usb: gadget: R8A66597 peripheral controller support.

While in-tree support for the R8A66597 host side has been supported for
some time, the peripheral side has so far been unsupported. This adds a
new USB gadget driver which bridges the gap and finally wires up the
peripheral side as well.

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Tested-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

5 files changed, 1911 insertions, 0 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index b7f10bc25c2..9f986b417c5 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -251,6 +251,24 @@ config USB_PXA25X_SMALL
 	default y if USB_ETH
 	default y if USB_G_SERIAL
 
+config USB_GADGET_R8A66597
+	boolean "Renesas R8A66597 USB Peripheral Controller"
+	select USB_GADGET_DUALSPEED
+	help
+	   R8A66597 is a discrete USB host and peripheral controller chip that
+	   supports both full and high speed USB 2.0 data transfers.
+	   It has nine configurable endpoints, and endpoint zero.
+
+	   Say "y" to link the driver statically, or "m" to build a
+	   dynamically linked module called "r8a66597_udc" and force all
+	   gadget drivers to also be dynamically linked.
+
+config USB_R8A66597
+	tristate
+	depends on USB_GADGET_R8A66597
+	default USB_GADGET
+	select USB_GADGET_SELECTED
+
 config USB_GADGET_PXA27X
 	boolean "PXA 27x"
 	depends on ARCH_PXA && (PXA27x || PXA3xx)
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index e6017e6bf6d..9d7b87c52e9 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -23,6 +23,7 @@ ifeq ($(CONFIG_ARCH_MXC),y)
 fsl_usb2_udc-objs		+= fsl_mx3_udc.o
 endif
 obj-$(CONFIG_USB_M66592)	+= m66592-udc.o
+obj-$(CONFIG_USB_R8A66597)	+= r8a66597-udc.o
 obj-$(CONFIG_USB_FSL_QE)	+= fsl_qe_udc.o
 obj-$(CONFIG_USB_CI13XXX)	+= ci13xxx_udc.o
 obj-$(CONFIG_USB_S3C_HSOTG)	+= s3c-hsotg.o
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index 8e0e9a0b736..f2d270b202f 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -173,6 +173,12 @@
 // CONFIG_USB_GADGET_AU1X00
 // ...
 
+#ifdef CONFIG_USB_GADGET_R8A66597
+#define	gadget_is_r8a66597(g)	!strcmp("r8a66597_udc", (g)->name)
+#else
+#define	gadget_is_r8a66597(g)	0
+#endif
+
 
 /**
  * usb_gadget_controller_number - support bcdDevice id convention
@@ -239,6 +245,8 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
 		return 0x23;
 	else if (gadget_is_langwell(gadget))
 		return 0x24;
+	else if (gadget_is_r8a66597(gadget))
+		return 0x25;
 	return -ENOENT;
 }
 
diff --git a/drivers/usb/gadget/r8a66597-udc.c b/drivers/usb/gadget/r8a66597-udc.c
new file mode 100644
index 00000000000..cc0ba68efa5
--- /dev/null
+++ b/drivers/usb/gadget/r8a66597-udc.c
@@ -0,0 +1,1635 @@
+/*
+ * R8A66597 UDC (USB gadget)
+ *
+ * Copyright (C) 2006-2009 Renesas Solutions Corp.
+ *
+ * Author : Yoshihiro Shimoda <shimoda.yoshihiro@renesas.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; version 2 of the License.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+#include "r8a66597-udc.h"
+
+#define DRIVER_VERSION	"2009-08-18"
+
+static const char udc_name[] = "r8a66597_udc";
+static const char *r8a66597_ep_name[] = {
+	"ep0", "ep1", "ep2", "ep3", "ep4", "ep5", "ep6", "ep7",
+	"ep8", "ep9",
+};
+
+static void disable_controller(struct r8a66597 *r8a66597);
+static void irq_ep0_write(struct r8a66597_ep *ep, struct r8a66597_request *req);
+static void irq_packet_write(struct r8a66597_ep *ep,
+				struct r8a66597_request *req);
+static int r8a66597_queue(struct usb_ep *_ep, struct usb_request *_req,
+			gfp_t gfp_flags);
+
+static void transfer_complete(struct r8a66597_ep *ep,
+		struct r8a66597_request *req, int status);
+
+/*-------------------------------------------------------------------------*/
+static inline u16 get_usb_speed(struct r8a66597 *r8a66597)
+{
+	return r8a66597_read(r8a66597, DVSTCTR0) & RHST;
+}
+
+static void enable_pipe_irq(struct r8a66597 *r8a66597, u16 pipenum,
+		unsigned long reg)
+{
+	u16 tmp;
+
+	tmp = r8a66597_read(r8a66597, INTENB0);
+	r8a66597_bclr(r8a66597, BEMPE | NRDYE | BRDYE,
+			INTENB0);
+	r8a66597_bset(r8a66597, (1 << pipenum), reg);
+	r8a66597_write(r8a66597, tmp, INTENB0);
+}
+
+static void disable_pipe_irq(struct r8a66597 *r8a66597, u16 pipenum,
+		unsigned long reg)
+{
+	u16 tmp;
+
+	tmp = r8a66597_read(r8a66597, INTENB0);
+	r8a66597_bclr(r8a66597, BEMPE | NRDYE | BRDYE,
+			INTENB0);
+	r8a66597_bclr(r8a66597, (1 << pipenum), reg);
+	r8a66597_write(r8a66597, tmp, INTENB0);
+}
+
+static void r8a66597_usb_connect(struct r8a66597 *r8a66597)
+{
+	r8a66597_bset(r8a66597, CTRE, INTENB0);
+	r8a66597_bset(r8a66597, BEMPE | BRDYE, INTENB0);
+
+	r8a66597_bset(r8a66597, DPRPU, SYSCFG0);
+}
+
+static void r8a66597_usb_disconnect(struct r8a66597 *r8a66597)
+__releases(r8a66597->lock)
+__acquires(r8a66597->lock)
+{
+	r8a66597_bclr(r8a66597, CTRE, INTENB0);
+	r8a66597_bclr(r8a66597, BEMPE | BRDYE, INTENB0);
+	r8a66597_bclr(r8a66597, DPRPU, SYSCFG0);
+
+	r8a66597->gadget.speed = USB_SPEED_UNKNOWN;
+	spin_unlock(&r8a66597->lock);
+	r8a66597->driver->disconnect(&r8a66597->gadget);
+	spin_lock(&r8a66597->lock);
+
+	disable_controller(r8a66597);
+	INIT_LIST_HEAD(&r8a66597->ep[0].queue);
+}
+
+static inline u16 control_reg_get_pid(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	u16 pid = 0;
+	unsigned long offset;
+
+	if (pipenum == 0)
+		pid = r8a66597_read(r8a66597, DCPCTR) & PID;
+	else if (pipenum < R8A66597_MAX_NUM_PIPE) {
+		offset = get_pipectr_addr(pipenum);
+		pid = r8a66597_read(r8a66597, offset) & PID;
+	} else
+		printk(KERN_ERR "unexpect pipe num (%d)\n", pipenum);
+
+	return pid;
+}
+
+static inline void control_reg_set_pid(struct r8a66597 *r8a66597, u16 pipenum,
+		u16 pid)
+{
+	unsigned long offset;
+
+	if (pipenum == 0)
+		r8a66597_mdfy(r8a66597, pid, PID, DCPCTR);
+	else if (pipenum < R8A66597_MAX_NUM_PIPE) {
+		offset = get_pipectr_addr(pipenum);
+		r8a66597_mdfy(r8a66597, pid, PID, offset);
+	} else
+		printk(KERN_ERR "unexpect pipe num (%d)\n", pipenum);
+}
+
+static inline void pipe_start(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	control_reg_set_pid(r8a66597, pipenum, PID_BUF);
+}
+
+static inline void pipe_stop(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	control_reg_set_pid(r8a66597, pipenum, PID_NAK);
+}
+
+static inline void pipe_stall(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	control_reg_set_pid(r8a66597, pipenum, PID_STALL);
