Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6: (143 commits)
  USB: xhci depends on PCI.
  USB: xhci: Add Makefile, MAINTAINERS, and Kconfig entries.
  USB: xhci: Respect critical sections.
  USB: xHCI: Fix interrupt moderation.
  USB: xhci: Remove packed attribute from structures.
  usb; xhci: Fix TRB offset calculations.
  USB: xhci: replace if-elseif-else with switch-case
  USB: xhci: Make xhci-mem.c include linux/dmapool.h
  USB: xhci: drop spinlock in xhci_urb_enqueue() error path.
  USB: Change names of SuperSpeed ep companion descriptor structs.
  USB: xhci: Avoid compiler reordering in Link TRB giveback.
  USB: xhci: Clean up xhci_irq() function.
  USB: xhci: Avoid global namespace pollution.
  USB: xhci: Fix Link TRB handoff bit twiddling.
  USB: xhci: Fix register write order.
  USB: xhci: fix some compiler warnings in xhci.h
  USB: xhci: fix lots of compiler warnings.
  USB: xhci: use xhci_handle_event instead of handle_event
  USB: xhci: URB cancellation support.
  USB: xhci: Scatter gather list support for bulk transfers.
  ...

142 files changed, 19451 insertions, 1937 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 1a91bf9687af..07bbb9b3b93f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -24,6 +24,11 @@
 #include <asm/setup.h>
 #include "pci.h"
 
+const char *pci_power_names[] = {
+        "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown",
+};
+EXPORT_SYMBOL_GPL(pci_power_names);
+
 unsigned int pci_pm_d3_delay = PCI_PM_D3_WAIT;
 
 #ifdef CONFIG_PCI_DOMAINS
diff --git a/drivers/staging/uc2322/aten2011.c b/drivers/staging/uc2322/aten2011.c
index 9c62f787cc9c..39d0926d1a90 100644
--- a/drivers/staging/uc2322/aten2011.c
+++ b/drivers/staging/uc2322/aten2011.c
@@ -2336,7 +2336,7 @@ static int ATEN2011_startup(struct usb_serial *serial)
         return 0;
 }
 
-static void ATEN2011_shutdown(struct usb_serial *serial)
+static void ATEN2011_release(struct usb_serial *serial)
 {
         int i;
         struct ATENINTL_port *ATEN2011_port;
@@ -2382,7 +2382,7 @@ static struct usb_serial_driver aten_serial_driver = {
         .tiocmget =             ATEN2011_tiocmget,
         .tiocmset =             ATEN2011_tiocmset,
         .attach =               ATEN2011_startup,
-        .shutdown =             ATEN2011_shutdown,
+        .release =              ATEN2011_release,
         .read_bulk_callback =   ATEN2011_bulk_in_callback,
         .read_int_callback =    ATEN2011_interrupt_callback,
 };
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 5eee3f82be5d..dcd49f1e96d0 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -64,6 +64,7 @@ config USB_ARCH_HAS_EHCI
 config USB
         tristate "Support for Host-side USB"
         depends on USB_ARCH_HAS_HCD
+        select NLS  # for UTF-8 strings
         ---help---
           Universal Serial Bus (USB) is a specification for a serial bus
           subsystem which offers higher speeds and more features than the
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 0a3dc5ece634..19cb7d5480d7 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_USB_ISP116X_HCD)	+= host/
 obj-$(CONFIG_USB_OHCI_HCD)      += host/
 obj-$(CONFIG_USB_UHCI_HCD)      += host/
 obj-$(CONFIG_USB_FHCI_HCD)      += host/
+obj-$(CONFIG_USB_XHCI_HCD)      += host/
 obj-$(CONFIG_USB_SL811_HCD)     += host/
 obj-$(CONFIG_USB_U132_HCD)      += host/
 obj-$(CONFIG_USB_R8A66597_HCD)  += host/
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index ddeb69192537..38bfdb0f6660 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -937,9 +937,9 @@ static int acm_probe(struct usb_interface *intf,
         int buflen = intf->altsetting->extralen;
         struct usb_interface *control_interface;
         struct usb_interface *data_interface;
-        struct usb_endpoint_descriptor *epctrl;
-        struct usb_endpoint_descriptor *epread;
-        struct usb_endpoint_descriptor *epwrite;
+        struct usb_endpoint_descriptor *epctrl = NULL;
+        struct usb_endpoint_descriptor *epread = NULL;
+        struct usb_endpoint_descriptor *epwrite = NULL;
         struct usb_device *usb_dev = interface_to_usbdev(intf);
         struct acm *acm;
         int minor;
@@ -952,6 +952,7 @@ static int acm_probe(struct usb_interface *intf,
         unsigned long quirks;
         int num_rx_buf;
         int i;
+        int combined_interfaces = 0;
 
         /* normal quirks */
         quirks = (unsigned long)id->driver_info;
@@ -1033,9 +1034,15 @@ next_desc:
                         data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
                         control_interface = intf;
                 } else {
-                        dev_dbg(&intf->dev,
-                                        "No union descriptor, giving up\n");
-                        return -ENODEV;
+                        if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
+                                dev_dbg(&intf->dev,"No union descriptor, giving up\n");
+                                return -ENODEV;
+                        } else {
+                                dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
+                                combined_interfaces = 1;
+                                control_interface = data_interface = intf;
+                                goto look_for_collapsed_interface;
+                        }
                 }
         } else {
                 control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
@@ -1049,6 +1056,36 @@ next_desc:
         if (data_interface_num != call_interface_num)
                 dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
 
+        if (control_interface == data_interface) {
+                /* some broken devices designed for windows work this way */
+                dev_warn(&intf->dev,"Control and data interfaces are not separated!\n");
+                combined_interfaces = 1;
+                /* a popular other OS doesn't use it */
+                quirks |= NO_CAP_LINE;
+                if (data_interface->cur_altsetting->desc.bNumEndpoints != 3) {
+                        dev_err(&intf->dev, "This needs exactly 3 endpoints\n");
+                        return -EINVAL;
+                }
+look_for_collapsed_interface:
+                for (i = 0; i < 3; i++) {
+                        struct usb_endpoint_descriptor *ep;
+                        ep = &data_interface->cur_altsetting->endpoint[i].desc;
+
+                        if (usb_endpoint_is_int_in(ep))
+                                epctrl = ep;
+                        else if (usb_endpoint_is_bulk_out(ep))
+                                epwrite = ep;
+                        else if (usb_endpoint_is_bulk_in(ep))
+                                epread = ep;
+                        else
+                                return -EINVAL;
+                }
+                if (!epctrl || !epread || !epwrite)
+                        return -ENODEV;
+                else
+                        goto made_compressed_probe;
+        }
+
 skip_normal_probe:
 
         /*workaround for switched interfaces */
@@ -1068,10 +1105,11 @@ skip_normal_probe:
         }
 
         /* Accept probe requests only for the control interface */
-        if (intf != control_interface)
+        if (!combined_interfaces && intf != control_interface)
                 return -ENODEV;
 
-        if (usb_interface_claimed(data_interface)) { /* valid in this context */
+        if (!combined_interfaces && usb_interface_claimed(data_interface)) {
+                /* valid in this context */
                 dev_dbg(&intf->dev, "The data interface isn't available\n");
                 return -EBUSY;
         }
@@ -1095,6 +1133,7 @@ skip_normal_probe:
                 epread = epwrite;
                 epwrite = t;
         }
+made_compressed_probe:
         dbg("interfaces are valid");
         for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);
 
@@ -1112,12 +1151,15 @@ skip_normal_probe:
         ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
         readsize = le16_to_cpu(epread->wMaxPacketSize) *
                                 (quirks == SINGLE_RX_URB ? 1 : 2);
+        acm->combined_interfaces = combined_interfaces;
         acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize) * 20;
         acm->control = control_interface;
         acm->data = data_interface;
         acm->minor = minor;
         acm->dev = usb_dev;
         acm->ctrl_caps = ac_management_function;
+        if (quirks & NO_CAP_LINE)
+                acm->ctrl_caps &= ~USB_CDC_CAP_LINE;
         acm->ctrlsize = ctrlsize;
         acm->readsize = readsize;
         acm->rx_buflimit = num_rx_buf;
@@ -1223,9 +1265,10 @@ skip_normal_probe:
 
 skip_countries:
         usb_fill_int_urb(acm->ctrlurb, usb_dev,
-                        usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
-                        acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
-                        epctrl->bInterval);
+                         usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
+                         acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm,
+                         /* works around buggy devices */
+                         epctrl->bInterval ? epctrl->bInterval : 0xff);
         acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
         acm->ctrlurb->transfer_dma = acm->ctrl_dma;
 
@@ -1312,7 +1355,8 @@ static void acm_disconnect(struct usb_interface *intf)
                                                                 acm->ctrl_dma);
         acm_read_buffers_free(acm);
 
-        usb_driver_release_interface(&acm_driver, intf == acm->control ?
+        if (!acm->combined_interfaces)
+                usb_driver_release_interface(&acm_driver, intf == acm->control ?
                                         acm->data : acm->control);
 
         if (acm->port.count == 0) {
@@ -1451,6 +1495,9 @@ static struct usb_device_id acm_ids[] = {
                                            Maybe we should define a new
                                            quirk for this. */
         },
+        { USB_DEVICE(0x1bbb, 0x0003), /* Alcatel OT-I650 */
+        .driver_info = NO_UNION_NORMAL, /* reports zero length descriptor */
+        },
 
         /* control interfaces with various AT-command sets */
         { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
diff --git a/drivers/usb/class/cdc-acm.h b/drivers/usb/class/cdc-acm.h
index 4c3856420add..1602324808ba 100644
--- a/drivers/usb/class/cdc-acm.h
+++ b/drivers/usb/class/cdc-acm.h
@@ -125,6 +125,7 @@ struct acm {
         unsigned char clocal;                           /* termios CLOCAL */
         unsigned int ctrl_caps;                         /* control capabilities from the class specific header */
         unsigned int susp_count;                        /* number of suspended interfaces */
+        int combined_interfaces:1;                      /* control and data collapsed */
         struct acm_wb *delayed_wb;                      /* write queued for a device about to be woken */
 };
 
@@ -133,3 +134,4 @@ struct acm {
 /* constants describing various quirks and errors */
 #define NO_UNION_NORMAL                 1
 #define SINGLE_RX_URB                   2
+#define NO_CAP_LINE                     4
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index c40a9b284cc9..3703789d0d2a 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -927,21 +927,27 @@ static long usbtmc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
         switch (cmd) {
         case USBTMC_IOCTL_CLEAR_OUT_HALT:
                 retval = usbtmc_ioctl_clear_out_halt(data);
+                break;
 
         case USBTMC_IOCTL_CLEAR_IN_HALT:
                 retval = usbtmc_ioctl_clear_in_halt(data);
+                break;
 
         case USBTMC_IOCTL_INDICATOR_PULSE:
                 retval = usbtmc_ioctl_indicator_pulse(data);
+                break;
 
         case USBTMC_IOCTL_CLEAR:
                 retval = usbtmc_ioctl_clear(data);
+                break;
 
         case USBTMC_IOCTL_ABORT_BULK_OUT:
                 retval = usbtmc_ioctl_abort_bulk_out(data);
+                break;
 
         case USBTMC_IOCTL_ABORT_BULK_IN:
                 retval = usbtmc_ioctl_abort_bulk_in(data);
+                break;
         }
 
         mutex_unlock(&data->io_mutex);
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig
index e1759d17ac5d..69280c35b5cb 100644
--- a/drivers/usb/core/Kconfig
+++ b/drivers/usb/core/Kconfig
@@ -28,7 +28,7 @@ comment "Miscellaneous USB options"
         depends on USB
 
 config USB_DEVICEFS
-        bool "USB device filesystem"
+        bool "USB device filesystem (DEPRECATED)" if EMBEDDED
         depends on USB
         ---help---
           If you say Y here (and to "/proc file system support" in the "File
@@ -46,11 +46,15 @@ config USB_DEVICEFS
           For the format of the various /proc/bus/usb/ files, please read
           <file:Documentation/usb/proc_usb_info.txt>.
 
-          Usbfs files can't handle Access Control Lists (ACL), which are the
-          default way to grant access to USB devices for untrusted users of a
-          desktop system. The usbfs functionality is replaced by real
-          device-nodes managed by udev. These nodes live in /dev/bus/usb and
-          are used by libusb.
+          Modern Linux systems do not use this.
+
+          Usbfs entries are files and not character devices; usbfs can't
+          handle Access Control Lists (ACL) which are the default way to
+          grant access to USB devices for untrusted users of a desktop
+          system.
+
+          The usbfs functionality is replaced by real device-nodes managed by
+          udev.  These nodes lived in /dev/bus/usb and are used by libusb.
 
 config USB_DEVICE_CLASS
         bool "USB device class-devices (DEPRECATED)"
diff --git a/drivers/usb/core/Makefile b/drivers/usb/core/Makefile
index b6078706fb93..ec16e6029905 100644
--- a/drivers/usb/core/Makefile
+++ b/drivers/usb/core/Makefile
@@ -4,14 +4,14 @@
 
 usbcore-objs    := usb.o hub.o hcd.o urb.o message.o driver.o \
                         config.o file.o buffer.o sysfs.o endpoint.o \
-                        devio.o notify.o generic.o quirks.o
+                        devio.o notify.o generic.o quirks.o devices.o
 
 ifeq ($(CONFIG_PCI),y)
         usbcore-objs    += hcd-pci.o
 endif
 
 ifeq ($(CONFIG_USB_DEVICEFS),y)
-        usbcore-objs    += inode.o devices.o
+        usbcore-objs    += inode.o
 endif
 
 obj-$(CONFIG_USB)       += usbcore.o
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 568244c99bdc..24dfb33f90cb 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -19,6 +19,32 @@ static inline const char *plural(int n)
         return (n == 1 ? "" : "s");
 }
 
+/* FIXME: this is a kludge */
+static int find_next_descriptor_more(unsigned char *buffer, int size,
+    int dt1, int dt2, int dt3, int *num_skipped)
+{
+        struct usb_descriptor_header *h;
+        int n = 0;
+        unsigned char *buffer0 = buffer;
+
+        /* Find the next descriptor of type dt1 or dt2 or dt3 */
+        while (size > 0) {
+                h = (struct usb_descriptor_header *) buffer;
+                if (h->bDescriptorType == dt1 || h->bDescriptorType == dt2 ||
+                                h->bDescriptorType == dt3)
+                        break;
+                buffer += h->bLength;
+                size -= h->bLength;
+                ++n;
+        }
+
+        /* Store the number of descriptors skipped and return the
+         * number of bytes skipped */
+        if (num_skipped)
+                *num_skipped = n;
+        return buffer - buffer0;
+}
+
 static int find_next_descriptor(unsigned char *buffer, int size,
     int dt1, int dt2, int *num_skipped)
 {
@@ -43,6 +69,129 @@ static int find_next_descriptor(unsigned char *buffer, int size,
         return buffer - buffer0;
 }
 
+static int usb_parse_ss_endpoint_companion(struct device *ddev, int cfgno,
+                int inum, int asnum, struct usb_host_endpoint *ep,
+                int num_ep, unsigned char *buffer, int size)
+{
+        unsigned char *buffer_start = buffer;
+        struct usb_ss_ep_comp_descriptor        *desc;
+        int retval;
+        int num_skipped;
+        int max_tx;
+        int i;
+
+        /* Allocate space for the SS endpoint companion descriptor */
+        ep->ss_ep_comp = kzalloc(sizeof(struct usb_host_ss_ep_comp),
+                        GFP_KERNEL);
+        if (!ep->ss_ep_comp)
+                return -ENOMEM;
+        desc = (struct usb_ss_ep_comp_descriptor *) buffer;
+        if (desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP) {
+                dev_warn(ddev, "No SuperSpeed endpoint companion for config %d "
+                                " interface %d altsetting %d ep %d: "
+                                "using minimum values\n",
+                                cfgno, inum, asnum, ep->desc.bEndpointAddress);
+                ep->ss_ep_comp->desc.bLength = USB_DT_SS_EP_COMP_SIZE;
+                ep->ss_ep_comp->desc.bDescriptorType = USB_DT_SS_ENDPOINT_COMP;
+                ep->ss_ep_comp->desc.bMaxBurst = 0;
+                /*
+                 * Leave bmAttributes as zero, which will mean no streams for
+                 * bulk, and isoc won't support multiple bursts of packets.
+                 * With bursts of only one packet, and a Mult of 1, the max
+                 * amount of data moved per endpoint service interval is one
+                 * packet.
+                 */
+                if (usb_endpoint_xfer_isoc(&ep->desc) ||
+                                usb_endpoint_xfer_int(&ep->desc))
+                        ep->ss_ep_comp->desc.wBytesPerInterval =
+                                ep->desc.wMaxPacketSize;
+                /*
+                 * The next descriptor is for an Endpoint or Interface,
+                 * no extra descriptors to copy into the companion structure,
+                 * and we didn't eat up any of the buffer.
+                 */
+                retval = 0;
+                goto valid;
+        }
+        memcpy(&ep->ss_ep_comp->desc, desc, USB_DT_SS_EP_COMP_SIZE);
+        desc = &ep->ss_ep_comp->desc;
+        buffer += desc->bLength;
+        size -= desc->bLength;
+
+        /* Eat up the other descriptors we don't care about */
+        ep->ss_ep_comp->extra = buffer;
+        i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
+                        USB_DT_INTERFACE, &num_skipped);
+        ep->ss_ep_comp->extralen = i;
+        buffer += i;
+        size -= i;
+        retval = buffer - buffer_start + i;
+        if (num_skipped > 0)
+                dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
+                                num_skipped, plural(num_skipped),
+                                "SuperSpeed endpoint companion");
+
+        /* Check the various values */
+        if (usb_endpoint_xfer_control(&ep->desc) && desc->bMaxBurst != 0) {
+                dev_warn(ddev, "Control endpoint with bMaxBurst = %d in "
+                                "config %d interface %d altsetting %d ep %d: "
+                                "setting to zero\n", desc->bMaxBurst,
+                                cfgno, inum, asnum, ep->desc.bEndpointAddress);
+                desc->bMaxBurst = 0;
+        }
+        if (desc->bMaxBurst > 15) {
+                dev_warn(ddev, "Endpoint with bMaxBurst = %d in "
+                                "config %d interface %d altsetting %d ep %d: "
+                                "setting to 15\n", desc->bMaxBurst,
+                                cfgno, inum, asnum, ep->desc.bEndpointAddress);
+                desc->bMaxBurst = 15;
+        }
+        if ((usb_endpoint_xfer_control(&ep->desc) || usb_endpoint_xfer_int(&ep->desc))
+                        && desc->bmAttributes != 0) {
+                dev_warn(ddev, "%s endpoint with bmAttributes = %d in "
+                                "config %d interface %d altsetting %d ep %d: "
+                                "setting to zero\n",
+                                usb_endpoint_xfer_control(&ep->desc) ? "Control" : "Bulk",
+                                desc->bmAttributes,
+                                cfgno, inum, asnum, ep->desc.bEndpointAddress);
+                desc->bmAttributes = 0;
+        }
+        if (usb_endpoint_xfer_bulk(&ep->desc) && desc->bmAttributes > 16) {
+                dev_warn(ddev, "Bulk endpoint with more than 65536 streams in "
+                                "config %d interface %d altsetting %d ep %d: "
+                                "setting to max\n",
+                                cfgno, inum, asnum, ep->desc.bEndpointAddress);
+                desc->bmAttributes = 16;
+        }
+        if (usb_endpoint_xfer_isoc(&ep->desc) && desc->bmAttributes > 2) {
+                dev_warn(ddev, "Isoc endpoint has Mult of %d in "
+                                "config %d interface %d altsetting %d ep %d: "
+                                "setting to 3\n", desc->bmAttributes + 1,
+                                cfgno, inum, asnum, ep->desc.bEndpointAddress);
+                desc->bmAttributes = 2;
+        }
+        if (usb_endpoint_xfer_isoc(&ep->desc)) {
+                max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1) *
+                        (desc->bmAttributes + 1);
+        } else if (usb_endpoint_xfer_int(&ep->desc)) {
+                max_tx = ep->desc.wMaxPacketSize * (desc->bMaxBurst + 1);
+        } else {
+                goto valid;
+        }
+        if (desc->wBytesPerInterval > max_tx) {
+                dev_warn(ddev, "%s endpoint with wBytesPerInterval of %d in "
+                                "config %d interface %d altsetting %d ep %d: "
+                                "setting to %d\n",
+                                usb_endpoint_xfer_isoc(&ep->desc) ? "Isoc" : "Int",
+                                desc->wBytesPerInterval,
+                                cfgno, inum, asnum, ep->desc.bEndpointAddress,
+                                max_tx);
+                desc->wBytesPerInterval = max_tx;
+        }
+valid:
+        return retval;
+}
+
 static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
     int asnum, struct usb_host_interface *ifp, int num_ep,
     unsigned char *buffer, int size)
@@ -50,7 +199,7 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
         unsigned char *buffer0 = buffer;
         struct usb_endpoint_descriptor *d;
         struct usb_host_endpoint *endpoint;
-        int n, i, j;
+        int n, i, j, retval;
 
         d = (struct usb_endpoint_descriptor *) buffer;
         buffer += d->bLength;
@@ -92,6 +241,7 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
         if (usb_endpoint_xfer_int(d)) {
                 i = 1;
                 switch (to_usb_device(ddev)->speed) {
+                case USB_SPEED_SUPER:
                 case USB_SPEED_HIGH:
                         /* Many device manufacturers are using full-speed
                          * bInterval values in high-speed interrupt endpoint
@@ -161,17 +311,39 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
                                 cfgno, inum, asnum, d->bEndpointAddress,
                                 maxp);
         }
-
-        /* Skip over any Class Specific or Vendor Specific descriptors;
-         * find the next endpoint or interface descriptor */
-        endpoint->extra = buffer;
-        i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
-            USB_DT_INTERFACE, &n);
-        endpoint->extralen = i;
+        /* Allocate room for and parse any SS endpoint companion descriptors */
+        if (to_usb_device(ddev)->speed == USB_SPEED_SUPER) {
+                endpoint->extra = buffer;
+                i = find_next_descriptor_more(buffer, size, USB_DT_SS_ENDPOINT_COMP,
+                                USB_DT_ENDPOINT, USB_DT_INTERFACE, &n);
+                endpoint->extralen = i;
+                buffer += i;
+                size -= i;
+
+                if (size > 0) {
+                        retval = usb_parse_ss_endpoint_companion(ddev, cfgno,
+                                        inum, asnum, endpoint, num_ep, buffer,
+                                        size);
+                        if (retval >= 0) {
+                                buffer += retval;
+                                retval = buffer - buffer0;
+                        }
+                } else {
+                        retval = buffer - buffer0;
+                }
+        } else {
+                /* Skip over any Class Specific or Vendor Specific descriptors;
+                 * find the next endpoint or interface descriptor */
+                endpoint->extra = buffer;
+                i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
+                                USB_DT_INTERFACE, &n);
+                endpoint->extralen = i;
+                retval = buffer - buffer0 + i;
+        }
         if (n > 0)
                 dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
                     n, plural(n), "endpoint");
-        return buffer - buffer0 + i;
+        return retval;
 
 skip_to_next_endpoint_or_interface_descriptor:
         i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
@@ -452,6 +624,8 @@ static int usb_parse_configuration(struct device *ddev, int cfgidx,
                 kref_init(&intfc->ref);
         }
 
+        /* FIXME: parse the BOS descriptor */
+
         /* Skip over any Class Specific or Vendor Specific descriptors;
          * find the first interface descriptor */
         config->extra = buffer;
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index d0a21a5f8201..69e5773abfce 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -154,16 +154,11 @@ static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *in
 static int usb_probe_device(struct device *dev)
 {
         struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
-        struct usb_device *udev;
+        struct usb_device *udev = to_usb_device(dev);
         int error = -ENODEV;
 
         dev_dbg(dev, "%s\n", __func__);
 
-        if (!is_usb_device(dev))        /* Sanity check */
-                return error;
-
-        udev = to_usb_device(dev);
-
         /* TODO: Add real matching code */
 
         /* The device should always appear to be in use
@@ -203,18 +198,13 @@ static void usb_cancel_queued_reset(struct usb_interface *iface)
 static int usb_probe_interface(struct device *dev)
 {
         struct usb_driver *driver = to_usb_driver(dev->driver);
-        struct usb_interface *intf;
-        struct usb_device *udev;
+        struct usb_interface *intf = to_usb_interface(dev);
+        struct usb_device *udev = interface_to_usbdev(intf);
         const struct usb_device_id *id;
         int error = -ENODEV;
 
         dev_dbg(dev, "%s\n", __func__);
 
-        if (is_usb_device(dev))         /* Sanity check */
-                return error;
-
-        intf = to_usb_interface(dev);
-        udev = interface_to_usbdev(intf);
         intf->needs_binding = 0;
 
         if (udev->authorized == 0) {
@@ -385,7 +375,6 @@ void usb_driver_release_interface(struct usb_driver *driver,
                                         struct usb_interface *iface)
 {
         struct device *dev = &iface->dev;
-        struct usb_device *udev = interface_to_usbdev(iface);
 
         /* this should never happen, don't release something that's not ours */
         if (!dev->driver || dev->driver != &driver->drvwrap.driver)
@@ -394,23 +383,19 @@ void usb_driver_release_interface(struct usb_driver *driver,
         /* don't release from within disconnect() */
         if (iface->condition != USB_INTERFACE_BOUND)
                 return;
+        iface->condition = USB_INTERFACE_UNBINDING;
 
-        /* don't release if the interface hasn't been added yet */
+        /* Release via the driver core only if the interface
+         * has already been registered
+         */
         if (device_is_registered(dev)) {
-                iface->condition = USB_INTERFACE_UNBINDING;
                 device_release_driver(dev);
         } else {
-                iface->condition = USB_INTERFACE_UNBOUND;
-                usb_cancel_queued_reset(iface);
+                down(&dev->sem);
+                usb_unbind_interface(dev);
+                dev->driver = NULL;
+                up(&dev->sem);
         }
-        dev->driver = NULL;
-        usb_set_intfdata(iface, NULL);
-
-        usb_pm_lock(udev);
-        iface->condition = USB_INTERFACE_UNBOUND;
-        mark_quiesced(iface);
-        iface->needs_remote_wakeup = 0;
-        usb_pm_unlock(udev);
 }
 EXPORT_SYMBOL_GPL(usb_driver_release_interface);
 
@@ -598,7 +583,7 @@ static int usb_device_match(struct device *dev, struct device_driver *drv)
                 /* TODO: Add real matching code */
                 return 1;
 
-        } else {
+        } else if (is_usb_interface(dev)) {
                 struct usb_interface *intf;
                 struct usb_driver *usb_drv;
                 const struct usb_device_id *id;
@@ -630,11 +615,14 @@ static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
         /* driver is often null here; dev_dbg() would oops */
         pr_debug("usb %s: uevent\n", dev_name(dev));
 
-        if (is_usb_device(dev))
+        if (is_usb_device(dev)) {
                 usb_dev = to_usb_device(dev);
-        else {
+        } else if (is_usb_interface(dev)) {
                 struct usb_interface *intf = to_usb_interface(dev);
+
                 usb_dev = interface_to_usbdev(intf);
+        } else {
+                return 0;
         }
 
         if (usb_dev->devnum < 0) {
@@ -1762,6 +1750,7 @@ int usb_suspend(struct device *dev, pm_message_t msg)
 int usb_resume(struct device *dev, pm_message_t msg)
 {
         struct usb_device       *udev;
+        int                     status;
 
         udev = to_usb_device(dev);
 
@@ -1771,7 +1760,14 @@ int usb_resume(struct device *dev, pm_message_t msg)
          */
         if (udev->skip_sys_resume)
                 return 0;
-        return usb_external_resume_device(udev, msg);
+        status = usb_external_resume_device(udev, msg);
+
+        /* Avoid PM error messages for devices disconnected while suspended
+         * as we'll display regular disconnect messages just a bit later.
+         */
+        if (status == -ENODEV)
+                return 0;
+        return status;
 }
 
 #endif /* CONFIG_PM */
diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
index 40dee2ac0133..bc39fc40bbde 100644
--- a/drivers/usb/core/endpoint.c
+++ b/drivers/usb/core/endpoint.c
@@ -15,19 +15,18 @@
 #include <linux/usb.h>
 #include "usb.h"
 
-#define MAX_ENDPOINT_MINORS (64*128*32)
-static int usb_endpoint_major;
-static DEFINE_IDR(endpoint_idr);
-
 struct ep_device {
         struct usb_endpoint_descriptor *desc;
         struct usb_device *udev;
         struct device dev;
-        int minor;
 };
 #define to_ep_device(_dev) \
         container_of(_dev, struct ep_device, dev)
 
+struct device_type usb_ep_device_type = {
+        .name =         "usb_endpoint",
+};
+
 struct ep_attribute {
         struct attribute attr;
         ssize_t (*show)(struct usb_device *,
@@ -160,118 +159,10 @@ static struct attribute_group *ep_dev_groups[] = {
         NULL
 };
 
-static int usb_endpoint_major_init(void)
-{
-        dev_t dev;
-        int error;
-
-        error = alloc_chrdev_region(&dev, 0, MAX_ENDPOINT_MINORS,
-                                    "usb_endpoint");
-        if (error) {
-                printk(KERN_ERR "Unable to get a dynamic major for "
-                       "usb endpoints.\n");
-                return error;
-        }
-        usb_endpoint_major = MAJOR(dev);
-
-        return error;
-}
-
-static void usb_endpoint_major_cleanup(void)
-{
-        unregister_chrdev_region(MKDEV(usb_endpoint_major, 0),
-                                 MAX_ENDPOINT_MINORS);
-}
-
-static int endpoint_get_minor(struct ep_device *ep_dev)
-{
-        static DEFINE_MUTEX(minor_lock);
-        int retval = -ENOMEM;
-        int id;
-
-        mutex_lock(&minor_lock);
-        if (idr_pre_get(&endpoint_idr, GFP_KERNEL) == 0)
-                goto exit;
-
-        retval = idr_get_new(&endpoint_idr, ep_dev, &id);
-        if (retval < 0) {
-                if (retval == -EAGAIN)
-                        retval = -ENOMEM;
-                goto exit;
-        }
-        ep_dev->minor = id & MAX_ID_MASK;
-exit:
-        mutex_unlock(&minor_lock);
-        return retval;
-}
-
-static void endpoint_free_minor(struct ep_device *ep_dev)
-{
-        idr_remove(&endpoint_idr, ep_dev->minor);
-}
-
-static struct endpoint_class {
-        struct kref kref;
-        struct class *class;
-} *ep_class;
-
-static int init_endpoint_class(void)
-{
-        int result = 0;
-
-        if (ep_class != NULL) {
-                kref_get(&ep_class->kref);
-                goto exit;
-        }
-
-        ep_class = kmalloc(sizeof(*ep_class), GFP_KERNEL);
-        if (!ep_class) {
-                result = -ENOMEM;
-                goto exit;
-        }
-
-        kref_init(&ep_class->kref);
-        ep_class->class = class_create(THIS_MODULE, "usb_endpoint");
-        if (IS_ERR(ep_class->class)) {
-                result = PTR_ERR(ep_class->class);
-                goto class_create_error;
-        }
-
-        result = usb_endpoint_major_init();
-        if (result)
-                goto endpoint_major_error;
-
-        goto exit;
-
-endpoint_major_error:
-        class_destroy(ep_class->class);
-class_create_error:
-        kfree(ep_class);
-        ep_class = NULL;
-exit:
-        return result;
-}
-
-static void release_endpoint_class(struct kref *kref)
-{
-        /* Ok, we cheat as we know we only have one ep_class */
-        class_destroy(ep_class->class);
-        kfree(ep_class);
-        ep_class = NULL;
-        usb_endpoint_major_cleanup();
-}
-
-static void destroy_endpoint_class(void)
-{
-        if (ep_class)
-                kref_put(&ep_class->kref, release_endpoint_class);
-}
-
 static void ep_device_release(struct device *dev)
 {
         struct ep_device *ep_dev = to_ep_device(dev);
 
-        endpoint_free_minor(ep_dev);
         kfree(ep_dev);
 }
 
@@ -279,62 +170,32 @@ int usb_create_ep_devs(struct device *parent,
                         struct usb_host_endpoint *endpoint,
                         struct usb_device *udev)
 {
-        char name[8];
         struct ep_device *ep_dev;
         int retval;
 
-        retval = init_endpoint_class();
-        if (retval)
-                goto exit;
-
         ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
         if (!ep_dev) {
                 retval = -ENOMEM;
-                goto error_alloc;
-        }
-
-        retval = endpoint_get_minor(ep_dev);
-        if (retval) {
-                dev_err(parent, "can not allocate minor number for %s\n",
-                        dev_name(&ep_dev->dev));
-                goto error_register;
+                goto exit;
         }
 
         ep_dev->desc = &endpoint->desc;
         ep_dev->udev = udev;
         ep_dev->dev.groups = ep_dev_groups;
-        ep_dev->dev.devt = MKDEV(usb_endpoint_major, ep_dev->minor);
-        ep_dev->dev.class = ep_class->class;
+        ep_dev->dev.type = &usb_ep_device_type;
         ep_dev->dev.parent = parent;
         ep_dev->dev.release = ep_device_release;
-        dev_set_name(&ep_dev->dev, "usbdev%d.%d_ep%02x",
-                 udev->bus->busnum, udev->devnum,
-                 endpoint->desc.bEndpointAddress);
+        dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress);
 
         retval = device_register(&ep_dev->dev);
         if (retval)
-                goto error_chrdev;
+                goto error_register;
 
-        /* create the symlink to the old-style "ep_XX" directory */
-        sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
-        retval = sysfs_create_link(&parent->kobj, &ep_dev->dev.kobj, name);
-        if (retval)
-                goto error_link;
         endpoint->ep_dev = ep_dev;
         return retval;
 
-error_link:
-        device_unregister(&ep_dev->dev);
-        destroy_endpoint_class();
-        return retval;
-
-error_chrdev:
-        endpoint_free_minor(ep_dev);
-
 error_register:
         kfree(ep_dev);
-error_alloc:
-        destroy_endpoint_class();
 exit:
         return retval;
 }
@@ -344,12 +205,7 @@ void usb_remove_ep_devs(struct usb_host_endpoint *endpoint)
         struct ep_device *ep_dev = endpoint->ep_dev;
 
         if (ep_dev) {
-                char name[8];
-
-                sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
-                sysfs_remove_link(&ep_dev->dev.parent->kobj, name);
                 device_unregister(&ep_dev->dev);
                 endpoint->ep_dev = NULL;
-                destroy_endpoint_class();
         }
 }
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index a4301dc02d27..91f2885b6ee1 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -185,194 +185,198 @@ void usb_hcd_pci_remove(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
 
-
-#ifdef  CONFIG_PM
-
 /**
- * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
- * @dev: USB Host Controller being suspended
- * @message: Power Management message describing this state transition
- *
- * Store this function in the HCD's struct pci_driver as .suspend.
+ * usb_hcd_pci_shutdown - shutdown host controller
+ * @dev: USB Host Controller being shutdown
  */
-int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
+void usb_hcd_pci_shutdown(struct pci_dev *dev)
+{
+        struct usb_hcd          *hcd;
+
+        hcd = pci_get_drvdata(dev);
+        if (!hcd)
+                return;
+
+        if (hcd->driver->shutdown)
+                hcd->driver->shutdown(hcd);
+}
+EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
+
+#ifdef  CONFIG_PM_SLEEP
+
+static int check_root_hub_suspended(struct device *dev)
+{
+        struct pci_dev          *pci_dev = to_pci_dev(dev);
+        struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
+
+        if (!(hcd->state == HC_STATE_SUSPENDED ||
+                        hcd->state == HC_STATE_HALT)) {
+                dev_warn(dev, "Root hub is not suspended\n");
+                return -EBUSY;
+        }
+        return 0;
+}
+
+static int hcd_pci_suspend(struct device *dev)
 {
-        struct usb_hcd          *hcd = pci_get_drvdata(dev);
-        int                     retval = 0;
-        int                     wake, w;
-        int                     has_pci_pm;
+        struct pci_dev          *pci_dev = to_pci_dev(dev);
+        struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
+        int                     retval;
 
         /* Root hub suspend should have stopped all downstream traffic,
          * and all bus master traffic.  And done so for both the interface
          * and the stub usb_device (which we check here).  But maybe it
          * didn't; writing sysfs power/state files ignores such rules...
-         *
-         * We must ignore the FREEZE vs SUSPEND distinction here, because
-         * otherwise the swsusp will save (and restore) garbage state.
          */
-        if (!(hcd->state == HC_STATE_SUSPENDED ||
-                        hcd->state == HC_STATE_HALT)) {
-                dev_warn(&dev->dev, "Root hub is not suspended\n");
-                retval = -EBUSY;
-                goto done;
-        }
+        retval = check_root_hub_suspended(dev);
+        if (retval)
+                return retval;
 
         /* We might already be suspended (runtime PM -- not yet written) */
-        if (dev->current_state != PCI_D0)
-                goto done;
+        if (pci_dev->current_state != PCI_D0)
+                return retval;
 
         if (hcd->driver->pci_suspend) {
-                retval = hcd->driver->pci_suspend(hcd, message);
+                retval = hcd->driver->pci_suspend(hcd);
                 suspend_report_result(hcd->driver->pci_suspend, retval);
                 if (retval)
-                        goto done;
+                        return retval;
         }
 
-        synchronize_irq(dev->irq);
+        synchronize_irq(pci_dev->irq);
 
         /* Downstream ports from this root hub should already be quiesced, so
          * there will be no DMA activity.  Now we can shut down the upstream
-         * link (except maybe for PME# resume signaling) and enter some PCI
-         * low power state, if the hardware allows.
+         * link (except maybe for PME# resume signaling).  We'll enter a
+         * low power state during suspend_noirq, if the hardware allows.
          */
-        pci_disable_device(dev);
+        pci_disable_device(pci_dev);
+        return retval;
+}
+
+static int hcd_pci_suspend_noirq(struct device *dev)
+{
+        struct pci_dev          *pci_dev = to_pci_dev(dev);
+        struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
+        int                     retval;
+
+        retval = check_root_hub_suspended(dev);
+        if (retval)
+                return retval;
 
-        pci_save_state(dev);
+        pci_save_state(pci_dev);
 
-        /* Don't fail on error to enable wakeup.  We rely on pci code
-         * to reject requests the hardware can't implement, rather
-         * than coding the same thing.
+        /* If the root hub is HALTed rather than SUSPENDed,
+         * disallow remote wakeup.
          */
-        wake = (hcd->state == HC_STATE_SUSPENDED &&
-                        device_may_wakeup(&dev->dev));
-        w = pci_wake_from_d3(dev, wake);
-        if (w < 0)
-                wake = w;
-        dev_dbg(&dev->dev, "wakeup: %d\n", wake);
-
-        /* Don't change state if we don't need to */
-        if (message.event == PM_EVENT_FREEZE ||
-                        message.event == PM_EVENT_PRETHAW) {
-                dev_dbg(&dev->dev, "--> no state change\n");
-                goto done;
-        }
+        if (hcd->state == HC_STATE_HALT)
+                device_set_wakeup_enable(dev, 0);
+        dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
 
-        has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
-        if (!has_pci_pm) {
-                dev_dbg(&dev->dev, "--> PCI D0 legacy\n");
+        /* Possibly enable remote wakeup,
+         * choose the appropriate low-power state, and go to that state.
+         */
+        retval = pci_prepare_to_sleep(pci_dev);
+        if (retval == -EIO) {           /* Low-power not supported */
+                dev_dbg(dev, "--> PCI D0 legacy\n");
+                retval = 0;
+        } else if (retval == 0) {
+                dev_dbg(dev, "--> PCI %s\n",
+                                pci_power_name(pci_dev->current_state));
         } else {
-
-                /* NOTE:  dev->current_state becomes nonzero only here, and
-                 * only for devices that support PCI PM.  Also, exiting
-                 * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
-                 * some device state (e.g. as part of clock reinit).
-                 */
-                retval = pci_set_power_state(dev, PCI_D3hot);
-                suspend_report_result(pci_set_power_state, retval);
-                if (retval == 0) {
-                        dev_dbg(&dev->dev, "--> PCI D3\n");
-                } else {
-                        dev_dbg(&dev->dev, "PCI D3 suspend fail, %d\n",
-                                        retval);
-                        pci_restore_state(dev);
-                }
+                suspend_report_result(pci_prepare_to_sleep, retval);
+                return retval;
         }
 
 #ifdef CONFIG_PPC_PMAC
-        if (retval == 0) {
-                /* Disable ASIC clocks for USB */
-                if (machine_is(powermac)) {
-                        struct device_node      *of_node;
-
-                        of_node = pci_device_to_OF_node(dev);
-                        if (of_node)
-                                pmac_call_feature(PMAC_FTR_USB_ENABLE,
-                                                        of_node, 0, 0);
-                }
+        /* Disable ASIC clocks for USB */
+        if (machine_is(powermac)) {
+                struct device_node      *of_node;
+
+                of_node = pci_device_to_OF_node(pci_dev);
+                if (of_node)
+                        pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 0);
         }
 #endif
-
- done:
         return retval;
 }
-EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
 
-/**
- * usb_hcd_pci_resume - power management resume of a PCI-based HCD
- * @dev: USB Host Controller being resumed
- *
- * Store this function in the HCD's struct pci_driver as .resume.
- */
-int usb_hcd_pci_resume(struct pci_dev *dev)
+static int hcd_pci_resume_noirq(struct device *dev)
 {
-        struct usb_hcd          *hcd;
-        int                     retval;
+        struct pci_dev          *pci_dev = to_pci_dev(dev);
 
 #ifdef CONFIG_PPC_PMAC
         /* Reenable ASIC clocks for USB */
         if (machine_is(powermac)) {
                 struct device_node *of_node;
 
-                of_node = pci_device_to_OF_node(dev);
+                of_node = pci_device_to_OF_node(pci_dev);
                 if (of_node)
                         pmac_call_feature(PMAC_FTR_USB_ENABLE,
                                                 of_node, 0, 1);
         }
 #endif
 
-        pci_restore_state(dev);
+        /* Go back to D0 and disable remote wakeup */
+        pci_back_from_sleep(pci_dev);
+        return 0;
+}
+
+static int resume_common(struct device *dev, bool hibernated)
+{
+        struct pci_dev          *pci_dev = to_pci_dev(dev);
+        struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
+        int                     retval;
 
-        hcd = pci_get_drvdata(dev);
         if (hcd->state != HC_STATE_SUSPENDED) {
-                dev_dbg(hcd->self.controller,
-                                "can't resume, not suspended!\n");
+                dev_dbg(dev, "can't resume, not suspended!\n");
                 return 0;
         }
 
-        pci_enable_wake(dev, PCI_D0, false);
-
-        retval = pci_enable_device(dev);
+        retval = pci_enable_device(pci_dev);
         if (retval < 0) {
-                dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
-                                retval);
+                dev_err(dev, "can't re-enable after resume, %d!\n", retval);
                 return retval;
         }
 
-        pci_set_master(dev);
-
-        /* yes, ignore this result too... */
-        (void) pci_wake_from_d3(dev, 0);
+        pci_set_master(pci_dev);
 
         clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
 
         if (hcd->driver->pci_resume) {
-                retval = hcd->driver->pci_resume(hcd);
+                retval = hcd->driver->pci_resume(hcd, hibernated);
                 if (retval) {
-                        dev_err(hcd->self.controller,
-                                "PCI post-resume error %d!\n", retval);
+                        dev_err(dev, "PCI post-resume error %d!\n", retval);
                         usb_hc_died(hcd);
                 }
         }
         return retval;
 }
-EXPORT_SYMBOL_GPL(usb_hcd_pci_resume);
 
-#endif  /* CONFIG_PM */
-
-/**
- * usb_hcd_pci_shutdown - shutdown host controller
- * @dev: USB Host Controller being shutdown
- */
-void usb_hcd_pci_shutdown(struct pci_dev *dev)
+static int hcd_pci_resume(struct device *dev)
 {
-        struct usb_hcd          *hcd;
-
-        hcd = pci_get_drvdata(dev);
-        if (!hcd)
-                return;
+        return resume_common(dev, false);
+}
 
-        if (hcd->driver->shutdown)
-                hcd->driver->shutdown(hcd);
+static int hcd_pci_restore(struct device *dev)
+{
+        return resume_common(dev, true);
 }
-EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
 
+struct dev_pm_ops usb_hcd_pci_pm_ops = {
+        .suspend        = hcd_pci_suspend,
+        .suspend_noirq  = hcd_pci_suspend_noirq,
+        .resume_noirq   = hcd_pci_resume_noirq,
+        .resume         = hcd_pci_resume,
+        .freeze         = check_root_hub_suspended,
+        .freeze_noirq   = check_root_hub_suspended,
+        .thaw_noirq     = NULL,
+        .thaw           = NULL,
+        .poweroff       = hcd_pci_suspend,
+        .poweroff_noirq = hcd_pci_suspend_noirq,
+        .restore_noirq  = hcd_pci_resume_noirq,
+        .restore        = hcd_pci_restore,
+};
+EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
+
+#endif  /* CONFIG_PM_SLEEP */
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 42b93da1085d..ce3f453f02ef 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -128,6 +128,27 @@ static inline int is_root_hub(struct usb_device *udev)
 #define KERNEL_REL      ((LINUX_VERSION_CODE >> 16) & 0x0ff)
 #define KERNEL_VER      ((LINUX_VERSION_CODE >> 8) & 0x0ff)
 
+/* usb 3.0 root hub device descriptor */
+static const u8 usb3_rh_dev_descriptor[18] = {
+        0x12,       /*  __u8  bLength; */
+        0x01,       /*  __u8  bDescriptorType; Device */
+        0x00, 0x03, /*  __le16 bcdUSB; v3.0 */
+
+        0x09,       /*  __u8  bDeviceClass; HUB_CLASSCODE */
+        0x00,       /*  __u8  bDeviceSubClass; */
+        0x03,       /*  __u8  bDeviceProtocol; USB 3.0 hub */
+        0x09,       /*  __u8  bMaxPacketSize0; 2^9 = 512 Bytes */
+
+        0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation */
+        0x02, 0x00, /*  __le16 idProduct; device 0x0002 */
+        KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */
+
+        0x03,       /*  __u8  iManufacturer; */
+        0x02,       /*  __u8  iProduct; */
+        0x01,       /*  __u8  iSerialNumber; */
+        0x01        /*  __u8  bNumConfigurations; */
+};
+
 /* usb 2.0 root hub device descriptor */
 static const u8 usb2_rh_dev_descriptor [18] = {
         0x12,       /*  __u8  bLength; */
@@ -273,6 +294,47 @@ static const u8 hs_rh_config_descriptor [] = {
         0x0c        /*  __u8  ep_bInterval; (256ms -- usb 2.0 spec) */
 };
 
+static const u8 ss_rh_config_descriptor[] = {
+        /* one configuration */
+        0x09,       /*  __u8  bLength; */
+        0x02,       /*  __u8  bDescriptorType; Configuration */
+        0x19, 0x00, /*  __le16 wTotalLength; FIXME */
+        0x01,       /*  __u8  bNumInterfaces; (1) */
+        0x01,       /*  __u8  bConfigurationValue; */
+        0x00,       /*  __u8  iConfiguration; */
+        0xc0,       /*  __u8  bmAttributes;
+                                 Bit 7: must be set,
+                                     6: Self-powered,
+                                     5: Remote wakeup,
+                                     4..0: resvd */
+        0x00,       /*  __u8  MaxPower; */
+
+        /* one interface */
+        0x09,       /*  __u8  if_bLength; */
+        0x04,       /*  __u8  if_bDescriptorType; Interface */
+        0x00,       /*  __u8  if_bInterfaceNumber; */
+        0x00,       /*  __u8  if_bAlternateSetting; */
+        0x01,       /*  __u8  if_bNumEndpoints; */
+        0x09,       /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
+        0x00,       /*  __u8  if_bInterfaceSubClass; */
+        0x00,       /*  __u8  if_bInterfaceProtocol; */
+        0x00,       /*  __u8  if_iInterface; */
+
+        /* one endpoint (status change endpoint) */
+        0x07,       /*  __u8  ep_bLength; */
+        0x05,       /*  __u8  ep_bDescriptorType; Endpoint */
+        0x81,       /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
+        0x03,       /*  __u8  ep_bmAttributes; Interrupt */
+                    /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
+                     * see hub.c:hub_configure() for details. */
+        (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
+        0x0c        /*  __u8  ep_bInterval; (256ms -- usb 2.0 spec) */
+        /*
+         * All 3.0 hubs should have an endpoint companion descriptor,
+         * but we're ignoring that for now.  FIXME?
+         */
+};
+
 /*-------------------------------------------------------------------------*/
 
 /*
@@ -426,23 +488,39 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
                 switch (wValue & 0xff00) {
                 case USB_DT_DEVICE << 8:
-                        if (hcd->driver->flags & HCD_USB2)
+                        switch (hcd->driver->flags & HCD_MASK) {
+                        case HCD_USB3:
+                                bufp = usb3_rh_dev_descriptor;
+                                break;
+                        case HCD_USB2:
                                 bufp = usb2_rh_dev_descriptor;
-                        else if (hcd->driver->flags & HCD_USB11)
+                                break;
+                        case HCD_USB11:
                                 bufp = usb11_rh_dev_descriptor;
-                        else
+                                break;
+                        default:
                                 goto error;
+                        }
                         len = 18;
                         if (hcd->has_tt)
                                 patch_protocol = 1;
                         break;
                 case USB_DT_CONFIG << 8:
-                        if (hcd->driver->flags & HCD_USB2) {
+                        switch (hcd->driver->flags & HCD_MASK) {
+                        case HCD_USB3:
+                                bufp = ss_rh_config_descriptor;
+                                len = sizeof ss_rh_config_descriptor;
+                                break;
+                        case HCD_USB2:
                                 bufp = hs_rh_config_descriptor;
                                 len = sizeof hs_rh_config_descriptor;
-                        } else {
+                                break;
+                        case HCD_USB11:
                                 bufp = fs_rh_config_descriptor;
                                 len = sizeof fs_rh_config_descriptor;
+                                break;
+                        default:
+                                goto error;
                         }
                         if (device_can_wakeup(&hcd->self.root_hub->dev))
                                 patch_wakeup = 1;
@@ -755,23 +833,6 @@ static struct attribute_group usb_bus_attr_group = {
 
 /*-------------------------------------------------------------------------*/
 
-static struct class *usb_host_class;
-
-int usb_host_init(void)
-{
-        int retval = 0;
-
-        usb_host_class = class_create(THIS_MODULE, "usb_host");
-        if (IS_ERR(usb_host_class))
-                retval = PTR_ERR(usb_host_class);
-        return retval;
-}
-
-void usb_host_cleanup(void)
-{
-        class_destroy(usb_host_class);
-}
-
 /**
  * usb_bus_init - shared initialization code
  * @bus: the bus structure being initialized
@@ -818,12 +879,6 @@ static int usb_register_bus(struct usb_bus *bus)
         set_bit (busnum, busmap.busmap);
         bus->busnum = busnum;
 
-        bus->dev = device_create(usb_host_class, bus->controller, MKDEV(0, 0),
-                                 bus, "usb_host%d", busnum);
-        result = PTR_ERR(bus->dev);
-        if (IS_ERR(bus->dev))
-                goto error_create_class_dev;
-
         /* Add it to the local list of buses */
         list_add (&bus->bus_list, &usb_bus_list);
         mutex_unlock(&usb_bus_list_lock);
@@ -834,8 +889,6 @@ static int usb_register_bus(struct usb_bus *bus)
                   "number %d\n", bus->busnum);
         return 0;
 
-error_create_class_dev:
-        clear_bit(busnum, busmap.busmap);
 error_find_busnum:
         mutex_unlock(&usb_bus_list_lock);
         return result;
@@ -865,8 +918,6 @@ static void usb_deregister_bus (struct usb_bus *bus)
         usb_notify_remove_bus(bus);
 
         clear_bit (bus->busnum, busmap.busmap);
-
-        device_unregister(bus->dev);
 }
 
 /**
@@ -1199,7 +1250,8 @@ static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 
         /* Map the URB's buffers for DMA access.
          * Lower level HCD code should use *_dma exclusively,
-         * unless it uses pio or talks to another transport.
+         * unless it uses pio or talks to another transport,
+         * or uses the provided scatter gather list for bulk.
          */
         if (is_root_hub(urb->dev))
                 return 0;
@@ -1520,6 +1572,92 @@ rescan:
         }
 }
 
+/* Check whether a new configuration or alt setting for an interface
+ * will exceed the bandwidth for the bus (or the host controller resources).
+ * Only pass in a non-NULL config or interface, not both!
+ * Passing NULL for both new_config and new_intf means the device will be
+ * de-configured by issuing a set configuration 0 command.
+ */
+int usb_hcd_check_bandwidth(struct usb_device *udev,
+                struct usb_host_config *new_config,
+                struct usb_interface *new_intf)
+{
+        int num_intfs, i, j;
+        struct usb_interface_cache *intf_cache;
+        struct usb_host_interface *alt = 0;
+        int ret = 0;
+        struct usb_hcd *hcd;
+        struct usb_host_endpoint *ep;
+
+        hcd = bus_to_hcd(udev->bus);
+        if (!hcd->driver->check_bandwidth)
+                return 0;
+
+        /* Configuration is being removed - set configuration 0 */
+        if (!new_config && !new_intf) {
+                for (i = 1; i < 16; ++i) {
+                        ep = udev->ep_out[i];
+                        if (ep)
+                                hcd->driver->drop_endpoint(hcd, udev, ep);
+                        ep = udev->ep_in[i];
+                        if (ep)
+                                hcd->driver->drop_endpoint(hcd, udev, ep);
+                }
+                hcd->driver->check_bandwidth(hcd, udev);
+                return 0;
+        }
+        /* Check if the HCD says there's enough bandwidth.  Enable all endpoints
+         * each interface's alt setting 0 and ask the HCD to check the bandwidth
+         * of the bus.  There will always be bandwidth for endpoint 0, so it's
+         * ok to exclude it.
+         */
+        if (new_config) {
+                num_intfs = new_config->desc.bNumInterfaces;
+                /* Remove endpoints (except endpoint 0, which is always on the
+                 * schedule) from the old config from the schedule
+                 */
+                for (i = 1; i < 16; ++i) {
+                        ep = udev->ep_out[i];
+                        if (ep) {
+                                ret = hcd->driver->drop_endpoint(hcd, udev, ep);
+                                if (ret < 0)
+                                        goto reset;
+                        }
+                        ep = udev->ep_in[i];
+                        if (ep) {
+                                ret = hcd->driver->drop_endpoint(hcd, udev, ep);
+                                if (ret < 0)
+                                        goto reset;
+                        }
+                }
+                for (i = 0; i < num_intfs; ++i) {
+
+                        /* Dig the endpoints for alt setting 0 out of the
+                         * interface cache for this interface
+                         */
+                        intf_cache = new_config->intf_cache[i];
+                        for (j = 0; j < intf_cache->num_altsetting; j++) {
+                                if (intf_cache->altsetting[j].desc.bAlternateSetting == 0)
+                                        alt = &intf_cache->altsetting[j];
+                        }
+                        if (!alt) {
+                                printk(KERN_DEBUG "Did not find alt setting 0 for intf %d\n", i);
+                                continue;
+                        }
+                        for (j = 0; j < alt->desc.bNumEndpoints; j++) {
+                                ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
+                                if (ret < 0)
+                                        goto reset;
+                        }
+                }
+        }
+        ret = hcd->driver->check_bandwidth(hcd, udev);
+reset:
+        if (ret < 0)
+                hcd->driver->reset_bandwidth(hcd, udev);
+        return ret;
+}
+
 /* Disables the endpoint: synchronizes with the hcd to make sure all
  * endpoint state is gone from hardware.  usb_hcd_flush_endpoint() must
  * have been called previously.  Use for set_configuration, set_interface,
@@ -1897,8 +2035,20 @@ int usb_add_hcd(struct usb_hcd *hcd,
                 retval = -ENOMEM;
                 goto err_allocate_root_hub;
         }
-        rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
-                        USB_SPEED_FULL;
+
+        switch (hcd->driver->flags & HCD_MASK) {
+        case HCD_USB11:
+                rhdev->speed = USB_SPEED_FULL;
+                break;
+        case HCD_USB2:
+                rhdev->speed = USB_SPEED_HIGH;
+                break;
+        case HCD_USB3:
+                rhdev->speed = USB_SPEED_SUPER;
+                break;
+        default:
+                goto err_allocate_root_hub;
+        }
         hcd->self.root_hub = rhdev;
 
         /* wakeup flag init defaults to "everything works" for root hubs,
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index e7d4479de41c..d397ecfd5b17 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -173,6 +173,8 @@ struct hc_driver {
 #define HCD_LOCAL_MEM   0x0002          /* HC needs local memory */
 #define HCD_USB11       0x0010          /* USB 1.1 */
 #define HCD_USB2        0x0020          /* USB 2.0 */
+#define HCD_USB3        0x0040          /* USB 3.0 */
+#define HCD_MASK        0x0070
 
         /* called to init HCD and root hub */
         int     (*reset) (struct usb_hcd *hcd);
@@ -182,10 +184,10 @@ struct hc_driver {
          * a whole, not just the root hub; they're for PCI bus glue.
          */
         /* called after suspending the hub, before entering D3 etc */
-        int     (*pci_suspend) (struct usb_hcd *hcd, pm_message_t message);
+        int     (*pci_suspend)(struct usb_hcd *hcd);
 
         /* called after entering D0 (etc), before resuming the hub */
-        int     (*pci_resume) (struct usb_hcd *hcd);
+        int     (*pci_resume)(struct usb_hcd *hcd, bool hibernated);
 
         /* cleanly make HCD stop writing memory and doing I/O */
         void    (*stop) (struct usb_hcd *hcd);
@@ -224,6 +226,43 @@ struct hc_driver {
         void    (*relinquish_port)(struct usb_hcd *, int);
                 /* has a port been handed over to a companion? */
         int     (*port_handed_over)(struct usb_hcd *, int);
+
+        /* xHCI specific functions */
+                /* Called by usb_alloc_dev to alloc HC device structures */
+        int     (*alloc_dev)(struct usb_hcd *, struct usb_device *);
+                /* Called by usb_release_dev to free HC device structures */
+        void    (*free_dev)(struct usb_hcd *, struct usb_device *);
+
+        /* Bandwidth computation functions */
+        /* Note that add_endpoint() can only be called once per endpoint before
+         * check_bandwidth() or reset_bandwidth() must be called.
+         * drop_endpoint() can only be called once per endpoint also.
+         * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
+         * add the endpoint to the schedule with possibly new parameters denoted by a
+         * different endpoint descriptor in usb_host_endpoint.
+         * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
+         * not allowed.
+         */
+                /* Allocate endpoint resources and add them to a new schedule */
+        int     (*add_endpoint)(struct usb_hcd *, struct usb_device *, struct usb_host_endpoint *);
+                /* Drop an endpoint from a new schedule */
+        int     (*drop_endpoint)(struct usb_hcd *, struct usb_device *, struct usb_host_endpoint *);
+                /* Check that a new hardware configuration, set using
+                 * endpoint_enable and endpoint_disable, does not exceed bus
+                 * bandwidth.  This must be called before any set configuration
+                 * or set interface requests are sent to the device.
+                 */
+        int     (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
+                /* Reset the device schedule to the last known good schedule,
+                 * which was set from a previous successful call to
+                 * check_bandwidth().  This reverts any add_endpoint() and
+                 * drop_endpoint() calls since that last successful call.
+                 * Used for when a check_bandwidth() call fails due to resource
+                 * or bandwidth constraints.
+                 */
+        void    (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
+                /* Returns the hardware-chosen device address */
+        int     (*address_device)(struct usb_hcd *, struct usb_device *udev);
 };
 
 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
@@ -242,6 +281,9 @@ extern void usb_hcd_disable_endpoint(struct usb_device *udev,
 extern void usb_hcd_reset_endpoint(struct usb_device *udev,
                 struct usb_host_endpoint *ep);
 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
+extern int usb_hcd_check_bandwidth(struct usb_device *udev,
+                struct usb_host_config *new_config,
+                struct usb_interface *new_intf);
 extern int usb_hcd_get_frame_number(struct usb_device *udev);
 
 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
@@ -261,14 +303,11 @@ struct pci_device_id;
 extern int usb_hcd_pci_probe(struct pci_dev *dev,
                                 const struct pci_device_id *id);
 extern void usb_hcd_pci_remove(struct pci_dev *dev);
-
-#ifdef CONFIG_PM
-extern int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t msg);
-extern int usb_hcd_pci_resume(struct pci_dev *dev);
-#endif /* CONFIG_PM */
-
 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
 
+#ifdef CONFIG_PM_SLEEP
+extern struct dev_pm_ops        usb_hcd_pci_pm_ops;
+#endif
 #endif /* CONFIG_PCI */
 
 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index be86ae3f4088..2af3b4f06054 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -155,6 +155,8 @@ static inline char *portspeed(int portstatus)
                 return "480 Mb/s";
         else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
                 return "1.5 Mb/s";
+        else if (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED))
+                return "5.0 Gb/s";
         else
                 return "12 Mb/s";
 }
@@ -457,13 +459,13 @@ static void hub_tt_kevent (struct work_struct *work)
 
         spin_lock_irqsave (&hub->tt.lock, flags);
         while (--limit && !list_empty (&hub->tt.clear_list)) {
-                struct list_head        *temp;
+                struct list_head        *next;
                 struct usb_tt_clear     *clear;
                 struct usb_device       *hdev = hub->hdev;
                 int                     status;
 
-                temp = hub->tt.clear_list.next;
-                clear = list_entry (temp, struct usb_tt_clear, clear_list);
+                next = hub->tt.clear_list.next;
+                clear = list_entry (next, struct usb_tt_clear, clear_list);
                 list_del (&clear->clear_list);
 
                 /* drop lock so HCD can concurrently report other TT errors */
@@ -951,6 +953,9 @@ static int hub_configure(struct usb_hub *hub,
                                         ret);
                         hub->tt.hub = hdev;
                         break;
+                case 3:
+                        /* USB 3.0 hubs don't have a TT */
+                        break;
                 default:
                         dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
                                 hdev->descriptor.bDeviceProtocol);
@@ -1323,6 +1328,11 @@ EXPORT_SYMBOL_GPL(usb_set_device_state);
  * 0 is reserved by USB for default address; (b) Linux's USB stack
  * uses always #1 for the root hub of the controller. So USB stack's
  * port #1, which is wusb virtual-port #0 has address #2.
+ *
+ * Devices connected under xHCI are not as simple.  The host controller
+ * supports virtualization, so the hardware assigns device addresses and
+ * the HCD must setup data structures before issuing a set address
+ * command to the hardware.
  */
 static void choose_address(struct usb_device *udev)
 {
@@ -1642,6 +1652,9 @@ int usb_new_device(struct usb_device *udev)
         err = usb_configure_device(udev);       /* detect & probe dev/intfs */
         if (err < 0)
                 goto fail;
+        dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
+                        udev->devnum, udev->bus->busnum,
+                        (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
         /* export the usbdev device-node for libusb */
         udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
                         (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
@@ -2395,19 +2408,29 @@ EXPORT_SYMBOL_GPL(usb_ep0_reinit);
 static int hub_set_address(struct usb_device *udev, int devnum)
 {
         int retval;
+        struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 
-        if (devnum <= 1)
+        /*
+         * The host controller will choose the device address,
+         * instead of the core having chosen it earlier
+         */
+        if (!hcd->driver->address_device && devnum <= 1)
                 return -EINVAL;
         if (udev->state == USB_STATE_ADDRESS)
                 return 0;
         if (udev->state != USB_STATE_DEFAULT)
                 return -EINVAL;
-        retval = usb_control_msg(udev, usb_sndaddr0pipe(),
-                USB_REQ_SET_ADDRESS, 0, devnum, 0,
-                NULL, 0, USB_CTRL_SET_TIMEOUT);
+        if (hcd->driver->address_device) {
+                retval = hcd->driver->address_device(hcd, udev);
+        } else {
+                retval = usb_control_msg(udev, usb_sndaddr0pipe(),
+                                USB_REQ_SET_ADDRESS, 0, devnum, 0,
+                                NULL, 0, USB_CTRL_SET_TIMEOUT);
+                if (retval == 0)
+                        update_address(udev, devnum);
+        }
         if (retval == 0) {
                 /* Device now using proper address. */
-                update_address(udev, devnum);
                 usb_set_device_state(udev, USB_STATE_ADDRESS);
                 usb_ep0_reinit(udev);
         }
@@ -2430,6 +2453,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
         static DEFINE_MUTEX(usb_address0_mutex);
 
         struct usb_device       *hdev = hub->hdev;
+        struct usb_hcd          *hcd = bus_to_hcd(hdev->bus);
         int                     i, j, retval;
         unsigned                delay = HUB_SHORT_RESET_TIME;
         enum usb_device_speed   oldspeed = udev->speed;
@@ -2452,11 +2476,24 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 
         mutex_lock(&usb_address0_mutex);
 
-        /* Reset the device; full speed may morph to high speed */
-        retval = hub_port_reset(hub, port1, udev, delay);
-        if (retval < 0)         /* error or disconnect */
+        if ((hcd->driver->flags & HCD_USB3) && udev->config) {
+                /* FIXME this will need special handling by the xHCI driver. */
+                dev_dbg(&udev->dev,
+                                "xHCI reset of configured device "
+                                "not supported yet.\n");
+                retval = -EINVAL;
                 goto fail;
-                                /* success, speed is known */
+        } else if (!udev->config && oldspeed == USB_SPEED_SUPER) {
+                /* Don't reset USB 3.0 devices during an initial setup */
+                usb_set_device_state(udev, USB_STATE_DEFAULT);
+        } else {
+                /* Reset the device; full speed may morph to high speed */
+                /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
+                retval = hub_port_reset(hub, port1, udev, delay);
+                if (retval < 0)         /* error or disconnect */
+                        goto fail;
+                /* success, speed is known */
+        }
         retval = -ENODEV;
 
         if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
@@ -2471,6 +2508,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
          * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
          */
         switch (udev->speed) {
+        case USB_SPEED_SUPER:
         case USB_SPEED_VARIABLE:        /* fixed at 512 */
                 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
                 break;
@@ -2496,16 +2534,20 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
         case USB_SPEED_LOW:     speed = "low";  break;
         case USB_SPEED_FULL:    speed = "full"; break;
         case USB_SPEED_HIGH:    speed = "high"; break;
+        case USB_SPEED_SUPER:
+                                speed = "super";
+                                break;
         case USB_SPEED_VARIABLE:
                                 speed = "variable";
                                 type = "Wireless ";
                                 break;
         default:                speed = "?";    break;
         }
-        dev_info (&udev->dev,
-                  "%s %s speed %sUSB device using %s and address %d\n",
-                  (udev->config) ? "reset" : "new", speed, type,
-                  udev->bus->controller->driver->name, devnum);
+        if (udev->speed != USB_SPEED_SUPER)
+                dev_info(&udev->dev,
+                                "%s %s speed %sUSB device using %s and address %d\n",
+                                (udev->config) ? "reset" : "new", speed, type,
+                                udev->bus->controller->driver->name, devnum);
 
         /* Set up TT records, if needed  */
         if (hdev->tt) {
@@ -2530,7 +2572,11 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
          * value.
          */
         for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
-                if (USE_NEW_SCHEME(retry_counter)) {
+                /*
+                 * An xHCI controller cannot send any packets to a device until
+                 * a set address command successfully completes.
+                 */
+                if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) {
                         struct usb_device_descriptor *buf;
                         int r = 0;
 
@@ -2596,7 +2642,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
                  * unauthorized address in the Connect Ack sequence;
                  * authorization will assign the final address.
                  */
-                if (udev->wusb == 0) {
+                if (udev->wusb == 0) {
                         for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
                                 retval = hub_set_address(udev, devnum);
                                 if (retval >= 0)
@@ -2609,13 +2655,20 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
                                         devnum, retval);
                                 goto fail;
                         }
+                        if (udev->speed == USB_SPEED_SUPER) {
+                                devnum = udev->devnum;
+                                dev_info(&udev->dev,
+                                                "%s SuperSpeed USB device using %s and address %d\n",
+                                                (udev->config) ? "reset" : "new",
+                                                udev->bus->controller->driver->name, devnum);
+                        }
 
                         /* cope with hardware quirkiness:
                          *  - let SET_ADDRESS settle, some device hardware wants it
                          *  - read ep0 maxpacket even for high and low speed,
                          */
                         msleep(10);
-                        if (USE_NEW_SCHEME(retry_counter))
+                        if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3))
                                 break;
                 }
 
@@ -2634,8 +2687,11 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
         if (retval)
                 goto fail;
 
-        i = udev->descriptor.bMaxPacketSize0 == 0xff?   /* wusb device? */
-            512 : udev->descriptor.bMaxPacketSize0;
+        if (udev->descriptor.bMaxPacketSize0 == 0xff ||
+                        udev->speed == USB_SPEED_SUPER)
+                i = 512;
+        else
+                i = udev->descriptor.bMaxPacketSize0;
         if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
                 if (udev->speed != USB_SPEED_FULL ||
                                 !(i == 8 || i == 16 || i == 32 || i == 64)) {
@@ -2847,19 +2903,41 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
                 }
 
                 usb_set_device_state(udev, USB_STATE_POWERED);
-                udev->speed = USB_SPEED_UNKNOWN;
                 udev->bus_mA = hub->mA_per_port;
                 udev->level = hdev->level + 1;
                 udev->wusb = hub_is_wusb(hub);
 
-                /* set the address */
-                choose_address(udev);
-                if (udev->devnum <= 0) {
-                        status = -ENOTCONN;     /* Don't retry */
-                        goto loop;
+                /*
+                 * USB 3.0 devices are reset automatically before the connect
+                 * port status change appears, and the root hub port status
+                 * shows the correct speed.  We also get port change
+                 * notifications for USB 3.0 devices from the USB 3.0 portion of
+                 * an external USB 3.0 hub, but this isn't handled correctly yet
+                 * FIXME.
+                 */
+
+                if (!(hcd->driver->flags & HCD_USB3))
+                        udev->speed = USB_SPEED_UNKNOWN;
+                else if ((hdev->parent == NULL) &&
+                                (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED)))
+                        udev->speed = USB_SPEED_SUPER;
+                else
+                        udev->speed = USB_SPEED_UNKNOWN;
+
+                /*
+                 * xHCI needs to issue an address device command later
+                 * in the hub_port_init sequence for SS/HS/FS/LS devices.
+                 */
+                if (!(hcd->driver->flags & HCD_USB3)) {
+                        /* set the address */
+                        choose_address(udev);
+                        if (udev->devnum <= 0) {
+                                status = -ENOTCONN;     /* Don't retry */
+                                goto loop;
+                        }
                 }
 
-                /* reset and get descriptor */
+                /* reset (non-USB 3.0 devices) and get descriptor */
                 status = hub_port_init(hub, udev, port1, i);
                 if (status < 0)
                         goto loop;
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 2a116ce53c9b..889c0f32a40b 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -47,7 +47,10 @@
 #define USB_PORT_FEAT_L1                5       /* L1 suspend */
 #define USB_PORT_FEAT_POWER             8
 #define USB_PORT_FEAT_LOWSPEED          9
+/* This value was never in Table 11-17 */
 #define USB_PORT_FEAT_HIGHSPEED         10
+/* This value is also fake */
+#define USB_PORT_FEAT_SUPERSPEED        11
 #define USB_PORT_FEAT_C_CONNECTION      16
 #define USB_PORT_FEAT_C_ENABLE          17
 #define USB_PORT_FEAT_C_SUSPEND         18
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index b62628377654..2bed83caacb1 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -10,6 +10,7 @@
 #include <linux/mm.h>
 #include <linux/timer.h>
 #include <linux/ctype.h>
+#include <linux/nls.h>
 #include <linux/device.h>
 #include <linux/scatterlist.h>
 #include <linux/usb/quirks.h>
@@ -364,6 +365,7 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
         int i;
         int urb_flags;
         int dma;
+        int use_sg;
 
         if (!io || !dev || !sg
                         || usb_pipecontrol(pipe)
@@ -391,7 +393,19 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
         if (io->entries <= 0)
                 return io->entries;
 
-        io->urbs = kmalloc(io->entries * sizeof *io->urbs, mem_flags);
+        /* If we're running on an xHCI host controller, queue the whole scatter
+         * gather list with one call to urb_enqueue().  This is only for bulk,
+         * as that endpoint type does not care how the data gets broken up
+         * across frames.
+         */
+        if (usb_pipebulk(pipe) &&
+                        bus_to_hcd(dev->bus)->driver->flags & HCD_USB3) {
+                io->urbs = kmalloc(sizeof *io->urbs, mem_flags);
+                use_sg = true;
+        } else {
+                io->urbs = kmalloc(io->entries * sizeof *io->urbs, mem_flags);
+                use_sg = false;
+        }
         if (!io->urbs)
                 goto nomem;
 
@@ -401,62 +415,92 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
         if (usb_pipein(pipe))
                 urb_flags |= URB_SHORT_NOT_OK;
 
-        for_each_sg(sg, sg, io->entries, i) {
-                unsigned len;
-
-                io->urbs[i] = usb_alloc_urb(0, mem_flags);
-                if (!io->urbs[i]) {
-                        io->entries = i;
+        if (use_sg) {
+                io->urbs[0] = usb_alloc_urb(0, mem_flags);
+                if (!io->urbs[0]) {
+                        io->entries = 0;
                         goto nomem;
                 }
 
-                io->urbs[i]->dev = NULL;
-                io->urbs[i]->pipe = pipe;
-                io->urbs[i]->interval = period;
-                io->urbs[i]->transfer_flags = urb_flags;
-
-                io->urbs[i]->complete = sg_complete;
-                io->urbs[i]->context = io;
-
-                /*
-                 * Some systems need to revert to PIO when DMA is temporarily
-                 * unavailable.  For their sakes, both transfer_buffer and
-                 * transfer_dma are set when possible.  However this can only
-                 * work on systems without:
-                 *
-                 *  - HIGHMEM, since DMA buffers located in high memory are
-                 *    not directly addressable by the CPU for PIO;
-                 *
-                 *  - IOMMU, since dma_map_sg() is allowed to use an IOMMU to
-                 *    make virtually discontiguous buffers be "dma-contiguous"
-                 *    so that PIO and DMA need diferent numbers of URBs.
-                 *
-                 * So when HIGHMEM or IOMMU are in use, transfer_buffer is NULL
-                 * to prevent stale pointers and to help spot bugs.
-                 */
-                if (dma) {
-                        io->urbs[i]->transfer_dma = sg_dma_address(sg);
-                        len = sg_dma_len(sg);
+                io->urbs[0]->dev = NULL;
+                io->urbs[0]->pipe = pipe;
+                io->urbs[0]->interval = period;
+                io->urbs[0]->transfer_flags = urb_flags;
+
+                io->urbs[0]->complete = sg_complete;
+                io->urbs[0]->context = io;
+                /* A length of zero means transfer the whole sg list */
+                io->urbs[0]->transfer_buffer_length = length;
+                if (length == 0) {
+                        for_each_sg(sg, sg, io->entries, i) {
+                                io->urbs[0]->transfer_buffer_length +=
+                                        sg_dma_len(sg);
+                        }
+                }
+                io->urbs[0]->sg = io;
+                io->urbs[0]->num_sgs = io->entries;
+                io->entries = 1;
+        } else {
+                for_each_sg(sg, sg, io->entries, i) {
+                        unsigned len;
+
+                        io->urbs[i] = usb_alloc_urb(0, mem_flags);
+                        if (!io->urbs[i]) {
+                                io->entries = i;
+                                goto nomem;
+                        }
+
+                        io->urbs[i]->dev = NULL;
+                        io->urbs[i]->pipe = pipe;
+                        io->urbs[i]->interval = period;
+                        io->urbs[i]->transfer_flags = urb_flags;
+
+                        io->urbs[i]->complete = sg_complete;
+                        io->urbs[i]->context = io;
+
+                        /*
+                         * Some systems need to revert to PIO when DMA is
+                         * temporarily unavailable.  For their sakes, both
+                         * transfer_buffer and transfer_dma are set when
+                         * possible.  However this can only work on systems
+                         * without:
+                         *
+                         *  - HIGHMEM, since DMA buffers located in high memory
+                         *    are not directly addressable by the CPU for PIO;
+                         *
+                         *  - IOMMU, since dma_map_sg() is allowed to use an
+                         *    IOMMU to make virtually discontiguous buffers be
+                         *    "dma-contiguous" so that PIO and DMA need diferent
+                         *    numbers of URBs.
+                         *
+                         * So when HIGHMEM or IOMMU are in use, transfer_buffer
+                         * is NULL to prevent stale pointers and to help spot
+                         * bugs.
+                         */
+                        if (dma) {
+                                io->urbs[i]->transfer_dma = sg_dma_address(sg);
+                                len = sg_dma_len(sg);
 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_GART_IOMMU)
-                        io->urbs[i]->transfer_buffer = NULL;
+                                io->urbs[i]->transfer_buffer = NULL;
 #else
-                        io->urbs[i]->transfer_buffer = sg_virt(sg);
+                                io->urbs[i]->transfer_buffer = sg_virt(sg);
 #endif
-                } else {
-                        /* hc may use _only_ transfer_buffer */
-                        io->urbs[i]->transfer_buffer = sg_virt(sg);
-                        len = sg->length;
-                }
+                        } else {
+                                /* hc may use _only_ transfer_buffer */
+                                io->urbs[i]->transfer_buffer = sg_virt(sg);
+                                len = sg->length;
+                        }
 
-                if (length) {
-                        len = min_t(unsigned, len, length);
-                        length -= len;
-                        if (length == 0)
-                                io->entries = i + 1;
+                        if (length) {
+                                len = min_t(unsigned, len, length);
+                                length -= len;
+                                if (length == 0)
+                                        io->entries = i + 1;
+                        }
+                        io->urbs[i]->transfer_buffer_length = len;
                 }
-                io->urbs[i]->transfer_buffer_length = len;
+                io->urbs[--i]->transfer_flags &= ~URB_NO_INTERRUPT;
         }
-        io->urbs[--i]->transfer_flags &= ~URB_NO_INTERRUPT;
 
         /* transaction state */
         io->count = io->entries;
@@ -509,6 +553,10 @@ EXPORT_SYMBOL_GPL(usb_sg_init);
  * could be transferred.  That capability is less useful for low or full
  * speed interrupt endpoints, which allow at most one packet per millisecond,
  * of at most 8 or 64 bytes (respectively).
+ *
+ * It is not necessary to call this function to reserve bandwidth for devices
+ * under an xHCI host controller, as the bandwidth is reserved when the
+ * configuration or interface alt setting is selected.
  */
 void usb_sg_wait(struct usb_sg_request *io)
 {
@@ -759,7 +807,7 @@ static int usb_string_sub(struct usb_device *dev, unsigned int langid,
 }
 
 /**
- * usb_string - returns ISO 8859-1 version of a string descriptor
+ * usb_string - returns UTF-8 version of a string descriptor
  * @dev: the device whose string descriptor is being retrieved
  * @index: the number of the descriptor
  * @buf: where to put the string
@@ -767,17 +815,10 @@ static int usb_string_sub(struct usb_device *dev, unsigned int langid,
  * Context: !in_interrupt ()
  *
  * This converts the UTF-16LE encoded strings returned by devices, from
- * usb_get_string_descriptor(), to null-terminated ISO-8859-1 encoded ones
- * that are more usable in most kernel contexts.  Note that all characters
- * in the chosen descriptor that can't be encoded using ISO-8859-1
- * are converted to the question mark ("?") character, and this function
+ * usb_get_string_descriptor(), to null-terminated UTF-8 encoded ones
+ * that are more usable in most kernel contexts.  Note that this function
  * chooses strings in the first language supported by the device.
  *
- * The ASCII (or, redundantly, "US-ASCII") character set is the seven-bit
- * subset of ISO 8859-1. ISO-8859-1 is the eight-bit subset of Unicode,
- * and is appropriate for use many uses of English and several other
- * Western European languages.  (But it doesn't include the "Euro" symbol.)
- *
  * This call is synchronous, and may not be used in an interrupt context.
  *
  * Returns length of the string (>= 0) or usb_control_msg status (< 0).
@@ -786,7 +827,6 @@ int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
 {
         unsigned char *tbuf;
         int err;
-        unsigned int u, idx;
 
         if (dev->state == USB_STATE_SUSPENDED)
                 return -EHOSTUNREACH;
@@ -821,16 +861,9 @@ int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
                 goto errout;
 
         size--;         /* leave room for trailing NULL char in output buffer */
-        for (idx = 0, u = 2; u < err; u += 2) {
-                if (idx >= size)
-                        break;
-                if (tbuf[u+1])                  /* high byte */
-                        buf[idx++] = '?';  /* non ISO-8859-1 character */
-                else
-                        buf[idx++] = tbuf[u];
-        }
-        buf[idx] = 0;
-        err = idx;
+        err = utf16s_to_utf8s((wchar_t *) &tbuf[2], (err - 2) / 2,
+                        UTF16_LITTLE_ENDIAN, buf, size);
+        buf[err] = 0;
 
         if (tbuf[1] != USB_DT_STRING)
                 dev_dbg(&dev->dev,
@@ -843,6 +876,9 @@ int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
 }
 EXPORT_SYMBOL_GPL(usb_string);
 
+/* one UTF-8-encoded 16-bit character has at most three bytes */
+#define MAX_USB_STRING_SIZE (127 * 3 + 1)
+
 /**
  * usb_cache_string - read a string descriptor and cache it for later use
  * @udev: the device whose string descriptor is being read
@@ -860,9 +896,9 @@ char *usb_cache_string(struct usb_device *udev, int index)
         if (index <= 0)
                 return NULL;
 
-        buf = kmalloc(256, GFP_KERNEL);
+        buf = kmalloc(MAX_USB_STRING_SIZE, GFP_KERNEL);
         if (buf) {
-                len = usb_string(udev, index, buf, 256);
+                len = usb_string(udev, index, buf, MAX_USB_STRING_SIZE);
                 if (len > 0) {
                         smallbuf = kmalloc(++len, GFP_KERNEL);
                         if (!smallbuf)
@@ -1664,6 +1700,21 @@ free_interfaces:
         if (ret)
                 goto free_interfaces;
 
+        /* Make sure we have bandwidth (and available HCD resources) for this
+         * configuration.  Remove endpoints from the schedule if we're dropping
+         * this configuration to set configuration 0.  After this point, the
+         * host controller will not allow submissions to dropped endpoints.  If
+         * this call fails, the device state is unchanged.
+         */
+        if (cp)
+                ret = usb_hcd_check_bandwidth(dev, cp, NULL);
+        else
+                ret = usb_hcd_check_bandwidth(dev, NULL, NULL);
+        if (ret < 0) {
+                usb_autosuspend_device(dev);
+                goto free_interfaces;
+        }
+
         /* if it's already configured, clear out old state first.
          * getting rid of old interfaces means unbinding their drivers.
          */
@@ -1686,6 +1737,7 @@ free_interfaces:
         dev->actconfig = cp;
         if (!cp) {
                 usb_set_device_state(dev, USB_STATE_ADDRESS);
+                usb_hcd_check_bandwidth(dev, NULL, NULL);
                 usb_autosuspend_device(dev);
                 goto free_interfaces;
         }
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index c66789197927..b5c72e458943 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -552,8 +552,8 @@ static struct attribute *dev_string_attrs[] = {
 static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
                 struct attribute *a, int n)
 {
-        struct usb_device *udev = to_usb_device(
-                        container_of(kobj, struct device, kobj));
+        struct device *dev = container_of(kobj, struct device, kobj);
+        struct usb_device *udev = to_usb_device(dev);
 
         if (a == &dev_attr_manufacturer.attr) {
                 if (udev->manufacturer == NULL)
@@ -585,8 +585,8 @@ static ssize_t
 read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
                 char *buf, loff_t off, size_t count)
 {
-        struct usb_device *udev = to_usb_device(
-                        container_of(kobj, struct device, kobj));
+        struct device *dev = container_of(kobj, struct device, kobj);
+        struct usb_device *udev = to_usb_device(dev);
         size_t nleft = count;
         size_t srclen, n;
         int cfgno;
@@ -786,8 +786,8 @@ static struct attribute *intf_assoc_attrs[] = {
 static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
                 struct attribute *a, int n)
 {
-        struct usb_interface *intf = to_usb_interface(
-                        container_of(kobj, struct device, kobj));
+        struct device *dev = container_of(kobj, struct device, kobj);
+        struct usb_interface *intf = to_usb_interface(dev);
 
         if (intf->intf_assoc == NULL)
                 return 0;
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 3376055f36e7..0885d4abdc62 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -241,6 +241,12 @@ EXPORT_SYMBOL_GPL(usb_unanchor_urb);
  * If the USB subsystem can't allocate sufficient bandwidth to perform
  * the periodic request, submitting such a periodic request should fail.
  *
+ * For devices under xHCI, the bandwidth is reserved at configuration time, or
+ * when the alt setting is selected.  If there is not enough bus bandwidth, the
+ * configuration/alt setting request will fail.  Therefore, submissions to
+ * periodic endpoints on devices under xHCI should never fail due to bandwidth
+ * constraints.
+ *
  * Device drivers must explicitly request that repetition, by ensuring that
  * some URB is always on the endpoint's queue (except possibly for short
  * periods during completion callacks).  When there is no longer an urb
@@ -351,6 +357,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
         if (xfertype == USB_ENDPOINT_XFER_ISOC) {
                 int     n, len;
 
+                /* FIXME SuperSpeed isoc endpoints have up to 16 bursts */
                 /* "high bandwidth" mode, 1-3 packets/uframe? */
                 if (dev->speed == USB_SPEED_HIGH) {
                         int     mult = 1 + ((max >> 11) & 0x03);
@@ -426,6 +433,11 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
                         return -EINVAL;
                 /* too big? */
                 switch (dev->speed) {
+                case USB_SPEED_SUPER:   /* units are 125us */
+                        /* Handle up to 2^(16-1) microframes */
+                        if (urb->interval > (1 << 15))
+                                return -EINVAL;
+                        max = 1 << 15;
                 case USB_SPEED_HIGH:    /* units are microframes */
                         /* NOTE usb handles 2^15 */
                         if (urb->interval > (1024 * 8))
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 927a27dd2f85..a26f73880c32 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -34,6 +34,7 @@
 #include <linux/usb.h>
 #include <linux/mutex.h>
 #include <linux/workqueue.h>
+#include <linux/debugfs.h>
 
 #include <asm/io.h>
 #include <linux/scatterlist.h>
@@ -139,8 +140,7 @@ static int __find_interface(struct device *dev, void *data)
         struct find_interface_arg *arg = data;
         struct usb_interface *intf;
 
-        /* can't look at usb devices, only interfaces */
-        if (is_usb_device(dev))
+        if (!is_usb_interface(dev))
                 return 0;
 
         intf = to_usb_interface(dev);
@@ -184,11 +184,16 @@ EXPORT_SYMBOL_GPL(usb_find_interface);
 static void usb_release_dev(struct device *dev)
 {
         struct usb_device *udev;
+        struct usb_hcd *hcd;
 
         udev = to_usb_device(dev);
+        hcd = bus_to_hcd(udev->bus);
 
         usb_destroy_configuration(udev);
-        usb_put_hcd(bus_to_hcd(udev->bus));
+        /* Root hubs aren't real devices, so don't free HCD resources */
+        if (hcd->driver->free_dev && udev->parent)
+                hcd->driver->free_dev(hcd, udev);
+        usb_put_hcd(hcd);
         kfree(udev->product);
         kfree(udev->manufacturer);
         kfree(udev->serial);
@@ -359,6 +364,13 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
                 kfree(dev);
                 return NULL;
         }
+        /* Root hubs aren't true devices, so don't allocate HCD resources */
+        if (usb_hcd->driver->alloc_dev && parent &&
+                !usb_hcd->driver->alloc_dev(usb_hcd, dev)) {
+                usb_put_hcd(bus_to_hcd(bus));
+                kfree(dev);
+                return NULL;
+        }
 
         device_initialize(&dev->dev);
         dev->dev.bus = &usb_bus_type;
@@ -386,18 +398,24 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
          */
         if (unlikely(!parent)) {
                 dev->devpath[0] = '0';
+                dev->route = 0;
 
                 dev->dev.parent = bus->controller;
                 dev_set_name(&dev->dev, "usb%d", bus->busnum);
                 root_hub = 1;
         } else {
                 /* match any labeling on the hubs; it's one-based */
-                if (parent->devpath[0] == '0')
+                if (parent->devpath[0] == '0') {
                         snprintf(dev->devpath, sizeof dev->devpath,
                                 "%d", port1);
-                else
+                        /* Root ports are not counted in route string */
+                        dev->route = 0;
+                } else {
                         snprintf(dev->devpath, sizeof dev->devpath,
                                 "%s.%d", parent->devpath, port1);
+                        dev->route = parent->route +
+                                (port1 << ((parent->level - 1)*4));
+                }
 
                 dev->dev.parent = &parent->dev;
                 dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath);
@@ -810,12 +828,12 @@ void usb_buffer_dmasync(struct urb *urb)
                 return;
 
         if (controller->dma_mask) {
-                dma_sync_single(controller,
+                dma_sync_single_for_cpu(controller,
                         urb->transfer_dma, urb->transfer_buffer_length,
                         usb_pipein(urb->pipe)
                                 ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
                 if (usb_pipecontrol(urb->pipe))
-                        dma_sync_single(controller,
+                        dma_sync_single_for_cpu(controller,
                                         urb->setup_dma,
                                         sizeof(struct usb_ctrlrequest),
                                         DMA_TO_DEVICE);
@@ -933,8 +951,8 @@ void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in,
                         || !controller->dma_mask)
                 return;
 
-        dma_sync_sg(controller, sg, n_hw_ents,
-                        is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+        dma_sync_sg_for_cpu(controller, sg, n_hw_ents,
+                            is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
 }
 EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg);
 #endif
@@ -1012,6 +1030,35 @@ static struct notifier_block usb_bus_nb = {
         .notifier_call = usb_bus_notify,
 };
 
+struct dentry *usb_debug_root;
+EXPORT_SYMBOL_GPL(usb_debug_root);
+
+struct dentry *usb_debug_devices;
+
+static int usb_debugfs_init(void)
+{
+        usb_debug_root = debugfs_create_dir("usb", NULL);
+        if (!usb_debug_root)
+                return -ENOENT;
+
+        usb_debug_devices = debugfs_create_file("devices", 0444,
+                                                usb_debug_root, NULL,
+                                                &usbfs_devices_fops);
+        if (!usb_debug_devices) {
+                debugfs_remove(usb_debug_root);
+                usb_debug_root = NULL;
+                return -ENOENT;
+        }
+
+        return 0;
+}
+
+static void usb_debugfs_cleanup(void)
+{
+        debugfs_remove(usb_debug_devices);
+        debugfs_remove(usb_debug_root);
+}
+
 /*
  * Init
  */
@@ -1023,6 +1070,10 @@ static int __init usb_init(void)
                 return 0;
         }
 
+        retval = usb_debugfs_init();
+        if (retval)
+                goto out;
+
         retval = ksuspend_usb_init();
         if (retval)
                 goto out;
@@ -1032,9 +1083,6 @@ static int __init usb_init(void)
         retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb);
         if (retval)
                 goto bus_notifier_failed;
-        retval = usb_host_init();
-        if (retval)
-                goto host_init_failed;
         retval = usb_major_init();
         if (retval)
                 goto major_init_failed;
@@ -1064,8 +1112,6 @@ usb_devio_init_failed:
 driver_register_failed:
         usb_major_cleanup();
 major_init_failed:
-        usb_host_cleanup();
-host_init_failed:
         bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
 bus_notifier_failed:
         bus_unregister(&usb_bus_type);
@@ -1090,10 +1136,10 @@ static void __exit usb_exit(void)
         usb_deregister(&usbfs_driver);
         usb_devio_cleanup();
         usb_hub_cleanup();
-        usb_host_cleanup();
         bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
         bus_unregister(&usb_bus_type);
         ksuspend_usb_cleanup();
+        usb_debugfs_cleanup();
 }
 
 subsys_initcall(usb_init);
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 79d8a9ea559b..e2a8cfaade1d 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -41,8 +41,6 @@ extern int  usb_hub_init(void);
 extern void usb_hub_cleanup(void);
 extern int usb_major_init(void);
 extern void usb_major_cleanup(void);
-extern int usb_host_init(void);
-extern void usb_host_cleanup(void);
 
 #ifdef  CONFIG_PM
 
@@ -106,6 +104,7 @@ extern struct workqueue_struct *ksuspend_usb_wq;
 extern struct bus_type usb_bus_type;
 extern struct device_type usb_device_type;
 extern struct device_type usb_if_device_type;
+extern struct device_type usb_ep_device_type;
 extern struct usb_device_driver usb_generic_driver;
 
 static inline int is_usb_device(const struct device *dev)
@@ -113,6 +112,16 @@ static inline int is_usb_device(const struct device *dev)
         return dev->type == &usb_device_type;
 }
 
+static inline int is_usb_interface(const struct device *dev)
+{
+        return dev->type == &usb_if_device_type;
+}
+
+static inline int is_usb_endpoint(const struct device *dev)
+{
+        return dev->type == &usb_ep_device_type;
+}
+
 /* Do the same for device drivers and interface drivers. */
 
 static inline int is_usb_device_driver(struct device_driver *drv)
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 080bb1e4b847..5d1ddf485d1e 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -156,7 +156,7 @@ config USB_ATMEL_USBA
 
 config USB_GADGET_FSL_USB2
         boolean "Freescale Highspeed USB DR Peripheral Controller"
-        depends on FSL_SOC
+        depends on FSL_SOC || ARCH_MXC
         select USB_GADGET_DUALSPEED
         help
            Some of Freescale PowerPC processors have a High Speed
@@ -253,7 +253,7 @@ config USB_PXA25X_SMALL
 
 config USB_GADGET_PXA27X
         boolean "PXA 27x"
-        depends on ARCH_PXA && PXA27x
+        depends on ARCH_PXA && (PXA27x || PXA3xx)
         select USB_OTG_UTILS
         help
            Intel's PXA 27x series XScale ARM v5TE processors include
@@ -272,6 +272,20 @@ config USB_PXA27X
         default USB_GADGET
         select USB_GADGET_SELECTED
 
+config USB_GADGET_S3C_HSOTG
+        boolean "S3C HS/OtG USB Device controller"
+        depends on S3C_DEV_USB_HSOTG
+        select USB_GADGET_S3C_HSOTG_PIO
+        help
+          The Samsung S3C64XX USB2.0 high-speed gadget controller
+          integrated into the S3C64XX series SoC.
+
+config USB_S3C_HSOTG
+        tristate
+        depends on USB_GADGET_S3C_HSOTG
+        default USB_GADGET
+        select USB_GADGET_SELECTED
+
 config USB_GADGET_S3C2410
         boolean "S3C2410 USB Device Controller"
         depends on ARCH_S3C2410
@@ -460,6 +474,27 @@ config USB_GOKU
         default USB_GADGET
         select USB_GADGET_SELECTED
 
+config USB_GADGET_LANGWELL
+        boolean "Intel Langwell USB Device Controller"
+        depends on PCI
+        select USB_GADGET_DUALSPEED
+        help
+           Intel Langwell USB Device Controller is a High-Speed USB
+           On-The-Go device controller.
+
+           The number of programmable endpoints is different through
+           controller revision.
+
+           Say "y" to link the driver statically, or "m" to build a
+           dynamically linked module called "langwell_udc" and force all
+           gadget drivers to also be dynamically linked.
+
+config USB_LANGWELL
+        tristate
+        depends on USB_GADGET_LANGWELL
+        default USB_GADGET
+        select USB_GADGET_SELECTED
+
 
 #
 # LAST -- dummy/emulated controller
@@ -566,6 +601,20 @@ config USB_ZERO_HNPTEST
           the "B-Peripheral" role, that device will use HNP to let this
           one serve as the USB host instead (in the "B-Host" role).
 
+config USB_AUDIO
+        tristate "Audio Gadget (EXPERIMENTAL)"
+        depends on SND
+        help
+          Gadget Audio is compatible with USB Audio Class specification 1.0.
+          It will include at least one AudioControl interface, zero or more
+          AudioStream interface and zero or more MIDIStream interface.
+
+          Gadget Audio will use on-board ALSA (CONFIG_SND) audio card to
+          playback or capture audio stream.
+
+          Say "y" to link the driver statically, or "m" to build a
+          dynamically linked module called "g_audio".
+
 config USB_ETH
         tristate "Ethernet Gadget (with CDC Ethernet support)"
         depends on NET
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 39a51d746cb7..e6017e6bf6da 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -18,14 +18,21 @@ obj-$(CONFIG_USB_S3C2410)	+= s3c2410_udc.o
 obj-$(CONFIG_USB_AT91)          += at91_udc.o
 obj-$(CONFIG_USB_ATMEL_USBA)    += atmel_usba_udc.o
 obj-$(CONFIG_USB_FSL_USB2)      += fsl_usb2_udc.o
+fsl_usb2_udc-objs               := fsl_udc_core.o
+ifeq ($(CONFIG_ARCH_MXC),y)
+fsl_usb2_udc-objs               += fsl_mx3_udc.o
+endif
 obj-$(CONFIG_USB_M66592)        += m66592-udc.o
 obj-$(CONFIG_USB_FSL_QE)        += fsl_qe_udc.o
 obj-$(CONFIG_USB_CI13XXX)       += ci13xxx_udc.o
+obj-$(CONFIG_USB_S3C_HSOTG)     += s3c-hsotg.o
+obj-$(CONFIG_USB_LANGWELL)      += langwell_udc.o
 
 #
 # USB gadget drivers
 #
 g_zero-objs                     := zero.o
+g_audio-objs                    := audio.o
 g_ether-objs                    := ether.o
 g_serial-objs                   := serial.o
 g_midi-objs                     := gmidi.o
@@ -35,6 +42,7 @@ g_printer-objs			:= printer.o
 g_cdc-objs                      := cdc2.o
 
 obj-$(CONFIG_USB_ZERO)          += g_zero.o
+obj-$(CONFIG_USB_AUDIO)         += g_audio.o
 obj-$(CONFIG_USB_ETH)           += g_ether.o
 obj-$(CONFIG_USB_GADGETFS)      += gadgetfs.o
 obj-$(CONFIG_USB_FILE_STORAGE)  += g_file_storage.o
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 53bcdd2f8282..72bae8f39d81 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -485,7 +485,7 @@ static int at91_ep_enable(struct usb_ep *_ep,
                 return -ESHUTDOWN;
         }
 
-        tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+        tmp = usb_endpoint_type(desc);
         switch (tmp) {
         case USB_ENDPOINT_XFER_CONTROL:
                 DBG("only one control endpoint\n");
@@ -517,7 +517,7 @@ ok:
         local_irq_save(flags);
 
         /* initialize endpoint to match this descriptor */
-        ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
+        ep->is_in = usb_endpoint_dir_in(desc);
         ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
         ep->stopped = 0;
         if (ep->is_in)
diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
index 05c913cc3658..4e970cf0e29a 100644
--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -326,13 +326,7 @@ static int vbus_is_present(struct usba_udc *udc)
         return 1;
 }
 
-#if defined(CONFIG_AVR32)
-
-static void toggle_bias(int is_on)
-{
-}
-
-#elif defined(CONFIG_ARCH_AT91)
+#if defined(CONFIG_ARCH_AT91SAM9RL)
 
 #include <mach/at91_pmc.h>
 
@@ -346,7 +340,13 @@ static void toggle_bias(int is_on)
                 at91_sys_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
 }
 
-#endif /* CONFIG_ARCH_AT91 */
+#else
+
+static void toggle_bias(int is_on)
+{
+}
+
+#endif /* CONFIG_ARCH_AT91SAM9RL */
 
 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 {
@@ -550,12 +550,12 @@ usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
         DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
                         ep->ep.name, ept_cfg, maxpacket);
 
-        if ((desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
+        if (usb_endpoint_dir_in(desc)) {
                 ep->is_in = 1;
                 ept_cfg |= USBA_EPT_DIR_IN;
         }
 
-        switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+        switch (usb_endpoint_type(desc)) {
         case USB_ENDPOINT_XFER_CONTROL:
                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
diff --git a/drivers/usb/gadget/audio.c b/drivers/usb/gadget/audio.c
new file mode 100644
index 000000000000..94de7e864614
--- /dev/null
+++ b/drivers/usb/gadget/audio.c
@@ -0,0 +1,302 @@
+/*
+ * audio.c -- Audio gadget driver
+ *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+/* #define VERBOSE_DEBUG */
+
+#include <linux/kernel.h>
+#include <linux/utsname.h>
+
+#include "u_audio.h"
+
+#define DRIVER_DESC             "Linux USB Audio Gadget"
+#define DRIVER_VERSION          "Dec 18, 2008"
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Kbuild is not very cooperative with respect to linking separately
+ * compiled library objects into one module.  So for now we won't use
+ * separate compilation ... ensuring init/exit sections work to shrink
+ * the runtime footprint, and giving us at least some parts of what
+ * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
+ */
+#include "composite.c"
+#include "usbstring.c"
+#include "config.c"
+#include "epautoconf.c"
+
+#include "u_audio.c"
+#include "f_audio.c"
+
+/*-------------------------------------------------------------------------*/
+
+/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
+ * Instead:  allocate your own, using normal USB-IF procedures.
+ */
+
+/* Thanks to NetChip Technologies for donating this product ID. */
+#define AUDIO_VENDOR_NUM                0x0525  /* NetChip */
+#define AUDIO_PRODUCT_NUM               0xa4a1  /* Linux-USB Audio Gadget */
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_device_descriptor device_desc = {
+        .bLength =              sizeof device_desc,
+        .bDescriptorType =      USB_DT_DEVICE,
+
+        .bcdUSB =               __constant_cpu_to_le16(0x200),
+
+        .bDeviceClass =         USB_CLASS_PER_INTERFACE,
+        .bDeviceSubClass =      0,
+        .bDeviceProtocol =      0,
+        /* .bMaxPacketSize0 = f(hardware) */
+
+        /* Vendor and product id defaults change according to what configs
+         * we support.  (As does bNumConfigurations.)  These values can
+         * also be overridden by module parameters.
+         */
+        .idVendor =             __constant_cpu_to_le16(AUDIO_VENDOR_NUM),
+        .idProduct =            __constant_cpu_to_le16(AUDIO_PRODUCT_NUM),
+        /* .bcdDevice = f(hardware) */
+        /* .iManufacturer = DYNAMIC */
+        /* .iProduct = DYNAMIC */
+        /* NO SERIAL NUMBER */
+        .bNumConfigurations =   1,
+};
+
+static struct usb_otg_descriptor otg_descriptor = {
+        .bLength =              sizeof otg_descriptor,
+        .bDescriptorType =      USB_DT_OTG,
+
+        /* REVISIT SRP-only hardware is possible, although
+         * it would not be called "OTG" ...
+         */
+        .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
+};
+
+static const struct usb_descriptor_header *otg_desc[] = {
+        (struct usb_descriptor_header *) &otg_descriptor,
+        NULL,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * Handle USB audio endpoint set/get command in setup class request
+ */
+
+static int audio_set_endpoint_req(struct usb_configuration *c,
+                const struct usb_ctrlrequest *ctrl)
+{
+        struct usb_composite_dev *cdev = c->cdev;
+        int                     value = -EOPNOTSUPP;
+        u16                     ep = le16_to_cpu(ctrl->wIndex);
+        u16                     len = le16_to_cpu(ctrl->wLength);
+        u16                     w_value = le16_to_cpu(ctrl->wValue);
+
+        DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+                        ctrl->bRequest, w_value, len, ep);
+
+        switch (ctrl->bRequest) {
+        case SET_CUR:
+                value = 0;
+                break;
+
+        case SET_MIN:
+                break;
+
+        case SET_MAX:
+                break;
+
+        case SET_RES:
+                break;
+
+        case SET_MEM:
+                break;
+
+        default:
+                break;
+        }
+
+        return value;
+}
+
+static int audio_get_endpoint_req(struct usb_configuration *c,
+                const struct usb_ctrlrequest *ctrl)
+{
+        struct usb_composite_dev *cdev = c->cdev;
+        int value = -EOPNOTSUPP;
+        u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+        u16 len = le16_to_cpu(ctrl->wLength);
+        u16 w_value = le16_to_cpu(ctrl->wValue);
+
+        DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+                        ctrl->bRequest, w_value, len, ep);
+
+        switch (ctrl->bRequest) {
+        case GET_CUR:
+        case GET_MIN:
+        case GET_MAX:
+        case GET_RES:
+                value = 3;
+                break;
+        case GET_MEM:
+                break;
+        default:
+                break;
+        }
+
+        return value;
+}
+
+static int
+audio_setup(struct usb_configuration *c, const struct usb_ctrlrequest *ctrl)
+{
+        struct usb_composite_dev *cdev = c->cdev;
+        struct usb_request *req = cdev->req;
+        int value = -EOPNOTSUPP;
+        u16 w_index = le16_to_cpu(ctrl->wIndex);
+        u16 w_value = le16_to_cpu(ctrl->wValue);
+        u16 w_length = le16_to_cpu(ctrl->wLength);
+
+        /* composite driver infrastructure handles everything except
+         * Audio class messages; interface activation uses set_alt().
+         */
+        switch (ctrl->bRequestType) {
+        case USB_AUDIO_SET_ENDPOINT:
+                value = audio_set_endpoint_req(c, ctrl);
+                break;
+
+        case USB_AUDIO_GET_ENDPOINT:
+                value = audio_get_endpoint_req(c, ctrl);
+                break;
+
+        default:
+                ERROR(cdev, "Invalid control req%02x.%02x v%04x i%04x l%d\n",
+                        ctrl->bRequestType, ctrl->bRequest,
+                        w_value, w_index, w_length);
+        }
+
+        /* respond with data transfer or status phase? */
+        if (value >= 0) {
+                DBG(cdev, "Audio req%02x.%02x v%04x i%04x l%d\n",
+                        ctrl->bRequestType, ctrl->bRequest,
+                        w_value, w_index, w_length);
+                req->zero = 0;
+                req->length = value;
+                value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+                if (value < 0)
+                        ERROR(cdev, "Audio response on err %d\n", value);
+        }
+
+        /* device either stalls (value < 0) or reports success */
+        return value;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int __init audio_do_config(struct usb_configuration *c)
+{
+        /* FIXME alloc iConfiguration string, set it in c->strings */
+
+        if (gadget_is_otg(c->cdev->gadget)) {
+                c->descriptors = otg_desc;
+                c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+        }
+
+        audio_bind_config(c);
+
+        return 0;
+}
+
+static struct usb_configuration audio_config_driver = {
+        .label                  = DRIVER_DESC,
+        .bind                   = audio_do_config,
+        .setup                  = audio_setup,
+        .bConfigurationValue    = 1,
+        /* .iConfiguration = DYNAMIC */
+        .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int __init audio_bind(struct usb_composite_dev *cdev)
+{
+        int                     gcnum;
+        int                     status;
+
+        gcnum = usb_gadget_controller_number(cdev->gadget);
+        if (gcnum >= 0)
+                device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
+        else {
+                ERROR(cdev, "controller '%s' not recognized; trying %s\n",
+                        cdev->gadget->name,
+                        audio_config_driver.label);
+                device_desc.bcdDevice =
+                        __constant_cpu_to_le16(0x0300 | 0x0099);
+        }
+
+        /* device descriptor strings: manufacturer, product */
+        snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
+                init_utsname()->sysname, init_utsname()->release,
+                cdev->gadget->name);
+        status = usb_string_id(cdev);
+        if (status < 0)
+                goto fail;
+        strings_dev[STRING_MANUFACTURER_IDX].id = status;
+        device_desc.iManufacturer = status;
+
+        status = usb_string_id(cdev);
+        if (status < 0)
+                goto fail;
+        strings_dev[STRING_PRODUCT_IDX].id = status;
+        device_desc.iProduct = status;
+
+        status = usb_add_config(cdev, &audio_config_driver);
+        if (status < 0)
+                goto fail;
+
+        INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
+        return 0;
+
+fail:
+        return status;
+}
+
+static int __exit audio_unbind(struct usb_composite_dev *cdev)
+{
+        return 0;
+}
+
+static struct usb_composite_driver audio_driver = {
+        .name           = "g_audio",
+        .dev            = &device_desc,
+        .strings        = audio_strings,
+        .bind           = audio_bind,
+        .unbind         = __exit_p(audio_unbind),
+};
+
+static int __init init(void)
+{
+        return usb_composite_register(&audio_driver);
+}
+module_init(init);
+
+static void __exit cleanup(void)
+{
+        usb_composite_unregister(&audio_driver);
+}
+module_exit(cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>");
+MODULE_LICENSE("GPL");
+
diff --git a/drivers/usb/gadget/ci13xxx_udc.c b/drivers/usb/gadget/ci13xxx_udc.c
index 38e531ecae4d..c7cb87a6fee2 100644
--- a/drivers/usb/gadget/ci13xxx_udc.c
+++ b/drivers/usb/gadget/ci13xxx_udc.c
@@ -1977,9 +1977,9 @@ static int ep_enable(struct usb_ep *ep,
         if (!list_empty(&mEp->qh[mEp->dir].queue))
                 warn("enabling a non-empty endpoint!");
 
-        mEp->dir  = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? TX : RX;
-        mEp->num  =  desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
-        mEp->type =  desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+        mEp->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
+        mEp->num  = usb_endpoint_num(desc);
+        mEp->type = usb_endpoint_type(desc);
 
         mEp->ep.maxpacket = __constant_le16_to_cpu(desc->wMaxPacketSize);
 
diff --git a/drivers/usb/gadget/f_audio.c b/drivers/usb/gadget/f_audio.c
new file mode 100644
index 000000000000..66527ba2d2ea
--- /dev/null
+++ b/drivers/usb/gadget/f_audio.c
@@ -0,0 +1,707 @@
+/*
+ * f_audio.c -- USB Audio class function driver
+  *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <asm/atomic.h>
+
+#include "u_audio.h"
+
+#define OUT_EP_MAX_PACKET_SIZE  200
+static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
+module_param(req_buf_size, int, S_IRUGO);
+MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
+
+static int req_count = 256;
+module_param(req_count, int, S_IRUGO);
+MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
+
+static int audio_buf_size = 48000;
+module_param(audio_buf_size, int, S_IRUGO);
+MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
+
+/*
+ * DESCRIPTORS ... most are static, but strings and full
+ * configuration descriptors are built on demand.
+ */
+
+/*
+ * We have two interfaces- AudioControl and AudioStreaming
+ * TODO: only supcard playback currently
+ */
+#define F_AUDIO_AC_INTERFACE    0
+#define F_AUDIO_AS_INTERFACE    1
+#define F_AUDIO_NUM_INTERFACES  2
+
+/* B.3.1  Standard AC Interface Descriptor */
+static struct usb_interface_descriptor ac_interface_desc __initdata = {
+        .bLength =              USB_DT_INTERFACE_SIZE,
+        .bDescriptorType =      USB_DT_INTERFACE,
+        .bNumEndpoints =        0,
+        .bInterfaceClass =      USB_CLASS_AUDIO,
+        .bInterfaceSubClass =   USB_SUBCLASS_AUDIOCONTROL,
+};
+
+DECLARE_USB_AC_HEADER_DESCRIPTOR(2);
+
+#define USB_DT_AC_HEADER_LENGH  USB_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
+/* B.3.2  Class-Specific AC Interface Descriptor */
+static struct usb_ac_header_descriptor_2 ac_header_desc = {
+        .bLength =              USB_DT_AC_HEADER_LENGH,
+        .bDescriptorType =      USB_DT_CS_INTERFACE,
+        .bDescriptorSubtype =   HEADER,
+        .bcdADC =               __constant_cpu_to_le16(0x0100),
+        .wTotalLength =         __constant_cpu_to_le16(USB_DT_AC_HEADER_LENGH),
+        .bInCollection =        F_AUDIO_NUM_INTERFACES,
+        .baInterfaceNr = {
+                [0] =           F_AUDIO_AC_INTERFACE,
+                [1] =           F_AUDIO_AS_INTERFACE,
+        }
+};
+
+#define INPUT_TERMINAL_ID       1
+static struct usb_input_terminal_descriptor input_terminal_desc = {
+        .bLength =              USB_DT_AC_INPUT_TERMINAL_SIZE,
+        .bDescriptorType =      USB_DT_CS_INTERFACE,
+        .bDescriptorSubtype =   INPUT_TERMINAL,
+        .bTerminalID =          INPUT_TERMINAL_ID,
+        .wTerminalType =        USB_AC_TERMINAL_STREAMING,
+        .bAssocTerminal =       0,
+        .wChannelConfig =       0x3,
+};
+
+DECLARE_USB_AC_FEATURE_UNIT_DESCRIPTOR(0);
+
+#define FEATURE_UNIT_ID         2
+static struct usb_ac_feature_unit_descriptor_0 feature_unit_desc = {
+        .bLength                = USB_DT_AC_FEATURE_UNIT_SIZE(0),
+        .bDescriptorType        = USB_DT_CS_INTERFACE,
+        .bDescriptorSubtype     = FEATURE_UNIT,
+        .bUnitID                = FEATURE_UNIT_ID,
+        .bSourceID              = INPUT_TERMINAL_ID,
+        .bControlSize           = 2,
+        .bmaControls[0]         = (FU_MUTE | FU_VOLUME),
+};
+
+static struct usb_audio_control mute_control = {
+        .list = LIST_HEAD_INIT(mute_control.list),
+        .name = "Mute Control",
+        .type = MUTE_CONTROL,
+        /* Todo: add real Mute control code */
+        .set = generic_set_cmd,
+        .get = generic_get_cmd,
+};
+
+static struct usb_audio_control volume_control = {
+        .list = LIST_HEAD_INIT(volume_control.list),
+        .name = "Volume Control",
+        .type = VOLUME_CONTROL,
+        /* Todo: add real Volume control code */
+        .set = generic_set_cmd,
+        .get = generic_get_cmd,
+};
+
+static struct usb_audio_control_selector feature_unit = {
+        .list = LIST_HEAD_INIT(feature_unit.list),
+        .id = FEATURE_UNIT_ID,
+        .name = "Mute & Volume Control",
+        .type = FEATURE_UNIT,
+        .desc = (struct usb_descriptor_header *)&feature_unit_desc,
+};
+
+#define OUTPUT_TERMINAL_ID      3
+static struct usb_output_terminal_descriptor output_terminal_desc = {
+        .bLength                = USB_DT_AC_OUTPUT_TERMINAL_SIZE,
+        .bDescriptorType        = USB_DT_CS_INTERFACE,
+        .bDescriptorSubtype     = OUTPUT_TERMINAL,
+        .bTerminalID            = OUTPUT_TERMINAL_ID,
+        .wTerminalType          = USB_AC_OUTPUT_TERMINAL_SPEAKER,
+        .bAssocTerminal         = FEATURE_UNIT_ID,
+        .bSourceID              = FEATURE_UNIT_ID,
+};
+
+/* B.4.1  Standard AS Interface Descriptor */
+static struct usb_interface_descriptor as_interface_alt_0_desc = {
+        .bLength =              USB_DT_INTERFACE_SIZE,
+        .bDescriptorType =      USB_DT_INTERFACE,
+        .bAlternateSetting =    0,
+        .bNumEndpoints =        0,
+        .bInterfaceClass =      USB_CLASS_AUDIO,
+        .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+static struct usb_interface_descriptor as_interface_alt_1_desc = {
+        .bLength =              USB_DT_INTERFACE_SIZE,
+        .bDescriptorType =      USB_DT_INTERFACE,
+        .bAlternateSetting =    1,
+        .bNumEndpoints =        1,
+        .bInterfaceClass =      USB_CLASS_AUDIO,
+        .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+/* B.4.2  Class-Specific AS Interface Descriptor */
+static struct usb_as_header_descriptor as_header_desc = {
+        .bLength =              USB_DT_AS_HEADER_SIZE,
+        .bDescriptorType =      USB_DT_CS_INTERFACE,
+        .bDescriptorSubtype =   AS_GENERAL,
+        .bTerminalLink =        INPUT_TERMINAL_ID,
+        .bDelay =               1,
+        .wFormatTag =           USB_AS_AUDIO_FORMAT_TYPE_I_PCM,
+};
+
+DECLARE_USB_AS_FORMAT_TYPE_I_DISCRETE_DESC(1);
+
+static struct usb_as_formate_type_i_discrete_descriptor_1 as_type_i_desc = {
+        .bLength =              USB_AS_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
+        .bDescriptorType =      USB_DT_CS_INTERFACE,
+        .bDescriptorSubtype =   FORMAT_TYPE,
+        .bFormatType =          USB_AS_FORMAT_TYPE_I,
+        .bSubframeSize =        2,
+        .bBitResolution =       16,
+        .bSamFreqType =         1,
+};
+
+/* Standard ISO OUT Endpoint Descriptor */
+static struct usb_endpoint_descriptor as_out_ep_desc __initdata = {
+        .bLength =              USB_DT_ENDPOINT_AUDIO_SIZE,
+        .bDescriptorType =      USB_DT_ENDPOINT,
+        .bEndpointAddress =     USB_DIR_OUT,
+        .bmAttributes =         USB_AS_ENDPOINT_ADAPTIVE
+                                | USB_ENDPOINT_XFER_ISOC,
+        .wMaxPacketSize =       __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
+        .bInterval =            4,
+};
+
+/* Class-specific AS ISO OUT Endpoint Descriptor */
+static struct usb_as_iso_endpoint_descriptor as_iso_out_desc __initdata = {
+        .bLength =              USB_AS_ISO_ENDPOINT_DESC_SIZE,
+        .bDescriptorType =      USB_DT_CS_ENDPOINT,
+        .bDescriptorSubtype =   EP_GENERAL,
+        .bmAttributes =         1,
+        .bLockDelayUnits =      1,
+        .wLockDelay =           __constant_cpu_to_le16(1),
+};
+
+static struct usb_descriptor_header *f_audio_desc[] __initdata = {
+        (struct usb_descriptor_header *)&ac_interface_desc,
+        (struct usb_descriptor_header *)&ac_header_desc,
+
+        (struct usb_descriptor_header *)&input_terminal_desc,
+        (struct usb_descriptor_header *)&output_terminal_desc,
+        (struct usb_descriptor_header *)&feature_unit_desc,
+
+        (struct usb_descriptor_header *)&as_interface_alt_0_desc,
+        (struct usb_descriptor_header *)&as_interface_alt_1_desc,
+        (struct usb_descriptor_header *)&as_header_desc,
+
+        (struct usb_descriptor_header *)&as_type_i_desc,
+
+        (struct usb_descriptor_header *)&as_out_ep_desc,
+        (struct usb_descriptor_header *)&as_iso_out_desc,
+        NULL,
+};
+
+/* string IDs are assigned dynamically */
+
+#define STRING_MANUFACTURER_IDX         0
+#define STRING_PRODUCT_IDX              1
+
+static char manufacturer[50];
+
+static struct usb_string strings_dev[] = {
+        [STRING_MANUFACTURER_IDX].s = manufacturer,
+        [STRING_PRODUCT_IDX].s = DRIVER_DESC,
+        {  } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_dev = {
+        .language       = 0x0409,       /* en-us */
+        .strings        = strings_dev,
+};
+
+static struct usb_gadget_strings *audio_strings[] = {
+        &stringtab_dev,
+        NULL,
+};
+
+/*
+ * This function is an ALSA sound card following USB Audio Class Spec 1.0.
+ */
+
+/*-------------------------------------------------------------------------*/
+struct f_audio_buf {
+        u8 *buf;
+        int actual;
+        struct list_head list;
+};
+
+static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
+{
+        struct f_audio_buf *copy_buf;
+
+        copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
+        if (!copy_buf)
+                return (struct f_audio_buf *)-ENOMEM;
+
+        copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
+        if (!copy_buf->buf) {
+                kfree(copy_buf);
+                return (struct f_audio_buf *)-ENOMEM;
+        }
+
+        return copy_buf;
+}
+
+static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
+{
+        kfree(audio_buf->buf);
+        kfree(audio_buf);
+}
+/*-------------------------------------------------------------------------*/
+
+struct f_audio {
+        struct gaudio                   card;
+
+        /* endpoints handle full and/or high speeds */
+        struct usb_ep                   *out_ep;
+        struct usb_endpoint_descriptor  *out_desc;
+
+        spinlock_t                      lock;
+        struct f_audio_buf *copy_buf;
+        struct work_struct playback_work;
+        struct list_head play_queue;
+
+        /* Control Set command */
+        struct list_head cs;
+        u8 set_cmd;
+        struct usb_audio_control *set_con;
+};
+
+static inline struct f_audio *func_to_audio(struct usb_function *f)
+{
+        return container_of(f, struct f_audio, card.func);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void f_audio_playback_work(struct work_struct *data)
+{
+        struct f_audio *audio = container_of(data, struct f_audio,
+                                        playback_work);
+        struct f_audio_buf *play_buf;
+
+        spin_lock_irq(&audio->lock);
+        if (list_empty(&audio->play_queue)) {
+                spin_unlock_irq(&audio->lock);
+                return;
+        }
+        play_buf = list_first_entry(&audio->play_queue,
+                        struct f_audio_buf, list);
+        list_del(&play_buf->list);
+        spin_unlock_irq(&audio->lock);
+
+        u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
+        f_audio_buffer_free(play_buf);
+
+        return;
+}
+
+static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
+{
+        struct f_audio *audio = req->context;
+        struct usb_composite_dev *cdev = audio->card.func.config->cdev;
+        struct f_audio_buf *copy_buf = audio->copy_buf;
+        int err;
+
+        if (!copy_buf)
+                return -EINVAL;
+
+        /* Copy buffer is full, add it to the play_queue */
+        if (audio_buf_size - copy_buf->actual < req->actual) {
+                list_add_tail(&copy_buf->list, &audio->play_queue);
+                schedule_work(&audio->playback_work);
+                copy_buf = f_audio_buffer_alloc(audio_buf_size);
+                if (copy_buf < 0)
+                        return -ENOMEM;
+        }
+
+        memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
+        copy_buf->actual += req->actual;
+        audio->copy_buf = copy_buf;
+
+        err = usb_ep_queue(ep, req, GFP_ATOMIC);
+        if (err)
+                ERROR(cdev, "%s queue req: %d\n", ep->name, err);
+
+        return 0;
+
+}
+
+static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
+{
+        struct f_audio *audio = req->context;
+        int status = req->status;
+        u32 data = 0;
+        struct usb_ep *out_ep = audio->out_ep;
+
+        switch (status) {
+
+        case 0:                         /* normal completion? */
+                if (ep == out_ep)
+                        f_audio_out_ep_complete(ep, req);
+                else if (audio->set_con) {
+                        memcpy(&data, req->buf, req->length);
+                        audio->set_con->set(audio->set_con, audio->set_cmd,
+                                        le16_to_cpu(data));
+                        audio->set_con = NULL;
+                }
+                break;
+        default:
+                break;
+        }
+}
+
+static int audio_set_intf_req(struct usb_function *f,
+                const struct usb_ctrlrequest *ctrl)
+{
+        struct f_audio          *audio = func_to_audio(f);
+        struct usb_composite_dev *cdev = f->config->cdev;
+        struct usb_request      *req = cdev->req;
+        u8                      id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+        u16                     len = le16_to_cpu(ctrl->wLength);
+        u16                     w_value = le16_to_cpu(ctrl->wValue);
+        u8                      con_sel = (w_value >> 8) & 0xFF;
+        u8                      cmd = (ctrl->bRequest & 0x0F);
+        struct usb_audio_control_selector *cs;
+        struct usb_audio_control *con;
+
+        DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
+                        ctrl->bRequest, w_value, len, id);
+
+        list_for_each_entry(cs, &audio->cs, list) {
+                if (cs->id == id) {
+                        list_for_each_entry(con, &cs->control, list) {
+                                if (con->type == con_sel) {
+                                        audio->set_con = con;
+                                        break;
+                                }
+                        }
+                        break;
+                }
+        }
+
+        audio->set_cmd = cmd;
+        req->context = audio;
+        req->complete = f_audio_complete;
+
+        return len;
+}
+
+static int audio_get_intf_req(struct usb_function *f,
+                const struct usb_ctrlrequest *ctrl)
+{
+        struct f_audio          *audio = func_to_audio(f);
+        struct usb_composite_dev *cdev = f->config->cdev;
+        struct usb_request      *req = cdev->req;
+        int                     value = -EOPNOTSUPP;
+        u8                      id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+        u16                     len = le16_to_cpu(ctrl->wLength);
+        u16                     w_value = le16_to_cpu(ctrl->wValue);
+        u8                      con_sel = (w_value >> 8) & 0xFF;
+        u8                      cmd = (ctrl->bRequest & 0x0F);
+        struct usb_audio_control_selector *cs;
+        struct usb_audio_control *con;
+
+        DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
+                        ctrl->bRequest, w_value, len, id);
+
+        list_for_each_entry(cs, &audio->cs, list) {
+                if (cs->id == id) {
+                        list_for_each_entry(con, &cs->control, list) {
+                                if (con->type == con_sel && con->get) {
+                                        value = con->get(con, cmd);
+                                        break;
+                                }
+                        }
+                        break;
+                }
+        }
+
+        req->context = audio;
+        req->complete = f_audio_complete;
+        memcpy(req->buf, &value, len);
+
+        return len;
+}
+
+static int
+f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
+{
+        struct usb_composite_dev *cdev = f->config->cdev;
+        struct usb_request      *req = cdev->req;
+        int                     value = -EOPNOTSUPP;
+        u16                     w_index = le16_to_cpu(ctrl->wIndex);
+        u16                     w_value = le16_to_cpu(ctrl->wValue);
+        u16                     w_length = le16_to_cpu(ctrl->wLength);
+
+        /* composite driver infrastructure handles everything except
+         * Audio class messages; interface activation uses set_alt().
+         */
+        switch (ctrl->bRequestType) {
+        case USB_AUDIO_SET_INTF:
+                value = audio_set_intf_req(f, ctrl);
+                break;
+
+        case USB_AUDIO_GET_INTF:
+                value = audio_get_intf_req(f, ctrl);
+                break;
+
+        default:
+                ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
+                        ctrl->bRequestType, ctrl->bRequest,
+                        w_value, w_index, w_length);
+        }
+
+        /* respond with data transfer or status phase? */
+        if (value >= 0) {
+                DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
+                        ctrl->bRequestType, ctrl->bRequest,
+                        w_value, w_index, w_length);
+                req->zero = 0;
+                req->length = value;
+                value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+                if (value < 0)
+                        ERROR(cdev, "audio response on err %d\n", value);
+        }
+
+        /* device either stalls (value < 0) or reports success */
+        return value;
+}
+
+static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+        struct f_audio          *audio = func_to_audio(f);
+        struct usb_composite_dev *cdev = f->config->cdev;
+        struct usb_ep *out_ep = audio->out_ep;
+        struct usb_request *req;
+        int i = 0, err = 0;
+
+        DBG(cdev, "intf %d, alt %d\n", intf, alt);
+
+        if (intf == 1) {
+                if (alt == 1) {
+                        usb_ep_enable(out_ep, audio->out_desc);
+                        out_ep->driver_data = audio;
+                        audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
+
+                        /*
+                         * allocate a bunch of read buffers
+                         * and queue them all at once.
+                         */
+                        for (i = 0; i < req_count && err == 0; i++) {
+                                req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
+                                if (req) {
+                                        req->buf = kzalloc(req_buf_size,
+                                                        GFP_ATOMIC);
+                                        if (req->buf) {
+                                                req->length = req_buf_size;
+                                                req->context = audio;
+                                                req->complete =
+                                                        f_audio_complete;
+                                                err = usb_ep_queue(out_ep,
+                                                        req, GFP_ATOMIC);
+                                                if (err)
+                                                        ERROR(cdev,
+                                                        "%s queue req: %d\n",
+                                                        out_ep->name, err);
+                                        } else
+                                                err = -ENOMEM;
+                                } else
+                                        err = -ENOMEM;
+                        }
+
+                } else {
+                        struct f_audio_buf *copy_buf = audio->copy_buf;
+                        if (copy_buf) {
+                                list_add_tail(&copy_buf->list,
+                                                &audio->play_queue);
+                                schedule_work(&audio->playback_work);
+                        }
+                }
+        }
+
+        return err;
+}
+
+static void f_audio_disable(struct usb_function *f)
+{
+        return;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void f_audio_build_desc(struct f_audio *audio)
+{
+        struct gaudio *card = &audio->card;
+        u8 *sam_freq;
+        int rate;
+
+        /* Set channel numbers */
+        input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
+        as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
+
+        /* Set sample rates */
+        rate = u_audio_get_playback_rate(card);
+        sam_freq = as_type_i_desc.tSamFreq[0];
+        memcpy(sam_freq, &rate, 3);
+
+        /* Todo: Set Sample bits and other parameters */
+
+        return;
+}
+
+/* audio function driver setup/binding */
+static int __init
+f_audio_bind(struct usb_configuration *c, struct usb_function *f)
+{
+        struct usb_composite_dev *cdev = c->cdev;
+        struct f_audio          *audio = func_to_audio(f);
+        int                     status;
+        struct usb_ep           *ep;
+
+        f_audio_build_desc(audio);
+
+        /* allocate instance-specific interface IDs, and patch descriptors */
+        status = usb_interface_id(c, f);
+        if (status < 0)
+                goto fail;
+        ac_interface_desc.bInterfaceNumber = status;
+
+        status = usb_interface_id(c, f);
+        if (status < 0)
+                goto fail;
+        as_interface_alt_0_desc.bInterfaceNumber = status;
+        as_interface_alt_1_desc.bInterfaceNumber = status;
+
+        status = -ENODEV;
+
+        /* allocate instance-specific endpoints */
+        ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
+        if (!ep)
+                goto fail;
+        audio->out_ep = ep;
+        ep->driver_data = cdev; /* claim */
+
+        status = -ENOMEM;
+
+        /* supcard all relevant hardware speeds... we expect that when
+         * hardware is dual speed, all bulk-capable endpoints work at
+         * both speeds
+         */
+
+        /* copy descriptors, and track endpoint copies */
+        if (gadget_is_dualspeed(c->cdev->gadget)) {
+                c->highspeed = true;
+                f->hs_descriptors = usb_copy_descriptors(f_audio_desc);
+        } else
+                f->descriptors = usb_copy_descriptors(f_audio_desc);
+
+        return 0;
+
+fail:
+
+        return status;
+}
+
+static void
+f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+        struct f_audio          *audio = func_to_audio(f);
+
+        usb_free_descriptors(f->descriptors);
+        kfree(audio);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* Todo: add more control selecotor dynamically */
+int __init control_selector_init(struct f_audio *audio)
+{
+        INIT_LIST_HEAD(&audio->cs);
+        list_add(&feature_unit.list, &audio->cs);
+
+        INIT_LIST_HEAD(&feature_unit.control);
+        list_add(&mute_control.list, &feature_unit.control);
+        list_add(&volume_control.list, &feature_unit.control);
+
+        volume_control.data[_CUR] = 0xffc0;
+        volume_control.data[_MIN] = 0xe3a0;
+        volume_control.data[_MAX] = 0xfff0;
+        volume_control.data[_RES] = 0x0030;
+
+        return 0;
+}
+
+/**
+ * audio_bind_config - add USB audio fucntion to a configuration
+ * @c: the configuration to supcard the USB audio function
+ * Context: single threaded during gadget setup
+ *
+ * Returns zero on success, else negative errno.
+ */
+int __init audio_bind_config(struct usb_configuration *c)
+{
+        struct f_audio *audio;
+        int status;
+
+        /* allocate and initialize one new instance */
+        audio = kzalloc(sizeof *audio, GFP_KERNEL);
+        if (!audio)
+                return -ENOMEM;
+
+        audio->card.func.name = "g_audio";
+        audio->card.gadget = c->cdev->gadget;
+
+        INIT_LIST_HEAD(&audio->play_queue);
+        spin_lock_init(&audio->lock);
+
+        /* set up ASLA audio devices */
+        status = gaudio_setup(&audio->card);
+        if (status < 0)
+                goto setup_fail;
+
+        audio->card.func.strings = audio_strings;
+        audio->card.func.bind = f_audio_bind;
+        audio->card.func.unbind = f_audio_unbind;
+        audio->card.func.set_alt = f_audio_set_alt;
+        audio->card.func.setup = f_audio_setup;
+        audio->card.func.disable = f_audio_disable;
+        audio->out_desc = &as_out_ep_desc;
+
+        control_selector_init(audio);
+
+        INIT_WORK(&audio->playback_work, f_audio_playback_work);
+
+        status = usb_add_function(c, &audio->card.func);
+        if (status)
+                goto add_fail;
+
+        INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
+                audio_buf_size, req_buf_size, req_count);
+
+        return status;
+
+add_fail:
+        gaudio_cleanup(&audio->card);
+setup_fail:
+        kfree(audio);
+        return status;
+}
diff --git a/drivers/usb/gadget/f_rndis.c b/drivers/usb/gadget/f_rndis.c
index 3279a4726042..424a37c5773f 100644
--- a/drivers/usb/gadget/f_rndis.c
+++ b/drivers/usb/gadget/f_rndis.c
@@ -475,7 +475,9 @@ static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
                 if (rndis->port.in_ep->driver_data) {
                         DBG(cdev, "reset rndis\n");
                         gether_disconnect(&rndis->port);
-                } else {
+                }
+
+                if (!rndis->port.in) {
                         DBG(cdev, "init rndis\n");
                         rndis->port.in = ep_choose(cdev->gadget,
                                         rndis->hs.in, rndis->fs.in);
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index 381a53b3e11c..1e6aa504d58a 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -248,6 +248,8 @@
 #include <linux/freezer.h>
 #include <linux/utsname.h>
 
