fusb300_udc.c

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/*
 * Fusb300 UDC (USB gadget)
 *
 * Copyright (C) 2010 Faraday Technology Corp.
 *
 * Author : Yuan-hsin Chen <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 */
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

#include "fusb300_udc.h"

MODULE_DESCRIPTION("FUSB300  USB gadget driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yuan Hsin Chen <[email protected]>");
MODULE_ALIAS("platform:fusb300_udc");

#define DRIVER_VERSION  "20 October 2010"

static const char udc_name[] = "fusb300_udc";
static const char * const fusb300_ep_name[] = {
    "ep0", "ep1", "ep2", "ep3", "ep4", "ep5", "ep6", "ep7", "ep8", "ep9",
    "ep10", "ep11", "ep12", "ep13", "ep14", "ep15"
};

static void done(struct fusb300_ep *ep, struct fusb300_request *req,
         int status);

static void fusb300_enable_bit(struct fusb300 *fusb300, u32 offset,
                   u32 value)
{
    u32 reg = ioread32(fusb300->reg + offset);

    reg |= value;
    iowrite32(reg, fusb300->reg + offset);
}

static void fusb300_disable_bit(struct fusb300 *fusb300, u32 offset,
                u32 value)
{
    u32 reg = ioread32(fusb300->reg + offset);

    reg &= ~value;
    iowrite32(reg, fusb300->reg + offset);
}


static void fusb300_ep_setting(struct fusb300_ep *ep,
                   struct fusb300_ep_info info)
{
    ep->epnum = info.epnum;
    ep->type = info.type;
}

static int fusb300_ep_release(struct fusb300_ep *ep)
{
    if (!ep->epnum)
        return 0;
    ep->epnum = 0;
    ep->stall = 0;
    ep->wedged = 0;
    return 0;
}

static void fusb300_set_fifo_entry(struct fusb300 *fusb300,
                   u32 ep)
{
    u32 val = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET1(ep));

    val &= ~FUSB300_EPSET1_FIFOENTRY_MSK;
    val |= FUSB300_EPSET1_FIFOENTRY(FUSB300_FIFO_ENTRY_NUM);
    iowrite32(val, fusb300->reg + FUSB300_OFFSET_EPSET1(ep));
}

static void fusb300_set_start_entry(struct fusb300 *fusb300,
                    u8 ep)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET1(ep));
    u32 start_entry = fusb300->fifo_entry_num * FUSB300_FIFO_ENTRY_NUM;

    reg &= ~FUSB300_EPSET1_START_ENTRY_MSK  ;
    reg |= FUSB300_EPSET1_START_ENTRY(start_entry);
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_EPSET1(ep));
    if (fusb300->fifo_entry_num == FUSB300_MAX_FIFO_ENTRY) {
        fusb300->fifo_entry_num = 0;
        fusb300->addrofs = 0;
        pr_err("fifo entry is over the maximum number!\n");
    } else
        fusb300->fifo_entry_num++;
}

/* set fusb300_set_start_entry first before fusb300_set_epaddrofs */
static void fusb300_set_epaddrofs(struct fusb300 *fusb300,
                  struct fusb300_ep_info info)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET2(info.epnum));

    reg &= ~FUSB300_EPSET2_ADDROFS_MSK;
    reg |= FUSB300_EPSET2_ADDROFS(fusb300->addrofs);
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_EPSET2(info.epnum));
    fusb300->addrofs += (info.maxpacket + 7) / 8 * FUSB300_FIFO_ENTRY_NUM;
}

static void ep_fifo_setting(struct fusb300 *fusb300,
                struct fusb300_ep_info info)
{
    fusb300_set_fifo_entry(fusb300, info.epnum);
    fusb300_set_start_entry(fusb300, info.epnum);
    fusb300_set_epaddrofs(fusb300, info);
}

static void fusb300_set_eptype(struct fusb300 *fusb300,
                   struct fusb300_ep_info info)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET1(info.epnum));

    reg &= ~FUSB300_EPSET1_TYPE_MSK;
    reg |= FUSB300_EPSET1_TYPE(info.type);
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_EPSET1(info.epnum));
}

static void fusb300_set_epdir(struct fusb300 *fusb300,
                  struct fusb300_ep_info info)
{
    u32 reg;

    if (!info.dir_in)
        return;
    reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET1(info.epnum));
    reg &= ~FUSB300_EPSET1_DIR_MSK;
    reg |= FUSB300_EPSET1_DIRIN;
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_EPSET1(info.epnum));
}

static void fusb300_set_ep_active(struct fusb300 *fusb300,
              u8 ep)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET1(ep));

    reg |= FUSB300_EPSET1_ACTEN;
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_EPSET1(ep));
}

static void fusb300_set_epmps(struct fusb300 *fusb300,
                  struct fusb300_ep_info info)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET2(info.epnum));

    reg &= ~FUSB300_EPSET2_MPS_MSK;
    reg |= FUSB300_EPSET2_MPS(info.maxpacket);
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_EPSET2(info.epnum));
}

static void fusb300_set_interval(struct fusb300 *fusb300,
                 struct fusb300_ep_info info)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET1(info.epnum));

    reg &= ~FUSB300_EPSET1_INTERVAL(0x7);
    reg |= FUSB300_EPSET1_INTERVAL(info.interval);
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_EPSET1(info.epnum));
}

static void fusb300_set_bwnum(struct fusb300 *fusb300,
                  struct fusb300_ep_info info)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET1(info.epnum));

    reg &= ~FUSB300_EPSET1_BWNUM(0x3);
    reg |= FUSB300_EPSET1_BWNUM(info.bw_num);
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_EPSET1(info.epnum));
}

static void set_ep_reg(struct fusb300 *fusb300,
              struct fusb300_ep_info info)
{
    fusb300_set_eptype(fusb300, info);
    fusb300_set_epdir(fusb300, info);
    fusb300_set_epmps(fusb300, info);

    if (info.interval)
        fusb300_set_interval(fusb300, info);

    if (info.bw_num)
        fusb300_set_bwnum(fusb300, info);

    fusb300_set_ep_active(fusb300, info.epnum);
}

static int config_ep(struct fusb300_ep *ep,
             const struct usb_endpoint_descriptor *desc)
{
    struct fusb300 *fusb300 = ep->fusb300;
    struct fusb300_ep_info info;