+}
+
+static inline u16 control_reg_get(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	u16 ret = 0;
+	unsigned long offset;
+
+	if (pipenum == 0)
+		ret = r8a66597_read(r8a66597, DCPCTR);
+	else if (pipenum < R8A66597_MAX_NUM_PIPE) {
+		offset = get_pipectr_addr(pipenum);
+		ret = r8a66597_read(r8a66597, offset);
+	} else
+		printk(KERN_ERR "unexpect pipe num (%d)\n", pipenum);
+
+	return ret;
+}
+
+static inline void control_reg_sqclr(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	unsigned long offset;
+
+	pipe_stop(r8a66597, pipenum);
+
+	if (pipenum == 0)
+		r8a66597_bset(r8a66597, SQCLR, DCPCTR);
+	else if (pipenum < R8A66597_MAX_NUM_PIPE) {
+		offset = get_pipectr_addr(pipenum);
+		r8a66597_bset(r8a66597, SQCLR, offset);
+	} else
+		printk(KERN_ERR "unexpect pipe num(%d)\n", pipenum);
+}
+
+static inline int get_buffer_size(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	u16 tmp;
+	int size;
+
+	if (pipenum == 0) {
+		tmp = r8a66597_read(r8a66597, DCPCFG);
+		if ((tmp & R8A66597_CNTMD) != 0)
+			size = 256;
+		else {
+			tmp = r8a66597_read(r8a66597, DCPMAXP);
+			size = tmp & MAXP;
+		}
+	} else {
+		r8a66597_write(r8a66597, pipenum, PIPESEL);
+		tmp = r8a66597_read(r8a66597, PIPECFG);
+		if ((tmp & R8A66597_CNTMD) != 0) {
+			tmp = r8a66597_read(r8a66597, PIPEBUF);
+			size = ((tmp >> 10) + 1) * 64;
+		} else {
+			tmp = r8a66597_read(r8a66597, PIPEMAXP);
+			size = tmp & MXPS;
+		}
+	}
+
+	return size;
+}
+
+static inline unsigned short mbw_value(struct r8a66597 *r8a66597)
+{
+	if (r8a66597->pdata->on_chip)
+		return MBW_32;
+	else
+		return MBW_16;
+}
+
+static inline void pipe_change(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	struct r8a66597_ep *ep = r8a66597->pipenum2ep[pipenum];
+
+	if (ep->use_dma)
+		return;
+
+	r8a66597_mdfy(r8a66597, pipenum, CURPIPE, ep->fifosel);
+
+	ndelay(450);
+
+	r8a66597_bset(r8a66597, mbw_value(r8a66597), ep->fifosel);
+}
+
+static int pipe_buffer_setting(struct r8a66597 *r8a66597,
+		struct r8a66597_pipe_info *info)
+{
+	u16 bufnum = 0, buf_bsize = 0;
+	u16 pipecfg = 0;
+
+	if (info->pipe == 0)
+		return -EINVAL;
+
+	r8a66597_write(r8a66597, info->pipe, PIPESEL);
+
+	if (info->dir_in)
+		pipecfg |= R8A66597_DIR;
+	pipecfg |= info->type;
+	pipecfg |= info->epnum;
+	switch (info->type) {
+	case R8A66597_INT:
+		bufnum = 4 + (info->pipe - R8A66597_BASE_PIPENUM_INT);
+		buf_bsize = 0;
+		break;
+	case R8A66597_BULK:
+		bufnum = r8a66597->bi_bufnum +
+			 (info->pipe - R8A66597_BASE_PIPENUM_BULK) * 16;
+		r8a66597->bi_bufnum += 16;
+		buf_bsize = 7;
+		pipecfg |= R8A66597_DBLB;
+		if (!info->dir_in)
+			pipecfg |= R8A66597_SHTNAK;
+		break;
+	case R8A66597_ISO:
+		bufnum = r8a66597->bi_bufnum +
+			 (info->pipe - R8A66597_BASE_PIPENUM_ISOC) * 16;
+		r8a66597->bi_bufnum += 16;
+		buf_bsize = 7;
+		break;
+	}
+	if (r8a66597->bi_bufnum > R8A66597_MAX_BUFNUM) {
+		printk(KERN_ERR "r8a66597 pipe memory is insufficient(%d)\n",
+				r8a66597->bi_bufnum);
+		return -ENOMEM;
+	}
+
+	r8a66597_write(r8a66597, pipecfg, PIPECFG);
+	r8a66597_write(r8a66597, (buf_bsize << 10) | (bufnum), PIPEBUF);
+	r8a66597_write(r8a66597, info->maxpacket, PIPEMAXP);
+	if (info->interval)
+		info->interval--;
+	r8a66597_write(r8a66597, info->interval, PIPEPERI);
+
+	return 0;
+}
+
+static void pipe_buffer_release(struct r8a66597 *r8a66597,
+				struct r8a66597_pipe_info *info)
+{
+	if (info->pipe == 0)
+		return;
+
+	switch (info->type) {
+	case R8A66597_BULK:
+		if (is_bulk_pipe(info->pipe))
+			r8a66597->bi_bufnum -= 16;
+		break;
+	case R8A66597_ISO:
+		if (is_isoc_pipe(info->pipe))
+			r8a66597->bi_bufnum -= 16;
+		break;
+	}
+
+	if (is_bulk_pipe(info->pipe))
+		r8a66597->bulk--;
+	else if (is_interrupt_pipe(info->pipe))
+		r8a66597->interrupt--;
+	else if (is_isoc_pipe(info->pipe)) {
+		r8a66597->isochronous--;
+		if (info->type == R8A66597_BULK)
+			r8a66597->bulk--;
+	} else
+		printk(KERN_ERR "ep_release: unexpect pipenum (%d)\n",
+				info->pipe);
+}
+
+static void pipe_initialize(struct r8a66597_ep *ep)
+{
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+
+	r8a66597_mdfy(r8a66597, 0, CURPIPE, ep->fifosel);
+
+	r8a66597_write(r8a66597, ACLRM, ep->pipectr);
+	r8a66597_write(r8a66597, 0, ep->pipectr);
+	r8a66597_write(r8a66597, SQCLR, ep->pipectr);
+	if (ep->use_dma) {
+		r8a66597_mdfy(r8a66597, ep->pipenum, CURPIPE, ep->fifosel);
+
+		ndelay(450);
+
+		r8a66597_bset(r8a66597, mbw_value(r8a66597), ep->fifosel);
+	}
+}
+
+static void r8a66597_ep_setting(struct r8a66597 *r8a66597,
+				struct r8a66597_ep *ep,
+				const struct usb_endpoint_descriptor *desc,
+				u16 pipenum, int dma)
+{
+	ep->use_dma = 0;
+	ep->fifoaddr = CFIFO;
+	ep->fifosel = CFIFOSEL;
+	ep->fifoctr = CFIFOCTR;
+	ep->fifotrn = 0;
+
+	ep->pipectr = get_pipectr_addr(pipenum);
+	ep->pipenum = pipenum;
+	ep->ep.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
+	r8a66597->pipenum2ep[pipenum] = ep;
+	r8a66597->epaddr2ep[desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK]
+		= ep;
+	INIT_LIST_HEAD(&ep->queue);
+}
+
+static void r8a66597_ep_release(struct r8a66597_ep *ep)
+{
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+	u16 pipenum = ep->pipenum;
+
+	if (pipenum == 0)
+		return;
+
+	if (ep->use_dma)
+		r8a66597->num_dma--;
+	ep->pipenum = 0;
+	ep->busy = 0;
+	ep->use_dma = 0;
+}
+
+static int alloc_pipe_config(struct r8a66597_ep *ep,
+		const struct usb_endpoint_descriptor *desc)
+{
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+	struct r8a66597_pipe_info info;
+	int dma = 0;
+	unsigned char *counter;
+	int ret;
+
+	ep->desc = desc;
+
+	if (ep->pipenum)	/* already allocated pipe  */
+		return 0;
+
+	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	case USB_ENDPOINT_XFER_BULK:
+		if (r8a66597->bulk >= R8A66597_MAX_NUM_BULK) {
+			if (r8a66597->isochronous >= R8A66597_MAX_NUM_ISOC) {
+				printk(KERN_ERR "bulk pipe is insufficient\n");
+				return -ENODEV;
+			} else {
+				info.pipe = R8A66597_BASE_PIPENUM_ISOC
+						+ r8a66597->isochronous;
+				counter = &r8a66597->isochronous;
+			}
+		} else {
+			info.pipe = R8A66597_BASE_PIPENUM_BULK + r8a66597->bulk;
+			counter = &r8a66597->bulk;
+		}
+		info.type = R8A66597_BULK;
+		dma = 1;
+		break;
+	case USB_ENDPOINT_XFER_INT:
+		if (r8a66597->interrupt >= R8A66597_MAX_NUM_INT) {
+			printk(KERN_ERR "interrupt pipe is insufficient\n");
