openwrt/target/linux/xburst/patches-2.6.34/056-udc.patch

From 644d56ba485f220b1b740b320760a12b5e4e0308 Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Sat, 24 Apr 2010 12:18:46 +0200
Subject: [PATCH] Add jz4740 udc driver

---
 drivers/usb/gadget/Kconfig        |   14 +
 drivers/usb/gadget/Makefile       |    1 +
 drivers/usb/gadget/gadget_chips.h |    9 +
 drivers/usb/gadget/jz4740_udc.c   | 2437 +++++++++++++++++++++++++++++++++++++
 drivers/usb/gadget/jz4740_udc.h   |  100 ++
 5 files changed, 2561 insertions(+), 0 deletions(-)
 create mode 100644 drivers/usb/gadget/jz4740_udc.c
 create mode 100644 drivers/usb/gadget/jz4740_udc.h

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 11a3e0f..a33d0c8 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -121,11 +121,25 @@ choice
 #
 # Integrated controllers
 #
+config USB_GADGET_JZ4740
+	boolean "JZ4740 UDC"
+	depends on SOC_JZ4740
+	select USB_GADGET_SELECTED
+	select USB_GADGET_DUALSPEED
+	help
+    	   Select this to support the Ingenic JZ4740 processor
+           high speed USB device controller.
+
+config USB_JZ4740
+	tristate
+	depends on USB_GADGET_JZ4740
+	default USB_GADGET
 
 config USB_GADGET_AT91
 	boolean "Atmel AT91 USB Device Port"
 	depends on ARCH_AT91 && !ARCH_AT91SAM9RL && !ARCH_AT91CAP9 && !ARCH_AT91SAM9G45
 	select USB_GADGET_SELECTED
+
 	help
 	   Many Atmel AT91 processors (such as the AT91RM2000) have a
 	   full speed USB Device Port with support for five configurable
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 43b51da..8c6ee6b 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_USB_FSL_QE)	+= fsl_qe_udc.o
 obj-$(CONFIG_USB_CI13XXX)	+= ci13xxx_udc.o
 obj-$(CONFIG_USB_S3C_HSOTG)	+= s3c-hsotg.o
 obj-$(CONFIG_USB_LANGWELL)	+= langwell_udc.o
+obj-$(CONFIG_USB_JZ4740)	+= jz4740_udc.o
 
 #
 # USB gadget drivers
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index e511fec..b2ec5fb 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -15,6 +15,12 @@
 #ifndef __GADGET_CHIPS_H
 #define __GADGET_CHIPS_H
 
+#ifdef CONFIG_USB_GADGET_JZ4740
+#define	gadget_is_jz4740(g)	!strcmp("ingenic_hsusb", (g)->name)
+#else
+#define	gadget_is_jz4740(g)	0
+#endif
+
 #ifdef CONFIG_USB_GADGET_NET2280
 #define	gadget_is_net2280(g)	!strcmp("net2280", (g)->name)
 #else
@@ -200,6 +206,9 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
 		return 0x25;
 	else if (gadget_is_s3c_hsotg(gadget))
 		return 0x26;
+	else if (gadget_is_jz4740(gadget))
+		return 0x27;
+
 	return -ENOENT;
 }
 
diff --git a/drivers/usb/gadget/jz4740_udc.c b/drivers/usb/gadget/jz4740_udc.c
new file mode 100644
index 0000000..e84c817
--- /dev/null
+++ b/drivers/usb/gadget/jz4740_udc.c
@@ -0,0 +1,2437 @@
+/*
+ * linux/drivers/usb/gadget/jz4740_udc.c
+ *
+ * Ingenic JZ4740 on-chip high speed USB device controller
+ *
+ * Copyright (C) 2006 - 2008 Ingenic Semiconductor Inc.
+ * Author: <jlwei@ingenic.cn>
+ *
+ * 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 device has ep0, two bulk-in/interrupt-in endpoints, and one bulk-out endpoint.
+ *
+ *  - Endpoint numbering is fixed: ep0, ep1in-int, ep2in-bulk, ep1out-bulk.
+ *  - DMA works with bulk-in (channel 1) and bulk-out (channel 2) endpoints.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/usb.h>
+#include <linux/usb/gadget.h>
+#include <linux/clk.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/mach-jz4740/clock.h>
+
+#include "jz4740_udc.h"
+
+#define JZ_REG_UDC_FADDR	0x00 /* Function Address 8-bit */
+#define JZ_REG_UDC_POWER	0x01 /* Power Management 8-bit */
+#define JZ_REG_UDC_INTRIN	0x02 /* Interrupt IN 16-bit */
+#define JZ_REG_UDC_INTROUT	0x04 /* Interrupt OUT 16-bit */
+#define JZ_REG_UDC_INTRINE	0x06 /* Intr IN enable 16-bit */
+#define JZ_REG_UDC_INTROUTE	0x08 /* Intr OUT enable 16-bit */
+#define JZ_REG_UDC_INTRUSB	0x0a /* Interrupt USB 8-bit */
+#define JZ_REG_UDC_INTRUSBE	0x0b /* Interrupt USB Enable 8-bit */
+#define JZ_REG_UDC_FRAME	0x0c /* Frame number 16-bit */
+#define JZ_REG_UDC_INDEX	0x0e /* Index register 8-bit */
+#define JZ_REG_UDC_TESTMODE	0x0f /* USB test mode 8-bit */
+
+#define JZ_REG_UDC_CSR0		0x12 /* EP0 CSR 8-bit */
+#define JZ_REG_UDC_INMAXP	0x10 /* EP1-2 IN Max Pkt Size 16-bit */
+#define JZ_REG_UDC_INCSR	0x12 /* EP1-2 IN CSR LSB 8/16bit */
+#define JZ_REG_UDC_INCSRH	0x13 /* EP1-2 IN CSR MSB 8-bit */
+#define JZ_REG_UDC_OUTMAXP	0x14 /* EP1 OUT Max Pkt Size 16-bit */
+#define JZ_REG_UDC_OUTCSR	0x16 /* EP1 OUT CSR LSB 8/16bit */
+#define JZ_REG_UDC_OUTCSRH	0x17 /* EP1 OUT CSR MSB 8-bit */
+#define JZ_REG_UDC_OUTCOUNT	0x18 /* bytes in EP0/1 OUT FIFO 16-bit */
+
+#define JZ_REG_UDC_EP_FIFO(x)	(4 * (x) + 0x20)
+
+#define JZ_REG_UDC_EPINFO	0x78 /* Endpoint information */
+#define JZ_REG_UDC_RAMINFO	0x79 /* RAM information */
+
+#define JZ_REG_UDC_INTR		0x200 /* DMA pending interrupts */
+#define JZ_REG_UDC_CNTL1	0x204 /* DMA channel 1 control */
+#define JZ_REG_UDC_ADDR1	0x208 /* DMA channel 1 AHB memory addr */
+#define JZ_REG_UDC_COUNT1	0x20c /* DMA channel 1 byte count */
+#define JZ_REG_UDC_CNTL2	0x214 /* DMA channel 2 control */
+#define JZ_REG_UDC_ADDR2	0x218 /* DMA channel 2 AHB memory addr */
+#define JZ_REG_UDC_COUNT2	0x21c /* DMA channel 2 byte count */
+
+/* Power register bit masks */
+#define USB_POWER_SUSPENDM	0x01
+#define USB_POWER_RESUME	0x04
+#define USB_POWER_HSMODE	0x10
+#define USB_POWER_HSENAB	0x20
+#define USB_POWER_SOFTCONN	0x40
+
+/* Interrupt register bit masks */
+#define USB_INTR_SUSPEND	0x01
+#define USB_INTR_RESUME		0x02
+#define USB_INTR_RESET		0x04
+
+#define USB_INTR_EP0		0x0001
+#define USB_INTR_INEP1		0x0002
+#define USB_INTR_INEP2		0x0004
+#define USB_INTR_OUTEP1		0x0002
+
+/* CSR0 bit masks */
+#define USB_CSR0_OUTPKTRDY	0x01
+#define USB_CSR0_INPKTRDY	0x02
+#define USB_CSR0_SENTSTALL	0x04
+#define USB_CSR0_DATAEND	0x08
+#define USB_CSR0_SETUPEND	0x10
+#define USB_CSR0_SENDSTALL	0x20
+#define USB_CSR0_SVDOUTPKTRDY	0x40
+#define USB_CSR0_SVDSETUPEND	0x80
+
+/* Endpoint CSR register bits */
+#define USB_INCSRH_AUTOSET	0x80
+#define USB_INCSRH_ISO		0x40
+#define USB_INCSRH_MODE		0x20
+#define USB_INCSRH_DMAREQENAB	0x10
+#define USB_INCSRH_DMAREQMODE	0x04
+#define USB_INCSR_CDT		0x40
+#define USB_INCSR_SENTSTALL	0x20
+#define USB_INCSR_SENDSTALL	0x10
+#define USB_INCSR_FF		0x08
+#define USB_INCSR_UNDERRUN	0x04
+#define USB_INCSR_FFNOTEMPT	0x02
+#define USB_INCSR_INPKTRDY	0x01
+#define USB_OUTCSRH_AUTOCLR	0x80
+#define USB_OUTCSRH_ISO		0x40
+#define USB_OUTCSRH_DMAREQENAB	0x20
+#define USB_OUTCSRH_DNYT	0x10
+#define USB_OUTCSRH_DMAREQMODE	0x08
+#define USB_OUTCSR_CDT		0x80
+#define USB_OUTCSR_SENTSTALL	0x40
+#define USB_OUTCSR_SENDSTALL	0x20
+#define USB_OUTCSR_FF		0x10
+#define USB_OUTCSR_DATAERR	0x08
+#define USB_OUTCSR_OVERRUN	0x04
+#define USB_OUTCSR_FFFULL	0x02
+#define USB_OUTCSR_OUTPKTRDY	0x01
+
+/* Testmode register bits */
+#define USB_TEST_SE0NAK		0x01
+#define USB_TEST_J		0x02
+#define USB_TEST_K		0x04
+#define USB_TEST_PACKET		0x08
+
+/* DMA control bits */
+#define USB_CNTL_ENA		0x01
+#define USB_CNTL_DIR_IN		0x02
+#define USB_CNTL_MODE_1		0x04
+#define USB_CNTL_INTR_EN	0x08
+#define USB_CNTL_EP(n)		((n) << 4)
+#define USB_CNTL_BURST_0	(0 << 9)
+#define USB_CNTL_BURST_4	(1 << 9)
+#define USB_CNTL_BURST_8	(2 << 9)
+#define USB_CNTL_BURST_16	(3 << 9)
+
+
+#ifndef DEBUG
+# define DEBUG(fmt,args...) do {} while(0)
+#endif
+#ifndef DEBUG_EP0
+# define NO_STATES
+# define DEBUG_EP0(fmt,args...) do {} while(0)
+#endif
+#ifndef DEBUG_SETUP
+# define DEBUG_SETUP(fmt,args...) do {} while(0)
+#endif
+
+static unsigned int use_dma = 0;   /* 1: use DMA, 0: use PIO */
+
+module_param(use_dma, int, 0);
+MODULE_PARM_DESC(use_dma, "DMA mode enable flag");
+
+struct jz4740_udc *the_controller;
+
+/*
+ * Local declarations.
