USB Gadget driver for Samsung s3c2410 ARM SoC

This patch adds the support for the Usb Device Controller on Samsung
S3C24xx SoCs.  This driver passes all tests from testusb (including #13)
and has been tested on S3C2410, S3C24212, and S3C2440 SoCs.

Whitespace updates, minor cleanups by David
Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Cc: Herbert Pötzl <herbert@13thfloor.at>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/Kconfig

@@ -208,6 +208,27 @@ config USB_OTG
 
 	   Select this only if your OMAP board has a Mini-AB connector.
 
+config USB_GADGET_S3C2410
+	boolean "S3C2410 USB Device Controller"
+	depends on ARCH_S3C2410
+	help
+	  Samsung's S3C2410 is an ARM-4 processor with an integrated
+	  full speed USB 1.1 device controller.  It has 4 configurable
+	  endpoints, as well as endpoint zero (for control transfers).
+
+	  This driver has been tested on the S3C2410, S3C2412, and
+	  S3C2440 processors.
+
+config USB_S3C2410
+	tristate
+	depends on USB_GADGET_S3C2410
+	default USB_GADGET
+	select USB_GADGET_SELECTED
+
+config USB_S3C2410_DEBUG
+	boolean "S3C2410 udc debug messages"
+	depends on USB_GADGET_S3C2410
+
 config USB_GADGET_AT91
 	boolean "AT91 USB Device Port"
 	depends on ARCH_AT91 && !ARCH_AT91SAM9RL

drivers/usb/gadget/Makefile

@@ -7,6 +7,7 @@ obj-$(CONFIG_USB_PXA2XX)	+= pxa2xx_udc.o
 obj-$(CONFIG_USB_GOKU)		+= goku_udc.o
 obj-$(CONFIG_USB_OMAP)		+= omap_udc.o
 obj-$(CONFIG_USB_LH7A40X)	+= lh7a40x_udc.o
+obj-$(CONFIG_USB_S3C2410)	+= s3c2410_udc.o
 obj-$(CONFIG_USB_AT91)		+= at91_udc.o
 obj-$(CONFIG_USB_FSL_USB2)	+= fsl_usb2_udc.o
 obj-$(CONFIG_USB_M66592)	+= m66592-udc.o

drivers/usb/gadget/s3c2410_udc.c

+/*
+ * linux/drivers/usb/gadget/s3c2410_udc.c
+ *
+ * Samsung S3C24xx series on-chip full speed USB device controllers
+ *
+ * Copyright (C) 2004-2007 Herbert Ptzl - Arnaud Patard
+ *	Additional cleanups by Ben Dooks <ben-linux@fluff.org>
+ *
+ * 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 <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/version.h>
+#include <linux/clk.h>
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include <linux/usb.h>
+#include <linux/usb_gadget.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+#include <asm/arch/irqs.h>
+
+#include <asm/arch/hardware.h>
+#include <asm/arch/regs-clock.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/regs-udc.h>
+#include <asm/arch/udc.h>
+
+#include <asm/mach-types.h>
+
+#include "s3c2410_udc.h"
+
+#define DRIVER_DESC	"S3C2410 USB Device Controller Gadget"
+#define DRIVER_VERSION	"29 Apr 2007"
+#define DRIVER_AUTHOR	"Herbert Ptzl <herbert@13thfloor.at>, " \
+			"Arnaud Patard <arnaud.patard@rtp-net.org>"
+
+static const char		gadget_name[] = "s3c2410_udc";
+static const char		driver_desc[] = DRIVER_DESC;
+
+static struct s3c2410_udc	*the_controller;
+static struct clk		*udc_clock;
+static struct clk		*usb_bus_clock;
+static void __iomem		*base_addr;
+static u64			rsrc_start;
+static u64			rsrc_len;
+static struct dentry		*s3c2410_udc_debugfs_root;
+
+static inline u32 udc_read(u32 reg)
+{
+	return readb(base_addr + reg);
+}
+
+static inline void udc_write(u32 value, u32 reg)
+{
+	writeb(value, base_addr + reg);
+}
+
+static inline void udc_writeb(void __iomem *base, u32 value, u32 reg)
+{
+	writeb(value, base + reg);
+}
+
+static struct s3c2410_udc_mach_info *udc_info;
+
+/*************************** DEBUG FUNCTION ***************************/
+#define DEBUG_NORMAL	1
+#define DEBUG_VERBOSE	2
+
+#ifdef CONFIG_USB_S3C2410_DEBUG
+#define USB_S3C2410_DEBUG_LEVEL 0
+
+static uint32_t s3c2410_ticks = 0;
+
+static int dprintk(int level, const char *fmt, ...)
+{
+	static char printk_buf[1024];
+	static long prevticks;
+	static int invocation;
+	va_list args;
+	int len;
+
+	if (level > USB_S3C2410_DEBUG_LEVEL)
+		return 0;
+
+	if (s3c2410_ticks != prevticks) {
+		prevticks = s3c2410_ticks;
+		invocation = 0;
+	}
+
+	len = scnprintf(printk_buf,
+			sizeof(printk_buf), "%1lu.%02d USB: ",
+			prevticks, invocation++);
+
+	va_start(args, fmt);
+	len = vscnprintf(printk_buf+len,
+			sizeof(printk_buf)-len, fmt, args);
+	va_end(args);
+
+	return printk(KERN_DEBUG "%s", printk_buf);
+}
+#else
+static int dprintk(int level, const char *fmt, ...)
+{
+	return 0;
+}
+#endif
+static int s3c2410_udc_debugfs_seq_show(struct seq_file *m, void *p)
+{
+	u32 addr_reg,pwr_reg,ep_int_reg,usb_int_reg;
+	u32 ep_int_en_reg, usb_int_en_reg, ep0_csr;
+	u32 ep1_i_csr1,ep1_i_csr2,ep1_o_csr1,ep1_o_csr2;
+	u32 ep2_i_csr1,ep2_i_csr2,ep2_o_csr1,ep2_o_csr2;
+
+	addr_reg       = udc_read(S3C2410_UDC_FUNC_ADDR_REG);
+	pwr_reg        = udc_read(S3C2410_UDC_PWR_REG);
+	ep_int_reg     = udc_read(S3C2410_UDC_EP_INT_REG);
+	usb_int_reg    = udc_read(S3C2410_UDC_USB_INT_REG);
+	ep_int_en_reg  = udc_read(S3C2410_UDC_EP_INT_EN_REG);
+	usb_int_en_reg = udc_read(S3C2410_UDC_USB_INT_EN_REG);
+	udc_write(0, S3C2410_UDC_INDEX_REG);
+	ep0_csr        = udc_read(S3C2410_UDC_IN_CSR1_REG);
+	udc_write(1, S3C2410_UDC_INDEX_REG);
+	ep1_i_csr1     = udc_read(S3C2410_UDC_IN_CSR1_REG);
+	ep1_i_csr2     = udc_read(S3C2410_UDC_IN_CSR2_REG);
+	ep1_o_csr1     = udc_read(S3C2410_UDC_IN_CSR1_REG);
+	ep1_o_csr2     = udc_read(S3C2410_UDC_IN_CSR2_REG);
+	udc_write(2, S3C2410_UDC_INDEX_REG);
+	ep2_i_csr1     = udc_read(S3C2410_UDC_IN_CSR1_REG);
+	ep2_i_csr2     = udc_read(S3C2410_UDC_IN_CSR2_REG);
+	ep2_o_csr1     = udc_read(S3C2410_UDC_IN_CSR1_REG);
+	ep2_o_csr2     = udc_read(S3C2410_UDC_IN_CSR2_REG);
+
+	seq_printf(m, "FUNC_ADDR_REG  : 0x%04X\n"
+		 "PWR_REG        : 0x%04X\n"
+		 "EP_INT_REG     : 0x%04X\n"
+		 "USB_INT_REG    : 0x%04X\n"
+		 "EP_INT_EN_REG  : 0x%04X\n"
+		 "USB_INT_EN_REG : 0x%04X\n"
+		 "EP0_CSR        : 0x%04X\n"
+		 "EP1_I_CSR1     : 0x%04X\n"
+		 "EP1_I_CSR2     : 0x%04X\n"
+		 "EP1_O_CSR1     : 0x%04X\n"
+		 "EP1_O_CSR2     : 0x%04X\n"
+		 "EP2_I_CSR1     : 0x%04X\n"
+		 "EP2_I_CSR2     : 0x%04X\n"
+		 "EP2_O_CSR1     : 0x%04X\n"
+		 "EP2_O_CSR2     : 0x%04X\n",
+			addr_reg,pwr_reg,ep_int_reg,usb_int_reg,
+			ep_int_en_reg, usb_int_en_reg, ep0_csr,
+			ep1_i_csr1,ep1_i_csr2,ep1_o_csr1,ep1_o_csr2,
+			ep2_i_csr1,ep2_i_csr2,ep2_o_csr1,ep2_o_csr2
+		);
+
+	return 0;
+}
+
+static int s3c2410_udc_debugfs_fops_open(struct inode *inode,
+					 struct file *file)
+{
+	return single_open(file, s3c2410_udc_debugfs_seq_show, NULL);
+}
+
+static const struct file_operations s3c2410_udc_debugfs_fops = {
+	.open		= s3c2410_udc_debugfs_fops_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+	.owner		= THIS_MODULE,
+};
+
+/* io macros */
+
+static inline void s3c2410_udc_clear_ep0_opr(void __iomem *base)
+{
+	udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+	udc_writeb(base, S3C2410_UDC_EP0_CSR_SOPKTRDY,
+			S3C2410_UDC_EP0_CSR_REG);
+}
+
+static inline void s3c2410_udc_clear_ep0_sst(void __iomem *base)
+{