+			return -ENODEV;
+		}
+		info.pipe = R8A66597_BASE_PIPENUM_INT + r8a66597->interrupt;
+		info.type = R8A66597_INT;
+		counter = &r8a66597->interrupt;
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		if (r8a66597->isochronous >= R8A66597_MAX_NUM_ISOC) {
+			printk(KERN_ERR "isochronous pipe is insufficient\n");
+			return -ENODEV;
+		}
+		info.pipe = R8A66597_BASE_PIPENUM_ISOC + r8a66597->isochronous;
+		info.type = R8A66597_ISO;
+		counter = &r8a66597->isochronous;
+		break;
+	default:
+		printk(KERN_ERR "unexpect xfer type\n");
+		return -EINVAL;
+	}
+	ep->type = info.type;
+
+	info.epnum = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+	info.maxpacket = le16_to_cpu(desc->wMaxPacketSize);
+	info.interval = desc->bInterval;
+	if (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
+		info.dir_in = 1;
+	else
+		info.dir_in = 0;
+
+	ret = pipe_buffer_setting(r8a66597, &info);
+	if (ret < 0) {
+		printk(KERN_ERR "pipe_buffer_setting fail\n");
+		return ret;
+	}
+
+	(*counter)++;
+	if ((counter == &r8a66597->isochronous) && info.type == R8A66597_BULK)
+		r8a66597->bulk++;
+
+	r8a66597_ep_setting(r8a66597, ep, desc, info.pipe, dma);
+	pipe_initialize(ep);
+
+	return 0;
+}
+
+static int free_pipe_config(struct r8a66597_ep *ep)
+{
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+	struct r8a66597_pipe_info info;
+
+	info.pipe = ep->pipenum;
+	info.type = ep->type;
+	pipe_buffer_release(r8a66597, &info);
+	r8a66597_ep_release(ep);
+
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+static void pipe_irq_enable(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	enable_irq_ready(r8a66597, pipenum);
+	enable_irq_nrdy(r8a66597, pipenum);
+}
+
+static void pipe_irq_disable(struct r8a66597 *r8a66597, u16 pipenum)
+{
+	disable_irq_ready(r8a66597, pipenum);
+	disable_irq_nrdy(r8a66597, pipenum);
+}
+
+/* if complete is true, gadget driver complete function is not call */
+static void control_end(struct r8a66597 *r8a66597, unsigned ccpl)
+{
+	r8a66597->ep[0].internal_ccpl = ccpl;
+	pipe_start(r8a66597, 0);
+	r8a66597_bset(r8a66597, CCPL, DCPCTR);
+}
+
+static void start_ep0_write(struct r8a66597_ep *ep,
+				struct r8a66597_request *req)
+{
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+
+	pipe_change(r8a66597, ep->pipenum);
+	r8a66597_mdfy(r8a66597, ISEL, (ISEL | CURPIPE), CFIFOSEL);
+	r8a66597_write(r8a66597, BCLR, ep->fifoctr);
+	if (req->req.length == 0) {
+		r8a66597_bset(r8a66597, BVAL, ep->fifoctr);
+		pipe_start(r8a66597, 0);
+		transfer_complete(ep, req, 0);
+	} else {
+		r8a66597_write(r8a66597, ~BEMP0, BEMPSTS);
+		irq_ep0_write(ep, req);
+	}
+}
+
+static void start_packet_write(struct r8a66597_ep *ep,
+				struct r8a66597_request *req)
+{
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+	u16 tmp;
+
+	pipe_change(r8a66597, ep->pipenum);
+	disable_irq_empty(r8a66597, ep->pipenum);
+	pipe_start(r8a66597, ep->pipenum);
+
+	tmp = r8a66597_read(r8a66597, ep->fifoctr);
+	if (unlikely((tmp & FRDY) == 0))
+		pipe_irq_enable(r8a66597, ep->pipenum);
+	else
+		irq_packet_write(ep, req);
+}
+
+static void start_packet_read(struct r8a66597_ep *ep,
+				struct r8a66597_request *req)
+{
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+	u16 pipenum = ep->pipenum;
+
+	if (ep->pipenum == 0) {
+		r8a66597_mdfy(r8a66597, 0, (ISEL | CURPIPE), CFIFOSEL);
+		r8a66597_write(r8a66597, BCLR, ep->fifoctr);
+		pipe_start(r8a66597, pipenum);
+		pipe_irq_enable(r8a66597, pipenum);
+	} else {
+		if (ep->use_dma) {
+			r8a66597_bset(r8a66597, TRCLR, ep->fifosel);
+			pipe_change(r8a66597, pipenum);
+			r8a66597_bset(r8a66597, TRENB, ep->fifosel);
+			r8a66597_write(r8a66597,
+				(req->req.length + ep->ep.maxpacket - 1)
+					/ ep->ep.maxpacket,
+				ep->fifotrn);
+		}
+		pipe_start(r8a66597, pipenum);	/* trigger once */
+		pipe_irq_enable(r8a66597, pipenum);
+	}
+}
+
+static void start_packet(struct r8a66597_ep *ep, struct r8a66597_request *req)
+{
+	if (ep->desc->bEndpointAddress & USB_DIR_IN)
+		start_packet_write(ep, req);
+	else
+		start_packet_read(ep, req);
+}
+
+static void start_ep0(struct r8a66597_ep *ep, struct r8a66597_request *req)
+{
+	u16 ctsq;
+
+	ctsq = r8a66597_read(ep->r8a66597, INTSTS0) & CTSQ;
+
+	switch (ctsq) {
+	case CS_RDDS:
+		start_ep0_write(ep, req);
+		break;
+	case CS_WRDS:
+		start_packet_read(ep, req);
+		break;
+
+	case CS_WRND:
+		control_end(ep->r8a66597, 0);
+		break;
+	default:
+		printk(KERN_ERR "start_ep0: unexpect ctsq(%x)\n", ctsq);
+		break;
+	}
+}
+
+static void init_controller(struct r8a66597 *r8a66597)
+{
+	u16 vif = r8a66597->pdata->vif ? LDRV : 0;
+	u16 irq_sense = r8a66597->irq_sense_low ? INTL : 0;
+	u16 endian = r8a66597->pdata->endian ? BIGEND : 0;
+
+	if (r8a66597->pdata->on_chip) {
+		r8a66597_bset(r8a66597, 0x04, SYSCFG1);
+		r8a66597_bset(r8a66597, HSE, SYSCFG0);
+
+		r8a66597_bclr(r8a66597, USBE, SYSCFG0);
+		r8a66597_bclr(r8a66597, DPRPU, SYSCFG0);
+		r8a66597_bset(r8a66597, USBE, SYSCFG0);
+
+		r8a66597_bset(r8a66597, SCKE, SYSCFG0);
+
+		r8a66597_bset(r8a66597, irq_sense, INTENB1);
+		r8a66597_write(r8a66597, BURST | CPU_ADR_RD_WR,
+				DMA0CFG);
+	} else {
+		r8a66597_bset(r8a66597, vif | endian, PINCFG);
+		r8a66597_bset(r8a66597, HSE, SYSCFG0);		/* High spd */
+		r8a66597_mdfy(r8a66597, get_xtal_from_pdata(r8a66597->pdata),
+				XTAL, SYSCFG0);
+
+		r8a66597_bclr(r8a66597, USBE, SYSCFG0);
+		r8a66597_bclr(r8a66597, DPRPU, SYSCFG0);
+		r8a66597_bset(r8a66597, USBE, SYSCFG0);
+
+		r8a66597_bset(r8a66597, XCKE, SYSCFG0);
+
+		msleep(3);
+
+		r8a66597_bset(r8a66597, PLLC, SYSCFG0);
+
+		msleep(1);
+
+		r8a66597_bset(r8a66597, SCKE, SYSCFG0);
+
+		r8a66597_bset(r8a66597, irq_sense, INTENB1);
+		r8a66597_write(r8a66597, BURST | CPU_ADR_RD_WR,
+			       DMA0CFG);
+	}
+}
+
+static void disable_controller(struct r8a66597 *r8a66597)
+{
+	if (r8a66597->pdata->on_chip) {
+		r8a66597_bset(r8a66597, SCKE, SYSCFG0);
+
+		r8a66597_write(r8a66597, 0, INTENB0);
+		r8a66597_write(r8a66597, 0, INTENB1);
+
+		r8a66597_bclr(r8a66597, USBE, SYSCFG0);
+		r8a66597_bclr(r8a66597, SCKE, SYSCFG0);
+
+	} else {
+		r8a66597_bclr(r8a66597, SCKE, SYSCFG0);
+		udelay(1);
+		r8a66597_bclr(r8a66597, PLLC, SYSCFG0);
+		udelay(1);
+		udelay(1);
+		r8a66597_bclr(r8a66597, XCKE, SYSCFG0);
+	}
+}
+
+static void r8a66597_start_xclock(struct r8a66597 *r8a66597)
+{
+	u16 tmp;
+
+	if (!r8a66597->pdata->on_chip) {