+#include <asm/unaligned.h>
+
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 
@@ -799,29 +801,9 @@ static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
 
 /* Routines for unaligned data access */
 
-static u16 get_be16(u8 *buf)
-{
-        return ((u16) buf[0] << 8) | ((u16) buf[1]);
-}
-
-static u32 get_be32(u8 *buf)
-{
-        return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
-                        ((u32) buf[2] << 8) | ((u32) buf[3]);
-}
-
-static void put_be16(u8 *buf, u16 val)
-{
-        buf[0] = val >> 8;
-        buf[1] = val;
-}
-
-static void put_be32(u8 *buf, u32 val)
+static u32 get_unaligned_be24(u8 *buf)
 {
-        buf[0] = val >> 24;
-        buf[1] = val >> 16;
-        buf[2] = val >> 8;
-        buf[3] = val & 0xff;
+        return 0xffffff & (u32) get_unaligned_be32(buf - 1);
 }
 
 
@@ -1582,9 +1564,9 @@ static int do_read(struct fsg_dev *fsg)
         /* Get the starting Logical Block Address and check that it's
          * not too big */
         if (fsg->cmnd[0] == SC_READ_6)
-                lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
+                lba = get_unaligned_be24(&fsg->cmnd[1]);
         else {
-                lba = get_be32(&fsg->cmnd[2]);
+                lba = get_unaligned_be32(&fsg->cmnd[2]);
 
                 /* We allow DPO (Disable Page Out = don't save data in the
                  * cache) and FUA (Force Unit Access = don't read from the
@@ -1717,9 +1699,9 @@ static int do_write(struct fsg_dev *fsg)
         /* Get the starting Logical Block Address and check that it's
          * not too big */
         if (fsg->cmnd[0] == SC_WRITE_6)
-                lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
+                lba = get_unaligned_be24(&fsg->cmnd[1]);
         else {
-                lba = get_be32(&fsg->cmnd[2]);
+                lba = get_unaligned_be32(&fsg->cmnd[2]);
 
                 /* We allow DPO (Disable Page Out = don't save data in the
                  * cache) and FUA (Force Unit Access = write directly to the
@@ -1940,7 +1922,7 @@ static int do_verify(struct fsg_dev *fsg)
 
         /* Get the starting Logical Block Address and check that it's
          * not too big */
-        lba = get_be32(&fsg->cmnd[2]);
+        lba = get_unaligned_be32(&fsg->cmnd[2]);
         if (lba >= curlun->num_sectors) {
                 curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
                 return -EINVAL;
@@ -1953,7 +1935,7 @@ static int do_verify(struct fsg_dev *fsg)
                 return -EINVAL;
         }
 
-        verification_length = get_be16(&fsg->cmnd[7]);
+        verification_length = get_unaligned_be16(&fsg->cmnd[7]);
         if (unlikely(verification_length == 0))
                 return -EIO;            // No default reply
 
@@ -2103,7 +2085,7 @@ static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
         memset(buf, 0, 18);
         buf[0] = valid | 0x70;                  // Valid, current error
         buf[2] = SK(sd);
-        put_be32(&buf[3], sdinfo);              // Sense information
+        put_unaligned_be32(sdinfo, &buf[3]);    /* Sense information */
         buf[7] = 18 - 8;                        // Additional sense length
         buf[12] = ASC(sd);
         buf[13] = ASCQ(sd);
@@ -2114,7 +2096,7 @@ static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 {
         struct lun      *curlun = fsg->curlun;
-        u32             lba = get_be32(&fsg->cmnd[2]);
+        u32             lba = get_unaligned_be32(&fsg->cmnd[2]);
         int             pmi = fsg->cmnd[8];
         u8              *buf = (u8 *) bh->buf;
 
@@ -2124,8 +2106,9 @@ static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
                 return -EINVAL;
         }
 
-        put_be32(&buf[0], curlun->num_sectors - 1);     // Max logical block
-        put_be32(&buf[4], 512);                         // Block length
+        put_unaligned_be32(curlun->num_sectors - 1, &buf[0]);
+                                                /* Max logical block */
+        put_unaligned_be32(512, &buf[4]);       /* Block length */
         return 8;
 }
 
@@ -2144,7 +2127,7 @@ static void store_cdrom_address(u8 *dest, int msf, u32 addr)
                 dest[0] = 0;            /* Reserved */
         } else {
                 /* Absolute sector */
-                put_be32(dest, addr);
+                put_unaligned_be32(addr, dest);
         }
 }
 
@@ -2152,7 +2135,7 @@ static int do_read_header(struct fsg_dev *fsg, struct fsg_buffhd *bh)
 {
         struct lun      *curlun = fsg->curlun;
         int             msf = fsg->cmnd[1] & 0x02;
-        u32             lba = get_be32(&fsg->cmnd[2]);
+        u32             lba = get_unaligned_be32(&fsg->cmnd[2]);
         u8              *buf = (u8 *) bh->buf;
 
         if ((fsg->cmnd[1] & ~0x02) != 0) {              /* Mask away MSF */
@@ -2252,10 +2235,13 @@ static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
                         buf[2] = 0x04;  // Write cache enable,
                                         // Read cache not disabled
                                         // No cache retention priorities
-                        put_be16(&buf[4], 0xffff);  // Don't disable prefetch
-                                        // Minimum prefetch = 0
-                        put_be16(&buf[8], 0xffff);  // Maximum prefetch
-                        put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
+                        put_unaligned_be16(0xffff, &buf[4]);
+                                        /* Don't disable prefetch */
+                                        /* Minimum prefetch = 0 */
+                        put_unaligned_be16(0xffff, &buf[8]);
+                                        /* Maximum prefetch */
+                        put_unaligned_be16(0xffff, &buf[10]);
+                                        /* Maximum prefetch ceiling */
                 }
                 buf += 12;
         }
@@ -2272,7 +2258,7 @@ static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
         if (mscmnd == SC_MODE_SENSE_6)
                 buf0[0] = len - 1;
         else
-                put_be16(buf0, len - 2);
+                put_unaligned_be16(len - 2, buf0);
         return len;
 }
 
@@ -2360,9 +2346,10 @@ static int do_read_format_capacities(struct fsg_dev *fsg,
         buf[3] = 8;             // Only the Current/Maximum Capacity Descriptor
         buf += 4;
 
-        put_be32(&buf[0], curlun->num_sectors);         // Number of blocks
-        put_be32(&buf[4], 512);                         // Block length
-        buf[4] = 0x02;                                  // Current capacity
+        put_unaligned_be32(curlun->num_sectors, &buf[0]);
+                                                /* Number of blocks */
+        put_unaligned_be32(512, &buf[4]);       /* Block length */
+        buf[4] = 0x02;                          /* Current capacity */
         return 12;
 }
 
@@ -2882,7 +2869,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
                 break;
 
         case SC_MODE_SELECT_10:
-                fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+                fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
                 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
                                 (1<<1) | (3<<7), 0,
                                 "MODE SELECT(10)")) == 0)
@@ -2898,7 +2885,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
                 break;
 
         case SC_MODE_SENSE_10:
-                fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+                fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
                 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
                                 (1<<1) | (1<<2) | (3<<7), 0,
                                 "MODE SENSE(10)")) == 0)
@@ -2923,7 +2910,8 @@ static int do_scsi_command(struct fsg_dev *fsg)
                 break;
 
         case SC_READ_10:
-                fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
+                fsg->data_size_from_cmnd =
+                                get_unaligned_be16(&fsg->cmnd[7]) << 9;
                 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
                                 (1<<1) | (0xf<<2) | (3<<7), 1,
                                 "READ(10)")) == 0)
@@ -2931,7 +2919,8 @@ static int do_scsi_command(struct fsg_dev *fsg)
                 break;
 
         case SC_READ_12:
-                fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
+                fsg->data_size_from_cmnd =
+                                get_unaligned_be32(&fsg->cmnd[6]) << 9;
                 if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
                                 (1<<1) | (0xf<<2) | (0xf<<6), 1,
                                 "READ(12)")) == 0)
@@ -2949,7 +2938,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
         case SC_READ_HEADER:
                 if (!mod_data.cdrom)
                         goto unknown_cmnd;
-                fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+                fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
                 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
                                 (3<<7) | (0x1f<<1), 1,
                                 "READ HEADER")) == 0)
@@ -2959,7 +2948,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
         case SC_READ_TOC:
                 if (!mod_data.cdrom)
                         goto unknown_cmnd;
-                fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+                fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
                 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
                                 (7<<6) | (1<<1), 1,
                                 "READ TOC")) == 0)
@@ -2967,7 +2956,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
                 break;
 
         case SC_READ_FORMAT_CAPACITIES:
-                fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+                fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
                 if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
                                 (3<<7), 1,
                                 "READ FORMAT CAPACITIES")) == 0)
@@ -3025,7 +3014,8 @@ static int do_scsi_command(struct fsg_dev *fsg)
                 break;
 
         case SC_WRITE_10:
-                fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
+                fsg->data_size_from_cmnd =
+                                get_unaligned_be16(&fsg->cmnd[7]) << 9;
                 if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
                                 (1<<1) | (0xf<<2) | (3<<7), 1,
                                 "WRITE(10)")) == 0)
@@ -3033,7 +3023,8 @@ static int do_scsi_command(struct fsg_dev *fsg)
                 break;
 
         case SC_WRITE_12:
-                fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
+                fsg->data_size_from_cmnd =
+                                get_unaligned_be32(&fsg->cmnd[6]) << 9;
                 if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
                                 (1<<1) | (0xf<<2) | (0xf<<6), 1,
                                 "WRITE(12)")) == 0)
diff --git a/drivers/usb/gadget/fsl_mx3_udc.c b/drivers/usb/gadget/fsl_mx3_udc.c
new file mode 100644
index 000000000000..4bc2bf3d602e
--- /dev/null
+++ b/drivers/usb/gadget/fsl_mx3_udc.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2009
+ * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
+ *
+ * Description:
+ * Helper routines for i.MX3x SoCs from Freescale, needed by the fsl_usb2_udc.c
+ * driver to function correctly on these systems.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/fsl_devices.h>
+#include <linux/platform_device.h>
+
+static struct clk *mxc_ahb_clk;
+static struct clk *mxc_usb_clk;
+
+int fsl_udc_clk_init(struct platform_device *pdev)
+{
+        struct fsl_usb2_platform_data *pdata;
+        unsigned long freq;
+        int ret;
+
+        pdata = pdev->dev.platform_data;
+
+        mxc_ahb_clk = clk_get(&pdev->dev, "usb_ahb");
+        if (IS_ERR(mxc_ahb_clk))
+                return PTR_ERR(mxc_ahb_clk);
+
+        ret = clk_enable(mxc_ahb_clk);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "clk_enable(\"usb_ahb\") failed\n");
+                goto eenahb;
+        }
+
+        /* make sure USB_CLK is running at 60 MHz +/- 1000 Hz */
+        mxc_usb_clk = clk_get(&pdev->dev, "usb");
+        if (IS_ERR(mxc_usb_clk)) {
+                dev_err(&pdev->dev, "clk_get(\"usb\") failed\n");
+                ret = PTR_ERR(mxc_usb_clk);
+                goto egusb;
+        }
+
+        freq = clk_get_rate(mxc_usb_clk);
+        if (pdata->phy_mode != FSL_USB2_PHY_ULPI &&
+            (freq < 59999000 || freq > 60001000)) {
+                dev_err(&pdev->dev, "USB_CLK=%lu, should be 60MHz\n", freq);
+                goto eclkrate;
+        }
+
+        ret = clk_enable(mxc_usb_clk);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "clk_enable(\"usb_clk\") failed\n");
+                goto eenusb;
+        }
+
+        return 0;
+
+eenusb:
+eclkrate:
+        clk_put(mxc_usb_clk);
+        mxc_usb_clk = NULL;
+egusb:
+        clk_disable(mxc_ahb_clk);
+eenahb:
+        clk_put(mxc_ahb_clk);
+        return ret;
+}
+
+void fsl_udc_clk_finalize(struct platform_device *pdev)
+{
+        struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
+
+        /* ULPI transceivers don't need usbpll */
+        if (pdata->phy_mode == FSL_USB2_PHY_ULPI) {
+                clk_disable(mxc_usb_clk);
+                clk_put(mxc_usb_clk);
+                mxc_usb_clk = NULL;
+        }
+}
+
+void fsl_udc_clk_release(void)
+{
+        if (mxc_usb_clk) {
+                clk_disable(mxc_usb_clk);
+                clk_put(mxc_usb_clk);
+        }
+        clk_disable(mxc_ahb_clk);
+        clk_put(mxc_ahb_clk);
+}
diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_udc_core.c
index 9d7b95d4e3d2..42a74b8a0bb8 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.c
+++ b/drivers/usb/gadget/fsl_udc_core.c
@@ -38,6 +38,7 @@
 #include <linux/platform_device.h>
 #include <linux/fsl_devices.h>
 #include <linux/dmapool.h>
+#include <linux/delay.h>
 
 #include <asm/byteorder.h>
 #include <asm/io.h>
@@ -57,7 +58,9 @@ static const char driver_name[] = "fsl-usb2-udc";
 static const char driver_desc[] = DRIVER_DESC;
 
 static struct usb_dr_device *dr_regs;
+#ifndef CONFIG_ARCH_MXC
 static struct usb_sys_interface *usb_sys_regs;
+#endif
 
 /* it is initialized in probe()  */
 static struct fsl_udc *udc_controller = NULL;
@@ -174,10 +177,34 @@ static void nuke(struct fsl_ep *ep, int status)
 
 static int dr_controller_setup(struct fsl_udc *udc)
 {
-        unsigned int tmp = 0, portctrl = 0, ctrl = 0;
+        unsigned int tmp, portctrl;
+#ifndef CONFIG_ARCH_MXC
+        unsigned int ctrl;
+#endif
         unsigned long timeout;
 #define FSL_UDC_RESET_TIMEOUT 1000
 
+        /* Config PHY interface */
+        portctrl = fsl_readl(&dr_regs->portsc1);
+        portctrl &= ~(PORTSCX_PHY_TYPE_SEL | PORTSCX_PORT_WIDTH);
+        switch (udc->phy_mode) {
+        case FSL_USB2_PHY_ULPI:
+                portctrl |= PORTSCX_PTS_ULPI;
+                break;
+        case FSL_USB2_PHY_UTMI_WIDE:
+                portctrl |= PORTSCX_PTW_16BIT;
+                /* fall through */
+        case FSL_USB2_PHY_UTMI:
+                portctrl |= PORTSCX_PTS_UTMI;
+                break;
+        case FSL_USB2_PHY_SERIAL:
+                portctrl |= PORTSCX_PTS_FSLS;
+                break;
+        default:
+                return -EINVAL;
+        }
+        fsl_writel(portctrl, &dr_regs->portsc1);
+
         /* Stop and reset the usb controller */
         tmp = fsl_readl(&dr_regs->usbcmd);
         tmp &= ~USB_CMD_RUN_STOP;
@@ -215,31 +242,12 @@ static int dr_controller_setup(struct fsl_udc *udc)
                 udc->ep_qh, (int)tmp,
                 fsl_readl(&dr_regs->endpointlistaddr));
 
-        /* Config PHY interface */
-        portctrl = fsl_readl(&dr_regs->portsc1);
-        portctrl &= ~(PORTSCX_PHY_TYPE_SEL | PORTSCX_PORT_WIDTH);
-        switch (udc->phy_mode) {
-        case FSL_USB2_PHY_ULPI:
-                portctrl |= PORTSCX_PTS_ULPI;
-                break;
-        case FSL_USB2_PHY_UTMI_WIDE:
-                portctrl |= PORTSCX_PTW_16BIT;
-                /* fall through */
-        case FSL_USB2_PHY_UTMI:
-                portctrl |= PORTSCX_PTS_UTMI;
-                break;
-        case FSL_USB2_PHY_SERIAL:
-                portctrl |= PORTSCX_PTS_FSLS;
-                break;
-        default:
-                return -EINVAL;
-        }
-        fsl_writel(portctrl, &dr_regs->portsc1);
-
         /* Config control enable i/o output, cpu endian register */
+#ifndef CONFIG_ARCH_MXC
         ctrl = __raw_readl(&usb_sys_regs->control);
         ctrl |= USB_CTRL_IOENB;
         __raw_writel(ctrl, &usb_sys_regs->control);
+#endif
 
 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
         /* Turn on cache snooping hardware, since some PowerPC platforms
@@ -2043,6 +2051,7 @@ static int fsl_proc_read(char *page, char **start, off_t off, int count,
         size -= t;
         next += t;
 
+#ifndef CONFIG_ARCH_MXC
         tmp_reg = usb_sys_regs->snoop1;
         t = scnprintf(next, size, "Snoop1 Reg : = [0x%x]\n\n", tmp_reg);
         size -= t;
@@ -2053,6 +2062,7 @@ static int fsl_proc_read(char *page, char **start, off_t off, int count,
                         tmp_reg);
         size -= t;
         next += t;
+#endif
 
         /* ------fsl_udc, fsl_ep, fsl_request structure information ----- */
         ep = &udc->eps[0];
@@ -2263,14 +2273,21 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
                 goto err_kfree;
         }
 
-        dr_regs = ioremap(res->start, res->end - res->start + 1);
+        dr_regs = ioremap(res->start, resource_size(res));
         if (!dr_regs) {
                 ret = -ENOMEM;
                 goto err_release_mem_region;
         }
 
+#ifndef CONFIG_ARCH_MXC
         usb_sys_regs = (struct usb_sys_interface *)
                         ((u32)dr_regs + USB_DR_SYS_OFFSET);
+#endif
+
+        /* Initialize USB clocks */
+        ret = fsl_udc_clk_init(pdev);
+        if (ret < 0)
+                goto err_iounmap_noclk;
 
         /* Read Device Controller Capability Parameters register */
         dccparams = fsl_readl(&dr_regs->dccparams);
@@ -2308,6 +2325,8 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
          * leave usbintr reg untouched */
         dr_controller_setup(udc_controller);
 
+        fsl_udc_clk_finalize(pdev);
+
         /* Setup gadget structure */
         udc_controller->gadget.ops = &fsl_gadget_ops;
         udc_controller->gadget.is_dualspeed = 1;
@@ -2362,6 +2381,8 @@ err_unregister:
 err_free_irq:
         free_irq(udc_controller->irq, udc_controller);
 err_iounmap:
+        fsl_udc_clk_release();
+err_iounmap_noclk:
         iounmap(dr_regs);
 err_release_mem_region:
         release_mem_region(res->start, res->end - res->start + 1);
@@ -2384,6 +2405,8 @@ static int __exit fsl_udc_remove(struct platform_device *pdev)
                 return -ENODEV;
         udc_controller->done = &done;
 
+        fsl_udc_clk_release();
+
         /* DR has been stopped in usb_gadget_unregister_driver() */
         remove_proc_file();
 
diff --git a/drivers/usb/gadget/fsl_usb2_udc.h b/drivers/usb/gadget/fsl_usb2_udc.h
index e63ef12645f5..20aeceed48c7 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.h
+++ b/drivers/usb/gadget/fsl_usb2_udc.h
@@ -563,4 +563,22 @@ static void dump_msg(const char *label, const u8 * buf, unsigned int length)
                                         * 2 + ((windex & USB_DIR_IN) ? 1 : 0))
 #define get_pipe_by_ep(EP)      (ep_index(EP) * 2 + ep_is_in(EP))
 
+struct platform_device;
+#ifdef CONFIG_ARCH_MXC
+int fsl_udc_clk_init(struct platform_device *pdev);
+void fsl_udc_clk_finalize(struct platform_device *pdev);
+void fsl_udc_clk_release(void);
+#else
+static inline int fsl_udc_clk_init(struct platform_device *pdev)
+{
+        return 0;
+}
+static inline void fsl_udc_clk_finalize(struct platform_device *pdev)
+{
+}
+static inline void fsl_udc_clk_release(void)
+{
+}
+#endif
+
 #endif
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index ec6d439a2aa5..8e0e9a0b7364 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -137,6 +137,12 @@
 #define gadget_is_musbhdrc(g)   0
 #endif
 
+#ifdef CONFIG_USB_GADGET_LANGWELL
+#define gadget_is_langwell(g)   (!strcmp("langwell_udc", (g)->name))
+#else
+#define gadget_is_langwell(g)   0
+#endif
+
 /* from Montavista kernel (?) */
 #ifdef CONFIG_USB_GADGET_MPC8272
 #define gadget_is_mpc8272(g)    !strcmp("mpc8272_udc", (g)->name)
@@ -231,6 +237,8 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
                 return 0x22;
         else if (gadget_is_ci13xxx(gadget))
                 return 0x23;
+        else if (gadget_is_langwell(gadget))
+                return 0x24;
         return -ENOENT;
 }
 
diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index de010c939dbb..112bb40a427c 100644
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -110,10 +110,10 @@ goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
                 return -EINVAL;
         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
                 return -ESHUTDOWN;
-        if (ep->num != (desc->bEndpointAddress & 0x0f))
+        if (ep->num != usb_endpoint_num(desc))
                 return -EINVAL;
 
-        switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+        switch (usb_endpoint_type(desc)) {
         case USB_ENDPOINT_XFER_BULK:
         case USB_ENDPOINT_XFER_INT:
                 break;
@@ -142,7 +142,7 @@ goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
         /* ep1/ep2 dma direction is chosen early; it works in the other
          * direction, with pio.  be cautious with out-dma.
          */
-        ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
+        ep->is_in = usb_endpoint_dir_in(desc);
         if (ep->is_in) {
                 mode |= 1;
                 ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
diff --git a/drivers/usb/gadget/imx_udc.c b/drivers/usb/gadget/imx_udc.c
index 168658b4b4e2..c52a681f376c 100644
--- a/drivers/usb/gadget/imx_udc.c
+++ b/drivers/usb/gadget/imx_udc.c
@@ -415,6 +415,13 @@ static int write_packet(struct imx_ep_struct *imx_ep, struct imx_request *req)
         u8      *buf;
         int     length, count, temp;
 
+        if (unlikely(__raw_readl(imx_ep->imx_usb->base +
+                                 USB_EP_STAT(EP_NO(imx_ep))) & EPSTAT_ZLPS)) {
+                D_TRX(imx_ep->imx_usb->dev, "<%s> zlp still queued in EP %s\n",
+                        __func__, imx_ep->ep.name);
+                return -1;
+        }
+
         buf = req->req.buf + req->req.actual;
         prefetch(buf);
 
@@ -734,9 +741,12 @@ static struct usb_request *imx_ep_alloc_request
 {
         struct imx_request *req;
 
+        if (!usb_ep)
+                return NULL;
+
         req = kzalloc(sizeof *req, gfp_flags);
-        if (!req || !usb_ep)
-                return 0;
+        if (!req)
+                return NULL;
 
         INIT_LIST_HEAD(&req->queue);
         req->in_use = 0;
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index d20937f28a19..7d33f50b5874 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -384,9 +384,8 @@ ep_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
                 return value;
 
         /* halt any endpoint by doing a "wrong direction" i/o call */
-        if (data->desc.bEndpointAddress & USB_DIR_IN) {
-                if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
-                                == USB_ENDPOINT_XFER_ISOC)
+        if (usb_endpoint_dir_in(&data->desc)) {
+                if (usb_endpoint_xfer_isoc(&data->desc))
                         return -EINVAL;
                 DBG (data->dev, "%s halt\n", data->name);
                 spin_lock_irq (&data->dev->lock);
@@ -428,9 +427,8 @@ ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
                 return value;
 
         /* halt any endpoint by doing a "wrong direction" i/o call */
-        if (!(data->desc.bEndpointAddress & USB_DIR_IN)) {
-                if ((data->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
-                                == USB_ENDPOINT_XFER_ISOC)
+        if (!usb_endpoint_dir_in(&data->desc)) {
+                if (usb_endpoint_xfer_isoc(&data->desc))
                         return -EINVAL;
                 DBG (data->dev, "%s halt\n", data->name);
                 spin_lock_irq (&data->dev->lock);
@@ -691,7 +689,7 @@ ep_aio_read(struct kiocb *iocb, const struct iovec *iov,
         struct ep_data          *epdata = iocb->ki_filp->private_data;
         char                    *buf;
 
-        if (unlikely(epdata->desc.bEndpointAddress & USB_DIR_IN))
+        if (unlikely(usb_endpoint_dir_in(&epdata->desc)))
                 return -EINVAL;
 
         buf = kmalloc(iocb->ki_left, GFP_KERNEL);
@@ -711,7 +709,7 @@ ep_aio_write(struct kiocb *iocb, const struct iovec *iov,
         size_t                  len = 0;
         int                     i = 0;
 
-        if (unlikely(!(epdata->desc.bEndpointAddress & USB_DIR_IN)))
+        if (unlikely(!usb_endpoint_dir_in(&epdata->desc)))
                 return -EINVAL;
 
         buf = kmalloc(iocb->ki_left, GFP_KERNEL);
diff --git a/drivers/usb/gadget/langwell_udc.c b/drivers/usb/gadget/langwell_udc.c
new file mode 100644
index 000000000000..6829d5961359
--- /dev/null
+++ b/drivers/usb/gadget/langwell_udc.c
@@ -0,0 +1,3373 @@
+/*
+ * Intel Langwell USB Device Controller driver
+ * Copyright (C) 2008-2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+
+/* #undef       DEBUG */
+/* #undef       VERBOSE */
+
+#if defined(CONFIG_USB_LANGWELL_OTG)
+#define OTG_TRANSCEIVER
+#endif
+
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
+#include <linux/pm.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+#include "langwell_udc.h"
+
+
+#define DRIVER_DESC             "Intel Langwell USB Device Controller driver"
+#define DRIVER_VERSION          "16 May 2009"
+
+static const char driver_name[] = "langwell_udc";
+static const char driver_desc[] = DRIVER_DESC;
+
+
+/* controller device global variable */
+static struct langwell_udc      *the_controller;
+
+/* for endpoint 0 operations */
+static const struct usb_endpoint_descriptor
+langwell_ep0_desc = {
+        .bLength =              USB_DT_ENDPOINT_SIZE,
+        .bDescriptorType =      USB_DT_ENDPOINT,
+        .bEndpointAddress =     0,
+        .bmAttributes =         USB_ENDPOINT_XFER_CONTROL,
+        .wMaxPacketSize =       EP0_MAX_PKT_SIZE,
+};
+
+
+/*-------------------------------------------------------------------------*/
+/* debugging */
+
+#ifdef  DEBUG
+#define DBG(dev, fmt, args...) \
+        pr_debug("%s %s: " fmt , driver_name, \
+                        pci_name(dev->pdev), ## args)
+#else
+#define DBG(dev, fmt, args...) \
+        do { } while (0)
+#endif /* DEBUG */
+
+
+#ifdef  VERBOSE
+#define VDBG DBG
+#else
+#define VDBG(dev, fmt, args...) \
+        do { } while (0)
+#endif  /* VERBOSE */
+
+
+#define ERROR(dev, fmt, args...) \
+        pr_err("%s %s: " fmt , driver_name, \
+                        pci_name(dev->pdev), ## args)
+
+#define WARNING(dev, fmt, args...) \
+        pr_warning("%s %s: " fmt , driver_name, \
+                        pci_name(dev->pdev), ## args)
+
+#define INFO(dev, fmt, args...) \
+        pr_info("%s %s: " fmt , driver_name, \
+                        pci_name(dev->pdev), ## args)
+
+
+#ifdef  VERBOSE
+static inline void print_all_registers(struct langwell_udc *dev)
+{
+        int     i;
+
+        /* Capability Registers */
+        printk(KERN_DEBUG "Capability Registers (offset: "
+                        "0x%04x, length: 0x%08x)\n",
+                        CAP_REG_OFFSET,
+                        (u32)sizeof(struct langwell_cap_regs));
+        printk(KERN_DEBUG "caplength=0x%02x\n",
+                        readb(&dev->cap_regs->caplength));
+        printk(KERN_DEBUG "hciversion=0x%04x\n",
+                        readw(&dev->cap_regs->hciversion));
+        printk(KERN_DEBUG "hcsparams=0x%08x\n",
+                        readl(&dev->cap_regs->hcsparams));
+        printk(KERN_DEBUG "hccparams=0x%08x\n",
+                        readl(&dev->cap_regs->hccparams));
+        printk(KERN_DEBUG "dciversion=0x%04x\n",
+                        readw(&dev->cap_regs->dciversion));
+        printk(KERN_DEBUG "dccparams=0x%08x\n",
+                        readl(&dev->cap_regs->dccparams));
+
+        /* Operational Registers */
+        printk(KERN_DEBUG "Operational Registers (offset: "
+                        "0x%04x, length: 0x%08x)\n",
+                        OP_REG_OFFSET,
+                        (u32)sizeof(struct langwell_op_regs));
+        printk(KERN_DEBUG "extsts=0x%08x\n",
+                        readl(&dev->op_regs->extsts));
+        printk(KERN_DEBUG "extintr=0x%08x\n",
+                        readl(&dev->op_regs->extintr));
+        printk(KERN_DEBUG "usbcmd=0x%08x\n",
+                        readl(&dev->op_regs->usbcmd));
+        printk(KERN_DEBUG "usbsts=0x%08x\n",
+                        readl(&dev->op_regs->usbsts));
+        printk(KERN_DEBUG "usbintr=0x%08x\n",
+                        readl(&dev->op_regs->usbintr));
+        printk(KERN_DEBUG "frindex=0x%08x\n",
+                        readl(&dev->op_regs->frindex));
+        printk(KERN_DEBUG "ctrldssegment=0x%08x\n",
+                        readl(&dev->op_regs->ctrldssegment));
+        printk(KERN_DEBUG "deviceaddr=0x%08x\n",
+                        readl(&dev->op_regs->deviceaddr));
+        printk(KERN_DEBUG "endpointlistaddr=0x%08x\n",
+                        readl(&dev->op_regs->endpointlistaddr));
+        printk(KERN_DEBUG "ttctrl=0x%08x\n",
+                        readl(&dev->op_regs->ttctrl));
+        printk(KERN_DEBUG "burstsize=0x%08x\n",
+                        readl(&dev->op_regs->burstsize));
+        printk(KERN_DEBUG "txfilltuning=0x%08x\n",
+                        readl(&dev->op_regs->txfilltuning));
+        printk(KERN_DEBUG "txttfilltuning=0x%08x\n",
+                        readl(&dev->op_regs->txttfilltuning));
+        printk(KERN_DEBUG "ic_usb=0x%08x\n",
+                        readl(&dev->op_regs->ic_usb));
+        printk(KERN_DEBUG "ulpi_viewport=0x%08x\n",
+                        readl(&dev->op_regs->ulpi_viewport));
+        printk(KERN_DEBUG "configflag=0x%08x\n",
+                        readl(&dev->op_regs->configflag));
+        printk(KERN_DEBUG "portsc1=0x%08x\n",
+                        readl(&dev->op_regs->portsc1));
+        printk(KERN_DEBUG "devlc=0x%08x\n",
+                        readl(&dev->op_regs->devlc));
+        printk(KERN_DEBUG "otgsc=0x%08x\n",
+                        readl(&dev->op_regs->otgsc));
+        printk(KERN_DEBUG "usbmode=0x%08x\n",
+                        readl(&dev->op_regs->usbmode));
+        printk(KERN_DEBUG "endptnak=0x%08x\n",
+                        readl(&dev->op_regs->endptnak));
+        printk(KERN_DEBUG "endptnaken=0x%08x\n",
+                        readl(&dev->op_regs->endptnaken));
+        printk(KERN_DEBUG "endptsetupstat=0x%08x\n",
+                        readl(&dev->op_regs->endptsetupstat));
+        printk(KERN_DEBUG "endptprime=0x%08x\n",
+                        readl(&dev->op_regs->endptprime));
+        printk(KERN_DEBUG "endptflush=0x%08x\n",
+                        readl(&dev->op_regs->endptflush));
+        printk(KERN_DEBUG "endptstat=0x%08x\n",
+                        readl(&dev->op_regs->endptstat));
+        printk(KERN_DEBUG "endptcomplete=0x%08x\n",
+                        readl(&dev->op_regs->endptcomplete));
+
+        for (i = 0; i < dev->ep_max / 2; i++) {
+                printk(KERN_DEBUG "endptctrl[%d]=0x%08x\n",
+                                i, readl(&dev->op_regs->endptctrl[i]));
+        }
+}
+#endif /* VERBOSE */
+
+
+/*-------------------------------------------------------------------------*/
+
+#define DIR_STRING(bAddress)    (((bAddress) & USB_DIR_IN) ? "in" : "out")
+
+#define is_in(ep)       (((ep)->ep_num == 0) ? ((ep)->dev->ep0_dir == \
+                        USB_DIR_IN) : ((ep)->desc->bEndpointAddress \
+                        & USB_DIR_IN) == USB_DIR_IN)
+
+
+#ifdef  DEBUG
+static char *type_string(u8 bmAttributes)
+{
+        switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
+        case USB_ENDPOINT_XFER_BULK:
+                return "bulk";
+        case USB_ENDPOINT_XFER_ISOC:
+                return "iso";
+        case USB_ENDPOINT_XFER_INT:
+                return "int";
+        };
+
+        return "control";
+}
+#endif
+
+
+/* configure endpoint control registers */
+static void ep_reset(struct langwell_ep *ep, unsigned char ep_num,
+                unsigned char is_in, unsigned char ep_type)
+{
+        struct langwell_udc     *dev;
+        u32                     endptctrl;
+
+        dev = ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+        if (is_in) {    /* TX */
+                if (ep_num)
+                        endptctrl |= EPCTRL_TXR;
+                endptctrl |= EPCTRL_TXE;
+                endptctrl |= ep_type << EPCTRL_TXT_SHIFT;
+        } else {        /* RX */
+                if (ep_num)
+                        endptctrl |= EPCTRL_RXR;
+                endptctrl |= EPCTRL_RXE;
+                endptctrl |= ep_type << EPCTRL_RXT_SHIFT;
+        }
+
+        writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* reset ep0 dQH and endptctrl */
+static void ep0_reset(struct langwell_udc *dev)
+{
+        struct langwell_ep      *ep;
+        int                     i;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* ep0 in and out */
+        for (i = 0; i < 2; i++) {
+                ep = &dev->ep[i];
+                ep->dev = dev;
+
+                /* ep0 dQH */
+                ep->dqh = &dev->ep_dqh[i];
+
+                /* configure ep0 endpoint capabilities in dQH */
+                ep->dqh->dqh_ios = 1;
+                ep->dqh->dqh_mpl = EP0_MAX_PKT_SIZE;
+
+                /* FIXME: enable ep0-in HW zero length termination select */
+                if (is_in(ep))
+                        ep->dqh->dqh_zlt = 0;
+                ep->dqh->dqh_mult = 0;
+
+                /* configure ep0 control registers */
+                ep_reset(&dev->ep[0], 0, i, USB_ENDPOINT_XFER_CONTROL);
+        }
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoints operations */
+
+/* configure endpoint, making it usable */
+static int langwell_ep_enable(struct usb_ep *_ep,
+                const struct usb_endpoint_descriptor *desc)
+{
+        struct langwell_udc     *dev;
+        struct langwell_ep      *ep;
+        u16                     max = 0;
+        unsigned long           flags;
+        int                     retval = 0;
+        unsigned char           zlt, ios = 0, mult = 0;
+
+        ep = container_of(_ep, struct langwell_ep, ep);
+        dev = ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (!_ep || !desc || ep->desc
+                        || desc->bDescriptorType != USB_DT_ENDPOINT)
+                return -EINVAL;
+
+        if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
+                return -ESHUTDOWN;
+
+        max = le16_to_cpu(desc->wMaxPacketSize);
+
+        /*
+         * disable HW zero length termination select
+         * driver handles zero length packet through req->req.zero
+         */
+        zlt = 1;
+
+        /*
+         * sanity check type, direction, address, and then
+         * initialize the endpoint capabilities fields in dQH
+         */
+        switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+        case USB_ENDPOINT_XFER_CONTROL:
+                ios = 1;
+                break;
+        case USB_ENDPOINT_XFER_BULK:
+                if ((dev->gadget.speed == USB_SPEED_HIGH
+                                        && max != 512)
+                                || (dev->gadget.speed == USB_SPEED_FULL
+                                        && max > 64)) {
+                        goto done;
+                }
+                break;
+        case USB_ENDPOINT_XFER_INT:
+                if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
+                        goto done;
+
+                switch (dev->gadget.speed) {
+                case USB_SPEED_HIGH:
+                        if (max <= 1024)
+                                break;
+                case USB_SPEED_FULL:
+                        if (max <= 64)
+                                break;
+                default:
+                        if (max <= 8)
+                                break;
+                        goto done;
+                }
+                break;
+        case USB_ENDPOINT_XFER_ISOC:
+                if (strstr(ep->ep.name, "-bulk")
+                                || strstr(ep->ep.name, "-int"))
+                        goto done;
+
+                switch (dev->gadget.speed) {
+                case USB_SPEED_HIGH:
+                        if (max <= 1024)
+                                break;
+                case USB_SPEED_FULL:
+                        if (max <= 1023)
+                                break;
+                default:
+                        goto done;
+                }
+                /*
+                 * FIXME:
+                 * calculate transactions needed for high bandwidth iso
+                 */
+                mult = (unsigned char)(1 + ((max >> 11) & 0x03));
+                max = max & 0x8ff;      /* bit 0~10 */
+                /* 3 transactions at most */
+                if (mult > 3)
+                        goto done;
+                break;
+        default:
+                goto done;
+        }
+
+        spin_lock_irqsave(&dev->lock, flags);
+
+        /* configure endpoint capabilities in dQH */
+        ep->dqh->dqh_ios = ios;
+        ep->dqh->dqh_mpl = cpu_to_le16(max);
+        ep->dqh->dqh_zlt = zlt;
+        ep->dqh->dqh_mult = mult;
+
+        ep->ep.maxpacket = max;
+        ep->desc = desc;
+        ep->stopped = 0;
+        ep->ep_num = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+
+        /* ep_type */
+        ep->ep_type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+
+        /* configure endpoint control registers */
+        ep_reset(ep, ep->ep_num, is_in(ep), ep->ep_type);
+
+        DBG(dev, "enabled %s (ep%d%s-%s), max %04x\n",
+                        _ep->name,
+                        ep->ep_num,
+                        DIR_STRING(desc->bEndpointAddress),
+                        type_string(desc->bmAttributes),
+                        max);
+
+        spin_unlock_irqrestore(&dev->lock, flags);
+done:
+        VDBG(dev, "<--- %s()\n", __func__);
+        return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* retire a request */
+static void done(struct langwell_ep *ep, struct langwell_request *req,
+                int status)
+{
+        struct langwell_udc     *dev = ep->dev;
+        unsigned                stopped = ep->stopped;
+        struct langwell_dtd     *curr_dtd, *next_dtd;
+        int                     i;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* remove the req from ep->queue */
+        list_del_init(&req->queue);
+
+        if (req->req.status == -EINPROGRESS)
+                req->req.status = status;
+        else
+                status = req->req.status;
+
+        /* free dTD for the request */
+        next_dtd = req->head;
+        for (i = 0; i < req->dtd_count; i++) {
+                curr_dtd = next_dtd;
+                if (i != req->dtd_count - 1)
+                        next_dtd = curr_dtd->next_dtd_virt;
+                dma_pool_free(dev->dtd_pool, curr_dtd, curr_dtd->dtd_dma);
+        }
+
+        if (req->mapped) {
+                dma_unmap_single(&dev->pdev->dev, req->req.dma, req->req.length,
+                        is_in(ep) ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+                req->req.dma = DMA_ADDR_INVALID;
+                req->mapped = 0;
+        } else
+                dma_sync_single_for_cpu(&dev->pdev->dev, req->req.dma,
+                                req->req.length,
+                                is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+
+        if (status != -ESHUTDOWN)
+                DBG(dev, "complete %s, req %p, stat %d, len %u/%u\n",
+                        ep->ep.name, &req->req, status,
+                        req->req.actual, req->req.length);
+
+        /* don't modify queue heads during completion callback */
+        ep->stopped = 1;
+
+        spin_unlock(&dev->lock);
+        /* complete routine from gadget driver */
+        if (req->req.complete)
+                req->req.complete(&ep->ep, &req->req);
+
+        spin_lock(&dev->lock);
+        ep->stopped = stopped;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+static void langwell_ep_fifo_flush(struct usb_ep *_ep);
+
+/* delete all endpoint requests, called with spinlock held */
+static void nuke(struct langwell_ep *ep, int status)
+{
+        /* called with spinlock held */
+        ep->stopped = 1;
+
+        /* endpoint fifo flush */
+        if (&ep->ep && ep->desc)
+                langwell_ep_fifo_flush(&ep->ep);
+
+        while (!list_empty(&ep->queue)) {
+                struct langwell_request *req = NULL;
+                req = list_entry(ep->queue.next, struct langwell_request,
+                                queue);
+                done(ep, req, status);
+        }
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoint is no longer usable */
+static int langwell_ep_disable(struct usb_ep *_ep)
+{
+        struct langwell_ep      *ep;
+        unsigned long           flags;
+        struct langwell_udc     *dev;
+        int                     ep_num;
+        u32                     endptctrl;
+
+        ep = container_of(_ep, struct langwell_ep, ep);
+        dev = ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (!_ep || !ep->desc)
+                return -EINVAL;
+
+        spin_lock_irqsave(&dev->lock, flags);
+
+        /* disable endpoint control register */
+        ep_num = ep->ep_num;
+        endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+        if (is_in(ep))
+                endptctrl &= ~EPCTRL_TXE;
+        else
+                endptctrl &= ~EPCTRL_RXE;
+        writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+        /* nuke all pending requests (does flush) */
+        nuke(ep, -ESHUTDOWN);
+
+        ep->desc = NULL;
+        ep->stopped = 1;
+
+        spin_unlock_irqrestore(&dev->lock, flags);
+
+        DBG(dev, "disabled %s\n", _ep->name);
+        VDBG(dev, "<--- %s()\n", __func__);
+
+        return 0;
+}
+
+
+/* allocate a request object to use with this endpoint */
+static struct usb_request *langwell_alloc_request(struct usb_ep *_ep,
+                gfp_t gfp_flags)
+{
+        struct langwell_ep      *ep;
+        struct langwell_udc     *dev;
+        struct langwell_request *req = NULL;
+
+        if (!_ep)
+                return NULL;
+
+        ep = container_of(_ep, struct langwell_ep, ep);
+        dev = ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        req = kzalloc(sizeof(*req), gfp_flags);
+        if (!req)
+                return NULL;
+
+        req->req.dma = DMA_ADDR_INVALID;
+        INIT_LIST_HEAD(&req->queue);
+
+        VDBG(dev, "alloc request for %s\n", _ep->name);
+        VDBG(dev, "<--- %s()\n", __func__);
+        return &req->req;
+}
+
+
+/* free a request object */
+static void langwell_free_request(struct usb_ep *_ep,
+                struct usb_request *_req)
+{
+        struct langwell_ep      *ep;
+        struct langwell_udc     *dev;
+        struct langwell_request *req = NULL;
+
+        ep = container_of(_ep, struct langwell_ep, ep);
+        dev = ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (!_ep || !_req)
+                return;
+
+        req = container_of(_req, struct langwell_request, req);
+        WARN_ON(!list_empty(&req->queue));
+
+        if (_req)
+                kfree(req);
+
+        VDBG(dev, "free request for %s\n", _ep->name);
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* queue dTD and PRIME endpoint */
+static int queue_dtd(struct langwell_ep *ep, struct langwell_request *req)
+{
+        u32                     bit_mask, usbcmd, endptstat, dtd_dma;
+        u8                      dtd_status;
+        int                     i;
+        struct langwell_dqh     *dqh;
+        struct langwell_udc     *dev;
+
+        dev = ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        i = ep->ep_num * 2 + is_in(ep);
+        dqh = &dev->ep_dqh[i];
+
+        if (ep->ep_num)
+                VDBG(dev, "%s\n", ep->name);
+        else
+                /* ep0 */
+                VDBG(dev, "%s-%s\n", ep->name, is_in(ep) ? "in" : "out");
+
+        VDBG(dev, "ep_dqh[%d] addr: 0x%08x\n", i, (u32)&(dev->ep_dqh[i]));
+
+        bit_mask = is_in(ep) ?
+                (1 << (ep->ep_num + 16)) : (1 << (ep->ep_num));
+
+        VDBG(dev, "bit_mask = 0x%08x\n", bit_mask);
+
+        /* check if the pipe is empty */
+        if (!(list_empty(&ep->queue))) {
+                /* add dTD to the end of linked list */
+                struct langwell_request *lastreq;
+                lastreq = list_entry(ep->queue.prev,
+                                struct langwell_request, queue);
+
+                lastreq->tail->dtd_next =
+                        cpu_to_le32(req->head->dtd_dma & DTD_NEXT_MASK);
+
+                /* read prime bit, if 1 goto out */
+                if (readl(&dev->op_regs->endptprime) & bit_mask)
+                        goto out;
+
+                do {
+                        /* set ATDTW bit in USBCMD */
+                        usbcmd = readl(&dev->op_regs->usbcmd);
+                        writel(usbcmd | CMD_ATDTW, &dev->op_regs->usbcmd);
+
+                        /* read correct status bit */
+                        endptstat = readl(&dev->op_regs->endptstat) & bit_mask;
+
+                } while (!(readl(&dev->op_regs->usbcmd) & CMD_ATDTW));
+
+                /* write ATDTW bit to 0 */
+                usbcmd = readl(&dev->op_regs->usbcmd);
+                writel(usbcmd & ~CMD_ATDTW, &dev->op_regs->usbcmd);
+
+                if (endptstat)
+                        goto out;
+        }
+
+        /* write dQH next pointer and terminate bit to 0 */
+        dtd_dma = req->head->dtd_dma & DTD_NEXT_MASK;
+        dqh->dtd_next = cpu_to_le32(dtd_dma);
+
+        /* clear active and halt bit */
+        dtd_status = (u8) ~(DTD_STS_ACTIVE | DTD_STS_HALTED);
+        dqh->dtd_status &= dtd_status;
+        VDBG(dev, "dqh->dtd_status = 0x%x\n", dqh->dtd_status);
+
+        /* write 1 to endptprime register to PRIME endpoint */
+        bit_mask = is_in(ep) ? (1 << (ep->ep_num + 16)) : (1 << ep->ep_num);
+        VDBG(dev, "endprime bit_mask = 0x%08x\n", bit_mask);
+        writel(bit_mask, &dev->op_regs->endptprime);
+out:
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* fill in the dTD structure to build a transfer descriptor */
+static struct langwell_dtd *build_dtd(struct langwell_request *req,
+                unsigned *length, dma_addr_t *dma, int *is_last)
+{
+        u32                      buf_ptr;
+        struct langwell_dtd     *dtd;
+        struct langwell_udc     *dev;
+        int                     i;
+
+        dev = req->ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* the maximum transfer length, up to 16k bytes */
+        *length = min(req->req.length - req->req.actual,
+                        (unsigned)DTD_MAX_TRANSFER_LENGTH);
+
+        /* create dTD dma_pool resource */
+        dtd = dma_pool_alloc(dev->dtd_pool, GFP_KERNEL, dma);
+        if (dtd == NULL)
+                return dtd;
+        dtd->dtd_dma = *dma;
+
+        /* initialize buffer page pointers */
+        buf_ptr = (u32)(req->req.dma + req->req.actual);
+        for (i = 0; i < 5; i++)
+                dtd->dtd_buf[i] = cpu_to_le32(buf_ptr + i * PAGE_SIZE);
+
+        req->req.actual += *length;
+
+        /* fill in total bytes with transfer size */
+        dtd->dtd_total = cpu_to_le16(*length);
+        VDBG(dev, "dtd->dtd_total = %d\n", dtd->dtd_total);
+
+        /* set is_last flag if req->req.zero is set or not */
+        if (req->req.zero) {
+                if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0)
+                        *is_last = 1;
+                else
+                        *is_last = 0;
+        } else if (req->req.length == req->req.actual) {
+                *is_last = 1;
+        } else
+                *is_last = 0;
+
+        if (*is_last == 0)
+                VDBG(dev, "multi-dtd request!\n");
+
+        /* set interrupt on complete bit for the last dTD */
+        if (*is_last && !req->req.no_interrupt)
+                dtd->dtd_ioc = 1;
+
+        /* set multiplier override 0 for non-ISO and non-TX endpoint */
+        dtd->dtd_multo = 0;
+
+        /* set the active bit of status field to 1 */
+        dtd->dtd_status = DTD_STS_ACTIVE;
+        VDBG(dev, "dtd->dtd_status = 0x%02x\n", dtd->dtd_status);
+
+        VDBG(dev, "length = %d, dma addr= 0x%08x\n", *length, (int)*dma);
+        VDBG(dev, "<--- %s()\n", __func__);
+        return dtd;
+}
+
+
+/* generate dTD linked list for a request */
+static int req_to_dtd(struct langwell_request *req)
+{
+        unsigned                count;
+        int                     is_last, is_first = 1;
+        struct langwell_dtd     *dtd, *last_dtd = NULL;
+        struct langwell_udc     *dev;
+        dma_addr_t              dma;
+
+        dev = req->ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+        do {
+                dtd = build_dtd(req, &count, &dma, &is_last);
+                if (dtd == NULL)
+                        return -ENOMEM;
+
+                if (is_first) {
+                        is_first = 0;
+                        req->head = dtd;
+                } else {
+                        last_dtd->dtd_next = cpu_to_le32(dma);
+                        last_dtd->next_dtd_virt = dtd;
+                }
+                last_dtd = dtd;
+                req->dtd_count++;
+        } while (!is_last);
+
+        /* set terminate bit to 1 for the last dTD */
+        dtd->dtd_next = DTD_TERM;
+
+        req->tail = dtd;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* queue (submits) an I/O requests to an endpoint */
+static int langwell_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
+                gfp_t gfp_flags)
+{
+        struct langwell_request *req;
+        struct langwell_ep      *ep;
+        struct langwell_udc     *dev;
+        unsigned long           flags;
+        int                     is_iso = 0, zlflag = 0;
+
+        /* always require a cpu-view buffer */
+        req = container_of(_req, struct langwell_request, req);
+        ep = container_of(_ep, struct langwell_ep, ep);
+
+        if (!_req || !_req->complete || !_req->buf
+                        || !list_empty(&req->queue)) {
+                return -EINVAL;
+        }
+
+        if (unlikely(!_ep || !ep->desc))
+                return -EINVAL;
+
+        dev = ep->dev;
+        req->ep = ep;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (ep->desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
+                if (req->req.length > ep->ep.maxpacket)
+                        return -EMSGSIZE;
+                is_iso = 1;
+        }
+
+        if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
+                return -ESHUTDOWN;
+
+        /* set up dma mapping in case the caller didn't */
+        if (_req->dma == DMA_ADDR_INVALID) {
+                /* WORKAROUND: WARN_ON(size == 0) */
+                if (_req->length == 0) {
+                        VDBG(dev, "req->length: 0->1\n");
+                        zlflag = 1;
+                        _req->length++;
+                }
+
+                _req->dma = dma_map_single(&dev->pdev->dev,
+                                _req->buf, _req->length,
+                                is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+                if (zlflag && (_req->length == 1)) {
+                        VDBG(dev, "req->length: 1->0\n");
+                        zlflag = 0;
+                        _req->length = 0;
+                }
+
+                req->mapped = 1;
+                VDBG(dev, "req->mapped = 1\n");
+        } else {
+                dma_sync_single_for_device(&dev->pdev->dev,
+                                _req->dma, _req->length,
+                                is_in(ep) ?  DMA_TO_DEVICE : DMA_FROM_DEVICE);
+                req->mapped = 0;
+                VDBG(dev, "req->mapped = 0\n");
+        }
+
+        DBG(dev, "%s queue req %p, len %u, buf %p, dma 0x%08x\n",
+                        _ep->name,
+                        _req, _req->length, _req->buf, _req->dma);
+
+        _req->status = -EINPROGRESS;
+        _req->actual = 0;
+        req->dtd_count = 0;
+
+        spin_lock_irqsave(&dev->lock, flags);
+
+        /* build and put dTDs to endpoint queue */
+        if (!req_to_dtd(req)) {
+                queue_dtd(ep, req);
+        } else {
+                spin_unlock_irqrestore(&dev->lock, flags);
+                return -ENOMEM;
+        }
+
+        /* update ep0 state */
+        if (ep->ep_num == 0)
+                dev->ep0_state = DATA_STATE_XMIT;
+
+        if (likely(req != NULL)) {
+                list_add_tail(&req->queue, &ep->queue);
+                VDBG(dev, "list_add_tail() \n");
+        }
+
+        spin_unlock_irqrestore(&dev->lock, flags);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* dequeue (cancels, unlinks) an I/O request from an endpoint */
+static int langwell_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+        struct langwell_ep      *ep;
+        struct langwell_udc     *dev;
+        struct langwell_request *req;
+        unsigned long           flags;
+        int                     stopped, ep_num, retval = 0;
+        u32                     endptctrl;
+
+        ep = container_of(_ep, struct langwell_ep, ep);
+        dev = ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (!_ep || !ep->desc || !_req)
+                return -EINVAL;
+
+        if (!dev->driver)
+                return -ESHUTDOWN;
+
+        spin_lock_irqsave(&dev->lock, flags);
+        stopped = ep->stopped;
+
+        /* quiesce dma while we patch the queue */
+        ep->stopped = 1;
+        ep_num = ep->ep_num;
+
+        /* disable endpoint control register */
+        endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+        if (is_in(ep))
+                endptctrl &= ~EPCTRL_TXE;
+        else
+                endptctrl &= ~EPCTRL_RXE;
+        writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+        /* make sure it's still queued on this endpoint */
+        list_for_each_entry(req, &ep->queue, queue) {
+                if (&req->req == _req)
+                        break;
+        }
+
+        if (&req->req != _req) {
+                retval = -EINVAL;
+                goto done;
+        }
+
+        /* queue head may be partially complete. */
+        if (ep->queue.next == &req->queue) {
+                DBG(dev, "unlink (%s) dma\n", _ep->name);
+                _req->status = -ECONNRESET;
+                langwell_ep_fifo_flush(&ep->ep);
+
+                /* not the last request in endpoint queue */
+                if (likely(ep->queue.next == &req->queue)) {
+                        struct langwell_dqh     *dqh;
+                        struct langwell_request *next_req;
+
+                        dqh = ep->dqh;
+                        next_req = list_entry(req->queue.next,
+                                        struct langwell_request, queue);
+
+                        /* point the dQH to the first dTD of next request */
+                        writel((u32) next_req->head, &dqh->dqh_current);
+                }
+        } else {
+                struct langwell_request *prev_req;
+
+                prev_req = list_entry(req->queue.prev,
+                                struct langwell_request, queue);
+                writel(readl(&req->tail->dtd_next),
+                                &prev_req->tail->dtd_next);
+        }
+
+        done(ep, req, -ECONNRESET);
+
+done:
+        /* enable endpoint again */
+        endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+        if (is_in(ep))
+                endptctrl |= EPCTRL_TXE;
+        else
+                endptctrl |= EPCTRL_RXE;
+        writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+        ep->stopped = stopped;
+        spin_unlock_irqrestore(&dev->lock, flags);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoint set/clear halt */
+static void ep_set_halt(struct langwell_ep *ep, int value)
+{
+        u32                     endptctrl = 0;
+        int                     ep_num;
+        struct langwell_udc     *dev = ep->dev;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        ep_num = ep->ep_num;
+        endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+
+        /* value: 1 - set halt, 0 - clear halt */
+        if (value) {
+                /* set the stall bit */
+                if (is_in(ep))
+                        endptctrl |= EPCTRL_TXS;
+                else
+                        endptctrl |= EPCTRL_RXS;
+        } else {
+                /* clear the stall bit and reset data toggle */
+                if (is_in(ep)) {
+                        endptctrl &= ~EPCTRL_TXS;
+                        endptctrl |= EPCTRL_TXR;
+                } else {
+                        endptctrl &= ~EPCTRL_RXS;
+                        endptctrl |= EPCTRL_RXR;
+                }
+        }
+
+        writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* set the endpoint halt feature */
+static int langwell_ep_set_halt(struct usb_ep *_ep, int value)
+{
+        struct langwell_ep      *ep;
+        struct langwell_udc     *dev;
+        unsigned long           flags;
+        int                     retval = 0;
+
+        ep = container_of(_ep, struct langwell_ep, ep);
+        dev = ep->dev;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (!_ep || !ep->desc)
+                return -EINVAL;
+
+        if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
+                return -ESHUTDOWN;
+
+        if (ep->desc && (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+                        == USB_ENDPOINT_XFER_ISOC)
+                return  -EOPNOTSUPP;
+
+        spin_lock_irqsave(&dev->lock, flags);
+
+        /*
+         * attempt to halt IN ep will fail if any transfer requests
+         * are still queue
+         */
+        if (!list_empty(&ep->queue) && is_in(ep) && value) {
+                /* IN endpoint FIFO holds bytes */
+                DBG(dev, "%s FIFO holds bytes\n", _ep->name);
+                retval = -EAGAIN;
+                goto done;
+        }
+
+        /* endpoint set/clear halt */
+        if (ep->ep_num) {
+                ep_set_halt(ep, value);
+        } else { /* endpoint 0 */
+                dev->ep0_state = WAIT_FOR_SETUP;
+                dev->ep0_dir = USB_DIR_OUT;
+        }
+done:
+        spin_unlock_irqrestore(&dev->lock, flags);
+        DBG(dev, "%s %s halt\n", _ep->name, value ? "set" : "clear");
+        VDBG(dev, "<--- %s()\n", __func__);
+        return retval;
+}
+
+
+/* set the halt feature and ignores clear requests */
+static int langwell_ep_set_wedge(struct usb_ep *_ep)
+{
+        struct langwell_ep      *ep;
+        struct langwell_udc     *dev;
+
+        ep = container_of(_ep, struct langwell_ep, ep);
+        dev = ep->dev;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (!_ep || !ep->desc)
+                return -EINVAL;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return usb_ep_set_halt(_ep);
+}
+
+
+/* flush contents of a fifo */
+static void langwell_ep_fifo_flush(struct usb_ep *_ep)
+{
+        struct langwell_ep      *ep;
+        struct langwell_udc     *dev;
+        u32                     flush_bit;
+        unsigned long           timeout;
+
+        ep = container_of(_ep, struct langwell_ep, ep);
+        dev = ep->dev;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (!_ep || !ep->desc) {
+                VDBG(dev, "ep or ep->desc is NULL\n");
+                VDBG(dev, "<--- %s()\n", __func__);
+                return;
+        }
+
+        VDBG(dev, "%s-%s fifo flush\n", _ep->name, is_in(ep) ? "in" : "out");
+
+        /* flush endpoint buffer */
+        if (ep->ep_num == 0)
+                flush_bit = (1 << 16) | 1;
+        else if (is_in(ep))
+                flush_bit = 1 << (ep->ep_num + 16);     /* TX */
+        else
+                flush_bit = 1 << ep->ep_num;            /* RX */
+
+        /* wait until flush complete */
+        timeout = jiffies + FLUSH_TIMEOUT;
+        do {
+                writel(flush_bit, &dev->op_regs->endptflush);
+                while (readl(&dev->op_regs->endptflush)) {
+                        if (time_after(jiffies, timeout)) {
+                                ERROR(dev, "ep flush timeout\n");
+                                goto done;
+                        }
+                        cpu_relax();
+                }
+        } while (readl(&dev->op_regs->endptstat) & flush_bit);
+done:
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* endpoints operations structure */
+static const struct usb_ep_ops langwell_ep_ops = {
+
+        /* configure endpoint, making it usable */
+        .enable         = langwell_ep_enable,
+
+        /* endpoint is no longer usable */
+        .disable        = langwell_ep_disable,
+
+        /* allocate a request object to use with this endpoint */
+        .alloc_request  = langwell_alloc_request,
+
+        /* free a request object */
+        .free_request   = langwell_free_request,
+
+        /* queue (submits) an I/O requests to an endpoint */
+        .queue          = langwell_ep_queue,
+
+        /* dequeue (cancels, unlinks) an I/O request from an endpoint */
+        .dequeue        = langwell_ep_dequeue,
+
+        /* set the endpoint halt feature */
+        .set_halt       = langwell_ep_set_halt,
+
+        /* set the halt feature and ignores clear requests */
+        .set_wedge      = langwell_ep_set_wedge,
+
+        /* flush contents of a fifo */
+        .fifo_flush     = langwell_ep_fifo_flush,
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+/* device controller usb_gadget_ops structure */
+
+/* returns the current frame number */
+static int langwell_get_frame(struct usb_gadget *_gadget)
+{
+        struct langwell_udc     *dev;
+        u16                     retval;
+
+        if (!_gadget)
+                return -ENODEV;
+
+        dev = container_of(_gadget, struct langwell_udc, gadget);
+        VDBG(dev, "---> %s()\n", __func__);
+
+        retval = readl(&dev->op_regs->frindex) & FRINDEX_MASK;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return retval;
+}
+
+
+/* tries to wake up the host connected to this gadget */
+static int langwell_wakeup(struct usb_gadget *_gadget)
+{
+        struct langwell_udc     *dev;
+        u32                     portsc1, devlc;
+        unsigned long           flags;
+
+        if (!_gadget)
+                return 0;
+
+        dev = container_of(_gadget, struct langwell_udc, gadget);
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* Remote Wakeup feature not enabled by host */
+        if (!dev->remote_wakeup)
+                return -ENOTSUPP;
+
+        spin_lock_irqsave(&dev->lock, flags);
+
+        portsc1 = readl(&dev->op_regs->portsc1);
+        if (!(portsc1 & PORTS_SUSP)) {
+                spin_unlock_irqrestore(&dev->lock, flags);
+                return 0;
+        }
+
+        /* LPM L1 to L0, remote wakeup */
+        if (dev->lpm && dev->lpm_state == LPM_L1) {
+                portsc1 |= PORTS_SLP;
+                writel(portsc1, &dev->op_regs->portsc1);
+        }
+
+        /* force port resume */
+        if (dev->usb_state == USB_STATE_SUSPENDED) {
+                portsc1 |= PORTS_FPR;
+                writel(portsc1, &dev->op_regs->portsc1);
+        }
+
+        /* exit PHY low power suspend */
+        devlc = readl(&dev->op_regs->devlc);
+        VDBG(dev, "devlc = 0x%08x\n", devlc);
+        devlc &= ~LPM_PHCD;
+        writel(devlc, &dev->op_regs->devlc);
+
+        spin_unlock_irqrestore(&dev->lock, flags);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* notify controller that VBUS is powered or not */
+static int langwell_vbus_session(struct usb_gadget *_gadget, int is_active)
+{
+        struct langwell_udc     *dev;
+        unsigned long           flags;
+        u32                     usbcmd;
+
+        if (!_gadget)
+                return -ENODEV;
+
+        dev = container_of(_gadget, struct langwell_udc, gadget);
+        VDBG(dev, "---> %s()\n", __func__);
+
+        spin_lock_irqsave(&dev->lock, flags);
+        VDBG(dev, "VBUS status: %s\n", is_active ? "on" : "off");
+
+        dev->vbus_active = (is_active != 0);
+        if (dev->driver && dev->softconnected && dev->vbus_active) {
+                usbcmd = readl(&dev->op_regs->usbcmd);
+                usbcmd |= CMD_RUNSTOP;
+                writel(usbcmd, &dev->op_regs->usbcmd);
+        } else {
+                usbcmd = readl(&dev->op_regs->usbcmd);
+                usbcmd &= ~CMD_RUNSTOP;
+                writel(usbcmd, &dev->op_regs->usbcmd);
+        }
+
+        spin_unlock_irqrestore(&dev->lock, flags);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* constrain controller's VBUS power usage */
+static int langwell_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
+{
+        struct langwell_udc     *dev;
+
+        if (!_gadget)
+                return -ENODEV;
+
+        dev = container_of(_gadget, struct langwell_udc, gadget);
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (dev->transceiver) {
+                VDBG(dev, "otg_set_power\n");
+                VDBG(dev, "<--- %s()\n", __func__);
+                return otg_set_power(dev->transceiver, mA);
+        }
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return -ENOTSUPP;
+}
+
+
+/* D+ pullup, software-controlled connect/disconnect to USB host */
+static int langwell_pullup(struct usb_gadget *_gadget, int is_on)
+{
+        struct langwell_udc     *dev;
+        u32                     usbcmd;
+        unsigned long           flags;
+
+        if (!_gadget)
+                return -ENODEV;
+
+        dev = container_of(_gadget, struct langwell_udc, gadget);
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        spin_lock_irqsave(&dev->lock, flags);
+        dev->softconnected = (is_on != 0);
+
+        if (dev->driver && dev->softconnected && dev->vbus_active) {
+                usbcmd = readl(&dev->op_regs->usbcmd);
+                usbcmd |= CMD_RUNSTOP;
+                writel(usbcmd, &dev->op_regs->usbcmd);
+        } else {
+                usbcmd = readl(&dev->op_regs->usbcmd);
+                usbcmd &= ~CMD_RUNSTOP;
+                writel(usbcmd, &dev->op_regs->usbcmd);
+        }
+        spin_unlock_irqrestore(&dev->lock, flags);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* device controller usb_gadget_ops structure */
+static const struct usb_gadget_ops langwell_ops = {
+
+        /* returns the current frame number */
+        .get_frame      = langwell_get_frame,
+
+        /* tries to wake up the host connected to this gadget */
+        .wakeup         = langwell_wakeup,
+
+        /* set the device selfpowered feature, always selfpowered */
+        /* .set_selfpowered = langwell_set_selfpowered, */
+
+        /* notify controller that VBUS is powered or not */
+        .vbus_session   = langwell_vbus_session,
+
+        /* constrain controller's VBUS power usage */
+        .vbus_draw      = langwell_vbus_draw,
+
+        /* D+ pullup, software-controlled connect/disconnect to USB host */
+        .pullup         = langwell_pullup,
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+/* device controller operations */
+
+/* reset device controller */
+static int langwell_udc_reset(struct langwell_udc *dev)
+{
+        u32             usbcmd, usbmode, devlc, endpointlistaddr;
+        unsigned long   timeout;
+
+        if (!dev)
+                return -EINVAL;
+
+        DBG(dev, "---> %s()\n", __func__);
+
+        /* set controller to stop state */
+        usbcmd = readl(&dev->op_regs->usbcmd);
+        usbcmd &= ~CMD_RUNSTOP;
+        writel(usbcmd, &dev->op_regs->usbcmd);
+
+        /* reset device controller */
+        usbcmd = readl(&dev->op_regs->usbcmd);
+        usbcmd |= CMD_RST;
+        writel(usbcmd, &dev->op_regs->usbcmd);
+
+        /* wait for reset to complete */
+        timeout = jiffies + RESET_TIMEOUT;
+        while (readl(&dev->op_regs->usbcmd) & CMD_RST) {
+                if (time_after(jiffies, timeout)) {
+                        ERROR(dev, "device reset timeout\n");
+                        return -ETIMEDOUT;
+                }
+                cpu_relax();
+        }
+
+        /* set controller to device mode */
+        usbmode = readl(&dev->op_regs->usbmode);
+        usbmode |= MODE_DEVICE;
+
+        /* turn setup lockout off, require setup tripwire in usbcmd */
+        usbmode |= MODE_SLOM;
+
+        writel(usbmode, &dev->op_regs->usbmode);
+        usbmode = readl(&dev->op_regs->usbmode);
+        VDBG(dev, "usbmode=0x%08x\n", usbmode);
+
+        /* Write-Clear setup status */
+        writel(0, &dev->op_regs->usbsts);
+
+        /* if support USB LPM, ACK all LPM token */
+        if (dev->lpm) {
+                devlc = readl(&dev->op_regs->devlc);
+                devlc &= ~LPM_STL;      /* don't STALL LPM token */
+                devlc &= ~LPM_NYT_ACK;  /* ACK LPM token */
+                writel(devlc, &dev->op_regs->devlc);
+        }
+
+        /* fill endpointlistaddr register */
+        endpointlistaddr = dev->ep_dqh_dma;
+        endpointlistaddr &= ENDPOINTLISTADDR_MASK;
+        writel(endpointlistaddr, &dev->op_regs->endpointlistaddr);
+
+        VDBG(dev, "dQH base (vir: %p, phy: 0x%08x), endpointlistaddr=0x%08x\n",
+                        dev->ep_dqh, endpointlistaddr,
+                        readl(&dev->op_regs->endpointlistaddr));
+        DBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* reinitialize device controller endpoints */
+static int eps_reinit(struct langwell_udc *dev)
+{
+        struct langwell_ep      *ep;
+        char                    name[14];
+        int                     i;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* initialize ep0 */
+        ep = &dev->ep[0];
+        ep->dev = dev;
+        strncpy(ep->name, "ep0", sizeof(ep->name));
+        ep->ep.name = ep->name;
+        ep->ep.ops = &langwell_ep_ops;
+        ep->stopped = 0;
+        ep->ep.maxpacket = EP0_MAX_PKT_SIZE;
+        ep->ep_num = 0;
+        ep->desc = &langwell_ep0_desc;
+        INIT_LIST_HEAD(&ep->queue);
+
+        ep->ep_type = USB_ENDPOINT_XFER_CONTROL;
+
+        /* initialize other endpoints */
+        for (i = 2; i < dev->ep_max; i++) {
+                ep = &dev->ep[i];
+                if (i % 2)
+                        snprintf(name, sizeof(name), "ep%din", i / 2);
+                else
+                        snprintf(name, sizeof(name), "ep%dout", i / 2);
+                ep->dev = dev;
+                strncpy(ep->name, name, sizeof(ep->name));
+                ep->ep.name = ep->name;
+
+                ep->ep.ops = &langwell_ep_ops;
+                ep->stopped = 0;
+                ep->ep.maxpacket = (unsigned short) ~0;
+                ep->ep_num = i / 2;
+
+                INIT_LIST_HEAD(&ep->queue);
+                list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
+
+                ep->dqh = &dev->ep_dqh[i];
+        }
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* enable interrupt and set controller to run state */
+static void langwell_udc_start(struct langwell_udc *dev)
+{
+        u32     usbintr, usbcmd;
+        DBG(dev, "---> %s()\n", __func__);
+
+        /* enable interrupts */
+        usbintr = INTR_ULPIE    /* ULPI */
+                | INTR_SLE      /* suspend */
+                /* | INTR_SRE   SOF received */
+                | INTR_URE      /* USB reset */
+                | INTR_AAE      /* async advance */
+                | INTR_SEE      /* system error */
+                | INTR_FRE      /* frame list rollover */
+                | INTR_PCE      /* port change detect */
+                | INTR_UEE      /* USB error interrupt */
+                | INTR_UE;      /* USB interrupt */
+        writel(usbintr, &dev->op_regs->usbintr);
+
+        /* clear stopped bit */
+        dev->stopped = 0;
+
+        /* set controller to run */
+        usbcmd = readl(&dev->op_regs->usbcmd);
+        usbcmd |= CMD_RUNSTOP;
+        writel(usbcmd, &dev->op_regs->usbcmd);
+
+        DBG(dev, "<--- %s()\n", __func__);
+        return;
+}
+
+
+/* disable interrupt and set controller to stop state */
+static void langwell_udc_stop(struct langwell_udc *dev)
+{
+        u32     usbcmd;
+
+        DBG(dev, "---> %s()\n", __func__);
+
+        /* disable all interrupts */
+        writel(0, &dev->op_regs->usbintr);
+
+        /* set stopped bit */
+        dev->stopped = 1;
+
+        /* set controller to stop state */
+        usbcmd = readl(&dev->op_regs->usbcmd);
+        usbcmd &= ~CMD_RUNSTOP;
+        writel(usbcmd, &dev->op_regs->usbcmd);
+
+        DBG(dev, "<--- %s()\n", __func__);
+        return;
+}
+
+
+/* stop all USB activities */
+static void stop_activity(struct langwell_udc *dev,
+                struct usb_gadget_driver *driver)
+{
+        struct langwell_ep      *ep;
+        DBG(dev, "---> %s()\n", __func__);
+
+        nuke(&dev->ep[0], -ESHUTDOWN);
+
+        list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+                nuke(ep, -ESHUTDOWN);
+        }
+
+        /* report disconnect; the driver is already quiesced */
+        if (driver) {
+                spin_unlock(&dev->lock);
+                driver->disconnect(&dev->gadget);
+                spin_lock(&dev->lock);
+        }
+
+        DBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* device "function" sysfs attribute file */
+static ssize_t show_function(struct device *_dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct langwell_udc     *dev = the_controller;
+
+        if (!dev->driver || !dev->driver->function
+                        || strlen(dev->driver->function) > PAGE_SIZE)
+                return 0;
+
+        return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
+}
+static DEVICE_ATTR(function, S_IRUGO, show_function, NULL);
+
+
+/* device "langwell_udc" sysfs attribute file */
+static ssize_t show_langwell_udc(struct device *_dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct langwell_udc     *dev = the_controller;
+        struct langwell_request *req;
+        struct langwell_ep      *ep = NULL;
+        char                    *next;
+        unsigned                size;
+        unsigned                t;
+        unsigned                i;
+        unsigned long           flags;
+        u32                     tmp_reg;
+
+        next = buf;
+        size = PAGE_SIZE;
+        spin_lock_irqsave(&dev->lock, flags);
+
+        /* driver basic information */
+        t = scnprintf(next, size,
+                        DRIVER_DESC "\n"
+                        "%s version: %s\n"
+                        "Gadget driver: %s\n\n",
+                        driver_name, DRIVER_VERSION,
+                        dev->driver ? dev->driver->driver.name : "(none)");
+        size -= t;
+        next += t;
+
+        /* device registers */
+        tmp_reg = readl(&dev->op_regs->usbcmd);
+        t = scnprintf(next, size,
+                        "USBCMD reg:\n"
+                        "SetupTW: %d\n"
+                        "Run/Stop: %s\n\n",
+                        (tmp_reg & CMD_SUTW) ? 1 : 0,
+                        (tmp_reg & CMD_RUNSTOP) ? "Run" : "Stop");
+        size -= t;
+        next += t;
+
+        tmp_reg = readl(&dev->op_regs->usbsts);
+        t = scnprintf(next, size,
+                        "USB Status Reg:\n"
+                        "Device Suspend: %d\n"
+                        "Reset Received: %d\n"
+                        "System Error: %s\n"
+                        "USB Error Interrupt: %s\n\n",
+                        (tmp_reg & STS_SLI) ? 1 : 0,
+                        (tmp_reg & STS_URI) ? 1 : 0,
+                        (tmp_reg & STS_SEI) ? "Error" : "No error",
+                        (tmp_reg & STS_UEI) ? "Error detected" : "No error");
+        size -= t;
+        next += t;
+
+        tmp_reg = readl(&dev->op_regs->usbintr);
+        t = scnprintf(next, size,
+                        "USB Intrrupt Enable Reg:\n"
+                        "Sleep Enable: %d\n"
+                        "SOF Received Enable: %d\n"
+                        "Reset Enable: %d\n"
+                        "System Error Enable: %d\n"
+                        "Port Change Dectected Enable: %d\n"
+                        "USB Error Intr Enable: %d\n"
+                        "USB Intr Enable: %d\n\n",
+                        (tmp_reg & INTR_SLE) ? 1 : 0,
+                        (tmp_reg & INTR_SRE) ? 1 : 0,
+                        (tmp_reg & INTR_URE) ? 1 : 0,
+                        (tmp_reg & INTR_SEE) ? 1 : 0,
+                        (tmp_reg & INTR_PCE) ? 1 : 0,
+                        (tmp_reg & INTR_UEE) ? 1 : 0,
+                        (tmp_reg & INTR_UE) ? 1 : 0);
+        size -= t;
+        next += t;
+
+        tmp_reg = readl(&dev->op_regs->frindex);
+        t = scnprintf(next, size,
+                        "USB Frame Index Reg:\n"
+                        "Frame Number is 0x%08x\n\n",
+                        (tmp_reg & FRINDEX_MASK));
+        size -= t;
+        next += t;
+
+        tmp_reg = readl(&dev->op_regs->deviceaddr);
+        t = scnprintf(next, size,
+                        "USB Device Address Reg:\n"
+                        "Device Addr is 0x%x\n\n",
+                        USBADR(tmp_reg));
+        size -= t;
+        next += t;
+
+        tmp_reg = readl(&dev->op_regs->endpointlistaddr);
+        t = scnprintf(next, size,
+                        "USB Endpoint List Address Reg:\n"
+                        "Endpoint List Pointer is 0x%x\n\n",
+                        EPBASE(tmp_reg));
+        size -= t;
+        next += t;
+
+        tmp_reg = readl(&dev->op_regs->portsc1);
+        t = scnprintf(next, size,
+                "USB Port Status & Control Reg:\n"
+                "Port Reset: %s\n"
+                "Port Suspend Mode: %s\n"
+                "Over-current Change: %s\n"
+                "Port Enable/Disable Change: %s\n"
+                "Port Enabled/Disabled: %s\n"
+                "Current Connect Status: %s\n\n",
+                (tmp_reg & PORTS_PR) ? "Reset" : "Not Reset",
+                (tmp_reg & PORTS_SUSP) ? "Suspend " : "Not Suspend",
+                (tmp_reg & PORTS_OCC) ? "Detected" : "No",
+                (tmp_reg & PORTS_PEC) ? "Changed" : "Not Changed",
+                (tmp_reg & PORTS_PE) ? "Enable" : "Not Correct",
+                (tmp_reg & PORTS_CCS) ?  "Attached" : "Not Attached");
+        size -= t;
+        next += t;
+
+        tmp_reg = readl(&dev->op_regs->devlc);
+        t = scnprintf(next, size,
+                "Device LPM Control Reg:\n"
+                "Parallel Transceiver : %d\n"
+                "Serial Transceiver : %d\n"
+                "Port Speed: %s\n"
+                "Port Force Full Speed Connenct: %s\n"
+                "PHY Low Power Suspend Clock Disable: %s\n"
+                "BmAttributes: %d\n\n",
+                LPM_PTS(tmp_reg),
+                (tmp_reg & LPM_STS) ? 1 : 0,
+                ({
+                        char    *s;
+                        switch (LPM_PSPD(tmp_reg)) {
+                        case LPM_SPEED_FULL:
+                                s = "Full Speed"; break;
+                        case LPM_SPEED_LOW:
+                                s = "Low Speed"; break;
+                        case LPM_SPEED_HIGH:
+                                s = "High Speed"; break;
+                        default:
+                                s = "Unknown Speed"; break;
+                        }
+                        s;
+                }),
+                (tmp_reg & LPM_PFSC) ? "Force Full Speed" : "Not Force",
+                (tmp_reg & LPM_PHCD) ? "Disabled" : "Enabled",
+                LPM_BA(tmp_reg));
+        size -= t;
+        next += t;
+
+        tmp_reg = readl(&dev->op_regs->usbmode);
+        t = scnprintf(next, size,
+                        "USB Mode Reg:\n"
+                        "Controller Mode is : %s\n\n", ({
+                                char *s;
+                                switch (MODE_CM(tmp_reg)) {
+                                case MODE_IDLE:
+                                        s = "Idle"; break;
+                                case MODE_DEVICE:
+                                        s = "Device Controller"; break;
+                                case MODE_HOST:
+                                        s = "Host Controller"; break;
+                                default:
+                                        s = "None"; break;
+                                }
+                                s;
+                        }));
+        size -= t;
+        next += t;
+
+        tmp_reg = readl(&dev->op_regs->endptsetupstat);
+        t = scnprintf(next, size,
+                        "Endpoint Setup Status Reg:\n"
+                        "SETUP on ep 0x%04x\n\n",
+                        tmp_reg & SETUPSTAT_MASK);
+        size -= t;
+        next += t;
+
+        for (i = 0; i < dev->ep_max / 2; i++) {
+                tmp_reg = readl(&dev->op_regs->endptctrl[i]);
+                t = scnprintf(next, size, "EP Ctrl Reg [%d]: 0x%08x\n",
+                                i, tmp_reg);
+                size -= t;
+                next += t;
+        }
+        tmp_reg = readl(&dev->op_regs->endptprime);
+        t = scnprintf(next, size, "EP Prime Reg: 0x%08x\n\n", tmp_reg);
+        size -= t;
+        next += t;
+
+        /* langwell_udc, langwell_ep, langwell_request structure information */
+        ep = &dev->ep[0];
+        t = scnprintf(next, size, "%s MaxPacketSize: 0x%x, ep_num: %d\n",
+                        ep->ep.name, ep->ep.maxpacket, ep->ep_num);
+        size -= t;
+        next += t;
+
+        if (list_empty(&ep->queue)) {
+                t = scnprintf(next, size, "its req queue is empty\n\n");
+                size -= t;
+                next += t;
+        } else {
+                list_for_each_entry(req, &ep->queue, queue) {
+                        t = scnprintf(next, size,
+                                "req %p actual 0x%x length 0x%x  buf %p\n",
+                                &req->req, req->req.actual,
+                                req->req.length, req->req.buf);
+                        size -= t;
+                        next += t;
+                }
+        }
+        /* other gadget->eplist ep */
+        list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+                if (ep->desc) {
+                        t = scnprintf(next, size,
+                                        "\n%s MaxPacketSize: 0x%x, "
+                                        "ep_num: %d\n",
+                                        ep->ep.name, ep->ep.maxpacket,
+                                        ep->ep_num);
+                        size -= t;
+                        next += t;
+
+                        if (list_empty(&ep->queue)) {
+                                t = scnprintf(next, size,
+                                                "its req queue is empty\n\n");
+                                size -= t;
+                                next += t;
+                        } else {
+                                list_for_each_entry(req, &ep->queue, queue) {
+                                        t = scnprintf(next, size,
+                                                "req %p actual 0x%x length "
+                                                "0x%x  buf %p\n",
+                                                &req->req, req->req.actual,
+                                                req->req.length, req->req.buf);
+                                        size -= t;
+                                        next += t;
+                                }
+                        }
+                }
+        }
+
+        spin_unlock_irqrestore(&dev->lock, flags);
+        return PAGE_SIZE - size;
+}
+static DEVICE_ATTR(langwell_udc, S_IRUGO, show_langwell_udc, NULL);
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * when a driver is successfully registered, it will receive
+ * control requests including set_configuration(), which enables
+ * non-control requests.  then usb traffic follows until a
+ * disconnect is reported.  then a host may connect again, or
+ * the driver might get unbound.
+ */
+
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+        struct langwell_udc     *dev = the_controller;
+        unsigned long           flags;
+        int                     retval;
+
+        if (!dev)
+                return -ENODEV;
+
+        DBG(dev, "---> %s()\n", __func__);
+
+        if (dev->driver)
+                return -EBUSY;
+
+        spin_lock_irqsave(&dev->lock, flags);
+
+        /* hook up the driver ... */
+        driver->driver.bus = NULL;
+        dev->driver = driver;
+        dev->gadget.dev.driver = &driver->driver;
+
+        spin_unlock_irqrestore(&dev->lock, flags);
+
+        retval = driver->bind(&dev->gadget);
+        if (retval) {
+                DBG(dev, "bind to driver %s --> %d\n",
+                                driver->driver.name, retval);
+                dev->driver = NULL;
+                dev->gadget.dev.driver = NULL;
+                return retval;
+        }
+
+        retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
+        if (retval)
+                goto err_unbind;
+
+        dev->usb_state = USB_STATE_ATTACHED;
+        dev->ep0_state = WAIT_FOR_SETUP;
+        dev->ep0_dir = USB_DIR_OUT;
+
+        /* enable interrupt and set controller to run state */
+        if (dev->got_irq)
+                langwell_udc_start(dev);
+
+        VDBG(dev, "After langwell_udc_start(), print all registers:\n");
+#ifdef  VERBOSE
+        print_all_registers(dev);
+#endif
+
+        INFO(dev, "register driver: %s\n", driver->driver.name);
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+
+err_unbind:
+        driver->unbind(&dev->gadget);
+        dev->gadget.dev.driver = NULL;
+        dev->driver = NULL;
+
+        DBG(dev, "<--- %s()\n", __func__);
+        return retval;
+}
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+
+/* unregister gadget driver */
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+        struct langwell_udc     *dev = the_controller;
+        unsigned long           flags;
+
+        if (!dev)
+                return -ENODEV;
+
+        DBG(dev, "---> %s()\n", __func__);
+
+        if (unlikely(!driver || !driver->bind || !driver->unbind))
+                return -EINVAL;
+
+        /* unbind OTG transceiver */
+        if (dev->transceiver)
+                (void)otg_set_peripheral(dev->transceiver, 0);
+
+        /* disable interrupt and set controller to stop state */
+        langwell_udc_stop(dev);
+
+        dev->usb_state = USB_STATE_ATTACHED;
+        dev->ep0_state = WAIT_FOR_SETUP;
+        dev->ep0_dir = USB_DIR_OUT;
+
+        spin_lock_irqsave(&dev->lock, flags);
+
+        /* stop all usb activities */
+        dev->gadget.speed = USB_SPEED_UNKNOWN;
+        stop_activity(dev, driver);
+        spin_unlock_irqrestore(&dev->lock, flags);
+
+        /* unbind gadget driver */
+        driver->unbind(&dev->gadget);
+        dev->gadget.dev.driver = NULL;
+        dev->driver = NULL;
+
+        device_remove_file(&dev->pdev->dev, &dev_attr_function);
+
+        INFO(dev, "unregistered driver '%s'\n", driver->driver.name);
+        DBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * setup tripwire is used as a semaphore to ensure that the setup data
+ * payload is extracted from a dQH without being corrupted
+ */
+static void setup_tripwire(struct langwell_udc *dev)
+{
+        u32                     usbcmd,
+                                endptsetupstat;
+        unsigned long           timeout;
+        struct langwell_dqh     *dqh;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* ep0 OUT dQH */
+        dqh = &dev->ep_dqh[EP_DIR_OUT];
+
+        /* Write-Clear endptsetupstat */
+        endptsetupstat = readl(&dev->op_regs->endptsetupstat);
+        writel(endptsetupstat, &dev->op_regs->endptsetupstat);
+
+        /* wait until endptsetupstat is cleared */
+        timeout = jiffies + SETUPSTAT_TIMEOUT;
+        while (readl(&dev->op_regs->endptsetupstat)) {
+                if (time_after(jiffies, timeout)) {
+                        ERROR(dev, "setup_tripwire timeout\n");
+                        break;
+                }
+                cpu_relax();
+        }
+
+        /* while a hazard exists when setup packet arrives */
+        do {
+                /* set setup tripwire bit */
+                usbcmd = readl(&dev->op_regs->usbcmd);
+                writel(usbcmd | CMD_SUTW, &dev->op_regs->usbcmd);
+
+                /* copy the setup packet to local buffer */
+                memcpy(&dev->local_setup_buff, &dqh->dqh_setup, 8);
+        } while (!(readl(&dev->op_regs->usbcmd) & CMD_SUTW));
+
+        /* Write-Clear setup tripwire bit */
+        usbcmd = readl(&dev->op_regs->usbcmd);
+        writel(usbcmd & ~CMD_SUTW, &dev->op_regs->usbcmd);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* protocol ep0 stall, will automatically be cleared on new transaction */
+static void ep0_stall(struct langwell_udc *dev)
+{
+        u32     endptctrl;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* set TX and RX to stall */
+        endptctrl = readl(&dev->op_regs->endptctrl[0]);
+        endptctrl |= EPCTRL_TXS | EPCTRL_RXS;
+        writel(endptctrl, &dev->op_regs->endptctrl[0]);
+
+        /* update ep0 state */
+        dev->ep0_state = WAIT_FOR_SETUP;
+        dev->ep0_dir = USB_DIR_OUT;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* PRIME a status phase for ep0 */
+static int prime_status_phase(struct langwell_udc *dev, int dir)
+{
+        struct langwell_request *req;
+        struct langwell_ep      *ep;
+        int                     status = 0;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (dir == EP_DIR_IN)
+                dev->ep0_dir = USB_DIR_IN;
+        else
+                dev->ep0_dir = USB_DIR_OUT;
+
+        ep = &dev->ep[0];
+        dev->ep0_state = WAIT_FOR_OUT_STATUS;
+
+        req = dev->status_req;
+
+        req->ep = ep;
+        req->req.length = 0;
+        req->req.status = -EINPROGRESS;
+        req->req.actual = 0;
+        req->req.complete = NULL;
+        req->dtd_count = 0;
+
+        if (!req_to_dtd(req))
+                status = queue_dtd(ep, req);
+        else
+                return -ENOMEM;
+
+        if (status)
+                ERROR(dev, "can't queue ep0 status request\n");
+
+        list_add_tail(&req->queue, &ep->queue);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return status;
+}
+
+
+/* SET_ADDRESS request routine */
+static void set_address(struct langwell_udc *dev, u16 value,
+                u16 index, u16 length)
+{
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* save the new address to device struct */
+        dev->dev_addr = (u8) value;
+        VDBG(dev, "dev->dev_addr = %d\n", dev->dev_addr);
+
+        /* update usb state */
+        dev->usb_state = USB_STATE_ADDRESS;
+
+        /* STATUS phase */
+        if (prime_status_phase(dev, EP_DIR_IN))
+                ep0_stall(dev);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* return endpoint by windex */
+static struct langwell_ep *get_ep_by_windex(struct langwell_udc *dev,
+                u16 wIndex)
+{
+        struct langwell_ep              *ep;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
+                return &dev->ep[0];
+
+        list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+                u8      bEndpointAddress;
+                if (!ep->desc)
+                        continue;
+
+                bEndpointAddress = ep->desc->bEndpointAddress;
+                if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
+                        continue;
+
+                if ((wIndex & USB_ENDPOINT_NUMBER_MASK)
+                        == (bEndpointAddress & USB_ENDPOINT_NUMBER_MASK))
+                        return ep;
+        }
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return NULL;
+}
+
+
+/* return whether endpoint is stalled, 0: not stalled; 1: stalled */
+static int ep_is_stall(struct langwell_ep *ep)
+{
+        struct langwell_udc     *dev = ep->dev;
+        u32                     endptctrl;
+        int                     retval;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        endptctrl = readl(&dev->op_regs->endptctrl[ep->ep_num]);
+        if (is_in(ep))
+                retval = endptctrl & EPCTRL_TXS ? 1 : 0;
+        else
+                retval = endptctrl & EPCTRL_RXS ? 1 : 0;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return retval;
+}
+
+
+/* GET_STATUS request routine */
+static void get_status(struct langwell_udc *dev, u8 request_type, u16 value,
+                u16 index, u16 length)
+{
+        struct langwell_request *req;
+        struct langwell_ep      *ep;
+        u16     status_data = 0;        /* 16 bits cpu view status data */
+        int     status = 0;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        ep = &dev->ep[0];
+
+        if ((request_type & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
+                /* get device status */
+                status_data = 1 << USB_DEVICE_SELF_POWERED;
+                status_data |= dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP;
+        } else if ((request_type & USB_RECIP_MASK) == USB_RECIP_INTERFACE) {
+                /* get interface status */
+                status_data = 0;
+        } else if ((request_type & USB_RECIP_MASK) == USB_RECIP_ENDPOINT) {
+                /* get endpoint status */
+                struct langwell_ep      *epn;
+                epn = get_ep_by_windex(dev, index);
+                /* stall if endpoint doesn't exist */
+                if (!epn)
+                        goto stall;
+
+                status_data = ep_is_stall(epn) << USB_ENDPOINT_HALT;
+        }
+
+        dev->ep0_dir = USB_DIR_IN;
+
+        /* borrow the per device status_req */
+        req = dev->status_req;
+
+        /* fill in the reqest structure */
+        *((u16 *) req->req.buf) = cpu_to_le16(status_data);
+        req->ep = ep;
+        req->req.length = 2;
+        req->req.status = -EINPROGRESS;
+        req->req.actual = 0;
+        req->req.complete = NULL;
+        req->dtd_count = 0;
+
+        /* prime the data phase */
+        if (!req_to_dtd(req))
+                status = queue_dtd(ep, req);
+        else                    /* no mem */
+                goto stall;
+
+        if (status) {
+                ERROR(dev, "response error on GET_STATUS request\n");
+                goto stall;
+        }
+
+        list_add_tail(&req->queue, &ep->queue);
+        dev->ep0_state = DATA_STATE_XMIT;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return;
+stall:
+        ep0_stall(dev);
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* setup packet interrupt handler */
+static void handle_setup_packet(struct langwell_udc *dev,
+                struct usb_ctrlrequest *setup)
+{
+        u16     wValue = le16_to_cpu(setup->wValue);
+        u16     wIndex = le16_to_cpu(setup->wIndex);
+        u16     wLength = le16_to_cpu(setup->wLength);
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* ep0 fifo flush */
+        nuke(&dev->ep[0], -ESHUTDOWN);
+
+        DBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
+                        setup->bRequestType, setup->bRequest,
+                        wValue, wIndex, wLength);
+
+        /* RNDIS gadget delegate */
+        if ((setup->bRequestType == 0x21) && (setup->bRequest == 0x00)) {
+                /* USB_CDC_SEND_ENCAPSULATED_COMMAND */
+                goto delegate;
+        }
+
+        /* USB_CDC_GET_ENCAPSULATED_RESPONSE */
+        if ((setup->bRequestType == 0xa1) && (setup->bRequest == 0x01)) {
+                /* USB_CDC_GET_ENCAPSULATED_RESPONSE */
+                goto delegate;
+        }
+
+        /* We process some stardard setup requests here */
+        switch (setup->bRequest) {
+        case USB_REQ_GET_STATUS:
+                DBG(dev, "SETUP: USB_REQ_GET_STATUS\n");
+                /* get status, DATA and STATUS phase */
+                if ((setup->bRequestType & (USB_DIR_IN | USB_TYPE_MASK))
+                                        != (USB_DIR_IN | USB_TYPE_STANDARD))
+                        break;
+                get_status(dev, setup->bRequestType, wValue, wIndex, wLength);
+                goto end;
+
+        case USB_REQ_SET_ADDRESS:
+                DBG(dev, "SETUP: USB_REQ_SET_ADDRESS\n");
+                /* STATUS phase */
+                if (setup->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD
+                                                | USB_RECIP_DEVICE))
+                        break;
+                set_address(dev, wValue, wIndex, wLength);
+                goto end;
+
+        case USB_REQ_CLEAR_FEATURE:
+        case USB_REQ_SET_FEATURE:
+                /* STATUS phase */
+        {
+                int rc = -EOPNOTSUPP;
+                if (setup->bRequest == USB_REQ_SET_FEATURE)
+                        DBG(dev, "SETUP: USB_REQ_SET_FEATURE\n");
+                else if (setup->bRequest == USB_REQ_CLEAR_FEATURE)
+                        DBG(dev, "SETUP: USB_REQ_CLEAR_FEATURE\n");
+
+                if ((setup->bRequestType & (USB_RECIP_MASK | USB_TYPE_MASK))
+                                == (USB_RECIP_ENDPOINT | USB_TYPE_STANDARD)) {
+                        struct langwell_ep      *epn;
+                        epn = get_ep_by_windex(dev, wIndex);
+                        /* stall if endpoint doesn't exist */
+                        if (!epn) {
+                                ep0_stall(dev);
+                                goto end;
+                        }
+
+                        if (wValue != 0 || wLength != 0
+                                        || epn->ep_num > dev->ep_max)
+                                break;
+
+                        spin_unlock(&dev->lock);
+                        rc = langwell_ep_set_halt(&epn->ep,
+                                        (setup->bRequest == USB_REQ_SET_FEATURE)
+                                                ? 1 : 0);
+                        spin_lock(&dev->lock);
+
+                } else if ((setup->bRequestType & (USB_RECIP_MASK
+                                | USB_TYPE_MASK)) == (USB_RECIP_DEVICE
+                                | USB_TYPE_STANDARD)) {
+                        if (!gadget_is_otg(&dev->gadget))
+                                break;
+                        else if (setup->bRequest == USB_DEVICE_B_HNP_ENABLE) {
+                                dev->gadget.b_hnp_enable = 1;
+#ifdef  OTG_TRANSCEIVER
+                                if (!dev->lotg->otg.default_a)
+                                        dev->lotg->hsm.b_hnp_enable = 1;
+#endif
+                        } else if (setup->bRequest == USB_DEVICE_A_HNP_SUPPORT)
+                                dev->gadget.a_hnp_support = 1;
+                        else if (setup->bRequest ==
+                                        USB_DEVICE_A_ALT_HNP_SUPPORT)
+                                dev->gadget.a_alt_hnp_support = 1;
+                        else
+                                break;
+                        rc = 0;
+                } else
+                        break;
+
+                if (rc == 0) {
+                        if (prime_status_phase(dev, EP_DIR_IN))
+                                ep0_stall(dev);
+                }
+                goto end;
+        }
+
+        case USB_REQ_GET_DESCRIPTOR:
+                DBG(dev, "SETUP: USB_REQ_GET_DESCRIPTOR\n");
+                goto delegate;
+
+        case USB_REQ_SET_DESCRIPTOR:
+                DBG(dev, "SETUP: USB_REQ_SET_DESCRIPTOR unsupported\n");
+                goto delegate;
+
+        case USB_REQ_GET_CONFIGURATION:
+                DBG(dev, "SETUP: USB_REQ_GET_CONFIGURATION\n");
+                goto delegate;
+
+        case USB_REQ_SET_CONFIGURATION:
+                DBG(dev, "SETUP: USB_REQ_SET_CONFIGURATION\n");
+                goto delegate;
+
+        case USB_REQ_GET_INTERFACE:
+                DBG(dev, "SETUP: USB_REQ_GET_INTERFACE\n");
+                goto delegate;
+
+        case USB_REQ_SET_INTERFACE:
+                DBG(dev, "SETUP: USB_REQ_SET_INTERFACE\n");
+                goto delegate;
+
+        case USB_REQ_SYNCH_FRAME:
+                DBG(dev, "SETUP: USB_REQ_SYNCH_FRAME unsupported\n");
+                goto delegate;
+
+        default:
+                /* delegate USB standard requests to the gadget driver */
+                goto delegate;
+delegate:
+                /* USB requests handled by gadget */
+                if (wLength) {
+                        /* DATA phase from gadget, STATUS phase from udc */
+                        dev->ep0_dir = (setup->bRequestType & USB_DIR_IN)
+                                        ?  USB_DIR_IN : USB_DIR_OUT;
+                        VDBG(dev, "dev->ep0_dir = 0x%x, wLength = %d\n",
+                                        dev->ep0_dir, wLength);
+                        spin_unlock(&dev->lock);
+                        if (dev->driver->setup(&dev->gadget,
+                                        &dev->local_setup_buff) < 0)
+                                ep0_stall(dev);
+                        spin_lock(&dev->lock);
+                        dev->ep0_state = (setup->bRequestType & USB_DIR_IN)
+                                        ?  DATA_STATE_XMIT : DATA_STATE_RECV;
+                } else {
+                        /* no DATA phase, IN STATUS phase from gadget */
+                        dev->ep0_dir = USB_DIR_IN;
+                        VDBG(dev, "dev->ep0_dir = 0x%x, wLength = %d\n",
+                                        dev->ep0_dir, wLength);
+                        spin_unlock(&dev->lock);
+                        if (dev->driver->setup(&dev->gadget,
+                                        &dev->local_setup_buff) < 0)
+                                ep0_stall(dev);
+                        spin_lock(&dev->lock);
+                        dev->ep0_state = WAIT_FOR_OUT_STATUS;
+                }
+                break;
+        }
+end:
+        VDBG(dev, "<--- %s()\n", __func__);
+        return;
+}
+
+
+/* transfer completion, process endpoint request and free the completed dTDs
+ * for this request
+ */
+static int process_ep_req(struct langwell_udc *dev, int index,
+                struct langwell_request *curr_req)
+{
+        struct langwell_dtd     *curr_dtd;
+        struct langwell_dqh     *curr_dqh;
+        int                     td_complete, actual, remaining_length;
+        int                     i, dir;
+        u8                      dtd_status = 0;
+        int                     retval = 0;
+
+        curr_dqh = &dev->ep_dqh[index];
+        dir = index % 2;
+
+        curr_dtd = curr_req->head;
+        td_complete = 0;
+        actual = curr_req->req.length;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        for (i = 0; i < curr_req->dtd_count; i++) {
+                remaining_length = le16_to_cpu(curr_dtd->dtd_total);
+                actual -= remaining_length;
+
+                /* command execution states by dTD */
+                dtd_status = curr_dtd->dtd_status;
+
+                if (!dtd_status) {
+                        /* transfers completed successfully */
+                        if (!remaining_length) {
+                                td_complete++;
+                                VDBG(dev, "dTD transmitted successfully\n");
+                        } else {
+                                if (dir) {
+                                        VDBG(dev, "TX dTD remains data\n");
+                                        retval = -EPROTO;
+                                        break;
+
+                                } else {
+                                        td_complete++;
+                                        break;
+                                }
+                        }
+                } else {
+                        /* transfers completed with errors */
+                        if (dtd_status & DTD_STS_ACTIVE) {
+                                DBG(dev, "request not completed\n");
+                                retval = 1;
+                                return retval;
+                        } else if (dtd_status & DTD_STS_HALTED) {
+                                ERROR(dev, "dTD error %08x dQH[%d]\n",
+                                                dtd_status, index);
+                                /* clear the errors and halt condition */
+                                curr_dqh->dtd_status = 0;
+                                retval = -EPIPE;
+                                break;
+                        } else if (dtd_status & DTD_STS_DBE) {
+                                DBG(dev, "data buffer (overflow) error\n");
+                                retval = -EPROTO;
+                                break;
+                        } else if (dtd_status & DTD_STS_TRE) {
+                                DBG(dev, "transaction(ISO) error\n");
+                                retval = -EILSEQ;
+                                break;
+                        } else
+                                ERROR(dev, "unknown error (0x%x)!\n",
+                                                dtd_status);
+                }
+
+                if (i != curr_req->dtd_count - 1)
+                        curr_dtd = (struct langwell_dtd *)
+                                curr_dtd->next_dtd_virt;
+        }
+
+        if (retval)
+                return retval;
+
+        curr_req->req.actual = actual;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* complete DATA or STATUS phase of ep0 prime status phase if needed */
+static void ep0_req_complete(struct langwell_udc *dev,
+                struct langwell_ep *ep0, struct langwell_request *req)
+{
+        u32     new_addr;
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (dev->usb_state == USB_STATE_ADDRESS) {
+                /* set the new address */
+                new_addr = (u32)dev->dev_addr;
+                writel(new_addr << USBADR_SHIFT, &dev->op_regs->deviceaddr);
+
+                new_addr = USBADR(readl(&dev->op_regs->deviceaddr));
+                VDBG(dev, "new_addr = %d\n", new_addr);
+        }
+
+        done(ep0, req, 0);
+
+        switch (dev->ep0_state) {
+        case DATA_STATE_XMIT:
+                /* receive status phase */
+                if (prime_status_phase(dev, EP_DIR_OUT))
+                        ep0_stall(dev);
+                break;
+        case DATA_STATE_RECV:
+                /* send status phase */
+                if (prime_status_phase(dev, EP_DIR_IN))
+                        ep0_stall(dev);
+                break;
+        case WAIT_FOR_OUT_STATUS:
+                dev->ep0_state = WAIT_FOR_SETUP;
+                break;
+        case WAIT_FOR_SETUP:
+                ERROR(dev, "unexpect ep0 packets\n");
+                break;
+        default:
+                ep0_stall(dev);
+                break;
+        }
+
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB transfer completion interrupt */
+static void handle_trans_complete(struct langwell_udc *dev)
+{
+        u32                     complete_bits;
+        int                     i, ep_num, dir, bit_mask, status;
+        struct langwell_ep      *epn;
+        struct langwell_request *curr_req, *temp_req;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        complete_bits = readl(&dev->op_regs->endptcomplete);
+        VDBG(dev, "endptcomplete register: 0x%08x\n", complete_bits);
+
+        /* Write-Clear the bits in endptcomplete register */
+        writel(complete_bits, &dev->op_regs->endptcomplete);
+
+        if (!complete_bits) {
+                DBG(dev, "complete_bits = 0\n");
+                goto done;
+        }
+
+        for (i = 0; i < dev->ep_max; i++) {
+                ep_num = i / 2;
+                dir = i % 2;
+
+                bit_mask = 1 << (ep_num + 16 * dir);
+
+                if (!(complete_bits & bit_mask))
+                        continue;
+
+                /* ep0 */
+                if (i == 1)
+                        epn = &dev->ep[0];
+                else
+                        epn = &dev->ep[i];
+
+                if (epn->name == NULL) {
+                        WARNING(dev, "invalid endpoint\n");
+                        continue;
+                }
+
+                if (i < 2)
+                        /* ep0 in and out */
+                        DBG(dev, "%s-%s transfer completed\n",
+                                        epn->name,
+                                        is_in(epn) ? "in" : "out");
+                else
+                        DBG(dev, "%s transfer completed\n", epn->name);
+
+                /* process the req queue until an uncomplete request */
+                list_for_each_entry_safe(curr_req, temp_req,
+                                &epn->queue, queue) {
+                        status = process_ep_req(dev, i, curr_req);
+                        VDBG(dev, "%s req status: %d\n", epn->name, status);
+
+                        if (status)
+                                break;
+
+                        /* write back status to req */
+                        curr_req->req.status = status;
+
+                        /* ep0 request completion */
+                        if (ep_num == 0) {
+                                ep0_req_complete(dev, epn, curr_req);
+                                break;
+                        } else {
+                                done(epn, curr_req, status);
+                        }
+                }
+        }
+done:
+        VDBG(dev, "<--- %s()\n", __func__);
+        return;
+}
+
+
+/* port change detect interrupt handler */
+static void handle_port_change(struct langwell_udc *dev)
+{
+        u32     portsc1, devlc;
+        u32     speed;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (dev->bus_reset)
+                dev->bus_reset = 0;
+
+        portsc1 = readl(&dev->op_regs->portsc1);
+        devlc = readl(&dev->op_regs->devlc);
+        VDBG(dev, "portsc1 = 0x%08x, devlc = 0x%08x\n",
+                        portsc1, devlc);
+
+        /* bus reset is finished */
+        if (!(portsc1 & PORTS_PR)) {
+                /* get the speed */
+                speed = LPM_PSPD(devlc);
+                switch (speed) {
+                case LPM_SPEED_HIGH:
+                        dev->gadget.speed = USB_SPEED_HIGH;
+                        break;
+                case LPM_SPEED_FULL:
+                        dev->gadget.speed = USB_SPEED_FULL;
+                        break;
+                case LPM_SPEED_LOW:
+                        dev->gadget.speed = USB_SPEED_LOW;
+                        break;
+                default:
+                        dev->gadget.speed = USB_SPEED_UNKNOWN;
+                        break;
+                }
+                VDBG(dev, "speed = %d, dev->gadget.speed = %d\n",
+                                speed, dev->gadget.speed);
+        }
+
+        /* LPM L0 to L1 */
+        if (dev->lpm && dev->lpm_state == LPM_L0)
+                if (portsc1 & PORTS_SUSP && portsc1 & PORTS_SLP) {
+                                INFO(dev, "LPM L0 to L1\n");
+                                dev->lpm_state = LPM_L1;
+                }
+
+        /* LPM L1 to L0, force resume or remote wakeup finished */
+        if (dev->lpm && dev->lpm_state == LPM_L1)
+                if (!(portsc1 & PORTS_SUSP)) {
+                        if (portsc1 & PORTS_SLP)
+                                INFO(dev, "LPM L1 to L0, force resume\n");
+                        else
+                                INFO(dev, "LPM L1 to L0, remote wakeup\n");
+
+                        dev->lpm_state = LPM_L0;
+                }
+
+        /* update USB state */
+        if (!dev->resume_state)
+                dev->usb_state = USB_STATE_DEFAULT;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB reset interrupt handler */
+static void handle_usb_reset(struct langwell_udc *dev)
+{
+        u32             deviceaddr,
+                        endptsetupstat,
+                        endptcomplete;
+        unsigned long   timeout;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        /* Write-Clear the device address */
+        deviceaddr = readl(&dev->op_regs->deviceaddr);
+        writel(deviceaddr & ~USBADR_MASK, &dev->op_regs->deviceaddr);
+
+        dev->dev_addr = 0;
+
+        /* clear usb state */
+        dev->resume_state = 0;
+
+        /* LPM L1 to L0, reset */
+        if (dev->lpm)
+                dev->lpm_state = LPM_L0;
+
+        dev->ep0_dir = USB_DIR_OUT;
+        dev->ep0_state = WAIT_FOR_SETUP;
+        dev->remote_wakeup = 0;         /* default to 0 on reset */
+        dev->gadget.b_hnp_enable = 0;
+        dev->gadget.a_hnp_support = 0;
+        dev->gadget.a_alt_hnp_support = 0;
+
+        /* Write-Clear all the setup token semaphores */
+        endptsetupstat = readl(&dev->op_regs->endptsetupstat);
+        writel(endptsetupstat, &dev->op_regs->endptsetupstat);
+
+        /* Write-Clear all the endpoint complete status bits */
+        endptcomplete = readl(&dev->op_regs->endptcomplete);
+        writel(endptcomplete, &dev->op_regs->endptcomplete);
+
+        /* wait until all endptprime bits cleared */
+        timeout = jiffies + PRIME_TIMEOUT;
+        while (readl(&dev->op_regs->endptprime)) {
+                if (time_after(jiffies, timeout)) {
+                        ERROR(dev, "USB reset timeout\n");
+                        break;
+                }
+                cpu_relax();
+        }
+
+        /* write 1s to endptflush register to clear any primed buffers */
+        writel((u32) ~0, &dev->op_regs->endptflush);
+
+        if (readl(&dev->op_regs->portsc1) & PORTS_PR) {
+                VDBG(dev, "USB bus reset\n");
+                /* bus is reseting */
+                dev->bus_reset = 1;
+
+                /* reset all the queues, stop all USB activities */
+                stop_activity(dev, dev->driver);
+                dev->usb_state = USB_STATE_DEFAULT;
+        } else {
+                VDBG(dev, "device controller reset\n");
+                /* controller reset */
+                langwell_udc_reset(dev);
+
+                /* reset all the queues, stop all USB activities */
+                stop_activity(dev, dev->driver);
+
+                /* reset ep0 dQH and endptctrl */
+                ep0_reset(dev);
+
+                /* enable interrupt and set controller to run state */
+                langwell_udc_start(dev);
+
+                dev->usb_state = USB_STATE_ATTACHED;
+        }
+
+#ifdef  OTG_TRANSCEIVER
+        /* refer to USB OTG 6.6.2.3 b_hnp_en is cleared */
+        if (!dev->lotg->otg.default_a)
+                dev->lotg->hsm.b_hnp_enable = 0;
+#endif
+
+        VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB bus suspend/resume interrupt */
+static void handle_bus_suspend(struct langwell_udc *dev)
+{
+        u32             devlc;
+        DBG(dev, "---> %s()\n", __func__);
+
+        dev->resume_state = dev->usb_state;
+        dev->usb_state = USB_STATE_SUSPENDED;
+
+#ifdef  OTG_TRANSCEIVER
+        if (dev->lotg->otg.default_a) {
+                if (dev->lotg->hsm.b_bus_suspend_vld == 1) {
+                        dev->lotg->hsm.b_bus_suspend = 1;
+                        /* notify transceiver the state changes */
+                        if (spin_trylock(&dev->lotg->wq_lock)) {
+                                langwell_update_transceiver();
+                                spin_unlock(&dev->lotg->wq_lock);
+                        }
+                }
+                dev->lotg->hsm.b_bus_suspend_vld++;
+        } else {
+                if (!dev->lotg->hsm.a_bus_suspend) {
+                        dev->lotg->hsm.a_bus_suspend = 1;
+                        /* notify transceiver the state changes */
+                        if (spin_trylock(&dev->lotg->wq_lock)) {
+                                langwell_update_transceiver();
+                                spin_unlock(&dev->lotg->wq_lock);
+                        }
+                }
+        }
+#endif
+
+        /* report suspend to the driver */
+        if (dev->driver) {
+                if (dev->driver->suspend) {
+                        spin_unlock(&dev->lock);
+                        dev->driver->suspend(&dev->gadget);
+                        spin_lock(&dev->lock);
+                        DBG(dev, "suspend %s\n", dev->driver->driver.name);
+                }
+        }
+
+        /* enter PHY low power suspend */
+        devlc = readl(&dev->op_regs->devlc);
+        VDBG(dev, "devlc = 0x%08x\n", devlc);
+        devlc |= LPM_PHCD;
+        writel(devlc, &dev->op_regs->devlc);
+
+        DBG(dev, "<--- %s()\n", __func__);
+}
+
+
+static void handle_bus_resume(struct langwell_udc *dev)
+{
+        u32             devlc;
+        DBG(dev, "---> %s()\n", __func__);
+
+        dev->usb_state = dev->resume_state;
+        dev->resume_state = 0;
+
+        /* exit PHY low power suspend */
+        devlc = readl(&dev->op_regs->devlc);
+        VDBG(dev, "devlc = 0x%08x\n", devlc);
+        devlc &= ~LPM_PHCD;
+        writel(devlc, &dev->op_regs->devlc);
+
+#ifdef  OTG_TRANSCEIVER
+        if (dev->lotg->otg.default_a == 0)
+                dev->lotg->hsm.a_bus_suspend = 0;
+#endif
+
+        /* report resume to the driver */
+        if (dev->driver) {
+                if (dev->driver->resume) {
+                        spin_unlock(&dev->lock);
+                        dev->driver->resume(&dev->gadget);
+                        spin_lock(&dev->lock);
+                        DBG(dev, "resume %s\n", dev->driver->driver.name);
+                }
+        }
+
+        DBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB device controller interrupt handler */
+static irqreturn_t langwell_irq(int irq, void *_dev)
+{
+        struct langwell_udc     *dev = _dev;
+        u32                     usbsts,
+                                usbintr,
+                                irq_sts,
+                                portsc1;
+
+        VDBG(dev, "---> %s()\n", __func__);
+
+        if (dev->stopped) {
+                VDBG(dev, "handle IRQ_NONE\n");
+                VDBG(dev, "<--- %s()\n", __func__);
+                return IRQ_NONE;
+        }
+
+        spin_lock(&dev->lock);
+
+        /* USB status */
+        usbsts = readl(&dev->op_regs->usbsts);
+
+        /* USB interrupt enable */
+        usbintr = readl(&dev->op_regs->usbintr);
+
+        irq_sts = usbsts & usbintr;
+        VDBG(dev, "usbsts = 0x%08x, usbintr = 0x%08x, irq_sts = 0x%08x\n",
+                        usbsts, usbintr, irq_sts);
+
+        if (!irq_sts) {
+                VDBG(dev, "handle IRQ_NONE\n");
+                VDBG(dev, "<--- %s()\n", __func__);
+                spin_unlock(&dev->lock);
+                return IRQ_NONE;
+        }
+
+        /* Write-Clear interrupt status bits */
+        writel(irq_sts, &dev->op_regs->usbsts);
+
+        /* resume from suspend */
+        portsc1 = readl(&dev->op_regs->portsc1);
+        if (dev->usb_state == USB_STATE_SUSPENDED)
+                if (!(portsc1 & PORTS_SUSP))
+                        handle_bus_resume(dev);
+
+        /* USB interrupt */
+        if (irq_sts & STS_UI) {
+                VDBG(dev, "USB interrupt\n");
+
+                /* setup packet received from ep0 */
+                if (readl(&dev->op_regs->endptsetupstat)
+                                & EP0SETUPSTAT_MASK) {
+                        VDBG(dev, "USB SETUP packet received interrupt\n");
+                        /* setup tripwire semaphone */
+                        setup_tripwire(dev);
+                        handle_setup_packet(dev, &dev->local_setup_buff);
+                }
+
+                /* USB transfer completion */
+                if (readl(&dev->op_regs->endptcomplete)) {
+                        VDBG(dev, "USB transfer completion interrupt\n");
+                        handle_trans_complete(dev);
+                }
+        }
+
+        /* SOF received interrupt (for ISO transfer) */
+        if (irq_sts & STS_SRI) {
+                /* FIXME */
+                /* VDBG(dev, "SOF received interrupt\n"); */
+        }
+
+        /* port change detect interrupt */
+        if (irq_sts & STS_PCI) {
+                VDBG(dev, "port change detect interrupt\n");
+                handle_port_change(dev);
+        }
+
+        /* suspend interrrupt */
+        if (irq_sts & STS_SLI) {
+                VDBG(dev, "suspend interrupt\n");
+                handle_bus_suspend(dev);
+        }
+
+        /* USB reset interrupt */
+        if (irq_sts & STS_URI) {
+                VDBG(dev, "USB reset interrupt\n");
+                handle_usb_reset(dev);
+        }
+
+        /* USB error or system error interrupt */
+        if (irq_sts & (STS_UEI | STS_SEI)) {
+                /* FIXME */
+                WARNING(dev, "error IRQ, irq_sts: %x\n", irq_sts);
+        }
+
+        spin_unlock(&dev->lock);
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return IRQ_HANDLED;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* release device structure */
+static void gadget_release(struct device *_dev)
+{
+        struct langwell_udc     *dev = the_controller;
+
+        DBG(dev, "---> %s()\n", __func__);
+
+        complete(dev->done);
+
+        DBG(dev, "<--- %s()\n", __func__);
+        kfree(dev);
+}
+
+
+/* tear down the binding between this driver and the pci device */
+static void langwell_udc_remove(struct pci_dev *pdev)
+{
+        struct langwell_udc     *dev = the_controller;
+
+        DECLARE_COMPLETION(done);
+
+        BUG_ON(dev->driver);
+        DBG(dev, "---> %s()\n", __func__);
+
+        dev->done = &done;
+
+        /* free memory allocated in probe */
+        if (dev->dtd_pool)
+                dma_pool_destroy(dev->dtd_pool);
+
+        if (dev->status_req) {
+                kfree(dev->status_req->req.buf);
+                kfree(dev->status_req);
+        }
+
+        if (dev->ep_dqh)
+                dma_free_coherent(&pdev->dev, dev->ep_dqh_size,
+                        dev->ep_dqh, dev->ep_dqh_dma);
+
+        kfree(dev->ep);
+
+        /* diable IRQ handler */
+        if (dev->got_irq)
+                free_irq(pdev->irq, dev);
+
+#ifndef OTG_TRANSCEIVER
+        if (dev->cap_regs)
+                iounmap(dev->cap_regs);
+
+        if (dev->region)
+                release_mem_region(pci_resource_start(pdev, 0),
+                                pci_resource_len(pdev, 0));
+
+        if (dev->enabled)
+                pci_disable_device(pdev);
+#else
+        if (dev->transceiver) {
+                otg_put_transceiver(dev->transceiver);
+                dev->transceiver = NULL;
+                dev->lotg = NULL;
+        }
+#endif
+
+        dev->cap_regs = NULL;
+
+        INFO(dev, "unbind\n");
+        DBG(dev, "<--- %s()\n", __func__);
+
+        device_unregister(&dev->gadget.dev);
+        device_remove_file(&pdev->dev, &dev_attr_langwell_udc);
+
+#ifndef OTG_TRANSCEIVER
+        pci_set_drvdata(pdev, NULL);
+#endif
+
+        /* free dev, wait for the release() finished */
+        wait_for_completion(&done);
+
+        the_controller = NULL;
+}
+
+
+/*
+ * wrap this driver around the specified device, but
+ * don't respond over USB until a gadget driver binds to us.
+ */
+static int langwell_udc_probe(struct pci_dev *pdev,
+                const struct pci_device_id *id)
+{
+        struct langwell_udc     *dev;
+#ifndef OTG_TRANSCEIVER
+        unsigned long           resource, len;
+#endif
+        void                    __iomem *base = NULL;
+        size_t                  size;
+        int                     retval;
+
+        if (the_controller) {
+                dev_warn(&pdev->dev, "ignoring\n");
+                return -EBUSY;
+        }
+
+        /* alloc, and start init */
+        dev = kzalloc(sizeof *dev, GFP_KERNEL);
+        if (dev == NULL) {
+                retval = -ENOMEM;
+                goto error;
+        }
+
+        /* initialize device spinlock */
+        spin_lock_init(&dev->lock);
+
+        dev->pdev = pdev;
+        DBG(dev, "---> %s()\n", __func__);
+
+#ifdef  OTG_TRANSCEIVER
+        /* PCI device is already enabled by otg_transceiver driver */
+        dev->enabled = 1;
+
+        /* mem region and register base */
+        dev->region = 1;
+        dev->transceiver = otg_get_transceiver();
+        dev->lotg = otg_to_langwell(dev->transceiver);
+        base = dev->lotg->regs;
+#else
+        pci_set_drvdata(pdev, dev);
+
+        /* now all the pci goodies ... */
+        if (pci_enable_device(pdev) < 0) {
+                retval = -ENODEV;
+                goto error;
+        }
+        dev->enabled = 1;
+
+        /* control register: BAR 0 */
+        resource = pci_resource_start(pdev, 0);
+        len = pci_resource_len(pdev, 0);
+        if (!request_mem_region(resource, len, driver_name)) {
+                ERROR(dev, "controller already in use\n");
+                retval = -EBUSY;
+                goto error;
+        }
+        dev->region = 1;
+
+        base = ioremap_nocache(resource, len);
+#endif
+        if (base == NULL) {
+                ERROR(dev, "can't map memory\n");
+                retval = -EFAULT;
+                goto error;
+        }
+
+        dev->cap_regs = (struct langwell_cap_regs __iomem *) base;
+        VDBG(dev, "dev->cap_regs: %p\n", dev->cap_regs);
+        dev->op_regs = (struct langwell_op_regs __iomem *)
+                (base + OP_REG_OFFSET);
+        VDBG(dev, "dev->op_regs: %p\n", dev->op_regs);
+
+        /* irq setup after old hardware is cleaned up */
+        if (!pdev->irq) {
+                ERROR(dev, "No IRQ. Check PCI setup!\n");
+                retval = -ENODEV;
+                goto error;
+        }
+
+#ifndef OTG_TRANSCEIVER
+        INFO(dev, "irq %d, io mem: 0x%08lx, len: 0x%08lx, pci mem 0x%p\n",
+                        pdev->irq, resource, len, base);
+        /* enables bus-mastering for device dev */
+        pci_set_master(pdev);
+
+        if (request_irq(pdev->irq, langwell_irq, IRQF_SHARED,
+                                driver_name, dev) != 0) {
+                ERROR(dev, "request interrupt %d failed\n", pdev->irq);
+                retval = -EBUSY;
+                goto error;
+        }
+        dev->got_irq = 1;
+#endif
+
+        /* set stopped bit */
+        dev->stopped = 1;
+
+        /* capabilities and endpoint number */
+        dev->lpm = (readl(&dev->cap_regs->hccparams) & HCC_LEN) ? 1 : 0;
+        dev->dciversion = readw(&dev->cap_regs->dciversion);
+        dev->devcap = (readl(&dev->cap_regs->dccparams) & DEVCAP) ? 1 : 0;
+        VDBG(dev, "dev->lpm: %d\n", dev->lpm);
+        VDBG(dev, "dev->dciversion: 0x%04x\n", dev->dciversion);
+        VDBG(dev, "dccparams: 0x%08x\n", readl(&dev->cap_regs->dccparams));
+        VDBG(dev, "dev->devcap: %d\n", dev->devcap);
+        if (!dev->devcap) {
+                ERROR(dev, "can't support device mode\n");
+                retval = -ENODEV;
+                goto error;
+        }
+
+        /* a pair of endpoints (out/in) for each address */
+        dev->ep_max = DEN(readl(&dev->cap_regs->dccparams)) * 2;
+        VDBG(dev, "dev->ep_max: %d\n", dev->ep_max);
+
+        /* allocate endpoints memory */
+        dev->ep = kzalloc(sizeof(struct langwell_ep) * dev->ep_max,
+                        GFP_KERNEL);
+        if (!dev->ep) {
+                ERROR(dev, "allocate endpoints memory failed\n");
+                retval = -ENOMEM;
+                goto error;
+        }
+
+        /* allocate device dQH memory */
+        size = dev->ep_max * sizeof(struct langwell_dqh);
+        VDBG(dev, "orig size = %d\n", size);
+        if (size < DQH_ALIGNMENT)
+                size = DQH_ALIGNMENT;
+        else if ((size % DQH_ALIGNMENT) != 0) {
+                size += DQH_ALIGNMENT + 1;
+                size &= ~(DQH_ALIGNMENT - 1);
+        }
+        dev->ep_dqh = dma_alloc_coherent(&pdev->dev, size,
+                                        &dev->ep_dqh_dma, GFP_KERNEL);
+        if (!dev->ep_dqh) {
+                ERROR(dev, "allocate dQH memory failed\n");
+                retval = -ENOMEM;
+                goto error;
+        }
+        dev->ep_dqh_size = size;
+        VDBG(dev, "ep_dqh_size = %d\n", dev->ep_dqh_size);
+
+        /* initialize ep0 status request structure */
+        dev->status_req = kzalloc(sizeof(struct langwell_request), GFP_KERNEL);
+        if (!dev->status_req) {
+                ERROR(dev, "allocate status_req memory failed\n");
+                retval = -ENOMEM;
+                goto error;
+        }
+        INIT_LIST_HEAD(&dev->status_req->queue);
+
+        /* allocate a small amount of memory to get valid address */
+        dev->status_req->req.buf = kmalloc(8, GFP_KERNEL);
+        dev->status_req->req.dma = virt_to_phys(dev->status_req->req.buf);
+
+        dev->resume_state = USB_STATE_NOTATTACHED;
+        dev->usb_state = USB_STATE_POWERED;
+        dev->ep0_dir = USB_DIR_OUT;
+        dev->remote_wakeup = 0; /* default to 0 on reset */
+
+#ifndef OTG_TRANSCEIVER
+        /* reset device controller */
+        langwell_udc_reset(dev);
+#endif
+
+        /* initialize gadget structure */
+        dev->gadget.ops = &langwell_ops;        /* usb_gadget_ops */
+        dev->gadget.ep0 = &dev->ep[0].ep;       /* gadget ep0 */
+        INIT_LIST_HEAD(&dev->gadget.ep_list);   /* ep_list */
+        dev->gadget.speed = USB_SPEED_UNKNOWN;  /* speed */
+        dev->gadget.is_dualspeed = 1;           /* support dual speed */
+#ifdef  OTG_TRANSCEIVER
+        dev->gadget.is_otg = 1;                 /* support otg mode */
+#endif
+
+        /* the "gadget" abstracts/virtualizes the controller */
+        dev_set_name(&dev->gadget.dev, "gadget");
+        dev->gadget.dev.parent = &pdev->dev;
+        dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
+        dev->gadget.dev.release = gadget_release;
+        dev->gadget.name = driver_name;         /* gadget name */
+
+        /* controller endpoints reinit */
+        eps_reinit(dev);
+
+#ifndef OTG_TRANSCEIVER
+        /* reset ep0 dQH and endptctrl */
+        ep0_reset(dev);
+#endif
+
+        /* create dTD dma_pool resource */
+        dev->dtd_pool = dma_pool_create("langwell_dtd",
+                        &dev->pdev->dev,
+                        sizeof(struct langwell_dtd),
+                        DTD_ALIGNMENT,
+                        DMA_BOUNDARY);
+
+        if (!dev->dtd_pool) {
+                retval = -ENOMEM;
+                goto error;
+        }
+
+        /* done */
+        INFO(dev, "%s\n", driver_desc);
+        INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
+        INFO(dev, "Driver version: " DRIVER_VERSION "\n");
+        INFO(dev, "Support (max) %d endpoints\n", dev->ep_max);
+        INFO(dev, "Device interface version: 0x%04x\n", dev->dciversion);
+        INFO(dev, "Controller mode: %s\n", dev->devcap ? "Device" : "Host");
+        INFO(dev, "Support USB LPM: %s\n", dev->lpm ? "Yes" : "No");
+
+        VDBG(dev, "After langwell_udc_probe(), print all registers:\n");
+#ifdef  VERBOSE
+        print_all_registers(dev);
+#endif
+
+        the_controller = dev;
+
+        retval = device_register(&dev->gadget.dev);
+        if (retval)
+                goto error;
+
+        retval = device_create_file(&pdev->dev, &dev_attr_langwell_udc);
+        if (retval)
+                goto error;
+
+        VDBG(dev, "<--- %s()\n", __func__);
+        return 0;
+
+error:
+        if (dev) {
+                DBG(dev, "<--- %s()\n", __func__);
+                langwell_udc_remove(pdev);
+        }
+
+        return retval;
+}
+
+
+/* device controller suspend */
+static int langwell_udc_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        struct langwell_udc     *dev = the_controller;
+        u32                     devlc;
+
+        DBG(dev, "---> %s()\n", __func__);
+
+        /* disable interrupt and set controller to stop state */
+        langwell_udc_stop(dev);
+
+        /* diable IRQ handler */
+        if (dev->got_irq)
+                free_irq(pdev->irq, dev);
+        dev->got_irq = 0;
+
+
+        /* save PCI state */
+        pci_save_state(pdev);
+
+        /* set device power state */
+        pci_set_power_state(pdev, PCI_D3hot);
+
+        /* enter PHY low power suspend */
+        devlc = readl(&dev->op_regs->devlc);
+        VDBG(dev, "devlc = 0x%08x\n", devlc);
+        devlc |= LPM_PHCD;
+        writel(devlc, &dev->op_regs->devlc);
+
+        DBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* device controller resume */
+static int langwell_udc_resume(struct pci_dev *pdev)
+{
+        struct langwell_udc     *dev = the_controller;
+        u32                     devlc;
+
+        DBG(dev, "---> %s()\n", __func__);
+
+        /* exit PHY low power suspend */
+        devlc = readl(&dev->op_regs->devlc);
+        VDBG(dev, "devlc = 0x%08x\n", devlc);
+        devlc &= ~LPM_PHCD;
+        writel(devlc, &dev->op_regs->devlc);
+
+        /* set device D0 power state */
+        pci_set_power_state(pdev, PCI_D0);
+
+        /* restore PCI state */
+        pci_restore_state(pdev);
+
+        /* enable IRQ handler */
+        if (request_irq(pdev->irq, langwell_irq, IRQF_SHARED, driver_name, dev)
+                        != 0) {
+                ERROR(dev, "request interrupt %d failed\n", pdev->irq);
+                return -1;
+        }
+        dev->got_irq = 1;
+
+        /* reset and start controller to run state */
+        if (dev->stopped) {
+                /* reset device controller */
+                langwell_udc_reset(dev);
+
+                /* reset ep0 dQH and endptctrl */
+                ep0_reset(dev);
+
+                /* start device if gadget is loaded */
+                if (dev->driver)
+                        langwell_udc_start(dev);
+        }
+
+        /* reset USB status */
+        dev->usb_state = USB_STATE_ATTACHED;
+        dev->ep0_state = WAIT_FOR_SETUP;
+        dev->ep0_dir = USB_DIR_OUT;
+
+        DBG(dev, "<--- %s()\n", __func__);
+        return 0;
+}
+
+
+/* pci driver shutdown */
+static void langwell_udc_shutdown(struct pci_dev *pdev)
+{
+        struct langwell_udc     *dev = the_controller;
+        u32                     usbmode;
+
+        DBG(dev, "---> %s()\n", __func__);
+
+        /* reset controller mode to IDLE */
+        usbmode = readl(&dev->op_regs->usbmode);
+        DBG(dev, "usbmode = 0x%08x\n", usbmode);
+        usbmode &= (~3 | MODE_IDLE);
+        writel(usbmode, &dev->op_regs->usbmode);
+
+        DBG(dev, "<--- %s()\n", __func__);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct pci_device_id pci_ids[] = { {
+        .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
+        .class_mask =   ~0,
+        .vendor =       0x8086,
+        .device =       0x0811,
+        .subvendor =    PCI_ANY_ID,
+        .subdevice =    PCI_ANY_ID,
+}, { /* end: all zeroes */ }
+};
+
+
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+
+static struct pci_driver langwell_pci_driver = {
+        .name =         (char *) driver_name,
+        .id_table =     pci_ids,
+
+        .probe =        langwell_udc_probe,
+        .remove =       langwell_udc_remove,
+
+        /* device controller suspend/resume */
+        .suspend =      langwell_udc_suspend,
+        .resume =       langwell_udc_resume,
+
+        .shutdown =     langwell_udc_shutdown,
+};
+
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Xiaochen Shen <xiaochen.shen@intel.com>");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
+
+
+static int __init init(void)
+{
+#ifdef  OTG_TRANSCEIVER
+        return langwell_register_peripheral(&langwell_pci_driver);
+#else
+        return pci_register_driver(&langwell_pci_driver);
+#endif
+}
+module_init(init);
+
+
+static void __exit cleanup(void)
+{
+#ifdef  OTG_TRANSCEIVER
+        return langwell_unregister_peripheral(&langwell_pci_driver);
+#else
+        pci_unregister_driver(&langwell_pci_driver);
+#endif
+}
+module_exit(cleanup);
+
diff --git a/drivers/usb/gadget/langwell_udc.h b/drivers/usb/gadget/langwell_udc.h
new file mode 100644
index 000000000000..9719934e1c08
--- /dev/null
+++ b/drivers/usb/gadget/langwell_udc.h
@@ -0,0 +1,228 @@
+/*
+ * Intel Langwell USB Device Controller driver
+ * Copyright (C) 2008-2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/usb/langwell_udc.h>
+
+#if defined(CONFIG_USB_LANGWELL_OTG)
+#include <linux/usb/langwell_otg.h>
+#endif
+
+
+/*-------------------------------------------------------------------------*/
+
+/* driver data structures and utilities */
+
+/*
+ * dTD: Device Endpoint Transfer Descriptor
+ * describe to the device controller the location and quantity of
+ * data to be send/received for given transfer
+ */
+struct langwell_dtd {
+        u32     dtd_next;
+/* bits 31:5, next transfer element pointer */
+#define DTD_NEXT(d)     (((d)>>5)&0x7ffffff)
+#define DTD_NEXT_MASK   (0x7ffffff << 5)
+/* terminate */
+#define DTD_TERM        BIT(0)
+        /* bits 7:0, execution back states */
+        u32     dtd_status:8;
+#define DTD_STATUS(d)   (((d)>>0)&0xff)
+#define DTD_STS_ACTIVE  BIT(7)  /* active */
+#define DTD_STS_HALTED  BIT(6)  /* halted */
+#define DTD_STS_DBE     BIT(5)  /* data buffer error */
+#define DTD_STS_TRE     BIT(3)  /* transaction error  */
+        /* bits 9:8 */
+        u32     dtd_res0:2;
+        /* bits 11:10, multipier override */
+        u32     dtd_multo:2;
+#define DTD_MULTO       (BIT(11) | BIT(10))
+        /* bits 14:12 */
+        u32     dtd_res1:3;
+        /* bit 15, interrupt on complete */
+        u32     dtd_ioc:1;
+#define DTD_IOC         BIT(15)
+        /* bits 30:16, total bytes */
+        u32     dtd_total:15;
+#define DTD_TOTAL(d)    (((d)>>16)&0x7fff)
+#define DTD_MAX_TRANSFER_LENGTH 0x4000
+        /* bit 31 */
+        u32     dtd_res2:1;
+        /* dTD buffer pointer page 0 to 4 */
+        u32     dtd_buf[5];
+#define DTD_OFFSET_MASK 0xfff
+/* bits 31:12, buffer pointer */
+#define DTD_BUFFER(d)   (((d)>>12)&0x3ff)
+/* bits 11:0, current offset */
+#define DTD_C_OFFSET(d) (((d)>>0)&0xfff)
+/* bits 10:0, frame number */
+#define DTD_FRAME(d)    (((d)>>0)&0x7ff)
+
+        /* driver-private parts */
+
+        /* dtd dma address */
+        dma_addr_t              dtd_dma;
+        /* next dtd virtual address */
+        struct langwell_dtd     *next_dtd_virt;
+};
+
+
+/*
+ * dQH: Device Endpoint Queue Head
+ * describe where all transfers are managed
+ * 48-byte data structure, aligned on 64-byte boundary
+ *
+ * These are associated with dTD structure
+ */
+struct langwell_dqh {
+        /* endpoint capabilities and characteristics */
+        u32     dqh_res0:15;    /* bits 14:0 */
+        u32     dqh_ios:1;      /* bit 15, interrupt on setup */
+#define DQH_IOS         BIT(15)
+        u32     dqh_mpl:11;     /* bits 26:16, maximum packet length */
+#define DQH_MPL         (0x7ff << 16)
+        u32     dqh_res1:2;     /* bits 28:27 */
+        u32     dqh_zlt:1;      /* bit 29, zero length termination */
+#define DQH_ZLT         BIT(29)
+        u32     dqh_mult:2;     /* bits 31:30 */
+#define DQH_MULT        (BIT(30) | BIT(31))
+
+        /* current dTD pointer */
+        u32     dqh_current;    /* locate the transfer in progress */
+#define DQH_C_DTD(e)    \
+        (((e)>>5)&0x7ffffff)    /* bits 31:5, current dTD pointer */
+
+        /* transfer overlay, hardware parts of a struct langwell_dtd */
+        u32     dtd_next;
+        u32     dtd_status:8;   /* bits 7:0, execution back states */
+        u32     dtd_res0:2;     /* bits 9:8 */
+        u32     dtd_multo:2;    /* bits 11:10, multipier override */
+        u32     dtd_res1:3;     /* bits 14:12 */
+        u32     dtd_ioc:1;      /* bit 15, interrupt on complete */
+        u32     dtd_total:15;   /* bits 30:16, total bytes */
+        u32     dtd_res2:1;     /* bit 31 */
+        u32     dtd_buf[5];     /* dTD buffer pointer page 0 to 4 */
+
+        u32     dqh_res2;
+        struct usb_ctrlrequest  dqh_setup;      /* setup packet buffer */
+} __attribute__ ((aligned(64)));
+
+
+/* endpoint data structure */
+struct langwell_ep {
+        struct usb_ep           ep;
+        dma_addr_t              dma;
+        struct langwell_udc     *dev;
+        unsigned long           irqs;
+        struct list_head        queue;
+        struct langwell_dqh     *dqh;
+        const struct usb_endpoint_descriptor    *desc;
+        char                    name[14];
+        unsigned                stopped:1,
+                                ep_type:2,
+                                ep_num:8;
+};
+
+
+/* request data structure */
+struct langwell_request {
+        struct usb_request      req;
+        struct langwell_dtd     *dtd, *head, *tail;
+        struct langwell_ep      *ep;
+        dma_addr_t              dtd_dma;
+        struct list_head        queue;
+        unsigned                dtd_count;
+        unsigned                mapped:1;
+};
+
+
+/* ep0 transfer state */
+enum ep0_state {
+        WAIT_FOR_SETUP,
+        DATA_STATE_XMIT,
+        DATA_STATE_NEED_ZLP,
+        WAIT_FOR_OUT_STATUS,
+        DATA_STATE_RECV,
+};
+
+
+/* device suspend state */
+enum lpm_state {
+        LPM_L0, /* on */
+        LPM_L1, /* LPM L1 sleep */
+        LPM_L2, /* suspend */
+        LPM_L3, /* off */
+};
+
+
+/* device data structure */
+struct langwell_udc {
+        /* each pci device provides one gadget, several endpoints */
+        struct usb_gadget       gadget;
+        spinlock_t              lock;   /* device lock */
+        struct langwell_ep      *ep;
+        struct usb_gadget_driver        *driver;
+        struct otg_transceiver  *transceiver;
+        u8                      dev_addr;
+        u32                     usb_state;
+        u32                     resume_state;
+        u32                     bus_reset;
+        enum lpm_state          lpm_state;
+        enum ep0_state          ep0_state;
+        u32                     ep0_dir;
+        u16                     dciversion;
+        unsigned                ep_max;
+        unsigned                devcap:1,
+                                enabled:1,
+                                region:1,
+                                got_irq:1,
+                                powered:1,
+                                remote_wakeup:1,
+                                rate:1,
+                                is_reset:1,
+                                softconnected:1,
+                                vbus_active:1,
+                                suspended:1,
+                                stopped:1,
+                                lpm:1;  /* LPM capability */
+
+        /* pci state used to access those endpoints */
+        struct pci_dev          *pdev;
+
+        /* Langwell otg transceiver */
+        struct langwell_otg     *lotg;
+
+        /* control registers */
+        struct langwell_cap_regs        __iomem *cap_regs;
+        struct langwell_op_regs         __iomem *op_regs;
+
+        struct usb_ctrlrequest  local_setup_buff;
+        struct langwell_dqh     *ep_dqh;
+        size_t                  ep_dqh_size;
+        dma_addr_t              ep_dqh_dma;
+
+        /* ep0 status request */
+        struct langwell_request *status_req;
+
+        /* dma pool */
+        struct dma_pool         *dtd_pool;
+
+        /* make sure release() is done */
+        struct completion       *done;
+};
+
diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index 8cc676ecbb23..1937d8c7b433 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -38,7 +38,6 @@
 #include <linux/usb.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
-#include <mach/pxa2xx-regs.h> /* FIXME: for PSSR */
 #include <mach/udc.h>
 
