USB: Gadget: Add Samsung S3C24XX USB High-Speed controller driver

The Samsung's S3C2416, S3C2443 and S3C2450 includes a USB High-Speed
device controller module. This driver enables support for USB high-speed
gadget functionality for the Samsung S3C24xx SoC's that include this
controller.

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Alexander Neumann <alexander@bumpern.de>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 1375 insertions, 0 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 4c02b9f1597..58456d1aec2 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -356,6 +356,23 @@ config USB_S3C2410_DEBUG
         boolean "S3C2410 udc debug messages"
         depends on USB_GADGET_S3C2410
 
+config USB_GADGET_S3C_HSUDC
+        boolean "S3C2416, S3C2443 and S3C2450 USB Device Controller"
+        depends on ARCH_S3C2410
+        select USB_GADGET_DUALSPEED
+        help
+          Samsung's S3C2416, S3C2443 and S3C2450 is an ARM9 based SoC
+          integrated with dual speed USB 2.0 device controller. It has
+          8 endpoints, as well as endpoint zero.
+
+          This driver has been tested on S3C2416 and S3C2450 processors.
+
+config USB_S3C_HSUDC
+        tristate
+        depends on USB_GADGET_S3C_HSUDC
+        default USB_GADGET
+        select USB_GADGET_SELECTED
+
 config USB_GADGET_PXA_U2O
         boolean "PXA9xx Processor USB2.0 controller"
         select USB_GADGET_DUALSPEED
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 1ea15ee74fd..4fe92b18a05 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_USB_R8A66597)	+= r8a66597-udc.o
 obj-$(CONFIG_USB_FSL_QE)        += fsl_qe_udc.o
 obj-$(CONFIG_USB_CI13XXX_PCI)   += ci13xxx_pci.o
 obj-$(CONFIG_USB_S3C_HSOTG)     += s3c-hsotg.o
+obj-$(CONFIG_USB_S3C_HSUDC)     += s3c-hsudc.o
 obj-$(CONFIG_USB_LANGWELL)      += langwell_udc.o
 obj-$(CONFIG_USB_EG20T)         += pch_udc.o
 obj-$(CONFIG_USB_PXA_U2O)       += mv_udc.o
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index ec3fd979c71..bcdac7c73e8 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -136,6 +136,12 @@
 #define gadget_is_s3c_hsotg(g)    0
 #endif
 
+#ifdef CONFIG_USB_S3C_HSUDC
+#define gadget_is_s3c_hsudc(g) (!strcmp("s3c-hsudc", (g)->name))
+#else
+#define gadget_is_s3c_hsudc(g) 0
+#endif
+
 #ifdef CONFIG_USB_GADGET_EG20T
 #define gadget_is_pch(g)        (!strcmp("pch_udc", (g)->name))
 #else
@@ -215,6 +221,8 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
                 return 0x28;
         else if (gadget_is_renesas_usbhs(gadget))
                 return 0x29;
+        else if (gadget_is_s3c_hsudc(gadget))
+                return 0x30;
 
         return -ENOENT;
 }
diff --git a/drivers/usb/gadget/s3c-hsudc.c b/drivers/usb/gadget/s3c-hsudc.c
new file mode 100644
index 00000000000..d26901932a5
--- /dev/null
+++ b/drivers/usb/gadget/s3c-hsudc.c
@@ -0,0 +1,1349 @@
+/* linux/drivers/usb/gadget/s3c-hsudc.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com/
+ *
+ * S3C24XX USB 2.0 High-speed USB controller gadget driver
+ *
+ * The S3C24XX USB 2.0 high-speed USB controller supports upto 9 endpoints.
+ * Each endpoint can be configured as either in or out endpoint. Endpoints
+ * can be configured for Bulk or Interrupt transfer mode.
+ *
+ * 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/delay.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+#include <mach/regs-s3c2443-clock.h>
+#include <plat/udc.h>
+
+#define S3C_HSUDC_REG(x)        (x)
+
+/* Non-Indexed Registers */
+#define S3C_IR                          S3C_HSUDC_REG(0x00) /* Index Register */
+#define S3C_EIR                         S3C_HSUDC_REG(0x04) /* EP Intr Status */
+#define S3C_EIR_EP0                     (1<<0)
+#define S3C_EIER                        S3C_HSUDC_REG(0x08) /* EP Intr Enable */
+#define S3C_FAR                         S3C_HSUDC_REG(0x0c) /* Gadget Address */
+#define S3C_FNR                         S3C_HSUDC_REG(0x10) /* Frame Number */
+#define S3C_EDR                         S3C_HSUDC_REG(0x14) /* EP Direction */
+#define S3C_TR                          S3C_HSUDC_REG(0x18) /* Test Register */
+#define S3C_SSR                         S3C_HSUDC_REG(0x1c) /* System Status */
+#define S3C_SSR_DTZIEN_EN               (0xff8f)
+#define S3C_SSR_ERR                     (0xff80)
+#define S3C_SSR_VBUSON                  (1 << 8)
+#define S3C_SSR_HSP                     (1 << 4)
+#define S3C_SSR_SDE                     (1 << 3)
+#define S3C_SSR_RESUME                  (1 << 2)
+#define S3C_SSR_SUSPEND                 (1 << 1)
+#define S3C_SSR_RESET                   (1 << 0)
+#define S3C_SCR                         S3C_HSUDC_REG(0x20) /* System Control */
+#define S3C_SCR_DTZIEN_EN               (1 << 14)
+#define S3C_SCR_RRD_EN                  (1 << 5)
+#define S3C_SCR_SUS_EN                  (1 << 1)
+#define S3C_SCR_RST_EN                  (1 << 0)
+#define S3C_EP0SR                       S3C_HSUDC_REG(0x24) /* EP0 Status */
+#define S3C_EP0SR_EP0_LWO               (1 << 6)
+#define S3C_EP0SR_STALL                 (1 << 4)
+#define S3C_EP0SR_TX_SUCCESS            (1 << 1)
+#define S3C_EP0SR_RX_SUCCESS            (1 << 0)
+#define S3C_EP0CR                       S3C_HSUDC_REG(0x28) /* EP0 Control */
+#define S3C_BR(_x)                      S3C_HSUDC_REG(0x60 + (_x * 4))
+
+/* Indexed Registers */
+#define S3C_ESR                         S3C_HSUDC_REG(0x2c) /* EPn Status */
+#define S3C_ESR_FLUSH                   (1 << 6)
+#define S3C_ESR_STALL                   (1 << 5)
+#define S3C_ESR_LWO                     (1 << 4)
+#define S3C_ESR_PSIF_ONE                (1 << 2)
+#define S3C_ESR_PSIF_TWO                (2 << 2)
+#define S3C_ESR_TX_SUCCESS              (1 << 1)
+#define S3C_ESR_RX_SUCCESS              (1 << 0)
+#define S3C_ECR                         S3C_HSUDC_REG(0x30) /* EPn Control */
+#define S3C_ECR_DUEN                    (1 << 7)
+#define S3C_ECR_FLUSH                   (1 << 6)
+#define S3C_ECR_STALL                   (1 << 1)
+#define S3C_ECR_IEMS                    (1 << 0)
+#define S3C_BRCR                        S3C_HSUDC_REG(0x34) /* Read Count */
+#define S3C_BWCR                        S3C_HSUDC_REG(0x38) /* Write Count */
+#define S3C_MPR                         S3C_HSUDC_REG(0x3c) /* Max Pkt Size */
+
+#define WAIT_FOR_SETUP                  (0)
+#define DATA_STATE_XMIT                 (1)
+#define DATA_STATE_RECV                 (2)
+
+/**
+ * struct s3c_hsudc_ep - Endpoint representation used by driver.