+		tmp = r8a66597_read(r8a66597, SYSCFG0);
+		if (!(tmp & XCKE))
+			r8a66597_bset(r8a66597, XCKE, SYSCFG0);
+	}
+}
+
+static struct r8a66597_request *get_request_from_ep(struct r8a66597_ep *ep)
+{
+	return list_entry(ep->queue.next, struct r8a66597_request, queue);
+}
+
+/*-------------------------------------------------------------------------*/
+static void transfer_complete(struct r8a66597_ep *ep,
+		struct r8a66597_request *req, int status)
+__releases(r8a66597->lock)
+__acquires(r8a66597->lock)
+{
+	int restart = 0;
+
+	if (unlikely(ep->pipenum == 0)) {
+		if (ep->internal_ccpl) {
+			ep->internal_ccpl = 0;
+			return;
+		}
+	}
+
+	list_del_init(&req->queue);
+	if (ep->r8a66597->gadget.speed == USB_SPEED_UNKNOWN)
+		req->req.status = -ESHUTDOWN;
+	else
+		req->req.status = status;
+
+	if (!list_empty(&ep->queue))
+		restart = 1;
+
+	spin_unlock(&ep->r8a66597->lock);
+	req->req.complete(&ep->ep, &req->req);
+	spin_lock(&ep->r8a66597->lock);
+
+	if (restart) {
+		req = get_request_from_ep(ep);
+		if (ep->desc)
+			start_packet(ep, req);
+	}
+}
+
+static void irq_ep0_write(struct r8a66597_ep *ep, struct r8a66597_request *req)
+{
+	int i;
+	u16 tmp;
+	unsigned bufsize;
+	size_t size;
+	void *buf;
+	u16 pipenum = ep->pipenum;
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+
+	pipe_change(r8a66597, pipenum);
+	r8a66597_bset(r8a66597, ISEL, ep->fifosel);
+
+	i = 0;
+	do {
+		tmp = r8a66597_read(r8a66597, ep->fifoctr);
+		if (i++ > 100000) {
+			printk(KERN_ERR "pipe0 is busy. maybe cpu i/o bus"
+				"conflict. please power off this controller.");
+			return;
+		}
+		ndelay(1);
+	} while ((tmp & FRDY) == 0);
+
+	/* prepare parameters */
+	bufsize = get_buffer_size(r8a66597, pipenum);
+	buf = req->req.buf + req->req.actual;
+	size = min(bufsize, req->req.length - req->req.actual);
+
+	/* write fifo */
+	if (req->req.buf) {
+		if (size > 0)
+			r8a66597_write_fifo(r8a66597, ep->fifoaddr, buf, size);
+		if ((size == 0) || ((size % ep->ep.maxpacket) != 0))
+			r8a66597_bset(r8a66597, BVAL, ep->fifoctr);
+	}
+
+	/* update parameters */
+	req->req.actual += size;
+
+	/* check transfer finish */
+	if ((!req->req.zero && (req->req.actual == req->req.length))
+			|| (size % ep->ep.maxpacket)
+			|| (size == 0)) {
+		disable_irq_ready(r8a66597, pipenum);
+		disable_irq_empty(r8a66597, pipenum);
+	} else {
+		disable_irq_ready(r8a66597, pipenum);
+		enable_irq_empty(r8a66597, pipenum);
+	}
+	pipe_start(r8a66597, pipenum);
+}
+
+static void irq_packet_write(struct r8a66597_ep *ep,
+				struct r8a66597_request *req)
+{
+	u16 tmp;
+	unsigned bufsize;
+	size_t size;
+	void *buf;
+	u16 pipenum = ep->pipenum;
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+
+	pipe_change(r8a66597, pipenum);
+	tmp = r8a66597_read(r8a66597, ep->fifoctr);
+	if (unlikely((tmp & FRDY) == 0)) {
+		pipe_stop(r8a66597, pipenum);
+		pipe_irq_disable(r8a66597, pipenum);
+		printk(KERN_ERR "write fifo not ready. pipnum=%d\n", pipenum);
+		return;
+	}
+
+	/* prepare parameters */
+	bufsize = get_buffer_size(r8a66597, pipenum);
+	buf = req->req.buf + req->req.actual;
+	size = min(bufsize, req->req.length - req->req.actual);
+
+	/* write fifo */
+	if (req->req.buf) {
+		r8a66597_write_fifo(r8a66597, ep->fifoaddr, buf, size);
+		if ((size == 0)
+				|| ((size % ep->ep.maxpacket) != 0)
+				|| ((bufsize != ep->ep.maxpacket)
+					&& (bufsize > size)))
+			r8a66597_bset(r8a66597, BVAL, ep->fifoctr);
+	}
+
+	/* update parameters */
+	req->req.actual += size;
+	/* check transfer finish */
+	if ((!req->req.zero && (req->req.actual == req->req.length))
+			|| (size % ep->ep.maxpacket)
+			|| (size == 0)) {
+		disable_irq_ready(r8a66597, pipenum);
+		enable_irq_empty(r8a66597, pipenum);
+	} else {
+		disable_irq_empty(r8a66597, pipenum);
+		pipe_irq_enable(r8a66597, pipenum);
+	}
+}
+
+static void irq_packet_read(struct r8a66597_ep *ep,
+				struct r8a66597_request *req)
+{
+	u16 tmp;
+	int rcv_len, bufsize, req_len;
+	int size;
+	void *buf;
+	u16 pipenum = ep->pipenum;
+	struct r8a66597 *r8a66597 = ep->r8a66597;
+	int finish = 0;
+
+	pipe_change(r8a66597, pipenum);
+	tmp = r8a66597_read(r8a66597, ep->fifoctr);
+	if (unlikely((tmp & FRDY) == 0)) {
+		req->req.status = -EPIPE;
+		pipe_stop(r8a66597, pipenum);
+		pipe_irq_disable(r8a66597, pipenum);
+		printk(KERN_ERR "read fifo not ready");
+		return;
+	}
+
+	/* prepare parameters */
+	rcv_len = tmp & DTLN;
+	bufsize = get_buffer_size(r8a66597, pipenum);
+
+	buf = req->req.buf + req->req.actual;
+	req_len = req->req.length - req->req.actual;
+	if (rcv_len < bufsize)
+		size = min(rcv_len, req_len);
+	else
+		size = min(bufsize, req_len);
+
+	/* update parameters */
+	req->req.actual += size;
+
+	/* check transfer finish */
+	if ((!req->req.zero && (req->req.actual == req->req.length))
+			|| (size % ep->ep.maxpacket)
+			|| (size == 0)) {
+		pipe_stop(r8a66597, pipenum);
+		pipe_irq_disable(r8a66597, pipenum);
+		finish = 1;
+	}
+
+	/* read fifo */
+	if (req->req.buf) {
+		if (size == 0)
+			r8a66597_write(r8a66597, BCLR, ep->fifoctr);
+		else
+			r8a66597_read_fifo(r8a66597, ep->fifoaddr, buf, size);
+
+	}
+
+	if ((ep->pipenum != 0) && finish)
+		transfer_complete(ep, req, 0);
+}
+
+static void irq_pipe_ready(struct r8a66597 *r8a66597, u16 status, u16 enb)
+{
+	u16 check;
+	u16 pipenum;
+	struct r8a66597_ep *ep;
+	struct r8a66597_request *req;
+
+	if ((status & BRDY0) && (enb & BRDY0)) {
+		r8a66597_write(r8a66597, ~BRDY0, BRDYSTS);
+		r8a66597_mdfy(r8a66597, 0, CURPIPE, CFIFOSEL);
+
+		ep = &r8a66597->ep[0];
+		req = get_request_from_ep(ep);
+		irq_packet_read(ep, req);
+	} else {
+		for (pipenum = 1; pipenum < R8A66597_MAX_NUM_PIPE; pipenum++) {
+			check = 1 << pipenum;
+			if ((status & check) && (enb & check)) {
+				r8a66597_write(r8a66597, ~check, BRDYSTS);
+				ep = r8a66597->pipenum2ep[pipenum];
+				req = get_request_from_ep(ep);
+				if (ep->desc->bEndpointAddress & USB_DIR_IN)
+					irq_packet_write(ep, req);
+				else
+					irq_packet_read(ep, req);
+			}
+		}
+	}
+}
+
+static void irq_pipe_empty(struct r8a66597 *r8a66597, u16 status, u16 enb)
+{
+	u16 tmp;
+	u16 check;
+	u16 pipenum;
+	struct r8a66597_ep *ep;
+	struct r8a66597_request *req;
+
+	if ((status & BEMP0) && (enb & BEMP0)) {
+		r8a66597_write(r8a66597, ~BEMP0, BEMPSTS);
+
+		ep = &r8a66597->ep[0];
+		req = get_request_from_ep(ep);
+		irq_ep0_write(ep, req);
+	} else {
