drivers/usb/gadget/s3c_udc_otg.c - github/trini/u-boot - Gitiles

 /*
  * drivers/usb/gadget/s3c_udc_otg.c
  * Samsung S3C on-chip full/high speed USB OTG 2.0 device controllers
  *
  * Copyright (C) 2008 for Samsung Electronics
  *
  * BSP Support for Samsung's UDC driver
  * available at:
  * git://git.kernel.org/pub/scm/linux/kernel/git/kki_ap/linux-2.6-samsung.git
  *
  * State machine bugfixes:
  * Marek Szyprowski <m.szyprowski@samsung.com>
  *
  * Ported to u-boot:
  * Marek Szyprowski <m.szyprowski@samsung.com>
  * Lukasz Majewski <l.majewski@samsumg.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
 #undef DEBUG
 #include <common.h>
 #include <asm/errno.h>
 #include <linux/list.h>
 #include <malloc.h>

 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>

 #include <asm/byteorder.h>
 #include <asm/unaligned.h>
 #include <asm/io.h>

 #include <asm/mach-types.h>

 #include "regs-otg.h"
 #include <usb/lin_gadget_compat.h>

 /***********************************************************/

 #define OTG_DMA_MODE		1

 #define DEBUG_SETUP 0
 #define DEBUG_EP0 0
 #define DEBUG_ISR 0
 #define DEBUG_OUT_EP 0
 #define DEBUG_IN_EP 0

 #include <usb/s3c_udc.h>

 #define EP0_CON		0
 #define EP_MASK		0xF

 static char *state_names[] = {
 	"WAIT_FOR_SETUP",
 	"DATA_STATE_XMIT",
 	"DATA_STATE_NEED_ZLP",
 	"WAIT_FOR_OUT_STATUS",
 	"DATA_STATE_RECV",
 	"WAIT_FOR_COMPLETE",
 	"WAIT_FOR_OUT_COMPLETE",
 	"WAIT_FOR_IN_COMPLETE",
 	"WAIT_FOR_NULL_COMPLETE",
 };

 #define DRIVER_DESC "S3C HS USB OTG Device Driver, (c) Samsung Electronics"
 #define DRIVER_VERSION "15 March 2009"

 struct s3c_udc	*the_controller;

 static const char driver_name[] = "s3c-udc";
 static const char driver_desc[] = DRIVER_DESC;
 static const char ep0name[] = "ep0-control";

 /* Max packet size*/
 static unsigned int ep0_fifo_size = 64;
 static unsigned int ep_fifo_size =  512;
 static unsigned int ep_fifo_size2 = 1024;
 static int reset_available = 1;

 static struct usb_ctrlrequest *usb_ctrl;
 static dma_addr_t usb_ctrl_dma_addr;

 /*
   Local declarations.
 */
 static int s3c_ep_enable(struct usb_ep *ep,
 			 const struct usb_endpoint_descriptor *);
 static int s3c_ep_disable(struct usb_ep *ep);
 static struct usb_request *s3c_alloc_request(struct usb_ep *ep,
 					     gfp_t gfp_flags);
 static void s3c_free_request(struct usb_ep *ep, struct usb_request *);

 static int s3c_queue(struct usb_ep *ep, struct usb_request *, gfp_t gfp_flags);
 static int s3c_dequeue(struct usb_ep *ep, struct usb_request *);
 static int s3c_fifo_status(struct usb_ep *ep);
 static void s3c_fifo_flush(struct usb_ep *ep);
 static void s3c_ep0_read(struct s3c_udc *dev);
 static void s3c_ep0_kick(struct s3c_udc *dev, struct s3c_ep *ep);
 static void s3c_handle_ep0(struct s3c_udc *dev);
 static int s3c_ep0_write(struct s3c_udc *dev);
 static int write_fifo_ep0(struct s3c_ep *ep, struct s3c_request *req);
 static void done(struct s3c_ep *ep, struct s3c_request *req, int status);
 static void stop_activity(struct s3c_udc *dev,
 			  struct usb_gadget_driver *driver);
 static int udc_enable(struct s3c_udc *dev);
 static void udc_set_address(struct s3c_udc *dev, unsigned char address);
 static void reconfig_usbd(struct s3c_udc *dev);
 static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed);
 static void nuke(struct s3c_ep *ep, int status);
 static int s3c_udc_set_halt(struct usb_ep *_ep, int value);
 static void s3c_udc_set_nak(struct s3c_ep *ep);

 void set_udc_gadget_private_data(void *p)
 {
 	debug_cond(DEBUG_SETUP != 0,
 		   "%s: the_controller: 0x%p, p: 0x%p\n", __func__,
 		   the_controller, p);
 	the_controller->gadget.dev.device_data = p;
 }

 void *get_udc_gadget_private_data(struct usb_gadget *gadget)
 {
 	return gadget->dev.device_data;
 }

 static struct usb_ep_ops s3c_ep_ops = {
 	.enable = s3c_ep_enable,
 	.disable = s3c_ep_disable,

 	.alloc_request = s3c_alloc_request,
 	.free_request = s3c_free_request,

 	.queue = s3c_queue,
 	.dequeue = s3c_dequeue,

 	.set_halt = s3c_udc_set_halt,
 	.fifo_status = s3c_fifo_status,
 	.fifo_flush = s3c_fifo_flush,
 };

 #define create_proc_files() do {} while (0)
 #define remove_proc_files() do {} while (0)

 /***********************************************************/

 void __iomem		*regs_otg;
 struct s3c_usbotg_reg *reg;

 bool dfu_usb_get_reset(void)
 {
 	return !!(readl(&reg->gintsts) & INT_RESET);
 }

 __weak void otg_phy_init(struct s3c_udc *dev) {}
 __weak void otg_phy_off(struct s3c_udc *dev) {}

 /***********************************************************/

 #include "s3c_udc_otg_xfer_dma.c"

 /*
  *	udc_disable - disable USB device controller
  */
 static void udc_disable(struct s3c_udc *dev)
 {
 	debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);

 	udc_set_address(dev, 0);

 	dev->ep0state = WAIT_FOR_SETUP;
 	dev->gadget.speed = USB_SPEED_UNKNOWN;
 	dev->usb_address = 0;

 	otg_phy_off(dev);
 }

 /*
  *	udc_reinit - initialize software state
  */
 static void udc_reinit(struct s3c_udc *dev)
 {
 	unsigned int i;

 	debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);

 	/* device/ep0 records init */
 	INIT_LIST_HEAD(&dev->gadget.ep_list);
 	INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
 	dev->ep0state = WAIT_FOR_SETUP;

 	/* basic endpoint records init */
 	for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 		struct s3c_ep *ep = &dev->ep[i];

 		if (i != 0)
 			list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);

 		ep->desc = 0;
 		ep->stopped = 0;
 		INIT_LIST_HEAD(&ep->queue);
 		ep->pio_irqs = 0;
 	}