    ep->ep.desc = desc;

    info.interval = 0;
    info.addrofs = 0;
    info.bw_num = 0;

    info.type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
    info.dir_in = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? 1 : 0;
    info.maxpacket = usb_endpoint_maxp(desc);
    info.epnum = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;

    if ((info.type == USB_ENDPOINT_XFER_INT) ||
       (info.type == USB_ENDPOINT_XFER_ISOC)) {
        info.interval = desc->bInterval;
        if (info.type == USB_ENDPOINT_XFER_ISOC)
            info.bw_num = ((desc->wMaxPacketSize & 0x1800) >> 11);
    }

    ep_fifo_setting(fusb300, info);

    set_ep_reg(fusb300, info);

    fusb300_ep_setting(ep, info);

    fusb300->ep[info.epnum] = ep;

    return 0;
}

static int fusb300_enable(struct usb_ep *_ep,
              const struct usb_endpoint_descriptor *desc)
{
    struct fusb300_ep *ep;

    ep = container_of(_ep, struct fusb300_ep, ep);

    if (ep->fusb300->reenum) {
        ep->fusb300->fifo_entry_num = 0;
        ep->fusb300->addrofs = 0;
        ep->fusb300->reenum = 0;
    }

    return config_ep(ep, desc);
}

static int fusb300_disable(struct usb_ep *_ep)
{
    struct fusb300_ep *ep;
    struct fusb300_request *req;
    unsigned long flags;

    ep = container_of(_ep, struct fusb300_ep, ep);

    BUG_ON(!ep);

    while (!list_empty(&ep->queue)) {
        req = list_entry(ep->queue.next, struct fusb300_request, queue);
        spin_lock_irqsave(&ep->fusb300->lock, flags);
        done(ep, req, -ECONNRESET);
        spin_unlock_irqrestore(&ep->fusb300->lock, flags);
    }

    return fusb300_ep_release(ep);
}

static struct usb_request *fusb300_alloc_request(struct usb_ep *_ep,
                        gfp_t gfp_flags)
{
    struct fusb300_request *req;

    req = kzalloc(sizeof(struct fusb300_request), gfp_flags);
    if (!req)
        return NULL;
    INIT_LIST_HEAD(&req->queue);

    return &req->req;
}

static void fusb300_free_request(struct usb_ep *_ep, struct usb_request *_req)
{
    struct fusb300_request *req;

    req = container_of(_req, struct fusb300_request, req);
    kfree(req);
}

static int enable_fifo_int(struct fusb300_ep *ep)
{
    struct fusb300 *fusb300 = ep->fusb300;

    if (ep->epnum) {
        fusb300_enable_bit(fusb300, FUSB300_OFFSET_IGER0,
            FUSB300_IGER0_EEPn_FIFO_INT(ep->epnum));
    } else {
        pr_err("can't enable_fifo_int ep0\n");
        return -EINVAL;
    }

    return 0;
}

static int disable_fifo_int(struct fusb300_ep *ep)
{
    struct fusb300 *fusb300 = ep->fusb300;

    if (ep->epnum) {
        fusb300_disable_bit(fusb300, FUSB300_OFFSET_IGER0,
            FUSB300_IGER0_EEPn_FIFO_INT(ep->epnum));
    } else {
        pr_err("can't disable_fifo_int ep0\n");
        return -EINVAL;
    }

    return 0;
}

static void fusb300_set_cxlen(struct fusb300 *fusb300, u32 length)
{
    u32 reg;

    reg = ioread32(fusb300->reg + FUSB300_OFFSET_CSR);
    reg &= ~FUSB300_CSR_LEN_MSK;
    reg |= FUSB300_CSR_LEN(length);
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_CSR);
}

/* write data to cx fifo */
static void fusb300_wrcxf(struct fusb300_ep *ep,
           struct fusb300_request *req)
{
    int i = 0;
    u8 *tmp;
    u32 data;
    struct fusb300 *fusb300 = ep->fusb300;
    u32 length = req->req.length - req->req.actual;

    tmp = req->req.buf + req->req.actual;

    if (length > SS_CTL_MAX_PACKET_SIZE) {
        fusb300_set_cxlen(fusb300, SS_CTL_MAX_PACKET_SIZE);
        for (i = (SS_CTL_MAX_PACKET_SIZE >> 2); i > 0; i--) {
            data = *tmp | *(tmp + 1) << 8 | *(tmp + 2) << 16 |
                *(tmp + 3) << 24;
            iowrite32(data, fusb300->reg + FUSB300_OFFSET_CXPORT);
            tmp += 4;
        }
        req->req.actual += SS_CTL_MAX_PACKET_SIZE;
    } else { /* length is less than max packet size */
        fusb300_set_cxlen(fusb300, length);
        for (i = length >> 2; i > 0; i--) {
            data = *tmp | *(tmp + 1) << 8 | *(tmp + 2) << 16 |
                *(tmp + 3) << 24;
            printk(KERN_DEBUG "    0x%x\n", data);
            iowrite32(data, fusb300->reg + FUSB300_OFFSET_CXPORT);
            tmp = tmp + 4;
        }
        switch (length % 4) {
        case 1:
            data = *tmp;
            printk(KERN_DEBUG "    0x%x\n", data);
            iowrite32(data, fusb300->reg + FUSB300_OFFSET_CXPORT);
            break;
        case 2:
            data = *tmp | *(tmp + 1) << 8;
            printk(KERN_DEBUG "    0x%x\n", data);
            iowrite32(data, fusb300->reg + FUSB300_OFFSET_CXPORT);
            break;
        case 3:
            data = *tmp | *(tmp + 1) << 8 | *(tmp + 2) << 16;
            printk(KERN_DEBUG "    0x%x\n", data);
            iowrite32(data, fusb300->reg + FUSB300_OFFSET_CXPORT);
            break;
        default:
            break;
        }
        req->req.actual += length;
    }
}

static void fusb300_set_epnstall(struct fusb300 *fusb300, u8 ep)
{
    fusb300_enable_bit(fusb300, FUSB300_OFFSET_EPSET0(ep),
        FUSB300_EPSET0_STL);
}

static void fusb300_clear_epnstall(struct fusb300 *fusb300, u8 ep)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET0(ep));

