Merge commit 'origin/master' into next

1 files changed, 3269 insertions, 0 deletions

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");