+ * @ep: USB gadget layer representation of device endpoint.
+ * @name: Endpoint name (as required by ep autoconfiguration).
+ * @dev: Reference to the device controller to which this EP belongs.
+ * @desc: Endpoint descriptor obtained from the gadget driver.
+ * @queue: Transfer request queue for the endpoint.
+ * @stopped: Maintains state of endpoint, set if EP is halted.
+ * @bEndpointAddress: EP address (including direction bit).
+ * @fifo: Base address of EP FIFO.
+ */
+struct s3c_hsudc_ep {
+        struct usb_ep ep;
+        char name[20];
+        struct s3c_hsudc *dev;
+        const struct usb_endpoint_descriptor *desc;
+        struct list_head queue;
+        u8 stopped;
+        u8 wedge;
+        u8 bEndpointAddress;
+        void __iomem *fifo;
+};
+
+/**
+ * struct s3c_hsudc_req - Driver encapsulation of USB gadget transfer request.
+ * @req: Reference to USB gadget transfer request.
+ * @queue: Used for inserting this request to the endpoint request queue.
+ */
+struct s3c_hsudc_req {
+        struct usb_request req;
+        struct list_head queue;
+};
+
+/**
+ * struct s3c_hsudc - Driver's abstraction of the device controller.
+ * @gadget: Instance of usb_gadget which is referenced by gadget driver.
+ * @driver: Reference to currenty active gadget driver.
+ * @dev: The device reference used by probe function.
+ * @lock: Lock to synchronize the usage of Endpoints (EP's are indexed).
+ * @regs: Remapped base address of controller's register space.
+ * @mem_rsrc: Device memory resource used for remapping device register space.
+ * irq: IRQ number used by the controller.
+ * uclk: Reference to the controller clock.
+ * ep0state: Current state of EP0.
+ * ep: List of endpoints supported by the controller.
+ */
+struct s3c_hsudc {
+        struct usb_gadget gadget;
+        struct usb_gadget_driver *driver;
+        struct device *dev;
+        struct s3c24xx_hsudc_platdata *pd;
+        spinlock_t lock;
+        void __iomem *regs;
+        struct resource *mem_rsrc;
+        int irq;
+        struct clk *uclk;
+        int ep0state;
+        struct s3c_hsudc_ep ep[];
+};
+
+#define ep_maxpacket(_ep)       ((_ep)->ep.maxpacket)
+#define ep_is_in(_ep)           ((_ep)->bEndpointAddress & USB_DIR_IN)
+#define ep_index(_ep)           ((_ep)->bEndpointAddress & \
+                                        USB_ENDPOINT_NUMBER_MASK)
+
+static struct s3c_hsudc *the_controller;
+static const char driver_name[] = "s3c-udc";
+static const char ep0name[] = "ep0-control";
+
+static inline struct s3c_hsudc_req *our_req(struct usb_request *req)
+{
+        return container_of(req, struct s3c_hsudc_req, req);
+}
+
+static inline struct s3c_hsudc_ep *our_ep(struct usb_ep *ep)
+{
+        return container_of(ep, struct s3c_hsudc_ep, ep);
+}
+
+static inline struct s3c_hsudc *to_hsudc(struct usb_gadget *gadget)
+{
+        return container_of(gadget, struct s3c_hsudc, gadget);
+}
+
+static inline void set_index(struct s3c_hsudc *hsudc, int ep_addr)
+{
+        ep_addr &= USB_ENDPOINT_NUMBER_MASK;
+        writel(ep_addr, hsudc->regs + S3C_IR);
+}
+
+static inline void __orr32(void __iomem *ptr, u32 val)
+{
+        writel(readl(ptr) | val, ptr);
+}
+
+static void s3c_hsudc_init_phy(void)
+{
+        u32 cfg;
+
+        cfg = readl(S3C2443_PWRCFG) | S3C2443_PWRCFG_USBPHY;
+        writel(cfg, S3C2443_PWRCFG);
+
+        cfg = readl(S3C2443_URSTCON);
+        cfg |= (S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
+        writel(cfg, S3C2443_URSTCON);
+        mdelay(1);
+
+        cfg = readl(S3C2443_URSTCON);
+        cfg &= ~(S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST);
+        writel(cfg, S3C2443_URSTCON);
+
+        cfg = readl(S3C2443_PHYCTRL);
+        cfg &= ~(S3C2443_PHYCTRL_CLKSEL | S3C2443_PHYCTRL_DSPORT);
+        cfg |= (S3C2443_PHYCTRL_EXTCLK | S3C2443_PHYCTRL_PLLSEL);
+        writel(cfg, S3C2443_PHYCTRL);
+
+        cfg = readl(S3C2443_PHYPWR);
+        cfg &= ~(S3C2443_PHYPWR_FSUSPEND | S3C2443_PHYPWR_PLL_PWRDN |
+                S3C2443_PHYPWR_XO_ON | S3C2443_PHYPWR_PLL_REFCLK |
+                S3C2443_PHYPWR_ANALOG_PD);
+        cfg |= S3C2443_PHYPWR_COMMON_ON;
+        writel(cfg, S3C2443_PHYPWR);
+
+        cfg = readl(S3C2443_UCLKCON);
+        cfg |= (S3C2443_UCLKCON_DETECT_VBUS | S3C2443_UCLKCON_FUNC_CLKEN |
+                S3C2443_UCLKCON_TCLKEN);
+        writel(cfg, S3C2443_UCLKCON);
+}
+
+static void s3c_hsudc_uninit_phy(void)
+{
+        u32 cfg;
+
+        cfg = readl(S3C2443_PWRCFG) & ~S3C2443_PWRCFG_USBPHY;
+        writel(cfg, S3C2443_PWRCFG);
+
+        writel(S3C2443_PHYPWR_FSUSPEND, S3C2443_PHYPWR);
+
+        cfg = readl(S3C2443_UCLKCON) & ~S3C2443_UCLKCON_FUNC_CLKEN;
+        writel(cfg, S3C2443_UCLKCON);
+}
+
+/**
+ * s3c_hsudc_complete_request - Complete a transfer request.
+ * @hsep: Endpoint to which the request belongs.
+ * @hsreq: Transfer request to be completed.
+ * @status: Transfer completion status for the transfer request.