+	udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+	writeb(0x00, base + S3C2410_UDC_EP0_CSR_REG);
+}
+
+static inline void s3c2410_udc_clear_ep0_se(void __iomem *base)
+{
+	udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+	udc_writeb(base, S3C2410_UDC_EP0_CSR_SSE, S3C2410_UDC_EP0_CSR_REG);
+}
+
+static inline void s3c2410_udc_set_ep0_ipr(void __iomem *base)
+{
+	udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+	udc_writeb(base, S3C2410_UDC_EP0_CSR_IPKRDY, S3C2410_UDC_EP0_CSR_REG);
+}
+
+static inline void s3c2410_udc_set_ep0_de(void __iomem *base)
+{
+	udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+	udc_writeb(base, S3C2410_UDC_EP0_CSR_DE, S3C2410_UDC_EP0_CSR_REG);
+}
+
+inline void s3c2410_udc_set_ep0_ss(void __iomem *b)
+{
+	udc_writeb(b, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+	udc_writeb(b, S3C2410_UDC_EP0_CSR_SENDSTL, S3C2410_UDC_EP0_CSR_REG);
+}
+
+static inline void s3c2410_udc_set_ep0_de_out(void __iomem *base)
+{
+	udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+
+	udc_writeb(base,(S3C2410_UDC_EP0_CSR_SOPKTRDY
+				| S3C2410_UDC_EP0_CSR_DE),
+			S3C2410_UDC_EP0_CSR_REG);
+}
+
+static inline void s3c2410_udc_set_ep0_sse_out(void __iomem *base)
+{
+	udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+	udc_writeb(base, (S3C2410_UDC_EP0_CSR_SOPKTRDY
+				| S3C2410_UDC_EP0_CSR_SSE),
+			S3C2410_UDC_EP0_CSR_REG);
+}
+
+static inline void s3c2410_udc_set_ep0_de_in(void __iomem *base)
+{
+	udc_writeb(base, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+	udc_writeb(base, (S3C2410_UDC_EP0_CSR_IPKRDY
+			| S3C2410_UDC_EP0_CSR_DE),
+		S3C2410_UDC_EP0_CSR_REG);
+}
+
+/*------------------------- I/O ----------------------------------*/
+
+/*
+ *	s3c2410_udc_done
+ */
+static void s3c2410_udc_done(struct s3c2410_ep *ep,
+		struct s3c2410_request *req, int status)
+{
+	unsigned halted = ep->halted;
+
+	list_del_init(&req->queue);
+
+	if (likely (req->req.status == -EINPROGRESS))
+		req->req.status = status;
+	else
+		status = req->req.status;
+
+	ep->halted = 1;
+	req->req.complete(&ep->ep, &req->req);
+	ep->halted = halted;
+}
+
+static void s3c2410_udc_nuke(struct s3c2410_udc *udc,
+		struct s3c2410_ep *ep, int status)
+{
+	/* Sanity check */
+	if (&ep->queue == NULL)
+		return;
+
+	while (!list_empty (&ep->queue)) {
+		struct s3c2410_request *req;
+		req = list_entry (ep->queue.next, struct s3c2410_request,
+				queue);
+		s3c2410_udc_done(ep, req, status);
+	}
+}
+
+static inline void s3c2410_udc_clear_ep_state(struct s3c2410_udc *dev)
+{
+	unsigned i;
+
+	/* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
+	 * fifos, and pending transactions mustn't be continued in any case.
+	 */
+
+	for (i = 1; i < S3C2410_ENDPOINTS; i++)
+		s3c2410_udc_nuke(dev, &dev->ep[i], -ECONNABORTED);
+}
+
+static inline int s3c2410_udc_fifo_count_out(void)
+{
+	int tmp;
+
+	tmp = udc_read(S3C2410_UDC_OUT_FIFO_CNT2_REG) << 8;
+	tmp |= udc_read(S3C2410_UDC_OUT_FIFO_CNT1_REG);
+	return tmp;
+}
+
+/*
+ *	s3c2410_udc_write_packet
+ */
+static inline int s3c2410_udc_write_packet(int fifo,
+		struct s3c2410_request *req,
+		unsigned max)
+{
+	unsigned len = min(req->req.length - req->req.actual, max);
+	u8 *buf = req->req.buf + req->req.actual;
+
+	prefetch(buf);
+
+	dprintk(DEBUG_VERBOSE, "%s %d %d %d %d\n", __func__,
+		req->req.actual, req->req.length, len, req->req.actual + len);
+
+	req->req.actual += len;
+
+	udelay(5);
+	writesb(base_addr + fifo, buf, len);
+	return len;
+}
+
+/*
+ *	s3c2410_udc_write_fifo
+ *
+ * return:  0 = still running, 1 = completed, negative = errno
+ */
+static int s3c2410_udc_write_fifo(struct s3c2410_ep *ep,
+		struct s3c2410_request *req)
+{
+	unsigned	count;
+	int		is_last;
+	u32		idx;
+	int		fifo_reg;
+	u32		ep_csr;
+
+	idx = ep->bEndpointAddress & 0x7F;
+	switch (idx) {
+	default:
+		idx = 0;
+	case 0:
+		fifo_reg = S3C2410_UDC_EP0_FIFO_REG;
+		break;
+	case 1:
+		fifo_reg = S3C2410_UDC_EP1_FIFO_REG;
+		break;
+	case 2:
+		fifo_reg = S3C2410_UDC_EP2_FIFO_REG;
+		break;
+	case 3:
+		fifo_reg = S3C2410_UDC_EP3_FIFO_REG;
+		break;
+	case 4:
+		fifo_reg = S3C2410_UDC_EP4_FIFO_REG;
+		break;
+	}
+
+	count = s3c2410_udc_write_packet(fifo_reg, req, ep->ep.maxpacket);
+
+	/* last packet is often short (sometimes a zlp) */
+	if (count != ep->ep.maxpacket)
+		is_last = 1;
+	else if (req->req.length != req->req.actual || req->req.zero)
+		is_last = 0;
+	else
+		is_last = 2;
+
+	/* Only ep0 debug messages are interesting */
+	if (idx == 0)
+		dprintk(DEBUG_NORMAL,
+			"Written ep%d %d.%d of %d b [last %d,z %d]\n",
+			idx, count, req->req.actual, req->req.length,
+			is_last, req->req.zero);
+
+	if (is_last) {
+		/* The order is important. It prevents sending 2 packets
+		 * at the same time */
+
+		if (idx == 0) {
+			/* Reset signal => no need to say 'data sent' */
+			if (! (udc_read(S3C2410_UDC_USB_INT_REG)
+					& S3C2410_UDC_USBINT_RESET))
+				s3c2410_udc_set_ep0_de_in(base_addr);
+			ep->dev->ep0state=EP0_IDLE;
+		} else {
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			ep_csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			udc_write(ep_csr | S3C2410_UDC_ICSR1_PKTRDY,
+					S3C2410_UDC_IN_CSR1_REG);
+		}
+
+		s3c2410_udc_done(ep, req, 0);
+		is_last = 1;
+	} else {
+		if (idx == 0) {
+			/* Reset signal => no need to say 'data sent' */
+			if (! (udc_read(S3C2410_UDC_USB_INT_REG)
+					& S3C2410_UDC_USBINT_RESET))
+				s3c2410_udc_set_ep0_ipr(base_addr);
+		} else {
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			ep_csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			udc_write(ep_csr | S3C2410_UDC_ICSR1_PKTRDY,
+					S3C2410_UDC_IN_CSR1_REG);
+		}
+	}
+
+	return is_last;
+}
+
+static inline int s3c2410_udc_read_packet(int fifo, u8 *buf,
+		struct s3c2410_request *req, unsigned avail)
+{
+	unsigned len;
+
+	len = min(req->req.length - req->req.actual, avail);
+	req->req.actual += len;
+
+	readsb(fifo + base_addr, buf, len);
+	return len;
+}
+
+/*
+ * return:  0 = still running, 1 = queue empty, negative = errno
+ */
+static int s3c2410_udc_read_fifo(struct s3c2410_ep *ep,
+				 struct s3c2410_request *req)
+{
+	u8		*buf;
+	u32		ep_csr;
+	unsigned	bufferspace;
+	int		is_last=1;
+	unsigned	avail;
+	int		fifo_count = 0;
+	u32		idx;
+	int		fifo_reg;
+
+	idx = ep->bEndpointAddress & 0x7F;
+
+	switch (idx) {
+	default:
+		idx = 0;
+	case 0:
+		fifo_reg = S3C2410_UDC_EP0_FIFO_REG;
+		break;
+	case 1:
+		fifo_reg = S3C2410_UDC_EP1_FIFO_REG;
+		break;
+	case 2:
+		fifo_reg = S3C2410_UDC_EP2_FIFO_REG;
+		break;
+	case 3:
+		fifo_reg = S3C2410_UDC_EP3_FIFO_REG;
+		break;
+	case 4:
+		fifo_reg = S3C2410_UDC_EP4_FIFO_REG;
+		break;
+	}
+
+	if (!req->req.length)
+		return 1;
+
+	buf = req->req.buf + req->req.actual;
+	bufferspace = req->req.length - req->req.actual;
+	if (!bufferspace) {
+		dprintk(DEBUG_NORMAL, "%s: buffer full!\n", __func__);
+		return -1;
+	}
+