 #include "pxa27x_udc.h"
@@ -474,6 +473,23 @@ static inline void udc_clear_mask_UDCCR(struct pxa_udc *udc, int mask)
 }
 
 /**
+ * ep_write_UDCCSR - set bits in UDCCSR
+ * @udc: udc device
+ * @mask: bits to set in UDCCR
+ *
+ * Sets bits in UDCCSR (UDCCSR0 and UDCCSR*).
+ *
+ * A specific case is applied to ep0 : the ACM bit is always set to 1, for
+ * SET_INTERFACE and SET_CONFIGURATION.
+ */
+static inline void ep_write_UDCCSR(struct pxa_ep *ep, int mask)
+{
+        if (is_ep0(ep))
+                mask |= UDCCSR0_ACM;
+        udc_ep_writel(ep, UDCCSR, mask);
+}
+
+/**
  * ep_count_bytes_remain - get how many bytes in udc endpoint
  * @ep: udc endpoint
  *
@@ -861,7 +877,7 @@ static int read_packet(struct pxa_ep *ep, struct pxa27x_request *req)
                 *buf++ = udc_ep_readl(ep, UDCDR);
         req->req.actual += count;
 
-        udc_ep_writel(ep, UDCCSR, UDCCSR_PC);
+        ep_write_UDCCSR(ep, UDCCSR_PC);
 
         return count;
 }
@@ -969,12 +985,12 @@ static int write_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
                 if (udccsr & UDCCSR_PC) {
                         ep_vdbg(ep, "Clearing Transmit Complete, udccsr=%x\n",
                                 udccsr);
-                        udc_ep_writel(ep, UDCCSR, UDCCSR_PC);
+                        ep_write_UDCCSR(ep, UDCCSR_PC);
                 }
                 if (udccsr & UDCCSR_TRN) {
                         ep_vdbg(ep, "Clearing Underrun on, udccsr=%x\n",
                                 udccsr);
-                        udc_ep_writel(ep, UDCCSR, UDCCSR_TRN);
+                        ep_write_UDCCSR(ep, UDCCSR_TRN);
                 }
 
                 count = write_packet(ep, req, max);
@@ -996,7 +1012,7 @@ static int write_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
                 }
 
                 if (is_short)
-                        udc_ep_writel(ep, UDCCSR, UDCCSR_SP);
+                        ep_write_UDCCSR(ep, UDCCSR_SP);
 
                 /* requests complete when all IN data is in the FIFO */
                 if (is_last) {
@@ -1029,7 +1045,7 @@ static int read_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
 
         while (epout_has_pkt(ep)) {
                 count = read_packet(ep, req);
-                udc_ep_writel(ep, UDCCSR, UDCCSR0_OPC);
+                ep_write_UDCCSR(ep, UDCCSR0_OPC);
                 inc_ep_stats_bytes(ep, count, !USB_DIR_IN);
 
                 is_short = (count < ep->fifo_size);
@@ -1074,7 +1090,7 @@ static int write_ep0_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
 
         /* Sends either a short packet or a 0 length packet */
         if (unlikely(is_short))
-                udc_ep_writel(ep, UDCCSR, UDCCSR0_IPR);
+                ep_write_UDCCSR(ep, UDCCSR0_IPR);
 
         ep_dbg(ep, "in %d bytes%s%s, %d left, req=%p, udccsr0=0x%03x\n",
                 count, is_short ? "/S" : "", is_last ? "/L" : "",
@@ -1277,7 +1293,7 @@ static int pxa_ep_set_halt(struct usb_ep *_ep, int value)
 
         /* FST, FEF bits are the same for control and non control endpoints */
         rc = 0;
-        udc_ep_writel(ep, UDCCSR, UDCCSR_FST | UDCCSR_FEF);
+        ep_write_UDCCSR(ep, UDCCSR_FST | UDCCSR_FEF);
         if (is_ep0(ep))
                 set_ep0state(ep->dev, STALL);
 
@@ -1343,7 +1359,7 @@ static void pxa_ep_fifo_flush(struct usb_ep *_ep)
                         udc_ep_readl(ep, UDCDR);
         } else {
                 /* most IN status is the same, but ISO can't stall */
-                udc_ep_writel(ep, UDCCSR,
+                ep_write_UDCCSR(ep,
                                 UDCCSR_PC | UDCCSR_FEF | UDCCSR_TRN
                                 | (EPXFERTYPE_is_ISO(ep) ? 0 : UDCCSR_SST));
         }
@@ -1728,6 +1744,7 @@ static void udc_enable(struct pxa_udc *udc)
         memset(&udc->stats, 0, sizeof(udc->stats));
 
         udc_set_mask_UDCCR(udc, UDCCR_UDE);
+        ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_ACM);
         udelay(2);
         if (udc_readl(udc, UDCCR) & UDCCR_EMCE)
                 dev_err(udc->dev, "Configuration errors, udc disabled\n");
@@ -1893,6 +1910,15 @@ static void handle_ep0_ctrl_req(struct pxa_udc *udc,
 
         nuke(ep, -EPROTO);
 
+        /*
+         * In the PXA320 manual, in the section about Back-to-Back setup
+         * packets, it describes this situation.  The solution is to set OPC to
+         * get rid of the status packet, and then continue with the setup
+         * packet. Generalize to pxa27x CPUs.
+         */
+        if (epout_has_pkt(ep) && (ep_count_bytes_remain(ep) == 0))
+                ep_write_UDCCSR(ep, UDCCSR0_OPC);
+
         /* read SETUP packet */
         for (i = 0; i < 2; i++) {
                 if (unlikely(ep_is_empty(ep)))
@@ -1919,7 +1945,7 @@ static void handle_ep0_ctrl_req(struct pxa_udc *udc,
                 set_ep0state(udc, OUT_DATA_STAGE);
 
         /* Tell UDC to enter Data Stage */
-        udc_ep_writel(ep, UDCCSR, UDCCSR0_SA | UDCCSR0_OPC);
+        ep_write_UDCCSR(ep, UDCCSR0_SA | UDCCSR0_OPC);
 
         i = udc->driver->setup(&udc->gadget, &u.r);
         if (i < 0)
@@ -1929,7 +1955,7 @@ out:
 stall:
         ep_dbg(ep, "protocol STALL, udccsr0=%03x err %d\n",
                 udc_ep_readl(ep, UDCCSR), i);
-        udc_ep_writel(ep, UDCCSR, UDCCSR0_FST | UDCCSR0_FTF);
+        ep_write_UDCCSR(ep, UDCCSR0_FST | UDCCSR0_FTF);
         set_ep0state(udc, STALL);
         goto out;
 }
@@ -1966,6 +1992,8 @@ stall:
  *     cleared by software.
  *   - clearing UDCCSR0_OPC always flushes ep0. If in setup stage, never do it
  *     before reading ep0.
+ *     This is true only for PXA27x. This is not true anymore for PXA3xx family
+ *     (check Back-to-Back setup packet in developers guide).
  *   - irq can be called on a "packet complete" event (opc_irq=1), while
  *     UDCCSR0_OPC is not yet raised (delta can be as big as 100ms
  *     from experimentation).
@@ -1998,7 +2026,7 @@ static void handle_ep0(struct pxa_udc *udc, int fifo_irq, int opc_irq)
         if (udccsr0 & UDCCSR0_SST) {
                 ep_dbg(ep, "clearing stall status\n");
                 nuke(ep, -EPIPE);
-                udc_ep_writel(ep, UDCCSR, UDCCSR0_SST);
+                ep_write_UDCCSR(ep, UDCCSR0_SST);
                 ep0_idle(udc);
         }
 
@@ -2023,7 +2051,7 @@ static void handle_ep0(struct pxa_udc *udc, int fifo_irq, int opc_irq)
                 break;
         case IN_DATA_STAGE:                     /* GET_DESCRIPTOR */
                 if (epout_has_pkt(ep))
-                        udc_ep_writel(ep, UDCCSR, UDCCSR0_OPC);
+                        ep_write_UDCCSR(ep, UDCCSR0_OPC);
                 if (req && !ep_is_full(ep))
                         completed = write_ep0_fifo(ep, req);
                 if (completed)
@@ -2036,7 +2064,7 @@ static void handle_ep0(struct pxa_udc *udc, int fifo_irq, int opc_irq)
                         ep0_end_out_req(ep, req);
                 break;
         case STALL:
-                udc_ep_writel(ep, UDCCSR, UDCCSR0_FST);
+                ep_write_UDCCSR(ep, UDCCSR0_FST);
                 break;
         case IN_STATUS_STAGE:
                 /*
@@ -2131,6 +2159,7 @@ static void pxa27x_change_configuration(struct pxa_udc *udc, int config)
 
         set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
         udc->driver->setup(&udc->gadget, &req);
+        ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
 }
 
 /**
@@ -2159,6 +2188,7 @@ static void pxa27x_change_interface(struct pxa_udc *udc, int iface, int alt)
 
         set_ep0state(udc, WAIT_ACK_SET_CONF_INTERF);
         udc->driver->setup(&udc->gadget, &req);
+        ep_write_UDCCSR(&udc->pxa_ep[0], UDCCSR0_AREN);
 }
 
 /*
@@ -2280,7 +2310,7 @@ static void irq_udc_reset(struct pxa_udc *udc)
         memset(&udc->stats, 0, sizeof udc->stats);
 
         nuke(ep, -EPROTO);
-        udc_ep_writel(ep, UDCCSR, UDCCSR0_FTF | UDCCSR0_OPC);
+        ep_write_UDCCSR(ep, UDCCSR0_FTF | UDCCSR0_OPC);
         ep0_idle(udc);
 }
 
@@ -2479,6 +2509,12 @@ static void pxa_udc_shutdown(struct platform_device *_dev)
                 udc_disable(udc);
 }
 
+#ifdef CONFIG_CPU_PXA27x
+extern void pxa27x_clear_otgph(void);
+#else
+#define pxa27x_clear_otgph()   do {} while (0)
+#endif
+
 #ifdef CONFIG_PM
 /**
  * pxa_udc_suspend - Suspend udc device
@@ -2546,8 +2582,7 @@ static int pxa_udc_resume(struct platform_device *_dev)
          * Software must configure the USB OTG pad, UDC, and UHC
          * to the state they were in before entering sleep mode.
          */
-        if (cpu_is_pxa27x())
-                PSSR |= PSSR_OTGPH;
+        pxa27x_clear_otgph();
 
         return 0;
 }
@@ -2571,7 +2606,7 @@ static struct platform_driver udc_driver = {
 
 static int __init udc_init(void)
 {
-        if (!cpu_is_pxa27x())
+        if (!cpu_is_pxa27x() && !cpu_is_pxa3xx())
                 return -ENODEV;
 
         printk(KERN_INFO "%s: version %s\n", driver_name, DRIVER_VERSION);
diff --git a/drivers/usb/gadget/pxa27x_udc.h b/drivers/usb/gadget/pxa27x_udc.h
index db58125331da..e25225e26586 100644
--- a/drivers/usb/gadget/pxa27x_udc.h
+++ b/drivers/usb/gadget/pxa27x_udc.h
@@ -130,6 +130,8 @@
 #define UP2OCR_HXOE     (1 << 17)       /* Transceiver Output Enable */
 #define UP2OCR_SEOS     (1 << 24)       /* Single-Ended Output Select */
 
+#define UDCCSR0_ACM     (1 << 9)        /* Ack Control Mode */
+#define UDCCSR0_AREN    (1 << 8)        /* Ack Response Enable */
 #define UDCCSR0_SA      (1 << 7)        /* Setup Active */
 #define UDCCSR0_RNE     (1 << 6)        /* Receive FIFO Not Empty */
 #define UDCCSR0_FST     (1 << 5)        /* Force Stall */
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
new file mode 100644
index 000000000000..50c71aae2cc2
--- /dev/null
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -0,0 +1,3269 @@
+/* linux/drivers/usb/gadget/s3c-hsotg.c
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * S3C USB2.0 High-speed / OtG driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+#include <mach/map.h>
+
+#include <plat/regs-usb-hsotg-phy.h>
+#include <plat/regs-usb-hsotg.h>
+#include <plat/regs-sys.h>
+#include <plat/udc-hs.h>
+
+#define DMA_ADDR_INVALID (~((dma_addr_t)0))
+
+/* EP0_MPS_LIMIT
+ *
+ * Unfortunately there seems to be a limit of the amount of data that can
+ * be transfered by IN transactions on EP0. This is either 127 bytes or 3
+ * packets (which practially means 1 packet and 63 bytes of data) when the
+ * MPS is set to 64.
+ *
+ * This means if we are wanting to move >127 bytes of data, we need to
+ * split the transactions up, but just doing one packet at a time does
+ * not work (this may be an implicit DATA0 PID on first packet of the
+ * transaction) and doing 2 packets is outside the controller's limits.
+ *
+ * If we try to lower the MPS size for EP0, then no transfers work properly
+ * for EP0, and the system will fail basic enumeration. As no cause for this
+ * has currently been found, we cannot support any large IN transfers for
+ * EP0.
+ */
+#define EP0_MPS_LIMIT   64
+
+struct s3c_hsotg;
+struct s3c_hsotg_req;
+
+/**
+ * struct s3c_hsotg_ep - driver endpoint definition.
+ * @ep: The gadget layer representation of the endpoint.
+ * @name: The driver generated name for the endpoint.
+ * @queue: Queue of requests for this endpoint.
+ * @parent: Reference back to the parent device structure.
+ * @req: The current request that the endpoint is processing. This is
+ *       used to indicate an request has been loaded onto the endpoint
+ *       and has yet to be completed (maybe due to data move, or simply
+ *       awaiting an ack from the core all the data has been completed).
+ * @debugfs: File entry for debugfs file for this endpoint.
+ * @lock: State lock to protect contents of endpoint.
+ * @dir_in: Set to true if this endpoint is of the IN direction, which
+ *          means that it is sending data to the Host.
+ * @index: The index for the endpoint registers.
+ * @name: The name array passed to the USB core.
+ * @halted: Set if the endpoint has been halted.
+ * @periodic: Set if this is a periodic ep, such as Interrupt
+ * @sent_zlp: Set if we've sent a zero-length packet.
+ * @total_data: The total number of data bytes done.
+ * @fifo_size: The size of the FIFO (for periodic IN endpoints)
+ * @fifo_load: The amount of data loaded into the FIFO (periodic IN)
+ * @last_load: The offset of data for the last start of request.
+ * @size_loaded: The last loaded size for DxEPTSIZE for periodic IN
+ *
+ * This is the driver's state for each registered enpoint, allowing it
+ * to keep track of transactions that need doing. Each endpoint has a
+ * lock to protect the state, to try and avoid using an overall lock
+ * for the host controller as much as possible.
+ *
+ * For periodic IN endpoints, we have fifo_size and fifo_load to try
+ * and keep track of the amount of data in the periodic FIFO for each
+ * of these as we don't have a status register that tells us how much
+ * is in each of them.
+ */
+struct s3c_hsotg_ep {
+        struct usb_ep           ep;
+        struct list_head        queue;
+        struct s3c_hsotg        *parent;
+        struct s3c_hsotg_req    *req;
+        struct dentry           *debugfs;
+
+        spinlock_t              lock;
+
+        unsigned long           total_data;
+        unsigned int            size_loaded;
+        unsigned int            last_load;
+        unsigned int            fifo_load;
+        unsigned short          fifo_size;
+
+        unsigned char           dir_in;
+        unsigned char           index;
+
+        unsigned int            halted:1;
+        unsigned int            periodic:1;
+        unsigned int            sent_zlp:1;
+
+        char                    name[10];
+};
+
+#define S3C_HSOTG_EPS   (8+1)   /* limit to 9 for the moment */
+
+/**
+ * struct s3c_hsotg - driver state.
+ * @dev: The parent device supplied to the probe function
+ * @driver: USB gadget driver
+ * @plat: The platform specific configuration data.
+ * @regs: The memory area mapped for accessing registers.
+ * @regs_res: The resource that was allocated when claiming register space.
+ * @irq: The IRQ number we are using
+ * @debug_root: root directrory for debugfs.
+ * @debug_file: main status file for debugfs.
+ * @debug_fifo: FIFO status file for debugfs.
+ * @ep0_reply: Request used for ep0 reply.
+ * @ep0_buff: Buffer for EP0 reply data, if needed.
+ * @ctrl_buff: Buffer for EP0 control requests.
+ * @ctrl_req: Request for EP0 control packets.
+ * @eps: The endpoints being supplied to the gadget framework
+ */
+struct s3c_hsotg {
+        struct device            *dev;
+        struct usb_gadget_driver *driver;
+        struct s3c_hsotg_plat    *plat;
+
+        void __iomem            *regs;
+        struct resource         *regs_res;
+        int                     irq;
+
+        struct dentry           *debug_root;
+        struct dentry           *debug_file;
+        struct dentry           *debug_fifo;
+
+        struct usb_request      *ep0_reply;
+        struct usb_request      *ctrl_req;
+        u8                      ep0_buff[8];
+        u8                      ctrl_buff[8];
+
+        struct usb_gadget       gadget;
+        struct s3c_hsotg_ep     eps[];
+};
+
+/**
+ * struct s3c_hsotg_req - data transfer request
+ * @req: The USB gadget request
+ * @queue: The list of requests for the endpoint this is queued for.
+ * @in_progress: Has already had size/packets written to core
+ * @mapped: DMA buffer for this request has been mapped via dma_map_single().
+ */
+struct s3c_hsotg_req {
+        struct usb_request      req;
+        struct list_head        queue;
+        unsigned char           in_progress;
+        unsigned char           mapped;
+};
+
+/* conversion functions */
+static inline struct s3c_hsotg_req *our_req(struct usb_request *req)
+{
+        return container_of(req, struct s3c_hsotg_req, req);
+}
+
+static inline struct s3c_hsotg_ep *our_ep(struct usb_ep *ep)
+{
+        return container_of(ep, struct s3c_hsotg_ep, ep);
+}
+
+static inline struct s3c_hsotg *to_hsotg(struct usb_gadget *gadget)
+{
+        return container_of(gadget, struct s3c_hsotg, gadget);
+}
+
+static inline void __orr32(void __iomem *ptr, u32 val)
+{
+        writel(readl(ptr) | val, ptr);
+}
+
+static inline void __bic32(void __iomem *ptr, u32 val)
+{
+        writel(readl(ptr) & ~val, ptr);
+}
+
+/* forward decleration of functions */
+static void s3c_hsotg_dump(struct s3c_hsotg *hsotg);
+
+/**
+ * using_dma - return the DMA status of the driver.
+ * @hsotg: The driver state.
+ *
+ * Return true if we're using DMA.
+ *
+ * Currently, we have the DMA support code worked into everywhere
+ * that needs it, but the AMBA DMA implementation in the hardware can
+ * only DMA from 32bit aligned addresses. This means that gadgets such
+ * as the CDC Ethernet cannot work as they often pass packets which are
+ * not 32bit aligned.
+ *
+ * Unfortunately the choice to use DMA or not is global to the controller
+ * and seems to be only settable when the controller is being put through
+ * a core reset. This means we either need to fix the gadgets to take
+ * account of DMA alignment, or add bounce buffers (yuerk).
+ *
+ * Until this issue is sorted out, we always return 'false'.
+ */
+static inline bool using_dma(struct s3c_hsotg *hsotg)
+{
+        return false;   /* support is not complete */
+}
+
+/**
+ * s3c_hsotg_en_gsint - enable one or more of the general interrupt
+ * @hsotg: The device state
+ * @ints: A bitmask of the interrupts to enable
+ */
+static void s3c_hsotg_en_gsint(struct s3c_hsotg *hsotg, u32 ints)
+{
+        u32 gsintmsk = readl(hsotg->regs + S3C_GINTMSK);
+        u32 new_gsintmsk;
+
+        new_gsintmsk = gsintmsk | ints;
+
+        if (new_gsintmsk != gsintmsk) {
+                dev_dbg(hsotg->dev, "gsintmsk now 0x%08x\n", new_gsintmsk);
+                writel(new_gsintmsk, hsotg->regs + S3C_GINTMSK);
+        }
+}
+
+/**
+ * s3c_hsotg_disable_gsint - disable one or more of the general interrupt
+ * @hsotg: The device state
+ * @ints: A bitmask of the interrupts to enable
+ */
+static void s3c_hsotg_disable_gsint(struct s3c_hsotg *hsotg, u32 ints)
+{
+        u32 gsintmsk = readl(hsotg->regs + S3C_GINTMSK);
+        u32 new_gsintmsk;
+
+        new_gsintmsk = gsintmsk & ~ints;
+
+        if (new_gsintmsk != gsintmsk)
+                writel(new_gsintmsk, hsotg->regs + S3C_GINTMSK);
+}
+
+/**
+ * s3c_hsotg_ctrl_epint - enable/disable an endpoint irq
+ * @hsotg: The device state
+ * @ep: The endpoint index
+ * @dir_in: True if direction is in.
+ * @en: The enable value, true to enable
+ *
+ * Set or clear the mask for an individual endpoint's interrupt
+ * request.
+ */
+static void s3c_hsotg_ctrl_epint(struct s3c_hsotg *hsotg,
+                                 unsigned int ep, unsigned int dir_in,
+                                 unsigned int en)
+{
+        unsigned long flags;
+        u32 bit = 1 << ep;
+        u32 daint;
+
+        if (!dir_in)
+                bit <<= 16;
+
+        local_irq_save(flags);
+        daint = readl(hsotg->regs + S3C_DAINTMSK);
+        if (en)
+                daint |= bit;
+        else
+                daint &= ~bit;
+        writel(daint, hsotg->regs + S3C_DAINTMSK);
+        local_irq_restore(flags);
+}
+
+/**
+ * s3c_hsotg_init_fifo - initialise non-periodic FIFOs
+ * @hsotg: The device instance.
+ */
+static void s3c_hsotg_init_fifo(struct s3c_hsotg *hsotg)
+{
+        /* the ryu 2.6.24 release ahs
+           writel(0x1C0, hsotg->regs + S3C_GRXFSIZ);
+           writel(S3C_GNPTXFSIZ_NPTxFStAddr(0x200) |
+                S3C_GNPTXFSIZ_NPTxFDep(0x1C0),
+                hsotg->regs + S3C_GNPTXFSIZ);
+        */
+
+        /* set FIFO sizes to 2048/0x1C0 */
+
+        writel(2048, hsotg->regs + S3C_GRXFSIZ);
+        writel(S3C_GNPTXFSIZ_NPTxFStAddr(2048) |
+               S3C_GNPTXFSIZ_NPTxFDep(0x1C0),
+               hsotg->regs + S3C_GNPTXFSIZ);
+}
+
+/**
+ * @ep: USB endpoint to allocate request for.
+ * @flags: Allocation flags
+ *
+ * Allocate a new USB request structure appropriate for the specified endpoint
+ */
+struct usb_request *s3c_hsotg_ep_alloc_request(struct usb_ep *ep, gfp_t flags)
+{
+        struct s3c_hsotg_req *req;
+
+        req = kzalloc(sizeof(struct s3c_hsotg_req), flags);
+        if (!req)
+                return NULL;
+
+        INIT_LIST_HEAD(&req->queue);
+
+        req->req.dma = DMA_ADDR_INVALID;
+        return &req->req;
+}
+
+/**
+ * is_ep_periodic - return true if the endpoint is in periodic mode.
+ * @hs_ep: The endpoint to query.
+ *
+ * Returns true if the endpoint is in periodic mode, meaning it is being
+ * used for an Interrupt or ISO transfer.
+ */
+static inline int is_ep_periodic(struct s3c_hsotg_ep *hs_ep)
+{
+        return hs_ep->periodic;
+}
+
+/**
+ * s3c_hsotg_unmap_dma - unmap the DMA memory being used for the request
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint for the request
+ * @hs_req: The request being processed.
+ *
+ * This is the reverse of s3c_hsotg_map_dma(), called for the completion
+ * of a request to ensure the buffer is ready for access by the caller.
+*/
+static void s3c_hsotg_unmap_dma(struct s3c_hsotg *hsotg,
+                                struct s3c_hsotg_ep *hs_ep,
+                                struct s3c_hsotg_req *hs_req)
+{
+        struct usb_request *req = &hs_req->req;
+        enum dma_data_direction dir;
+
+        dir = hs_ep->dir_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+        /* ignore this if we're not moving any data */
+        if (hs_req->req.length == 0)
+                return;
+
+        if (hs_req->mapped) {
+                /* we mapped this, so unmap and remove the dma */
+
+                dma_unmap_single(hsotg->dev, req->dma, req->length, dir);
+
+                req->dma = DMA_ADDR_INVALID;
+                hs_req->mapped = 0;
+        } else {
+                dma_sync_single(hsotg->dev, req->dma, req->length, dir);
+        }
+}
+
+/**
+ * s3c_hsotg_write_fifo - write packet Data to the TxFIFO
+ * @hsotg: The controller state.
+ * @hs_ep: The endpoint we're going to write for.
+ * @hs_req: The request to write data for.
+ *
+ * This is called when the TxFIFO has some space in it to hold a new
+ * transmission and we have something to give it. The actual setup of
+ * the data size is done elsewhere, so all we have to do is to actually
+ * write the data.
+ *
+ * The return value is zero if there is more space (or nothing was done)
+ * otherwise -ENOSPC is returned if the FIFO space was used up.
+ *
+ * This routine is only needed for PIO
+*/
+static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
+                                struct s3c_hsotg_ep *hs_ep,
+                                struct s3c_hsotg_req *hs_req)
+{
+        bool periodic = is_ep_periodic(hs_ep);
+        u32 gnptxsts = readl(hsotg->regs + S3C_GNPTXSTS);
+        int buf_pos = hs_req->req.actual;
+        int to_write = hs_ep->size_loaded;
+        void *data;
+        int can_write;
+        int pkt_round;
+
+        to_write -= (buf_pos - hs_ep->last_load);
+
+        /* if there's nothing to write, get out early */
+        if (to_write == 0)
+                return 0;
+
+        if (periodic) {
+                u32 epsize = readl(hsotg->regs + S3C_DIEPTSIZ(hs_ep->index));
+                int size_left;
+                int size_done;
+
+                /* work out how much data was loaded so we can calculate
+                 * how much data is left in the fifo. */
+
+                size_left = S3C_DxEPTSIZ_XferSize_GET(epsize);
+
+                dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n",
+                        __func__, size_left,
+                        hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size);
+
+                /* how much of the data has moved */
+                size_done = hs_ep->size_loaded - size_left;
+
+                /* how much data is left in the fifo */
+                can_write = hs_ep->fifo_load - size_done;
+                dev_dbg(hsotg->dev, "%s: => can_write1=%d\n",
+                        __func__, can_write);
+
+                can_write = hs_ep->fifo_size - can_write;
+                dev_dbg(hsotg->dev, "%s: => can_write2=%d\n",
+                        __func__, can_write);
+
+                if (can_write <= 0) {
+                        s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_PTxFEmp);
+                        return -ENOSPC;
+                }
+        } else {
+                if (S3C_GNPTXSTS_NPTxQSpcAvail_GET(gnptxsts) == 0) {
+                        dev_dbg(hsotg->dev,
+                                "%s: no queue slots available (0x%08x)\n",
+                                __func__, gnptxsts);
+
+                        s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_NPTxFEmp);
+                        return -ENOSPC;
+                }
+
+                can_write = S3C_GNPTXSTS_NPTxFSpcAvail_GET(gnptxsts);
+        }
+
+        dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, mps %d\n",
+                 __func__, gnptxsts, can_write, to_write, hs_ep->ep.maxpacket);
+
+        /* limit to 512 bytes of data, it seems at least on the non-periodic
+         * FIFO, requests of >512 cause the endpoint to get stuck with a
+         * fragment of the end of the transfer in it.
+         */
+        if (can_write > 512)
+                can_write = 512;
+
+        /* see if we can write data */
+
+        if (to_write > can_write) {
+                to_write = can_write;
+                pkt_round = to_write % hs_ep->ep.maxpacket;
+
+                /* Not sure, but we probably shouldn't be writing partial
+                 * packets into the FIFO, so round the write down to an
+                 * exact number of packets.
+                 *
+                 * Note, we do not currently check to see if we can ever
+                 * write a full packet or not to the FIFO.
+                 */
+
+                if (pkt_round)
+                        to_write -= pkt_round;
+
+                /* enable correct FIFO interrupt to alert us when there
+                 * is more room left. */
+
+                s3c_hsotg_en_gsint(hsotg,
+                                   periodic ? S3C_GINTSTS_PTxFEmp :
+                                   S3C_GINTSTS_NPTxFEmp);
+        }
+
+        dev_dbg(hsotg->dev, "write %d/%d, can_write %d, done %d\n",
+                 to_write, hs_req->req.length, can_write, buf_pos);
+
+        if (to_write <= 0)
+                return -ENOSPC;
+
+        hs_req->req.actual = buf_pos + to_write;
+        hs_ep->total_data += to_write;
+
+        if (periodic)
+                hs_ep->fifo_load += to_write;
+
+        to_write = DIV_ROUND_UP(to_write, 4);
+        data = hs_req->req.buf + buf_pos;
+
+        writesl(hsotg->regs + S3C_EPFIFO(hs_ep->index), data, to_write);
+
+        return (to_write >= can_write) ? -ENOSPC : 0;
+}
+
+/**
+ * get_ep_limit - get the maximum data legnth for this endpoint
+ * @hs_ep: The endpoint
+ *
+ * Return the maximum data that can be queued in one go on a given endpoint
+ * so that transfers that are too long can be split.
+ */
+static unsigned get_ep_limit(struct s3c_hsotg_ep *hs_ep)
+{
+        int index = hs_ep->index;
+        unsigned maxsize;
+        unsigned maxpkt;
+
+        if (index != 0) {
+                maxsize = S3C_DxEPTSIZ_XferSize_LIMIT + 1;
+                maxpkt = S3C_DxEPTSIZ_PktCnt_LIMIT + 1;
+        } else {
+                if (hs_ep->dir_in) {
+                        /* maxsize = S3C_DIEPTSIZ0_XferSize_LIMIT + 1; */
+                        maxsize = 64+64+1;
+                        maxpkt = S3C_DIEPTSIZ0_PktCnt_LIMIT + 1;
+                } else {
+                        maxsize = 0x3f;
+                        maxpkt = 2;
+                }
+        }
+
+        /* we made the constant loading easier above by using +1 */
+        maxpkt--;
+        maxsize--;
+
+        /* constrain by packet count if maxpkts*pktsize is greater
+         * than the length register size. */
+
+        if ((maxpkt * hs_ep->ep.maxpacket) < maxsize)
+                maxsize = maxpkt * hs_ep->ep.maxpacket;
+
+        return maxsize;
+}
+
+/**
+ * s3c_hsotg_start_req - start a USB request from an endpoint's queue
+ * @hsotg: The controller state.
+ * @hs_ep: The endpoint to process a request for
+ * @hs_req: The request to start.
+ * @continuing: True if we are doing more for the current request.
+ *
+ * Start the given request running by setting the endpoint registers
+ * appropriately, and writing any data to the FIFOs.
+ */
+static void s3c_hsotg_start_req(struct s3c_hsotg *hsotg,
+                                struct s3c_hsotg_ep *hs_ep,
+                                struct s3c_hsotg_req *hs_req,
+                                bool continuing)
+{
+        struct usb_request *ureq = &hs_req->req;
+        int index = hs_ep->index;
+        int dir_in = hs_ep->dir_in;
+        u32 epctrl_reg;
+        u32 epsize_reg;
+        u32 epsize;
+        u32 ctrl;
+        unsigned length;
+        unsigned packets;
+        unsigned maxreq;
+
+        if (index != 0) {
+                if (hs_ep->req && !continuing) {
+                        dev_err(hsotg->dev, "%s: active request\n", __func__);
+                        WARN_ON(1);
+                        return;
+                } else if (hs_ep->req != hs_req && continuing) {
+                        dev_err(hsotg->dev,
+                                "%s: continue different req\n", __func__);
+                        WARN_ON(1);
+                        return;
+                }
+        }
+
+        epctrl_reg = dir_in ? S3C_DIEPCTL(index) : S3C_DOEPCTL(index);
+        epsize_reg = dir_in ? S3C_DIEPTSIZ(index) : S3C_DOEPTSIZ(index);
+
+        dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x, ep %d, dir %s\n",
+                __func__, readl(hsotg->regs + epctrl_reg), index,
+                hs_ep->dir_in ? "in" : "out");
+
+        length = ureq->length - ureq->actual;
+
+        if (0)
+                dev_dbg(hsotg->dev,
+                        "REQ buf %p len %d dma 0x%08x noi=%d zp=%d snok=%d\n",
+                        ureq->buf, length, ureq->dma,
+                        ureq->no_interrupt, ureq->zero, ureq->short_not_ok);
+
+        maxreq = get_ep_limit(hs_ep);
+        if (length > maxreq) {
+                int round = maxreq % hs_ep->ep.maxpacket;
+
+                dev_dbg(hsotg->dev, "%s: length %d, max-req %d, r %d\n",
+                        __func__, length, maxreq, round);
+
+                /* round down to multiple of packets */
+                if (round)
+                        maxreq -= round;
+
+                length = maxreq;
+        }
+
+        if (length)
+                packets = DIV_ROUND_UP(length, hs_ep->ep.maxpacket);
+        else
+                packets = 1;    /* send one packet if length is zero. */
+
+        if (dir_in && index != 0)
+                epsize = S3C_DxEPTSIZ_MC(1);
+        else
+                epsize = 0;
+
+        if (index != 0 && ureq->zero) {
+                /* test for the packets being exactly right for the
+                 * transfer */
+
+                if (length == (packets * hs_ep->ep.maxpacket))
+                        packets++;
+        }
+
+        epsize |= S3C_DxEPTSIZ_PktCnt(packets);
+        epsize |= S3C_DxEPTSIZ_XferSize(length);
+
+        dev_dbg(hsotg->dev, "%s: %d@%d/%d, 0x%08x => 0x%08x\n",
+                __func__, packets, length, ureq->length, epsize, epsize_reg);
+
+        /* store the request as the current one we're doing */
+        hs_ep->req = hs_req;
+
+        /* write size / packets */
+        writel(epsize, hsotg->regs + epsize_reg);
+
+        ctrl = readl(hsotg->regs + epctrl_reg);
+
+        if (ctrl & S3C_DxEPCTL_Stall) {
+                dev_warn(hsotg->dev, "%s: ep%d is stalled\n", __func__, index);
+
+                /* not sure what we can do here, if it is EP0 then we should
+                 * get this cleared once the endpoint has transmitted the
+                 * STALL packet, otherwise it needs to be cleared by the
+                 * host.
+                 */
+        }
+
+        if (using_dma(hsotg)) {
+                unsigned int dma_reg;
+
+                /* write DMA address to control register, buffer already
+                 * synced by s3c_hsotg_ep_queue().  */
+
+                dma_reg = dir_in ? S3C_DIEPDMA(index) : S3C_DOEPDMA(index);
+                writel(ureq->dma, hsotg->regs + dma_reg);
+
+                dev_dbg(hsotg->dev, "%s: 0x%08x => 0x%08x\n",
+                        __func__, ureq->dma, dma_reg);
+        }
+
+        ctrl |= S3C_DxEPCTL_EPEna;      /* ensure ep enabled */
+        ctrl |= S3C_DxEPCTL_USBActEp;
+        ctrl |= S3C_DxEPCTL_CNAK;       /* clear NAK set by core */
+
+        dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl);
+        writel(ctrl, hsotg->regs + epctrl_reg);
+
+        /* set these, it seems that DMA support increments past the end
+         * of the packet buffer so we need to calculate the length from
+         * this information. */
+        hs_ep->size_loaded = length;
+        hs_ep->last_load = ureq->actual;
+
+        if (dir_in && !using_dma(hsotg)) {
+                /* set these anyway, we may need them for non-periodic in */
+                hs_ep->fifo_load = 0;
+
+                s3c_hsotg_write_fifo(hsotg, hs_ep, hs_req);
+        }
+
+        /* clear the INTknTXFEmpMsk when we start request, more as a aide
+         * to debugging to see what is going on. */
+        if (dir_in)
+                writel(S3C_DIEPMSK_INTknTXFEmpMsk,
+                       hsotg->regs + S3C_DIEPINT(index));
+
+        /* Note, trying to clear the NAK here causes problems with transmit
+         * on the S3C6400 ending up with the TXFIFO becomming full. */
+
+        /* check ep is enabled */
+        if (!(readl(hsotg->regs + epctrl_reg) & S3C_DxEPCTL_EPEna))
+                dev_warn(hsotg->dev,
+                         "ep%d: failed to become enabled (DxEPCTL=0x%08x)?\n",
+                         index, readl(hsotg->regs + epctrl_reg));
+
+        dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n",
+                __func__, readl(hsotg->regs + epctrl_reg));
+}
+
+/**
+ * s3c_hsotg_map_dma - map the DMA memory being used for the request
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint the request is on.
+ * @req: The request being processed.
+ *
+ * We've been asked to queue a request, so ensure that the memory buffer
+ * is correctly setup for DMA. If we've been passed an extant DMA address
+ * then ensure the buffer has been synced to memory. If our buffer has no
+ * DMA memory, then we map the memory and mark our request to allow us to
+ * cleanup on completion.
+*/
+static int s3c_hsotg_map_dma(struct s3c_hsotg *hsotg,
+                             struct s3c_hsotg_ep *hs_ep,
+                             struct usb_request *req)
+{
+        enum dma_data_direction dir;
+        struct s3c_hsotg_req *hs_req = our_req(req);
+
+        dir = hs_ep->dir_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+        /* if the length is zero, ignore the DMA data */
+        if (hs_req->req.length == 0)
+                return 0;
+
+        if (req->dma == DMA_ADDR_INVALID) {
+                dma_addr_t dma;
+
+                dma = dma_map_single(hsotg->dev, req->buf, req->length, dir);
+
+                if (unlikely(dma_mapping_error(hsotg->dev, dma)))
+                        goto dma_error;
+
+                if (dma & 3) {
+                        dev_err(hsotg->dev, "%s: unaligned dma buffer\n",
+                                __func__);
+
+                        dma_unmap_single(hsotg->dev, dma, req->length, dir);
+                        return -EINVAL;
+                }
+
+                hs_req->mapped = 1;
+                req->dma = dma;
+        } else {
+                dma_sync_single(hsotg->dev, req->dma, req->length, dir);
+                hs_req->mapped = 0;
+        }
+
+        return 0;
+
+dma_error:
+        dev_err(hsotg->dev, "%s: failed to map buffer %p, %d bytes\n",
+                __func__, req->buf, req->length);
+
+        return -EIO;
+}
+
+static int s3c_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req,
+                              gfp_t gfp_flags)
+{
+        struct s3c_hsotg_req *hs_req = our_req(req);
+        struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+        struct s3c_hsotg *hs = hs_ep->parent;
+        unsigned long irqflags;
+        bool first;
+
+        dev_dbg(hs->dev, "%s: req %p: %d@%p, noi=%d, zero=%d, snok=%d\n",
+                ep->name, req, req->length, req->buf, req->no_interrupt,
+                req->zero, req->short_not_ok);
+
+        /* initialise status of the request */
+        INIT_LIST_HEAD(&hs_req->queue);
+        req->actual = 0;
+        req->status = -EINPROGRESS;
+
+        /* if we're using DMA, sync the buffers as necessary */
+        if (using_dma(hs)) {
+                int ret = s3c_hsotg_map_dma(hs, hs_ep, req);
+                if (ret)
+                        return ret;
+        }
+
+        spin_lock_irqsave(&hs_ep->lock, irqflags);
+
+        first = list_empty(&hs_ep->queue);
+        list_add_tail(&hs_req->queue, &hs_ep->queue);
+
+        if (first)
+                s3c_hsotg_start_req(hs, hs_ep, hs_req, false);
+
+        spin_unlock_irqrestore(&hs_ep->lock, irqflags);
+
+        return 0;
+}
+
+static void s3c_hsotg_ep_free_request(struct usb_ep *ep,
+                                      struct usb_request *req)
+{
+        struct s3c_hsotg_req *hs_req = our_req(req);
+
+        kfree(hs_req);
+}
+
+/**
+ * s3c_hsotg_complete_oursetup - setup completion callback
+ * @ep: The endpoint the request was on.
+ * @req: The request completed.
+ *
+ * Called on completion of any requests the driver itself
+ * submitted that need cleaning up.
+ */
+static void s3c_hsotg_complete_oursetup(struct usb_ep *ep,
+                                        struct usb_request *req)
+{
+        struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+        struct s3c_hsotg *hsotg = hs_ep->parent;
+
+        dev_dbg(hsotg->dev, "%s: ep %p, req %p\n", __func__, ep, req);
+
+        s3c_hsotg_ep_free_request(ep, req);
+}
+
+/**
+ * ep_from_windex - convert control wIndex value to endpoint
+ * @hsotg: The driver state.
+ * @windex: The control request wIndex field (in host order).
+ *
+ * Convert the given wIndex into a pointer to an driver endpoint
+ * structure, or return NULL if it is not a valid endpoint.
+*/
+static struct s3c_hsotg_ep *ep_from_windex(struct s3c_hsotg *hsotg,
+                                           u32 windex)
+{
+        struct s3c_hsotg_ep *ep = &hsotg->eps[windex & 0x7F];
+        int dir = (windex & USB_DIR_IN) ? 1 : 0;
+        int idx = windex & 0x7F;
+
+        if (windex >= 0x100)
+                return NULL;
+
+        if (idx > S3C_HSOTG_EPS)
+                return NULL;
+
+        if (idx && ep->dir_in != dir)
+                return NULL;
+
+        return ep;
+}
+
+/**
+ * s3c_hsotg_send_reply - send reply to control request
+ * @hsotg: The device state
+ * @ep: Endpoint 0
+ * @buff: Buffer for request
+ * @length: Length of reply.
+ *
+ * Create a request and queue it on the given endpoint. This is useful as
+ * an internal method of sending replies to certain control requests, etc.
+ */
+static int s3c_hsotg_send_reply(struct s3c_hsotg *hsotg,
+                                struct s3c_hsotg_ep *ep,
+                                void *buff,
+                                int length)
+{
+        struct usb_request *req;
+        int ret;
+
+        dev_dbg(hsotg->dev, "%s: buff %p, len %d\n", __func__, buff, length);
+
+        req = s3c_hsotg_ep_alloc_request(&ep->ep, GFP_ATOMIC);
+        hsotg->ep0_reply = req;
+        if (!req) {
+                dev_warn(hsotg->dev, "%s: cannot alloc req\n", __func__);
+                return -ENOMEM;
+        }
+
+        req->buf = hsotg->ep0_buff;
+        req->length = length;
+        req->zero = 1; /* always do zero-length final transfer */
+        req->complete = s3c_hsotg_complete_oursetup;
+
+        if (length)
+                memcpy(req->buf, buff, length);
+        else
+                ep->sent_zlp = 1;
+
+        ret = s3c_hsotg_ep_queue(&ep->ep, req, GFP_ATOMIC);
+        if (ret) {
+                dev_warn(hsotg->dev, "%s: cannot queue req\n", __func__);
+                return ret;
+        }
+
+        return 0;
+}
+
+/**
+ * s3c_hsotg_process_req_status - process request GET_STATUS
+ * @hsotg: The device state
+ * @ctrl: USB control request
+ */
+static int s3c_hsotg_process_req_status(struct s3c_hsotg *hsotg,
+                                        struct usb_ctrlrequest *ctrl)
+{
+        struct s3c_hsotg_ep *ep0 = &hsotg->eps[0];
+        struct s3c_hsotg_ep *ep;
+        __le16 reply;
+        int ret;
+
+        dev_dbg(hsotg->dev, "%s: USB_REQ_GET_STATUS\n", __func__);
+
+        if (!ep0->dir_in) {
+                dev_warn(hsotg->dev, "%s: direction out?\n", __func__);
+                return -EINVAL;
+        }
+
+        switch (ctrl->bRequestType & USB_RECIP_MASK) {
+        case USB_RECIP_DEVICE:
+                reply = cpu_to_le16(0); /* bit 0 => self powered,
+                                         * bit 1 => remote wakeup */
+                break;
+
+        case USB_RECIP_INTERFACE:
+                /* currently, the data result should be zero */
+                reply = cpu_to_le16(0);
+                break;
+
+        case USB_RECIP_ENDPOINT:
+                ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex));
+                if (!ep)
+                        return -ENOENT;
+
+                reply = cpu_to_le16(ep->halted ? 1 : 0);
+                break;
+
+        default:
+                return 0;
+        }
+
+        if (le16_to_cpu(ctrl->wLength) != 2)
+                return -EINVAL;
+
+        ret = s3c_hsotg_send_reply(hsotg, ep0, &reply, 2);
+        if (ret) {
+                dev_err(hsotg->dev, "%s: failed to send reply\n", __func__);
+                return ret;
+        }
+
+        return 1;
+}
+
+static int s3c_hsotg_ep_sethalt(struct usb_ep *ep, int value);
+
+/**
+ * s3c_hsotg_process_req_featire - process request {SET,CLEAR}_FEATURE
+ * @hsotg: The device state
+ * @ctrl: USB control request
+ */
+static int s3c_hsotg_process_req_feature(struct s3c_hsotg *hsotg,
+                                         struct usb_ctrlrequest *ctrl)
+{
+        bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
+        struct s3c_hsotg_ep *ep;
+
+        dev_dbg(hsotg->dev, "%s: %s_FEATURE\n",
+                __func__, set ? "SET" : "CLEAR");
+
+        if (ctrl->bRequestType == USB_RECIP_ENDPOINT) {
+                ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex));
+                if (!ep) {
+                        dev_dbg(hsotg->dev, "%s: no endpoint for 0x%04x\n",
+                                __func__, le16_to_cpu(ctrl->wIndex));
+                        return -ENOENT;
+                }
+
+                switch (le16_to_cpu(ctrl->wValue)) {
+                case USB_ENDPOINT_HALT:
+                        s3c_hsotg_ep_sethalt(&ep->ep, set);
+                        break;
+
+                default:
+                        return -ENOENT;
+                }
+        } else
+                return -ENOENT;  /* currently only deal with endpoint */
+
+        return 1;
+}
+
+/**
+ * s3c_hsotg_process_control - process a control request
+ * @hsotg: The device state
+ * @ctrl: The control request received
+ *
+ * The controller has received the SETUP phase of a control request, and
+ * needs to work out what to do next (and whether to pass it on to the
+ * gadget driver).
+ */
+static void s3c_hsotg_process_control(struct s3c_hsotg *hsotg,
+                                      struct usb_ctrlrequest *ctrl)
+{
+        struct s3c_hsotg_ep *ep0 = &hsotg->eps[0];
+        int ret = 0;
+        u32 dcfg;
+
+        ep0->sent_zlp = 0;
+
+        dev_dbg(hsotg->dev, "ctrl Req=%02x, Type=%02x, V=%04x, L=%04x\n",
+                 ctrl->bRequest, ctrl->bRequestType,
+                 ctrl->wValue, ctrl->wLength);
+
+        /* record the direction of the request, for later use when enquing
+         * packets onto EP0. */
+
+        ep0->dir_in = (ctrl->bRequestType & USB_DIR_IN) ? 1 : 0;
+        dev_dbg(hsotg->dev, "ctrl: dir_in=%d\n", ep0->dir_in);
+
+        /* if we've no data with this request, then the last part of the
+         * transaction is going to implicitly be IN. */
+        if (ctrl->wLength == 0)
+                ep0->dir_in = 1;
+
+        if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
+                switch (ctrl->bRequest) {
+                case USB_REQ_SET_ADDRESS:
+                        dcfg = readl(hsotg->regs + S3C_DCFG);
+                        dcfg &= ~S3C_DCFG_DevAddr_MASK;
+                        dcfg |= ctrl->wValue << S3C_DCFG_DevAddr_SHIFT;
+                        writel(dcfg, hsotg->regs + S3C_DCFG);
+
+                        dev_info(hsotg->dev, "new address %d\n", ctrl->wValue);
+
+                        ret = s3c_hsotg_send_reply(hsotg, ep0, NULL, 0);
+                        return;
+
+                case USB_REQ_GET_STATUS:
+                        ret = s3c_hsotg_process_req_status(hsotg, ctrl);
+                        break;
+
+                case USB_REQ_CLEAR_FEATURE:
+                case USB_REQ_SET_FEATURE:
+                        ret = s3c_hsotg_process_req_feature(hsotg, ctrl);
+                        break;
+                }
+        }
+
+        /* as a fallback, try delivering it to the driver to deal with */
+
+        if (ret == 0 && hsotg->driver) {
+                ret = hsotg->driver->setup(&hsotg->gadget, ctrl);
+                if (ret < 0)
+                        dev_dbg(hsotg->dev, "driver->setup() ret %d\n", ret);
+        }
+
+        if (ret > 0) {
+                if (!ep0->dir_in) {
+                        /* need to generate zlp in reply or take data */
+                        /* todo - deal with any data we might be sent? */
+                        ret = s3c_hsotg_send_reply(hsotg, ep0, NULL, 0);
+                }
+        }
+
+        /* the request is either unhandlable, or is not formatted correctly
+         * so respond with a STALL for the status stage to indicate failure.
+         */
+
+        if (ret < 0) {
+                u32 reg;
+                u32 ctrl;
+
+                dev_dbg(hsotg->dev, "ep0 stall (dir=%d)\n", ep0->dir_in);
+                reg = (ep0->dir_in) ? S3C_DIEPCTL0 : S3C_DOEPCTL0;
+
+                /* S3C_DxEPCTL_Stall will be cleared by EP once it has
+                 * taken effect, so no need to clear later. */
+
+                ctrl = readl(hsotg->regs + reg);
+                ctrl |= S3C_DxEPCTL_Stall;
+                ctrl |= S3C_DxEPCTL_CNAK;
+                writel(ctrl, hsotg->regs + reg);
+
+                dev_dbg(hsotg->dev,
+                        "writen DxEPCTL=0x%08x to %08x (DxEPCTL=0x%08x)\n",
+                        ctrl, reg, readl(hsotg->regs + reg));
+
+                /* don't belive we need to anything more to get the EP
+                 * to reply with a STALL packet */
+        }
+}
+
+static void s3c_hsotg_enqueue_setup(struct s3c_hsotg *hsotg);
+
+/**
+ * s3c_hsotg_complete_setup - completion of a setup transfer
+ * @ep: The endpoint the request was on.
+ * @req: The request completed.
+ *
+ * Called on completion of any requests the driver itself submitted for
+ * EP0 setup packets
+ */
+static void s3c_hsotg_complete_setup(struct usb_ep *ep,
+                                     struct usb_request *req)
+{
+        struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+        struct s3c_hsotg *hsotg = hs_ep->parent;
+
+        if (req->status < 0) {
+                dev_dbg(hsotg->dev, "%s: failed %d\n", __func__, req->status);
+                return;
+        }
+
+        if (req->actual == 0)
+                s3c_hsotg_enqueue_setup(hsotg);
+        else
+                s3c_hsotg_process_control(hsotg, req->buf);
+}
+
+/**
+ * s3c_hsotg_enqueue_setup - start a request for EP0 packets
+ * @hsotg: The device state.
+ *
+ * Enqueue a request on EP0 if necessary to received any SETUP packets
+ * received from the host.
+ */
+static void s3c_hsotg_enqueue_setup(struct s3c_hsotg *hsotg)
+{
+        struct usb_request *req = hsotg->ctrl_req;
+        struct s3c_hsotg_req *hs_req = our_req(req);
+        int ret;
+
+        dev_dbg(hsotg->dev, "%s: queueing setup request\n", __func__);
+
+        req->zero = 0;
+        req->length = 8;
+        req->buf = hsotg->ctrl_buff;
+        req->complete = s3c_hsotg_complete_setup;
+
+        if (!list_empty(&hs_req->queue)) {
+                dev_dbg(hsotg->dev, "%s already queued???\n", __func__);
+                return;
+        }
+
+        hsotg->eps[0].dir_in = 0;
+
+        ret = s3c_hsotg_ep_queue(&hsotg->eps[0].ep, req, GFP_ATOMIC);
+        if (ret < 0) {
+                dev_err(hsotg->dev, "%s: failed queue (%d)\n", __func__, ret);
+                /* Don't think there's much we can do other than watch the
+                 * driver fail. */
+        }
+}
+
+/**
+ * get_ep_head - return the first request on the endpoint
+ * @hs_ep: The controller endpoint to get
+ *
+ * Get the first request on the endpoint.
+*/
+static struct s3c_hsotg_req *get_ep_head(struct s3c_hsotg_ep *hs_ep)
+{
+        if (list_empty(&hs_ep->queue))
+                return NULL;
+
+        return list_first_entry(&hs_ep->queue, struct s3c_hsotg_req, queue);
+}
+
+/**
+ * s3c_hsotg_complete_request - complete a request given to us
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint the request was on.
+ * @hs_req: The request to complete.
+ * @result: The result code (0 => Ok, otherwise errno)
+ *
+ * The given request has finished, so call the necessary completion
+ * if it has one and then look to see if we can start a new request
+ * on the endpoint.
+ *
+ * Note, expects the ep to already be locked as appropriate.
+*/
+static void s3c_hsotg_complete_request(struct s3c_hsotg *hsotg,
+                                       struct s3c_hsotg_ep *hs_ep,
+                                       struct s3c_hsotg_req *hs_req,
+                                       int result)
+{
+        bool restart;
+
+        if (!hs_req) {
+                dev_dbg(hsotg->dev, "%s: nothing to complete?\n", __func__);
+                return;
+        }
+
+        dev_dbg(hsotg->dev, "complete: ep %p %s, req %p, %d => %p\n",
+                hs_ep, hs_ep->ep.name, hs_req, result, hs_req->req.complete);
+
+        /* only replace the status if we've not already set an error
+         * from a previous transaction */
+
+        if (hs_req->req.status == -EINPROGRESS)
+                hs_req->req.status = result;
+
+        hs_ep->req = NULL;
+        list_del_init(&hs_req->queue);
+
+        if (using_dma(hsotg))
+                s3c_hsotg_unmap_dma(hsotg, hs_ep, hs_req);
+
+        /* call the complete request with the locks off, just in case the
+         * request tries to queue more work for this endpoint. */
+
+        if (hs_req->req.complete) {
+                spin_unlock(&hs_ep->lock);
+                hs_req->req.complete(&hs_ep->ep, &hs_req->req);
+                spin_lock(&hs_ep->lock);
+        }
+
+        /* Look to see if there is anything else to do. Note, the completion
+         * of the previous request may have caused a new request to be started
+         * so be careful when doing this. */
+
+        if (!hs_ep->req && result >= 0) {
+                restart = !list_empty(&hs_ep->queue);
+                if (restart) {
+                        hs_req = get_ep_head(hs_ep);
+                        s3c_hsotg_start_req(hsotg, hs_ep, hs_req, false);
+                }
+        }
+}
+
+/**
+ * s3c_hsotg_complete_request_lock - complete a request given to us (locked)
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint the request was on.
+ * @hs_req: The request to complete.
+ * @result: The result code (0 => Ok, otherwise errno)
+ *
+ * See s3c_hsotg_complete_request(), but called with the endpoint's
+ * lock held.
+*/
+static void s3c_hsotg_complete_request_lock(struct s3c_hsotg *hsotg,
+                                            struct s3c_hsotg_ep *hs_ep,
+                                            struct s3c_hsotg_req *hs_req,
+                                            int result)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&hs_ep->lock, flags);
+        s3c_hsotg_complete_request(hsotg, hs_ep, hs_req, result);
+        spin_unlock_irqrestore(&hs_ep->lock, flags);
+}
+
+/**
+ * s3c_hsotg_rx_data - receive data from the FIFO for an endpoint
+ * @hsotg: The device state.
+ * @ep_idx: The endpoint index for the data
+ * @size: The size of data in the fifo, in bytes
+ *
+ * The FIFO status shows there is data to read from the FIFO for a given
+ * endpoint, so sort out whether we need to read the data into a request
+ * that has been made for that endpoint.
+ */
+static void s3c_hsotg_rx_data(struct s3c_hsotg *hsotg, int ep_idx, int size)
+{
+        struct s3c_hsotg_ep *hs_ep = &hsotg->eps[ep_idx];
+        struct s3c_hsotg_req *hs_req = hs_ep->req;
+        void __iomem *fifo = hsotg->regs + S3C_EPFIFO(ep_idx);
+        int to_read;
+        int max_req;
+        int read_ptr;
+
+        if (!hs_req) {
+                u32 epctl = readl(hsotg->regs + S3C_DOEPCTL(ep_idx));
+                int ptr;
+
+                dev_warn(hsotg->dev,
+                         "%s: FIFO %d bytes on ep%d but no req (DxEPCTl=0x%08x)\n",
+                         __func__, size, ep_idx, epctl);
+
+                /* dump the data from the FIFO, we've nothing we can do */
+                for (ptr = 0; ptr < size; ptr += 4)
+                        (void)readl(fifo);
+
+                return;
+        }
+
+        spin_lock(&hs_ep->lock);
+
+        to_read = size;
+        read_ptr = hs_req->req.actual;
+        max_req = hs_req->req.length - read_ptr;
+
+        if (to_read > max_req) {
+                /* more data appeared than we where willing
+                 * to deal with in this request.
+                 */
+
+                /* currently we don't deal this */
+                WARN_ON_ONCE(1);
+        }
+
+        dev_dbg(hsotg->dev, "%s: read %d/%d, done %d/%d\n",
+                __func__, to_read, max_req, read_ptr, hs_req->req.length);
+
+        hs_ep->total_data += to_read;
+        hs_req->req.actual += to_read;
+        to_read = DIV_ROUND_UP(to_read, 4);
+
+        /* note, we might over-write the buffer end by 3 bytes depending on
+         * alignment of the data. */
+        readsl(fifo, hs_req->req.buf + read_ptr, to_read);
+
+        spin_unlock(&hs_ep->lock);
+}
+
+/**
+ * s3c_hsotg_send_zlp - send zero-length packet on control endpoint
+ * @hsotg: The device instance
+ * @req: The request currently on this endpoint
+ *
+ * Generate a zero-length IN packet request for terminating a SETUP
+ * transaction.
+ *
+ * Note, since we don't write any data to the TxFIFO, then it is
+ * currently belived that we do not need to wait for any space in
+ * the TxFIFO.
+ */
+static void s3c_hsotg_send_zlp(struct s3c_hsotg *hsotg,
+                               struct s3c_hsotg_req *req)
+{
+        u32 ctrl;
+
+        if (!req) {
+                dev_warn(hsotg->dev, "%s: no request?\n", __func__);
+                return;
+        }
+
+        if (req->req.length == 0) {
+                hsotg->eps[0].sent_zlp = 1;
+                s3c_hsotg_enqueue_setup(hsotg);
+                return;
+        }
+
+        hsotg->eps[0].dir_in = 1;
+        hsotg->eps[0].sent_zlp = 1;
+
+        dev_dbg(hsotg->dev, "sending zero-length packet\n");
+
+        /* issue a zero-sized packet to terminate this */
+        writel(S3C_DxEPTSIZ_MC(1) | S3C_DxEPTSIZ_PktCnt(1) |
+               S3C_DxEPTSIZ_XferSize(0), hsotg->regs + S3C_DIEPTSIZ(0));
+
+        ctrl = readl(hsotg->regs + S3C_DIEPCTL0);
+        ctrl |= S3C_DxEPCTL_CNAK;  /* clear NAK set by core */
+        ctrl |= S3C_DxEPCTL_EPEna; /* ensure ep enabled */
+        ctrl |= S3C_DxEPCTL_USBActEp;
+        writel(ctrl, hsotg->regs + S3C_DIEPCTL0);
+}
+
+/**
+ * s3c_hsotg_handle_outdone - handle receiving OutDone/SetupDone from RXFIFO
+ * @hsotg: The device instance
+ * @epnum: The endpoint received from
+ * @was_setup: Set if processing a SetupDone event.
+ *
+ * The RXFIFO has delivered an OutDone event, which means that the data
+ * transfer for an OUT endpoint has been completed, either by a short
+ * packet or by the finish of a transfer.
+*/
+static void s3c_hsotg_handle_outdone(struct s3c_hsotg *hsotg,
+                                     int epnum, bool was_setup)
+{
+        struct s3c_hsotg_ep *hs_ep = &hsotg->eps[epnum];
+        struct s3c_hsotg_req *hs_req = hs_ep->req;
+        struct usb_request *req = &hs_req->req;
+        int result = 0;
+
+        if (!hs_req) {
+                dev_dbg(hsotg->dev, "%s: no request active\n", __func__);
+                return;
+        }
+
+        if (using_dma(hsotg)) {
+                u32 epsize = readl(hsotg->regs + S3C_DOEPTSIZ(epnum));
+                unsigned size_done;
+                unsigned size_left;
+
+                /* Calculate the size of the transfer by checking how much
+                 * is left in the endpoint size register and then working it
+                 * out from the amount we loaded for the transfer.
+                 *
+                 * We need to do this as DMA pointers are always 32bit aligned
+                 * so may overshoot/undershoot the transfer.
+                 */
+
+                size_left = S3C_DxEPTSIZ_XferSize_GET(epsize);
+
+                size_done = hs_ep->size_loaded - size_left;
+                size_done += hs_ep->last_load;
+
+                req->actual = size_done;
+        }
+
+        if (req->actual < req->length && req->short_not_ok) {
+                dev_dbg(hsotg->dev, "%s: got %d/%d (short not ok) => error\n",
+                        __func__, req->actual, req->length);
+
+                /* todo - what should we return here? there's no one else
+                 * even bothering to check the status. */
+        }
+
+        if (epnum == 0) {
+                if (!was_setup && req->complete != s3c_hsotg_complete_setup)
+                        s3c_hsotg_send_zlp(hsotg, hs_req);
+        }
+
+        s3c_hsotg_complete_request_lock(hsotg, hs_ep, hs_req, result);
+}
+
+/**
+ * s3c_hsotg_read_frameno - read current frame number
+ * @hsotg: The device instance
+ *
+ * Return the current frame number
+*/
+static u32 s3c_hsotg_read_frameno(struct s3c_hsotg *hsotg)
+{
+        u32 dsts;
+
+        dsts = readl(hsotg->regs + S3C_DSTS);
+        dsts &= S3C_DSTS_SOFFN_MASK;
+        dsts >>= S3C_DSTS_SOFFN_SHIFT;
+
+        return dsts;
+}
+
+/**
+ * s3c_hsotg_handle_rx - RX FIFO has data
+ * @hsotg: The device instance
+ *
+ * The IRQ handler has detected that the RX FIFO has some data in it
+ * that requires processing, so find out what is in there and do the
+ * appropriate read.
+ *
+ * The RXFIFO is a true FIFO, the packets comming out are still in packet
+ * chunks, so if you have x packets received on an endpoint you'll get x
+ * FIFO events delivered, each with a packet's worth of data in it.
+ *
+ * When using DMA, we should not be processing events from the RXFIFO
+ * as the actual data should be sent to the memory directly and we turn
+ * on the completion interrupts to get notifications of transfer completion.
+ */
+void s3c_hsotg_handle_rx(struct s3c_hsotg *hsotg)
+{
+        u32 grxstsr = readl(hsotg->regs + S3C_GRXSTSP);
+        u32 epnum, status, size;
+
+        WARN_ON(using_dma(hsotg));
+
+        epnum = grxstsr & S3C_GRXSTS_EPNum_MASK;
+        status = grxstsr & S3C_GRXSTS_PktSts_MASK;
+
+        size = grxstsr & S3C_GRXSTS_ByteCnt_MASK;
+        size >>= S3C_GRXSTS_ByteCnt_SHIFT;
+
+        if (1)
+                dev_dbg(hsotg->dev, "%s: GRXSTSP=0x%08x (%d@%d)\n",
+                        __func__, grxstsr, size, epnum);
+
+#define __status(x) ((x) >> S3C_GRXSTS_PktSts_SHIFT)
+
+        switch (status >> S3C_GRXSTS_PktSts_SHIFT) {
+        case __status(S3C_GRXSTS_PktSts_GlobalOutNAK):
+                dev_dbg(hsotg->dev, "GlobalOutNAK\n");
+                break;
+
+        case __status(S3C_GRXSTS_PktSts_OutDone):
+                dev_dbg(hsotg->dev, "OutDone (Frame=0x%08x)\n",
+                        s3c_hsotg_read_frameno(hsotg));
+
+                if (!using_dma(hsotg))
+                        s3c_hsotg_handle_outdone(hsotg, epnum, false);
+                break;
+
+        case __status(S3C_GRXSTS_PktSts_SetupDone):
+                dev_dbg(hsotg->dev,
+                        "SetupDone (Frame=0x%08x, DOPEPCTL=0x%08x)\n",
+                        s3c_hsotg_read_frameno(hsotg),
+                        readl(hsotg->regs + S3C_DOEPCTL(0)));
+
+                s3c_hsotg_handle_outdone(hsotg, epnum, true);
+                break;
+
+        case __status(S3C_GRXSTS_PktSts_OutRX):
+                s3c_hsotg_rx_data(hsotg, epnum, size);
+                break;
+
+        case __status(S3C_GRXSTS_PktSts_SetupRX):
+                dev_dbg(hsotg->dev,
+                        "SetupRX (Frame=0x%08x, DOPEPCTL=0x%08x)\n",
+                        s3c_hsotg_read_frameno(hsotg),
+                        readl(hsotg->regs + S3C_DOEPCTL(0)));
+
+                s3c_hsotg_rx_data(hsotg, epnum, size);
+                break;
+
+        default:
+                dev_warn(hsotg->dev, "%s: unknown status %08x\n",
+                         __func__, grxstsr);
+
+                s3c_hsotg_dump(hsotg);
+                break;
+        }
+}
+
+/**
+ * s3c_hsotg_ep0_mps - turn max packet size into register setting
+ * @mps: The maximum packet size in bytes.
+*/
+static u32 s3c_hsotg_ep0_mps(unsigned int mps)
+{
+        switch (mps) {
+        case 64:
+                return S3C_D0EPCTL_MPS_64;
+        case 32:
+                return S3C_D0EPCTL_MPS_32;
+        case 16:
+                return S3C_D0EPCTL_MPS_16;
+        case 8:
+                return S3C_D0EPCTL_MPS_8;
+        }
+
+        /* bad max packet size, warn and return invalid result */
+        WARN_ON(1);
+        return (u32)-1;
+}
+
+/**
+ * s3c_hsotg_set_ep_maxpacket - set endpoint's max-packet field
+ * @hsotg: The driver state.
+ * @ep: The index number of the endpoint
+ * @mps: The maximum packet size in bytes
+ *
+ * Configure the maximum packet size for the given endpoint, updating
+ * the hardware control registers to reflect this.
+ */
+static void s3c_hsotg_set_ep_maxpacket(struct s3c_hsotg *hsotg,
+                                       unsigned int ep, unsigned int mps)
+{
+        struct s3c_hsotg_ep *hs_ep = &hsotg->eps[ep];
+        void __iomem *regs = hsotg->regs;
+        u32 mpsval;
+        u32 reg;
+
+        if (ep == 0) {
+                /* EP0 is a special case */
+                mpsval = s3c_hsotg_ep0_mps(mps);
+                if (mpsval > 3)
+                        goto bad_mps;
+        } else {
+                if (mps >= S3C_DxEPCTL_MPS_LIMIT+1)
+                        goto bad_mps;
+
+                mpsval = mps;
+        }
+
+        hs_ep->ep.maxpacket = mps;
+
+        /* update both the in and out endpoint controldir_ registers, even
+         * if one of the directions may not be in use. */
+
+        reg = readl(regs + S3C_DIEPCTL(ep));
+        reg &= ~S3C_DxEPCTL_MPS_MASK;
+        reg |= mpsval;
+        writel(reg, regs + S3C_DIEPCTL(ep));
+
+        reg = readl(regs + S3C_DOEPCTL(ep));
+        reg &= ~S3C_DxEPCTL_MPS_MASK;
+        reg |= mpsval;
+        writel(reg, regs + S3C_DOEPCTL(ep));
+
+        return;
+
+bad_mps:
+        dev_err(hsotg->dev, "ep%d: bad mps of %d\n", ep, mps);
+}
+
+
+/**
+ * s3c_hsotg_trytx - check to see if anything needs transmitting
+ * @hsotg: The driver state
+ * @hs_ep: The driver endpoint to check.
+ *
+ * Check to see if there is a request that has data to send, and if so
+ * make an attempt to write data into the FIFO.
+ */
+static int s3c_hsotg_trytx(struct s3c_hsotg *hsotg,
+                           struct s3c_hsotg_ep *hs_ep)
+{
+        struct s3c_hsotg_req *hs_req = hs_ep->req;
+
+        if (!hs_ep->dir_in || !hs_req)
+                return 0;
+
+        if (hs_req->req.actual < hs_req->req.length) {
+                dev_dbg(hsotg->dev, "trying to write more for ep%d\n",
+                        hs_ep->index);
+                return s3c_hsotg_write_fifo(hsotg, hs_ep, hs_req);
+        }
+
+        return 0;
+}
+
+/**
+ * s3c_hsotg_complete_in - complete IN transfer
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint that has just completed.
+ *
+ * An IN transfer has been completed, update the transfer's state and then
+ * call the relevant completion routines.
+ */
+static void s3c_hsotg_complete_in(struct s3c_hsotg *hsotg,
+                                  struct s3c_hsotg_ep *hs_ep)
+{
+        struct s3c_hsotg_req *hs_req = hs_ep->req;
+        u32 epsize = readl(hsotg->regs + S3C_DIEPTSIZ(hs_ep->index));
+        int size_left, size_done;
+
+        if (!hs_req) {
+                dev_dbg(hsotg->dev, "XferCompl but no req\n");
+                return;
+        }
+
+        /* Calculate the size of the transfer by checking how much is left
+         * in the endpoint size register and then working it out from
+         * the amount we loaded for the transfer.
+         *
+         * We do this even for DMA, as the transfer may have incremented
+         * past the end of the buffer (DMA transfers are always 32bit
+         * aligned).
+         */
+
+        size_left = S3C_DxEPTSIZ_XferSize_GET(epsize);
+
+        size_done = hs_ep->size_loaded - size_left;
+        size_done += hs_ep->last_load;
+
+        if (hs_req->req.actual != size_done)
+                dev_dbg(hsotg->dev, "%s: adjusting size done %d => %d\n",
+                        __func__, hs_req->req.actual, size_done);
+
+        hs_req->req.actual = size_done;
+
+        /* if we did all of the transfer, and there is more data left
+         * around, then try restarting the rest of the request */
+
+        if (!size_left && hs_req->req.actual < hs_req->req.length) {
+                dev_dbg(hsotg->dev, "%s trying more for req...\n", __func__);
+                s3c_hsotg_start_req(hsotg, hs_ep, hs_req, true);
+        } else
+                s3c_hsotg_complete_request_lock(hsotg, hs_ep, hs_req, 0);
+}
+
+/**
+ * s3c_hsotg_epint - handle an in/out endpoint interrupt
+ * @hsotg: The driver state
+ * @idx: The index for the endpoint (0..15)
+ * @dir_in: Set if this is an IN endpoint
+ *
+ * Process and clear any interrupt pending for an individual endpoint
+*/
+static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx,
+                            int dir_in)
+{
+        struct s3c_hsotg_ep *hs_ep = &hsotg->eps[idx];
+        u32 epint_reg = dir_in ? S3C_DIEPINT(idx) : S3C_DOEPINT(idx);
+        u32 epctl_reg = dir_in ? S3C_DIEPCTL(idx) : S3C_DOEPCTL(idx);
+        u32 epsiz_reg = dir_in ? S3C_DIEPTSIZ(idx) : S3C_DOEPTSIZ(idx);
+        u32 ints;
+        u32 clear = 0;
+
+        ints = readl(hsotg->regs + epint_reg);
+
+        dev_dbg(hsotg->dev, "%s: ep%d(%s) DxEPINT=0x%08x\n",
+                __func__, idx, dir_in ? "in" : "out", ints);
+
+        if (ints & S3C_DxEPINT_XferCompl) {
+                dev_dbg(hsotg->dev,
+                        "%s: XferCompl: DxEPCTL=0x%08x, DxEPTSIZ=%08x\n",
+                        __func__, readl(hsotg->regs + epctl_reg),
+                        readl(hsotg->regs + epsiz_reg));
+
+                /* we get OutDone from the FIFO, so we only need to look
+                 * at completing IN requests here */
+                if (dir_in) {
+                        s3c_hsotg_complete_in(hsotg, hs_ep);
+
+                        if (idx == 0)
+                                s3c_hsotg_enqueue_setup(hsotg);
+                } else if (using_dma(hsotg)) {
+                        /* We're using DMA, we need to fire an OutDone here
+                         * as we ignore the RXFIFO. */
+
+                        s3c_hsotg_handle_outdone(hsotg, idx, false);
+                }
+
+                clear |= S3C_DxEPINT_XferCompl;
+        }
+
+        if (ints & S3C_DxEPINT_EPDisbld) {
+                dev_dbg(hsotg->dev, "%s: EPDisbld\n", __func__);
+                clear |= S3C_DxEPINT_EPDisbld;
+        }
+
+        if (ints & S3C_DxEPINT_AHBErr) {
+                dev_dbg(hsotg->dev, "%s: AHBErr\n", __func__);
+                clear |= S3C_DxEPINT_AHBErr;
+        }
+
+        if (ints & S3C_DxEPINT_Setup) {  /* Setup or Timeout */
+                dev_dbg(hsotg->dev, "%s: Setup/Timeout\n",  __func__);
+
+                if (using_dma(hsotg) && idx == 0) {
+                        /* this is the notification we've received a
+                         * setup packet. In non-DMA mode we'd get this
+                         * from the RXFIFO, instead we need to process
+                         * the setup here. */
+
+                        if (dir_in)
+                                WARN_ON_ONCE(1);
+                        else
+                                s3c_hsotg_handle_outdone(hsotg, 0, true);
+                }
+
+                clear |= S3C_DxEPINT_Setup;
+        }
+
+        if (ints & S3C_DxEPINT_Back2BackSetup) {
+                dev_dbg(hsotg->dev, "%s: B2BSetup/INEPNakEff\n", __func__);
+                clear |= S3C_DxEPINT_Back2BackSetup;
+        }
+
+        if (dir_in) {
+                /* not sure if this is important, but we'll clear it anyway
+                 */
+                if (ints & S3C_DIEPMSK_INTknTXFEmpMsk) {
+                        dev_dbg(hsotg->dev, "%s: ep%d: INTknTXFEmpMsk\n",
+                                __func__, idx);
+                        clear |= S3C_DIEPMSK_INTknTXFEmpMsk;
+                }
+
+                /* this probably means something bad is happening */
+                if (ints & S3C_DIEPMSK_INTknEPMisMsk) {
+                        dev_warn(hsotg->dev, "%s: ep%d: INTknEP\n",
+                                 __func__, idx);
+                        clear |= S3C_DIEPMSK_INTknEPMisMsk;
+                }
+        }
+
+        writel(clear, hsotg->regs + epint_reg);
+}
+
+/**
+ * s3c_hsotg_irq_enumdone - Handle EnumDone interrupt (enumeration done)
+ * @hsotg: The device state.
+ *
+ * Handle updating the device settings after the enumeration phase has
+ * been completed.
+*/
+static void s3c_hsotg_irq_enumdone(struct s3c_hsotg *hsotg)
+{
+        u32 dsts = readl(hsotg->regs + S3C_DSTS);
+        int ep0_mps = 0, ep_mps;
+
+        /* This should signal the finish of the enumeration phase
+         * of the USB handshaking, so we should now know what rate
+         * we connected at. */
+
+        dev_dbg(hsotg->dev, "EnumDone (DSTS=0x%08x)\n", dsts);
+
+        /* note, since we're limited by the size of transfer on EP0, and
+         * it seems IN transfers must be a even number of packets we do
+         * not advertise a 64byte MPS on EP0. */
+
+        /* catch both EnumSpd_FS and EnumSpd_FS48 */
+        switch (dsts & S3C_DSTS_EnumSpd_MASK) {
+        case S3C_DSTS_EnumSpd_FS:
+        case S3C_DSTS_EnumSpd_FS48:
+                hsotg->gadget.speed = USB_SPEED_FULL;
+                dev_info(hsotg->dev, "new device is full-speed\n");
+
+                ep0_mps = EP0_MPS_LIMIT;
+                ep_mps = 64;
+                break;
+
+        case S3C_DSTS_EnumSpd_HS:
+                dev_info(hsotg->dev, "new device is high-speed\n");
+                hsotg->gadget.speed = USB_SPEED_HIGH;
+
+                ep0_mps = EP0_MPS_LIMIT;
+                ep_mps = 512;
+                break;
+
+        case S3C_DSTS_EnumSpd_LS:
+                hsotg->gadget.speed = USB_SPEED_LOW;
+                dev_info(hsotg->dev, "new device is low-speed\n");
+
+                /* note, we don't actually support LS in this driver at the
+                 * moment, and the documentation seems to imply that it isn't
+                 * supported by the PHYs on some of the devices.
+                 */
+                break;
+        }
+
+        /* we should now know the maximum packet size for an
+         * endpoint, so set the endpoints to a default value. */
+
+        if (ep0_mps) {
+                int i;
+                s3c_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps);
+                for (i = 1; i < S3C_HSOTG_EPS; i++)
+                        s3c_hsotg_set_ep_maxpacket(hsotg, i, ep_mps);
+        }
+
+        /* ensure after enumeration our EP0 is active */
+
+        s3c_hsotg_enqueue_setup(hsotg);
+
+        dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
+                readl(hsotg->regs + S3C_DIEPCTL0),
+                readl(hsotg->regs + S3C_DOEPCTL0));
+}
+
+/**
+ * kill_all_requests - remove all requests from the endpoint's queue
+ * @hsotg: The device state.
+ * @ep: The endpoint the requests may be on.
+ * @result: The result code to use.
+ * @force: Force removal of any current requests
+ *
+ * Go through the requests on the given endpoint and mark them
+ * completed with the given result code.
+ */
+static void kill_all_requests(struct s3c_hsotg *hsotg,
+                              struct s3c_hsotg_ep *ep,
+                              int result, bool force)
+{
+        struct s3c_hsotg_req *req, *treq;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ep->lock, flags);
+
+        list_for_each_entry_safe(req, treq, &ep->queue, queue) {
+                /* currently, we can't do much about an already
+                 * running request on an in endpoint */
+
+                if (ep->req == req && ep->dir_in && !force)
+                        continue;
+
+                s3c_hsotg_complete_request(hsotg, ep, req,
+                                           result);
+        }
+
+        spin_unlock_irqrestore(&ep->lock, flags);
+}
+
+#define call_gadget(_hs, _entry) \
+        if ((_hs)->gadget.speed != USB_SPEED_UNKNOWN && \
+            (_hs)->driver && (_hs)->driver->_entry)     \
+                (_hs)->driver->_entry(&(_hs)->gadget);
+
+/**
+ * s3c_hsotg_disconnect_irq - disconnect irq service
+ * @hsotg: The device state.
+ *
+ * A disconnect IRQ has been received, meaning that the host has
+ * lost contact with the bus. Remove all current transactions
+ * and signal the gadget driver that this has happened.
+*/
+static void s3c_hsotg_disconnect_irq(struct s3c_hsotg *hsotg)
+{
+        unsigned ep;
+
+        for (ep = 0; ep < S3C_HSOTG_EPS; ep++)
+                kill_all_requests(hsotg, &hsotg->eps[ep], -ESHUTDOWN, true);
+
+        call_gadget(hsotg, disconnect);
+}
+
+/**
+ * s3c_hsotg_irq_fifoempty - TX FIFO empty interrupt handler
+ * @hsotg: The device state:
+ * @periodic: True if this is a periodic FIFO interrupt
+ */
+static void s3c_hsotg_irq_fifoempty(struct s3c_hsotg *hsotg, bool periodic)
+{
+        struct s3c_hsotg_ep *ep;
+        int epno, ret;
+
+        /* look through for any more data to transmit */
+
+        for (epno = 0; epno < S3C_HSOTG_EPS; epno++) {
+                ep = &hsotg->eps[epno];
+
+                if (!ep->dir_in)
+                        continue;
+
+                if ((periodic && !ep->periodic) ||
+                    (!periodic && ep->periodic))
+                        continue;
+
+                ret = s3c_hsotg_trytx(hsotg, ep);
+                if (ret < 0)
+                        break;
+        }
+}
+
+static struct s3c_hsotg *our_hsotg;
+
+/* IRQ flags which will trigger a retry around the IRQ loop */
+#define IRQ_RETRY_MASK (S3C_GINTSTS_NPTxFEmp | \
+                        S3C_GINTSTS_PTxFEmp |  \
+                        S3C_GINTSTS_RxFLvl)
+
+/**
+ * s3c_hsotg_irq - handle device interrupt
+ * @irq: The IRQ number triggered
+ * @pw: The pw value when registered the handler.
+ */
+static irqreturn_t s3c_hsotg_irq(int irq, void *pw)
+{
+        struct s3c_hsotg *hsotg = pw;
+        int retry_count = 8;
+        u32 gintsts;
+        u32 gintmsk;
+
+irq_retry:
+        gintsts = readl(hsotg->regs + S3C_GINTSTS);
+        gintmsk = readl(hsotg->regs + S3C_GINTMSK);
+
+        dev_dbg(hsotg->dev, "%s: %08x %08x (%08x) retry %d\n",
+                __func__, gintsts, gintsts & gintmsk, gintmsk, retry_count);
+
+        gintsts &= gintmsk;
+
+        if (gintsts & S3C_GINTSTS_OTGInt) {
+                u32 otgint = readl(hsotg->regs + S3C_GOTGINT);
+
+                dev_info(hsotg->dev, "OTGInt: %08x\n", otgint);
+
+                writel(otgint, hsotg->regs + S3C_GOTGINT);
+                writel(S3C_GINTSTS_OTGInt, hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & S3C_GINTSTS_DisconnInt) {
+                dev_dbg(hsotg->dev, "%s: DisconnInt\n", __func__);
+                writel(S3C_GINTSTS_DisconnInt, hsotg->regs + S3C_GINTSTS);
+
+                s3c_hsotg_disconnect_irq(hsotg);
+        }
+
+        if (gintsts & S3C_GINTSTS_SessReqInt) {
+                dev_dbg(hsotg->dev, "%s: SessReqInt\n", __func__);
+                writel(S3C_GINTSTS_SessReqInt, hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & S3C_GINTSTS_EnumDone) {
+                s3c_hsotg_irq_enumdone(hsotg);
+                writel(S3C_GINTSTS_EnumDone, hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & S3C_GINTSTS_ConIDStsChng) {
+                dev_dbg(hsotg->dev, "ConIDStsChg (DSTS=0x%08x, GOTCTL=%08x)\n",
+                        readl(hsotg->regs + S3C_DSTS),
+                        readl(hsotg->regs + S3C_GOTGCTL));
+
+                writel(S3C_GINTSTS_ConIDStsChng, hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & (S3C_GINTSTS_OEPInt | S3C_GINTSTS_IEPInt)) {
+                u32 daint = readl(hsotg->regs + S3C_DAINT);
+                u32 daint_out = daint >> S3C_DAINT_OutEP_SHIFT;
+                u32 daint_in = daint & ~(daint_out << S3C_DAINT_OutEP_SHIFT);
+                int ep;
+
+                dev_dbg(hsotg->dev, "%s: daint=%08x\n", __func__, daint);
+
+                for (ep = 0; ep < 15 && daint_out; ep++, daint_out >>= 1) {
+                        if (daint_out & 1)
+                                s3c_hsotg_epint(hsotg, ep, 0);
+                }
+
+                for (ep = 0; ep < 15 && daint_in; ep++, daint_in >>= 1) {
+                        if (daint_in & 1)
+                                s3c_hsotg_epint(hsotg, ep, 1);
+                }
+
+                writel(daint, hsotg->regs + S3C_DAINT);
+                writel(gintsts & (S3C_GINTSTS_OEPInt | S3C_GINTSTS_IEPInt),
+                       hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & S3C_GINTSTS_USBRst) {
+                dev_info(hsotg->dev, "%s: USBRst\n", __func__);
+                dev_dbg(hsotg->dev, "GNPTXSTS=%08x\n",
+                        readl(hsotg->regs + S3C_GNPTXSTS));
+
+                kill_all_requests(hsotg, &hsotg->eps[0], -ECONNRESET, true);
+
+                /* it seems after a reset we can end up with a situation
+                 * where the TXFIFO still has data in it... try flushing
+                 * it to remove anything that may still be in it.
+                 */
+
+                if (1) {
+                        writel(S3C_GRSTCTL_TxFNum(0) | S3C_GRSTCTL_TxFFlsh,
+                               hsotg->regs + S3C_GRSTCTL);
+
+                        dev_info(hsotg->dev, "GNPTXSTS=%08x\n",
+                                 readl(hsotg->regs + S3C_GNPTXSTS));
+                }
+
+                s3c_hsotg_enqueue_setup(hsotg);
+
+                writel(S3C_GINTSTS_USBRst, hsotg->regs + S3C_GINTSTS);
+        }
+
+        /* check both FIFOs */
+
+        if (gintsts & S3C_GINTSTS_NPTxFEmp) {
+                dev_dbg(hsotg->dev, "NPTxFEmp\n");
+
+                /* Disable the interrupt to stop it happening again
+                 * unless one of these endpoint routines decides that
+                 * it needs re-enabling */
+
+                s3c_hsotg_disable_gsint(hsotg, S3C_GINTSTS_NPTxFEmp);
+                s3c_hsotg_irq_fifoempty(hsotg, false);
+
+                writel(S3C_GINTSTS_NPTxFEmp, hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & S3C_GINTSTS_PTxFEmp) {
+                dev_dbg(hsotg->dev, "PTxFEmp\n");
+
+                /* See note in S3C_GINTSTS_NPTxFEmp */
+
+                s3c_hsotg_disable_gsint(hsotg, S3C_GINTSTS_PTxFEmp);
+                s3c_hsotg_irq_fifoempty(hsotg, true);
+
+                writel(S3C_GINTSTS_PTxFEmp, hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & S3C_GINTSTS_RxFLvl) {
+                /* note, since GINTSTS_RxFLvl doubles as FIFO-not-empty,
+                 * we need to retry s3c_hsotg_handle_rx if this is still
+                 * set. */
+
+                s3c_hsotg_handle_rx(hsotg);
+                writel(S3C_GINTSTS_RxFLvl, hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & S3C_GINTSTS_ModeMis) {
+                dev_warn(hsotg->dev, "warning, mode mismatch triggered\n");
+                writel(S3C_GINTSTS_ModeMis, hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & S3C_GINTSTS_USBSusp) {
+                dev_info(hsotg->dev, "S3C_GINTSTS_USBSusp\n");
+                writel(S3C_GINTSTS_USBSusp, hsotg->regs + S3C_GINTSTS);
+
+                call_gadget(hsotg, suspend);
+        }
+
+        if (gintsts & S3C_GINTSTS_WkUpInt) {
+                dev_info(hsotg->dev, "S3C_GINTSTS_WkUpIn\n");
+                writel(S3C_GINTSTS_WkUpInt, hsotg->regs + S3C_GINTSTS);
+
+                call_gadget(hsotg, resume);
+        }
+
+        if (gintsts & S3C_GINTSTS_ErlySusp) {
+                dev_dbg(hsotg->dev, "S3C_GINTSTS_ErlySusp\n");
+                writel(S3C_GINTSTS_ErlySusp, hsotg->regs + S3C_GINTSTS);
+        }
+
+        /* these next two seem to crop-up occasionally causing the core
+         * to shutdown the USB transfer, so try clearing them and logging
+         * the occurence. */
+
+        if (gintsts & S3C_GINTSTS_GOUTNakEff) {
+                dev_info(hsotg->dev, "GOUTNakEff triggered\n");
+
+                s3c_hsotg_dump(hsotg);
+
+                writel(S3C_DCTL_CGOUTNak, hsotg->regs + S3C_DCTL);
+                writel(S3C_GINTSTS_GOUTNakEff, hsotg->regs + S3C_GINTSTS);
+        }
+
+        if (gintsts & S3C_GINTSTS_GINNakEff) {
+                dev_info(hsotg->dev, "GINNakEff triggered\n");
+
+                s3c_hsotg_dump(hsotg);
+
+                writel(S3C_DCTL_CGNPInNAK, hsotg->regs + S3C_DCTL);
+                writel(S3C_GINTSTS_GINNakEff, hsotg->regs + S3C_GINTSTS);
+        }
+
+        /* if we've had fifo events, we should try and go around the
+         * loop again to see if there's any point in returning yet. */
+
+        if (gintsts & IRQ_RETRY_MASK && --retry_count > 0)
+                        goto irq_retry;
+
+        return IRQ_HANDLED;
+}
+
+/**
+ * s3c_hsotg_ep_enable - enable the given endpoint
+ * @ep: The USB endpint to configure
+ * @desc: The USB endpoint descriptor to configure with.
+ *
+ * This is called from the USB gadget code's usb_ep_enable().
+*/
+static int s3c_hsotg_ep_enable(struct usb_ep *ep,
+                               const struct usb_endpoint_descriptor *desc)
+{
+        struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+        struct s3c_hsotg *hsotg = hs_ep->parent;
+        unsigned long flags;
+        int index = hs_ep->index;
+        u32 epctrl_reg;
+        u32 epctrl;
+        u32 mps;
+        int dir_in;
+
+        dev_dbg(hsotg->dev,
+                "%s: ep %s: a 0x%02x, attr 0x%02x, mps 0x%04x, intr %d\n",
+                __func__, ep->name, desc->bEndpointAddress, desc->bmAttributes,
+                desc->wMaxPacketSize, desc->bInterval);
+
+        /* not to be called for EP0 */
+        WARN_ON(index == 0);
+
+        dir_in = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? 1 : 0;
+        if (dir_in != hs_ep->dir_in) {
+                dev_err(hsotg->dev, "%s: direction mismatch!\n", __func__);
+                return -EINVAL;
+        }
+
+        mps = le16_to_cpu(desc->wMaxPacketSize);
+
+        /* note, we handle this here instead of s3c_hsotg_set_ep_maxpacket */
+
+        epctrl_reg = dir_in ? S3C_DIEPCTL(index) : S3C_DOEPCTL(index);
+        epctrl = readl(hsotg->regs + epctrl_reg);
+
+        dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x from 0x%08x\n",
+                __func__, epctrl, epctrl_reg);
+
+        spin_lock_irqsave(&hs_ep->lock, flags);
+
+        epctrl &= ~(S3C_DxEPCTL_EPType_MASK | S3C_DxEPCTL_MPS_MASK);
+        epctrl |= S3C_DxEPCTL_MPS(mps);
+
+        /* mark the endpoint as active, otherwise the core may ignore
+         * transactions entirely for this endpoint */
+        epctrl |= S3C_DxEPCTL_USBActEp;
+
+        /* set the NAK status on the endpoint, otherwise we might try and
+         * do something with data that we've yet got a request to process
+         * since the RXFIFO will take data for an endpoint even if the
+         * size register hasn't been set.
+         */
+
+        epctrl |= S3C_DxEPCTL_SNAK;
+
+        /* update the endpoint state */
+        hs_ep->ep.maxpacket = mps;
+
+        /* default, set to non-periodic */
+        hs_ep->periodic = 0;
+
+        switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+        case USB_ENDPOINT_XFER_ISOC:
+                dev_err(hsotg->dev, "no current ISOC support\n");
+                return -EINVAL;
+
+        case USB_ENDPOINT_XFER_BULK:
+                epctrl |= S3C_DxEPCTL_EPType_Bulk;
+                break;
+
+        case USB_ENDPOINT_XFER_INT:
+                if (dir_in) {
+                        /* Allocate our TxFNum by simply using the index
+                         * of the endpoint for the moment. We could do
+                         * something better if the host indicates how
+                         * many FIFOs we are expecting to use. */
+
+                        hs_ep->periodic = 1;
+                        epctrl |= S3C_DxEPCTL_TxFNum(index);
+                }
+
+                epctrl |= S3C_DxEPCTL_EPType_Intterupt;
+                break;
+
+        case USB_ENDPOINT_XFER_CONTROL:
+                epctrl |= S3C_DxEPCTL_EPType_Control;
+                break;
+        }
+
+        /* for non control endpoints, set PID to D0 */
+        if (index)
+                epctrl |= S3C_DxEPCTL_SetD0PID;
+
+        dev_dbg(hsotg->dev, "%s: write DxEPCTL=0x%08x\n",
+                __func__, epctrl);
+
+        writel(epctrl, hsotg->regs + epctrl_reg);
+        dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x\n",
+                __func__, readl(hsotg->regs + epctrl_reg));
+
+        /* enable the endpoint interrupt */
+        s3c_hsotg_ctrl_epint(hsotg, index, dir_in, 1);
+
+        spin_unlock_irqrestore(&hs_ep->lock, flags);
+        return 0;
+}
+
+static int s3c_hsotg_ep_disable(struct usb_ep *ep)
+{
+        struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+        struct s3c_hsotg *hsotg = hs_ep->parent;
+        int dir_in = hs_ep->dir_in;
+        int index = hs_ep->index;
+        unsigned long flags;
+        u32 epctrl_reg;
+        u32 ctrl;
+
+        dev_info(hsotg->dev, "%s(ep %p)\n", __func__, ep);
+
+        if (ep == &hsotg->eps[0].ep) {
+                dev_err(hsotg->dev, "%s: called for ep0\n", __func__);
+                return -EINVAL;
+        }
+
+        epctrl_reg = dir_in ? S3C_DIEPCTL(index) : S3C_DOEPCTL(index);
+
+        /* terminate all requests with shutdown */
+        kill_all_requests(hsotg, hs_ep, -ESHUTDOWN, false);
+
+        spin_lock_irqsave(&hs_ep->lock, flags);
+
+        ctrl = readl(hsotg->regs + epctrl_reg);
+        ctrl &= ~S3C_DxEPCTL_EPEna;
+        ctrl &= ~S3C_DxEPCTL_USBActEp;
+        ctrl |= S3C_DxEPCTL_SNAK;
+
+        dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl);
+        writel(ctrl, hsotg->regs + epctrl_reg);
+
+        /* disable endpoint interrupts */
+        s3c_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 0);
+
+        spin_unlock_irqrestore(&hs_ep->lock, flags);
+        return 0;
+}
+
+/**
+ * on_list - check request is on the given endpoint
+ * @ep: The endpoint to check.
+ * @test: The request to test if it is on the endpoint.
+*/
+static bool on_list(struct s3c_hsotg_ep *ep, struct s3c_hsotg_req *test)
+{
+        struct s3c_hsotg_req *req, *treq;
+
+        list_for_each_entry_safe(req, treq, &ep->queue, queue) {
+                if (req == test)
+                        return true;
+        }
+
+        return false;
+}
+
+static int s3c_hsotg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
+{
+        struct s3c_hsotg_req *hs_req = our_req(req);
+        struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+        struct s3c_hsotg *hs = hs_ep->parent;
+        unsigned long flags;
+
+        dev_info(hs->dev, "ep_dequeue(%p,%p)\n", ep, req);
+
+        if (hs_req == hs_ep->req) {
+                dev_dbg(hs->dev, "%s: already in progress\n", __func__);
+                return -EINPROGRESS;
+        }
+
+        spin_lock_irqsave(&hs_ep->lock, flags);
+
+        if (!on_list(hs_ep, hs_req)) {
+                spin_unlock_irqrestore(&hs_ep->lock, flags);
+                return -EINVAL;
+        }
+
+        s3c_hsotg_complete_request(hs, hs_ep, hs_req, -ECONNRESET);
+        spin_unlock_irqrestore(&hs_ep->lock, flags);
+
+        return 0;
+}
+
+static int s3c_hsotg_ep_sethalt(struct usb_ep *ep, int value)
+{
+        struct s3c_hsotg_ep *hs_ep = our_ep(ep);
+        struct s3c_hsotg *hs = hs_ep->parent;
+        int index = hs_ep->index;
+        unsigned long irqflags;
+        u32 epreg;
+        u32 epctl;
+
+        dev_info(hs->dev, "%s(ep %p %s, %d)\n", __func__, ep, ep->name, value);
+
+        spin_lock_irqsave(&hs_ep->lock, irqflags);
+
+        /* write both IN and OUT control registers */
+
+        epreg = S3C_DIEPCTL(index);
+        epctl = readl(hs->regs + epreg);
+
+        if (value)
+                epctl |= S3C_DxEPCTL_Stall;
+        else
+                epctl &= ~S3C_DxEPCTL_Stall;
+
+        writel(epctl, hs->regs + epreg);
+
+        epreg = S3C_DOEPCTL(index);
+        epctl = readl(hs->regs + epreg);
+
+        if (value)
+                epctl |= S3C_DxEPCTL_Stall;
+        else
+                epctl &= ~S3C_DxEPCTL_Stall;
+
+        writel(epctl, hs->regs + epreg);
+
+        spin_unlock_irqrestore(&hs_ep->lock, irqflags);
+
+        return 0;
+}
+
+static struct usb_ep_ops s3c_hsotg_ep_ops = {
+        .enable         = s3c_hsotg_ep_enable,
+        .disable        = s3c_hsotg_ep_disable,
+        .alloc_request  = s3c_hsotg_ep_alloc_request,
+        .free_request   = s3c_hsotg_ep_free_request,
+        .queue          = s3c_hsotg_ep_queue,
+        .dequeue        = s3c_hsotg_ep_dequeue,
+        .set_halt       = s3c_hsotg_ep_sethalt,
+        /* note, don't belive we have any call for the fifo routines */
+};
+
+/**
+ * s3c_hsotg_corereset - issue softreset to the core
+ * @hsotg: The device state
+ *
+ * Issue a soft reset to the core, and await the core finishing it.
+*/
+static int s3c_hsotg_corereset(struct s3c_hsotg *hsotg)
+{
+        int timeout;
+        u32 grstctl;
+
+        dev_dbg(hsotg->dev, "resetting core\n");
+
+        /* issue soft reset */
+        writel(S3C_GRSTCTL_CSftRst, hsotg->regs + S3C_GRSTCTL);
+
+        timeout = 1000;
+        do {
+                grstctl = readl(hsotg->regs + S3C_GRSTCTL);
+        } while (!(grstctl & S3C_GRSTCTL_CSftRst) && timeout-- > 0);
+
+        if (!grstctl & S3C_GRSTCTL_CSftRst) {
+                dev_err(hsotg->dev, "Failed to get CSftRst asserted\n");
+                return -EINVAL;
+        }
+
+        timeout = 1000;
+
+        while (1) {
+                u32 grstctl = readl(hsotg->regs + S3C_GRSTCTL);
+
+                if (timeout-- < 0) {
+                        dev_info(hsotg->dev,
+                                 "%s: reset failed, GRSTCTL=%08x\n",
+                                 __func__, grstctl);
+                        return -ETIMEDOUT;
+                }
+
+                if (grstctl & S3C_GRSTCTL_CSftRst)
+                        continue;
+
+                if (!(grstctl & S3C_GRSTCTL_AHBIdle))
+                        continue;
+
+                break;          /* reset done */
+        }
+
+        dev_dbg(hsotg->dev, "reset successful\n");
+        return 0;
+}
+
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+        struct s3c_hsotg *hsotg = our_hsotg;
+        int ret;
+
+        if (!hsotg) {
+                printk(KERN_ERR "%s: called with no device\n", __func__);
+                return -ENODEV;
+        }
+
+        if (!driver) {
+                dev_err(hsotg->dev, "%s: no driver\n", __func__);
+                return -EINVAL;
+        }
+
+        if (driver->speed != USB_SPEED_HIGH &&
+            driver->speed != USB_SPEED_FULL) {
+                dev_err(hsotg->dev, "%s: bad speed\n", __func__);
+        }
+
+        if (!driver->bind || !driver->setup) {
+                dev_err(hsotg->dev, "%s: missing entry points\n", __func__);
+                return -EINVAL;
+        }
+
+        WARN_ON(hsotg->driver);
+
+        driver->driver.bus = NULL;
+        hsotg->driver = driver;
+        hsotg->gadget.dev.driver = &driver->driver;
+        hsotg->gadget.dev.dma_mask = hsotg->dev->dma_mask;
+        hsotg->gadget.speed = USB_SPEED_UNKNOWN;
+
+        ret = device_add(&hsotg->gadget.dev);
+        if (ret) {
+                dev_err(hsotg->dev, "failed to register gadget device\n");
+                goto err;
+        }
+
+        ret = driver->bind(&hsotg->gadget);
+        if (ret) {
+                dev_err(hsotg->dev, "failed bind %s\n", driver->driver.name);
+
+                hsotg->gadget.dev.driver = NULL;
+                hsotg->driver = NULL;
+                goto err;
+        }
+
+        /* we must now enable ep0 ready for host detection and then
+         * set configuration. */
+
+        s3c_hsotg_corereset(hsotg);
+
+        /* set the PLL on, remove the HNP/SRP and set the PHY */
+        writel(S3C_GUSBCFG_PHYIf16 | S3C_GUSBCFG_TOutCal(7) |
+               (0x5 << 10), hsotg->regs + S3C_GUSBCFG);
+
+        /* looks like soft-reset changes state of FIFOs */
+        s3c_hsotg_init_fifo(hsotg);
+
+        __orr32(hsotg->regs + S3C_DCTL, S3C_DCTL_SftDiscon);
+
+        writel(1 << 18 | S3C_DCFG_DevSpd_HS,  hsotg->regs + S3C_DCFG);
+
+        writel(S3C_GINTSTS_DisconnInt | S3C_GINTSTS_SessReqInt |
+               S3C_GINTSTS_ConIDStsChng | S3C_GINTSTS_USBRst |
+               S3C_GINTSTS_EnumDone | S3C_GINTSTS_OTGInt |
+               S3C_GINTSTS_USBSusp | S3C_GINTSTS_WkUpInt |
+               S3C_GINTSTS_GOUTNakEff | S3C_GINTSTS_GINNakEff |
+               S3C_GINTSTS_ErlySusp,
+               hsotg->regs + S3C_GINTMSK);
+
+        if (using_dma(hsotg))
+                writel(S3C_GAHBCFG_GlblIntrEn | S3C_GAHBCFG_DMAEn |
+                       S3C_GAHBCFG_HBstLen_Incr4,
+                       hsotg->regs + S3C_GAHBCFG);
+        else
+                writel(S3C_GAHBCFG_GlblIntrEn, hsotg->regs + S3C_GAHBCFG);
+
+        /* Enabling INTknTXFEmpMsk here seems to be a big mistake, we end
+         * up being flooded with interrupts if the host is polling the
+         * endpoint to try and read data. */
+
+        writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk |
+               S3C_DIEPMSK_INTknEPMisMsk |
+               S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk,
+               hsotg->regs + S3C_DIEPMSK);
+
+        /* don't need XferCompl, we get that from RXFIFO in slave mode. In
+         * DMA mode we may need this. */
+        writel(S3C_DOEPMSK_SetupMsk | S3C_DOEPMSK_AHBErrMsk |
+               S3C_DOEPMSK_EPDisbldMsk |
+               using_dma(hsotg) ? (S3C_DIEPMSK_XferComplMsk |
+                                   S3C_DIEPMSK_TimeOUTMsk) : 0,
+               hsotg->regs + S3C_DOEPMSK);
+
+        writel(0, hsotg->regs + S3C_DAINTMSK);
+
+        dev_info(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
+                 readl(hsotg->regs + S3C_DIEPCTL0),
+                 readl(hsotg->regs + S3C_DOEPCTL0));
+
+        /* enable in and out endpoint interrupts */
+        s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_OEPInt | S3C_GINTSTS_IEPInt);
+
+        /* Enable the RXFIFO when in slave mode, as this is how we collect
+         * the data. In DMA mode, we get events from the FIFO but also
+         * things we cannot process, so do not use it. */
+        if (!using_dma(hsotg))
+                s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_RxFLvl);
+
+        /* Enable interrupts for EP0 in and out */
+        s3c_hsotg_ctrl_epint(hsotg, 0, 0, 1);
+        s3c_hsotg_ctrl_epint(hsotg, 0, 1, 1);
+
+        __orr32(hsotg->regs + S3C_DCTL, S3C_DCTL_PWROnPrgDone);
+        udelay(10);  /* see openiboot */
+        __bic32(hsotg->regs + S3C_DCTL, S3C_DCTL_PWROnPrgDone);
+
+        dev_info(hsotg->dev, "DCTL=0x%08x\n", readl(hsotg->regs + S3C_DCTL));
+
+        /* S3C_DxEPCTL_USBActEp says RO in manual, but seems to be set by
+           writing to the EPCTL register.. */
+
+        /* set to read 1 8byte packet */
+        writel(S3C_DxEPTSIZ_MC(1) | S3C_DxEPTSIZ_PktCnt(1) |
+               S3C_DxEPTSIZ_XferSize(8), hsotg->regs + DOEPTSIZ0);
+
+        writel(s3c_hsotg_ep0_mps(hsotg->eps[0].ep.maxpacket) |
+               S3C_DxEPCTL_CNAK | S3C_DxEPCTL_EPEna |
+               S3C_DxEPCTL_USBActEp,
+               hsotg->regs + S3C_DOEPCTL0);
+
+        /* enable, but don't activate EP0in */
+        writel(s3c_hsotg_ep0_mps(hsotg->eps[0].ep.maxpacket) |
+               S3C_DxEPCTL_USBActEp, hsotg->regs + S3C_DIEPCTL0);
+
+        s3c_hsotg_enqueue_setup(hsotg);
+
+        dev_info(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n",
+                 readl(hsotg->regs + S3C_DIEPCTL0),
+                 readl(hsotg->regs + S3C_DOEPCTL0));
+
+        /* clear global NAKs */
+        writel(S3C_DCTL_CGOUTNak | S3C_DCTL_CGNPInNAK,
+               hsotg->regs + S3C_DCTL);
+
+        /* remove the soft-disconnect and let's go */
+        __bic32(hsotg->regs + S3C_DCTL, S3C_DCTL_SftDiscon);
+
+        /* report to the user, and return */
+
+        dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name);
+        return 0;
+
+err:
+        hsotg->driver = NULL;
+        hsotg->gadget.dev.driver = NULL;
+        return ret;
+}
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+        struct s3c_hsotg *hsotg = our_hsotg;
+        int ep;
+
+        if (!hsotg)
+                return -ENODEV;
+
+        if (!driver || driver != hsotg->driver || !driver->unbind)
+                return -EINVAL;
+
+        /* all endpoints should be shutdown */
+        for (ep = 0; ep < S3C_HSOTG_EPS; ep++)
+                s3c_hsotg_ep_disable(&hsotg->eps[ep].ep);
+
+        call_gadget(hsotg, disconnect);
+
+        driver->unbind(&hsotg->gadget);
+        hsotg->driver = NULL;
+        hsotg->gadget.speed = USB_SPEED_UNKNOWN;
+
+        device_del(&hsotg->gadget.dev);
+
+        dev_info(hsotg->dev, "unregistered gadget driver '%s'\n",
+                 driver->driver.name);
+
+        return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+static int s3c_hsotg_gadget_getframe(struct usb_gadget *gadget)
+{
+        return s3c_hsotg_read_frameno(to_hsotg(gadget));
+}
+
+static struct usb_gadget_ops s3c_hsotg_gadget_ops = {
+        .get_frame      = s3c_hsotg_gadget_getframe,
+};
+
+/**
+ * s3c_hsotg_initep - initialise a single endpoint
+ * @hsotg: The device state.
+ * @hs_ep: The endpoint to be initialised.
+ * @epnum: The endpoint number
+ *
+ * Initialise the given endpoint (as part of the probe and device state
+ * creation) to give to the gadget driver. Setup the endpoint name, any
+ * direction information and other state that may be required.
+ */
+static void __devinit s3c_hsotg_initep(struct s3c_hsotg *hsotg,
+                                       struct s3c_hsotg_ep *hs_ep,
+                                       int epnum)
+{
+        u32 ptxfifo;
+        char *dir;
+
+        if (epnum == 0)
+                dir = "";
+        else if ((epnum % 2) == 0) {
+                dir = "out";
+        } else {
+                dir = "in";
+                hs_ep->dir_in = 1;
+        }
+
+        hs_ep->index = epnum;
+
+        snprintf(hs_ep->name, sizeof(hs_ep->name), "ep%d%s", epnum, dir);
+
+        INIT_LIST_HEAD(&hs_ep->queue);
+        INIT_LIST_HEAD(&hs_ep->ep.ep_list);
+
+        spin_lock_init(&hs_ep->lock);
+
+        /* add to the list of endpoints known by the gadget driver */
+        if (epnum)
+                list_add_tail(&hs_ep->ep.ep_list, &hsotg->gadget.ep_list);
+
+        hs_ep->parent = hsotg;
+        hs_ep->ep.name = hs_ep->name;
+        hs_ep->ep.maxpacket = epnum ? 512 : EP0_MPS_LIMIT;
+        hs_ep->ep.ops = &s3c_hsotg_ep_ops;
+
+        /* Read the FIFO size for the Periodic TX FIFO, even if we're
+         * an OUT endpoint, we may as well do this if in future the
+         * code is changed to make each endpoint's direction changeable.
+         */
+
+        ptxfifo = readl(hsotg->regs + S3C_DPTXFSIZn(epnum));
+        hs_ep->fifo_size = S3C_DPTXFSIZn_DPTxFSize_GET(ptxfifo);
+
+        /* if we're using dma, we need to set the next-endpoint pointer
+         * to be something valid.
+         */
+
+        if (using_dma(hsotg)) {
+                u32 next = S3C_DxEPCTL_NextEp((epnum + 1) % 15);
+                writel(next, hsotg->regs + S3C_DIEPCTL(epnum));
+                writel(next, hsotg->regs + S3C_DOEPCTL(epnum));
+        }
+}
+
+/**
+ * s3c_hsotg_otgreset - reset the OtG phy block
+ * @hsotg: The host state.
+ *
+ * Power up the phy, set the basic configuration and start the PHY.
+ */
+static void s3c_hsotg_otgreset(struct s3c_hsotg *hsotg)
+{
+        u32 osc;
+
+        writel(0, S3C_PHYPWR);
+        mdelay(1);
+
+        osc = hsotg->plat->is_osc ? S3C_PHYCLK_EXT_OSC : 0;
+
+        writel(osc | 0x10, S3C_PHYCLK);
+
+        /* issue a full set of resets to the otg and core */
+
+        writel(S3C_RSTCON_PHY, S3C_RSTCON);
+        udelay(20);     /* at-least 10uS */
+        writel(0, S3C_RSTCON);
+}
+
+
+static void s3c_hsotg_init(struct s3c_hsotg *hsotg)
+{
+        /* unmask subset of endpoint interrupts */
+
+        writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk |
+               S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk,
+               hsotg->regs + S3C_DIEPMSK);
+
+        writel(S3C_DOEPMSK_SetupMsk | S3C_DOEPMSK_AHBErrMsk |
+               S3C_DOEPMSK_EPDisbldMsk | S3C_DOEPMSK_XferComplMsk,
+               hsotg->regs + S3C_DOEPMSK);
+
+        writel(0, hsotg->regs + S3C_DAINTMSK);
+
+        if (0) {
+                /* post global nak until we're ready */
+                writel(S3C_DCTL_SGNPInNAK | S3C_DCTL_SGOUTNak,
+                       hsotg->regs + S3C_DCTL);
+        }
+
+        /* setup fifos */
+
+        dev_info(hsotg->dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n",
+                 readl(hsotg->regs + S3C_GRXFSIZ),
+                 readl(hsotg->regs + S3C_GNPTXFSIZ));
+
+        s3c_hsotg_init_fifo(hsotg);
+
+        /* set the PLL on, remove the HNP/SRP and set the PHY */
+        writel(S3C_GUSBCFG_PHYIf16 | S3C_GUSBCFG_TOutCal(7) | (0x5 << 10),
+               hsotg->regs + S3C_GUSBCFG);
+
+        writel(using_dma(hsotg) ? S3C_GAHBCFG_DMAEn : 0x0,
+               hsotg->regs + S3C_GAHBCFG);
+}
+
+static void s3c_hsotg_dump(struct s3c_hsotg *hsotg)
+{
+        struct device *dev = hsotg->dev;
+        void __iomem *regs = hsotg->regs;
+        u32 val;
+        int idx;
+
+        dev_info(dev, "DCFG=0x%08x, DCTL=0x%08x, DIEPMSK=%08x\n",
+                 readl(regs + S3C_DCFG), readl(regs + S3C_DCTL),
+                 readl(regs + S3C_DIEPMSK));
+
+        dev_info(dev, "GAHBCFG=0x%08x, 0x44=0x%08x\n",
+                 readl(regs + S3C_GAHBCFG), readl(regs + 0x44));
+
+        dev_info(dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n",
+                 readl(regs + S3C_GRXFSIZ), readl(regs + S3C_GNPTXFSIZ));
+
+        /* show periodic fifo settings */
+
+        for (idx = 1; idx <= 15; idx++) {
+                val = readl(regs + S3C_DPTXFSIZn(idx));
+                dev_info(dev, "DPTx[%d] FSize=%d, StAddr=0x%08x\n", idx,
+                         val >> S3C_DPTXFSIZn_DPTxFSize_SHIFT,
+                         val & S3C_DPTXFSIZn_DPTxFStAddr_MASK);
+        }
+
+        for (idx = 0; idx < 15; idx++) {
+                dev_info(dev,
+                         "ep%d-in: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", idx,
+                         readl(regs + S3C_DIEPCTL(idx)),
+                         readl(regs + S3C_DIEPTSIZ(idx)),
+                         readl(regs + S3C_DIEPDMA(idx)));
+
+                val = readl(regs + S3C_DOEPCTL(idx));
+                dev_info(dev,
+                         "ep%d-out: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n",
+                         idx, readl(regs + S3C_DOEPCTL(idx)),
+                         readl(regs + S3C_DOEPTSIZ(idx)),
+                         readl(regs + S3C_DOEPDMA(idx)));
+
+        }
+
+        dev_info(dev, "DVBUSDIS=0x%08x, DVBUSPULSE=%08x\n",
+                 readl(regs + S3C_DVBUSDIS), readl(regs + S3C_DVBUSPULSE));
+}
+
+
+/**
+ * state_show - debugfs: show overall driver and device state.
+ * @seq: The seq file to write to.
+ * @v: Unused parameter.
+ *
+ * This debugfs entry shows the overall state of the hardware and
+ * some general information about each of the endpoints available
+ * to the system.
+ */
+static int state_show(struct seq_file *seq, void *v)
+{
+        struct s3c_hsotg *hsotg = seq->private;
+        void __iomem *regs = hsotg->regs;
+        int idx;
+
+        seq_printf(seq, "DCFG=0x%08x, DCTL=0x%08x, DSTS=0x%08x\n",
+                 readl(regs + S3C_DCFG),
+                 readl(regs + S3C_DCTL),
+                 readl(regs + S3C_DSTS));
+
+        seq_printf(seq, "DIEPMSK=0x%08x, DOEPMASK=0x%08x\n",
+                   readl(regs + S3C_DIEPMSK), readl(regs + S3C_DOEPMSK));
+
+        seq_printf(seq, "GINTMSK=0x%08x, GINTSTS=0x%08x\n",
+                   readl(regs + S3C_GINTMSK),
+                   readl(regs + S3C_GINTSTS));
+
+        seq_printf(seq, "DAINTMSK=0x%08x, DAINT=0x%08x\n",
+                   readl(regs + S3C_DAINTMSK),
+                   readl(regs + S3C_DAINT));
+
+        seq_printf(seq, "GNPTXSTS=0x%08x, GRXSTSR=%08x\n",
+                   readl(regs + S3C_GNPTXSTS),
+                   readl(regs + S3C_GRXSTSR));
+
+        seq_printf(seq, "\nEndpoint status:\n");
+
+        for (idx = 0; idx < 15; idx++) {
+                u32 in, out;
+
+                in = readl(regs + S3C_DIEPCTL(idx));
+                out = readl(regs + S3C_DOEPCTL(idx));
+
+                seq_printf(seq, "ep%d: DIEPCTL=0x%08x, DOEPCTL=0x%08x",
+                           idx, in, out);
+
+                in = readl(regs + S3C_DIEPTSIZ(idx));
+                out = readl(regs + S3C_DOEPTSIZ(idx));
+
+                seq_printf(seq, ", DIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x",
+                           in, out);
+
+                seq_printf(seq, "\n");
+        }
+
+        return 0;
+}
+
+static int state_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, state_show, inode->i_private);
+}
+
+static const struct file_operations state_fops = {
+        .owner          = THIS_MODULE,
+        .open           = state_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+/**
+ * fifo_show - debugfs: show the fifo information
+ * @seq: The seq_file to write data to.
+ * @v: Unused parameter.
+ *
+ * Show the FIFO information for the overall fifo and all the
+ * periodic transmission FIFOs.
+*/
+static int fifo_show(struct seq_file *seq, void *v)
+{
+        struct s3c_hsotg *hsotg = seq->private;
+        void __iomem *regs = hsotg->regs;
+        u32 val;
+        int idx;
+
+        seq_printf(seq, "Non-periodic FIFOs:\n");
+        seq_printf(seq, "RXFIFO: Size %d\n", readl(regs + S3C_GRXFSIZ));
+
+        val = readl(regs + S3C_GNPTXFSIZ);
+        seq_printf(seq, "NPTXFIFO: Size %d, Start 0x%08x\n",
+                   val >> S3C_GNPTXFSIZ_NPTxFDep_SHIFT,
+                   val & S3C_GNPTXFSIZ_NPTxFStAddr_MASK);
+
+        seq_printf(seq, "\nPeriodic TXFIFOs:\n");
+
+        for (idx = 1; idx <= 15; idx++) {
+                val = readl(regs + S3C_DPTXFSIZn(idx));
+
+                seq_printf(seq, "\tDPTXFIFO%2d: Size %d, Start 0x%08x\n", idx,
+                           val >> S3C_DPTXFSIZn_DPTxFSize_SHIFT,
+                           val & S3C_DPTXFSIZn_DPTxFStAddr_MASK);
+        }
+
+        return 0;
+}
+
+static int fifo_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, fifo_show, inode->i_private);
+}
+
+static const struct file_operations fifo_fops = {
+        .owner          = THIS_MODULE,
+        .open           = fifo_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+
+static const char *decode_direction(int is_in)
+{
+        return is_in ? "in" : "out";
+}
+
+/**
+ * ep_show - debugfs: show the state of an endpoint.
+ * @seq: The seq_file to write data to.
+ * @v: Unused parameter.
+ *
+ * This debugfs entry shows the state of the given endpoint (one is
+ * registered for each available).
+*/
+static int ep_show(struct seq_file *seq, void *v)
+{
+        struct s3c_hsotg_ep *ep = seq->private;
+        struct s3c_hsotg *hsotg = ep->parent;
+        struct s3c_hsotg_req *req;
+        void __iomem *regs = hsotg->regs;
+        int index = ep->index;
+        int show_limit = 15;
+        unsigned long flags;
+
+        seq_printf(seq, "Endpoint index %d, named %s,  dir %s:\n",
+                   ep->index, ep->ep.name, decode_direction(ep->dir_in));
+
+        /* first show the register state */
+
+        seq_printf(seq, "\tDIEPCTL=0x%08x, DOEPCTL=0x%08x\n",
+                   readl(regs + S3C_DIEPCTL(index)),
+                   readl(regs + S3C_DOEPCTL(index)));
+
+        seq_printf(seq, "\tDIEPDMA=0x%08x, DOEPDMA=0x%08x\n",
+                   readl(regs + S3C_DIEPDMA(index)),
+                   readl(regs + S3C_DOEPDMA(index)));
+
+        seq_printf(seq, "\tDIEPINT=0x%08x, DOEPINT=0x%08x\n",
+                   readl(regs + S3C_DIEPINT(index)),
+                   readl(regs + S3C_DOEPINT(index)));
+
+        seq_printf(seq, "\tDIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x\n",
+                   readl(regs + S3C_DIEPTSIZ(index)),
+                   readl(regs + S3C_DOEPTSIZ(index)));
+
+        seq_printf(seq, "\n");
+        seq_printf(seq, "mps %d\n", ep->ep.maxpacket);
+        seq_printf(seq, "total_data=%ld\n", ep->total_data);
+
+        seq_printf(seq, "request list (%p,%p):\n",
+                   ep->queue.next, ep->queue.prev);
+
+        spin_lock_irqsave(&ep->lock, flags);
+
+        list_for_each_entry(req, &ep->queue, queue) {
+                if (--show_limit < 0) {
+                        seq_printf(seq, "not showing more requests...\n");
+                        break;
+                }
+
+                seq_printf(seq, "%c req %p: %d bytes @%p, ",
+                           req == ep->req ? '*' : ' ',
+                           req, req->req.length, req->req.buf);
+                seq_printf(seq, "%d done, res %d\n",
+                           req->req.actual, req->req.status);
+        }
+
+        spin_unlock_irqrestore(&ep->lock, flags);
+
+        return 0;
+}
+
+static int ep_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, ep_show, inode->i_private);
+}
+
+static const struct file_operations ep_fops = {
+        .owner          = THIS_MODULE,
+        .open           = ep_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+/**
+ * s3c_hsotg_create_debug - create debugfs directory and files
+ * @hsotg: The driver state
+ *
+ * Create the debugfs files to allow the user to get information
+ * about the state of the system. The directory name is created
+ * with the same name as the device itself, in case we end up
+ * with multiple blocks in future systems.
+*/
+static void __devinit s3c_hsotg_create_debug(struct s3c_hsotg *hsotg)
+{
+        struct dentry *root;
+        unsigned epidx;
+
+        root = debugfs_create_dir(dev_name(hsotg->dev), NULL);
+        hsotg->debug_root = root;
+        if (IS_ERR(root)) {
+                dev_err(hsotg->dev, "cannot create debug root\n");
+                return;
+        }
+
+        /* create general state file */
+
+        hsotg->debug_file = debugfs_create_file("state", 0444, root,
+                                                hsotg, &state_fops);
+
+        if (IS_ERR(hsotg->debug_file))
+                dev_err(hsotg->dev, "%s: failed to create state\n", __func__);
+
+        hsotg->debug_fifo = debugfs_create_file("fifo", 0444, root,
+                                                hsotg, &fifo_fops);
+
+        if (IS_ERR(hsotg->debug_fifo))
+                dev_err(hsotg->dev, "%s: failed to create fifo\n", __func__);
+
+        /* create one file for each endpoint */
+
+        for (epidx = 0; epidx < S3C_HSOTG_EPS; epidx++) {
+                struct s3c_hsotg_ep *ep = &hsotg->eps[epidx];
+
+                ep->debugfs = debugfs_create_file(ep->name, 0444,
+                                                  root, ep, &ep_fops);
+
+                if (IS_ERR(ep->debugfs))
+                        dev_err(hsotg->dev, "failed to create %s debug file\n",
+                                ep->name);
+        }
+}
+
+/**
+ * s3c_hsotg_delete_debug - cleanup debugfs entries
+ * @hsotg: The driver state
+ *
+ * Cleanup (remove) the debugfs files for use on module exit.
+*/
+static void __devexit s3c_hsotg_delete_debug(struct s3c_hsotg *hsotg)
+{
+        unsigned epidx;
+
+        for (epidx = 0; epidx < S3C_HSOTG_EPS; epidx++) {
+                struct s3c_hsotg_ep *ep = &hsotg->eps[epidx];
+                debugfs_remove(ep->debugfs);
+        }
+
+        debugfs_remove(hsotg->debug_file);
+        debugfs_remove(hsotg->debug_fifo);
+        debugfs_remove(hsotg->debug_root);
+}
+
+/**
+ * s3c_hsotg_gate - set the hardware gate for the block
+ * @pdev: The device we bound to
+ * @on: On or off.
+ *
+ * Set the hardware gate setting into the block. If we end up on
+ * something other than an S3C64XX, then we might need to change this
+ * to using a platform data callback, or some other mechanism.
+ */
+static void s3c_hsotg_gate(struct platform_device *pdev, bool on)
+{
+        unsigned long flags;
+        u32 others;
+
+        local_irq_save(flags);
+
+        others = __raw_readl(S3C64XX_OTHERS);
+        if (on)
+                others |= S3C64XX_OTHERS_USBMASK;
+        else
+                others &= ~S3C64XX_OTHERS_USBMASK;
+        __raw_writel(others, S3C64XX_OTHERS);
+
+        local_irq_restore(flags);
+}
+
+struct s3c_hsotg_plat s3c_hsotg_default_pdata;
+
+static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
+{
+        struct s3c_hsotg_plat *plat = pdev->dev.platform_data;
+        struct device *dev = &pdev->dev;
+        struct s3c_hsotg *hsotg;
+        struct resource *res;
+        int epnum;
+        int ret;
+
+        if (!plat)
+                plat = &s3c_hsotg_default_pdata;
+
+        hsotg = kzalloc(sizeof(struct s3c_hsotg) +
+                        sizeof(struct s3c_hsotg_ep) * S3C_HSOTG_EPS,
+                        GFP_KERNEL);
+        if (!hsotg) {
+                dev_err(dev, "cannot get memory\n");
+                return -ENOMEM;
+        }
+
+        hsotg->dev = dev;
+        hsotg->plat = plat;
+
+        platform_set_drvdata(pdev, hsotg);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(dev, "cannot find register resource 0\n");
+                ret = -EINVAL;
+                goto err_mem;
+        }
+
+        hsotg->regs_res = request_mem_region(res->start, resource_size(res),
+                                             dev_name(dev));
+        if (!hsotg->regs_res) {
+                dev_err(dev, "cannot reserve registers\n");
+                ret = -ENOENT;
+                goto err_mem;
+        }
+
+        hsotg->regs = ioremap(res->start, resource_size(res));
+        if (!hsotg->regs) {
+                dev_err(dev, "cannot map registers\n");
+                ret = -ENXIO;
+                goto err_regs_res;
+        }
+
+        ret = platform_get_irq(pdev, 0);
+        if (ret < 0) {
+                dev_err(dev, "cannot find IRQ\n");
+                goto err_regs;
+        }
+
+        hsotg->irq = ret;
+
+        ret = request_irq(ret, s3c_hsotg_irq, 0, dev_name(dev), hsotg);
+        if (ret < 0) {
+                dev_err(dev, "cannot claim IRQ\n");
+                goto err_regs;
+        }
+
+        dev_info(dev, "regs %p, irq %d\n", hsotg->regs, hsotg->irq);
+
+        device_initialize(&hsotg->gadget.dev);
+
+        dev_set_name(&hsotg->gadget.dev, "gadget");
+
+        hsotg->gadget.is_dualspeed = 1;
+        hsotg->gadget.ops = &s3c_hsotg_gadget_ops;
+        hsotg->gadget.name = dev_name(dev);
+
+        hsotg->gadget.dev.parent = dev;
+        hsotg->gadget.dev.dma_mask = dev->dma_mask;
+
+        /* setup endpoint information */
+
+        INIT_LIST_HEAD(&hsotg->gadget.ep_list);
+        hsotg->gadget.ep0 = &hsotg->eps[0].ep;
+
+        /* allocate EP0 request */
+
+        hsotg->ctrl_req = s3c_hsotg_ep_alloc_request(&hsotg->eps[0].ep,
+                                                     GFP_KERNEL);
+        if (!hsotg->ctrl_req) {
+                dev_err(dev, "failed to allocate ctrl req\n");
+                goto err_regs;
+        }
+
+        /* reset the system */
+
+        s3c_hsotg_gate(pdev, true);
+
+        s3c_hsotg_otgreset(hsotg);
+        s3c_hsotg_corereset(hsotg);
+        s3c_hsotg_init(hsotg);
+
+        /* initialise the endpoints now the core has been initialised */
+        for (epnum = 0; epnum < S3C_HSOTG_EPS; epnum++)
+                s3c_hsotg_initep(hsotg, &hsotg->eps[epnum], epnum);
+
+        s3c_hsotg_create_debug(hsotg);
+
+        s3c_hsotg_dump(hsotg);
+
+        our_hsotg = hsotg;
+        return 0;
+
+err_regs:
+        iounmap(hsotg->regs);
+
+err_regs_res:
+        release_resource(hsotg->regs_res);
+        kfree(hsotg->regs_res);
+
+err_mem:
+        kfree(hsotg);
+        return ret;
+}
+
+static int __devexit s3c_hsotg_remove(struct platform_device *pdev)
+{
+        struct s3c_hsotg *hsotg = platform_get_drvdata(pdev);
+
+        s3c_hsotg_delete_debug(hsotg);
+
+        usb_gadget_unregister_driver(hsotg->driver);
+
+        free_irq(hsotg->irq, hsotg);
+        iounmap(hsotg->regs);
+
+        release_resource(hsotg->regs_res);
+        kfree(hsotg->regs_res);
+
+        s3c_hsotg_gate(pdev, false);
+
+        kfree(hsotg);
+        return 0;
+}
+
+#if 1
+#define s3c_hsotg_suspend NULL
+#define s3c_hsotg_resume NULL
+#endif
+
+static struct platform_driver s3c_hsotg_driver = {
+        .driver         = {
+                .name   = "s3c-hsotg",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = s3c_hsotg_probe,
+        .remove         = __devexit_p(s3c_hsotg_remove),
+        .suspend        = s3c_hsotg_suspend,
+        .resume         = s3c_hsotg_resume,
+};
+
+static int __init s3c_hsotg_modinit(void)
+{
+        return platform_driver_register(&s3c_hsotg_driver);
+}
+
+static void __exit s3c_hsotg_modexit(void)
+{
+        platform_driver_unregister(&s3c_hsotg_driver);
+}
+
+module_init(s3c_hsotg_modinit);
+module_exit(s3c_hsotg_modexit);
+
+MODULE_DESCRIPTION("Samsung S3C USB High-speed/OtG device");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s3c-hsotg");
diff --git a/drivers/usb/gadget/u_audio.c b/drivers/usb/gadget/u_audio.c
new file mode 100644
index 000000000000..0f3d22fc030e
--- /dev/null
+++ b/drivers/usb/gadget/u_audio.c
@@ -0,0 +1,319 @@
+/*
+ * u_audio.c -- ALSA audio utilities for Gadget stack
+ *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/utsname.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/ctype.h>
+#include <linux/random.h>
+#include <linux/syscalls.h>
+
+#include "u_audio.h"
+
+/*
+ * This component encapsulates the ALSA devices for USB audio gadget
+ */
+
+#define FILE_PCM_PLAYBACK       "/dev/snd/pcmC0D0p"
+#define FILE_PCM_CAPTURE        "/dev/snd/pcmC0D0c"
+#define FILE_CONTROL            "/dev/snd/controlC0"
+
+static char *fn_play = FILE_PCM_PLAYBACK;
+module_param(fn_play, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
+
+static char *fn_cap = FILE_PCM_CAPTURE;
+module_param(fn_cap, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
+
+static char *fn_cntl = FILE_CONTROL;
+module_param(fn_cntl, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_cntl, "Control device file name");
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * Some ALSA internal helper functions
+ */
+static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
+{
+        struct snd_interval t;
+        t.empty = 0;
+        t.min = t.max = val;
+        t.openmin = t.openmax = 0;
+        t.integer = 1;
+        return snd_interval_refine(i, &t);
+}
+
+static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
+                                 snd_pcm_hw_param_t var, unsigned int val,
+                                 int dir)
+{
+        int changed;
+        if (hw_is_mask(var)) {
+                struct snd_mask *m = hw_param_mask(params, var);
+                if (val == 0 && dir < 0) {
+                        changed = -EINVAL;
+                        snd_mask_none(m);
+                } else {
+                        if (dir > 0)
+                                val++;
+                        else if (dir < 0)
+                                val--;
+                        changed = snd_mask_refine_set(
+                                        hw_param_mask(params, var), val);
+                }
+        } else if (hw_is_interval(var)) {
+                struct snd_interval *i = hw_param_interval(params, var);
+                if (val == 0 && dir < 0) {
+                        changed = -EINVAL;
+                        snd_interval_none(i);
+                } else if (dir == 0)
+                        changed = snd_interval_refine_set(i, val);
+                else {
+                        struct snd_interval t;
+                        t.openmin = 1;
+                        t.openmax = 1;
+                        t.empty = 0;
+                        t.integer = 0;
+                        if (dir < 0) {
+                                t.min = val - 1;
+                                t.max = val;
+                        } else {
+                                t.min = val;
+                                t.max = val+1;
+                        }
+                        changed = snd_interval_refine(i, &t);
+                }
+        } else
+                return -EINVAL;
+        if (changed) {
+                params->cmask |= 1 << var;
+                params->rmask |= 1 << var;
+        }
+        return changed;
+}
+/*-------------------------------------------------------------------------*/
+
+/**
+ * Set default hardware params
+ */
+static int playback_default_hw_params(struct gaudio_snd_dev *snd)
+{
+        struct snd_pcm_substream *substream = snd->substream;
+        struct snd_pcm_hw_params *params;
+        snd_pcm_sframes_t result;
+
+       /*
+        * SNDRV_PCM_ACCESS_RW_INTERLEAVED,
+        * SNDRV_PCM_FORMAT_S16_LE
+        * CHANNELS: 2
+        * RATE: 48000
+        */
+        snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
+        snd->format = SNDRV_PCM_FORMAT_S16_LE;
+        snd->channels = 2;
+        snd->rate = 48000;
+
+        params = kzalloc(sizeof(*params), GFP_KERNEL);
+        if (!params)
+                return -ENOMEM;
+
+        _snd_pcm_hw_params_any(params);
+        _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
+                        snd->access, 0);
+        _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
+                        snd->format, 0);
+        _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
+                        snd->channels, 0);
+        _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
+                        snd->rate, 0);
+
+        snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
+        snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, params);
+
+        result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
+        if (result < 0) {
+                ERROR(snd->card,
+                        "Preparing sound card failed: %d\n", (int)result);
+                kfree(params);
+                return result;
+        }
+
+        /* Store the hardware parameters */
+        snd->access = params_access(params);
+        snd->format = params_format(params);
+        snd->channels = params_channels(params);
+        snd->rate = params_rate(params);
+
+        kfree(params);
+
+        INFO(snd->card,
+                "Hardware params: access %x, format %x, channels %d, rate %d\n",
+                snd->access, snd->format, snd->channels, snd->rate);
+
+        return 0;
+}
+
+/**
+ * Playback audio buffer data by ALSA PCM device
+ */
+static size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
+{
+        struct gaudio_snd_dev   *snd = &card->playback;
+        struct snd_pcm_substream *substream = snd->substream;
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        mm_segment_t old_fs;
+        ssize_t result;
+        snd_pcm_sframes_t frames;
+
+try_again:
+        if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
+                runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
+                result = snd_pcm_kernel_ioctl(substream,
+                                SNDRV_PCM_IOCTL_PREPARE, NULL);
+                if (result < 0) {
+                        ERROR(card, "Preparing sound card failed: %d\n",
+                                        (int)result);
+                        return result;
+                }
+        }
+
+        frames = bytes_to_frames(runtime, count);
+        old_fs = get_fs();
+        set_fs(KERNEL_DS);
+        result = snd_pcm_lib_write(snd->substream, buf, frames);
+        if (result != frames) {
+                ERROR(card, "Playback error: %d\n", (int)result);
+                set_fs(old_fs);
+                goto try_again;
+        }
+        set_fs(old_fs);
+
+        return 0;
+}
+
+static int u_audio_get_playback_channels(struct gaudio *card)
+{
+        return card->playback.channels;
+}
+
+static int u_audio_get_playback_rate(struct gaudio *card)
+{
+        return card->playback.rate;
+}
+
+/**
+ * Open ALSA PCM and control device files
+ * Initial the PCM or control device
+ */
+static int gaudio_open_snd_dev(struct gaudio *card)
+{
+        struct snd_pcm_file *pcm_file;
+        struct gaudio_snd_dev *snd;
+
+        if (!card)
+                return -ENODEV;
+
+        /* Open control device */
+        snd = &card->control;
+        snd->filp = filp_open(fn_cntl, O_RDWR, 0);
+        if (IS_ERR(snd->filp)) {
+                int ret = PTR_ERR(snd->filp);
+                ERROR(card, "unable to open sound control device file: %s\n",
+                                fn_cntl);
+                snd->filp = NULL;
+                return ret;
+        }
+        snd->card = card;
+
+        /* Open PCM playback device and setup substream */
+        snd = &card->playback;
+        snd->filp = filp_open(fn_play, O_WRONLY, 0);
+        if (IS_ERR(snd->filp)) {
+                ERROR(card, "No such PCM playback device: %s\n", fn_play);
+                snd->filp = NULL;
+        }
+        pcm_file = snd->filp->private_data;
+        snd->substream = pcm_file->substream;
+        snd->card = card;
+        playback_default_hw_params(snd);
+
+        /* Open PCM capture device and setup substream */
+        snd = &card->capture;
+        snd->filp = filp_open(fn_cap, O_RDONLY, 0);
+        if (IS_ERR(snd->filp)) {
+                ERROR(card, "No such PCM capture device: %s\n", fn_cap);
+                snd->filp = NULL;
+        }
+        pcm_file = snd->filp->private_data;
+        snd->substream = pcm_file->substream;
+        snd->card = card;
+
+        return 0;
+}
+
+/**
+ * Close ALSA PCM and control device files
+ */
+static int gaudio_close_snd_dev(struct gaudio *gau)
+{
+        struct gaudio_snd_dev   *snd;
+
+        /* Close control device */
+        snd = &gau->control;
+        if (!IS_ERR(snd->filp))
+                filp_close(snd->filp, current->files);
+
+        /* Close PCM playback device and setup substream */
+        snd = &gau->playback;
+        if (!IS_ERR(snd->filp))
+                filp_close(snd->filp, current->files);
+
+        /* Close PCM capture device and setup substream */
+        snd = &gau->capture;
+        if (!IS_ERR(snd->filp))
+                filp_close(snd->filp, current->files);
+
+        return 0;
+}
+
+/**
+ * gaudio_setup - setup ALSA interface and preparing for USB transfer
+ *
+ * This sets up PCM, mixer or MIDI ALSA devices fore USB gadget using.
+ *
+ * Returns negative errno, or zero on success
+ */
+int __init gaudio_setup(struct gaudio *card)
+{
+        int     ret;
+
+        ret = gaudio_open_snd_dev(card);
+        if (ret)
+                ERROR(card, "we need at least one control device\n");
+
+        return ret;
+
+}
+
+/**
+ * gaudio_cleanup - remove ALSA device interface
+ *
+ * This is called to free all resources allocated by @gaudio_setup().
+ */
+void gaudio_cleanup(struct gaudio *card)
+{
+        if (card)
+                gaudio_close_snd_dev(card);
+}
+
diff --git a/drivers/usb/gadget/u_audio.h b/drivers/usb/gadget/u_audio.h
new file mode 100644
index 000000000000..cc8d159c648a
--- /dev/null
+++ b/drivers/usb/gadget/u_audio.h
@@ -0,0 +1,56 @@
+/*
+ * u_audio.h -- interface to USB gadget "ALSA AUDIO" utilities
+ *
+ * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
+ * Copyright (C) 2008 Analog Devices, Inc
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __U_AUDIO_H
+#define __U_AUDIO_H
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/usb/audio.h>
+#include <linux/usb/composite.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "gadget_chips.h"
+
+/*
+ * This represents the USB side of an audio card device, managed by a USB
+ * function which provides control and stream interfaces.
+ */
+
+struct gaudio_snd_dev {
+        struct gaudio                   *card;
+        struct file                     *filp;
+        struct snd_pcm_substream        *substream;
+        int                             access;
+        int                             format;
+        int                             channels;
+        int                             rate;
+};
+
+struct gaudio {
+        struct usb_function             func;
+        struct usb_gadget               *gadget;
+
+        /* ALSA sound device interfaces */
+        struct gaudio_snd_dev           control;
+        struct gaudio_snd_dev           playback;
+        struct gaudio_snd_dev           capture;
+
+        /* TODO */
+};
+
+int gaudio_setup(struct gaudio *card);
+void gaudio_cleanup(struct gaudio *card);
+
+#endif /* __U_AUDIO_H */
diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index 0a4d99ab40d8..fc6e709f45b1 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -371,6 +371,7 @@ __acquires(&port->port_lock)
 