+ */
+static void s3c_hsudc_complete_request(struct s3c_hsudc_ep *hsep,
+                                struct s3c_hsudc_req *hsreq, int status)
+{
+        unsigned int stopped = hsep->stopped;
+        struct s3c_hsudc *hsudc = hsep->dev;
+
+        list_del_init(&hsreq->queue);
+        hsreq->req.status = status;
+
+        if (!ep_index(hsep)) {
+                hsudc->ep0state = WAIT_FOR_SETUP;
+                hsep->bEndpointAddress &= ~USB_DIR_IN;
+        }
+
+        hsep->stopped = 1;
+        spin_unlock(&hsudc->lock);
+        if (hsreq->req.complete != NULL)
+                hsreq->req.complete(&hsep->ep, &hsreq->req);
+        spin_lock(&hsudc->lock);
+        hsep->stopped = stopped;
+}
+
+/**
+ * s3c_hsudc_nuke_ep - Terminate all requests queued for a endpoint.
+ * @hsep: Endpoint for which queued requests have to be terminated.
+ * @status: Transfer completion status for the transfer request.
+ */
+static void s3c_hsudc_nuke_ep(struct s3c_hsudc_ep *hsep, int status)
+{
+        struct s3c_hsudc_req *hsreq;
+
+        while (!list_empty(&hsep->queue)) {
+                hsreq = list_entry(hsep->queue.next,
+                                struct s3c_hsudc_req, queue);
+                s3c_hsudc_complete_request(hsep, hsreq, status);
+        }
+}
+
+/**
+ * s3c_hsudc_stop_activity - Stop activity on all endpoints.
+ * @hsudc: Device controller for which EP activity is to be stopped.
+ * @driver: Reference to the gadget driver which is currently active.
+ *
+ * All the endpoints are stopped and any pending transfer requests if any on
+ * the endpoint are terminated.
+ */
+static void s3c_hsudc_stop_activity(struct s3c_hsudc *hsudc,
+                          struct usb_gadget_driver *driver)
+{
+        struct s3c_hsudc_ep *hsep;
+        int epnum;
+
+        hsudc->gadget.speed = USB_SPEED_UNKNOWN;
+
+        for (epnum = 0; epnum < hsudc->pd->epnum; epnum++) {
+                hsep = &hsudc->ep[epnum];
+                hsep->stopped = 1;
+                s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN);
+        }
+
+        spin_unlock(&hsudc->lock);
+        driver->disconnect(&hsudc->gadget);
+        spin_lock(&hsudc->lock);
+}
+
+/**
+ * s3c_hsudc_read_setup_pkt - Read the received setup packet from EP0 fifo.
+ * @hsudc: Device controller from which setup packet is to be read.
+ * @buf: The buffer into which the setup packet is read.
+ *
+ * The setup packet received in the EP0 fifo is read and stored into a
+ * given buffer address.
+ */
+
+static void s3c_hsudc_read_setup_pkt(struct s3c_hsudc *hsudc, u16 *buf)
+{
+        int count;
+
+        count = readl(hsudc->regs + S3C_BRCR);
+        while (count--)
+                *buf++ = (u16)readl(hsudc->regs + S3C_BR(0));
+
+        writel(S3C_EP0SR_RX_SUCCESS, hsudc->regs + S3C_EP0SR);
+}
+
+/**
+ * s3c_hsudc_write_fifo - Write next chunk of transfer data to EP fifo.
+ * @hsep: Endpoint to which the data is to be written.
+ * @hsreq: Transfer request from which the next chunk of data is written.
+ *
+ * Write the next chunk of data from a transfer request to the endpoint FIFO.
+ * If the transfer request completes, 1 is returned, otherwise 0 is returned.
+ */
+static int s3c_hsudc_write_fifo(struct s3c_hsudc_ep *hsep,
+                                struct s3c_hsudc_req *hsreq)
+{
+        u16 *buf;
+        u32 max = ep_maxpacket(hsep);
+        u32 count, length;
+        bool is_last;
+        void __iomem *fifo = hsep->fifo;
+
+        buf = hsreq->req.buf + hsreq->req.actual;
+        prefetch(buf);
+
+        length = hsreq->req.length - hsreq->req.actual;
+        length = min(length, max);
+        hsreq->req.actual += length;
+
+        writel(length, hsep->dev->regs + S3C_BWCR);
+        for (count = 0; count < length; count += 2)
+                writel(*buf++, fifo);
+
+        if (count != max) {
+                is_last = true;
+        } else {
+                if (hsreq->req.length != hsreq->req.actual || hsreq->req.zero)
+                        is_last = false;
+                else
+                        is_last = true;
+        }
+
+        if (is_last) {
+                s3c_hsudc_complete_request(hsep, hsreq, 0);
+                return 1;
+        }
+
+        return 0;
+}
+
+/**
+ * s3c_hsudc_read_fifo - Read the next chunk of data from EP fifo.
+ * @hsep: Endpoint from which the data is to be read.
+ * @hsreq: Transfer request to which the next chunk of data read is written.
+ *
+ * Read the next chunk of data from the endpoint FIFO and a write it to the
+ * transfer request buffer. If the transfer request completes, 1 is returned,
+ * otherwise 0 is returned.
+ */
+static int s3c_hsudc_read_fifo(struct s3c_hsudc_ep *hsep,
+                                struct s3c_hsudc_req *hsreq)
+{
+        struct s3c_hsudc *hsudc = hsep->dev;
+        u32 csr, offset;
+        u16 *buf, word;
+        u32 buflen, rcnt, rlen;
+        void __iomem *fifo = hsep->fifo;
+        u32 is_short = 0;
+
+        offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR;
+        csr = readl(hsudc->regs + offset);
+        if (!(csr & S3C_ESR_RX_SUCCESS))
+                return -EINVAL;
+
+        buf = hsreq->req.buf + hsreq->req.actual;
+        prefetchw(buf);
+        buflen = hsreq->req.length - hsreq->req.actual;
+
+        rcnt = readl(hsudc->regs + S3C_BRCR);
+        rlen = (csr & S3C_ESR_LWO) ? (rcnt * 2 - 1) : (rcnt * 2);
+
+        hsreq->req.actual += min(rlen, buflen);
+        is_short = (rlen < hsep->ep.maxpacket);
+
+        while (rcnt-- != 0) {
+                word = (u16)readl(fifo);
+                if (buflen) {
+                        *buf++ = word;
+                        buflen--;
+                } else {
+                        hsreq->req.status = -EOVERFLOW;
+                }
+        }
+
+        writel(S3C_ESR_RX_SUCCESS, hsudc->regs + offset);
+
+        if (is_short || hsreq->req.actual == hsreq->req.length) {
+                s3c_hsudc_complete_request(hsep, hsreq, 0);
+                return 1;
+        }
+
+        return 0;
+}
+
+/**
+ * s3c_hsudc_epin_intr - Handle in-endpoint interrupt.
+ * @hsudc - Device controller for which the interrupt is to be handled.
+ * @ep_idx - Endpoint number on which an interrupt is pending.
+ *
+ * Handles interrupt for a in-endpoint. The interrupts that are handled are
+ * stall and data transmit complete interrupt.