    if (reg & FUSB300_EPSET0_STL) {
        printk(KERN_DEBUG "EP%d stall... Clear!!\n", ep);
        reg &= ~FUSB300_EPSET0_STL;
        iowrite32(reg, fusb300->reg + FUSB300_OFFSET_EPSET0(ep));
    }
}

static void ep0_queue(struct fusb300_ep *ep, struct fusb300_request *req)
{
    if (ep->fusb300->ep0_dir) { /* if IN */
        if (req->req.length) {
            fusb300_wrcxf(ep, req);
        } else
            printk(KERN_DEBUG "%s : req->req.length = 0x%x\n",
                __func__, req->req.length);
        if ((req->req.length == req->req.actual) ||
            (req->req.actual < ep->ep.maxpacket))
            done(ep, req, 0);
    } else { /* OUT */
        if (!req->req.length)
            done(ep, req, 0);
        else
            fusb300_enable_bit(ep->fusb300, FUSB300_OFFSET_IGER1,
                FUSB300_IGER1_CX_OUT_INT);
    }
}

static int fusb300_queue(struct usb_ep *_ep, struct usb_request *_req,
             gfp_t gfp_flags)
{
    struct fusb300_ep *ep;
    struct fusb300_request *req;
    unsigned long flags;
    int request  = 0;

    ep = container_of(_ep, struct fusb300_ep, ep);
    req = container_of(_req, struct fusb300_request, req);

    if (ep->fusb300->gadget.speed == USB_SPEED_UNKNOWN)
        return -ESHUTDOWN;

    spin_lock_irqsave(&ep->fusb300->lock, flags);

    if (list_empty(&ep->queue))
        request = 1;

    list_add_tail(&req->queue, &ep->queue);

    req->req.actual = 0;
    req->req.status = -EINPROGRESS;

    if (ep->ep.desc == NULL) /* ep0 */
        ep0_queue(ep, req);
    else if (request && !ep->stall)
        enable_fifo_int(ep);

    spin_unlock_irqrestore(&ep->fusb300->lock, flags);

    return 0;
}

static int fusb300_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
    struct fusb300_ep *ep;
    struct fusb300_request *req;
    unsigned long flags;

    ep = container_of(_ep, struct fusb300_ep, ep);
    req = container_of(_req, struct fusb300_request, req);

    spin_lock_irqsave(&ep->fusb300->lock, flags);
    if (!list_empty(&ep->queue))
        done(ep, req, -ECONNRESET);
    spin_unlock_irqrestore(&ep->fusb300->lock, flags);

    return 0;
}

static int fusb300_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedge)
{
    struct fusb300_ep *ep;
    struct fusb300 *fusb300;
    unsigned long flags;
    int ret = 0;

    ep = container_of(_ep, struct fusb300_ep, ep);

    fusb300 = ep->fusb300;

    spin_lock_irqsave(&ep->fusb300->lock, flags);

    if (!list_empty(&ep->queue)) {
        ret = -EAGAIN;
        goto out;
    }

    if (value) {
        fusb300_set_epnstall(fusb300, ep->epnum);
        ep->stall = 1;
        if (wedge)
            ep->wedged = 1;
    } else {
        fusb300_clear_epnstall(fusb300, ep->epnum);
        ep->stall = 0;
        ep->wedged = 0;
    }

out:
    spin_unlock_irqrestore(&ep->fusb300->lock, flags);
    return ret;
}

static int fusb300_set_halt(struct usb_ep *_ep, int value)
{
    return fusb300_set_halt_and_wedge(_ep, value, 0);
}

static int fusb300_set_wedge(struct usb_ep *_ep)
{
    return fusb300_set_halt_and_wedge(_ep, 1, 1);
}

static void fusb300_fifo_flush(struct usb_ep *_ep)
{
}

static struct usb_ep_ops fusb300_ep_ops = {
    .enable     = fusb300_enable,
    .disable    = fusb300_disable,

    .alloc_request  = fusb300_alloc_request,
    .free_request   = fusb300_free_request,

    .queue      = fusb300_queue,
    .dequeue    = fusb300_dequeue,

    .set_halt   = fusb300_set_halt,
    .fifo_flush = fusb300_fifo_flush,
    .set_wedge  = fusb300_set_wedge,
};

/*****************************************************************************/
static void fusb300_clear_int(struct fusb300 *fusb300, u32 offset,
               u32 value)
{
    iowrite32(value, fusb300->reg + offset);
}

static void fusb300_reset(void)
{
}

static void fusb300_set_cxstall(struct fusb300 *fusb300)
{
    fusb300_enable_bit(fusb300, FUSB300_OFFSET_CSR,
               FUSB300_CSR_STL);
}

static void fusb300_set_cxdone(struct fusb300 *fusb300)
{
    fusb300_enable_bit(fusb300, FUSB300_OFFSET_CSR,
               FUSB300_CSR_DONE);
}

/* read data from cx fifo */
void fusb300_rdcxf(struct fusb300 *fusb300,
           u8 *buffer, u32 length)
{
    int i = 0;
    u8 *tmp;
    u32 data;

    tmp = buffer;

    for (i = (length >> 2); i > 0; i--) {
        data = ioread32(fusb300->reg + FUSB300_OFFSET_CXPORT);
        printk(KERN_DEBUG "    0x%x\n", data);
        *tmp = data & 0xFF;
        *(tmp + 1) = (data >> 8) & 0xFF;
        *(tmp + 2) = (data >> 16) & 0xFF;
        *(tmp + 3) = (data >> 24) & 0xFF;
        tmp = tmp + 4;
    }

    switch (length % 4) {
    case 1:
        data = ioread32(fusb300->reg + FUSB300_OFFSET_CXPORT);
        printk(KERN_DEBUG "    0x%x\n", data);
        *tmp = data & 0xFF;
        break;
    case 2:
        data = ioread32(fusb300->reg + FUSB300_OFFSET_CXPORT);
        printk(KERN_DEBUG "    0x%x\n", data);
        *tmp = data & 0xFF;
        *(tmp + 1) = (data >> 8) & 0xFF;
        break;
    case 3:
        data = ioread32(fusb300->reg + FUSB300_OFFSET_CXPORT);
        printk(KERN_DEBUG "    0x%x\n", data);
        *tmp = data & 0xFF;
        *(tmp + 1) = (data >> 8) & 0xFF;
        *(tmp + 2) = (data >> 16) & 0xFF;
        break;
    default:
        break;
    }
}