+		for (pipenum = 1; pipenum < R8A66597_MAX_NUM_PIPE; pipenum++) {
+			check = 1 << pipenum;
+			if ((status & check) && (enb & check)) {
+				r8a66597_write(r8a66597, ~check, BEMPSTS);
+				tmp = control_reg_get(r8a66597, pipenum);
+				if ((tmp & INBUFM) == 0) {
+					disable_irq_empty(r8a66597, pipenum);
+					pipe_irq_disable(r8a66597, pipenum);
+					pipe_stop(r8a66597, pipenum);
+					ep = r8a66597->pipenum2ep[pipenum];
+					req = get_request_from_ep(ep);
+					if (!list_empty(&ep->queue))
+						transfer_complete(ep, req, 0);
+				}
+			}
+		}
+	}
+}
+
+static void get_status(struct r8a66597 *r8a66597, struct usb_ctrlrequest *ctrl)
+__releases(r8a66597->lock)
+__acquires(r8a66597->lock)
+{
+	struct r8a66597_ep *ep;
+	u16 pid;
+	u16 status = 0;
+	u16 w_index = le16_to_cpu(ctrl->wIndex);
+
+	switch (ctrl->bRequestType & USB_RECIP_MASK) {
+	case USB_RECIP_DEVICE:
+		status = 1 << USB_DEVICE_SELF_POWERED;
+		break;
+	case USB_RECIP_INTERFACE:
+		status = 0;
+		break;
+	case USB_RECIP_ENDPOINT:
+		ep = r8a66597->epaddr2ep[w_index & USB_ENDPOINT_NUMBER_MASK];
+		pid = control_reg_get_pid(r8a66597, ep->pipenum);
+		if (pid == PID_STALL)
+			status = 1 << USB_ENDPOINT_HALT;
+		else
+			status = 0;
+		break;
+	default:
+		pipe_stall(r8a66597, 0);
+		return;		/* exit */
+	}
+
+	r8a66597->ep0_data = cpu_to_le16(status);
+	r8a66597->ep0_req->buf = &r8a66597->ep0_data;
+	r8a66597->ep0_req->length = 2;
+	/* AV: what happens if we get called again before that gets through? */
+	spin_unlock(&r8a66597->lock);
+	r8a66597_queue(r8a66597->gadget.ep0, r8a66597->ep0_req, GFP_KERNEL);
+	spin_lock(&r8a66597->lock);
+}
+
+static void clear_feature(struct r8a66597 *r8a66597,
+				struct usb_ctrlrequest *ctrl)
+{
+	switch (ctrl->bRequestType & USB_RECIP_MASK) {
+	case USB_RECIP_DEVICE:
+		control_end(r8a66597, 1);
+		break;
+	case USB_RECIP_INTERFACE:
+		control_end(r8a66597, 1);
+		break;
+	case USB_RECIP_ENDPOINT: {
+		struct r8a66597_ep *ep;
+		struct r8a66597_request *req;
+		u16 w_index = le16_to_cpu(ctrl->wIndex);
+
+		ep = r8a66597->epaddr2ep[w_index & USB_ENDPOINT_NUMBER_MASK];
+		pipe_stop(r8a66597, ep->pipenum);
+		control_reg_sqclr(r8a66597, ep->pipenum);
+
+		control_end(r8a66597, 1);
+
+		req = get_request_from_ep(ep);
+		if (ep->busy) {
+			ep->busy = 0;
+			if (list_empty(&ep->queue))
+				break;
+			start_packet(ep, req);
+		} else if (!list_empty(&ep->queue))
+			pipe_start(r8a66597, ep->pipenum);
+		}
+		break;
+	default:
+		pipe_stall(r8a66597, 0);
+		break;
+	}
+}
+
+static void set_feature(struct r8a66597 *r8a66597, struct usb_ctrlrequest *ctrl)
+{
+
+	switch (ctrl->bRequestType & USB_RECIP_MASK) {
+	case USB_RECIP_DEVICE:
+		control_end(r8a66597, 1);
+		break;
+	case USB_RECIP_INTERFACE:
+		control_end(r8a66597, 1);
+		break;
+	case USB_RECIP_ENDPOINT: {
+		struct r8a66597_ep *ep;
+		u16 w_index = le16_to_cpu(ctrl->wIndex);
+
+		ep = r8a66597->epaddr2ep[w_index & USB_ENDPOINT_NUMBER_MASK];
+		pipe_stall(r8a66597, ep->pipenum);
+
+		control_end(r8a66597, 1);
+		}
+		break;
+	default:
+		pipe_stall(r8a66597, 0);
+		break;
+	}
+}
+
+/* if return value is true, call class driver's setup() */
+static int setup_packet(struct r8a66597 *r8a66597, struct usb_ctrlrequest *ctrl)
+{
+	u16 *p = (u16 *)ctrl;
+	unsigned long offset = USBREQ;
+	int i, ret = 0;
+
+	/* read fifo */
+	r8a66597_write(r8a66597, ~VALID, INTSTS0);
+
+	for (i = 0; i < 4; i++)
+		p[i] = r8a66597_read(r8a66597, offset + i*2);
+
+	/* check request */
+	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
+		switch (ctrl->bRequest) {
+		case USB_REQ_GET_STATUS:
+			get_status(r8a66597, ctrl);
+			break;
+		case USB_REQ_CLEAR_FEATURE:
+			clear_feature(r8a66597, ctrl);
+			break;
+		case USB_REQ_SET_FEATURE:
+			set_feature(r8a66597, ctrl);
+			break;
+		default:
+			ret = 1;
+			break;
+		}
+	} else
+		ret = 1;
+	return ret;
+}
+
+static void r8a66597_update_usb_speed(struct r8a66597 *r8a66597)
+{
+	u16 speed = get_usb_speed(r8a66597);
+
+	switch (speed) {
+	case HSMODE:
+		r8a66597->gadget.speed = USB_SPEED_HIGH;
+		break;
+	case FSMODE:
+		r8a66597->gadget.speed = USB_SPEED_FULL;
+		break;
+	default:
+		r8a66597->gadget.speed = USB_SPEED_UNKNOWN;
+		printk(KERN_ERR "USB speed unknown\n");
+	}
+}
+
+static void irq_device_state(struct r8a66597 *r8a66597)
+{
+	u16 dvsq;
+
+	dvsq = r8a66597_read(r8a66597, INTSTS0) & DVSQ;
+	r8a66597_write(r8a66597, ~DVST, INTSTS0);
+
+	if (dvsq == DS_DFLT) {
+		/* bus reset */
+		r8a66597->driver->disconnect(&r8a66597->gadget);
+		r8a66597_update_usb_speed(r8a66597);
+	}
+	if (r8a66597->old_dvsq == DS_CNFG && dvsq != DS_CNFG)
+		r8a66597_update_usb_speed(r8a66597);
+	if ((dvsq == DS_CNFG || dvsq == DS_ADDS)
+			&& r8a66597->gadget.speed == USB_SPEED_UNKNOWN)
+		r8a66597_update_usb_speed(r8a66597);
+
+	r8a66597->old_dvsq = dvsq;
+}
+
+static void irq_control_stage(struct r8a66597 *r8a66597)
+__releases(r8a66597->lock)
+__acquires(r8a66597->lock)
+{
+	struct usb_ctrlrequest ctrl;
+	u16 ctsq;
+
+	ctsq = r8a66597_read(r8a66597, INTSTS0) & CTSQ;
+	r8a66597_write(r8a66597, ~CTRT, INTSTS0);
+
+	switch (ctsq) {
+	case CS_IDST: {
+		struct r8a66597_ep *ep;
+		struct r8a66597_request *req;
+		ep = &r8a66597->ep[0];
+		req = get_request_from_ep(ep);
+		transfer_complete(ep, req, 0);
+		}
+		break;
+
+	case CS_RDDS:
+	case CS_WRDS:
+	case CS_WRND:
+		if (setup_packet(r8a66597, &ctrl)) {
+			spin_unlock(&r8a66597->lock);
+			if (r8a66597->driver->setup(&r8a66597->gadget, &ctrl)
+				< 0)
+				pipe_stall(r8a66597, 0);
+			spin_lock(&r8a66597->lock);
+		}
+		break;
+	case CS_RDSS:
+	case CS_WRSS:
+		control_end(r8a66597, 0);
+		break;
+	default:
+		printk(KERN_ERR "ctrl_stage: unexpect ctsq(%x)\n", ctsq);
+		break;
+	}
+}
+
+static irqreturn_t r8a66597_irq(int irq, void *_r8a66597)
+{
+	struct r8a66597 *r8a66597 = _r8a66597;
+	u16 intsts0;
+	u16 intenb0;
+	u16 brdysts, nrdysts, bempsts;
+	u16 brdyenb, nrdyenb, bempenb;
+	u16 savepipe;
+	u16 mask0;
+
+	spin_lock(&r8a66597->lock);
+
+	intsts0 = r8a66597_read(r8a66597, INTSTS0);
+	intenb0 = r8a66597_read(r8a66597, INTENB0);
+
+	savepipe = r8a66597_read(r8a66597, CFIFOSEL);
+
+	mask0 = intsts0 & intenb0;
+	if (mask0) {
+		brdysts = r8a66597_read(r8a66597, BRDYSTS);
+		nrdysts = r8a66597_read(r8a66597, NRDYSTS);
+		bempsts = r8a66597_read(r8a66597, BEMPSTS);
+		brdyenb = r8a66597_read(r8a66597, BRDYENB);
