usb:gadget:s5p USB Device Controller (UDC) implementation

This commit provides UDC driver support for Samsung's SoC
family of processors.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Remy Bohmer <linux@bohmer.net>

1 files changed, 892 insertions, 0 deletions

diff --git a/drivers/usb/gadget/s3c_udc_otg.c b/drivers/usb/gadget/s3c_udc_otg.c
new file mode 100644
index 0000000000..5a3ac78ff2
--- /dev/null
+++ b/drivers/usb/gadget/s3c_udc_otg.c
@@ -0,0 +1,892 @@
+/*
+ * 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>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#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/io.h>
+
+#include <asm/mach-types.h>
+#include <asm/arch/gpio.h>
+
+#include "regs-otg.h"
+#include <usb/s3c_udc.h>
+#include <usb/lin_gadget_compat.h>
+
+/***********************************************************/
+
+#define OTG_DMA_MODE		1
+
+#undef DEBUG_S3C_UDC_SETUP
+#undef DEBUG_S3C_UDC_EP0
+#undef DEBUG_S3C_UDC_ISR
+#undef DEBUG_S3C_UDC_OUT_EP
+#undef DEBUG_S3C_UDC_IN_EP
+#undef DEBUG_S3C_UDC
+
+/* #define DEBUG_S3C_UDC_SETUP */
+/* #define DEBUG_S3C_UDC_EP0 */
+/* #define DEBUG_S3C_UDC_ISR */
+/* #define DEBUG_S3C_UDC_OUT_EP */
+/* #define DEBUG_S3C_UDC_IN_EP */
+/* #define DEBUG_S3C_UDC */
+
+#include <usb/s3c_udc.h>
+
+#define EP0_CON		0
+#define EP_MASK		0xF
+
+#if defined(DEBUG_S3C_UDC_SETUP) || defined(DEBUG_S3C_UDC_ISR)	  \
+	|| defined(DEBUG_S3C_UDC_OUT_EP)
+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",
+};
+#endif
+
+#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(void);
+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);
+
+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;
+struct s3c_usbotg_phy *phy;
+static unsigned int usb_phy_ctrl;
+
+void otg_phy_init(struct s3c_udc *dev)
+{
+	dev->pdata->phy_control(1);
+
+	/*USB PHY0 Enable */
+	printf("USB PHY0 Enable\n");
+
+	/* Enable PHY */
+	writel(readl(usb_phy_ctrl) | USB_PHY_CTRL_EN0, usb_phy_ctrl);
+
+	if (dev->pdata->usb_flags == PHY0_SLEEP) /* C210 Universal */
+		writel((readl(&phy->phypwr)
+			&~(PHY_0_SLEEP | OTG_DISABLE_0 | ANALOG_PWRDOWN)
+			&~FORCE_SUSPEND_0), &phy->phypwr);
+	else /* C110 GONI */
+		writel((readl(&phy->phypwr) &~(OTG_DISABLE_0 | ANALOG_PWRDOWN)
+			&~FORCE_SUSPEND_0), &phy->phypwr);
+
+	writel((readl(&phy->phyclk) &~(ID_PULLUP0 | COMMON_ON_N0)) |
+	       CLK_SEL_24MHZ, &phy->phyclk); /* PLL 24Mhz */
+
+	writel((readl(&phy->rstcon) &~(LINK_SW_RST | PHYLNK_SW_RST))
+	       | PHY_SW_RST0, &phy->rstcon);
+	udelay(10);
+	writel(readl(&phy->rstcon)
+	       &~(PHY_SW_RST0 | LINK_SW_RST | PHYLNK_SW_RST), &phy->rstcon);
+	udelay(10);
+}
+
+void otg_phy_off(struct s3c_udc *dev)
+{
+	/* reset controller just in case */
+	writel(PHY_SW_RST0, &phy->rstcon);
+	udelay(20);
+	writel(readl(&phy->phypwr) &~PHY_SW_RST0, &phy->rstcon);
+	udelay(20);
+
+	writel(readl(&phy->phypwr) | OTG_DISABLE_0 | ANALOG_PWRDOWN
+	       | FORCE_SUSPEND_0, &phy->phypwr);
+
+	writel(readl(usb_phy_ctrl) &~USB_PHY_CTRL_EN0, usb_phy_ctrl);
+
+	writel((readl(&phy->phyclk) & ~(ID_PULLUP0 | COMMON_ON_N0)),
+	      &phy->phyclk);
+
+	udelay(10000);
+
+	dev->pdata->phy_control(0);
+}
+
+/***********************************************************/
+
+#include "s3c_udc_otg_xfer_dma.c"
+
+/*
+ *	udc_disable - disable USB device controller
+ */
+static void udc_disable(struct s3c_udc *dev)
+{
+	DEBUG_SETUP("%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_SETUP("%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_SETUP("%s: %p\n", __func__, dev);
+
+	otg_phy_init(dev);
+	reconfig_usbd();
+
+	DEBUG_SETUP("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;
+
+	DEBUG_SETUP("%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_SETUP("%s: bind to driver --> error %d\n",
+			    dev->gadget.name, retval);
+		dev->driver = 0;
+		return retval;
+	}
+
+	enable_irq(IRQ_OTG);
+
+	DEBUG_SETUP("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;
+
+	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_S3C_UDC
+	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(void)
+{
+	/* 2. Soft-reset OTG Core and then unreset again. */
+	int i;
+	unsigned int uTemp = writel(CORE_SOFT_RESET, &reg->grstctl);
+
+	DEBUG(2, "Reseting OTG controller\n");
+
+	writel(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**/
+		&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;
+
+	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(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(desc->wMaxPacketSize) != ep_maxpacket(ep))
+	    || !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(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;
+
+	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 = kmalloc(sizeof *req, gfp_flags);
+	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;
+
+	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, i;
+
+	DEBUG("%s: %p\n", __func__, pdata);
+
+	dev->pdata = pdata;
+
+	phy = (struct s3c_usbotg_phy *)pdata->regs_phy;
+	reg = (struct s3c_usbotg_reg *)pdata->regs_otg;
+	usb_phy_ctrl = pdata->usb_phy_ctrl;
+
+	/* 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;
+
+	for (i = 0; i < S3C_MAX_ENDPOINTS+1; i++) {
+		dev->dma_buf[i] = kmalloc(DMA_BUFFER_SIZE, GFP_KERNEL);
+		dev->dma_addr[i] = (dma_addr_t) dev->dma_buf[i];
+		invalidate_dcache_range((unsigned long) dev->dma_buf[i],
+					(unsigned long) (dev->dma_buf[i]
+							 + DMA_BUFFER_SIZE));
+	}
+	usb_ctrl = dev->dma_buf[0];
+	usb_ctrl_dma_addr = dev->dma_addr[0];
+
+	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;
+}