USB: add atmel_usba_udc driver

This is a driver for the Atmel USBA UDC which can be found integrated
on AT32AP700x AVR32 processors. For hardware documentation, please see
the AT32AP7000 data sheet:

http://www.atmel.com/dyn/resources/prod_documents/doc32003.pdf

This is a dual speed controller (connects at high or full speed).
The driver supports up to 7 control, bulk, interrupt and isochronous
endpoints with some constraints. Bulk, interrupt and isochronous
transfers are driven by DMA.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2038 insertions, 0 deletions

diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c
new file mode 100644
index 000000000000..2bb28a583937
--- /dev/null
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -0,0 +1,2038 @@
+/*
+ * Driver for the Atmel USBA high speed USB device controller
+ *
+ * Copyright (C) 2005-2007 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/delay.h>
+
+#include <asm/gpio.h>
+#include <asm/arch/board.h>
+
+#include "atmel_usba_udc.h"
+
+
+static struct usba_udc the_udc;
+
+#ifdef CONFIG_USB_GADGET_DEBUG_FS
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+
+static int queue_dbg_open(struct inode *inode, struct file *file)
+{
+	struct usba_ep *ep = inode->i_private;
+	struct usba_request *req, *req_copy;
+	struct list_head *queue_data;
+
+	queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
+	if (!queue_data)
+		return -ENOMEM;
+	INIT_LIST_HEAD(queue_data);
+
+	spin_lock_irq(&ep->udc->lock);
+	list_for_each_entry(req, &ep->queue, queue) {
+		req_copy = kmalloc(sizeof(*req_copy), GFP_ATOMIC);
+		if (!req_copy)
+			goto fail;
+		memcpy(req_copy, req, sizeof(*req_copy));
+		list_add_tail(&req_copy->queue, queue_data);
+	}
+	spin_unlock_irq(&ep->udc->lock);
+
+	file->private_data = queue_data;
+	return 0;
+
+fail:
+	spin_unlock_irq(&ep->udc->lock);
+	list_for_each_entry_safe(req, req_copy, queue_data, queue) {
+		list_del(&req->queue);
+		kfree(req);
+	}
+	kfree(queue_data);
+	return -ENOMEM;
+}
+
+/*
+ * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
+ *
+ * b: buffer address
+ * l: buffer length
+ * I/i: interrupt/no interrupt
+ * Z/z: zero/no zero
+ * S/s: short ok/short not ok
+ * s: status
+ * n: nr_packets
+ * F/f: submitted/not submitted to FIFO
+ * D/d: using/not using DMA
+ * L/l: last transaction/not last transaction
+ */
+static ssize_t queue_dbg_read(struct file *file, char __user *buf,
+		size_t nbytes, loff_t *ppos)
+{
+	struct list_head *queue = file->private_data;
+	struct usba_request *req, *tmp_req;
+	size_t len, remaining, actual = 0;
+	char tmpbuf[38];
+
+	if (!access_ok(VERIFY_WRITE, buf, nbytes))
+		return -EFAULT;
+
+	mutex_lock(&file->f_dentry->d_inode->i_mutex);
+	list_for_each_entry_safe(req, tmp_req, queue, queue) {
+		len = snprintf(tmpbuf, sizeof(tmpbuf),
+				"%8p %08x %c%c%c %5d %c%c%c\n",
+				req->req.buf, req->req.length,
+				req->req.no_interrupt ? 'i' : 'I',
+				req->req.zero ? 'Z' : 'z',
+				req->req.short_not_ok ? 's' : 'S',
+				req->req.status,
+				req->submitted ? 'F' : 'f',
+				req->using_dma ? 'D' : 'd',
+				req->last_transaction ? 'L' : 'l');
+		len = min(len, sizeof(tmpbuf));
+		if (len > nbytes)
+			break;
+
+		list_del(&req->queue);
+		kfree(req);
+
+		remaining = __copy_to_user(buf, tmpbuf, len);
+		actual += len - remaining;
+		if (remaining)
+			break;
+
+		nbytes -= len;
+		buf += len;
+	}
+	mutex_unlock(&file->f_dentry->d_inode->i_mutex);
+
+	return actual;
+}
+
+static int queue_dbg_release(struct inode *inode, struct file *file)