 	/* the rest was statically initialized, and is read-only */
 }

 #define BYTES2MAXP(x)	(x / 8)
 #define MAXP2BYTES(x)	(x * 8)

 /* until it's enabled, this UDC should be completely invisible
  * to any USB host.
  */
 static int udc_enable(struct s3c_udc *dev)
 {
 	debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);

 	otg_phy_init(dev);
 	reconfig_usbd(dev);

 	debug_cond(DEBUG_SETUP != 0,
 		   "S3C USB 2.0 OTG Controller Core Initialized : 0x%x\n",
 		    readl(&reg->gintmsk));

 	dev->gadget.speed = USB_SPEED_UNKNOWN;

 	return 0;
 }

 /*
   Register entry point for the peripheral controller driver.
 */
 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 {
 	struct s3c_udc *dev = the_controller;
 	int retval = 0;
 	unsigned long flags = 0;

 	debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");

 	if (!driver
 	    || (driver->speed != USB_SPEED_FULL
 		&& driver->speed != USB_SPEED_HIGH)
 	    || !driver->bind || !driver->disconnect || !driver->setup)
 		return -EINVAL;
 	if (!dev)
 		return -ENODEV;
 	if (dev->driver)
 		return -EBUSY;

 	spin_lock_irqsave(&dev->lock, flags);
 	/* first hook up the driver ... */
 	dev->driver = driver;
 	spin_unlock_irqrestore(&dev->lock, flags);

 	if (retval) { /* TODO */
 		printf("target device_add failed, error %d\n", retval);
 		return retval;
 	}

 	retval = driver->bind(&dev->gadget);
 	if (retval) {
 		debug_cond(DEBUG_SETUP != 0,
 			   "%s: bind to driver --> error %d\n",
 			    dev->gadget.name, retval);
 		dev->driver = 0;
 		return retval;
 	}

 	enable_irq(IRQ_OTG);

 	debug_cond(DEBUG_SETUP != 0,
 		   "Registered gadget driver %s\n", dev->gadget.name);
 	udc_enable(dev);

 	return 0;
 }

 /*
  * Unregister entry point for the peripheral controller driver.
  */
 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 {
 	struct s3c_udc *dev = the_controller;
 	unsigned long flags = 0;

 	if (!dev)
 		return -ENODEV;
 	if (!driver || driver != dev->driver)
 		return -EINVAL;

 	spin_lock_irqsave(&dev->lock, flags);
 	dev->driver = 0;
 	stop_activity(dev, driver);
 	spin_unlock_irqrestore(&dev->lock, flags);

 	driver->unbind(&dev->gadget);

 	disable_irq(IRQ_OTG);

 	udc_disable(dev);
 	return 0;
 }

 /*
  *	done - retire a request; caller blocked irqs
  */
 static void done(struct s3c_ep *ep, struct s3c_request *req, int status)
 {
 	unsigned int stopped = ep->stopped;

 	debug("%s: %s %p, req = %p, stopped = %d\n",
 	      __func__, ep->ep.name, ep, &req->req, stopped);

 	list_del_init(&req->queue);

 	if (likely(req->req.status == -EINPROGRESS))
 		req->req.status = status;
 	else
 		status = req->req.status;

 	if (status && status != -ESHUTDOWN) {
 		debug("complete %s req %p stat %d len %u/%u\n",
 		      ep->ep.name, &req->req, status,
 		      req->req.actual, req->req.length);
 	}

 	/* don't modify queue heads during completion callback */
 	ep->stopped = 1;

 #ifdef DEBUG
 	printf("calling complete callback\n");
 	{
 		int i, len = req->req.length;

 		printf("pkt[%d] = ", req->req.length);
 		if (len > 64)
 			len = 64;
 		for (i = 0; i < len; i++) {
 			printf("%02x", ((u8 *)req->req.buf)[i]);
 			if ((i & 7) == 7)
 				printf(" ");
 		}
 		printf("\n");
 	}
 #endif
 	spin_unlock(&ep->dev->lock);
 	req->req.complete(&ep->ep, &req->req);
 	spin_lock(&ep->dev->lock);

 	debug("callback completed\n");

 	ep->stopped = stopped;
 }

 /*
  *	nuke - dequeue ALL requests
  */
 static void nuke(struct s3c_ep *ep, int status)
 {
 	struct s3c_request *req;

 	debug("%s: %s %p\n", __func__, ep->ep.name, ep);

 	/* called with irqs blocked */
 	while (!list_empty(&ep->queue)) {
 		req = list_entry(ep->queue.next, struct s3c_request, queue);
 		done(ep, req, status);
 	}
 }

 static void stop_activity(struct s3c_udc *dev,
 			  struct usb_gadget_driver *driver)
 {
 	int i;

 	/* don't disconnect drivers more than once */
 	if (dev->gadget.speed == USB_SPEED_UNKNOWN)
 		driver = 0;
 	dev->gadget.speed = USB_SPEED_UNKNOWN;

 	/* prevent new request submissions, kill any outstanding requests  */
 	for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
 		struct s3c_ep *ep = &dev->ep[i];
 		ep->stopped = 1;
 		nuke(ep, -ESHUTDOWN);
 	}

 	/* report disconnect; the driver is already quiesced */
 	if (driver) {
 		spin_unlock(&dev->lock);
 		driver->disconnect(&dev->gadget);
 		spin_lock(&dev->lock);
 	}

 	/* re-init driver-visible data structures */
 	udc_reinit(dev);
 }

 static void reconfig_usbd(struct s3c_udc *dev)
 {
 	/* 2. Soft-reset OTG Core and then unreset again. */
 	int i;
 	unsigned int uTemp = writel(CORE_SOFT_RESET, &reg->grstctl);
 	uint32_t dflt_gusbcfg;

 	debug("Reseting OTG controller\n");

 	dflt_gusbcfg =
 		0<<15		/* PHY Low Power Clock sel*/
 		|1<<14		/* Non-Periodic TxFIFO Rewind Enable*/
 		|0x5<<10	/* Turnaround time*/
 		|0<<9 | 0<<8	/* [0:HNP disable,1:HNP enable][ 0:SRP disable*/
 				/* 1:SRP enable] H1= 1,1*/
 		|0<<7		/* Ulpi DDR sel*/
 		|0<<6		/* 0: high speed utmi+, 1: full speed serial*/
 		|0<<4		/* 0: utmi+, 1:ulpi*/
 		|1<<3		/* phy i/f  0:8bit, 1:16bit*/
 		|0x7<<0;	/* HS/FS Timeout**/

 	if (dev->pdata->usb_gusbcfg)
 		dflt_gusbcfg = dev->pdata->usb_gusbcfg;

 	writel(dflt_gusbcfg, &reg->gusbcfg);