                 req->length = len;
                 list_del(&req->list);
+                req->zero = (gs_buf_data_avail(&port->port_write_buf) == 0);
 
                 pr_vdebug(PREFIX "%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n",
                                 port->port_num, len, *((u8 *)req->buf),
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 845479f7c707..1576a0520adf 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -17,6 +17,26 @@ config USB_C67X00_HCD
           To compile this driver as a module, choose M here: the
           module will be called c67x00.
 
+config USB_XHCI_HCD
+        tristate "xHCI HCD (USB 3.0) support (EXPERIMENTAL)"
+        depends on USB && PCI && EXPERIMENTAL
+        ---help---
+          The eXtensible Host Controller Interface (xHCI) is standard for USB 3.0
+          "SuperSpeed" host controller hardware.
+
+          To compile this driver as a module, choose M here: the
+          module will be called xhci-hcd.
+
+config USB_XHCI_HCD_DEBUGGING
+        bool "Debugging for the xHCI host controller"
+        depends on USB_XHCI_HCD
+        ---help---
+          Say 'Y' to turn on debugging for the xHCI host controller driver.
+          This will spew debugging output, even in interrupt context.
+          This should only be used for debugging xHCI driver bugs.
+
+          If unsure, say N.
+
 config USB_EHCI_HCD
         tristate "EHCI HCD (USB 2.0) support"
         depends on USB && USB_ARCH_HAS_EHCI
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index f163571e33d8..289d748bb414 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -12,6 +12,7 @@ fhci-objs := fhci-hcd.o fhci-hub.o fhci-q.o fhci-mem.o \
 ifeq ($(CONFIG_FHCI_DEBUG),y)
 fhci-objs += fhci-dbg.o
 endif
+xhci-objs := xhci-hcd.o xhci-mem.o xhci-pci.o xhci-ring.o xhci-hub.o xhci-dbg.o
 
 obj-$(CONFIG_USB_WHCI_HCD)      += whci/
 
@@ -23,6 +24,7 @@ obj-$(CONFIG_USB_ISP116X_HCD)	+= isp116x-hcd.o
 obj-$(CONFIG_USB_OHCI_HCD)      += ohci-hcd.o
 obj-$(CONFIG_USB_UHCI_HCD)      += uhci-hcd.o
 obj-$(CONFIG_USB_FHCI_HCD)      += fhci.o
+obj-$(CONFIG_USB_XHCI_HCD)      += xhci.o
 obj-$(CONFIG_USB_SL811_HCD)     += sl811-hcd.o
 obj-$(CONFIG_USB_SL811_CS)      += sl811_cs.o
 obj-$(CONFIG_USB_U132_HCD)      += u132-hcd.o
diff --git a/drivers/usb/host/ehci-au1xxx.c b/drivers/usb/host/ehci-au1xxx.c
index bf69f4739107..c3a778bd359c 100644
--- a/drivers/usb/host/ehci-au1xxx.c
+++ b/drivers/usb/host/ehci-au1xxx.c
@@ -97,6 +97,7 @@ static const struct hc_driver ehci_au1xxx_hc_driver = {
         .urb_enqueue            = ehci_urb_enqueue,
         .urb_dequeue            = ehci_urb_dequeue,
         .endpoint_disable       = ehci_endpoint_disable,
+        .endpoint_reset         = ehci_endpoint_reset,
 
         /*
          * scheduling support
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 01c3da34f678..bf86809c5120 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -309,6 +309,7 @@ static const struct hc_driver ehci_fsl_hc_driver = {
         .urb_enqueue = ehci_urb_enqueue,
         .urb_dequeue = ehci_urb_dequeue,
         .endpoint_disable = ehci_endpoint_disable,
+        .endpoint_reset = ehci_endpoint_reset,
 
         /*
          * scheduling support
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index c637207a1c80..2b72473544d3 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1024,6 +1024,51 @@ done:
         return;
 }
 
+static void
+ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
+{
+        struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
+        struct ehci_qh          *qh;
+        int                     eptype = usb_endpoint_type(&ep->desc);
+
+        if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
+                return;
+
+ rescan:
+        spin_lock_irq(&ehci->lock);
+        qh = ep->hcpriv;
+
+        /* For Bulk and Interrupt endpoints we maintain the toggle state
+         * in the hardware; the toggle bits in udev aren't used at all.
+         * When an endpoint is reset by usb_clear_halt() we must reset
+         * the toggle bit in the QH.
+         */
+        if (qh) {
+                if (!list_empty(&qh->qtd_list)) {
+                        WARN_ONCE(1, "clear_halt for a busy endpoint\n");
+                } else if (qh->qh_state == QH_STATE_IDLE) {
+                        qh->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE);
+                } else {
+                        /* It's not safe to write into the overlay area
+                         * while the QH is active.  Unlink it first and
+                         * wait for the unlink to complete.
+                         */
+                        if (qh->qh_state == QH_STATE_LINKED) {
+                                if (eptype == USB_ENDPOINT_XFER_BULK) {
+                                        unlink_async(ehci, qh);
+                                } else {
+                                        intr_deschedule(ehci, qh);
+                                        (void) qh_schedule(ehci, qh);
+                                }
+                        }
+                        spin_unlock_irq(&ehci->lock);
+                        schedule_timeout_uninterruptible(1);
+                        goto rescan;
+                }
+        }
+        spin_unlock_irq(&ehci->lock);
+}
+
 static int ehci_get_frame (struct usb_hcd *hcd)
 {
         struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
@@ -1097,7 +1142,7 @@ static int __init ehci_hcd_init(void)
                  sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
 
 #ifdef DEBUG
-        ehci_debug_root = debugfs_create_dir("ehci", NULL);
+        ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root);
         if (!ehci_debug_root) {
                 retval = -ENOENT;
                 goto err_debug;
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 97a53a48a3d8..f46ad27c9a90 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -391,7 +391,7 @@ static inline void create_companion_file(struct ehci_hcd *ehci)
 
         /* with integrated TT there is no companion! */
         if (!ehci_is_TDI(ehci))
-                i = device_create_file(ehci_to_hcd(ehci)->self.dev,
+                i = device_create_file(ehci_to_hcd(ehci)->self.controller,
                                        &dev_attr_companion);
 }
 
@@ -399,7 +399,7 @@ static inline void remove_companion_file(struct ehci_hcd *ehci)
 {
         /* with integrated TT there is no companion! */
         if (!ehci_is_TDI(ehci))
-                device_remove_file(ehci_to_hcd(ehci)->self.dev,
+                device_remove_file(ehci_to_hcd(ehci)->self.controller,
                                    &dev_attr_companion);
 }
 
diff --git a/drivers/usb/host/ehci-ixp4xx.c b/drivers/usb/host/ehci-ixp4xx.c
index 9c32063a0c2f..a44bb4a94954 100644
--- a/drivers/usb/host/ehci-ixp4xx.c
+++ b/drivers/usb/host/ehci-ixp4xx.c
@@ -51,6 +51,7 @@ static const struct hc_driver ixp4xx_ehci_hc_driver = {
         .urb_enqueue            = ehci_urb_enqueue,
         .urb_dequeue            = ehci_urb_dequeue,
         .endpoint_disable       = ehci_endpoint_disable,
+        .endpoint_reset         = ehci_endpoint_reset,
         .get_frame_number       = ehci_get_frame,
         .hub_status_data        = ehci_hub_status_data,
         .hub_control            = ehci_hub_control,
diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
index 9d487908012e..770dd9aba62a 100644
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -149,6 +149,7 @@ static const struct hc_driver ehci_orion_hc_driver = {
         .urb_enqueue = ehci_urb_enqueue,
         .urb_dequeue = ehci_urb_dequeue,
         .endpoint_disable = ehci_endpoint_disable,
+        .endpoint_reset = ehci_endpoint_reset,
 
         /*
          * scheduling support
@@ -187,7 +188,7 @@ ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
         }
 }
 
-static int __init ehci_orion_drv_probe(struct platform_device *pdev)
+static int __devinit ehci_orion_drv_probe(struct platform_device *pdev)
 {
         struct orion_ehci_data *pd = pdev->dev.platform_data;
         struct resource *res;
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 5aa8bce90e1f..f3683e1da161 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -268,7 +268,7 @@ done:
  * Also they depend on separate root hub suspend/resume.
  */
 
-static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
+static int ehci_pci_suspend(struct usb_hcd *hcd)
 {
         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
         unsigned long           flags;
@@ -293,12 +293,6 @@ static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
         (void)ehci_readl(ehci, &ehci->regs->intr_enable);
 
-        /* make sure snapshot being resumed re-enumerates everything */
-        if (message.event == PM_EVENT_PRETHAW) {
-                ehci_halt(ehci);
-                ehci_reset(ehci);
-        }
-
         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
  bail:
         spin_unlock_irqrestore (&ehci->lock, flags);
@@ -309,7 +303,7 @@ static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
         return rc;
 }
 
-static int ehci_pci_resume(struct usb_hcd *hcd)
+static int ehci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 {
         struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
@@ -322,10 +316,12 @@ static int ehci_pci_resume(struct usb_hcd *hcd)
         /* Mark hardware accessible again as we are out of D3 state by now */
         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 
-        /* If CF is still set, we maintained PCI Vaux power.
+        /* If CF is still set and we aren't resuming from hibernation
+         * then we maintained PCI Vaux power.
          * Just undo the effect of ehci_pci_suspend().
          */
-        if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
+        if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
+                                !hibernated) {
                 int     mask = INTR_MASK;
 
                 if (!hcd->self.root_hub->do_remote_wakeup)
@@ -335,7 +331,6 @@ static int ehci_pci_resume(struct usb_hcd *hcd)
                 return 0;
         }
 
-        ehci_dbg(ehci, "lost power, restarting\n");
         usb_root_hub_lost_power(hcd->self.root_hub);
 
         /* Else reset, to cope with power loss or flush-to-storage
@@ -393,6 +388,7 @@ static const struct hc_driver ehci_pci_hc_driver = {
         .urb_enqueue =          ehci_urb_enqueue,
         .urb_dequeue =          ehci_urb_dequeue,
         .endpoint_disable =     ehci_endpoint_disable,
+        .endpoint_reset =       ehci_endpoint_reset,
 
         /*
          * scheduling support
@@ -429,10 +425,11 @@ static struct pci_driver ehci_pci_driver = {
 
         .probe =        usb_hcd_pci_probe,
         .remove =       usb_hcd_pci_remove,
+        .shutdown =     usb_hcd_pci_shutdown,
 
-#ifdef  CONFIG_PM
-        .suspend =      usb_hcd_pci_suspend,
-        .resume =       usb_hcd_pci_resume,
+#ifdef CONFIG_PM_SLEEP
+        .driver =       {
+                .pm =   &usb_hcd_pci_pm_ops
+        },
 #endif
-        .shutdown =     usb_hcd_pci_shutdown,
 };
diff --git a/drivers/usb/host/ehci-ppc-of.c b/drivers/usb/host/ehci-ppc-of.c
index ef732b704f53..fbd272288fc2 100644
--- a/drivers/usb/host/ehci-ppc-of.c
+++ b/drivers/usb/host/ehci-ppc-of.c
@@ -61,6 +61,7 @@ static const struct hc_driver ehci_ppc_of_hc_driver = {
         .urb_enqueue            = ehci_urb_enqueue,
         .urb_dequeue            = ehci_urb_dequeue,
         .endpoint_disable       = ehci_endpoint_disable,
+        .endpoint_reset         = ehci_endpoint_reset,
 
         /*
          * scheduling support
diff --git a/drivers/usb/host/ehci-ps3.c b/drivers/usb/host/ehci-ps3.c
index bb870b8f81bc..eecd2a0680a2 100644
--- a/drivers/usb/host/ehci-ps3.c
+++ b/drivers/usb/host/ehci-ps3.c
@@ -65,6 +65,7 @@ static const struct hc_driver ps3_ehci_hc_driver = {
         .urb_enqueue            = ehci_urb_enqueue,
         .urb_dequeue            = ehci_urb_dequeue,
         .endpoint_disable       = ehci_endpoint_disable,
+        .endpoint_reset         = ehci_endpoint_reset,
         .get_frame_number       = ehci_get_frame,
         .hub_status_data        = ehci_hub_status_data,
         .hub_control            = ehci_hub_control,
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 1976b1b3778c..3192f683f807 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -93,22 +93,6 @@ qh_update (struct ehci_hcd *ehci, struct ehci_qh *qh, struct ehci_qtd *qtd)
         qh->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma);
         qh->hw_alt_next = EHCI_LIST_END(ehci);
 
-        /* Except for control endpoints, we make hardware maintain data
-         * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
-         * and set the pseudo-toggle in udev. Only usb_clear_halt() will
-         * ever clear it.
-         */
-        if (!(qh->hw_info1 & cpu_to_hc32(ehci, 1 << 14))) {
-                unsigned        is_out, epnum;
-
-                is_out = !(qtd->hw_token & cpu_to_hc32(ehci, 1 << 8));
-                epnum = (hc32_to_cpup(ehci, &qh->hw_info1) >> 8) & 0x0f;
-                if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) {
-                        qh->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE);
-                        usb_settoggle (qh->dev, epnum, is_out, 1);
-                }
-        }
-
         /* HC must see latest qtd and qh data before we clear ACTIVE+HALT */
         wmb ();
         qh->hw_token &= cpu_to_hc32(ehci, QTD_TOGGLE | QTD_STS_PING);
@@ -850,7 +834,6 @@ done:
         qh->qh_state = QH_STATE_IDLE;
         qh->hw_info1 = cpu_to_hc32(ehci, info1);
         qh->hw_info2 = cpu_to_hc32(ehci, info2);
-        usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1);
         qh_refresh (ehci, qh);
         return qh;
 }
@@ -881,7 +864,7 @@ static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
                 }
         }
 
-        /* clear halt and/or toggle; and maybe recover from silicon quirk */
+        /* clear halt and maybe recover from silicon quirk */
         if (qh->qh_state == QH_STATE_IDLE)
                 qh_refresh (ehci, qh);
 
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 556d0ec0c1f8..9d1babc7ff65 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -760,8 +760,10 @@ static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
         if (status) {
                 /* "normal" case, uframing flexible except with splits */
                 if (qh->period) {
-                        frame = qh->period - 1;
-                        do {
+                        int             i;
+
+                        for (i = qh->period; status && i > 0; --i) {
+                                frame = ++ehci->random_frame % qh->period;
                                 for (uframe = 0; uframe < 8; uframe++) {
                                         status = check_intr_schedule (ehci,
                                                         frame, uframe, qh,
@@ -769,7 +771,7 @@ static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
                                         if (status == 0)
                                                 break;
                                 }
-                        } while (status && frame--);
+                        }
 
                 /* qh->period == 0 means every uframe */
                 } else {
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 6cff195e1a36..90ad3395bb21 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -116,6 +116,7 @@ struct ehci_hcd {			/* one per controller */
         struct timer_list       watchdog;
         unsigned long           actions;
         unsigned                stamp;
+        unsigned                random_frame;
         unsigned long           next_statechange;
         u32                     command;
 
diff --git a/drivers/usb/host/fhci-dbg.c b/drivers/usb/host/fhci-dbg.c
index ea8a4255c5da..e799f86dab11 100644
--- a/drivers/usb/host/fhci-dbg.c
+++ b/drivers/usb/host/fhci-dbg.c
@@ -108,7 +108,7 @@ void fhci_dfs_create(struct fhci_hcd *fhci)
 {
         struct device *dev = fhci_to_hcd(fhci)->self.controller;
 
-        fhci->dfs_root = debugfs_create_dir(dev_name(dev), NULL);
+        fhci->dfs_root = debugfs_create_dir(dev_name(dev), usb_debug_root);
         if (!fhci->dfs_root) {
                 WARN_ON(1);
                 return;
diff --git a/drivers/usb/host/hwa-hc.c b/drivers/usb/host/hwa-hc.c
index cbf30e515f29..88b03214622b 100644
--- a/drivers/usb/host/hwa-hc.c
+++ b/drivers/usb/host/hwa-hc.c
@@ -172,25 +172,6 @@ error_cluster_id_get:
 
 }
 
-static int hwahc_op_suspend(struct usb_hcd *usb_hcd, pm_message_t msg)
-{
-        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
-        struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
-        dev_err(wusbhc->dev, "%s (%p [%p], 0x%lx) UNIMPLEMENTED\n", __func__,
-                usb_hcd, hwahc, *(unsigned long *) &msg);
-        return -ENOSYS;
-}
-
-static int hwahc_op_resume(struct usb_hcd *usb_hcd)
-{
-        struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
-        struct hwahc *hwahc = container_of(wusbhc, struct hwahc, wusbhc);
-
-        dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
-                usb_hcd, hwahc);
-        return -ENOSYS;
-}
-
 /*
  * No need to abort pipes, as when this is called, all the children
  * has been disconnected and that has done it [through
@@ -598,8 +579,6 @@ static struct hc_driver hwahc_hc_driver = {
         .flags = HCD_USB2,              /* FIXME */
         .reset = hwahc_op_reset,
         .start = hwahc_op_start,
-        .pci_suspend = hwahc_op_suspend,
-        .pci_resume = hwahc_op_resume,
         .stop = hwahc_op_stop,
         .get_frame_number = hwahc_op_get_frame_number,
         .urb_enqueue = hwahc_op_urb_enqueue,
diff --git a/drivers/usb/host/ohci-dbg.c b/drivers/usb/host/ohci-dbg.c
index d3269656aa4d..811f5dfdc582 100644
--- a/drivers/usb/host/ohci-dbg.c
+++ b/drivers/usb/host/ohci-dbg.c
@@ -431,7 +431,7 @@ static struct dentry *ohci_debug_root;
 
 struct debug_buffer {
         ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
-        struct device *dev;
+        struct ohci_hcd *ohci;
         struct mutex mutex;     /* protect filling of buffer */
         size_t count;           /* number of characters filled into buffer */
         char *page;
@@ -505,15 +505,11 @@ show_list (struct ohci_hcd *ohci, char *buf, size_t count, struct ed *ed)
 
 static ssize_t fill_async_buffer(struct debug_buffer *buf)
 {
-        struct usb_bus          *bus;
-        struct usb_hcd          *hcd;
         struct ohci_hcd         *ohci;
         size_t                  temp;
         unsigned long           flags;
 
-        bus = dev_get_drvdata(buf->dev);
-        hcd = bus_to_hcd(bus);
-        ohci = hcd_to_ohci(hcd);
+        ohci = buf->ohci;
 
         /* display control and bulk lists together, for simplicity */
         spin_lock_irqsave (&ohci->lock, flags);
@@ -529,8 +525,6 @@ static ssize_t fill_async_buffer(struct debug_buffer *buf)
 
 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
 {
-        struct usb_bus          *bus;
-        struct usb_hcd          *hcd;
         struct ohci_hcd         *ohci;
         struct ed               **seen, *ed;
         unsigned long           flags;
@@ -542,9 +536,7 @@ static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
                 return 0;
         seen_count = 0;
 
-        bus = (struct usb_bus *)dev_get_drvdata(buf->dev);
-        hcd = bus_to_hcd(bus);
-        ohci = hcd_to_ohci(hcd);
+        ohci = buf->ohci;
         next = buf->page;
         size = PAGE_SIZE;
 
@@ -626,7 +618,6 @@ static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
 
 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 {
-        struct usb_bus          *bus;
         struct usb_hcd          *hcd;
         struct ohci_hcd         *ohci;
         struct ohci_regs __iomem *regs;
@@ -635,9 +626,8 @@ static ssize_t fill_registers_buffer(struct debug_buffer *buf)
         char                    *next;
         u32                     rdata;
 
-        bus = (struct usb_bus *)dev_get_drvdata(buf->dev);
-        hcd = bus_to_hcd(bus);
-        ohci = hcd_to_ohci(hcd);
+        ohci = buf->ohci;
+        hcd = ohci_to_hcd(ohci);
         regs = ohci->regs;
         next = buf->page;
         size = PAGE_SIZE;
@@ -710,7 +700,7 @@ done:
         return PAGE_SIZE - size;
 }
 
-static struct debug_buffer *alloc_buffer(struct device *dev,
+static struct debug_buffer *alloc_buffer(struct ohci_hcd *ohci,
                                 ssize_t (*fill_func)(struct debug_buffer *))
 {
         struct debug_buffer *buf;
@@ -718,7 +708,7 @@ static struct debug_buffer *alloc_buffer(struct device *dev,
         buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 
         if (buf) {
-                buf->dev = dev;
+                buf->ohci = ohci;
                 buf->fill_func = fill_func;
                 mutex_init(&buf->mutex);
         }
@@ -810,26 +800,25 @@ static int debug_registers_open(struct inode *inode, struct file *file)
 static inline void create_debug_files (struct ohci_hcd *ohci)
 {
         struct usb_bus *bus = &ohci_to_hcd(ohci)->self;
-        struct device *dev = bus->dev;
 
         ohci->debug_dir = debugfs_create_dir(bus->bus_name, ohci_debug_root);
         if (!ohci->debug_dir)
                 goto dir_error;
 
         ohci->debug_async = debugfs_create_file("async", S_IRUGO,
-                                                ohci->debug_dir, dev,
+                                                ohci->debug_dir, ohci,
                                                 &debug_async_fops);
         if (!ohci->debug_async)
                 goto async_error;
 
         ohci->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
-                                                   ohci->debug_dir, dev,
+                                                   ohci->debug_dir, ohci,
                                                    &debug_periodic_fops);
         if (!ohci->debug_periodic)
                 goto periodic_error;
 
         ohci->debug_registers = debugfs_create_file("registers", S_IRUGO,
-                                                    ohci->debug_dir, dev,
+                                                    ohci->debug_dir, ohci,
                                                     &debug_registers_fops);
         if (!ohci->debug_registers)
                 goto registers_error;
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 25db704f3a2a..58151687d351 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -571,7 +571,7 @@ static int ohci_init (struct ohci_hcd *ohci)
  */
 static int ohci_run (struct ohci_hcd *ohci)
 {
-        u32                     mask, temp;
+        u32                     mask, val;
         int                     first = ohci->fminterval == 0;
         struct usb_hcd          *hcd = ohci_to_hcd(ohci);
 
@@ -580,8 +580,8 @@ static int ohci_run (struct ohci_hcd *ohci)
         /* boot firmware should have set this up (5.1.1.3.1) */
         if (first) {
 
-                temp = ohci_readl (ohci, &ohci->regs->fminterval);
-                ohci->fminterval = temp & 0x3fff;
+                val = ohci_readl (ohci, &ohci->regs->fminterval);
+                ohci->fminterval = val & 0x3fff;
                 if (ohci->fminterval != FI)
                         ohci_dbg (ohci, "fminterval delta %d\n",
                                 ohci->fminterval - FI);
@@ -600,25 +600,25 @@ static int ohci_run (struct ohci_hcd *ohci)
 
         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
         case OHCI_USB_OPER:
-                temp = 0;
+                val = 0;
                 break;
         case OHCI_USB_SUSPEND:
         case OHCI_USB_RESUME:
                 ohci->hc_control &= OHCI_CTRL_RWC;
                 ohci->hc_control |= OHCI_USB_RESUME;
-                temp = 10 /* msec wait */;
+                val = 10 /* msec wait */;
                 break;
         // case OHCI_USB_RESET:
         default:
                 ohci->hc_control &= OHCI_CTRL_RWC;
                 ohci->hc_control |= OHCI_USB_RESET;
-                temp = 50 /* msec wait */;
+                val = 50 /* msec wait */;
                 break;
         }
         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
         // flush the writes
         (void) ohci_readl (ohci, &ohci->regs->control);
-        msleep(temp);
+        msleep(val);
 
         memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
 
@@ -628,9 +628,9 @@ static int ohci_run (struct ohci_hcd *ohci)
 retry:
         /* HC Reset requires max 10 us delay */
         ohci_writel (ohci, OHCI_HCR,  &ohci->regs->cmdstatus);
-        temp = 30;      /* ... allow extra time */
+        val = 30;       /* ... allow extra time */
         while ((ohci_readl (ohci, &ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
-                if (--temp == 0) {
+                if (--val == 0) {
                         spin_unlock_irq (&ohci->lock);
                         ohci_err (ohci, "USB HC reset timed out!\n");
                         return -1;
@@ -699,23 +699,23 @@ retry:
         ohci_writel (ohci, mask, &ohci->regs->intrenable);
 
         /* handle root hub init quirks ... */
-        temp = roothub_a (ohci);
-        temp &= ~(RH_A_PSM | RH_A_OCPM);
+        val = roothub_a (ohci);
+        val &= ~(RH_A_PSM | RH_A_OCPM);
         if (ohci->flags & OHCI_QUIRK_SUPERIO) {
                 /* NSC 87560 and maybe others */
-                temp |= RH_A_NOCP;
-                temp &= ~(RH_A_POTPGT | RH_A_NPS);
-                ohci_writel (ohci, temp, &ohci->regs->roothub.a);
+                val |= RH_A_NOCP;
+                val &= ~(RH_A_POTPGT | RH_A_NPS);
+                ohci_writel (ohci, val, &ohci->regs->roothub.a);
         } else if ((ohci->flags & OHCI_QUIRK_AMD756) ||
                         (ohci->flags & OHCI_QUIRK_HUB_POWER)) {
                 /* hub power always on; required for AMD-756 and some
                  * Mac platforms.  ganged overcurrent reporting, if any.
                  */
-                temp |= RH_A_NPS;
-                ohci_writel (ohci, temp, &ohci->regs->roothub.a);
+                val |= RH_A_NPS;
+                ohci_writel (ohci, val, &ohci->regs->roothub.a);
         }
         ohci_writel (ohci, RH_HS_LPSC, &ohci->regs->roothub.status);
-        ohci_writel (ohci, (temp & RH_A_NPS) ? 0 : RH_B_PPCM,
+        ohci_writel (ohci, (val & RH_A_NPS) ? 0 : RH_B_PPCM,
                                                 &ohci->regs->roothub.b);
         // flush those writes
         (void) ohci_readl (ohci, &ohci->regs->control);
@@ -724,7 +724,7 @@ retry:
         spin_unlock_irq (&ohci->lock);
 
         // POTPGT delay is bits 24-31, in 2 ms units.
-        mdelay ((temp >> 23) & 0x1fe);
+        mdelay ((val >> 23) & 0x1fe);
         hcd->state = HC_STATE_RUNNING;
 
         if (quirk_zfmicro(ohci)) {
@@ -1105,7 +1105,7 @@ static int __init ohci_hcd_mod_init(void)
         set_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
 
 #ifdef DEBUG
-        ohci_debug_root = debugfs_create_dir("ohci", NULL);
+        ohci_debug_root = debugfs_create_dir("ohci", usb_debug_root);
         if (!ohci_debug_root) {
                 retval = -ENOENT;
                 goto error_debug;
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index f9961b4c0da3..d2ba04dd785e 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -372,7 +372,7 @@ static int __devinit ohci_pci_start (struct usb_hcd *hcd)
 
 #ifdef  CONFIG_PM
 
-static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
+static int ohci_pci_suspend(struct usb_hcd *hcd)
 {
         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
         unsigned long   flags;
@@ -394,10 +394,6 @@ static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
         ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
         (void)ohci_readl(ohci, &ohci->regs->intrdisable);
 
-        /* make sure snapshot being resumed re-enumerates everything */
-        if (message.event == PM_EVENT_PRETHAW)
-                ohci_usb_reset(ohci);
-
         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
  bail:
         spin_unlock_irqrestore (&ohci->lock, flags);
@@ -406,9 +402,14 @@ static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
 }
 
 
-static int ohci_pci_resume (struct usb_hcd *hcd)
+static int ohci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 {
         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+        /* Make sure resume from hibernation re-enumerates everything */
+        if (hibernated)
+                ohci_usb_reset(hcd_to_ohci(hcd));
+
         ohci_finish_controller_resume(hcd);
         return 0;
 }
@@ -484,12 +485,11 @@ static struct pci_driver ohci_pci_driver = {
 
         .probe =        usb_hcd_pci_probe,
         .remove =       usb_hcd_pci_remove,
+        .shutdown =     usb_hcd_pci_shutdown,
 
-#ifdef  CONFIG_PM
-        .suspend =      usb_hcd_pci_suspend,
-        .resume =       usb_hcd_pci_resume,
+#ifdef CONFIG_PM_SLEEP
+        .driver =       {
+                .pm =   &usb_hcd_pci_pm_ops
+        },
 #endif
-
-        .shutdown =     usb_hcd_pci_shutdown,
 };
-
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 033c2846ce59..83b5f9cea85a 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -15,6 +15,7 @@
 #include <linux/delay.h>
 #include <linux/acpi.h>
 #include "pci-quirks.h"
+#include "xhci-ext-caps.h"
 
 
 #define UHCI_USBLEGSUP          0xc0            /* legacy support */
@@ -341,7 +342,127 @@ static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev)
         return;
 }
 
+/*
+ * handshake - spin reading a register until handshake completes
+ * @ptr: address of hc register to be read
+ * @mask: bits to look at in result of read
+ * @done: value of those bits when handshake succeeds
+ * @wait_usec: timeout in microseconds
+ * @delay_usec: delay in microseconds to wait between polling
+ *
+ * Polls a register every delay_usec microseconds.
+ * Returns 0 when the mask bits have the value done.
+ * Returns -ETIMEDOUT if this condition is not true after
+ * wait_usec microseconds have passed.
+ */
+static int handshake(void __iomem *ptr, u32 mask, u32 done,
+                int wait_usec, int delay_usec)
+{
+        u32     result;
+
+        do {
+                result = readl(ptr);
+                result &= mask;
+                if (result == done)
+                        return 0;
+                udelay(delay_usec);
+                wait_usec -= delay_usec;
+        } while (wait_usec > 0);
+        return -ETIMEDOUT;
+}
+
+/**
+ * PCI Quirks for xHCI.
+ *
+ * Takes care of the handoff between the Pre-OS (i.e. BIOS) and the OS.
+ * It signals to the BIOS that the OS wants control of the host controller,
+ * and then waits 5 seconds for the BIOS to hand over control.
+ * If we timeout, assume the BIOS is broken and take control anyway.
+ */
+static void __devinit quirk_usb_handoff_xhci(struct pci_dev *pdev)
+{
+        void __iomem *base;
+        int ext_cap_offset;
+        void __iomem *op_reg_base;
+        u32 val;
+        int timeout;
+
+        if (!mmio_resource_enabled(pdev, 0))
+                return;
+
+        base = ioremap_nocache(pci_resource_start(pdev, 0),
+                                pci_resource_len(pdev, 0));
+        if (base == NULL)
+                return;
 
+        /*
+         * Find the Legacy Support Capability register -
+         * this is optional for xHCI host controllers.
+         */
+        ext_cap_offset = xhci_find_next_cap_offset(base, XHCI_HCC_PARAMS_OFFSET);
+        do {
+                if (!ext_cap_offset)
+                        /* We've reached the end of the extended capabilities */
+                        goto hc_init;
+                val = readl(base + ext_cap_offset);
+                if (XHCI_EXT_CAPS_ID(val) == XHCI_EXT_CAPS_LEGACY)
+                        break;
+                ext_cap_offset = xhci_find_next_cap_offset(base, ext_cap_offset);
+        } while (1);
+
+        /* If the BIOS owns the HC, signal that the OS wants it, and wait */
+        if (val & XHCI_HC_BIOS_OWNED) {
+                writel(val & XHCI_HC_OS_OWNED, base + ext_cap_offset);
+
+                /* Wait for 5 seconds with 10 microsecond polling interval */
+                timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,
+                                0, 5000, 10);
+
+                /* Assume a buggy BIOS and take HC ownership anyway */
+                if (timeout) {
+                        dev_warn(&pdev->dev, "xHCI BIOS handoff failed"
+                                        " (BIOS bug ?) %08x\n", val);
+                        writel(val & ~XHCI_HC_BIOS_OWNED, base + ext_cap_offset);
+                }
+        }
+
+        /* Disable any BIOS SMIs */
+        writel(XHCI_LEGACY_DISABLE_SMI,
+                        base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
+
+hc_init:
+        op_reg_base = base + XHCI_HC_LENGTH(readl(base));
+
+        /* Wait for the host controller to be ready before writing any
+         * operational or runtime registers.  Wait 5 seconds and no more.
+         */
+        timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_CNR, 0,
+                        5000, 10);
+        /* Assume a buggy HC and start HC initialization anyway */
+        if (timeout) {
+                val = readl(op_reg_base + XHCI_STS_OFFSET);
+                dev_warn(&pdev->dev,
+                                "xHCI HW not ready after 5 sec (HC bug?) "
+                                "status = 0x%x\n", val);
+        }
+
+        /* Send the halt and disable interrupts command */
+        val = readl(op_reg_base + XHCI_CMD_OFFSET);
+        val &= ~(XHCI_CMD_RUN | XHCI_IRQS);
+        writel(val, op_reg_base + XHCI_CMD_OFFSET);
+
+        /* Wait for the HC to halt - poll every 125 usec (one microframe). */
+        timeout = handshake(op_reg_base + XHCI_STS_OFFSET, XHCI_STS_HALT, 1,
+                        XHCI_MAX_HALT_USEC, 125);
+        if (timeout) {
+                val = readl(op_reg_base + XHCI_STS_OFFSET);
+                dev_warn(&pdev->dev,
+                                "xHCI HW did not halt within %d usec "
+                                "status = 0x%x\n", XHCI_MAX_HALT_USEC, val);
+        }
+
+        iounmap(base);
+}
 
 static void __devinit quirk_usb_early_handoff(struct pci_dev *pdev)
 {
@@ -351,5 +472,7 @@ static void __devinit quirk_usb_early_handoff(struct pci_dev *pdev)
                 quirk_usb_handoff_ohci(pdev);
         else if (pdev->class == PCI_CLASS_SERIAL_USB_EHCI)
                 quirk_usb_disable_ehci(pdev);
+        else if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI)
+                quirk_usb_handoff_xhci(pdev);
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, quirk_usb_early_handoff);
diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index f1626e58c141..56976cc0352a 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -46,31 +46,10 @@ MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Yoshihiro Shimoda");
 MODULE_ALIAS("platform:r8a66597_hcd");
 
-#define DRIVER_VERSION  "10 Apr 2008"
+#define DRIVER_VERSION  "2009-05-26"
 
 static const char hcd_name[] = "r8a66597_hcd";
 
-/* module parameters */
-#if !defined(CONFIG_SUPERH_ON_CHIP_R8A66597)
-static unsigned short clock = XTAL12;
-module_param(clock, ushort, 0644);
-MODULE_PARM_DESC(clock, "input clock: 48MHz=32768, 24MHz=16384, 12MHz=0 "
-                "(default=0)");
-#endif
-
-static unsigned short vif = LDRV;
-module_param(vif, ushort, 0644);
-MODULE_PARM_DESC(vif, "input VIF: 3.3V=32768, 1.5V=0(default=32768)");
-
-static unsigned short endian;
-module_param(endian, ushort, 0644);
-MODULE_PARM_DESC(endian, "data endian: big=256, little=0 (default=0)");
-
-static unsigned short irq_sense = 0xff;
-module_param(irq_sense, ushort, 0644);
-MODULE_PARM_DESC(irq_sense, "IRQ sense: low level=32, falling edge=0 "
-                "(default=32)");
-
 static void packet_write(struct r8a66597 *r8a66597, u16 pipenum);
 static int r8a66597_get_frame(struct usb_hcd *hcd);
 
@@ -136,7 +115,8 @@ static int r8a66597_clock_enable(struct r8a66597 *r8a66597)
                 }
         } while ((tmp & USBE) != USBE);
         r8a66597_bclr(r8a66597, USBE, SYSCFG0);
-        r8a66597_mdfy(r8a66597, clock, XTAL, SYSCFG0);
+        r8a66597_mdfy(r8a66597, get_xtal_from_pdata(r8a66597->pdata), XTAL,
+                        SYSCFG0);
 
         i = 0;
         r8a66597_bset(r8a66597, XCKE, SYSCFG0);
@@ -203,6 +183,9 @@ static void r8a66597_disable_port(struct r8a66597 *r8a66597, int port)
 static int enable_controller(struct r8a66597 *r8a66597)
 {
         int ret, port;
+        u16 vif = r8a66597->pdata->vif ? LDRV : 0;
+        u16 irq_sense = r8a66597->irq_sense_low ? INTL : 0;
+        u16 endian = r8a66597->pdata->endian ? BIGEND : 0;
 
         ret = r8a66597_clock_enable(r8a66597);
         if (ret < 0)
@@ -2373,7 +2356,7 @@ static int __init_or_module r8a66597_remove(struct platform_device *pdev)
         return 0;
 }
 
-static int __init r8a66597_probe(struct platform_device *pdev)
+static int __devinit r8a66597_probe(struct platform_device *pdev)
 {
 #if defined(CONFIG_SUPERH_ON_CHIP_R8A66597) && defined(CONFIG_HAVE_CLK)
         char clk_name[8];
@@ -2418,6 +2401,12 @@ static int __init r8a66597_probe(struct platform_device *pdev)
                 goto clean_up;
         }
 
+        if (pdev->dev.platform_data == NULL) {
+                dev_err(&pdev->dev, "no platform data\n");
+                ret = -ENODEV;
+                goto clean_up;
+        }
+
         /* initialize hcd */
         hcd = usb_create_hcd(&r8a66597_hc_driver, &pdev->dev, (char *)hcd_name);
         if (!hcd) {
@@ -2428,6 +2417,8 @@ static int __init r8a66597_probe(struct platform_device *pdev)
         r8a66597 = hcd_to_r8a66597(hcd);
         memset(r8a66597, 0, sizeof(struct r8a66597));
         dev_set_drvdata(&pdev->dev, r8a66597);
+        r8a66597->pdata = pdev->dev.platform_data;
+        r8a66597->irq_sense_low = irq_trigger == IRQF_TRIGGER_LOW;
 
 #if defined(CONFIG_SUPERH_ON_CHIP_R8A66597) && defined(CONFIG_HAVE_CLK)
         snprintf(clk_name, sizeof(clk_name), "usb%d", pdev->id);
@@ -2458,29 +2449,6 @@ static int __init r8a66597_probe(struct platform_device *pdev)
 
         hcd->rsrc_start = res->start;
 
-        /* irq_sense setting on cmdline takes precedence over resource
-         * settings, so the introduction of irqflags in IRQ resourse
-         * won't disturb existing setups */
-        switch (irq_sense) {
-                case INTL:
-                        irq_trigger = IRQF_TRIGGER_LOW;
-                        break;
-                case 0:
-                        irq_trigger = IRQF_TRIGGER_FALLING;
-                        break;
-                case 0xff:
-                        if (irq_trigger)
-                                irq_sense = (irq_trigger & IRQF_TRIGGER_LOW) ?
-                                            INTL : 0;
-                        else {
-                                irq_sense = INTL;
-                                irq_trigger = IRQF_TRIGGER_LOW;
-                        }
-                        break;
-                default:
-                        dev_err(&pdev->dev, "Unknown irq_sense value.\n");
-        }
-
         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | irq_trigger);
         if (ret != 0) {
                 dev_err(&pdev->dev, "Failed to add hcd\n");
diff --git a/drivers/usb/host/r8a66597.h b/drivers/usb/host/r8a66597.h
index f49208f1bb74..d72680b433f9 100644
--- a/drivers/usb/host/r8a66597.h
+++ b/drivers/usb/host/r8a66597.h
@@ -30,6 +30,8 @@
 #include <linux/clk.h>
 #endif
 
+#include <linux/usb/r8a66597.h>
+
 #define SYSCFG0         0x00
 #define SYSCFG1         0x02
 #define SYSSTS0         0x04
@@ -488,6 +490,7 @@ struct r8a66597 {
 #if defined(CONFIG_SUPERH_ON_CHIP_R8A66597) && defined(CONFIG_HAVE_CLK)
         struct clk *clk;
 #endif
+        struct r8a66597_platdata        *pdata;
         struct r8a66597_device          device0;
         struct r8a66597_root_hub        root_hub[R8A66597_MAX_ROOT_HUB];
         struct list_head                pipe_queue[R8A66597_MAX_NUM_PIPE];
@@ -506,6 +509,7 @@ struct r8a66597 {
         unsigned long child_connect_map[4];
 
         unsigned bus_suspended:1;
+        unsigned irq_sense_low:1;
 };
 
 static inline struct r8a66597 *hcd_to_r8a66597(struct usb_hcd *hcd)
@@ -660,10 +664,36 @@ static inline void r8a66597_port_power(struct r8a66597 *r8a66597, int port,
 {
         unsigned long dvstctr_reg = get_dvstctr_reg(port);
 
-        if (power)
-                r8a66597_bset(r8a66597, VBOUT, dvstctr_reg);
-        else
-                r8a66597_bclr(r8a66597, VBOUT, dvstctr_reg);
+        if (r8a66597->pdata->port_power) {
+                r8a66597->pdata->port_power(port, power);
+        } else {
+                if (power)
+                        r8a66597_bset(r8a66597, VBOUT, dvstctr_reg);
+                else
+                        r8a66597_bclr(r8a66597, VBOUT, dvstctr_reg);
+        }
+}
+
+static inline u16 get_xtal_from_pdata(struct r8a66597_platdata *pdata)
+{
+        u16 clock = 0;
+
+        switch (pdata->xtal) {
+        case R8A66597_PLATDATA_XTAL_12MHZ:
+                clock = XTAL12;
+                break;
+        case R8A66597_PLATDATA_XTAL_24MHZ:
+                clock = XTAL24;
+                break;
+        case R8A66597_PLATDATA_XTAL_48MHZ:
+                clock = XTAL48;
+                break;
+        default:
+                printk(KERN_ERR "r8a66597: platdata clock is wrong.\n");
+                break;
+        }
+
+        return clock;
 }
 
 #define get_pipectr_addr(pipenum)       (PIPE1CTR + (pipenum - 1) * 2)
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index cf5e4cf7ea42..274751b4409c 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -769,7 +769,7 @@ static int uhci_rh_resume(struct usb_hcd *hcd)
         return rc;
 }
 
-static int uhci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
+static int uhci_pci_suspend(struct usb_hcd *hcd)
 {
         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
         int rc = 0;
@@ -795,10 +795,6 @@ static int uhci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
 
         /* FIXME: Enable non-PME# remote wakeup? */
 
-        /* make sure snapshot being resumed re-enumerates everything */
-        if (message.event == PM_EVENT_PRETHAW)
-                uhci_hc_died(uhci);
-
 done_okay:
         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 done:
@@ -806,7 +802,7 @@ done:
         return rc;
 }
 
-static int uhci_pci_resume(struct usb_hcd *hcd)
+static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 {
         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 
@@ -820,6 +816,10 @@ static int uhci_pci_resume(struct usb_hcd *hcd)
 
         spin_lock_irq(&uhci->lock);
 
+        /* Make sure resume from hibernation re-enumerates everything */
+        if (hibernated)
+                uhci_hc_died(uhci);
+
         /* FIXME: Disable non-PME# remote wakeup? */
 
         /* The firmware or a boot kernel may have changed the controller
@@ -940,10 +940,11 @@ static struct pci_driver uhci_pci_driver = {
         .remove =       usb_hcd_pci_remove,
         .shutdown =     uhci_shutdown,
 
-#ifdef  CONFIG_PM
-        .suspend =      usb_hcd_pci_suspend,
-        .resume =       usb_hcd_pci_resume,
-#endif  /* PM */
+#ifdef CONFIG_PM_SLEEP
+        .driver =       {
+                .pm =   &usb_hcd_pci_pm_ops
+        },
+#endif
 };
  
 static int __init uhci_hcd_init(void)
@@ -961,7 +962,7 @@ static int __init uhci_hcd_init(void)
                 errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
                 if (!errbuf)
                         goto errbuf_failed;
-                uhci_debugfs_root = debugfs_create_dir("uhci", NULL);
+                uhci_debugfs_root = debugfs_create_dir("uhci", usb_debug_root);
                 if (!uhci_debugfs_root)
                         goto debug_failed;
         }
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index 3e5807d14ffb..64e57bfe236b 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -260,7 +260,7 @@ static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci,
         INIT_LIST_HEAD(&qh->node);
 