+{
+	struct list_head *queue_data = file->private_data;
+	struct usba_request *req, *tmp_req;
+
+	list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
+		list_del(&req->queue);
+		kfree(req);
+	}
+	kfree(queue_data);
+	return 0;
+}
+
+static int regs_dbg_open(struct inode *inode, struct file *file)
+{
+	struct usba_udc *udc;
+	unsigned int i;
+	u32 *data;
+	int ret = -ENOMEM;
+
+	mutex_lock(&inode->i_mutex);
+	udc = inode->i_private;
+	data = kmalloc(inode->i_size, GFP_KERNEL);
+	if (!data)
+		goto out;
+
+	spin_lock_irq(&udc->lock);
+	for (i = 0; i < inode->i_size / 4; i++)
+		data[i] = __raw_readl(udc->regs + i * 4);
+	spin_unlock_irq(&udc->lock);
+
+	file->private_data = data;
+	ret = 0;
+
+out:
+	mutex_unlock(&inode->i_mutex);
+
+	return ret;
+}
+
+static ssize_t regs_dbg_read(struct file *file, char __user *buf,
+		size_t nbytes, loff_t *ppos)
+{
+	struct inode *inode = file->f_dentry->d_inode;
+	int ret;
+
+	mutex_lock(&inode->i_mutex);
+	ret = simple_read_from_buffer(buf, nbytes, ppos,
+			file->private_data,
+			file->f_dentry->d_inode->i_size);
+	mutex_unlock(&inode->i_mutex);
+
+	return ret;
+}
+
+static int regs_dbg_release(struct inode *inode, struct file *file)
+{
+	kfree(file->private_data);
+	return 0;
+}
+
+const struct file_operations queue_dbg_fops = {
+	.owner		= THIS_MODULE,
+	.open		= queue_dbg_open,
+	.llseek		= no_llseek,
+	.read		= queue_dbg_read,
+	.release	= queue_dbg_release,
+};
+
+const struct file_operations regs_dbg_fops = {
+	.owner		= THIS_MODULE,
+	.open		= regs_dbg_open,
+	.llseek		= generic_file_llseek,
+	.read		= regs_dbg_read,
+	.release	= regs_dbg_release,
+};
+
+static void usba_ep_init_debugfs(struct usba_udc *udc,
+		struct usba_ep *ep)
+{
+	struct dentry *ep_root;
+
+	ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
+	if (!ep_root)
+		goto err_root;
+	ep->debugfs_dir = ep_root;
+
+	ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
+						ep, &queue_dbg_fops);
+	if (!ep->debugfs_queue)
+		goto err_queue;
+
+	if (ep->can_dma) {
+		ep->debugfs_dma_status
+			= debugfs_create_u32("dma_status", 0400, ep_root,
+					&ep->last_dma_status);
+		if (!ep->debugfs_dma_status)
+			goto err_dma_status;
+	}
+	if (ep_is_control(ep)) {
+		ep->debugfs_state
+			= debugfs_create_u32("state", 0400, ep_root,
+					&ep->state);
+		if (!ep->debugfs_state)
+			goto err_state;
+	}
+
+	return;
+
+err_state:
+	if (ep->can_dma)
+		debugfs_remove(ep->debugfs_dma_status);
+err_dma_status:
+	debugfs_remove(ep->debugfs_queue);
+err_queue:
+	debugfs_remove(ep_root);
+err_root:
+	dev_err(&ep->udc->pdev->dev,
+		"failed to create debugfs directory for %s\n", ep->ep.name);
+}
+
+static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
+{
+	debugfs_remove(ep->debugfs_queue);
+	debugfs_remove(ep->debugfs_dma_status);
+	debugfs_remove(ep->debugfs_state);
+	debugfs_remove(ep->debugfs_dir);
+	ep->debugfs_dma_status = NULL;
+	ep->debugfs_dir = NULL;
+}
+
+static void usba_init_debugfs(struct usba_udc *udc)
+{
+	struct dentry *root, *regs;
+	struct resource *regs_resource;
+
+	root = debugfs_create_dir(udc->gadget.name, NULL);
+	if (IS_ERR(root) || !root)
+		goto err_root;
+	udc->debugfs_root = root;
+
+	regs = debugfs_create_file("regs", 0400, root, udc, &regs_dbg_fops);
+	if (!regs)
+		goto err_regs;
+
+	regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
+				CTRL_IOMEM_ID);
+	regs->d_inode->i_size = regs_resource->end - regs_resource->start + 1;
+	udc->debugfs_regs = regs;
+
+	usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