+ */
+static void s3c_hsudc_epin_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
+{
+        struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx];
+        struct s3c_hsudc_req *hsreq;
+        u32 csr;
+
+        csr = readl((u32)hsudc->regs + S3C_ESR);
+        if (csr & S3C_ESR_STALL) {
+                writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
+                return;
+        }
+
+        if (csr & S3C_ESR_TX_SUCCESS) {
+                writel(S3C_ESR_TX_SUCCESS, hsudc->regs + S3C_ESR);
+                if (list_empty(&hsep->queue))
+                        return;
+
+                hsreq = list_entry(hsep->queue.next,
+                                struct s3c_hsudc_req, queue);
+                if ((s3c_hsudc_write_fifo(hsep, hsreq) == 0) &&
+                                (csr & S3C_ESR_PSIF_TWO))
+                        s3c_hsudc_write_fifo(hsep, hsreq);
+        }
+}
+
+/**
+ * s3c_hsudc_epout_intr - Handle out-endpoint interrupt.
+ * @hsudc - Device controller for which the interrupt is to be handled.
+ * @ep_idx - Endpoint number on which an interrupt is pending.
+ *
+ * Handles interrupt for a out-endpoint. The interrupts that are handled are
+ * stall, flush and data ready interrupt.
+ */
+static void s3c_hsudc_epout_intr(struct s3c_hsudc *hsudc, u32 ep_idx)
+{
+        struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx];
+        struct s3c_hsudc_req *hsreq;
+        u32 csr;
+
+        csr = readl((u32)hsudc->regs + S3C_ESR);
+        if (csr & S3C_ESR_STALL) {
+                writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR);
+                return;
+        }
+
+        if (csr & S3C_ESR_FLUSH) {
+                __orr32(hsudc->regs + S3C_ECR, S3C_ECR_FLUSH);
+                return;
+        }
+
+        if (csr & S3C_ESR_RX_SUCCESS) {
+                if (list_empty(&hsep->queue))
+                        return;
+
+                hsreq = list_entry(hsep->queue.next,
+                                struct s3c_hsudc_req, queue);
+                if (((s3c_hsudc_read_fifo(hsep, hsreq)) == 0) &&
+                                (csr & S3C_ESR_PSIF_TWO))
+                        s3c_hsudc_read_fifo(hsep, hsreq);
+        }
+}
+
+/** s3c_hsudc_set_halt - Set or clear a endpoint halt.
+ * @_ep: Endpoint on which halt has to be set or cleared.
+ * @value: 1 for setting halt on endpoint, 0 to clear halt.
+ *
+ * Set or clear endpoint halt. If halt is set, the endpoint is stopped.
+ * If halt is cleared, for in-endpoints, if there are any pending
+ * transfer requests, transfers are started.
+ */
+static int s3c_hsudc_set_halt(struct usb_ep *_ep, int value)
+{
+        struct s3c_hsudc_ep *hsep = our_ep(_ep);
+        struct s3c_hsudc *hsudc = hsep->dev;
+        struct s3c_hsudc_req *hsreq;
+        unsigned long irqflags;
+        u32 ecr;
+        u32 offset;
+
+        if (value && ep_is_in(hsep) && !list_empty(&hsep->queue))
+                return -EAGAIN;
+
+        spin_lock_irqsave(&hsudc->lock, irqflags);
+        set_index(hsudc, ep_index(hsep));
+        offset = (ep_index(hsep)) ? S3C_ECR : S3C_EP0CR;
+        ecr = readl(hsudc->regs + offset);
+
+        if (value) {
+                ecr |= S3C_ECR_STALL;
+                if (ep_index(hsep))
+                        ecr |= S3C_ECR_FLUSH;
+                hsep->stopped = 1;
+        } else {
+                ecr &= ~S3C_ECR_STALL;
+                hsep->stopped = hsep->wedge = 0;
+        }
+        writel(ecr, hsudc->regs + offset);
+
+        if (ep_is_in(hsep) && !list_empty(&hsep->queue) && !value) {
+                hsreq = list_entry(hsep->queue.next,
+                        struct s3c_hsudc_req, queue);
+                if (hsreq)
+                        s3c_hsudc_write_fifo(hsep, hsreq);
+        }
+
+        spin_unlock_irqrestore(&hsudc->lock, irqflags);
+        return 0;
+}
+
+/** s3c_hsudc_set_wedge - Sets the halt feature with the clear requests ignored
+ * @_ep: Endpoint on which wedge has to be set.
+ *
+ * Sets the halt feature with the clear requests ignored.
+ */
+static int s3c_hsudc_set_wedge(struct usb_ep *_ep)
+{
+        struct s3c_hsudc_ep *hsep = our_ep(_ep);
+
+        if (!hsep)
+                return -EINVAL;
+
+        hsep->wedge = 1;
+        return usb_ep_set_halt(_ep);
+}
+
+/** s3c_hsudc_handle_reqfeat - Handle set feature or clear feature requests.
+ * @_ep: Device controller on which the set/clear feature needs to be handled.
+ * @ctrl: Control request as received on the endpoint 0.
+ *
+ * Handle set feature or clear feature control requests on the control endpoint.
+ */
+static int s3c_hsudc_handle_reqfeat(struct s3c_hsudc *hsudc,
+                                        struct usb_ctrlrequest *ctrl)
+{
+        struct s3c_hsudc_ep *hsep;
+        bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
+        u8 ep_num = ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK;
+
+        if (ctrl->bRequestType == USB_RECIP_ENDPOINT) {
+                hsep = &hsudc->ep[ep_num];
+                switch (le16_to_cpu(ctrl->wValue)) {
+                case USB_ENDPOINT_HALT:
+                        if (set || (!set && !hsep->wedge))
+                                s3c_hsudc_set_halt(&hsep->ep, set);
+                        return 0;
+                }
+        }
+
+        return -ENOENT;
+}
+
+/**
+ * s3c_hsudc_process_req_status - Handle get status control request.
+ * @hsudc: Device controller on which get status request has be handled.
+ * @ctrl: Control request as received on the endpoint 0.
+ *
+ * Handle get status control request received on control endpoint.
+ */
+static void s3c_hsudc_process_req_status(struct s3c_hsudc *hsudc,
+                                        struct usb_ctrlrequest *ctrl)
+{
+        struct s3c_hsudc_ep *hsep0 = &hsudc->ep[0];
+        struct s3c_hsudc_req hsreq;
+        struct s3c_hsudc_ep *hsep;
+        __le16 reply;
+        u8 epnum;
+
+        switch (ctrl->bRequestType & USB_RECIP_MASK) {
+        case USB_RECIP_DEVICE:
+                reply = cpu_to_le16(0);
+                break;
+
+        case USB_RECIP_INTERFACE:
+                reply = cpu_to_le16(0);
+                break;
+
+        case USB_RECIP_ENDPOINT:
+                epnum = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
+                hsep = &hsudc->ep[epnum];
+                reply = cpu_to_le16(hsep->stopped ? 1 : 0);
+                break;
+        }
+
+        INIT_LIST_HEAD(&hsreq.queue);
+        hsreq.req.length = 2;
+        hsreq.req.buf = &reply;
+        hsreq.req.actual = 0;
+        hsreq.req.complete = NULL;
+        s3c_hsudc_write_fifo(hsep0, &hsreq);
+}
+
+/**
+ * s3c_hsudc_process_setup - Process control request received on endpoint 0.