+ */
+static void jz4740_ep0_kick(struct jz4740_udc *dev, struct jz4740_ep *ep);
+static void jz4740_handle_ep0(struct jz4740_udc *dev, uint32_t intr);
+
+static void done(struct jz4740_ep *ep, struct jz4740_request *req,
+		 int status);
+static void pio_irq_enable(struct jz4740_ep *ep);
+static void pio_irq_disable(struct jz4740_ep *ep);
+static void stop_activity(struct jz4740_udc *dev,
+			  struct usb_gadget_driver *driver);
+static void nuke(struct jz4740_ep *ep, int status);
+static void flush(struct jz4740_ep *ep);
+static void udc_set_address(struct jz4740_udc *dev, unsigned char address);
+
+/*-------------------------------------------------------------------------*/
+
+/* inline functions of register read/write/set/clear  */
+
+static inline uint8_t usb_readb(struct jz4740_udc *udc, size_t reg)
+{
+	return readb(udc->base + reg);
+}
+
+static inline uint16_t usb_readw(struct jz4740_udc *udc, size_t reg)
+{
+	return readw(udc->base + reg);
+}
+
+static inline uint32_t usb_readl(struct jz4740_udc *udc, size_t reg)
+{
+	return readl(udc->base + reg);
+}
+
+static inline void usb_writeb(struct jz4740_udc *udc, size_t reg, uint8_t val)
+{
+	writeb(val, udc->base + reg);
+}
+
+static inline void usb_writew(struct jz4740_udc *udc, size_t reg, uint16_t val)
+{
+	writew(val, udc->base + reg);
+}
+
+static inline void usb_writel(struct jz4740_udc *udc, size_t reg, uint32_t val)
+{
+	writel(val, udc->base + reg);
+}
+
+static inline void usb_setb(struct jz4740_udc *udc, size_t reg, uint8_t mask)
+{
+	usb_writeb(udc, reg, usb_readb(udc, reg) | mask);
+}
+
+static inline void usb_setw(struct jz4740_udc *udc, size_t reg, uint8_t mask)
+{
+	usb_writew(udc, reg, usb_readw(udc, reg) | mask);
+}
+
+static inline void usb_setl(struct jz4740_udc *udc, size_t reg, uint32_t mask)
+{
+	usb_writel(udc, reg, usb_readl(udc, reg) | mask);
+}
+
+static inline void usb_clearb(struct jz4740_udc *udc, size_t reg, uint8_t mask)
+{
+	usb_writeb(udc, reg, usb_readb(udc, reg) & ~mask);
+}
+
+static inline void usb_clearw(struct jz4740_udc *udc, size_t reg, uint16_t mask)
+{
+	usb_writew(udc, reg, usb_readw(udc, reg) & ~mask);
+}
+
+static inline void usb_clearl(struct jz4740_udc *udc, size_t reg, uint32_t mask)
+{
+	usb_writel(udc, reg, usb_readl(udc, reg) & ~mask);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static inline void jz_udc_set_index(struct jz4740_udc *udc, uint8_t index)
+{
+	usb_writeb(udc, JZ_REG_UDC_INDEX, index);
+}
+
+static inline void jz_udc_select_ep(struct jz4740_ep *ep)
+{
+	jz_udc_set_index(ep->dev, ep_index(ep));
+}
+
+static inline int write_packet(struct jz4740_ep *ep,
+				   struct jz4740_request *req, int max)
+{
+	uint8_t *buf;
+	int length, nlong, nbyte;
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	buf = req->req.buf + req->req.actual;
+	prefetch(buf);
+
+	length = req->req.length - req->req.actual;
+	length = min(length, max);
+	req->req.actual += length;
+
+	DEBUG("Write %d (max %d), fifo %x\n", length, max, ep->fifo);
+
+	nlong = length >> 2;
+	nbyte = length & 0x3;
+	while (nlong--) {
+		usb_writel(ep->dev, ep->fifo, *((uint32_t *)buf));
+		buf += 4;
+	}
+	while (nbyte--) {
+		usb_writeb(ep->dev, ep->fifo, *buf++);
+	}
+
+	return length;
+}
+
+static inline int read_packet(struct jz4740_ep *ep,
+				  struct jz4740_request *req, int count)
+{
+	uint8_t *buf;
+	int length, nlong, nbyte;
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	buf = req->req.buf + req->req.actual;
+	prefetchw(buf);
+
+	length = req->req.length - req->req.actual;
+	length = min(length, count);
+	req->req.actual += length;
+
+	DEBUG("Read %d, fifo %x\n", length, ep->fifo);
+
+	nlong = length >> 2;
+	nbyte = length & 0x3;
+	while (nlong--) {
+		*((uint32_t *)buf) = usb_readl(ep->dev, ep->fifo);
+		buf += 4;
+	}
+	while (nbyte--) {
+		*buf++ = usb_readb(ep->dev, ep->fifo);
+	}
+
+	return length;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * 	udc_disable - disable USB device controller
+ */
+static void udc_disable(struct jz4740_udc *dev)
+{
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	udc_set_address(dev, 0);
+
+	/* Disable interrupts */
+	usb_writew(dev, JZ_REG_UDC_INTRINE, 0);
+	usb_writew(dev, JZ_REG_UDC_INTROUTE, 0);
+	usb_writeb(dev, JZ_REG_UDC_INTRUSBE, 0);
+
+	/* Disable DMA */
+	usb_writel(dev, JZ_REG_UDC_CNTL1, 0);
+	usb_writel(dev, JZ_REG_UDC_CNTL2, 0);
+
+	/* Disconnect from usb */
+	usb_clearb(dev, JZ_REG_UDC_POWER, USB_POWER_SOFTCONN);
+
+	/* Disable the USB PHY */
+	clk_disable(dev->clk);
+
+	dev->ep0state = WAIT_FOR_SETUP;
+	dev->gadget.speed = USB_SPEED_UNKNOWN;
+
+	return;
+}
+
+/*
+ * 	udc_reinit - initialize software state
+ */
+static void udc_reinit(struct jz4740_udc *dev)
+{
+	int i;
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	/* device/ep0 records init */
+	INIT_LIST_HEAD(&dev->gadget.ep_list);
+	INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
+	dev->ep0state = WAIT_FOR_SETUP;
+
+	for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
+		struct jz4740_ep *ep = &dev->ep[i];
+
+		if (i != 0)
+			list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
+
+		INIT_LIST_HEAD(&ep->queue);
+		ep->desc = 0;
+		ep->stopped = 0;
+		ep->pio_irqs = 0;
+	}
+}
+
+/* until it's enabled, this UDC should be completely invisible
+ * to any USB host.
+ */
+static void udc_enable(struct jz4740_udc *dev)
+{
+	int i;
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	/* UDC state is incorrect - Added by River */
+	if (dev->state != UDC_STATE_ENABLE) {
+		return;
+	}
+
+	dev->gadget.speed = USB_SPEED_UNKNOWN;
+
+	/* Flush FIFO for each */
+	for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
+		struct jz4740_ep *ep = &dev->ep[i];
+
+		jz_udc_set_index(dev, ep_index(ep));
+		flush(ep);
+	}
+
+	/* Set this bit to allow the UDC entering low-power mode when
+	 * there are no actions on the USB bus.
+	 * UDC still works during this bit was set.
+	 */
+	jz4740_clock_udc_enable_auto_suspend();
+
+	/* Enable the USB PHY */
+	clk_enable(dev->clk);
+
+	/* Disable interrupts */
+/*	usb_writew(dev, JZ_REG_UDC_INTRINE, 0);
+	usb_writew(dev, JZ_REG_UDC_INTROUTE, 0);
+	usb_writeb(dev, JZ_REG_UDC_INTRUSBE, 0);*/
+
+	/* Enable interrupts */
+	usb_setw(dev, JZ_REG_UDC_INTRINE, USB_INTR_EP0);
+	usb_setb(dev, JZ_REG_UDC_INTRUSBE, USB_INTR_RESET);
+	/* Don't enable rest of the interrupts */
+	/* usb_setw(dev, JZ_REG_UDC_INTRINE, USB_INTR_INEP1 | USB_INTR_INEP2);
+	   usb_setw(dev, JZ_REG_UDC_INTROUTE, USB_INTR_OUTEP1); */
+
+	/* Enable SUSPEND */
+	/* usb_setb(dev, JZ_REG_UDC_POWER, USB_POWER_SUSPENDM); */
+
+	/* Enable HS Mode */
+	usb_setb(dev, JZ_REG_UDC_POWER, USB_POWER_HSENAB);
+
+	/* Let host detect UDC:
+	 * Software must write a 1 to the PMR:USB_POWER_SOFTCONN bit to turn this
+	 * transistor on and pull the USBDP pin HIGH.
+	 */
+	usb_setb(dev, JZ_REG_UDC_POWER, USB_POWER_SOFTCONN);
+
+	return;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* keeping it simple:
+ * - one bus driver, initted first;
+ * - one function driver, initted second
+ */
+
+/*
+ * Register entry point for the peripheral controller driver.
+ */
+
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+	struct jz4740_udc *dev = the_controller;
+	int retval;
+
+	if (!driver || !driver->bind) {
+		return -EINVAL;
+	}
+
+	if (!dev) {
+		return -ENODEV;
+	}
+
+	if (dev->driver) {
+		return -EBUSY;
+	}
+
+	/* hook up the driver */
+	dev->driver = driver;
+	dev->gadget.dev.driver = &driver->driver;
+
+	retval = driver->bind(&dev->gadget);
+	if (retval) {
+		DEBUG("%s: bind to driver %s --> error %d\n", dev->gadget.name,
+		            driver->driver.name, retval);
+		dev->driver = 0;
+		return retval;
+	}
+
+	/* then enable host detection and ep0; and we're ready
+	 * for set_configuration as well as eventual disconnect.
+	 */
+	udc_enable(dev);
+
+	DEBUG("%s: registered gadget driver '%s'\n", dev->gadget.name,
+	      driver->driver.name);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+static void stop_activity(struct jz4740_udc *dev,
+			  struct usb_gadget_driver *driver)
+{
+	int i;
+
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	/* don't disconnect drivers more than once */
+	if (dev->gadget.speed == USB_SPEED_UNKNOWN)
+		driver = 0;
+	dev->gadget.speed = USB_SPEED_UNKNOWN;
+
+	/* prevent new request submissions, kill any outstanding requests  */
+	for (i = 0; i < UDC_MAX_ENDPOINTS; i++) {
+		struct jz4740_ep *ep = &dev->ep[i];
+
+		ep->stopped = 1;
+
+		jz_udc_set_index(dev, ep_index(ep));
+		nuke(ep, -ESHUTDOWN);
+	}
+
+	/* report disconnect; the driver is already quiesced */
+	if (driver) {
+		spin_unlock(&dev->lock);
+		driver->disconnect(&dev->gadget);
+		spin_lock(&dev->lock);
+	}
+
+	/* re-init driver-visible data structures */
+	udc_reinit(dev);
+}
+
+
+/*
+ * Unregister entry point for the peripheral controller driver.