+	udc_write(idx, S3C2410_UDC_INDEX_REG);
+
+	fifo_count = s3c2410_udc_fifo_count_out();
+	dprintk(DEBUG_NORMAL, "%s fifo count : %d\n", __func__, fifo_count);
+
+	if (fifo_count > ep->ep.maxpacket)
+		avail = ep->ep.maxpacket;
+	else
+		avail = fifo_count;
+
+	fifo_count = s3c2410_udc_read_packet(fifo_reg, buf, req, avail);
+
+	/* checking this with ep0 is not accurate as we already
+	 * read a control request
+	 **/
+	if (idx != 0 && fifo_count < ep->ep.maxpacket) {
+		is_last = 1;
+		/* overflowed this request?  flush extra data */
+		if (fifo_count != avail)
+			req->req.status = -EOVERFLOW;
+	} else {
+		is_last = (req->req.length <= req->req.actual) ? 1 : 0;
+	}
+
+	udc_write(idx, S3C2410_UDC_INDEX_REG);
+	fifo_count = s3c2410_udc_fifo_count_out();
+
+	/* Only ep0 debug messages are interesting */
+	if (idx == 0)
+		dprintk(DEBUG_VERBOSE, "%s fifo count : %d [last %d]\n",
+			__func__, fifo_count,is_last);
+
+	if (is_last) {
+		if (idx == 0) {
+			s3c2410_udc_set_ep0_de_out(base_addr);
+			ep->dev->ep0state = EP0_IDLE;
+		} else {
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			ep_csr = udc_read(S3C2410_UDC_OUT_CSR1_REG);
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			udc_write(ep_csr & ~S3C2410_UDC_OCSR1_PKTRDY,
+					S3C2410_UDC_OUT_CSR1_REG);
+		}
+
+		s3c2410_udc_done(ep, req, 0);
+	} else {
+		if (idx == 0) {
+			s3c2410_udc_clear_ep0_opr(base_addr);
+		} else {
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			ep_csr = udc_read(S3C2410_UDC_OUT_CSR1_REG);
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			udc_write(ep_csr & ~S3C2410_UDC_OCSR1_PKTRDY,
+					S3C2410_UDC_OUT_CSR1_REG);
+		}
+	}
+
+	return is_last;
+}
+
+static int s3c2410_udc_read_fifo_crq(struct usb_ctrlrequest *crq)
+{
+	unsigned char *outbuf = (unsigned char*)crq;
+	int bytes_read = 0;
+
+	udc_write(0, S3C2410_UDC_INDEX_REG);
+
+	bytes_read = s3c2410_udc_fifo_count_out();
+
+	dprintk(DEBUG_NORMAL, "%s: fifo_count=%d\n", __func__, bytes_read);
+
+	if (bytes_read > sizeof(struct usb_ctrlrequest))
+		bytes_read = sizeof(struct usb_ctrlrequest);
+
+	readsb(S3C2410_UDC_EP0_FIFO_REG + base_addr, outbuf, bytes_read);
+
+	dprintk(DEBUG_VERBOSE, "%s: len=%d %02x:%02x {%x,%x,%x}\n", __func__,
+		bytes_read, crq->bRequest, crq->bRequestType,
+		crq->wValue, crq->wIndex, crq->wLength);
+
+	return bytes_read;
+}
+
+static int s3c2410_udc_get_status(struct s3c2410_udc *dev,
+		struct usb_ctrlrequest *crq)
+{
+	u16 status = 0;
+	u8 ep_num = crq->wIndex & 0x7F;
+	u8 is_in = crq->wIndex & USB_DIR_IN;
+
+	switch (crq->bRequestType & USB_RECIP_MASK) {
+	case USB_RECIP_INTERFACE:
+		break;
+
+	case USB_RECIP_DEVICE:
+		status = dev->devstatus;
+		break;
+
+	case USB_RECIP_ENDPOINT:
+		if (ep_num > 4 || crq->wLength > 2)
+			return 1;
+
+		if (ep_num == 0) {
+			udc_write(0, S3C2410_UDC_INDEX_REG);
+			status = udc_read(S3C2410_UDC_IN_CSR1_REG);
+			status = status & S3C2410_UDC_EP0_CSR_SENDSTL;
+		} else {
+			udc_write(ep_num, S3C2410_UDC_INDEX_REG);
+			if (is_in) {
+				status = udc_read(S3C2410_UDC_IN_CSR1_REG);
+				status = status & S3C2410_UDC_ICSR1_SENDSTL;
+			} else {
+				status = udc_read(S3C2410_UDC_OUT_CSR1_REG);
+				status = status & S3C2410_UDC_OCSR1_SENDSTL;
+			}
+		}
+
+		status = status ? 1 : 0;
+		break;
+
+	default:
+		return 1;
+	}
+
+	/* Seems to be needed to get it working. ouch :( */
+	udelay(5);
+	udc_write(status & 0xFF, S3C2410_UDC_EP0_FIFO_REG);
+	udc_write(status >> 8, S3C2410_UDC_EP0_FIFO_REG);
+	s3c2410_udc_set_ep0_de_in(base_addr);
+
+	return 0;
+}
+/*------------------------- usb state machine -------------------------------*/
+static int s3c2410_udc_set_halt(struct usb_ep *_ep, int value);
+
+static void s3c2410_udc_handle_ep0_idle(struct s3c2410_udc *dev,
+					struct s3c2410_ep *ep,
+					struct usb_ctrlrequest *crq,
+					u32 ep0csr)
+{
+	int len, ret, tmp;
+
+	/* start control request? */
+	if (!(ep0csr & S3C2410_UDC_EP0_CSR_OPKRDY))
+		return;
+
+	s3c2410_udc_nuke(dev, ep, -EPROTO);
+
+	len = s3c2410_udc_read_fifo_crq(crq);
+	if (len != sizeof(*crq)) {
+		dprintk(DEBUG_NORMAL, "setup begin: fifo READ ERROR"
+			" wanted %d bytes got %d. Stalling out...\n",
+			sizeof(*crq), len);
+		s3c2410_udc_set_ep0_ss(base_addr);
+		return;
+	}
+
+	dprintk(DEBUG_NORMAL, "bRequest = %d bRequestType %d wLength = %d\n",
+		crq->bRequest, crq->bRequestType, crq->wLength);
+
+	/* cope with automagic for some standard requests. */
+	dev->req_std = (crq->bRequestType & USB_TYPE_MASK)
+		== USB_TYPE_STANDARD;
+	dev->req_config = 0;
+	dev->req_pending = 1;
+
+	switch (crq->bRequest) {
+	case USB_REQ_SET_CONFIGURATION:
+		dprintk(DEBUG_NORMAL, "USB_REQ_SET_CONFIGURATION ... \n");
+
+		if (crq->bRequestType == USB_RECIP_DEVICE) {
+			dev->req_config = 1;
+			s3c2410_udc_set_ep0_de_out(base_addr);
+		}
+		break;
+
+	case USB_REQ_SET_INTERFACE:
+		dprintk(DEBUG_NORMAL, "USB_REQ_SET_INTERFACE ... \n");
+
+		if (crq->bRequestType == USB_RECIP_INTERFACE) {
+			dev->req_config = 1;
+			s3c2410_udc_set_ep0_de_out(base_addr);
+		}
+		break;
+
+	case USB_REQ_SET_ADDRESS:
+		dprintk(DEBUG_NORMAL, "USB_REQ_SET_ADDRESS ... \n");
+
+		if (crq->bRequestType == USB_RECIP_DEVICE) {
+			tmp = crq->wValue & 0x7F;
+			dev->address = tmp;
+			udc_write((tmp | S3C2410_UDC_FUNCADDR_UPDATE),
+					S3C2410_UDC_FUNC_ADDR_REG);
+			s3c2410_udc_set_ep0_de_out(base_addr);
+			return;
+		}
+		break;
+
+	case USB_REQ_GET_STATUS:
+		dprintk(DEBUG_NORMAL, "USB_REQ_GET_STATUS ... \n");
+		s3c2410_udc_clear_ep0_opr(base_addr);
+
+		if (dev->req_std) {
+			if (!s3c2410_udc_get_status(dev, crq)) {
+				return;
+			}
+		}
+		break;
+
+	case USB_REQ_CLEAR_FEATURE:
+		s3c2410_udc_clear_ep0_opr(base_addr);
+
+		if (crq->bRequestType != USB_RECIP_ENDPOINT)
+			break;
+
+		if (crq->wValue != USB_ENDPOINT_HALT || crq->wLength != 0)
+			break;
+
+		s3c2410_udc_set_halt(&dev->ep[crq->wIndex & 0x7f].ep, 0);
+		s3c2410_udc_set_ep0_de_out(base_addr);
+		return;
+
+	case USB_REQ_SET_FEATURE:
+		s3c2410_udc_clear_ep0_opr(base_addr);
+
+		if (crq->bRequestType != USB_RECIP_ENDPOINT)
+			break;
+
+		if (crq->wValue != USB_ENDPOINT_HALT || crq->wLength != 0)
+			break;
+
+		s3c2410_udc_set_halt(&dev->ep[crq->wIndex & 0x7f].ep, 1);
+		s3c2410_udc_set_ep0_de_out(base_addr);
+		return;
+
+	default:
+		s3c2410_udc_clear_ep0_opr(base_addr);
+		break;
+	}
+
+	if (crq->bRequestType & USB_DIR_IN)
+		dev->ep0state = EP0_IN_DATA_PHASE;
+	else
+		dev->ep0state = EP0_OUT_DATA_PHASE;
+
+	ret = dev->driver->setup(&dev->gadget, crq);
+	if (ret < 0) {
+		if (dev->req_config) {
+			dprintk(DEBUG_NORMAL, "config change %02x fail %d?\n",
+				crq->bRequest, ret);
+			return;
+		}
+
+		if (ret == -EOPNOTSUPP)
+			dprintk(DEBUG_NORMAL, "Operation not supported\n");
+		else
+			dprintk(DEBUG_NORMAL,
+				"dev->driver->setup failed. (%d)\n", ret);
+
+		udelay(5);
+		s3c2410_udc_set_ep0_ss(base_addr);