+
+	return;
+
+err_regs:
+	debugfs_remove(root);
+err_root:
+	udc->debugfs_root = NULL;
+	dev_err(&udc->pdev->dev, "debugfs is not available\n");
+}
+
+static void usba_cleanup_debugfs(struct usba_udc *udc)
+{
+	usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
+	debugfs_remove(udc->debugfs_regs);
+	debugfs_remove(udc->debugfs_root);
+	udc->debugfs_regs = NULL;
+	udc->debugfs_root = NULL;
+}
+#else
+static inline void usba_ep_init_debugfs(struct usba_udc *udc,
+					 struct usba_ep *ep)
+{
+
+}
+
+static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
+{
+
+}
+
+static inline void usba_init_debugfs(struct usba_udc *udc)
+{
+
+}
+
+static inline void usba_cleanup_debugfs(struct usba_udc *udc)
+{
+
+}
+#endif
+
+static int vbus_is_present(struct usba_udc *udc)
+{
+	if (udc->vbus_pin != -1)
+		return gpio_get_value(udc->vbus_pin);
+
+	/* No Vbus detection: Assume always present */
+	return 1;
+}
+
+static void copy_to_fifo(void __iomem *fifo, const void *buf, int len)
+{
+	unsigned long tmp;
+
+	DBG(DBG_FIFO, "copy to FIFO (len %d):\n", len);
+	for (; len > 0; len -= 4, buf += 4, fifo += 4) {
+		tmp = *(unsigned long *)buf;
+		if (len >= 4) {
+			DBG(DBG_FIFO, "  -> %08lx\n", tmp);
+			__raw_writel(tmp, fifo);
+		} else {
+			do {
+				DBG(DBG_FIFO, "  -> %02lx\n", tmp >> 24);
+				__raw_writeb(tmp >> 24, fifo);
+				fifo++;
+				tmp <<= 8;
+			} while (--len);
+			break;
+		}
+	}
+}
+
+static void copy_from_fifo(void *buf, void __iomem *fifo, int len)
+{
+	union {
+		unsigned long *w;
+		unsigned char *b;
+	} p;
+	unsigned long tmp;
+
+	DBG(DBG_FIFO, "copy from FIFO (len %d):\n", len);
+	for (p.w = buf; len > 0; len -= 4, p.w++, fifo += 4) {
+		if (len >= 4) {
+			tmp = __raw_readl(fifo);
+			*p.w = tmp;
+			DBG(DBG_FIFO, "  -> %08lx\n", tmp);
+		} else {
+			do {
+				tmp = __raw_readb(fifo);
+				*p.b = tmp;
+				DBG(DBG_FIFO, " -> %02lx\n", tmp);
+				fifo++, p.b++;
+			} while (--len);
+		}
+	}
+}
+
+static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
+{
+	unsigned int transaction_len;
+
+	transaction_len = req->req.length - req->req.actual;
+	req->last_transaction = 1;
+	if (transaction_len > ep->ep.maxpacket) {
+		transaction_len = ep->ep.maxpacket;
+		req->last_transaction = 0;
+	} else if (transaction_len == ep->ep.maxpacket && req->req.zero)
+		req->last_transaction = 0;
+
+	DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
+		ep->ep.name, req, transaction_len,
+		req->last_transaction ? ", done" : "");
+
+	copy_to_fifo(ep->fifo, req->req.buf + req->req.actual, transaction_len);
+	usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
+	req->req.actual += transaction_len;
+}
+
+static void submit_request(struct usba_ep *ep, struct usba_request *req)
+{
+	DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
+		ep->ep.name, req, req->req.length);
+
+	req->req.actual = 0;
+	req->submitted = 1;
+
+	if (req->using_dma) {
+		if (req->req.length == 0) {
+			usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
+			return;
+		}
+
+		if (req->req.zero)
+			usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
+		else
+			usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
+
+		usba_dma_writel(ep, ADDRESS, req->req.dma);
+		usba_dma_writel(ep, CONTROL, req->ctrl);
+	} else {
+		next_fifo_transaction(ep, req);
+		if (req->last_transaction) {
+			usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
+			usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
+		} else {
+			usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