         if (udev) {             /* Normal QH */
-                qh->type = hep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+                qh->type = usb_endpoint_type(&hep->desc);
                 if (qh->type != USB_ENDPOINT_XFER_ISOC) {
                         qh->dummy_td = uhci_alloc_td(uhci);
                         if (!qh->dummy_td) {
diff --git a/drivers/usb/host/xhci-dbg.c b/drivers/usb/host/xhci-dbg.c
new file mode 100644
index 000000000000..2501c571f855
--- /dev/null
+++ b/drivers/usb/host/xhci-dbg.c
@@ -0,0 +1,485 @@
+/*
+ * xHCI host controller driver
+ *
+ * Copyright (C) 2008 Intel Corp.
+ *
+ * Author: Sarah Sharp
+ * Some code borrowed from the Linux EHCI driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "xhci.h"
+
+#define XHCI_INIT_VALUE 0x0
+
+/* Add verbose debugging later, just print everything for now */
+
+void xhci_dbg_regs(struct xhci_hcd *xhci)
+{
+        u32 temp;
+
+        xhci_dbg(xhci, "// xHCI capability registers at %p:\n",
+                        xhci->cap_regs);
+        temp = xhci_readl(xhci, &xhci->cap_regs->hc_capbase);
+        xhci_dbg(xhci, "// @%p = 0x%x (CAPLENGTH AND HCIVERSION)\n",
+                        &xhci->cap_regs->hc_capbase, temp);
+        xhci_dbg(xhci, "//   CAPLENGTH: 0x%x\n",
+                        (unsigned int) HC_LENGTH(temp));
+#if 0
+        xhci_dbg(xhci, "//   HCIVERSION: 0x%x\n",
+                        (unsigned int) HC_VERSION(temp));
+#endif
+
+        xhci_dbg(xhci, "// xHCI operational registers at %p:\n", xhci->op_regs);
+
+        temp = xhci_readl(xhci, &xhci->cap_regs->run_regs_off);
+        xhci_dbg(xhci, "// @%p = 0x%x RTSOFF\n",
+                        &xhci->cap_regs->run_regs_off,
+                        (unsigned int) temp & RTSOFF_MASK);
+        xhci_dbg(xhci, "// xHCI runtime registers at %p:\n", xhci->run_regs);
+
+        temp = xhci_readl(xhci, &xhci->cap_regs->db_off);
+        xhci_dbg(xhci, "// @%p = 0x%x DBOFF\n", &xhci->cap_regs->db_off, temp);
+        xhci_dbg(xhci, "// Doorbell array at %p:\n", xhci->dba);
+}
+
+static void xhci_print_cap_regs(struct xhci_hcd *xhci)
+{
+        u32 temp;
+
+        xhci_dbg(xhci, "xHCI capability registers at %p:\n", xhci->cap_regs);
+
+        temp = xhci_readl(xhci, &xhci->cap_regs->hc_capbase);
+        xhci_dbg(xhci, "CAPLENGTH AND HCIVERSION 0x%x:\n",
+                        (unsigned int) temp);
+        xhci_dbg(xhci, "CAPLENGTH: 0x%x\n",
+                        (unsigned int) HC_LENGTH(temp));
+        xhci_dbg(xhci, "HCIVERSION: 0x%x\n",
+                        (unsigned int) HC_VERSION(temp));
+
+        temp = xhci_readl(xhci, &xhci->cap_regs->hcs_params1);
+        xhci_dbg(xhci, "HCSPARAMS 1: 0x%x\n",
+                        (unsigned int) temp);
+        xhci_dbg(xhci, "  Max device slots: %u\n",
+                        (unsigned int) HCS_MAX_SLOTS(temp));
+        xhci_dbg(xhci, "  Max interrupters: %u\n",
+                        (unsigned int) HCS_MAX_INTRS(temp));
+        xhci_dbg(xhci, "  Max ports: %u\n",
+                        (unsigned int) HCS_MAX_PORTS(temp));
+
+        temp = xhci_readl(xhci, &xhci->cap_regs->hcs_params2);
+        xhci_dbg(xhci, "HCSPARAMS 2: 0x%x\n",
+                        (unsigned int) temp);
+        xhci_dbg(xhci, "  Isoc scheduling threshold: %u\n",
+                        (unsigned int) HCS_IST(temp));
+        xhci_dbg(xhci, "  Maximum allowed segments in event ring: %u\n",
+                        (unsigned int) HCS_ERST_MAX(temp));
+
+        temp = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
+        xhci_dbg(xhci, "HCSPARAMS 3 0x%x:\n",
+                        (unsigned int) temp);
+        xhci_dbg(xhci, "  Worst case U1 device exit latency: %u\n",
+                        (unsigned int) HCS_U1_LATENCY(temp));
+        xhci_dbg(xhci, "  Worst case U2 device exit latency: %u\n",
+                        (unsigned int) HCS_U2_LATENCY(temp));
+
+        temp = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
+        xhci_dbg(xhci, "HCC PARAMS 0x%x:\n", (unsigned int) temp);
+        xhci_dbg(xhci, "  HC generates %s bit addresses\n",
+                        HCC_64BIT_ADDR(temp) ? "64" : "32");
+        /* FIXME */
+        xhci_dbg(xhci, "  FIXME: more HCCPARAMS debugging\n");
+
+        temp = xhci_readl(xhci, &xhci->cap_regs->run_regs_off);
+        xhci_dbg(xhci, "RTSOFF 0x%x:\n", temp & RTSOFF_MASK);
+}
+
+static void xhci_print_command_reg(struct xhci_hcd *xhci)
+{
+        u32 temp;
+
+        temp = xhci_readl(xhci, &xhci->op_regs->command);
+        xhci_dbg(xhci, "USBCMD 0x%x:\n", temp);
+        xhci_dbg(xhci, "  HC is %s\n",
+                        (temp & CMD_RUN) ? "running" : "being stopped");
+        xhci_dbg(xhci, "  HC has %sfinished hard reset\n",
+                        (temp & CMD_RESET) ? "not " : "");
+        xhci_dbg(xhci, "  Event Interrupts %s\n",
+                        (temp & CMD_EIE) ? "enabled " : "disabled");
+        xhci_dbg(xhci, "  Host System Error Interrupts %s\n",
+                        (temp & CMD_EIE) ? "enabled " : "disabled");
+        xhci_dbg(xhci, "  HC has %sfinished light reset\n",
+                        (temp & CMD_LRESET) ? "not " : "");
+}
+
+static void xhci_print_status(struct xhci_hcd *xhci)
+{
+        u32 temp;
+
+        temp = xhci_readl(xhci, &xhci->op_regs->status);
+        xhci_dbg(xhci, "USBSTS 0x%x:\n", temp);
+        xhci_dbg(xhci, "  Event ring is %sempty\n",
+                        (temp & STS_EINT) ? "not " : "");
+        xhci_dbg(xhci, "  %sHost System Error\n",
+                        (temp & STS_FATAL) ? "WARNING: " : "No ");
+        xhci_dbg(xhci, "  HC is %s\n",
+                        (temp & STS_HALT) ? "halted" : "running");
+}
+
+static void xhci_print_op_regs(struct xhci_hcd *xhci)
+{
+        xhci_dbg(xhci, "xHCI operational registers at %p:\n", xhci->op_regs);
+        xhci_print_command_reg(xhci);
+        xhci_print_status(xhci);
+}
+
+static void xhci_print_ports(struct xhci_hcd *xhci)
+{
+        u32 __iomem *addr;
+        int i, j;
+        int ports;
+        char *names[NUM_PORT_REGS] = {
+                "status",
+                "power",
+                "link",
+                "reserved",
+        };
+
+        ports = HCS_MAX_PORTS(xhci->hcs_params1);
+        addr = &xhci->op_regs->port_status_base;
+        for (i = 0; i < ports; i++) {
+                for (j = 0; j < NUM_PORT_REGS; ++j) {
+                        xhci_dbg(xhci, "%p port %s reg = 0x%x\n",
+                                        addr, names[j],
+                                        (unsigned int) xhci_readl(xhci, addr));
+                        addr++;
+                }
+        }
+}
+
+void xhci_print_ir_set(struct xhci_hcd *xhci, struct xhci_intr_reg *ir_set, int set_num)
+{
+        void *addr;
+        u32 temp;
+
+        addr = &ir_set->irq_pending;
+        temp = xhci_readl(xhci, addr);
+        if (temp == XHCI_INIT_VALUE)
+                return;
+
+        xhci_dbg(xhci, "  %p: ir_set[%i]\n", ir_set, set_num);
+
+        xhci_dbg(xhci, "  %p: ir_set.pending = 0x%x\n", addr,
+                        (unsigned int)temp);
+
+        addr = &ir_set->irq_control;
+        temp = xhci_readl(xhci, addr);
+        xhci_dbg(xhci, "  %p: ir_set.control = 0x%x\n", addr,
+                        (unsigned int)temp);
+
+        addr = &ir_set->erst_size;
+        temp = xhci_readl(xhci, addr);
+        xhci_dbg(xhci, "  %p: ir_set.erst_size = 0x%x\n", addr,
+                        (unsigned int)temp);
+
+        addr = &ir_set->rsvd;
+        temp = xhci_readl(xhci, addr);
+        if (temp != XHCI_INIT_VALUE)
+                xhci_dbg(xhci, "  WARN: %p: ir_set.rsvd = 0x%x\n",
+                                addr, (unsigned int)temp);
+
+        addr = &ir_set->erst_base[0];
+        temp = xhci_readl(xhci, addr);
+        xhci_dbg(xhci, "  %p: ir_set.erst_base[0] = 0x%x\n",
+                        addr, (unsigned int) temp);
+
+        addr = &ir_set->erst_base[1];
+        temp = xhci_readl(xhci, addr);
+        xhci_dbg(xhci, "  %p: ir_set.erst_base[1] = 0x%x\n",
+                        addr, (unsigned int) temp);
+
+        addr = &ir_set->erst_dequeue[0];
+        temp = xhci_readl(xhci, addr);
+        xhci_dbg(xhci, "  %p: ir_set.erst_dequeue[0] = 0x%x\n",
+                        addr, (unsigned int) temp);
+
+        addr = &ir_set->erst_dequeue[1];
+        temp = xhci_readl(xhci, addr);
+        xhci_dbg(xhci, "  %p: ir_set.erst_dequeue[1] = 0x%x\n",
+                        addr, (unsigned int) temp);
+}
+
+void xhci_print_run_regs(struct xhci_hcd *xhci)
+{
+        u32 temp;
+        int i;
+
+        xhci_dbg(xhci, "xHCI runtime registers at %p:\n", xhci->run_regs);
+        temp = xhci_readl(xhci, &xhci->run_regs->microframe_index);
+        xhci_dbg(xhci, "  %p: Microframe index = 0x%x\n",
+                        &xhci->run_regs->microframe_index,
+                        (unsigned int) temp);
+        for (i = 0; i < 7; ++i) {
+                temp = xhci_readl(xhci, &xhci->run_regs->rsvd[i]);
+                if (temp != XHCI_INIT_VALUE)
+                        xhci_dbg(xhci, "  WARN: %p: Rsvd[%i] = 0x%x\n",
+                                        &xhci->run_regs->rsvd[i],
+                                        i, (unsigned int) temp);
+        }
+}
+
+void xhci_print_registers(struct xhci_hcd *xhci)
+{
+        xhci_print_cap_regs(xhci);
+        xhci_print_op_regs(xhci);
+        xhci_print_ports(xhci);
+}
+
+void xhci_print_trb_offsets(struct xhci_hcd *xhci, union xhci_trb *trb)
+{
+        int i;
+        for (i = 0; i < 4; ++i)
+                xhci_dbg(xhci, "Offset 0x%x = 0x%x\n",
+                                i*4, trb->generic.field[i]);
+}
+
+/**
+ * Debug a transfer request block (TRB).
+ */
+void xhci_debug_trb(struct xhci_hcd *xhci, union xhci_trb *trb)
+{
+        u64     address;
+        u32     type = xhci_readl(xhci, &trb->link.control) & TRB_TYPE_BITMASK;
+
+        switch (type) {
+        case TRB_TYPE(TRB_LINK):
+                xhci_dbg(xhci, "Link TRB:\n");
+                xhci_print_trb_offsets(xhci, trb);
+
+                address = trb->link.segment_ptr[0] +
+                        (((u64) trb->link.segment_ptr[1]) << 32);
+                xhci_dbg(xhci, "Next ring segment DMA address = 0x%llx\n", address);
+
+                xhci_dbg(xhci, "Interrupter target = 0x%x\n",
+                                GET_INTR_TARGET(trb->link.intr_target));
+                xhci_dbg(xhci, "Cycle bit = %u\n",
+                                (unsigned int) (trb->link.control & TRB_CYCLE));
+                xhci_dbg(xhci, "Toggle cycle bit = %u\n",
+                                (unsigned int) (trb->link.control & LINK_TOGGLE));
+                xhci_dbg(xhci, "No Snoop bit = %u\n",
+                                (unsigned int) (trb->link.control & TRB_NO_SNOOP));
+                break;
+        case TRB_TYPE(TRB_TRANSFER):
+                address = trb->trans_event.buffer[0] +
+                        (((u64) trb->trans_event.buffer[1]) << 32);
+                /*
+                 * FIXME: look at flags to figure out if it's an address or if
+                 * the data is directly in the buffer field.
+                 */
+                xhci_dbg(xhci, "DMA address or buffer contents= %llu\n", address);
+                break;
+        case TRB_TYPE(TRB_COMPLETION):
+                address = trb->event_cmd.cmd_trb[0] +
+                        (((u64) trb->event_cmd.cmd_trb[1]) << 32);
+                xhci_dbg(xhci, "Command TRB pointer = %llu\n", address);
+                xhci_dbg(xhci, "Completion status = %u\n",
+                                (unsigned int) GET_COMP_CODE(trb->event_cmd.status));
+                xhci_dbg(xhci, "Flags = 0x%x\n", (unsigned int) trb->event_cmd.flags);
+                break;
+        default:
+                xhci_dbg(xhci, "Unknown TRB with TRB type ID %u\n",
+                                (unsigned int) type>>10);
+                xhci_print_trb_offsets(xhci, trb);
+                break;
+        }
+}
+
+/**
+ * Debug a segment with an xHCI ring.
+ *
+ * @return The Link TRB of the segment, or NULL if there is no Link TRB
+ * (which is a bug, since all segments must have a Link TRB).
+ *
+ * Prints out all TRBs in the segment, even those after the Link TRB.
+ *
+ * XXX: should we print out TRBs that the HC owns?  As long as we don't
+ * write, that should be fine...  We shouldn't expect that the memory pointed to
+ * by the TRB is valid at all.  Do we care about ones the HC owns?  Probably,
+ * for HC debugging.
+ */
+void xhci_debug_segment(struct xhci_hcd *xhci, struct xhci_segment *seg)
+{
+        int i;
+        u32 addr = (u32) seg->dma;
+        union xhci_trb *trb = seg->trbs;
+
+        for (i = 0; i < TRBS_PER_SEGMENT; ++i) {
+                trb = &seg->trbs[i];
+                xhci_dbg(xhci, "@%08x %08x %08x %08x %08x\n", addr,
+                                (unsigned int) trb->link.segment_ptr[0],
+                                (unsigned int) trb->link.segment_ptr[1],
+                                (unsigned int) trb->link.intr_target,
+                                (unsigned int) trb->link.control);
+                addr += sizeof(*trb);
+        }
+}
+
+void xhci_dbg_ring_ptrs(struct xhci_hcd *xhci, struct xhci_ring *ring)
+{
+        xhci_dbg(xhci, "Ring deq = %p (virt), 0x%llx (dma)\n",
+                        ring->dequeue,
+                        (unsigned long long)xhci_trb_virt_to_dma(ring->deq_seg,
+                                                            ring->dequeue));
+        xhci_dbg(xhci, "Ring deq updated %u times\n",
+                        ring->deq_updates);
+        xhci_dbg(xhci, "Ring enq = %p (virt), 0x%llx (dma)\n",
+                        ring->enqueue,
+                        (unsigned long long)xhci_trb_virt_to_dma(ring->enq_seg,
+                                                            ring->enqueue));
+        xhci_dbg(xhci, "Ring enq updated %u times\n",
+                        ring->enq_updates);
+}
+
+/**
+ * Debugging for an xHCI ring, which is a queue broken into multiple segments.
+ *
+ * Print out each segment in the ring.  Check that the DMA address in
+ * each link segment actually matches the segment's stored DMA address.
+ * Check that the link end bit is only set at the end of the ring.
+ * Check that the dequeue and enqueue pointers point to real data in this ring
+ * (not some other ring).
+ */
+void xhci_debug_ring(struct xhci_hcd *xhci, struct xhci_ring *ring)
+{
+        /* FIXME: Throw an error if any segment doesn't have a Link TRB */
+        struct xhci_segment *seg;
+        struct xhci_segment *first_seg = ring->first_seg;
+        xhci_debug_segment(xhci, first_seg);
+
+        if (!ring->enq_updates && !ring->deq_updates) {
+                xhci_dbg(xhci, "  Ring has not been updated\n");
+                return;
+        }
+        for (seg = first_seg->next; seg != first_seg; seg = seg->next)
+                xhci_debug_segment(xhci, seg);
+}
+
+void xhci_dbg_erst(struct xhci_hcd *xhci, struct xhci_erst *erst)
+{
+        u32 addr = (u32) erst->erst_dma_addr;
+        int i;
+        struct xhci_erst_entry *entry;
+
+        for (i = 0; i < erst->num_entries; ++i) {
+                entry = &erst->entries[i];
+                xhci_dbg(xhci, "@%08x %08x %08x %08x %08x\n",
+                                (unsigned int) addr,
+                                (unsigned int) entry->seg_addr[0],
+                                (unsigned int) entry->seg_addr[1],
+                                (unsigned int) entry->seg_size,
+                                (unsigned int) entry->rsvd);
+                addr += sizeof(*entry);
+        }
+}
+
+void xhci_dbg_cmd_ptrs(struct xhci_hcd *xhci)
+{
+        u32 val;
+
+        val = xhci_readl(xhci, &xhci->op_regs->cmd_ring[0]);
+        xhci_dbg(xhci, "// xHC command ring deq ptr low bits + flags = 0x%x\n", val);
+        val = xhci_readl(xhci, &xhci->op_regs->cmd_ring[1]);
+        xhci_dbg(xhci, "// xHC command ring deq ptr high bits = 0x%x\n", val);
+}
+
+void xhci_dbg_ctx(struct xhci_hcd *xhci, struct xhci_device_control *ctx, dma_addr_t dma, unsigned int last_ep)
+{
+        int i, j;
+        int last_ep_ctx = 31;
+        /* Fields are 32 bits wide, DMA addresses are in bytes */
+        int field_size = 32 / 8;
+
+        xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - drop flags\n",
+                        &ctx->drop_flags, (unsigned long long)dma,
+                        ctx->drop_flags);
+        dma += field_size;
+        xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - add flags\n",
+                        &ctx->add_flags, (unsigned long long)dma,
+                        ctx->add_flags);
+        dma += field_size;
+        for (i = 0; i > 6; ++i) {
+                xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - rsvd[%d]\n",
+                                &ctx->rsvd[i], (unsigned long long)dma,
+                                ctx->rsvd[i], i);
+                dma += field_size;
+        }
+
+        xhci_dbg(xhci, "Slot Context:\n");
+        xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - dev_info\n",
+                        &ctx->slot.dev_info,
+                        (unsigned long long)dma, ctx->slot.dev_info);
+        dma += field_size;
+        xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - dev_info2\n",
+                        &ctx->slot.dev_info2,
+                        (unsigned long long)dma, ctx->slot.dev_info2);
+        dma += field_size;
+        xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - tt_info\n",
+                        &ctx->slot.tt_info,
+                        (unsigned long long)dma, ctx->slot.tt_info);
+        dma += field_size;
+        xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - dev_state\n",
+                        &ctx->slot.dev_state,
+                        (unsigned long long)dma, ctx->slot.dev_state);
+        dma += field_size;
+        for (i = 0; i > 4; ++i) {
+                xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - rsvd[%d]\n",
+                                &ctx->slot.reserved[i], (unsigned long long)dma,
+                                ctx->slot.reserved[i], i);
+                dma += field_size;
+        }
+
+        if (last_ep < 31)
+                last_ep_ctx = last_ep + 1;
+        for (i = 0; i < last_ep_ctx; ++i) {
+                xhci_dbg(xhci, "Endpoint %02d Context:\n", i);
+                xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - ep_info\n",
+                                &ctx->ep[i].ep_info,
+                                (unsigned long long)dma, ctx->ep[i].ep_info);
+                dma += field_size;
+                xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - ep_info2\n",
+                                &ctx->ep[i].ep_info2,
+                                (unsigned long long)dma, ctx->ep[i].ep_info2);
+                dma += field_size;
+                xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - deq[0]\n",
+                                &ctx->ep[i].deq[0],
+                                (unsigned long long)dma, ctx->ep[i].deq[0]);
+                dma += field_size;
+                xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - deq[1]\n",
+                                &ctx->ep[i].deq[1],
+                                (unsigned long long)dma, ctx->ep[i].deq[1]);
+                dma += field_size;
+                xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - tx_info\n",
+                                &ctx->ep[i].tx_info,
+                                (unsigned long long)dma, ctx->ep[i].tx_info);
+                dma += field_size;
+                for (j = 0; j < 3; ++j) {
+                        xhci_dbg(xhci, "@%p (virt) @%08llx (dma) %#08x - rsvd[%d]\n",
+                                        &ctx->ep[i].reserved[j],
+                                        (unsigned long long)dma,
+                                        ctx->ep[i].reserved[j], j);
+                        dma += field_size;
+                }
+        }
+}
diff --git a/drivers/usb/host/xhci-ext-caps.h b/drivers/usb/host/xhci-ext-caps.h
new file mode 100644
index 000000000000..ecc131c3fe33
--- /dev/null
+++ b/drivers/usb/host/xhci-ext-caps.h
@@ -0,0 +1,145 @@
+/*
+ * xHCI host controller driver
+ *
+ * Copyright (C) 2008 Intel Corp.
+ *
+ * Author: Sarah Sharp
+ * Some code borrowed from the Linux EHCI driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/* Up to 16 microframes to halt an HC - one microframe is 125 microsectonds */
+#define XHCI_MAX_HALT_USEC      (16*125)
+/* HC not running - set to 1 when run/stop bit is cleared. */
+#define XHCI_STS_HALT           (1<<0)
+
+/* HCCPARAMS offset from PCI base address */
+#define XHCI_HCC_PARAMS_OFFSET  0x10
+/* HCCPARAMS contains the first extended capability pointer */
+#define XHCI_HCC_EXT_CAPS(p)    (((p)>>16)&0xffff)
+
+/* Command and Status registers offset from the Operational Registers address */
+#define XHCI_CMD_OFFSET         0x00
+#define XHCI_STS_OFFSET         0x04
+
+#define XHCI_MAX_EXT_CAPS               50
+
+/* Capability Register */
+/* bits 7:0 - how long is the Capabilities register */
+#define XHCI_HC_LENGTH(p)       (((p)>>00)&0x00ff)
+
+/* Extended capability register fields */
+#define XHCI_EXT_CAPS_ID(p)     (((p)>>0)&0xff)
+#define XHCI_EXT_CAPS_NEXT(p)   (((p)>>8)&0xff)
+#define XHCI_EXT_CAPS_VAL(p)    ((p)>>16)
+/* Extended capability IDs - ID 0 reserved */
+#define XHCI_EXT_CAPS_LEGACY    1
+#define XHCI_EXT_CAPS_PROTOCOL  2
+#define XHCI_EXT_CAPS_PM        3
+#define XHCI_EXT_CAPS_VIRT      4
+#define XHCI_EXT_CAPS_ROUTE     5
+/* IDs 6-9 reserved */
+#define XHCI_EXT_CAPS_DEBUG     10
+/* USB Legacy Support Capability - section 7.1.1 */
+#define XHCI_HC_BIOS_OWNED      (1 << 16)
+#define XHCI_HC_OS_OWNED        (1 << 24)
+
+/* USB Legacy Support Capability - section 7.1.1 */
+/* Add this offset, plus the value of xECP in HCCPARAMS to the base address */
+#define XHCI_LEGACY_SUPPORT_OFFSET      (0x00)
+
+/* USB Legacy Support Control and Status Register  - section 7.1.2 */
+/* Add this offset, plus the value of xECP in HCCPARAMS to the base address */
+#define XHCI_LEGACY_CONTROL_OFFSET      (0x04)
+/* bits 1:2, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */
+#define XHCI_LEGACY_DISABLE_SMI         ((0x3 << 1) + (0xff << 5) + (0x7 << 17))
+
+/* command register values to disable interrupts and halt the HC */
+/* start/stop HC execution - do not write unless HC is halted*/
+#define XHCI_CMD_RUN            (1 << 0)
+/* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */
+#define XHCI_CMD_EIE            (1 << 2)
+/* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */
+#define XHCI_CMD_HSEIE          (1 << 3)
+/* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
+#define XHCI_CMD_EWE            (1 << 10)
+
+#define XHCI_IRQS               (XHCI_CMD_EIE | XHCI_CMD_HSEIE | XHCI_CMD_EWE)
+
+/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
+#define XHCI_STS_CNR            (1 << 11)
+
+#include <linux/io.h>
+
+/**
+ * Return the next extended capability pointer register.
+ *
+ * @base        PCI register base address.
+ *
+ * @ext_offset  Offset of the 32-bit register that contains the extended
+ * capabilites pointer.  If searching for the first extended capability, pass
+ * in XHCI_HCC_PARAMS_OFFSET.  If searching for the next extended capability,
+ * pass in the offset of the current extended capability register.
+ *
+ * Returns 0 if there is no next extended capability register or returns the register offset
+ * from the PCI registers base address.
+ */
+static inline int xhci_find_next_cap_offset(void __iomem *base, int ext_offset)
+{
+        u32 next;
+
+        next = readl(base + ext_offset);
+
+        if (ext_offset == XHCI_HCC_PARAMS_OFFSET)
+                /* Find the first extended capability */
+                next = XHCI_HCC_EXT_CAPS(next);
+        else
+                /* Find the next extended capability */
+                next = XHCI_EXT_CAPS_NEXT(next);
+        if (!next)
+                return 0;
+        /*
+         * Address calculation from offset of extended capabilities
+         * (or HCCPARAMS) register - see section 5.3.6 and section 7.
+         */
+        return ext_offset + (next << 2);
+}
+
+/**
+ * Find the offset of the extended capabilities with capability ID id.
+ *
+ * @base PCI MMIO registers base address.
+ * @ext_offset Offset from base of the first extended capability to look at,
+ *              or the address of HCCPARAMS.
+ * @id Extended capability ID to search for.
+ *
+ * This uses an arbitrary limit of XHCI_MAX_EXT_CAPS extended capabilities
+ * to make sure that the list doesn't contain a loop.
+ */
+static inline int xhci_find_ext_cap_by_id(void __iomem *base, int ext_offset, int id)
+{
+        u32 val;
+        int limit = XHCI_MAX_EXT_CAPS;
+
+        while (ext_offset && limit > 0) {
+                val = readl(base + ext_offset);
+                if (XHCI_EXT_CAPS_ID(val) == id)
+                        break;
+                ext_offset = xhci_find_next_cap_offset(base, ext_offset);
+                limit--;
+        }
+        if (limit > 0)
+                return ext_offset;
+        return 0;
+}
diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c
new file mode 100644
index 000000000000..dba3e07ccd09
--- /dev/null
+++ b/drivers/usb/host/xhci-hcd.c
@@ -0,0 +1,1274 @@
+/*
+ * xHCI host controller driver
+ *
+ * Copyright (C) 2008 Intel Corp.
+ *
+ * Author: Sarah Sharp
+ * Some code borrowed from the Linux EHCI driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+
+#include "xhci.h"
+
+#define DRIVER_AUTHOR "Sarah Sharp"
+#define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
+
+/* TODO: copied from ehci-hcd.c - can this be refactored? */
+/*
+ * handshake - spin reading hc until handshake completes or fails
+ * @ptr: address of hc register to be read
+ * @mask: bits to look at in result of read
+ * @done: value of those bits when handshake succeeds
+ * @usec: timeout in microseconds
+ *
+ * Returns negative errno, or zero on success
+ *
+ * Success happens when the "mask" bits have the specified value (hardware
+ * handshake done).  There are two failure modes:  "usec" have passed (major
+ * hardware flakeout), or the register reads as all-ones (hardware removed).
+ */
+static int handshake(struct xhci_hcd *xhci, void __iomem *ptr,
+                      u32 mask, u32 done, int usec)
+{
+        u32     result;
+
+        do {
+                result = xhci_readl(xhci, ptr);
+                if (result == ~(u32)0)          /* card removed */
+                        return -ENODEV;
+                result &= mask;
+                if (result == done)
+                        return 0;
+                udelay(1);
+                usec--;
+        } while (usec > 0);
+        return -ETIMEDOUT;
+}
+
+/*
+ * Force HC into halt state.
+ *
+ * Disable any IRQs and clear the run/stop bit.
+ * HC will complete any current and actively pipelined transactions, and
+ * should halt within 16 microframes of the run/stop bit being cleared.
+ * Read HC Halted bit in the status register to see when the HC is finished.
+ * XXX: shouldn't we set HC_STATE_HALT here somewhere?
+ */
+int xhci_halt(struct xhci_hcd *xhci)
+{
+        u32 halted;
+        u32 cmd;
+        u32 mask;
+
+        xhci_dbg(xhci, "// Halt the HC\n");
+        /* Disable all interrupts from the host controller */
+        mask = ~(XHCI_IRQS);
+        halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT;
+        if (!halted)
+                mask &= ~CMD_RUN;
+
+        cmd = xhci_readl(xhci, &xhci->op_regs->command);
+        cmd &= mask;
+        xhci_writel(xhci, cmd, &xhci->op_regs->command);
+
+        return handshake(xhci, &xhci->op_regs->status,
+                        STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
+}
+
+/*
+ * Reset a halted HC, and set the internal HC state to HC_STATE_HALT.
+ *
+ * This resets pipelines, timers, counters, state machines, etc.
+ * Transactions will be terminated immediately, and operational registers
+ * will be set to their defaults.
+ */
+int xhci_reset(struct xhci_hcd *xhci)
+{
+        u32 command;
+        u32 state;
+
+        state = xhci_readl(xhci, &xhci->op_regs->status);
+        BUG_ON((state & STS_HALT) == 0);
+
+        xhci_dbg(xhci, "// Reset the HC\n");
+        command = xhci_readl(xhci, &xhci->op_regs->command);
+        command |= CMD_RESET;
+        xhci_writel(xhci, command, &xhci->op_regs->command);
+        /* XXX: Why does EHCI set this here?  Shouldn't other code do this? */
+        xhci_to_hcd(xhci)->state = HC_STATE_HALT;
+
+        return handshake(xhci, &xhci->op_regs->command, CMD_RESET, 0, 250 * 1000);
+}
+
+/*
+ * Stop the HC from processing the endpoint queues.
+ */
+static void xhci_quiesce(struct xhci_hcd *xhci)
+{
+        /*
+         * Queues are per endpoint, so we need to disable an endpoint or slot.
+         *
+         * To disable a slot, we need to insert a disable slot command on the
+         * command ring and ring the doorbell.  This will also free any internal
+         * resources associated with the slot (which might not be what we want).
+         *
+         * A Release Endpoint command sounds better - doesn't free internal HC
+         * memory, but removes the endpoints from the schedule and releases the
+         * bandwidth, disables the doorbells, and clears the endpoint enable
+         * flag.  Usually used prior to a set interface command.
+         *
+         * TODO: Implement after command ring code is done.
+         */
+        BUG_ON(!HC_IS_RUNNING(xhci_to_hcd(xhci)->state));
+        xhci_dbg(xhci, "Finished quiescing -- code not written yet\n");
+}
+
+#if 0
+/* Set up MSI-X table for entry 0 (may claim other entries later) */
+static int xhci_setup_msix(struct xhci_hcd *xhci)
+{
+        int ret;
+        struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
+
+        xhci->msix_count = 0;
+        /* XXX: did I do this right?  ixgbe does kcalloc for more than one */
+        xhci->msix_entries = kmalloc(sizeof(struct msix_entry), GFP_KERNEL);
+        if (!xhci->msix_entries) {
+                xhci_err(xhci, "Failed to allocate MSI-X entries\n");
+                return -ENOMEM;
+        }
+        xhci->msix_entries[0].entry = 0;
+
+        ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
+        if (ret) {
+                xhci_err(xhci, "Failed to enable MSI-X\n");
+                goto free_entries;
+        }
+
+        /*
+         * Pass the xhci pointer value as the request_irq "cookie".
+         * If more irqs are added, this will need to be unique for each one.
+         */
+        ret = request_irq(xhci->msix_entries[0].vector, &xhci_irq, 0,
+                        "xHCI", xhci_to_hcd(xhci));
+        if (ret) {
+                xhci_err(xhci, "Failed to allocate MSI-X interrupt\n");
+                goto disable_msix;
+        }
+        xhci_dbg(xhci, "Finished setting up MSI-X\n");
+        return 0;
+
+disable_msix:
+        pci_disable_msix(pdev);
+free_entries:
+        kfree(xhci->msix_entries);
+        xhci->msix_entries = NULL;
+        return ret;
+}
+
+/* XXX: code duplication; can xhci_setup_msix call this? */
+/* Free any IRQs and disable MSI-X */
+static void xhci_cleanup_msix(struct xhci_hcd *xhci)
+{
+        struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
+        if (!xhci->msix_entries)
+                return;
+
+        free_irq(xhci->msix_entries[0].vector, xhci);
+        pci_disable_msix(pdev);
+        kfree(xhci->msix_entries);
+        xhci->msix_entries = NULL;
+        xhci_dbg(xhci, "Finished cleaning up MSI-X\n");
+}
+#endif
+
+/*
+ * Initialize memory for HCD and xHC (one-time init).
+ *
+ * Program the PAGESIZE register, initialize the device context array, create
+ * device contexts (?), set up a command ring segment (or two?), create event
+ * ring (one for now).
+ */
+int xhci_init(struct usb_hcd *hcd)
+{
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        int retval = 0;
+
+        xhci_dbg(xhci, "xhci_init\n");
+        spin_lock_init(&xhci->lock);
+        retval = xhci_mem_init(xhci, GFP_KERNEL);
+        xhci_dbg(xhci, "Finished xhci_init\n");
+
+        return retval;
+}
+
+/*
+ * Called in interrupt context when there might be work
+ * queued on the event ring
+ *
+ * xhci->lock must be held by caller.
+ */
+static void xhci_work(struct xhci_hcd *xhci)
+{
+        u32 temp;
+
+        /*
+         * Clear the op reg interrupt status first,
+         * so we can receive interrupts from other MSI-X interrupters.
+         * Write 1 to clear the interrupt status.
+         */
+        temp = xhci_readl(xhci, &xhci->op_regs->status);
+        temp |= STS_EINT;
+        xhci_writel(xhci, temp, &xhci->op_regs->status);
+        /* FIXME when MSI-X is supported and there are multiple vectors */
+        /* Clear the MSI-X event interrupt status */
+
+        /* Acknowledge the interrupt */
+        temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+        temp |= 0x3;
+        xhci_writel(xhci, temp, &xhci->ir_set->irq_pending);
+        /* Flush posted writes */
+        xhci_readl(xhci, &xhci->ir_set->irq_pending);
+
+        /* FIXME this should be a delayed service routine that clears the EHB */
+        xhci_handle_event(xhci);
+
+        /* Clear the event handler busy flag; the event ring should be empty. */
+        temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
+        xhci_writel(xhci, temp & ~ERST_EHB, &xhci->ir_set->erst_dequeue[0]);
+        /* Flush posted writes -- FIXME is this necessary? */
+        xhci_readl(xhci, &xhci->ir_set->irq_pending);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * xHCI spec says we can get an interrupt, and if the HC has an error condition,
+ * we might get bad data out of the event ring.  Section 4.10.2.7 has a list of
+ * indicators of an event TRB error, but we check the status *first* to be safe.
+ */
+irqreturn_t xhci_irq(struct usb_hcd *hcd)
+{
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        u32 temp, temp2;
+
+        spin_lock(&xhci->lock);
+        /* Check if the xHC generated the interrupt, or the irq is shared */
+        temp = xhci_readl(xhci, &xhci->op_regs->status);
+        temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+        if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
+                spin_unlock(&xhci->lock);
+                return IRQ_NONE;
+        }
+
+        if (temp & STS_FATAL) {
+                xhci_warn(xhci, "WARNING: Host System Error\n");
+                xhci_halt(xhci);
+                xhci_to_hcd(xhci)->state = HC_STATE_HALT;
+                spin_unlock(&xhci->lock);
+                return -ESHUTDOWN;
+        }
+
+        xhci_work(xhci);
+        spin_unlock(&xhci->lock);
+
+        return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+void xhci_event_ring_work(unsigned long arg)
+{
+        unsigned long flags;
+        int temp;
+        struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
+        int i, j;
+
+        xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
+
+        spin_lock_irqsave(&xhci->lock, flags);
+        temp = xhci_readl(xhci, &xhci->op_regs->status);
+        xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
+        temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+        xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
+        xhci_dbg(xhci, "No-op commands handled = %d\n", xhci->noops_handled);
+        xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
+        xhci->error_bitmask = 0;
+        xhci_dbg(xhci, "Event ring:\n");
+        xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
+        xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
+        temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
+        temp &= ERST_PTR_MASK;
+        xhci_dbg(xhci, "ERST deq = 0x%x\n", temp);
+        xhci_dbg(xhci, "Command ring:\n");
+        xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
+        xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
+        xhci_dbg_cmd_ptrs(xhci);
+        for (i = 0; i < MAX_HC_SLOTS; ++i) {
+                if (xhci->devs[i]) {
+                        for (j = 0; j < 31; ++j) {
+                                if (xhci->devs[i]->ep_rings[j]) {
+                                        xhci_dbg(xhci, "Dev %d endpoint ring %d:\n", i, j);
+                                        xhci_debug_segment(xhci, xhci->devs[i]->ep_rings[j]->deq_seg);
+                                }
+                        }
+                }
+        }
+
+        if (xhci->noops_submitted != NUM_TEST_NOOPS)
+                if (xhci_setup_one_noop(xhci))
+                        xhci_ring_cmd_db(xhci);
+        spin_unlock_irqrestore(&xhci->lock, flags);
+
+        if (!xhci->zombie)
+                mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
+        else
+                xhci_dbg(xhci, "Quit polling the event ring.\n");
+}
+#endif
+
+/*
+ * Start the HC after it was halted.
+ *
+ * This function is called by the USB core when the HC driver is added.
+ * Its opposite is xhci_stop().
+ *
+ * xhci_init() must be called once before this function can be called.
+ * Reset the HC, enable device slot contexts, program DCBAAP, and
+ * set command ring pointer and event ring pointer.
+ *
+ * Setup MSI-X vectors and enable interrupts.
+ */
+int xhci_run(struct usb_hcd *hcd)
+{
+        u32 temp;
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        void (*doorbell)(struct xhci_hcd *) = NULL;
+
+        hcd->uses_new_polling = 1;
+        hcd->poll_rh = 0;
+
+        xhci_dbg(xhci, "xhci_run\n");
+#if 0   /* FIXME: MSI not setup yet */
+        /* Do this at the very last minute */
+        ret = xhci_setup_msix(xhci);
+        if (!ret)
+                return ret;
+
+        return -ENOSYS;
+#endif
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+        init_timer(&xhci->event_ring_timer);
+        xhci->event_ring_timer.data = (unsigned long) xhci;
+        xhci->event_ring_timer.function = xhci_event_ring_work;
+        /* Poll the event ring */
+        xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
+        xhci->zombie = 0;
+        xhci_dbg(xhci, "Setting event ring polling timer\n");
+        add_timer(&xhci->event_ring_timer);
+#endif
+
+        xhci_dbg(xhci, "// Set the interrupt modulation register\n");
+        temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
+        temp &= ~ER_IRQ_INTERVAL_MASK;
+        temp |= (u32) 160;
+        xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
+
+        /* Set the HCD state before we enable the irqs */
+        hcd->state = HC_STATE_RUNNING;
+        temp = xhci_readl(xhci, &xhci->op_regs->command);
+        temp |= (CMD_EIE);
+        xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n",
+                        temp);
+        xhci_writel(xhci, temp, &xhci->op_regs->command);
+
+        temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+        xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
+                        xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
+        xhci_writel(xhci, ER_IRQ_ENABLE(temp),
+                        &xhci->ir_set->irq_pending);
+        xhci_print_ir_set(xhci, xhci->ir_set, 0);
+
+        if (NUM_TEST_NOOPS > 0)
+                doorbell = xhci_setup_one_noop(xhci);
+
+        xhci_dbg(xhci, "Command ring memory map follows:\n");
+        xhci_debug_ring(xhci, xhci->cmd_ring);
+        xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
+        xhci_dbg_cmd_ptrs(xhci);
+
+        xhci_dbg(xhci, "ERST memory map follows:\n");
+        xhci_dbg_erst(xhci, &xhci->erst);
+        xhci_dbg(xhci, "Event ring:\n");
+        xhci_debug_ring(xhci, xhci->event_ring);
+        xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
+        temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
+        temp &= ERST_PTR_MASK;
+        xhci_dbg(xhci, "ERST deq = 0x%x\n", temp);
+        temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[1]);
+        xhci_dbg(xhci, "ERST deq upper = 0x%x\n", temp);
+
+        temp = xhci_readl(xhci, &xhci->op_regs->command);
+        temp |= (CMD_RUN);
+        xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n",
+                        temp);
+        xhci_writel(xhci, temp, &xhci->op_regs->command);
+        /* Flush PCI posted writes */
+        temp = xhci_readl(xhci, &xhci->op_regs->command);
+        xhci_dbg(xhci, "// @%p = 0x%x\n", &xhci->op_regs->command, temp);
+        if (doorbell)
+                (*doorbell)(xhci);
+
+        xhci_dbg(xhci, "Finished xhci_run\n");
+        return 0;
+}
+
+/*
+ * Stop xHCI driver.
+ *
+ * This function is called by the USB core when the HC driver is removed.
+ * Its opposite is xhci_run().
+ *
+ * Disable device contexts, disable IRQs, and quiesce the HC.
+ * Reset the HC, finish any completed transactions, and cleanup memory.
+ */
+void xhci_stop(struct usb_hcd *hcd)
+{
+        u32 temp;
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+        spin_lock_irq(&xhci->lock);
+        if (HC_IS_RUNNING(hcd->state))
+                xhci_quiesce(xhci);
+        xhci_halt(xhci);
+        xhci_reset(xhci);
+        spin_unlock_irq(&xhci->lock);
+
+#if 0   /* No MSI yet */
+        xhci_cleanup_msix(xhci);
+#endif
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+        /* Tell the event ring poll function not to reschedule */
+        xhci->zombie = 1;
+        del_timer_sync(&xhci->event_ring_timer);
+#endif
+
+        xhci_dbg(xhci, "// Disabling event ring interrupts\n");
+        temp = xhci_readl(xhci, &xhci->op_regs->status);
+        xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
+        temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+        xhci_writel(xhci, ER_IRQ_DISABLE(temp),
+                        &xhci->ir_set->irq_pending);
+        xhci_print_ir_set(xhci, xhci->ir_set, 0);
+
+        xhci_dbg(xhci, "cleaning up memory\n");
+        xhci_mem_cleanup(xhci);
+        xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
+                    xhci_readl(xhci, &xhci->op_regs->status));
+}
+
+/*
+ * Shutdown HC (not bus-specific)
+ *
+ * This is called when the machine is rebooting or halting.  We assume that the
+ * machine will be powered off, and the HC's internal state will be reset.
+ * Don't bother to free memory.
+ */
+void xhci_shutdown(struct usb_hcd *hcd)
+{
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+        spin_lock_irq(&xhci->lock);
+        xhci_halt(xhci);
+        spin_unlock_irq(&xhci->lock);
+
+#if 0
+        xhci_cleanup_msix(xhci);
+#endif
+
+        xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n",
+                    xhci_readl(xhci, &xhci->op_regs->status));
+}
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and
+ * HCDs.  Find the index for an endpoint given its descriptor.  Use the return
+ * value to right shift 1 for the bitmask.
+ *
+ * Index  = (epnum * 2) + direction - 1,
+ * where direction = 0 for OUT, 1 for IN.
+ * For control endpoints, the IN index is used (OUT index is unused), so
+ * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
+ */
+unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc)
+{
+        unsigned int index;
+        if (usb_endpoint_xfer_control(desc))
+                index = (unsigned int) (usb_endpoint_num(desc)*2);
+        else
+                index = (unsigned int) (usb_endpoint_num(desc)*2) +
+                        (usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
+        return index;
+}
+
+/* Find the flag for this endpoint (for use in the control context).  Use the
+ * endpoint index to create a bitmask.  The slot context is bit 0, endpoint 0 is
+ * bit 1, etc.
+ */
+unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
+{
+        return 1 << (xhci_get_endpoint_index(desc) + 1);
+}
+
+/* Compute the last valid endpoint context index.  Basically, this is the
+ * endpoint index plus one.  For slot contexts with more than valid endpoint,
+ * we find the most significant bit set in the added contexts flags.
+ * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
+ * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
+ */
+static inline unsigned int xhci_last_valid_endpoint(u32 added_ctxs)
+{
+        return fls(added_ctxs) - 1;
+}
+
+/* Returns 1 if the arguments are OK;
+ * returns 0 this is a root hub; returns -EINVAL for NULL pointers.
+ */
+int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev,
+                struct usb_host_endpoint *ep, int check_ep, const char *func) {
+        if (!hcd || (check_ep && !ep) || !udev) {
+                printk(KERN_DEBUG "xHCI %s called with invalid args\n",
+                                func);
+                return -EINVAL;
+        }
+        if (!udev->parent) {
+                printk(KERN_DEBUG "xHCI %s called for root hub\n",
+                                func);
+                return 0;
+        }
+        if (!udev->slot_id) {
+                printk(KERN_DEBUG "xHCI %s called with unaddressed device\n",
+                                func);
+                return -EINVAL;
+        }
+        return 1;
+}
+
+/*
+ * non-error returns are a promise to giveback() the urb later
+ * we drop ownership so next owner (or urb unlink) can get it
+ */
+int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
+{
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        unsigned long flags;
+        int ret = 0;
+        unsigned int slot_id, ep_index;
+
+        if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, true, __func__) <= 0)
+                return -EINVAL;
+
+        slot_id = urb->dev->slot_id;
+        ep_index = xhci_get_endpoint_index(&urb->ep->desc);
+
+        spin_lock_irqsave(&xhci->lock, flags);
+        if (!xhci->devs || !xhci->devs[slot_id]) {
+                if (!in_interrupt())
+                        dev_warn(&urb->dev->dev, "WARN: urb submitted for dev with no Slot ID\n");
+                ret = -EINVAL;
+                goto exit;
+        }
+        if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
+                if (!in_interrupt())
+                        xhci_dbg(xhci, "urb submitted during PCI suspend\n");
+                ret = -ESHUTDOWN;
+                goto exit;
+        }
+        if (usb_endpoint_xfer_control(&urb->ep->desc))
+                ret = xhci_queue_ctrl_tx(xhci, mem_flags, urb,
+                                slot_id, ep_index);
+        else if (usb_endpoint_xfer_bulk(&urb->ep->desc))
+                ret = xhci_queue_bulk_tx(xhci, mem_flags, urb,
+                                slot_id, ep_index);
+        else
+                ret = -EINVAL;
+exit:
+        spin_unlock_irqrestore(&xhci->lock, flags);
+        return ret;
+}
+
+/*
+ * Remove the URB's TD from the endpoint ring.  This may cause the HC to stop
+ * USB transfers, potentially stopping in the middle of a TRB buffer.  The HC
+ * should pick up where it left off in the TD, unless a Set Transfer Ring
+ * Dequeue Pointer is issued.
+ *
+ * The TRBs that make up the buffers for the canceled URB will be "removed" from
+ * the ring.  Since the ring is a contiguous structure, they can't be physically
+ * removed.  Instead, there are two options:
+ *
+ *  1) If the HC is in the middle of processing the URB to be canceled, we
+ *     simply move the ring's dequeue pointer past those TRBs using the Set
+ *     Transfer Ring Dequeue Pointer command.  This will be the common case,
+ *     when drivers timeout on the last submitted URB and attempt to cancel.
+ *
+ *  2) If the HC is in the middle of a different TD, we turn the TRBs into a
+ *     series of 1-TRB transfer no-op TDs.  (No-ops shouldn't be chained.)  The
+ *     HC will need to invalidate the any TRBs it has cached after the stop
+ *     endpoint command, as noted in the xHCI 0.95 errata.
+ *
+ *  3) The TD may have completed by the time the Stop Endpoint Command
+ *     completes, so software needs to handle that case too.
+ *
+ * This function should protect against the TD enqueueing code ringing the
+ * doorbell while this code is waiting for a Stop Endpoint command to complete.
+ * It also needs to account for multiple cancellations on happening at the same
+ * time for the same endpoint.
+ *
+ * Note that this function can be called in any context, or so says
+ * usb_hcd_unlink_urb()
+ */
+int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+        unsigned long flags;
+        int ret;
+        struct xhci_hcd *xhci;
+        struct xhci_td *td;
+        unsigned int ep_index;
+        struct xhci_ring *ep_ring;
+
+        xhci = hcd_to_xhci(hcd);
+        spin_lock_irqsave(&xhci->lock, flags);
+        /* Make sure the URB hasn't completed or been unlinked already */
+        ret = usb_hcd_check_unlink_urb(hcd, urb, status);
+        if (ret || !urb->hcpriv)
+                goto done;
+
+        xhci_dbg(xhci, "Cancel URB %p\n", urb);
+        ep_index = xhci_get_endpoint_index(&urb->ep->desc);
+        ep_ring = xhci->devs[urb->dev->slot_id]->ep_rings[ep_index];
+        td = (struct xhci_td *) urb->hcpriv;
+
+        ep_ring->cancels_pending++;
+        list_add_tail(&td->cancelled_td_list, &ep_ring->cancelled_td_list);
+        /* Queue a stop endpoint command, but only if this is
+         * the first cancellation to be handled.
+         */
+        if (ep_ring->cancels_pending == 1) {
+                xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index);
+                xhci_ring_cmd_db(xhci);
+        }
+done:
+        spin_unlock_irqrestore(&xhci->lock, flags);
+        return ret;
+}
+
+/* Drop an endpoint from a new bandwidth configuration for this device.
+ * Only one call to this function is allowed per endpoint before
+ * check_bandwidth() or reset_bandwidth() must be called.
+ * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
+ * add the endpoint to the schedule with possibly new parameters denoted by a
+ * different endpoint descriptor in usb_host_endpoint.
+ * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
+ * not allowed.
+ *
+ * The USB core will not allow URBs to be queued to an endpoint that is being
+ * disabled, so there's no need for mutual exclusion to protect
+ * the xhci->devs[slot_id] structure.
+ */
+int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
+                struct usb_host_endpoint *ep)
+{
+        struct xhci_hcd *xhci;
+        struct xhci_device_control *in_ctx;
+        unsigned int last_ctx;
+        unsigned int ep_index;
+        struct xhci_ep_ctx *ep_ctx;
+        u32 drop_flag;
+        u32 new_add_flags, new_drop_flags, new_slot_info;
+        int ret;
+
+        ret = xhci_check_args(hcd, udev, ep, 1, __func__);
+        if (ret <= 0)
+                return ret;
+        xhci = hcd_to_xhci(hcd);
+        xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
+
+        drop_flag = xhci_get_endpoint_flag(&ep->desc);
+        if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
+                xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
+                                __func__, drop_flag);
+                return 0;
+        }
+
+        if (!xhci->devs || !xhci->devs[udev->slot_id]) {
+                xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
+                                __func__);
+                return -EINVAL;
+        }
+
+        in_ctx = xhci->devs[udev->slot_id]->in_ctx;
+        ep_index = xhci_get_endpoint_index(&ep->desc);
+        ep_ctx = &xhci->devs[udev->slot_id]->out_ctx->ep[ep_index];
+        /* If the HC already knows the endpoint is disabled,
+         * or the HCD has noted it is disabled, ignore this request
+         */
+        if ((ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED ||
+                        in_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) {
+                xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
+                                __func__, ep);
+                return 0;
+        }
+
+        in_ctx->drop_flags |= drop_flag;
+        new_drop_flags = in_ctx->drop_flags;
+
+        in_ctx->add_flags = ~drop_flag;
+        new_add_flags = in_ctx->add_flags;
+
+        last_ctx = xhci_last_valid_endpoint(in_ctx->add_flags);
+        /* Update the last valid endpoint context, if we deleted the last one */
+        if ((in_ctx->slot.dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) {
+                in_ctx->slot.dev_info &= ~LAST_CTX_MASK;
+                in_ctx->slot.dev_info |= LAST_CTX(last_ctx);
+        }
+        new_slot_info = in_ctx->slot.dev_info;
+
+        xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
+
+        xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
+                        (unsigned int) ep->desc.bEndpointAddress,
+                        udev->slot_id,
+                        (unsigned int) new_drop_flags,
+                        (unsigned int) new_add_flags,
+                        (unsigned int) new_slot_info);
+        return 0;
+}
+
+/* Add an endpoint to a new possible bandwidth configuration for this device.
+ * Only one call to this function is allowed per endpoint before
+ * check_bandwidth() or reset_bandwidth() must be called.
+ * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
+ * add the endpoint to the schedule with possibly new parameters denoted by a
+ * different endpoint descriptor in usb_host_endpoint.
+ * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
+ * not allowed.
+ *
+ * The USB core will not allow URBs to be queued to an endpoint until the
+ * configuration or alt setting is installed in the device, so there's no need
+ * for mutual exclusion to protect the xhci->devs[slot_id] structure.
+ */
+int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
+                struct usb_host_endpoint *ep)
+{
+        struct xhci_hcd *xhci;
+        struct xhci_device_control *in_ctx;
+        unsigned int ep_index;
+        struct xhci_ep_ctx *ep_ctx;
+        u32 added_ctxs;
+        unsigned int last_ctx;
+        u32 new_add_flags, new_drop_flags, new_slot_info;
+        int ret = 0;
+
+        ret = xhci_check_args(hcd, udev, ep, 1, __func__);
+        if (ret <= 0)
+                return ret;
+        xhci = hcd_to_xhci(hcd);
+
+        added_ctxs = xhci_get_endpoint_flag(&ep->desc);
+        last_ctx = xhci_last_valid_endpoint(added_ctxs);
+        if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
+                /* FIXME when we have to issue an evaluate endpoint command to
+                 * deal with ep0 max packet size changing once we get the
+                 * descriptors
+                 */
+                xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
+                                __func__, added_ctxs);
+                return 0;
+        }
+
+        if (!xhci->devs || !xhci->devs[udev->slot_id]) {
+                xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
+                                __func__);
+                return -EINVAL;
+        }
+
+        in_ctx = xhci->devs[udev->slot_id]->in_ctx;
+        ep_index = xhci_get_endpoint_index(&ep->desc);
+        ep_ctx = &xhci->devs[udev->slot_id]->out_ctx->ep[ep_index];
+        /* If the HCD has already noted the endpoint is enabled,
+         * ignore this request.
+         */
+        if (in_ctx->add_flags & xhci_get_endpoint_flag(&ep->desc)) {
+                xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
+                                __func__, ep);
+                return 0;
+        }
+
+        /*
+         * Configuration and alternate setting changes must be done in
+         * process context, not interrupt context (or so documenation
+         * for usb_set_interface() and usb_set_configuration() claim).
+         */
+        if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id],
+                                udev, ep, GFP_KERNEL) < 0) {
+                dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
+                                __func__, ep->desc.bEndpointAddress);
+                return -ENOMEM;
+        }
+
+        in_ctx->add_flags |= added_ctxs;
+        new_add_flags = in_ctx->add_flags;
+
+        /* If xhci_endpoint_disable() was called for this endpoint, but the
+         * xHC hasn't been notified yet through the check_bandwidth() call,
+         * this re-adds a new state for the endpoint from the new endpoint
+         * descriptors.  We must drop and re-add this endpoint, so we leave the
+         * drop flags alone.
+         */
+        new_drop_flags = in_ctx->drop_flags;
+
+        /* Update the last valid endpoint context, if we just added one past */
+        if ((in_ctx->slot.dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) {
+                in_ctx->slot.dev_info &= ~LAST_CTX_MASK;
+                in_ctx->slot.dev_info |= LAST_CTX(last_ctx);
+        }
+        new_slot_info = in_ctx->slot.dev_info;
+
+        xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
+                        (unsigned int) ep->desc.bEndpointAddress,
+                        udev->slot_id,
+                        (unsigned int) new_drop_flags,
+                        (unsigned int) new_add_flags,
+                        (unsigned int) new_slot_info);
+        return 0;
+}
+
+static void xhci_zero_in_ctx(struct xhci_virt_device *virt_dev)
+{
+        struct xhci_ep_ctx *ep_ctx;
+        int i;
+
+        /* When a device's add flag and drop flag are zero, any subsequent
+         * configure endpoint command will leave that endpoint's state
+         * untouched.  Make sure we don't leave any old state in the input
+         * endpoint contexts.
+         */
+        virt_dev->in_ctx->drop_flags = 0;
+        virt_dev->in_ctx->add_flags = 0;
+        virt_dev->in_ctx->slot.dev_info &= ~LAST_CTX_MASK;
+        /* Endpoint 0 is always valid */
+        virt_dev->in_ctx->slot.dev_info |= LAST_CTX(1);
+        for (i = 1; i < 31; ++i) {
+                ep_ctx = &virt_dev->in_ctx->ep[i];
+                ep_ctx->ep_info = 0;
+                ep_ctx->ep_info2 = 0;
+                ep_ctx->deq[0] = 0;
+                ep_ctx->deq[1] = 0;
+                ep_ctx->tx_info = 0;
+        }
+}
+
+/* Called after one or more calls to xhci_add_endpoint() or
+ * xhci_drop_endpoint().  If this call fails, the USB core is expected
+ * to call xhci_reset_bandwidth().
+ *
+ * Since we are in the middle of changing either configuration or
+ * installing a new alt setting, the USB core won't allow URBs to be
+ * enqueued for any endpoint on the old config or interface.  Nothing
+ * else should be touching the xhci->devs[slot_id] structure, so we
+ * don't need to take the xhci->lock for manipulating that.
+ */
+int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
+{
+        int i;
+        int ret = 0;
+        int timeleft;
+        unsigned long flags;
+        struct xhci_hcd *xhci;
+        struct xhci_virt_device *virt_dev;
+
+        ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
+        if (ret <= 0)
+                return ret;
+        xhci = hcd_to_xhci(hcd);
+
+        if (!udev->slot_id || !xhci->devs || !xhci->devs[udev->slot_id]) {
+                xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
+                                __func__);
+                return -EINVAL;
+        }
+        xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
+        virt_dev = xhci->devs[udev->slot_id];
+
+        /* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */
+        virt_dev->in_ctx->add_flags |= SLOT_FLAG;
+        virt_dev->in_ctx->add_flags &= ~EP0_FLAG;
+        virt_dev->in_ctx->drop_flags &= ~SLOT_FLAG;
+        virt_dev->in_ctx->drop_flags &= ~EP0_FLAG;
+        xhci_dbg(xhci, "New Input Control Context:\n");
+        xhci_dbg_ctx(xhci, virt_dev->in_ctx, virt_dev->in_ctx_dma,
+                        LAST_CTX_TO_EP_NUM(virt_dev->in_ctx->slot.dev_info));
+
+        spin_lock_irqsave(&xhci->lock, flags);
+        ret = xhci_queue_configure_endpoint(xhci, virt_dev->in_ctx_dma,
+                        udev->slot_id);
+        if (ret < 0) {
+                spin_unlock_irqrestore(&xhci->lock, flags);
+                xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
+                return -ENOMEM;
+        }
+        xhci_ring_cmd_db(xhci);
+        spin_unlock_irqrestore(&xhci->lock, flags);
+
+        /* Wait for the configure endpoint command to complete */
+        timeleft = wait_for_completion_interruptible_timeout(
+                        &virt_dev->cmd_completion,
+                        USB_CTRL_SET_TIMEOUT);
+        if (timeleft <= 0) {
+                xhci_warn(xhci, "%s while waiting for configure endpoint command\n",
+                                timeleft == 0 ? "Timeout" : "Signal");
+                /* FIXME cancel the configure endpoint command */
+                return -ETIME;
+        }
+
+        switch (virt_dev->cmd_status) {
+        case COMP_ENOMEM:
+                dev_warn(&udev->dev, "Not enough host controller resources "
+                                "for new device state.\n");
+                ret = -ENOMEM;
+                /* FIXME: can we allocate more resources for the HC? */
+                break;
+        case COMP_BW_ERR:
+                dev_warn(&udev->dev, "Not enough bandwidth "
+                                "for new device state.\n");
+                ret = -ENOSPC;
+                /* FIXME: can we go back to the old state? */
+                break;
+        case COMP_TRB_ERR:
+                /* the HCD set up something wrong */
+                dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, add flag = 1, "
+                                "and endpoint is not disabled.\n");
+                ret = -EINVAL;
+                break;
+        case COMP_SUCCESS:
+                dev_dbg(&udev->dev, "Successful Endpoint Configure command\n");
+                break;
+        default:
+                xhci_err(xhci, "ERROR: unexpected command completion "
+                                "code 0x%x.\n", virt_dev->cmd_status);
+                ret = -EINVAL;
+                break;
+        }
+        if (ret) {
+                /* Callee should call reset_bandwidth() */
+                return ret;
+        }
+
+        xhci_dbg(xhci, "Output context after successful config ep cmd:\n");
+        xhci_dbg_ctx(xhci, virt_dev->out_ctx, virt_dev->out_ctx_dma,
+                        LAST_CTX_TO_EP_NUM(virt_dev->in_ctx->slot.dev_info));
+
+        xhci_zero_in_ctx(virt_dev);
+        /* Free any old rings */
+        for (i = 1; i < 31; ++i) {
+                if (virt_dev->new_ep_rings[i]) {
+                        xhci_ring_free(xhci, virt_dev->ep_rings[i]);
+                        virt_dev->ep_rings[i] = virt_dev->new_ep_rings[i];
+                        virt_dev->new_ep_rings[i] = NULL;
+                }
+        }
+
+        return ret;
+}
+
+void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
+{
+        struct xhci_hcd *xhci;
+        struct xhci_virt_device *virt_dev;
+        int i, ret;
+
+        ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
+        if (ret <= 0)
+                return;
+        xhci = hcd_to_xhci(hcd);
+
+        if (!xhci->devs || !xhci->devs[udev->slot_id]) {
+                xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
+                                __func__);
+                return;
+        }
+        xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
+        virt_dev = xhci->devs[udev->slot_id];
+        /* Free any rings allocated for added endpoints */
+        for (i = 0; i < 31; ++i) {
+                if (virt_dev->new_ep_rings[i]) {
+                        xhci_ring_free(xhci, virt_dev->new_ep_rings[i]);
+                        virt_dev->new_ep_rings[i] = NULL;
+                }
+        }
+        xhci_zero_in_ctx(virt_dev);
+}
+
+/*
+ * At this point, the struct usb_device is about to go away, the device has
+ * disconnected, and all traffic has been stopped and the endpoints have been
+ * disabled.  Free any HC data structures associated with that device.
+ */
+void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
+{
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        unsigned long flags;
+
+        if (udev->slot_id == 0)
+                return;
+
+        spin_lock_irqsave(&xhci->lock, flags);
+        if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) {
+                spin_unlock_irqrestore(&xhci->lock, flags);
+                xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
+                return;
+        }
+        xhci_ring_cmd_db(xhci);
+        spin_unlock_irqrestore(&xhci->lock, flags);
+        /*
+         * Event command completion handler will free any data structures
+         * associated with the slot.  XXX Can free sleep?
+         */
+}
+
+/*
+ * Returns 0 if the xHC ran out of device slots, the Enable Slot command
+ * timed out, or allocating memory failed.  Returns 1 on success.
+ */
+int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
+{
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        unsigned long flags;
+        int timeleft;
+        int ret;
+
+        spin_lock_irqsave(&xhci->lock, flags);
+        ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0);
+        if (ret) {
+                spin_unlock_irqrestore(&xhci->lock, flags);
+                xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
+                return 0;
+        }
+        xhci_ring_cmd_db(xhci);
+        spin_unlock_irqrestore(&xhci->lock, flags);
+
+        /* XXX: how much time for xHC slot assignment? */
+        timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
+                        USB_CTRL_SET_TIMEOUT);
+        if (timeleft <= 0) {
+                xhci_warn(xhci, "%s while waiting for a slot\n",
+                                timeleft == 0 ? "Timeout" : "Signal");
+                /* FIXME cancel the enable slot request */
+                return 0;
+        }
+
+        if (!xhci->slot_id) {
+                xhci_err(xhci, "Error while assigning device slot ID\n");
+                return 0;
+        }
+        /* xhci_alloc_virt_device() does not touch rings; no need to lock */
+        if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_KERNEL)) {
+                /* Disable slot, if we can do it without mem alloc */
+                xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
+                spin_lock_irqsave(&xhci->lock, flags);
+                if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id))
+                        xhci_ring_cmd_db(xhci);
+                spin_unlock_irqrestore(&xhci->lock, flags);
+                return 0;
+        }
+        udev->slot_id = xhci->slot_id;
+        /* Is this a LS or FS device under a HS hub? */
+        /* Hub or peripherial? */
+        return 1;
+}
+
+/*
+ * Issue an Address Device command (which will issue a SetAddress request to
+ * the device).
+ * We should be protected by the usb_address0_mutex in khubd's hub_port_init, so
+ * we should only issue and wait on one address command at the same time.
+ *
+ * We add one to the device address issued by the hardware because the USB core
+ * uses address 1 for the root hubs (even though they're not really devices).
+ */
+int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
+{
+        unsigned long flags;
+        int timeleft;
+        struct xhci_virt_device *virt_dev;
+        int ret = 0;
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        u32 temp;
+
+        if (!udev->slot_id) {
+                xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id);
+                return -EINVAL;
+        }
+
+        virt_dev = xhci->devs[udev->slot_id];
+
+        /* If this is a Set Address to an unconfigured device, setup ep 0 */
+        if (!udev->config)
+                xhci_setup_addressable_virt_dev(xhci, udev);
+        /* Otherwise, assume the core has the device configured how it wants */
+
+        spin_lock_irqsave(&xhci->lock, flags);
+        ret = xhci_queue_address_device(xhci, virt_dev->in_ctx_dma,
+                        udev->slot_id);
+        if (ret) {
+                spin_unlock_irqrestore(&xhci->lock, flags);
+                xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
+                return ret;
+        }
+        xhci_ring_cmd_db(xhci);
+        spin_unlock_irqrestore(&xhci->lock, flags);
+
+        /* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */
+        timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
+                        USB_CTRL_SET_TIMEOUT);
+        /* FIXME: From section 4.3.4: "Software shall be responsible for timing
+         * the SetAddress() "recovery interval" required by USB and aborting the
+         * command on a timeout.
+         */
+        if (timeleft <= 0) {
+                xhci_warn(xhci, "%s while waiting for a slot\n",
+                                timeleft == 0 ? "Timeout" : "Signal");
+                /* FIXME cancel the address device command */
+                return -ETIME;
+        }
+
+        switch (virt_dev->cmd_status) {
+        case COMP_CTX_STATE:
+        case COMP_EBADSLT:
+                xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n",
+                                udev->slot_id);
+                ret = -EINVAL;
+                break;
+        case COMP_TX_ERR:
+                dev_warn(&udev->dev, "Device not responding to set address.\n");
+                ret = -EPROTO;
+                break;
+        case COMP_SUCCESS:
+                xhci_dbg(xhci, "Successful Address Device command\n");
+                break;
+        default:
+                xhci_err(xhci, "ERROR: unexpected command completion "
+                                "code 0x%x.\n", virt_dev->cmd_status);
+                ret = -EINVAL;
+                break;
+        }
+        if (ret) {
+                return ret;
+        }
+        temp = xhci_readl(xhci, &xhci->op_regs->dcbaa_ptr[0]);
+        xhci_dbg(xhci, "Op regs DCBAA ptr[0] = %#08x\n", temp);
+        temp = xhci_readl(xhci, &xhci->op_regs->dcbaa_ptr[1]);
+        xhci_dbg(xhci, "Op regs DCBAA ptr[1] = %#08x\n", temp);
+        xhci_dbg(xhci, "Slot ID %d dcbaa entry[0] @%p = %#08x\n",
+                        udev->slot_id,
+                        &xhci->dcbaa->dev_context_ptrs[2*udev->slot_id],
+                        xhci->dcbaa->dev_context_ptrs[2*udev->slot_id]);
+        xhci_dbg(xhci, "Slot ID %d dcbaa entry[1] @%p = %#08x\n",
+                        udev->slot_id,
+                        &xhci->dcbaa->dev_context_ptrs[2*udev->slot_id+1],
+                        xhci->dcbaa->dev_context_ptrs[2*udev->slot_id+1]);
+        xhci_dbg(xhci, "Output Context DMA address = %#08llx\n",
+                        (unsigned long long)virt_dev->out_ctx_dma);
+        xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
+        xhci_dbg_ctx(xhci, virt_dev->in_ctx, virt_dev->in_ctx_dma, 2);
+        xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
+        xhci_dbg_ctx(xhci, virt_dev->out_ctx, virt_dev->out_ctx_dma, 2);
+        /*
+         * USB core uses address 1 for the roothubs, so we add one to the
+         * address given back to us by the HC.
+         */
+        udev->devnum = (virt_dev->out_ctx->slot.dev_state & DEV_ADDR_MASK) + 1;
+        /* Zero the input context control for later use */
+        virt_dev->in_ctx->add_flags = 0;
+        virt_dev->in_ctx->drop_flags = 0;
+        /* Mirror flags in the output context for future ep enable/disable */
+        virt_dev->out_ctx->add_flags = SLOT_FLAG | EP0_FLAG;
+        virt_dev->out_ctx->drop_flags = 0;
+
+        xhci_dbg(xhci, "Device address = %d\n", udev->devnum);
+        /* XXX Meh, not sure if anyone else but choose_address uses this. */
+        set_bit(udev->devnum, udev->bus->devmap.devicemap);
+
+        return 0;
+}
+
+int xhci_get_frame(struct usb_hcd *hcd)
+{
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        /* EHCI mods by the periodic size.  Why? */
+        return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3;
+}
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_LICENSE("GPL");
+
+static int __init xhci_hcd_init(void)
+{
+#ifdef CONFIG_PCI
+        int retval = 0;
+
+        retval = xhci_register_pci();
+
+        if (retval < 0) {
+                printk(KERN_DEBUG "Problem registering PCI driver.");
+                return retval;
+        }
+#endif
+        /*
+         * Check the compiler generated sizes of structures that must be laid
+         * out in specific ways for hardware access.
+         */
+        BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
+        BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8);
+        BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8);
+        /* xhci_device_control has eight fields, and also
+         * embeds one xhci_slot_ctx and 31 xhci_ep_ctx
+         */
+        BUILD_BUG_ON(sizeof(struct xhci_device_control) != (8+8+8*31)*32/8);
+        BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8);
+        BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8);
+        BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8);
+        BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8);
+        BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
+        /* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
+        BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
+        BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
+        return 0;
+}
+module_init(xhci_hcd_init);
+
+static void __exit xhci_hcd_cleanup(void)
+{
+#ifdef CONFIG_PCI
+        xhci_unregister_pci();
+#endif
+}
+module_exit(xhci_hcd_cleanup);
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
new file mode 100644
index 000000000000..eac5b53aa9e7
--- /dev/null
+++ b/drivers/usb/host/xhci-hub.c
@@ -0,0 +1,308 @@
+/*
+ * xHCI host controller driver
+ *
+ * Copyright (C) 2008 Intel Corp.
+ *
+ * Author: Sarah Sharp
+ * Some code borrowed from the Linux EHCI driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <asm/unaligned.h>
+
+#include "xhci.h"
+
+static void xhci_hub_descriptor(struct xhci_hcd *xhci,
+                struct usb_hub_descriptor *desc)
+{
+        int ports;
+        u16 temp;
+
+        ports = HCS_MAX_PORTS(xhci->hcs_params1);
+
+        /* USB 3.0 hubs have a different descriptor, but we fake this for now */
+        desc->bDescriptorType = 0x29;
+        desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.9 says 20ms max */
+        desc->bHubContrCurrent = 0;
+
+        desc->bNbrPorts = ports;
+        temp = 1 + (ports / 8);
+        desc->bDescLength = 7 + 2 * temp;
+
+        /* Why does core/hcd.h define bitmap?  It's just confusing. */
+        memset(&desc->DeviceRemovable[0], 0, temp);
+        memset(&desc->DeviceRemovable[temp], 0xff, temp);
+
+        /* Ugh, these should be #defines, FIXME */
+        /* Using table 11-13 in USB 2.0 spec. */
+        temp = 0;
+        /* Bits 1:0 - support port power switching, or power always on */
+        if (HCC_PPC(xhci->hcc_params))
+                temp |= 0x0001;
+        else
+                temp |= 0x0002;
+        /* Bit  2 - root hubs are not part of a compound device */
+        /* Bits 4:3 - individual port over current protection */
+        temp |= 0x0008;
+        /* Bits 6:5 - no TTs in root ports */
+        /* Bit  7 - no port indicators */
+        desc->wHubCharacteristics = (__force __u16) cpu_to_le16(temp);
+}
+
+static unsigned int xhci_port_speed(unsigned int port_status)
+{
+        if (DEV_LOWSPEED(port_status))
+                return 1 << USB_PORT_FEAT_LOWSPEED;
+        if (DEV_HIGHSPEED(port_status))
+                return 1 << USB_PORT_FEAT_HIGHSPEED;
+        if (DEV_SUPERSPEED(port_status))
+                return 1 << USB_PORT_FEAT_SUPERSPEED;
+        /*
+         * FIXME: Yes, we should check for full speed, but the core uses that as
+         * a default in portspeed() in usb/core/hub.c (which is the only place
+         * USB_PORT_FEAT_*SPEED is used).
+         */
+        return 0;
+}
+
+/*
+ * These bits are Read Only (RO) and should be saved and written to the
+ * registers: 0, 3, 10:13, 30
+ * connect status, over-current status, port speed, and device removable.
+ * connect status and port speed are also sticky - meaning they're in
+ * the AUX well and they aren't changed by a hot, warm, or cold reset.
+ */
+#define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
+/*
+ * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
+ * bits 5:8, 9, 14:15, 25:27
+ * link state, port power, port indicator state, "wake on" enable state
+ */
+#define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
+/*
+ * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
+ * bit 4 (port reset)
+ */
+#define XHCI_PORT_RW1S  ((1<<4))
+/*
+ * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
+ * bits 1, 17, 18, 19, 20, 21, 22, 23
+ * port enable/disable, and
+ * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
+ * over-current, reset, link state, and L1 change
+ */
+#define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
+/*
+ * Bit 16 is RW, and writing a '1' to it causes the link state control to be
+ * latched in
+ */
+#define XHCI_PORT_RW    ((1<<16))
+/*
+ * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
+ * bits 2, 24, 28:31
+ */
+#define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
+
+/*
+ * Given a port state, this function returns a value that would result in the
+ * port being in the same state, if the value was written to the port status
+ * control register.
+ * Save Read Only (RO) bits and save read/write bits where
+ * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
+ * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
+ */
+static u32 xhci_port_state_to_neutral(u32 state)
+{
+        /* Save read-only status and port state */
+        return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
+}
+
+int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
+                u16 wIndex, char *buf, u16 wLength)
+{
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        int ports;
+        unsigned long flags;
+        u32 temp, status;
+        int retval = 0;
+        u32 __iomem *addr;
+        char *port_change_bit;
+
+        ports = HCS_MAX_PORTS(xhci->hcs_params1);
+
+        spin_lock_irqsave(&xhci->lock, flags);
+        switch (typeReq) {
+        case GetHubStatus:
+                /* No power source, over-current reported per port */
+                memset(buf, 0, 4);
+                break;
+        case GetHubDescriptor:
+                xhci_hub_descriptor(xhci, (struct usb_hub_descriptor *) buf);
+                break;
+        case GetPortStatus:
+                if (!wIndex || wIndex > ports)
+                        goto error;
+                wIndex--;
+                status = 0;
+                addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
+                temp = xhci_readl(xhci, addr);
+                xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
+
+                /* wPortChange bits */
+                if (temp & PORT_CSC)
+                        status |= 1 << USB_PORT_FEAT_C_CONNECTION;
+                if (temp & PORT_PEC)
+                        status |= 1 << USB_PORT_FEAT_C_ENABLE;
+                if ((temp & PORT_OCC))
+                        status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
+                /*
+                 * FIXME ignoring suspend, reset, and USB 2.1/3.0 specific
+                 * changes
+                 */
+                if (temp & PORT_CONNECT) {
+                        status |= 1 << USB_PORT_FEAT_CONNECTION;
+                        status |= xhci_port_speed(temp);
+                }
+                if (temp & PORT_PE)
+                        status |= 1 << USB_PORT_FEAT_ENABLE;
+                if (temp & PORT_OC)
+                        status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
+                if (temp & PORT_RESET)
+                        status |= 1 << USB_PORT_FEAT_RESET;
+                if (temp & PORT_POWER)
+                        status |= 1 << USB_PORT_FEAT_POWER;
+                xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
+                put_unaligned(cpu_to_le32(status), (__le32 *) buf);
+                break;
+        case SetPortFeature:
+                wIndex &= 0xff;
+                if (!wIndex || wIndex > ports)
+                        goto error;
+                wIndex--;
+                addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
+                temp = xhci_readl(xhci, addr);
+                temp = xhci_port_state_to_neutral(temp);
+                switch (wValue) {
+                case USB_PORT_FEAT_POWER:
+                        /*
+                         * Turn on ports, even if there isn't per-port switching.
+                         * HC will report connect events even before this is set.
+                         * However, khubd will ignore the roothub events until
+                         * the roothub is registered.
+                         */
+                        xhci_writel(xhci, temp | PORT_POWER, addr);
+
+                        temp = xhci_readl(xhci, addr);
+                        xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
+                        break;
+                case USB_PORT_FEAT_RESET:
+                        temp = (temp | PORT_RESET);
+                        xhci_writel(xhci, temp, addr);
+
+                        temp = xhci_readl(xhci, addr);
+                        xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
+                        break;
+                default:
+                        goto error;
+                }
+                temp = xhci_readl(xhci, addr); /* unblock any posted writes */
+                break;
+        case ClearPortFeature:
+                if (!wIndex || wIndex > ports)
+                        goto error;
+                wIndex--;
+                addr = &xhci->op_regs->port_status_base +
+                        NUM_PORT_REGS*(wIndex & 0xff);
+                temp = xhci_readl(xhci, addr);
+                temp = xhci_port_state_to_neutral(temp);
+                switch (wValue) {
+                case USB_PORT_FEAT_C_RESET:
+                        status = PORT_RC;
+                        port_change_bit = "reset";
+                        break;
+                case USB_PORT_FEAT_C_CONNECTION:
+                        status = PORT_CSC;
+                        port_change_bit = "connect";
+                        break;
+                case USB_PORT_FEAT_C_OVER_CURRENT:
+                        status = PORT_OCC;
+                        port_change_bit = "over-current";
+                        break;
+                default:
+                        goto error;
+                }
+                /* Change bits are all write 1 to clear */
+                xhci_writel(xhci, temp | status, addr);
+                temp = xhci_readl(xhci, addr);
+                xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
+                                port_change_bit, wIndex, temp);
+                temp = xhci_readl(xhci, addr); /* unblock any posted writes */
+                break;
+        default:
+error:
+                /* "stall" on error */
+                retval = -EPIPE;
+        }
+        spin_unlock_irqrestore(&xhci->lock, flags);
+        return retval;
+}
+
+/*
+ * Returns 0 if the status hasn't changed, or the number of bytes in buf.
+ * Ports are 0-indexed from the HCD point of view,
+ * and 1-indexed from the USB core pointer of view.
+ * xHCI instances can have up to 127 ports, so FIXME if you see more than 15.
+ *
+ * Note that the status change bits will be cleared as soon as a port status
+ * change event is generated, so we use the saved status from that event.
+ */
+int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+        unsigned long flags;
+        u32 temp, status;
+        int i, retval;
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        int ports;
+        u32 __iomem *addr;
+
+        ports = HCS_MAX_PORTS(xhci->hcs_params1);
+
+        /* Initial status is no changes */
+        buf[0] = 0;
+        status = 0;
+        if (ports > 7) {
+                buf[1] = 0;
+                retval = 2;
+        } else {
+                retval = 1;
+        }
+
+        spin_lock_irqsave(&xhci->lock, flags);
+        /* For each port, did anything change?  If so, set that bit in buf. */
+        for (i = 0; i < ports; i++) {
+                addr = &xhci->op_regs->port_status_base +
+                        NUM_PORT_REGS*i;
+                temp = xhci_readl(xhci, addr);
+                if (temp & (PORT_CSC | PORT_PEC | PORT_OCC)) {
+                        if (i < 7)
+                                buf[0] |= 1 << (i + 1);
+                        else
+                                buf[1] |= 1 << (i - 7);
+                        status = 1;
+                }
+        }
+        spin_unlock_irqrestore(&xhci->lock, flags);
+        return status ? retval : 0;
+}
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
new file mode 100644
index 000000000000..c8a72de1c508
--- /dev/null
+++ b/drivers/usb/host/xhci-mem.c
@@ -0,0 +1,769 @@
+/*
+ * xHCI host controller driver
+ *
+ * Copyright (C) 2008 Intel Corp.
+ *
+ * Author: Sarah Sharp
+ * Some code borrowed from the Linux EHCI driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/usb.h>
+#include <linux/pci.h>
+#include <linux/dmapool.h>
+
+#include "xhci.h"
+
+/*
+ * Allocates a generic ring segment from the ring pool, sets the dma address,
+ * initializes the segment to zero, and sets the private next pointer to NULL.
+ *
+ * Section 4.11.1.1:
+ * "All components of all Command and Transfer TRBs shall be initialized to '0'"
+ */
+static struct xhci_segment *xhci_segment_alloc(struct xhci_hcd *xhci, gfp_t flags)
+{
+        struct xhci_segment *seg;
+        dma_addr_t      dma;
+
+        seg = kzalloc(sizeof *seg, flags);
+        if (!seg)
+                return 0;
+        xhci_dbg(xhci, "Allocating priv segment structure at %p\n", seg);
+
+        seg->trbs = dma_pool_alloc(xhci->segment_pool, flags, &dma);
+        if (!seg->trbs) {
+                kfree(seg);
+                return 0;
+        }
+        xhci_dbg(xhci, "// Allocating segment at %p (virtual) 0x%llx (DMA)\n",
+                        seg->trbs, (unsigned long long)dma);
+
+        memset(seg->trbs, 0, SEGMENT_SIZE);
+        seg->dma = dma;
+        seg->next = NULL;
+
+        return seg;
+}
+
+static void xhci_segment_free(struct xhci_hcd *xhci, struct xhci_segment *seg)
+{
+        if (!seg)
+                return;
+        if (seg->trbs) {
+                xhci_dbg(xhci, "Freeing DMA segment at %p (virtual) 0x%llx (DMA)\n",
+                                seg->trbs, (unsigned long long)seg->dma);
+                dma_pool_free(xhci->segment_pool, seg->trbs, seg->dma);
+                seg->trbs = NULL;
+        }
+        xhci_dbg(xhci, "Freeing priv segment structure at %p\n", seg);
+        kfree(seg);
+}
+
+/*
+ * Make the prev segment point to the next segment.
+ *
+ * Change the last TRB in the prev segment to be a Link TRB which points to the
+ * DMA address of the next segment.  The caller needs to set any Link TRB
+ * related flags, such as End TRB, Toggle Cycle, and no snoop.
+ */
+static void xhci_link_segments(struct xhci_hcd *xhci, struct xhci_segment *prev,
+                struct xhci_segment *next, bool link_trbs)
+{
+        u32 val;
+
+        if (!prev || !next)
+                return;
+        prev->next = next;
+        if (link_trbs) {
+                prev->trbs[TRBS_PER_SEGMENT-1].link.segment_ptr[0] = next->dma;
+
+                /* Set the last TRB in the segment to have a TRB type ID of Link TRB */
+                val = prev->trbs[TRBS_PER_SEGMENT-1].link.control;
+                val &= ~TRB_TYPE_BITMASK;
+                val |= TRB_TYPE(TRB_LINK);
+                prev->trbs[TRBS_PER_SEGMENT-1].link.control = val;
+        }
+        xhci_dbg(xhci, "Linking segment 0x%llx to segment 0x%llx (DMA)\n",
+                        (unsigned long long)prev->dma,
+                        (unsigned long long)next->dma);
+}
+
+/* XXX: Do we need the hcd structure in all these functions? */
+void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring)
+{
+        struct xhci_segment *seg;
+        struct xhci_segment *first_seg;
+
+        if (!ring || !ring->first_seg)
+                return;
+        first_seg = ring->first_seg;
+        seg = first_seg->next;
+        xhci_dbg(xhci, "Freeing ring at %p\n", ring);
+        while (seg != first_seg) {
+                struct xhci_segment *next = seg->next;
+                xhci_segment_free(xhci, seg);
+                seg = next;
+        }
+        xhci_segment_free(xhci, first_seg);
+        ring->first_seg = NULL;
+        kfree(ring);
+}
+
+/**
+ * Create a new ring with zero or more segments.
+ *
+ * Link each segment together into a ring.
+ * Set the end flag and the cycle toggle bit on the last segment.
+ * See section 4.9.1 and figures 15 and 16.
+ */
+static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
+                unsigned int num_segs, bool link_trbs, gfp_t flags)
+{
+        struct xhci_ring        *ring;
+        struct xhci_segment     *prev;
+
+        ring = kzalloc(sizeof *(ring), flags);
+        xhci_dbg(xhci, "Allocating ring at %p\n", ring);
+        if (!ring)
+                return 0;
+
+        INIT_LIST_HEAD(&ring->td_list);
+        INIT_LIST_HEAD(&ring->cancelled_td_list);
+        if (num_segs == 0)
+                return ring;
+
+        ring->first_seg = xhci_segment_alloc(xhci, flags);
+        if (!ring->first_seg)
+                goto fail;
+        num_segs--;
+
+        prev = ring->first_seg;
+        while (num_segs > 0) {
+                struct xhci_segment     *next;
+
+                next = xhci_segment_alloc(xhci, flags);
+                if (!next)
+                        goto fail;
+                xhci_link_segments(xhci, prev, next, link_trbs);
+
+                prev = next;
+                num_segs--;
+        }
+        xhci_link_segments(xhci, prev, ring->first_seg, link_trbs);
+
+        if (link_trbs) {
+                /* See section 4.9.2.1 and 6.4.4.1 */
+                prev->trbs[TRBS_PER_SEGMENT-1].link.control |= (LINK_TOGGLE);
+                xhci_dbg(xhci, "Wrote link toggle flag to"
+                                " segment %p (virtual), 0x%llx (DMA)\n",
+                                prev, (unsigned long long)prev->dma);
+        }
+        /* The ring is empty, so the enqueue pointer == dequeue pointer */
+        ring->enqueue = ring->first_seg->trbs;
+        ring->enq_seg = ring->first_seg;
+        ring->dequeue = ring->enqueue;
+        ring->deq_seg = ring->first_seg;
+        /* The ring is initialized to 0. The producer must write 1 to the cycle
+         * bit to handover ownership of the TRB, so PCS = 1.  The consumer must
+         * compare CCS to the cycle bit to check ownership, so CCS = 1.
+         */
+        ring->cycle_state = 1;
+
+        return ring;
+
+fail:
+        xhci_ring_free(xhci, ring);
+        return 0;
+}
+
+/* All the xhci_tds in the ring's TD list should be freed at this point */
+void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id)
+{
+        struct xhci_virt_device *dev;
+        int i;
+
+        /* Slot ID 0 is reserved */
+        if (slot_id == 0 || !xhci->devs[slot_id])
+                return;
+
+        dev = xhci->devs[slot_id];
+        xhci->dcbaa->dev_context_ptrs[2*slot_id] = 0;
+        xhci->dcbaa->dev_context_ptrs[2*slot_id + 1] = 0;
+        if (!dev)
+                return;
+
+        for (i = 0; i < 31; ++i)
+                if (dev->ep_rings[i])
+                        xhci_ring_free(xhci, dev->ep_rings[i]);
+
+        if (dev->in_ctx)
+                dma_pool_free(xhci->device_pool,
+                                dev->in_ctx, dev->in_ctx_dma);
+        if (dev->out_ctx)
+                dma_pool_free(xhci->device_pool,
+                                dev->out_ctx, dev->out_ctx_dma);
+        kfree(xhci->devs[slot_id]);
+        xhci->devs[slot_id] = 0;
+}
+
+int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id,
+                struct usb_device *udev, gfp_t flags)
+{
+        dma_addr_t      dma;
+        struct xhci_virt_device *dev;
+
+        /* Slot ID 0 is reserved */
+        if (slot_id == 0 || xhci->devs[slot_id]) {
+                xhci_warn(xhci, "Bad Slot ID %d\n", slot_id);
+                return 0;
+        }
+
+        xhci->devs[slot_id] = kzalloc(sizeof(*xhci->devs[slot_id]), flags);
+        if (!xhci->devs[slot_id])
+                return 0;
+        dev = xhci->devs[slot_id];
+
+        /* Allocate the (output) device context that will be used in the HC */
+        dev->out_ctx = dma_pool_alloc(xhci->device_pool, flags, &dma);
+        if (!dev->out_ctx)
+                goto fail;
+        dev->out_ctx_dma = dma;
+        xhci_dbg(xhci, "Slot %d output ctx = 0x%llx (dma)\n", slot_id,
+                        (unsigned long long)dma);
+        memset(dev->out_ctx, 0, sizeof(*dev->out_ctx));
+
+        /* Allocate the (input) device context for address device command */
+        dev->in_ctx = dma_pool_alloc(xhci->device_pool, flags, &dma);
+        if (!dev->in_ctx)
+                goto fail;
+        dev->in_ctx_dma = dma;
+        xhci_dbg(xhci, "Slot %d input ctx = 0x%llx (dma)\n", slot_id,
+                        (unsigned long long)dma);
+        memset(dev->in_ctx, 0, sizeof(*dev->in_ctx));
+
+        /* Allocate endpoint 0 ring */
+        dev->ep_rings[0] = xhci_ring_alloc(xhci, 1, true, flags);
+        if (!dev->ep_rings[0])
+                goto fail;
+
+        init_completion(&dev->cmd_completion);
+
+        /*
+         * Point to output device context in dcbaa; skip the output control
+         * context, which is eight 32 bit fields (or 32 bytes long)
+         */
+        xhci->dcbaa->dev_context_ptrs[2*slot_id] =
+                (u32) dev->out_ctx_dma + (32);
+        xhci_dbg(xhci, "Set slot id %d dcbaa entry %p to 0x%llx\n",
+                        slot_id,
+                        &xhci->dcbaa->dev_context_ptrs[2*slot_id],
+                        (unsigned long long)dev->out_ctx_dma);
+        xhci->dcbaa->dev_context_ptrs[2*slot_id + 1] = 0;
+
+        return 1;
+fail:
+        xhci_free_virt_device(xhci, slot_id);
+        return 0;
+}
+
+/* Setup an xHCI virtual device for a Set Address command */
+int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *udev)
+{
+        struct xhci_virt_device *dev;
+        struct xhci_ep_ctx      *ep0_ctx;
+        struct usb_device       *top_dev;
+
+        dev = xhci->devs[udev->slot_id];
+        /* Slot ID 0 is reserved */
+        if (udev->slot_id == 0 || !dev) {
+                xhci_warn(xhci, "Slot ID %d is not assigned to this device\n",
+                                udev->slot_id);
+                return -EINVAL;
+        }
+        ep0_ctx = &dev->in_ctx->ep[0];
+
+        /* 2) New slot context and endpoint 0 context are valid*/
+        dev->in_ctx->add_flags = SLOT_FLAG | EP0_FLAG;
+
+        /* 3) Only the control endpoint is valid - one endpoint context */
+        dev->in_ctx->slot.dev_info |= LAST_CTX(1);
+
+        switch (udev->speed) {
+        case USB_SPEED_SUPER:
+                dev->in_ctx->slot.dev_info |= (u32) udev->route;
+                dev->in_ctx->slot.dev_info |= (u32) SLOT_SPEED_SS;
+                break;
+        case USB_SPEED_HIGH:
+                dev->in_ctx->slot.dev_info |= (u32) SLOT_SPEED_HS;
+                break;
+        case USB_SPEED_FULL:
+                dev->in_ctx->slot.dev_info |= (u32) SLOT_SPEED_FS;
+                break;
+        case USB_SPEED_LOW:
+                dev->in_ctx->slot.dev_info |= (u32) SLOT_SPEED_LS;
+                break;
+        case USB_SPEED_VARIABLE:
+                xhci_dbg(xhci, "FIXME xHCI doesn't support wireless speeds\n");
+                return -EINVAL;
+                break;
+        default:
+                /* Speed was set earlier, this shouldn't happen. */
+                BUG();
+        }
+        /* Find the root hub port this device is under */
+        for (top_dev = udev; top_dev->parent && top_dev->parent->parent;
+                        top_dev = top_dev->parent)
+                /* Found device below root hub */;
+        dev->in_ctx->slot.dev_info2 |= (u32) ROOT_HUB_PORT(top_dev->portnum);
+        xhci_dbg(xhci, "Set root hub portnum to %d\n", top_dev->portnum);
+
+        /* Is this a LS/FS device under a HS hub? */
+        /*
+         * FIXME: I don't think this is right, where does the TT info for the
+         * roothub or parent hub come from?
+         */
+        if ((udev->speed == USB_SPEED_LOW || udev->speed == USB_SPEED_FULL) &&
+                        udev->tt) {
+                dev->in_ctx->slot.tt_info = udev->tt->hub->slot_id;
+                dev->in_ctx->slot.tt_info |= udev->ttport << 8;
+        }
+        xhci_dbg(xhci, "udev->tt = %p\n", udev->tt);
+        xhci_dbg(xhci, "udev->ttport = 0x%x\n", udev->ttport);
+
+        /* Step 4 - ring already allocated */
+        /* Step 5 */
+        ep0_ctx->ep_info2 = EP_TYPE(CTRL_EP);
+        /*
+         * See section 4.3 bullet 6:
+         * The default Max Packet size for ep0 is "8 bytes for a USB2
+         * LS/FS/HS device or 512 bytes for a USB3 SS device"
+         * XXX: Not sure about wireless USB devices.
+         */
+        if (udev->speed == USB_SPEED_SUPER)
+                ep0_ctx->ep_info2 |= MAX_PACKET(512);
+        else
+                ep0_ctx->ep_info2 |= MAX_PACKET(8);
+        /* EP 0 can handle "burst" sizes of 1, so Max Burst Size field is 0 */
+        ep0_ctx->ep_info2 |= MAX_BURST(0);
+        ep0_ctx->ep_info2 |= ERROR_COUNT(3);
+
+        ep0_ctx->deq[0] =
+                dev->ep_rings[0]->first_seg->dma;
+        ep0_ctx->deq[0] |= dev->ep_rings[0]->cycle_state;
+        ep0_ctx->deq[1] = 0;
+
+        /* Steps 7 and 8 were done in xhci_alloc_virt_device() */
+
+        return 0;
+}
+
+/* Return the polling or NAK interval.
+ *
+ * The polling interval is expressed in "microframes".  If xHCI's Interval field
+ * is set to N, it will service the endpoint every 2^(Interval)*125us.
+ *
+ * The NAK interval is one NAK per 1 to 255 microframes, or no NAKs if interval
+ * is set to 0.
+ */
+static inline unsigned int xhci_get_endpoint_interval(struct usb_device *udev,
+                struct usb_host_endpoint *ep)
+{
+        unsigned int interval = 0;
+
+        switch (udev->speed) {
+        case USB_SPEED_HIGH:
+                /* Max NAK rate */
+                if (usb_endpoint_xfer_control(&ep->desc) ||
+                                usb_endpoint_xfer_bulk(&ep->desc))
+                        interval = ep->desc.bInterval;
+                /* Fall through - SS and HS isoc/int have same decoding */
+        case USB_SPEED_SUPER:
+                if (usb_endpoint_xfer_int(&ep->desc) ||
+                                usb_endpoint_xfer_isoc(&ep->desc)) {
+                        if (ep->desc.bInterval == 0)
+                                interval = 0;
+                        else
+                                interval = ep->desc.bInterval - 1;
+                        if (interval > 15)
+                                interval = 15;
+                        if (interval != ep->desc.bInterval + 1)
+                                dev_warn(&udev->dev, "ep %#x - rounding interval to %d microframes\n",
+                                                ep->desc.bEndpointAddress, 1 << interval);
+                }
+                break;
+        /* Convert bInterval (in 1-255 frames) to microframes and round down to
+         * nearest power of 2.
+         */
+        case USB_SPEED_FULL:
+        case USB_SPEED_LOW:
+                if (usb_endpoint_xfer_int(&ep->desc) ||
+                                usb_endpoint_xfer_isoc(&ep->desc)) {
+                        interval = fls(8*ep->desc.bInterval) - 1;
+                        if (interval > 10)
+                                interval = 10;
+                        if (interval < 3)
+                                interval = 3;
+                        if ((1 << interval) != 8*ep->desc.bInterval)
+                                dev_warn(&udev->dev, "ep %#x - rounding interval to %d microframes\n",
+                                                ep->desc.bEndpointAddress, 1 << interval);
+                }
+                break;
+        default:
+                BUG();
+        }
+        return EP_INTERVAL(interval);
+}
+
+static inline u32 xhci_get_endpoint_type(struct usb_device *udev,
+                struct usb_host_endpoint *ep)
+{
+        int in;
+        u32 type;
+
+        in = usb_endpoint_dir_in(&ep->desc);
+        if (usb_endpoint_xfer_control(&ep->desc)) {
+                type = EP_TYPE(CTRL_EP);
+        } else if (usb_endpoint_xfer_bulk(&ep->desc)) {
+                if (in)
+                        type = EP_TYPE(BULK_IN_EP);
+                else
+                        type = EP_TYPE(BULK_OUT_EP);
+        } else if (usb_endpoint_xfer_isoc(&ep->desc)) {
+                if (in)
+                        type = EP_TYPE(ISOC_IN_EP);
+                else
+                        type = EP_TYPE(ISOC_OUT_EP);
+        } else if (usb_endpoint_xfer_int(&ep->desc)) {
+                if (in)
+                        type = EP_TYPE(INT_IN_EP);
+                else
+                        type = EP_TYPE(INT_OUT_EP);
+        } else {
+                BUG();
+        }
+        return type;
+}
+
+int xhci_endpoint_init(struct xhci_hcd *xhci,
+                struct xhci_virt_device *virt_dev,
+                struct usb_device *udev,
+                struct usb_host_endpoint *ep,
+                gfp_t mem_flags)
+{
+        unsigned int ep_index;
+        struct xhci_ep_ctx *ep_ctx;
+        struct xhci_ring *ep_ring;
+        unsigned int max_packet;
+        unsigned int max_burst;
+
+        ep_index = xhci_get_endpoint_index(&ep->desc);
+        ep_ctx = &virt_dev->in_ctx->ep[ep_index];
+
+        /* Set up the endpoint ring */
+        virt_dev->new_ep_rings[ep_index] = xhci_ring_alloc(xhci, 1, true, mem_flags);
+        if (!virt_dev->new_ep_rings[ep_index])
+                return -ENOMEM;
+        ep_ring = virt_dev->new_ep_rings[ep_index];
+        ep_ctx->deq[0] = ep_ring->first_seg->dma | ep_ring->cycle_state;
+        ep_ctx->deq[1] = 0;
+
+        ep_ctx->ep_info = xhci_get_endpoint_interval(udev, ep);
+
+        /* FIXME dig Mult and streams info out of ep companion desc */
+
+        /* Allow 3 retries for everything but isoc */
+        if (!usb_endpoint_xfer_isoc(&ep->desc))
+                ep_ctx->ep_info2 = ERROR_COUNT(3);
+        else
+                ep_ctx->ep_info2 = ERROR_COUNT(0);
+
+        ep_ctx->ep_info2 |= xhci_get_endpoint_type(udev, ep);
+
+        /* Set the max packet size and max burst */
+        switch (udev->speed) {
+        case USB_SPEED_SUPER:
+                max_packet = ep->desc.wMaxPacketSize;
+                ep_ctx->ep_info2 |= MAX_PACKET(max_packet);
+                /* dig out max burst from ep companion desc */
+                max_packet = ep->ss_ep_comp->desc.bMaxBurst;
+                ep_ctx->ep_info2 |= MAX_BURST(max_packet);
+                break;
+        case USB_SPEED_HIGH:
+                /* bits 11:12 specify the number of additional transaction
+                 * opportunities per microframe (USB 2.0, section 9.6.6)
+                 */
+                if (usb_endpoint_xfer_isoc(&ep->desc) ||
+                                usb_endpoint_xfer_int(&ep->desc)) {
+                        max_burst = (ep->desc.wMaxPacketSize & 0x1800) >> 11;
+                        ep_ctx->ep_info2 |= MAX_BURST(max_burst);
+                }
+                /* Fall through */
+        case USB_SPEED_FULL:
+        case USB_SPEED_LOW:
+                max_packet = ep->desc.wMaxPacketSize & 0x3ff;
+                ep_ctx->ep_info2 |= MAX_PACKET(max_packet);
+                break;
+        default:
+                BUG();
+        }
+        /* FIXME Debug endpoint context */
+        return 0;
+}
+
+void xhci_endpoint_zero(struct xhci_hcd *xhci,
+                struct xhci_virt_device *virt_dev,
+                struct usb_host_endpoint *ep)
+{
+        unsigned int ep_index;
+        struct xhci_ep_ctx *ep_ctx;
+
+        ep_index = xhci_get_endpoint_index(&ep->desc);
+        ep_ctx = &virt_dev->in_ctx->ep[ep_index];
+
+        ep_ctx->ep_info = 0;
+        ep_ctx->ep_info2 = 0;
+        ep_ctx->deq[0] = 0;
+        ep_ctx->deq[1] = 0;
+        ep_ctx->tx_info = 0;
+        /* Don't free the endpoint ring until the set interface or configuration
+         * request succeeds.
+         */
+}
+
+void xhci_mem_cleanup(struct xhci_hcd *xhci)
+{
+        struct pci_dev  *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
+        int size;
+        int i;
+
+        /* Free the Event Ring Segment Table and the actual Event Ring */
+        xhci_writel(xhci, 0, &xhci->ir_set->erst_size);
+        xhci_writel(xhci, 0, &xhci->ir_set->erst_base[0]);
+        xhci_writel(xhci, 0, &xhci->ir_set->erst_base[1]);
+        xhci_writel(xhci, 0, &xhci->ir_set->erst_dequeue[0]);
+        xhci_writel(xhci, 0, &xhci->ir_set->erst_dequeue[1]);
+        size = sizeof(struct xhci_erst_entry)*(xhci->erst.num_entries);
+        if (xhci->erst.entries)
+                pci_free_consistent(pdev, size,
+                                xhci->erst.entries, xhci->erst.erst_dma_addr);
+        xhci->erst.entries = NULL;
+        xhci_dbg(xhci, "Freed ERST\n");
+        if (xhci->event_ring)
+                xhci_ring_free(xhci, xhci->event_ring);
+        xhci->event_ring = NULL;
+        xhci_dbg(xhci, "Freed event ring\n");
+
+        xhci_writel(xhci, 0, &xhci->op_regs->cmd_ring[0]);
+        xhci_writel(xhci, 0, &xhci->op_regs->cmd_ring[1]);
+        if (xhci->cmd_ring)
+                xhci_ring_free(xhci, xhci->cmd_ring);
+        xhci->cmd_ring = NULL;
+        xhci_dbg(xhci, "Freed command ring\n");
+
+        for (i = 1; i < MAX_HC_SLOTS; ++i)
+                xhci_free_virt_device(xhci, i);
+
+        if (xhci->segment_pool)
+                dma_pool_destroy(xhci->segment_pool);
+        xhci->segment_pool = NULL;
+        xhci_dbg(xhci, "Freed segment pool\n");
+
+        if (xhci->device_pool)
+                dma_pool_destroy(xhci->device_pool);
+        xhci->device_pool = NULL;
+        xhci_dbg(xhci, "Freed device context pool\n");
+
+        xhci_writel(xhci, 0, &xhci->op_regs->dcbaa_ptr[0]);
+        xhci_writel(xhci, 0, &xhci->op_regs->dcbaa_ptr[1]);
+        if (xhci->dcbaa)
+                pci_free_consistent(pdev, sizeof(*xhci->dcbaa),
+                                xhci->dcbaa, xhci->dcbaa->dma);
+        xhci->dcbaa = NULL;
+
+        xhci->page_size = 0;
+        xhci->page_shift = 0;
+}
+
+int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
+{
+        dma_addr_t      dma;
+        struct device   *dev = xhci_to_hcd(xhci)->self.controller;
+        unsigned int    val, val2;
+        struct xhci_segment     *seg;
+        u32 page_size;
+        int i;
+
+        page_size = xhci_readl(xhci, &xhci->op_regs->page_size);
+        xhci_dbg(xhci, "Supported page size register = 0x%x\n", page_size);
+        for (i = 0; i < 16; i++) {
+                if ((0x1 & page_size) != 0)
+                        break;
+                page_size = page_size >> 1;
+        }
+        if (i < 16)
+                xhci_dbg(xhci, "Supported page size of %iK\n", (1 << (i+12)) / 1024);
+        else
+                xhci_warn(xhci, "WARN: no supported page size\n");
+        /* Use 4K pages, since that's common and the minimum the HC supports */
+        xhci->page_shift = 12;
+        xhci->page_size = 1 << xhci->page_shift;
+        xhci_dbg(xhci, "HCD page size set to %iK\n", xhci->page_size / 1024);
+
+        /*
+         * Program the Number of Device Slots Enabled field in the CONFIG
+         * register with the max value of slots the HC can handle.
+         */
+        val = HCS_MAX_SLOTS(xhci_readl(xhci, &xhci->cap_regs->hcs_params1));
+        xhci_dbg(xhci, "// xHC can handle at most %d device slots.\n",
+                        (unsigned int) val);
+        val2 = xhci_readl(xhci, &xhci->op_regs->config_reg);
+        val |= (val2 & ~HCS_SLOTS_MASK);
+        xhci_dbg(xhci, "// Setting Max device slots reg = 0x%x.\n",
+                        (unsigned int) val);
+        xhci_writel(xhci, val, &xhci->op_regs->config_reg);
+
+        /*
+         * Section 5.4.8 - doorbell array must be
+         * "physically contiguous and 64-byte (cache line) aligned".
+         */
+        xhci->dcbaa = pci_alloc_consistent(to_pci_dev(dev),
+                        sizeof(*xhci->dcbaa), &dma);
+        if (!xhci->dcbaa)
+                goto fail;
+        memset(xhci->dcbaa, 0, sizeof *(xhci->dcbaa));
+        xhci->dcbaa->dma = dma;
+        xhci_dbg(xhci, "// Device context base array address = 0x%llx (DMA), %p (virt)\n",
+                        (unsigned long long)xhci->dcbaa->dma, xhci->dcbaa);
+        xhci_writel(xhci, dma, &xhci->op_regs->dcbaa_ptr[0]);
+        xhci_writel(xhci, (u32) 0, &xhci->op_regs->dcbaa_ptr[1]);
+
+        /*
+         * Initialize the ring segment pool.  The ring must be a contiguous
+         * structure comprised of TRBs.  The TRBs must be 16 byte aligned,
+         * however, the command ring segment needs 64-byte aligned segments,
+         * so we pick the greater alignment need.
+         */
+        xhci->segment_pool = dma_pool_create("xHCI ring segments", dev,
+                        SEGMENT_SIZE, 64, xhci->page_size);
+        /* See Table 46 and Note on Figure 55 */
+        /* FIXME support 64-byte contexts */
+        xhci->device_pool = dma_pool_create("xHCI input/output contexts", dev,
+                        sizeof(struct xhci_device_control),
+                        64, xhci->page_size);
+        if (!xhci->segment_pool || !xhci->device_pool)
+                goto fail;
+
+        /* Set up the command ring to have one segments for now. */
+        xhci->cmd_ring = xhci_ring_alloc(xhci, 1, true, flags);
+        if (!xhci->cmd_ring)
+                goto fail;
+        xhci_dbg(xhci, "Allocated command ring at %p\n", xhci->cmd_ring);
+        xhci_dbg(xhci, "First segment DMA is 0x%llx\n",
+                        (unsigned long long)xhci->cmd_ring->first_seg->dma);
+
+        /* Set the address in the Command Ring Control register */
+        val = xhci_readl(xhci, &xhci->op_regs->cmd_ring[0]);
+        val = (val & ~CMD_RING_ADDR_MASK) |
+                (xhci->cmd_ring->first_seg->dma & CMD_RING_ADDR_MASK) |
+                xhci->cmd_ring->cycle_state;
+        xhci_dbg(xhci, "// Setting command ring address low bits to 0x%x\n", val);
+        xhci_writel(xhci, val, &xhci->op_regs->cmd_ring[0]);
+        xhci_dbg(xhci, "// Setting command ring address high bits to 0x0\n");
+        xhci_writel(xhci, (u32) 0, &xhci->op_regs->cmd_ring[1]);
+        xhci_dbg_cmd_ptrs(xhci);
+
+        val = xhci_readl(xhci, &xhci->cap_regs->db_off);
+        val &= DBOFF_MASK;
+        xhci_dbg(xhci, "// Doorbell array is located at offset 0x%x"
+                        " from cap regs base addr\n", val);
+        xhci->dba = (void *) xhci->cap_regs + val;
+        xhci_dbg_regs(xhci);
+        xhci_print_run_regs(xhci);
+        /* Set ir_set to interrupt register set 0 */
+        xhci->ir_set = (void *) xhci->run_regs->ir_set;
+
+        /*
+         * Event ring setup: Allocate a normal ring, but also setup
+         * the event ring segment table (ERST).  Section 4.9.3.
+         */
+        xhci_dbg(xhci, "// Allocating event ring\n");
+        xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, false, flags);
+        if (!xhci->event_ring)
+                goto fail;
+
+        xhci->erst.entries = pci_alloc_consistent(to_pci_dev(dev),
+                        sizeof(struct xhci_erst_entry)*ERST_NUM_SEGS, &dma);
+        if (!xhci->erst.entries)
+                goto fail;
+        xhci_dbg(xhci, "// Allocated event ring segment table at 0x%llx\n",
+                        (unsigned long long)dma);
+
+        memset(xhci->erst.entries, 0, sizeof(struct xhci_erst_entry)*ERST_NUM_SEGS);
+        xhci->erst.num_entries = ERST_NUM_SEGS;
+        xhci->erst.erst_dma_addr = dma;
+        xhci_dbg(xhci, "Set ERST to 0; private num segs = %i, virt addr = %p, dma addr = 0x%llx\n",
+                        xhci->erst.num_entries,
+                        xhci->erst.entries,
+                        (unsigned long long)xhci->erst.erst_dma_addr);
+
+        /* set ring base address and size for each segment table entry */
+        for (val = 0, seg = xhci->event_ring->first_seg; val < ERST_NUM_SEGS; val++) {
+                struct xhci_erst_entry *entry = &xhci->erst.entries[val];
+                entry->seg_addr[0] = seg->dma;
+                entry->seg_addr[1] = 0;
+                entry->seg_size = TRBS_PER_SEGMENT;
+                entry->rsvd = 0;
+                seg = seg->next;
+        }
+
+        /* set ERST count with the number of entries in the segment table */
+        val = xhci_readl(xhci, &xhci->ir_set->erst_size);
+        val &= ERST_SIZE_MASK;
+        val |= ERST_NUM_SEGS;
+        xhci_dbg(xhci, "// Write ERST size = %i to ir_set 0 (some bits preserved)\n",
+                        val);
+        xhci_writel(xhci, val, &xhci->ir_set->erst_size);
+
+        xhci_dbg(xhci, "// Set ERST entries to point to event ring.\n");
+        /* set the segment table base address */
+        xhci_dbg(xhci, "// Set ERST base address for ir_set 0 = 0x%llx\n",
+                        (unsigned long long)xhci->erst.erst_dma_addr);
+        val = xhci_readl(xhci, &xhci->ir_set->erst_base[0]);
+        val &= ERST_PTR_MASK;
+        val |= (xhci->erst.erst_dma_addr & ~ERST_PTR_MASK);
+        xhci_writel(xhci, val, &xhci->ir_set->erst_base[0]);
+        xhci_writel(xhci, 0, &xhci->ir_set->erst_base[1]);
+
+        /* Set the event ring dequeue address */
+        xhci_set_hc_event_deq(xhci);
+        xhci_dbg(xhci, "Wrote ERST address to ir_set 0.\n");
+        xhci_print_ir_set(xhci, xhci->ir_set, 0);
+
+        /*
+         * XXX: Might need to set the Interrupter Moderation Register to
+         * something other than the default (~1ms minimum between interrupts).
+         * See section 5.5.1.2.
+         */
+        init_completion(&xhci->addr_dev);
+        for (i = 0; i < MAX_HC_SLOTS; ++i)
+                xhci->devs[i] = 0;
+
+        return 0;
+fail:
+        xhci_warn(xhci, "Couldn't initialize memory\n");
+        xhci_mem_cleanup(xhci);
+        return -ENOMEM;
+}
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
new file mode 100644
index 000000000000..1462709e26c0
--- /dev/null
+++ b/drivers/usb/host/xhci-pci.c
@@ -0,0 +1,166 @@
+/*
+ * xHCI host controller driver PCI Bus Glue.
+ *
+ * Copyright (C) 2008 Intel Corp.
+ *
+ * Author: Sarah Sharp
+ * Some code borrowed from the Linux EHCI driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/pci.h>
+
+#include "xhci.h"
+
+static const char hcd_name[] = "xhci_hcd";
+
+/* called after powerup, by probe or system-pm "wakeup" */
+static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
+{
+        /*
+         * TODO: Implement finding debug ports later.
+         * TODO: see if there are any quirks that need to be added to handle
+         * new extended capabilities.
+         */
+
+        /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
+        if (!pci_set_mwi(pdev))
+                xhci_dbg(xhci, "MWI active\n");
+
+        xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
+        return 0;
+}
+
+/* called during probe() after chip reset completes */
+static int xhci_pci_setup(struct usb_hcd *hcd)
+{
+        struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
+        struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
+        int                     retval;
+
+        xhci->cap_regs = hcd->regs;
+        xhci->op_regs = hcd->regs +
+                HC_LENGTH(xhci_readl(xhci, &xhci->cap_regs->hc_capbase));
+        xhci->run_regs = hcd->regs +
+                (xhci_readl(xhci, &xhci->cap_regs->run_regs_off) & RTSOFF_MASK);
+        /* Cache read-only capability registers */
+        xhci->hcs_params1 = xhci_readl(xhci, &xhci->cap_regs->hcs_params1);
+        xhci->hcs_params2 = xhci_readl(xhci, &xhci->cap_regs->hcs_params2);
+        xhci->hcs_params3 = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
+        xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
+        xhci_print_registers(xhci);
+
+        /* Make sure the HC is halted. */
+        retval = xhci_halt(xhci);
+        if (retval)
+                return retval;
+
+        xhci_dbg(xhci, "Resetting HCD\n");
+        /* Reset the internal HC memory state and registers. */
+        retval = xhci_reset(xhci);
+        if (retval)
+                return retval;
+        xhci_dbg(xhci, "Reset complete\n");
+
+        xhci_dbg(xhci, "Calling HCD init\n");
+        /* Initialize HCD and host controller data structures. */
+        retval = xhci_init(hcd);
+        if (retval)
+                return retval;
+        xhci_dbg(xhci, "Called HCD init\n");
+
+        pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
+        xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
+
+        /* Find any debug ports */
+        return xhci_pci_reinit(xhci, pdev);
+}
+
+static const struct hc_driver xhci_pci_hc_driver = {
+        .description =          hcd_name,
+        .product_desc =         "xHCI Host Controller",
+        .hcd_priv_size =        sizeof(struct xhci_hcd),
+
+        /*
+         * generic hardware linkage
+         */
+        .irq =                  xhci_irq,
+        .flags =                HCD_MEMORY | HCD_USB3,
+
+        /*
+         * basic lifecycle operations
+         */
+        .reset =                xhci_pci_setup,
+        .start =                xhci_run,
+        /* suspend and resume implemented later */
+        .stop =                 xhci_stop,
+        .shutdown =             xhci_shutdown,
+
+        /*
+         * managing i/o requests and associated device resources
+         */
+        .urb_enqueue =          xhci_urb_enqueue,
+        .urb_dequeue =          xhci_urb_dequeue,
+        .alloc_dev =            xhci_alloc_dev,
+        .free_dev =             xhci_free_dev,
+        .add_endpoint =         xhci_add_endpoint,
+        .drop_endpoint =        xhci_drop_endpoint,
+        .check_bandwidth =      xhci_check_bandwidth,
+        .reset_bandwidth =      xhci_reset_bandwidth,
+        .address_device =       xhci_address_device,
+
+        /*
+         * scheduling support
+         */
+        .get_frame_number =     xhci_get_frame,
+
+        /* Root hub support */
+        .hub_control =          xhci_hub_control,
+        .hub_status_data =      xhci_hub_status_data,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* PCI driver selection metadata; PCI hotplugging uses this */
+static const struct pci_device_id pci_ids[] = { {
+        /* handle any USB 3.0 xHCI controller */
+        PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
+        .driver_data =  (unsigned long) &xhci_pci_hc_driver,
+        },
+        { /* end: all zeroes */ }
+};
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+/* pci driver glue; this is a "new style" PCI driver module */
+static struct pci_driver xhci_pci_driver = {
+        .name =         (char *) hcd_name,
+        .id_table =     pci_ids,
+
+        .probe =        usb_hcd_pci_probe,
+        .remove =       usb_hcd_pci_remove,
+        /* suspend and resume implemented later */
+
+        .shutdown =     usb_hcd_pci_shutdown,
+};
+
+int xhci_register_pci()
+{
+        return pci_register_driver(&xhci_pci_driver);
+}
+
+void xhci_unregister_pci()
+{
+        pci_unregister_driver(&xhci_pci_driver);
+}
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
new file mode 100644
index 000000000000..02d81985c454
--- /dev/null
+++ b/drivers/usb/host/xhci-ring.c
@@ -0,0 +1,1648 @@
+/*
+ * xHCI host controller driver
+ *
+ * Copyright (C) 2008 Intel Corp.
+ *
+ * Author: Sarah Sharp
+ * Some code borrowed from the Linux EHCI driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * Ring initialization rules:
+ * 1. Each segment is initialized to zero, except for link TRBs.
+ * 2. Ring cycle state = 0.  This represents Producer Cycle State (PCS) or
+ *    Consumer Cycle State (CCS), depending on ring function.
+ * 3. Enqueue pointer = dequeue pointer = address of first TRB in the segment.
+ *
+ * Ring behavior rules:
+ * 1. A ring is empty if enqueue == dequeue.  This means there will always be at
+ *    least one free TRB in the ring.  This is useful if you want to turn that
+ *    into a link TRB and expand the ring.
+ * 2. When incrementing an enqueue or dequeue pointer, if the next TRB is a
+ *    link TRB, then load the pointer with the address in the link TRB.  If the
+ *    link TRB had its toggle bit set, you may need to update the ring cycle
+ *    state (see cycle bit rules).  You may have to do this multiple times
+ *    until you reach a non-link TRB.
+ * 3. A ring is full if enqueue++ (for the definition of increment above)
+ *    equals the dequeue pointer.
+ *
+ * Cycle bit rules:
+ * 1. When a consumer increments a dequeue pointer and encounters a toggle bit
+ *    in a link TRB, it must toggle the ring cycle state.
+ * 2. When a producer increments an enqueue pointer and encounters a toggle bit
+ *    in a link TRB, it must toggle the ring cycle state.
+ *
+ * Producer rules:
+ * 1. Check if ring is full before you enqueue.
+ * 2. Write the ring cycle state to the cycle bit in the TRB you're enqueuing.
+ *    Update enqueue pointer between each write (which may update the ring
+ *    cycle state).
+ * 3. Notify consumer.  If SW is producer, it rings the doorbell for command
+ *    and endpoint rings.  If HC is the producer for the event ring,
+ *    and it generates an interrupt according to interrupt modulation rules.
+ *
+ * Consumer rules:
+ * 1. Check if TRB belongs to you.  If the cycle bit == your ring cycle state,
+ *    the TRB is owned by the consumer.
+ * 2. Update dequeue pointer (which may update the ring cycle state) and
+ *    continue processing TRBs until you reach a TRB which is not owned by you.
+ * 3. Notify the producer.  SW is the consumer for the event ring, and it
+ *   updates event ring dequeue pointer.  HC is the consumer for the command and
+ *   endpoint rings; it generates events on the event ring for these.
+ */
+
+#include <linux/scatterlist.h>
+#include "xhci.h"
+
+/*
+ * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA
+ * address of the TRB.
+ */
+dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg,
+                union xhci_trb *trb)
+{
+        unsigned long segment_offset;
+
+        if (!seg || !trb || trb < seg->trbs)
+                return 0;
+        /* offset in TRBs */
+        segment_offset = trb - seg->trbs;
+        if (segment_offset > TRBS_PER_SEGMENT)
+                return 0;
+        return seg->dma + (segment_offset * sizeof(*trb));
+}
+
+/* Does this link TRB point to the first segment in a ring,
+ * or was the previous TRB the last TRB on the last segment in the ERST?
+ */
+static inline bool last_trb_on_last_seg(struct xhci_hcd *xhci, struct xhci_ring *ring,
+                struct xhci_segment *seg, union xhci_trb *trb)
+{
+        if (ring == xhci->event_ring)
+                return (trb == &seg->trbs[TRBS_PER_SEGMENT]) &&
+                        (seg->next == xhci->event_ring->first_seg);
+        else
+                return trb->link.control & LINK_TOGGLE;
+}
+
+/* Is this TRB a link TRB or was the last TRB the last TRB in this event ring
+ * segment?  I.e. would the updated event TRB pointer step off the end of the
+ * event seg?
+ */
+static inline int last_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
+                struct xhci_segment *seg, union xhci_trb *trb)
+{
+        if (ring == xhci->event_ring)
+                return trb == &seg->trbs[TRBS_PER_SEGMENT];
+        else
+                return (trb->link.control & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK);
+}
+
+/* Updates trb to point to the next TRB in the ring, and updates seg if the next
+ * TRB is in a new segment.  This does not skip over link TRBs, and it does not
+ * effect the ring dequeue or enqueue pointers.
+ */
+static void next_trb(struct xhci_hcd *xhci,
+                struct xhci_ring *ring,
+                struct xhci_segment **seg,
+                union xhci_trb **trb)
+{
+        if (last_trb(xhci, ring, *seg, *trb)) {
+                *seg = (*seg)->next;
+                *trb = ((*seg)->trbs);
+        } else {
+                *trb = (*trb)++;
+        }
+}
+
+/*
+ * See Cycle bit rules. SW is the consumer for the event ring only.
+ * Don't make a ring full of link TRBs.  That would be dumb and this would loop.
+ */
+static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer)
+{
+        union xhci_trb *next = ++(ring->dequeue);
+
+        ring->deq_updates++;
+        /* Update the dequeue pointer further if that was a link TRB or we're at
+         * the end of an event ring segment (which doesn't have link TRBS)
+         */
+        while (last_trb(xhci, ring, ring->deq_seg, next)) {
+                if (consumer && last_trb_on_last_seg(xhci, ring, ring->deq_seg, next)) {
+                        ring->cycle_state = (ring->cycle_state ? 0 : 1);
+                        if (!in_interrupt())
+                                xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
+                                                ring,
+                                                (unsigned int) ring->cycle_state);
+                }
+                ring->deq_seg = ring->deq_seg->next;
+                ring->dequeue = ring->deq_seg->trbs;
+                next = ring->dequeue;
+        }
+}
+
+/*
+ * See Cycle bit rules. SW is the consumer for the event ring only.
+ * Don't make a ring full of link TRBs.  That would be dumb and this would loop.
+ *
+ * If we've just enqueued a TRB that is in the middle of a TD (meaning the
+ * chain bit is set), then set the chain bit in all the following link TRBs.
+ * If we've enqueued the last TRB in a TD, make sure the following link TRBs
+ * have their chain bit cleared (so that each Link TRB is a separate TD).
+ *
+ * Section 6.4.4.1 of the 0.95 spec says link TRBs cannot have the chain bit
+ * set, but other sections talk about dealing with the chain bit set.
+ * Assume section 6.4.4.1 is wrong, and the chain bit can be set in a Link TRB.
+ */
+static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer)
+{
+        u32 chain;
+        union xhci_trb *next;
+
+        chain = ring->enqueue->generic.field[3] & TRB_CHAIN;
+        next = ++(ring->enqueue);
+
+        ring->enq_updates++;
+        /* Update the dequeue pointer further if that was a link TRB or we're at
+         * the end of an event ring segment (which doesn't have link TRBS)
+         */
+        while (last_trb(xhci, ring, ring->enq_seg, next)) {
+                if (!consumer) {
+                        if (ring != xhci->event_ring) {
+                                next->link.control &= ~TRB_CHAIN;
+                                next->link.control |= chain;
+                                /* Give this link TRB to the hardware */
+                                wmb();
+                                if (next->link.control & TRB_CYCLE)
+                                        next->link.control &= (u32) ~TRB_CYCLE;
+                                else
+                                        next->link.control |= (u32) TRB_CYCLE;
+                        }
+                        /* Toggle the cycle bit after the last ring segment. */
+                        if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
+                                ring->cycle_state = (ring->cycle_state ? 0 : 1);
+                                if (!in_interrupt())
+                                        xhci_dbg(xhci, "Toggle cycle state for ring %p = %i\n",
+                                                        ring,
+                                                        (unsigned int) ring->cycle_state);
+                        }
+                }
+                ring->enq_seg = ring->enq_seg->next;
+                ring->enqueue = ring->enq_seg->trbs;
+                next = ring->enqueue;
+        }
+}
+
+/*
+ * Check to see if there's room to enqueue num_trbs on the ring.  See rules
+ * above.
+ * FIXME: this would be simpler and faster if we just kept track of the number
+ * of free TRBs in a ring.
+ */
+static int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring,
+                unsigned int num_trbs)
+{
+        int i;
+        union xhci_trb *enq = ring->enqueue;
+        struct xhci_segment *enq_seg = ring->enq_seg;
+
+        /* Check if ring is empty */
+        if (enq == ring->dequeue)
+                return 1;
+        /* Make sure there's an extra empty TRB available */
+        for (i = 0; i <= num_trbs; ++i) {
+                if (enq == ring->dequeue)
+                        return 0;
+                enq++;
+                while (last_trb(xhci, ring, enq_seg, enq)) {
+                        enq_seg = enq_seg->next;
+                        enq = enq_seg->trbs;
+                }
+        }
+        return 1;
+}
+
+void xhci_set_hc_event_deq(struct xhci_hcd *xhci)
+{
+        u32 temp;
+        dma_addr_t deq;
+
+        deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
+                        xhci->event_ring->dequeue);
+        if (deq == 0 && !in_interrupt())
+                xhci_warn(xhci, "WARN something wrong with SW event ring "
+                                "dequeue ptr.\n");
+        /* Update HC event ring dequeue pointer */
+        temp = xhci_readl(xhci, &xhci->ir_set->erst_dequeue[0]);
+        temp &= ERST_PTR_MASK;
+        if (!in_interrupt())
+                xhci_dbg(xhci, "// Write event ring dequeue pointer\n");
+        xhci_writel(xhci, 0, &xhci->ir_set->erst_dequeue[1]);
+        xhci_writel(xhci, (deq & ~ERST_PTR_MASK) | temp,
+                        &xhci->ir_set->erst_dequeue[0]);
+}
+
+/* Ring the host controller doorbell after placing a command on the ring */
+void xhci_ring_cmd_db(struct xhci_hcd *xhci)
+{
+        u32 temp;
+
+        xhci_dbg(xhci, "// Ding dong!\n");
+        temp = xhci_readl(xhci, &xhci->dba->doorbell[0]) & DB_MASK;
+        xhci_writel(xhci, temp | DB_TARGET_HOST, &xhci->dba->doorbell[0]);
+        /* Flush PCI posted writes */
+        xhci_readl(xhci, &xhci->dba->doorbell[0]);
+}
+
+static void ring_ep_doorbell(struct xhci_hcd *xhci,
+                unsigned int slot_id,
+                unsigned int ep_index)
+{
+        struct xhci_ring *ep_ring;
+        u32 field;
+        __u32 __iomem *db_addr = &xhci->dba->doorbell[slot_id];
+
+        ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
+        /* Don't ring the doorbell for this endpoint if there are pending
+         * cancellations because the we don't want to interrupt processing.
+         */
+        if (!ep_ring->cancels_pending && !(ep_ring->state & SET_DEQ_PENDING)) {
+                field = xhci_readl(xhci, db_addr) & DB_MASK;
+                xhci_writel(xhci, field | EPI_TO_DB(ep_index), db_addr);
+                /* Flush PCI posted writes - FIXME Matthew Wilcox says this
+                 * isn't time-critical and we shouldn't make the CPU wait for
+                 * the flush.
+                 */
+                xhci_readl(xhci, db_addr);
+        }
+}
+
+/*
+ * Find the segment that trb is in.  Start searching in start_seg.
+ * If we must move past a segment that has a link TRB with a toggle cycle state
+ * bit set, then we will toggle the value pointed at by cycle_state.
+ */
+static struct xhci_segment *find_trb_seg(
+                struct xhci_segment *start_seg,
+                union xhci_trb  *trb, int *cycle_state)
+{
+        struct xhci_segment *cur_seg = start_seg;
+        struct xhci_generic_trb *generic_trb;
+
+        while (cur_seg->trbs > trb ||
+                        &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) {
+                generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic;
+                if (TRB_TYPE(generic_trb->field[3]) == TRB_LINK &&
+                                (generic_trb->field[3] & LINK_TOGGLE))
+                        *cycle_state = ~(*cycle_state) & 0x1;
+                cur_seg = cur_seg->next;
+                if (cur_seg == start_seg)
+                        /* Looped over the entire list.  Oops! */
+                        return 0;
+        }
+        return cur_seg;
+}
+
+struct dequeue_state {
+        struct xhci_segment *new_deq_seg;
+        union xhci_trb *new_deq_ptr;
+        int new_cycle_state;
+};
+
+/*
+ * Move the xHC's endpoint ring dequeue pointer past cur_td.
+ * Record the new state of the xHC's endpoint ring dequeue segment,
+ * dequeue pointer, and new consumer cycle state in state.
+ * Update our internal representation of the ring's dequeue pointer.
+ *
+ * We do this in three jumps:
+ *  - First we update our new ring state to be the same as when the xHC stopped.
+ *  - Then we traverse the ring to find the segment that contains
+ *    the last TRB in the TD.  We toggle the xHC's new cycle state when we pass
+ *    any link TRBs with the toggle cycle bit set.
+ *  - Finally we move the dequeue state one TRB further, toggling the cycle bit
+ *    if we've moved it past a link TRB with the toggle cycle bit set.
+ */
+static void find_new_dequeue_state(struct xhci_hcd *xhci,
+                unsigned int slot_id, unsigned int ep_index,
+                struct xhci_td *cur_td, struct dequeue_state *state)
+{
+        struct xhci_virt_device *dev = xhci->devs[slot_id];
+        struct xhci_ring *ep_ring = dev->ep_rings[ep_index];
+        struct xhci_generic_trb *trb;
+
+        state->new_cycle_state = 0;
+        state->new_deq_seg = find_trb_seg(cur_td->start_seg,
+                        ep_ring->stopped_trb,
+                        &state->new_cycle_state);
+        if (!state->new_deq_seg)
+                BUG();
+        /* Dig out the cycle state saved by the xHC during the stop ep cmd */
+        state->new_cycle_state = 0x1 & dev->out_ctx->ep[ep_index].deq[0];
+
+        state->new_deq_ptr = cur_td->last_trb;
+        state->new_deq_seg = find_trb_seg(state->new_deq_seg,
+                        state->new_deq_ptr,
+                        &state->new_cycle_state);
+        if (!state->new_deq_seg)
+                BUG();
+
+        trb = &state->new_deq_ptr->generic;
+        if (TRB_TYPE(trb->field[3]) == TRB_LINK &&
+                                (trb->field[3] & LINK_TOGGLE))
+                state->new_cycle_state = ~(state->new_cycle_state) & 0x1;
+        next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr);
+
+        /* Don't update the ring cycle state for the producer (us). */
+        ep_ring->dequeue = state->new_deq_ptr;
+        ep_ring->deq_seg = state->new_deq_seg;
+}
+
+static void td_to_noop(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
+                struct xhci_td *cur_td)
+{
+        struct xhci_segment *cur_seg;
+        union xhci_trb *cur_trb;
+
+        for (cur_seg = cur_td->start_seg, cur_trb = cur_td->first_trb;
+                        true;
+                        next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
+                if ((cur_trb->generic.field[3] & TRB_TYPE_BITMASK) ==
+                                TRB_TYPE(TRB_LINK)) {
+                        /* Unchain any chained Link TRBs, but
+                         * leave the pointers intact.
+                         */
+                        cur_trb->generic.field[3] &= ~TRB_CHAIN;
+                        xhci_dbg(xhci, "Cancel (unchain) link TRB\n");
+                        xhci_dbg(xhci, "Address = %p (0x%llx dma); "
+                                        "in seg %p (0x%llx dma)\n",
+                                        cur_trb,
+                                        (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
+                                        cur_seg,
+                                        (unsigned long long)cur_seg->dma);
+                } else {
+                        cur_trb->generic.field[0] = 0;
+                        cur_trb->generic.field[1] = 0;
+                        cur_trb->generic.field[2] = 0;
+                        /* Preserve only the cycle bit of this TRB */
+                        cur_trb->generic.field[3] &= TRB_CYCLE;
+                        cur_trb->generic.field[3] |= TRB_TYPE(TRB_TR_NOOP);
+                        xhci_dbg(xhci, "Cancel TRB %p (0x%llx dma) "
+                                        "in seg %p (0x%llx dma)\n",
+                                        cur_trb,
+                                        (unsigned long long)xhci_trb_virt_to_dma(cur_seg, cur_trb),
+                                        cur_seg,
+                                        (unsigned long long)cur_seg->dma);
+                }
+                if (cur_trb == cur_td->last_trb)
+                        break;
+        }
+}
+
+static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
+                unsigned int ep_index, struct xhci_segment *deq_seg,
+                union xhci_trb *deq_ptr, u32 cycle_state);
+
+/*
+ * When we get a command completion for a Stop Endpoint Command, we need to
+ * unlink any cancelled TDs from the ring.  There are two ways to do that:
+ *
+ *  1. If the HW was in the middle of processing the TD that needs to be
+ *     cancelled, then we must move the ring's dequeue pointer past the last TRB
+ *     in the TD with a Set Dequeue Pointer Command.
+ *  2. Otherwise, we turn all the TRBs in the TD into No-op TRBs (with the chain
+ *     bit cleared) so that the HW will skip over them.
+ */
+static void handle_stopped_endpoint(struct xhci_hcd *xhci,
+                union xhci_trb *trb)
+{
+        unsigned int slot_id;
+        unsigned int ep_index;
+        struct xhci_ring *ep_ring;
+        struct list_head *entry;
+        struct xhci_td *cur_td = 0;
+        struct xhci_td *last_unlinked_td;
+
+        struct dequeue_state deq_state;
+#ifdef CONFIG_USB_HCD_STAT
+        ktime_t stop_time = ktime_get();
+#endif
+
+        memset(&deq_state, 0, sizeof(deq_state));
+        slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]);
+        ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]);
+        ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
+
+        if (list_empty(&ep_ring->cancelled_td_list))
+                return;
+
+        /* Fix up the ep ring first, so HW stops executing cancelled TDs.
+         * We have the xHCI lock, so nothing can modify this list until we drop
+         * it.  We're also in the event handler, so we can't get re-interrupted
+         * if another Stop Endpoint command completes
+         */
+        list_for_each(entry, &ep_ring->cancelled_td_list) {
+                cur_td = list_entry(entry, struct xhci_td, cancelled_td_list);
+                xhci_dbg(xhci, "Cancelling TD starting at %p, 0x%llx (dma).\n",
+                                cur_td->first_trb,
+                                (unsigned long long)xhci_trb_virt_to_dma(cur_td->start_seg, cur_td->first_trb));
+                /*
+                 * If we stopped on the TD we need to cancel, then we have to
+                 * move the xHC endpoint ring dequeue pointer past this TD.
+                 */
+                if (cur_td == ep_ring->stopped_td)
+                        find_new_dequeue_state(xhci, slot_id, ep_index, cur_td,
+                                        &deq_state);
+                else
+                        td_to_noop(xhci, ep_ring, cur_td);
+                /*
+                 * The event handler won't see a completion for this TD anymore,
+                 * so remove it from the endpoint ring's TD list.  Keep it in
+                 * the cancelled TD list for URB completion later.
+                 */
+                list_del(&cur_td->td_list);
+                ep_ring->cancels_pending--;
+        }
+        last_unlinked_td = cur_td;
+
+        /* If necessary, queue a Set Transfer Ring Dequeue Pointer command */
+        if (deq_state.new_deq_ptr && deq_state.new_deq_seg) {
+                xhci_dbg(xhci, "Set TR Deq Ptr cmd, new deq seg = %p (0x%llx dma), "
+                                "new deq ptr = %p (0x%llx dma), new cycle = %u\n",
+                                deq_state.new_deq_seg,
+                                (unsigned long long)deq_state.new_deq_seg->dma,
+                                deq_state.new_deq_ptr,
+                                (unsigned long long)xhci_trb_virt_to_dma(deq_state.new_deq_seg, deq_state.new_deq_ptr),
+                                deq_state.new_cycle_state);
+                queue_set_tr_deq(xhci, slot_id, ep_index,
+                                deq_state.new_deq_seg,
+                                deq_state.new_deq_ptr,
+                                (u32) deq_state.new_cycle_state);
+                /* Stop the TD queueing code from ringing the doorbell until
+                 * this command completes.  The HC won't set the dequeue pointer
+                 * if the ring is running, and ringing the doorbell starts the
+                 * ring running.
+                 */
+                ep_ring->state |= SET_DEQ_PENDING;
+                xhci_ring_cmd_db(xhci);
+        } else {
+                /* Otherwise just ring the doorbell to restart the ring */
+                ring_ep_doorbell(xhci, slot_id, ep_index);
+        }
+
+        /*
+         * Drop the lock and complete the URBs in the cancelled TD list.
+         * New TDs to be cancelled might be added to the end of the list before
+         * we can complete all the URBs for the TDs we already unlinked.
+         * So stop when we've completed the URB for the last TD we unlinked.
+         */
+        do {
+                cur_td = list_entry(ep_ring->cancelled_td_list.next,
+                                struct xhci_td, cancelled_td_list);
+                list_del(&cur_td->cancelled_td_list);
+
+                /* Clean up the cancelled URB */
+#ifdef CONFIG_USB_HCD_STAT
+                hcd_stat_update(xhci->tp_stat, cur_td->urb->actual_length,
+                                ktime_sub(stop_time, cur_td->start_time));
+#endif
+                cur_td->urb->hcpriv = NULL;
+                usb_hcd_unlink_urb_from_ep(xhci_to_hcd(xhci), cur_td->urb);
+
+                xhci_dbg(xhci, "Giveback cancelled URB %p\n", cur_td->urb);
+                spin_unlock(&xhci->lock);
+                /* Doesn't matter what we pass for status, since the core will
+                 * just overwrite it (because the URB has been unlinked).
+                 */
+                usb_hcd_giveback_urb(xhci_to_hcd(xhci), cur_td->urb, 0);
+                kfree(cur_td);
+
+                spin_lock(&xhci->lock);
+        } while (cur_td != last_unlinked_td);
+
+        /* Return to the event handler with xhci->lock re-acquired */
+}
+
+/*
+ * When we get a completion for a Set Transfer Ring Dequeue Pointer command,
+ * we need to clear the set deq pending flag in the endpoint ring state, so that
+ * the TD queueing code can ring the doorbell again.  We also need to ring the
+ * endpoint doorbell to restart the ring, but only if there aren't more
+ * cancellations pending.
+ */
+static void handle_set_deq_completion(struct xhci_hcd *xhci,
+                struct xhci_event_cmd *event,
+                union xhci_trb *trb)
+{
+        unsigned int slot_id;
+        unsigned int ep_index;
+        struct xhci_ring *ep_ring;
+        struct xhci_virt_device *dev;
+
+        slot_id = TRB_TO_SLOT_ID(trb->generic.field[3]);
+        ep_index = TRB_TO_EP_INDEX(trb->generic.field[3]);
+        dev = xhci->devs[slot_id];
+        ep_ring = dev->ep_rings[ep_index];
+
+        if (GET_COMP_CODE(event->status) != COMP_SUCCESS) {
+                unsigned int ep_state;
+                unsigned int slot_state;
+
+                switch (GET_COMP_CODE(event->status)) {
+                case COMP_TRB_ERR:
+                        xhci_warn(xhci, "WARN Set TR Deq Ptr cmd invalid because "
+                                        "of stream ID configuration\n");
+                        break;
+                case COMP_CTX_STATE:
+                        xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed due "
+                                        "to incorrect slot or ep state.\n");
+                        ep_state = dev->out_ctx->ep[ep_index].ep_info;
+                        ep_state &= EP_STATE_MASK;
+                        slot_state = dev->out_ctx->slot.dev_state;
+                        slot_state = GET_SLOT_STATE(slot_state);
+                        xhci_dbg(xhci, "Slot state = %u, EP state = %u\n",
+                                        slot_state, ep_state);
+                        break;
+                case COMP_EBADSLT:
+                        xhci_warn(xhci, "WARN Set TR Deq Ptr cmd failed because "
+                                        "slot %u was not enabled.\n", slot_id);
+                        break;
+                default:
+                        xhci_warn(xhci, "WARN Set TR Deq Ptr cmd with unknown "
+                                        "completion code of %u.\n",
+                                        GET_COMP_CODE(event->status));
+                        break;
+                }
+                /* OK what do we do now?  The endpoint state is hosed, and we
+                 * should never get to this point if the synchronization between
+                 * queueing, and endpoint state are correct.  This might happen
+                 * if the device gets disconnected after we've finished
+                 * cancelling URBs, which might not be an error...
+                 */
+        } else {
+                xhci_dbg(xhci, "Successful Set TR Deq Ptr cmd, deq[0] = 0x%x, "
+                                "deq[1] = 0x%x.\n",
+                                dev->out_ctx->ep[ep_index].deq[0],
+                                dev->out_ctx->ep[ep_index].deq[1]);
+        }
+
+        ep_ring->state &= ~SET_DEQ_PENDING;
+        ring_ep_doorbell(xhci, slot_id, ep_index);
+}
+
+
+static void handle_cmd_completion(struct xhci_hcd *xhci,
+                struct xhci_event_cmd *event)
+{
+        int slot_id = TRB_TO_SLOT_ID(event->flags);
+        u64 cmd_dma;
+        dma_addr_t cmd_dequeue_dma;
+
+        cmd_dma = (((u64) event->cmd_trb[1]) << 32) + event->cmd_trb[0];
+        cmd_dequeue_dma = xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg,
+                        xhci->cmd_ring->dequeue);
+        /* Is the command ring deq ptr out of sync with the deq seg ptr? */
+        if (cmd_dequeue_dma == 0) {
+                xhci->error_bitmask |= 1 << 4;
+                return;
+        }
+        /* Does the DMA address match our internal dequeue pointer address? */
+        if (cmd_dma != (u64) cmd_dequeue_dma) {
+                xhci->error_bitmask |= 1 << 5;
+                return;
+        }
+        switch (xhci->cmd_ring->dequeue->generic.field[3] & TRB_TYPE_BITMASK) {
+        case TRB_TYPE(TRB_ENABLE_SLOT):
+                if (GET_COMP_CODE(event->status) == COMP_SUCCESS)
+                        xhci->slot_id = slot_id;
+                else
+                        xhci->slot_id = 0;
+                complete(&xhci->addr_dev);
+                break;
+        case TRB_TYPE(TRB_DISABLE_SLOT):
+                if (xhci->devs[slot_id])
+                        xhci_free_virt_device(xhci, slot_id);
+                break;
+        case TRB_TYPE(TRB_CONFIG_EP):
+                xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status);
+                complete(&xhci->devs[slot_id]->cmd_completion);
+                break;
+        case TRB_TYPE(TRB_ADDR_DEV):
+                xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(event->status);
+                complete(&xhci->addr_dev);
+                break;
+        case TRB_TYPE(TRB_STOP_RING):
+                handle_stopped_endpoint(xhci, xhci->cmd_ring->dequeue);
+                break;
+        case TRB_TYPE(TRB_SET_DEQ):
+                handle_set_deq_completion(xhci, event, xhci->cmd_ring->dequeue);
+                break;
+        case TRB_TYPE(TRB_CMD_NOOP):
+                ++xhci->noops_handled;
+                break;
+        default:
+                /* Skip over unknown commands on the event ring */
+                xhci->error_bitmask |= 1 << 6;
+                break;
+        }
+        inc_deq(xhci, xhci->cmd_ring, false);
+}
+
+static void handle_port_status(struct xhci_hcd *xhci,
+                union xhci_trb *event)
+{
+        u32 port_id;
+
+        /* Port status change events always have a successful completion code */
+        if (GET_COMP_CODE(event->generic.field[2]) != COMP_SUCCESS) {
+                xhci_warn(xhci, "WARN: xHC returned failed port status event\n");
+                xhci->error_bitmask |= 1 << 8;
+        }
+        /* FIXME: core doesn't care about all port link state changes yet */
+        port_id = GET_PORT_ID(event->generic.field[0]);
+        xhci_dbg(xhci, "Port Status Change Event for port %d\n", port_id);
+
+        /* Update event ring dequeue pointer before dropping the lock */
+        inc_deq(xhci, xhci->event_ring, true);
+        xhci_set_hc_event_deq(xhci);
+
+        spin_unlock(&xhci->lock);
+        /* Pass this up to the core */
+        usb_hcd_poll_rh_status(xhci_to_hcd(xhci));
+        spin_lock(&xhci->lock);
+}
+
+/*
+ * This TD is defined by the TRBs starting at start_trb in start_seg and ending
+ * at end_trb, which may be in another segment.  If the suspect DMA address is a
+ * TRB in this TD, this function returns that TRB's segment.  Otherwise it
+ * returns 0.
+ */
+static struct xhci_segment *trb_in_td(
+                struct xhci_segment *start_seg,
+                union xhci_trb  *start_trb,
+                union xhci_trb  *end_trb,
+                dma_addr_t      suspect_dma)
+{
+        dma_addr_t start_dma;
+        dma_addr_t end_seg_dma;
+        dma_addr_t end_trb_dma;
+        struct xhci_segment *cur_seg;
+
+        start_dma = xhci_trb_virt_to_dma(start_seg, start_trb);
+        cur_seg = start_seg;
+
+        do {
+                /* We may get an event for a Link TRB in the middle of a TD */
+                end_seg_dma = xhci_trb_virt_to_dma(cur_seg,
+                                &start_seg->trbs[TRBS_PER_SEGMENT - 1]);
+                /* If the end TRB isn't in this segment, this is set to 0 */
+                end_trb_dma = xhci_trb_virt_to_dma(cur_seg, end_trb);
+
+                if (end_trb_dma > 0) {
+                        /* The end TRB is in this segment, so suspect should be here */
+                        if (start_dma <= end_trb_dma) {
+                                if (suspect_dma >= start_dma && suspect_dma <= end_trb_dma)
+                                        return cur_seg;
+                        } else {
+                                /* Case for one segment with
+                                 * a TD wrapped around to the top
+                                 */
+                                if ((suspect_dma >= start_dma &&
+                                                        suspect_dma <= end_seg_dma) ||
+                                                (suspect_dma >= cur_seg->dma &&
+                                                 suspect_dma <= end_trb_dma))
+                                        return cur_seg;
+                        }
+                        return 0;
+                } else {
+                        /* Might still be somewhere in this segment */
+                        if (suspect_dma >= start_dma && suspect_dma <= end_seg_dma)
+                                return cur_seg;
+                }
+                cur_seg = cur_seg->next;
+                start_dma = xhci_trb_virt_to_dma(cur_seg, &cur_seg->trbs[0]);
+        } while (1);
+
+}
+
+/*
+ * If this function returns an error condition, it means it got a Transfer
+ * event with a corrupted Slot ID, Endpoint ID, or TRB DMA address.
+ * At this point, the host controller is probably hosed and should be reset.
+ */
+static int handle_tx_event(struct xhci_hcd *xhci,
+                struct xhci_transfer_event *event)
+{
+        struct xhci_virt_device *xdev;
+        struct xhci_ring *ep_ring;
+        int ep_index;
+        struct xhci_td *td = 0;
+        dma_addr_t event_dma;
+        struct xhci_segment *event_seg;
+        union xhci_trb *event_trb;
+        struct urb *urb = 0;
+        int status = -EINPROGRESS;
+
+        xdev = xhci->devs[TRB_TO_SLOT_ID(event->flags)];
+        if (!xdev) {
+                xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n");
+                return -ENODEV;
+        }
+
+        /* Endpoint ID is 1 based, our index is zero based */
+        ep_index = TRB_TO_EP_ID(event->flags) - 1;
+        ep_ring = xdev->ep_rings[ep_index];
+        if (!ep_ring || (xdev->out_ctx->ep[ep_index].ep_info & EP_STATE_MASK) == EP_STATE_DISABLED) {
+                xhci_err(xhci, "ERROR Transfer event pointed to disabled endpoint\n");
+                return -ENODEV;
+        }
+
+        event_dma = event->buffer[0];
+        if (event->buffer[1] != 0)
+                xhci_warn(xhci, "WARN ignoring upper 32-bits of 64-bit TRB dma address\n");
+
+        /* This TRB should be in the TD at the head of this ring's TD list */
+        if (list_empty(&ep_ring->td_list)) {
+                xhci_warn(xhci, "WARN Event TRB for slot %d ep %d with no TDs queued?\n",
+                                TRB_TO_SLOT_ID(event->flags), ep_index);
+                xhci_dbg(xhci, "Event TRB with TRB type ID %u\n",
+                                (unsigned int) (event->flags & TRB_TYPE_BITMASK)>>10);
+                xhci_print_trb_offsets(xhci, (union xhci_trb *) event);
+                urb = NULL;
+                goto cleanup;
+        }
+        td = list_entry(ep_ring->td_list.next, struct xhci_td, td_list);
+
+        /* Is this a TRB in the currently executing TD? */
+        event_seg = trb_in_td(ep_ring->deq_seg, ep_ring->dequeue,
+                        td->last_trb, event_dma);
+        if (!event_seg) {
+                /* HC is busted, give up! */
+                xhci_err(xhci, "ERROR Transfer event TRB DMA ptr not part of current TD\n");
+                return -ESHUTDOWN;
+        }
+        event_trb = &event_seg->trbs[(event_dma - event_seg->dma) / sizeof(*event_trb)];
+        xhci_dbg(xhci, "Event TRB with TRB type ID %u\n",
+                        (unsigned int) (event->flags & TRB_TYPE_BITMASK)>>10);
+        xhci_dbg(xhci, "Offset 0x00 (buffer[0]) = 0x%x\n",
+                        (unsigned int) event->buffer[0]);
+        xhci_dbg(xhci, "Offset 0x04 (buffer[0]) = 0x%x\n",
+                        (unsigned int) event->buffer[1]);
+        xhci_dbg(xhci, "Offset 0x08 (transfer length) = 0x%x\n",
+                        (unsigned int) event->transfer_len);
+        xhci_dbg(xhci, "Offset 0x0C (flags) = 0x%x\n",
+                        (unsigned int) event->flags);
+
+        /* Look for common error cases */
+        switch (GET_COMP_CODE(event->transfer_len)) {
+        /* Skip codes that require special handling depending on
+         * transfer type
+         */
+        case COMP_SUCCESS:
+        case COMP_SHORT_TX:
+                break;
+        case COMP_STOP:
+                xhci_dbg(xhci, "Stopped on Transfer TRB\n");
+                break;
+        case COMP_STOP_INVAL:
+                xhci_dbg(xhci, "Stopped on No-op or Link TRB\n");
+                break;
+        case COMP_STALL:
+                xhci_warn(xhci, "WARN: Stalled endpoint\n");
+                status = -EPIPE;
+                break;
+        case COMP_TRB_ERR:
+                xhci_warn(xhci, "WARN: TRB error on endpoint\n");
+                status = -EILSEQ;
+                break;
+        case COMP_TX_ERR:
+                xhci_warn(xhci, "WARN: transfer error on endpoint\n");
+                status = -EPROTO;
+                break;
+        case COMP_DB_ERR:
+                xhci_warn(xhci, "WARN: HC couldn't access mem fast enough\n");
+                status = -ENOSR;
+                break;
+        default:
+                xhci_warn(xhci, "ERROR Unknown event condition, HC probably busted\n");
+                urb = NULL;
+                goto cleanup;
+        }
+        /* Now update the urb's actual_length and give back to the core */
+        /* Was this a control transfer? */
+        if (usb_endpoint_xfer_control(&td->urb->ep->desc)) {
+                xhci_debug_trb(xhci, xhci->event_ring->dequeue);
+                switch (GET_COMP_CODE(event->transfer_len)) {
+                case COMP_SUCCESS:
+                        if (event_trb == ep_ring->dequeue) {
+                                xhci_warn(xhci, "WARN: Success on ctrl setup TRB without IOC set??\n");
+                                status = -ESHUTDOWN;
+                        } else if (event_trb != td->last_trb) {
+                                xhci_warn(xhci, "WARN: Success on ctrl data TRB without IOC set??\n");
+                                status = -ESHUTDOWN;
+                        } else {
+                                xhci_dbg(xhci, "Successful control transfer!\n");
+                                status = 0;
+                        }
+                        break;
+                case COMP_SHORT_TX:
+                        xhci_warn(xhci, "WARN: short transfer on control ep\n");
+                        status = -EREMOTEIO;
+                        break;
+                default:
+                        /* Others already handled above */
+                        break;
+                }
+                /*
+                 * Did we transfer any data, despite the errors that might have
+                 * happened?  I.e. did we get past the setup stage?
+                 */
+                if (event_trb != ep_ring->dequeue) {
+                        /* The event was for the status stage */
+                        if (event_trb == td->last_trb) {
+                                td->urb->actual_length =
+                                        td->urb->transfer_buffer_length;
+                        } else {
+                        /* Maybe the event was for the data stage? */
+                                if (GET_COMP_CODE(event->transfer_len) != COMP_STOP_INVAL)
+                                        /* We didn't stop on a link TRB in the middle */
+                                        td->urb->actual_length =
+                                                td->urb->transfer_buffer_length -
+                                                TRB_LEN(event->transfer_len);
+                        }
+                }
+        } else {
+                switch (GET_COMP_CODE(event->transfer_len)) {
+                case COMP_SUCCESS:
+                        /* Double check that the HW transferred everything. */
+                        if (event_trb != td->last_trb) {
+                                xhci_warn(xhci, "WARN Successful completion "
+                                                "on short TX\n");
+                                if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
+                                        status = -EREMOTEIO;
+                                else
+                                        status = 0;
+                        } else {
+                                xhci_dbg(xhci, "Successful bulk transfer!\n");
+                                status = 0;
+                        }
+                        break;
+                case COMP_SHORT_TX:
+                        if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
+                                status = -EREMOTEIO;
+                        else
+                                status = 0;
+                        break;
+                default:
+                        /* Others already handled above */
+                        break;
+                }
+                dev_dbg(&td->urb->dev->dev,
+                                "ep %#x - asked for %d bytes, "
+                                "%d bytes untransferred\n",
+                                td->urb->ep->desc.bEndpointAddress,
+                                td->urb->transfer_buffer_length,
+                                TRB_LEN(event->transfer_len));
+                /* Fast path - was this the last TRB in the TD for this URB? */
+                if (event_trb == td->last_trb) {
+                        if (TRB_LEN(event->transfer_len) != 0) {
+                                td->urb->actual_length =
+                                        td->urb->transfer_buffer_length -
+                                        TRB_LEN(event->transfer_len);
+                                if (td->urb->actual_length < 0) {
+                                        xhci_warn(xhci, "HC gave bad length "
+                                                        "of %d bytes left\n",
+                                                        TRB_LEN(event->transfer_len));
+                                        td->urb->actual_length = 0;
+                                }
+                                if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
+                                        status = -EREMOTEIO;
+                                else
+                                        status = 0;
+                        } else {
+                                td->urb->actual_length = td->urb->transfer_buffer_length;
+                                /* Ignore a short packet completion if the
+                                 * untransferred length was zero.
+                                 */
+                                status = 0;
+                        }
+                } else {
+                        /* Slow path - walk the list, starting from the dequeue
+                         * pointer, to get the actual length transferred.
+                         */
+                        union xhci_trb *cur_trb;
+                        struct xhci_segment *cur_seg;
+
+                        td->urb->actual_length = 0;
+                        for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg;
+                                        cur_trb != event_trb;
+                                        next_trb(xhci, ep_ring, &cur_seg, &cur_trb)) {
+                                if (TRB_TYPE(cur_trb->generic.field[3]) != TRB_TR_NOOP &&
+                                                TRB_TYPE(cur_trb->generic.field[3]) != TRB_LINK)
+                                        td->urb->actual_length +=
+                                                TRB_LEN(cur_trb->generic.field[2]);
+                        }
+                        /* If the ring didn't stop on a Link or No-op TRB, add
+                         * in the actual bytes transferred from the Normal TRB
+                         */
+                        if (GET_COMP_CODE(event->transfer_len) != COMP_STOP_INVAL)
+                                td->urb->actual_length +=
+                                        TRB_LEN(cur_trb->generic.field[2]) -
+                                        TRB_LEN(event->transfer_len);
+                }
+        }
+        /* The Endpoint Stop Command completion will take care of
+         * any stopped TDs.  A stopped TD may be restarted, so don't update the
+         * ring dequeue pointer or take this TD off any lists yet.
+         */
+        if (GET_COMP_CODE(event->transfer_len) == COMP_STOP_INVAL ||
+                        GET_COMP_CODE(event->transfer_len) == COMP_STOP) {
+                ep_ring->stopped_td = td;
+                ep_ring->stopped_trb = event_trb;
+        } else {
+                /* Update ring dequeue pointer */
+                while (ep_ring->dequeue != td->last_trb)
+                        inc_deq(xhci, ep_ring, false);
+                inc_deq(xhci, ep_ring, false);
+
+                /* Clean up the endpoint's TD list */
+                urb = td->urb;
+                list_del(&td->td_list);
+                /* Was this TD slated to be cancelled but completed anyway? */
+                if (!list_empty(&td->cancelled_td_list)) {
+                        list_del(&td->cancelled_td_list);
+                        ep_ring->cancels_pending--;
+                }
+                kfree(td);
+                urb->hcpriv = NULL;
+        }
+cleanup:
+        inc_deq(xhci, xhci->event_ring, true);
+        xhci_set_hc_event_deq(xhci);
+
+        /* FIXME for multi-TD URBs (who have buffers bigger than 64MB) */
+        if (urb) {
+                usb_hcd_unlink_urb_from_ep(xhci_to_hcd(xhci), urb);
+                spin_unlock(&xhci->lock);
+                usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, status);
+                spin_lock(&xhci->lock);
+        }
+        return 0;
+}
+
+/*
+ * This function handles all OS-owned events on the event ring.  It may drop
+ * xhci->lock between event processing (e.g. to pass up port status changes).
+ */
+void xhci_handle_event(struct xhci_hcd *xhci)
+{
+        union xhci_trb *event;
+        int update_ptrs = 1;
+        int ret;
+
+        if (!xhci->event_ring || !xhci->event_ring->dequeue) {
+                xhci->error_bitmask |= 1 << 1;
+                return;
+        }
+
+        event = xhci->event_ring->dequeue;
+        /* Does the HC or OS own the TRB? */
+        if ((event->event_cmd.flags & TRB_CYCLE) !=
+                        xhci->event_ring->cycle_state) {
+                xhci->error_bitmask |= 1 << 2;
+                return;
+        }
+
+        /* FIXME: Handle more event types. */
+        switch ((event->event_cmd.flags & TRB_TYPE_BITMASK)) {
+        case TRB_TYPE(TRB_COMPLETION):
+                handle_cmd_completion(xhci, &event->event_cmd);
+                break;
+        case TRB_TYPE(TRB_PORT_STATUS):
+                handle_port_status(xhci, event);
+                update_ptrs = 0;
+                break;
+        case TRB_TYPE(TRB_TRANSFER):
+                ret = handle_tx_event(xhci, &event->trans_event);
+                if (ret < 0)
+                        xhci->error_bitmask |= 1 << 9;
+                else
+                        update_ptrs = 0;
+                break;
+        default:
+                xhci->error_bitmask |= 1 << 3;
+        }
+
+        if (update_ptrs) {
+                /* Update SW and HC event ring dequeue pointer */
+                inc_deq(xhci, xhci->event_ring, true);
+                xhci_set_hc_event_deq(xhci);
+        }
+        /* Are there more items on the event ring? */
+        xhci_handle_event(xhci);
+}
+
+/****           Endpoint Ring Operations        ****/
+
+/*
+ * Generic function for queueing a TRB on a ring.
+ * The caller must have checked to make sure there's room on the ring.
+ */
+static void queue_trb(struct xhci_hcd *xhci, struct xhci_ring *ring,
+                bool consumer,
+                u32 field1, u32 field2, u32 field3, u32 field4)
+{
+        struct xhci_generic_trb *trb;
+
+        trb = &ring->enqueue->generic;
+        trb->field[0] = field1;
+        trb->field[1] = field2;
+        trb->field[2] = field3;
+        trb->field[3] = field4;
+        inc_enq(xhci, ring, consumer);
+}
+
+/*
+ * Does various checks on the endpoint ring, and makes it ready to queue num_trbs.
+ * FIXME allocate segments if the ring is full.
+ */
+static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
+                u32 ep_state, unsigned int num_trbs, gfp_t mem_flags)
+{
+        /* Make sure the endpoint has been added to xHC schedule */
+        xhci_dbg(xhci, "Endpoint state = 0x%x\n", ep_state);
+        switch (ep_state) {
+        case EP_STATE_DISABLED:
+                /*
+                 * USB core changed config/interfaces without notifying us,
+                 * or hardware is reporting the wrong state.
+                 */
+                xhci_warn(xhci, "WARN urb submitted to disabled ep\n");
+                return -ENOENT;
+        case EP_STATE_HALTED:
+        case EP_STATE_ERROR:
+                xhci_warn(xhci, "WARN waiting for halt or error on ep "
+                                "to be cleared\n");
+                /* FIXME event handling code for error needs to clear it */
+                /* XXX not sure if this should be -ENOENT or not */
+                return -EINVAL;
+        case EP_STATE_STOPPED:
+        case EP_STATE_RUNNING:
+                break;
+        default:
+                xhci_err(xhci, "ERROR unknown endpoint state for ep\n");
+                /*
+                 * FIXME issue Configure Endpoint command to try to get the HC
+                 * back into a known state.
+                 */
+                return -EINVAL;
+        }
+        if (!room_on_ring(xhci, ep_ring, num_trbs)) {
+                /* FIXME allocate more room */
+                xhci_err(xhci, "ERROR no room on ep ring\n");
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+static int prepare_transfer(struct xhci_hcd *xhci,
+                struct xhci_virt_device *xdev,
+                unsigned int ep_index,
+                unsigned int num_trbs,
+                struct urb *urb,
+                struct xhci_td **td,
+                gfp_t mem_flags)
+{
+        int ret;
+
+        ret = prepare_ring(xhci, xdev->ep_rings[ep_index],
+                        xdev->out_ctx->ep[ep_index].ep_info & EP_STATE_MASK,
+                        num_trbs, mem_flags);
+        if (ret)
+                return ret;
+        *td = kzalloc(sizeof(struct xhci_td), mem_flags);
+        if (!*td)
+                return -ENOMEM;
+        INIT_LIST_HEAD(&(*td)->td_list);
+        INIT_LIST_HEAD(&(*td)->cancelled_td_list);
+
+        ret = usb_hcd_link_urb_to_ep(xhci_to_hcd(xhci), urb);
+        if (unlikely(ret)) {
+                kfree(*td);
+                return ret;
+        }
+
+        (*td)->urb = urb;
+        urb->hcpriv = (void *) (*td);
+        /* Add this TD to the tail of the endpoint ring's TD list */
+        list_add_tail(&(*td)->td_list, &xdev->ep_rings[ep_index]->td_list);
+        (*td)->start_seg = xdev->ep_rings[ep_index]->enq_seg;
+        (*td)->first_trb = xdev->ep_rings[ep_index]->enqueue;
+
+        return 0;
+}
+
+static unsigned int count_sg_trbs_needed(struct xhci_hcd *xhci, struct urb *urb)
+{
+        int num_sgs, num_trbs, running_total, temp, i;
+        struct scatterlist *sg;
+
+        sg = NULL;
+        num_sgs = urb->num_sgs;
+        temp = urb->transfer_buffer_length;
+
+        xhci_dbg(xhci, "count sg list trbs: \n");
+        num_trbs = 0;
+        for_each_sg(urb->sg->sg, sg, num_sgs, i) {
+                unsigned int previous_total_trbs = num_trbs;
+                unsigned int len = sg_dma_len(sg);
+
+                /* Scatter gather list entries may cross 64KB boundaries */
+                running_total = TRB_MAX_BUFF_SIZE -
+                        (sg_dma_address(sg) & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+                if (running_total != 0)
+                        num_trbs++;
+
+                /* How many more 64KB chunks to transfer, how many more TRBs? */
+                while (running_total < sg_dma_len(sg)) {
+                        num_trbs++;
+                        running_total += TRB_MAX_BUFF_SIZE;
+                }
+                xhci_dbg(xhci, " sg #%d: dma = %#llx, len = %#x (%d), num_trbs = %d\n",
+                                i, (unsigned long long)sg_dma_address(sg),
+                                len, len, num_trbs - previous_total_trbs);
+
+                len = min_t(int, len, temp);
+                temp -= len;
+                if (temp == 0)
+                        break;
+        }
+        xhci_dbg(xhci, "\n");
+        if (!in_interrupt())
+                dev_dbg(&urb->dev->dev, "ep %#x - urb len = %d, sglist used, num_trbs = %d\n",
+                                urb->ep->desc.bEndpointAddress,
+                                urb->transfer_buffer_length,
+                                num_trbs);
+        return num_trbs;
+}
+
+static void check_trb_math(struct urb *urb, int num_trbs, int running_total)
+{
+        if (num_trbs != 0)
+                dev_dbg(&urb->dev->dev, "%s - ep %#x - Miscalculated number of "
+                                "TRBs, %d left\n", __func__,
+                                urb->ep->desc.bEndpointAddress, num_trbs);
+        if (running_total != urb->transfer_buffer_length)
+                dev_dbg(&urb->dev->dev, "%s - ep %#x - Miscalculated tx length, "
+                                "queued %#x (%d), asked for %#x (%d)\n",
+                                __func__,
+                                urb->ep->desc.bEndpointAddress,
+                                running_total, running_total,
+                                urb->transfer_buffer_length,
+                                urb->transfer_buffer_length);
+}
+
+static void giveback_first_trb(struct xhci_hcd *xhci, int slot_id,
+                unsigned int ep_index, int start_cycle,
+                struct xhci_generic_trb *start_trb, struct xhci_td *td)
+{
+        /*
+         * Pass all the TRBs to the hardware at once and make sure this write
+         * isn't reordered.
+         */
+        wmb();
+        start_trb->field[3] |= start_cycle;
+        ring_ep_doorbell(xhci, slot_id, ep_index);
+}
+
+static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
+                struct urb *urb, int slot_id, unsigned int ep_index)
+{
+        struct xhci_ring *ep_ring;
+        unsigned int num_trbs;
+        struct xhci_td *td;
+        struct scatterlist *sg;
+        int num_sgs;
+        int trb_buff_len, this_sg_len, running_total;
+        bool first_trb;
+        u64 addr;
+
+        struct xhci_generic_trb *start_trb;
+        int start_cycle;
+
+        ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
+        num_trbs = count_sg_trbs_needed(xhci, urb);
+        num_sgs = urb->num_sgs;
+
+        trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id],
+                        ep_index, num_trbs, urb, &td, mem_flags);
+        if (trb_buff_len < 0)
+                return trb_buff_len;
+        /*
+         * Don't give the first TRB to the hardware (by toggling the cycle bit)
+         * until we've finished creating all the other TRBs.  The ring's cycle
+         * state may change as we enqueue the other TRBs, so save it too.
+         */
+        start_trb = &ep_ring->enqueue->generic;
+        start_cycle = ep_ring->cycle_state;
+
+        running_total = 0;
+        /*
+         * How much data is in the first TRB?
+         *
+         * There are three forces at work for TRB buffer pointers and lengths:
+         * 1. We don't want to walk off the end of this sg-list entry buffer.
+         * 2. The transfer length that the driver requested may be smaller than
+         *    the amount of memory allocated for this scatter-gather list.
+         * 3. TRBs buffers can't cross 64KB boundaries.
+         */
+        sg = urb->sg->sg;
+        addr = (u64) sg_dma_address(sg);
+        this_sg_len = sg_dma_len(sg);
+        trb_buff_len = TRB_MAX_BUFF_SIZE -
+                (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+        trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
+        if (trb_buff_len > urb->transfer_buffer_length)
+                trb_buff_len = urb->transfer_buffer_length;
+        xhci_dbg(xhci, "First length to xfer from 1st sglist entry = %u\n",
+                        trb_buff_len);
+
+        first_trb = true;
+        /* Queue the first TRB, even if it's zero-length */
+        do {
+                u32 field = 0;
+
+                /* Don't change the cycle bit of the first TRB until later */
+                if (first_trb)
+                        first_trb = false;
+                else
+                        field |= ep_ring->cycle_state;
+
+                /* Chain all the TRBs together; clear the chain bit in the last
+                 * TRB to indicate it's the last TRB in the chain.
+                 */
+                if (num_trbs > 1) {
+                        field |= TRB_CHAIN;
+                } else {
+                        /* FIXME - add check for ZERO_PACKET flag before this */
+                        td->last_trb = ep_ring->enqueue;
+                        field |= TRB_IOC;
+                }
+                xhci_dbg(xhci, " sg entry: dma = %#x, len = %#x (%d), "
+                                "64KB boundary at %#x, end dma = %#x\n",
+                                (unsigned int) addr, trb_buff_len, trb_buff_len,
+                                (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
+                                (unsigned int) addr + trb_buff_len);
+                if (TRB_MAX_BUFF_SIZE -
+                                (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)) < trb_buff_len) {
+                        xhci_warn(xhci, "WARN: sg dma xfer crosses 64KB boundaries!\n");
+                        xhci_dbg(xhci, "Next boundary at %#x, end dma = %#x\n",
+                                        (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1),
+                                        (unsigned int) addr + trb_buff_len);
+                }
+                queue_trb(xhci, ep_ring, false,
+                                (u32) addr,
+                                (u32) ((u64) addr >> 32),
+                                TRB_LEN(trb_buff_len) | TRB_INTR_TARGET(0),
+                                /* We always want to know if the TRB was short,
+                                 * or we won't get an event when it completes.
+                                 * (Unless we use event data TRBs, which are a
+                                 * waste of space and HC resources.)
+                                 */
+                                field | TRB_ISP | TRB_TYPE(TRB_NORMAL));
+                --num_trbs;
+                running_total += trb_buff_len;
+
+                /* Calculate length for next transfer --
+                 * Are we done queueing all the TRBs for this sg entry?
+                 */
+                this_sg_len -= trb_buff_len;
+                if (this_sg_len == 0) {
+                        --num_sgs;
+                        if (num_sgs == 0)
+                                break;
+                        sg = sg_next(sg);
+                        addr = (u64) sg_dma_address(sg);
+                        this_sg_len = sg_dma_len(sg);
+                } else {
+                        addr += trb_buff_len;
+                }
+
+                trb_buff_len = TRB_MAX_BUFF_SIZE -
+                        (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+                trb_buff_len = min_t(int, trb_buff_len, this_sg_len);
+                if (running_total + trb_buff_len > urb->transfer_buffer_length)
+                        trb_buff_len =
+                                urb->transfer_buffer_length - running_total;
+        } while (running_total < urb->transfer_buffer_length);
+
+        check_trb_math(urb, num_trbs, running_total);
+        giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td);
+        return 0;
+}
+
+/* This is very similar to what ehci-q.c qtd_fill() does */
+int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
+                struct urb *urb, int slot_id, unsigned int ep_index)
+{
+        struct xhci_ring *ep_ring;
+        struct xhci_td *td;
+        int num_trbs;
+        struct xhci_generic_trb *start_trb;
+        bool first_trb;
+        int start_cycle;
+        u32 field;
+
+        int running_total, trb_buff_len, ret;
+        u64 addr;
+
+        if (urb->sg)
+                return queue_bulk_sg_tx(xhci, mem_flags, urb, slot_id, ep_index);
+
+        ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
+
+        num_trbs = 0;
+        /* How much data is (potentially) left before the 64KB boundary? */
+        running_total = TRB_MAX_BUFF_SIZE -
+                (urb->transfer_dma & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+
+        /* If there's some data on this 64KB chunk, or we have to send a
+         * zero-length transfer, we need at least one TRB
+         */
+        if (running_total != 0 || urb->transfer_buffer_length == 0)
+                num_trbs++;
+        /* How many more 64KB chunks to transfer, how many more TRBs? */
+        while (running_total < urb->transfer_buffer_length) {
+                num_trbs++;
+                running_total += TRB_MAX_BUFF_SIZE;
+        }
+        /* FIXME: this doesn't deal with URB_ZERO_PACKET - need one more */
+
+        if (!in_interrupt())
+                dev_dbg(&urb->dev->dev, "ep %#x - urb len = %#x (%d), addr = %#llx, num_trbs = %d\n",
+                                urb->ep->desc.bEndpointAddress,
+                                urb->transfer_buffer_length,
+                                urb->transfer_buffer_length,
+                                (unsigned long long)urb->transfer_dma,
+                                num_trbs);
+
+        ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index,
+                        num_trbs, urb, &td, mem_flags);
+        if (ret < 0)
+                return ret;
+
+        /*
+         * Don't give the first TRB to the hardware (by toggling the cycle bit)
+         * until we've finished creating all the other TRBs.  The ring's cycle
+         * state may change as we enqueue the other TRBs, so save it too.
+         */
+        start_trb = &ep_ring->enqueue->generic;
+        start_cycle = ep_ring->cycle_state;
+
+        running_total = 0;
+        /* How much data is in the first TRB? */
+        addr = (u64) urb->transfer_dma;
+        trb_buff_len = TRB_MAX_BUFF_SIZE -
+                (urb->transfer_dma & ((1 << TRB_MAX_BUFF_SHIFT) - 1));
+        if (urb->transfer_buffer_length < trb_buff_len)
+                trb_buff_len = urb->transfer_buffer_length;
+
+        first_trb = true;
+
+        /* Queue the first TRB, even if it's zero-length */
+        do {
+                field = 0;
+
+                /* Don't change the cycle bit of the first TRB until later */
+                if (first_trb)
+                        first_trb = false;
+                else
+                        field |= ep_ring->cycle_state;
+
+                /* Chain all the TRBs together; clear the chain bit in the last
+                 * TRB to indicate it's the last TRB in the chain.
+                 */
+                if (num_trbs > 1) {
+                        field |= TRB_CHAIN;
+                } else {
+                        /* FIXME - add check for ZERO_PACKET flag before this */
+                        td->last_trb = ep_ring->enqueue;
+                        field |= TRB_IOC;
+                }
+                queue_trb(xhci, ep_ring, false,
+                                (u32) addr,
+                                (u32) ((u64) addr >> 32),
+                                TRB_LEN(trb_buff_len) | TRB_INTR_TARGET(0),
+                                /* We always want to know if the TRB was short,
+                                 * or we won't get an event when it completes.
+                                 * (Unless we use event data TRBs, which are a
+                                 * waste of space and HC resources.)
+                                 */
+                                field | TRB_ISP | TRB_TYPE(TRB_NORMAL));
+                --num_trbs;
+                running_total += trb_buff_len;
+
+                /* Calculate length for next transfer */
+                addr += trb_buff_len;
+                trb_buff_len = urb->transfer_buffer_length - running_total;
+                if (trb_buff_len > TRB_MAX_BUFF_SIZE)
+                        trb_buff_len = TRB_MAX_BUFF_SIZE;
+        } while (running_total < urb->transfer_buffer_length);
+
+        check_trb_math(urb, num_trbs, running_total);
+        giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td);
+        return 0;
+}
+
+/* Caller must have locked xhci->lock */
+int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
+                struct urb *urb, int slot_id, unsigned int ep_index)
+{
+        struct xhci_ring *ep_ring;
+        int num_trbs;
+        int ret;
+        struct usb_ctrlrequest *setup;
+        struct xhci_generic_trb *start_trb;
+        int start_cycle;
+        u32 field;
+        struct xhci_td *td;
+
+        ep_ring = xhci->devs[slot_id]->ep_rings[ep_index];
+
+        /*
+         * Need to copy setup packet into setup TRB, so we can't use the setup
+         * DMA address.
+         */
+        if (!urb->setup_packet)
+                return -EINVAL;
+
+        if (!in_interrupt())
+                xhci_dbg(xhci, "Queueing ctrl tx for slot id %d, ep %d\n",
+                                slot_id, ep_index);
+        /* 1 TRB for setup, 1 for status */
+        num_trbs = 2;
+        /*
+         * Don't need to check if we need additional event data and normal TRBs,
+         * since data in control transfers will never get bigger than 16MB
+         * XXX: can we get a buffer that crosses 64KB boundaries?
+         */
+        if (urb->transfer_buffer_length > 0)
+                num_trbs++;
+        ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, num_trbs,
+                        urb, &td, mem_flags);
+        if (ret < 0)
+                return ret;
+
+        /*
+         * Don't give the first TRB to the hardware (by toggling the cycle bit)
+         * until we've finished creating all the other TRBs.  The ring's cycle
+         * state may change as we enqueue the other TRBs, so save it too.
+         */
+        start_trb = &ep_ring->enqueue->generic;
+        start_cycle = ep_ring->cycle_state;
+
+        /* Queue setup TRB - see section 6.4.1.2.1 */
+        /* FIXME better way to translate setup_packet into two u32 fields? */
+        setup = (struct usb_ctrlrequest *) urb->setup_packet;
+        queue_trb(xhci, ep_ring, false,
+                        /* FIXME endianness is probably going to bite my ass here. */
+                        setup->bRequestType | setup->bRequest << 8 | setup->wValue << 16,
+                        setup->wIndex | setup->wLength << 16,
+                        TRB_LEN(8) | TRB_INTR_TARGET(0),
+                        /* Immediate data in pointer */
+                        TRB_IDT | TRB_TYPE(TRB_SETUP));
+
+        /* If there's data, queue data TRBs */
+        field = 0;
+        if (urb->transfer_buffer_length > 0) {
+                if (setup->bRequestType & USB_DIR_IN)
+                        field |= TRB_DIR_IN;
+                queue_trb(xhci, ep_ring, false,
+                                lower_32_bits(urb->transfer_dma),
+                                upper_32_bits(urb->transfer_dma),
+                                TRB_LEN(urb->transfer_buffer_length) | TRB_INTR_TARGET(0),
+                                /* Event on short tx */
+                                field | TRB_ISP | TRB_TYPE(TRB_DATA) | ep_ring->cycle_state);
+        }
+
+        /* Save the DMA address of the last TRB in the TD */
+        td->last_trb = ep_ring->enqueue;
+
+        /* Queue status TRB - see Table 7 and sections 4.11.2.2 and 6.4.1.2.3 */
+        /* If the device sent data, the status stage is an OUT transfer */
+        if (urb->transfer_buffer_length > 0 && setup->bRequestType & USB_DIR_IN)
+                field = 0;
+        else
+                field = TRB_DIR_IN;
+        queue_trb(xhci, ep_ring, false,
+                        0,
+                        0,
+                        TRB_INTR_TARGET(0),
+                        /* Event on completion */
+                        field | TRB_IOC | TRB_TYPE(TRB_STATUS) | ep_ring->cycle_state);
+
+        giveback_first_trb(xhci, slot_id, ep_index, start_cycle, start_trb, td);
+        return 0;
+}
+
+/****           Command Ring Operations         ****/
+
+/* Generic function for queueing a command TRB on the command ring */
+static int queue_command(struct xhci_hcd *xhci, u32 field1, u32 field2, u32 field3, u32 field4)
+{
+        if (!room_on_ring(xhci, xhci->cmd_ring, 1)) {
+                if (!in_interrupt())
+                        xhci_err(xhci, "ERR: No room for command on command ring\n");
+                return -ENOMEM;
+        }
+        queue_trb(xhci, xhci->cmd_ring, false, field1, field2, field3,
+                        field4 | xhci->cmd_ring->cycle_state);
+        return 0;
+}
+
+/* Queue a no-op command on the command ring */
+static int queue_cmd_noop(struct xhci_hcd *xhci)
+{
+        return queue_command(xhci, 0, 0, 0, TRB_TYPE(TRB_CMD_NOOP));
+}
+
+/*
+ * Place a no-op command on the command ring to test the command and
+ * event ring.
+ */
+void *xhci_setup_one_noop(struct xhci_hcd *xhci)
+{
+        if (queue_cmd_noop(xhci) < 0)
+                return NULL;
+        xhci->noops_submitted++;
+        return xhci_ring_cmd_db;
+}
+
+/* Queue a slot enable or disable request on the command ring */
+int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id)
+{
+        return queue_command(xhci, 0, 0, 0,
+                        TRB_TYPE(trb_type) | SLOT_ID_FOR_TRB(slot_id));
+}
+
+/* Queue an address device command TRB */
+int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
+                u32 slot_id)
+{
+        return queue_command(xhci, in_ctx_ptr, 0, 0,
+                        TRB_TYPE(TRB_ADDR_DEV) | SLOT_ID_FOR_TRB(slot_id));
+}
+
+/* Queue a configure endpoint command TRB */
+int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
+                u32 slot_id)
+{
+        return queue_command(xhci, in_ctx_ptr, 0, 0,
+                        TRB_TYPE(TRB_CONFIG_EP) | SLOT_ID_FOR_TRB(slot_id));
+}
+
+int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id,
+                unsigned int ep_index)
+{
+        u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id);
+        u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
+        u32 type = TRB_TYPE(TRB_STOP_RING);
+
+        return queue_command(xhci, 0, 0, 0,
+                        trb_slot_id | trb_ep_index | type);
+}
+
+/* Set Transfer Ring Dequeue Pointer command.
+ * This should not be used for endpoints that have streams enabled.
+ */
+static int queue_set_tr_deq(struct xhci_hcd *xhci, int slot_id,
+                unsigned int ep_index, struct xhci_segment *deq_seg,
+                union xhci_trb *deq_ptr, u32 cycle_state)
+{
+        dma_addr_t addr;
+        u32 trb_slot_id = SLOT_ID_FOR_TRB(slot_id);
+        u32 trb_ep_index = EP_ID_FOR_TRB(ep_index);
+        u32 type = TRB_TYPE(TRB_SET_DEQ);
+
+        addr = xhci_trb_virt_to_dma(deq_seg, deq_ptr);
+        if (addr == 0)
+                xhci_warn(xhci, "WARN Cannot submit Set TR Deq Ptr\n");
+                xhci_warn(xhci, "WARN deq seg = %p, deq pt = %p\n",
+                                deq_seg, deq_ptr);
+        return queue_command(xhci, (u32) addr | cycle_state, 0, 0,
+                        trb_slot_id | trb_ep_index | type);
+}
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
new file mode 100644
index 000000000000..8936eeb5588b
--- /dev/null
+++ b/drivers/usb/host/xhci.h
@@ -0,0 +1,1157 @@
+/*
+ * xHCI host controller driver
+ *
+ * Copyright (C) 2008 Intel Corp.
+ *
+ * Author: Sarah Sharp
+ * Some code borrowed from the Linux EHCI driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __LINUX_XHCI_HCD_H
+#define __LINUX_XHCI_HCD_H
+
+#include <linux/usb.h>
+#include <linux/timer.h>
+
+#include "../core/hcd.h"
+/* Code sharing between pci-quirks and xhci hcd */
+#include        "xhci-ext-caps.h"
+
+/* xHCI PCI Configuration Registers */
+#define XHCI_SBRN_OFFSET        (0x60)
+
+/* Max number of USB devices for any host controller - limit in section 6.1 */
+#define MAX_HC_SLOTS            256
+/* Section 5.3.3 - MaxPorts */
+#define MAX_HC_PORTS            127
+
+/*
+ * xHCI register interface.
+ * This corresponds to the eXtensible Host Controller Interface (xHCI)
+ * Revision 0.95 specification
+ *
+ * Registers should always be accessed with double word or quad word accesses.
+ *
+ * Some xHCI implementations may support 64-bit address pointers.  Registers
+ * with 64-bit address pointers should be written to with dword accesses by
+ * writing the low dword first (ptr[0]), then the high dword (ptr[1]) second.
+ * xHCI implementations that do not support 64-bit address pointers will ignore
+ * the high dword, and write order is irrelevant.
+ */
+
+/**
+ * struct xhci_cap_regs - xHCI Host Controller Capability Registers.
+ * @hc_capbase:         length of the capabilities register and HC version number
+ * @hcs_params1:        HCSPARAMS1 - Structural Parameters 1
+ * @hcs_params2:        HCSPARAMS2 - Structural Parameters 2
+ * @hcs_params3:        HCSPARAMS3 - Structural Parameters 3
+ * @hcc_params:         HCCPARAMS - Capability Parameters
+ * @db_off:             DBOFF - Doorbell array offset
+ * @run_regs_off:       RTSOFF - Runtime register space offset
+ */
+struct xhci_cap_regs {
+        u32     hc_capbase;
+        u32     hcs_params1;
+        u32     hcs_params2;
+        u32     hcs_params3;
+        u32     hcc_params;
+        u32     db_off;
+        u32     run_regs_off;
+        /* Reserved up to (CAPLENGTH - 0x1C) */
+};
+
+/* hc_capbase bitmasks */
+/* bits 7:0 - how long is the Capabilities register */
+#define HC_LENGTH(p)            XHCI_HC_LENGTH(p)
+/* bits 31:16   */
+#define HC_VERSION(p)           (((p) >> 16) & 0xffff)
+
+/* HCSPARAMS1 - hcs_params1 - bitmasks */
+/* bits 0:7, Max Device Slots */
+#define HCS_MAX_SLOTS(p)        (((p) >> 0) & 0xff)
+#define HCS_SLOTS_MASK          0xff
+/* bits 8:18, Max Interrupters */
+#define HCS_MAX_INTRS(p)        (((p) >> 8) & 0x7ff)
+/* bits 24:31, Max Ports - max value is 0x7F = 127 ports */
+#define HCS_MAX_PORTS(p)        (((p) >> 24) & 0x7f)
+
+/* HCSPARAMS2 - hcs_params2 - bitmasks */
+/* bits 0:3, frames or uframes that SW needs to queue transactions
+ * ahead of the HW to meet periodic deadlines */
+#define HCS_IST(p)              (((p) >> 0) & 0xf)
+/* bits 4:7, max number of Event Ring segments */
+#define HCS_ERST_MAX(p)         (((p) >> 4) & 0xf)
+/* bit 26 Scratchpad restore - for save/restore HW state - not used yet */
+/* bits 27:31 number of Scratchpad buffers SW must allocate for the HW */
+
+/* HCSPARAMS3 - hcs_params3 - bitmasks */
+/* bits 0:7, Max U1 to U0 latency for the roothub ports */
+#define HCS_U1_LATENCY(p)       (((p) >> 0) & 0xff)
+/* bits 16:31, Max U2 to U0 latency for the roothub ports */
+#define HCS_U2_LATENCY(p)       (((p) >> 16) & 0xffff)
+
+/* HCCPARAMS - hcc_params - bitmasks */
+/* true: HC can use 64-bit address pointers */
+#define HCC_64BIT_ADDR(p)       ((p) & (1 << 0))
+/* true: HC can do bandwidth negotiation */
+#define HCC_BANDWIDTH_NEG(p)    ((p) & (1 << 1))
+/* true: HC uses 64-byte Device Context structures
+ * FIXME 64-byte context structures aren't supported yet.
+ */
+#define HCC_64BYTE_CONTEXT(p)   ((p) & (1 << 2))
+/* true: HC has port power switches */
+#define HCC_PPC(p)              ((p) & (1 << 3))
+/* true: HC has port indicators */
+#define HCS_INDICATOR(p)        ((p) & (1 << 4))
+/* true: HC has Light HC Reset Capability */
+#define HCC_LIGHT_RESET(p)      ((p) & (1 << 5))
+/* true: HC supports latency tolerance messaging */
+#define HCC_LTC(p)              ((p) & (1 << 6))
+/* true: no secondary Stream ID Support */
+#define HCC_NSS(p)              ((p) & (1 << 7))
+/* Max size for Primary Stream Arrays - 2^(n+1), where n is bits 12:15 */
+#define HCC_MAX_PSA             (1 << ((((p) >> 12) & 0xf) + 1))
+/* Extended Capabilities pointer from PCI base - section 5.3.6 */
+#define HCC_EXT_CAPS(p)         XHCI_HCC_EXT_CAPS(p)
+
+/* db_off bitmask - bits 0:1 reserved */
+#define DBOFF_MASK      (~0x3)
+
+/* run_regs_off bitmask - bits 0:4 reserved */
+#define RTSOFF_MASK     (~0x1f)
+
+
+/* Number of registers per port */
+#define NUM_PORT_REGS   4
+
+/**
+ * struct xhci_op_regs - xHCI Host Controller Operational Registers.
+ * @command:            USBCMD - xHC command register
+ * @status:             USBSTS - xHC status register
+ * @page_size:          This indicates the page size that the host controller
+ *                      supports.  If bit n is set, the HC supports a page size
+ *                      of 2^(n+12), up to a 128MB page size.
+ *                      4K is the minimum page size.
+ * @cmd_ring:           CRP - 64-bit Command Ring Pointer
+ * @dcbaa_ptr:          DCBAAP - 64-bit Device Context Base Address Array Pointer
+ * @config_reg:         CONFIG - Configure Register
+ * @port_status_base:   PORTSCn - base address for Port Status and Control
+ *                      Each port has a Port Status and Control register,
+ *                      followed by a Port Power Management Status and Control
+ *                      register, a Port Link Info register, and a reserved
+ *                      register.
+ * @port_power_base:    PORTPMSCn - base address for
+ *                      Port Power Management Status and Control
+ * @port_link_base:     PORTLIn - base address for Port Link Info (current
+ *                      Link PM state and control) for USB 2.1 and USB 3.0
+ *                      devices.
+ */
+struct xhci_op_regs {
+        u32     command;
+        u32     status;
+        u32     page_size;
+        u32     reserved1;
+        u32     reserved2;
+        u32     dev_notification;
+        u32     cmd_ring[2];
+        /* rsvd: offset 0x20-2F */
+        u32     reserved3[4];
+        u32     dcbaa_ptr[2];
+        u32     config_reg;
+        /* rsvd: offset 0x3C-3FF */
+        u32     reserved4[241];
+        /* port 1 registers, which serve as a base address for other ports */
+        u32     port_status_base;
+        u32     port_power_base;
+        u32     port_link_base;
+        u32     reserved5;
+        /* registers for ports 2-255 */
+        u32     reserved6[NUM_PORT_REGS*254];
+};
+
+/* USBCMD - USB command - command bitmasks */
+/* start/stop HC execution - do not write unless HC is halted*/
+#define CMD_RUN         XHCI_CMD_RUN
+/* Reset HC - resets internal HC state machine and all registers (except
+ * PCI config regs).  HC does NOT drive a USB reset on the downstream ports.
+ * The xHCI driver must reinitialize the xHC after setting this bit.
+ */
+#define CMD_RESET       (1 << 1)
+/* Event Interrupt Enable - a '1' allows interrupts from the host controller */
+#define CMD_EIE         XHCI_CMD_EIE
+/* Host System Error Interrupt Enable - get out-of-band signal for HC errors */
+#define CMD_HSEIE       XHCI_CMD_HSEIE
+/* bits 4:6 are reserved (and should be preserved on writes). */
+/* light reset (port status stays unchanged) - reset completed when this is 0 */
+#define CMD_LRESET      (1 << 7)
+/* FIXME: ignoring host controller save/restore state for now. */
+#define CMD_CSS         (1 << 8)
+#define CMD_CRS         (1 << 9)
+/* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
+#define CMD_EWE         XHCI_CMD_EWE
+/* MFINDEX power management - '1' means xHC can stop MFINDEX counter if all root
+ * hubs are in U3 (selective suspend), disconnect, disabled, or powered-off.
+ * '0' means the xHC can power it off if all ports are in the disconnect,
+ * disabled, or powered-off state.
+ */
+#define CMD_PM_INDEX    (1 << 11)
+/* bits 12:31 are reserved (and should be preserved on writes). */
+
+/* USBSTS - USB status - status bitmasks */
+/* HC not running - set to 1 when run/stop bit is cleared. */
+#define STS_HALT        XHCI_STS_HALT
+/* serious error, e.g. PCI parity error.  The HC will clear the run/stop bit. */
+#define STS_FATAL       (1 << 2)
+/* event interrupt - clear this prior to clearing any IP flags in IR set*/
+#define STS_EINT        (1 << 3)
+/* port change detect */
+#define STS_PORT        (1 << 4)
+/* bits 5:7 reserved and zeroed */
+/* save state status - '1' means xHC is saving state */
+#define STS_SAVE        (1 << 8)
+/* restore state status - '1' means xHC is restoring state */
+#define STS_RESTORE     (1 << 9)
+/* true: save or restore error */
+#define STS_SRE         (1 << 10)
+/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
+#define STS_CNR         XHCI_STS_CNR
+/* true: internal Host Controller Error - SW needs to reset and reinitialize */
+#define STS_HCE         (1 << 12)
+/* bits 13:31 reserved and should be preserved */
+
+/*
+ * DNCTRL - Device Notification Control Register - dev_notification bitmasks
+ * Generate a device notification event when the HC sees a transaction with a
+ * notification type that matches a bit set in this bit field.
+ */
+#define DEV_NOTE_MASK           (0xffff)
+#define ENABLE_DEV_NOTE(x)      (1 << x)
+/* Most of the device notification types should only be used for debug.
+ * SW does need to pay attention to function wake notifications.
+ */
+#define DEV_NOTE_FWAKE          ENABLE_DEV_NOTE(1)
+
+/* CRCR - Command Ring Control Register - cmd_ring bitmasks */
+/* bit 0 is the command ring cycle state */
+/* stop ring operation after completion of the currently executing command */
+#define CMD_RING_PAUSE          (1 << 1)
+/* stop ring immediately - abort the currently executing command */
+#define CMD_RING_ABORT          (1 << 2)
+/* true: command ring is running */
+#define CMD_RING_RUNNING        (1 << 3)
+/* bits 4:5 reserved and should be preserved */
+/* Command Ring pointer - bit mask for the lower 32 bits. */
+#define CMD_RING_ADDR_MASK      (0xffffffc0)
+
+/* CONFIG - Configure Register - config_reg bitmasks */
+/* bits 0:7 - maximum number of device slots enabled (NumSlotsEn) */
+#define MAX_DEVS(p)     ((p) & 0xff)
+/* bits 8:31 - reserved and should be preserved */
+
+/* PORTSC - Port Status and Control Register - port_status_base bitmasks */
+/* true: device connected */
+#define PORT_CONNECT    (1 << 0)
+/* true: port enabled */
+#define PORT_PE         (1 << 1)
+/* bit 2 reserved and zeroed */
+/* true: port has an over-current condition */
+#define PORT_OC         (1 << 3)
+/* true: port reset signaling asserted */
+#define PORT_RESET      (1 << 4)
+/* Port Link State - bits 5:8
+ * A read gives the current link PM state of the port,
+ * a write with Link State Write Strobe set sets the link state.
+ */
+/* true: port has power (see HCC_PPC) */
+#define PORT_POWER      (1 << 9)
+/* bits 10:13 indicate device speed:
+ * 0 - undefined speed - port hasn't be initialized by a reset yet
+ * 1 - full speed
+ * 2 - low speed
+ * 3 - high speed
+ * 4 - super speed
+ * 5-15 reserved
+ */
+#define DEV_SPEED_MASK          (0xf << 10)
+#define XDEV_FS                 (0x1 << 10)
+#define XDEV_LS                 (0x2 << 10)
+#define XDEV_HS                 (0x3 << 10)
+#define XDEV_SS                 (0x4 << 10)
+#define DEV_UNDEFSPEED(p)       (((p) & DEV_SPEED_MASK) == (0x0<<10))
+#define DEV_FULLSPEED(p)        (((p) & DEV_SPEED_MASK) == XDEV_FS)
+#define DEV_LOWSPEED(p)         (((p) & DEV_SPEED_MASK) == XDEV_LS)
+#define DEV_HIGHSPEED(p)        (((p) & DEV_SPEED_MASK) == XDEV_HS)
+#define DEV_SUPERSPEED(p)       (((p) & DEV_SPEED_MASK) == XDEV_SS)
+/* Bits 20:23 in the Slot Context are the speed for the device */
+#define SLOT_SPEED_FS           (XDEV_FS << 10)
+#define SLOT_SPEED_LS           (XDEV_LS << 10)
+#define SLOT_SPEED_HS           (XDEV_HS << 10)
+#define SLOT_SPEED_SS           (XDEV_SS << 10)
+/* Port Indicator Control */
+#define PORT_LED_OFF    (0 << 14)
+#define PORT_LED_AMBER  (1 << 14)
+#define PORT_LED_GREEN  (2 << 14)
+#define PORT_LED_MASK   (3 << 14)
+/* Port Link State Write Strobe - set this when changing link state */
+#define PORT_LINK_STROBE        (1 << 16)
+/* true: connect status change */
+#define PORT_CSC        (1 << 17)
+/* true: port enable change */
+#define PORT_PEC        (1 << 18)
+/* true: warm reset for a USB 3.0 device is done.  A "hot" reset puts the port
+ * into an enabled state, and the device into the default state.  A "warm" reset
+ * also resets the link, forcing the device through the link training sequence.
+ * SW can also look at the Port Reset register to see when warm reset is done.
+ */
+#define PORT_WRC        (1 << 19)
+/* true: over-current change */
+#define PORT_OCC        (1 << 20)
+/* true: reset change - 1 to 0 transition of PORT_RESET */
+#define PORT_RC         (1 << 21)
+/* port link status change - set on some port link state transitions:
+ *  Transition                          Reason
+ *  ------------------------------------------------------------------------------
+ *  - U3 to Resume                      Wakeup signaling from a device
+ *  - Resume to Recovery to U0          USB 3.0 device resume
+ *  - Resume to U0                      USB 2.0 device resume
+ *  - U3 to Recovery to U0              Software resume of USB 3.0 device complete
+ *  - U3 to U0                          Software resume of USB 2.0 device complete
+ *  - U2 to U0                          L1 resume of USB 2.1 device complete
+ *  - U0 to U0 (???)                    L1 entry rejection by USB 2.1 device
+ *  - U0 to disabled                    L1 entry error with USB 2.1 device
+ *  - Any state to inactive             Error on USB 3.0 port
+ */
+#define PORT_PLC        (1 << 22)
+/* port configure error change - port failed to configure its link partner */
+#define PORT_CEC        (1 << 23)
+/* bit 24 reserved */
+/* wake on connect (enable) */
+#define PORT_WKCONN_E   (1 << 25)
+/* wake on disconnect (enable) */
+#define PORT_WKDISC_E   (1 << 26)
+/* wake on over-current (enable) */
+#define PORT_WKOC_E     (1 << 27)
+/* bits 28:29 reserved */
+/* true: device is removable - for USB 3.0 roothub emulation */
+#define PORT_DEV_REMOVE (1 << 30)
+/* Initiate a warm port reset - complete when PORT_WRC is '1' */
+#define PORT_WR         (1 << 31)
+
+/* Port Power Management Status and Control - port_power_base bitmasks */
+/* Inactivity timer value for transitions into U1, in microseconds.
+ * Timeout can be up to 127us.  0xFF means an infinite timeout.
+ */
+#define PORT_U1_TIMEOUT(p)      ((p) & 0xff)
+/* Inactivity timer value for transitions into U2 */
+#define PORT_U2_TIMEOUT(p)      (((p) & 0xff) << 8)
+/* Bits 24:31 for port testing */
+
+
+/**
+ * struct xhci_intr_reg - Interrupt Register Set
+ * @irq_pending:        IMAN - Interrupt Management Register.  Used to enable
+ *                      interrupts and check for pending interrupts.
+ * @irq_control:        IMOD - Interrupt Moderation Register.
+ *                      Used to throttle interrupts.
+ * @erst_size:          Number of segments in the Event Ring Segment Table (ERST).
+ * @erst_base:          ERST base address.
+ * @erst_dequeue:       Event ring dequeue pointer.
+ *
+ * Each interrupter (defined by a MSI-X vector) has an event ring and an Event
+ * Ring Segment Table (ERST) associated with it.  The event ring is comprised of
+ * multiple segments of the same size.  The HC places events on the ring and
+ * "updates the Cycle bit in the TRBs to indicate to software the current
+ * position of the Enqueue Pointer." The HCD (Linux) processes those events and
+ * updates the dequeue pointer.
+ */
+struct xhci_intr_reg {
+        u32     irq_pending;
+        u32     irq_control;
+        u32     erst_size;
+        u32     rsvd;
+        u32     erst_base[2];
+        u32     erst_dequeue[2];
+};
+
+/* irq_pending bitmasks */
+#define ER_IRQ_PENDING(p)       ((p) & 0x1)
+/* bits 2:31 need to be preserved */
+/* THIS IS BUGGY - FIXME - IP IS WRITE 1 TO CLEAR */
+#define ER_IRQ_CLEAR(p)         ((p) & 0xfffffffe)
+#define ER_IRQ_ENABLE(p)        ((ER_IRQ_CLEAR(p)) | 0x2)
+#define ER_IRQ_DISABLE(p)       ((ER_IRQ_CLEAR(p)) & ~(0x2))
+
+/* irq_control bitmasks */
+/* Minimum interval between interrupts (in 250ns intervals).  The interval
+ * between interrupts will be longer if there are no events on the event ring.
+ * Default is 4000 (1 ms).
+ */
+#define ER_IRQ_INTERVAL_MASK    (0xffff)
+/* Counter used to count down the time to the next interrupt - HW use only */
+#define ER_IRQ_COUNTER_MASK     (0xffff << 16)
+
+/* erst_size bitmasks */
+/* Preserve bits 16:31 of erst_size */
+#define ERST_SIZE_MASK          (0xffff << 16)
+
+/* erst_dequeue bitmasks */
+/* Dequeue ERST Segment Index (DESI) - Segment number (or alias)
+ * where the current dequeue pointer lies.  This is an optional HW hint.
+ */
+#define ERST_DESI_MASK          (0x7)
+/* Event Handler Busy (EHB) - is the event ring scheduled to be serviced by
+ * a work queue (or delayed service routine)?
+ */
+#define ERST_EHB                (1 << 3)
+#define ERST_PTR_MASK           (0xf)
+
+/**
+ * struct xhci_run_regs
+ * @microframe_index:
+ *              MFINDEX - current microframe number
+ *
+ * Section 5.5 Host Controller Runtime Registers:
+ * "Software should read and write these registers using only Dword (32 bit)
+ * or larger accesses"
+ */
+struct xhci_run_regs {
+        u32                     microframe_index;
+        u32                     rsvd[7];
+        struct xhci_intr_reg    ir_set[128];
+};
+
+/**
+ * struct doorbell_array
+ *
+ * Section 5.6
+ */
+struct xhci_doorbell_array {
+        u32     doorbell[256];
+};
+
+#define DB_TARGET_MASK          0xFFFFFF00
+#define DB_STREAM_ID_MASK       0x0000FFFF
+#define DB_TARGET_HOST          0x0
+#define DB_STREAM_ID_HOST       0x0
+#define DB_MASK                 (0xff << 8)
+
+/* Endpoint Target - bits 0:7 */
+#define EPI_TO_DB(p)            (((p) + 1) & 0xff)
+
+
+/**
+ * struct xhci_slot_ctx
+ * @dev_info:   Route string, device speed, hub info, and last valid endpoint
+ * @dev_info2:  Max exit latency for device number, root hub port number
+ * @tt_info:    tt_info is used to construct split transaction tokens
+ * @dev_state:  slot state and device address
+ *
+ * Slot Context - section 6.2.1.1.  This assumes the HC uses 32-byte context
+ * structures.  If the HC uses 64-byte contexts, there is an additional 32 bytes
+ * reserved at the end of the slot context for HC internal use.
+ */
+struct xhci_slot_ctx {
+        u32     dev_info;
+        u32     dev_info2;
+        u32     tt_info;
+        u32     dev_state;
+        /* offset 0x10 to 0x1f reserved for HC internal use */
+        u32     reserved[4];
+};
+
+/* dev_info bitmasks */
+/* Route String - 0:19 */
+#define ROUTE_STRING_MASK       (0xfffff)
+/* Device speed - values defined by PORTSC Device Speed field - 20:23 */
+#define DEV_SPEED       (0xf << 20)
+/* bit 24 reserved */
+/* Is this LS/FS device connected through a HS hub? - bit 25 */
+#define DEV_MTT         (0x1 << 25)
+/* Set if the device is a hub - bit 26 */
+#define DEV_HUB         (0x1 << 26)
+/* Index of the last valid endpoint context in this device context - 27:31 */
+#define LAST_CTX_MASK   (0x1f << 27)
+#define LAST_CTX(p)     ((p) << 27)
+#define LAST_CTX_TO_EP_NUM(p)   (((p) >> 27) - 1)
+#define SLOT_FLAG       (1 << 0)
+#define EP0_FLAG        (1 << 1)
+
+/* dev_info2 bitmasks */
+/* Max Exit Latency (ms) - worst case time to wake up all links in dev path */
+#define MAX_EXIT        (0xffff)
+/* Root hub port number that is needed to access the USB device */
+#define ROOT_HUB_PORT(p)        (((p) & 0xff) << 16)
+
+/* tt_info bitmasks */
+/*
+ * TT Hub Slot ID - for low or full speed devices attached to a high-speed hub
+ * The Slot ID of the hub that isolates the high speed signaling from
+ * this low or full-speed device.  '0' if attached to root hub port.
+ */
+#define TT_SLOT         (0xff)
+/*
+ * The number of the downstream facing port of the high-speed hub
+ * '0' if the device is not low or full speed.
+ */
+#define TT_PORT         (0xff << 8)
+
+/* dev_state bitmasks */
+/* USB device address - assigned by the HC */
+#define DEV_ADDR_MASK   (0xff)
+/* bits 8:26 reserved */
+/* Slot state */
+#define SLOT_STATE      (0x1f << 27)
+#define GET_SLOT_STATE(p)       (((p) & (0x1f << 27)) >> 27)
+
+
+/**
+ * struct xhci_ep_ctx
+ * @ep_info:    endpoint state, streams, mult, and interval information.
+ * @ep_info2:   information on endpoint type, max packet size, max burst size,
+ *              error count, and whether the HC will force an event for all
+ *              transactions.
+ * @deq:        64-bit ring dequeue pointer address.  If the endpoint only
+ *              defines one stream, this points to the endpoint transfer ring.
+ *              Otherwise, it points to a stream context array, which has a
+ *              ring pointer for each flow.
+ * @tx_info:
+ *              Average TRB lengths for the endpoint ring and
+ *              max payload within an Endpoint Service Interval Time (ESIT).
+ *
+ * Endpoint Context - section 6.2.1.2.  This assumes the HC uses 32-byte context
+ * structures.  If the HC uses 64-byte contexts, there is an additional 32 bytes
+ * reserved at the end of the endpoint context for HC internal use.
+ */
+struct xhci_ep_ctx {
+        u32     ep_info;
+        u32     ep_info2;
+        u32     deq[2];
+        u32     tx_info;
+        /* offset 0x14 - 0x1f reserved for HC internal use */
+        u32     reserved[3];
+};
+
+/* ep_info bitmasks */
+/*
+ * Endpoint State - bits 0:2
+ * 0 - disabled
+ * 1 - running
+ * 2 - halted due to halt condition - ok to manipulate endpoint ring
+ * 3 - stopped
+ * 4 - TRB error
+ * 5-7 - reserved
+ */
+#define EP_STATE_MASK           (0xf)
+#define EP_STATE_DISABLED       0
+#define EP_STATE_RUNNING        1
+#define EP_STATE_HALTED         2
+#define EP_STATE_STOPPED        3
+#define EP_STATE_ERROR          4
+/* Mult - Max number of burtst within an interval, in EP companion desc. */
+#define EP_MULT(p)              ((p & 0x3) << 8)
+/* bits 10:14 are Max Primary Streams */
+/* bit 15 is Linear Stream Array */
+/* Interval - period between requests to an endpoint - 125u increments. */
+#define EP_INTERVAL(p)          ((p & 0xff) << 16)
+
+/* ep_info2 bitmasks */
+/*
+ * Force Event - generate transfer events for all TRBs for this endpoint
+ * This will tell the HC to ignore the IOC and ISP flags (for debugging only).
+ */
+#define FORCE_EVENT     (0x1)
+#define ERROR_COUNT(p)  (((p) & 0x3) << 1)
+#define EP_TYPE(p)      ((p) << 3)
+#define ISOC_OUT_EP     1
+#define BULK_OUT_EP     2
+#define INT_OUT_EP      3
+#define CTRL_EP         4
+#define ISOC_IN_EP      5
+#define BULK_IN_EP      6
+#define INT_IN_EP       7
+/* bit 6 reserved */
+/* bit 7 is Host Initiate Disable - for disabling stream selection */
+#define MAX_BURST(p)    (((p)&0xff) << 8)
+#define MAX_PACKET(p)   (((p)&0xffff) << 16)
+
+
+/**
+ * struct xhci_device_control
+ * Input/Output context; see section 6.2.5.
+ *
+ * @drop_context:       set the bit of the endpoint context you want to disable
+ * @add_context:        set the bit of the endpoint context you want to enable
+ */
+struct xhci_device_control {
+        u32     drop_flags;
+        u32     add_flags;
+        u32     rsvd[6];
+        struct xhci_slot_ctx    slot;
+        struct xhci_ep_ctx      ep[31];
+};
+
+/* drop context bitmasks */
+#define DROP_EP(x)      (0x1 << x)
+/* add context bitmasks */
+#define ADD_EP(x)       (0x1 << x)
+
+
+struct xhci_virt_device {
+        /*
+         * Commands to the hardware are passed an "input context" that
+         * tells the hardware what to change in its data structures.
+         * The hardware will return changes in an "output context" that
+         * software must allocate for the hardware.  We need to keep
+         * track of input and output contexts separately because
+         * these commands might fail and we don't trust the hardware.
+         */
+        struct xhci_device_control      *out_ctx;
+        dma_addr_t                      out_ctx_dma;
+        /* Used for addressing devices and configuration changes */
+        struct xhci_device_control      *in_ctx;
+        dma_addr_t                      in_ctx_dma;
+        /* FIXME when stream support is added */
+        struct xhci_ring                *ep_rings[31];
+        /* Temporary storage in case the configure endpoint command fails and we
+         * have to restore the device state to the previous state
+         */
+        struct xhci_ring                *new_ep_rings[31];
+        struct completion               cmd_completion;
+        /* Status of the last command issued for this device */
+        u32                             cmd_status;
+};
+
+
+/**
+ * struct xhci_device_context_array
+ * @dev_context_ptr     array of 64-bit DMA addresses for device contexts
+ */
+struct xhci_device_context_array {
+        /* 64-bit device addresses; we only write 32-bit addresses */
+        u32                     dev_context_ptrs[2*MAX_HC_SLOTS];
+        /* private xHCD pointers */
+        dma_addr_t      dma;
+};
+/* TODO: write function to set the 64-bit device DMA address */
+/*
+ * TODO: change this to be dynamically sized at HC mem init time since the HC
+ * might not be able to handle the maximum number of devices possible.
+ */
+
+
+struct xhci_stream_ctx {
+        /* 64-bit stream ring address, cycle state, and stream type */
+        u32     stream_ring[2];
+        /* offset 0x14 - 0x1f reserved for HC internal use */
+        u32     reserved[2];
+};
+
+
+struct xhci_transfer_event {
+        /* 64-bit buffer address, or immediate data */
+        u32     buffer[2];
+        u32     transfer_len;
+        /* This field is interpreted differently based on the type of TRB */
+        u32     flags;
+};
+
+/** Transfer Event bit fields **/
+#define TRB_TO_EP_ID(p) (((p) >> 16) & 0x1f)
+
+/* Completion Code - only applicable for some types of TRBs */
+#define COMP_CODE_MASK          (0xff << 24)
+#define GET_COMP_CODE(p)        (((p) & COMP_CODE_MASK) >> 24)
+#define COMP_SUCCESS    1
+/* Data Buffer Error */
+#define COMP_DB_ERR     2
+/* Babble Detected Error */
+#define COMP_BABBLE     3
+/* USB Transaction Error */
+#define COMP_TX_ERR     4
+/* TRB Error - some TRB field is invalid */
+#define COMP_TRB_ERR    5
+/* Stall Error - USB device is stalled */
+#define COMP_STALL      6
+/* Resource Error - HC doesn't have memory for that device configuration */
+#define COMP_ENOMEM     7
+/* Bandwidth Error - not enough room in schedule for this dev config */
+#define COMP_BW_ERR     8
+/* No Slots Available Error - HC ran out of device slots */
+#define COMP_ENOSLOTS   9
+/* Invalid Stream Type Error */
+#define COMP_STREAM_ERR 10
+/* Slot Not Enabled Error - doorbell rung for disabled device slot */
+#define COMP_EBADSLT    11
+/* Endpoint Not Enabled Error */
+#define COMP_EBADEP     12
+/* Short Packet */
+#define COMP_SHORT_TX   13
+/* Ring Underrun - doorbell rung for an empty isoc OUT ep ring */
+#define COMP_UNDERRUN   14
+/* Ring Overrun - isoc IN ep ring is empty when ep is scheduled to RX */
+#define COMP_OVERRUN    15
+/* Virtual Function Event Ring Full Error */
+#define COMP_VF_FULL    16
+/* Parameter Error - Context parameter is invalid */
+#define COMP_EINVAL     17
+/* Bandwidth Overrun Error - isoc ep exceeded its allocated bandwidth */
+#define COMP_BW_OVER    18
+/* Context State Error - illegal context state transition requested */
+#define COMP_CTX_STATE  19
+/* No Ping Response Error - HC didn't get PING_RESPONSE in time to TX */
+#define COMP_PING_ERR   20
+/* Event Ring is full */
+#define COMP_ER_FULL    21
+/* Missed Service Error - HC couldn't service an isoc ep within interval */
+#define COMP_MISSED_INT 23
+/* Successfully stopped command ring */
+#define COMP_CMD_STOP   24
+/* Successfully aborted current command and stopped command ring */
+#define COMP_CMD_ABORT  25
+/* Stopped - transfer was terminated by a stop endpoint command */
+#define COMP_STOP       26
+/* Same as COMP_EP_STOPPED, but the transfered length in the event is invalid */
+#define COMP_STOP_INVAL 27
+/* Control Abort Error - Debug Capability - control pipe aborted */
+#define COMP_DBG_ABORT  28
+/* TRB type 29 and 30 reserved */
+/* Isoc Buffer Overrun - an isoc IN ep sent more data than could fit in TD */
+#define COMP_BUFF_OVER  31
+/* Event Lost Error - xHC has an "internal event overrun condition" */
+#define COMP_ISSUES     32
+/* Undefined Error - reported when other error codes don't apply */
+#define COMP_UNKNOWN    33
+/* Invalid Stream ID Error */
+#define COMP_STRID_ERR  34
+/* Secondary Bandwidth Error - may be returned by a Configure Endpoint cmd */
+/* FIXME - check for this */
+#define COMP_2ND_BW_ERR 35
+/* Split Transaction Error */
+#define COMP_SPLIT_ERR  36
+
+struct xhci_link_trb {
+        /* 64-bit segment pointer*/
+        u32 segment_ptr[2];
+        u32 intr_target;
+        u32 control;
+};
+
+/* control bitfields */
+#define LINK_TOGGLE     (0x1<<1)
+
+/* Command completion event TRB */
+struct xhci_event_cmd {
+        /* Pointer to command TRB, or the value passed by the event data trb */
+        u32 cmd_trb[2];
+        u32 status;
+        u32 flags;
+};
+
+/* flags bitmasks */
+/* bits 16:23 are the virtual function ID */
+/* bits 24:31 are the slot ID */
+#define TRB_TO_SLOT_ID(p)       (((p) & (0xff<<24)) >> 24)
+#define SLOT_ID_FOR_TRB(p)      (((p) & 0xff) << 24)
+
+/* Stop Endpoint TRB - ep_index to endpoint ID for this TRB */
+#define TRB_TO_EP_INDEX(p)              ((((p) & (0x1f << 16)) >> 16) - 1)
+#define EP_ID_FOR_TRB(p)                ((((p) + 1) & 0x1f) << 16)
+
+
+/* Port Status Change Event TRB fields */
+/* Port ID - bits 31:24 */
+#define GET_PORT_ID(p)          (((p) & (0xff << 24)) >> 24)
+
+/* Normal TRB fields */
+/* transfer_len bitmasks - bits 0:16 */
+#define TRB_LEN(p)              ((p) & 0x1ffff)
+/* TD size - number of bytes remaining in the TD (including this TRB):
+ * bits 17 - 21.  Shift the number of bytes by 10. */
+#define TD_REMAINDER(p)         ((((p) >> 10) & 0x1f) << 17)
+/* Interrupter Target - which MSI-X vector to target the completion event at */
+#define TRB_INTR_TARGET(p)      (((p) & 0x3ff) << 22)
+#define GET_INTR_TARGET(p)      (((p) >> 22) & 0x3ff)
+
+/* Cycle bit - indicates TRB ownership by HC or HCD */
+#define TRB_CYCLE               (1<<0)
+/*
+ * Force next event data TRB to be evaluated before task switch.
+ * Used to pass OS data back after a TD completes.
+ */
+#define TRB_ENT                 (1<<1)
+/* Interrupt on short packet */
+#define TRB_ISP                 (1<<2)
+/* Set PCIe no snoop attribute */
+#define TRB_NO_SNOOP            (1<<3)
+/* Chain multiple TRBs into a TD */
+#define TRB_CHAIN               (1<<4)
+/* Interrupt on completion */
+#define TRB_IOC                 (1<<5)
+/* The buffer pointer contains immediate data */
+#define TRB_IDT                 (1<<6)
+
+
+/* Control transfer TRB specific fields */
+#define TRB_DIR_IN              (1<<16)
+
+struct xhci_generic_trb {
+        u32 field[4];
+};
+
+union xhci_trb {
+        struct xhci_link_trb            link;
+        struct xhci_transfer_event      trans_event;
+        struct xhci_event_cmd           event_cmd;
+        struct xhci_generic_trb         generic;
+};
+
+/* TRB bit mask */
+#define TRB_TYPE_BITMASK        (0xfc00)
+#define TRB_TYPE(p)             ((p) << 10)
+/* TRB type IDs */
+/* bulk, interrupt, isoc scatter/gather, and control data stage */
+#define TRB_NORMAL              1
+/* setup stage for control transfers */
+#define TRB_SETUP               2
+/* data stage for control transfers */
+#define TRB_DATA                3
+/* status stage for control transfers */
+#define TRB_STATUS              4
+/* isoc transfers */
+#define TRB_ISOC                5
+/* TRB for linking ring segments */
+#define TRB_LINK                6
+#define TRB_EVENT_DATA          7
+/* Transfer Ring No-op (not for the command ring) */
+#define TRB_TR_NOOP             8
+/* Command TRBs */
+/* Enable Slot Command */
+#define TRB_ENABLE_SLOT         9
+/* Disable Slot Command */
+#define TRB_DISABLE_SLOT        10
+/* Address Device Command */
+#define TRB_ADDR_DEV            11
+/* Configure Endpoint Command */
+#define TRB_CONFIG_EP           12
+/* Evaluate Context Command */
+#define TRB_EVAL_CONTEXT        13
+/* Reset Transfer Ring Command */
+#define TRB_RESET_RING          14
+/* Stop Transfer Ring Command */
+#define TRB_STOP_RING           15
+/* Set Transfer Ring Dequeue Pointer Command */
+#define TRB_SET_DEQ             16
+/* Reset Device Command */
+#define TRB_RESET_DEV           17
+/* Force Event Command (opt) */
+#define TRB_FORCE_EVENT         18
+/* Negotiate Bandwidth Command (opt) */
+#define TRB_NEG_BANDWIDTH       19
+/* Set Latency Tolerance Value Command (opt) */
+#define TRB_SET_LT              20
+/* Get port bandwidth Command */
+#define TRB_GET_BW              21
+/* Force Header Command - generate a transaction or link management packet */
+#define TRB_FORCE_HEADER        22
+/* No-op Command - not for transfer rings */
+#define TRB_CMD_NOOP            23
+/* TRB IDs 24-31 reserved */
+/* Event TRBS */
+/* Transfer Event */
+#define TRB_TRANSFER            32
+/* Command Completion Event */
+#define TRB_COMPLETION          33
+/* Port Status Change Event */
+#define TRB_PORT_STATUS         34
+/* Bandwidth Request Event (opt) */
+#define TRB_BANDWIDTH_EVENT     35
+/* Doorbell Event (opt) */
+#define TRB_DOORBELL            36
+/* Host Controller Event */
+#define TRB_HC_EVENT            37
+/* Device Notification Event - device sent function wake notification */
+#define TRB_DEV_NOTE            38
+/* MFINDEX Wrap Event - microframe counter wrapped */
+#define TRB_MFINDEX_WRAP        39
+/* TRB IDs 40-47 reserved, 48-63 is vendor-defined */
+
+/*
+ * TRBS_PER_SEGMENT must be a multiple of 4,
+ * since the command ring is 64-byte aligned.
+ * It must also be greater than 16.
+ */
+#define TRBS_PER_SEGMENT        64
+#define SEGMENT_SIZE            (TRBS_PER_SEGMENT*16)
+/* TRB buffer pointers can't cross 64KB boundaries */
+#define TRB_MAX_BUFF_SHIFT              16
+#define TRB_MAX_BUFF_SIZE       (1 << TRB_MAX_BUFF_SHIFT)
+
+struct xhci_segment {
+        union xhci_trb          *trbs;
+        /* private to HCD */
+        struct xhci_segment     *next;
+        dma_addr_t              dma;
+};
+
+struct xhci_td {
+        struct list_head        td_list;
+        struct list_head        cancelled_td_list;
+        struct urb              *urb;
+        struct xhci_segment     *start_seg;
+        union xhci_trb          *first_trb;
+        union xhci_trb          *last_trb;
+};
+
+struct xhci_ring {
+        struct xhci_segment     *first_seg;
+        union  xhci_trb         *enqueue;
+        struct xhci_segment     *enq_seg;
+        unsigned int            enq_updates;
+        union  xhci_trb         *dequeue;
+        struct xhci_segment     *deq_seg;
+        unsigned int            deq_updates;
+        struct list_head        td_list;
+        /* ----  Related to URB cancellation ---- */
+        struct list_head        cancelled_td_list;
+        unsigned int            cancels_pending;
+        unsigned int            state;
+#define SET_DEQ_PENDING         (1 << 0)
+        /* The TRB that was last reported in a stopped endpoint ring */
+        union xhci_trb          *stopped_trb;
+        struct xhci_td          *stopped_td;
+        /*
+         * Write the cycle state into the TRB cycle field to give ownership of
+         * the TRB to the host controller (if we are the producer), or to check
+         * if we own the TRB (if we are the consumer).  See section 4.9.1.
+         */
+        u32                     cycle_state;
+};
+
+struct xhci_erst_entry {
+        /* 64-bit event ring segment address */
+        u32     seg_addr[2];
+        u32     seg_size;
+        /* Set to zero */
+        u32     rsvd;
+};
+
+struct xhci_erst {
+        struct xhci_erst_entry  *entries;
+        unsigned int            num_entries;
+        /* xhci->event_ring keeps track of segment dma addresses */
+        dma_addr_t              erst_dma_addr;
+        /* Num entries the ERST can contain */
+        unsigned int            erst_size;
+};
+
+/*
+ * Each segment table entry is 4*32bits long.  1K seems like an ok size:
+ * (1K bytes * 8bytes/bit) / (4*32 bits) = 64 segment entries in the table,
+ * meaning 64 ring segments.
+ * Initial allocated size of the ERST, in number of entries */
+#define ERST_NUM_SEGS   1
+/* Initial allocated size of the ERST, in number of entries */
+#define ERST_SIZE       64
+/* Initial number of event segment rings allocated */
+#define ERST_ENTRIES    1
+/* Poll every 60 seconds */
+#define POLL_TIMEOUT    60
+/* XXX: Make these module parameters */
+
+
+/* There is one ehci_hci structure per controller */
+struct xhci_hcd {
+        /* glue to PCI and HCD framework */
+        struct xhci_cap_regs __iomem *cap_regs;
+        struct xhci_op_regs __iomem *op_regs;
+        struct xhci_run_regs __iomem *run_regs;
+        struct xhci_doorbell_array __iomem *dba;
+        /* Our HCD's current interrupter register set */
+        struct  xhci_intr_reg __iomem *ir_set;
+
+        /* Cached register copies of read-only HC data */
+        __u32           hcs_params1;
+        __u32           hcs_params2;
+        __u32           hcs_params3;
+        __u32           hcc_params;
+
+        spinlock_t      lock;
+
+        /* packed release number */
+        u8              sbrn;
+        u16             hci_version;
+        u8              max_slots;
+        u8              max_interrupters;
+        u8              max_ports;
+        u8              isoc_threshold;
+        int             event_ring_max;
+        int             addr_64;
+        /* 4KB min, 128MB max */
+        int             page_size;
+        /* Valid values are 12 to 20, inclusive */
+        int             page_shift;
+        /* only one MSI vector for now, but might need more later */
+        int             msix_count;
+        struct msix_entry       *msix_entries;
+        /* data structures */
+        struct xhci_device_context_array *dcbaa;
+        struct xhci_ring        *cmd_ring;
+        struct xhci_ring        *event_ring;
+        struct xhci_erst        erst;
+        /* slot enabling and address device helpers */
+        struct completion       addr_dev;
+        int slot_id;
+        /* Internal mirror of the HW's dcbaa */
+        struct xhci_virt_device *devs[MAX_HC_SLOTS];
+
+        /* DMA pools */
+        struct dma_pool *device_pool;
+        struct dma_pool *segment_pool;
+
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+        /* Poll the rings - for debugging */
+        struct timer_list       event_ring_timer;
+        int                     zombie;
+#endif
+        /* Statistics */
+        int                     noops_submitted;
+        int                     noops_handled;
+        int                     error_bitmask;
+};
+
+/* For testing purposes */
+#define NUM_TEST_NOOPS  0
+
+/* convert between an HCD pointer and the corresponding EHCI_HCD */
+static inline struct xhci_hcd *hcd_to_xhci(struct usb_hcd *hcd)
+{
+        return (struct xhci_hcd *) (hcd->hcd_priv);
+}
+
+static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci)
+{
+        return container_of((void *) xhci, struct usb_hcd, hcd_priv);
+}
+
+#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
+#define XHCI_DEBUG      1
+#else
+#define XHCI_DEBUG      0
+#endif
+
+#define xhci_dbg(xhci, fmt, args...) \
+        do { if (XHCI_DEBUG) dev_dbg(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
+#define xhci_info(xhci, fmt, args...) \
+        do { if (XHCI_DEBUG) dev_info(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
+#define xhci_err(xhci, fmt, args...) \
+        dev_err(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
+#define xhci_warn(xhci, fmt, args...) \
+        dev_warn(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
+
+/* TODO: copied from ehci.h - can be refactored? */
+/* xHCI spec says all registers are little endian */
+static inline unsigned int xhci_readl(const struct xhci_hcd *xhci,
+                __u32 __iomem *regs)
+{
+        return readl(regs);
+}
+static inline void xhci_writel(struct xhci_hcd *xhci,
+                const unsigned int val, __u32 __iomem *regs)
+{
+        if (!in_interrupt())
+                xhci_dbg(xhci,
+                         "`MEM_WRITE_DWORD(3'b000, 32'h%p, 32'h%0x, 4'hf);\n",
+                         regs, val);
+        writel(val, regs);
+}
+
+/* xHCI debugging */
+void xhci_print_ir_set(struct xhci_hcd *xhci, struct xhci_intr_reg *ir_set, int set_num);
+void xhci_print_registers(struct xhci_hcd *xhci);
+void xhci_dbg_regs(struct xhci_hcd *xhci);
+void xhci_print_run_regs(struct xhci_hcd *xhci);
+void xhci_print_trb_offsets(struct xhci_hcd *xhci, union xhci_trb *trb);
+void xhci_debug_trb(struct xhci_hcd *xhci, union xhci_trb *trb);
+void xhci_debug_segment(struct xhci_hcd *xhci, struct xhci_segment *seg);
+void xhci_debug_ring(struct xhci_hcd *xhci, struct xhci_ring *ring);
+void xhci_dbg_erst(struct xhci_hcd *xhci, struct xhci_erst *erst);
+void xhci_dbg_cmd_ptrs(struct xhci_hcd *xhci);
+void xhci_dbg_ring_ptrs(struct xhci_hcd *xhci, struct xhci_ring *ring);
+void xhci_dbg_ctx(struct xhci_hcd *xhci, struct xhci_device_control *ctx, dma_addr_t dma, unsigned int last_ep);
+
+/* xHCI memory managment */
+void xhci_mem_cleanup(struct xhci_hcd *xhci);
+int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags);
+void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id);
+int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id, struct usb_device *udev, gfp_t flags);
+int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *udev);
+unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc);
+unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc);
+void xhci_endpoint_zero(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev, struct usb_host_endpoint *ep);
+int xhci_endpoint_init(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev,
+                struct usb_device *udev, struct usb_host_endpoint *ep,
+                gfp_t mem_flags);
+void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring);
+
+#ifdef CONFIG_PCI
+/* xHCI PCI glue */
+int xhci_register_pci(void);
+void xhci_unregister_pci(void);
+#endif
+
+/* xHCI host controller glue */
+int xhci_halt(struct xhci_hcd *xhci);
+int xhci_reset(struct xhci_hcd *xhci);
+int xhci_init(struct usb_hcd *hcd);
+int xhci_run(struct usb_hcd *hcd);
+void xhci_stop(struct usb_hcd *hcd);
+void xhci_shutdown(struct usb_hcd *hcd);
+int xhci_get_frame(struct usb_hcd *hcd);
+irqreturn_t xhci_irq(struct usb_hcd *hcd);
+int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev);
+void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev);
+int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev);
+int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags);
+int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
+int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev, struct usb_host_endpoint *ep);
+int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev, struct usb_host_endpoint *ep);
+int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
+void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
+
+/* xHCI ring, segment, TRB, and TD functions */
+dma_addr_t xhci_trb_virt_to_dma(struct xhci_segment *seg, union xhci_trb *trb);
+void xhci_ring_cmd_db(struct xhci_hcd *xhci);
+void *xhci_setup_one_noop(struct xhci_hcd *xhci);
+void xhci_handle_event(struct xhci_hcd *xhci);
+void xhci_set_hc_event_deq(struct xhci_hcd *xhci);
+int xhci_queue_slot_control(struct xhci_hcd *xhci, u32 trb_type, u32 slot_id);
+int xhci_queue_address_device(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
+                u32 slot_id);
+int xhci_queue_stop_endpoint(struct xhci_hcd *xhci, int slot_id,
+                unsigned int ep_index);
+int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,
+                int slot_id, unsigned int ep_index);
+int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb,
+                int slot_id, unsigned int ep_index);
+int xhci_queue_configure_endpoint(struct xhci_hcd *xhci, dma_addr_t in_ctx_ptr,
+                u32 slot_id);
+
+/* xHCI roothub code */
+int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex,
+                char *buf, u16 wLength);
+int xhci_hub_status_data(struct usb_hcd *hcd, char *buf);
+
+#endif /* __LINUX_XHCI_HCD_H */
diff --git a/drivers/usb/misc/sisusbvga/Kconfig b/drivers/usb/misc/sisusbvga/Kconfig
index 7603cbe0865d..30ea7ca6846e 100644
--- a/drivers/usb/misc/sisusbvga/Kconfig
+++ b/drivers/usb/misc/sisusbvga/Kconfig
@@ -1,7 +1,7 @@
 