+		s3c2410_udc_set_ep0_de_out(base_addr);
+		dev->ep0state = EP0_IDLE;
+		/* deferred i/o == no response yet */
+	} else if (dev->req_pending) {
+		dprintk(DEBUG_VERBOSE, "dev->req_pending... what now?\n");
+		dev->req_pending=0;
+	}
+
+	dprintk(DEBUG_VERBOSE, "ep0state %s\n", ep0states[dev->ep0state]);
+}
+
+static void s3c2410_udc_handle_ep0(struct s3c2410_udc *dev)
+{
+	u32			ep0csr;
+	struct s3c2410_ep	*ep = &dev->ep[0];
+	struct s3c2410_request	*req;
+	struct usb_ctrlrequest	crq;
+
+	if (list_empty(&ep->queue))
+		req = NULL;
+	else
+		req = list_entry(ep->queue.next, struct s3c2410_request, queue);
+
+	/* We make the assumption that S3C2410_UDC_IN_CSR1_REG equal to
+	 * S3C2410_UDC_EP0_CSR_REG when index is zero */
+
+	udc_write(0, S3C2410_UDC_INDEX_REG);
+	ep0csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
+
+	dprintk(DEBUG_NORMAL, "ep0csr %x ep0state %s\n",
+		ep0csr, ep0states[dev->ep0state]);
+
+	/* clear stall status */
+	if (ep0csr & S3C2410_UDC_EP0_CSR_SENTSTL) {
+		s3c2410_udc_nuke(dev, ep, -EPIPE);
+		dprintk(DEBUG_NORMAL, "... clear SENT_STALL ...\n");
+		s3c2410_udc_clear_ep0_sst(base_addr);
+		dev->ep0state = EP0_IDLE;
+		return;
+	}
+
+	/* clear setup end */
+	if (ep0csr & S3C2410_UDC_EP0_CSR_SE) {
+		dprintk(DEBUG_NORMAL, "... serviced SETUP_END ...\n");
+		s3c2410_udc_nuke(dev, ep, 0);
+		s3c2410_udc_clear_ep0_se(base_addr);
+		dev->ep0state = EP0_IDLE;
+	}
+
+	switch (dev->ep0state) {
+	case EP0_IDLE:
+		s3c2410_udc_handle_ep0_idle(dev, ep, &crq, ep0csr);
+		break;
+
+	case EP0_IN_DATA_PHASE:			/* GET_DESCRIPTOR etc */
+		dprintk(DEBUG_NORMAL, "EP0_IN_DATA_PHASE ... what now?\n");
+		if (!(ep0csr & S3C2410_UDC_EP0_CSR_IPKRDY) && req) {
+			s3c2410_udc_write_fifo(ep, req);
+		}
+		break;
+
+	case EP0_OUT_DATA_PHASE:		/* SET_DESCRIPTOR etc */
+		dprintk(DEBUG_NORMAL, "EP0_OUT_DATA_PHASE ... what now?\n");
+		if ((ep0csr & S3C2410_UDC_EP0_CSR_OPKRDY) && req ) {
+			s3c2410_udc_read_fifo(ep,req);
+		}
+		break;
+
+	case EP0_END_XFER:
+		dprintk(DEBUG_NORMAL, "EP0_END_XFER ... what now?\n");
+		dev->ep0state = EP0_IDLE;
+		break;
+
+	case EP0_STALL:
+		dprintk(DEBUG_NORMAL, "EP0_STALL ... what now?\n");
+		dev->ep0state = EP0_IDLE;
+		break;
+	}
+}
+
+/*
+ *	handle_ep - Manage I/O endpoints
+ */
+
+static void s3c2410_udc_handle_ep(struct s3c2410_ep *ep)
+{
+	struct s3c2410_request	*req;
+	int			is_in = ep->bEndpointAddress & USB_DIR_IN;
+	u32			ep_csr1;
+	u32			idx;
+
+	if (likely (!list_empty(&ep->queue)))
+		req = list_entry(ep->queue.next,
+				struct s3c2410_request, queue);
+	else
+		req = NULL;
+
+	idx = ep->bEndpointAddress & 0x7F;
+
+	if (is_in) {
+		udc_write(idx, S3C2410_UDC_INDEX_REG);
+		ep_csr1 = udc_read(S3C2410_UDC_IN_CSR1_REG);
+		dprintk(DEBUG_VERBOSE, "ep%01d write csr:%02x %d\n",
+			idx, ep_csr1, req ? 1 : 0);
+
+		if (ep_csr1 & S3C2410_UDC_ICSR1_SENTSTL) {
+			dprintk(DEBUG_VERBOSE, "st\n");
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			udc_write(ep_csr1 & ~S3C2410_UDC_ICSR1_SENTSTL,
+					S3C2410_UDC_IN_CSR1_REG);
+			return;
+		}
+
+		if (!(ep_csr1 & S3C2410_UDC_ICSR1_PKTRDY) && req) {
+			s3c2410_udc_write_fifo(ep,req);
+		}
+	} else {
+		udc_write(idx, S3C2410_UDC_INDEX_REG);
+		ep_csr1 = udc_read(S3C2410_UDC_OUT_CSR1_REG);
+		dprintk(DEBUG_VERBOSE, "ep%01d rd csr:%02x\n", idx, ep_csr1);
+
+		if (ep_csr1 & S3C2410_UDC_OCSR1_SENTSTL) {
+			udc_write(idx, S3C2410_UDC_INDEX_REG);
+			udc_write(ep_csr1 & ~S3C2410_UDC_OCSR1_SENTSTL,
+					S3C2410_UDC_OUT_CSR1_REG);
+			return;
+		}
+
+		if ((ep_csr1 & S3C2410_UDC_OCSR1_PKTRDY) && req) {
+			s3c2410_udc_read_fifo(ep,req);
+		}
+	}
+}
+
+#include <asm/arch/regs-irq.h>
+
+/*
+ *	s3c2410_udc_irq - interrupt handler
+ */
+static irqreturn_t s3c2410_udc_irq(int irq, void *_dev)
+{
+	struct s3c2410_udc *dev = _dev;
+	int usb_status;
+	int usbd_status;
+	int pwr_reg;
+	int ep0csr;
+	int i;
+	u32 idx;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	/* Driver connected ? */
+	if (!dev->driver) {
+		/* Clear interrupts */
+		udc_write(udc_read(S3C2410_UDC_USB_INT_REG),
+				S3C2410_UDC_USB_INT_REG);
+		udc_write(udc_read(S3C2410_UDC_EP_INT_REG),
+				S3C2410_UDC_EP_INT_REG);
+	}
+
+	/* Save index */
+	idx = udc_read(S3C2410_UDC_INDEX_REG);
+
+	/* Read status registers */
+	usb_status = udc_read(S3C2410_UDC_USB_INT_REG);
+	usbd_status = udc_read(S3C2410_UDC_EP_INT_REG);
+	pwr_reg = udc_read(S3C2410_UDC_PWR_REG);
+
+	udc_writeb(base_addr, S3C2410_UDC_INDEX_EP0, S3C2410_UDC_INDEX_REG);
+	ep0csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
+
+	dprintk(DEBUG_NORMAL, "usbs=%02x, usbds=%02x, pwr=%02x ep0csr=%02x\n",
+		usb_status, usbd_status, pwr_reg, ep0csr);
+
+	/*
+	 * Now, handle interrupts. There's two types :
+	 * - Reset, Resume, Suspend coming -> usb_int_reg
+	 * - EP -> ep_int_reg
+	 */
+
+	/* RESET */
+	if (usb_status & S3C2410_UDC_USBINT_RESET) {
+		/* two kind of reset :
+		 * - reset start -> pwr reg = 8
+		 * - reset end   -> pwr reg = 0
+		 **/
+		dprintk(DEBUG_NORMAL, "USB reset csr %x pwr %x\n",
+			ep0csr, pwr_reg);
+
+		dev->gadget.speed = USB_SPEED_UNKNOWN;
+		udc_write(0x00, S3C2410_UDC_INDEX_REG);
+		udc_write((dev->ep[0].ep.maxpacket & 0x7ff) >> 3,
+				S3C2410_UDC_MAXP_REG);
+		dev->address = 0;
+
+		dev->ep0state = EP0_IDLE;
+		dev->gadget.speed = USB_SPEED_FULL;
+
+		/* clear interrupt */
+		udc_write(S3C2410_UDC_USBINT_RESET,
+				S3C2410_UDC_USB_INT_REG);
+
+		udc_write(idx, S3C2410_UDC_INDEX_REG);
+		spin_unlock_irqrestore(&dev->lock, flags);
+		return IRQ_HANDLED;
+	}
+
+	/* RESUME */
+	if (usb_status & S3C2410_UDC_USBINT_RESUME) {
+		dprintk(DEBUG_NORMAL, "USB resume\n");
+
+		/* clear interrupt */
+		udc_write(S3C2410_UDC_USBINT_RESUME,
+				S3C2410_UDC_USB_INT_REG);
+
+		if (dev->gadget.speed != USB_SPEED_UNKNOWN
+				&& dev->driver
+				&& dev->driver->resume)
+			dev->driver->resume(&dev->gadget);
+	}
+
+	/* SUSPEND */
+	if (usb_status & S3C2410_UDC_USBINT_SUSPEND) {
+		dprintk(DEBUG_NORMAL, "USB suspend\n");
+
+		/* clear interrupt */
+		udc_write(S3C2410_UDC_USBINT_SUSPEND,
+				S3C2410_UDC_USB_INT_REG);
+
+		if (dev->gadget.speed != USB_SPEED_UNKNOWN
+				&& dev->driver
+				&& dev->driver->suspend)
+			dev->driver->suspend(&dev->gadget);
+
+		dev->ep0state = EP0_IDLE;
+	}
+
+	/* EP */
+	/* control traffic */
+	/* check on ep0csr != 0 is not a good idea as clearing in_pkt_ready
+	 * generate an interrupt
+	 */
+	if (usbd_status & S3C2410_UDC_INT_EP0) {
+		dprintk(DEBUG_VERBOSE, "USB ep0 irq\n");
+		/* Clear the interrupt bit by setting it to 1 */
+		udc_write(S3C2410_UDC_INT_EP0, S3C2410_UDC_EP_INT_REG);
+		s3c2410_udc_handle_ep0(dev);
+	}
+
+	/* endpoint data transfers */
+	for (i = 1; i < S3C2410_ENDPOINTS; i++) {
+		u32 tmp = 1 << i;
+		if (usbd_status & tmp) {
+			dprintk(DEBUG_VERBOSE, "USB ep%d irq\n", i);
+
+			/* Clear the interrupt bit by setting it to 1 */