static void fusb300_rdfifo(struct fusb300_ep *ep,
              struct fusb300_request *req,
              u32 length)
{
    int i = 0;
    u8 *tmp;
    u32 data, reg;
    struct fusb300 *fusb300 = ep->fusb300;

    tmp = req->req.buf + req->req.actual;
    req->req.actual += length;

    if (req->req.actual > req->req.length)
        printk(KERN_DEBUG "req->req.actual > req->req.length\n");

    for (i = (length >> 2); i > 0; i--) {
        data = ioread32(fusb300->reg +
            FUSB300_OFFSET_EPPORT(ep->epnum));
        *tmp = data & 0xFF;
        *(tmp + 1) = (data >> 8) & 0xFF;
        *(tmp + 2) = (data >> 16) & 0xFF;
        *(tmp + 3) = (data >> 24) & 0xFF;
        tmp = tmp + 4;
    }

    switch (length % 4) {
    case 1:
        data = ioread32(fusb300->reg +
            FUSB300_OFFSET_EPPORT(ep->epnum));
        *tmp = data & 0xFF;
        break;
    case 2:
        data = ioread32(fusb300->reg +
            FUSB300_OFFSET_EPPORT(ep->epnum));
        *tmp = data & 0xFF;
        *(tmp + 1) = (data >> 8) & 0xFF;
        break;
    case 3:
        data = ioread32(fusb300->reg +
            FUSB300_OFFSET_EPPORT(ep->epnum));
        *tmp = data & 0xFF;
        *(tmp + 1) = (data >> 8) & 0xFF;
        *(tmp + 2) = (data >> 16) & 0xFF;
        break;
    default:
        break;
    }

    do {
        reg = ioread32(fusb300->reg + FUSB300_OFFSET_IGR1);
        reg &= FUSB300_IGR1_SYNF0_EMPTY_INT;
        if (i)
            printk(KERN_INFO "sync fifo is not empty!\n");
        i++;
    } while (!reg);
}

static u8 fusb300_get_epnstall(struct fusb300 *fusb300, u8 ep)
{
    u8 value;
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPSET0(ep));

    value = reg & FUSB300_EPSET0_STL;

    return value;
}

static u8 fusb300_get_cxstall(struct fusb300 *fusb300)
{
    u8 value;
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_CSR);

    value = (reg & FUSB300_CSR_STL) >> 1;

    return value;
}

static void request_error(struct fusb300 *fusb300)
{
    fusb300_set_cxstall(fusb300);
    printk(KERN_DEBUG "request error!!\n");
}

static void get_status(struct fusb300 *fusb300, struct usb_ctrlrequest *ctrl)
__releases(fusb300->lock)
__acquires(fusb300->lock)
{
    u8 ep;
    u16 status = 0;
    u16 w_index = ctrl->wIndex;

    switch (ctrl->bRequestType & USB_RECIP_MASK) {
    case USB_RECIP_DEVICE:
        status = 1 << USB_DEVICE_SELF_POWERED;
        break;
    case USB_RECIP_INTERFACE:
        status = 0;
        break;
    case USB_RECIP_ENDPOINT:
        ep = w_index & USB_ENDPOINT_NUMBER_MASK;
        if (ep) {
            if (fusb300_get_epnstall(fusb300, ep))
                status = 1 << USB_ENDPOINT_HALT;
        } else {
            if (fusb300_get_cxstall(fusb300))
                status = 0;
        }
        break;

    default:
        request_error(fusb300);
        return;     /* exit */
    }

    fusb300->ep0_data = cpu_to_le16(status);
    fusb300->ep0_req->buf = &fusb300->ep0_data;
    fusb300->ep0_req->length = 2;

    spin_unlock(&fusb300->lock);
    fusb300_queue(fusb300->gadget.ep0, fusb300->ep0_req, GFP_KERNEL);
    spin_lock(&fusb300->lock);
}

static void set_feature(struct fusb300 *fusb300, struct usb_ctrlrequest *ctrl)
{
    u8 ep;

    switch (ctrl->bRequestType & USB_RECIP_MASK) {
    case USB_RECIP_DEVICE:
        fusb300_set_cxdone(fusb300);
        break;
    case USB_RECIP_INTERFACE:
        fusb300_set_cxdone(fusb300);
        break;
    case USB_RECIP_ENDPOINT: {
        u16 w_index = le16_to_cpu(ctrl->wIndex);

        ep = w_index & USB_ENDPOINT_NUMBER_MASK;
        if (ep)
            fusb300_set_epnstall(fusb300, ep);
        else
            fusb300_set_cxstall(fusb300);
        fusb300_set_cxdone(fusb300);
        }
        break;
    default:
        request_error(fusb300);
        break;
    }
}

static void fusb300_clear_seqnum(struct fusb300 *fusb300, u8 ep)
{
    fusb300_enable_bit(fusb300, FUSB300_OFFSET_EPSET0(ep),
                FUSB300_EPSET0_CLRSEQNUM);
}

static void clear_feature(struct fusb300 *fusb300, struct usb_ctrlrequest *ctrl)
{
    struct fusb300_ep *ep =
        fusb300->ep[ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK];

    switch (ctrl->bRequestType & USB_RECIP_MASK) {
    case USB_RECIP_DEVICE:
        fusb300_set_cxdone(fusb300);
        break;
    case USB_RECIP_INTERFACE:
        fusb300_set_cxdone(fusb300);
        break;
    case USB_RECIP_ENDPOINT:
        if (ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK) {
            if (ep->wedged) {
                fusb300_set_cxdone(fusb300);
                break;
            }
            if (ep->stall) {
                ep->stall = 0;
                fusb300_clear_seqnum(fusb300, ep->epnum);
                fusb300_clear_epnstall(fusb300, ep->epnum);
                if (!list_empty(&ep->queue))
                    enable_fifo_int(ep);
            }
        }
        fusb300_set_cxdone(fusb300);
        break;
    default:
        request_error(fusb300);
        break;
    }
}

static void fusb300_set_dev_addr(struct fusb300 *fusb300, u16 addr)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_DAR);

    reg &= ~FUSB300_DAR_DRVADDR_MSK;
    reg |= FUSB300_DAR_DRVADDR(addr);