 	/* 3. Put the OTG device core in the disconnected state.*/
 	uTemp = readl(&reg->dctl);
 	uTemp |= SOFT_DISCONNECT;
 	writel(uTemp, &reg->dctl);

 	udelay(20);

 	/* 4. Make the OTG device core exit from the disconnected state.*/
 	uTemp = readl(&reg->dctl);
 	uTemp = uTemp & ~SOFT_DISCONNECT;
 	writel(uTemp, &reg->dctl);

 	/* 5. Configure OTG Core to initial settings of device mode.*/
 	/* [][1: full speed(30Mhz) 0:high speed]*/
 	writel(EP_MISS_CNT(1) | DEV_SPEED_HIGH_SPEED_20, &reg->dcfg);

 	mdelay(1);

 	/* 6. Unmask the core interrupts*/
 	writel(GINTMSK_INIT, &reg->gintmsk);

 	/* 7. Set NAK bit of EP0, EP1, EP2*/
 	writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[EP0_CON].doepctl);
 	writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[EP0_CON].diepctl);

 	for (i = 1; i < S3C_MAX_ENDPOINTS; i++) {
 		writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[i].doepctl);
 		writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[i].diepctl);
 	}

 	/* 8. Unmask EPO interrupts*/
 	writel(((1 << EP0_CON) << DAINT_OUT_BIT)
 	       | (1 << EP0_CON), &reg->daintmsk);

 	/* 9. Unmask device OUT EP common interrupts*/
 	writel(DOEPMSK_INIT, &reg->doepmsk);

 	/* 10. Unmask device IN EP common interrupts*/
 	writel(DIEPMSK_INIT, &reg->diepmsk);

 	/* 11. Set Rx FIFO Size (in 32-bit words) */
 	writel(RX_FIFO_SIZE >> 2, &reg->grxfsiz);

 	/* 12. Set Non Periodic Tx FIFO Size */
 	writel((NPTX_FIFO_SIZE >> 2) << 16 | ((RX_FIFO_SIZE >> 2)) << 0,
 	       &reg->gnptxfsiz);

 	for (i = 1; i < S3C_MAX_HW_ENDPOINTS; i++)
 		writel((PTX_FIFO_SIZE >> 2) << 16 |
 		       ((RX_FIFO_SIZE + NPTX_FIFO_SIZE +
 			 PTX_FIFO_SIZE*(i-1)) >> 2) << 0,
 		       &reg->dieptxf[i-1]);

 	/* Flush the RX FIFO */
 	writel(RX_FIFO_FLUSH, &reg->grstctl);
 	while (readl(&reg->grstctl) & RX_FIFO_FLUSH)
 		debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);

 	/* Flush all the Tx FIFO's */
 	writel(TX_FIFO_FLUSH_ALL, &reg->grstctl);
 	writel(TX_FIFO_FLUSH_ALL | TX_FIFO_FLUSH, &reg->grstctl);
 	while (readl(&reg->grstctl) & TX_FIFO_FLUSH)
 		debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);

 	/* 13. Clear NAK bit of EP0, EP1, EP2*/
 	/* For Slave mode*/
 	/* EP0: Control OUT */
 	writel(DEPCTL_EPDIS | DEPCTL_CNAK,
 	       &reg->out_endp[EP0_CON].doepctl);

 	/* 14. Initialize OTG Link Core.*/
 	writel(GAHBCFG_INIT, &reg->gahbcfg);
 }

 static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed)
 {
 	unsigned int ep_ctrl;
 	int i;

 	if (speed == USB_SPEED_HIGH) {
 		ep0_fifo_size = 64;
 		ep_fifo_size = 512;
 		ep_fifo_size2 = 1024;
 		dev->gadget.speed = USB_SPEED_HIGH;
 	} else {
 		ep0_fifo_size = 64;
 		ep_fifo_size = 64;
 		ep_fifo_size2 = 64;
 		dev->gadget.speed = USB_SPEED_FULL;
 	}

 	dev->ep[0].ep.maxpacket = ep0_fifo_size;
 	for (i = 1; i < S3C_MAX_ENDPOINTS; i++)
 		dev->ep[i].ep.maxpacket = ep_fifo_size;

 	/* EP0 - Control IN (64 bytes)*/
 	ep_ctrl = readl(&reg->in_endp[EP0_CON].diepctl);
 	writel(ep_ctrl|(0<<0), &reg->in_endp[EP0_CON].diepctl);

 	/* EP0 - Control OUT (64 bytes)*/
 	ep_ctrl = readl(&reg->out_endp[EP0_CON].doepctl);
 	writel(ep_ctrl|(0<<0), &reg->out_endp[EP0_CON].doepctl);
 }

 static int s3c_ep_enable(struct usb_ep *_ep,
 			 const struct usb_endpoint_descriptor *desc)
 {
 	struct s3c_ep *ep;
 	struct s3c_udc *dev;
 	unsigned long flags = 0;

 	debug("%s: %p\n", __func__, _ep);

 	ep = container_of(_ep, struct s3c_ep, ep);
 	if (!_ep || !desc || ep->desc || _ep->name == ep0name
 	    || desc->bDescriptorType != USB_DT_ENDPOINT
 	    || ep->bEndpointAddress != desc->bEndpointAddress
 	    || ep_maxpacket(ep) <
 	    le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {

 		debug("%s: bad ep or descriptor\n", __func__);
 		return -EINVAL;
 	}

 	/* xfer types must match, except that interrupt ~= bulk */
 	if (ep->bmAttributes != desc->bmAttributes
 	    && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 	    && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {

 		debug("%s: %s type mismatch\n", __func__, _ep->name);
 		return -EINVAL;
 	}

 	/* hardware _could_ do smaller, but driver doesn't */
 	if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
 	     && le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) !=
 	     ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) {

 		debug("%s: bad %s maxpacket\n", __func__, _ep->name);
 		return -ERANGE;
 	}

 	dev = ep->dev;
 	if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {

 		debug("%s: bogus device state\n", __func__);
 		return -ESHUTDOWN;
 	}

 	ep->stopped = 0;
 	ep->desc = desc;
 	ep->pio_irqs = 0;
 	ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));

 	/* Reset halt state */
 	s3c_udc_set_nak(ep);
 	s3c_udc_set_halt(_ep, 0);

 	spin_lock_irqsave(&ep->dev->lock, flags);
 	s3c_udc_ep_activate(ep);
 	spin_unlock_irqrestore(&ep->dev->lock, flags);

 	debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
 	      __func__, _ep->name, ep->stopped, ep->ep.maxpacket);
 	return 0;
 }