+ */
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+	struct jz4740_udc *dev = the_controller;
+	unsigned long flags;
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	if (!dev)
+		return -ENODEV;
+	if (!driver || driver != dev->driver)
+		return -EINVAL;
+	if (!driver->unbind)
+		return -EBUSY;
+
+	spin_lock_irqsave(&dev->lock, flags);
+	dev->driver = 0;
+	stop_activity(dev, driver);
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	driver->unbind(&dev->gadget);
+
+	udc_disable(dev);
+
+	DEBUG("unregistered driver '%s'\n", driver->driver.name);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Starting DMA using mode 1
+ */
+static void kick_dma(struct jz4740_ep *ep, struct jz4740_request *req)
+{
+	struct jz4740_udc *dev = ep->dev;
+	uint32_t count = req->req.length;
+	uint32_t physaddr = virt_to_phys((void *)req->req.buf);
+
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	jz_udc_select_ep(ep);
+
+	if (ep_is_in(ep)) { /* Bulk-IN transfer using DMA channel 1 */
+		ep->reg_addr = JZ_REG_UDC_ADDR1;
+
+		dma_cache_wback_inv((unsigned long)req->req.buf, count);
+
+		pio_irq_enable(ep);
+
+		usb_writeb(dev, JZ_REG_UDC_INCSRH,
+			   USB_INCSRH_DMAREQENAB | USB_INCSRH_AUTOSET | USB_INCSRH_DMAREQMODE);
+
+		usb_writel(dev, JZ_REG_UDC_ADDR1, physaddr);
+		usb_writel(dev, JZ_REG_UDC_COUNT1, count);
+		usb_writel(dev, JZ_REG_UDC_CNTL1, USB_CNTL_ENA | USB_CNTL_DIR_IN | USB_CNTL_MODE_1 |
+			   USB_CNTL_INTR_EN | USB_CNTL_BURST_16 | USB_CNTL_EP(ep_index(ep)));
+	}
+	else { /* Bulk-OUT transfer using DMA channel 2 */
+		ep->reg_addr = JZ_REG_UDC_ADDR2;
+
+		dma_cache_wback_inv((unsigned long)req->req.buf, count);
+
+		pio_irq_enable(ep);
+
+		usb_setb(dev, JZ_REG_UDC_OUTCSRH,
+			 USB_OUTCSRH_DMAREQENAB | USB_OUTCSRH_AUTOCLR | USB_OUTCSRH_DMAREQMODE);
+
+		usb_writel(dev, JZ_REG_UDC_ADDR2, physaddr);
+		usb_writel(dev, JZ_REG_UDC_COUNT2, count);
+		usb_writel(dev, JZ_REG_UDC_CNTL2, USB_CNTL_ENA | USB_CNTL_MODE_1 |
+			   USB_CNTL_INTR_EN | USB_CNTL_BURST_16 | USB_CNTL_EP(ep_index(ep)));
+	}
+}
+
+/*-------------------------------------------------------------------------*/
+
+/** Write request to FIFO (max write == maxp size)
+ *  Return:  0 = still running, 1 = completed, negative = errno
+ *  NOTE: INDEX register must be set for EP
+ */
+static int write_fifo(struct jz4740_ep *ep, struct jz4740_request *req)
+{
+	struct jz4740_udc *dev = ep->dev;
+	uint32_t max, csr;
+	uint32_t physaddr = virt_to_phys((void *)req->req.buf);
+
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+	max = le16_to_cpu(ep->desc->wMaxPacketSize);
+
+	if (use_dma) {
+		uint32_t dma_count;
+
+		/* DMA interrupt generated due to the last packet loaded into the FIFO */
+
+		dma_count = usb_readl(dev, ep->reg_addr) - physaddr;
+		req->req.actual += dma_count;
+
+		if (dma_count % max) {
+			/* If the last packet is less than MAXP, set INPKTRDY manually */
+			usb_setb(dev, ep->csr, USB_INCSR_INPKTRDY);
+		}
+
+		done(ep, req, 0);
+		if (list_empty(&ep->queue)) {
+			pio_irq_disable(ep);
+			return 1;
+		}
+		else {
+			/* advance the request queue */
+			req = list_entry(ep->queue.next, struct jz4740_request, queue);
+			kick_dma(ep, req);
+			return 0;
+		}
+	}
+
+	/*
+	 * PIO mode handling starts here ...
+	 */
+
+	csr = usb_readb(dev, ep->csr);
+
+	if (!(csr & USB_INCSR_FFNOTEMPT)) {
+		unsigned count;
+		int is_last, is_short;
+
+		count = write_packet(ep, req, max);
+		usb_setb(dev, ep->csr, USB_INCSR_INPKTRDY);
+
+		/* last packet is usually short (or a zlp) */
+		if (unlikely(count != max))
+			is_last = is_short = 1;
+		else {
+			if (likely(req->req.length != req->req.actual)
+			    || req->req.zero)
+				is_last = 0;
+			else
+				is_last = 1;
+			/* interrupt/iso maxpacket may not fill the fifo */
+			is_short = unlikely(max < ep_maxpacket(ep));
+		}
+
+		DEBUG("%s: wrote %s %d bytes%s%s %d left %p\n", __FUNCTION__,
+		      ep->ep.name, count,
+		      is_last ? "/L" : "", is_short ? "/S" : "",
+		      req->req.length - req->req.actual, req);
+
+		/* requests complete when all IN data is in the FIFO */
+		if (is_last) {
+			done(ep, req, 0);
+			if (list_empty(&ep->queue)) {
+				pio_irq_disable(ep);
+			}
+			return 1;
+		}
+	} else {
+		DEBUG("Hmm.. %d ep FIFO is not empty!\n", ep_index(ep));
+	}
+
+	return 0;
+}
+
+/** Read to request from FIFO (max read == bytes in fifo)
+ *  Return:  0 = still running, 1 = completed, negative = errno
+ *  NOTE: INDEX register must be set for EP
+ */
+static int read_fifo(struct jz4740_ep *ep, struct jz4740_request *req)
+{
+	struct jz4740_udc *dev = ep->dev;
+	uint32_t csr;
+	unsigned count, is_short;
+	uint32_t physaddr = virt_to_phys((void *)req->req.buf);
+
+	if (use_dma) {
+		uint32_t dma_count;
+
+		/* DMA interrupt generated due to a packet less than MAXP loaded into the FIFO */
+
+		dma_count = usb_readl(dev, ep->reg_addr) - physaddr;
+		req->req.actual += dma_count;
+
+		/* Disable interrupt and DMA */
+		pio_irq_disable(ep);
+		usb_writel(dev, JZ_REG_UDC_CNTL2, 0);
+
+		/* Read all bytes from this packet */
+		count = usb_readw(dev, JZ_REG_UDC_OUTCOUNT);
+		count = read_packet(ep, req, count);
+
+		if (count) {
+			/* If the last packet is greater than zero, clear OUTPKTRDY manually */
+			usb_clearb(dev, ep->csr, USB_OUTCSR_OUTPKTRDY);
+		}
+		done(ep, req, 0);
+
+		if (!list_empty(&ep->queue)) {
+			/* advance the request queue */
+			req = list_entry(ep->queue.next, struct jz4740_request, queue);
+			kick_dma(ep, req);
+		}
+
+		return 1;
+	}
+
+	/*
+	 * PIO mode handling starts here ...
+	 */
+
+	/* make sure there's a packet in the FIFO. */
+	csr = usb_readb(dev, ep->csr);
+	if (!(csr & USB_OUTCSR_OUTPKTRDY)) {
+		DEBUG("%s: Packet NOT ready!\n", __FUNCTION__);
+		return -EINVAL;
+	}
+
+	/* read all bytes from this packet */
+	count = usb_readw(dev, JZ_REG_UDC_OUTCOUNT);
+
+	is_short = (count < ep->ep.maxpacket);
+
+	count = read_packet(ep, req, count);
+
+	DEBUG("read %s %02x, %d bytes%s req %p %d/%d\n",
+	      ep->ep.name, csr, count,
+	      is_short ? "/S" : "", req, req->req.actual, req->req.length);
+
+	/* Clear OutPktRdy */
+	usb_clearb(dev, ep->csr, USB_OUTCSR_OUTPKTRDY);
+
+	/* completion */
+	if (is_short || req->req.actual == req->req.length) {
+		done(ep, req, 0);
+
+		if (list_empty(&ep->queue))
+			pio_irq_disable(ep);
+		return 1;
+	}
+
+	/* finished that packet.  the next one may be waiting... */
+	return 0;
+}
+
+/*
+ *	done - retire a request; caller blocked irqs
+ *  INDEX register is preserved to keep same
+ */
+static void done(struct jz4740_ep *ep, struct jz4740_request *req, int status)
+{
+	unsigned int stopped = ep->stopped;
+	uint32_t index;
+
+	DEBUG("%s, %p\n", __FUNCTION__, ep);
+	list_del_init(&req->queue);
+
+	if (likely(req->req.status == -EINPROGRESS))
+		req->req.status = status;
+	else
+		status = req->req.status;
+
+	if (status && status != -ESHUTDOWN)
+		DEBUG("complete %s req %p stat %d len %u/%u\n",
+		      ep->ep.name, &req->req, status,
+		      req->req.actual, req->req.length);
+
+	/* don't modify queue heads during completion callback */
+	ep->stopped = 1;
+	/* Read current index (completion may modify it) */
+	index = usb_readb(ep->dev, JZ_REG_UDC_INDEX);
+	spin_unlock_irqrestore(&ep->dev->lock, ep->dev->lock_flags);
+
+	req->req.complete(&ep->ep, &req->req);
+
+	spin_lock_irqsave(&ep->dev->lock, ep->dev->lock_flags);
+	/* Restore index */
+	jz_udc_set_index(ep->dev, index);
+	ep->stopped = stopped;
+}
+
+/** Enable EP interrupt */
+static void pio_irq_enable(struct jz4740_ep *ep)
+{
+	uint8_t index = ep_index(ep);
+	struct jz4740_udc *dev = ep->dev;
+	DEBUG("%s: EP%d %s\n", __FUNCTION__, ep_index(ep), ep_is_in(ep) ? "IN": "OUT");
+
+	if (ep_is_in(ep)) {
+		switch (index) {
+		case 1:
+		case 2:
+			usb_setw(dev, JZ_REG_UDC_INTRINE, BIT(index));
+			dev->in_mask |= BIT(index);
+			break;
+		default:
+			DEBUG("Unknown endpoint: %d\n", index);
+			break;
+		}
+	}
+	else {
+		switch (index) {
+		case 1:
+			usb_setw(dev, JZ_REG_UDC_INTROUTE, BIT(index));
+			dev->out_mask |= BIT(index);
+			break;
+		default:
+			DEBUG("Unknown endpoint: %d\n", index);
+			break;
+		}
+	}
+}
+
+/** Disable EP interrupt */
+static void pio_irq_disable(struct jz4740_ep *ep)
+{
+	uint8_t index = ep_index(ep);
+	struct jz4740_udc *dev = ep->dev;
+
+	DEBUG("%s: EP%d %s\n", __FUNCTION__, ep_index(ep), ep_is_in(ep) ? "IN": "OUT");
+
+	if (ep_is_in(ep)) {
+		switch (ep_index(ep)) {
+		case 1:
+		case 2:
+			usb_clearw(ep->dev, JZ_REG_UDC_INTRINE, BIT(index));
+			dev->in_mask &= ~BIT(index);
+			break;
+		default:
+			DEBUG("Unknown endpoint: %d\n", index);
+			break;
+		}
+	}
+	else {
+		switch (ep_index(ep)) {
+		case 1:
+			usb_clearw(ep->dev, JZ_REG_UDC_INTROUTE, BIT(index));
+			dev->out_mask &= ~BIT(index);
+			break;
+		default:
+			DEBUG("Unknown endpoint: %d\n", index);
+			break;
+	    }
+	}
+}
+
+/*
+ * 	nuke - dequeue ALL requests
+ */
+static void nuke(struct jz4740_ep *ep, int status)
+{
+	struct jz4740_request *req;
+
+	DEBUG("%s, %p\n", __FUNCTION__, ep);
+
+	/* Flush FIFO */
+	flush(ep);
+
+	/* called with irqs blocked */
+	while (!list_empty(&ep->queue)) {
+		req = list_entry(ep->queue.next, struct jz4740_request, queue);
+		done(ep, req, status);
+	}
+
+	/* Disable IRQ if EP is enabled (has descriptor) */
+	if (ep->desc)
+		pio_irq_disable(ep);
+}
+
+/** Flush EP FIFO
+ * NOTE: INDEX register must be set before this call
+ */
+static void flush(struct jz4740_ep *ep)
+{
+	DEBUG("%s: %s\n", __FUNCTION__, ep->ep.name);
+
+	switch (ep->type) {
+	case ep_bulk_in:
+	case ep_interrupt:
+		usb_setb(ep->dev, ep->csr, USB_INCSR_FF);
+		break;
+	case ep_bulk_out:
+		usb_setb(ep->dev, ep->csr, USB_OUTCSR_FF);
+		break;
+	case ep_control:
+		break;
+	}
+}
+
+/**
+ * jz4740_in_epn - handle IN interrupt
+ */
+static void jz4740_in_epn(struct jz4740_udc *dev, uint32_t ep_idx, uint32_t intr)
+{
+	uint32_t csr;
+	struct jz4740_ep *ep = &dev->ep[ep_idx + 1];
+	struct jz4740_request *req;
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	jz_udc_set_index(dev, ep_index(ep));
+
+	csr = usb_readb(dev, ep->csr);
+	DEBUG("%s: %d, csr %x\n", __FUNCTION__, ep_idx, csr);
+
+	if (csr & USB_INCSR_SENTSTALL) {
+		DEBUG("USB_INCSR_SENTSTALL\n");
+		usb_clearb(dev, ep->csr, USB_INCSR_SENTSTALL);
+		return;
+	}
+
+	if (!ep->desc) {
+		DEBUG("%s: NO EP DESC\n", __FUNCTION__);
+		return;
+	}
+
+	if (list_empty(&ep->queue))
+		req = 0;
+	else
+		req = list_entry(ep->queue.next, struct jz4740_request, queue);
+
+	DEBUG("req: %p\n", req);
+
+	if (!req)
+		return;
+
+	write_fifo(ep, req);
+}
+
+/*
+ * Bulk OUT (recv)
+ */
+static void jz4740_out_epn(struct jz4740_udc *dev, uint32_t ep_idx, uint32_t intr)
+{
+	struct jz4740_ep *ep = &dev->ep[ep_idx];
+	struct jz4740_request *req;
+
+	DEBUG("%s: %d\n", __FUNCTION__, ep_idx);
+
+	jz_udc_set_index(dev, ep_index(ep));
+	if (ep->desc) {
+		uint32_t csr;
+
+		if (use_dma) {
+			/* DMA starts here ... */
+			if (list_empty(&ep->queue))
+				req = 0;
+			else
+				req = list_entry(ep->queue.next, struct jz4740_request, queue);
+
+			if (req)
+				read_fifo(ep, req);
+			return;
+		}
+
+		/*
+		 * PIO mode starts here ...