+		nrdyenb = r8a66597_read(r8a66597, NRDYENB);
+		bempenb = r8a66597_read(r8a66597, BEMPENB);
+
+		if (mask0 & VBINT) {
+			r8a66597_write(r8a66597,  0xffff & ~VBINT,
+					INTSTS0);
+			r8a66597_start_xclock(r8a66597);
+
+			/* start vbus sampling */
+			r8a66597->old_vbus = r8a66597_read(r8a66597, INTSTS0)
+					& VBSTS;
+			r8a66597->scount = R8A66597_MAX_SAMPLING;
+
+			mod_timer(&r8a66597->timer,
+					jiffies + msecs_to_jiffies(50));
+		}
+		if (intsts0 & DVSQ)
+			irq_device_state(r8a66597);
+
+		if ((intsts0 & BRDY) && (intenb0 & BRDYE)
+				&& (brdysts & brdyenb))
+			irq_pipe_ready(r8a66597, brdysts, brdyenb);
+		if ((intsts0 & BEMP) && (intenb0 & BEMPE)
+				&& (bempsts & bempenb))
+			irq_pipe_empty(r8a66597, bempsts, bempenb);
+
+		if (intsts0 & CTRT)
+			irq_control_stage(r8a66597);
+	}
+
+	r8a66597_write(r8a66597, savepipe, CFIFOSEL);
+
+	spin_unlock(&r8a66597->lock);
+	return IRQ_HANDLED;
+}
+
+static void r8a66597_timer(unsigned long _r8a66597)
+{
+	struct r8a66597 *r8a66597 = (struct r8a66597 *)_r8a66597;
+	unsigned long flags;
+	u16 tmp;
+
+	spin_lock_irqsave(&r8a66597->lock, flags);
+	tmp = r8a66597_read(r8a66597, SYSCFG0);
+	if (r8a66597->scount > 0) {
+		tmp = r8a66597_read(r8a66597, INTSTS0) & VBSTS;
+		if (tmp == r8a66597->old_vbus) {
+			r8a66597->scount--;
+			if (r8a66597->scount == 0) {
+				if (tmp == VBSTS)
+					r8a66597_usb_connect(r8a66597);
+				else
+					r8a66597_usb_disconnect(r8a66597);
+			} else {
+				mod_timer(&r8a66597->timer,
+					jiffies + msecs_to_jiffies(50));
+			}
+		} else {
+			r8a66597->scount = R8A66597_MAX_SAMPLING;
+			r8a66597->old_vbus = tmp;
+			mod_timer(&r8a66597->timer,
+					jiffies + msecs_to_jiffies(50));
+		}
+	}
+	spin_unlock_irqrestore(&r8a66597->lock, flags);
+}
+
+/*-------------------------------------------------------------------------*/
+static int r8a66597_enable(struct usb_ep *_ep,
+			 const struct usb_endpoint_descriptor *desc)
+{
+	struct r8a66597_ep *ep;
+
+	ep = container_of(_ep, struct r8a66597_ep, ep);
+	return alloc_pipe_config(ep, desc);
+}
+
+static int r8a66597_disable(struct usb_ep *_ep)
+{
+	struct r8a66597_ep *ep;
+	struct r8a66597_request *req;
+	unsigned long flags;
+
+	ep = container_of(_ep, struct r8a66597_ep, ep);
+	BUG_ON(!ep);
+
+	while (!list_empty(&ep->queue)) {
+		req = get_request_from_ep(ep);
+		spin_lock_irqsave(&ep->r8a66597->lock, flags);
+		transfer_complete(ep, req, -ECONNRESET);
+		spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
+	}
+
+	pipe_irq_disable(ep->r8a66597, ep->pipenum);
+	return free_pipe_config(ep);
+}
+
+static struct usb_request *r8a66597_alloc_request(struct usb_ep *_ep,
+						gfp_t gfp_flags)
+{
+	struct r8a66597_request *req;
+
+	req = kzalloc(sizeof(struct r8a66597_request), gfp_flags);
+	if (!req)
+		return NULL;
+
+	INIT_LIST_HEAD(&req->queue);
+
+	return &req->req;
+}
+
+static void r8a66597_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct r8a66597_request *req;
+
+	req = container_of(_req, struct r8a66597_request, req);
+	kfree(req);
+}
+
+static int r8a66597_queue(struct usb_ep *_ep, struct usb_request *_req,
+			gfp_t gfp_flags)
+{
+	struct r8a66597_ep *ep;
+	struct r8a66597_request *req;
+	unsigned long flags;
+	int request = 0;
+
+	ep = container_of(_ep, struct r8a66597_ep, ep);
+	req = container_of(_req, struct r8a66597_request, req);
+
+	if (ep->r8a66597->gadget.speed == USB_SPEED_UNKNOWN)
+		return -ESHUTDOWN;
+
+	spin_lock_irqsave(&ep->r8a66597->lock, flags);
+
+	if (list_empty(&ep->queue))
+		request = 1;
+
+	list_add_tail(&req->queue, &ep->queue);
+	req->req.actual = 0;
+	req->req.status = -EINPROGRESS;
+
+	if (ep->desc == NULL)	/* control */
+		start_ep0(ep, req);
+	else {
+		if (request && !ep->busy)
+			start_packet(ep, req);
+	}
+
+	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
+
+	return 0;
+}
+
+static int r8a66597_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct r8a66597_ep *ep;
+	struct r8a66597_request *req;
+	unsigned long flags;
+
+	ep = container_of(_ep, struct r8a66597_ep, ep);
+	req = container_of(_req, struct r8a66597_request, req);
+
+	spin_lock_irqsave(&ep->r8a66597->lock, flags);
+	if (!list_empty(&ep->queue))
+		transfer_complete(ep, req, -ECONNRESET);
+	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
+
+	return 0;
+}
+
+static int r8a66597_set_halt(struct usb_ep *_ep, int value)
+{
+	struct r8a66597_ep *ep;
+	struct r8a66597_request *req;
+	unsigned long flags;
+	int ret = 0;
+
+	ep = container_of(_ep, struct r8a66597_ep, ep);
+	req = get_request_from_ep(ep);
+
+	spin_lock_irqsave(&ep->r8a66597->lock, flags);
+	if (!list_empty(&ep->queue)) {
+		ret = -EAGAIN;
+		goto out;
+	}
+	if (value) {
+		ep->busy = 1;
+		pipe_stall(ep->r8a66597, ep->pipenum);
+	} else {
+		ep->busy = 0;
+		pipe_stop(ep->r8a66597, ep->pipenum);
+	}
+
+out:
+	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
+	return ret;
+}
+
+static void r8a66597_fifo_flush(struct usb_ep *_ep)
+{
+	struct r8a66597_ep *ep;
+	unsigned long flags;
+
+	ep = container_of(_ep, struct r8a66597_ep, ep);
+	spin_lock_irqsave(&ep->r8a66597->lock, flags);
+	if (list_empty(&ep->queue) && !ep->busy) {
+		pipe_stop(ep->r8a66597, ep->pipenum);
+		r8a66597_bclr(ep->r8a66597, BCLR, ep->fifoctr);
+	}
+	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
+}
+
+static struct usb_ep_ops r8a66597_ep_ops = {
+	.enable		= r8a66597_enable,
+	.disable	= r8a66597_disable,
+
+	.alloc_request	= r8a66597_alloc_request,
+	.free_request	= r8a66597_free_request,
+
+	.queue		= r8a66597_queue,
+	.dequeue	= r8a66597_dequeue,
+
+	.set_halt	= r8a66597_set_halt,
+	.fifo_flush	= r8a66597_fifo_flush,
+};
+
+/*-------------------------------------------------------------------------*/
+static struct r8a66597 *the_controller;
+
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+	struct r8a66597 *r8a66597 = the_controller;
+	int retval;
+
+	if (!driver
+			|| driver->speed != USB_SPEED_HIGH
+			|| !driver->bind
+			|| !driver->setup)
+		return -EINVAL;
+	if (!r8a66597)
+		return -ENODEV;
+	if (r8a66597->driver)
+		return -EBUSY;
+
+	/* hook up the driver */
+	driver->driver.bus = NULL;
+	r8a66597->driver = driver;
+	r8a66597->gadget.dev.driver = &driver->driver;
+
+	retval = device_add(&r8a66597->gadget.dev);
+	if (retval) {
+		printk(KERN_ERR "device_add error (%d)\n", retval);
+		goto error;
+	}
+
+	retval = driver->bind(&r8a66597->gadget);