    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_DAR);
}

static void set_address(struct fusb300 *fusb300, struct usb_ctrlrequest *ctrl)
{
    if (ctrl->wValue >= 0x0100)
        request_error(fusb300);
    else {
        fusb300_set_dev_addr(fusb300, ctrl->wValue);
        fusb300_set_cxdone(fusb300);
    }
}

#define UVC_COPY_DESCRIPTORS(mem, src) \
    do { \
        const struct usb_descriptor_header * const *__src; \
        for (__src = src; *__src; ++__src) { \
            memcpy(mem, *__src, (*__src)->bLength); \
            mem += (*__src)->bLength; \
        } \
    } while (0)

static int setup_packet(struct fusb300 *fusb300, struct usb_ctrlrequest *ctrl)
{
    u8 *p = (u8 *)ctrl;
    u8 ret = 0;
    u8 i = 0;

    fusb300_rdcxf(fusb300, p, 8);
    fusb300->ep0_dir = ctrl->bRequestType & USB_DIR_IN;
    fusb300->ep0_length = ctrl->wLength;

    /* check request */
    if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
        switch (ctrl->bRequest) {
        case USB_REQ_GET_STATUS:
            get_status(fusb300, ctrl);
            break;
        case USB_REQ_CLEAR_FEATURE:
            clear_feature(fusb300, ctrl);
            break;
        case USB_REQ_SET_FEATURE:
            set_feature(fusb300, ctrl);
            break;
        case USB_REQ_SET_ADDRESS:
            set_address(fusb300, ctrl);
            break;
        case USB_REQ_SET_CONFIGURATION:
            fusb300_enable_bit(fusb300, FUSB300_OFFSET_DAR,
                       FUSB300_DAR_SETCONFG);
            /* clear sequence number */
            for (i = 1; i <= FUSB300_MAX_NUM_EP; i++)
                fusb300_clear_seqnum(fusb300, i);
            fusb300->reenum = 1;
            ret = 1;
            break;
        default:
            ret = 1;
            break;
        }
    } else
        ret = 1;

    return ret;
}

static void done(struct fusb300_ep *ep, struct fusb300_request *req,
         int status)
{
    list_del_init(&req->queue);

    /* don't modify queue heads during completion callback */
    if (ep->fusb300->gadget.speed == USB_SPEED_UNKNOWN)
        req->req.status = -ESHUTDOWN;
    else
        req->req.status = status;

    spin_unlock(&ep->fusb300->lock);
    req->req.complete(&ep->ep, &req->req);
    spin_lock(&ep->fusb300->lock);

    if (ep->epnum) {
        disable_fifo_int(ep);
        if (!list_empty(&ep->queue))
            enable_fifo_int(ep);
    } else
        fusb300_set_cxdone(ep->fusb300);
}

static void fusb300_fill_idma_prdtbl(struct fusb300_ep *ep, dma_addr_t d,
        u32 len)
{
    u32 value;
    u32 reg;

    /* wait SW owner */
    do {
        reg = ioread32(ep->fusb300->reg +
            FUSB300_OFFSET_EPPRD_W0(ep->epnum));
        reg &= FUSB300_EPPRD0_H;
    } while (reg);

    iowrite32(d, ep->fusb300->reg + FUSB300_OFFSET_EPPRD_W1(ep->epnum));

    value = FUSB300_EPPRD0_BTC(len) | FUSB300_EPPRD0_H |
        FUSB300_EPPRD0_F | FUSB300_EPPRD0_L | FUSB300_EPPRD0_I;
    iowrite32(value, ep->fusb300->reg + FUSB300_OFFSET_EPPRD_W0(ep->epnum));

    iowrite32(0x0, ep->fusb300->reg + FUSB300_OFFSET_EPPRD_W2(ep->epnum));

    fusb300_enable_bit(ep->fusb300, FUSB300_OFFSET_EPPRDRDY,
        FUSB300_EPPRDR_EP_PRD_RDY(ep->epnum));
}

static void fusb300_wait_idma_finished(struct fusb300_ep *ep)
{
    u32 reg;

    do {
        reg = ioread32(ep->fusb300->reg + FUSB300_OFFSET_IGR1);
        if ((reg & FUSB300_IGR1_VBUS_CHG_INT) ||
            (reg & FUSB300_IGR1_WARM_RST_INT) ||
            (reg & FUSB300_IGR1_HOT_RST_INT) ||
            (reg & FUSB300_IGR1_USBRST_INT)
        )
            goto IDMA_RESET;
        reg = ioread32(ep->fusb300->reg + FUSB300_OFFSET_IGR0);
        reg &= FUSB300_IGR0_EPn_PRD_INT(ep->epnum);
    } while (!reg);

    fusb300_clear_int(ep->fusb300, FUSB300_OFFSET_IGR0,
        FUSB300_IGR0_EPn_PRD_INT(ep->epnum));
IDMA_RESET:
    fusb300_clear_int(ep->fusb300, FUSB300_OFFSET_IGER0,
        FUSB300_IGER0_EEPn_PRD_INT(ep->epnum));
}

static void  fusb300_set_idma(struct fusb300_ep *ep,
            struct fusb300_request *req)
{
    dma_addr_t d;

    d = dma_map_single(NULL, req->req.buf, req->req.length, DMA_TO_DEVICE);

    if (dma_mapping_error(NULL, d)) {
        printk(KERN_DEBUG "dma_mapping_error\n");
        return;
    }

    dma_sync_single_for_device(NULL, d, req->req.length, DMA_TO_DEVICE);

    fusb300_enable_bit(ep->fusb300, FUSB300_OFFSET_IGER0,
        FUSB300_IGER0_EEPn_PRD_INT(ep->epnum));

    fusb300_fill_idma_prdtbl(ep, d, req->req.length);
    /* check idma is done */
    fusb300_wait_idma_finished(ep);

    dma_unmap_single(NULL, d, req->req.length, DMA_TO_DEVICE);
}

static void in_ep_fifo_handler(struct fusb300_ep *ep)
{
    struct fusb300_request *req = list_entry(ep->queue.next,
                    struct fusb300_request, queue);

    if (req->req.length)
        fusb300_set_idma(ep, req);
    done(ep, req, 0);
}

static void out_ep_fifo_handler(struct fusb300_ep *ep)
{
    struct fusb300 *fusb300 = ep->fusb300;
    struct fusb300_request *req = list_entry(ep->queue.next,
                         struct fusb300_request, queue);
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_EPFFR(ep->epnum));
    u32 length = reg & FUSB300_FFR_BYCNT;

    fusb300_rdfifo(ep, req, length);