+		 */
+
+		while ((csr = usb_readb(dev, ep->csr)) &
+		       (USB_OUTCSR_OUTPKTRDY | USB_OUTCSR_SENTSTALL)) {
+			DEBUG("%s: %x\n", __FUNCTION__, csr);
+
+			if (csr & USB_OUTCSR_SENTSTALL) {
+				DEBUG("%s: stall sent, flush fifo\n",
+				      __FUNCTION__);
+				/* usb_set(USB_OUT_CSR1_FIFO_FLUSH, ep->csr1); */
+				flush(ep);
+			} else if (csr & USB_OUTCSR_OUTPKTRDY) {
+				if (list_empty(&ep->queue))
+					req = 0;
+				else
+					req =
+						list_entry(ep->queue.next,
+							   struct jz4740_request,
+							   queue);
+
+				if (!req) {
+					DEBUG("%s: NULL REQ %d\n",
+					      __FUNCTION__, ep_idx);
+					break;
+				} else {
+					read_fifo(ep, req);
+				}
+			}
+		}
+	} else {
+		/* Throw packet away.. */
+		DEBUG("%s: ep %p ep_indx %d No descriptor?!?\n", __FUNCTION__, ep, ep_idx);
+		flush(ep);
+	}
+}
+
+/** Halt specific EP
+ *  Return 0 if success
+ *  NOTE: Sets INDEX register to EP !
+ */
+static int jz4740_set_halt(struct usb_ep *_ep, int value)
+{
+	struct jz4740_udc *dev;
+	struct jz4740_ep *ep;
+	unsigned long flags;
+
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	ep = container_of(_ep, struct jz4740_ep, ep);
+	if (unlikely(!_ep || (!ep->desc && ep->type != ep_control))) {
+		DEBUG("%s, bad ep\n", __FUNCTION__);
+		return -EINVAL;
+	}
+
+	dev = ep->dev;
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	jz_udc_select_ep(ep);
+
+	DEBUG("%s, ep %d, val %d\n", __FUNCTION__, ep_index(ep), value);
+
+	if (ep_index(ep) == 0) {
+		/* EP0 */
+		usb_setb(dev, JZ_REG_UDC_CSR0, USB_CSR0_SENDSTALL);
+	} else if (ep_is_in(ep)) {
+		uint32_t csr = usb_readb(dev, ep->csr);
+		if (value && ((csr & USB_INCSR_FFNOTEMPT)
+			      || !list_empty(&ep->queue))) {
+			/*
+			 * Attempts to halt IN endpoints will fail (returning -EAGAIN)
+			 * if any transfer requests are still queued, or if the controller
+			 * FIFO still holds bytes that the host hasn’t collected.
+			 */
+			spin_unlock_irqrestore(&dev->lock, flags);
+			DEBUG
+			    ("Attempt to halt IN endpoint failed (returning -EAGAIN) %d %d\n",
+			     (csr & USB_INCSR_FFNOTEMPT),
+			     !list_empty(&ep->queue));
+			return -EAGAIN;
+		}
+		flush(ep);
+		if (value) {
+			usb_setb(dev, ep->csr, USB_INCSR_SENDSTALL);
+		}
+		else {
+			usb_clearb(dev, ep->csr, USB_INCSR_SENDSTALL);
+			usb_setb(dev, ep->csr, USB_INCSR_CDT);
+		}
+	} else {
+
+		flush(ep);
+		if (value) {
+			usb_setb(dev, ep->csr, USB_OUTCSR_SENDSTALL);
+		}
+		else {
+			usb_clearb(dev, ep->csr, USB_OUTCSR_SENDSTALL);
+			usb_setb(dev, ep->csr, USB_OUTCSR_CDT);
+		}
+	}
+
+	if (value) {
+		ep->stopped = 1;
+	} else {
+		ep->stopped = 0;
+	}
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	DEBUG("%s %s halted\n", _ep->name, value == 0 ? "NOT" : "IS");
+
+	return 0;
+}
+
+
+static int jz4740_ep_enable(struct usb_ep *_ep,
+			    const struct usb_endpoint_descriptor *desc)
+{
+	struct jz4740_ep *ep;
+	struct jz4740_udc *dev;
+	unsigned long flags;
+	uint32_t max, csrh = 0;
+
+	DEBUG("%s: trying to enable %s\n", __FUNCTION__, _ep->name);
+
+	if (!_ep || !desc)
+		return -EINVAL;
+
+	ep = container_of(_ep, struct jz4740_ep, ep);
+	if (ep->desc || ep->type == ep_control
+	    || desc->bDescriptorType != USB_DT_ENDPOINT
+	    || ep->bEndpointAddress != desc->bEndpointAddress) {
+		DEBUG("%s, bad ep or descriptor\n", __FUNCTION__);
+		return -EINVAL;
+	}
+
+	/* xfer types must match, except that interrupt ~= bulk */
+	if (ep->bmAttributes != desc->bmAttributes
+	    && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
+	    && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
+		DEBUG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
+		return -EINVAL;
+	}
+
+	dev = ep->dev;
+	if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
+		DEBUG("%s, bogus device state\n", __FUNCTION__);
+		return -ESHUTDOWN;
+	}
+
+	max = le16_to_cpu(desc->wMaxPacketSize);
+
+	spin_lock_irqsave(&ep->dev->lock, flags);
+
+	/* Configure the endpoint */
+	jz_udc_set_index(dev, desc->bEndpointAddress & 0x0F);
+	if (ep_is_in(ep)) {
+		usb_writew(dev, JZ_REG_UDC_INMAXP, max);
+		switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+		case USB_ENDPOINT_XFER_BULK:
+		case USB_ENDPOINT_XFER_INT:
+			csrh &= ~USB_INCSRH_ISO;
+			break;
+		case USB_ENDPOINT_XFER_ISOC:
+			csrh |= USB_INCSRH_ISO;
+			break;
+		}
+		usb_writeb(dev, JZ_REG_UDC_INCSRH, csrh);
+	}
+	else {
+		usb_writew(dev, JZ_REG_UDC_OUTMAXP, max);
+		switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+		case USB_ENDPOINT_XFER_BULK:
+			 csrh &= ~USB_OUTCSRH_ISO;
+			break;
+		case USB_ENDPOINT_XFER_INT:
+			csrh &= ~USB_OUTCSRH_ISO;
+			csrh |= USB_OUTCSRH_DNYT;
+			break;
+		case USB_ENDPOINT_XFER_ISOC:
+			csrh |= USB_OUTCSRH_ISO;
+			break;
+		}
+		usb_writeb(dev, JZ_REG_UDC_OUTCSRH, csrh);
+	}
+
+
+	ep->stopped = 0;
+	ep->desc = desc;
+	ep->pio_irqs = 0;
+	ep->ep.maxpacket = max;
+
+	spin_unlock_irqrestore(&ep->dev->lock, flags);
+
+	/* Reset halt state (does flush) */
+	jz4740_set_halt(_ep, 0);
+
+	DEBUG("%s: enabled %s\n", __FUNCTION__, _ep->name);
+
+	return 0;
+}
+
+/** Disable EP
+ *  NOTE: Sets INDEX register
+ */
+static int jz4740_ep_disable(struct usb_ep *_ep)
+{
+	struct jz4740_ep *ep;
+	unsigned long flags;
+
+	DEBUG("%s, %p\n", __FUNCTION__, _ep);
+
+	ep = container_of(_ep, struct jz4740_ep, ep);
+	if (!_ep || !ep->desc) {
+		DEBUG("%s, %s not enabled\n", __FUNCTION__,
+		      _ep ? ep->ep.name : NULL);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&ep->dev->lock, flags);
+
+	jz_udc_select_ep(ep);
+
+	/* Nuke all pending requests (does flush) */
+	nuke(ep, -ESHUTDOWN);
+
+	/* Disable ep IRQ */
+	pio_irq_disable(ep);
+
+	ep->desc = 0;
+	ep->stopped = 1;
+
+	spin_unlock_irqrestore(&ep->dev->lock, flags);
+
+	DEBUG("%s: disabled %s\n", __FUNCTION__, _ep->name);
+	return 0;
+}
+
+static struct usb_request *jz4740_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
+{
+	struct jz4740_request *req;
+
+	DEBUG("%s, %p\n", __FUNCTION__, ep);
+
+	req = kzalloc(sizeof(*req), gfp_flags);
+	if (!req)
+		return 0;
+
+	INIT_LIST_HEAD(&req->queue);
+
+	return &req->req;
+}
+
+static void jz4740_free_request(struct usb_ep *ep, struct usb_request *_req)
+{
+	struct jz4740_request *req;
+
+	DEBUG("%s, %p\n", __FUNCTION__, ep);
+
+	req = container_of(_req, struct jz4740_request, req);
+	WARN_ON(!list_empty(&req->queue));
+	kfree(req);
+}
+
+/*--------------------------------------------------------------------*/
+
+/** Queue one request
+ *  Kickstart transfer if needed
+ *  NOTE: Sets INDEX register
+ */
+static int jz4740_queue(struct usb_ep *_ep, struct usb_request *_req,
+			gfp_t gfp_flags)
+{
+	struct jz4740_request *req;
+	struct jz4740_ep *ep;
+	struct jz4740_udc *dev;
+
+	DEBUG("%s, %p\n", __FUNCTION__, _ep);
+
+	req = container_of(_req, struct jz4740_request, req);
+	if (unlikely
+	    (!_req || !_req->complete || !_req->buf
+	     || !list_empty(&req->queue))) {
+		DEBUG("%s, bad params\n", __FUNCTION__);