+ * @hsudc: Device controller on which control request has been received.
+ *
+ * Read the control request received on endpoint 0, decode it and handle
+ * the request.
+ */
+static void s3c_hsudc_process_setup(struct s3c_hsudc *hsudc)
+{
+        struct s3c_hsudc_ep *hsep = &hsudc->ep[0];
+        struct usb_ctrlrequest ctrl = {0};
+        int ret;
+
+        s3c_hsudc_nuke_ep(hsep, -EPROTO);
+        s3c_hsudc_read_setup_pkt(hsudc, (u16 *)&ctrl);
+
+        if (ctrl.bRequestType & USB_DIR_IN) {
+                hsep->bEndpointAddress |= USB_DIR_IN;
+                hsudc->ep0state = DATA_STATE_XMIT;
+        } else {
+                hsep->bEndpointAddress &= ~USB_DIR_IN;
+                hsudc->ep0state = DATA_STATE_RECV;
+        }
+
+        switch (ctrl.bRequest) {
+        case USB_REQ_SET_ADDRESS:
+                if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE))
+                        break;
+                hsudc->ep0state = WAIT_FOR_SETUP;
+                return;
+
+        case USB_REQ_GET_STATUS:
+                if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
+                        break;
+                s3c_hsudc_process_req_status(hsudc, &ctrl);
+                return;
+
+        case USB_REQ_SET_FEATURE:
+        case USB_REQ_CLEAR_FEATURE:
+                if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
+                        break;
+                s3c_hsudc_handle_reqfeat(hsudc, &ctrl);
+                hsudc->ep0state = WAIT_FOR_SETUP;
+                return;
+        }
+
+        if (hsudc->driver) {
+                spin_unlock(&hsudc->lock);
+                ret = hsudc->driver->setup(&hsudc->gadget, &ctrl);
+                spin_lock(&hsudc->lock);
+
+                if (ctrl.bRequest == USB_REQ_SET_CONFIGURATION) {
+                        hsep->bEndpointAddress &= ~USB_DIR_IN;
+                        hsudc->ep0state = WAIT_FOR_SETUP;
+                }
+
+                if (ret < 0) {
+                        dev_err(hsudc->dev, "setup failed, returned %d\n",
+                                                ret);
+                        s3c_hsudc_set_halt(&hsep->ep, 1);
+                        hsudc->ep0state = WAIT_FOR_SETUP;
+                        hsep->bEndpointAddress &= ~USB_DIR_IN;
+                }
+        }
+}
+
+/** s3c_hsudc_handle_ep0_intr - Handle endpoint 0 interrupt.
+ * @hsudc: Device controller on which endpoint 0 interrupt has occured.
+ *
+ * Handle endpoint 0 interrupt when it occurs. EP0 interrupt could occur
+ * when a stall handshake is sent to host or data is sent/received on
+ * endpoint 0.
+ */
+static void s3c_hsudc_handle_ep0_intr(struct s3c_hsudc *hsudc)
+{
+        struct s3c_hsudc_ep *hsep = &hsudc->ep[0];
+        struct s3c_hsudc_req *hsreq;
+        u32 csr = readl(hsudc->regs + S3C_EP0SR);
+        u32 ecr;
+
+        if (csr & S3C_EP0SR_STALL) {
+                ecr = readl(hsudc->regs + S3C_EP0CR);
+                ecr &= ~(S3C_ECR_STALL | S3C_ECR_FLUSH);
+                writel(ecr, hsudc->regs + S3C_EP0CR);
+
+                writel(S3C_EP0SR_STALL, hsudc->regs + S3C_EP0SR);
+                hsep->stopped = 0;
+
+                s3c_hsudc_nuke_ep(hsep, -ECONNABORTED);
+                hsudc->ep0state = WAIT_FOR_SETUP;
+                hsep->bEndpointAddress &= ~USB_DIR_IN;
+                return;
+        }
+
+        if (csr & S3C_EP0SR_TX_SUCCESS) {
+                writel(S3C_EP0SR_TX_SUCCESS, hsudc->regs + S3C_EP0SR);
+                if (ep_is_in(hsep)) {
+                        if (list_empty(&hsep->queue))
+                                return;
+
+                        hsreq = list_entry(hsep->queue.next,
+                                        struct s3c_hsudc_req, queue);
+                        s3c_hsudc_write_fifo(hsep, hsreq);
+                }
+        }
+
+        if (csr & S3C_EP0SR_RX_SUCCESS) {
+                if (hsudc->ep0state == WAIT_FOR_SETUP)
+                        s3c_hsudc_process_setup(hsudc);
+                else {
+                        if (!ep_is_in(hsep)) {
+                                if (list_empty(&hsep->queue))
+                                        return;
+                                hsreq = list_entry(hsep->queue.next,
+                                        struct s3c_hsudc_req, queue);
+                                s3c_hsudc_read_fifo(hsep, hsreq);
+                        }
+                }
+        }
+}
+
+/**
+ * s3c_hsudc_ep_enable - Enable a endpoint.
+ * @_ep: The endpoint to be enabled.
+ * @desc: Endpoint descriptor.
+ *
+ * Enables a endpoint when called from the gadget driver. Endpoint stall if
+ * any is cleared, transfer type is configured and endpoint interrupt is
+ * enabled.
+ */
+static int s3c_hsudc_ep_enable(struct usb_ep *_ep,
+                                const struct usb_endpoint_descriptor *desc)
+{
+        struct s3c_hsudc_ep *hsep;
+        struct s3c_hsudc *hsudc;
+        unsigned long flags;
+        u32 ecr = 0;
+
+        hsep = container_of(_ep, struct s3c_hsudc_ep, ep);
+        if (!_ep || !desc || hsep->desc || _ep->name == ep0name
+                || desc->bDescriptorType != USB_DT_ENDPOINT
+                || hsep->bEndpointAddress != desc->bEndpointAddress
+                || ep_maxpacket(hsep) < le16_to_cpu(desc->wMaxPacketSize))
+                return -EINVAL;
+
+        if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
+                && le16_to_cpu(desc->wMaxPacketSize) != ep_maxpacket(hsep))
+                || !desc->wMaxPacketSize)
+                return -ERANGE;
+
+        hsudc = hsep->dev;
+        if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN)
+                return -ESHUTDOWN;
+
+        spin_lock_irqsave(&hsudc->lock, flags);
+
+        set_index(hsudc, hsep->bEndpointAddress);
+        ecr |= ((usb_endpoint_xfer_int(desc)) ? S3C_ECR_IEMS : S3C_ECR_DUEN);
+        writel(ecr, hsudc->regs + S3C_ECR);
+
+        hsep->stopped = hsep->wedge = 0;
+        hsep->desc = desc;
+        hsep->ep.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
+
+        s3c_hsudc_set_halt(_ep, 0);
+        __set_bit(ep_index(hsep), hsudc->regs + S3C_EIER);
+
+        spin_unlock_irqrestore(&hsudc->lock, flags);
+        return 0;
+}
+
+/**
+ * s3c_hsudc_ep_disable - Disable a endpoint.