    /* finish out transfer */
    if ((req->req.length == req->req.actual) || (length < ep->ep.maxpacket))
        done(ep, req, 0);
}

static void check_device_mode(struct fusb300 *fusb300)
{
    u32 reg = ioread32(fusb300->reg + FUSB300_OFFSET_GCR);

    switch (reg & FUSB300_GCR_DEVEN_MSK) {
    case FUSB300_GCR_DEVEN_SS:
        fusb300->gadget.speed = USB_SPEED_SUPER;
        break;
    case FUSB300_GCR_DEVEN_HS:
        fusb300->gadget.speed = USB_SPEED_HIGH;
        break;
    case FUSB300_GCR_DEVEN_FS:
        fusb300->gadget.speed = USB_SPEED_FULL;
        break;
    default:
        fusb300->gadget.speed = USB_SPEED_UNKNOWN;
        break;
    }
    printk(KERN_INFO "dev_mode = %d\n", (reg & FUSB300_GCR_DEVEN_MSK));
}


static void fusb300_ep0out(struct fusb300 *fusb300)
{
    struct fusb300_ep *ep = fusb300->ep[0];
    u32 reg;

    if (!list_empty(&ep->queue)) {
        struct fusb300_request *req;

        req = list_first_entry(&ep->queue,
            struct fusb300_request, queue);
        if (req->req.length)
            fusb300_rdcxf(ep->fusb300, req->req.buf,
                req->req.length);
        done(ep, req, 0);
        reg = ioread32(fusb300->reg + FUSB300_OFFSET_IGER1);
        reg &= ~FUSB300_IGER1_CX_OUT_INT;
        iowrite32(reg, fusb300->reg + FUSB300_OFFSET_IGER1);
    } else
        pr_err("%s : empty queue\n", __func__);
}

static void fusb300_ep0in(struct fusb300 *fusb300)
{
    struct fusb300_request *req;
    struct fusb300_ep *ep = fusb300->ep[0];

    if ((!list_empty(&ep->queue)) && (fusb300->ep0_dir)) {
        req = list_entry(ep->queue.next,
                struct fusb300_request, queue);
        if (req->req.length)
            fusb300_wrcxf(ep, req);
        if ((req->req.length - req->req.actual) < ep->ep.maxpacket)
            done(ep, req, 0);
    } else
        fusb300_set_cxdone(fusb300);
}

static void fusb300_grp2_handler(void)
{
}

static void fusb300_grp3_handler(void)
{
}

static void fusb300_grp4_handler(void)
{
}

static void fusb300_grp5_handler(void)
{
}

static irqreturn_t fusb300_irq(int irq, void *_fusb300)
{
    struct fusb300 *fusb300 = _fusb300;
    u32 int_grp1 = ioread32(fusb300->reg + FUSB300_OFFSET_IGR1);
    u32 int_grp1_en = ioread32(fusb300->reg + FUSB300_OFFSET_IGER1);
    u32 int_grp0 = ioread32(fusb300->reg + FUSB300_OFFSET_IGR0);
    u32 int_grp0_en = ioread32(fusb300->reg + FUSB300_OFFSET_IGER0);
    struct usb_ctrlrequest ctrl;
    u8 in;
    u32 reg;
    int i;

    spin_lock(&fusb300->lock);

    int_grp1 &= int_grp1_en;
    int_grp0 &= int_grp0_en;

    if (int_grp1 & FUSB300_IGR1_WARM_RST_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_WARM_RST_INT);
        printk(KERN_INFO"fusb300_warmreset\n");
        fusb300_reset();
    }

    if (int_grp1 & FUSB300_IGR1_HOT_RST_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_HOT_RST_INT);
        printk(KERN_INFO"fusb300_hotreset\n");
        fusb300_reset();
    }

    if (int_grp1 & FUSB300_IGR1_USBRST_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_USBRST_INT);
        fusb300_reset();
    }
    /* COMABT_INT has a highest priority */

    if (int_grp1 & FUSB300_IGR1_CX_COMABT_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_CX_COMABT_INT);
        printk(KERN_INFO"fusb300_ep0abt\n");
    }

    if (int_grp1 & FUSB300_IGR1_VBUS_CHG_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_VBUS_CHG_INT);
        printk(KERN_INFO"fusb300_vbus_change\n");
    }

    if (int_grp1 & FUSB300_IGR1_U3_EXIT_FAIL_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U3_EXIT_FAIL_INT);
    }

    if (int_grp1 & FUSB300_IGR1_U2_EXIT_FAIL_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U2_EXIT_FAIL_INT);
    }

    if (int_grp1 & FUSB300_IGR1_U1_EXIT_FAIL_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U1_EXIT_FAIL_INT);
    }

    if (int_grp1 & FUSB300_IGR1_U2_ENTRY_FAIL_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U2_ENTRY_FAIL_INT);
    }

    if (int_grp1 & FUSB300_IGR1_U1_ENTRY_FAIL_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U1_ENTRY_FAIL_INT);
    }

    if (int_grp1 & FUSB300_IGR1_U3_EXIT_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U3_EXIT_INT);
        printk(KERN_INFO "FUSB300_IGR1_U3_EXIT_INT\n");
    }

    if (int_grp1 & FUSB300_IGR1_U2_EXIT_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U2_EXIT_INT);
        printk(KERN_INFO "FUSB300_IGR1_U2_EXIT_INT\n");
    }

    if (int_grp1 & FUSB300_IGR1_U1_EXIT_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U1_EXIT_INT);
        printk(KERN_INFO "FUSB300_IGR1_U1_EXIT_INT\n");
    }

    if (int_grp1 & FUSB300_IGR1_U3_ENTRY_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U3_ENTRY_INT);
        printk(KERN_INFO "FUSB300_IGR1_U3_ENTRY_INT\n");
        fusb300_enable_bit(fusb300, FUSB300_OFFSET_SSCR1,
                   FUSB300_SSCR1_GO_U3_DONE);
    }

    if (int_grp1 & FUSB300_IGR1_U2_ENTRY_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U2_ENTRY_INT);
        printk(KERN_INFO "FUSB300_IGR1_U2_ENTRY_INT\n");
    }