+		return -EINVAL;
+	}
+
+	ep = container_of(_ep, struct jz4740_ep, ep);
+	if (unlikely(!_ep || (!ep->desc && ep->type != ep_control))) {
+		DEBUG("%s, bad ep\n", __FUNCTION__);
+		return -EINVAL;
+	}
+
+	dev = ep->dev;
+	if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
+		DEBUG("%s, bogus device state %p\n", __FUNCTION__, dev->driver);
+		return -ESHUTDOWN;
+	}
+
+	DEBUG("%s queue req %p, len %d buf %p\n", _ep->name, _req, _req->length,
+	      _req->buf);
+
+	spin_lock_irqsave(&dev->lock, dev->lock_flags);
+
+	_req->status = -EINPROGRESS;
+	_req->actual = 0;
+
+	/* kickstart this i/o queue? */
+	DEBUG("Add to %d Q %d %d\n", ep_index(ep), list_empty(&ep->queue),
+	      ep->stopped);
+	if (list_empty(&ep->queue) && likely(!ep->stopped)) {
+		uint32_t csr;
+
+		if (unlikely(ep_index(ep) == 0)) {
+			/* EP0 */
+			list_add_tail(&req->queue, &ep->queue);
+			jz4740_ep0_kick(dev, ep);
+			req = 0;
+		} else if (use_dma) {
+			/* DMA */
+			kick_dma(ep, req);
+		}
+		/* PIO */
+		else if (ep_is_in(ep)) {
+			/* EP1 & EP2 */
+			jz_udc_set_index(dev, ep_index(ep));
+			csr = usb_readb(dev, ep->csr);
+			pio_irq_enable(ep);
+			if (!(csr & USB_INCSR_FFNOTEMPT)) {
+				if (write_fifo(ep, req) == 1)
+					req = 0;
+			}
+		} else {
+			/* EP1 */
+			jz_udc_set_index(dev, ep_index(ep));
+			csr = usb_readb(dev, ep->csr);
+			pio_irq_enable(ep);
+			if (csr & USB_OUTCSR_OUTPKTRDY) {
+				if (read_fifo(ep, req) == 1)
+					req = 0;
+			}
+		}
+	}
+
+	/* pio or dma irq handler advances the queue. */
+	if (likely(req != 0))
+		list_add_tail(&req->queue, &ep->queue);
+
+	spin_unlock_irqrestore(&dev->lock, dev->lock_flags);
+
+	return 0;
+}
+
+/* dequeue JUST ONE request */
+static int jz4740_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct jz4740_ep *ep;
+	struct jz4740_request *req;
+	unsigned long flags;
+
+	DEBUG("%s, %p\n", __FUNCTION__, _ep);
+
+	ep = container_of(_ep, struct jz4740_ep, ep);
+	if (!_ep || ep->type == ep_control)
+		return -EINVAL;
+
+	spin_lock_irqsave(&ep->dev->lock, flags);
+
+	/* make sure it's actually queued on this endpoint */
+	list_for_each_entry(req, &ep->queue, queue) {
+		if (&req->req == _req)
+			break;
+	}
+	if (&req->req != _req) {
+		spin_unlock_irqrestore(&ep->dev->lock, flags);
+		return -EINVAL;
+	}
+	done(ep, req, -ECONNRESET);
+
+	spin_unlock_irqrestore(&ep->dev->lock, flags);
+	return 0;
+}
+
+/** Return bytes in EP FIFO
+ *  NOTE: Sets INDEX register to EP
+ */
+static int jz4740_fifo_status(struct usb_ep *_ep)
+{
+	uint32_t csr;
+	int count = 0;
+	struct jz4740_ep *ep;
+	unsigned long flags;
+
+	ep = container_of(_ep, struct jz4740_ep, ep);
+	if (!_ep) {
+		DEBUG("%s, bad ep\n", __FUNCTION__);
+		return -ENODEV;
+	}
+
+	DEBUG("%s, %d\n", __FUNCTION__, ep_index(ep));
+
+	/* LPD can't report unclaimed bytes from IN fifos */
+	if (ep_is_in(ep))
+		return -EOPNOTSUPP;
+
+	spin_lock_irqsave(&ep->dev->lock, flags);
+	jz_udc_set_index(ep->dev, ep_index(ep));
+
+	csr = usb_readb(ep->dev, ep->csr);
+	if (ep->dev->gadget.speed != USB_SPEED_UNKNOWN ||
+	    csr & 0x1) {
+		count = usb_readw(ep->dev, JZ_REG_UDC_OUTCOUNT);
+	}
+
+	spin_unlock_irqrestore(&ep->dev->lock, flags);
+
+	return count;
+}
+
+/** Flush EP FIFO
+ *  NOTE: Sets INDEX register to EP
+ */
+static void jz4740_fifo_flush(struct usb_ep *_ep)
+{
+	struct jz4740_ep *ep;
+	unsigned long flags;
+
+	DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	ep = container_of(_ep, struct jz4740_ep, ep);
+	if (unlikely(!_ep || (!ep->desc && ep->type == ep_control))) {
+		DEBUG("%s, bad ep\n", __FUNCTION__);
+		return;
+	}
+
+	spin_lock_irqsave(&ep->dev->lock, flags);
+
+	jz_udc_set_index(ep->dev, ep_index(ep));
+	flush(ep);
+
+	spin_unlock_irqrestore(&ep->dev->lock, flags);
+}
+
+/****************************************************************/
+/* End Point 0 related functions                                */
+/****************************************************************/
+
+/* return:  0 = still running, 1 = completed, negative = errno */
+static int write_fifo_ep0(struct jz4740_ep *ep, struct jz4740_request *req)
+{
+	uint32_t max;
+	unsigned count;
+	int is_last;
+
+    DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+	max = ep_maxpacket(ep);
+
+	count = write_packet(ep, req, max);
+
+	/* last packet is usually short (or a zlp) */
+	if (unlikely(count != max))
+		is_last = 1;
+	else {
+		if (likely(req->req.length != req->req.actual) || req->req.zero)
+			is_last = 0;
+		else
+			is_last = 1;
+	}
+
+	DEBUG_EP0("%s: wrote %s %d bytes%s %d left %p\n", __FUNCTION__,
+		  ep->ep.name, count,
+		  is_last ? "/L" : "", req->req.length - req->req.actual, req);
+
+	/* requests complete when all IN data is in the FIFO */
+	if (is_last) {
+		done(ep, req, 0);
+		return 1;
+	}
+
+	return 0;
+}
+
+static inline int jz4740_fifo_read(struct jz4740_ep *ep,
+				       unsigned char *cp, int max)
+{
+	int bytes;
+	int count = usb_readw(ep->dev, JZ_REG_UDC_OUTCOUNT);
+
+	if (count > max)
+		count = max;
+	bytes = count;
+	while (count--)
+		*cp++ = usb_readb(ep->dev, ep->fifo);
+
+	return bytes;
+}
+
+static inline void jz4740_fifo_write(struct jz4740_ep *ep,
+					 unsigned char *cp, int count)
+{
+	DEBUG("fifo_write: %d %d\n", ep_index(ep), count);
+	while (count--)
+		usb_writeb(ep->dev, ep->fifo, *cp++);
+}
+
+static int read_fifo_ep0(struct jz4740_ep *ep, struct jz4740_request *req)
+{
+	struct jz4740_udc *dev = ep->dev;
+	uint32_t csr;
+	uint8_t *buf;
+	unsigned bufferspace, count, is_short;
+
+	DEBUG_EP0("%s\n", __FUNCTION__);
+
+	csr = usb_readb(dev, JZ_REG_UDC_CSR0);
+	if (!(csr & USB_CSR0_OUTPKTRDY))
+		return 0;
+
+	buf = req->req.buf + req->req.actual;
+	prefetchw(buf);
+	bufferspace = req->req.length - req->req.actual;
+
+	/* read all bytes from this packet */
+	if (likely(csr & USB_CSR0_OUTPKTRDY)) {
+		count = usb_readw(dev, JZ_REG_UDC_OUTCOUNT);
+		req->req.actual += min(count, bufferspace);
+	} else			/* zlp */
+		count = 0;
+
+	is_short = (count < ep->ep.maxpacket);
+	DEBUG_EP0("read %s %02x, %d bytes%s req %p %d/%d\n",
+		  ep->ep.name, csr, count,
+		  is_short ? "/S" : "", req, req->req.actual, req->req.length);
+
+	while (likely(count-- != 0)) {
+		uint8_t byte = (uint8_t)usb_readl(dev, ep->fifo);
+
+		if (unlikely(bufferspace == 0)) {
+			/* this happens when the driver's buffer
+			 * is smaller than what the host sent.
+			 * discard the extra data.
+			 */
+			if (req->req.status != -EOVERFLOW)
+				DEBUG_EP0("%s overflow %d\n", ep->ep.name,
+					  count);
+			req->req.status = -EOVERFLOW;
+		} else {
+			*buf++ = byte;
+			bufferspace--;
+		}
+	}
+
+	/* completion */
+	if (is_short || req->req.actual == req->req.length) {
+		done(ep, req, 0);
+		return 1;
+	}
+
+	/* finished that packet.  the next one may be waiting... */
+	return 0;
+}
+
+/**
+ * udc_set_address - set the USB address for this device
+ * @address:
+ *
+ * Called from control endpoint function after it decodes a set address setup packet.