+			udc_write(tmp, S3C2410_UDC_EP_INT_REG);
+			s3c2410_udc_handle_ep(&dev->ep[i]);
+		}
+	}
+
+	dprintk(DEBUG_VERBOSE, "irq: %d s3c2410_udc_done.\n", irq);
+
+	/* Restore old index */
+	udc_write(idx, S3C2410_UDC_INDEX_REG);
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	return IRQ_HANDLED;
+}
+/*------------------------- s3c2410_ep_ops ----------------------------------*/
+
+static inline struct s3c2410_ep *to_s3c2410_ep(struct usb_ep *ep)
+{
+	return container_of(ep, struct s3c2410_ep, ep);
+}
+
+static inline struct s3c2410_udc *to_s3c2410_udc(struct usb_gadget *gadget)
+{
+	return container_of(gadget, struct s3c2410_udc, gadget);
+}
+
+static inline struct s3c2410_request *to_s3c2410_req(struct usb_request *req)
+{
+	return container_of(req, struct s3c2410_request, req);
+}
+
+/*
+ *	s3c2410_udc_ep_enable
+ */
+static int s3c2410_udc_ep_enable(struct usb_ep *_ep,
+				 const struct usb_endpoint_descriptor *desc)
+{
+	struct s3c2410_udc	*dev;
+	struct s3c2410_ep	*ep;
+	u32			max, tmp;
+	unsigned long		flags;
+	u32			csr1,csr2;
+	u32			int_en_reg;
+
+	ep = to_s3c2410_ep(_ep);
+
+	if (!_ep || !desc || ep->desc
+			|| _ep->name == ep0name
+			|| desc->bDescriptorType != USB_DT_ENDPOINT)
+		return -EINVAL;
+
+	dev = ep->dev;
+	if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
+		return -ESHUTDOWN;
+
+	max = le16_to_cpu(desc->wMaxPacketSize) & 0x1fff;
+
+	local_irq_save (flags);
+	_ep->maxpacket = max & 0x7ff;
+	ep->desc = desc;
+	ep->halted = 0;
+	ep->bEndpointAddress = desc->bEndpointAddress;
+
+	/* set max packet */
+	udc_write(ep->num, S3C2410_UDC_INDEX_REG);
+	udc_write(max >> 3, S3C2410_UDC_MAXP_REG);
+
+	/* set type, direction, address; reset fifo counters */
+	if (desc->bEndpointAddress & USB_DIR_IN) {
+		csr1 = S3C2410_UDC_ICSR1_FFLUSH|S3C2410_UDC_ICSR1_CLRDT;
+		csr2 = S3C2410_UDC_ICSR2_MODEIN|S3C2410_UDC_ICSR2_DMAIEN;
+
+		udc_write(ep->num, S3C2410_UDC_INDEX_REG);
+		udc_write(csr1, S3C2410_UDC_IN_CSR1_REG);
+		udc_write(ep->num, S3C2410_UDC_INDEX_REG);
+		udc_write(csr2, S3C2410_UDC_IN_CSR2_REG);
+	} else {
+		/* don't flush in fifo or it will cause endpoint interrupt */
+		csr1 = S3C2410_UDC_ICSR1_CLRDT;
+		csr2 = S3C2410_UDC_ICSR2_DMAIEN;
+
+		udc_write(ep->num, S3C2410_UDC_INDEX_REG);
+		udc_write(csr1, S3C2410_UDC_IN_CSR1_REG);
+		udc_write(ep->num, S3C2410_UDC_INDEX_REG);
+		udc_write(csr2, S3C2410_UDC_IN_CSR2_REG);
+
+		csr1 = S3C2410_UDC_OCSR1_FFLUSH | S3C2410_UDC_OCSR1_CLRDT;
+		csr2 = S3C2410_UDC_OCSR2_DMAIEN;
+
+		udc_write(ep->num, S3C2410_UDC_INDEX_REG);
+		udc_write(csr1, S3C2410_UDC_OUT_CSR1_REG);
+		udc_write(ep->num, S3C2410_UDC_INDEX_REG);
+		udc_write(csr2, S3C2410_UDC_OUT_CSR2_REG);
+	}
+
+	/* enable irqs */
+	int_en_reg = udc_read(S3C2410_UDC_EP_INT_EN_REG);
+	udc_write(int_en_reg | (1 << ep->num), S3C2410_UDC_EP_INT_EN_REG);
+
+	/* print some debug message */
+	tmp = desc->bEndpointAddress;
+	dprintk (DEBUG_NORMAL, "enable %s(%d) ep%x%s-blk max %02x\n",
+		 _ep->name,ep->num, tmp,
+		 desc->bEndpointAddress & USB_DIR_IN ? "in" : "out", max);
+
+	local_irq_restore (flags);
+	s3c2410_udc_set_halt(_ep, 0);
+
+	return 0;
+}
+
+/*
+ * s3c2410_udc_ep_disable
+ */
+static int s3c2410_udc_ep_disable(struct usb_ep *_ep)
+{
+	struct s3c2410_ep *ep = to_s3c2410_ep(_ep);
+	unsigned long flags;
+	u32 int_en_reg;
+
+	if (!_ep || !ep->desc) {
+		dprintk(DEBUG_NORMAL, "%s not enabled\n",
+			_ep ? ep->ep.name : NULL);
+		return -EINVAL;
+	}
+
+	local_irq_save(flags);
+
+	dprintk(DEBUG_NORMAL, "ep_disable: %s\n", _ep->name);
+
+	ep->desc = NULL;
+	ep->halted = 1;
+
+	s3c2410_udc_nuke (ep->dev, ep, -ESHUTDOWN);
+
+	/* disable irqs */
+	int_en_reg = udc_read(S3C2410_UDC_EP_INT_EN_REG);
+	udc_write(int_en_reg & ~(1<<ep->num), S3C2410_UDC_EP_INT_EN_REG);
+
+	local_irq_restore(flags);
+
+	dprintk(DEBUG_NORMAL, "%s disabled\n", _ep->name);
+
+	return 0;
+}
+
+/*
+ * s3c2410_udc_alloc_request
+ */
+static struct usb_request *
+s3c2410_udc_alloc_request(struct usb_ep *_ep, gfp_t mem_flags)
+{
+	struct s3c2410_request *req;
+
+	dprintk(DEBUG_VERBOSE,"%s(%p,%d)\n", __func__, _ep, mem_flags);
+
+	if (!_ep)
+		return NULL;
+
+	req = kzalloc (sizeof(struct s3c2410_request), mem_flags);
+	if (!req)
+		return NULL;
+
+	INIT_LIST_HEAD (&req->queue);
+	return &req->req;
+}
+
+/*
+ * s3c2410_udc_free_request
+ */
+static void
+s3c2410_udc_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct s3c2410_ep	*ep = to_s3c2410_ep(_ep);
+	struct s3c2410_request	*req = to_s3c2410_req(_req);
+
+	dprintk(DEBUG_VERBOSE, "%s(%p,%p)\n", __func__, _ep, _req);
+
+	if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
+		return;
+
+	WARN_ON (!list_empty (&req->queue));
+	kfree(req);
+}
+
+/*
+ *	s3c2410_udc_alloc_buffer
+ */
+static void *s3c2410_udc_alloc_buffer(struct usb_ep *_ep,
+		unsigned bytes, dma_addr_t *dma, gfp_t mem_flags)
+{
+	char *retval;
+
+	dprintk(DEBUG_VERBOSE, "%s()\n", __func__);
+
+	if (!the_controller->driver)
+		return NULL;
+
+	retval = kmalloc (bytes, mem_flags);
+	*dma = (dma_addr_t) retval;
+	return retval;
+}
+
+/*
+ * s3c2410_udc_free_buffer
+ */
+static void s3c2410_udc_free_buffer (struct usb_ep *_ep, void *buf,
+		dma_addr_t dma, unsigned bytes)
+{
+	dprintk(DEBUG_VERBOSE, "%s()\n", __func__);
+
+	if (bytes)
+		kfree (buf);
+}
+
+/*
+ *	s3c2410_udc_queue
+ */
+static int s3c2410_udc_queue(struct usb_ep *_ep, struct usb_request *_req,
+		gfp_t gfp_flags)
+{
+	struct s3c2410_request	*req = to_s3c2410_req(_req);
+	struct s3c2410_ep	*ep = to_s3c2410_ep(_ep);
+	struct s3c2410_udc	*dev;
+	u32			ep_csr = 0;
+	int			fifo_count = 0;
+	unsigned long		flags;
+
+	if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
+		dprintk(DEBUG_NORMAL, "%s: invalid args\n", __func__);
+		return -EINVAL;
+	}
+
+	dev = ep->dev;
+	if (unlikely (!dev->driver
+			|| dev->gadget.speed == USB_SPEED_UNKNOWN)) {
+		return -ESHUTDOWN;
+	}
+
+	local_irq_save (flags);
+
+	if (unlikely(!_req || !_req->complete
+			|| !_req->buf || !list_empty(&req->queue))) {
+		if (!_req)
+			dprintk(DEBUG_NORMAL, "%s: 1 X X X\n", __func__);
+		else {
+			dprintk(DEBUG_NORMAL, "%s: 0 %01d %01d %01d\n",
+				__func__, !_req->complete,!_req->buf,
+				!list_empty(&req->queue));
+		}
+
+		local_irq_restore(flags);
+		return -EINVAL;
+	}
+
+	_req->status = -EINPROGRESS;
+	_req->actual = 0;
+
+	dprintk(DEBUG_VERBOSE, "%s: ep%x len %d\n",
+		 __func__, ep->bEndpointAddress, _req->length);
+
+	if (ep->bEndpointAddress) {
+		udc_write(ep->bEndpointAddress & 0x7F, S3C2410_UDC_INDEX_REG);
+
+		ep_csr = udc_read((ep->bEndpointAddress & USB_DIR_IN)
+				? S3C2410_UDC_IN_CSR1_REG
+				: S3C2410_UDC_OUT_CSR1_REG);
+		fifo_count = s3c2410_udc_fifo_count_out();
+	} else {
+		udc_write(0, S3C2410_UDC_INDEX_REG);
+		ep_csr = udc_read(S3C2410_UDC_IN_CSR1_REG);
+		fifo_count = s3c2410_udc_fifo_count_out();
+	}
+
+	/* kickstart this i/o queue? */