 config USB_SISUSBVGA
         tristate "USB 2.0 SVGA dongle support (Net2280/SiS315)"
-        depends on USB && USB_EHCI_HCD
+        depends on USB && (USB_MUSB_HDRC || USB_EHCI_HCD)
         ---help---
           Say Y here if you intend to attach a USB2VGA dongle based on a
           Net2280 and a SiS315 chip.
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 5f1a19d1497d..a9f06d76960f 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -1072,23 +1072,34 @@ static int unlink1 (struct usbtest_dev *dev, int pipe, int size, int async)
          */
         msleep (jiffies % (2 * INTERRUPT_RATE));
         if (async) {
-retry:
-                retval = usb_unlink_urb (urb);
-                if (retval == -EBUSY || retval == -EIDRM) {
-                        /* we can't unlink urbs while they're completing.
-                         * or if they've completed, and we haven't resubmitted.
-                         * "normal" drivers would prevent resubmission, but
-                         * since we're testing unlink paths, we can't.
-                         */
-                        ERROR(dev,  "unlink retry\n");
-                        goto retry;
+                while (!completion_done(&completion)) {
+                        retval = usb_unlink_urb(urb);
+
+                        switch (retval) {
+                        case -EBUSY:
+                        case -EIDRM:
+                                /* we can't unlink urbs while they're completing
+                                 * or if they've completed, and we haven't
+                                 * resubmitted. "normal" drivers would prevent
+                                 * resubmission, but since we're testing unlink
+                                 * paths, we can't.
+                                 */
+                                ERROR(dev, "unlink retry\n");
+                                continue;
+                        case 0:
+                        case -EINPROGRESS:
+                                break;
+
+                        default:
+                                dev_err(&dev->intf->dev,
+                                        "unlink fail %d\n", retval);
+                                return retval;
+                        }
+
+                        break;
                 }
         } else
                 usb_kill_urb (urb);
-        if (!(retval == 0 || retval == -EINPROGRESS)) {
-                dev_err(&dev->intf->dev, "unlink fail %d\n", retval);
-                return retval;
-        }
 
         wait_for_completion (&completion);
         retval = urb->status;
diff --git a/drivers/usb/mon/mon_text.c b/drivers/usb/mon/mon_text.c
index 1f715436d6d3..a7eb4c99342c 100644
--- a/drivers/usb/mon/mon_text.c
+++ b/drivers/usb/mon/mon_text.c
@@ -733,7 +733,7 @@ int __init mon_text_init(void)
 {
         struct dentry *mondir;
 
-        mondir = debugfs_create_dir("usbmon", NULL);
+        mondir = debugfs_create_dir("usbmon", usb_debug_root);
         if (IS_ERR(mondir)) {
                 printk(KERN_NOTICE TAG ": debugfs is not available\n");
                 return -ENODEV;
diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
index b66e8544d8b9..70073b157f0a 100644
--- a/drivers/usb/musb/Kconfig
+++ b/drivers/usb/musb/Kconfig
@@ -10,6 +10,7 @@ comment "Enable Host or Gadget support to see Inventra options"
 config USB_MUSB_HDRC
         depends on (USB || USB_GADGET) && HAVE_CLK
         depends on !SUPERH
+        select NOP_USB_XCEIV if ARCH_DAVINCI
         select TWL4030_USB if MACH_OMAP_3430SDP
         select USB_OTG_UTILS
         tristate 'Inventra Highspeed Dual Role Controller (TI, ADI, ...)'
@@ -55,6 +56,7 @@ comment "Blackfin high speed USB Support"
 config USB_TUSB6010
         boolean "TUSB 6010 support"
         depends on USB_MUSB_HDRC && !USB_MUSB_SOC
+        select NOP_USB_XCEIV
         default y
         help
           The TUSB 6010 chip, from Texas Instruments, connects a discrete
diff --git a/drivers/usb/musb/blackfin.c b/drivers/usb/musb/blackfin.c
index 786134852092..f2f66ebc7362 100644
--- a/drivers/usb/musb/blackfin.c
+++ b/drivers/usb/musb/blackfin.c
@@ -143,7 +143,7 @@ static void musb_conn_timer_handler(unsigned long _musb)
         u16 val;
 
         spin_lock_irqsave(&musb->lock, flags);
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         case OTG_STATE_A_IDLE:
         case OTG_STATE_A_WAIT_BCON:
                 /* Start a new session */
@@ -154,7 +154,7 @@ static void musb_conn_timer_handler(unsigned long _musb)
                 val = musb_readw(musb->mregs, MUSB_DEVCTL);
                 if (!(val & MUSB_DEVCTL_BDEVICE)) {
                         gpio_set_value(musb->config->gpio_vrsel, 1);
-                        musb->xceiv.state = OTG_STATE_A_WAIT_BCON;
+                        musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
                 } else {
                         gpio_set_value(musb->config->gpio_vrsel, 0);
 
@@ -247,6 +247,11 @@ int __init musb_platform_init(struct musb *musb)
         }
         gpio_direction_output(musb->config->gpio_vrsel, 0);
 
+        usb_nop_xceiv_register();
+        musb->xceiv = otg_get_transceiver();
+        if (!musb->xceiv)
+                return -ENODEV;
+
         if (ANOMALY_05000346) {
                 bfin_write_USB_APHY_CALIB(ANOMALY_05000346_value);
                 SSYNC();
@@ -291,7 +296,7 @@ int __init musb_platform_init(struct musb *musb)
                         musb_conn_timer_handler, (unsigned long) musb);
         }
         if (is_peripheral_enabled(musb))
-                musb->xceiv.set_power = bfin_set_power;
+                musb->xceiv->set_power = bfin_set_power;
 
         musb->isr = blackfin_interrupt;
 
diff --git a/drivers/usb/musb/cppi_dma.c b/drivers/usb/musb/cppi_dma.c
index 1976e9b41800..c3577bbbae6c 100644
--- a/drivers/usb/musb/cppi_dma.c
+++ b/drivers/usb/musb/cppi_dma.c
@@ -6,6 +6,7 @@
  * The TUSB6020, using VLYNQ, has CPPI that looks much like DaVinci.
  */
 
+#include <linux/platform_device.h>
 #include <linux/usb.h>
 
 #include "musb_core.h"
@@ -1145,17 +1146,27 @@ static bool cppi_rx_scan(struct cppi *cppi, unsigned ch)
         return completed;
 }
 
-void cppi_completion(struct musb *musb, u32 rx, u32 tx)
+irqreturn_t cppi_interrupt(int irq, void *dev_id)
 {
-        void __iomem            *tibase;
-        int                     i, index;
+        struct musb             *musb = dev_id;
         struct cppi             *cppi;
+        void __iomem            *tibase;
         struct musb_hw_ep       *hw_ep = NULL;
+        u32                     rx, tx;
+        int                     i, index;
 
         cppi = container_of(musb->dma_controller, struct cppi, controller);
 
         tibase = musb->ctrl_base;
 
+        tx = musb_readl(tibase, DAVINCI_TXCPPI_MASKED_REG);
+        rx = musb_readl(tibase, DAVINCI_RXCPPI_MASKED_REG);
+
+        if (!tx && !rx)
+                return IRQ_NONE;
+
+        DBG(4, "CPPI IRQ Tx%x Rx%x\n", tx, rx);
+
         /* process TX channels */
         for (index = 0; tx; tx = tx >> 1, index++) {
                 struct cppi_channel             *tx_ch;
@@ -1273,6 +1284,8 @@ void cppi_completion(struct musb *musb, u32 rx, u32 tx)
 
         /* write to CPPI EOI register to re-enable interrupts */
         musb_writel(tibase, DAVINCI_CPPI_EOI_REG, 0);
+
+        return IRQ_HANDLED;
 }
 
 /* Instantiate a software object representing a DMA controller. */
@@ -1280,6 +1293,9 @@ struct dma_controller *__init
 dma_controller_create(struct musb *musb, void __iomem *mregs)
 {
         struct cppi             *controller;
+        struct device           *dev = musb->controller;
+        struct platform_device  *pdev = to_platform_device(dev);
+        int                     irq = platform_get_irq(pdev, 1);
 
         controller = kzalloc(sizeof *controller, GFP_KERNEL);
         if (!controller)
@@ -1310,6 +1326,15 @@ dma_controller_create(struct musb *musb, void __iomem *mregs)
                 return NULL;
         }
 
+        if (irq > 0) {
+                if (request_irq(irq, cppi_interrupt, 0, "cppi-dma", musb)) {
+                        dev_err(dev, "request_irq %d failed!\n", irq);
+                        dma_controller_destroy(&controller->controller);
+                        return NULL;
+                }
+                controller->irq = irq;
+        }
+
         return &controller->controller;
 }
 
@@ -1322,6 +1347,9 @@ void dma_controller_destroy(struct dma_controller *c)
 
         cppi = container_of(c, struct cppi, controller);
 
+        if (cppi->irq)
+                free_irq(cppi->irq, cppi->musb);
+
         /* assert:  caller stopped the controller first */
         dma_pool_destroy(cppi->pool);
 
diff --git a/drivers/usb/musb/cppi_dma.h b/drivers/usb/musb/cppi_dma.h
index 729b4071787b..8a39de3e6e47 100644
--- a/drivers/usb/musb/cppi_dma.h
+++ b/drivers/usb/musb/cppi_dma.h
@@ -119,6 +119,8 @@ struct cppi {
         void __iomem                    *mregs;         /* Mentor regs */
         void __iomem                    *tibase;        /* TI/CPPI regs */
 
+        int                             irq;
+
         struct cppi_channel             tx[4];
         struct cppi_channel             rx[4];
 
@@ -127,7 +129,7 @@ struct cppi {
         struct list_head                tx_complete;
 };
 
-/* irq handling hook */
-extern void cppi_completion(struct musb *, u32 rx, u32 tx);
+/* CPPI IRQ handler */
+extern irqreturn_t cppi_interrupt(int, void *);
 
 #endif                          /* end of ifndef _CPPI_DMA_H_ */
diff --git a/drivers/usb/musb/davinci.c b/drivers/usb/musb/davinci.c
index 10d11ab113ab..180d7daa4099 100644
--- a/drivers/usb/musb/davinci.c
+++ b/drivers/usb/musb/davinci.c
@@ -215,7 +215,7 @@ static void otg_timer(unsigned long _musb)
         DBG(7, "poll devctl %02x (%s)\n", devctl, otg_state_string(musb));
 
         spin_lock_irqsave(&musb->lock, flags);
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         case OTG_STATE_A_WAIT_VFALL:
                 /* Wait till VBUS falls below SessionEnd (~0.2V); the 1.3 RTL
                  * seems to mis-handle session "start" otherwise (or in our
@@ -226,7 +226,7 @@ static void otg_timer(unsigned long _musb)
                         mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
                         break;
                 }
-                musb->xceiv.state = OTG_STATE_A_WAIT_VRISE;
+                musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
                 musb_writel(musb->ctrl_base, DAVINCI_USB_INT_SET_REG,
                         MUSB_INTR_VBUSERROR << DAVINCI_USB_USBINT_SHIFT);
                 break;
@@ -251,7 +251,7 @@ static void otg_timer(unsigned long _musb)
                 if (devctl & MUSB_DEVCTL_BDEVICE)
                         mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
                 else
-                        musb->xceiv.state = OTG_STATE_A_IDLE;
+                        musb->xceiv->state = OTG_STATE_A_IDLE;
                 break;
         default:
                 break;
@@ -265,6 +265,7 @@ static irqreturn_t davinci_interrupt(int irq, void *__hci)
         irqreturn_t     retval = IRQ_NONE;
         struct musb     *musb = __hci;
         void __iomem    *tibase = musb->ctrl_base;
+        struct cppi     *cppi;
         u32             tmp;
 
         spin_lock_irqsave(&musb->lock, flags);
@@ -281,16 +282,9 @@ static irqreturn_t davinci_interrupt(int irq, void *__hci)
         /* CPPI interrupts share the same IRQ line, but have their own
          * mask, state, "vector", and EOI registers.
          */
-        if (is_cppi_enabled()) {
-                u32 cppi_tx = musb_readl(tibase, DAVINCI_TXCPPI_MASKED_REG);
-                u32 cppi_rx = musb_readl(tibase, DAVINCI_RXCPPI_MASKED_REG);
-
-                if (cppi_tx || cppi_rx) {
-                        DBG(4, "CPPI IRQ t%x r%x\n", cppi_tx, cppi_rx);
-                        cppi_completion(musb, cppi_rx, cppi_tx);
-                        retval = IRQ_HANDLED;
-                }
-        }
+        cppi = container_of(musb->dma_controller, struct cppi, controller);
+        if (is_cppi_enabled() && musb->dma_controller && !cppi->irq)
+                retval = cppi_interrupt(irq, __hci);
 
         /* ack and handle non-CPPI interrupts */
         tmp = musb_readl(tibase, DAVINCI_USB_INT_SRC_MASKED_REG);
@@ -331,21 +325,21 @@ static irqreturn_t davinci_interrupt(int irq, void *__hci)
                          * to stop registering in devctl.
                          */
                         musb->int_usb &= ~MUSB_INTR_VBUSERROR;
-                        musb->xceiv.state = OTG_STATE_A_WAIT_VFALL;
+                        musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
                         mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
                         WARNING("VBUS error workaround (delay coming)\n");
                 } else if (is_host_enabled(musb) && drvvbus) {
                         musb->is_active = 1;
                         MUSB_HST_MODE(musb);
-                        musb->xceiv.default_a = 1;
-                        musb->xceiv.state = OTG_STATE_A_WAIT_VRISE;
+                        musb->xceiv->default_a = 1;
+                        musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
                         portstate(musb->port1_status |= USB_PORT_STAT_POWER);
                         del_timer(&otg_workaround);
                 } else {
                         musb->is_active = 0;
                         MUSB_DEV_MODE(musb);
-                        musb->xceiv.default_a = 0;
-                        musb->xceiv.state = OTG_STATE_B_IDLE;
+                        musb->xceiv->default_a = 0;
+                        musb->xceiv->state = OTG_STATE_B_IDLE;
                         portstate(musb->port1_status &= ~USB_PORT_STAT_POWER);
                 }
 
@@ -367,17 +361,12 @@ static irqreturn_t davinci_interrupt(int irq, void *__hci)
 
         /* poll for ID change */
         if (is_otg_enabled(musb)
-                        && musb->xceiv.state == OTG_STATE_B_IDLE)
+                        && musb->xceiv->state == OTG_STATE_B_IDLE)
                 mod_timer(&otg_workaround, jiffies + POLL_SECONDS * HZ);
 
         spin_unlock_irqrestore(&musb->lock, flags);
 
-        /* REVISIT we sometimes get unhandled IRQs
-         * (e.g. ep0).  not clear why...
-         */
-        if (retval != IRQ_HANDLED)
-                DBG(5, "unhandled? %08x\n", tmp);
-        return IRQ_HANDLED;
+        return retval;
 }
 
 int musb_platform_set_mode(struct musb *musb, u8 mode)
@@ -391,6 +380,11 @@ int __init musb_platform_init(struct musb *musb)
         void __iomem    *tibase = musb->ctrl_base;
         u32             revision;
 
+        usb_nop_xceiv_register();
+        musb->xceiv = otg_get_transceiver();
+        if (!musb->xceiv)
+                return -ENODEV;
+
         musb->mregs += DAVINCI_BASE_OFFSET;
 
         clk_enable(musb->clock);
@@ -398,7 +392,7 @@ int __init musb_platform_init(struct musb *musb)
         /* returns zero if e.g. not clocked */
         revision = musb_readl(tibase, DAVINCI_USB_VERSION_REG);
         if (revision == 0)
-                return -ENODEV;
+                goto fail;
 
         if (is_host_enabled(musb))
                 setup_timer(&otg_workaround, otg_timer, (unsigned long) musb);
@@ -432,6 +426,10 @@ int __init musb_platform_init(struct musb *musb)
 
         musb->isr = davinci_interrupt;
         return 0;
+
+fail:
+        usb_nop_xceiv_unregister();
+        return -ENODEV;
 }
 
 int musb_platform_exit(struct musb *musb)
@@ -442,7 +440,7 @@ int musb_platform_exit(struct musb *musb)
         davinci_source_power(musb, 0 /*off*/, 1);
 
         /* delay, to avoid problems with module reload */
-        if (is_host_enabled(musb) && musb->xceiv.default_a) {
+        if (is_host_enabled(musb) && musb->xceiv->default_a) {
                 int     maxdelay = 30;
                 u8      devctl, warn = 0;
 
@@ -471,5 +469,7 @@ int musb_platform_exit(struct musb *musb)
 
         clk_disable(musb->clock);
 
+        usb_nop_xceiv_unregister();
+
         return 0;
 }
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 4000cf6d1e81..554a414f65d1 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -112,6 +112,7 @@
 #include "davinci.h"
 #endif
 
+#define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON)
 
 
 unsigned musb_debug;
@@ -267,7 +268,7 @@ void musb_load_testpacket(struct musb *musb)
 
 const char *otg_state_string(struct musb *musb)
 {
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         case OTG_STATE_A_IDLE:          return "a_idle";
         case OTG_STATE_A_WAIT_VRISE:    return "a_wait_vrise";
         case OTG_STATE_A_WAIT_BCON:     return "a_wait_bcon";
@@ -288,12 +289,6 @@ const char *otg_state_string(struct musb *musb)
 #ifdef  CONFIG_USB_MUSB_OTG
 
 /*
- * See also USB_OTG_1-3.pdf 6.6.5 Timers
- * REVISIT: Are the other timers done in the hardware?
- */
-#define TB_ASE0_BRST            100     /* Min 3.125 ms */
-
-/*
  * Handles OTG hnp timeouts, such as b_ase0_brst
  */
 void musb_otg_timer_func(unsigned long data)
@@ -302,16 +297,18 @@ void musb_otg_timer_func(unsigned long data)
         unsigned long   flags;
 
         spin_lock_irqsave(&musb->lock, flags);
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         case OTG_STATE_B_WAIT_ACON:
                 DBG(1, "HNP: b_wait_acon timeout; back to b_peripheral\n");
                 musb_g_disconnect(musb);
-                musb->xceiv.state = OTG_STATE_B_PERIPHERAL;
+                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                 musb->is_active = 0;
                 break;
+        case OTG_STATE_A_SUSPEND:
         case OTG_STATE_A_WAIT_BCON:
-                DBG(1, "HNP: a_wait_bcon timeout; back to a_host\n");
-                musb_hnp_stop(musb);
+                DBG(1, "HNP: %s timeout\n", otg_state_string(musb));
+                musb_set_vbus(musb, 0);
+                musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
                 break;
         default:
                 DBG(1, "HNP: Unhandled mode %s\n", otg_state_string(musb));
@@ -320,10 +317,8 @@ void musb_otg_timer_func(unsigned long data)
         spin_unlock_irqrestore(&musb->lock, flags);
 }
 
-static DEFINE_TIMER(musb_otg_timer, musb_otg_timer_func, 0, 0);
-
 /*
- * Stops the B-device HNP state. Caller must take care of locking.
+ * Stops the HNP transition. Caller must take care of locking.
  */
 void musb_hnp_stop(struct musb *musb)
 {
@@ -331,20 +326,17 @@ void musb_hnp_stop(struct musb *musb)
         void __iomem    *mbase = musb->mregs;
         u8      reg;
 
-        switch (musb->xceiv.state) {
+        DBG(1, "HNP: stop from %s\n", otg_state_string(musb));
+
+        switch (musb->xceiv->state) {
         case OTG_STATE_A_PERIPHERAL:
-        case OTG_STATE_A_WAIT_VFALL:
-        case OTG_STATE_A_WAIT_BCON:
-                DBG(1, "HNP: Switching back to A-host\n");
                 musb_g_disconnect(musb);
-                musb->xceiv.state = OTG_STATE_A_IDLE;
-                MUSB_HST_MODE(musb);
-                musb->is_active = 0;
+                DBG(1, "HNP: back to %s\n", otg_state_string(musb));
                 break;
         case OTG_STATE_B_HOST:
                 DBG(1, "HNP: Disabling HR\n");
                 hcd->self.is_b_host = 0;
-                musb->xceiv.state = OTG_STATE_B_PERIPHERAL;
+                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                 MUSB_DEV_MODE(musb);
                 reg = musb_readb(mbase, MUSB_POWER);
                 reg |= MUSB_POWER_SUSPENDM;
@@ -402,7 +394,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 
                 if (devctl & MUSB_DEVCTL_HM) {
 #ifdef CONFIG_USB_MUSB_HDRC_HCD
-                        switch (musb->xceiv.state) {
+                        switch (musb->xceiv->state) {
                         case OTG_STATE_A_SUSPEND:
                                 /* remote wakeup?  later, GetPortStatus
                                  * will stop RESUME signaling
@@ -425,12 +417,12 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                                 musb->rh_timer = jiffies
                                                 + msecs_to_jiffies(20);
 
-                                musb->xceiv.state = OTG_STATE_A_HOST;
+                                musb->xceiv->state = OTG_STATE_A_HOST;
                                 musb->is_active = 1;
                                 usb_hcd_resume_root_hub(musb_to_hcd(musb));
                                 break;
                         case OTG_STATE_B_WAIT_ACON:
-                                musb->xceiv.state = OTG_STATE_B_PERIPHERAL;
+                                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                                 musb->is_active = 1;
                                 MUSB_DEV_MODE(musb);
                                 break;
@@ -441,11 +433,11 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                         }
 #endif
                 } else {
-                        switch (musb->xceiv.state) {
+                        switch (musb->xceiv->state) {
 #ifdef CONFIG_USB_MUSB_HDRC_HCD
                         case OTG_STATE_A_SUSPEND:
                                 /* possibly DISCONNECT is upcoming */
-                                musb->xceiv.state = OTG_STATE_A_HOST;
+                                musb->xceiv->state = OTG_STATE_A_HOST;
                                 usb_hcd_resume_root_hub(musb_to_hcd(musb));
                                 break;
 #endif
@@ -490,7 +482,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                  */
                 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
                 musb->ep0_stage = MUSB_EP0_START;
-                musb->xceiv.state = OTG_STATE_A_IDLE;
+                musb->xceiv->state = OTG_STATE_A_IDLE;
                 MUSB_HST_MODE(musb);
                 musb_set_vbus(musb, 1);
 
@@ -516,7 +508,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                  * REVISIT:  do delays from lots of DEBUG_KERNEL checks
                  * make trouble here, keeping VBUS < 4.4V ?
                  */
-                switch (musb->xceiv.state) {
+                switch (musb->xceiv->state) {
                 case OTG_STATE_A_HOST:
                         /* recovery is dicey once we've gotten past the
                          * initial stages of enumeration, but if VBUS
@@ -594,37 +586,40 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                 if (devctl & MUSB_DEVCTL_LSDEV)
                         musb->port1_status |= USB_PORT_STAT_LOW_SPEED;
 
-                if (hcd->status_urb)
-                        usb_hcd_poll_rh_status(hcd);
-                else
-                        usb_hcd_resume_root_hub(hcd);
-
-                MUSB_HST_MODE(musb);
-
                 /* indicate new connection to OTG machine */
-                switch (musb->xceiv.state) {
+                switch (musb->xceiv->state) {
                 case OTG_STATE_B_PERIPHERAL:
                         if (int_usb & MUSB_INTR_SUSPEND) {
                                 DBG(1, "HNP: SUSPEND+CONNECT, now b_host\n");
-                                musb->xceiv.state = OTG_STATE_B_HOST;
-                                hcd->self.is_b_host = 1;
                                 int_usb &= ~MUSB_INTR_SUSPEND;
+                                goto b_host;
                         } else
                                 DBG(1, "CONNECT as b_peripheral???\n");
                         break;
                 case OTG_STATE_B_WAIT_ACON:
-                        DBG(1, "HNP: Waiting to switch to b_host state\n");
-                        musb->xceiv.state = OTG_STATE_B_HOST;
+                        DBG(1, "HNP: CONNECT, now b_host\n");
+b_host:
+                        musb->xceiv->state = OTG_STATE_B_HOST;
                         hcd->self.is_b_host = 1;
+                        musb->ignore_disconnect = 0;
+                        del_timer(&musb->otg_timer);
                         break;
                 default:
                         if ((devctl & MUSB_DEVCTL_VBUS)
                                         == (3 << MUSB_DEVCTL_VBUS_SHIFT)) {
-                                musb->xceiv.state = OTG_STATE_A_HOST;
+                                musb->xceiv->state = OTG_STATE_A_HOST;
                                 hcd->self.is_b_host = 0;
                         }
                         break;
                 }
+
+                /* poke the root hub */
+                MUSB_HST_MODE(musb);
+                if (hcd->status_urb)
+                        usb_hcd_poll_rh_status(hcd);
+                else
+                        usb_hcd_resume_root_hub(hcd);
+
                 DBG(1, "CONNECT (%s) devctl %02x\n",
                                 otg_state_string(musb), devctl);
         }
@@ -650,7 +645,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                         }
                 } else if (is_peripheral_capable()) {
                         DBG(1, "BUS RESET as %s\n", otg_state_string(musb));
-                        switch (musb->xceiv.state) {
+                        switch (musb->xceiv->state) {
 #ifdef CONFIG_USB_OTG
                         case OTG_STATE_A_SUSPEND:
                                 /* We need to ignore disconnect on suspend
@@ -661,24 +656,27 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                                 musb_g_reset(musb);
                                 /* FALLTHROUGH */
                         case OTG_STATE_A_WAIT_BCON:     /* OPT TD.4.7-900ms */
-                                DBG(1, "HNP: Setting timer as %s\n",
-                                                otg_state_string(musb));
-                                musb_otg_timer.data = (unsigned long)musb;
-                                mod_timer(&musb_otg_timer, jiffies
-                                        + msecs_to_jiffies(100));
+                                /* never use invalid T(a_wait_bcon) */
+                                DBG(1, "HNP: in %s, %d msec timeout\n",
+                                                otg_state_string(musb),
+                                                TA_WAIT_BCON(musb));
+                                mod_timer(&musb->otg_timer, jiffies
+                                        + msecs_to_jiffies(TA_WAIT_BCON(musb)));
                                 break;
                         case OTG_STATE_A_PERIPHERAL:
-                                musb_hnp_stop(musb);
+                                musb->ignore_disconnect = 0;
+                                del_timer(&musb->otg_timer);
+                                musb_g_reset(musb);
                                 break;
                         case OTG_STATE_B_WAIT_ACON:
                                 DBG(1, "HNP: RESET (%s), to b_peripheral\n",
                                         otg_state_string(musb));
-                                musb->xceiv.state = OTG_STATE_B_PERIPHERAL;
+                                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                                 musb_g_reset(musb);
                                 break;
 #endif
                         case OTG_STATE_B_IDLE:
-                                musb->xceiv.state = OTG_STATE_B_PERIPHERAL;
+                                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                                 /* FALLTHROUGH */
                         case OTG_STATE_B_PERIPHERAL:
                                 musb_g_reset(musb);
@@ -763,7 +761,7 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb,
                                 MUSB_MODE(musb), devctl);
                 handled = IRQ_HANDLED;
 
-                switch (musb->xceiv.state) {
+                switch (musb->xceiv->state) {
 #ifdef CONFIG_USB_MUSB_HDRC_HCD
                 case OTG_STATE_A_HOST:
                 case OTG_STATE_A_SUSPEND:
@@ -776,7 +774,16 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb,
 #endif  /* HOST */
 #ifdef CONFIG_USB_MUSB_OTG
                 case OTG_STATE_B_HOST:
-                        musb_hnp_stop(musb);
+                        /* REVISIT this behaves for "real disconnect"
+                         * cases; make sure the other transitions from
+                         * from B_HOST act right too.  The B_HOST code
+                         * in hnp_stop() is currently not used...
+                         */
+                        musb_root_disconnect(musb);
+                        musb_to_hcd(musb)->self.is_b_host = 0;
+                        musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
+                        MUSB_DEV_MODE(musb);
+                        musb_g_disconnect(musb);
                         break;
                 case OTG_STATE_A_PERIPHERAL:
                         musb_hnp_stop(musb);
@@ -805,26 +812,35 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb,
                                 otg_state_string(musb), devctl, power);
                 handled = IRQ_HANDLED;
 
-                switch (musb->xceiv.state) {
+                switch (musb->xceiv->state) {
 #ifdef  CONFIG_USB_MUSB_OTG
                 case OTG_STATE_A_PERIPHERAL:
-                        /*
-                         * We cannot stop HNP here, devctl BDEVICE might be
-                         * still set.
+                        /* We also come here if the cable is removed, since
+                         * this silicon doesn't report ID-no-longer-grounded.
+                         *
+                         * We depend on T(a_wait_bcon) to shut us down, and
+                         * hope users don't do anything dicey during this
+                         * undesired detour through A_WAIT_BCON.
                          */
+                        musb_hnp_stop(musb);
+                        usb_hcd_resume_root_hub(musb_to_hcd(musb));
+                        musb_root_disconnect(musb);
+                        musb_platform_try_idle(musb, jiffies
+                                        + msecs_to_jiffies(musb->a_wait_bcon
+                                                ? : OTG_TIME_A_WAIT_BCON));
                         break;
 #endif
                 case OTG_STATE_B_PERIPHERAL:
                         musb_g_suspend(musb);
                         musb->is_active = is_otg_enabled(musb)
-                                        && musb->xceiv.gadget->b_hnp_enable;
+                                        && musb->xceiv->gadget->b_hnp_enable;
                         if (musb->is_active) {
 #ifdef  CONFIG_USB_MUSB_OTG
-                                musb->xceiv.state = OTG_STATE_B_WAIT_ACON;
+                                musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
                                 DBG(1, "HNP: Setting timer for b_ase0_brst\n");
-                                musb_otg_timer.data = (unsigned long)musb;
-                                mod_timer(&musb_otg_timer, jiffies
-                                        + msecs_to_jiffies(TB_ASE0_BRST));
+                                mod_timer(&musb->otg_timer, jiffies
+                                        + msecs_to_jiffies(
+                                                        OTG_TIME_B_ASE0_BRST));
 #endif
                         }
                         break;
@@ -834,9 +850,9 @@ static irqreturn_t musb_stage2_irq(struct musb *musb, u8 int_usb,
                                         + msecs_to_jiffies(musb->a_wait_bcon));
                         break;
                 case OTG_STATE_A_HOST:
-                        musb->xceiv.state = OTG_STATE_A_SUSPEND;
+                        musb->xceiv->state = OTG_STATE_A_SUSPEND;
                         musb->is_active = is_otg_enabled(musb)
-                                        && musb->xceiv.host->b_hnp_enable;
+                                        && musb->xceiv->host->b_hnp_enable;
                         break;
                 case OTG_STATE_B_HOST:
                         /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */
@@ -1068,14 +1084,13 @@ static struct fifo_cfg __initdata mode_4_cfg[] = {
 { .hw_ep_num =  8, .style = FIFO_RX,   .maxpacket = 512, },
 { .hw_ep_num =  9, .style = FIFO_TX,   .maxpacket = 512, },
 { .hw_ep_num =  9, .style = FIFO_RX,   .maxpacket = 512, },
-{ .hw_ep_num = 10, .style = FIFO_TX,   .maxpacket = 512, },
-{ .hw_ep_num = 10, .style = FIFO_RX,   .maxpacket = 512, },
-{ .hw_ep_num = 11, .style = FIFO_TX,   .maxpacket = 512, },
-{ .hw_ep_num = 11, .style = FIFO_RX,   .maxpacket = 512, },
-{ .hw_ep_num = 12, .style = FIFO_TX,   .maxpacket = 512, },
-{ .hw_ep_num = 12, .style = FIFO_RX,   .maxpacket = 512, },
-{ .hw_ep_num = 13, .style = FIFO_TX,   .maxpacket = 512, },
-{ .hw_ep_num = 13, .style = FIFO_RX,   .maxpacket = 512, },
+{ .hw_ep_num = 10, .style = FIFO_TX,   .maxpacket = 256, },
+{ .hw_ep_num = 10, .style = FIFO_RX,   .maxpacket = 64, },
+{ .hw_ep_num = 11, .style = FIFO_TX,   .maxpacket = 256, },
+{ .hw_ep_num = 11, .style = FIFO_RX,   .maxpacket = 64, },
+{ .hw_ep_num = 12, .style = FIFO_TX,   .maxpacket = 256, },
+{ .hw_ep_num = 12, .style = FIFO_RX,   .maxpacket = 64, },
+{ .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, },
 { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, },
 { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, },
 };
@@ -1335,11 +1350,11 @@ static int __init musb_core_init(u16 musb_type, struct musb *musb)
         }
         if (reg & MUSB_CONFIGDATA_HBRXE) {
                 strcat(aInfo, ", HB-ISO Rx");
-                strcat(aInfo, " (X)");          /* no driver support */
+                musb->hb_iso_rx = true;
         }
         if (reg & MUSB_CONFIGDATA_HBTXE) {
                 strcat(aInfo, ", HB-ISO Tx");
-                strcat(aInfo, " (X)");          /* no driver support */
+                musb->hb_iso_tx = true;
         }
         if (reg & MUSB_CONFIGDATA_SOFTCONE)
                 strcat(aInfo, ", SoftConn");
@@ -1481,13 +1496,7 @@ static irqreturn_t generic_interrupt(int irq, void *__hci)
 
         spin_unlock_irqrestore(&musb->lock, flags);
 
-        /* REVISIT we sometimes get spurious IRQs on g_ep0
-         * not clear why...
-         */
-        if (retval != IRQ_HANDLED)
-                DBG(5, "spurious?\n");
-
-        return IRQ_HANDLED;
+        return retval;
 }
 
 #else
@@ -1687,8 +1696,9 @@ musb_vbus_store(struct device *dev, struct device_attribute *attr,
         }
 
         spin_lock_irqsave(&musb->lock, flags);
-        musb->a_wait_bcon = val;
-        if (musb->xceiv.state == OTG_STATE_A_WAIT_BCON)
+        /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
+        musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
+        if (musb->xceiv->state == OTG_STATE_A_WAIT_BCON)
                 musb->is_active = 0;
         musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
         spin_unlock_irqrestore(&musb->lock, flags);
@@ -1706,10 +1716,13 @@ musb_vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
 
         spin_lock_irqsave(&musb->lock, flags);
         val = musb->a_wait_bcon;
+        /* FIXME get_vbus_status() is normally #defined as false...
+         * and is effectively TUSB-specific.
+         */
         vbus = musb_platform_get_vbus_status(musb);
         spin_unlock_irqrestore(&musb->lock, flags);
 
-        return sprintf(buf, "Vbus %s, timeout %lu\n",
+        return sprintf(buf, "Vbus %s, timeout %lu msec\n",
                         vbus ? "on" : "off", val);
 }
 static DEVICE_ATTR(vbus, 0644, musb_vbus_show, musb_vbus_store);
@@ -1749,8 +1762,8 @@ static void musb_irq_work(struct work_struct *data)
         struct musb *musb = container_of(data, struct musb, irq_work);
         static int old_state;
 
-        if (musb->xceiv.state != old_state) {
-                old_state = musb->xceiv.state;
+        if (musb->xceiv->state != old_state) {
+                old_state = musb->xceiv->state;
                 sysfs_notify(&musb->controller->kobj, NULL, "mode");
         }
 }
@@ -1782,6 +1795,7 @@ allocate_instance(struct device *dev,
         hcd->uses_new_polling = 1;
 
         musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
+        musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON;
 #else
         musb = kzalloc(sizeof *musb, GFP_KERNEL);
         if (!musb)
@@ -1847,7 +1861,7 @@ static void musb_free(struct musb *musb)
         }
 
 #ifdef CONFIG_USB_MUSB_OTG
-        put_device(musb->xceiv.dev);
+        put_device(musb->xceiv->dev);
 #endif
 
 #ifdef CONFIG_USB_MUSB_HDRC_HCD
@@ -1928,10 +1942,18 @@ bad_config:
                 }
         }
 
-        /* assume vbus is off */
-
-        /* platform adjusts musb->mregs and musb->isr if needed,
-         * and activates clocks
+        /* The musb_platform_init() call:
+         *   - adjusts musb->mregs and musb->isr if needed,
+         *   - may initialize an integrated tranceiver
+         *   - initializes musb->xceiv, usually by otg_get_transceiver()
+         *   - activates clocks.
+         *   - stops powering VBUS
+         *   - assigns musb->board_set_vbus if host mode is enabled
+         *
+         * There are various transciever configurations.  Blackfin,
+         * DaVinci, TUSB60x0, and others integrate them.  OMAP3 uses
+         * external/discrete ones in various flavors (twl4030 family,
+         * isp1504, non-OTG, etc) mostly hooking up through ULPI.
          */
         musb->isr = generic_interrupt;
         status = musb_platform_init(musb);
@@ -1968,6 +1990,10 @@ bad_config:
         if (status < 0)
                 goto fail2;
 
+#ifdef CONFIG_USB_OTG
+        setup_timer(&musb->otg_timer, musb_otg_timer_func, (unsigned long) musb);
+#endif
+
         /* Init IRQ workqueue before request_irq */
         INIT_WORK(&musb->irq_work, musb_irq_work);
 
@@ -1999,17 +2025,17 @@ bad_config:
                                 ? "DMA" : "PIO",
                         musb->nIrq);
 
-#ifdef CONFIG_USB_MUSB_HDRC_HCD
-        /* host side needs more setup, except for no-host modes */
-        if (musb->board_mode != MUSB_PERIPHERAL) {
+        /* host side needs more setup */
+        if (is_host_enabled(musb)) {
                 struct usb_hcd  *hcd = musb_to_hcd(musb);
 
-                if (musb->board_mode == MUSB_OTG)
+                otg_set_host(musb->xceiv, &hcd->self);
+
+                if (is_otg_enabled(musb))
                         hcd->self.otg_port = 1;
-                musb->xceiv.host = &hcd->self;
+                musb->xceiv->host = &hcd->self;
                 hcd->power_budget = 2 * (plat->power ? : 250);
         }
-#endif                          /* CONFIG_USB_MUSB_HDRC_HCD */
 
         /* For the host-only role, we can activate right away.
          * (We expect the ID pin to be forcibly grounded!!)
@@ -2017,8 +2043,8 @@ bad_config:
          */
         if (!is_otg_enabled(musb) && is_host_enabled(musb)) {
                 MUSB_HST_MODE(musb);
-                musb->xceiv.default_a = 1;
-                musb->xceiv.state = OTG_STATE_A_IDLE;
+                musb->xceiv->default_a = 1;
+                musb->xceiv->state = OTG_STATE_A_IDLE;
 
                 status = usb_add_hcd(musb_to_hcd(musb), -1, 0);
                 if (status)
@@ -2033,8 +2059,8 @@ bad_config:
 
         } else /* peripheral is enabled */ {
                 MUSB_DEV_MODE(musb);
-                musb->xceiv.default_a = 0;
-                musb->xceiv.state = OTG_STATE_B_IDLE;
+                musb->xceiv->default_a = 0;
+                musb->xceiv->state = OTG_STATE_B_IDLE;
 
                 status = musb_gadget_setup(musb);
                 if (status)
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index efb39b5e55b5..f3772ca3b2cf 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -40,6 +40,7 @@
 #include <linux/interrupt.h>
 #include <linux/smp_lock.h>
 #include <linux/errno.h>
+#include <linux/timer.h>
 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/usb/ch9.h>
@@ -171,7 +172,8 @@ enum musb_h_ep0_state {
 
 /* peripheral side ep0 states */
 enum musb_g_ep0_state {
-        MUSB_EP0_STAGE_SETUP,           /* idle, waiting for setup */
+        MUSB_EP0_STAGE_IDLE,            /* idle, waiting for SETUP */
+        MUSB_EP0_STAGE_SETUP,           /* received SETUP */
         MUSB_EP0_STAGE_TX,              /* IN data */
         MUSB_EP0_STAGE_RX,              /* OUT data */
         MUSB_EP0_STAGE_STATUSIN,        /* (after OUT data) */
@@ -179,10 +181,15 @@ enum musb_g_ep0_state {
         MUSB_EP0_STAGE_ACKWAIT,         /* after zlp, before statusin */
 } __attribute__ ((packed));
 
-/* OTG protocol constants */
+/*
+ * OTG protocol constants.  See USB OTG 1.3 spec,
+ * sections 5.5 "Device Timings" and 6.6.5 "Timers".
+ */
 #define OTG_TIME_A_WAIT_VRISE   100             /* msec (max) */
-#define OTG_TIME_A_WAIT_BCON    0               /* 0=infinite; min 1000 msec */
-#define OTG_TIME_A_IDLE_BDIS    200             /* msec (min) */
+#define OTG_TIME_A_WAIT_BCON    1100            /* min 1 second */
+#define OTG_TIME_A_AIDL_BDIS    200             /* min 200 msec */
+#define OTG_TIME_B_ASE0_BRST    100             /* min 3.125 ms */
+
 
 /*************************** REGISTER ACCESS ********************************/
 
@@ -331,6 +338,8 @@ struct musb {
         struct list_head        control;        /* of musb_qh */
         struct list_head        in_bulk;        /* of musb_qh */
         struct list_head        out_bulk;       /* of musb_qh */
+
+        struct timer_list       otg_timer;
 #endif
 
         /* called with IRQs blocked; ON/nonzero implies starting a session,
@@ -355,7 +364,7 @@ struct musb {
         u16                     int_rx;
         u16                     int_tx;
 
-        struct otg_transceiver  xceiv;
+        struct otg_transceiver  *xceiv;
 
         int nIrq;
         unsigned                irq_wake:1;
@@ -386,6 +395,9 @@ struct musb {
         unsigned is_multipoint:1;
         unsigned ignore_disconnect:1;   /* during bus resets */
 
+        unsigned                hb_iso_rx:1;    /* high bandwidth iso rx? */
+        unsigned                hb_iso_tx:1;    /* high bandwidth iso tx? */
+
 #ifdef C_MP_TX
         unsigned bulk_split:1;
 #define can_bulk_split(musb,type) \
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index f79440cdfe7e..8b3c4e2ed7b8 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -310,7 +310,7 @@ static void txstate(struct musb *musb, struct musb_request *req)
                         /* setup DMA, then program endpoint CSR */
                         request_size = min(request->length,
                                                 musb_ep->dma->max_len);
-                        if (request_size <= musb_ep->packet_sz)
+                        if (request_size < musb_ep->packet_sz)
                                 musb_ep->dma->desired_mode = 0;
                         else
                                 musb_ep->dma->desired_mode = 1;
@@ -349,7 +349,8 @@ static void txstate(struct musb *musb, struct musb_request *req)
 #elif defined(CONFIG_USB_TI_CPPI_DMA)
                 /* program endpoint CSR first, then setup DMA */
                 csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
-                csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_DMAENAB;
+                csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE |
+                       MUSB_TXCSR_MODE;
                 musb_writew(epio, MUSB_TXCSR,
                         (MUSB_TXCSR_P_WZC_BITS & ~MUSB_TXCSR_P_UNDERRUN)
                                 | csr);
@@ -1405,7 +1406,7 @@ static int musb_gadget_wakeup(struct usb_gadget *gadget)
 
         spin_lock_irqsave(&musb->lock, flags);
 
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         case OTG_STATE_B_PERIPHERAL:
                 /* NOTE:  OTG state machine doesn't include B_SUSPENDED;
                  * that's part of the standard usb 1.1 state machine, and
@@ -1507,9 +1508,9 @@ static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
 {
         struct musb     *musb = gadget_to_musb(gadget);
 
-        if (!musb->xceiv.set_power)
+        if (!musb->xceiv->set_power)
                 return -EOPNOTSUPP;
-        return otg_set_power(&musb->xceiv, mA);
+        return otg_set_power(musb->xceiv, mA);
 }
 
 static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on)
@@ -1732,11 +1733,7 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 
                 spin_lock_irqsave(&musb->lock, flags);
 
-                /* REVISIT always use otg_set_peripheral(), handling
-                 * issues including the root hub one below ...
-                 */
-                musb->xceiv.gadget = &musb->g;
-                musb->xceiv.state = OTG_STATE_B_IDLE;
+                otg_set_peripheral(musb->xceiv, &musb->g);
                 musb->is_active = 1;
 
                 /* FIXME this ignores the softconnect flag.  Drivers are
@@ -1748,6 +1745,8 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
                 if (!is_otg_enabled(musb))
                         musb_start(musb);
 
+                otg_set_peripheral(musb->xceiv, &musb->g);
+
                 spin_unlock_irqrestore(&musb->lock, flags);
 
                 if (is_otg_enabled(musb)) {
@@ -1761,8 +1760,7 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
                         if (retval < 0) {
                                 DBG(1, "add_hcd failed, %d\n", retval);
                                 spin_lock_irqsave(&musb->lock, flags);
-                                musb->xceiv.gadget = NULL;
-                                musb->xceiv.state = OTG_STATE_UNDEFINED;
+                                otg_set_peripheral(musb->xceiv, NULL);
                                 musb->gadget_driver = NULL;
                                 musb->g.dev.driver = NULL;
                                 spin_unlock_irqrestore(&musb->lock, flags);
@@ -1845,8 +1843,9 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 
                 (void) musb_gadget_vbus_draw(&musb->g, 0);
 
-                musb->xceiv.state = OTG_STATE_UNDEFINED;
+                musb->xceiv->state = OTG_STATE_UNDEFINED;
                 stop_activity(musb, driver);
+                otg_set_peripheral(musb->xceiv, NULL);
 
                 DBG(3, "unregistering driver %s\n", driver->function);
                 spin_unlock_irqrestore(&musb->lock, flags);
@@ -1882,7 +1881,7 @@ EXPORT_SYMBOL(usb_gadget_unregister_driver);
 void musb_g_resume(struct musb *musb)
 {
         musb->is_suspended = 0;
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         case OTG_STATE_B_IDLE:
                 break;
         case OTG_STATE_B_WAIT_ACON:
@@ -1908,10 +1907,10 @@ void musb_g_suspend(struct musb *musb)
         devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
         DBG(3, "devctl %02x\n", devctl);
 
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         case OTG_STATE_B_IDLE:
                 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
-                        musb->xceiv.state = OTG_STATE_B_PERIPHERAL;
+                        musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                 break;
         case OTG_STATE_B_PERIPHERAL:
                 musb->is_suspended = 1;
@@ -1957,22 +1956,24 @@ void musb_g_disconnect(struct musb *musb)
                 spin_lock(&musb->lock);
         }
 
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         default:
 #ifdef  CONFIG_USB_MUSB_OTG
                 DBG(2, "Unhandled disconnect %s, setting a_idle\n",
                         otg_state_string(musb));
-                musb->xceiv.state = OTG_STATE_A_IDLE;
+                musb->xceiv->state = OTG_STATE_A_IDLE;
+                MUSB_HST_MODE(musb);
                 break;
         case OTG_STATE_A_PERIPHERAL:
-                musb->xceiv.state = OTG_STATE_A_WAIT_VFALL;
+                musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
+                MUSB_HST_MODE(musb);
                 break;
         case OTG_STATE_B_WAIT_ACON:
         case OTG_STATE_B_HOST:
 #endif
         case OTG_STATE_B_PERIPHERAL:
         case OTG_STATE_B_IDLE:
-                musb->xceiv.state = OTG_STATE_B_IDLE;
+                musb->xceiv->state = OTG_STATE_B_IDLE;
                 break;
         case OTG_STATE_B_SRP_INIT:
                 break;
@@ -2028,10 +2029,10 @@ __acquires(musb->lock)
          * or else after HNP, as A-Device
          */
         if (devctl & MUSB_DEVCTL_BDEVICE) {
-                musb->xceiv.state = OTG_STATE_B_PERIPHERAL;
+                musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
                 musb->g.is_a_peripheral = 0;
         } else if (is_otg_enabled(musb)) {
-                musb->xceiv.state = OTG_STATE_A_PERIPHERAL;
+                musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
                 musb->g.is_a_peripheral = 1;
         } else
                 WARN_ON(1);
diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c
index 3f5e30ddfa27..40ed50ecedff 100644
--- a/drivers/usb/musb/musb_gadget_ep0.c
+++ b/drivers/usb/musb/musb_gadget_ep0.c
@@ -4,6 +4,7 @@
  * Copyright 2005 Mentor Graphics Corporation
  * Copyright (C) 2005-2006 by Texas Instruments
  * Copyright (C) 2006-2007 Nokia Corporation
+ * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -58,7 +59,8 @@
 static char *decode_ep0stage(u8 stage)
 {
         switch (stage) {
-        case MUSB_EP0_STAGE_SETUP:      return "idle";
+        case MUSB_EP0_STAGE_IDLE:       return "idle";
+        case MUSB_EP0_STAGE_SETUP:      return "setup";
         case MUSB_EP0_STAGE_TX:         return "in";
         case MUSB_EP0_STAGE_RX:         return "out";
         case MUSB_EP0_STAGE_ACKWAIT:    return "wait";
@@ -628,7 +630,7 @@ irqreturn_t musb_g_ep0_irq(struct musb *musb)
                 musb_writew(regs, MUSB_CSR0,
                                 csr & ~MUSB_CSR0_P_SENTSTALL);
                 retval = IRQ_HANDLED;
-                musb->ep0_state = MUSB_EP0_STAGE_SETUP;
+                musb->ep0_state = MUSB_EP0_STAGE_IDLE;
                 csr = musb_readw(regs, MUSB_CSR0);
         }
 
@@ -636,7 +638,18 @@ irqreturn_t musb_g_ep0_irq(struct musb *musb)
         if (csr & MUSB_CSR0_P_SETUPEND) {
                 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SVDSETUPEND);
                 retval = IRQ_HANDLED;
-                musb->ep0_state = MUSB_EP0_STAGE_SETUP;
+                /* Transition into the early status phase */
+                switch (musb->ep0_state) {
+                case MUSB_EP0_STAGE_TX:
+                        musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT;
+                        break;
+                case MUSB_EP0_STAGE_RX:
+                        musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;
+                        break;
+                default:
+                        ERR("SetupEnd came in a wrong ep0stage %s",
+                            decode_ep0stage(musb->ep0_state));
+                }
                 csr = musb_readw(regs, MUSB_CSR0);
                 /* NOTE:  request may need completion */
         }
@@ -697,11 +710,31 @@ irqreturn_t musb_g_ep0_irq(struct musb *musb)
                         if (req)
                                 musb_g_ep0_giveback(musb, req);
                 }
+
+                /*
+                 * In case when several interrupts can get coalesced,
+                 * check to see if we've already received a SETUP packet...
+                 */
+                if (csr & MUSB_CSR0_RXPKTRDY)
+                        goto setup;
+
+                retval = IRQ_HANDLED;
+                musb->ep0_state = MUSB_EP0_STAGE_IDLE;
+                break;
+
+        case MUSB_EP0_STAGE_IDLE:
+                /*
+                 * This state is typically (but not always) indiscernible
+                 * from the status states since the corresponding interrupts
+                 * tend to happen within too little period of time (with only
+                 * a zero-length packet in between) and so get coalesced...
+                 */
                 retval = IRQ_HANDLED;
                 musb->ep0_state = MUSB_EP0_STAGE_SETUP;
                 /* FALLTHROUGH */
 
         case MUSB_EP0_STAGE_SETUP:
+setup:
                 if (csr & MUSB_CSR0_RXPKTRDY) {
                         struct usb_ctrlrequest  setup;
                         int                     handled = 0;
@@ -783,7 +816,7 @@ irqreturn_t musb_g_ep0_irq(struct musb *musb)
 stall:
                                 DBG(3, "stall (%d)\n", handled);
                                 musb->ackpend |= MUSB_CSR0_P_SENDSTALL;
-                                musb->ep0_state = MUSB_EP0_STAGE_SETUP;
+                                musb->ep0_state = MUSB_EP0_STAGE_IDLE;
 finish:
                                 musb_writew(regs, MUSB_CSR0,
                                                 musb->ackpend);
@@ -803,7 +836,7 @@ finish:
                 /* "can't happen" */
                 WARN_ON(1);
                 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SENDSTALL);
-                musb->ep0_state = MUSB_EP0_STAGE_SETUP;
+                musb->ep0_state = MUSB_EP0_STAGE_IDLE;
                 break;
         }
 
@@ -959,7 +992,7 @@ static int musb_g_ep0_halt(struct usb_ep *e, int value)
 
                 csr |= MUSB_CSR0_P_SENDSTALL;
                 musb_writew(regs, MUSB_CSR0, csr);
-                musb->ep0_state = MUSB_EP0_STAGE_SETUP;
+                musb->ep0_state = MUSB_EP0_STAGE_IDLE;
                 musb->ackpend = 0;
                 break;
         default:
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index db1b57415ec7..94a2a350a414 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -181,6 +181,19 @@ static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep)
         musb_writew(ep->regs, MUSB_TXCSR, txcsr);
 }
 
+static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh)
+{
+        if (is_in != 0 || ep->is_shared_fifo)
+                ep->in_qh  = qh;
+        if (is_in == 0 || ep->is_shared_fifo)
+                ep->out_qh = qh;
+}
+
+static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in)
+{
+        return is_in ? ep->in_qh : ep->out_qh;
+}
+
 /*
  * Start the URB at the front of an endpoint's queue
  * end must be claimed from the caller.
@@ -210,7 +223,6 @@ musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
         case USB_ENDPOINT_XFER_CONTROL:
                 /* control transfers always start with SETUP */
                 is_in = 0;
-                hw_ep->out_qh = qh;
                 musb->ep0_stage = MUSB_EP0_START;
                 buf = urb->setup_packet;
                 len = 8;
@@ -239,10 +251,7 @@ musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh)
                         epnum, buf + offset, len);
 
         /* Configure endpoint */
-        if (is_in || hw_ep->is_shared_fifo)
-                hw_ep->in_qh = qh;
-        else
-                hw_ep->out_qh = qh;
+        musb_ep_set_qh(hw_ep, is_in, qh);
         musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len);
 
         /* transmit may have more work: start it when it is time */
@@ -286,9 +295,8 @@ start:
         }
 }
 
-/* caller owns controller lock, irqs are blocked */
-static void
-__musb_giveback(struct musb *musb, struct urb *urb, int status)
+/* Context: caller owns controller lock, IRQs are blocked */
+static void musb_giveback(struct musb *musb, struct urb *urb, int status)
 __releases(musb->lock)
 __acquires(musb->lock)
 {
@@ -321,60 +329,57 @@ __acquires(musb->lock)
         spin_lock(&musb->lock);
 }
 
-/* for bulk/interrupt endpoints only */
-static inline void
-musb_save_toggle(struct musb_hw_ep *ep, int is_in, struct urb *urb)
+/* For bulk/interrupt endpoints only */
+static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
+                                    struct urb *urb)
 {
-        struct usb_device       *udev = urb->dev;
+        void __iomem            *epio = qh->hw_ep->regs;
         u16                     csr;
-        void __iomem            *epio = ep->regs;
-        struct musb_qh          *qh;
 
-        /* FIXME:  the current Mentor DMA code seems to have
+        /*
+         * FIXME: the current Mentor DMA code seems to have
          * problems getting toggle correct.
          */
 
-        if (is_in || ep->is_shared_fifo)
-                qh = ep->in_qh;
+        if (is_in)
+                csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE;
         else
-                qh = ep->out_qh;
+                csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE;
 
-        if (!is_in) {
-                csr = musb_readw(epio, MUSB_TXCSR);
-                usb_settoggle(udev, qh->epnum, 1,
-                        (csr & MUSB_TXCSR_H_DATATOGGLE)
-                                ? 1 : 0);
-        } else {
-                csr = musb_readw(epio, MUSB_RXCSR);
-                usb_settoggle(udev, qh->epnum, 0,
-                        (csr & MUSB_RXCSR_H_DATATOGGLE)
-                                ? 1 : 0);
-        }
+        usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
 }
 
-/* caller owns controller lock, irqs are blocked */
-static struct musb_qh *
-musb_giveback(struct musb_qh *qh, struct urb *urb, int status)
+/*
+ * Advance this hardware endpoint's queue, completing the specified URB and
+ * advancing to either the next URB queued to that qh, or else invalidating
+ * that qh and advancing to the next qh scheduled after the current one.
+ *
+ * Context: caller owns controller lock, IRQs are blocked
+ */
+static void musb_advance_schedule(struct musb *musb, struct urb *urb,
+                                  struct musb_hw_ep *hw_ep, int is_in)
 {
+        struct musb_qh          *qh = musb_ep_get_qh(hw_ep, is_in);
         struct musb_hw_ep       *ep = qh->hw_ep;
-        struct musb             *musb = ep->musb;
-        int                     is_in = usb_pipein(urb->pipe);
         int                     ready = qh->is_ready;
+        int                     status;
+
+        status = (urb->status == -EINPROGRESS) ? 0 : urb->status;
 
         /* save toggle eagerly, for paranoia */
         switch (qh->type) {
         case USB_ENDPOINT_XFER_BULK:
         case USB_ENDPOINT_XFER_INT:
-                musb_save_toggle(ep, is_in, urb);
+                musb_save_toggle(qh, is_in, urb);
                 break;
         case USB_ENDPOINT_XFER_ISOC:
-                if (status == 0 && urb->error_count)
+                if (urb->error_count)
                         status = -EXDEV;
                 break;
         }
 
         qh->is_ready = 0;
-        __musb_giveback(musb, urb, status);
+        musb_giveback(musb, urb, status);
         qh->is_ready = ready;
 
         /* reclaim resources (and bandwidth) ASAP; deschedule it, and
@@ -388,11 +393,8 @@ musb_giveback(struct musb_qh *qh, struct urb *urb, int status)
                 else
                         ep->tx_reinit = 1;
 
-                /* clobber old pointers to this qh */
-                if (is_in || ep->is_shared_fifo)
-                        ep->in_qh = NULL;
-                else
-                        ep->out_qh = NULL;
+                /* Clobber old pointers to this qh */
+                musb_ep_set_qh(ep, is_in, NULL);
                 qh->hep->hcpriv = NULL;
 
                 switch (qh->type) {
@@ -421,36 +423,10 @@ musb_giveback(struct musb_qh *qh, struct urb *urb, int status)
                         break;
                 }
         }
-        return qh;
-}
-
-/*
- * Advance this hardware endpoint's queue, completing the specified urb and
- * advancing to either the next urb queued to that qh, or else invalidating
- * that qh and advancing to the next qh scheduled after the current one.
- *
- * Context: caller owns controller lock, irqs are blocked
- */
-static void
-musb_advance_schedule(struct musb *musb, struct urb *urb,
-                struct musb_hw_ep *hw_ep, int is_in)
-{
-        struct musb_qh  *qh;
-
-        if (is_in || hw_ep->is_shared_fifo)
-                qh = hw_ep->in_qh;
-        else
-                qh = hw_ep->out_qh;
-
-        if (urb->status == -EINPROGRESS)
-                qh = musb_giveback(qh, urb, 0);
-        else
-                qh = musb_giveback(qh, urb, urb->status);
 
         if (qh != NULL && qh->is_ready) {
                 DBG(4, "... next ep%d %cX urb %p\n",
-                                hw_ep->epnum, is_in ? 'R' : 'T',
-                                next_urb(qh));
+                    hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh));
                 musb_start_urb(musb, is_in, qh);
         }
 }
@@ -629,7 +605,8 @@ musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
         musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg);
         musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg);
         /* NOTE: bulk combining rewrites high bits of maxpacket */
-        musb_writew(ep->regs, MUSB_RXMAXP, qh->maxpacket);
+        musb_writew(ep->regs, MUSB_RXMAXP,
+                        qh->maxpacket | ((qh->hb_mult - 1) << 11));
 
         ep->rx_reinit = 0;
 }
@@ -651,9 +628,10 @@ static bool musb_tx_dma_program(struct dma_controller *dma,
         csr = musb_readw(epio, MUSB_TXCSR);
         if (length > pkt_size) {
                 mode = 1;
-                csr |= MUSB_TXCSR_AUTOSET
-                        | MUSB_TXCSR_DMAMODE
-                        | MUSB_TXCSR_DMAENAB;
+                csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB;
+                /* autoset shouldn't be set in high bandwidth */
+                if (qh->hb_mult == 1)
+                        csr |= MUSB_TXCSR_AUTOSET;
         } else {
                 mode = 0;
                 csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE);
@@ -703,15 +681,8 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
         void __iomem            *mbase = musb->mregs;
         struct musb_hw_ep       *hw_ep = musb->endpoints + epnum;
         void __iomem            *epio = hw_ep->regs;
-        struct musb_qh          *qh;
-        u16                     packet_sz;
-
-        if (!is_out || hw_ep->is_shared_fifo)
-                qh = hw_ep->in_qh;
-        else
-                qh = hw_ep->out_qh;
-
-        packet_sz = qh->maxpacket;
+        struct musb_qh          *qh = musb_ep_get_qh(hw_ep, !is_out);
+        u16                     packet_sz = qh->maxpacket;
 
         DBG(3, "%s hw%d urb %p spd%d dev%d ep%d%s "
                                 "h_addr%02x h_port%02x bytes %d\n",
@@ -1129,17 +1100,14 @@ void musb_host_tx(struct musb *musb, u8 epnum)
         u16                     tx_csr;
         size_t                  length = 0;
         size_t                  offset = 0;
-        struct urb              *urb;
         struct musb_hw_ep       *hw_ep = musb->endpoints + epnum;
         void __iomem            *epio = hw_ep->regs;
-        struct musb_qh          *qh = hw_ep->is_shared_fifo ? hw_ep->in_qh
-                                                            : hw_ep->out_qh;
+        struct musb_qh          *qh = hw_ep->out_qh;
+        struct urb              *urb = next_urb(qh);
         u32                     status = 0;
         void __iomem            *mbase = musb->mregs;
         struct dma_channel      *dma;
 
-        urb = next_urb(qh);
-
         musb_ep_select(mbase, epnum);
         tx_csr = musb_readw(epio, MUSB_TXCSR);
 
@@ -1427,7 +1395,7 @@ static void musb_bulk_rx_nak_timeout(struct musb *musb, struct musb_hw_ep *ep)
                         urb->actual_length += dma->actual_len;
                         dma->actual_len = 0L;
                 }
-                musb_save_toggle(ep, 1, urb);
+                musb_save_toggle(cur_qh, 1, urb);
 
                 /* move cur_qh to end of queue */
                 list_move_tail(&cur_qh->ring, &musb->in_bulk);
@@ -1531,6 +1499,10 @@ void musb_host_rx(struct musb *musb, u8 epnum)
                         /* packet error reported later */
                         iso_err = true;
                 }
+        } else if (rx_csr & MUSB_RXCSR_INCOMPRX) {
+                DBG(3, "end %d high bandwidth incomplete ISO packet RX\n",
+                                epnum);
+                status = -EPROTO;
         }
 
         /* faults abort the transfer */
@@ -1738,7 +1710,11 @@ void musb_host_rx(struct musb *musb, u8 epnum)
                                 val &= ~MUSB_RXCSR_H_AUTOREQ;
                         else
                                 val |= MUSB_RXCSR_H_AUTOREQ;
-                        val |= MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAENAB;
+                        val |= MUSB_RXCSR_DMAENAB;
+
+                        /* autoclear shouldn't be set in high bandwidth */
+                        if (qh->hb_mult == 1)
+                                val |= MUSB_RXCSR_AUTOCLEAR;
 
                         musb_writew(epio, MUSB_RXCSR,
                                 MUSB_RXCSR_H_WZC_BITS | val);
@@ -1817,19 +1793,17 @@ static int musb_schedule(
                         epnum++, hw_ep++) {
                 int     diff;
 
-                if (is_in || hw_ep->is_shared_fifo) {
-                        if (hw_ep->in_qh  != NULL)
-                                continue;
-                } else  if (hw_ep->out_qh != NULL)
+                if (musb_ep_get_qh(hw_ep, is_in) != NULL)
                         continue;
 
                 if (hw_ep == musb->bulk_ep)
                         continue;
 
                 if (is_in)
-                        diff = hw_ep->max_packet_sz_rx - qh->maxpacket;
+                        diff = hw_ep->max_packet_sz_rx;
                 else
-                        diff = hw_ep->max_packet_sz_tx - qh->maxpacket;
+                        diff = hw_ep->max_packet_sz_tx;
+                diff -= (qh->maxpacket * qh->hb_mult);
 
                 if (diff >= 0 && best_diff > diff) {
                         best_diff = diff;
@@ -1932,15 +1906,27 @@ static int musb_urb_enqueue(
         qh->is_ready = 1;
 
         qh->maxpacket = le16_to_cpu(epd->wMaxPacketSize);
+        qh->type = usb_endpoint_type(epd);
 
-        /* no high bandwidth support yet */
-        if (qh->maxpacket & ~0x7ff) {
-                ret = -EMSGSIZE;
-                goto done;
+        /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier.
+         * Some musb cores don't support high bandwidth ISO transfers; and
+         * we don't (yet!) support high bandwidth interrupt transfers.
+         */
+        qh->hb_mult = 1 + ((qh->maxpacket >> 11) & 0x03);
+        if (qh->hb_mult > 1) {
+                int ok = (qh->type == USB_ENDPOINT_XFER_ISOC);
+
+                if (ok)
+                        ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx)
+                                || (usb_pipeout(urb->pipe) && musb->hb_iso_tx);
+                if (!ok) {
+                        ret = -EMSGSIZE;
+                        goto done;
+                }
+                qh->maxpacket &= 0x7ff;
         }
 
         qh->epnum = usb_endpoint_num(epd);
-        qh->type = usb_endpoint_type(epd);
 
         /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */
         qh->addr_reg = (u8) usb_pipedevice(urb->pipe);
@@ -2052,14 +2038,15 @@ done:
  * called with controller locked, irqs blocked
  * that hardware queue advances to the next transfer, unless prevented
  */
-static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh, int is_in)
+static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh)
 {
         struct musb_hw_ep       *ep = qh->hw_ep;
         void __iomem            *epio = ep->regs;
         unsigned                hw_end = ep->epnum;
         void __iomem            *regs = ep->musb->mregs;
-        u16                     csr;
+        int                     is_in = usb_pipein(urb->pipe);
         int                     status = 0;
+        u16                     csr;
 
         musb_ep_select(regs, hw_end);
 
@@ -2112,14 +2099,14 @@ static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 {
         struct musb             *musb = hcd_to_musb(hcd);
         struct musb_qh          *qh;
-        struct list_head        *sched;
         unsigned long           flags;
+        int                     is_in  = usb_pipein(urb->pipe);
         int                     ret;
 
         DBG(4, "urb=%p, dev%d ep%d%s\n", urb,
                         usb_pipedevice(urb->pipe),
                         usb_pipeendpoint(urb->pipe),
-                        usb_pipein(urb->pipe) ? "in" : "out");
+                        is_in ? "in" : "out");
 
         spin_lock_irqsave(&musb->lock, flags);
         ret = usb_hcd_check_unlink_urb(hcd, urb, status);
@@ -2130,47 +2117,25 @@ static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
         if (!qh)
                 goto done;
 
-        /* Any URB not actively programmed into endpoint hardware can be
+        /*
+         * Any URB not actively programmed into endpoint hardware can be
          * immediately given back; that's any URB not at the head of an
          * endpoint queue, unless someday we get real DMA queues.  And even
          * if it's at the head, it might not be known to the hardware...
          *
-         * Otherwise abort current transfer, pending dma, etc.; urb->status
+         * Otherwise abort current transfer, pending DMA, etc.; urb->status
          * has already been updated.  This is a synchronous abort; it'd be
          * OK to hold off until after some IRQ, though.
+         *
+         * NOTE: qh is invalid unless !list_empty(&hep->urb_list)
          */
-        if (!qh->is_ready || urb->urb_list.prev != &qh->hep->urb_list)
-                ret = -EINPROGRESS;
-        else {
-                switch (qh->type) {
-                case USB_ENDPOINT_XFER_CONTROL:
-                        sched = &musb->control;
-                        break;
-                case USB_ENDPOINT_XFER_BULK:
-                        if (qh->mux == 1) {
-                                if (usb_pipein(urb->pipe))
-                                        sched = &musb->in_bulk;
-                                else
-                                        sched = &musb->out_bulk;
-                                break;
-                        }
-                default:
-                        /* REVISIT when we get a schedule tree, periodic
-                         * transfers won't always be at the head of a
-                         * singleton queue...
-                         */
-                        sched = NULL;
-                        break;
-                }
-        }
-
-        /* NOTE:  qh is invalid unless !list_empty(&hep->urb_list) */
-        if (ret < 0 || (sched && qh != first_qh(sched))) {
+        if (!qh->is_ready
+                        || urb->urb_list.prev != &qh->hep->urb_list
+                        || musb_ep_get_qh(qh->hw_ep, is_in) != qh) {
                 int     ready = qh->is_ready;
 
-                ret = 0;
                 qh->is_ready = 0;
-                __musb_giveback(musb, urb, 0);
+                musb_giveback(musb, urb, 0);
                 qh->is_ready = ready;
 
                 /* If nothing else (usually musb_giveback) is using it
@@ -2182,7 +2147,7 @@ static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
                         kfree(qh);
                 }
         } else
-                ret = musb_cleanup_urb(urb, qh, urb->pipe & USB_DIR_IN);
+                ret = musb_cleanup_urb(urb, qh);
 done:
         spin_unlock_irqrestore(&musb->lock, flags);
         return ret;
@@ -2192,13 +2157,11 @@ done:
 static void
 musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
 {
-        u8                      epnum = hep->desc.bEndpointAddress;
+        u8                      is_in = hep->desc.bEndpointAddress & USB_DIR_IN;
         unsigned long           flags;
         struct musb             *musb = hcd_to_musb(hcd);
-        u8                      is_in = epnum & USB_DIR_IN;
         struct musb_qh          *qh;
         struct urb              *urb;
-        struct list_head        *sched;
 
         spin_lock_irqsave(&musb->lock, flags);
 
@@ -2206,31 +2169,11 @@ musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
         if (qh == NULL)
                 goto exit;
 
-        switch (qh->type) {
-        case USB_ENDPOINT_XFER_CONTROL:
-                sched = &musb->control;
-                break;
-        case USB_ENDPOINT_XFER_BULK:
-                if (qh->mux == 1) {
-                        if (is_in)
-                                sched = &musb->in_bulk;
-                        else
-                                sched = &musb->out_bulk;
-                        break;
-                }
-        default:
-                /* REVISIT when we get a schedule tree, periodic transfers
-                 * won't always be at the head of a singleton queue...
-                 */
-                sched = NULL;
-                break;
-        }
-
-        /* NOTE:  qh is invalid unless !list_empty(&hep->urb_list) */
+        /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */
 
-        /* kick first urb off the hardware, if needed */
+        /* Kick the first URB off the hardware, if needed */
         qh->is_ready = 0;
-        if (!sched || qh == first_qh(sched)) {
+        if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) {
                 urb = next_urb(qh);
 
                 /* make software (then hardware) stop ASAP */
@@ -2238,7 +2181,7 @@ musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
                         urb->status = -ESHUTDOWN;
 
                 /* cleanup */
-                musb_cleanup_urb(urb, qh, urb->pipe & USB_DIR_IN);
+                musb_cleanup_urb(urb, qh);
 
                 /* Then nuke all the others ... and advance the
                  * queue on hw_ep (e.g. bulk ring) when we're done.
@@ -2254,7 +2197,7 @@ musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
                  * will activate any of these as it advances.
                  */
                 while (!list_empty(&hep->urb_list))
-                        __musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
+                        musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
 
                 hep->hcpriv = NULL;
                 list_del(&qh->ring);
@@ -2293,7 +2236,7 @@ static int musb_bus_suspend(struct usb_hcd *hcd)
 {
         struct musb     *musb = hcd_to_musb(hcd);
 
-        if (musb->xceiv.state == OTG_STATE_A_SUSPEND)
+        if (musb->xceiv->state == OTG_STATE_A_SUSPEND)
                 return 0;
 
         if (is_host_active(musb) && musb->is_active) {
diff --git a/drivers/usb/musb/musb_host.h b/drivers/usb/musb/musb_host.h
index 0b7fbcd21963..14b00776638d 100644
--- a/drivers/usb/musb/musb_host.h
+++ b/drivers/usb/musb/musb_host.h
@@ -67,6 +67,7 @@ struct musb_qh {
         u8                      is_ready;       /* safe to modify hw_ep */
         u8                      type;           /* XFERTYPE_* */
         u8                      epnum;
+        u8                      hb_mult;        /* high bandwidth pkts per uf */
         u16                     maxpacket;
         u16                     frame;          /* for periodic schedule */
         unsigned                iso_idx;        /* in urb->iso_frame_desc[] */
diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c
index bf677acc83db..bfe5fe4ebfee 100644
--- a/drivers/usb/musb/musb_virthub.c
+++ b/drivers/usb/musb/musb_virthub.c
@@ -78,18 +78,22 @@ static void musb_port_suspend(struct musb *musb, bool do_suspend)
                 DBG(3, "Root port suspended, power %02x\n", power);
 
                 musb->port1_status |= USB_PORT_STAT_SUSPEND;
-                switch (musb->xceiv.state) {
+                switch (musb->xceiv->state) {
                 case OTG_STATE_A_HOST:
-                        musb->xceiv.state = OTG_STATE_A_SUSPEND;
+                        musb->xceiv->state = OTG_STATE_A_SUSPEND;
                         musb->is_active = is_otg_enabled(musb)
-                                        && musb->xceiv.host->b_hnp_enable;
+                                        && musb->xceiv->host->b_hnp_enable;
+                        if (musb->is_active)
+                                mod_timer(&musb->otg_timer, jiffies
+                                        + msecs_to_jiffies(
+                                                OTG_TIME_A_AIDL_BDIS));
                         musb_platform_try_idle(musb, 0);
                         break;
 #ifdef  CONFIG_USB_MUSB_OTG
                 case OTG_STATE_B_HOST:
-                        musb->xceiv.state = OTG_STATE_B_WAIT_ACON;
+                        musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
                         musb->is_active = is_otg_enabled(musb)
-                                        && musb->xceiv.host->b_hnp_enable;
+                                        && musb->xceiv->host->b_hnp_enable;
                         musb_platform_try_idle(musb, 0);
                         break;
 #endif
@@ -116,7 +120,7 @@ static void musb_port_reset(struct musb *musb, bool do_reset)
         void __iomem    *mbase = musb->mregs;
 
 #ifdef CONFIG_USB_MUSB_OTG
-        if (musb->xceiv.state == OTG_STATE_B_IDLE) {
+        if (musb->xceiv->state == OTG_STATE_B_IDLE) {
                 DBG(2, "HNP: Returning from HNP; no hub reset from b_idle\n");
                 musb->port1_status &= ~USB_PORT_STAT_RESET;
                 return;
@@ -186,14 +190,23 @@ void musb_root_disconnect(struct musb *musb)
         usb_hcd_poll_rh_status(musb_to_hcd(musb));
         musb->is_active = 0;
 
-        switch (musb->xceiv.state) {
-        case OTG_STATE_A_HOST:
+        switch (musb->xceiv->state) {
         case OTG_STATE_A_SUSPEND:
-                musb->xceiv.state = OTG_STATE_A_WAIT_BCON;
+#ifdef  CONFIG_USB_MUSB_OTG
+                if (is_otg_enabled(musb)
+                                && musb->xceiv->host->b_hnp_enable) {
+                        musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
+                        musb->g.is_a_peripheral = 1;
+                        break;
+                }
+#endif
+                /* FALLTHROUGH */
+        case OTG_STATE_A_HOST:
+                musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
                 musb->is_active = 0;
                 break;
         case OTG_STATE_A_WAIT_VFALL:
-                musb->xceiv.state = OTG_STATE_B_IDLE;
+                musb->xceiv->state = OTG_STATE_B_IDLE;
                 break;
         default:
                 DBG(1, "host disconnect (%s)\n", otg_state_string(musb));
@@ -332,7 +345,7 @@ int musb_hub_control(
                         musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
                         usb_hcd_poll_rh_status(musb_to_hcd(musb));
                         /* NOTE: it might really be A_WAIT_BCON ... */
-                        musb->xceiv.state = OTG_STATE_A_HOST;
+                        musb->xceiv->state = OTG_STATE_A_HOST;
                 }
 
                 put_unaligned(cpu_to_le32(musb->port1_status
diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index 60924ce08493..34875201ee04 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -44,7 +44,6 @@
 #define get_cpu_rev()   2
 #endif
 
-#define MUSB_TIMEOUT_A_WAIT_BCON        1100
 
 static struct timer_list musb_idle_timer;
 
@@ -61,17 +60,17 @@ static void musb_do_idle(unsigned long _musb)
 
         devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
 
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         case OTG_STATE_A_WAIT_BCON:
                 devctl &= ~MUSB_DEVCTL_SESSION;
                 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 
                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
                 if (devctl & MUSB_DEVCTL_BDEVICE) {
-                        musb->xceiv.state = OTG_STATE_B_IDLE;
+                        musb->xceiv->state = OTG_STATE_B_IDLE;
                         MUSB_DEV_MODE(musb);
                 } else {
-                        musb->xceiv.state = OTG_STATE_A_IDLE;
+                        musb->xceiv->state = OTG_STATE_A_IDLE;
                         MUSB_HST_MODE(musb);
                 }
                 break;
@@ -89,7 +88,7 @@ static void musb_do_idle(unsigned long _musb)
                         musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
                         usb_hcd_poll_rh_status(musb_to_hcd(musb));
                         /* NOTE: it might really be A_WAIT_BCON ... */
-                        musb->xceiv.state = OTG_STATE_A_HOST;
+                        musb->xceiv->state = OTG_STATE_A_HOST;
                 }
                 break;
 #endif
@@ -97,9 +96,9 @@ static void musb_do_idle(unsigned long _musb)
         case OTG_STATE_A_HOST:
                 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
                 if (devctl &  MUSB_DEVCTL_BDEVICE)
-                        musb->xceiv.state = OTG_STATE_B_IDLE;
+                        musb->xceiv->state = OTG_STATE_B_IDLE;
                 else
-                        musb->xceiv.state = OTG_STATE_A_WAIT_BCON;
+                        musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 #endif
         default:
                 break;
@@ -118,7 +117,7 @@ void musb_platform_try_idle(struct musb *musb, unsigned long timeout)
 
         /* Never idle if active, or when VBUS timeout is not set as host */
         if (musb->is_active || ((musb->a_wait_bcon == 0)
-                        && (musb->xceiv.state == OTG_STATE_A_WAIT_BCON))) {
+                        && (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
                 DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
                 del_timer(&musb_idle_timer);
                 last_timer = jiffies;
@@ -163,8 +162,8 @@ static void omap_set_vbus(struct musb *musb, int is_on)
 
         if (is_on) {
                 musb->is_active = 1;
-                musb->xceiv.default_a = 1;
-                musb->xceiv.state = OTG_STATE_A_WAIT_VRISE;
+                musb->xceiv->default_a = 1;
+                musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
                 devctl |= MUSB_DEVCTL_SESSION;
 
                 MUSB_HST_MODE(musb);
@@ -175,8 +174,8 @@ static void omap_set_vbus(struct musb *musb, int is_on)
                  * jumping right to B_IDLE...
                  */
 
-                musb->xceiv.default_a = 0;
-                musb->xceiv.state = OTG_STATE_B_IDLE;
+                musb->xceiv->default_a = 0;
+                musb->xceiv->state = OTG_STATE_B_IDLE;
                 devctl &= ~MUSB_DEVCTL_SESSION;
 
                 MUSB_DEV_MODE(musb);
@@ -188,10 +187,6 @@ static void omap_set_vbus(struct musb *musb, int is_on)
                 otg_state_string(musb),
                 musb_readb(musb->mregs, MUSB_DEVCTL));
 }
-static int omap_set_power(struct otg_transceiver *x, unsigned mA)
-{
-        return 0;
-}
 
 static int musb_platform_resume(struct musb *musb);
 
@@ -202,24 +197,6 @@ int musb_platform_set_mode(struct musb *musb, u8 musb_mode)
         devctl |= MUSB_DEVCTL_SESSION;
         musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 
-        switch (musb_mode) {
-#ifdef CONFIG_USB_MUSB_HDRC_HCD
-        case MUSB_HOST:
-                otg_set_host(&musb->xceiv, musb->xceiv.host);
-                break;
-#endif
-#ifdef CONFIG_USB_GADGET_MUSB_HDRC
-        case MUSB_PERIPHERAL:
-                otg_set_peripheral(&musb->xceiv, musb->xceiv.gadget);
-                break;
-#endif
-#ifdef CONFIG_USB_MUSB_OTG
-        case MUSB_OTG:
-                break;
-#endif
-        default:
-                return -EINVAL;
-        }
         return 0;
 }
 
@@ -231,6 +208,16 @@ int __init musb_platform_init(struct musb *musb)
         omap_cfg_reg(AE5_2430_USB0HS_STP);
 #endif
 
+        /* We require some kind of external transceiver, hooked
+         * up through ULPI.  TWL4030-family PMICs include one,
+         * which needs a driver, drivers aren't always needed.
+         */
+        musb->xceiv = otg_get_transceiver();
+        if (!musb->xceiv) {
+                pr_err("HS USB OTG: no transceiver configured\n");
+                return -ENODEV;
+        }
+
         musb_platform_resume(musb);
 
         l = omap_readl(OTG_SYSCONFIG);
@@ -240,7 +227,12 @@ int __init musb_platform_init(struct musb *musb)
         l &= ~AUTOIDLE;         /* disable auto idle */
         l &= ~NOIDLE;           /* remove possible noidle */
         l |= SMARTIDLE;         /* enable smart idle */
-        l |= AUTOIDLE;          /* enable auto idle */
+        /*
+         * MUSB AUTOIDLE don't work in 3430.
+         * Workaround by Richard Woodruff/TI
+         */
+        if (!cpu_is_omap3430())
+                l |= AUTOIDLE;          /* enable auto idle */
         omap_writel(l, OTG_SYSCONFIG);
 
         l = omap_readl(OTG_INTERFSEL);
@@ -257,9 +249,6 @@ int __init musb_platform_init(struct musb *musb)
 
         if (is_host_enabled(musb))
                 musb->board_set_vbus = omap_set_vbus;
-        if (is_peripheral_enabled(musb))
-                musb->xceiv.set_power = omap_set_power;
-        musb->a_wait_bcon = MUSB_TIMEOUT_A_WAIT_BCON;
 
         setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
 
@@ -282,8 +271,7 @@ int musb_platform_suspend(struct musb *musb)
         l |= ENABLEWAKEUP;      /* enable wakeup */
         omap_writel(l, OTG_SYSCONFIG);
 
-        if (musb->xceiv.set_suspend)
-                musb->xceiv.set_suspend(&musb->xceiv, 1);
+        otg_set_suspend(musb->xceiv, 1);
 
         if (musb->set_clock)
                 musb->set_clock(musb->clock, 0);
@@ -300,8 +288,7 @@ static int musb_platform_resume(struct musb *musb)
         if (!musb->clock)
                 return 0;
 
-        if (musb->xceiv.set_suspend)
-                musb->xceiv.set_suspend(&musb->xceiv, 0);
+        otg_set_suspend(musb->xceiv, 0);
 
         if (musb->set_clock)
                 musb->set_clock(musb->clock, 1);
diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index 4ac1477d3569..88b587c703e9 100644
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -259,6 +259,8 @@ void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *buf)
                 tusb_fifo_read_unaligned(fifo, buf, len);
 }
 
+static struct musb *the_musb;
+
 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
 
 /* This is used by gadget drivers, and OTG transceiver logic, allowing
@@ -269,7 +271,7 @@ void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *buf)
  */
 static int tusb_draw_power(struct otg_transceiver *x, unsigned mA)
 {
-        struct musb     *musb = container_of(x, struct musb, xceiv);
+        struct musb     *musb = the_musb;
         void __iomem    *tbase = musb->ctrl_base;
         u32             reg;
 
@@ -419,7 +421,7 @@ static void musb_do_idle(unsigned long _musb)
 
         spin_lock_irqsave(&musb->lock, flags);
 
-        switch (musb->xceiv.state) {
+        switch (musb->xceiv->state) {
         case OTG_STATE_A_WAIT_BCON:
                 if ((musb->a_wait_bcon != 0)
                         && (musb->idle_timeout == 0
@@ -483,7 +485,7 @@ void musb_platform_try_idle(struct musb *musb, unsigned long timeout)
 
         /* Never idle if active, or when VBUS timeout is not set as host */
         if (musb->is_active || ((musb->a_wait_bcon == 0)
-                        && (musb->xceiv.state == OTG_STATE_A_WAIT_BCON))) {
+                        && (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
                 DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
                 del_timer(&musb_idle_timer);
                 last_timer = jiffies;
@@ -532,8 +534,8 @@ static void tusb_source_power(struct musb *musb, int is_on)
                 if (musb->set_clock)
                         musb->set_clock(musb->clock, 1);
                 timer = OTG_TIMER_MS(OTG_TIME_A_WAIT_VRISE);
-                musb->xceiv.default_a = 1;
-                musb->xceiv.state = OTG_STATE_A_WAIT_VRISE;
+                musb->xceiv->default_a = 1;
+                musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
                 devctl |= MUSB_DEVCTL_SESSION;
 
                 conf |= TUSB_DEV_CONF_USB_HOST_MODE;
@@ -546,24 +548,24 @@ static void tusb_source_power(struct musb *musb, int is_on)
                 /* If ID pin is grounded, we want to be a_idle */
                 otg_stat = musb_readl(tbase, TUSB_DEV_OTG_STAT);
                 if (!(otg_stat & TUSB_DEV_OTG_STAT_ID_STATUS)) {
-                        switch (musb->xceiv.state) {
+                        switch (musb->xceiv->state) {
                         case OTG_STATE_A_WAIT_VRISE:
                         case OTG_STATE_A_WAIT_BCON:
-                                musb->xceiv.state = OTG_STATE_A_WAIT_VFALL;
+                                musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
                                 break;
                         case OTG_STATE_A_WAIT_VFALL:
-                                musb->xceiv.state = OTG_STATE_A_IDLE;
+                                musb->xceiv->state = OTG_STATE_A_IDLE;
                                 break;
                         default:
-                                musb->xceiv.state = OTG_STATE_A_IDLE;
+                                musb->xceiv->state = OTG_STATE_A_IDLE;
                         }
                         musb->is_active = 0;
-                        musb->xceiv.default_a = 1;
+                        musb->xceiv->default_a = 1;
                         MUSB_HST_MODE(musb);
                 } else {
                         musb->is_active = 0;
-                        musb->xceiv.default_a = 0;
-                        musb->xceiv.state = OTG_STATE_B_IDLE;
+                        musb->xceiv->default_a = 0;
+                        musb->xceiv->state = OTG_STATE_B_IDLE;
                         MUSB_DEV_MODE(musb);
                 }
 
@@ -674,7 +676,7 @@ tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase)
                 else
                         default_a = is_host_enabled(musb);
                 DBG(2, "Default-%c\n", default_a ? 'A' : 'B');
-                musb->xceiv.default_a = default_a;
+                musb->xceiv->default_a = default_a;
                 tusb_source_power(musb, default_a);
 
                 /* Don't allow idling immediately */
@@ -686,7 +688,7 @@ tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase)
         if (int_src & TUSB_INT_SRC_VBUS_SENSE_CHNG) {
 
                 /* B-dev state machine:  no vbus ~= disconnect */
-                if ((is_otg_enabled(musb) && !musb->xceiv.default_a)
+                if ((is_otg_enabled(musb) && !musb->xceiv->default_a)
                                 || !is_host_enabled(musb)) {
 #ifdef CONFIG_USB_MUSB_HDRC_HCD
                         /* ? musb_root_disconnect(musb); */
@@ -701,9 +703,9 @@ tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase)
 
                         if (otg_stat & TUSB_DEV_OTG_STAT_SESS_END) {
                                 DBG(1, "Forcing disconnect (no interrupt)\n");
-                                if (musb->xceiv.state != OTG_STATE_B_IDLE) {
+                                if (musb->xceiv->state != OTG_STATE_B_IDLE) {
                                         /* INTR_DISCONNECT can hide... */
-                                        musb->xceiv.state = OTG_STATE_B_IDLE;
+                                        musb->xceiv->state = OTG_STATE_B_IDLE;
                                         musb->int_usb |= MUSB_INTR_DISCONNECT;
                                 }
                                 musb->is_active = 0;
@@ -717,7 +719,7 @@ tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase)
                         DBG(2, "vbus change, %s, otg %03x\n",
                                 otg_state_string(musb), otg_stat);
 
-                        switch (musb->xceiv.state) {
+                        switch (musb->xceiv->state) {
                         case OTG_STATE_A_IDLE:
                                 DBG(2, "Got SRP, turning on VBUS\n");
                                 musb_set_vbus(musb, 1);
@@ -765,7 +767,7 @@ tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase)
 
                 DBG(4, "%s timer, %03x\n", otg_state_string(musb), otg_stat);
 
-                switch (musb->xceiv.state) {
+                switch (musb->xceiv->state) {
                 case OTG_STATE_A_WAIT_VRISE:
                         /* VBUS has probably been valid for a while now,
                          * but may well have bounced out of range a bit
@@ -777,7 +779,7 @@ tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase)
                                         DBG(2, "devctl %02x\n", devctl);
                                         break;
                                 }
-                                musb->xceiv.state = OTG_STATE_A_WAIT_BCON;
+                                musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
                                 musb->is_active = 0;
                                 idle_timeout = jiffies
                                         + msecs_to_jiffies(musb->a_wait_bcon);
@@ -1093,9 +1095,14 @@ int __init musb_platform_init(struct musb *musb)
 {
         struct platform_device  *pdev;
         struct resource         *mem;
-        void __iomem            *sync;
+        void __iomem            *sync = NULL;
         int                     ret;
 
+        usb_nop_xceiv_register();
+        musb->xceiv = otg_get_transceiver();
+        if (!musb->xceiv)
+                return -ENODEV;
+
         pdev = to_platform_device(musb->controller);
 
         /* dma address for async dma */
@@ -1106,14 +1113,16 @@ int __init musb_platform_init(struct musb *musb)
         mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
         if (!mem) {
                 pr_debug("no sync dma resource?\n");
-                return -ENODEV;
+                ret = -ENODEV;
+                goto done;
         }
         musb->sync = mem->start;
 
         sync = ioremap(mem->start, mem->end - mem->start + 1);
         if (!sync) {
                 pr_debug("ioremap for sync failed\n");
-                return -ENOMEM;
+                ret = -ENOMEM;
+                goto done;
         }
         musb->sync_va = sync;
 
@@ -1126,28 +1135,37 @@ int __init musb_platform_init(struct musb *musb)
         if (ret) {
                 printk(KERN_ERR "Could not start tusb6010 (%d)\n",
                                 ret);
-                return -ENODEV;
+                goto done;
         }
         musb->isr = tusb_interrupt;
 
         if (is_host_enabled(musb))
                 musb->board_set_vbus = tusb_source_power;
-        if (is_peripheral_enabled(musb))
-                musb->xceiv.set_power = tusb_draw_power;
+        if (is_peripheral_enabled(musb)) {
+                musb->xceiv->set_power = tusb_draw_power;
+                the_musb = musb;
+        }
 
         setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
 
+done:
+        if (ret < 0) {
+                if (sync)
+                        iounmap(sync);
+                usb_nop_xceiv_unregister();
+        }
         return ret;
 }
 
 int musb_platform_exit(struct musb *musb)
 {
         del_timer_sync(&musb_idle_timer);
+        the_musb = NULL;
 
         if (musb->board_set_power)
                 musb->board_set_power(0);
 
         iounmap(musb->sync_va);
-
+        usb_nop_xceiv_unregister();
         return 0;
 }
diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index aa884d072f0b..69feeec1628c 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -59,4 +59,18 @@ config NOP_USB_XCEIV
          built-in with usb ip or which are autonomous and doesn't require any
          phy programming such as ISP1x04 etc.
 