+ */
+static void udc_set_address(struct jz4740_udc *dev, unsigned char address)
+{
+	DEBUG_EP0("%s: %d\n", __FUNCTION__, address);
+
+	dev->usb_address = address;
+	usb_writeb(dev, JZ_REG_UDC_FADDR, address);
+}
+
+/*
+ * DATA_STATE_RECV (USB_CSR0_OUTPKTRDY)
+ *      - if error
+ *              set USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND | USB_CSR0_SENDSTALL bits
+ *      - else
+ *              set USB_CSR0_SVDOUTPKTRDY bit
+ 				if last set USB_CSR0_DATAEND bit
+ */
+static void jz4740_ep0_out(struct jz4740_udc *dev, uint32_t csr, int kickstart)
+{
+	struct jz4740_request *req;
+	struct jz4740_ep *ep = &dev->ep[0];
+	int ret;
+
+	DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
+
+	if (list_empty(&ep->queue))
+		req = 0;
+	else
+		req = list_entry(ep->queue.next, struct jz4740_request, queue);
+
+	if (req) {
+		if (req->req.length == 0) {
+			DEBUG_EP0("ZERO LENGTH OUT!\n");
+			usb_setb(dev, JZ_REG_UDC_CSR0, (USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND));
+			dev->ep0state = WAIT_FOR_SETUP;
+			return;
+		} else if (kickstart) {
+			usb_setb(dev, JZ_REG_UDC_CSR0, (USB_CSR0_SVDOUTPKTRDY));
+			return;
+		}
+		ret = read_fifo_ep0(ep, req);
+		if (ret) {
+			/* Done! */
+			DEBUG_EP0("%s: finished, waiting for status\n",
+				  __FUNCTION__);
+			usb_setb(dev, JZ_REG_UDC_CSR0, (USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND));
+			dev->ep0state = WAIT_FOR_SETUP;
+		} else {
+			/* Not done yet.. */
+			DEBUG_EP0("%s: not finished\n", __FUNCTION__);
+			usb_setb(dev, JZ_REG_UDC_CSR0, USB_CSR0_SVDOUTPKTRDY);
+		}
+	} else {
+		DEBUG_EP0("NO REQ??!\n");
+	}
+}
+
+/*
+ * DATA_STATE_XMIT
+ */
+static int jz4740_ep0_in(struct jz4740_udc *dev, uint32_t csr)
+{
+	struct jz4740_request *req;
+	struct jz4740_ep *ep = &dev->ep[0];
+	int ret, need_zlp = 0;
+
+	DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
+
+	if (list_empty(&ep->queue))
+		req = 0;
+	else
+		req = list_entry(ep->queue.next, struct jz4740_request, queue);
+
+	if (!req) {
+		DEBUG_EP0("%s: NULL REQ\n", __FUNCTION__);
+		return 0;
+	}
+
+	if (req->req.length == 0) {
+		usb_setb(dev, JZ_REG_UDC_CSR0, (USB_CSR0_INPKTRDY | USB_CSR0_DATAEND));
+		dev->ep0state = WAIT_FOR_SETUP;
+		return 1;
+	}
+
+	if (req->req.length - req->req.actual == EP0_MAXPACKETSIZE) {
+		/* Next write will end with the packet size, */
+		/* so we need zero-length-packet */
+		need_zlp = 1;
+	}
+
+	ret = write_fifo_ep0(ep, req);
+
+	if (ret == 1 && !need_zlp) {
+		/* Last packet */
+		DEBUG_EP0("%s: finished, waiting for status\n", __FUNCTION__);
+
+		usb_setb(dev, JZ_REG_UDC_CSR0, (USB_CSR0_INPKTRDY | USB_CSR0_DATAEND));
+		dev->ep0state = WAIT_FOR_SETUP;
+	} else {
+		DEBUG_EP0("%s: not finished\n", __FUNCTION__);
+		usb_setb(dev, JZ_REG_UDC_CSR0, USB_CSR0_INPKTRDY);
+	}
+
+	if (need_zlp) {
+		DEBUG_EP0("%s: Need ZLP!\n", __FUNCTION__);
+		usb_setb(dev, JZ_REG_UDC_CSR0, USB_CSR0_INPKTRDY);
+		dev->ep0state = DATA_STATE_NEED_ZLP;
+	}
+
+	return 1;
+}
+
+static int jz4740_handle_get_status(struct jz4740_udc *dev,
+				    struct usb_ctrlrequest *ctrl)
+{
+	struct jz4740_ep *ep0 = &dev->ep[0];
+	struct jz4740_ep *qep;
+	int reqtype = (ctrl->bRequestType & USB_RECIP_MASK);
+	uint16_t val = 0;
+
+    DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+
+	if (reqtype == USB_RECIP_INTERFACE) {
+		/* This is not supported.
+		 * And according to the USB spec, this one does nothing..
+		 * Just return 0
+		 */
+		DEBUG_SETUP("GET_STATUS: USB_RECIP_INTERFACE\n");
+	} else if (reqtype == USB_RECIP_DEVICE) {
+		DEBUG_SETUP("GET_STATUS: USB_RECIP_DEVICE\n");
+		val |= (1 << 0);	/* Self powered */
+		/*val |= (1<<1); *//* Remote wakeup */
+	} else if (reqtype == USB_RECIP_ENDPOINT) {
+		int ep_num = (ctrl->wIndex & ~USB_DIR_IN);
+
+		DEBUG_SETUP
+			("GET_STATUS: USB_RECIP_ENDPOINT (%d), ctrl->wLength = %d\n",
+			 ep_num, ctrl->wLength);
+
+		if (ctrl->wLength > 2 || ep_num > 3)
+			return -EOPNOTSUPP;
+
+		qep = &dev->ep[ep_num];
+		if (ep_is_in(qep) != ((ctrl->wIndex & USB_DIR_IN) ? 1 : 0)
+		    && ep_index(qep) != 0) {
+			return -EOPNOTSUPP;
+		}
+
+		jz_udc_set_index(dev, ep_index(qep));
+
+		/* Return status on next IN token */
+		switch (qep->type) {
+		case ep_control:
+			val =
+			    (usb_readb(dev, qep->csr) & USB_CSR0_SENDSTALL) ==
+			    USB_CSR0_SENDSTALL;
+			break;
+		case ep_bulk_in:
+		case ep_interrupt:
+			val =
+			    (usb_readb(dev, qep->csr) & USB_INCSR_SENDSTALL) ==
+			    USB_INCSR_SENDSTALL;
+			break;
+		case ep_bulk_out:
+			val =
+			    (usb_readb(dev, qep->csr) & USB_OUTCSR_SENDSTALL) ==
+			    USB_OUTCSR_SENDSTALL;
+			break;
+		}
+
+		/* Back to EP0 index */
+		jz_udc_set_index(dev, 0);
+
+		DEBUG_SETUP("GET_STATUS, ep: %d (%x), val = %d\n", ep_num,
+			    ctrl->wIndex, val);
+	} else {
+		DEBUG_SETUP("Unknown REQ TYPE: %d\n", reqtype);
+		return -EOPNOTSUPP;
+	}
+
+	/* Clear "out packet ready" */
+	usb_setb(dev, JZ_REG_UDC_CSR0, USB_CSR0_SVDOUTPKTRDY);
+	/* Put status to FIFO */
+	jz4740_fifo_write(ep0, (uint8_t *)&val, sizeof(val));
+	/* Issue "In packet ready" */
+	usb_setb(dev, JZ_REG_UDC_CSR0, (USB_CSR0_INPKTRDY | USB_CSR0_DATAEND));
+
+	return 0;
+}
+
+/*
+ * WAIT_FOR_SETUP (OUTPKTRDY)
+ *      - read data packet from EP0 FIFO
+ *      - decode command
+ *      - if error
+ *              set USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND | USB_CSR0_SENDSTALL bits
+ *      - else
+ *              set USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND bits
+ */
+static void jz4740_ep0_setup(struct jz4740_udc *dev, uint32_t csr)
+{
+	struct jz4740_ep *ep = &dev->ep[0];
+	struct usb_ctrlrequest ctrl;
+	int i;
+
+	DEBUG_SETUP("%s: %x\n", __FUNCTION__, csr);
+
+	/* Nuke all previous transfers */
+	nuke(ep, -EPROTO);
+
+	/* read control req from fifo (8 bytes) */
+	jz4740_fifo_read(ep, (unsigned char *)&ctrl, 8);
+
+	DEBUG_SETUP("SETUP %02x.%02x v%04x i%04x l%04x\n",
+		    ctrl.bRequestType, ctrl.bRequest,
+		    ctrl.wValue, ctrl.wIndex, ctrl.wLength);
+
+	/* Set direction of EP0 */
+	if (likely(ctrl.bRequestType & USB_DIR_IN)) {
+		ep->bEndpointAddress |= USB_DIR_IN;
+	} else {
+		ep->bEndpointAddress &= ~USB_DIR_IN;
+	}
+
+	/* Handle some SETUP packets ourselves */
+	switch (ctrl.bRequest) {
+	case USB_REQ_SET_ADDRESS:
+		if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE))
+			break;
+
+		DEBUG_SETUP("USB_REQ_SET_ADDRESS (%d)\n", ctrl.wValue);
+		udc_set_address(dev, ctrl.wValue);
+		usb_setb(dev, JZ_REG_UDC_CSR0, (USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND));
+		return;
+
+	case USB_REQ_SET_CONFIGURATION:
+		if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE))
+			break;
+
+		DEBUG_SETUP("USB_REQ_SET_CONFIGURATION (%d)\n", ctrl.wValue);
+/*		usb_setb(JZ_REG_UDC_CSR0, (USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND));*/
+
+		/* Enable RESUME and SUSPEND interrupts */
+		usb_setb(dev, JZ_REG_UDC_INTRUSBE, (USB_INTR_RESUME | USB_INTR_SUSPEND));
+		break;
+
+	case USB_REQ_SET_INTERFACE:
+		if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE))
+			break;
+
+		DEBUG_SETUP("USB_REQ_SET_INTERFACE (%d)\n", ctrl.wValue);
+/*		usb_setb(JZ_REG_UDC_CSR0, (USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND));*/
+		break;
+
+	case USB_REQ_GET_STATUS:
+		if (jz4740_handle_get_status(dev, &ctrl) == 0)
+			return;
+
+	case USB_REQ_CLEAR_FEATURE:
+	case USB_REQ_SET_FEATURE:
+		if (ctrl.bRequestType == USB_RECIP_ENDPOINT) {
+			struct jz4740_ep *qep;
+			int ep_num = (ctrl.wIndex & 0x0f);
+
+			/* Support only HALT feature */
+			if (ctrl.wValue != 0 || ctrl.wLength != 0
+			    || ep_num > 3 || ep_num < 1)
+				break;
+
+			qep = &dev->ep[ep_num];
+			spin_unlock(&dev->lock);
+			if (ctrl.bRequest == USB_REQ_SET_FEATURE) {
+				DEBUG_SETUP("SET_FEATURE (%d)\n",
+					    ep_num);
+				jz4740_set_halt(&qep->ep, 1);
+			} else {
+				DEBUG_SETUP("CLR_FEATURE (%d)\n",
+					    ep_num);
+				jz4740_set_halt(&qep->ep, 0);
+			}
+			spin_lock(&dev->lock);
+
+			jz_udc_set_index(dev, 0);
+
+			/* Reply with a ZLP on next IN token */
+			usb_setb(dev, JZ_REG_UDC_CSR0,
+				 (USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND));
+			return;
+		}
+		break;
+
+	default:
+		break;
+	}
+
+	/* gadget drivers see class/vendor specific requests,
+	 * {SET,GET}_{INTERFACE,DESCRIPTOR,CONFIGURATION},
+	 * and more.