+ * @_ep: The endpoint to be disabled.
+ * @desc: Endpoint descriptor.
+ *
+ * Disables a endpoint when called from the gadget driver.
+ */
+static int s3c_hsudc_ep_disable(struct usb_ep *_ep)
+{
+        struct s3c_hsudc_ep *hsep = our_ep(_ep);
+        struct s3c_hsudc *hsudc = hsep->dev;
+        unsigned long flags;
+
+        if (!_ep || !hsep->desc)
+                return -EINVAL;
+
+        spin_lock_irqsave(&hsudc->lock, flags);
+
+        set_index(hsudc, hsep->bEndpointAddress);
+        __clear_bit(ep_index(hsep), hsudc->regs + S3C_EIER);
+
+        s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN);
+
+        hsep->desc = 0;
+        hsep->stopped = 1;
+
+        spin_unlock_irqrestore(&hsudc->lock, flags);
+        return 0;
+}
+
+/**
+ * s3c_hsudc_alloc_request - Allocate a new request.
+ * @_ep: Endpoint for which request is allocated (not used).
+ * @gfp_flags: Flags used for the allocation.
+ *
+ * Allocates a single transfer request structure when called from gadget driver.
+ */
+static struct usb_request *s3c_hsudc_alloc_request(struct usb_ep *_ep,
+                                                gfp_t gfp_flags)
+{
+        struct s3c_hsudc_req *hsreq;
+
+        hsreq = kzalloc(sizeof *hsreq, gfp_flags);
+        if (!hsreq)
+                return 0;
+
+        INIT_LIST_HEAD(&hsreq->queue);
+        return &hsreq->req;
+}
+
+/**
+ * s3c_hsudc_free_request - Deallocate a request.
+ * @ep: Endpoint for which request is deallocated (not used).
+ * @_req: Request to be deallocated.
+ *
+ * Allocates a single transfer request structure when called from gadget driver.
+ */
+static void s3c_hsudc_free_request(struct usb_ep *ep, struct usb_request *_req)
+{
+        struct s3c_hsudc_req *hsreq;
+
+        hsreq = container_of(_req, struct s3c_hsudc_req, req);
+        WARN_ON(!list_empty(&hsreq->queue));
+        kfree(hsreq);
+}
+
+/**
+ * s3c_hsudc_queue - Queue a transfer request for the endpoint.
+ * @_ep: Endpoint for which the request is queued.
+ * @_req: Request to be queued.
+ * @gfp_flags: Not used.
+ *
+ * Start or enqueue a request for a endpoint when called from gadget driver.
+ */
+static int s3c_hsudc_queue(struct usb_ep *_ep, struct usb_request *_req,
+                        gfp_t gfp_flags)
+{
+        struct s3c_hsudc_req *hsreq;
+        struct s3c_hsudc_ep *hsep;
+        struct s3c_hsudc *hsudc;
+        unsigned long flags;
+        u32 offset;
+        u32 csr;
+
+        hsreq = container_of(_req, struct s3c_hsudc_req, req);
+        if ((!_req || !_req->complete || !_req->buf ||
+                !list_empty(&hsreq->queue)))
+                return -EINVAL;
+
+        hsep = container_of(_ep, struct s3c_hsudc_ep, ep);
+        hsudc = hsep->dev;
+        if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN)
+                return -ESHUTDOWN;
+
+        spin_lock_irqsave(&hsudc->lock, flags);
+        set_index(hsudc, hsep->bEndpointAddress);
+
+        _req->status = -EINPROGRESS;
+        _req->actual = 0;
+
+        if (!ep_index(hsep) && _req->length == 0) {
+                hsudc->ep0state = WAIT_FOR_SETUP;
+                s3c_hsudc_complete_request(hsep, hsreq, 0);
+                spin_unlock_irqrestore(&hsudc->lock, flags);
+                return 0;
+        }
+
+        if (list_empty(&hsep->queue) && !hsep->stopped) {
+                offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR;
+                if (ep_is_in(hsep)) {
+                        csr = readl((u32)hsudc->regs + offset);
+                        if (!(csr & S3C_ESR_TX_SUCCESS) &&
+                                (s3c_hsudc_write_fifo(hsep, hsreq) == 1))
+                                hsreq = 0;
+                } else {
+                        csr = readl((u32)hsudc->regs + offset);
+                        if ((csr & S3C_ESR_RX_SUCCESS)
+                                   && (s3c_hsudc_read_fifo(hsep, hsreq) == 1))
+                                hsreq = 0;
+                }
+        }
+
+        if (hsreq != 0)
+                list_add_tail(&hsreq->queue, &hsep->queue);
+
+        spin_unlock_irqrestore(&hsudc->lock, flags);
+        return 0;
+}
+
+/**
+ * s3c_hsudc_dequeue - Dequeue a transfer request from an endpoint.
+ * @_ep: Endpoint from which the request is dequeued.
+ * @_req: Request to be dequeued.
+ *
+ * Dequeue a request from a endpoint when called from gadget driver.
+ */
+static int s3c_hsudc_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+        struct s3c_hsudc_ep *hsep = our_ep(_ep);
+        struct s3c_hsudc *hsudc = hsep->dev;
+        struct s3c_hsudc_req *hsreq;
+        unsigned long flags;
+
+        hsep = container_of(_ep, struct s3c_hsudc_ep, ep);
+        if (!_ep || hsep->ep.name == ep0name)
+                return -EINVAL;
+
+        spin_lock_irqsave(&hsudc->lock, flags);
+
+        list_for_each_entry(hsreq, &hsep->queue, queue) {
+                if (&hsreq->req == _req)
+                        break;
+        }
+        if (&hsreq->req != _req) {
+                spin_unlock_irqrestore(&hsudc->lock, flags);
+                return -EINVAL;
+        }
+
+        set_index(hsudc, hsep->bEndpointAddress);
+        s3c_hsudc_complete_request(hsep, hsreq, -ECONNRESET);
+
+        spin_unlock_irqrestore(&hsudc->lock, flags);
+        return 0;
+}
+
+static struct usb_ep_ops s3c_hsudc_ep_ops = {
+        .enable = s3c_hsudc_ep_enable,
+        .disable = s3c_hsudc_ep_disable,
+        .alloc_request = s3c_hsudc_alloc_request,
+        .free_request = s3c_hsudc_free_request,
+        .queue = s3c_hsudc_queue,
+        .dequeue = s3c_hsudc_dequeue,
+        .set_halt = s3c_hsudc_set_halt,
+        .set_wedge = s3c_hsudc_set_wedge,
+};
+
+/**
+ * s3c_hsudc_initep - Initialize a endpoint to default state.