+config USB_LANGWELL_OTG
+        tristate "Intel Langwell USB OTG dual-role support"
+        depends on USB && MRST
+        select USB_OTG
+        select USB_OTG_UTILS
+        help
+          Say Y here if you want to build Intel Langwell USB OTG
+          transciever driver in kernel. This driver implements role
+          switch between EHCI host driver and Langwell USB OTG
+          client driver.
+
+          To compile this driver as a module, choose M here: the
+          module will be called langwell_otg.
+
 endif # USB || OTG
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
index 208167856529..6d1abdd3c0ac 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_USB_OTG_UTILS)	+= otg.o
 obj-$(CONFIG_USB_GPIO_VBUS)     += gpio_vbus.o
 obj-$(CONFIG_ISP1301_OMAP)      += isp1301_omap.o
 obj-$(CONFIG_TWL4030_USB)       += twl4030-usb.o
+obj-$(CONFIG_USB_LANGWELL_OTG)  += langwell_otg.o
 obj-$(CONFIG_NOP_USB_XCEIV)     += nop-usb-xceiv.o
 
 ccflags-$(CONFIG_USB_DEBUG)     += -DDEBUG
diff --git a/drivers/usb/otg/langwell_otg.c b/drivers/usb/otg/langwell_otg.c
new file mode 100644
index 000000000000..6f628d0e9f39
--- /dev/null
+++ b/drivers/usb/otg/langwell_otg.c
@@ -0,0 +1,1915 @@
+/*
+ * Intel Langwell USB OTG transceiver driver
+ * Copyright (C) 2008 - 2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+/* This driver helps to switch Langwell OTG controller function between host
+ * and peripheral. It works with EHCI driver and Langwell client controller
+ * driver together.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/moduleparam.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb.h>
+#include <linux/usb/otg.h>
+#include <linux/notifier.h>
+#include <asm/ipc_defs.h>
+#include <linux/delay.h>
+#include "../core/hcd.h"
+
+#include <linux/usb/langwell_otg.h>
+
+#define DRIVER_DESC             "Intel Langwell USB OTG transceiver driver"
+#define DRIVER_VERSION          "3.0.0.32L.0002"
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Henry Yuan <hang.yuan@intel.com>, Hao Wu <hao.wu@intel.com>");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
+
+static const char driver_name[] = "langwell_otg";
+
+static int langwell_otg_probe(struct pci_dev *pdev,
+                        const struct pci_device_id *id);
+static void langwell_otg_remove(struct pci_dev *pdev);
+static int langwell_otg_suspend(struct pci_dev *pdev, pm_message_t message);
+static int langwell_otg_resume(struct pci_dev *pdev);
+
+static int langwell_otg_set_host(struct otg_transceiver *otg,
+                                struct usb_bus *host);
+static int langwell_otg_set_peripheral(struct otg_transceiver *otg,
+                                struct usb_gadget *gadget);
+static int langwell_otg_start_srp(struct otg_transceiver *otg);
+
+static const struct pci_device_id pci_ids[] = {{
+        .class =        ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
+        .class_mask =   ~0,
+        .vendor =       0x8086,
+        .device =       0x0811,
+        .subvendor =    PCI_ANY_ID,
+        .subdevice =    PCI_ANY_ID,
+}, { /* end: all zeroes */ }
+};
+
+static struct pci_driver otg_pci_driver = {
+        .name =         (char *) driver_name,
+        .id_table =     pci_ids,
+
+        .probe =        langwell_otg_probe,
+        .remove =       langwell_otg_remove,
+
+        .suspend =      langwell_otg_suspend,
+        .resume =       langwell_otg_resume,
+};
+
+static const char *state_string(enum usb_otg_state state)
+{
+        switch (state) {
+        case OTG_STATE_A_IDLE:
+                return "a_idle";
+        case OTG_STATE_A_WAIT_VRISE:
+                return "a_wait_vrise";
+        case OTG_STATE_A_WAIT_BCON:
+                return "a_wait_bcon";
+        case OTG_STATE_A_HOST:
+                return "a_host";
+        case OTG_STATE_A_SUSPEND:
+                return "a_suspend";
+        case OTG_STATE_A_PERIPHERAL:
+                return "a_peripheral";
+        case OTG_STATE_A_WAIT_VFALL:
+                return "a_wait_vfall";
+        case OTG_STATE_A_VBUS_ERR:
+                return "a_vbus_err";
+        case OTG_STATE_B_IDLE:
+                return "b_idle";
+        case OTG_STATE_B_SRP_INIT:
+                return "b_srp_init";
+        case OTG_STATE_B_PERIPHERAL:
+                return "b_peripheral";
+        case OTG_STATE_B_WAIT_ACON:
+                return "b_wait_acon";
+        case OTG_STATE_B_HOST:
+                return "b_host";
+        default:
+                return "UNDEFINED";
+        }
+}
+
+/* HSM timers */
+static inline struct langwell_otg_timer *otg_timer_initializer
+(void (*function)(unsigned long), unsigned long expires, unsigned long data)
+{
+        struct langwell_otg_timer *timer;
+        timer = kmalloc(sizeof(struct langwell_otg_timer), GFP_KERNEL);
+        timer->function = function;
+        timer->expires = expires;
+        timer->data = data;
+        return timer;
+}
+
+static struct langwell_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr,
+        *a_aidl_bdis_tmr, *b_ase0_brst_tmr, *b_se0_srp_tmr, *b_srp_res_tmr,
+        *b_bus_suspend_tmr;
+
+static struct list_head active_timers;
+
+static struct langwell_otg *the_transceiver;
+
+/* host/client notify transceiver when event affects HNP state */
+void langwell_update_transceiver()
+{
+        otg_dbg("transceiver driver is notified\n");
+        queue_work(the_transceiver->qwork, &the_transceiver->work);
+}
+EXPORT_SYMBOL(langwell_update_transceiver);
+
+static int langwell_otg_set_host(struct otg_transceiver *otg,
+                                        struct usb_bus *host)
+{
+        otg->host = host;
+
+        return 0;
+}
+
+static int langwell_otg_set_peripheral(struct otg_transceiver *otg,
+                                        struct usb_gadget *gadget)
+{
+        otg->gadget = gadget;
+
+        return 0;
+}
+
+static int langwell_otg_set_power(struct otg_transceiver *otg,
+                                unsigned mA)
+{
+        return 0;
+}
+
+/* A-device drives vbus, controlled through PMIC CHRGCNTL register*/
+static void langwell_otg_drv_vbus(int on)
+{
+        struct ipc_pmic_reg_data        pmic_data = {0};
+        struct ipc_pmic_reg_data        battery_data;
+
+        /* Check if battery is attached or not */
+        battery_data.pmic_reg_data[0].register_address = 0xd2;
+        battery_data.ioc = 0;
+        battery_data.num_entries = 1;
+        if (ipc_pmic_register_read(&battery_data)) {
+                otg_dbg("Failed to read PMIC register 0xd2.\n");
+                return;
+        }
+
+        if ((battery_data.pmic_reg_data[0].value & 0x20) == 0) {
+                otg_dbg("no battery attached\n");
+                return;
+        }
+
+        /* Workaround for battery attachment issue */
+        if (battery_data.pmic_reg_data[0].value == 0x34) {
+                otg_dbg("battery \n");
+                return;
+        }
+
+        otg_dbg("battery attached\n");
+
+        pmic_data.ioc = 0;
+        pmic_data.pmic_reg_data[0].register_address = 0xD4;
+        pmic_data.num_entries = 1;
+        if (on)
+                pmic_data.pmic_reg_data[0].value = 0x20;
+        else
+                pmic_data.pmic_reg_data[0].value = 0xc0;
+
+        if (ipc_pmic_register_write(&pmic_data, TRUE))
+                otg_dbg("Failed to write PMIC.\n");
+
+}
+
+/* charge vbus or discharge vbus through a resistor to ground */
+static void langwell_otg_chrg_vbus(int on)
+{
+
+        u32     val;
+
+        val = readl(the_transceiver->regs + CI_OTGSC);
+
+        if (on)
+                writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_VC,
+                                the_transceiver->regs + CI_OTGSC);
+        else
+                writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_VD,
+                                the_transceiver->regs + CI_OTGSC);
+
+}
+
+/* Start SRP */
+static int langwell_otg_start_srp(struct otg_transceiver *otg)
+{
+        u32     val;
+
+        otg_dbg("Start SRP ->\n");
+
+        val = readl(the_transceiver->regs + CI_OTGSC);
+
+        writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HADP,
+                the_transceiver->regs + CI_OTGSC);
+
+        /* Check if the data plus is finished or not */
+        msleep(8);
+        val = readl(the_transceiver->regs + CI_OTGSC);
+        if (val & (OTGSC_HADP | OTGSC_DP))
+                otg_dbg("DataLine SRP Error\n");
+
+        /* FIXME: VBus SRP */
+
+        return 0;
+}
+
+
+/* stop SOF via bus_suspend */
+static void langwell_otg_loc_sof(int on)
+{
+        struct usb_hcd  *hcd;
+        int             err;
+
+        otg_dbg("loc_sof -> %d\n", on);
+
+        hcd = bus_to_hcd(the_transceiver->otg.host);
+        if (on)
+                err = hcd->driver->bus_resume(hcd);
+        else
+                err = hcd->driver->bus_suspend(hcd);
+
+        if (err)
+                otg_dbg("Failed to resume/suspend bus - %d\n", err);
+}
+
+static void langwell_otg_phy_low_power(int on)
+{
+        u32     val;
+
+        otg_dbg("phy low power mode-> %d\n", on);
+
+        val = readl(the_transceiver->regs + CI_HOSTPC1);
+        if (on)
+                writel(val | HOSTPC1_PHCD, the_transceiver->regs + CI_HOSTPC1);
+        else
+                writel(val & ~HOSTPC1_PHCD, the_transceiver->regs + CI_HOSTPC1);
+}
+
+/* Enable/Disable OTG interrupt */
+static void langwell_otg_intr(int on)
+{
+        u32 val;
+
+        otg_dbg("interrupt -> %d\n", on);
+
+        val = readl(the_transceiver->regs + CI_OTGSC);
+        if (on) {
+                val = val | (OTGSC_INTEN_MASK | OTGSC_IDPU);
+                writel(val, the_transceiver->regs + CI_OTGSC);
+        } else {
+                val = val & ~(OTGSC_INTEN_MASK | OTGSC_IDPU);
+                writel(val, the_transceiver->regs + CI_OTGSC);
+        }
+}
+
+/* set HAAR: Hardware Assist Auto-Reset */
+static void langwell_otg_HAAR(int on)
+{
+        u32     val;
+
+        otg_dbg("HAAR -> %d\n", on);
+
+        val = readl(the_transceiver->regs + CI_OTGSC);
+        if (on)
+                writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HAAR,
+                                the_transceiver->regs + CI_OTGSC);
+        else
+                writel((val & ~OTGSC_INTSTS_MASK) & ~OTGSC_HAAR,
+                                the_transceiver->regs + CI_OTGSC);
+}
+
+/* set HABA: Hardware Assist B-Disconnect to A-Connect */
+static void langwell_otg_HABA(int on)
+{
+        u32     val;
+
+        otg_dbg("HABA -> %d\n", on);
+
+        val = readl(the_transceiver->regs + CI_OTGSC);
+        if (on)
+                writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HABA,
+                                the_transceiver->regs + CI_OTGSC);
+        else
+                writel((val & ~OTGSC_INTSTS_MASK) & ~OTGSC_HABA,
+                                the_transceiver->regs + CI_OTGSC);
+}
+
+static int langwell_otg_check_se0_srp(int on)
+{
+        u32 val;
+
+        int delay_time = TB_SE0_SRP * 10; /* step is 100us */
+
+        otg_dbg("check_se0_srp -> \n");
+
+        do {
+                udelay(100);
+                if (!delay_time--)
+                        break;
+                val = readl(the_transceiver->regs + CI_PORTSC1);
+                val &= PORTSC_LS;
+        } while (!val);
+
+        otg_dbg("check_se0_srp <- \n");
+        return val;
+}
+
+/* The timeout callback function to set time out bit */
+static void set_tmout(unsigned long indicator)
+{
+        *(int *)indicator = 1;
+}
+
+void langwell_otg_nsf_msg(unsigned long indicator)
+{
+        switch (indicator) {
+        case 2:
+        case 4:
+        case 6:
+        case 7:
+                printk(KERN_ERR "OTG:NSF-%lu - deivce not responding\n",
+                                indicator);
+                break;
+        case 3:
+                printk(KERN_ERR "OTG:NSF-%lu - deivce not supported\n",
+                                indicator);
+                break;
+        default:
+                printk(KERN_ERR "Do not have this kind of NSF\n");
+                break;
+        }
+}
+
+/* Initialize timers */
+static void langwell_otg_init_timers(struct otg_hsm *hsm)
+{
+        /* HSM used timers */
+        a_wait_vrise_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_VRISE,
+                                (unsigned long)&hsm->a_wait_vrise_tmout);
+        a_wait_bcon_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_BCON,
+                                (unsigned long)&hsm->a_wait_bcon_tmout);
+        a_aidl_bdis_tmr = otg_timer_initializer(&set_tmout, TA_AIDL_BDIS,
+                                (unsigned long)&hsm->a_aidl_bdis_tmout);
+        b_ase0_brst_tmr = otg_timer_initializer(&set_tmout, TB_ASE0_BRST,
+                                (unsigned long)&hsm->b_ase0_brst_tmout);
+        b_se0_srp_tmr = otg_timer_initializer(&set_tmout, TB_SE0_SRP,
+                                (unsigned long)&hsm->b_se0_srp);
+        b_srp_res_tmr = otg_timer_initializer(&set_tmout, TB_SRP_RES,
+                                (unsigned long)&hsm->b_srp_res_tmout);
+        b_bus_suspend_tmr = otg_timer_initializer(&set_tmout, TB_BUS_SUSPEND,
+                                (unsigned long)&hsm->b_bus_suspend_tmout);
+}
+
+/* Free timers */
+static void langwell_otg_free_timers(void)
+{
+        kfree(a_wait_vrise_tmr);
+        kfree(a_wait_bcon_tmr);
+        kfree(a_aidl_bdis_tmr);
+        kfree(b_ase0_brst_tmr);
+        kfree(b_se0_srp_tmr);
+        kfree(b_srp_res_tmr);
+        kfree(b_bus_suspend_tmr);
+}
+
+/* Add timer to timer list */
+static void langwell_otg_add_timer(void *gtimer)
+{
+        struct langwell_otg_timer *timer = (struct langwell_otg_timer *)gtimer;
+        struct langwell_otg_timer *tmp_timer;
+        u32     val32;
+
+        /* Check if the timer is already in the active list,
+         * if so update timer count
+         */
+        list_for_each_entry(tmp_timer, &active_timers, list)
+                if (tmp_timer == timer) {
+                        timer->count = timer->expires;
+                        return;
+                }
+        timer->count = timer->expires;
+
+        if (list_empty(&active_timers)) {
+                val32 = readl(the_transceiver->regs + CI_OTGSC);
+                writel(val32 | OTGSC_1MSE, the_transceiver->regs + CI_OTGSC);
+        }
+
+        list_add_tail(&timer->list, &active_timers);
+}
+
+/* Remove timer from the timer list; clear timeout status */
+static void langwell_otg_del_timer(void *gtimer)
+{
+        struct langwell_otg_timer *timer = (struct langwell_otg_timer *)gtimer;
+        struct langwell_otg_timer *tmp_timer, *del_tmp;
+        u32 val32;
+
+        list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list)
+                if (tmp_timer == timer)
+                        list_del(&timer->list);
+
+        if (list_empty(&active_timers)) {
+                val32 = readl(the_transceiver->regs + CI_OTGSC);
+                writel(val32 & ~OTGSC_1MSE, the_transceiver->regs + CI_OTGSC);
+        }
+}
+
+/* Reduce timer count by 1, and find timeout conditions.*/
+static int langwell_otg_tick_timer(u32 *int_sts)
+{
+        struct langwell_otg_timer *tmp_timer, *del_tmp;
+        int expired = 0;
+
+        list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list) {
+                tmp_timer->count--;
+                /* check if timer expires */
+                if (!tmp_timer->count) {
+                        list_del(&tmp_timer->list);
+                        tmp_timer->function(tmp_timer->data);
+                        expired = 1;
+                }
+        }
+
+        if (list_empty(&active_timers)) {
+                otg_dbg("tick timer: disable 1ms int\n");
+                *int_sts = *int_sts & ~OTGSC_1MSE;
+        }
+        return expired;
+}
+
+static void reset_otg(void)
+{
+        u32     val;
+        int     delay_time = 1000;
+
+        otg_dbg("reseting OTG controller ...\n");
+        val = readl(the_transceiver->regs + CI_USBCMD);
+        writel(val | USBCMD_RST, the_transceiver->regs + CI_USBCMD);
+        do {
+                udelay(100);
+                if (!delay_time--)
+                        otg_dbg("reset timeout\n");
+                val = readl(the_transceiver->regs + CI_USBCMD);
+                val &= USBCMD_RST;
+        } while (val != 0);
+        otg_dbg("reset done.\n");
+}
+
+static void set_host_mode(void)
+{
+        u32     val;
+
+        reset_otg();
+        val = readl(the_transceiver->regs + CI_USBMODE);
+        val = (val & (~USBMODE_CM)) | USBMODE_HOST;
+        writel(val, the_transceiver->regs + CI_USBMODE);
+}
+
+static void set_client_mode(void)
+{
+        u32     val;
+
+        reset_otg();
+        val = readl(the_transceiver->regs + CI_USBMODE);
+        val = (val & (~USBMODE_CM)) | USBMODE_DEVICE;
+        writel(val, the_transceiver->regs + CI_USBMODE);
+}
+
+static void init_hsm(void)
+{
+        struct langwell_otg     *langwell = the_transceiver;
+        u32                     val32;
+
+        /* read OTGSC after reset */
+        val32 = readl(langwell->regs + CI_OTGSC);
+        otg_dbg("%s: OTGSC init value = 0x%x\n", __func__, val32);
+
+        /* set init state */
+        if (val32 & OTGSC_ID) {
+                langwell->hsm.id = 1;
+                langwell->otg.default_a = 0;
+                set_client_mode();
+                langwell->otg.state = OTG_STATE_B_IDLE;
+                langwell_otg_drv_vbus(0);
+        } else {
+                langwell->hsm.id = 0;
+                langwell->otg.default_a = 1;
+                set_host_mode();
+                langwell->otg.state = OTG_STATE_A_IDLE;
+        }
+
+        /* set session indicator */
+        if (val32 & OTGSC_BSE)
+                langwell->hsm.b_sess_end = 1;
+        if (val32 & OTGSC_BSV)
+                langwell->hsm.b_sess_vld = 1;
+        if (val32 & OTGSC_ASV)
+                langwell->hsm.a_sess_vld = 1;
+        if (val32 & OTGSC_AVV)
+                langwell->hsm.a_vbus_vld = 1;
+
+        /* defautly power the bus */
+        langwell->hsm.a_bus_req = 1;
+        langwell->hsm.a_bus_drop = 0;
+        /* defautly don't request bus as B device */
+        langwell->hsm.b_bus_req = 0;
+        /* no system error */
+        langwell->hsm.a_clr_err = 0;
+}
+
+static irqreturn_t otg_dummy_irq(int irq, void *_dev)
+{
+        void __iomem    *reg_base = _dev;
+        u32     val;
+        u32     int_mask = 0;
+
+        val = readl(reg_base + CI_USBMODE);
+        if ((val & USBMODE_CM) != USBMODE_DEVICE)
+                return IRQ_NONE;
+
+        val = readl(reg_base + CI_USBSTS);
+        int_mask = val & INTR_DUMMY_MASK;
+
+        if (int_mask == 0)
+                return IRQ_NONE;
+
+        /* clear hsm.b_conn here since host driver can't detect it
+        *  otg_dummy_irq called means B-disconnect happened.
+        */
+        if (the_transceiver->hsm.b_conn) {
+                the_transceiver->hsm.b_conn = 0;
+                if (spin_trylock(&the_transceiver->wq_lock)) {
+                        queue_work(the_transceiver->qwork,
+                                &the_transceiver->work);
+                        spin_unlock(&the_transceiver->wq_lock);
+                }
+        }
+        /* Clear interrupts */
+        writel(int_mask, reg_base + CI_USBSTS);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t otg_irq(int irq, void *_dev)
+{
+        struct  langwell_otg *langwell = _dev;
+        u32     int_sts, int_en;
+        u32     int_mask = 0;
+        int     flag = 0;
+
+        int_sts = readl(langwell->regs + CI_OTGSC);
+        int_en = (int_sts & OTGSC_INTEN_MASK) >> 8;
+        int_mask = int_sts & int_en;
+        if (int_mask == 0)
+                return IRQ_NONE;
+
+        if (int_mask & OTGSC_IDIS) {
+                otg_dbg("%s: id change int\n", __func__);
+                langwell->hsm.id = (int_sts & OTGSC_ID) ? 1 : 0;
+                flag = 1;
+        }
+        if (int_mask & OTGSC_DPIS) {
+                otg_dbg("%s: data pulse int\n", __func__);
+                langwell->hsm.a_srp_det = (int_sts & OTGSC_DPS) ? 1 : 0;
+                flag = 1;
+        }
+        if (int_mask & OTGSC_BSEIS) {
+                otg_dbg("%s: b session end int\n", __func__);
+                langwell->hsm.b_sess_end = (int_sts & OTGSC_BSE) ? 1 : 0;
+                flag = 1;
+        }
+        if (int_mask & OTGSC_BSVIS) {
+                otg_dbg("%s: b session valid int\n", __func__);
+                langwell->hsm.b_sess_vld = (int_sts & OTGSC_BSV) ? 1 : 0;
+                flag = 1;
+        }
+        if (int_mask & OTGSC_ASVIS) {
+                otg_dbg("%s: a session valid int\n", __func__);
+                langwell->hsm.a_sess_vld = (int_sts & OTGSC_ASV) ? 1 : 0;
+                flag = 1;
+        }
+        if (int_mask & OTGSC_AVVIS) {
+                otg_dbg("%s: a vbus valid int\n", __func__);
+                langwell->hsm.a_vbus_vld = (int_sts & OTGSC_AVV) ? 1 : 0;
+                flag = 1;
+        }
+
+        if (int_mask & OTGSC_1MSS) {
+                /* need to schedule otg_work if any timer is expired */
+                if (langwell_otg_tick_timer(&int_sts))
+                        flag = 1;
+        }
+
+        writel((int_sts & ~OTGSC_INTSTS_MASK) | int_mask,
+                        langwell->regs + CI_OTGSC);
+        if (flag)
+                queue_work(langwell->qwork, &langwell->work);
+
+        return IRQ_HANDLED;
+}
+
+static void langwell_otg_work(struct work_struct *work)
+{
+        struct langwell_otg *langwell = container_of(work,
+                                        struct langwell_otg, work);
+        int     retval;
+
+        otg_dbg("%s: old state = %s\n", __func__,
+                        state_string(langwell->otg.state));
+
+        switch (langwell->otg.state) {
+        case OTG_STATE_UNDEFINED:
+        case OTG_STATE_B_IDLE:
+                if (!langwell->hsm.id) {
+                        langwell_otg_del_timer(b_srp_res_tmr);
+                        langwell->otg.default_a = 1;
+                        langwell->hsm.a_srp_det = 0;
+
+                        langwell_otg_chrg_vbus(0);
+                        langwell_otg_drv_vbus(0);
+
+                        set_host_mode();
+                        langwell->otg.state = OTG_STATE_A_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (langwell->hsm.b_srp_res_tmout) {
+                        langwell->hsm.b_srp_res_tmout = 0;
+                        langwell->hsm.b_bus_req = 0;
+                        langwell_otg_nsf_msg(6);
+                } else if (langwell->hsm.b_sess_vld) {
+                        langwell_otg_del_timer(b_srp_res_tmr);
+                        langwell->hsm.b_sess_end = 0;
+                        langwell->hsm.a_bus_suspend = 0;
+
+                        langwell_otg_chrg_vbus(0);
+                        if (langwell->client_ops) {
+                                langwell->client_ops->resume(langwell->pdev);
+                                langwell->otg.state = OTG_STATE_B_PERIPHERAL;
+                        } else
+                                otg_dbg("client driver not loaded.\n");
+
+                } else if (langwell->hsm.b_bus_req &&
+                                (langwell->hsm.b_sess_end)) {
+                        /* workaround for b_se0_srp detection */
+                        retval = langwell_otg_check_se0_srp(0);
+                        if (retval) {
+                                langwell->hsm.b_bus_req = 0;
+                                otg_dbg("LS is not SE0, try again later\n");
+                        } else {
+                                /* Start SRP */
+                                langwell_otg_start_srp(&langwell->otg);
+                                langwell_otg_add_timer(b_srp_res_tmr);
+                        }
+                }
+                break;
+        case OTG_STATE_B_SRP_INIT:
+                if (!langwell->hsm.id) {
+                        langwell->otg.default_a = 1;
+                        langwell->hsm.a_srp_det = 0;
+
+                        langwell_otg_drv_vbus(0);
+                        langwell_otg_chrg_vbus(0);
+
+                        langwell->otg.state = OTG_STATE_A_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (langwell->hsm.b_sess_vld) {
+                        langwell_otg_chrg_vbus(0);
+                        if (langwell->client_ops) {
+                                langwell->client_ops->resume(langwell->pdev);
+                                langwell->otg.state = OTG_STATE_B_PERIPHERAL;
+                        } else
+                                otg_dbg("client driver not loaded.\n");
+                }
+                break;
+        case OTG_STATE_B_PERIPHERAL:
+                if (!langwell->hsm.id) {
+                        langwell->otg.default_a = 1;
+                        langwell->hsm.a_srp_det = 0;
+
+                        langwell_otg_drv_vbus(0);
+                        langwell_otg_chrg_vbus(0);
+                        set_host_mode();
+
+                        if (langwell->client_ops) {
+                                langwell->client_ops->suspend(langwell->pdev,
+                                        PMSG_FREEZE);
+                        } else
+                                otg_dbg("client driver has been removed.\n");
+
+                        langwell->otg.state = OTG_STATE_A_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (!langwell->hsm.b_sess_vld) {
+                        langwell->hsm.b_hnp_enable = 0;
+
+                        if (langwell->client_ops) {
+                                langwell->client_ops->suspend(langwell->pdev,
+                                        PMSG_FREEZE);
+                        } else
+                                otg_dbg("client driver has been removed.\n");
+
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                } else if (langwell->hsm.b_bus_req && langwell->hsm.b_hnp_enable
+                        && langwell->hsm.a_bus_suspend) {
+
+                        if (langwell->client_ops) {
+                                langwell->client_ops->suspend(langwell->pdev,
+                                        PMSG_FREEZE);
+                        } else
+                                otg_dbg("client driver has been removed.\n");
+
+                        langwell_otg_HAAR(1);
+                        langwell->hsm.a_conn = 0;
+
+                        if (langwell->host_ops) {
+                                langwell->host_ops->probe(langwell->pdev,
+                                        langwell->host_ops->id_table);
+                                langwell->otg.state = OTG_STATE_B_WAIT_ACON;
+                        } else
+                                otg_dbg("host driver not loaded.\n");
+
+                        langwell->hsm.a_bus_resume = 0;
+                        langwell->hsm.b_ase0_brst_tmout = 0;
+                        langwell_otg_add_timer(b_ase0_brst_tmr);
+                }
+                break;
+
+        case OTG_STATE_B_WAIT_ACON:
+                if (!langwell->hsm.id) {
+                        langwell_otg_del_timer(b_ase0_brst_tmr);
+                        langwell->otg.default_a = 1;
+                        langwell->hsm.a_srp_det = 0;
+
+                        langwell_otg_drv_vbus(0);
+                        langwell_otg_chrg_vbus(0);
+                        set_host_mode();
+
+                        langwell_otg_HAAR(0);
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell->otg.state = OTG_STATE_A_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (!langwell->hsm.b_sess_vld) {
+                        langwell_otg_del_timer(b_ase0_brst_tmr);
+                        langwell->hsm.b_hnp_enable = 0;
+                        langwell->hsm.b_bus_req = 0;
+                        langwell_otg_chrg_vbus(0);
+                        langwell_otg_HAAR(0);
+
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                } else if (langwell->hsm.a_conn) {
+                        langwell_otg_del_timer(b_ase0_brst_tmr);
+                        langwell_otg_HAAR(0);
+                        langwell->otg.state = OTG_STATE_B_HOST;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (langwell->hsm.a_bus_resume ||
+                                langwell->hsm.b_ase0_brst_tmout) {
+                        langwell_otg_del_timer(b_ase0_brst_tmr);
+                        langwell_otg_HAAR(0);
+                        langwell_otg_nsf_msg(7);
+
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+
+                        langwell->hsm.a_bus_suspend = 0;
+                        langwell->hsm.b_bus_req = 0;
+
+                        if (langwell->client_ops)
+                                langwell->client_ops->resume(langwell->pdev);
+                        else
+                                otg_dbg("client driver not loaded.\n");
+
+                        langwell->otg.state = OTG_STATE_B_PERIPHERAL;
+                }
+                break;
+
+        case OTG_STATE_B_HOST:
+                if (!langwell->hsm.id) {
+                        langwell->otg.default_a = 1;
+                        langwell->hsm.a_srp_det = 0;
+
+                        langwell_otg_drv_vbus(0);
+                        langwell_otg_chrg_vbus(0);
+                        set_host_mode();
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell->otg.state = OTG_STATE_A_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (!langwell->hsm.b_sess_vld) {
+                        langwell->hsm.b_hnp_enable = 0;
+                        langwell->hsm.b_bus_req = 0;
+                        langwell_otg_chrg_vbus(0);
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                } else if ((!langwell->hsm.b_bus_req) ||
+                                (!langwell->hsm.a_conn)) {
+                        langwell->hsm.b_bus_req = 0;
+                        langwell_otg_loc_sof(0);
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+
+                        langwell->hsm.a_bus_suspend = 0;
+
+                        if (langwell->client_ops)
+                                langwell->client_ops->resume(langwell->pdev);
+                        else
+                                otg_dbg("client driver not loaded.\n");
+
+                        langwell->otg.state = OTG_STATE_B_PERIPHERAL;
+                }
+                break;
+
+        case OTG_STATE_A_IDLE:
+                langwell->otg.default_a = 1;
+                if (langwell->hsm.id) {
+                        langwell->otg.default_a = 0;
+                        langwell->hsm.b_bus_req = 0;
+                        langwell_otg_drv_vbus(0);
+                        langwell_otg_chrg_vbus(0);
+
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (langwell->hsm.a_sess_vld) {
+                        langwell_otg_drv_vbus(1);
+                        langwell->hsm.a_srp_det = 1;
+                        langwell->hsm.a_wait_vrise_tmout = 0;
+                        langwell_otg_add_timer(a_wait_vrise_tmr);
+                        langwell->otg.state = OTG_STATE_A_WAIT_VRISE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (!langwell->hsm.a_bus_drop &&
+                        (langwell->hsm.a_srp_det || langwell->hsm.a_bus_req)) {
+                        langwell_otg_drv_vbus(1);
+                        langwell->hsm.a_wait_vrise_tmout = 0;
+                        langwell_otg_add_timer(a_wait_vrise_tmr);
+                        langwell->otg.state = OTG_STATE_A_WAIT_VRISE;
+                        queue_work(langwell->qwork, &langwell->work);
+                }
+                break;
+        case OTG_STATE_A_WAIT_VRISE:
+                if (langwell->hsm.id) {
+                        langwell_otg_del_timer(a_wait_vrise_tmr);
+                        langwell->hsm.b_bus_req = 0;
+                        langwell->otg.default_a = 0;
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                } else if (langwell->hsm.a_vbus_vld) {
+                        langwell_otg_del_timer(a_wait_vrise_tmr);
+                        if (langwell->host_ops)
+                                langwell->host_ops->probe(langwell->pdev,
+                                                langwell->host_ops->id_table);
+                        else
+                                otg_dbg("host driver not loaded.\n");
+                        langwell->hsm.b_conn = 0;
+                        langwell->hsm.a_set_b_hnp_en = 0;
+                        langwell->hsm.a_wait_bcon_tmout = 0;
+                        langwell_otg_add_timer(a_wait_bcon_tmr);
+                        langwell->otg.state = OTG_STATE_A_WAIT_BCON;
+                } else if (langwell->hsm.a_wait_vrise_tmout) {
+                        if (langwell->hsm.a_vbus_vld) {
+                                if (langwell->host_ops)
+                                        langwell->host_ops->probe(
+                                                langwell->pdev,
+                                                langwell->host_ops->id_table);
+                                else
+                                        otg_dbg("host driver not loaded.\n");
+                                langwell->hsm.b_conn = 0;
+                                langwell->hsm.a_set_b_hnp_en = 0;
+                                langwell->hsm.a_wait_bcon_tmout = 0;
+                                langwell_otg_add_timer(a_wait_bcon_tmr);
+                                langwell->otg.state = OTG_STATE_A_WAIT_BCON;
+                        } else {
+                                langwell_otg_drv_vbus(0);
+                                langwell->otg.state = OTG_STATE_A_VBUS_ERR;
+                        }
+                }
+                break;
+        case OTG_STATE_A_WAIT_BCON:
+                if (langwell->hsm.id) {
+                        langwell_otg_del_timer(a_wait_bcon_tmr);
+
+                        langwell->otg.default_a = 0;
+                        langwell->hsm.b_bus_req = 0;
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (!langwell->hsm.a_vbus_vld) {
+                        langwell_otg_del_timer(a_wait_bcon_tmr);
+
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_A_VBUS_ERR;
+                } else if (langwell->hsm.a_bus_drop ||
+                                (langwell->hsm.a_wait_bcon_tmout &&
+                                !langwell->hsm.a_bus_req)) {
+                        langwell_otg_del_timer(a_wait_bcon_tmr);
+
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
+                } else if (langwell->hsm.b_conn) {
+                        langwell_otg_del_timer(a_wait_bcon_tmr);
+
+                        langwell->hsm.a_suspend_req = 0;
+                        langwell->otg.state = OTG_STATE_A_HOST;
+                        if (!langwell->hsm.a_bus_req &&
+                                langwell->hsm.a_set_b_hnp_en) {
+                                /* It is not safe enough to do a fast
+                                 * transistion from A_WAIT_BCON to
+                                 * A_SUSPEND */
+                                msleep(10000);
+                                if (langwell->hsm.a_bus_req)
+                                        break;
+
+                                if (request_irq(langwell->pdev->irq,
+                                        otg_dummy_irq, IRQF_SHARED,
+                                        driver_name, langwell->regs) != 0) {
+                                        otg_dbg("request interrupt %d fail\n",
+                                        langwell->pdev->irq);
+                                }
+
+                                langwell_otg_HABA(1);
+                                langwell->hsm.b_bus_resume = 0;
+                                langwell->hsm.a_aidl_bdis_tmout = 0;
+                                langwell_otg_add_timer(a_aidl_bdis_tmr);
+
+                                langwell_otg_loc_sof(0);
+                                langwell->otg.state = OTG_STATE_A_SUSPEND;
+                        } else if (!langwell->hsm.a_bus_req &&
+                                !langwell->hsm.a_set_b_hnp_en) {
+                                struct pci_dev *pdev = langwell->pdev;
+                                if (langwell->host_ops)
+                                        langwell->host_ops->remove(pdev);
+                                else
+                                        otg_dbg("host driver removed.\n");
+                                langwell_otg_drv_vbus(0);
+                                langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
+                        }
+                }
+                break;
+        case OTG_STATE_A_HOST:
+                if (langwell->hsm.id) {
+                        langwell->otg.default_a = 0;
+                        langwell->hsm.b_bus_req = 0;
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (langwell->hsm.a_bus_drop ||
+                (!langwell->hsm.a_set_b_hnp_en && !langwell->hsm.a_bus_req)) {
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
+                } else if (!langwell->hsm.a_vbus_vld) {
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_A_VBUS_ERR;
+                } else if (langwell->hsm.a_set_b_hnp_en
+                                && !langwell->hsm.a_bus_req) {
+                        /* Set HABA to enable hardware assistance to signal
+                         *  A-connect after receiver B-disconnect. Hardware
+                         *  will then set client mode and enable URE, SLE and
+                         *  PCE after the assistance. otg_dummy_irq is used to
+                         *  clean these ints when client driver is not resumed.
+                         */
+                        if (request_irq(langwell->pdev->irq,
+                                otg_dummy_irq, IRQF_SHARED, driver_name,
+                                langwell->regs) != 0) {
+                                otg_dbg("request interrupt %d failed\n",
+                                                langwell->pdev->irq);
+                        }
+
+                        /* set HABA */
+                        langwell_otg_HABA(1);
+                        langwell->hsm.b_bus_resume = 0;
+                        langwell->hsm.a_aidl_bdis_tmout = 0;
+                        langwell_otg_add_timer(a_aidl_bdis_tmr);
+                        langwell_otg_loc_sof(0);
+                        langwell->otg.state = OTG_STATE_A_SUSPEND;
+                } else if (!langwell->hsm.b_conn || !langwell->hsm.a_bus_req) {
+                        langwell->hsm.a_wait_bcon_tmout = 0;
+                        langwell->hsm.a_set_b_hnp_en = 0;
+                        langwell_otg_add_timer(a_wait_bcon_tmr);
+                        langwell->otg.state = OTG_STATE_A_WAIT_BCON;
+                }
+                break;
+        case OTG_STATE_A_SUSPEND:
+                if (langwell->hsm.id) {
+                        langwell_otg_del_timer(a_aidl_bdis_tmr);
+                        langwell_otg_HABA(0);
+                        free_irq(langwell->pdev->irq, langwell->regs);
+                        langwell->otg.default_a = 0;
+                        langwell->hsm.b_bus_req = 0;
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (langwell->hsm.a_bus_req ||
+                                langwell->hsm.b_bus_resume) {
+                        langwell_otg_del_timer(a_aidl_bdis_tmr);
+                        langwell_otg_HABA(0);
+                        free_irq(langwell->pdev->irq, langwell->regs);
+                        langwell->hsm.a_suspend_req = 0;
+                        langwell_otg_loc_sof(1);
+                        langwell->otg.state = OTG_STATE_A_HOST;
+                } else if (langwell->hsm.a_aidl_bdis_tmout ||
+                                langwell->hsm.a_bus_drop) {
+                        langwell_otg_del_timer(a_aidl_bdis_tmr);
+                        langwell_otg_HABA(0);
+                        free_irq(langwell->pdev->irq, langwell->regs);
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
+                } else if (!langwell->hsm.b_conn &&
+                                langwell->hsm.a_set_b_hnp_en) {
+                        langwell_otg_del_timer(a_aidl_bdis_tmr);
+                        langwell_otg_HABA(0);
+                        free_irq(langwell->pdev->irq, langwell->regs);
+
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+
+                        langwell->hsm.b_bus_suspend = 0;
+                        langwell->hsm.b_bus_suspend_vld = 0;
+                        langwell->hsm.b_bus_suspend_tmout = 0;
+
+                        /* msleep(200); */
+                        if (langwell->client_ops)
+                                langwell->client_ops->resume(langwell->pdev);
+                        else
+                                otg_dbg("client driver not loaded.\n");
+
+                        langwell_otg_add_timer(b_bus_suspend_tmr);
+                        langwell->otg.state = OTG_STATE_A_PERIPHERAL;
+                        break;
+                } else if (!langwell->hsm.a_vbus_vld) {
+                        langwell_otg_del_timer(a_aidl_bdis_tmr);
+                        langwell_otg_HABA(0);
+                        free_irq(langwell->pdev->irq, langwell->regs);
+                        if (langwell->host_ops)
+                                langwell->host_ops->remove(langwell->pdev);
+                        else
+                                otg_dbg("host driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_A_VBUS_ERR;
+                }
+                break;
+        case OTG_STATE_A_PERIPHERAL:
+                if (langwell->hsm.id) {
+                        langwell_otg_del_timer(b_bus_suspend_tmr);
+                        langwell->otg.default_a = 0;
+                        langwell->hsm.b_bus_req = 0;
+                        if (langwell->client_ops)
+                                langwell->client_ops->suspend(langwell->pdev,
+                                        PMSG_FREEZE);
+                        else
+                                otg_dbg("client driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (!langwell->hsm.a_vbus_vld) {
+                        langwell_otg_del_timer(b_bus_suspend_tmr);
+                        if (langwell->client_ops)
+                                langwell->client_ops->suspend(langwell->pdev,
+                                        PMSG_FREEZE);
+                        else
+                                otg_dbg("client driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_A_VBUS_ERR;
+                } else if (langwell->hsm.a_bus_drop) {
+                        langwell_otg_del_timer(b_bus_suspend_tmr);
+                        if (langwell->client_ops)
+                                langwell->client_ops->suspend(langwell->pdev,
+                                        PMSG_FREEZE);
+                        else
+                                otg_dbg("client driver has been removed.\n");
+                        langwell_otg_drv_vbus(0);
+                        langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
+                } else if (langwell->hsm.b_bus_suspend) {
+                        langwell_otg_del_timer(b_bus_suspend_tmr);
+                        if (langwell->client_ops)
+                                langwell->client_ops->suspend(langwell->pdev,
+                                        PMSG_FREEZE);
+                        else
+                                otg_dbg("client driver has been removed.\n");
+
+                        if (langwell->host_ops)
+                                langwell->host_ops->probe(langwell->pdev,
+                                                langwell->host_ops->id_table);
+                        else
+                                otg_dbg("host driver not loaded.\n");
+                        langwell->hsm.a_set_b_hnp_en = 0;
+                        langwell->hsm.a_wait_bcon_tmout = 0;
+                        langwell_otg_add_timer(a_wait_bcon_tmr);
+                        langwell->otg.state = OTG_STATE_A_WAIT_BCON;
+                } else if (langwell->hsm.b_bus_suspend_tmout) {
+                        u32     val;
+                        val = readl(langwell->regs + CI_PORTSC1);
+                        if (!(val & PORTSC_SUSP))
+                                break;
+                        if (langwell->client_ops)
+                                langwell->client_ops->suspend(langwell->pdev,
+                                                PMSG_FREEZE);
+                        else
+                                otg_dbg("client driver has been removed.\n");
+                        if (langwell->host_ops)
+                                langwell->host_ops->probe(langwell->pdev,
+                                                langwell->host_ops->id_table);
+                        else
+                                otg_dbg("host driver not loaded.\n");
+                        langwell->hsm.a_set_b_hnp_en = 0;
+                        langwell->hsm.a_wait_bcon_tmout = 0;
+                        langwell_otg_add_timer(a_wait_bcon_tmr);
+                        langwell->otg.state = OTG_STATE_A_WAIT_BCON;
+                }
+                break;
+        case OTG_STATE_A_VBUS_ERR:
+                if (langwell->hsm.id) {
+                        langwell->otg.default_a = 0;
+                        langwell->hsm.a_clr_err = 0;
+                        langwell->hsm.a_srp_det = 0;
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (langwell->hsm.a_clr_err) {
+                        langwell->hsm.a_clr_err = 0;
+                        langwell->hsm.a_srp_det = 0;
+                        reset_otg();
+                        init_hsm();
+                        if (langwell->otg.state == OTG_STATE_A_IDLE)
+                                queue_work(langwell->qwork, &langwell->work);
+                }
+                break;
+        case OTG_STATE_A_WAIT_VFALL:
+                if (langwell->hsm.id) {
+                        langwell->otg.default_a = 0;
+                        langwell->otg.state = OTG_STATE_B_IDLE;
+                        queue_work(langwell->qwork, &langwell->work);
+                } else if (langwell->hsm.a_bus_req) {
+                        langwell_otg_drv_vbus(1);
+                        langwell->hsm.a_wait_vrise_tmout = 0;
+                        langwell_otg_add_timer(a_wait_vrise_tmr);
+                        langwell->otg.state = OTG_STATE_A_WAIT_VRISE;
+                } else if (!langwell->hsm.a_sess_vld) {
+                        langwell->hsm.a_srp_det = 0;
+                        langwell_otg_drv_vbus(0);
+                        set_host_mode();
+                        langwell->otg.state = OTG_STATE_A_IDLE;
+                }
+                break;
+        default:
+                ;
+        }
+
+        otg_dbg("%s: new state = %s\n", __func__,
+                        state_string(langwell->otg.state));
+}
+
+        static ssize_t
+show_registers(struct device *_dev, struct device_attribute *attr, char *buf)
+{
+        struct langwell_otg *langwell;
+        char *next;
+        unsigned size;
+        unsigned t;
+
+        langwell = the_transceiver;
+        next = buf;
+        size = PAGE_SIZE;
+
+        t = scnprintf(next, size,
+                "\n"
+                "USBCMD = 0x%08x \n"
+                "USBSTS = 0x%08x \n"
+                "USBINTR = 0x%08x \n"
+                "ASYNCLISTADDR = 0x%08x \n"
+                "PORTSC1 = 0x%08x \n"
+                "HOSTPC1 = 0x%08x \n"
+                "OTGSC = 0x%08x \n"
+                "USBMODE = 0x%08x \n",
+                readl(langwell->regs + 0x30),
+                readl(langwell->regs + 0x34),
+                readl(langwell->regs + 0x38),
+                readl(langwell->regs + 0x48),
+                readl(langwell->regs + 0x74),
+                readl(langwell->regs + 0xb4),
+                readl(langwell->regs + 0xf4),
+                readl(langwell->regs + 0xf8)
+                );
+        size -= t;
+        next += t;
+
+        return PAGE_SIZE - size;
+}
+static DEVICE_ATTR(registers, S_IRUGO, show_registers, NULL);
+
+static ssize_t
+show_hsm(struct device *_dev, struct device_attribute *attr, char *buf)
+{
+        struct langwell_otg *langwell;
+        char *next;
+        unsigned size;
+        unsigned t;
+
+        langwell = the_transceiver;
+        next = buf;
+        size = PAGE_SIZE;
+
+        t = scnprintf(next, size,
+                "\n"
+                "current state = %s\n"
+                "a_bus_resume = \t%d\n"
+                "a_bus_suspend = \t%d\n"
+                "a_conn = \t%d\n"
+                "a_sess_vld = \t%d\n"
+                "a_srp_det = \t%d\n"
+                "a_vbus_vld = \t%d\n"
+                "b_bus_resume = \t%d\n"
+                "b_bus_suspend = \t%d\n"
+                "b_conn = \t%d\n"
+                "b_se0_srp = \t%d\n"
+                "b_sess_end = \t%d\n"
+                "b_sess_vld = \t%d\n"
+                "id = \t%d\n"
+                "a_set_b_hnp_en = \t%d\n"
+                "b_srp_done = \t%d\n"
+                "b_hnp_enable = \t%d\n"
+                "a_wait_vrise_tmout = \t%d\n"
+                "a_wait_bcon_tmout = \t%d\n"
+                "a_aidl_bdis_tmout = \t%d\n"
+                "b_ase0_brst_tmout = \t%d\n"
+                "a_bus_drop = \t%d\n"
+                "a_bus_req = \t%d\n"
+                "a_clr_err = \t%d\n"
+                "a_suspend_req = \t%d\n"
+                "b_bus_req = \t%d\n"
+                "b_bus_suspend_tmout = \t%d\n"
+                "b_bus_suspend_vld = \t%d\n",
+                state_string(langwell->otg.state),
+                langwell->hsm.a_bus_resume,
+                langwell->hsm.a_bus_suspend,
+                langwell->hsm.a_conn,
+                langwell->hsm.a_sess_vld,
+                langwell->hsm.a_srp_det,
+                langwell->hsm.a_vbus_vld,
+                langwell->hsm.b_bus_resume,
+                langwell->hsm.b_bus_suspend,
+                langwell->hsm.b_conn,
+                langwell->hsm.b_se0_srp,
+                langwell->hsm.b_sess_end,
+                langwell->hsm.b_sess_vld,
+                langwell->hsm.id,
+                langwell->hsm.a_set_b_hnp_en,
+                langwell->hsm.b_srp_done,
+                langwell->hsm.b_hnp_enable,
+                langwell->hsm.a_wait_vrise_tmout,
+                langwell->hsm.a_wait_bcon_tmout,
+                langwell->hsm.a_aidl_bdis_tmout,
+                langwell->hsm.b_ase0_brst_tmout,
+                langwell->hsm.a_bus_drop,
+                langwell->hsm.a_bus_req,
+                langwell->hsm.a_clr_err,
+                langwell->hsm.a_suspend_req,
+                langwell->hsm.b_bus_req,
+                langwell->hsm.b_bus_suspend_tmout,
+                langwell->hsm.b_bus_suspend_vld
+                );
+        size -= t;
+        next += t;
+
+        return PAGE_SIZE - size;
+}
+static DEVICE_ATTR(hsm, S_IRUGO, show_hsm, NULL);
+
+static ssize_t
+get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct langwell_otg *langwell;
+        char *next;
+        unsigned size;
+        unsigned t;
+
+        langwell =  the_transceiver;
+        next = buf;
+        size = PAGE_SIZE;
+
+        t = scnprintf(next, size, "%d", langwell->hsm.a_bus_req);
+        size -= t;
+        next += t;
+
+        return PAGE_SIZE - size;
+}
+
+static ssize_t
+set_a_bus_req(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct langwell_otg *langwell;
+        langwell = the_transceiver;
+        if (!langwell->otg.default_a)
+                return -1;
+        if (count > 2)
+                return -1;
+
+        if (buf[0] == '0') {
+                langwell->hsm.a_bus_req = 0;
+                otg_dbg("a_bus_req = 0\n");
+        } else if (buf[0] == '1') {
+                /* If a_bus_drop is TRUE, a_bus_req can't be set */
+                if (langwell->hsm.a_bus_drop)
+                        return -1;
+                langwell->hsm.a_bus_req = 1;
+                otg_dbg("a_bus_req = 1\n");
+        }
+        if (spin_trylock(&langwell->wq_lock)) {
+                queue_work(langwell->qwork, &langwell->work);
+                spin_unlock(&langwell->wq_lock);
+        }
+        return count;
+}
+static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUGO, get_a_bus_req, set_a_bus_req);
+
+static ssize_t
+get_a_bus_drop(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct langwell_otg *langwell;
+        char *next;
+        unsigned size;
+        unsigned t;
+
+        langwell =  the_transceiver;
+        next = buf;
+        size = PAGE_SIZE;
+
+        t = scnprintf(next, size, "%d", langwell->hsm.a_bus_drop);
+        size -= t;
+        next += t;
+
+        return PAGE_SIZE - size;
+}
+
+static ssize_t
+set_a_bus_drop(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct langwell_otg *langwell;
+        langwell = the_transceiver;
+        if (!langwell->otg.default_a)
+                return -1;
+        if (count > 2)
+                return -1;
+
+        if (buf[0] == '0') {
+                langwell->hsm.a_bus_drop = 0;
+                otg_dbg("a_bus_drop = 0\n");
+        } else if (buf[0] == '1') {
+                langwell->hsm.a_bus_drop = 1;
+                langwell->hsm.a_bus_req = 0;
+                otg_dbg("a_bus_drop = 1, then a_bus_req = 0\n");
+        }
+        if (spin_trylock(&langwell->wq_lock)) {
+                queue_work(langwell->qwork, &langwell->work);
+                spin_unlock(&langwell->wq_lock);
+        }
+        return count;
+}
+static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUGO,
+        get_a_bus_drop, set_a_bus_drop);
+
+static ssize_t
+get_b_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct langwell_otg *langwell;
+        char *next;
+        unsigned size;
+        unsigned t;
+
+        langwell =  the_transceiver;
+        next = buf;
+        size = PAGE_SIZE;
+
+        t = scnprintf(next, size, "%d", langwell->hsm.b_bus_req);
+        size -= t;
+        next += t;
+
+        return PAGE_SIZE - size;
+}
+
+static ssize_t
+set_b_bus_req(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct langwell_otg *langwell;
+        langwell = the_transceiver;
+
+        if (langwell->otg.default_a)
+                return -1;
+
+        if (count > 2)
+                return -1;
+
+        if (buf[0] == '0') {
+                langwell->hsm.b_bus_req = 0;
+                otg_dbg("b_bus_req = 0\n");
+        } else if (buf[0] == '1') {
+                langwell->hsm.b_bus_req = 1;
+                otg_dbg("b_bus_req = 1\n");
+        }
+        if (spin_trylock(&langwell->wq_lock)) {
+                queue_work(langwell->qwork, &langwell->work);
+                spin_unlock(&langwell->wq_lock);
+        }
+        return count;
+}
+static DEVICE_ATTR(b_bus_req, S_IRUGO | S_IWUGO, get_b_bus_req, set_b_bus_req);
+
+static ssize_t
+set_a_clr_err(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct langwell_otg *langwell;
+        langwell = the_transceiver;
+
+        if (!langwell->otg.default_a)
+                return -1;
+        if (count > 2)
+                return -1;
+
+        if (buf[0] == '1') {
+                langwell->hsm.a_clr_err = 1;
+                otg_dbg("a_clr_err = 1\n");
+        }
+        if (spin_trylock(&langwell->wq_lock)) {
+                queue_work(langwell->qwork, &langwell->work);
+                spin_unlock(&langwell->wq_lock);
+        }
+        return count;
+}
+static DEVICE_ATTR(a_clr_err, S_IWUGO, NULL, set_a_clr_err);
+
+static struct attribute *inputs_attrs[] = {
+        &dev_attr_a_bus_req.attr,
+        &dev_attr_a_bus_drop.attr,
+        &dev_attr_b_bus_req.attr,
+        &dev_attr_a_clr_err.attr,
+        NULL,
+};
+
+static struct attribute_group debug_dev_attr_group = {
+        .name = "inputs",
+        .attrs = inputs_attrs,
+};
+
+int langwell_register_host(struct pci_driver *host_driver)
+{
+        int     ret = 0;
+
+        the_transceiver->host_ops = host_driver;
+        queue_work(the_transceiver->qwork, &the_transceiver->work);
+        otg_dbg("host controller driver is registered\n");
+
+        return ret;
+}
+EXPORT_SYMBOL(langwell_register_host);
+
+void langwell_unregister_host(struct pci_driver *host_driver)
+{
+        if (the_transceiver->host_ops)
+                the_transceiver->host_ops->remove(the_transceiver->pdev);
+        the_transceiver->host_ops = NULL;
+        the_transceiver->hsm.a_bus_drop = 1;
+        queue_work(the_transceiver->qwork, &the_transceiver->work);
+        otg_dbg("host controller driver is unregistered\n");
+}
+EXPORT_SYMBOL(langwell_unregister_host);
+
+int langwell_register_peripheral(struct pci_driver *client_driver)
+{
+        int     ret = 0;
+
+        if (client_driver)
+                ret = client_driver->probe(the_transceiver->pdev,
+                                client_driver->id_table);
+        if (!ret) {
+                the_transceiver->client_ops = client_driver;
+                queue_work(the_transceiver->qwork, &the_transceiver->work);
+                otg_dbg("client controller driver is registered\n");
+        }
+
+        return ret;
+}
+EXPORT_SYMBOL(langwell_register_peripheral);
+
+void langwell_unregister_peripheral(struct pci_driver *client_driver)
+{
+        if (the_transceiver->client_ops)
+                the_transceiver->client_ops->remove(the_transceiver->pdev);
+        the_transceiver->client_ops = NULL;
+        the_transceiver->hsm.b_bus_req = 0;
+        queue_work(the_transceiver->qwork, &the_transceiver->work);
+        otg_dbg("client controller driver is unregistered\n");
+}
+EXPORT_SYMBOL(langwell_unregister_peripheral);
+
+static int langwell_otg_probe(struct pci_dev *pdev,
+                const struct pci_device_id *id)
+{
+        unsigned long           resource, len;
+        void __iomem            *base = NULL;
+        int                     retval;
+        u32                     val32;
+        struct langwell_otg     *langwell;
+        char                    qname[] = "langwell_otg_queue";
+
+        retval = 0;
+        otg_dbg("\notg controller is detected.\n");
+        if (pci_enable_device(pdev) < 0) {
+                retval = -ENODEV;
+                goto done;
+        }
+
+        langwell = kzalloc(sizeof *langwell, GFP_KERNEL);
+        if (langwell == NULL) {
+                retval = -ENOMEM;
+                goto done;
+        }
+        the_transceiver = langwell;
+
+        /* control register: BAR 0 */
+        resource = pci_resource_start(pdev, 0);
+        len = pci_resource_len(pdev, 0);
+        if (!request_mem_region(resource, len, driver_name)) {
+                retval = -EBUSY;
+                goto err;
+        }
+        langwell->region = 1;
+
+        base = ioremap_nocache(resource, len);
+        if (base == NULL) {
+                retval = -EFAULT;
+                goto err;
+        }
+        langwell->regs = base;
+
+        if (!pdev->irq) {
+                otg_dbg("No IRQ.\n");
+                retval = -ENODEV;
+                goto err;
+        }
+
+        langwell->qwork = create_workqueue(qname);
+        if (!langwell->qwork) {
+                otg_dbg("cannot create workqueue %s\n", qname);
+                retval = -ENOMEM;
+                goto err;
+        }
+        INIT_WORK(&langwell->work, langwell_otg_work);
+
+        /* OTG common part */
+        langwell->pdev = pdev;
+        langwell->otg.dev = &pdev->dev;
+        langwell->otg.label = driver_name;
+        langwell->otg.set_host = langwell_otg_set_host;
+        langwell->otg.set_peripheral = langwell_otg_set_peripheral;
+        langwell->otg.set_power = langwell_otg_set_power;
+        langwell->otg.start_srp = langwell_otg_start_srp;
+        langwell->otg.state = OTG_STATE_UNDEFINED;
+        if (otg_set_transceiver(&langwell->otg)) {
+                otg_dbg("can't set transceiver\n");
+                retval = -EBUSY;
+                goto err;
+        }
+
+        reset_otg();
+        init_hsm();
+
+        spin_lock_init(&langwell->lock);
+        spin_lock_init(&langwell->wq_lock);
+        INIT_LIST_HEAD(&active_timers);
+        langwell_otg_init_timers(&langwell->hsm);
+
+        if (request_irq(pdev->irq, otg_irq, IRQF_SHARED,
+                                driver_name, langwell) != 0) {
+                otg_dbg("request interrupt %d failed\n", pdev->irq);
+                retval = -EBUSY;
+                goto err;
+        }
+
+        /* enable OTGSC int */
+        val32 = OTGSC_DPIE | OTGSC_BSEIE | OTGSC_BSVIE |
+                OTGSC_ASVIE | OTGSC_AVVIE | OTGSC_IDIE | OTGSC_IDPU;
+        writel(val32, langwell->regs + CI_OTGSC);
+
+        retval = device_create_file(&pdev->dev, &dev_attr_registers);
+        if (retval < 0) {
+                otg_dbg("Can't register sysfs attribute: %d\n", retval);
+                goto err;
+        }
+
+        retval = device_create_file(&pdev->dev, &dev_attr_hsm);
+        if (retval < 0) {
+                otg_dbg("Can't hsm sysfs attribute: %d\n", retval);
+                goto err;
+        }
+
+        retval = sysfs_create_group(&pdev->dev.kobj, &debug_dev_attr_group);
+        if (retval < 0) {
+                otg_dbg("Can't register sysfs attr group: %d\n", retval);
+                goto err;
+        }
+
+        if (langwell->otg.state == OTG_STATE_A_IDLE)
+                queue_work(langwell->qwork, &langwell->work);
+
+        return 0;
+
+err:
+        if (the_transceiver)
+                langwell_otg_remove(pdev);
+done:
+        return retval;
+}
+
+static void langwell_otg_remove(struct pci_dev *pdev)
+{
+        struct langwell_otg *langwell;
+
+        langwell = the_transceiver;
+
+        if (langwell->qwork) {
+                flush_workqueue(langwell->qwork);
+                destroy_workqueue(langwell->qwork);
+        }
+        langwell_otg_free_timers();
+
+        /* disable OTGSC interrupt as OTGSC doesn't change in reset */
+        writel(0, langwell->regs + CI_OTGSC);
+
+        if (pdev->irq)
+                free_irq(pdev->irq, langwell);
+        if (langwell->regs)
+                iounmap(langwell->regs);
+        if (langwell->region)
+                release_mem_region(pci_resource_start(pdev, 0),
+                                pci_resource_len(pdev, 0));
+
+        otg_set_transceiver(NULL);
+        pci_disable_device(pdev);
+        sysfs_remove_group(&pdev->dev.kobj, &debug_dev_attr_group);
+        device_remove_file(&pdev->dev, &dev_attr_hsm);
+        device_remove_file(&pdev->dev, &dev_attr_registers);
+        kfree(langwell);
+        langwell = NULL;
+}
+
+static void transceiver_suspend(struct pci_dev *pdev)
+{
+        pci_save_state(pdev);
+        pci_set_power_state(pdev, PCI_D3hot);
+        langwell_otg_phy_low_power(1);
+}
+
+static int langwell_otg_suspend(struct pci_dev *pdev, pm_message_t message)
+{
+        int     ret = 0;
+        struct langwell_otg *langwell;
+
+        langwell = the_transceiver;
+
+        /* Disbale OTG interrupts */
+        langwell_otg_intr(0);
+
+        if (pdev->irq)
+                free_irq(pdev->irq, langwell);
+
+        /* Prevent more otg_work */
+        flush_workqueue(langwell->qwork);
+        spin_lock(&langwell->wq_lock);
+
+        /* start actions */
+        switch (langwell->otg.state) {
+        case OTG_STATE_A_IDLE:
+        case OTG_STATE_B_IDLE:
+        case OTG_STATE_A_WAIT_VFALL:
+        case OTG_STATE_A_VBUS_ERR:
+                transceiver_suspend(pdev);
+                break;
+        case OTG_STATE_A_WAIT_VRISE:
+                langwell_otg_del_timer(a_wait_vrise_tmr);
+                langwell->hsm.a_srp_det = 0;
+                langwell_otg_drv_vbus(0);
+                langwell->otg.state = OTG_STATE_A_IDLE;
+                transceiver_suspend(pdev);
+                break;
+        case OTG_STATE_A_WAIT_BCON:
+                langwell_otg_del_timer(a_wait_bcon_tmr);
+                if (langwell->host_ops)
+                        ret = langwell->host_ops->suspend(pdev, message);
+                langwell_otg_drv_vbus(0);
+                break;
+        case OTG_STATE_A_HOST:
+                if (langwell->host_ops)
+                        ret = langwell->host_ops->suspend(pdev, message);
+                langwell_otg_drv_vbus(0);
+                langwell_otg_phy_low_power(1);
+                break;
+        case OTG_STATE_A_SUSPEND:
+                langwell_otg_del_timer(a_aidl_bdis_tmr);
+                langwell_otg_HABA(0);
+                if (langwell->host_ops)
+                        langwell->host_ops->remove(pdev);
+                else
+                        otg_dbg("host driver has been removed.\n");
+                langwell_otg_drv_vbus(0);
+                transceiver_suspend(pdev);
+                langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
+                break;
+        case OTG_STATE_A_PERIPHERAL:
+                if (langwell->client_ops)
+                        ret = langwell->client_ops->suspend(pdev, message);
+                else
+                        otg_dbg("client driver has been removed.\n");
+                langwell_otg_drv_vbus(0);
+                transceiver_suspend(pdev);
+                langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
+                break;
+        case OTG_STATE_B_HOST:
+                if (langwell->host_ops)
+                        langwell->host_ops->remove(pdev);
+                else
+                        otg_dbg("host driver has been removed.\n");
+                langwell->hsm.b_bus_req = 0;
+                transceiver_suspend(pdev);
+                langwell->otg.state = OTG_STATE_B_IDLE;
+                break;
+        case OTG_STATE_B_PERIPHERAL:
+                if (langwell->client_ops)
+                        ret = langwell->client_ops->suspend(pdev, message);
+                else
+                        otg_dbg("client driver has been removed.\n");
+                break;
+        case OTG_STATE_B_WAIT_ACON:
+                langwell_otg_del_timer(b_ase0_brst_tmr);
+                langwell_otg_HAAR(0);
+                if (langwell->host_ops)
+                        langwell->host_ops->remove(pdev);
+                else
+                        otg_dbg("host driver has been removed.\n");
+                langwell->hsm.b_bus_req = 0;
+                langwell->otg.state = OTG_STATE_B_IDLE;
+                transceiver_suspend(pdev);
+                break;
+        default:
+                otg_dbg("error state before suspend\n ");
+                break;
+        }
+        spin_unlock(&langwell->wq_lock);
+
+        return ret;
+}
+
+static void transceiver_resume(struct pci_dev *pdev)
+{
+        pci_restore_state(pdev);
+        pci_set_power_state(pdev, PCI_D0);
+        langwell_otg_phy_low_power(0);
+}
+
+static int langwell_otg_resume(struct pci_dev *pdev)
+{
+        int     ret = 0;
+        struct langwell_otg *langwell;
+
+        langwell = the_transceiver;
+
+        spin_lock(&langwell->wq_lock);
+
+        switch (langwell->otg.state) {
+        case OTG_STATE_A_IDLE:
+        case OTG_STATE_B_IDLE:
+        case OTG_STATE_A_WAIT_VFALL:
+        case OTG_STATE_A_VBUS_ERR:
+                transceiver_resume(pdev);
+                break;
+        case OTG_STATE_A_WAIT_BCON:
+                langwell_otg_add_timer(a_wait_bcon_tmr);
+                langwell_otg_drv_vbus(1);
+                if (langwell->host_ops)
+                        ret = langwell->host_ops->resume(pdev);
+                break;
+        case OTG_STATE_A_HOST:
+                langwell_otg_drv_vbus(1);
+                langwell_otg_phy_low_power(0);
+                if (langwell->host_ops)
+                        ret = langwell->host_ops->resume(pdev);
+                break;
+        case OTG_STATE_B_PERIPHERAL:
+                if (langwell->client_ops)
+                        ret = langwell->client_ops->resume(pdev);
+                else
+                        otg_dbg("client driver not loaded.\n");
+                break;
+        default:
+                otg_dbg("error state before suspend\n ");
+                break;
+        }
+
+        if (request_irq(pdev->irq, otg_irq, IRQF_SHARED,
+                                driver_name, the_transceiver) != 0) {
+                otg_dbg("request interrupt %d failed\n", pdev->irq);
+                ret = -EBUSY;
+        }
+
+        /* enable OTG interrupts */
+        langwell_otg_intr(1);
+
+        spin_unlock(&langwell->wq_lock);
+
+        queue_work(langwell->qwork, &langwell->work);
+
+
+        return ret;
+}
+
+static int __init langwell_otg_init(void)
+{
+        return pci_register_driver(&otg_pci_driver);
+}
+module_init(langwell_otg_init);
+
+static void __exit langwell_otg_cleanup(void)
+{
+        pci_unregister_driver(&otg_pci_driver);
+}
+module_exit(langwell_otg_cleanup);
diff --git a/drivers/usb/otg/nop-usb-xceiv.c b/drivers/usb/otg/nop-usb-xceiv.c
index c567168f89af..9ed5ea568679 100644
--- a/drivers/usb/otg/nop-usb-xceiv.c
+++ b/drivers/usb/otg/nop-usb-xceiv.c
@@ -22,8 +22,8 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  * Current status:
- *      this is to add "nop" transceiver for all those phy which is
- *      autonomous such as isp1504 etc.
+ *      This provides a "nop" transceiver for PHYs which are
+ *      autonomous such as isp1504, isp1707, etc.
  */
 
 #include <linux/module.h>
@@ -36,30 +36,25 @@ struct nop_usb_xceiv {
         struct device           *dev;
 };
 
-static u64 nop_xceiv_dmamask = DMA_BIT_MASK(32);
-
-static struct platform_device nop_xceiv_device = {
-        .name           = "nop_usb_xceiv",
-        .id             = -1,
-        .dev = {
-                .dma_mask               = &nop_xceiv_dmamask,
-                .coherent_dma_mask      = DMA_BIT_MASK(32),
-                .platform_data          = NULL,
-        },
-};
+static struct platform_device *pd;
 
 void usb_nop_xceiv_register(void)
 {
-        if (platform_device_register(&nop_xceiv_device) < 0) {
+        if (pd)
+                return;
+        pd = platform_device_register_simple("nop_usb_xceiv", -1, NULL, 0);
+        if (!pd) {
                 printk(KERN_ERR "Unable to register usb nop transceiver\n");
                 return;
         }
 }
+EXPORT_SYMBOL(usb_nop_xceiv_register);
 
 void usb_nop_xceiv_unregister(void)
 {
-        platform_device_unregister(&nop_xceiv_device);
+        platform_device_unregister(pd);
 }
+EXPORT_SYMBOL(usb_nop_xceiv_unregister);
 
 static inline struct nop_usb_xceiv *xceiv_to_nop(struct otg_transceiver *x)
 {
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index d9478d0e1c8b..9e3e7a5c258b 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -217,6 +217,7 @@
 
 /* In module TWL4030_MODULE_PM_MASTER */
 #define PROTECT_KEY                     0x0E
+#define STS_HW_CONDITIONS               0x0F
 
 /* In module TWL4030_MODULE_PM_RECEIVER */
 #define VUSB_DEDICATED1                 0x7D
@@ -351,15 +352,26 @@ static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl)
         int     status;
         int     linkstat = USB_LINK_UNKNOWN;
 
-        /* STS_HW_CONDITIONS */
-        status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER, 0x0f);
+        /*
+         * For ID/VBUS sensing, see manual section 15.4.8 ...
+         * except when using only battery backup power, two
+         * comparators produce VBUS_PRES and ID_PRES signals,
+         * which don't match docs elsewhere.  But ... BIT(7)
+         * and BIT(2) of STS_HW_CONDITIONS, respectively, do
+         * seem to match up.  If either is true the USB_PRES
+         * signal is active, the OTG module is activated, and
+         * its interrupt may be raised (may wake the system).
+         */
+        status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER,
+                        STS_HW_CONDITIONS);
         if (status < 0)
                 dev_err(twl->dev, "USB link status err %d\n", status);
-        else if (status & BIT(7))
-                linkstat = USB_LINK_VBUS;
-        else if (status & BIT(2))
-                linkstat = USB_LINK_ID;
-        else
+        else if (status & (BIT(7) | BIT(2))) {
+                if (status & BIT(2))
+                        linkstat = USB_LINK_ID;
+                else
+                        linkstat = USB_LINK_VBUS;
+        } else
                 linkstat = USB_LINK_NONE;
 
         dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
@@ -641,7 +653,7 @@ static int twl4030_set_host(struct otg_transceiver *x, struct usb_bus *host)
         return 0;
 }
 
-static int __init twl4030_usb_probe(struct platform_device *pdev)
+static int __devinit twl4030_usb_probe(struct platform_device *pdev)
 {
         struct twl4030_usb_data *pdata = pdev->dev.platform_data;
         struct twl4030_usb      *twl;
diff --git a/drivers/usb/serial/aircable.c b/drivers/usb/serial/aircable.c
index 6d106e74265e..2cbfab3716e5 100644
--- a/drivers/usb/serial/aircable.c
+++ b/drivers/usb/serial/aircable.c
@@ -364,7 +364,7 @@ static int aircable_attach(struct usb_serial *serial)
         return 0;
 }
 
-static void aircable_shutdown(struct usb_serial *serial)
+static void aircable_release(struct usb_serial *serial)
 {
 
         struct usb_serial_port *port = serial->port[0];
@@ -375,7 +375,6 @@ static void aircable_shutdown(struct usb_serial *serial)
         if (priv) {
                 serial_buf_free(priv->tx_buf);
                 serial_buf_free(priv->rx_buf);
-                usb_set_serial_port_data(port, NULL);
                 kfree(priv);
         }
 }
@@ -601,7 +600,7 @@ static struct usb_serial_driver aircable_device = {
         .num_ports =            1,
         .attach =               aircable_attach,
         .probe =                aircable_probe,
-        .shutdown =             aircable_shutdown,
+        .release =              aircable_release,
         .write =                aircable_write,
         .write_room =           aircable_write_room,
         .write_bulk_callback =  aircable_write_bulk_callback,
diff --git a/drivers/usb/serial/belkin_sa.c b/drivers/usb/serial/belkin_sa.c
index 2bfd6dd85b5a..7033b031b443 100644
--- a/drivers/usb/serial/belkin_sa.c
+++ b/drivers/usb/serial/belkin_sa.c
@@ -90,7 +90,7 @@ static int debug;
 
 /* function prototypes for a Belkin USB Serial Adapter F5U103 */
 static int  belkin_sa_startup(struct usb_serial *serial);
-static void belkin_sa_shutdown(struct usb_serial *serial);
+static void belkin_sa_release(struct usb_serial *serial);
 static int  belkin_sa_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp);
 static void belkin_sa_close(struct usb_serial_port *port);
@@ -142,7 +142,7 @@ static struct usb_serial_driver belkin_device = {
         .tiocmget =             belkin_sa_tiocmget,
         .tiocmset =             belkin_sa_tiocmset,
         .attach =               belkin_sa_startup,
-        .shutdown =             belkin_sa_shutdown,
+        .release =              belkin_sa_release,
 };
 
 
@@ -197,14 +197,13 @@ static int belkin_sa_startup(struct usb_serial *serial)
 }
 
 
-static void belkin_sa_shutdown(struct usb_serial *serial)
+static void belkin_sa_release(struct usb_serial *serial)
 {
         struct belkin_sa_private *priv;
         int i;
 
         dbg("%s", __func__);
 
-        /* stop reads and writes on all ports */
         for (i = 0; i < serial->num_ports; ++i) {
                 /* My special items, the standard routines free my urbs */
                 priv = usb_get_serial_port_data(serial->port[i]);
diff --git a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
index 83bbb5bca2ef..ba555c528cc6 100644
--- a/drivers/usb/serial/bus.c
+++ b/drivers/usb/serial/bus.c
@@ -59,23 +59,22 @@ static int usb_serial_device_probe(struct device *dev)
                 retval = -ENODEV;
                 goto exit;
         }
+        if (port->dev_state != PORT_REGISTERING)
+                goto exit;
 
         driver = port->serial->type;
         if (driver->port_probe) {
-                if (!try_module_get(driver->driver.owner)) {
-                        dev_err(dev, "module get failed, exiting\n");
-                        retval = -EIO;
-                        goto exit;
-                }
                 retval = driver->port_probe(port);
-                module_put(driver->driver.owner);
                 if (retval)
                         goto exit;
         }
 
         retval = device_create_file(dev, &dev_attr_port_number);
-        if (retval)
+        if (retval) {
+                if (driver->port_remove)
+                        retval = driver->port_remove(port);
                 goto exit;
+        }
 
         minor = port->number;
         tty_register_device(usb_serial_tty_driver, minor, dev);
@@ -98,19 +97,15 @@ static int usb_serial_device_remove(struct device *dev)
         if (!port)
                 return -ENODEV;
 
+        if (port->dev_state != PORT_UNREGISTERING)
+                return retval;
+
         device_remove_file(&port->dev, &dev_attr_port_number);
 
         driver = port->serial->type;
-        if (driver->port_remove) {
-                if (!try_module_get(driver->driver.owner)) {
-                        dev_err(dev, "module get failed, exiting\n");
-                        retval = -EIO;
-                        goto exit;
-                }
+        if (driver->port_remove)
                 retval = driver->port_remove(port);
-                module_put(driver->driver.owner);
-        }
-exit:
+
         minor = port->number;
         tty_unregister_device(usb_serial_tty_driver, minor);
         dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 16a154d3b2fe..2b9eeda62bfe 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -50,7 +50,7 @@ static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
                 unsigned int, unsigned int);
 static void cp210x_break_ctl(struct tty_struct *, int);
 static int cp210x_startup(struct usb_serial *);
-static void cp210x_shutdown(struct usb_serial *);
+static void cp210x_disconnect(struct usb_serial *);
 
 static int debug;
 
@@ -137,7 +137,7 @@ static struct usb_serial_driver cp210x_device = {
         .tiocmget               = cp210x_tiocmget,
         .tiocmset               = cp210x_tiocmset,
         .attach                 = cp210x_startup,
-        .shutdown               = cp210x_shutdown,
+        .disconnect             = cp210x_disconnect,
 };
 
 /* Config request types */
@@ -792,7 +792,7 @@ static int cp210x_startup(struct usb_serial *serial)
         return 0;
 }
 
-static void cp210x_shutdown(struct usb_serial *serial)
+static void cp210x_disconnect(struct usb_serial *serial)
 {
         int i;
 
diff --git a/drivers/usb/serial/cyberjack.c b/drivers/usb/serial/cyberjack.c
index 933ba913e66c..336523fd7366 100644
--- a/drivers/usb/serial/cyberjack.c
+++ b/drivers/usb/serial/cyberjack.c
@@ -58,7 +58,8 @@ static int debug;
 
 /* Function prototypes */
 static int cyberjack_startup(struct usb_serial *serial);
-static void cyberjack_shutdown(struct usb_serial *serial);
+static void cyberjack_disconnect(struct usb_serial *serial);
+static void cyberjack_release(struct usb_serial *serial);
 static int  cyberjack_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp);
 static void cyberjack_close(struct usb_serial_port *port);
@@ -94,7 +95,8 @@ static struct usb_serial_driver cyberjack_device = {
         .id_table =             id_table,
         .num_ports =            1,
         .attach =               cyberjack_startup,
-        .shutdown =             cyberjack_shutdown,
+        .disconnect =           cyberjack_disconnect,
+        .release =              cyberjack_release,
         .open =                 cyberjack_open,
         .close =                cyberjack_close,
         .write =                cyberjack_write,
@@ -148,17 +150,25 @@ static int cyberjack_startup(struct usb_serial *serial)
         return 0;
 }
 
-static void cyberjack_shutdown(struct usb_serial *serial)
+static void cyberjack_disconnect(struct usb_serial *serial)
 {
         int i;
 
         dbg("%s", __func__);
 
-        for (i = 0; i < serial->num_ports; ++i) {
+        for (i = 0; i < serial->num_ports; ++i)
                 usb_kill_urb(serial->port[i]->interrupt_in_urb);
+}
+
+static void cyberjack_release(struct usb_serial *serial)
+{
+        int i;
+
+        dbg("%s", __func__);
+
+        for (i = 0; i < serial->num_ports; ++i) {
                 /* My special items, the standard routines free my urbs */
                 kfree(usb_get_serial_port_data(serial->port[i]));
-                usb_set_serial_port_data(serial->port[i], NULL);
         }
 }
 
diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index 669f93848539..9734085fd2fe 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -171,7 +171,7 @@ struct cypress_buf {
 static int  cypress_earthmate_startup(struct usb_serial *serial);
 static int  cypress_hidcom_startup(struct usb_serial *serial);
 static int  cypress_ca42v2_startup(struct usb_serial *serial);
-static void cypress_shutdown(struct usb_serial *serial);
+static void cypress_release(struct usb_serial *serial);
 static int  cypress_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp);
 static void cypress_close(struct usb_serial_port *port);
@@ -215,7 +215,7 @@ static struct usb_serial_driver cypress_earthmate_device = {
         .id_table =                     id_table_earthmate,
         .num_ports =                    1,
         .attach =                       cypress_earthmate_startup,
-        .shutdown =                     cypress_shutdown,
+        .release =                      cypress_release,
         .open =                         cypress_open,
         .close =                        cypress_close,
         .dtr_rts =                      cypress_dtr_rts,
@@ -242,7 +242,7 @@ static struct usb_serial_driver cypress_hidcom_device = {
         .id_table =                     id_table_cyphidcomrs232,
         .num_ports =                    1,
         .attach =                       cypress_hidcom_startup,
-        .shutdown =                     cypress_shutdown,
+        .release =                      cypress_release,
         .open =                         cypress_open,
         .close =                        cypress_close,
         .dtr_rts =                      cypress_dtr_rts,
@@ -269,7 +269,7 @@ static struct usb_serial_driver cypress_ca42v2_device = {
         .id_table =                     id_table_nokiaca42v2,
         .num_ports =                    1,
         .attach =                       cypress_ca42v2_startup,
-        .shutdown =                     cypress_shutdown,
+        .release =                      cypress_release,
         .open =                         cypress_open,
         .close =                        cypress_close,
         .dtr_rts =                      cypress_dtr_rts,
@@ -616,7 +616,7 @@ static int cypress_ca42v2_startup(struct usb_serial *serial)
 } /* cypress_ca42v2_startup */
 
 
-static void cypress_shutdown(struct usb_serial *serial)
+static void cypress_release(struct usb_serial *serial)
 {
         struct cypress_private *priv;
 
@@ -629,7 +629,6 @@ static void cypress_shutdown(struct usb_serial *serial)
         if (priv) {
                 cypress_buf_free(priv->buf);
                 kfree(priv);
-                usb_set_serial_port_data(serial->port[0], NULL);
         }
 }
 
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index 30f5140eff03..f4808091c47c 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -460,7 +460,8 @@ static int digi_carrier_raised(struct usb_serial_port *port);
 static void digi_dtr_rts(struct usb_serial_port *port, int on);
 static int digi_startup_device(struct usb_serial *serial);
 static int digi_startup(struct usb_serial *serial);
-static void digi_shutdown(struct usb_serial *serial);
+static void digi_disconnect(struct usb_serial *serial);
+static void digi_release(struct usb_serial *serial);
 static void digi_read_bulk_callback(struct urb *urb);
 static int digi_read_inb_callback(struct urb *urb);
 static int digi_read_oob_callback(struct urb *urb);
@@ -524,7 +525,8 @@ static struct usb_serial_driver digi_acceleport_2_device = {
         .tiocmget =                     digi_tiocmget,
         .tiocmset =                     digi_tiocmset,
         .attach =                       digi_startup,
-        .shutdown =                     digi_shutdown,
+        .disconnect =                   digi_disconnect,
+        .release =                      digi_release,
 };
 
 static struct usb_serial_driver digi_acceleport_4_device = {
@@ -550,7 +552,8 @@ static struct usb_serial_driver digi_acceleport_4_device = {
         .tiocmget =                     digi_tiocmget,
         .tiocmset =                     digi_tiocmset,
         .attach =                       digi_startup,
-        .shutdown =                     digi_shutdown,
+        .disconnect =                   digi_disconnect,
+        .release =                      digi_release,
 };
 
 
@@ -1556,16 +1559,23 @@ static int digi_startup(struct usb_serial *serial)
 }
 
 
-static void digi_shutdown(struct usb_serial *serial)
+static void digi_disconnect(struct usb_serial *serial)
 {
         int i;
-        dbg("digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt());
+        dbg("digi_disconnect: TOP, in_interrupt()=%ld", in_interrupt());
 
         /* stop reads and writes on all ports */
         for (i = 0; i < serial->type->num_ports + 1; i++) {
                 usb_kill_urb(serial->port[i]->read_urb);
                 usb_kill_urb(serial->port[i]->write_urb);
         }
+}
+
+
+static void digi_release(struct usb_serial *serial)
+{
+        int i;
+        dbg("digi_release: TOP, in_interrupt()=%ld", in_interrupt());
 
         /* free the private data structures for all ports */
         /* number of regular ports + 1 for the out-of-band port */
diff --git a/drivers/usb/serial/empeg.c b/drivers/usb/serial/empeg.c
index 2b141ccb0cd9..80cb3471adbe 100644
--- a/drivers/usb/serial/empeg.c
+++ b/drivers/usb/serial/empeg.c
@@ -90,7 +90,6 @@ static int  empeg_chars_in_buffer(struct tty_struct *tty);
 static void empeg_throttle(struct tty_struct *tty);
 static void empeg_unthrottle(struct tty_struct *tty);
 static int  empeg_startup(struct usb_serial *serial);
-static void empeg_shutdown(struct usb_serial *serial);
 static void empeg_set_termios(struct tty_struct *tty,
                 struct usb_serial_port *port, struct ktermios *old_termios);
 static void empeg_write_bulk_callback(struct urb *urb);
@@ -124,7 +123,6 @@ static struct usb_serial_driver empeg_device = {
         .throttle =             empeg_throttle,
         .unthrottle =           empeg_unthrottle,
         .attach =               empeg_startup,
-        .shutdown =             empeg_shutdown,
         .set_termios =          empeg_set_termios,
         .write =                empeg_write,
         .write_room =           empeg_write_room,
@@ -427,12 +425,6 @@ static int  empeg_startup(struct usb_serial *serial)
 }
 
 
-static void empeg_shutdown(struct usb_serial *serial)
-{
-        dbg("%s", __func__);
-}
-
-
 static void empeg_set_termios(struct tty_struct *tty,
                 struct usb_serial_port *port, struct ktermios *old_termios)
 {
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 683304d60615..3dc3768ca71c 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -47,7 +47,7 @@
 /*
  * Version Information
  */
-#define DRIVER_VERSION "v1.4.3"
+#define DRIVER_VERSION "v1.5.0"
 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Bill Ryder <bryder@sgi.com>, Kuba Ober <kuba@mareimbrium.org>"
 #define DRIVER_DESC "USB FTDI Serial Converters Driver"
 
@@ -82,7 +82,8 @@ struct ftdi_private {
         int rx_processed;
         unsigned long rx_bytes;
 
-        __u16 interface;        /* FT2232C port interface (0 for FT232/245) */
+        __u16 interface;        /* FT2232C, FT2232H or FT4232H port interface
+                                   (0 for FT232/245) */
 
         speed_t force_baud;     /* if non-zero, force the baud rate to
                                    this value */
@@ -94,6 +95,7 @@ struct ftdi_private {
         unsigned long tx_bytes;
         unsigned long tx_outstanding_bytes;
         unsigned long tx_outstanding_urbs;
+        unsigned short max_packet_size;
 };
 
 /* struct ftdi_sio_quirk is used by devices requiring special attention. */
@@ -164,6 +166,7 @@ static struct usb_device_id id_table_combined [] = {
         { USB_DEVICE(FTDI_VID, FTDI_8U232AM_ALT_PID) },
         { USB_DEVICE(FTDI_VID, FTDI_232RL_PID) },
         { USB_DEVICE(FTDI_VID, FTDI_8U2232C_PID) },
+        { USB_DEVICE(FTDI_VID, FTDI_4232H_PID) },
         { USB_DEVICE(FTDI_VID, FTDI_MICRO_CHAMELEON_PID) },
         { USB_DEVICE(FTDI_VID, FTDI_RELAIS_PID) },
         { USB_DEVICE(FTDI_VID, FTDI_OPENDCC_PID) },
@@ -673,6 +676,7 @@ static struct usb_device_id id_table_combined [] = {
         { USB_DEVICE(JETI_VID, JETI_SPC1201_PID) },
         { USB_DEVICE(MARVELL_VID, MARVELL_SHEEVAPLUG_PID),
                 .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
+        { USB_DEVICE(LARSENBRUSGAARD_VID, LB_ALTITRACK_PID) },
         { },                                    /* Optional parameter entry */
         { }                                     /* Terminating entry */
 };
@@ -693,12 +697,13 @@ static const char *ftdi_chip_name[] = {
         [FT232BM] = "FT232BM",
         [FT2232C] = "FT2232C",
         [FT232RL] = "FT232RL",
+        [FT2232H] = "FT2232H",
+        [FT4232H] = "FT4232H"
 };
 
 
 /* Constants for read urb and write urb */
 #define BUFSZ 512
-#define PKTSZ 64
 
 /* rx_flags */
 #define THROTTLED               0x01
@@ -715,7 +720,6 @@ static const char *ftdi_chip_name[] = {
 /* function prototypes for a FTDI serial converter */
 static int  ftdi_sio_probe(struct usb_serial *serial,
                                         const struct usb_device_id *id);
-static void ftdi_shutdown(struct usb_serial *serial);
 static int  ftdi_sio_port_probe(struct usb_serial_port *port);
 static int  ftdi_sio_port_remove(struct usb_serial_port *port);
 static int  ftdi_open(struct tty_struct *tty,
@@ -744,6 +748,8 @@ static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base);
 static unsigned short int ftdi_232am_baud_to_divisor(int baud);
 static __u32 ftdi_232bm_baud_base_to_divisor(int baud, int base);
 static __u32 ftdi_232bm_baud_to_divisor(int baud);
+static __u32 ftdi_2232h_baud_base_to_divisor(int baud, int base);
+static __u32 ftdi_2232h_baud_to_divisor(int baud);
 
 static struct usb_serial_driver ftdi_sio_device = {
         .driver = {
@@ -772,7 +778,6 @@ static struct usb_serial_driver ftdi_sio_device = {
         .ioctl =                ftdi_ioctl,
         .set_termios =          ftdi_set_termios,
         .break_ctl =            ftdi_break_ctl,
-        .shutdown =             ftdi_shutdown,
 };
 
 
@@ -838,6 +843,36 @@ static __u32 ftdi_232bm_baud_to_divisor(int baud)
          return ftdi_232bm_baud_base_to_divisor(baud, 48000000);
 }
 
+static __u32 ftdi_2232h_baud_base_to_divisor(int baud, int base)
+{
+        static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
+        __u32 divisor;
+        int divisor3;
+
+        /* hi-speed baud rate is 10-bit sampling instead of 16-bit */
+        divisor3 = (base / 10 / baud) * 8;
+
+        divisor = divisor3 >> 3;
+        divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
+        /* Deal with special cases for highest baud rates. */
+        if (divisor == 1)
+                divisor = 0;
+        else if (divisor == 0x4001)
+                divisor = 1;
+        /*
+         * Set this bit to turn off a divide by 2.5 on baud rate generator
+         * This enables baud rates up to 12Mbaud but cannot reach below 1200
+         * baud with this bit set
+         */
+        divisor |= 0x00020000;
+        return divisor;
+}
+
+static __u32 ftdi_2232h_baud_to_divisor(int baud)
+{
+         return ftdi_2232h_baud_base_to_divisor(baud, 120000000);
+}
+
 #define set_mctrl(port, set)            update_mctrl((port), (set), 0)
 #define clear_mctrl(port, clear)        update_mctrl((port), 0, (clear))
 
@@ -996,6 +1031,19 @@ static __u32 get_ftdi_divisor(struct tty_struct *tty,
                         baud = 9600;
                 }
                 break;
+        case FT2232H: /* FT2232H chip */
+        case FT4232H: /* FT4232H chip */
+                if ((baud <= 12000000) & (baud >= 1200)) {
+                        div_value = ftdi_2232h_baud_to_divisor(baud);
+                } else if (baud < 1200) {
+                        div_value = ftdi_232bm_baud_to_divisor(baud);
+                } else {
+                        dbg("%s - Baud rate too high!", __func__);
+                        div_value = ftdi_232bm_baud_to_divisor(9600);
+                        div_okay = 0;
+                        baud = 9600;
+                }
+                break;
         } /* priv->chip_type */
 
         if (div_okay) {
@@ -1196,14 +1244,29 @@ static void ftdi_determine_type(struct usb_serial_port *port)
         if (interfaces > 1) {
                 int inter;
 
-                /* Multiple interfaces.  Assume FT2232C. */
-                priv->chip_type = FT2232C;
+                /* Multiple interfaces.*/
+                if (version == 0x0800) {
+                        priv->chip_type = FT4232H;
+                        /* Hi-speed - baud clock runs at 120MHz */
+                        priv->baud_base = 120000000 / 2;
+                } else if (version == 0x0700) {
+                        priv->chip_type = FT2232H;
+                        /* Hi-speed - baud clock runs at 120MHz */
+                        priv->baud_base = 120000000 / 2;
+                } else
+                        priv->chip_type = FT2232C;
+
                 /* Determine interface code. */
                 inter = serial->interface->altsetting->desc.bInterfaceNumber;
-                if (inter == 0)
-                        priv->interface = PIT_SIOA;
-                else
-                        priv->interface = PIT_SIOB;
+                if (inter == 0) {
+                        priv->interface = INTERFACE_A;
+                } else  if (inter == 1) {
+                        priv->interface = INTERFACE_B;
+                } else  if (inter == 2) {
+                        priv->interface = INTERFACE_C;
+                } else  if (inter == 3) {
+                        priv->interface = INTERFACE_D;
+                }
                 /* BM-type devices have a bug where bcdDevice gets set
                  * to 0x200 when iSerialNumber is 0.  */
                 if (version < 0x500) {
@@ -1231,6 +1294,45 @@ static void ftdi_determine_type(struct usb_serial_port *port)
 }
 
 
+/* Determine the maximum packet size for the device.  This depends on the chip
+ * type and the USB host capabilities.  The value should be obtained from the
+ * device descriptor as the chip will use the appropriate values for the host.*/
+static void ftdi_set_max_packet_size(struct usb_serial_port *port)
+{
+        struct ftdi_private *priv = usb_get_serial_port_data(port);
+        struct usb_serial *serial = port->serial;
+        struct usb_device *udev = serial->dev;
+
+        struct usb_interface *interface = serial->interface;
+        struct usb_endpoint_descriptor *ep_desc = &interface->cur_altsetting->endpoint[1].desc;
+
+        unsigned num_endpoints;
+        int i = 0;
+
+        num_endpoints = interface->cur_altsetting->desc.bNumEndpoints;
+        dev_info(&udev->dev, "Number of endpoints %d\n", num_endpoints);
+
+        /* NOTE: some customers have programmed FT232R/FT245R devices
+         * with an endpoint size of 0 - not good.  In this case, we
+         * want to override the endpoint descriptor setting and use a
+         * value of 64 for wMaxPacketSize */
+        for (i = 0; i < num_endpoints; i++) {
+                dev_info(&udev->dev, "Endpoint %d MaxPacketSize %d\n", i+1,
+                        interface->cur_altsetting->endpoint[i].desc.wMaxPacketSize);
+                ep_desc = &interface->cur_altsetting->endpoint[i].desc;
+                if (ep_desc->wMaxPacketSize == 0) {
+                        ep_desc->wMaxPacketSize = cpu_to_le16(0x40);
+                        dev_info(&udev->dev, "Overriding wMaxPacketSize on endpoint %d\n", i);
+                }
+        }
+
+        /* set max packet size based on descriptor */
+        priv->max_packet_size = ep_desc->wMaxPacketSize;
+
+        dev_info(&udev->dev, "Setting MaxPacketSize %d\n", priv->max_packet_size);
+}
+
+
 /*
  * ***************************************************************************
  * Sysfs Attribute
@@ -1314,7 +1416,9 @@ static int create_sysfs_attrs(struct usb_serial_port *port)
                 if ((!retval) &&
                     (priv->chip_type == FT232BM ||
                      priv->chip_type == FT2232C ||
-                     priv->chip_type == FT232RL)) {
+                     priv->chip_type == FT232RL ||
+                     priv->chip_type == FT2232H ||
+                     priv->chip_type == FT4232H)) {
                         retval = device_create_file(&port->dev,
                                                     &dev_attr_latency_timer);
                 }
@@ -1333,7 +1437,9 @@ static void remove_sysfs_attrs(struct usb_serial_port *port)
                 device_remove_file(&port->dev, &dev_attr_event_char);
                 if (priv->chip_type == FT232BM ||
                     priv->chip_type == FT2232C ||
-                    priv->chip_type == FT232RL) {
+                    priv->chip_type == FT232RL ||
+                    priv->chip_type == FT2232H ||
+                    priv->chip_type == FT4232H) {
                         device_remove_file(&port->dev, &dev_attr_latency_timer);
                 }
         }
@@ -1416,6 +1522,7 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port)
         usb_set_serial_port_data(port, priv);
 
         ftdi_determine_type(port);
+        ftdi_set_max_packet_size(port);
         read_latency_timer(port);
         create_sysfs_attrs(port);
         return 0;
@@ -1485,18 +1592,6 @@ static int ftdi_mtxorb_hack_setup(struct usb_serial *serial)
         return 0;
 }
 
-/* ftdi_shutdown is called from usbserial:usb_serial_disconnect
- *   it is called when the usb device is disconnected
- *
- *   usbserial:usb_serial_disconnect
- *      calls __serial_close for each open of the port
- *      shutdown is called then (ie ftdi_shutdown)
- */
-static void ftdi_shutdown(struct usb_serial *serial)
-{
-        dbg("%s", __func__);
-}
-
 static void ftdi_sio_priv_release(struct kref *k)
 {
         struct ftdi_private *priv = container_of(k, struct ftdi_private, kref);
@@ -1671,8 +1766,8 @@ static int ftdi_write(struct tty_struct *tty, struct usb_serial_port *port,
         if (data_offset > 0) {
                 /* Original sio needs control bytes too... */
                 transfer_size += (data_offset *
-                                ((count + (PKTSZ - 1 - data_offset)) /
-                                 (PKTSZ - data_offset)));
+                                ((count + (priv->max_packet_size - 1 - data_offset)) /
+                                 (priv->max_packet_size - data_offset)));
         }
 
         buffer = kmalloc(transfer_size, GFP_ATOMIC);
@@ -1694,7 +1789,7 @@ static int ftdi_write(struct tty_struct *tty, struct usb_serial_port *port,
         if (data_offset > 0) {
                 /* Original sio requires control byte at start of
                    each packet. */
-                int user_pktsz = PKTSZ - data_offset;
+                int user_pktsz = priv->max_packet_size - data_offset;
                 int todo = count;
                 unsigned char *first_byte = buffer;
                 const unsigned char *current_position = buf;
@@ -1775,11 +1870,6 @@ static void ftdi_write_bulk_callback(struct urb *urb)
 
         dbg("%s - port %d", __func__, port->number);
 
-        if (status) {
-                dbg("nonzero write bulk status received: %d", status);
-                return;
-        }
-
         priv = usb_get_serial_port_data(port);
         if (!priv) {
                 dbg("%s - bad port private data pointer - exiting", __func__);
@@ -1790,13 +1880,18 @@ static void ftdi_write_bulk_callback(struct urb *urb)
         data_offset = priv->write_offset;
         if (data_offset > 0) {
                 /* Subtract the control bytes */
-                countback -= (data_offset * DIV_ROUND_UP(countback, PKTSZ));
+                countback -= (data_offset * DIV_ROUND_UP(countback, priv->max_packet_size));
         }
         spin_lock_irqsave(&priv->tx_lock, flags);
         --priv->tx_outstanding_urbs;
         priv->tx_outstanding_bytes -= countback;
         spin_unlock_irqrestore(&priv->tx_lock, flags);
 
+        if (status) {
+                dbg("nonzero write bulk status received: %d", status);
+                return;
+        }
+
         usb_serial_port_softint(port);
 } /* ftdi_write_bulk_callback */
 
@@ -1892,7 +1987,7 @@ static void ftdi_read_bulk_callback(struct urb *urb)
 
         /* count data bytes, but not status bytes */
         countread = urb->actual_length;
-        countread -= 2 * DIV_ROUND_UP(countread, PKTSZ);
+        countread -= 2 * DIV_ROUND_UP(countread, priv->max_packet_size);
         spin_lock_irqsave(&priv->rx_lock, flags);
         priv->rx_bytes += countread;
         spin_unlock_irqrestore(&priv->rx_lock, flags);
@@ -1965,7 +2060,7 @@ static void ftdi_process_read(struct work_struct *work)
 
         need_flip = 0;
         for (packet_offset = priv->rx_processed;
-                packet_offset < urb->actual_length; packet_offset += PKTSZ) {
+                packet_offset < urb->actual_length; packet_offset += priv->max_packet_size) {
                 int length;
 
                 /* Compare new line status to the old one, signal if different/
@@ -1980,7 +2075,7 @@ static void ftdi_process_read(struct work_struct *work)
                         priv->prev_status = new_status;
                 }
 
-                length = min_t(u32, PKTSZ, urb->actual_length-packet_offset)-2;
+                length = min_t(u32, priv->max_packet_size, urb->actual_length-packet_offset)-2;
                 if (length < 0) {
                         dev_err(&port->dev, "%s - bad packet length: %d\n",
                                 __func__, length+2);
@@ -2011,6 +2106,7 @@ static void ftdi_process_read(struct work_struct *work)
                 if (data[packet_offset+1] & FTDI_RS_BI) {
                         error_flag = TTY_BREAK;
                         dbg("BREAK received");
+                        usb_serial_handle_break(port);
                 }
                 if (data[packet_offset+1] & FTDI_RS_PE) {
                         error_flag = TTY_PARITY;
@@ -2025,8 +2121,11 @@ static void ftdi_process_read(struct work_struct *work)
                                 /* Note that the error flag is duplicated for
                                    every character received since we don't know
                                    which character it applied to */
-                                tty_insert_flip_char(tty,
-                                        data[packet_offset + i], error_flag);
+                                if (!usb_serial_handle_sysrq_char(port,
+                                                data[packet_offset + i]))
+                                        tty_insert_flip_char(tty,
+                                                data[packet_offset + i],
+                                                error_flag);
                         }
                         need_flip = 1;
                 }
@@ -2332,6 +2431,8 @@ static int ftdi_tiocmget(struct tty_struct *tty, struct file *file)
         case FT232BM:
         case FT2232C:
         case FT232RL:
+        case FT2232H:
+        case FT4232H:
                 /* the 8U232AM returns a two byte value (the sio is a 1 byte
                    value) - in the same format as the data returned from the in
                    point */
diff --git a/drivers/usb/serial/ftdi_sio.h b/drivers/usb/serial/ftdi_sio.h
index 12330fa1c095..f1d440a728a3 100644
--- a/drivers/usb/serial/ftdi_sio.h
+++ b/drivers/usb/serial/ftdi_sio.h
@@ -10,7 +10,7 @@
  * The device is based on the FTDI FT8U100AX chip. It has a DB25 on one side,
  * USB on the other.
  *
- * Thanx to FTDI (http://www.ftdi.co.uk) for so kindly providing details
+ * Thanx to FTDI (http://www.ftdichip.com) for so kindly providing details
  * of the protocol required to talk to the device and ongoing assistence
  * during development.
  *
@@ -28,11 +28,15 @@
 #define FTDI_8U232AM_ALT_PID 0x6006 /* FTDI's alternate PID for above */
 #define FTDI_8U2232C_PID 0x6010 /* Dual channel device */
 #define FTDI_232RL_PID  0xFBFA  /* Product ID for FT232RL */
+#define FTDI_4232H_PID 0x6011 /* Quad channel hi-speed device */
 #define FTDI_RELAIS_PID 0xFA10  /* Relais device from Rudolf Gugler */
 #define FTDI_NF_RIC_VID 0x0DCD  /* Vendor Id */
 #define FTDI_NF_RIC_PID 0x0001  /* Product Id */
 #define FTDI_USBX_707_PID 0xF857        /* ADSTech IR Blaster USBX-707 */
 
+/* Larsen and Brusgaard AltiTrack/USBtrack  */
+#define LARSENBRUSGAARD_VID             0x0FD8
+#define LB_ALTITRACK_PID                0x0001
 
 /* www.canusb.com Lawicel CANUSB device */
 #define FTDI_CANUSB_PID 0xFFA8 /* Product Id */
@@ -873,6 +877,11 @@
 #define FTDI_SIO_SET_LATENCY_TIMER      9 /* Set the latency timer */
 #define FTDI_SIO_GET_LATENCY_TIMER      10 /* Get the latency timer */
 
+/* Interface indicies for FT2232, FT2232H and FT4232H devices*/
+#define INTERFACE_A             1
+#define INTERFACE_B             2
+#define INTERFACE_C             3
+#define INTERFACE_D             4
 
 /*
  * FIC / OpenMoko, Inc. http://wiki.openmoko.org/wiki/Neo1973_Debug_Board_v3
@@ -1036,6 +1045,8 @@ typedef enum {
         FT232BM = 3,
         FT2232C = 4,
         FT232RL = 5,
+        FT2232H = 6,
+        FT4232H = 7
 } ftdi_chip_type_t;
 
 typedef enum {
diff --git a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c
index ee25a3fe3b09..8839f1c70b7f 100644
--- a/drivers/usb/serial/garmin_gps.c
+++ b/drivers/usb/serial/garmin_gps.c
@@ -1,7 +1,7 @@
 /*
  * Garmin GPS driver
  *
- * Copyright (C) 2006,2007 Hermann Kneissel herkne@users.sourceforge.net
+ * Copyright (C) 2006-2009 Hermann Kneissel herkne@users.sourceforge.net
  *
  * The latest version of the driver can be found at
  * http://sourceforge.net/projects/garmin-gps/
@@ -51,7 +51,7 @@ static int debug;
  */
 
 #define VERSION_MAJOR   0
-#define VERSION_MINOR   31
+#define VERSION_MINOR   33
 
 #define _STR(s) #s
 #define _DRIVER_VERSION(a, b) "v" _STR(a) "." _STR(b)
@@ -129,7 +129,6 @@ struct garmin_data {
         __u8   state;
         __u16  flags;
         __u8   mode;
-        __u8   ignorePkts;
         __u8   count;
         __u8   pkt_id;
         __u32  serial_num;
@@ -141,8 +140,6 @@ struct garmin_data {
         __u8   inbuffer [GPS_IN_BUFSIZ];  /* tty -> usb */
         __u8   outbuffer[GPS_OUT_BUFSIZ]; /* usb -> tty */
         __u8   privpkt[4*6];
-        atomic_t req_count;
-        atomic_t resp_count;
         spinlock_t lock;
         struct list_head pktlist;
 };
@@ -170,6 +167,8 @@ struct garmin_data {
 #define FLAGS_BULK_IN_ACTIVE      0x0020
 #define FLAGS_BULK_IN_RESTART     0x0010
 #define FLAGS_THROTTLED           0x0008
+#define APP_REQ_SEEN              0x0004
+#define APP_RESP_SEEN             0x0002
 #define CLEAR_HALT_REQUIRED       0x0001
 
 #define FLAGS_QUEUING             0x0100
@@ -184,20 +183,16 @@ struct garmin_data {
 
 
 /* function prototypes */
-static void gsp_next_packet(struct garmin_data *garmin_data_p);
-static int  garmin_write_bulk(struct usb_serial_port *port,
+static int gsp_next_packet(struct garmin_data *garmin_data_p);
+static int garmin_write_bulk(struct usb_serial_port *port,
                              const unsigned char *buf, int count,
                              int dismiss_ack);
 
 /* some special packets to be send or received */
 static unsigned char const GARMIN_START_SESSION_REQ[]
         = { 0, 0, 0, 0,  5, 0, 0, 0, 0, 0, 0, 0 };
-static unsigned char const GARMIN_START_SESSION_REQ2[]
-        = { 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
 static unsigned char const GARMIN_START_SESSION_REPLY[]
         = { 0, 0, 0, 0,  6, 0, 0, 0, 4, 0, 0, 0 };
-static unsigned char const GARMIN_SESSION_ACTIVE_REPLY[]
-        = { 0, 0, 0, 0, 17, 0, 0, 0, 4, 0, 0, 0, 0, 16, 0, 0 };
 static unsigned char const GARMIN_BULK_IN_AVAIL_REPLY[]
         = { 0, 0, 0, 0,  2, 0, 0, 0, 0, 0, 0, 0 };
 static unsigned char const GARMIN_APP_LAYER_REPLY[]
@@ -233,13 +228,6 @@ static struct usb_driver garmin_driver = {
 };
 
 
-static inline int noResponseFromAppLayer(struct garmin_data *garmin_data_p)
-{
-        return atomic_read(&garmin_data_p->req_count) ==
-                                atomic_read(&garmin_data_p->resp_count);
-}
-
-
 static inline int getLayerId(const __u8 *usbPacket)
 {
         return __le32_to_cpup((__le32 *)(usbPacket));
@@ -325,8 +313,11 @@ static int pkt_add(struct garmin_data *garmin_data_p,
                 state = garmin_data_p->state;
                 spin_unlock_irqrestore(&garmin_data_p->lock, flags);
 
+                dbg("%s - added: pkt: %d - %d bytes",
+                        __func__, pkt->seq, data_length);
+
                 /* in serial mode, if someone is waiting for data from
-                   the device, iconvert and send the next packet to tty. */
+                   the device, convert and send the next packet to tty. */
                 if (result && (state == STATE_GSP_WAIT_DATA))
                         gsp_next_packet(garmin_data_p);
         }
@@ -411,7 +402,7 @@ static int gsp_send_ack(struct garmin_data *garmin_data_p, __u8 pkt_id)
 /*
  * called for a complete packet received from tty layer
  *
- * the complete packet (pkzid ... cksum) is in garmin_data_p->inbuf starting
+ * the complete packet (pktid ... cksum) is in garmin_data_p->inbuf starting
  * at GSP_INITIAL_OFFSET.
  *
  * count - number of bytes in the input buffer including space reserved for
@@ -501,7 +492,6 @@ static int gsp_receive(struct garmin_data *garmin_data_p,
         unsigned long flags;
         int offs = 0;
         int ack_or_nak_seen = 0;
-        int i = 0;
         __u8 *dest;
         int size;
         /* dleSeen: set if last byte read was a DLE */
@@ -519,8 +509,8 @@ static int gsp_receive(struct garmin_data *garmin_data_p,
         skip = garmin_data_p->flags & FLAGS_GSP_SKIP;
         spin_unlock_irqrestore(&garmin_data_p->lock, flags);
 
-        dbg("%s - dle=%d skip=%d size=%d count=%d",
-                __func__, dleSeen, skip, size, count);
+        /* dbg("%s - dle=%d skip=%d size=%d count=%d",
+                __func__, dleSeen, skip, size, count); */
 
         if (size == 0)
                 size = GSP_INITIAL_OFFSET;
@@ -568,7 +558,6 @@ static int gsp_receive(struct garmin_data *garmin_data_p,
                 } else if (!skip) {
 
                         if (dleSeen) {
-                                dbg("non-masked DLE at %d - restarting", i);
                                 size = GSP_INITIAL_OFFSET;
                                 dleSeen = 0;
                         }
@@ -599,19 +588,19 @@ static int gsp_receive(struct garmin_data *garmin_data_p,
         else
                 garmin_data_p->flags &= ~FLAGS_GSP_DLESEEN;
 
-        if (ack_or_nak_seen)
-                garmin_data_p->state = STATE_GSP_WAIT_DATA;
-
         spin_unlock_irqrestore(&garmin_data_p->lock, flags);
 
-        if (ack_or_nak_seen)
-                gsp_next_packet(garmin_data_p);
+        if (ack_or_nak_seen) {
+                if (gsp_next_packet(garmin_data_p) > 0)
+                        garmin_data_p->state = STATE_ACTIVE;
+                else
+                        garmin_data_p->state = STATE_GSP_WAIT_DATA;
+        }
         return count;
 }
 
 
 
-
 /*
  * Sends a usb packet to the tty
  *
@@ -733,29 +722,28 @@ static int gsp_send(struct garmin_data *garmin_data_p,
 }
 
 
-
-
-
 /*
  * Process the next pending data packet - if there is one
  */
-static void gsp_next_packet(struct garmin_data *garmin_data_p)
+static int gsp_next_packet(struct garmin_data *garmin_data_p)
 {
+        int result = 0;
         struct garmin_packet *pkt = NULL;
 
         while ((pkt = pkt_pop(garmin_data_p)) != NULL) {
                 dbg("%s - next pkt: %d", __func__, pkt->seq);
-                if (gsp_send(garmin_data_p, pkt->data, pkt->size) > 0) {
+                result = gsp_send(garmin_data_p, pkt->data, pkt->size);
+                if (result > 0) {
                         kfree(pkt);
-                        return;
+                        return result;
                 }
                 kfree(pkt);
         }
+        return result;
 }
 
 
 
-
 /******************************************************************************
  * garmin native mode
  ******************************************************************************/
@@ -888,14 +876,6 @@ static int garmin_clear(struct garmin_data *garmin_data_p)
         unsigned long flags;
         int status = 0;
 
-        struct usb_serial_port *port = garmin_data_p->port;
-
-        if (port != NULL && atomic_read(&garmin_data_p->resp_count)) {
-                /* send a terminate command */
-                status = garmin_write_bulk(port, GARMIN_STOP_TRANSFER_REQ,
-                                        sizeof(GARMIN_STOP_TRANSFER_REQ), 1);
-        }
-
         /* flush all queued data */
         pkt_clear(garmin_data_p);
 
@@ -908,16 +888,12 @@ static int garmin_clear(struct garmin_data *garmin_data_p)
 }
 
 
-
-
-
-
 static int garmin_init_session(struct usb_serial_port *port)
 {
-        unsigned long flags;
         struct usb_serial *serial = port->serial;
         struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
         int status = 0;
+        int i = 0;
 
         if (status == 0) {
                 usb_kill_urb(port->interrupt_in_urb);
@@ -931,30 +907,25 @@ static int garmin_init_session(struct usb_serial_port *port)
                                                         __func__, status);
         }
 
+        /*
+         * using the initialization method from gpsbabel. See comments in
+         * gpsbabel/jeeps/gpslibusb.c gusb_reset_toggles()
+         */
         if (status == 0) {
                 dbg("%s - starting session ...", __func__);
                 garmin_data_p->state = STATE_ACTIVE;
-                status = garmin_write_bulk(port, GARMIN_START_SESSION_REQ,
-                                        sizeof(GARMIN_START_SESSION_REQ), 0);
-
-                if (status >= 0) {
-
-                        spin_lock_irqsave(&garmin_data_p->lock, flags);
-                        garmin_data_p->ignorePkts++;
-                        spin_unlock_irqrestore(&garmin_data_p->lock, flags);
 
-                        /* not needed, but the win32 driver does it too ... */
+                for (i = 0; i < 3; i++) {
                         status = garmin_write_bulk(port,
-                                        GARMIN_START_SESSION_REQ2,
-                                        sizeof(GARMIN_START_SESSION_REQ2), 0);
-                        if (status >= 0) {
-                                status = 0;
-                                spin_lock_irqsave(&garmin_data_p->lock, flags);
-                                garmin_data_p->ignorePkts++;
-                                spin_unlock_irqrestore(&garmin_data_p->lock,
-                                                                        flags);
-                        }
+                                        GARMIN_START_SESSION_REQ,
+                                        sizeof(GARMIN_START_SESSION_REQ), 0);
+
+                        if (status < 0)
+                                break;
                 }
+
+                if (status > 0)
+                        status = 0;
         }
 
         return status;
@@ -962,8 +933,6 @@ static int garmin_init_session(struct usb_serial_port *port)
 
 
 
-
-
 static int garmin_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp)
 {
@@ -977,8 +946,6 @@ static int garmin_open(struct tty_struct *tty,
         garmin_data_p->mode  = initial_mode;
         garmin_data_p->count = 0;
         garmin_data_p->flags = 0;
-        atomic_set(&garmin_data_p->req_count, 0);
-        atomic_set(&garmin_data_p->resp_count, 0);
         spin_unlock_irqrestore(&garmin_data_p->lock, flags);
 
         /* shutdown any bulk reads that might be going on */
@@ -1006,6 +973,7 @@ static void garmin_close(struct usb_serial_port *port)
                 return;
 
         mutex_lock(&port->serial->disc_mutex);
+
         if (!port->serial->disconnected)
                 garmin_clear(garmin_data_p);
 
@@ -1013,25 +981,17 @@ static void garmin_close(struct usb_serial_port *port)
         usb_kill_urb(port->read_urb);
         usb_kill_urb(port->write_urb);
 
-        if (!port->serial->disconnected) {
-                if (noResponseFromAppLayer(garmin_data_p) ||
-                    ((garmin_data_p->flags & CLEAR_HALT_REQUIRED) != 0)) {
-                        process_resetdev_request(port);
-                        garmin_data_p->state = STATE_RESET;
-                } else {
-                        garmin_data_p->state = STATE_DISCONNECTED;
-                }
-        } else {
+        /* keep reset state so we know that we must start a new session */
+        if (garmin_data_p->state != STATE_RESET)
                 garmin_data_p->state = STATE_DISCONNECTED;
-        }
+
         mutex_unlock(&port->serial->disc_mutex);
 }
 