+	 */
+	if (dev->driver) {
+		/* device-2-host (IN) or no data setup command, process immediately */
+		spin_unlock(&dev->lock);
+
+		i = dev->driver->setup(&dev->gadget, &ctrl);
+		spin_lock(&dev->lock);
+
+		if (unlikely(i < 0)) {
+			/* setup processing failed, force stall */
+			DEBUG_SETUP
+			    ("  --> ERROR: gadget setup FAILED (stalling), setup returned %d\n",
+			     i);
+			jz_udc_set_index(dev, 0);
+			usb_setb(dev, JZ_REG_UDC_CSR0, (USB_CSR0_SVDOUTPKTRDY | USB_CSR0_DATAEND | USB_CSR0_SENDSTALL));
+
+			/* ep->stopped = 1; */
+			dev->ep0state = WAIT_FOR_SETUP;
+		}
+		else {
+			DEBUG_SETUP("gadget driver setup ok (%d)\n", ctrl.wLength);
+/*			if (!ctrl.wLength) {
+				usb_setb(JZ_REG_UDC_CSR0, USB_CSR0_SVDOUTPKTRDY);
+			}*/
+		}
+	}
+}
+
+/*
+ * DATA_STATE_NEED_ZLP
+ */
+static void jz4740_ep0_in_zlp(struct jz4740_udc *dev, uint32_t csr)
+{
+	DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
+
+	usb_setb(dev, JZ_REG_UDC_CSR0, (USB_CSR0_INPKTRDY | USB_CSR0_DATAEND));
+	dev->ep0state = WAIT_FOR_SETUP;
+}
+
+/*
+ * handle ep0 interrupt
+ */
+static void jz4740_handle_ep0(struct jz4740_udc *dev, uint32_t intr)
+{
+	struct jz4740_ep *ep = &dev->ep[0];
+	uint32_t csr;
+
+    DEBUG("%s:%s[%d]\n", __FILE__, __func__, __LINE__);
+	/* Set index 0 */
+	jz_udc_set_index(dev, 0);
+	csr = usb_readb(dev, JZ_REG_UDC_CSR0);
+
+	DEBUG_EP0("%s: csr = %x  state = \n", __FUNCTION__, csr);//, state_names[dev->ep0state]);
+
+	/*
+	 * if SENT_STALL is set
+	 *      - clear the SENT_STALL bit
+	 */
+	if (csr & USB_CSR0_SENTSTALL) {
+		DEBUG_EP0("%s: USB_CSR0_SENTSTALL is set: %x\n", __FUNCTION__, csr);
+		usb_clearb(dev, JZ_REG_UDC_CSR0, USB_CSR0_SENDSTALL | USB_CSR0_SENTSTALL);
+		nuke(ep, -ECONNABORTED);
+		dev->ep0state = WAIT_FOR_SETUP;
+		return;
+	}
+
+	/*
+	 * if a transfer is in progress && INPKTRDY and OUTPKTRDY are clear
+	 *      - fill EP0 FIFO
+	 *      - if last packet
+	 *      -       set IN_PKT_RDY | DATA_END
+	 *      - else
+	 *              set IN_PKT_RDY
+	 */
+	if (!(csr & (USB_CSR0_INPKTRDY | USB_CSR0_OUTPKTRDY))) {
+		DEBUG_EP0("%s: INPKTRDY and OUTPKTRDY are clear\n",
+			  __FUNCTION__);
+
+		switch (dev->ep0state) {
+		case DATA_STATE_XMIT:
+			DEBUG_EP0("continue with DATA_STATE_XMIT\n");
+			jz4740_ep0_in(dev, csr);
+			return;
+		case DATA_STATE_NEED_ZLP:
+			DEBUG_EP0("continue with DATA_STATE_NEED_ZLP\n");
+			jz4740_ep0_in_zlp(dev, csr);
+			return;
+		default:
+			/* Stall? */
+//			DEBUG_EP0("Odd state!! state = %s\n",
+//				  state_names[dev->ep0state]);
+			dev->ep0state = WAIT_FOR_SETUP;
+			/* nuke(ep, 0); */
+			/* usb_setb(ep->csr, USB_CSR0_SENDSTALL); */
+//			break;
+			return;
+		}
+	}
+
+	/*
+	 * if SETUPEND is set
+	 *      - abort the last transfer
+	 *      - set SERVICED_SETUP_END_BIT
+	 */
+	if (csr & USB_CSR0_SETUPEND) {
+		DEBUG_EP0("%s: USB_CSR0_SETUPEND is set: %x\n", __FUNCTION__, csr);
+
+		usb_setb(dev, JZ_REG_UDC_CSR0, USB_CSR0_SVDSETUPEND);
+		nuke(ep, 0);
+		dev->ep0state = WAIT_FOR_SETUP;
+	}
+
+	/*
+	 * if USB_CSR0_OUTPKTRDY is set
+	 *      - read data packet from EP0 FIFO
+	 *      - decode command
+	 *      - if error
+	 *              set SVDOUTPKTRDY | DATAEND | SENDSTALL bits
+	 *      - else
+	 *              set SVDOUTPKTRDY | DATAEND bits
+	 */
+	if (csr & USB_CSR0_OUTPKTRDY) {
+
+		DEBUG_EP0("%s: EP0_OUT_PKT_RDY is set: %x\n", __FUNCTION__,
+			  csr);
+
+		switch (dev->ep0state) {
+		case WAIT_FOR_SETUP:
+			DEBUG_EP0("WAIT_FOR_SETUP\n");
+			jz4740_ep0_setup(dev, csr);
+			break;
+
+		case DATA_STATE_RECV:
+			DEBUG_EP0("DATA_STATE_RECV\n");
+			jz4740_ep0_out(dev, csr, 0);
+			break;
+
+		default:
+			/* send stall? */
+			DEBUG_EP0("strange state!! 2. send stall? state = %d\n",
+				  dev->ep0state);
+			break;
+		}
+	}
+}
+
+static void jz4740_ep0_kick(struct jz4740_udc *dev, struct jz4740_ep *ep)
+{
+	uint32_t csr;
+
+	jz_udc_set_index(dev, 0);
+
+	DEBUG_EP0("%s: %x\n", __FUNCTION__, csr);
+
+	/* Clear "out packet ready" */
+
+	if (ep_is_in(ep)) {
+		usb_setb(dev, JZ_REG_UDC_CSR0, USB_CSR0_SVDOUTPKTRDY);
+		csr = usb_readb(dev, JZ_REG_UDC_CSR0);
+		dev->ep0state = DATA_STATE_XMIT;
+		jz4740_ep0_in(dev, csr);
+	} else {
+		csr = usb_readb(dev, JZ_REG_UDC_CSR0);
+		dev->ep0state = DATA_STATE_RECV;
+		jz4740_ep0_out(dev, csr, 1);
+	}
+}
+
+/** Handle USB RESET interrupt
+ */
+static void jz4740_reset_irq(struct jz4740_udc *dev)
+{
+	dev->gadget.speed = (usb_readb(dev, JZ_REG_UDC_POWER) & USB_POWER_HSMODE) ?
+		USB_SPEED_HIGH : USB_SPEED_FULL;
+
+	DEBUG_SETUP("%s: address = %d, speed = %s\n", __FUNCTION__, dev->usb_address,
+		    (dev->gadget.speed == USB_SPEED_HIGH) ? "HIGH":"FULL" );
+}
+
+/*
+ *	jz4740 usb device interrupt handler.
+ */
+static irqreturn_t jz4740_udc_irq(int irq, void *_dev)
+{
+	struct jz4740_udc *dev = _dev;
+	uint8_t index;
+
+	uint32_t intr_usb = usb_readb(dev, JZ_REG_UDC_INTRUSB) & 0x7; /* mask SOF */
+	uint32_t intr_in  = usb_readw(dev, JZ_REG_UDC_INTRIN);
+	uint32_t intr_out = usb_readw(dev, JZ_REG_UDC_INTROUT);
+	uint32_t intr_dma = usb_readb(dev, JZ_REG_UDC_INTR);
+
+	if (!intr_usb && !intr_in && !intr_out && !intr_dma)
+		return IRQ_HANDLED;
+
+
+	DEBUG("intr_out=%x intr_in=%x intr_usb=%x\n",
+	      intr_out, intr_in, intr_usb);
+
+	spin_lock(&dev->lock);
+	index = usb_readb(dev, JZ_REG_UDC_INDEX);
+
+	/* Check for resume from suspend mode */
+	if ((intr_usb & USB_INTR_RESUME) &&
+	    (usb_readb(dev, JZ_REG_UDC_INTRUSBE) & USB_INTR_RESUME)) {
+		DEBUG("USB resume\n");
+		dev->driver->resume(&dev->gadget); /* We have suspend(), so we must have resume() too. */
+	}
+
+	/* Check for system interrupts */
+	if (intr_usb & USB_INTR_RESET) {
+		DEBUG("USB reset\n");
+		jz4740_reset_irq(dev);
+	}
+
+	/* Check for endpoint 0 interrupt */
+	if (intr_in & USB_INTR_EP0) {
+		DEBUG("USB_INTR_EP0 (control)\n");
+		jz4740_handle_ep0(dev, intr_in);
+	}
+
+	/* Check for Bulk-IN DMA interrupt */
+	if (intr_dma & 0x1) {
+		int ep_num;
+		struct jz4740_ep *ep;
+		ep_num = (usb_readl(dev, JZ_REG_UDC_CNTL1) >> 4) & 0xf;
+		ep = &dev->ep[ep_num + 1];
+		jz_udc_set_index(dev, ep_num);
+		usb_setb(dev, ep->csr, USB_INCSR_INPKTRDY);
+/*		jz4740_in_epn(dev, ep_num, intr_in);*/
+	}
+
+	/* Check for Bulk-OUT DMA interrupt */
+	if (intr_dma & 0x2) {
+		int ep_num;
+		ep_num = (usb_readl(dev, JZ_REG_UDC_CNTL2) >> 4) & 0xf;
+		jz4740_out_epn(dev, ep_num, intr_out);
+	}
+
+	/* Check for each configured endpoint interrupt */
+	if (intr_in & USB_INTR_INEP1) {
+		DEBUG("USB_INTR_INEP1\n");
+		jz4740_in_epn(dev, 1, intr_in);
+	}
+
+	if (intr_in & USB_INTR_INEP2) {
+		DEBUG("USB_INTR_INEP2\n");
+		jz4740_in_epn(dev, 2, intr_in);
+	}
+
+	if (intr_out & USB_INTR_OUTEP1) {
+		DEBUG("USB_INTR_OUTEP1\n");
+		jz4740_out_epn(dev, 1, intr_out);
+	}
+
+	/* Check for suspend mode */
+	if ((intr_usb & USB_INTR_SUSPEND) &&
+	    (usb_readb(dev, JZ_REG_UDC_INTRUSBE) & USB_INTR_SUSPEND)) {
+		DEBUG("USB suspend\n");
+		dev->driver->suspend(&dev->gadget);
+		/* Host unloaded from us, can do something, such as flushing
+		 the NAND block cache etc. */
+	}
+
+    jz_udc_set_index(dev, index);
+
+	spin_unlock(&dev->lock);
+
+	return IRQ_HANDLED;
+}
+
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Common functions - Added by River */
+static struct jz4740_udc udc_dev;
+
+static inline struct jz4740_udc *gadget_to_udc(struct usb_gadget *gadget)
+{
+	return container_of(gadget, struct jz4740_udc, gadget);
+}
+/* End added */
+
+static int jz4740_udc_get_frame(struct usb_gadget *_gadget)
+{
+	DEBUG("%s, %p\n", __FUNCTION__, _gadget);
+	return usb_readw(gadget_to_udc(_gadget), JZ_REG_UDC_FRAME);
+}
+
+static int jz4740_udc_wakeup(struct usb_gadget *_gadget)
+{
+	/* host may not have enabled remote wakeup */
+	/*if ((UDCCS0 & UDCCS0_DRWF) == 0)
+	   return -EHOSTUNREACH;
+	   udc_set_mask_UDCCR(UDCCR_RSM); */
+	return -ENOTSUPP;
+}
+
+static int jz4740_udc_pullup(struct usb_gadget *_gadget, int on)
+{
+	struct jz4740_udc *udc = gadget_to_udc(_gadget);
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	if (on) {
+		udc->state = UDC_STATE_ENABLE;
+		udc_enable(udc);
+	} else {
+		udc->state = UDC_STATE_DISABLE;
+		udc_disable(udc);
+	}
+
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+
