6 files changed, 390 insertions, 5 deletions

diff --git a/drivers/usb/host/xhci-dbg.c b/drivers/usb/host/xhci-dbg.c
index 6dbf7d856f80..570cd4820458 100644
--- a/drivers/usb/host/xhci-dbg.c
+++ b/drivers/usb/host/xhci-dbg.c
@@ -152,6 +152,31 @@ void xhci_print_op_regs(struct xhci_hcd *xhci)
         xhci_print_status(xhci);
 }
 
+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, "0x%x port %s reg = 0x%x\n",
+                                        (unsigned int) addr,
+                                        names[j],
+                                        (unsigned int) xhci_readl(xhci, addr));
+                        addr++;
+                }
+        }
+}
+
 void xhci_print_ir_set(struct xhci_hcd *xhci, struct intr_reg *ir_set, int set_num)
 {
         void *addr;
@@ -228,6 +253,7 @@ 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)
diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c
index a99c119e9fd9..d7c2fed55978 100644
--- a/drivers/usb/host/xhci-hcd.c
+++ b/drivers/usb/host/xhci-hcd.c
@@ -349,6 +349,9 @@ int xhci_run(struct usb_hcd *hcd)
         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 */
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-pci.c b/drivers/usb/host/xhci-pci.c
index 89614af80d20..005c5b264a7c 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -113,7 +113,9 @@ static const struct hc_driver xhci_pci_hc_driver = {
          */
         .get_frame_number =     xhci_get_frame,
 
-        /* Implement root hub support later. */
+        /* Root hub support */
+        .hub_control =          xhci_hub_control,
+        .hub_status_data =      xhci_hub_status_data,
 };
 
 /*-------------------------------------------------------------------------*/
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index c7e3c7142b9d..9d6bb3d730c4 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -284,9 +284,38 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
         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);
+        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 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 handle_event(struct xhci_hcd *xhci)
 {
         union xhci_trb *event;
+        int update_ptrs = 1;
 
         if (!xhci->event_ring || !xhci->event_ring->dequeue) {
                 xhci->error_bitmask |= 1 << 1;
@@ -301,18 +330,24 @@ void handle_event(struct xhci_hcd *xhci)
                 return;
         }
 
-        /* FIXME: Only handles command completion events. */
+        /* 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;
         default:
                 xhci->error_bitmask |= 1 << 3;
         }
 
-        /* Update SW and HC event ring dequeue pointer */
-        inc_deq(xhci, xhci->event_ring, true);
-        set_hc_event_deq(xhci);
+        if (update_ptrs) {
+                /* Update SW and HC event ring dequeue pointer */
+                inc_deq(xhci, xhci->event_ring, true);
+                set_hc_event_deq(xhci);
+        }
         /* Are there more items on the event ring? */
         handle_event(xhci);
 }
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 66be134b8921..059c659d3f39 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -35,6 +35,8 @@
 
 /* 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.
@@ -710,6 +712,10 @@ struct xhci_event_cmd {
 } __attribute__ ((packed));
 
 
+/* 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)
@@ -1024,4 +1030,9 @@ void *setup_one_noop(struct xhci_hcd *xhci);
 void handle_event(struct xhci_hcd *xhci);
 void set_hc_event_deq(struct xhci_hcd *xhci);
 
+/* 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 */