 /*
  * Disable EP
  */
 static int s3c_ep_disable(struct usb_ep *_ep)
 {
 	struct s3c_ep *ep;
 	unsigned long flags = 0;

 	debug("%s: %p\n", __func__, _ep);

 	ep = container_of(_ep, struct s3c_ep, ep);
 	if (!_ep || !ep->desc) {
 		debug("%s: %s not enabled\n", __func__,
 		      _ep ? ep->ep.name : NULL);
 		return -EINVAL;
 	}

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

 	/* Nuke all pending requests */
 	nuke(ep, -ESHUTDOWN);

 	ep->desc = 0;
 	ep->stopped = 1;

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

 	debug("%s: disabled %s\n", __func__, _ep->name);
 	return 0;
 }

 static struct usb_request *s3c_alloc_request(struct usb_ep *ep,
 					     gfp_t gfp_flags)
 {
 	struct s3c_request *req;

 	debug("%s: %s %p\n", __func__, ep->name, ep);

 	req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
 	if (!req)
 		return 0;

 	memset(req, 0, sizeof *req);
 	INIT_LIST_HEAD(&req->queue);

 	return &req->req;
 }

 static void s3c_free_request(struct usb_ep *ep, struct usb_request *_req)
 {
 	struct s3c_request *req;

 	debug("%s: %p\n", __func__, ep);

 	req = container_of(_req, struct s3c_request, req);
 	WARN_ON(!list_empty(&req->queue));
 	kfree(req);
 }

 /* dequeue JUST ONE request */
 static int s3c_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 {
 	struct s3c_ep *ep;
 	struct s3c_request *req;
 	unsigned long flags = 0;

 	debug("%s: %p\n", __func__, _ep);

 	ep = container_of(_ep, struct s3c_ep, ep);
 	if (!_ep || ep->ep.name == ep0name)
 		return -EINVAL;

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

 	/* make sure it's actually queued on this endpoint */
 	list_for_each_entry(req, &ep->queue, queue) {
 		if (&req->req == _req)
 			break;
 	}
 	if (&req->req != _req) {
 		spin_unlock_irqrestore(&ep->dev->lock, flags);
 		return -EINVAL;
 	}

 	done(ep, req, -ECONNRESET);

 	spin_unlock_irqrestore(&ep->dev->lock, flags);
 	return 0;
 }

 /*
  * Return bytes in EP FIFO
  */
 static int s3c_fifo_status(struct usb_ep *_ep)
 {
 	int count = 0;
 	struct s3c_ep *ep;

 	ep = container_of(_ep, struct s3c_ep, ep);
 	if (!_ep) {
 		debug("%s: bad ep\n", __func__);
 		return -ENODEV;
 	}

 	debug("%s: %d\n", __func__, ep_index(ep));

 	/* LPD can't report unclaimed bytes from IN fifos */
 	if (ep_is_in(ep))
 		return -EOPNOTSUPP;

 	return count;
 }

 /*
  * Flush EP FIFO
  */
 static void s3c_fifo_flush(struct usb_ep *_ep)
 {
 	struct s3c_ep *ep;

 	ep = container_of(_ep, struct s3c_ep, ep);
 	if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 		debug("%s: bad ep\n", __func__);
 		return;
 	}

 	debug("%s: %d\n", __func__, ep_index(ep));
 }

 static const struct usb_gadget_ops s3c_udc_ops = {
 	/* current versions must always be self-powered */
 };

 static struct s3c_udc memory = {
 	.usb_address = 0,
 	.gadget = {
 		.ops = &s3c_udc_ops,
 		.ep0 = &memory.ep[0].ep,
 		.name = driver_name,
 	},

 	/* control endpoint */
 	.ep[0] = {
 		.ep = {
 			.name = ep0name,
 			.ops = &s3c_ep_ops,
 			.maxpacket = EP0_FIFO_SIZE,
 		},
 		.dev = &memory,

 		.bEndpointAddress = 0,
 		.bmAttributes = 0,

 		.ep_type = ep_control,
 	},

 	/* first group of endpoints */
 	.ep[1] = {
 		.ep = {
 			.name = "ep1in-bulk",
 			.ops = &s3c_ep_ops,
 			.maxpacket = EP_FIFO_SIZE,
 		},
 		.dev = &memory,

 		.bEndpointAddress = USB_DIR_IN | 1,
 		.bmAttributes = USB_ENDPOINT_XFER_BULK,

 		.ep_type = ep_bulk_out,
 		.fifo_num = 1,
 	},

 	.ep[2] = {
 		.ep = {
 			.name = "ep2out-bulk",
 			.ops = &s3c_ep_ops,
 			.maxpacket = EP_FIFO_SIZE,
 		},
 		.dev = &memory,

 		.bEndpointAddress = USB_DIR_OUT | 2,
 		.bmAttributes = USB_ENDPOINT_XFER_BULK,

 		.ep_type = ep_bulk_in,
 		.fifo_num = 2,
 	},

 	.ep[3] = {
 		.ep = {
 			.name = "ep3in-int",
 			.ops = &s3c_ep_ops,
 			.maxpacket = EP_FIFO_SIZE,
 		},
 		.dev = &memory,

 		.bEndpointAddress = USB_DIR_IN | 3,
 		.bmAttributes = USB_ENDPOINT_XFER_INT,

 		.ep_type = ep_interrupt,
 		.fifo_num = 3,
 	},
 };

 /*
  *	probe - binds to the platform device
  */

 int s3c_udc_probe(struct s3c_plat_otg_data *pdata)
 {
 	struct s3c_udc *dev = &memory;
 	int retval = 0;

 	debug("%s: %p\n", __func__, pdata);

 	dev->pdata = pdata;

 	reg = (struct s3c_usbotg_reg *)pdata->regs_otg;

 	/* regs_otg = (void *)pdata->regs_otg; */

 	dev->gadget.is_dualspeed = 1;	/* Hack only*/
 	dev->gadget.is_otg = 0;
 	dev->gadget.is_a_peripheral = 0;
 	dev->gadget.b_hnp_enable = 0;
 	dev->gadget.a_hnp_support = 0;
 	dev->gadget.a_alt_hnp_support = 0;

 	the_controller = dev;

 	usb_ctrl = memalign(CONFIG_SYS_CACHELINE_SIZE,
 			    ROUND(sizeof(struct usb_ctrlrequest),
 				  CONFIG_SYS_CACHELINE_SIZE));
 	if (!usb_ctrl) {
 		error("No memory available for UDC!\n");
 		return -ENOMEM;
 	}

 	usb_ctrl_dma_addr = (dma_addr_t) usb_ctrl;

 	udc_reinit(dev);

 	return retval;
 }

 int usb_gadget_handle_interrupts()
 {
 	u32 intr_status = readl(&reg->gintsts);
 	u32 gintmsk = readl(&reg->gintmsk);

 	if (intr_status & gintmsk)
 		return s3c_udc_irq(1, (void *)the_controller);
 	return 0;
 }
	/*
	* drivers/usb/gadget/s3c_udc_otg.c
	* Samsung S3C on-chip full/high speed USB OTG 2.0 device controllers
	*
	* Copyright (C) 2008 for Samsung Electronics
	*
	* BSP Support for Samsung's UDC driver
	* available at:
	* git://git.kernel.org/pub/scm/linux/kernel/git/kki_ap/linux-2.6-samsung.git
	*
	* State machine bugfixes:
	* Marek Szyprowski <m.szyprowski@samsung.com>
	*
	* Ported to u-boot:
	* Marek Szyprowski <m.szyprowski@samsung.com>
	* Lukasz Majewski <l.majewski@samsumg.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/
	#undef DEBUG
	#include <common.h>
	#include <asm/errno.h>
	#include <linux/list.h>
	#include <malloc.h>