+			usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
+		}
+	}
+}
+
+static void submit_next_request(struct usba_ep *ep)
+{
+	struct usba_request *req;
+
+	if (list_empty(&ep->queue)) {
+		usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
+		return;
+	}
+
+	req = list_entry(ep->queue.next, struct usba_request, queue);
+	if (!req->submitted)
+		submit_request(ep, req);
+}
+
+static void send_status(struct usba_udc *udc, struct usba_ep *ep)
+{
+	ep->state = STATUS_STAGE_IN;
+	usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
+	usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
+}
+
+static void receive_data(struct usba_ep *ep)
+{
+	struct usba_udc *udc = ep->udc;
+	struct usba_request *req;
+	unsigned long status;
+	unsigned int bytecount, nr_busy;
+	int is_complete = 0;
+
+	status = usba_ep_readl(ep, STA);
+	nr_busy = USBA_BFEXT(BUSY_BANKS, status);
+
+	DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
+
+	while (nr_busy > 0) {
+		if (list_empty(&ep->queue)) {
+			usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
+			break;
+		}
+		req = list_entry(ep->queue.next,
+				 struct usba_request, queue);
+
+		bytecount = USBA_BFEXT(BYTE_COUNT, status);
+
+		if (status & (1 << 31))
+			is_complete = 1;
+		if (req->req.actual + bytecount >= req->req.length) {
+			is_complete = 1;
+			bytecount = req->req.length - req->req.actual;
+		}
+
+		copy_from_fifo(req->req.buf + req->req.actual,
+				ep->fifo, bytecount);
+		req->req.actual += bytecount;
+
+		usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
+
+		if (is_complete) {
+			DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
+			req->req.status = 0;
+			list_del_init(&req->queue);
+			usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
+			spin_unlock(&udc->lock);
+			req->req.complete(&ep->ep, &req->req);
+			spin_lock(&udc->lock);
+		}
+
+		status = usba_ep_readl(ep, STA);
+		nr_busy = USBA_BFEXT(BUSY_BANKS, status);
+
+		if (is_complete && ep_is_control(ep)) {
+			send_status(udc, ep);
+			break;
+		}
+	}
+}
+
+static void
+request_complete(struct usba_ep *ep, struct usba_request *req, int status)
+{
+	struct usba_udc *udc = ep->udc;
+
+	WARN_ON(!list_empty(&req->queue));
+
+	if (req->req.status == -EINPROGRESS)
+		req->req.status = status;
+
+	if (req->mapped) {
+		dma_unmap_single(
+			&udc->pdev->dev, req->req.dma, req->req.length,
+			ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+		req->req.dma = DMA_ADDR_INVALID;
+		req->mapped = 0;
+	}
+
+	DBG(DBG_GADGET | DBG_REQ,
+		"%s: req %p complete: status %d, actual %u\n",
+		ep->ep.name, req, req->req.status, req->req.actual);
+
+	spin_unlock(&udc->lock);
+	req->req.complete(&ep->ep, &req->req);
+	spin_lock(&udc->lock);
+}
+
+static void
+request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
+{
+	struct usba_request *req, *tmp_req;
+
+	list_for_each_entry_safe(req, tmp_req, list, queue) {
+		list_del_init(&req->queue);
+		request_complete(ep, req, status);
+	}
+}
+
+static int
+usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
+{
+	struct usba_ep *ep = to_usba_ep(_ep);
+	struct usba_udc *udc = ep->udc;
+	unsigned long flags, ept_cfg, maxpacket;
+	unsigned int nr_trans;
+
+	DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
+
+	maxpacket = le16_to_cpu(desc->wMaxPacketSize) & 0x7ff;
+
+	if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
+			|| ep->index == 0
+			|| desc->bDescriptorType != USB_DT_ENDPOINT
+			|| maxpacket == 0
+			|| maxpacket > ep->fifo_size) {