+	if (retval) {
+		printk(KERN_ERR "bind to driver error (%d)\n", retval);
+		device_del(&r8a66597->gadget.dev);
+		goto error;
+	}
+
+	r8a66597_bset(r8a66597, VBSE, INTENB0);
+	if (r8a66597_read(r8a66597, INTSTS0) & VBSTS) {
+		r8a66597_start_xclock(r8a66597);
+		/* start vbus sampling */
+		r8a66597->old_vbus = r8a66597_read(r8a66597,
+					 INTSTS0) & VBSTS;
+		r8a66597->scount = R8A66597_MAX_SAMPLING;
+		mod_timer(&r8a66597->timer, jiffies + msecs_to_jiffies(50));
+	}
+
+	return 0;
+
+error:
+	r8a66597->driver = NULL;
+	r8a66597->gadget.dev.driver = NULL;
+
+	return retval;
+}
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+	struct r8a66597 *r8a66597 = the_controller;
+	unsigned long flags;
+
+	if (driver != r8a66597->driver || !driver->unbind)
+		return -EINVAL;
+
+	spin_lock_irqsave(&r8a66597->lock, flags);
+	if (r8a66597->gadget.speed != USB_SPEED_UNKNOWN)
+		r8a66597_usb_disconnect(r8a66597);
+	spin_unlock_irqrestore(&r8a66597->lock, flags);
+
+	r8a66597_bclr(r8a66597, VBSE, INTENB0);
+
+	driver->unbind(&r8a66597->gadget);
+
+	init_controller(r8a66597);
+	disable_controller(r8a66597);
+
+	device_del(&r8a66597->gadget.dev);
+	r8a66597->driver = NULL;
+	return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+/*-------------------------------------------------------------------------*/
+static int r8a66597_get_frame(struct usb_gadget *_gadget)
+{
+	struct r8a66597 *r8a66597 = gadget_to_r8a66597(_gadget);
+	return r8a66597_read(r8a66597, FRMNUM) & 0x03FF;
+}
+
+static struct usb_gadget_ops r8a66597_gadget_ops = {
+	.get_frame		= r8a66597_get_frame,
+};
+
+static int __exit r8a66597_remove(struct platform_device *pdev)
+{
+	struct r8a66597		*r8a66597 = dev_get_drvdata(&pdev->dev);
+
+	del_timer_sync(&r8a66597->timer);
+	iounmap((void *)r8a66597->reg);
+	free_irq(platform_get_irq(pdev, 0), r8a66597);
+	r8a66597_free_request(&r8a66597->ep[0].ep, r8a66597->ep0_req);
+	kfree(r8a66597);
+	return 0;
+}
+
+static void nop_completion(struct usb_ep *ep, struct usb_request *r)
+{
+}
+
+static int __init r8a66597_probe(struct platform_device *pdev)
+{
+	struct resource *res, *ires;
+	int irq;
+	void __iomem *reg = NULL;
+	struct r8a66597 *r8a66597 = NULL;
+	int ret = 0;
+	int i;
+	unsigned long irq_trigger;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		ret = -ENODEV;
+		printk(KERN_ERR "platform_get_resource error.\n");
+		goto clean_up;
+	}
+
+	ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	irq = ires->start;
+	irq_trigger = ires->flags & IRQF_TRIGGER_MASK;
+
+	if (irq < 0) {
+		ret = -ENODEV;
+		printk(KERN_ERR "platform_get_irq error.\n");
+		goto clean_up;
+	}
+
+	reg = ioremap(res->start, resource_size(res));
+	if (reg == NULL) {
+		ret = -ENOMEM;
+		printk(KERN_ERR "ioremap error.\n");
+		goto clean_up;
+	}
+
+	/* initialize ucd */
+	r8a66597 = kzalloc(sizeof(struct r8a66597), GFP_KERNEL);
+	if (r8a66597 == NULL) {
+		printk(KERN_ERR "kzalloc error\n");
+		goto clean_up;
+	}
+
+	spin_lock_init(&r8a66597->lock);
+	dev_set_drvdata(&pdev->dev, r8a66597);
+	r8a66597->pdata = pdev->dev.platform_data;
+	r8a66597->irq_sense_low = irq_trigger == IRQF_TRIGGER_LOW;
+
+	r8a66597->gadget.ops = &r8a66597_gadget_ops;
+	device_initialize(&r8a66597->gadget.dev);
+	dev_set_name(&r8a66597->gadget.dev, "gadget");
+	r8a66597->gadget.is_dualspeed = 1;
+	r8a66597->gadget.dev.parent = &pdev->dev;
+	r8a66597->gadget.dev.dma_mask = pdev->dev.dma_mask;
+	r8a66597->gadget.dev.release = pdev->dev.release;
+	r8a66597->gadget.name = udc_name;
+
+	init_timer(&r8a66597->timer);
+	r8a66597->timer.function = r8a66597_timer;
+	r8a66597->timer.data = (unsigned long)r8a66597;
+	r8a66597->reg = (unsigned long)reg;
+
+	r8a66597->bi_bufnum = R8A66597_BASE_BUFNUM;
+
+	disable_controller(r8a66597); /* make sure controller is disabled */
+
+	ret = request_irq(irq, r8a66597_irq, IRQF_DISABLED | IRQF_SHARED,
+			udc_name, r8a66597);
+	if (ret < 0) {
+		printk(KERN_ERR "request_irq error (%d)\n", ret);
+		goto clean_up;
+	}
+
+	INIT_LIST_HEAD(&r8a66597->gadget.ep_list);
+	r8a66597->gadget.ep0 = &r8a66597->ep[0].ep;
+	INIT_LIST_HEAD(&r8a66597->gadget.ep0->ep_list);
+	for (i = 0; i < R8A66597_MAX_NUM_PIPE; i++) {
+		struct r8a66597_ep *ep = &r8a66597->ep[i];
+
+		if (i != 0) {
+			INIT_LIST_HEAD(&r8a66597->ep[i].ep.ep_list);
+			list_add_tail(&r8a66597->ep[i].ep.ep_list,
+					&r8a66597->gadget.ep_list);
+		}
+		ep->r8a66597 = r8a66597;
+		INIT_LIST_HEAD(&ep->queue);
+		ep->ep.name = r8a66597_ep_name[i];
+		ep->ep.ops = &r8a66597_ep_ops;
+		ep->ep.maxpacket = 512;
+	}
+	r8a66597->ep[0].ep.maxpacket = 64;
+	r8a66597->ep[0].pipenum = 0;
+	r8a66597->ep[0].fifoaddr = CFIFO;
+	r8a66597->ep[0].fifosel = CFIFOSEL;
+	r8a66597->ep[0].fifoctr = CFIFOCTR;
+	r8a66597->ep[0].fifotrn = 0;
+	r8a66597->ep[0].pipectr = get_pipectr_addr(0);
+	r8a66597->pipenum2ep[0] = &r8a66597->ep[0];
+	r8a66597->epaddr2ep[0] = &r8a66597->ep[0];
+
+	the_controller = r8a66597;
+
+	r8a66597->ep0_req = r8a66597_alloc_request(&r8a66597->ep[0].ep,
+							GFP_KERNEL);
+	if (r8a66597->ep0_req == NULL)
+		goto clean_up2;
+	r8a66597->ep0_req->complete = nop_completion;
+
+	init_controller(r8a66597);
+
+	dev_info(&pdev->dev, "version %s\n", DRIVER_VERSION);
+	return 0;
+
+clean_up2:
+	free_irq(irq, r8a66597);
+clean_up:
+	if (r8a66597) {
+		if (r8a66597->ep0_req)
+			r8a66597_free_request(&r8a66597->ep[0].ep,
+						r8a66597->ep0_req);
+		kfree(r8a66597);
+	}
+	if (reg)
+		iounmap(reg);
+
+	return ret;
+}
+
+/*-------------------------------------------------------------------------*/
+static struct platform_driver r8a66597_driver = {
+	.remove =	__exit_p(r8a66597_remove),
+	.driver		= {
+		.name =	(char *) udc_name,
+	},
+};
+
+static int __init r8a66597_udc_init(void)
+{
+	return platform_driver_probe(&r8a66597_driver, r8a66597_probe);
+}
+module_init(r8a66597_udc_init);
+
+static void __exit r8a66597_udc_cleanup(void)
+{
+	platform_driver_unregister(&r8a66597_driver);
+}
+module_exit(r8a66597_udc_cleanup);
+
+MODULE_DESCRIPTION("R8A66597 USB gadget driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yoshihiro Shimoda");
+
diff --git a/drivers/usb/gadget/r8a66597-udc.h b/drivers/usb/gadget/r8a66597-udc.h
new file mode 100644
index 00000000000..a2464bf337c
--- /dev/null
+++ b/drivers/usb/gadget/r8a66597-udc.h
@@ -0,0 +1,249 @@
+/*
+ * R8A66597 UDC
+ *
+ * Copyright (C) 2007-2009 Renesas Solutions Corp.