+
 static void garmin_write_bulk_callback(struct urb *urb)
 {
-        unsigned long flags;
         struct usb_serial_port *port = urb->context;
-        int status = urb->status;
 
         if (port) {
                 struct garmin_data *garmin_data_p =
@@ -1039,20 +999,13 @@ static void garmin_write_bulk_callback(struct urb *urb)
 
                 dbg("%s - port %d", __func__, port->number);
 
-                if (GARMIN_LAYERID_APPL == getLayerId(urb->transfer_buffer)
-                    && (garmin_data_p->mode == MODE_GARMIN_SERIAL))  {
-                        gsp_send_ack(garmin_data_p,
-                                        ((__u8 *)urb->transfer_buffer)[4]);
-                }
+                if (GARMIN_LAYERID_APPL == getLayerId(urb->transfer_buffer)) {
 
-                if (status) {
-                        dbg("%s - nonzero write bulk status received: %d",
-                            __func__, status);
-                        spin_lock_irqsave(&garmin_data_p->lock, flags);
-                        garmin_data_p->flags |= CLEAR_HALT_REQUIRED;
-                        spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+                        if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
+                                gsp_send_ack(garmin_data_p,
+                                        ((__u8 *)urb->transfer_buffer)[4]);
+                        }
                 }
-
                 usb_serial_port_softint(port);
         }
 
@@ -1108,7 +1061,11 @@ static int garmin_write_bulk(struct usb_serial_port *port,
         urb->transfer_flags |= URB_ZERO_PACKET;
 
         if (GARMIN_LAYERID_APPL == getLayerId(buffer)) {
-                atomic_inc(&garmin_data_p->req_count);
+
+                spin_lock_irqsave(&garmin_data_p->lock, flags);
+                garmin_data_p->flags |= APP_REQ_SEEN;
+                spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
                 if (garmin_data_p->mode == MODE_GARMIN_SERIAL)  {
                         pkt_clear(garmin_data_p);
                         garmin_data_p->state = STATE_GSP_WAIT_DATA;
@@ -1140,6 +1097,9 @@ static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
 
         usb_serial_debug_data(debug, &port->dev, __func__, count, buf);
 
+        if (garmin_data_p->state == STATE_RESET)
+                return -EIO;
+
         /* check for our private packets */
         if (count >= GARMIN_PKTHDR_LENGTH) {
                 len = PRIVPKTSIZ;
@@ -1184,7 +1144,7 @@ static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
                                 break;
 
                         case PRIV_PKTID_RESET_REQ:
-                                atomic_inc(&garmin_data_p->req_count);
+                                process_resetdev_request(port);
                                 break;
 
                         case PRIV_PKTID_SET_DEF_MODE:
@@ -1200,8 +1160,6 @@ static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
                 }
         }
 
-        garmin_data_p->ignorePkts = 0;
-
         if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
                 return gsp_receive(garmin_data_p, buf, count);
         } else {        /* MODE_NATIVE */
@@ -1224,31 +1182,33 @@ static int garmin_write_room(struct tty_struct *tty)
 static void garmin_read_process(struct garmin_data *garmin_data_p,
                                  unsigned char *data, unsigned data_length)
 {
+        unsigned long flags;
+
         if (garmin_data_p->flags & FLAGS_DROP_DATA) {
                 /* abort-transfer cmd is actice */
                 dbg("%s - pkt dropped", __func__);
         } else if (garmin_data_p->state != STATE_DISCONNECTED &&
                 garmin_data_p->state != STATE_RESET) {
 
-                /* remember any appl.layer packets, so we know
-                   if a reset is required or not when closing
-                   the device */
-                if (0 == memcmp(data, GARMIN_APP_LAYER_REPLY,
-                                sizeof(GARMIN_APP_LAYER_REPLY))) {
-                        atomic_inc(&garmin_data_p->resp_count);
-                }
-
                 /* if throttling is active or postprecessing is required
                    put the received data in the input queue, otherwise
                    send it directly to the tty port */
                 if (garmin_data_p->flags & FLAGS_QUEUING) {
                         pkt_add(garmin_data_p, data, data_length);
-                } else if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
-                        if (getLayerId(data) == GARMIN_LAYERID_APPL)
+                } else if (getLayerId(data) == GARMIN_LAYERID_APPL) {
+
+                        spin_lock_irqsave(&garmin_data_p->lock, flags);
+                        garmin_data_p->flags |= APP_RESP_SEEN;
+                        spin_unlock_irqrestore(&garmin_data_p->lock, flags);
+
+                        if (garmin_data_p->mode == MODE_GARMIN_SERIAL) {
                                 pkt_add(garmin_data_p, data, data_length);
-                } else {
-                        send_to_tty(garmin_data_p->port, data, data_length);
+                        } else {
+                                send_to_tty(garmin_data_p->port, data,
+                                                data_length);
+                        }
                 }
+                /* ignore system layer packets ... */
         }
 }
 
@@ -1363,8 +1323,6 @@ static void garmin_read_int_callback(struct urb *urb)
                         } else {
                                 spin_lock_irqsave(&garmin_data_p->lock, flags);
                                 garmin_data_p->flags |= FLAGS_BULK_IN_ACTIVE;
-                                /* do not send this packet to the user */
-                                garmin_data_p->ignorePkts = 1;
                                 spin_unlock_irqrestore(&garmin_data_p->lock,
                                                                         flags);
                         }
@@ -1391,17 +1349,7 @@ static void garmin_read_int_callback(struct urb *urb)
                         __func__, garmin_data_p->serial_num);
         }
 
-        if (garmin_data_p->ignorePkts) {
-                /* this reply belongs to a request generated by the driver,
-                   ignore it. */
-                dbg("%s - pkt ignored (%d)",
-                        __func__, garmin_data_p->ignorePkts);
-                spin_lock_irqsave(&garmin_data_p->lock, flags);
-                garmin_data_p->ignorePkts--;
-                spin_unlock_irqrestore(&garmin_data_p->lock, flags);
-        } else {
-                garmin_read_process(garmin_data_p, data, urb->actual_length);
-        }
+        garmin_read_process(garmin_data_p, data, urb->actual_length);
 
         port->interrupt_in_urb->dev = port->serial->dev;
         retval = usb_submit_urb(urb, GFP_ATOMIC);
@@ -1527,7 +1475,7 @@ static int garmin_attach(struct usb_serial *serial)
 }
 
 
-static void garmin_shutdown(struct usb_serial *serial)
+static void garmin_disconnect(struct usb_serial *serial)
 {
         struct usb_serial_port *port = serial->port[0];
         struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
@@ -1536,8 +1484,17 @@ static void garmin_shutdown(struct usb_serial *serial)
 
         usb_kill_urb(port->interrupt_in_urb);
         del_timer_sync(&garmin_data_p->timer);
+}
+
+
+static void garmin_release(struct usb_serial *serial)
+{
+        struct usb_serial_port *port = serial->port[0];
+        struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
+
+        dbg("%s", __func__);
+
         kfree(garmin_data_p);
-        usb_set_serial_port_data(port, NULL);
 }
 
 
@@ -1556,7 +1513,8 @@ static struct usb_serial_driver garmin_device = {
         .throttle            = garmin_throttle,
         .unthrottle          = garmin_unthrottle,
         .attach              = garmin_attach,
-        .shutdown            = garmin_shutdown,
+        .disconnect          = garmin_disconnect,
+        .release             = garmin_release,
         .write               = garmin_write,
         .write_room          = garmin_write_room,
         .write_bulk_callback = garmin_write_bulk_callback,
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index be82ea956720..932d6241b787 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -63,7 +63,8 @@ struct usb_serial_driver usb_serial_generic_device = {
         .id_table =             generic_device_ids,
         .usb_driver =           &generic_driver,
         .num_ports =            1,
-        .shutdown =             usb_serial_generic_shutdown,
+        .disconnect =           usb_serial_generic_disconnect,
+        .release =              usb_serial_generic_release,
         .throttle =             usb_serial_generic_throttle,
         .unthrottle =           usb_serial_generic_unthrottle,
         .resume =               usb_serial_generic_resume,
@@ -190,6 +191,88 @@ void usb_serial_generic_close(struct usb_serial_port *port)
         generic_cleanup(port);
 }
 
+static int usb_serial_multi_urb_write(struct tty_struct *tty,
+        struct usb_serial_port *port, const unsigned char *buf, int count)
+{
+        unsigned long flags;
+        struct urb *urb;
+        unsigned char *buffer;
+        int status;
+        int towrite;
+        int bwrite = 0;
+
+        dbg("%s - port %d", __func__, port->number);
+
+        if (count == 0)
+                dbg("%s - write request of 0 bytes", __func__);
+
+        while (count > 0) {
+                towrite = (count > port->bulk_out_size) ?
+                        port->bulk_out_size : count;
+                spin_lock_irqsave(&port->lock, flags);
+                if (port->urbs_in_flight >
+                    port->serial->type->max_in_flight_urbs) {
+                        spin_unlock_irqrestore(&port->lock, flags);
+                        dbg("%s - write limit hit\n", __func__);
+                        return bwrite;
+                }
+                port->tx_bytes_flight += towrite;
+                port->urbs_in_flight++;
+                spin_unlock_irqrestore(&port->lock, flags);
+
+                buffer = kmalloc(towrite, GFP_ATOMIC);
+                if (!buffer) {
+                        dev_err(&port->dev,
+                        "%s ran out of kernel memory for urb ...\n", __func__);
+                        goto error_no_buffer;
+                }
+
+                urb = usb_alloc_urb(0, GFP_ATOMIC);
+                if (!urb) {
+                        dev_err(&port->dev, "%s - no more free urbs\n",
+                                __func__);
+                        goto error_no_urb;
+                }
+
+                /* Copy data */
+                memcpy(buffer, buf + bwrite, towrite);
+                usb_serial_debug_data(debug, &port->dev, __func__,
+                                      towrite, buffer);
+                /* fill the buffer and send it */
+                usb_fill_bulk_urb(urb, port->serial->dev,
+                        usb_sndbulkpipe(port->serial->dev,
+                                        port->bulk_out_endpointAddress),
+                        buffer, towrite,
+                        usb_serial_generic_write_bulk_callback, port);
+
+                status = usb_submit_urb(urb, GFP_ATOMIC);
+                if (status) {
+                        dev_err(&port->dev,
+                                "%s - failed submitting write urb, error %d\n",
+                                __func__, status);
+                        goto error;
+                }
+
+                /* This urb is the responsibility of the host driver now */
+                usb_free_urb(urb);
+                dbg("%s write: %d", __func__, towrite);
+                count -= towrite;
+                bwrite += towrite;
+        }
+        return bwrite;
+
+error:
+        usb_free_urb(urb);
+error_no_urb:
+        kfree(buffer);
+error_no_buffer:
+        spin_lock_irqsave(&port->lock, flags);
+        port->urbs_in_flight--;
+        port->tx_bytes_flight -= towrite;
+        spin_unlock_irqrestore(&port->lock, flags);
+        return bwrite;
+}
+
 int usb_serial_generic_write(struct tty_struct *tty,
         struct usb_serial_port *port, const unsigned char *buf, int count)
 {
@@ -207,6 +290,11 @@ int usb_serial_generic_write(struct tty_struct *tty,
         /* only do something if we have a bulk out endpoint */
         if (serial->num_bulk_out) {
                 unsigned long flags;
+
+                if (serial->type->max_in_flight_urbs)
+                        return usb_serial_multi_urb_write(tty, port,
+                                                          buf, count);
+
                 spin_lock_irqsave(&port->lock, flags);
                 if (port->write_urb_busy) {
                         spin_unlock_irqrestore(&port->lock, flags);
@@ -252,20 +340,26 @@ int usb_serial_generic_write(struct tty_struct *tty,
         /* no bulk out, so return 0 bytes written */
         return 0;
 }
+EXPORT_SYMBOL_GPL(usb_serial_generic_write);
 
 int usb_serial_generic_write_room(struct tty_struct *tty)
 {
         struct usb_serial_port *port = tty->driver_data;
         struct usb_serial *serial = port->serial;
+        unsigned long flags;
         int room = 0;
 
         dbg("%s - port %d", __func__, port->number);
-
-        /* FIXME: Locking */
-        if (serial->num_bulk_out) {
-                if (!(port->write_urb_busy))
-                        room = port->bulk_out_size;
+        spin_lock_irqsave(&port->lock, flags);
+        if (serial->type->max_in_flight_urbs) {
+                if (port->urbs_in_flight < serial->type->max_in_flight_urbs)
+                        room = port->bulk_out_size *
+                                (serial->type->max_in_flight_urbs -
+                                 port->urbs_in_flight);
+        } else if (serial->num_bulk_out && !(port->write_urb_busy)) {
+                room = port->bulk_out_size;
         }
+        spin_unlock_irqrestore(&port->lock, flags);
 
         dbg("%s - returns %d", __func__, room);
         return room;
@@ -276,11 +370,16 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
         struct usb_serial_port *port = tty->driver_data;
         struct usb_serial *serial = port->serial;
         int chars = 0;
+        unsigned long flags;
 
         dbg("%s - port %d", __func__, port->number);
 
-        /* FIXME: Locking */
-        if (serial->num_bulk_out) {
+        if (serial->type->max_in_flight_urbs) {
+                spin_lock_irqsave(&port->lock, flags);
+                chars = port->tx_bytes_flight;
+                spin_unlock_irqrestore(&port->lock, flags);
+        } else if (serial->num_bulk_out) {
+                /* FIXME: Locking */
                 if (port->write_urb_busy)
                         chars = port->write_urb->transfer_buffer_length;
         }
@@ -290,7 +389,8 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
 }
 
 
-static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
+void usb_serial_generic_resubmit_read_urb(struct usb_serial_port *port,
+                        gfp_t mem_flags)
 {
         struct urb *urb = port->read_urb;
         struct usb_serial *serial = port->serial;
@@ -311,25 +411,28 @@ static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
                         "%s - failed resubmitting read urb, error %d\n",
                                                         __func__, result);
 }
+EXPORT_SYMBOL_GPL(usb_serial_generic_resubmit_read_urb);
 
 /* Push data to tty layer and resubmit the bulk read URB */
 static void flush_and_resubmit_read_urb(struct usb_serial_port *port)
 {
         struct urb *urb = port->read_urb;
         struct tty_struct *tty = tty_port_tty_get(&port->port);
-        int room;
+        char *ch = (char *)urb->transfer_buffer;
+        int i;
+
+        if (!tty)
+                goto done;
 
         /* Push data to tty */
-        if (tty && urb->actual_length) {
-                room = tty_buffer_request_room(tty, urb->actual_length);
-                if (room) {
-                        tty_insert_flip_string(tty, urb->transfer_buffer, room);
-                        tty_flip_buffer_push(tty);
-                }
+        for (i = 0; i < urb->actual_length; i++, ch++) {
+                if (!usb_serial_handle_sysrq_char(port, *ch))
+                        tty_insert_flip_char(tty, *ch, TTY_NORMAL);
         }
+        tty_flip_buffer_push(tty);
         tty_kref_put(tty);
-
-        resubmit_read_urb(port, GFP_ATOMIC);
+done:
+        usb_serial_generic_resubmit_read_urb(port, GFP_ATOMIC);
 }
 
 void usb_serial_generic_read_bulk_callback(struct urb *urb)
@@ -363,12 +466,24 @@ EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
 
 void usb_serial_generic_write_bulk_callback(struct urb *urb)
 {
+        unsigned long flags;
         struct usb_serial_port *port = urb->context;
         int status = urb->status;
 
         dbg("%s - port %d", __func__, port->number);
 
-        port->write_urb_busy = 0;
+        if (port->serial->type->max_in_flight_urbs) {
+                spin_lock_irqsave(&port->lock, flags);
+                --port->urbs_in_flight;
+                port->tx_bytes_flight -= urb->transfer_buffer_length;
+                if (port->urbs_in_flight < 0)
+                        port->urbs_in_flight = 0;
+                spin_unlock_irqrestore(&port->lock, flags);
+        } else {
+                /* Handle the case for single urb mode */
+                port->write_urb_busy = 0;
+        }
+
         if (status) {
                 dbg("%s - nonzero write bulk status received: %d",
                     __func__, status);
@@ -408,11 +523,36 @@ void usb_serial_generic_unthrottle(struct tty_struct *tty)
 
         if (was_throttled) {
                 /* Resume reading from device */
-                resubmit_read_urb(port, GFP_KERNEL);
+                usb_serial_generic_resubmit_read_urb(port, GFP_KERNEL);
+        }
+}
+
+int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
+{
+        if (port->sysrq && port->console) {
+                if (ch && time_before(jiffies, port->sysrq)) {
+                        handle_sysrq(ch, tty_port_tty_get(&port->port));
+                        port->sysrq = 0;
+                        return 1;
+                }
+                port->sysrq = 0;
+        }
+        return 0;
+}
+EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char);
+
+int usb_serial_handle_break(struct usb_serial_port *port)
+{
+        if (!port->sysrq) {
+                port->sysrq = jiffies + HZ*5;
+                return 1;
         }
+        port->sysrq = 0;
+        return 0;
 }
+EXPORT_SYMBOL_GPL(usb_serial_handle_break);
 
-void usb_serial_generic_shutdown(struct usb_serial *serial)
+void usb_serial_generic_disconnect(struct usb_serial *serial)
 {
         int i;
 
@@ -423,3 +563,7 @@ void usb_serial_generic_shutdown(struct usb_serial *serial)
                 generic_cleanup(serial->port[i]);
 }
 
+void usb_serial_generic_release(struct usb_serial *serial)
+{
+        dbg("%s", __func__);
+}
diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index 53ef5996e33d..0191693625d6 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -224,7 +224,8 @@ static int  edge_tiocmget(struct tty_struct *tty, struct file *file);
 static int  edge_tiocmset(struct tty_struct *tty, struct file *file,
                                         unsigned int set, unsigned int clear);
 static int  edge_startup(struct usb_serial *serial);
-static void edge_shutdown(struct usb_serial *serial);
+static void edge_disconnect(struct usb_serial *serial);
+static void edge_release(struct usb_serial *serial);
 
 #include "io_tables.h"  /* all of the devices that this driver supports */
 
@@ -3193,21 +3194,16 @@ static int edge_startup(struct usb_serial *serial)
 
 
 /****************************************************************************
- * edge_shutdown
+ * edge_disconnect
  *      This function is called whenever the device is removed from the usb bus.
  ****************************************************************************/
-static void edge_shutdown(struct usb_serial *serial)
+static void edge_disconnect(struct usb_serial *serial)
 {
         struct edgeport_serial *edge_serial = usb_get_serial_data(serial);
-        int i;
 
         dbg("%s", __func__);
 
         /* stop reads and writes on all ports */
-        for (i = 0; i < serial->num_ports; ++i) {
-                kfree(usb_get_serial_port_data(serial->port[i]));
-                usb_set_serial_port_data(serial->port[i],  NULL);
-        }
         /* free up our endpoint stuff */
         if (edge_serial->is_epic) {
                 usb_kill_urb(edge_serial->interrupt_read_urb);
@@ -3218,9 +3214,24 @@ static void edge_shutdown(struct usb_serial *serial)
                 usb_free_urb(edge_serial->read_urb);
                 kfree(edge_serial->bulk_in_buffer);
         }
+}
+
+
+/****************************************************************************
+ * edge_release
+ *      This function is called when the device structure is deallocated.
+ ****************************************************************************/
+static void edge_release(struct usb_serial *serial)
+{
+        struct edgeport_serial *edge_serial = usb_get_serial_data(serial);
+        int i;
+
+        dbg("%s", __func__);
+
+        for (i = 0; i < serial->num_ports; ++i)
+                kfree(usb_get_serial_port_data(serial->port[i]));
 
         kfree(edge_serial);
-        usb_set_serial_data(serial, NULL);
 }
 
 
diff --git a/drivers/usb/serial/io_tables.h b/drivers/usb/serial/io_tables.h
index 7eb9d67b81b6..9241d3147513 100644
--- a/drivers/usb/serial/io_tables.h
+++ b/drivers/usb/serial/io_tables.h
@@ -117,7 +117,8 @@ static struct usb_serial_driver edgeport_2port_device = {
         .throttle               = edge_throttle,
         .unthrottle             = edge_unthrottle,
         .attach                 = edge_startup,
-        .shutdown               = edge_shutdown,
+        .disconnect             = edge_disconnect,
+        .release                = edge_release,
         .ioctl                  = edge_ioctl,
         .set_termios            = edge_set_termios,
         .tiocmget               = edge_tiocmget,
@@ -145,7 +146,8 @@ static struct usb_serial_driver edgeport_4port_device = {
         .throttle               = edge_throttle,
         .unthrottle             = edge_unthrottle,
         .attach                 = edge_startup,
-        .shutdown               = edge_shutdown,
+        .disconnect             = edge_disconnect,
+        .release                = edge_release,
         .ioctl                  = edge_ioctl,
         .set_termios            = edge_set_termios,
         .tiocmget               = edge_tiocmget,
@@ -173,7 +175,8 @@ static struct usb_serial_driver edgeport_8port_device = {
         .throttle               = edge_throttle,
         .unthrottle             = edge_unthrottle,
         .attach                 = edge_startup,
-        .shutdown               = edge_shutdown,
+        .disconnect             = edge_disconnect,
+        .release                = edge_release,
         .ioctl                  = edge_ioctl,
         .set_termios            = edge_set_termios,
         .tiocmget               = edge_tiocmget,
@@ -200,7 +203,8 @@ static struct usb_serial_driver epic_device = {
         .throttle               = edge_throttle,
         .unthrottle             = edge_unthrottle,
         .attach                 = edge_startup,
-        .shutdown               = edge_shutdown,
+        .disconnect             = edge_disconnect,
+        .release                = edge_release,
         .ioctl                  = edge_ioctl,
         .set_termios            = edge_set_termios,
         .tiocmget               = edge_tiocmget,
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index db964db42d3c..e8bc42f92e79 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -2663,7 +2663,7 @@ cleanup:
         return -ENOMEM;
 }
 
-static void edge_shutdown(struct usb_serial *serial)
+static void edge_disconnect(struct usb_serial *serial)
 {
         int i;
         struct edgeport_port *edge_port;
@@ -2673,12 +2673,22 @@ static void edge_shutdown(struct usb_serial *serial)
         for (i = 0; i < serial->num_ports; ++i) {
                 edge_port = usb_get_serial_port_data(serial->port[i]);
                 edge_remove_sysfs_attrs(edge_port->port);
+        }
+}
+
+static void edge_release(struct usb_serial *serial)
+{
+        int i;
+        struct edgeport_port *edge_port;
+
+        dbg("%s", __func__);
+
+        for (i = 0; i < serial->num_ports; ++i) {
+                edge_port = usb_get_serial_port_data(serial->port[i]);
                 edge_buf_free(edge_port->ep_out_buf);
                 kfree(edge_port);
-                usb_set_serial_port_data(serial->port[i], NULL);
         }
         kfree(usb_get_serial_data(serial));
-        usb_set_serial_data(serial, NULL);
 }
 
 
@@ -2915,7 +2925,8 @@ static struct usb_serial_driver edgeport_1port_device = {
         .throttle               = edge_throttle,
         .unthrottle             = edge_unthrottle,
         .attach                 = edge_startup,
-        .shutdown               = edge_shutdown,
+        .disconnect             = edge_disconnect,
+        .release                = edge_release,
         .port_probe             = edge_create_sysfs_attrs,
         .ioctl                  = edge_ioctl,
         .set_termios            = edge_set_termios,
@@ -2944,7 +2955,8 @@ static struct usb_serial_driver edgeport_2port_device = {
         .throttle               = edge_throttle,
         .unthrottle             = edge_unthrottle,
         .attach                 = edge_startup,
-        .shutdown               = edge_shutdown,
+        .disconnect             = edge_disconnect,
+        .release                = edge_release,
         .port_probe             = edge_create_sysfs_attrs,
         .ioctl                  = edge_ioctl,
         .set_termios            = edge_set_termios,
diff --git a/drivers/usb/serial/ipaq.c b/drivers/usb/serial/ipaq.c
index c610a99fa477..2545d45ce16f 100644
--- a/drivers/usb/serial/ipaq.c
+++ b/drivers/usb/serial/ipaq.c
@@ -79,7 +79,6 @@ static int  ipaq_open(struct tty_struct *tty,
 static void ipaq_close(struct usb_serial_port *port);
 static int  ipaq_calc_num_ports(struct usb_serial *serial);
 static int  ipaq_startup(struct usb_serial *serial);
-static void ipaq_shutdown(struct usb_serial *serial);
 static int ipaq_write(struct tty_struct *tty, struct usb_serial_port *port,
                         const unsigned char *buf, int count);
 static int ipaq_write_bulk(struct usb_serial_port *port,
@@ -576,7 +575,6 @@ static struct usb_serial_driver ipaq_device = {
         .close =                ipaq_close,
         .attach =               ipaq_startup,
         .calc_num_ports =       ipaq_calc_num_ports,
-        .shutdown =             ipaq_shutdown,
         .write =                ipaq_write,
         .write_room =           ipaq_write_room,
         .chars_in_buffer =      ipaq_chars_in_buffer,
@@ -990,11 +988,6 @@ static int ipaq_startup(struct usb_serial *serial)
         return usb_reset_configuration(serial->dev);
 }
 
-static void ipaq_shutdown(struct usb_serial *serial)
-{
-        dbg("%s", __func__);
-}
-
 static int __init ipaq_init(void)
 {
         int retval;
diff --git a/drivers/usb/serial/iuu_phoenix.c b/drivers/usb/serial/iuu_phoenix.c
index 76a3cc327bb9..96873a7a32b0 100644
--- a/drivers/usb/serial/iuu_phoenix.c
+++ b/drivers/usb/serial/iuu_phoenix.c
@@ -121,8 +121,8 @@ static int iuu_startup(struct usb_serial *serial)
         return 0;
 }
 
-/* Shutdown function */
-static void iuu_shutdown(struct usb_serial *serial)
+/* Release function */
+static void iuu_release(struct usb_serial *serial)
 {
         struct usb_serial_port *port = serial->port[0];
         struct iuu_private *priv = usb_get_serial_port_data(port);
@@ -1202,7 +1202,7 @@ static struct usb_serial_driver iuu_device = {
         .tiocmset = iuu_tiocmset,
         .set_termios = iuu_set_termios,
         .attach = iuu_startup,
-        .shutdown = iuu_shutdown,
+        .release = iuu_release,
 };
 
 static int __init iuu_init(void)
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index f1195a98f316..2594b8743d3f 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -2689,7 +2689,7 @@ static int keyspan_startup(struct usb_serial *serial)
         return 0;
 }
 
-static void keyspan_shutdown(struct usb_serial *serial)
+static void keyspan_disconnect(struct usb_serial *serial)
 {
         int                             i, j;
         struct usb_serial_port          *port;
@@ -2729,6 +2729,17 @@ static void keyspan_shutdown(struct usb_serial *serial)
                         usb_free_urb(p_priv->out_urbs[j]);
                 }
         }
+}
+
+static void keyspan_release(struct usb_serial *serial)
+{
+        int                             i;
+        struct usb_serial_port          *port;
+        struct keyspan_serial_private   *s_priv;
+
+        dbg("%s", __func__);
+
+        s_priv = usb_get_serial_data(serial);
 
         /*  dbg("Freeing serial->private."); */
         kfree(s_priv);
diff --git a/drivers/usb/serial/keyspan.h b/drivers/usb/serial/keyspan.h
index 0d4569b60768..3107ed15af64 100644
--- a/drivers/usb/serial/keyspan.h
+++ b/drivers/usb/serial/keyspan.h
@@ -41,7 +41,8 @@ static int  keyspan_open		(struct tty_struct *tty,
 static void keyspan_close               (struct usb_serial_port *port);
 static void keyspan_dtr_rts             (struct usb_serial_port *port, int on);
 static int  keyspan_startup             (struct usb_serial *serial);
-static void keyspan_shutdown            (struct usb_serial *serial);
+static void keyspan_disconnect          (struct usb_serial *serial);
+static void keyspan_release             (struct usb_serial *serial);
 static int  keyspan_write_room          (struct tty_struct *tty);
 
 static int  keyspan_write               (struct tty_struct *tty,
@@ -569,7 +570,8 @@ static struct usb_serial_driver keyspan_1port_device = {
         .tiocmget               = keyspan_tiocmget,
         .tiocmset               = keyspan_tiocmset,
         .attach                 = keyspan_startup,
-        .shutdown               = keyspan_shutdown,
+        .disconnect             = keyspan_disconnect,
+        .release                = keyspan_release,
 };
 
 static struct usb_serial_driver keyspan_2port_device = {
@@ -590,7 +592,8 @@ static struct usb_serial_driver keyspan_2port_device = {
         .tiocmget               = keyspan_tiocmget,
         .tiocmset               = keyspan_tiocmset,
         .attach                 = keyspan_startup,
-        .shutdown               = keyspan_shutdown,
+        .disconnect             = keyspan_disconnect,
+        .release                = keyspan_release,
 };
 
 static struct usb_serial_driver keyspan_4port_device = {
@@ -611,7 +614,8 @@ static struct usb_serial_driver keyspan_4port_device = {
         .tiocmget               = keyspan_tiocmget,
         .tiocmset               = keyspan_tiocmset,
         .attach                 = keyspan_startup,
-        .shutdown               = keyspan_shutdown,
+        .disconnect             = keyspan_disconnect,
+        .release                = keyspan_release,
 };
 
 #endif
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index ab769dbea1b3..d0b12e40c2b1 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -809,7 +809,7 @@ static int keyspan_pda_startup(struct usb_serial *serial)
         return 0;
 }
 
-static void keyspan_pda_shutdown(struct usb_serial *serial)
+static void keyspan_pda_release(struct usb_serial *serial)
 {
         dbg("%s", __func__);
 
@@ -869,7 +869,7 @@ static struct usb_serial_driver keyspan_pda_device = {
         .tiocmget =             keyspan_pda_tiocmget,
         .tiocmset =             keyspan_pda_tiocmset,
         .attach =               keyspan_pda_startup,
-        .shutdown =             keyspan_pda_shutdown,
+        .release =              keyspan_pda_release,
 };
 
 
diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
index fa817c66b3e8..0f44bb8e8d4f 100644
--- a/drivers/usb/serial/kl5kusb105.c
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -73,7 +73,8 @@ static int debug;
  * Function prototypes
  */
 static int  klsi_105_startup(struct usb_serial *serial);
-static void klsi_105_shutdown(struct usb_serial *serial);
+static void klsi_105_disconnect(struct usb_serial *serial);
+static void klsi_105_release(struct usb_serial *serial);
 static int  klsi_105_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp);
 static void klsi_105_close(struct usb_serial_port *port);
@@ -131,7 +132,8 @@ static struct usb_serial_driver kl5kusb105d_device = {
         .tiocmget =          klsi_105_tiocmget,
         .tiocmset =          klsi_105_tiocmset,
         .attach =            klsi_105_startup,
-        .shutdown =          klsi_105_shutdown,
+        .disconnect =        klsi_105_disconnect,
+        .release =           klsi_105_release,
         .throttle =          klsi_105_throttle,
         .unthrottle =        klsi_105_unthrottle,
 };
@@ -315,7 +317,7 @@ err_cleanup:
 } /* klsi_105_startup */
 
 
-static void klsi_105_shutdown(struct usb_serial *serial)
+static void klsi_105_disconnect(struct usb_serial *serial)
 {
         int i;
 
@@ -325,33 +327,36 @@ static void klsi_105_shutdown(struct usb_serial *serial)
         for (i = 0; i < serial->num_ports; ++i) {
                 struct klsi_105_private *priv =
                                 usb_get_serial_port_data(serial->port[i]);
-                unsigned long flags;
 
                 if (priv) {
                         /* kill our write urb pool */
                         int j;
                         struct urb **write_urbs = priv->write_urb_pool;
-                        spin_lock_irqsave(&priv->lock, flags);
 
                         for (j = 0; j < NUM_URBS; j++) {
                                 if (write_urbs[j]) {
-                                        /* FIXME - uncomment the following
-                                         * usb_kill_urb call when the host
-                                         * controllers get fixed to set
-                                         * urb->dev = NULL after the urb is
-                                         * finished.  Otherwise this call
-                                         * oopses. */
-                                        /* usb_kill_urb(write_urbs[j]); */
-                                        kfree(write_urbs[j]->transfer_buffer);
+                                        usb_kill_urb(write_urbs[j]);
                                         usb_free_urb(write_urbs[j]);
                                 }
                         }
-                        spin_unlock_irqrestore(&priv->lock, flags);
-                        kfree(priv);
-                        usb_set_serial_port_data(serial->port[i], NULL);
                 }
         }
-} /* klsi_105_shutdown */
+} /* klsi_105_disconnect */
+
+
+static void klsi_105_release(struct usb_serial *serial)
+{
+        int i;
+
+        dbg("%s", __func__);
+
+        for (i = 0; i < serial->num_ports; ++i) {
+                struct klsi_105_private *priv =
+                                usb_get_serial_port_data(serial->port[i]);
+
+                kfree(priv);
+        }
+} /* klsi_105_release */
 
 static int  klsi_105_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp)
diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index 6b570498287f..6db0e561f680 100644
--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -69,7 +69,7 @@ static int debug;
 
 /* Function prototypes */
 static int  kobil_startup(struct usb_serial *serial);
-static void kobil_shutdown(struct usb_serial *serial);
+static void kobil_release(struct usb_serial *serial);
 static int  kobil_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp);
 static void kobil_close(struct usb_serial_port *port);
@@ -117,7 +117,7 @@ static struct usb_serial_driver kobil_device = {
         .id_table =             id_table,
         .num_ports =            1,
         .attach =               kobil_startup,
-        .shutdown =             kobil_shutdown,
+        .release =              kobil_release,
         .ioctl =                kobil_ioctl,
         .set_termios =          kobil_set_termios,
         .tiocmget =             kobil_tiocmget,
@@ -201,17 +201,13 @@ static int kobil_startup(struct usb_serial *serial)
 }
 
 
-static void kobil_shutdown(struct usb_serial *serial)
+static void kobil_release(struct usb_serial *serial)
 {
         int i;
         dbg("%s - port %d", __func__, serial->port[0]->number);
 
-        for (i = 0; i < serial->num_ports; ++i) {
-                while (serial->port[i]->port.count > 0)
-                        kobil_close(serial->port[i]);
+        for (i = 0; i < serial->num_ports; ++i)
                 kfree(usb_get_serial_port_data(serial->port[i]));
-                usb_set_serial_port_data(serial->port[i], NULL);
-        }
 }
 
 
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index 873795548fc0..d8825e159aa5 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -92,7 +92,7 @@ static int debug;
  * Function prototypes
  */
 static int  mct_u232_startup(struct usb_serial *serial);
-static void mct_u232_shutdown(struct usb_serial *serial);
+static void mct_u232_release(struct usb_serial *serial);
 static int  mct_u232_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp);
 static void mct_u232_close(struct usb_serial_port *port);
@@ -149,7 +149,7 @@ static struct usb_serial_driver mct_u232_device = {
         .tiocmget =          mct_u232_tiocmget,
         .tiocmset =          mct_u232_tiocmset,
         .attach =            mct_u232_startup,
-        .shutdown =          mct_u232_shutdown,
+        .release =           mct_u232_release,
 };
 
 
@@ -407,7 +407,7 @@ static int mct_u232_startup(struct usb_serial *serial)
 } /* mct_u232_startup */
 
 
-static void mct_u232_shutdown(struct usb_serial *serial)
+static void mct_u232_release(struct usb_serial *serial)
 {
         struct mct_u232_private *priv;
         int i;
@@ -417,12 +417,9 @@ static void mct_u232_shutdown(struct usb_serial *serial)
         for (i = 0; i < serial->num_ports; ++i) {
                 /* My special items, the standard routines free my urbs */
                 priv = usb_get_serial_port_data(serial->port[i]);
-                if (priv) {
-                        usb_set_serial_port_data(serial->port[i], NULL);
-                        kfree(priv);
-                }
+                kfree(priv);
         }
-} /* mct_u232_shutdown */
+} /* mct_u232_release */
 
 static int  mct_u232_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp)
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 9e1a013ee7f6..bfc5ce000ef9 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -1521,19 +1521,16 @@ static int mos7720_startup(struct usb_serial *serial)
         return 0;
 }
 
-static void mos7720_shutdown(struct usb_serial *serial)
+static void mos7720_release(struct usb_serial *serial)
 {
         int i;
 
         /* free private structure allocated for serial port */
-        for (i = 0; i < serial->num_ports; ++i) {
+        for (i = 0; i < serial->num_ports; ++i)
                 kfree(usb_get_serial_port_data(serial->port[i]));
-                usb_set_serial_port_data(serial->port[i], NULL);
-        }
 
         /* free private structure allocated for serial device */
         kfree(usb_get_serial_data(serial));
-        usb_set_serial_data(serial, NULL);
 }
 
 static struct usb_driver usb_driver = {
@@ -1558,7 +1555,7 @@ static struct usb_serial_driver moschip7720_2port_driver = {
         .throttle               = mos7720_throttle,
         .unthrottle             = mos7720_unthrottle,
         .attach                 = mos7720_startup,
-        .shutdown               = mos7720_shutdown,
+        .release                = mos7720_release,
         .ioctl                  = mos7720_ioctl,
         .set_termios            = mos7720_set_termios,
         .write                  = mos7720_write,
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 10b78a37214f..c40f95c1951c 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -238,7 +238,7 @@ static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 {
         struct usb_device *dev = port->serial->dev;
         val = val & 0x00ff;
-        dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
+        dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 
         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
                                MCS_WR_RTYPE, val, reg, NULL, 0,
@@ -260,7 +260,7 @@ static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
                               MOS_WDR_TIMEOUT);
-        dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
+        dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
         *val = (*val) & 0x00ff;
         return ret;
 }
@@ -282,18 +282,18 @@ static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
         if (port->serial->num_ports == 4) {
                 val |= (((__u16) port->number -
                                 (__u16) (port->serial->minor)) + 1) << 8;
-                dbg("mos7840_set_uart_reg application number is %x\n", val);
+                dbg("mos7840_set_uart_reg application number is %x", val);
         } else {
                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
                         val |= (((__u16) port->number -
                               (__u16) (port->serial->minor)) + 1) << 8;
-                        dbg("mos7840_set_uart_reg application number is %x\n",
+                        dbg("mos7840_set_uart_reg application number is %x",
                             val);
                 } else {
                         val |=
                             (((__u16) port->number -
                               (__u16) (port->serial->minor)) + 2) << 8;
-                        dbg("mos7840_set_uart_reg application number is %x\n",
+                        dbg("mos7840_set_uart_reg application number is %x",
                             val);
                 }
         }
@@ -315,24 +315,24 @@ static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
         int ret = 0;
         __u16 Wval;
 
-        /* dbg("application number is %4x \n",
+        /* dbg("application number is %4x",
             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
         /* Wval  is same as application number */
         if (port->serial->num_ports == 4) {
                 Wval =
                     (((__u16) port->number - (__u16) (port->serial->minor)) +
                      1) << 8;
-                dbg("mos7840_get_uart_reg application number is %x\n", Wval);
+                dbg("mos7840_get_uart_reg application number is %x", Wval);
         } else {
                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
                         Wval = (((__u16) port->number -
                               (__u16) (port->serial->minor)) + 1) << 8;
-                        dbg("mos7840_get_uart_reg application number is %x\n",
+                        dbg("mos7840_get_uart_reg application number is %x",
                             Wval);
                 } else {
                         Wval = (((__u16) port->number -
                               (__u16) (port->serial->minor)) + 2) << 8;
-                        dbg("mos7840_get_uart_reg application number is %x\n",
+                        dbg("mos7840_get_uart_reg application number is %x",
                             Wval);
                 }
         }
@@ -346,11 +346,11 @@ static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 {
 
-        dbg("***************************************\n");
-        dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
-        dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
-        dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
-        dbg("***************************************\n");
+        dbg("***************************************");
+        dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
+        dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
+        dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
+        dbg("***************************************");
 
 }
 
@@ -474,12 +474,12 @@ static void mos7840_control_callback(struct urb *urb)
                 goto exit;
         }
 
-        dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
-        dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
+        dbg("%s urb buffer size is %d", __func__, urb->actual_length);
+        dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
             mos7840_port->MsrLsr, mos7840_port->port_num);
         data = urb->transfer_buffer;
         regval = (__u8) data[0];
-        dbg("%s data is %x\n", __func__, regval);
+        dbg("%s data is %x", __func__, regval);
         if (mos7840_port->MsrLsr == 0)
                 mos7840_handle_new_msr(mos7840_port, regval);
         else if (mos7840_port->MsrLsr == 1)
@@ -538,7 +538,7 @@ static void mos7840_interrupt_callback(struct urb *urb)
         __u16 wval, wreg = 0;
         int status = urb->status;
 
-        dbg("%s", " : Entering\n");
+        dbg("%s", " : Entering");
 
         switch (status) {
         case 0:
@@ -570,7 +570,7 @@ static void mos7840_interrupt_callback(struct urb *urb)
          * Byte 5 FIFO status for both */
 
         if (length && length > 5) {
-                dbg("%s \n", "Wrong data !!!");
+                dbg("%s", "Wrong data !!!");
                 return;
         }
 
@@ -587,17 +587,17 @@ static void mos7840_interrupt_callback(struct urb *urb)
                       (__u16) (serial->minor)) + 1) << 8;
                 if (mos7840_port->open) {
                         if (sp[i] & 0x01) {
-                                dbg("SP%d No Interrupt !!!\n", i);
+                                dbg("SP%d No Interrupt !!!", i);
                         } else {
                                 switch (sp[i] & 0x0f) {
                                 case SERIAL_IIR_RLS:
                                         dbg("Serial Port %d: Receiver status error or ", i);
-                                        dbg("address bit detected in 9-bit mode\n");
+                                        dbg("address bit detected in 9-bit mode");
                                         mos7840_port->MsrLsr = 1;
                                         wreg = LINE_STATUS_REGISTER;
                                         break;
                                 case SERIAL_IIR_MS:
-                                        dbg("Serial Port %d: Modem status change\n", i);
+                                        dbg("Serial Port %d: Modem status change", i);
                                         mos7840_port->MsrLsr = 0;
                                         wreg = MODEM_STATUS_REGISTER;
                                         break;
@@ -689,7 +689,7 @@ static void mos7840_bulk_in_callback(struct urb *urb)
 
         mos7840_port = urb->context;
         if (!mos7840_port) {
-                dbg("%s", "NULL mos7840_port pointer \n");
+                dbg("%s", "NULL mos7840_port pointer");
                 mos7840_port->read_urb_busy = false;
                 return;
         }
@@ -702,41 +702,41 @@ static void mos7840_bulk_in_callback(struct urb *urb)
 
         port = (struct usb_serial_port *)mos7840_port->port;
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Port Paranoia failed \n");
+                dbg("%s", "Port Paranoia failed");
                 mos7840_port->read_urb_busy = false;
                 return;
         }
 
         serial = mos7840_get_usb_serial(port, __func__);
         if (!serial) {
-                dbg("%s\n", "Bad serial pointer ");
+                dbg("%s", "Bad serial pointer");
                 mos7840_port->read_urb_busy = false;
                 return;
         }
 
-        dbg("%s\n", "Entering... \n");
+        dbg("%s", "Entering... ");
 
         data = urb->transfer_buffer;
 
-        dbg("%s", "Entering ........... \n");
+        dbg("%s", "Entering ...........");
 
         if (urb->actual_length) {
                 tty = tty_port_tty_get(&mos7840_port->port->port);
                 if (tty) {
                         tty_buffer_request_room(tty, urb->actual_length);
                         tty_insert_flip_string(tty, data, urb->actual_length);
-                        dbg(" %s \n", data);
+                        dbg(" %s ", data);
                         tty_flip_buffer_push(tty);
                         tty_kref_put(tty);
                 }
                 mos7840_port->icount.rx += urb->actual_length;
                 smp_wmb();
-                dbg("mos7840_port->icount.rx is %d:\n",
+                dbg("mos7840_port->icount.rx is %d:",
                     mos7840_port->icount.rx);
         }
 
         if (!mos7840_port->read_urb) {
-                dbg("%s", "URB KILLED !!!\n");
+                dbg("%s", "URB KILLED !!!");
                 mos7840_port->read_urb_busy = false;
                 return;
         }
@@ -777,16 +777,16 @@ static void mos7840_bulk_out_data_callback(struct urb *urb)
         spin_unlock(&mos7840_port->pool_lock);
 
         if (status) {
-                dbg("nonzero write bulk status received:%d\n", status);
+                dbg("nonzero write bulk status received:%d", status);
                 return;
         }
 
         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
-                dbg("%s", "Port Paranoia failed \n");
+                dbg("%s", "Port Paranoia failed");
                 return;
         }
 
-        dbg("%s \n", "Entering .........");
+        dbg("%s", "Entering .........");
 
         tty = tty_port_tty_get(&mos7840_port->port->port);
         if (tty && mos7840_port->open)
@@ -830,15 +830,17 @@ static int mos7840_open(struct tty_struct *tty,
         struct moschip_port *mos7840_port;
         struct moschip_port *port0;
 
+        dbg ("%s enter", __func__);
+
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Port Paranoia failed \n");
+                dbg("%s", "Port Paranoia failed");
                 return -ENODEV;
         }
 
         serial = port->serial;
 
         if (mos7840_serial_paranoia_check(serial, __func__)) {
-                dbg("%s", "Serial Paranoia failed \n");
+                dbg("%s", "Serial Paranoia failed");
                 return -ENODEV;
         }
 
@@ -891,20 +893,20 @@ static int mos7840_open(struct tty_struct *tty,
         Data = 0x0;
         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
         if (status < 0) {
-                dbg("Reading Spreg failed\n");
+                dbg("Reading Spreg failed");
                 return -1;
         }
         Data |= 0x80;
         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
         if (status < 0) {
-                dbg("writing Spreg failed\n");
+                dbg("writing Spreg failed");
                 return -1;
         }
 
         Data &= ~0x80;
         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
         if (status < 0) {
-                dbg("writing Spreg failed\n");
+                dbg("writing Spreg failed");
                 return -1;
         }
         /* End of block to be checked */
@@ -913,7 +915,7 @@ static int mos7840_open(struct tty_struct *tty,
         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
                                                                         &Data);
         if (status < 0) {
-                dbg("Reading Controlreg failed\n");
+                dbg("Reading Controlreg failed");
                 return -1;
         }
         Data |= 0x08;           /* Driver done bit */
@@ -921,7 +923,7 @@ static int mos7840_open(struct tty_struct *tty,
         status = mos7840_set_reg_sync(port,
                                 mos7840_port->ControlRegOffset, Data);
         if (status < 0) {
-                dbg("writing Controlreg failed\n");
+                dbg("writing Controlreg failed");
                 return -1;
         }
         /* do register settings here */
@@ -932,21 +934,21 @@ static int mos7840_open(struct tty_struct *tty,
         Data = 0x00;
         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
         if (status < 0) {
-                dbg("disableing interrupts failed\n");
+                dbg("disabling interrupts failed");
                 return -1;
         }
         /* Set FIFO_CONTROL_REGISTER to the default value */
         Data = 0x00;
         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
         if (status < 0) {
-                dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
+                dbg("Writing FIFO_CONTROL_REGISTER  failed");
                 return -1;
         }
 
         Data = 0xcf;
         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
         if (status < 0) {
-                dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
+                dbg("Writing FIFO_CONTROL_REGISTER  failed");
                 return -1;
         }
 
@@ -1043,12 +1045,12 @@ static int mos7840_open(struct tty_struct *tty,
          * (can't set it up in mos7840_startup as the  *
          * structures were not set up at that time.)   */
 
-        dbg("port number is %d \n", port->number);
-        dbg("serial number is %d \n", port->serial->minor);
-        dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
-        dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
-        dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
-        dbg("port's number in the device is %d\n", mos7840_port->port_num);
+        dbg("port number is %d", port->number);
+        dbg("serial number is %d", port->serial->minor);
+        dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
+        dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
+        dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
+        dbg("port's number in the device is %d", mos7840_port->port_num);
         mos7840_port->read_urb = port->read_urb;
 
         /* set up our bulk in urb */
@@ -1061,7 +1063,7 @@ static int mos7840_open(struct tty_struct *tty,
                           mos7840_port->read_urb->transfer_buffer_length,
                           mos7840_bulk_in_callback, mos7840_port);
 
-        dbg("mos7840_open: bulkin endpoint is %d\n",
+        dbg("mos7840_open: bulkin endpoint is %d",
             port->bulk_in_endpointAddress);
         mos7840_port->read_urb_busy = true;
         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
@@ -1087,9 +1089,11 @@ static int mos7840_open(struct tty_struct *tty,
         mos7840_port->icount.tx = 0;
         mos7840_port->icount.rx = 0;
 
-        dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n",
+        dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
                                 serial, mos7840_port, port);
 
+        dbg ("%s leave", __func__);
+
         return 0;
 
 }
@@ -1112,16 +1116,16 @@ static int mos7840_chars_in_buffer(struct tty_struct *tty)
         unsigned long flags;
         struct moschip_port *mos7840_port;
 
-        dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
+        dbg("%s", " mos7840_chars_in_buffer:entering ...........");
 
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Invalid port \n");
+                dbg("%s", "Invalid port");
                 return 0;
         }
 
         mos7840_port = mos7840_get_port_private(port);
         if (mos7840_port == NULL) {
-                dbg("%s \n", "mos7840_break:leaving ...........");
+                dbg("%s", "mos7840_break:leaving ...........");
                 return 0;
         }
 
@@ -1148,16 +1152,16 @@ static void mos7840_close(struct usb_serial_port *port)
         int j;
         __u16 Data;
 
-        dbg("%s\n", "mos7840_close:entering...");
+        dbg("%s", "mos7840_close:entering...");
 
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Port Paranoia failed \n");
+                dbg("%s", "Port Paranoia failed");
                 return;
         }
 
         serial = mos7840_get_usb_serial(port, __func__);
         if (!serial) {
-                dbg("%s", "Serial Paranoia failed \n");
+                dbg("%s", "Serial Paranoia failed");
                 return;
         }
 
@@ -1185,27 +1189,27 @@ static void mos7840_close(struct usb_serial_port *port)
          * and interrupt read if they exists                  */
         if (serial->dev) {
                 if (mos7840_port->write_urb) {
-                        dbg("%s", "Shutdown bulk write\n");
+                        dbg("%s", "Shutdown bulk write");
                         usb_kill_urb(mos7840_port->write_urb);
                 }
                 if (mos7840_port->read_urb) {
-                        dbg("%s", "Shutdown bulk read\n");
+                        dbg("%s", "Shutdown bulk read");
                         usb_kill_urb(mos7840_port->read_urb);
                         mos7840_port->read_urb_busy = false;
                 }
                 if ((&mos7840_port->control_urb)) {
-                        dbg("%s", "Shutdown control read\n");
+                        dbg("%s", "Shutdown control read");
                         /*/      usb_kill_urb (mos7840_port->control_urb); */
                 }
         }
 /*      if(mos7840_port->ctrl_buf != NULL) */
 /*              kfree(mos7840_port->ctrl_buf); */
         port0->open_ports--;
-        dbg("mos7840_num_open_ports in close%d:in port%d\n",
+        dbg("mos7840_num_open_ports in close%d:in port%d",
             port0->open_ports, port->number);
         if (port0->open_ports == 0) {
                 if (serial->port[0]->interrupt_in_urb) {
-                        dbg("%s", "Shutdown interrupt_in_urb\n");
+                        dbg("%s", "Shutdown interrupt_in_urb");
                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
                 }
         }
@@ -1225,7 +1229,7 @@ static void mos7840_close(struct usb_serial_port *port)
 
         mos7840_port->open = 0;
 
-        dbg("%s \n", "Leaving ............");
+        dbg("%s", "Leaving ............");
 }
 
 /************************************************************************
@@ -1280,17 +1284,17 @@ static void mos7840_break(struct tty_struct *tty, int break_state)
         struct usb_serial *serial;
         struct moschip_port *mos7840_port;
 
-        dbg("%s \n", "Entering ...........");
-        dbg("mos7840_break: Start\n");
+        dbg("%s", "Entering ...........");
+        dbg("mos7840_break: Start");
 
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Port Paranoia failed \n");
+                dbg("%s", "Port Paranoia failed");
                 return;
         }
 
         serial = mos7840_get_usb_serial(port, __func__);
         if (!serial) {
-                dbg("%s", "Serial Paranoia failed \n");
+                dbg("%s", "Serial Paranoia failed");
                 return;
         }
 
@@ -1310,7 +1314,7 @@ static void mos7840_break(struct tty_struct *tty, int break_state)
 
         /* FIXME: no locking on shadowLCR anywhere in driver */
         mos7840_port->shadowLCR = data;
-        dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
+        dbg("mcs7840_break mos7840_port->shadowLCR is %x",
             mos7840_port->shadowLCR);
         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
                              mos7840_port->shadowLCR);
@@ -1334,17 +1338,17 @@ static int mos7840_write_room(struct tty_struct *tty)
         unsigned long flags;
         struct moschip_port *mos7840_port;
 
-        dbg("%s \n", " mos7840_write_room:entering ...........");
+        dbg("%s", " mos7840_write_room:entering ...........");
 
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Invalid port \n");
-                dbg("%s \n", " mos7840_write_room:leaving ...........");
+                dbg("%s", "Invalid port");
+                dbg("%s", " mos7840_write_room:leaving ...........");
                 return -1;
         }
 
         mos7840_port = mos7840_get_port_private(port);
         if (mos7840_port == NULL) {
-                dbg("%s \n", "mos7840_break:leaving ...........");
+                dbg("%s", "mos7840_break:leaving ...........");
                 return -1;
         }
 
@@ -1384,16 +1388,16 @@ static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
         /* __u16 Data; */
         const unsigned char *current_position = data;
         unsigned char *data1;
-        dbg("%s \n", "entering ...........");
-        /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
+        dbg("%s", "entering ...........");
+        /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
                                         mos7840_port->shadowLCR); */
 
 #ifdef NOTMOS7840
         Data = 0x00;
         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
         mos7840_port->shadowLCR = Data;
-        dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
-        dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
+        dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
+        dbg("mos7840_write: mos7840_port->shadowLCR is %x",
             mos7840_port->shadowLCR);
 
         /* Data = 0x03; */
@@ -1407,32 +1411,32 @@ static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
         Data = 0x00;
         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
-        dbg("mos7840_write:DLL value is %x\n", Data);
+        dbg("mos7840_write:DLL value is %x", Data);
 
         Data = 0x0;
         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
-        dbg("mos7840_write:DLM value is %x\n", Data);
+        dbg("mos7840_write:DLM value is %x", Data);
 
         Data = Data & ~SERIAL_LCR_DLAB;
-        dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
+        dbg("mos7840_write: mos7840_port->shadowLCR is %x",
             mos7840_port->shadowLCR);
         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 #endif
 
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Port Paranoia failed \n");
+                dbg("%s", "Port Paranoia failed");
                 return -1;
         }
 
         serial = port->serial;
         if (mos7840_serial_paranoia_check(serial, __func__)) {
-                dbg("%s", "Serial Paranoia failed \n");
+                dbg("%s", "Serial Paranoia failed");
                 return -1;
         }
 
         mos7840_port = mos7840_get_port_private(port);
         if (mos7840_port == NULL) {
-                dbg("%s", "mos7840_port is NULL\n");
+                dbg("%s", "mos7840_port is NULL");
                 return -1;
         }
 
@@ -1444,7 +1448,7 @@ static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
                 if (!mos7840_port->busy[i]) {
                         mos7840_port->busy[i] = 1;
                         urb = mos7840_port->write_urb_pool[i];
-                        dbg("\nURB:%d", i);
+                        dbg("URB:%d", i);
                         break;
                 }
         }
@@ -1479,7 +1483,7 @@ static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
                           mos7840_bulk_out_data_callback, mos7840_port);
 
         data1 = urb->transfer_buffer;
-        dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
+        dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
 
         /* send it down the pipe */
         status = usb_submit_urb(urb, GFP_ATOMIC);
@@ -1494,7 +1498,7 @@ static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
         bytes_sent = transfer_size;
         mos7840_port->icount.tx += transfer_size;
         smp_wmb();
-        dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
+        dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
 exit:
         return bytes_sent;
 
@@ -1513,11 +1517,11 @@ static void mos7840_throttle(struct tty_struct *tty)
         int status;
 
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Invalid port \n");
+                dbg("%s", "Invalid port");
                 return;
         }
 
-        dbg("- port %d\n", port->number);
+        dbg("- port %d", port->number);
 
         mos7840_port = mos7840_get_port_private(port);
 
@@ -1525,11 +1529,11 @@ static void mos7840_throttle(struct tty_struct *tty)
                 return;
 
         if (!mos7840_port->open) {
-                dbg("%s\n", "port not opened");
+                dbg("%s", "port not opened");
                 return;
         }
 
-        dbg("%s", "Entering .......... \n");
+        dbg("%s", "Entering ..........");
 
         /* if we are implementing XON/XOFF, send the stop character */
         if (I_IXOFF(tty)) {
@@ -1563,7 +1567,7 @@ static void mos7840_unthrottle(struct tty_struct *tty)
         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
 
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Invalid port \n");
+                dbg("%s", "Invalid port");
                 return;
         }
 
@@ -1575,7 +1579,7 @@ static void mos7840_unthrottle(struct tty_struct *tty)
                 return;
         }
 
-        dbg("%s", "Entering .......... \n");
+        dbg("%s", "Entering ..........");
 
         /* if we are implementing XON/XOFF, send the start character */
         if (I_IXOFF(tty)) {
@@ -1660,7 +1664,7 @@ static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
 
         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
         if (status < 0) {
-                dbg("setting MODEM_CONTROL_REGISTER Failed\n");
+                dbg("setting MODEM_CONTROL_REGISTER Failed");
                 return status;
         }
 
@@ -1729,11 +1733,11 @@ static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
                         custom++;
                 *divisor = custom;
 
-                dbg(" Baud %d = %d\n", baudrate, custom);
+                dbg(" Baud %d = %d", baudrate, custom);
                 return 0;
         }
 
-        dbg("%s\n", " Baud calculation Failed...");
+        dbg("%s", " Baud calculation Failed...");
         return -1;
 #endif
 }
@@ -1759,16 +1763,16 @@ static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
 
         port = (struct usb_serial_port *)mos7840_port->port;
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Invalid port \n");
+                dbg("%s", "Invalid port");
                 return -1;
         }
 
         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
-                dbg("%s", "Invalid Serial \n");
+                dbg("%s", "Invalid Serial");
                 return -1;
         }
 
-        dbg("%s", "Entering .......... \n");
+        dbg("%s", "Entering ..........");
 
         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
 
@@ -1784,7 +1788,7 @@ static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
                                                                         Data);
                 if (status < 0) {
-                        dbg("Writing spreg failed in set_serial_baud\n");
+                        dbg("Writing spreg failed in set_serial_baud");
                         return -1;
                 }
 #endif
@@ -1797,7 +1801,7 @@ static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
                                                                         Data);
                 if (status < 0) {
-                        dbg("Writing spreg failed in set_serial_baud\n");
+                        dbg("Writing spreg failed in set_serial_baud");
                         return -1;
                 }
 #endif
@@ -1812,14 +1816,14 @@ static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
                                                                  &Data);
                 if (status < 0) {
-                        dbg("reading spreg failed in set_serial_baud\n");
+                        dbg("reading spreg failed in set_serial_baud");
                         return -1;
                 }
                 Data = (Data & 0x8f) | clk_sel_val;
                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
                                                                 Data);
                 if (status < 0) {
-                        dbg("Writing spreg failed in set_serial_baud\n");
+                        dbg("Writing spreg failed in set_serial_baud");
                         return -1;
                 }
                 /* Calculate the Divisor */
@@ -1835,11 +1839,11 @@ static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
 
                 /* Write the divisor */
                 Data = (unsigned char)(divisor & 0xff);
-                dbg("set_serial_baud Value to write DLL is %x\n", Data);
+                dbg("set_serial_baud Value to write DLL is %x", Data);
                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 
                 Data = (unsigned char)((divisor & 0xff00) >> 8);
-                dbg("set_serial_baud Value to write DLM is %x\n", Data);
+                dbg("set_serial_baud Value to write DLM is %x", Data);
                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 
                 /* Disable access to divisor latch */
@@ -1877,12 +1881,12 @@ static void mos7840_change_port_settings(struct tty_struct *tty,
         port = (struct usb_serial_port *)mos7840_port->port;
 
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Invalid port \n");
+                dbg("%s", "Invalid port");
                 return;
         }
 
         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
-                dbg("%s", "Invalid Serial \n");
+                dbg("%s", "Invalid Serial");
                 return;
         }
 
@@ -1895,7 +1899,7 @@ static void mos7840_change_port_settings(struct tty_struct *tty,
                 return;
         }
 
-        dbg("%s", "Entering .......... \n");
+        dbg("%s", "Entering ..........");
 
         lData = LCR_BITS_8;
         lStop = LCR_STOP_1;
@@ -1955,7 +1959,7 @@ static void mos7840_change_port_settings(struct tty_struct *tty,
             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
         mos7840_port->shadowLCR |= (lData | lParity | lStop);
 
-        dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
+        dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
             mos7840_port->shadowLCR);
         /* Disable Interrupts */
         Data = 0x00;
@@ -1997,7 +2001,7 @@ static void mos7840_change_port_settings(struct tty_struct *tty,
 
         if (!baud) {
                 /* pick a default, any default... */
-                dbg("%s\n", "Picked default baud...");
+                dbg("%s", "Picked default baud...");
                 baud = 9600;
         }
 
@@ -2020,7 +2024,7 @@ static void mos7840_change_port_settings(struct tty_struct *tty,
         }
         wake_up(&mos7840_port->delta_msr_wait);
         mos7840_port->delta_msr_cond = 1;
-        dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
+        dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
             mos7840_port->shadowLCR);
 
         return;
@@ -2040,16 +2044,16 @@ static void mos7840_set_termios(struct tty_struct *tty,
         unsigned int cflag;
         struct usb_serial *serial;
         struct moschip_port *mos7840_port;
-        dbg("mos7840_set_termios: START\n");
+        dbg("mos7840_set_termios: START");
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Invalid port \n");
+                dbg("%s", "Invalid port");
                 return;
         }
 
         serial = port->serial;
 
         if (mos7840_serial_paranoia_check(serial, __func__)) {
-                dbg("%s", "Invalid Serial \n");
+                dbg("%s", "Invalid Serial");
                 return;
         }
 
@@ -2063,7 +2067,7 @@ static void mos7840_set_termios(struct tty_struct *tty,
                 return;
         }
 
-        dbg("%s\n", "setting termios - ");
+        dbg("%s", "setting termios - ");
 
         cflag = tty->termios->c_cflag;
 
@@ -2078,7 +2082,7 @@ static void mos7840_set_termios(struct tty_struct *tty,
         mos7840_change_port_settings(tty, mos7840_port, old_termios);
 
         if (!mos7840_port->read_urb) {
-                dbg("%s", "URB KILLED !!!!!\n");
+                dbg("%s", "URB KILLED !!!!!");
                 return;
         }
 
@@ -2144,7 +2148,7 @@ static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
 
         port = (struct usb_serial_port *)mos7840_port->port;
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Invalid port \n");
+                dbg("%s", "Invalid port");
                 return -1;
         }
 
@@ -2189,7 +2193,7 @@ static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
         unlock_kernel();
         if (status < 0) {
-                dbg("setting MODEM_CONTROL_REGISTER Failed\n");
+                dbg("setting MODEM_CONTROL_REGISTER Failed");
                 return -1;
         }
 
@@ -2274,7 +2278,7 @@ static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
         int mosret = 0;
 
         if (mos7840_port_paranoia_check(port, __func__)) {
-                dbg("%s", "Invalid port \n");
+                dbg("%s", "Invalid port");
                 return -1;
         }
 
@@ -2374,9 +2378,8 @@ static int mos7840_calc_num_ports(struct usb_serial *serial)
 {
         int mos7840_num_ports = 0;
 
-        dbg("numberofendpoints: %d \n",
-            (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
-        dbg("numberofendpoints: %d \n",
+        dbg("numberofendpoints: cur %d, alt %d",
+            (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
             (int)serial->interface->altsetting->desc.bNumEndpoints);
         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
                 mos7840_num_ports = serial->num_ports = 2;
@@ -2385,7 +2388,7 @@ static int mos7840_calc_num_ports(struct usb_serial *serial)
                 serial->num_bulk_out = 4;
                 mos7840_num_ports = serial->num_ports = 4;
         }
-
+        dbg ("mos7840_num_ports = %d", mos7840_num_ports);
         return mos7840_num_ports;
 }
 
@@ -2400,22 +2403,24 @@ static int mos7840_startup(struct usb_serial *serial)
         int i, status;
 
         __u16 Data;
-        dbg("%s \n", " mos7840_startup :entering..........");
+        dbg("%s", "mos7840_startup :Entering..........");
 
         if (!serial) {
-                dbg("%s\n", "Invalid Handler");
+                dbg("%s", "Invalid Handler");
                 return -1;
         }
 
         dev = serial->dev;
 
-        dbg("%s\n", "Entering...");
+        dbg("%s", "Entering...");
+        dbg ("mos7840_startup: serial = %p", serial);
 
         /* we set up the pointers to the endpoints in the mos7840_open *
          * function, as the structures aren't created yet.             */
 
         /* set up port private structures */
         for (i = 0; i < serial->num_ports; ++i) {
+                dbg ("mos7840_startup: configuring port %d............", i);
                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
                 if (mos7840_port == NULL) {
                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
@@ -2473,10 +2478,10 @@ static int mos7840_startup(struct usb_serial *serial)
                 status = mos7840_get_reg_sync(serial->port[i],
                                  mos7840_port->ControlRegOffset, &Data);
                 if (status < 0) {
-                        dbg("Reading ControlReg failed status-0x%x\n", status);
+                        dbg("Reading ControlReg failed status-0x%x", status);
                         break;
                 } else
-                        dbg("ControlReg Reading success val is %x, status%d\n",
+                        dbg("ControlReg Reading success val is %x, status%d",
                             Data, status);
                 Data |= 0x08;   /* setting driver done bit */
                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
@@ -2486,10 +2491,10 @@ static int mos7840_startup(struct usb_serial *serial)
                 status = mos7840_set_reg_sync(serial->port[i],
                                          mos7840_port->ControlRegOffset, Data);
                 if (status < 0) {
-                        dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
+                        dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
                         break;
                 } else
-                        dbg("ControlReg Writing success(rx_disable) status%d\n",
+                        dbg("ControlReg Writing success(rx_disable) status%d",
                             status);
 
                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
@@ -2498,48 +2503,48 @@ static int mos7840_startup(struct usb_serial *serial)
                 status = mos7840_set_reg_sync(serial->port[i],
                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
                 if (status < 0) {
-                        dbg("Writing DCR0 failed status-0x%x\n", status);
+                        dbg("Writing DCR0 failed status-0x%x", status);
                         break;
                 } else
-                        dbg("DCR0 Writing success status%d\n", status);
+                        dbg("DCR0 Writing success status%d", status);
 
                 Data = 0x05;
                 status = mos7840_set_reg_sync(serial->port[i],
                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
                 if (status < 0) {
-                        dbg("Writing DCR1 failed status-0x%x\n", status);
+                        dbg("Writing DCR1 failed status-0x%x", status);
                         break;
                 } else
-                        dbg("DCR1 Writing success status%d\n", status);
+                        dbg("DCR1 Writing success status%d", status);
 
                 Data = 0x24;
                 status = mos7840_set_reg_sync(serial->port[i],
                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
                 if (status < 0) {
-                        dbg("Writing DCR2 failed status-0x%x\n", status);
+                        dbg("Writing DCR2 failed status-0x%x", status);
                         break;
                 } else
-                        dbg("DCR2 Writing success status%d\n", status);
+                        dbg("DCR2 Writing success status%d", status);
 
                 /* write values in clkstart0x0 and clkmulti 0x20 */
                 Data = 0x0;
                 status = mos7840_set_reg_sync(serial->port[i],
                                          CLK_START_VALUE_REGISTER, Data);
                 if (status < 0) {
-                        dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
+                        dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
                         break;
                 } else
-                        dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
+                        dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
 
                 Data = 0x20;
                 status = mos7840_set_reg_sync(serial->port[i],
                                         CLK_MULTI_REGISTER, Data);
                 if (status < 0) {
-                        dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
+                        dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
                             status);
                         goto error;
                 } else
-                        dbg("CLK_MULTI_REGISTER Writing success status%d\n",
+                        dbg("CLK_MULTI_REGISTER Writing success status%d",
                             status);
 
                 /* write value 0x0 to scratchpad register */
@@ -2547,11 +2552,11 @@ static int mos7840_startup(struct usb_serial *serial)
                 status = mos7840_set_uart_reg(serial->port[i],
                                                 SCRATCH_PAD_REGISTER, Data);
                 if (status < 0) {
-                        dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
+                        dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
                             status);
                         break;
                 } else
-                        dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
+                        dbg("SCRATCH_PAD_REGISTER Writing success status%d",
                             status);
 
                 /* Zero Length flag register */
@@ -2562,30 +2567,30 @@ static int mos7840_startup(struct usb_serial *serial)
                         status = mos7840_set_reg_sync(serial->port[i],
                                       (__u16) (ZLP_REG1 +
                                       ((__u16)mos7840_port->port_num)), Data);
-                        dbg("ZLIP offset%x\n",
+                        dbg("ZLIP offset %x",
                             (__u16) (ZLP_REG1 +
                                         ((__u16) mos7840_port->port_num)));
                         if (status < 0) {
-                                dbg("Writing ZLP_REG%d failed status-0x%x\n",
+                                dbg("Writing ZLP_REG%d failed status-0x%x",
                                     i + 2, status);
                                 break;
                         } else
-                                dbg("ZLP_REG%d Writing success status%d\n",
+                                dbg("ZLP_REG%d Writing success status%d",
                                     i + 2, status);
                 } else {
                         Data = 0xff;
                         status = mos7840_set_reg_sync(serial->port[i],
                               (__u16) (ZLP_REG1 +
                               ((__u16)mos7840_port->port_num) - 0x1), Data);
-                        dbg("ZLIP offset%x\n",
+                        dbg("ZLIP offset %x",
                             (__u16) (ZLP_REG1 +
                                      ((__u16) mos7840_port->port_num) - 0x1));
                         if (status < 0) {
-                                dbg("Writing ZLP_REG%d failed status-0x%x\n",
+                                dbg("Writing ZLP_REG%d failed status-0x%x",
                                     i + 1, status);
                                 break;
                         } else
-                                dbg("ZLP_REG%d Writing success status%d\n",
+                                dbg("ZLP_REG%d Writing success status%d",
                                     i + 1, status);
 
                 }
@@ -2599,15 +2604,16 @@ static int mos7840_startup(struct usb_serial *serial)
                         goto error;
                 }
         }
+        dbg ("mos7840_startup: all ports configured...........");
 
         /* Zero Length flag enable */
         Data = 0x0f;
         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
         if (status < 0) {
-                dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
+                dbg("Writing ZLP_REG5 failed status-0x%x", status);
                 goto error;
         } else
-                dbg("ZLP_REG5 Writing success status%d\n", status);
+                dbg("ZLP_REG5 Writing success status%d", status);
 
         /* setting configuration feature to one */
         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
@@ -2627,19 +2633,19 @@ error:
 }
 
 /****************************************************************************
- * mos7840_shutdown
+ * mos7840_disconnect
  *      This function is called whenever the device is removed from the usb bus.
  ****************************************************************************/
 
-static void mos7840_shutdown(struct usb_serial *serial)
+static void mos7840_disconnect(struct usb_serial *serial)
 {
         int i;
         unsigned long flags;
         struct moschip_port *mos7840_port;
-        dbg("%s \n", " shutdown :entering..........");
+        dbg("%s", " disconnect :entering..........");
 
         if (!serial) {
-                dbg("%s", "Invalid Handler \n");
+                dbg("%s", "Invalid Handler");
                 return;
         }
 
@@ -2656,14 +2662,45 @@ static void mos7840_shutdown(struct usb_serial *serial)
                         mos7840_port->zombie = 1;
                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
                         usb_kill_urb(mos7840_port->control_urb);
+                }
+        }
+
+        dbg("%s", "Thank u :: ");
+
+}
+
+/****************************************************************************
+ * mos7840_release
+ *      This function is called when the usb_serial structure is freed.
+ ****************************************************************************/
+
+static void mos7840_release(struct usb_serial *serial)
+{
+        int i;
+        struct moschip_port *mos7840_port;
+        dbg("%s", " release :entering..........");
+
+        if (!serial) {
+                dbg("%s", "Invalid Handler");
+                return;
+        }
+
+        /* check for the ports to be closed,close the ports and disconnect */
+
+        /* free private structure allocated for serial port  *
+         * stop reads and writes on all ports                */
+
+        for (i = 0; i < serial->num_ports; ++i) {
+                mos7840_port = mos7840_get_port_private(serial->port[i]);
+                dbg("mos7840_port %d = %p", i, mos7840_port);
+                if (mos7840_port) {
                         kfree(mos7840_port->ctrl_buf);
                         kfree(mos7840_port->dr);
                         kfree(mos7840_port);
                 }
-                mos7840_set_port_private(serial->port[i], NULL);
         }
 
-        dbg("%s\n", "Thank u :: ");
+        dbg("%s", "Thank u :: ");
 
 }
 
@@ -2701,7 +2738,8 @@ static struct usb_serial_driver moschip7840_4port_device = {
         .tiocmget = mos7840_tiocmget,
         .tiocmset = mos7840_tiocmset,
         .attach = mos7840_startup,
-        .shutdown = mos7840_shutdown,
+        .disconnect = mos7840_disconnect,
+        .release = mos7840_release,
         .read_bulk_callback = mos7840_bulk_in_callback,
         .read_int_callback = mos7840_interrupt_callback,
 };
@@ -2714,7 +2752,7 @@ static int __init moschip7840_init(void)
 {
         int retval;
 
-        dbg("%s \n", " mos7840_init :entering..........");
+        dbg("%s", " mos7840_init :entering..........");
 
         /* Register with the usb serial */
         retval = usb_serial_register(&moschip7840_4port_device);
@@ -2722,14 +2760,14 @@ static int __init moschip7840_init(void)
         if (retval)
                 goto failed_port_device_register;
 
-        dbg("%s\n", "Entring...");
+        dbg("%s", "Entering...");
         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
                DRIVER_DESC "\n");
 
         /* Register with the usb */
         retval = usb_register(&io_driver);
         if (retval == 0) {
-                dbg("%s\n", "Leaving...");
+                dbg("%s", "Leaving...");
                 return 0;
         }
         usb_serial_deregister(&moschip7840_4port_device);
@@ -2744,13 +2782,13 @@ failed_port_device_register:
 static void __exit moschip7840_exit(void)
 {
 
-        dbg("%s \n", " mos7840_exit :entering..........");
+        dbg("%s", " mos7840_exit :entering..........");
 
         usb_deregister(&io_driver);
 
         usb_serial_deregister(&moschip7840_4port_device);
 
-        dbg("%s\n", "Entring...");
+        dbg("%s", "Entering...");
 }
 
 module_init(moschip7840_init);
diff --git a/drivers/usb/serial/omninet.c b/drivers/usb/serial/omninet.c
index 1104617334f5..56857ddbd70b 100644
--- a/drivers/usb/serial/omninet.c
+++ b/drivers/usb/serial/omninet.c
@@ -72,7 +72,8 @@ static void omninet_write_bulk_callback(struct urb *urb);
 static int  omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
                                 const unsigned char *buf, int count);
 static int  omninet_write_room(struct tty_struct *tty);
-static void omninet_shutdown(struct usb_serial *serial);
+static void omninet_disconnect(struct usb_serial *serial);
+static void omninet_release(struct usb_serial *serial);
 static int omninet_attach(struct usb_serial *serial);
 
 static struct usb_device_id id_table[] = {
@@ -108,7 +109,8 @@ static struct usb_serial_driver zyxel_omninet_device = {
         .write_room =           omninet_write_room,
         .read_bulk_callback =   omninet_read_bulk_callback,
         .write_bulk_callback =  omninet_write_bulk_callback,
-        .shutdown =             omninet_shutdown,
+        .disconnect =           omninet_disconnect,
+        .release =              omninet_release,
 };
 
 
@@ -345,13 +347,22 @@ static void omninet_write_bulk_callback(struct urb *urb)
 }
 
 
-static void omninet_shutdown(struct usb_serial *serial)
+static void omninet_disconnect(struct usb_serial *serial)
 {
         struct usb_serial_port *wport = serial->port[1];
-        struct usb_serial_port *port = serial->port[0];
+
         dbg("%s", __func__);
 
         usb_kill_urb(wport->write_urb);
+}
+
+
+static void omninet_release(struct usb_serial *serial)
+{
+        struct usb_serial_port *port = serial->port[0];
+
+        dbg("%s", __func__);
+
         kfree(usb_get_serial_port_data(port));
 }
 
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index c20480aa9755..336bba79ad32 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -463,7 +463,7 @@ error:
         return retval;
 }
 
-static void opticon_shutdown(struct usb_serial *serial)
+static void opticon_disconnect(struct usb_serial *serial)
 {
         struct opticon_private *priv = usb_get_serial_data(serial);
 
@@ -471,9 +471,16 @@ static void opticon_shutdown(struct usb_serial *serial)
 
         usb_kill_urb(priv->bulk_read_urb);
         usb_free_urb(priv->bulk_read_urb);
+}
+
+static void opticon_release(struct usb_serial *serial)
+{
+        struct opticon_private *priv = usb_get_serial_data(serial);
+
+        dbg("%s", __func__);
+
         kfree(priv->bulk_in_buffer);
         kfree(priv);
-        usb_set_serial_data(serial, NULL);
 }
 
 static int opticon_suspend(struct usb_interface *intf, pm_message_t message)
@@ -524,7 +531,8 @@ static struct usb_serial_driver opticon_device = {
         .close =                opticon_close,
         .write =                opticon_write,
         .write_room =           opticon_write_room,
-        .shutdown =             opticon_shutdown,
+        .disconnect =           opticon_disconnect,
+        .release =              opticon_release,
         .throttle =             opticon_throttle,
         .unthrottle =           opticon_unthrottle,
         .ioctl =                opticon_ioctl,
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index a16d69fadba1..575816e6ba37 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -43,13 +43,16 @@
 #include <linux/usb/serial.h>
 
 /* Function prototypes */
+static int  option_probe(struct usb_serial *serial,
+                        const struct usb_device_id *id);
 static int  option_open(struct tty_struct *tty, struct usb_serial_port *port,
                                                         struct file *filp);
 static void option_close(struct usb_serial_port *port);
 static void option_dtr_rts(struct usb_serial_port *port, int on);
 
 static int  option_startup(struct usb_serial *serial);
-static void option_shutdown(struct usb_serial *serial);
+static void option_disconnect(struct usb_serial *serial);
+static void option_release(struct usb_serial *serial);
 static int  option_write_room(struct tty_struct *tty);
 
 static void option_instat_callback(struct urb *urb);
@@ -202,9 +205,9 @@ static int  option_resume(struct usb_serial *serial);
 #define NOVATELWIRELESS_PRODUCT_MC727           0x4100
 #define NOVATELWIRELESS_PRODUCT_MC950D          0x4400
 #define NOVATELWIRELESS_PRODUCT_U727            0x5010
+#define NOVATELWIRELESS_PRODUCT_MC760           0x6000
 
 /* FUTURE NOVATEL PRODUCTS */
-#define NOVATELWIRELESS_PRODUCT_EVDO_FULLSPEED  0X6000
 #define NOVATELWIRELESS_PRODUCT_EVDO_HIGHSPEED  0X6001
 #define NOVATELWIRELESS_PRODUCT_HSPA_FULLSPEED  0X7000
 #define NOVATELWIRELESS_PRODUCT_HSPA_HIGHSPEED  0X7001
@@ -305,6 +308,10 @@ static int  option_resume(struct usb_serial *serial);
 #define DLINK_PRODUCT_DWM_652                   0x3e04
 
 
+/* TOSHIBA PRODUCTS */
+#define TOSHIBA_VENDOR_ID                       0x0930
+#define TOSHIBA_PRODUCT_HSDPA_MINICARD          0x1302
+
 static struct usb_device_id option_ids[] = {
         { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
         { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA) },
@@ -422,7 +429,7 @@ static struct usb_device_id option_ids[] = {
         { USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, NOVATELWIRELESS_PRODUCT_MC950D) }, /* Novatel MC930D/MC950D */
         { USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, NOVATELWIRELESS_PRODUCT_MC727) }, /* Novatel MC727/U727/USB727 */
         { USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, NOVATELWIRELESS_PRODUCT_U727) }, /* Novatel MC727/U727/USB727 */
-        { USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, NOVATELWIRELESS_PRODUCT_EVDO_FULLSPEED) }, /* Novatel EVDO product */
+        { USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, NOVATELWIRELESS_PRODUCT_MC760) }, /* Novatel MC760/U760/USB760 */
         { USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, NOVATELWIRELESS_PRODUCT_HSPA_FULLSPEED) }, /* Novatel HSPA product */
         { USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, NOVATELWIRELESS_PRODUCT_EVDO_EMBEDDED_FULLSPEED) }, /* Novatel EVDO Embedded product */
         { USB_DEVICE(NOVATELWIRELESS_VENDOR_ID, NOVATELWIRELESS_PRODUCT_HSPA_EMBEDDED_FULLSPEED) }, /* Novatel HSPA Embedded product */
@@ -523,6 +530,7 @@ static struct usb_device_id option_ids[] = {
         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_H10) },
         { USB_DEVICE(DLINK_VENDOR_ID, DLINK_PRODUCT_DWM_652) },
         { USB_DEVICE(0x1da5, 0x4515) }, /* BenQ H20 */
+        { USB_DEVICE(TOSHIBA_VENDOR_ID, TOSHIBA_PRODUCT_HSDPA_MINICARD ) }, /* Toshiba 3G HSDPA == Novatel Expedite EU870D MiniCard */
         { } /* Terminating entry */
 };
 MODULE_DEVICE_TABLE(usb, option_ids);
@@ -550,6 +558,7 @@ static struct usb_serial_driver option_1port_device = {
         .usb_driver        = &option_driver,
         .id_table          = option_ids,
         .num_ports         = 1,
+        .probe             = option_probe,
         .open              = option_open,
         .close             = option_close,
         .dtr_rts           = option_dtr_rts,
@@ -560,7 +569,8 @@ static struct usb_serial_driver option_1port_device = {
         .tiocmget          = option_tiocmget,
         .tiocmset          = option_tiocmset,
         .attach            = option_startup,
-        .shutdown          = option_shutdown,
+        .disconnect        = option_disconnect,
+        .release           = option_release,
         .read_int_callback = option_instat_callback,
         .suspend           = option_suspend,
         .resume            = option_resume,
@@ -626,6 +636,18 @@ static void __exit option_exit(void)
 module_init(option_init);
 module_exit(option_exit);
 
+static int option_probe(struct usb_serial *serial,
+                        const struct usb_device_id *id)
+{
+        /* D-Link DWM 652 still exposes CD-Rom emulation interface in modem mode */
+        if (serial->dev->descriptor.idVendor == DLINK_VENDOR_ID &&
+                serial->dev->descriptor.idProduct == DLINK_PRODUCT_DWM_652 &&
+                serial->interface->cur_altsetting->desc.bInterfaceClass == 0x8)
+                return -ENODEV;
+
+        return 0;
+}
+
 static void option_set_termios(struct tty_struct *tty,
                 struct usb_serial_port *port, struct ktermios *old_termios)
 {
@@ -1129,7 +1151,14 @@ static void stop_read_write_urbs(struct usb_serial *serial)
         }
 }
 
-static void option_shutdown(struct usb_serial *serial)
+static void option_disconnect(struct usb_serial *serial)
+{
+        dbg("%s", __func__);
+
+        stop_read_write_urbs(serial);
+}
+
+static void option_release(struct usb_serial *serial)
 {
         int i, j;
         struct usb_serial_port *port;
@@ -1137,8 +1166,6 @@ static void option_shutdown(struct usb_serial *serial)
 
         dbg("%s", __func__);
 
-        stop_read_write_urbs(serial);
-
         /* Now free them */
         for (i = 0; i < serial->num_ports; ++i) {
                 port = serial->port[i];
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c
index 7de54781fe61..3cece27325e7 100644
--- a/drivers/usb/serial/oti6858.c
+++ b/drivers/usb/serial/oti6858.c
@@ -159,7 +159,7 @@ static int oti6858_tiocmget(struct tty_struct *tty, struct file *file);
 static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
                                 unsigned int set, unsigned int clear);
 static int oti6858_startup(struct usb_serial *serial);
-static void oti6858_shutdown(struct usb_serial *serial);
+static void oti6858_release(struct usb_serial *serial);
 
 /* functions operating on buffers */
 static struct oti6858_buf *oti6858_buf_alloc(unsigned int size);
@@ -194,7 +194,7 @@ static struct usb_serial_driver oti6858_device = {
         .write_room =           oti6858_write_room,
         .chars_in_buffer =      oti6858_chars_in_buffer,
         .attach =               oti6858_startup,
-        .shutdown =             oti6858_shutdown,
+        .release =              oti6858_release,
 };
 
 struct oti6858_private {
@@ -782,7 +782,7 @@ static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
 }
 
 
-static void oti6858_shutdown(struct usb_serial *serial)
+static void oti6858_release(struct usb_serial *serial)
 {
         struct oti6858_private *priv;
         int i;
@@ -794,7 +794,6 @@ static void oti6858_shutdown(struct usb_serial *serial)
                 if (priv) {
                         oti6858_buf_free(priv->buf);
                         kfree(priv);
-                        usb_set_serial_port_data(serial->port[i], NULL);
                 }
         }
 }
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index e02dc3d643c7..ec6c132a25b5 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -878,7 +878,7 @@ static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
                 dbg("%s - error sending break = %d", __func__, result);
 }
 
-static void pl2303_shutdown(struct usb_serial *serial)
+static void pl2303_release(struct usb_serial *serial)
 {
         int i;
         struct pl2303_private *priv;
@@ -890,7 +890,6 @@ static void pl2303_shutdown(struct usb_serial *serial)
                 if (priv) {
                         pl2303_buf_free(priv->buf);
                         kfree(priv);
-                        usb_set_serial_port_data(serial->port[i], NULL);
                 }
         }
 }
@@ -927,6 +926,8 @@ static void pl2303_update_line_status(struct usb_serial_port *port,
         spin_lock_irqsave(&priv->lock, flags);
         priv->line_status = data[status_idx];
         spin_unlock_irqrestore(&priv->lock, flags);
+        if (priv->line_status & UART_BREAK_ERROR)
+                usb_serial_handle_break(port);
         wake_up_interruptible(&priv->delta_msr_wait);
 }
 
@@ -1037,7 +1038,8 @@ static void pl2303_read_bulk_callback(struct urb *urb)
                 if (line_status & UART_OVERRUN_ERROR)
                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
                 for (i = 0; i < urb->actual_length; ++i)
-                        tty_insert_flip_char(tty, data[i], tty_flag);
+                        if (!usb_serial_handle_sysrq_char(port, data[i]))
+                                tty_insert_flip_char(tty, data[i], tty_flag);
                 tty_flip_buffer_push(tty);
         }
         tty_kref_put(tty);
@@ -1120,7 +1122,7 @@ static struct usb_serial_driver pl2303_device = {
         .write_room =           pl2303_write_room,
         .chars_in_buffer =      pl2303_chars_in_buffer,
         .attach =               pl2303_startup,
-        .shutdown =             pl2303_shutdown,
+        .release =              pl2303_release,
 };
 
 static int __init pl2303_init(void)
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 17ac34f4d668..032f7aeb40a4 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -1,7 +1,10 @@
 /*
   USB Driver for Sierra Wireless
 
-  Copyright (C) 2006, 2007, 2008  Kevin Lloyd <klloyd@sierrawireless.com>
+  Copyright (C) 2006, 2007, 2008  Kevin Lloyd <klloyd@sierrawireless.com>,
+
+  Copyright (C) 2008, 2009  Elina Pasheva, Matthew Safar, Rory Filer
+                        <linux@sierrawireless.com>
 
   IMPORTANT DISCLAIMER: This driver is not commercially supported by
   Sierra Wireless. Use at your own risk.
@@ -14,8 +17,8 @@
   Whom based his on the Keyspan driver by Hugh Blemings <hugh@blemings.org>
 */
 
-#define DRIVER_VERSION "v.1.3.3"
-#define DRIVER_AUTHOR "Kevin Lloyd <klloyd@sierrawireless.com>"
+#define DRIVER_VERSION "v.1.3.7"
+#define DRIVER_AUTHOR "Kevin Lloyd, Elina Pasheva, Matthew Safar, Rory Filer"
 #define DRIVER_DESC "USB Driver for Sierra Wireless USB modems"
 
 #include <linux/kernel.h>
@@ -30,10 +33,15 @@
 #define SWIMS_USB_REQUEST_SetPower      0x00
 #define SWIMS_USB_REQUEST_SetNmea       0x07
 
-#define N_IN_URB        4
-#define N_OUT_URB       4
+#define N_IN_URB        8
+#define N_OUT_URB       64
 #define IN_BUFLEN       4096
 
+#define MAX_TRANSFER            (PAGE_SIZE - 512)
+/* MAX_TRANSFER is chosen so that the VM is not stressed by
+   allocations > PAGE_SIZE and the number of packets in a page
+   is an integer 512 is the largest possible packet on EHCI */
+
 static int debug;
 static int nmea;
 
@@ -46,7 +54,7 @@ struct sierra_iface_info {
 static int sierra_set_power_state(struct usb_device *udev, __u16 swiState)
 {
         int result;
-        dev_dbg(&udev->dev, "%s", __func__);
+        dev_dbg(&udev->dev, "%s\n", __func__);
         result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                         SWIMS_USB_REQUEST_SetPower,     /* __u8 request      */
                         USB_TYPE_VENDOR,                /* __u8 request type */
@@ -61,7 +69,7 @@ static int sierra_set_power_state(struct usb_device *udev, __u16 swiState)
 static int sierra_vsc_set_nmea(struct usb_device *udev, __u16 enable)
 {
         int result;
-        dev_dbg(&udev->dev, "%s", __func__);
+        dev_dbg(&udev->dev, "%s\n", __func__);
         result = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                         SWIMS_USB_REQUEST_SetNmea,      /* __u8 request      */
                         USB_TYPE_VENDOR,                /* __u8 request type */
@@ -75,18 +83,22 @@ static int sierra_vsc_set_nmea(struct usb_device *udev, __u16 enable)
 
 static int sierra_calc_num_ports(struct usb_serial *serial)
 {
-        int result;
-        int *num_ports = usb_get_serial_data(serial);
-        dev_dbg(&serial->dev->dev, "%s", __func__);
+        int num_ports = 0;
+        u8 ifnum, numendpoints;
 
-        result = *num_ports;
+        dev_dbg(&serial->dev->dev, "%s\n", __func__);
 
-        if (result) {
-                kfree(num_ports);
-                usb_set_serial_data(serial, NULL);
-        }
+        ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
+        numendpoints = serial->interface->cur_altsetting->desc.bNumEndpoints;
 
-        return result;
+        /* Dummy interface present on some SKUs should be ignored */
+        if (ifnum == 0x99)
+                num_ports = 0;
+        else if (numendpoints <= 3)
+                num_ports = 1;
+        else
+                num_ports = (numendpoints-1)/2;
+        return num_ports;
 }
 
 static int is_blacklisted(const u8 ifnum,
@@ -111,7 +123,7 @@ static int sierra_calc_interface(struct usb_serial *serial)
         int interface;
         struct usb_interface *p_interface;
         struct usb_host_interface *p_host_interface;
-        dev_dbg(&serial->dev->dev, "%s", __func__);
+        dev_dbg(&serial->dev->dev, "%s\n", __func__);
 
         /* Get the interface structure pointer from the serial struct */
         p_interface = serial->interface;
@@ -132,23 +144,12 @@ static int sierra_probe(struct usb_serial *serial,
 {
         int result = 0;
         struct usb_device *udev;
-        int *num_ports;
         u8 ifnum;
-        u8 numendpoints;
 
-        dev_dbg(&serial->dev->dev, "%s", __func__);
-
-        num_ports = kmalloc(sizeof(*num_ports), GFP_KERNEL);
-        if (!num_ports)
-                return -ENOMEM;
-
-        ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
-        numendpoints = serial->interface->cur_altsetting->desc.bNumEndpoints;
         udev = serial->dev;
+        dev_dbg(&udev->dev, "%s\n", __func__);
 
-        /* Figure out the interface number from the serial structure */
         ifnum = sierra_calc_interface(serial);
-
         /*
          * If this interface supports more than 1 alternate
          * select the 2nd one
@@ -160,20 +161,6 @@ static int sierra_probe(struct usb_serial *serial,
                 usb_set_interface(udev, ifnum, 1);
         }
 
-        /* Dummy interface present on some SKUs should be ignored */
-        if (ifnum == 0x99)
-                *num_ports = 0;
-        else if (numendpoints <= 3)
-                *num_ports = 1;
-        else
-                *num_ports = (numendpoints-1)/2;
-
-        /*
-         * save off our num_ports info so that we can use it in the
-         * calc_num_ports callback
-         */
-        usb_set_serial_data(serial, (void *)num_ports);
-
         /* ifnum could have changed - by calling usb_set_interface */
         ifnum = sierra_calc_interface(serial);
 
@@ -289,7 +276,7 @@ static int sierra_send_setup(struct usb_serial_port *port)
         __u16 interface = 0;
         int val = 0;
 
-        dev_dbg(&port->dev, "%s", __func__);
+        dev_dbg(&port->dev, "%s\n", __func__);
 
         portdata = usb_get_serial_port_data(port);
 
@@ -332,7 +319,7 @@ static int sierra_send_setup(struct usb_serial_port *port)
 static void sierra_set_termios(struct tty_struct *tty,
                 struct usb_serial_port *port, struct ktermios *old_termios)
 {
-        dev_dbg(&port->dev, "%s", __func__);
+        dev_dbg(&port->dev, "%s\n", __func__);
         tty_termios_copy_hw(tty->termios, old_termios);
         sierra_send_setup(port);
 }
@@ -343,7 +330,7 @@ static int sierra_tiocmget(struct tty_struct *tty, struct file *file)
         unsigned int value;
         struct sierra_port_private *portdata;
 
-        dev_dbg(&port->dev, "%s", __func__);
+        dev_dbg(&port->dev, "%s\n", __func__);
         portdata = usb_get_serial_port_data(port);
 
         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
@@ -394,14 +381,14 @@ static void sierra_outdat_callback(struct urb *urb)
         int status = urb->status;
         unsigned long flags;
 
-        dev_dbg(&port->dev, "%s - port %d", __func__, port->number);
+        dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
 
         /* free up the transfer buffer, as usb_free_urb() does not do this */
         kfree(urb->transfer_buffer);
 
         if (status)
                 dev_dbg(&port->dev, "%s - nonzero write bulk status "
-                    "received: %d", __func__, status);
+                    "received: %d\n", __func__, status);
 
         spin_lock_irqsave(&portdata->lock, flags);
         --portdata->outstanding_urbs;
@@ -419,50 +406,61 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
         unsigned long flags;
         unsigned char *buffer;
         struct urb *urb;
-        int status;
+        size_t writesize = min((size_t)count, (size_t)MAX_TRANSFER);
+        int retval = 0;
+
+        /* verify that we actually have some data to write */
+        if (count == 0)
+                return 0;
 
         portdata = usb_get_serial_port_data(port);
 
-        dev_dbg(&port->dev, "%s: write (%d chars)", __func__, count);
+        dev_dbg(&port->dev, "%s: write (%zd bytes)\n", __func__, writesize);
 
         spin_lock_irqsave(&portdata->lock, flags);
+        dev_dbg(&port->dev, "%s - outstanding_urbs: %d\n", __func__,
+                portdata->outstanding_urbs);
         if (portdata->outstanding_urbs > N_OUT_URB) {
                 spin_unlock_irqrestore(&portdata->lock, flags);
                 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
                 return 0;
         }
         portdata->outstanding_urbs++;
+        dev_dbg(&port->dev, "%s - 1, outstanding_urbs: %d\n", __func__,
+                portdata->outstanding_urbs);
         spin_unlock_irqrestore(&portdata->lock, flags);
 
-        buffer = kmalloc(count, GFP_ATOMIC);
+        buffer = kmalloc(writesize, GFP_ATOMIC);
         if (!buffer) {
                 dev_err(&port->dev, "out of memory\n");
-                count = -ENOMEM;
+                retval = -ENOMEM;
                 goto error_no_buffer;
         }
 
         urb = usb_alloc_urb(0, GFP_ATOMIC);
         if (!urb) {
                 dev_err(&port->dev, "no more free urbs\n");
-                count = -ENOMEM;
+                retval = -ENOMEM;
                 goto error_no_urb;
         }
 
-        memcpy(buffer, buf, count);
+        memcpy(buffer, buf, writesize);
 
-        usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
+        usb_serial_debug_data(debug, &port->dev, __func__, writesize, buffer);
 
         usb_fill_bulk_urb(urb, serial->dev,
                           usb_sndbulkpipe(serial->dev,
                                           port->bulk_out_endpointAddress),
-                          buffer, count, sierra_outdat_callback, port);
+                          buffer, writesize, sierra_outdat_callback, port);
+
+        /* Handle the need to send a zero length packet */
+        urb->transfer_flags |= URB_ZERO_PACKET;
 
         /* send it down the pipe */
-        status = usb_submit_urb(urb, GFP_ATOMIC);
-        if (status) {
+        retval = usb_submit_urb(urb, GFP_ATOMIC);
+        if (retval) {
                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
-                        "with status = %d\n", __func__, status);
-                count = status;
+                        "with status = %d\n", __func__, retval);
                 goto error;
         }
 
@@ -470,7 +468,7 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
          * really free it when it is finished with it */
         usb_free_urb(urb);
 
-        return count;
+        return writesize;
 error:
         usb_free_urb(urb);
 error_no_urb:
@@ -478,8 +476,10 @@ error_no_urb:
 error_no_buffer:
         spin_lock_irqsave(&portdata->lock, flags);
         --portdata->outstanding_urbs;
+        dev_dbg(&port->dev, "%s - 2. outstanding_urbs: %d\n", __func__,
+                portdata->outstanding_urbs);
         spin_unlock_irqrestore(&portdata->lock, flags);
-        return count;
+        return retval;
 }
 
 static void sierra_indat_callback(struct urb *urb)
@@ -491,33 +491,39 @@ static void sierra_indat_callback(struct urb *urb)
         unsigned char *data = urb->transfer_buffer;
         int status = urb->status;
 
-        dbg("%s: %p", __func__, urb);
-
         endpoint = usb_pipeendpoint(urb->pipe);
-        port =  urb->context;
+        port = urb->context;
+
+        dev_dbg(&port->dev, "%s: %p\n", __func__, urb);
 
         if (status) {
                 dev_dbg(&port->dev, "%s: nonzero status: %d on"
-                    " endpoint %02x.", __func__, status, endpoint);
+                        " endpoint %02x\n", __func__, status, endpoint);
         } else {
                 if (urb->actual_length) {
                         tty = tty_port_tty_get(&port->port);
+
                         tty_buffer_request_room(tty, urb->actual_length);
                         tty_insert_flip_string(tty, data, urb->actual_length);
                         tty_flip_buffer_push(tty);
+
                         tty_kref_put(tty);
-                } else
+                        usb_serial_debug_data(debug, &port->dev, __func__,
+                                urb->actual_length, data);
+                } else {
                         dev_dbg(&port->dev, "%s: empty read urb"
-                                " received", __func__);
-
-                /* Resubmit urb so we continue receiving */
-                if (port->port.count && status != -ESHUTDOWN && status != -EPERM) {
-                        err = usb_submit_urb(urb, GFP_ATOMIC);
-                        if (err)
-                                dev_err(&port->dev, "resubmit read urb failed."
-                                        "(%d)\n", err);
+                                " received\n", __func__);
                 }
         }
+
+        /* Resubmit urb so we continue receiving */
+        if (port->port.count && status != -ESHUTDOWN && status != -EPERM) {
+                err = usb_submit_urb(urb, GFP_ATOMIC);
+                if (err)
+                        dev_err(&port->dev, "resubmit read urb failed."
+                                "(%d)\n", err);
+        }
+
         return;
 }
 
@@ -529,8 +535,7 @@ static void sierra_instat_callback(struct urb *urb)
         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
         struct usb_serial *serial = port->serial;
 
-        dev_dbg(&port->dev, "%s", __func__);
-        dev_dbg(&port->dev, "%s: urb %p port %p has data %p", __func__,
+        dev_dbg(&port->dev, "%s: urb %p port %p has data %p\n", __func__,
                 urb, port, portdata);
 
         if (status == 0) {
@@ -550,7 +555,7 @@ static void sierra_instat_callback(struct urb *urb)
                                         sizeof(struct usb_ctrlrequest));
                         struct tty_struct *tty;
 
-                        dev_dbg(&port->dev, "%s: signal x%x", __func__,
+                        dev_dbg(&port->dev, "%s: signal x%x\n", __func__,
                                 signals);
 
                         old_dcd_state = portdata->dcd_state;
@@ -565,20 +570,20 @@ static void sierra_instat_callback(struct urb *urb)
                                 tty_hangup(tty);
                         tty_kref_put(tty);
                 } else {
-                        dev_dbg(&port->dev, "%s: type %x req %x",
+                        dev_dbg(&port->dev, "%s: type %x req %x\n",
                                 __func__, req_pkt->bRequestType,
                                 req_pkt->bRequest);
                 }
         } else
-                dev_dbg(&port->dev, "%s: error %d", __func__, status);
+                dev_dbg(&port->dev, "%s: error %d\n", __func__, status);
 
         /* Resubmit urb so we continue receiving IRQ data */
-        if (status != -ESHUTDOWN) {
+        if (port->port.count && status != -ESHUTDOWN && status != -ENOENT) {
                 urb->dev = serial->dev;
                 err = usb_submit_urb(urb, GFP_ATOMIC);
                 if (err)
-                        dev_dbg(&port->dev, "%s: resubmit intr urb "
-                                "failed. (%d)", __func__, err);
+                        dev_err(&port->dev, "%s: resubmit intr urb "
+                                "failed. (%d)\n", __func__, err);
         }
 }
 
@@ -588,7 +593,7 @@ static int sierra_write_room(struct tty_struct *tty)
         struct sierra_port_private *portdata = usb_get_serial_port_data(port);
         unsigned long flags;
 
-        dev_dbg(&port->dev, "%s - port %d", __func__, port->number);
+        dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
 
         /* try to give a good number back based on if we have any free urbs at
          * this point in time */
@@ -729,7 +734,7 @@ static int sierra_open(struct tty_struct *tty,
 
         portdata = usb_get_serial_port_data(port);
 
-        dev_dbg(&port->dev, "%s", __func__);
+        dev_dbg(&port->dev, "%s\n", __func__);
 
         /* Set some sane defaults */
         portdata->rts_state = 1;
@@ -782,7 +787,7 @@ static int sierra_startup(struct usb_serial *serial)
         struct sierra_port_private *portdata;
         int i;
 
-        dev_dbg(&serial->dev->dev, "%s", __func__);
+        dev_dbg(&serial->dev->dev, "%s\n", __func__);
 
         /* Set Device mode to D0 */
         sierra_set_power_state(serial->dev, 0x0000);
@@ -797,7 +802,7 @@ static int sierra_startup(struct usb_serial *serial)
                 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
                 if (!portdata) {
                         dev_dbg(&port->dev, "%s: kmalloc for "
-                                "sierra_port_private (%d) failed!.",
+                                "sierra_port_private (%d) failed!.\n",
                                 __func__, i);
                         return -ENOMEM;
                 }
@@ -809,13 +814,13 @@ static int sierra_startup(struct usb_serial *serial)
         return 0;
 }
 
-static void sierra_shutdown(struct usb_serial *serial)
+static void sierra_disconnect(struct usb_serial *serial)
 {
         int i;
         struct usb_serial_port *port;
         struct sierra_port_private *portdata;
 
-        dev_dbg(&serial->dev->dev, "%s", __func__);
+        dev_dbg(&serial->dev->dev, "%s\n", __func__);
 
         for (i = 0; i < serial->num_ports; ++i) {
                 port = serial->port[i];
@@ -848,7 +853,7 @@ static struct usb_serial_driver sierra_device = {
         .tiocmget          = sierra_tiocmget,
         .tiocmset          = sierra_tiocmset,
         .attach            = sierra_startup,
-        .shutdown          = sierra_shutdown,
+        .disconnect        = sierra_disconnect,
         .read_int_callback = sierra_instat_callback,
 };
 
diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c
index 8f7ed8f13996..3c249d8e8b8e 100644
--- a/drivers/usb/serial/spcp8x5.c
+++ b/drivers/usb/serial/spcp8x5.c
@@ -356,7 +356,7 @@ cleanup:
 }
 
 /* call when the device plug out. free all the memory alloced by probe */
-static void spcp8x5_shutdown(struct usb_serial *serial)
+static void spcp8x5_release(struct usb_serial *serial)
 {
         int i;
         struct spcp8x5_private *priv;
@@ -366,7 +366,6 @@ static void spcp8x5_shutdown(struct usb_serial *serial)
                 if (priv) {
                         free_ringbuf(priv->buf);
                         kfree(priv);
-                        usb_set_serial_port_data(serial->port[i] , NULL);
                 }
         }
 }
@@ -1020,7 +1019,7 @@ static struct usb_serial_driver spcp8x5_device = {
         .write_bulk_callback    = spcp8x5_write_bulk_callback,
         .chars_in_buffer        = spcp8x5_chars_in_buffer,
         .attach                 = spcp8x5_startup,
-        .shutdown               = spcp8x5_shutdown,
+        .release                = spcp8x5_release,
 };
 
 static int __init spcp8x5_init(void)
diff --git a/drivers/usb/serial/symbolserial.c b/drivers/usb/serial/symbolserial.c
index 8b07ebc6baeb..6157fac9366b 100644
--- a/drivers/usb/serial/symbolserial.c
+++ b/drivers/usb/serial/symbolserial.c
@@ -267,7 +267,7 @@ error:
         return retval;
 }
 
-static void symbol_shutdown(struct usb_serial *serial)
+static void symbol_disconnect(struct usb_serial *serial)
 {
         struct symbol_private *priv = usb_get_serial_data(serial);
 
@@ -275,9 +275,16 @@ static void symbol_shutdown(struct usb_serial *serial)
 
         usb_kill_urb(priv->int_urb);
         usb_free_urb(priv->int_urb);
+}
+
+static void symbol_release(struct usb_serial *serial)
+{
+        struct symbol_private *priv = usb_get_serial_data(serial);
+
+        dbg("%s", __func__);
+
         kfree(priv->int_buffer);
         kfree(priv);
-        usb_set_serial_data(serial, NULL);
 }
 
 static struct usb_driver symbol_driver = {
@@ -299,7 +306,8 @@ static struct usb_serial_driver symbol_device = {
         .attach =               symbol_startup,
         .open =                 symbol_open,
         .close =                symbol_close,
-        .shutdown =             symbol_shutdown,
+        .disconnect =           symbol_disconnect,
+        .release =              symbol_release,
         .throttle =             symbol_throttle,
         .unthrottle =           symbol_unthrottle,
 };
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 42cb04c403be..991d8232e376 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -97,7 +97,7 @@ struct ti_device {
 /* Function Declarations */
 
 static int ti_startup(struct usb_serial *serial);
-static void ti_shutdown(struct usb_serial *serial);
+static void ti_release(struct usb_serial *serial);
 static int ti_open(struct tty_struct *tty, struct usb_serial_port *port,
                 struct file *file);
 static void ti_close(struct usb_serial_port *port);
@@ -230,7 +230,7 @@ static struct usb_serial_driver ti_1port_device = {
         .id_table               = ti_id_table_3410,
         .num_ports              = 1,
         .attach                 = ti_startup,
-        .shutdown               = ti_shutdown,
+        .release                = ti_release,
         .open                   = ti_open,
         .close                  = ti_close,
         .write                  = ti_write,
@@ -258,7 +258,7 @@ static struct usb_serial_driver ti_2port_device = {
         .id_table               = ti_id_table_5052,
         .num_ports              = 2,
         .attach                 = ti_startup,
-        .shutdown               = ti_shutdown,
+        .release                = ti_release,
         .open                   = ti_open,
         .close                  = ti_close,
         .write                  = ti_write,
@@ -473,7 +473,7 @@ free_tdev:
 }
 
 
-static void ti_shutdown(struct usb_serial *serial)
+static void ti_release(struct usb_serial *serial)
 {
         int i;
         struct ti_device *tdev = usb_get_serial_data(serial);
@@ -486,12 +486,10 @@ static void ti_shutdown(struct usb_serial *serial)
                 if (tport) {
                         ti_buf_free(tport->tp_write_buf);
                         kfree(tport);
-                        usb_set_serial_port_data(serial->port[i], NULL);
                 }
         }
 
         kfree(tdev);
-        usb_set_serial_data(serial, NULL);
 }
 
 
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 1967a7edc10c..d595aa5586a7 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -141,6 +141,14 @@ static void destroy_serial(struct kref *kref)
         if (serial->minor != SERIAL_TTY_NO_MINOR)
                 return_serial(serial);
 
+        serial->type->release(serial);
+
+        for (i = 0; i < serial->num_ports; ++i) {
+                port = serial->port[i];
+                if (port)
+                        put_device(&port->dev);
+        }
+
         /* If this is a "fake" port, we have to clean it up here, as it will
          * not get cleaned up in port_release() as it was never registered with
          * the driver core */
@@ -148,9 +156,8 @@ static void destroy_serial(struct kref *kref)
                 for (i = serial->num_ports;
                                         i < serial->num_port_pointers; ++i) {
                         port = serial->port[i];
-                        if (!port)
-                                continue;
-                        port_free(port);
+                        if (port)
+                                port_free(port);
                 }
         }
 
@@ -1046,10 +1053,15 @@ int usb_serial_probe(struct usb_interface *interface,
 
                 dev_set_name(&port->dev, "ttyUSB%d", port->number);
                 dbg ("%s - registering %s", __func__, dev_name(&port->dev));
+                port->dev_state = PORT_REGISTERING;
                 retval = device_register(&port->dev);
-                if (retval)
+                if (retval) {
                         dev_err(&port->dev, "Error registering port device, "
                                 "continuing\n");
+                        port->dev_state = PORT_UNREGISTERED;
+                } else {
+                        port->dev_state = PORT_REGISTERED;
+                }
         }
 
         usb_serial_console_init(debug, minor);
@@ -1113,10 +1125,6 @@ void usb_serial_disconnect(struct usb_interface *interface)
         serial->disconnected = 1;
         mutex_unlock(&serial->disc_mutex);
 
-        /* Unfortunately, many of the sub-drivers expect the port structures
-         * to exist when their shutdown method is called, so we have to go
-         * through this awkward two-step unregistration procedure.
-         */
         for (i = 0; i < serial->num_ports; ++i) {
                 port = serial->port[i];
                 if (port) {
@@ -1130,17 +1138,25 @@ void usb_serial_disconnect(struct usb_interface *interface)
                         }
                         kill_traffic(port);
                         cancel_work_sync(&port->work);
-                        device_del(&port->dev);
-                }
-        }
-        serial->type->shutdown(serial);
-        for (i = 0; i < serial->num_ports; ++i) {
-                port = serial->port[i];
-                if (port) {
-                        put_device(&port->dev);
-                        serial->port[i] = NULL;
+                        if (port->dev_state == PORT_REGISTERED) {
+
+                                /* Make sure the port is bound so that the
+                                 * driver's port_remove method is called.
+                                 */
+                                if (!port->dev.driver) {
+                                        int rc;
+
+                                        port->dev.driver =
+                                                        &serial->type->driver;
+                                        rc = device_bind_driver(&port->dev);
+                                }
+                                port->dev_state = PORT_UNREGISTERING;
+                                device_del(&port->dev);
+                                port->dev_state = PORT_UNREGISTERED;
+                        }
                 }
         }
+        serial->type->disconnect(serial);
 
         /* let the last holder of this object
          * cause it to be cleaned up */
@@ -1318,7 +1334,8 @@ static void fixup_generic(struct usb_serial_driver *device)
         set_to_generic_if_null(device, chars_in_buffer);
         set_to_generic_if_null(device, read_bulk_callback);
         set_to_generic_if_null(device, write_bulk_callback);
-        set_to_generic_if_null(device, shutdown);
+        set_to_generic_if_null(device, disconnect);
+        set_to_generic_if_null(device, release);
 }
 
 int usb_serial_register(struct usb_serial_driver *driver)
diff --git a/drivers/usb/serial/usb_debug.c b/drivers/usb/serial/usb_debug.c
index 6c9cbb59552a..614800972dc3 100644
--- a/drivers/usb/serial/usb_debug.c
+++ b/drivers/usb/serial/usb_debug.c
@@ -15,7 +15,19 @@
 #include <linux/usb.h>
 #include <linux/usb/serial.h>
 
+#define URB_DEBUG_MAX_IN_FLIGHT_URBS    4000
 #define USB_DEBUG_MAX_PACKET_SIZE       8
+#define USB_DEBUG_BRK_SIZE              8
+static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
+        0x00,
+        0xff,
+        0x01,
+        0xfe,
+        0x00,
+        0xfe,
+        0x01,
+        0xff,
+};
 
 static struct usb_device_id id_table [] = {
         { USB_DEVICE(0x0525, 0x127a) },
@@ -38,6 +50,32 @@ static int usb_debug_open(struct tty_struct *tty, struct usb_serial_port *port,
         return usb_serial_generic_open(tty, port, filp);
 }
 
+/* This HW really does not support a serial break, so one will be
+ * emulated when ever the break state is set to true.
+ */
+static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
+{
+        struct usb_serial_port *port = tty->driver_data;
+        if (!break_state)
+                return;
+        usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
+}
+
+static void usb_debug_read_bulk_callback(struct urb *urb)
+{
+        struct usb_serial_port *port = urb->context;
+
+        if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
+            memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
+                   USB_DEBUG_BRK_SIZE) == 0) {
+                usb_serial_handle_break(port);
+                usb_serial_generic_resubmit_read_urb(port, GFP_ATOMIC);
+                return;
+        }
+
+        usb_serial_generic_read_bulk_callback(urb);
+}
+
 static struct usb_serial_driver debug_device = {
         .driver = {
                 .owner =        THIS_MODULE,
@@ -46,6 +84,9 @@ static struct usb_serial_driver debug_device = {
         .id_table =             id_table,
         .num_ports =            1,
         .open =                 usb_debug_open,
+        .max_in_flight_urbs =   URB_DEBUG_MAX_IN_FLIGHT_URBS,
+        .break_ctl =            usb_debug_break_ctl,
+        .read_bulk_callback =   usb_debug_read_bulk_callback,
 };
 
 static int __init debug_init(void)
diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index b15f1c0e1d4a..f5d0f64dcc52 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -47,7 +47,7 @@ static void visor_unthrottle(struct tty_struct *tty);
 static int  visor_probe(struct usb_serial *serial,
                                         const struct usb_device_id *id);
 static int  visor_calc_num_ports(struct usb_serial *serial);
-static void visor_shutdown(struct usb_serial *serial);
+static void visor_release(struct usb_serial *serial);
 static void visor_write_bulk_callback(struct urb *urb);
 static void visor_read_bulk_callback(struct urb *urb);
 static void visor_read_int_callback(struct urb *urb);
@@ -202,7 +202,7 @@ static struct usb_serial_driver handspring_device = {
         .attach =               treo_attach,
         .probe =                visor_probe,
         .calc_num_ports =       visor_calc_num_ports,
-        .shutdown =             visor_shutdown,
+        .release =              visor_release,
         .write =                visor_write,
         .write_room =           visor_write_room,
         .write_bulk_callback =  visor_write_bulk_callback,
@@ -227,7 +227,7 @@ static struct usb_serial_driver clie_5_device = {
         .attach =               clie_5_attach,
         .probe =                visor_probe,
         .calc_num_ports =       visor_calc_num_ports,
-        .shutdown =             visor_shutdown,
+        .release =              visor_release,
         .write =                visor_write,
         .write_room =           visor_write_room,
         .write_bulk_callback =  visor_write_bulk_callback,
@@ -918,7 +918,7 @@ static int clie_5_attach(struct usb_serial *serial)
         return generic_startup(serial);
 }
 
-static void visor_shutdown(struct usb_serial *serial)
+static void visor_release(struct usb_serial *serial)
 {
         struct visor_private *priv;
         int i;
@@ -927,10 +927,7 @@ static void visor_shutdown(struct usb_serial *serial)
 
         for (i = 0; i < serial->num_ports; i++) {
                 priv = usb_get_serial_port_data(serial->port[i]);
-                if (priv) {
-                        usb_set_serial_port_data(serial->port[i], NULL);
-                        kfree(priv);
-                }
+                kfree(priv);
         }
 }
 
diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index 7c7295d09f34..8d126dd7a02e 100644
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -144,7 +144,7 @@ static int  whiteheat_firmware_attach(struct usb_serial *serial);
 
 /* function prototypes for the Connect Tech WhiteHEAT serial converter */
 static int  whiteheat_attach(struct usb_serial *serial);
-static void whiteheat_shutdown(struct usb_serial *serial);
+static void whiteheat_release(struct usb_serial *serial);
 static int  whiteheat_open(struct tty_struct *tty,
                         struct usb_serial_port *port, struct file *filp);
 static void whiteheat_close(struct usb_serial_port *port);
@@ -189,7 +189,7 @@ static struct usb_serial_driver whiteheat_device = {
         .id_table =             id_table_std,
         .num_ports =            4,
         .attach =               whiteheat_attach,
-        .shutdown =             whiteheat_shutdown,
+        .release =              whiteheat_release,
         .open =                 whiteheat_open,
         .close =                whiteheat_close,
         .write =                whiteheat_write,
@@ -617,7 +617,7 @@ no_command_buffer:
 }
 
 
-static void whiteheat_shutdown(struct usb_serial *serial)
+static void whiteheat_release(struct usb_serial *serial)
 {
         struct usb_serial_port *command_port;
         struct usb_serial_port *port;
diff --git a/drivers/usb/storage/initializers.c b/drivers/usb/storage/initializers.c
index 2dd9bd4bff56..ec17c96371af 100644
--- a/drivers/usb/storage/initializers.c
+++ b/drivers/usb/storage/initializers.c
@@ -52,7 +52,7 @@ int usb_stor_euscsi_init(struct us_data *us)
         us->iobuf[0] = 0x1;
         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
                         0x0C, USB_RECIP_INTERFACE | USB_TYPE_VENDOR,
-                        0x01, 0x0, us->iobuf, 0x1, 5*HZ);
+                        0x01, 0x0, us->iobuf, 0x1, 5000);
         US_DEBUGP("-- result is %d\n", result);
 
         return 0;
@@ -80,14 +80,16 @@ int usb_stor_ucr61s2b_init(struct us_data *us)
 
         res = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcb,
                         US_BULK_CB_WRAP_LEN, &partial);
-        if(res)
-                return res;
+        if (res)
+                return -EIO;
 
         US_DEBUGP("Getting status packet...\n");
         res = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
                         US_BULK_CS_WRAP_LEN, &partial);
+        if (res)
+                return -EIO;
 
-        return (res ? -1 : 0);
+        return 0;
 }
 
 /* This places the HUAWEI E220 devices in multi-port mode */
@@ -99,6 +101,6 @@ int usb_stor_huawei_e220_init(struct us_data *us)
                                       USB_REQ_SET_FEATURE,
                                       USB_TYPE_STANDARD | USB_RECIP_DEVICE,
                                       0x01, 0x0, NULL, 0x0, 1000);
-        US_DEBUGP("usb_control_msg performing result is %d\n", result);
-        return (result ? 0 : -1);
+        US_DEBUGP("Huawei mode set result is %d\n", result);
+        return (result ? 0 : -ENODEV);
 }
diff --git a/drivers/usb/storage/option_ms.c b/drivers/usb/storage/option_ms.c
index 353f922939a4..d41cc0a970f7 100644
--- a/drivers/usb/storage/option_ms.c
+++ b/drivers/usb/storage/option_ms.c
@@ -37,7 +37,7 @@ MODULE_PARM_DESC(option_zero_cd, "ZeroCD mode (1=Force Modem (default),"
 
 #define RESPONSE_LEN 1024
 
-static int option_rezero(struct us_data *us, int ep_in, int ep_out)
+static int option_rezero(struct us_data *us)
 {
         const unsigned char rezero_msg[] = {
           0x55, 0x53, 0x42, 0x43, 0x78, 0x56, 0x34, 0x12,
@@ -54,10 +54,10 @@ static int option_rezero(struct us_data *us, int ep_in, int ep_out)
         if (buffer == NULL)
                 return USB_STOR_TRANSPORT_ERROR;
 
-        memcpy(buffer, rezero_msg, sizeof (rezero_msg));
+        memcpy(buffer, rezero_msg, sizeof(rezero_msg));
         result = usb_stor_bulk_transfer_buf(us,
-                        usb_sndbulkpipe(us->pusb_dev, ep_out),
-                        buffer, sizeof (rezero_msg), NULL);
+                        us->send_bulk_pipe,
+                        buffer, sizeof(rezero_msg), NULL);
         if (result != USB_STOR_XFER_GOOD) {
                 result = USB_STOR_XFER_ERROR;
                 goto out;
@@ -66,9 +66,15 @@ static int option_rezero(struct us_data *us, int ep_in, int ep_out)
         /* Some of the devices need to be asked for a response, but we don't
          * care what that response is.
          */
-        result = usb_stor_bulk_transfer_buf(us,
-                        usb_sndbulkpipe(us->pusb_dev, ep_out),
+        usb_stor_bulk_transfer_buf(us,
+                        us->recv_bulk_pipe,
                         buffer, RESPONSE_LEN, NULL);
+
+        /* Read the CSW */
+        usb_stor_bulk_transfer_buf(us,
+                        us->recv_bulk_pipe,
+                        buffer, 13, NULL);
+
         result = USB_STOR_XFER_GOOD;
 
 out:
@@ -76,63 +82,75 @@ out:
         return result;
 }
 
-int option_ms_init(struct us_data *us)
+static int option_inquiry(struct us_data *us)
 {
-        struct usb_device *udev;
-        struct usb_interface *intf;
-        struct usb_host_interface *iface_desc;
-        struct usb_endpoint_descriptor *endpoint = NULL;
-        u8 ep_in = 0, ep_out = 0;
-        int ep_in_size = 0, ep_out_size = 0;
-        int i, result;
-
-        udev = us->pusb_dev;
-        intf = us->pusb_intf;
-
-        /* Ensure it's really a ZeroCD device; devices that are already
-         * in modem mode return 0xFF for class, subclass, and protocol.
-         */
-        if (udev->descriptor.bDeviceClass != 0 ||
-            udev->descriptor.bDeviceSubClass != 0 ||
-            udev->descriptor.bDeviceProtocol != 0)
-                return USB_STOR_TRANSPORT_GOOD;
+        const unsigned char inquiry_msg[] = {
+          0x55, 0x53, 0x42, 0x43, 0x12, 0x34, 0x56, 0x78,
+          0x24, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x12,
+          0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x00,
+          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+        };
+        char *buffer;
+        int result;
 
-        US_DEBUGP("Option MS: option_ms_init called\n");
+        US_DEBUGP("Option MS: %s", "device inquiry for vendor name\n");
 
-        /* Find the right mass storage interface */
-        iface_desc = intf->cur_altsetting;
-        if (iface_desc->desc.bInterfaceClass != 0x8 ||
-            iface_desc->desc.bInterfaceSubClass != 0x6 ||
-            iface_desc->desc.bInterfaceProtocol != 0x50) {
-                US_DEBUGP("Option MS: mass storage interface not found, no action "
-                          "required\n");
-                return USB_STOR_TRANSPORT_GOOD;
-        }
+        buffer = kzalloc(0x24, GFP_KERNEL);
+        if (buffer == NULL)
+                return USB_STOR_TRANSPORT_ERROR;
 
-        /* Find the mass storage bulk endpoints */
-        for (i = 0; i < iface_desc->desc.bNumEndpoints && (!ep_in_size || !ep_out_size); ++i) {
-                endpoint = &iface_desc->endpoint[i].desc;
-
-                if (usb_endpoint_is_bulk_in(endpoint)) {
-                        ep_in = usb_endpoint_num(endpoint);
-                        ep_in_size = le16_to_cpu(endpoint->wMaxPacketSize);
-                } else if (usb_endpoint_is_bulk_out(endpoint)) {
-                        ep_out = usb_endpoint_num(endpoint);
-                        ep_out_size = le16_to_cpu(endpoint->wMaxPacketSize);
-                }
+        memcpy(buffer, inquiry_msg, sizeof(inquiry_msg));
+        result = usb_stor_bulk_transfer_buf(us,
+                        us->send_bulk_pipe,
+                        buffer, sizeof(inquiry_msg), NULL);
+        if (result != USB_STOR_XFER_GOOD) {
+                result = USB_STOR_XFER_ERROR;
+                goto out;
         }
 
-        /* Can't find the mass storage endpoints */
-        if (!ep_in_size || !ep_out_size) {
-                US_DEBUGP("Option MS: mass storage endpoints not found, no action "
-                          "required\n");
-                return USB_STOR_TRANSPORT_GOOD;
+        result = usb_stor_bulk_transfer_buf(us,
+                        us->recv_bulk_pipe,
+                        buffer, 0x24, NULL);
+        if (result != USB_STOR_XFER_GOOD) {
+                result = USB_STOR_XFER_ERROR;
+                goto out;
         }
 
+        result = memcmp(buffer+8, "Option", 6);
+
+        /* Read the CSW */
+        usb_stor_bulk_transfer_buf(us,
+                        us->recv_bulk_pipe,
+                        buffer, 13, NULL);
+
+out:
+        kfree(buffer);
+        return result;
+}
+
+
+int option_ms_init(struct us_data *us)
+{
+        int result;
+
+        US_DEBUGP("Option MS: option_ms_init called\n");
+
+        /* Additional test for vendor information via INQUIRY,
+         * because some vendor/product IDs are ambiguous
+         */
+        result = option_inquiry(us);
+        if (result != 0) {
+                US_DEBUGP("Option MS: vendor is not Option or not determinable,"
+                          " no action taken\n");
+                return 0;
+        } else
+                US_DEBUGP("Option MS: this is a genuine Option device,"
+                          " proceeding\n");
+
         /* Force Modem mode */
         if (option_zero_cd == ZCD_FORCE_MODEM) {
                 US_DEBUGP("Option MS: %s", "Forcing Modem Mode\n");
-                result = option_rezero(us, ep_in, ep_out);
+                result = option_rezero(us);
                 if (result != USB_STOR_XFER_GOOD)
                         US_DEBUGP("Option MS: Failed to switch to modem mode.\n");
                 return -EIO;
@@ -142,6 +160,6 @@ int option_ms_init(struct us_data *us)
                           " requests it\n");
         }
 
-        return USB_STOR_TRANSPORT_GOOD;
+        return 0;
 }
 
diff --git a/drivers/usb/storage/sierra_ms.c b/drivers/usb/storage/sierra_ms.c
index 4359a2cb42df..4395c4100ec2 100644
--- a/drivers/usb/storage/sierra_ms.c
+++ b/drivers/usb/storage/sierra_ms.c
@@ -202,6 +202,6 @@ int sierra_ms_init(struct us_data *us)
 complete:
         result = device_create_file(&us->pusb_intf->dev, &dev_attr_truinst);
 
-        return USB_STOR_TRANSPORT_GOOD;
+        return 0;
 }
 
diff --git a/drivers/usb/storage/unusual_devs.h b/drivers/usb/storage/unusual_devs.h
index 4b8b69045fe6..1b9c5dd0fb27 100644
--- a/drivers/usb/storage/unusual_devs.h
+++ b/drivers/usb/storage/unusual_devs.h
@@ -1385,7 +1385,7 @@ UNUSUAL_DEV(  0x10d6, 0x2200, 0x0100, 0x0100,
 UNUSUAL_DEV(  0x1186, 0x3e04, 0x0000, 0x0000,
            "D-Link",
            "USB Mass Storage",
-           US_SC_DEVICE, US_PR_DEVICE, option_ms_init, 0),
+           US_SC_DEVICE, US_PR_DEVICE, option_ms_init, US_FL_IGNORE_DEVICE),
 
 /* Reported by Kevin Lloyd <linux@sierrawireless.com>
  * Entry is needed for the initializer function override,