+		DBG(DBG_ERR, "ep_enable: Invalid argument");
+		return -EINVAL;
+	}
+
+	ep->is_isoc = 0;
+	ep->is_in = 0;
+
+	if (maxpacket <= 8)
+		ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
+	else
+		/* LSB is bit 1, not 0 */
+		ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
+
+	DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
+			ep->ep.name, ept_cfg, maxpacket);
+
+	if ((desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
+		ep->is_in = 1;
+		ept_cfg |= USBA_EPT_DIR_IN;
+	}
+
+	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
+		ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		if (!ep->can_isoc) {
+			DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
+					ep->ep.name);
+			return -EINVAL;
+		}
+
+		/*
+		 * Bits 11:12 specify number of _additional_
+		 * transactions per microframe.
+		 */
+		nr_trans = ((le16_to_cpu(desc->wMaxPacketSize) >> 11) & 3) + 1;
+		if (nr_trans > 3)
+			return -EINVAL;
+
+		ep->is_isoc = 1;
+		ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
+
+		/*
+		 * Do triple-buffering on high-bandwidth iso endpoints.
+		 */
+		if (nr_trans > 1 && ep->nr_banks == 3)
+			ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
+		else
+			ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
+		ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+		ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
+		ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
+		break;
+	case USB_ENDPOINT_XFER_INT:
+		ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
+		ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
+		break;
+	}
+
+	spin_lock_irqsave(&ep->udc->lock, flags);
+
+	if (ep->desc) {
+		spin_unlock_irqrestore(&ep->udc->lock, flags);
+		DBG(DBG_ERR, "ep%d already enabled\n", ep->index);
+		return -EBUSY;
+	}
+
+	ep->desc = desc;
+	ep->ep.maxpacket = maxpacket;
+
+	usba_ep_writel(ep, CFG, ept_cfg);
+	usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
+
+	if (ep->can_dma) {
+		u32 ctrl;
+
+		usba_writel(udc, INT_ENB,
+				(usba_readl(udc, INT_ENB)
+					| USBA_BF(EPT_INT, 1 << ep->index)
+					| USBA_BF(DMA_INT, 1 << ep->index)));
+		ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
+		usba_ep_writel(ep, CTL_ENB, ctrl);
+	} else {
+		usba_writel(udc, INT_ENB,
+				(usba_readl(udc, INT_ENB)
+					| USBA_BF(EPT_INT, 1 << ep->index)));
+	}
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
+			(unsigned long)usba_ep_readl(ep, CFG));
+	DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
+			(unsigned long)usba_readl(udc, INT_ENB));
+
+	return 0;
+}
+
+static int usba_ep_disable(struct usb_ep *_ep)
+{
+	struct usba_ep *ep = to_usba_ep(_ep);
+	struct usba_udc *udc = ep->udc;
+	LIST_HEAD(req_list);
+	unsigned long flags;
+
+	DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	if (!ep->desc) {
+		spin_unlock_irqrestore(&udc->lock, flags);
+		DBG(DBG_ERR, "ep_disable: %s not enabled\n", ep->ep.name);
+		return -EINVAL;
+	}
+	ep->desc = NULL;
+
+	list_splice_init(&ep->queue, &req_list);
+	if (ep->can_dma) {
+		usba_dma_writel(ep, CONTROL, 0);
+		usba_dma_writel(ep, ADDRESS, 0);
+		usba_dma_readl(ep, STATUS);
+	}
+	usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
+	usba_writel(udc, INT_ENB,
+			usba_readl(udc, INT_ENB)
+			& ~USBA_BF(EPT_INT, 1 << ep->index));
+
+	request_complete_list(ep, &req_list, -ESHUTDOWN);
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+}
+
+static struct usb_request *
+usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
+{
+	struct usba_request *req;
+