+ * @hsudc - Reference to the device controller.
+ * @hsep - Endpoint to be initialized.
+ * @epnum - Address to be assigned to the endpoint.
+ *
+ * Initialize a endpoint with default configuration.
+ */
+static void s3c_hsudc_initep(struct s3c_hsudc *hsudc,
+                                struct s3c_hsudc_ep *hsep, int epnum)
+{
+        char *dir;
+
+        if ((epnum % 2) == 0) {
+                dir = "out";
+        } else {
+                dir = "in";
+                hsep->bEndpointAddress = USB_DIR_IN;
+        }
+
+        hsep->bEndpointAddress |= epnum;
+        if (epnum)
+                snprintf(hsep->name, sizeof(hsep->name), "ep%d%s", epnum, dir);
+        else
+                snprintf(hsep->name, sizeof(hsep->name), "%s", ep0name);
+
+        INIT_LIST_HEAD(&hsep->queue);
+        INIT_LIST_HEAD(&hsep->ep.ep_list);
+        if (epnum)
+                list_add_tail(&hsep->ep.ep_list, &hsudc->gadget.ep_list);
+
+        hsep->dev = hsudc;
+        hsep->ep.name = hsep->name;
+        hsep->ep.maxpacket = epnum ? 512 : 64;
+        hsep->ep.ops = &s3c_hsudc_ep_ops;
+        hsep->fifo = hsudc->regs + S3C_BR(epnum);
+        hsep->desc = 0;
+        hsep->stopped = 0;
+        hsep->wedge = 0;
+
+        set_index(hsudc, epnum);
+        writel(hsep->ep.maxpacket, hsudc->regs + S3C_MPR);
+}
+
+/**
+ * s3c_hsudc_setup_ep - Configure all endpoints to default state.
+ * @hsudc: Reference to device controller.
+ *
+ * Configures all endpoints to default state.
+ */
+static void s3c_hsudc_setup_ep(struct s3c_hsudc *hsudc)
+{
+        int epnum;
+
+        hsudc->ep0state = WAIT_FOR_SETUP;
+        INIT_LIST_HEAD(&hsudc->gadget.ep_list);
+        for (epnum = 0; epnum < hsudc->pd->epnum; epnum++)
+                s3c_hsudc_initep(hsudc, &hsudc->ep[epnum], epnum);
+}
+
+/**
+ * s3c_hsudc_reconfig - Reconfigure the device controller to default state.
+ * @hsudc: Reference to device controller.
+ *
+ * Reconfigures the device controller registers to a default state.
+ */
+static void s3c_hsudc_reconfig(struct s3c_hsudc *hsudc)
+{
+        writel(0xAA, hsudc->regs + S3C_EDR);
+        writel(1, hsudc->regs + S3C_EIER);
+        writel(0, hsudc->regs + S3C_TR);
+        writel(S3C_SCR_DTZIEN_EN | S3C_SCR_RRD_EN | S3C_SCR_SUS_EN |
+                        S3C_SCR_RST_EN, hsudc->regs + S3C_SCR);
+        writel(0, hsudc->regs + S3C_EP0CR);
+
+        s3c_hsudc_setup_ep(hsudc);
+}
+
+/**
+ * s3c_hsudc_irq - Interrupt handler for device controller.
+ * @irq: Not used.
+ * @_dev: Reference to the device controller.
+ *
+ * Interrupt handler for the device controller. This handler handles controller
+ * interrupts and endpoint interrupts.
+ */
+static irqreturn_t s3c_hsudc_irq(int irq, void *_dev)
+{
+        struct s3c_hsudc *hsudc = _dev;
+        struct s3c_hsudc_ep *hsep;
+        u32 ep_intr;
+        u32 sys_status;
+        u32 ep_idx;
+
+        spin_lock(&hsudc->lock);
+
+        sys_status = readl(hsudc->regs + S3C_SSR);
+        ep_intr = readl(hsudc->regs + S3C_EIR) & 0x3FF;
+
+        if (!ep_intr && !(sys_status & S3C_SSR_DTZIEN_EN)) {
+                spin_unlock(&hsudc->lock);
+                return IRQ_HANDLED;
+        }
+
+        if (sys_status) {
+                if (sys_status & S3C_SSR_VBUSON)
+                        writel(S3C_SSR_VBUSON, hsudc->regs + S3C_SSR);
+
+                if (sys_status & S3C_SSR_ERR)
+                        writel(S3C_SSR_ERR, hsudc->regs + S3C_SSR);
+
+                if (sys_status & S3C_SSR_SDE) {
+                        writel(S3C_SSR_SDE, hsudc->regs + S3C_SSR);
+                        hsudc->gadget.speed = (sys_status & S3C_SSR_HSP) ?
+                                USB_SPEED_HIGH : USB_SPEED_FULL;
+                }
+
+                if (sys_status & S3C_SSR_SUSPEND) {
+                        writel(S3C_SSR_SUSPEND, hsudc->regs + S3C_SSR);
+                        if (hsudc->gadget.speed != USB_SPEED_UNKNOWN
+                                && hsudc->driver && hsudc->driver->suspend)
+                                hsudc->driver->suspend(&hsudc->gadget);
+                }
+
+                if (sys_status & S3C_SSR_RESUME) {
+                        writel(S3C_SSR_RESUME, hsudc->regs + S3C_SSR);
+                        if (hsudc->gadget.speed != USB_SPEED_UNKNOWN
+                                && hsudc->driver && hsudc->driver->resume)
+                                hsudc->driver->resume(&hsudc->gadget);
+                }
+
+                if (sys_status & S3C_SSR_RESET) {
+                        writel(S3C_SSR_RESET, hsudc->regs + S3C_SSR);
+                        for (ep_idx = 0; ep_idx < hsudc->pd->epnum; ep_idx++) {
+                                hsep = &hsudc->ep[ep_idx];
+                                hsep->stopped = 1;
+                                s3c_hsudc_nuke_ep(hsep, -ECONNRESET);
+                        }
+                        s3c_hsudc_reconfig(hsudc);
+                        hsudc->ep0state = WAIT_FOR_SETUP;
+                }
+        }
+
+        if (ep_intr & S3C_EIR_EP0) {
+                writel(S3C_EIR_EP0, hsudc->regs + S3C_EIR);
+                set_index(hsudc, 0);
+                s3c_hsudc_handle_ep0_intr(hsudc);
+        }
+
+        ep_intr >>= 1;
+        ep_idx = 1;
+        while (ep_intr) {
+                if (ep_intr & 1)  {
+                        hsep = &hsudc->ep[ep_idx];
+                        set_index(hsudc, ep_idx);
+                        writel(1 << ep_idx, hsudc->regs + S3C_EIR);
+                        if (ep_is_in(hsep))
+                                s3c_hsudc_epin_intr(hsudc, ep_idx);
+                        else
+                                s3c_hsudc_epout_intr(hsudc, ep_idx);
+                }
+                ep_intr >>= 1;
+                ep_idx++;
+        }
+
+        spin_unlock(&hsudc->lock);
+        return IRQ_HANDLED;
+}
+
+int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
+               int (*bind)(struct usb_gadget *))
+{
+        struct s3c_hsudc *hsudc = the_controller;
+        int ret;
+
+        if (!driver