	#include <linux/usb/ch9.h>
	#include <linux/usb/gadget.h>

	#include <asm/byteorder.h>
	#include <asm/unaligned.h>
	#include <asm/io.h>

	#include <asm/mach-types.h>

	#include "regs-otg.h"
	#include <usb/lin_gadget_compat.h>

	/***********************************************************/

	#define OTG_DMA_MODE 1

	#define DEBUG_SETUP 0
	#define DEBUG_EP0 0
	#define DEBUG_ISR 0
	#define DEBUG_OUT_EP 0
	#define DEBUG_IN_EP 0

	#include <usb/s3c_udc.h>

	#define EP0_CON 0
	#define EP_MASK 0xF

	static char *state_names[] = {
	"WAIT_FOR_SETUP",
	"DATA_STATE_XMIT",
	"DATA_STATE_NEED_ZLP",
	"WAIT_FOR_OUT_STATUS",
	"DATA_STATE_RECV",
	"WAIT_FOR_COMPLETE",
	"WAIT_FOR_OUT_COMPLETE",
	"WAIT_FOR_IN_COMPLETE",
	"WAIT_FOR_NULL_COMPLETE",
	};

	#define DRIVER_DESC "S3C HS USB OTG Device Driver, (c) Samsung Electronics"
	#define DRIVER_VERSION "15 March 2009"

	struct s3c_udc *the_controller;

	static const char driver_name[] = "s3c-udc";
	static const char driver_desc[] = DRIVER_DESC;
	static const char ep0name[] = "ep0-control";

	/* Max packet size*/
	static unsigned int ep0_fifo_size = 64;
	static unsigned int ep_fifo_size = 512;
	static unsigned int ep_fifo_size2 = 1024;
	static int reset_available = 1;

	static struct usb_ctrlrequest *usb_ctrl;
	static dma_addr_t usb_ctrl_dma_addr;

	/*
	Local declarations.
	*/
	static int s3c_ep_enable(struct usb_ep *ep,
	const struct usb_endpoint_descriptor *);
	static int s3c_ep_disable(struct usb_ep *ep);
	static struct usb_request s3c_alloc_request(struct usb_ep ep,
	gfp_t gfp_flags);
	static void s3c_free_request(struct usb_ep ep, struct usb_request );

	static int s3c_queue(struct usb_ep ep, struct usb_request , gfp_t gfp_flags);
	static int s3c_dequeue(struct usb_ep ep, struct usb_request );
	static int s3c_fifo_status(struct usb_ep *ep);
	static void s3c_fifo_flush(struct usb_ep *ep);
	static void s3c_ep0_read(struct s3c_udc *dev);
	static void s3c_ep0_kick(struct s3c_udc dev, struct s3c_ep ep);
	static void s3c_handle_ep0(struct s3c_udc *dev);
	static int s3c_ep0_write(struct s3c_udc *dev);
	static int write_fifo_ep0(struct s3c_ep ep, struct s3c_request req);
	static void done(struct s3c_ep ep, struct s3c_request req, int status);
	static void stop_activity(struct s3c_udc *dev,
	struct usb_gadget_driver *driver);
	static int udc_enable(struct s3c_udc *dev);
	static void udc_set_address(struct s3c_udc *dev, unsigned char address);
	static void reconfig_usbd(struct s3c_udc *dev);
	static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed);
	static void nuke(struct s3c_ep *ep, int status);
	static int s3c_udc_set_halt(struct usb_ep *_ep, int value);
	static void s3c_udc_set_nak(struct s3c_ep *ep);

	void set_udc_gadget_private_data(void *p)
	{
	debug_cond(DEBUG_SETUP != 0,
	"%s: the_controller: 0x%p, p: 0x%p\n", __func__,
	the_controller, p);
	the_controller->gadget.dev.device_data = p;
	}

	void get_udc_gadget_private_data(struct usb_gadget gadget)
	{
	return gadget->dev.device_data;
	}

	static struct usb_ep_ops s3c_ep_ops = {
	.enable = s3c_ep_enable,
	.disable = s3c_ep_disable,

	.alloc_request = s3c_alloc_request,
	.free_request = s3c_free_request,

	.queue = s3c_queue,
	.dequeue = s3c_dequeue,

	.set_halt = s3c_udc_set_halt,
	.fifo_status = s3c_fifo_status,
	.fifo_flush = s3c_fifo_flush,
	};

	#define create_proc_files() do {} while (0)
	#define remove_proc_files() do {} while (0)

	/***********************************************************/

	void __iomem *regs_otg;
	struct s3c_usbotg_reg *reg;

	bool dfu_usb_get_reset(void)
	{
	return !!(readl(&reg->gintsts) & INT_RESET);
	}

	__weak void otg_phy_init(struct s3c_udc *dev) {}
	__weak void otg_phy_off(struct s3c_udc *dev) {}

	/***********************************************************/

	#include "s3c_udc_otg_xfer_dma.c"

	/*
	* udc_disable - disable USB device controller
	*/
	static void udc_disable(struct s3c_udc *dev)
	{
	debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);

	udc_set_address(dev, 0);

	dev->ep0state = WAIT_FOR_SETUP;
	dev->gadget.speed = USB_SPEED_UNKNOWN;
	dev->usb_address = 0;

	otg_phy_off(dev);
	}

	/*
	* udc_reinit - initialize software state
	*/
	static void udc_reinit(struct s3c_udc *dev)
	{
	unsigned int i;

	debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);

	/* device/ep0 records init */
	INIT_LIST_HEAD(&dev->gadget.ep_list);
	INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
	dev->ep0state = WAIT_FOR_SETUP;

	/* basic endpoint records init */
	for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
	struct s3c_ep *ep = &dev->ep[i];

	if (i != 0)
	list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);

	ep->desc = 0;
	ep->stopped = 0;
	INIT_LIST_HEAD(&ep->queue);
	ep->pio_irqs = 0;
	}