+	DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
+
+	req = kzalloc(sizeof(*req), gfp_flags);
+	if (!req)
+		return NULL;
+
+	INIT_LIST_HEAD(&req->queue);
+	req->req.dma = DMA_ADDR_INVALID;
+
+	return &req->req;
+}
+
+static void
+usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct usba_request *req = to_usba_req(_req);
+
+	DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
+
+	kfree(req);
+}
+
+static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
+		struct usba_request *req, gfp_t gfp_flags)
+{
+	unsigned long flags;
+	int ret;
+
+	DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
+		ep->ep.name, req->req.length, req->req.dma,
+		req->req.zero ? 'Z' : 'z',
+		req->req.short_not_ok ? 'S' : 's',
+		req->req.no_interrupt ? 'I' : 'i');
+
+	if (req->req.length > 0x10000) {
+		/* Lengths from 0 to 65536 (inclusive) are supported */
+		DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
+		return -EINVAL;
+	}
+
+	req->using_dma = 1;
+
+	if (req->req.dma == DMA_ADDR_INVALID) {
+		req->req.dma = dma_map_single(
+			&udc->pdev->dev, req->req.buf, req->req.length,
+			ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+		req->mapped = 1;
+	} else {
+		dma_sync_single_for_device(
+			&udc->pdev->dev, req->req.dma, req->req.length,
+			ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+		req->mapped = 0;
+	}
+
+	req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
+			| USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
+			| USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
+
+	if (ep->is_in)
+		req->ctrl |= USBA_DMA_END_BUF_EN;
+
+	/*
+	 * Add this request to the queue and submit for DMA if
+	 * possible. Check if we're still alive first -- we may have
+	 * received a reset since last time we checked.
+	 */
+	ret = -ESHUTDOWN;
+	spin_lock_irqsave(&udc->lock, flags);
+	if (ep->desc) {
+		if (list_empty(&ep->queue))
+			submit_request(ep, req);
+
+		list_add_tail(&req->queue, &ep->queue);
+		ret = 0;
+	}
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return ret;
+}
+
+static int
+usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
+{
+	struct usba_request *req = to_usba_req(_req);
+	struct usba_ep *ep = to_usba_ep(_ep);
+	struct usba_udc *udc = ep->udc;
+	unsigned long flags;
+	int ret;
+
+	DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
+			ep->ep.name, req, _req->length);
+
+	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN || !ep->desc)
+		return -ESHUTDOWN;
+
+	req->submitted = 0;
+	req->using_dma = 0;
+	req->last_transaction = 0;
+
+	_req->status = -EINPROGRESS;
+	_req->actual = 0;
+
+	if (ep->can_dma)
+		return queue_dma(udc, ep, req, gfp_flags);
+
+	/* May have received a reset since last time we checked */
+	ret = -ESHUTDOWN;
+	spin_lock_irqsave(&udc->lock, flags);
+	if (ep->desc) {
+		list_add_tail(&req->queue, &ep->queue);
+
+		if (ep->is_in || (ep_is_control(ep)
+				&& (ep->state == DATA_STAGE_IN
+					|| ep->state == STATUS_STAGE_IN)))
+			usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
+		else
+			usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
+		ret = 0;
+	}
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return ret;
+}
+
+static void
+usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
+{
+	req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
+}
+
+static int stop_dma(struct usba_ep *ep, u32 *pstatus)
+{
+	unsigned int timeout;
+	u32 status;
+
+	/*
+	 * Stop the DMA controller. When writing both CH_EN
+	 * and LINK to 0, the other bits are not affected.