    if (int_grp1 & FUSB300_IGR1_U1_ENTRY_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_U1_ENTRY_INT);
        printk(KERN_INFO "FUSB300_IGR1_U1_ENTRY_INT\n");
    }

    if (int_grp1 & FUSB300_IGR1_RESM_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_RESM_INT);
        printk(KERN_INFO "fusb300_resume\n");
    }

    if (int_grp1 & FUSB300_IGR1_SUSP_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_SUSP_INT);
        printk(KERN_INFO "fusb300_suspend\n");
    }

    if (int_grp1 & FUSB300_IGR1_HS_LPM_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_HS_LPM_INT);
        printk(KERN_INFO "fusb300_HS_LPM_INT\n");
    }

    if (int_grp1 & FUSB300_IGR1_DEV_MODE_CHG_INT) {
        fusb300_clear_int(fusb300, FUSB300_OFFSET_IGR1,
                  FUSB300_IGR1_DEV_MODE_CHG_INT);
        check_device_mode(fusb300);
    }

    if (int_grp1 & FUSB300_IGR1_CX_COMFAIL_INT) {
        fusb300_set_cxstall(fusb300);
        printk(KERN_INFO "fusb300_ep0fail\n");
    }

    if (int_grp1 & FUSB300_IGR1_CX_SETUP_INT) {
        printk(KERN_INFO "fusb300_ep0setup\n");
        if (setup_packet(fusb300, &ctrl)) {
            spin_unlock(&fusb300->lock);
            if (fusb300->driver->setup(&fusb300->gadget, &ctrl) < 0)
                fusb300_set_cxstall(fusb300);
            spin_lock(&fusb300->lock);
        }
    }

    if (int_grp1 & FUSB300_IGR1_CX_CMDEND_INT)
        printk(KERN_INFO "fusb300_cmdend\n");


    if (int_grp1 & FUSB300_IGR1_CX_OUT_INT) {
        printk(KERN_INFO "fusb300_cxout\n");
        fusb300_ep0out(fusb300);
    }

    if (int_grp1 & FUSB300_IGR1_CX_IN_INT) {
        printk(KERN_INFO "fusb300_cxin\n");
        fusb300_ep0in(fusb300);
    }

    if (int_grp1 & FUSB300_IGR1_INTGRP5)
        fusb300_grp5_handler();

    if (int_grp1 & FUSB300_IGR1_INTGRP4)
        fusb300_grp4_handler();

    if (int_grp1 & FUSB300_IGR1_INTGRP3)
        fusb300_grp3_handler();

    if (int_grp1 & FUSB300_IGR1_INTGRP2)
        fusb300_grp2_handler();

    if (int_grp0) {
        for (i = 1; i < FUSB300_MAX_NUM_EP; i++) {
            if (int_grp0 & FUSB300_IGR0_EPn_FIFO_INT(i)) {
                reg = ioread32(fusb300->reg +
                    FUSB300_OFFSET_EPSET1(i));
                in = (reg & FUSB300_EPSET1_DIRIN) ? 1 : 0;
                if (in)
                    in_ep_fifo_handler(fusb300->ep[i]);
                else
                    out_ep_fifo_handler(fusb300->ep[i]);
            }
        }
    }

    spin_unlock(&fusb300->lock);

    return IRQ_HANDLED;
}

static void fusb300_set_u2_timeout(struct fusb300 *fusb300,
                   u32 time)
{
    u32 reg;

    reg = ioread32(fusb300->reg + FUSB300_OFFSET_TT);
    reg &= ~0xff;
    reg |= FUSB300_SSCR2_U2TIMEOUT(time);

    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_TT);
}

static void fusb300_set_u1_timeout(struct fusb300 *fusb300,
                   u32 time)
{
    u32 reg;

    reg = ioread32(fusb300->reg + FUSB300_OFFSET_TT);
    reg &= ~(0xff << 8);
    reg |= FUSB300_SSCR2_U1TIMEOUT(time);

    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_TT);
}

static void init_controller(struct fusb300 *fusb300)
{
    u32 reg;
    u32 mask = 0;
    u32 val = 0;

    /* split on */
    mask = val = FUSB300_AHBBCR_S0_SPLIT_ON | FUSB300_AHBBCR_S1_SPLIT_ON;
    reg = ioread32(fusb300->reg + FUSB300_OFFSET_AHBCR);
    reg &= ~mask;
    reg |= val;
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_AHBCR);

    /* enable high-speed LPM */
    mask = val = FUSB300_HSCR_HS_LPM_PERMIT;
    reg = ioread32(fusb300->reg + FUSB300_OFFSET_HSCR);
    reg &= ~mask;
    reg |= val;
    iowrite32(reg, fusb300->reg + FUSB300_OFFSET_HSCR);

    /*set u1 u2 timmer*/
    fusb300_set_u2_timeout(fusb300, 0xff);
    fusb300_set_u1_timeout(fusb300, 0xff);

    /* enable all grp1 interrupt */
    iowrite32(0xcfffff9f, fusb300->reg + FUSB300_OFFSET_IGER1);
}
/*------------------------------------------------------------------------*/
static struct fusb300 *the_controller;

static int fusb300_udc_start(struct usb_gadget_driver *driver,
        int (*bind)(struct usb_gadget *, struct usb_gadget_driver *))
{
    struct fusb300 *fusb300 = the_controller;
    int retval;

    if (!driver
            || driver->max_speed < USB_SPEED_FULL
            || !bind
            || !driver->setup)
        return -EINVAL;

    if (!fusb300)
        return -ENODEV;

    if (fusb300->driver)
        return -EBUSY;