	/* the rest was statically initialized, and is read-only */
	}

	#define BYTES2MAXP(x) (x / 8)
	#define MAXP2BYTES(x) (x * 8)

	/* until it's enabled, this UDC should be completely invisible
	* to any USB host.
	*/
	static int udc_enable(struct s3c_udc *dev)
	{
	debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);

	otg_phy_init(dev);
	reconfig_usbd(dev);

	debug_cond(DEBUG_SETUP != 0,
	"S3C USB 2.0 OTG Controller Core Initialized : 0x%x\n",
	readl(&reg->gintmsk));

	dev->gadget.speed = USB_SPEED_UNKNOWN;

	return 0;
	}

	/*
	Register entry point for the peripheral controller driver.
	*/
	int usb_gadget_register_driver(struct usb_gadget_driver *driver)
	{
	struct s3c_udc *dev = the_controller;
	int retval = 0;
	unsigned long flags = 0;

	debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");

	if (!driver
	\|\| (driver->speed != USB_SPEED_FULL
	&& driver->speed != USB_SPEED_HIGH)
	\|\| !driver->bind \|\| !driver->disconnect \|\| !driver->setup)
	return -EINVAL;
	if (!dev)
	return -ENODEV;
	if (dev->driver)
	return -EBUSY;

	spin_lock_irqsave(&dev->lock, flags);
	/* first hook up the driver ... */
	dev->driver = driver;
	spin_unlock_irqrestore(&dev->lock, flags);

	if (retval) { /* TODO */
	printf("target device_add failed, error %d\n", retval);
	return retval;
	}

	retval = driver->bind(&dev->gadget);
	if (retval) {
	debug_cond(DEBUG_SETUP != 0,
	"%s: bind to driver --> error %d\n",
	dev->gadget.name, retval);
	dev->driver = 0;
	return retval;
	}

	enable_irq(IRQ_OTG);

	debug_cond(DEBUG_SETUP != 0,
	"Registered gadget driver %s\n", dev->gadget.name);
	udc_enable(dev);

	return 0;
	}

	/*
	* Unregister entry point for the peripheral controller driver.
	*/
	int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
	{
	struct s3c_udc *dev = the_controller;
	unsigned long flags = 0;

	if (!dev)
	return -ENODEV;
	if (!driver \|\| driver != dev->driver)
	return -EINVAL;

	spin_lock_irqsave(&dev->lock, flags);
	dev->driver = 0;
	stop_activity(dev, driver);
	spin_unlock_irqrestore(&dev->lock, flags);

	driver->unbind(&dev->gadget);

	disable_irq(IRQ_OTG);

	udc_disable(dev);
	return 0;
	}

	/*
	* done - retire a request; caller blocked irqs
	*/
	static void done(struct s3c_ep ep, struct s3c_request req, int status)
	{
	unsigned int stopped = ep->stopped;

	debug("%s: %s %p, req = %p, stopped = %d\n",
	__func__, ep->ep.name, ep, &req->req, stopped);

	list_del_init(&req->queue);

	if (likely(req->req.status == -EINPROGRESS))
	req->req.status = status;
	else
	status = req->req.status;

	if (status && status != -ESHUTDOWN) {
	debug("complete %s req %p stat %d len %u/%u\n",
	ep->ep.name, &req->req, status,
	req->req.actual, req->req.length);
	}

	/* don't modify queue heads during completion callback */
	ep->stopped = 1;

	#ifdef DEBUG
	printf("calling complete callback\n");
	{
	int i, len = req->req.length;

	printf("pkt[%d] = ", req->req.length);
	if (len > 64)
	len = 64;
	for (i = 0; i < len; i++) {
	printf("%02x", ((u8 *)req->req.buf)[i]);
	if ((i & 7) == 7)
	printf(" ");
	}
	printf("\n");
	}
	#endif
	spin_unlock(&ep->dev->lock);
	req->req.complete(&ep->ep, &req->req);
	spin_lock(&ep->dev->lock);

	debug("callback completed\n");

	ep->stopped = stopped;
	}

	/*
	* nuke - dequeue ALL requests
	*/
	static void nuke(struct s3c_ep *ep, int status)
	{
	struct s3c_request *req;

	debug("%s: %s %p\n", __func__, ep->ep.name, ep);

	/* called with irqs blocked */
	while (!list_empty(&ep->queue)) {
	req = list_entry(ep->queue.next, struct s3c_request, queue);
	done(ep, req, status);
	}
	}

	static void stop_activity(struct s3c_udc *dev,
	struct usb_gadget_driver *driver)
	{
	int i;

	/* don't disconnect drivers more than once */
	if (dev->gadget.speed == USB_SPEED_UNKNOWN)
	driver = 0;
	dev->gadget.speed = USB_SPEED_UNKNOWN;

	/* prevent new request submissions, kill any outstanding requests */
	for (i = 0; i < S3C_MAX_ENDPOINTS; i++) {
	struct s3c_ep *ep = &dev->ep[i];
	ep->stopped = 1;
	nuke(ep, -ESHUTDOWN);
	}

	/* report disconnect; the driver is already quiesced */
	if (driver) {
	spin_unlock(&dev->lock);
	driver->disconnect(&dev->gadget);
	spin_lock(&dev->lock);
	}

	/* re-init driver-visible data structures */
	udc_reinit(dev);
	}

	static void reconfig_usbd(struct s3c_udc *dev)
	{
	/* 2. Soft-reset OTG Core and then unreset again. */
	int i;
	unsigned int uTemp = writel(CORE_SOFT_RESET, &reg->grstctl);
	uint32_t dflt_gusbcfg;

	debug("Reseting OTG controller\n");

	dflt_gusbcfg =
	0<<15 /* PHY Low Power Clock sel*/
	\|1<<14 /* Non-Periodic TxFIFO Rewind Enable*/
	\|0x5<<10 /* Turnaround time*/
	\|0<<9 \| 0<<8 /* [0:HNP disable,1:HNP enable][ 0:SRP disable*/
	/* 1:SRP enable] H1= 1,1*/
	\|0<<7 /* Ulpi DDR sel*/
	\|0<<6 /* 0: high speed utmi+, 1: full speed serial*/
	\|0<<4 /* 0: utmi+, 1:ulpi*/
	\|1<<3 /* phy i/f 0:8bit, 1:16bit*/
	\|0x7<<0; /* HS/FS Timeout**/

	if (dev->pdata->usb_gusbcfg)
	dflt_gusbcfg = dev->pdata->usb_gusbcfg;

	writel(dflt_gusbcfg, &reg->gusbcfg);

	/* 3. Put the OTG device core in the disconnected state.*/
	uTemp = readl(&reg->dctl);
	uTemp \|= SOFT_DISCONNECT;
	writel(uTemp, &reg->dctl);

	udelay(20);