+	 */
+	usba_dma_writel(ep, CONTROL, 0);
+
+	/* Wait for the FIFO to empty */
+	for (timeout = 40; timeout; --timeout) {
+		status = usba_dma_readl(ep, STATUS);
+		if (!(status & USBA_DMA_CH_EN))
+			break;
+		udelay(1);
+	}
+
+	if (pstatus)
+		*pstatus = status;
+
+	if (timeout == 0) {
+		dev_err(&ep->udc->pdev->dev,
+			"%s: timed out waiting for DMA FIFO to empty\n",
+			ep->ep.name);
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct usba_ep *ep = to_usba_ep(_ep);
+	struct usba_udc *udc = ep->udc;
+	struct usba_request *req = to_usba_req(_req);
+	unsigned long flags;
+	u32 status;
+
+	DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
+			ep->ep.name, req);
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	if (req->using_dma) {
+		/*
+		 * If this request is currently being transferred,
+		 * stop the DMA controller and reset the FIFO.
+		 */
+		if (ep->queue.next == &req->queue) {
+			status = usba_dma_readl(ep, STATUS);
+			if (status & USBA_DMA_CH_EN)
+				stop_dma(ep, &status);
+
+#ifdef CONFIG_USB_GADGET_DEBUG_FS
+			ep->last_dma_status = status;
+#endif
+
+			usba_writel(udc, EPT_RST, 1 << ep->index);
+
+			usba_update_req(ep, req, status);
+		}
+	}
+
+	/*
+	 * Errors should stop the queue from advancing until the
+	 * completion function returns.
+	 */
+	list_del_init(&req->queue);
+
+	request_complete(ep, req, -ECONNRESET);
+
+	/* Process the next request if any */
+	submit_next_request(ep);
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+}
+
+static int usba_ep_set_halt(struct usb_ep *_ep, int value)
+{
+	struct usba_ep *ep = to_usba_ep(_ep);
+	struct usba_udc *udc = ep->udc;
+	unsigned long flags;
+	int ret = 0;
+
+	DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
+			value ? "set" : "clear");
+
+	if (!ep->desc) {
+		DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
+				ep->ep.name);
+		return -ENODEV;
+	}
+	if (ep->is_isoc) {
+		DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
+				ep->ep.name);
+		return -ENOTTY;
+	}
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	/*
+	 * We can't halt IN endpoints while there are still data to be
+	 * transferred
+	 */
+	if (!list_empty(&ep->queue)
+			|| ((value && ep->is_in && (usba_ep_readl(ep, STA)
+					& USBA_BF(BUSY_BANKS, -1L))))) {
+		ret = -EAGAIN;
+	} else {
+		if (value)
+			usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
+		else
+			usba_ep_writel(ep, CLR_STA,
+					USBA_FORCE_STALL | USBA_TOGGLE_CLR);
+		usba_ep_readl(ep, STA);
+	}
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return ret;
+}
+
+static int usba_ep_fifo_status(struct usb_ep *_ep)
+{
+	struct usba_ep *ep = to_usba_ep(_ep);
+
+	return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
+}
+
+static void usba_ep_fifo_flush(struct usb_ep *_ep)
+{
+	struct usba_ep *ep = to_usba_ep(_ep);
+	struct usba_udc *udc = ep->udc;
+
+	usba_writel(udc, EPT_RST, 1 << ep->index);
+}
+
+static const struct usb_ep_ops usba_ep_ops = {
+	.enable		= usba_ep_enable,
+	.disable	= usba_ep_disable,
+	.alloc_request	= usba_ep_alloc_request,
+	.free_request	= usba_ep_free_request,
+	.queue		= usba_ep_queue,
+	.dequeue	= usba_ep_dequeue,
+	.set_halt	= usba_ep_set_halt,
+	.fifo_status	= usba_ep_fifo_status,
+	.fifo_flush	= usba_ep_fifo_flush,
+};
+
+static int usba_udc_get_frame(struct usb_gadget *gadget)
+{
+	struct usba_udc *udc = to_usba_udc(gadget);
+
+	return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