+	if (list_empty(&ep->queue) && !ep->halted) {
+		if (ep->bEndpointAddress == 0 /* ep0 */) {
+			switch (dev->ep0state) {
+			case EP0_IN_DATA_PHASE:
+				if (!(ep_csr&S3C2410_UDC_EP0_CSR_IPKRDY)
+						&& s3c2410_udc_write_fifo(ep,
+							req)) {
+					dev->ep0state = EP0_IDLE;
+					req = NULL;
+				}
+				break;
+
+			case EP0_OUT_DATA_PHASE:
+				if ((!_req->length)
+					|| ((ep_csr & S3C2410_UDC_OCSR1_PKTRDY)
+						&& s3c2410_udc_read_fifo(ep,
+							req))) {
+					dev->ep0state = EP0_IDLE;
+					req = NULL;
+				}
+				break;
+
+			default:
+				local_irq_restore(flags);
+				return -EL2HLT;
+			}
+		} else if ((ep->bEndpointAddress & USB_DIR_IN) != 0
+				&& (!(ep_csr&S3C2410_UDC_OCSR1_PKTRDY))
+				&& s3c2410_udc_write_fifo(ep, req)) {
+			req = NULL;
+		} else if ((ep_csr & S3C2410_UDC_OCSR1_PKTRDY)
+				&& fifo_count
+				&& s3c2410_udc_read_fifo(ep, req)) {
+			req = NULL;
+		}
+	}
+
+	/* pio or dma irq handler advances the queue. */
+	if (likely (req != 0))
+		list_add_tail(&req->queue, &ep->queue);
+
+	local_irq_restore(flags);
+
+	dprintk(DEBUG_VERBOSE, "%s ok\n", __func__);
+	return 0;
+}
+
+/*
+ *	s3c2410_udc_dequeue
+ */
+static int s3c2410_udc_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct s3c2410_ep	*ep = to_s3c2410_ep(_ep);
+	struct s3c2410_udc	*udc;
+	int			retval = -EINVAL;
+	unsigned long		flags;
+	struct s3c2410_request	*req = NULL;
+
+	dprintk(DEBUG_VERBOSE, "%s(%p,%p)\n", __func__, _ep, _req);
+
+	if (!the_controller->driver)
+		return -ESHUTDOWN;
+
+	if (!_ep || !_req)
+		return retval;
+
+	udc = to_s3c2410_udc(ep->gadget);
+
+	local_irq_save (flags);
+
+	list_for_each_entry (req, &ep->queue, queue) {
+		if (&req->req == _req) {
+			list_del_init (&req->queue);
+			_req->status = -ECONNRESET;
+			retval = 0;
+			break;
+		}
+	}
+
+	if (retval == 0) {
+		dprintk(DEBUG_VERBOSE,
+			"dequeued req %p from %s, len %d buf %p\n",
+			req, _ep->name, _req->length, _req->buf);
+
+		s3c2410_udc_done(ep, req, -ECONNRESET);
+	}
+
+	local_irq_restore (flags);
+	return retval;
+}
+
+/*
+ * s3c2410_udc_set_halt
+ */
+static int s3c2410_udc_set_halt(struct usb_ep *_ep, int value)
+{
+	struct s3c2410_ep	*ep = to_s3c2410_ep(_ep);
+	u32			ep_csr = 0;
+	unsigned long		flags;
+	u32			idx;
+
+	if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
+		dprintk(DEBUG_NORMAL, "%s: inval 2\n", __func__);
+		return -EINVAL;
+	}
+
+	local_irq_save (flags);
+
+	idx = ep->bEndpointAddress & 0x7F;
+
+	if (idx == 0) {
+		s3c2410_udc_set_ep0_ss(base_addr);
+		s3c2410_udc_set_ep0_de_out(base_addr);
+	} else {
+		udc_write(idx, S3C2410_UDC_INDEX_REG);
+		ep_csr = udc_read((ep->bEndpointAddress &USB_DIR_IN)
+				? S3C2410_UDC_IN_CSR1_REG
+				: S3C2410_UDC_OUT_CSR1_REG);
+
+		if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
+			if (value)
+				udc_write(ep_csr | S3C2410_UDC_ICSR1_SENDSTL,
+					S3C2410_UDC_IN_CSR1_REG);
+			else {
+				ep_csr &= ~S3C2410_UDC_ICSR1_SENDSTL;
+				udc_write(ep_csr, S3C2410_UDC_IN_CSR1_REG);
+				ep_csr |= S3C2410_UDC_ICSR1_CLRDT;
+				udc_write(ep_csr, S3C2410_UDC_IN_CSR1_REG);
+			}
+		} else {
+			if (value)
+				udc_write(ep_csr | S3C2410_UDC_OCSR1_SENDSTL,
+					S3C2410_UDC_OUT_CSR1_REG);
+			else {
+				ep_csr &= ~S3C2410_UDC_OCSR1_SENDSTL;
+				udc_write(ep_csr, S3C2410_UDC_OUT_CSR1_REG);
+				ep_csr |= S3C2410_UDC_OCSR1_CLRDT;
+				udc_write(ep_csr, S3C2410_UDC_OUT_CSR1_REG);
+			}
+		}
+	}
+
+	ep->halted = value ? 1 : 0;
+	local_irq_restore (flags);
+
+	return 0;
+}
+
+static const struct usb_ep_ops s3c2410_ep_ops = {
+	.enable		= s3c2410_udc_ep_enable,
+	.disable	= s3c2410_udc_ep_disable,
+
+	.alloc_request	= s3c2410_udc_alloc_request,
+	.free_request	= s3c2410_udc_free_request,
+
+	.alloc_buffer	= s3c2410_udc_alloc_buffer,
+	.free_buffer	= s3c2410_udc_free_buffer,
+
+	.queue		= s3c2410_udc_queue,
+	.dequeue	= s3c2410_udc_dequeue,
+
+	.set_halt	= s3c2410_udc_set_halt,
+};
+
+/*------------------------- usb_gadget_ops ----------------------------------*/
+
+/*
+ *	s3c2410_udc_get_frame
+ */
+static int s3c2410_udc_get_frame(struct usb_gadget *_gadget)
+{
+	int tmp;
+
+	dprintk(DEBUG_VERBOSE, "%s()\n", __func__);
+
+	tmp = udc_read(S3C2410_UDC_FRAME_NUM2_REG) << 8;
+	tmp |= udc_read(S3C2410_UDC_FRAME_NUM1_REG);
+	return tmp;
+}
+
+/*
+ *	s3c2410_udc_wakeup
+ */
+static int s3c2410_udc_wakeup(struct usb_gadget *_gadget)
+{
+	dprintk(DEBUG_NORMAL, "%s()\n", __func__);
+	return 0;
+}
+
+/*
+ *	s3c2410_udc_set_selfpowered
+ */
+static int s3c2410_udc_set_selfpowered(struct usb_gadget *gadget, int value)
+{
+	struct s3c2410_udc *udc = to_s3c2410_udc(gadget);
+
+	dprintk(DEBUG_NORMAL, "%s()\n", __func__);
+
+	if (value)
+		udc->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
+	else
+		udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
+
+	return 0;
+}
+
+static void s3c2410_udc_disable(struct s3c2410_udc *dev);
+static void s3c2410_udc_enable(struct s3c2410_udc *dev);
+
+static int s3c2410_udc_set_pullup(struct s3c2410_udc *udc, int is_on)
+{
+	dprintk(DEBUG_NORMAL, "%s()\n", __func__);
+
+	if (udc_info && udc_info->udc_command) {
+		if (is_on)
+			s3c2410_udc_enable(udc);
+		else {
+			if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
+				if (udc->driver && udc->driver->disconnect)
+					udc->driver->disconnect(&udc->gadget);
+
+			}
+			s3c2410_udc_disable(udc);
+		}
+	}
+	else
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
+static int s3c2410_udc_vbus_session(struct usb_gadget *gadget, int is_active)
+{
+	struct s3c2410_udc *udc = to_s3c2410_udc(gadget);
+
+	dprintk(DEBUG_NORMAL, "%s()\n", __func__);
+
+	udc->vbus = (is_active != 0);
+	s3c2410_udc_set_pullup(udc, is_active);
+	return 0;
+}
+
+static int s3c2410_udc_pullup(struct usb_gadget *gadget, int is_on)
+{
+	struct s3c2410_udc *udc = to_s3c2410_udc(gadget);
+
+	dprintk(DEBUG_NORMAL, "%s()\n", __func__);
+
+	s3c2410_udc_set_pullup(udc, is_on ? 0 : 1);
+	return 0;
+}
+
+static irqreturn_t s3c2410_udc_vbus_irq(int irq, void *_dev)
+{
+	struct s3c2410_udc	*dev = _dev;
+	unsigned int		value;
+
+	dprintk(DEBUG_NORMAL, "%s()\n", __func__);
+	value = s3c2410_gpio_getpin(udc_info->vbus_pin);
+
+	if (udc_info->vbus_pin_inverted)
+		value = !value;
+
+	if (value != dev->vbus)
+		s3c2410_udc_vbus_session(&dev->gadget, value);
+
+	return IRQ_HANDLED;
+}
+
+static int s3c2410_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
+{
+	dprintk(DEBUG_NORMAL, "%s()\n", __func__);
+
+	if (udc_info && udc_info->vbus_draw) {
+		udc_info->vbus_draw(ma);
+		return 0;
+	}
+
+	return -ENOTSUPP;
+}
+
+static const struct usb_gadget_ops s3c2410_ops = {
+	.get_frame		= s3c2410_udc_get_frame,
+	.wakeup			= s3c2410_udc_wakeup,
+	.set_selfpowered	= s3c2410_udc_set_selfpowered,
+	.pullup			= s3c2410_udc_pullup,
+	.vbus_session		= s3c2410_udc_vbus_session,
+	.vbus_draw		= s3c2410_vbus_draw,
+};
+