	/* 4. Make the OTG device core exit from the disconnected state.*/
	uTemp = readl(&reg->dctl);
	uTemp = uTemp & ~SOFT_DISCONNECT;
	writel(uTemp, &reg->dctl);

	/* 5. Configure OTG Core to initial settings of device mode.*/
	/* [][1: full speed(30Mhz) 0:high speed]*/
	writel(EP_MISS_CNT(1) \| DEV_SPEED_HIGH_SPEED_20, &reg->dcfg);

	mdelay(1);

	/* 6. Unmask the core interrupts*/
	writel(GINTMSK_INIT, &reg->gintmsk);

	/* 7. Set NAK bit of EP0, EP1, EP2*/
	writel(DEPCTL_EPDIS\|DEPCTL_SNAK, &reg->out_endp[EP0_CON].doepctl);
	writel(DEPCTL_EPDIS\|DEPCTL_SNAK, &reg->in_endp[EP0_CON].diepctl);

	for (i = 1; i < S3C_MAX_ENDPOINTS; i++) {
	writel(DEPCTL_EPDIS\|DEPCTL_SNAK, &reg->out_endp[i].doepctl);
	writel(DEPCTL_EPDIS\|DEPCTL_SNAK, &reg->in_endp[i].diepctl);
	}

	/* 8. Unmask EPO interrupts*/
	writel(((1 << EP0_CON) << DAINT_OUT_BIT)
	\| (1 << EP0_CON), &reg->daintmsk);

	/* 9. Unmask device OUT EP common interrupts*/
	writel(DOEPMSK_INIT, &reg->doepmsk);

	/* 10. Unmask device IN EP common interrupts*/
	writel(DIEPMSK_INIT, &reg->diepmsk);

	/* 11. Set Rx FIFO Size (in 32-bit words) */
	writel(RX_FIFO_SIZE >> 2, &reg->grxfsiz);

	/* 12. Set Non Periodic Tx FIFO Size */
	writel((NPTX_FIFO_SIZE >> 2) << 16 \| ((RX_FIFO_SIZE >> 2)) << 0,
	&reg->gnptxfsiz);

	for (i = 1; i < S3C_MAX_HW_ENDPOINTS; i++)
	writel((PTX_FIFO_SIZE >> 2) << 16 \|
	((RX_FIFO_SIZE + NPTX_FIFO_SIZE +
	PTX_FIFO_SIZE*(i-1)) >> 2) << 0,
	&reg->dieptxf[i-1]);

	/* Flush the RX FIFO */
	writel(RX_FIFO_FLUSH, &reg->grstctl);
	while (readl(&reg->grstctl) & RX_FIFO_FLUSH)
	debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);

	/* Flush all the Tx FIFO's */
	writel(TX_FIFO_FLUSH_ALL, &reg->grstctl);
	writel(TX_FIFO_FLUSH_ALL \| TX_FIFO_FLUSH, &reg->grstctl);
	while (readl(&reg->grstctl) & TX_FIFO_FLUSH)
	debug("%s: waiting for S3C_UDC_OTG_GRSTCTL\n", __func__);

	/* 13. Clear NAK bit of EP0, EP1, EP2*/
	/* For Slave mode*/
	/* EP0: Control OUT */
	writel(DEPCTL_EPDIS \| DEPCTL_CNAK,
	&reg->out_endp[EP0_CON].doepctl);

	/* 14. Initialize OTG Link Core.*/
	writel(GAHBCFG_INIT, &reg->gahbcfg);
	}

	static void set_max_pktsize(struct s3c_udc *dev, enum usb_device_speed speed)
	{
	unsigned int ep_ctrl;
	int i;

	if (speed == USB_SPEED_HIGH) {
	ep0_fifo_size = 64;
	ep_fifo_size = 512;
	ep_fifo_size2 = 1024;
	dev->gadget.speed = USB_SPEED_HIGH;
	} else {
	ep0_fifo_size = 64;
	ep_fifo_size = 64;
	ep_fifo_size2 = 64;
	dev->gadget.speed = USB_SPEED_FULL;
	}

	dev->ep[0].ep.maxpacket = ep0_fifo_size;
	for (i = 1; i < S3C_MAX_ENDPOINTS; i++)
	dev->ep[i].ep.maxpacket = ep_fifo_size;

	/* EP0 - Control IN (64 bytes)*/
	ep_ctrl = readl(&reg->in_endp[EP0_CON].diepctl);
	writel(ep_ctrl\|(0<<0), &reg->in_endp[EP0_CON].diepctl);

	/* EP0 - Control OUT (64 bytes)*/
	ep_ctrl = readl(&reg->out_endp[EP0_CON].doepctl);
	writel(ep_ctrl\|(0<<0), &reg->out_endp[EP0_CON].doepctl);
	}

	static int s3c_ep_enable(struct usb_ep *_ep,
	const struct usb_endpoint_descriptor *desc)
	{
	struct s3c_ep *ep;
	struct s3c_udc *dev;
	unsigned long flags = 0;

	debug("%s: %p\n", __func__, _ep);

	ep = container_of(_ep, struct s3c_ep, ep);
	if (!_ep \|\| !desc \|\| ep->desc \|\| _ep->name == ep0name
	\|\| desc->bDescriptorType != USB_DT_ENDPOINT
	\|\| ep->bEndpointAddress != desc->bEndpointAddress
	\|\| ep_maxpacket(ep) <
	le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {

	debug("%s: bad ep or descriptor\n", __func__);
	return -EINVAL;
	}

	/* xfer types must match, except that interrupt ~= bulk */
	if (ep->bmAttributes != desc->bmAttributes
	&& ep->bmAttributes != USB_ENDPOINT_XFER_BULK
	&& desc->bmAttributes != USB_ENDPOINT_XFER_INT) {

	debug("%s: %s type mismatch\n", __func__, _ep->name);
	return -EINVAL;
	}

	/* hardware _could_ do smaller, but driver doesn't */
	if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
	&& le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) !=
	ep_maxpacket(ep)) \|\| !get_unaligned(&desc->wMaxPacketSize)) {

	debug("%s: bad %s maxpacket\n", __func__, _ep->name);
	return -ERANGE;
	}

	dev = ep->dev;
	if (!dev->driver \|\| dev->gadget.speed == USB_SPEED_UNKNOWN) {

	debug("%s: bogus device state\n", __func__);
	return -ESHUTDOWN;
	}

	ep->stopped = 0;
	ep->desc = desc;
	ep->pio_irqs = 0;
	ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));

	/* Reset halt state */
	s3c_udc_set_nak(ep);
	s3c_udc_set_halt(_ep, 0);

	spin_lock_irqsave(&ep->dev->lock, flags);
	s3c_udc_ep_activate(ep);
	spin_unlock_irqrestore(&ep->dev->lock, flags);

	debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
	__func__, _ep->name, ep->stopped, ep->ep.maxpacket);
	return 0;
	}