+                || (driver->speed != USB_SPEED_FULL &&
+                        driver->speed != USB_SPEED_HIGH)
+                || !bind
+                || !driver->unbind || !driver->disconnect || !driver->setup)
+                return -EINVAL;
+
+        if (!hsudc)
+                return -ENODEV;
+
+        if (hsudc->driver)
+                return -EBUSY;
+
+        hsudc->driver = driver;
+        hsudc->gadget.dev.driver = &driver->driver;
+        hsudc->gadget.speed = USB_SPEED_UNKNOWN;
+        ret = device_add(&hsudc->gadget.dev);
+        if (ret) {
+                dev_err(hsudc->dev, "failed to probe gadget device");
+                return ret;
+        }
+
+        ret = bind(&hsudc->gadget);
+        if (ret) {
+                dev_err(hsudc->dev, "%s: bind failed\n", hsudc->gadget.name);
+                device_del(&hsudc->gadget.dev);
+
+                hsudc->driver = NULL;
+                hsudc->gadget.dev.driver = NULL;
+                return ret;
+        }
+
+        enable_irq(hsudc->irq);
+        dev_info(hsudc->dev, "bound driver %s\n", driver->driver.name);
+
+        s3c_hsudc_reconfig(hsudc);
+        s3c_hsudc_init_phy();
+        if (hsudc->pd->gpio_init)
+                hsudc->pd->gpio_init();
+
+        return 0;
+}
+EXPORT_SYMBOL(usb_gadget_probe_driver);
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+        struct s3c_hsudc *hsudc = the_controller;
+        unsigned long flags;
+
+        if (!hsudc)
+                return -ENODEV;
+
+        if (!driver || driver != hsudc->driver || !driver->unbind)
+                return -EINVAL;
+
+        spin_lock_irqsave(&hsudc->lock, flags);
+        hsudc->driver = 0;
+        s3c_hsudc_uninit_phy();
+        if (hsudc->pd->gpio_uninit)
+                hsudc->pd->gpio_uninit();
+        s3c_hsudc_stop_activity(hsudc, driver);
+        spin_unlock_irqrestore(&hsudc->lock, flags);
+
+        driver->unbind(&hsudc->gadget);
+        device_del(&hsudc->gadget.dev);
+        disable_irq(hsudc->irq);
+
+        dev_info(hsudc->dev, "unregistered gadget driver '%s'\n",
+                        driver->driver.name);
+        return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+static inline u32 s3c_hsudc_read_frameno(struct s3c_hsudc *hsudc)
+{
+        return readl(hsudc->regs + S3C_FNR) & 0x3FF;
+}
+
+static int s3c_hsudc_gadget_getframe(struct usb_gadget *gadget)
+{
+        return s3c_hsudc_read_frameno(to_hsudc(gadget));
+}
+
+static struct usb_gadget_ops s3c_hsudc_gadget_ops = {
+        .get_frame      = s3c_hsudc_gadget_getframe,
+};
+
+static int s3c_hsudc_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct resource *res;
+        struct s3c_hsudc *hsudc;
+        struct s3c24xx_hsudc_platdata *pd = pdev->dev.platform_data;
+        int ret;
+
+        hsudc = kzalloc(sizeof(struct s3c_hsudc) +
+                        sizeof(struct s3c_hsudc_ep) * pd->epnum,
+                        GFP_KERNEL);
+        if (!hsudc) {
+                dev_err(dev, "cannot allocate memory\n");
+                return -ENOMEM;
+        }
+
+        the_controller = hsudc;
+        platform_set_drvdata(pdev, dev);
+        hsudc->dev = dev;
+        hsudc->pd = pdev->dev.platform_data;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(dev, "unable to obtain driver resource data\n");
+                ret = -ENODEV;
+                goto err_res;
+        }
+
+        hsudc->mem_rsrc = request_mem_region(res->start, resource_size(res),
+                                dev_name(&pdev->dev));
+        if (!hsudc->mem_rsrc) {
+                dev_err(dev, "failed to reserve register area\n");
+                ret = -ENODEV;
+                goto err_res;
+        }
+
+        hsudc->regs = ioremap(res->start, resource_size(res));
+        if (!hsudc->regs) {
+                dev_err(dev, "error mapping device register area\n");
+                ret = -EBUSY;
+                goto err_remap;
+        }
+
+        ret = platform_get_irq(pdev, 0);
+        if (ret < 0) {
+                dev_err(dev, "unable to obtain IRQ number\n");
+                goto err_irq;
+        }
+        hsudc->irq = ret;
+
+        ret = request_irq(hsudc->irq, s3c_hsudc_irq, 0, driver_name, hsudc);
+        if (ret < 0) {
+                dev_err(dev, "irq request failed\n");
+                goto err_irq;
+        }
+
+        spin_lock_init(&hsudc->lock);
+
+        device_initialize(&hsudc->gadget.dev);
+        dev_set_name(&hsudc->gadget.dev, "gadget");
+
+        hsudc->gadget.is_dualspeed = 1;
+        hsudc->gadget.ops = &s3c_hsudc_gadget_ops;
+        hsudc->gadget.name = dev_name(dev);
+        hsudc->gadget.dev.parent = dev;
+        hsudc->gadget.dev.dma_mask = dev->dma_mask;
+        hsudc->gadget.ep0 = &hsudc->ep[0].ep;
+
+        hsudc->gadget.is_otg = 0;
+        hsudc->gadget.is_a_peripheral = 0;
+
+        s3c_hsudc_setup_ep(hsudc);
+
+        hsudc->uclk = clk_get(&pdev->dev, "usb-device");
+        if (hsudc->uclk == NULL) {
+                dev_err(dev, "failed to find usb-device clock source\n");
+                return -ENOENT;
+        }
+        clk_enable(hsudc->uclk);
+
+        local_irq_disable();
+
+        disable_irq(hsudc->irq);
+        local_irq_enable();
+        return 0;
+
+err_irq:
+        iounmap(hsudc->regs);
+
+err_remap:
+        release_resource(hsudc->mem_rsrc);
+        kfree(hsudc->mem_rsrc);
+
+err_res:
+        kfree(hsudc);
+        return ret;
+}
+
+static struct platform_driver s3c_hsudc_driver = {
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = "s3c-hsudc",
+        },
+        .probe          = s3c_hsudc_probe,
+};
+
+static int __init s3c_hsudc_modinit(void)
+{
+        return platform_driver_register(&s3c_hsudc_driver);
+}
+
+static void __exit s3c_hsudc_modexit(void)
+{
+        platform_driver_unregister(&s3c_hsudc_driver);
+}
+
+module_init(s3c_hsudc_modinit);
+module_exit(s3c_hsudc_modexit);
+
+MODULE_DESCRIPTION("Samsung S3C24XX USB high-speed controller driver");
+MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
+MODULE_LICENSE("GPL");