+static const struct usb_gadget_ops jz4740_udc_ops = {
+	.get_frame = jz4740_udc_get_frame,
+	.wakeup = jz4740_udc_wakeup,
+	.pullup = jz4740_udc_pullup,
+	/* current versions must always be self-powered */
+};
+
+static struct usb_ep_ops jz4740_ep_ops = {
+	.enable		= jz4740_ep_enable,
+	.disable	= jz4740_ep_disable,
+
+	.alloc_request	= jz4740_alloc_request,
+	.free_request	= jz4740_free_request,
+
+	.queue		= jz4740_queue,
+	.dequeue	= jz4740_dequeue,
+
+	.set_halt	= jz4740_set_halt,
+	.fifo_status	= jz4740_fifo_status,
+	.fifo_flush	= jz4740_fifo_flush,
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+static struct jz4740_udc udc_dev = {
+	.usb_address = 0,
+	.gadget = {
+		.ops = &jz4740_udc_ops,
+		.ep0 = &udc_dev.ep[0].ep,
+		.name = "jz-udc",
+		.dev = {
+			.init_name = "gadget",
+		},
+	},
+
+	/* control endpoint */
+	.ep[0] = {
+		.ep = {
+			.name = "ep0",
+			.ops = &jz4740_ep_ops,
+			.maxpacket = EP0_MAXPACKETSIZE,
+		},
+		.dev = &udc_dev,
+
+		.bEndpointAddress = 0,
+		.bmAttributes = 0,
+
+		.type = ep_control,
+		.fifo = JZ_REG_UDC_EP_FIFO(0),
+		.csr = JZ_REG_UDC_CSR0,
+	},
+
+	/* bulk out endpoint */
+	.ep[1] = {
+		.ep = {
+			.name = "ep1out-bulk",
+			.ops = &jz4740_ep_ops,
+			.maxpacket = EPBULK_MAXPACKETSIZE,
+		},
+		.dev = &udc_dev,
+
+		.bEndpointAddress = 1,
+		.bmAttributes = USB_ENDPOINT_XFER_BULK,
+
+		.type = ep_bulk_out,
+		.fifo = JZ_REG_UDC_EP_FIFO(1),
+		.csr = JZ_REG_UDC_OUTCSR,
+	},
+
+	/* bulk in endpoint */
+	.ep[2] = {
+		.ep = {
+			.name = "ep1in-bulk",
+			.ops = &jz4740_ep_ops,
+			.maxpacket = EPBULK_MAXPACKETSIZE,
+		},
+		.dev = &udc_dev,
+
+		.bEndpointAddress = 1 | USB_DIR_IN,
+		.bmAttributes = USB_ENDPOINT_XFER_BULK,
+
+		.type = ep_bulk_in,
+		.fifo = JZ_REG_UDC_EP_FIFO(1),
+		.csr = JZ_REG_UDC_INCSR,
+	},
+
+	/* interrupt in endpoint */
+	.ep[3] = {
+		.ep = {
+			.name = "ep2in-int",
+			.ops = &jz4740_ep_ops,
+			.maxpacket = EPINTR_MAXPACKETSIZE,
+		},
+		.dev = &udc_dev,
+
+		.bEndpointAddress = 2 | USB_DIR_IN,
+		.bmAttributes = USB_ENDPOINT_XFER_INT,
+
+		.type = ep_interrupt,
+		.fifo = JZ_REG_UDC_EP_FIFO(2),
+		.csr = JZ_REG_UDC_INCSR,
+	},
+};
+
+static void gadget_release(struct device *_dev)
+{
+}
+
+
+static int __devinit jz4740_udc_probe(struct platform_device *pdev)
+{
+	struct jz4740_udc *dev = &udc_dev;
+	int ret;
+
+	spin_lock_init(&dev->lock);
+	the_controller = dev;
+
+	dev->dev = &pdev->dev;
+	dev_set_name(&dev->gadget.dev, "gadget");
+	dev->gadget.dev.parent = &pdev->dev;
+	dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
+	dev->gadget.dev.release = gadget_release;
+
+	ret = device_register(&dev->gadget.dev);
+	if (ret)
+		return ret;
+
+	dev->clk = clk_get(&pdev->dev, "udc");
+	if (IS_ERR(dev->clk)) {
+		ret = PTR_ERR(dev->clk);
+		dev_err(&pdev->dev, "Failed to get udc clock: %d\n", ret);
+		goto err_device_unregister;
+	}
+
+	platform_set_drvdata(pdev, dev);
+
+	dev->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	if (!dev->mem) {
+		ret = -ENOENT;
+		dev_err(&pdev->dev, "Failed to get mmio memory resource\n");
+		goto err_clk_put;
+	}
+
+	dev->mem = request_mem_region(dev->mem->start, resource_size(dev->mem), pdev->name);
+
+	if (!dev->mem) {
+		ret = -EBUSY;
+		dev_err(&pdev->dev, "Failed to request mmio memory region\n");
+		goto err_device_unregister;
+	}
+
+	dev->base = ioremap(dev->mem->start, resource_size(dev->mem));
+
+	if (!dev->base) {
+		ret = -EBUSY;
+		dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
+		goto err_release_mem_region;
+	}
+
+	dev->irq = platform_get_irq(pdev, 0);
+
+	ret = request_irq(dev->irq, jz4740_udc_irq, IRQF_DISABLED,
+                            pdev->name, dev);
+        if (ret) {
+                dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
+                goto err_iounmap;
+	}
+
+	udc_disable(dev);
+	udc_reinit(dev);
+
+	return 0;
+
+err_iounmap:
+	iounmap(dev->base);
+err_release_mem_region:
+	release_mem_region(dev->mem->start, resource_size(dev->mem));
+err_clk_put:
+	clk_put(dev->clk);
+err_device_unregister:
+	device_unregister(&dev->gadget.dev);
+	platform_set_drvdata(pdev, NULL);
+
+	the_controller = 0;
+
+        return ret;
+}
+
+static int __devexit jz4740_udc_remove(struct platform_device *pdev)
+{
+	struct jz4740_udc *dev = platform_get_drvdata(pdev);
+
+	if (dev->driver)
+		return -EBUSY;
+
+	udc_disable(dev);
+
+	free_irq(dev->irq, dev);
+	iounmap(dev->base);
+	release_mem_region(dev->mem->start, resource_size(dev->mem));
+	clk_put(dev->clk);
+
+	platform_set_drvdata(pdev, NULL);
+	device_unregister(&dev->gadget.dev);
+	the_controller = NULL;
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int jz4740_udc_suspend(struct device *dev)
+{
+	struct jz4740_udc *udc = dev_get_drvdata(dev);
+
+	if (udc->state == UDC_STATE_ENABLE)
+		udc_disable(udc);
+
+	return 0;
+}
+
+static int jz4740_udc_resume(struct device *dev)
+{
+	struct jz4740_udc *udc = dev_get_drvdata(dev);
+
+	if (udc->state == UDC_STATE_ENABLE)
+		udc_enable(udc);
+
+	return 0;
+}
+
+static struct dev_pm_ops jz4740_udc_pm_ops = {
+	.suspend = jz4740_udc_suspend,
+	.resume = jz4740_udc_resume,
+};
+
+#define JZ4740_UDC_PM_OPS (&jz4740_udc_pm_ops)
+
+#else
+
+#define JZ4740_UDC_PM_OPS NULL
+
+#endif
+
+static struct platform_driver udc_driver = {
+	.probe		= jz4740_udc_probe,
+	.remove		= __devexit_p(jz4740_udc_remove),
+	.driver		= {
+		.name	= "jz-udc",
+		.owner	= THIS_MODULE,
+		.pm		= JZ4740_UDC_PM_OPS,
+	},
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int __init udc_init (void)
+{
+	return platform_driver_register(&udc_driver);
+}
+module_init(udc_init);
+
+static void __exit udc_exit (void)
+{
+	platform_driver_unregister(&udc_driver);
+}
+module_exit(udc_exit);
+
+MODULE_DESCRIPTION("JZ4740 USB Device Controller");
+MODULE_AUTHOR("Wei Jianli <jlwei@ingenic.cn>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/gadget/jz4740_udc.h b/drivers/usb/gadget/jz4740_udc.h
new file mode 100644
index 0000000..7156768
--- /dev/null
+++ b/drivers/usb/gadget/jz4740_udc.h
@@ -0,0 +1,100 @@
+/*
+ * linux/drivers/usb/gadget/jz4740_udc.h
+ *
+ * Ingenic JZ4740 on-chip high speed USB device controller
+ *
+ * Copyright (C) 2006 Ingenic Semiconductor Inc.
+ * Author: <jlwei@ingenic.cn>
+ *
+ * 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.
+ */
+
+#ifndef __USB_GADGET_JZ4740_H__
+#define __USB_GADGET_JZ4740_H__
+
+/*-------------------------------------------------------------------------*/
+
+// Max packet size
+#define EP0_MAXPACKETSIZE  	64
+#define EPBULK_MAXPACKETSIZE  	512
+#define EPINTR_MAXPACKETSIZE  	64
+
+#define UDC_MAX_ENDPOINTS       4
+
+/*-------------------------------------------------------------------------*/
+
+typedef enum ep_type {
+	ep_control, ep_bulk_in, ep_bulk_out, ep_interrupt
+} ep_type_t;
+
+struct jz4740_ep {
+	struct usb_ep ep;
+	struct jz4740_udc *dev;
+
+	const struct usb_endpoint_descriptor *desc;
+	unsigned long pio_irqs;
+
+	uint8_t stopped;
+	uint8_t bEndpointAddress;
+	uint8_t bmAttributes;
+
+	ep_type_t type;
+	size_t fifo;
+	u32 csr;
+
+	uint32_t reg_addr;
+	struct list_head queue;
+};
+
+struct jz4740_request {
+	struct usb_request req;
+	struct list_head queue;
+};
+
+enum ep0state {
+	WAIT_FOR_SETUP,		/* between STATUS ack and SETUP report */
+	DATA_STATE_XMIT, 	/* data tx stage */
+	DATA_STATE_NEED_ZLP,	/* data tx zlp stage */
+	WAIT_FOR_OUT_STATUS,	/* status stages */
+	DATA_STATE_RECV,	/* data rx stage */
+};
+
+/* For function binding with UDC Disable - Added by River */
+typedef enum {
+	UDC_STATE_ENABLE = 0,
+	UDC_STATE_DISABLE,
+}udc_state_t;
+
+struct jz4740_udc {
+	struct usb_gadget gadget;
+	struct usb_gadget_driver *driver;
+	struct device *dev;
+	spinlock_t lock;
+	unsigned long lock_flags;
+
+	enum ep0state ep0state;
+	struct jz4740_ep ep[UDC_MAX_ENDPOINTS];
+
+	unsigned char usb_address;
+	
+	udc_state_t state;
+
+	struct resource *mem;
+	void __iomem *base;
+	int irq;
+	uint32_t in_mask;
+	uint32_t out_mask;
+
+	struct clk *clk;
+};
+
+extern struct jz4740_udc *the_controller;
+
+#define ep_is_in(EP) 		(((EP)->bEndpointAddress&USB_DIR_IN)==USB_DIR_IN)
+#define ep_maxpacket(EP) 	((EP)->ep.maxpacket)
+#define ep_index(EP) 		((EP)->bEndpointAddress&0xF)
+
+#endif /* __USB_GADGET_JZ4740_H__ */
-- 
1.5.6.5