	/*
	* Disable EP
	*/
	static int s3c_ep_disable(struct usb_ep *_ep)
	{
	struct s3c_ep *ep;
	unsigned long flags = 0;

	debug("%s: %p\n", __func__, _ep);

	ep = container_of(_ep, struct s3c_ep, ep);
	if (!_ep \|\| !ep->desc) {
	debug("%s: %s not enabled\n", __func__,
	_ep ? ep->ep.name : NULL);
	return -EINVAL;
	}

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

	/* Nuke all pending requests */
	nuke(ep, -ESHUTDOWN);

	ep->desc = 0;
	ep->stopped = 1;

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

	debug("%s: disabled %s\n", __func__, _ep->name);
	return 0;
	}

	static struct usb_request s3c_alloc_request(struct usb_ep ep,
	gfp_t gfp_flags)
	{
	struct s3c_request *req;

	debug("%s: %s %p\n", __func__, ep->name, ep);

	req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
	if (!req)
	return 0;

	memset(req, 0, sizeof *req);
	INIT_LIST_HEAD(&req->queue);

	return &req->req;
	}

	static void s3c_free_request(struct usb_ep ep, struct usb_request _req)
	{
	struct s3c_request *req;

	debug("%s: %p\n", __func__, ep);

	req = container_of(_req, struct s3c_request, req);
	WARN_ON(!list_empty(&req->queue));
	kfree(req);
	}

	/* dequeue JUST ONE request */
	static int s3c_dequeue(struct usb_ep _ep, struct usb_request _req)
	{
	struct s3c_ep *ep;
	struct s3c_request *req;
	unsigned long flags = 0;

	debug("%s: %p\n", __func__, _ep);

	ep = container_of(_ep, struct s3c_ep, ep);
	if (!_ep \|\| ep->ep.name == ep0name)
	return -EINVAL;

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

	/* make sure it's actually queued on this endpoint */
	list_for_each_entry(req, &ep->queue, queue) {
	if (&req->req == _req)
	break;
	}
	if (&req->req != _req) {
	spin_unlock_irqrestore(&ep->dev->lock, flags);
	return -EINVAL;
	}

	done(ep, req, -ECONNRESET);

	spin_unlock_irqrestore(&ep->dev->lock, flags);
	return 0;
	}

	/*
	* Return bytes in EP FIFO
	*/
	static int s3c_fifo_status(struct usb_ep *_ep)
	{
	int count = 0;
	struct s3c_ep *ep;

	ep = container_of(_ep, struct s3c_ep, ep);
	if (!_ep) {
	debug("%s: bad ep\n", __func__);
	return -ENODEV;
	}

	debug("%s: %d\n", __func__, ep_index(ep));

	/* LPD can't report unclaimed bytes from IN fifos */
	if (ep_is_in(ep))
	return -EOPNOTSUPP;

	return count;
	}

	/*
	* Flush EP FIFO
	*/
	static void s3c_fifo_flush(struct usb_ep *_ep)
	{
	struct s3c_ep *ep;

	ep = container_of(_ep, struct s3c_ep, ep);
	if (unlikely(!_ep \|\| (!ep->desc && ep->ep.name != ep0name))) {
	debug("%s: bad ep\n", __func__);
	return;
	}

	debug("%s: %d\n", __func__, ep_index(ep));
	}

	static const struct usb_gadget_ops s3c_udc_ops = {
	/* current versions must always be self-powered */
	};

	static struct s3c_udc memory = {
	.usb_address = 0,
	.gadget = {
	.ops = &s3c_udc_ops,
	.ep0 = &memory.ep[0].ep,
	.name = driver_name,
	},

	/* control endpoint */
	.ep[0] = {
	.ep = {
	.name = ep0name,
	.ops = &s3c_ep_ops,
	.maxpacket = EP0_FIFO_SIZE,
	},
	.dev = &memory,

	.bEndpointAddress = 0,
	.bmAttributes = 0,

	.ep_type = ep_control,
	},

	/* first group of endpoints */
	.ep[1] = {
	.ep = {
	.name = "ep1in-bulk",
	.ops = &s3c_ep_ops,
	.maxpacket = EP_FIFO_SIZE,
	},
	.dev = &memory,

	.bEndpointAddress = USB_DIR_IN \| 1,
	.bmAttributes = USB_ENDPOINT_XFER_BULK,

	.ep_type = ep_bulk_out,
	.fifo_num = 1,
	},

	.ep[2] = {
	.ep = {
	.name = "ep2out-bulk",
	.ops = &s3c_ep_ops,
	.maxpacket = EP_FIFO_SIZE,
	},
	.dev = &memory,

	.bEndpointAddress = USB_DIR_OUT \| 2,
	.bmAttributes = USB_ENDPOINT_XFER_BULK,

	.ep_type = ep_bulk_in,
	.fifo_num = 2,
	},

	.ep[3] = {
	.ep = {
	.name = "ep3in-int",
	.ops = &s3c_ep_ops,
	.maxpacket = EP_FIFO_SIZE,
	},
	.dev = &memory,

	.bEndpointAddress = USB_DIR_IN \| 3,
	.bmAttributes = USB_ENDPOINT_XFER_INT,

	.ep_type = ep_interrupt,
	.fifo_num = 3,
	},
	};

	/*
	* probe - binds to the platform device
	*/

	int s3c_udc_probe(struct s3c_plat_otg_data *pdata)
	{
	struct s3c_udc *dev = &memory;
	int retval = 0;

	debug("%s: %p\n", __func__, pdata);

	dev->pdata = pdata;

	reg = (struct s3c_usbotg_reg *)pdata->regs_otg;

	/* regs_otg = (void )pdata->regs_otg; /

	dev->gadget.is_dualspeed = 1; /* Hack only*/
	dev->gadget.is_otg = 0;
	dev->gadget.is_a_peripheral = 0;
	dev->gadget.b_hnp_enable = 0;
	dev->gadget.a_hnp_support = 0;
	dev->gadget.a_alt_hnp_support = 0;

	the_controller = dev;

	usb_ctrl = memalign(CONFIG_SYS_CACHELINE_SIZE,
	ROUND(sizeof(struct usb_ctrlrequest),
	CONFIG_SYS_CACHELINE_SIZE));
	if (!usb_ctrl) {
	error("No memory available for UDC!\n");
	return -ENOMEM;
	}

	usb_ctrl_dma_addr = (dma_addr_t) usb_ctrl;

	udc_reinit(dev);

	return retval;
	}

	int usb_gadget_handle_interrupts()
	{
	u32 intr_status = readl(&reg->gintsts);
	u32 gintmsk = readl(&reg->gintmsk);

	if (intr_status & gintmsk)
	return s3c_udc_irq(1, (void *)the_controller);
	return 0;
	}