+/*------------------------- gadget driver handling---------------------------*/
+/*
+ * s3c2410_udc_disable
+ */
+static void s3c2410_udc_disable(struct s3c2410_udc *dev)
+{
+	dprintk(DEBUG_NORMAL, "%s()\n", __func__);
+
+	/* Disable all interrupts */
+	udc_write(0x00, S3C2410_UDC_USB_INT_EN_REG);
+	udc_write(0x00, S3C2410_UDC_EP_INT_EN_REG);
+
+	/* Clear the interrupt registers */
+	udc_write(S3C2410_UDC_USBINT_RESET
+				| S3C2410_UDC_USBINT_RESUME
+				| S3C2410_UDC_USBINT_SUSPEND,
+			S3C2410_UDC_USB_INT_REG);
+
+	udc_write(0x1F, S3C2410_UDC_EP_INT_REG);
+
+	/* Good bye, cruel world */
+	if (udc_info && udc_info->udc_command)
+		udc_info->udc_command(S3C2410_UDC_P_DISABLE);
+
+	/* Set speed to unknown */
+	dev->gadget.speed = USB_SPEED_UNKNOWN;
+}
+
+/*
+ * s3c2410_udc_reinit
+ */
+static void s3c2410_udc_reinit(struct s3c2410_udc *dev)
+{
+	u32 i;
+
+	/* device/ep0 records init */
+	INIT_LIST_HEAD (&dev->gadget.ep_list);
+	INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
+	dev->ep0state = EP0_IDLE;
+
+	for (i = 0; i < S3C2410_ENDPOINTS; i++) {
+		struct s3c2410_ep *ep = &dev->ep[i];
+
+		if (i != 0)
+			list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
+
+		ep->dev = dev;
+		ep->desc = NULL;
+		ep->halted = 0;
+		INIT_LIST_HEAD (&ep->queue);
+	}
+}
+
+/*
+ * s3c2410_udc_enable
+ */
+static void s3c2410_udc_enable(struct s3c2410_udc *dev)
+{
+	int i;
+
+	dprintk(DEBUG_NORMAL, "s3c2410_udc_enable called\n");
+
+	/* dev->gadget.speed = USB_SPEED_UNKNOWN; */
+	dev->gadget.speed = USB_SPEED_FULL;
+
+	/* Set MAXP for all endpoints */
+	for (i = 0; i < S3C2410_ENDPOINTS; i++) {
+		udc_write(i, S3C2410_UDC_INDEX_REG);
+		udc_write((dev->ep[i].ep.maxpacket & 0x7ff) >> 3,
+				S3C2410_UDC_MAXP_REG);
+	}
+
+	/* Set default power state */
+	udc_write(DEFAULT_POWER_STATE, S3C2410_UDC_PWR_REG);
+
+	/* Enable reset and suspend interrupt interrupts */
+	udc_write(S3C2410_UDC_USBINT_RESET | S3C2410_UDC_USBINT_SUSPEND,
+			S3C2410_UDC_USB_INT_EN_REG);
+
+	/* Enable ep0 interrupt */
+	udc_write(S3C2410_UDC_INT_EP0, S3C2410_UDC_EP_INT_EN_REG);
+
+	/* time to say "hello, world" */
+	if (udc_info && udc_info->udc_command)
+		udc_info->udc_command(S3C2410_UDC_P_ENABLE);
+}
+
+/*
+ *	usb_gadget_register_driver
+ */
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+	struct s3c2410_udc *udc = the_controller;
+	int		retval;
+
+	dprintk(DEBUG_NORMAL, "usb_gadget_register_driver() '%s'\n",
+		driver->driver.name);
+
+	/* Sanity checks */
+	if (!udc)
+		return -ENODEV;
+
+	if (udc->driver)
+		return -EBUSY;
+
+	if (!driver->bind || !driver->setup
+			|| driver->speed != USB_SPEED_FULL) {
+		printk(KERN_ERR "Invalid driver: bind %p setup %p speed %d\n",
+			driver->bind, driver->setup, driver->speed);
+		return -EINVAL;
+	}
+#if defined(MODULE)
+	if (!driver->unbind) {
+		printk(KERN_ERR "Invalid driver: no unbind method\n");
+		return -EINVAL;
+	}
+#endif
+
+	/* Hook the driver */
+	udc->driver = driver;
+	udc->gadget.dev.driver = &driver->driver;
+
+	/* Bind the driver */
+	if ((retval = device_add(&udc->gadget.dev)) != 0) {
+		printk(KERN_ERR "Error in device_add() : %d\n",retval);
+		goto register_error;
+	}
+
+	dprintk(DEBUG_NORMAL, "binding gadget driver '%s'\n",
+		driver->driver.name);
+
+	if ((retval = driver->bind (&udc->gadget)) != 0) {
+		device_del(&udc->gadget.dev);
+		goto register_error;
+	}
+
+	/* Enable udc */
+	s3c2410_udc_enable(udc);
+
+	return 0;
+
+register_error:
+	udc->driver = NULL;
+	udc->gadget.dev.driver = NULL;
+	return retval;
+}
+
+/*
+ *	usb_gadget_unregister_driver
+ */
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+	struct s3c2410_udc *udc = the_controller;
+
+	if (!udc)
+		return -ENODEV;
+
+	if (!driver || driver != udc->driver || !driver->unbind)
+		return -EINVAL;
+
+	dprintk(DEBUG_NORMAL,"usb_gadget_register_driver() '%s'\n",
+		driver->driver.name);
+
+	if (driver->disconnect)
+		driver->disconnect(&udc->gadget);
+
+	device_del(&udc->gadget.dev);
+	udc->driver = NULL;
+
+	/* Disable udc */
+	s3c2410_udc_disable(udc);
+
+	return 0;
+}
+
+/*---------------------------------------------------------------------------*/
+static struct s3c2410_udc memory = {
+	.gadget = {
+		.ops		= &s3c2410_ops,
+		.ep0		= &memory.ep[0].ep,
+		.name		= gadget_name,
+		.dev = {
+			.bus_id		= "gadget",
+		},
+	},
+
+	/* control endpoint */
+	.ep[0] = {
+		.num		= 0,
+		.ep = {
+			.name		= ep0name,
+			.ops		= &s3c2410_ep_ops,
+			.maxpacket	= EP0_FIFO_SIZE,
+		},
+		.dev		= &memory,
+	},
+
+	/* first group of endpoints */
+	.ep[1] = {
+		.num		= 1,
+		.ep = {
+			.name		= "ep1-bulk",
+			.ops		= &s3c2410_ep_ops,
+			.maxpacket	= EP_FIFO_SIZE,
+		},
+		.dev		= &memory,
+		.fifo_size	= EP_FIFO_SIZE,
+		.bEndpointAddress = 1,
+		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
+	},
+	.ep[2] = {
+		.num		= 2,
+		.ep = {
+			.name		= "ep2-bulk",
+			.ops		= &s3c2410_ep_ops,
+			.maxpacket	= EP_FIFO_SIZE,
+		},
+		.dev		= &memory,
+		.fifo_size	= EP_FIFO_SIZE,
+		.bEndpointAddress = 2,
+		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
+	},
+	.ep[3] = {
+		.num		= 3,
+		.ep = {
+			.name		= "ep3-bulk",
+			.ops		= &s3c2410_ep_ops,
+			.maxpacket	= EP_FIFO_SIZE,
+		},
+		.dev		= &memory,
+		.fifo_size	= EP_FIFO_SIZE,
+		.bEndpointAddress = 3,
+		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
+	},
+	.ep[4] = {
+		.num		= 4,
+		.ep = {
+			.name		= "ep4-bulk",
+			.ops		= &s3c2410_ep_ops,
+			.maxpacket	= EP_FIFO_SIZE,
+		},
+		.dev		= &memory,
+		.fifo_size	= EP_FIFO_SIZE,
+		.bEndpointAddress = 4,
+		.bmAttributes	= USB_ENDPOINT_XFER_BULK,
+	}
+
+};
+
+/*
+ *	probe - binds to the platform device
+ */
+static int s3c2410_udc_probe(struct platform_device *pdev)
+{
+	struct s3c2410_udc *udc = &memory;
+	struct device *dev = &pdev->dev;
+	int retval;
+	unsigned int irq;
+
+	dev_dbg(dev, "%s()\n", __func__);
+
+	usb_bus_clock = clk_get(NULL, "usb-bus-gadget");
+	if (IS_ERR(usb_bus_clock)) {
+		dev_err(dev, "failed to get usb bus clock source\n");
+		return PTR_ERR(usb_bus_clock);
+	}
+
+	clk_enable(usb_bus_clock);
+
+	udc_clock = clk_get(NULL, "usb-device");
+	if (IS_ERR(udc_clock)) {
+		dev_err(dev, "failed to get udc clock source\n");
+		return PTR_ERR(udc_clock);
+	}
+
+	clk_enable(udc_clock);
+
+	mdelay(10);
+
+	dev_dbg(dev, "got and enabled clocks\n");
+
+	if (strncmp(pdev->name, "s3c2440", 7) == 0) {
+		dev_info(dev, "S3C2440: increasing FIFO to 128 bytes\n");
+		memory.ep[1].fifo_size = S3C2440_EP_FIFO_SIZE;
+		memory.ep[2].fifo_size = S3C2440_EP_FIFO_SIZE;
+		memory.ep[3].fifo_size = S3C2440_EP_FIFO_SIZE;
+		memory.ep[4].fifo_size = S3C2440_EP_FIFO_SIZE;
+	}
+
+	spin_lock_init (&udc->lock);
+	udc_info = pdev->dev.platform_data;
+
+	rsrc_start = S3C2410_PA_USBDEV;
+	rsrc_len   = S3C24XX_SZ_USBDEV;
+
+	if (!request_mem_region(rsrc_start, rsrc_len, gadget_name))
+		return -EBUSY;
+