    /* hook up the driver */
    driver->driver.bus = NULL;
    fusb300->driver = driver;
    fusb300->gadget.dev.driver = &driver->driver;

    retval = device_add(&fusb300->gadget.dev);
    if (retval) {
        pr_err("device_add error (%d)\n", retval);
        goto error;
    }

    retval = bind(&fusb300->gadget, driver);
    if (retval) {
        pr_err("bind to driver error (%d)\n", retval);
        device_del(&fusb300->gadget.dev);
        goto error;
    }

    return 0;

error:
    fusb300->driver = NULL;
    fusb300->gadget.dev.driver = NULL;

    return retval;
}

static int fusb300_udc_stop(struct usb_gadget_driver *driver)
{
    struct fusb300 *fusb300 = the_controller;

    if (driver != fusb300->driver || !driver->unbind)
        return -EINVAL;

    driver->unbind(&fusb300->gadget);
    fusb300->gadget.dev.driver = NULL;

    init_controller(fusb300);
    device_del(&fusb300->gadget.dev);
    fusb300->driver = NULL;

    return 0;
}
/*--------------------------------------------------------------------------*/

static int fusb300_udc_pullup(struct usb_gadget *_gadget, int is_active)
{
    return 0;
}

static struct usb_gadget_ops fusb300_gadget_ops = {
    .pullup     = fusb300_udc_pullup,
    .start      = fusb300_udc_start,
    .stop       = fusb300_udc_stop,
};

static int __exit fusb300_remove(struct platform_device *pdev)
{
    struct fusb300 *fusb300 = dev_get_drvdata(&pdev->dev);

    usb_del_gadget_udc(&fusb300->gadget);
    iounmap(fusb300->reg);
    free_irq(platform_get_irq(pdev, 0), fusb300);

    fusb300_free_request(&fusb300->ep[0]->ep, fusb300->ep0_req);
    kfree(fusb300);

    return 0;
}

static int __init fusb300_probe(struct platform_device *pdev)
{
    struct resource *res, *ires, *ires1;
    void __iomem *reg = NULL;
    struct fusb300 *fusb300 = NULL;
    struct fusb300_ep *_ep[FUSB300_MAX_NUM_EP];
    int ret = 0;
    int i;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        ret = -ENODEV;
        pr_err("platform_get_resource error.\n");
        goto clean_up;
    }

    ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (!ires) {
        ret = -ENODEV;
        dev_err(&pdev->dev,
            "platform_get_resource IORESOURCE_IRQ error.\n");
        goto clean_up;
    }

    ires1 = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
    if (!ires1) {
        ret = -ENODEV;
        dev_err(&pdev->dev,
            "platform_get_resource IORESOURCE_IRQ 1 error.\n");
        goto clean_up;
    }

    reg = ioremap(res->start, resource_size(res));
    if (reg == NULL) {
        ret = -ENOMEM;
        pr_err("ioremap error.\n");
        goto clean_up;
    }

    /* initialize udc */
    fusb300 = kzalloc(sizeof(struct fusb300), GFP_KERNEL);
    if (fusb300 == NULL) {
        pr_err("kzalloc error\n");
        goto clean_up;
    }

    for (i = 0; i < FUSB300_MAX_NUM_EP; i++) {
        _ep[i] = kzalloc(sizeof(struct fusb300_ep), GFP_KERNEL);
        if (_ep[i] == NULL) {
            pr_err("_ep kzalloc error\n");
            goto clean_up;
        }
        fusb300->ep[i] = _ep[i];
    }

    spin_lock_init(&fusb300->lock);

    dev_set_drvdata(&pdev->dev, fusb300);

    fusb300->gadget.ops = &fusb300_gadget_ops;

    device_initialize(&fusb300->gadget.dev);

    dev_set_name(&fusb300->gadget.dev, "gadget");

    fusb300->gadget.max_speed = USB_SPEED_HIGH;
    fusb300->gadget.dev.parent = &pdev->dev;
    fusb300->gadget.dev.dma_mask = pdev->dev.dma_mask;
    fusb300->gadget.dev.release = pdev->dev.release;
    fusb300->gadget.name = udc_name;
    fusb300->reg = reg;

    ret = request_irq(ires->start, fusb300_irq, IRQF_SHARED,
              udc_name, fusb300);
    if (ret < 0) {
        pr_err("request_irq error (%d)\n", ret);
        goto clean_up;
    }

    ret = request_irq(ires1->start, fusb300_irq,
            IRQF_SHARED, udc_name, fusb300);
    if (ret < 0) {
        pr_err("request_irq1 error (%d)\n", ret);
        goto clean_up;
    }

    INIT_LIST_HEAD(&fusb300->gadget.ep_list);

    for (i = 0; i < FUSB300_MAX_NUM_EP ; i++) {
        struct fusb300_ep *ep = fusb300->ep[i];

        if (i != 0) {
            INIT_LIST_HEAD(&fusb300->ep[i]->ep.ep_list);
            list_add_tail(&fusb300->ep[i]->ep.ep_list,
                     &fusb300->gadget.ep_list);
        }
        ep->fusb300 = fusb300;
        INIT_LIST_HEAD(&ep->queue);
        ep->ep.name = fusb300_ep_name[i];
        ep->ep.ops = &fusb300_ep_ops;
        ep->ep.maxpacket = HS_BULK_MAX_PACKET_SIZE;
    }
    fusb300->ep[0]->ep.maxpacket = HS_CTL_MAX_PACKET_SIZE;
    fusb300->ep[0]->epnum = 0;
    fusb300->gadget.ep0 = &fusb300->ep[0]->ep;
    INIT_LIST_HEAD(&fusb300->gadget.ep0->ep_list);

    the_controller = fusb300;

    fusb300->ep0_req = fusb300_alloc_request(&fusb300->ep[0]->ep,
                GFP_KERNEL);
    if (fusb300->ep0_req == NULL)
        goto clean_up3;

    init_controller(fusb300);
    ret = usb_add_gadget_udc(&pdev->dev, &fusb300->gadget);
    if (ret)
        goto err_add_udc;

    dev_info(&pdev->dev, "version %s\n", DRIVER_VERSION);

    return 0;
err_add_udc:
    fusb300_free_request(&fusb300->ep[0]->ep, fusb300->ep0_req);

clean_up3:
    free_irq(ires->start, fusb300);

clean_up:
    if (fusb300) {
        if (fusb300->ep0_req)
            fusb300_free_request(&fusb300->ep[0]->ep,
                fusb300->ep0_req);
        kfree(fusb300);
    }
    if (reg)
        iounmap(reg);

    return ret;
}

static struct platform_driver fusb300_driver = {
    .remove =   __exit_p(fusb300_remove),
    .driver     = {
        .name = (char *) udc_name,
        .owner  = THIS_MODULE,
    },
};

static int __init fusb300_udc_init(void)
{
    return platform_driver_probe(&fusb300_driver, fusb300_probe);
}

module_init(fusb300_udc_init);

static void __exit fusb300_udc_cleanup(void)
{
    platform_driver_unregister(&fusb300_driver);
}
module_exit(fusb300_udc_cleanup);