+ *
+ * Author : Yoshihiro Shimoda <shimoda.yoshihiro@renesas.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; version 2 of the License.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef __R8A66597_H__
+#define __R8A66597_H__
+
+#include <linux/usb/r8a66597.h>
+
+#define R8A66597_MAX_SAMPLING	10
+
+#define R8A66597_MAX_NUM_PIPE	8
+#define R8A66597_MAX_NUM_BULK	3
+#define R8A66597_MAX_NUM_ISOC	2
+#define R8A66597_MAX_NUM_INT	2
+
+#define R8A66597_BASE_PIPENUM_BULK	3
+#define R8A66597_BASE_PIPENUM_ISOC	1
+#define R8A66597_BASE_PIPENUM_INT	6
+
+#define R8A66597_BASE_BUFNUM	6
+#define R8A66597_MAX_BUFNUM	0x4F
+
+#define is_bulk_pipe(pipenum)	\
+	((pipenum >= R8A66597_BASE_PIPENUM_BULK) && \
+	 (pipenum < (R8A66597_BASE_PIPENUM_BULK + R8A66597_MAX_NUM_BULK)))
+#define is_interrupt_pipe(pipenum)	\
+	((pipenum >= R8A66597_BASE_PIPENUM_INT) && \
+	 (pipenum < (R8A66597_BASE_PIPENUM_INT + R8A66597_MAX_NUM_INT)))
+#define is_isoc_pipe(pipenum)	\
+	((pipenum >= R8A66597_BASE_PIPENUM_ISOC) && \
+	 (pipenum < (R8A66597_BASE_PIPENUM_ISOC + R8A66597_MAX_NUM_ISOC)))
+
+struct r8a66597_pipe_info {
+	u16	pipe;
+	u16	epnum;
+	u16	maxpacket;
+	u16	type;
+	u16	interval;
+	u16	dir_in;
+};
+
+struct r8a66597_request {
+	struct usb_request	req;
+	struct list_head	queue;
+};
+
+struct r8a66597_ep {
+	struct usb_ep		ep;
+	struct r8a66597		*r8a66597;
+
+	struct list_head	queue;
+	unsigned		busy:1;
+	unsigned		internal_ccpl:1;	/* use only control */
+
+	/* this member can able to after r8a66597_enable */
+	unsigned		use_dma:1;
+	u16			pipenum;
+	u16			type;
+	const struct usb_endpoint_descriptor	*desc;
+	/* register address */
+	unsigned char		fifoaddr;
+	unsigned char		fifosel;
+	unsigned char		fifoctr;
+	unsigned char		fifotrn;
+	unsigned char		pipectr;
+};
+
+struct r8a66597 {
+	spinlock_t		lock;
+	unsigned long		reg;
+
+	struct r8a66597_platdata	*pdata;
+
+	struct usb_gadget		gadget;
+	struct usb_gadget_driver	*driver;
+
+	struct r8a66597_ep	ep[R8A66597_MAX_NUM_PIPE];
+	struct r8a66597_ep	*pipenum2ep[R8A66597_MAX_NUM_PIPE];
+	struct r8a66597_ep	*epaddr2ep[16];
+
+	struct timer_list	timer;
+	struct usb_request	*ep0_req;	/* for internal request */
+	u16			ep0_data;	/* for internal request */
+	u16			old_vbus;
+	u16			scount;
+	u16			old_dvsq;
+
+	/* pipe config */
+	unsigned short bi_bufnum;	/* bulk and isochronous's bufnum */
+	unsigned char bulk;
+	unsigned char interrupt;
+	unsigned char isochronous;
+	unsigned char num_dma;
+
+	unsigned irq_sense_low:1;
+};
+
+#define gadget_to_r8a66597(_gadget)	\
+		container_of(_gadget, struct r8a66597, gadget)
+#define r8a66597_to_gadget(r8a66597) (&r8a66597->gadget)
+
+static inline u16 r8a66597_read(struct r8a66597 *r8a66597, unsigned long offset)
+{
+	return inw(r8a66597->reg + offset);
+}
+
+static inline void r8a66597_read_fifo(struct r8a66597 *r8a66597,
+				      unsigned long offset, u16 *buf,
+				      int len)
+{
+	if (r8a66597->pdata->on_chip) {
+		unsigned long fifoaddr = r8a66597->reg + offset;
+		unsigned long count;
+		union {
+			unsigned long dword;
+			unsigned char byte[4];
+		} data;
+		unsigned char *pb;
+		int i;
+
+		count = len / 4;
+		insl(fifoaddr, buf, count);
+
+		if (len & 0x00000003) {
+			data.dword = inl(fifoaddr);
+			pb = (unsigned char *)buf + count * 4;
+			for (i = 0; i < (len & 0x00000003); i++)
+				pb[i] = data.byte[i];
+		}
+	} else {
+		len = (len + 1) / 2;
+		insw(r8a66597->reg + offset, buf, len);
+	}
+}
+
+static inline void r8a66597_write(struct r8a66597 *r8a66597, u16 val,
+				  unsigned long offset)
+{
+	outw(val, r8a66597->reg + offset);
+}
+
+static inline void r8a66597_write_fifo(struct r8a66597 *r8a66597,
+				       unsigned long offset, u16 *buf,
+				       int len)
+{
+	unsigned long fifoaddr = r8a66597->reg + offset;
+
+	if (r8a66597->pdata->on_chip) {
+		unsigned long count;
+		unsigned char *pb;
+		int i;
+
+		count = len / 4;
+		outsl(fifoaddr, buf, count);
+
+		if (len & 0x00000003) {
+			pb = (unsigned char *)buf + count * 4;
+			for (i = 0; i < (len & 0x00000003); i++) {
+				if (r8a66597_read(r8a66597, CFIFOSEL) & BIGEND)
+					outb(pb[i], fifoaddr + i);
+				else
+					outb(pb[i], fifoaddr + 3 - i);
+			}
+		}
+	} else {
+		int odd = len & 0x0001;
+
+		len = len / 2;
+		outsw(fifoaddr, buf, len);
+		if (unlikely(odd)) {
+			buf = &buf[len];
+			outb((unsigned char)*buf, fifoaddr);
+		}
+	}
+}
+
+static inline void r8a66597_mdfy(struct r8a66597 *r8a66597,
+				 u16 val, u16 pat, unsigned long offset)
+{
+	u16 tmp;
+	tmp = r8a66597_read(r8a66597, offset);
+	tmp = tmp & (~pat);
+	tmp = tmp | val;
+	r8a66597_write(r8a66597, tmp, offset);
+}
+
+static inline u16 get_xtal_from_pdata(struct r8a66597_platdata *pdata)
+{
+	u16 clock = 0;
+
+	switch (pdata->xtal) {
+	case R8A66597_PLATDATA_XTAL_12MHZ:
+		clock = XTAL12;
+		break;
+	case R8A66597_PLATDATA_XTAL_24MHZ:
+		clock = XTAL24;
+		break;
+	case R8A66597_PLATDATA_XTAL_48MHZ:
+		clock = XTAL48;
+		break;
+	default:
+		printk(KERN_ERR "r8a66597: platdata clock is wrong.\n");
+		break;
+	}
+
+	return clock;
+}
+
+#define r8a66597_bclr(r8a66597, val, offset)	\
+			r8a66597_mdfy(r8a66597, 0, val, offset)
+#define r8a66597_bset(r8a66597, val, offset)	\
+			r8a66597_mdfy(r8a66597, val, 0, offset)
+
+#define get_pipectr_addr(pipenum)	(PIPE1CTR + (pipenum - 1) * 2)
+
+#define enable_irq_ready(r8a66597, pipenum)	\
+	enable_pipe_irq(r8a66597, pipenum, BRDYENB)
+#define disable_irq_ready(r8a66597, pipenum)	\
+	disable_pipe_irq(r8a66597, pipenum, BRDYENB)
+#define enable_irq_empty(r8a66597, pipenum)	\
+	enable_pipe_irq(r8a66597, pipenum, BEMPENB)
+#define disable_irq_empty(r8a66597, pipenum)	\
+	disable_pipe_irq(r8a66597, pipenum, BEMPENB)
+#define enable_irq_nrdy(r8a66597, pipenum)	\
+	enable_pipe_irq(r8a66597, pipenum, NRDYENB)
+#define disable_irq_nrdy(r8a66597, pipenum)	\
+	disable_pipe_irq(r8a66597, pipenum, NRDYENB)
+
+#endif	/* __R8A66597_H__ */
+