+	base_addr = ioremap(rsrc_start, rsrc_len);
+	if (!base_addr) {
+		retval = -ENOMEM;
+		goto err_mem;
+	}
+
+	device_initialize(&udc->gadget.dev);
+	udc->gadget.dev.parent = &pdev->dev;
+	udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
+
+	the_controller = udc;
+	platform_set_drvdata(pdev, udc);
+
+	s3c2410_udc_disable(udc);
+	s3c2410_udc_reinit(udc);
+
+	/* irq setup after old hardware state is cleaned up */
+	retval = request_irq(IRQ_USBD, s3c2410_udc_irq,
+			IRQF_DISABLED, gadget_name, udc);
+
+	if (retval != 0) {
+		dev_err(dev, "cannot get irq %i, err %d\n", IRQ_USBD, retval);
+		retval = -EBUSY;
+		goto err_map;
+	}
+
+	dev_dbg(dev, "got irq %i\n", IRQ_USBD);
+
+	if (udc_info && udc_info->vbus_pin > 0) {
+		irq = s3c2410_gpio_getirq(udc_info->vbus_pin);
+		retval = request_irq(irq, s3c2410_udc_vbus_irq,
+				IRQF_DISABLED | IRQF_TRIGGER_RISING
+				| IRQF_TRIGGER_FALLING,
+				gadget_name, udc);
+
+		if (retval != 0) {
+			dev_err(dev, "can't get vbus irq %i, err %d\n",
+				irq, retval);
+			retval = -EBUSY;
+			goto err_int;
+		}
+
+		dev_dbg(dev, "got irq %i\n", irq);
+	} else {
+		udc->vbus = 1;
+	}
+
+	if (s3c2410_udc_debugfs_root) {
+		udc->regs_info = debugfs_create_file("registers", S_IRUGO,
+				s3c2410_udc_debugfs_root,
+				udc, &s3c2410_udc_debugfs_fops);
+		if (IS_ERR(udc->regs_info)) {
+			dev_warn(dev, "debugfs file creation failed %ld\n",
+				 PTR_ERR(udc->regs_info));
+			udc->regs_info = NULL;
+		}
+	}
+
+	dev_dbg(dev, "probe ok\n");
+
+	return 0;
+
+err_int:
+	free_irq(IRQ_USBD, udc);
+err_map:
+	iounmap(base_addr);
+err_mem:
+	release_mem_region(rsrc_start, rsrc_len);
+
+	return retval;
+}
+
+/*
+ *	s3c2410_udc_remove
+ */
+static int s3c2410_udc_remove(struct platform_device *pdev)
+{
+	struct s3c2410_udc *udc = platform_get_drvdata(pdev);
+	unsigned int irq;
+
+	dev_dbg(&pdev->dev, "%s()\n", __func__);
+	if (udc->driver)
+		return -EBUSY;
+
+	debugfs_remove(udc->regs_info);
+
+	if (udc_info && udc_info->vbus_pin > 0) {
+		irq = s3c2410_gpio_getirq(udc_info->vbus_pin);
+		free_irq(irq, udc);
+	}
+
+	free_irq(IRQ_USBD, udc);
+
+	iounmap(base_addr);
+	release_mem_region(rsrc_start, rsrc_len);
+
+	platform_set_drvdata(pdev, NULL);
+
+	if (!IS_ERR(udc_clock) && udc_clock != NULL) {
+		clk_disable(udc_clock);
+		clk_put(udc_clock);
+		udc_clock = NULL;
+	}
+
+	if (!IS_ERR(usb_bus_clock) && usb_bus_clock != NULL) {
+		clk_disable(usb_bus_clock);
+		clk_put(usb_bus_clock);
+		usb_bus_clock = NULL;
+	}
+
+	dev_dbg(&pdev->dev, "%s: remove ok\n", __func__);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int s3c2410_udc_suspend(struct platform_device *pdev, pm_message_t message)
+{
+	if (udc_info && udc_info->udc_command)
+		udc_info->udc_command(S3C2410_UDC_P_DISABLE);
+
+	return 0;
+}
+
+static int s3c2410_udc_resume(struct platform_device *pdev)
+{
+	if (udc_info && udc_info->udc_command)
+		udc_info->udc_command(S3C2410_UDC_P_ENABLE);
+
+	return 0;
+}
+#else
+#define s3c2410_udc_suspend	NULL
+#define s3c2410_udc_resume	NULL
+#endif
+
+static struct platform_driver udc_driver_2410 = {
+	.driver		= {
+		.name	= "s3c2410-usbgadget",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= s3c2410_udc_probe,
+	.remove		= s3c2410_udc_remove,
+	.suspend	= s3c2410_udc_suspend,
+	.resume		= s3c2410_udc_resume,
+};
+
+static struct platform_driver udc_driver_2440 = {
+	.driver		= {
+		.name	= "s3c2440-usbgadget",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= s3c2410_udc_probe,
+	.remove		= s3c2410_udc_remove,
+	.suspend	= s3c2410_udc_suspend,
+	.resume		= s3c2410_udc_resume,
+};
+
+static int __init udc_init(void)
+{
+	int retval;
+
+	dprintk(DEBUG_NORMAL, "%s: version %s\n", gadget_name, DRIVER_VERSION);
+
+	s3c2410_udc_debugfs_root = debugfs_create_dir(gadget_name, NULL);
+	if (IS_ERR(s3c2410_udc_debugfs_root)) {
+		printk(KERN_ERR "%s: debugfs dir creation failed %ld\n",
+			gadget_name, PTR_ERR(s3c2410_udc_debugfs_root));
+		s3c2410_udc_debugfs_root = NULL;
+	}
+
+	retval = platform_driver_register(&udc_driver_2410);
+	if (retval)
+		goto err;
+
+	retval = platform_driver_register(&udc_driver_2440);
+	if (retval)
+		goto err;
+
+	return 0;
+
+err:
+	debugfs_remove(s3c2410_udc_debugfs_root);
+	return retval;
+}
+
+static void __exit udc_exit(void)
+{
+	platform_driver_unregister(&udc_driver_2410);
+	platform_driver_unregister(&udc_driver_2440);
+	debugfs_remove(s3c2410_udc_debugfs_root);
+}
+
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+module_init(udc_init);
+module_exit(udc_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");

drivers/usb/gadget/s3c2410_udc.h

+/*
+ * linux/drivers/usb/gadget/s3c2410_udc.h
+ * Samsung on-chip full speed USB device controllers
+ *
+ * Copyright (C) 2004-2007 Herbert Ptzl - Arnaud Patard
+ *	Additional cleanups by Ben Dooks <ben-linux@fluff.org>
+ *
+ * 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
+ *
+ */
+
+#ifndef _S3C2410_UDC_H
+#define _S3C2410_UDC_H
+
+struct s3c2410_ep {
+	struct list_head		queue;
+	unsigned long			last_io;	/* jiffies timestamp */
+	struct usb_gadget		*gadget;
+	struct s3c2410_udc		*dev;
+	const struct usb_endpoint_descriptor *desc;
+	struct usb_ep			ep;
+	u8				num;
+
+	unsigned short			fifo_size;
+	u8				bEndpointAddress;
+	u8				bmAttributes;
+
+	unsigned			halted : 1;
+	unsigned			already_seen : 1;
+	unsigned			setup_stage : 1;
+};
+
+
+/* Warning : ep0 has a fifo of 16 bytes */
+/* Don't try to set 32 or 64            */
+/* also testusb 14 fails  wit 16 but is */
+/* fine with 8                          */
+#define EP0_FIFO_SIZE		 8
+#define EP_FIFO_SIZE		64
+#define DEFAULT_POWER_STATE	0x00
+
+#define S3C2440_EP_FIFO_SIZE	128
+
+static const char ep0name [] = "ep0";
+
+static const char *const ep_name[] = {
+	ep0name,                                /* everyone has ep0 */
+	/* s3c2410 four bidirectional bulk endpoints */
+	"ep1-bulk", "ep2-bulk", "ep3-bulk", "ep4-bulk",
+};
+
+#define S3C2410_ENDPOINTS       ARRAY_SIZE(ep_name)
+
+struct s3c2410_request {
+	struct list_head		queue;		/* ep's requests */
+	struct usb_request		req;
+};
+
+enum ep0_state {
+        EP0_IDLE,
+        EP0_IN_DATA_PHASE,
+        EP0_OUT_DATA_PHASE,
+        EP0_END_XFER,
+        EP0_STALL,
+};
+
+static const char *ep0states[]= {
+        "EP0_IDLE",
+        "EP0_IN_DATA_PHASE",
+        "EP0_OUT_DATA_PHASE",
+        "EP0_END_XFER",
+        "EP0_STALL",
+};
+
+struct s3c2410_udc {
+	spinlock_t			lock;
+
+	struct s3c2410_ep		ep[S3C2410_ENDPOINTS];
+	int				address;
+	struct usb_gadget		gadget;
+	struct usb_gadget_driver	*driver;
+	struct s3c2410_request		fifo_req;
+	u8				fifo_buf[EP_FIFO_SIZE];
+	u16				devstatus;
+
+	u32				port_status;
+	int				ep0state;
+
+	unsigned			got_irq : 1;
+
+	unsigned			req_std : 1;
+	unsigned			req_config : 1;
+	unsigned			req_pending : 1;
+	u8				vbus;
+	struct dentry			*regs_info;
+};
+
+#endif