+}
+
+static const struct usb_gadget_ops usba_udc_ops = {
+	.get_frame	= usba_udc_get_frame,
+};
+
+#define EP(nam, idx, maxpkt, maxbk, dma, isoc)			\
+{								\
+	.ep	= {						\
+		.ops		= &usba_ep_ops,			\
+		.name		= nam,				\
+		.maxpacket	= maxpkt,			\
+	},							\
+	.udc		= &the_udc,				\
+	.queue		= LIST_HEAD_INIT(usba_ep[idx].queue),	\
+	.fifo_size	= maxpkt,				\
+	.nr_banks	= maxbk,				\
+	.index		= idx,					\
+	.can_dma	= dma,					\
+	.can_isoc	= isoc,					\
+}
+
+static struct usba_ep usba_ep[] = {
+	EP("ep0", 0, 64, 1, 0, 0),
+	EP("ep1in-bulk", 1, 512, 2, 1, 1),
+	EP("ep2out-bulk", 2, 512, 2, 1, 1),
+	EP("ep3in-int", 3, 64, 3, 1, 0),
+	EP("ep4out-int", 4, 64, 3, 1, 0),
+	EP("ep5in-iso", 5, 1024, 3, 1, 1),
+	EP("ep6out-iso", 6, 1024, 3, 1, 1),
+};
+#undef EP
+
+static struct usb_endpoint_descriptor usba_ep0_desc = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 0,
+	.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+	.wMaxPacketSize = __constant_cpu_to_le16(64),
+	/* FIXME: I have no idea what to put here */
+	.bInterval = 1,
+};
+
+static void nop_release(struct device *dev)
+{
+
+}
+
+static struct usba_udc the_udc = {
+	.gadget	= {
+		.ops		= &usba_udc_ops,
+		.ep0		= &usba_ep[0].ep,
+		.ep_list	= LIST_HEAD_INIT(the_udc.gadget.ep_list),
+		.is_dualspeed	= 1,
+		.name		= "atmel_usba_udc",
+		.dev	= {
+			.bus_id		= "gadget",
+			.release	= nop_release,
+		},
+	},
+
+	.lock	= SPIN_LOCK_UNLOCKED,
+};
+
+/*
+ * Called with interrupts disabled and udc->lock held.
+ */
+static void reset_all_endpoints(struct usba_udc *udc)
+{
+	struct usba_ep *ep;
+	struct usba_request *req, *tmp_req;
+
+	usba_writel(udc, EPT_RST, ~0UL);
+
+	ep = to_usba_ep(udc->gadget.ep0);
+	list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
+		list_del_init(&req->queue);
+		request_complete(ep, req, -ECONNRESET);
+	}
+
+	list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
+		if (ep->desc)
+			usba_ep_disable(&ep->ep);
+	}
+}
+
+static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
+{
+	struct usba_ep *ep;
+
+	if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
+		return to_usba_ep(udc->gadget.ep0);
+
+	list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
+		u8 bEndpointAddress;
+
+		if (!ep->desc)
+			continue;
+		bEndpointAddress = ep->desc->bEndpointAddress;
+		if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
+			continue;
+		if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
+				== (wIndex & USB_ENDPOINT_NUMBER_MASK))
+			return ep;
+	}
+
+	return NULL;
+}
+
+/* Called with interrupts disabled and udc->lock held */
+static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
+{
+	usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
+	ep->state = WAIT_FOR_SETUP;
+}
+
+static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
+{
+	if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
+		return 1;
+	return 0;
+}
+
+static inline void set_address(struct usba_udc *udc, unsigned int addr)
+{
+	u32 regval;
+
+	DBG(DBG_BUS, "setting address %u...\n", addr);
+	regval = usba_readl(udc, CTRL);
+	regval = USBA_BFINS(DEV_ADDR, addr, regval);
+	usba_writel(udc, CTRL, regval);
+}
+
+static int do_test_mode(struct usba_udc *udc)
+{
+	static const char test_packet_buffer[] = {
+		/* JKJKJKJK * 9 */
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		/* JJKKJJKK * 8 */
+		0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+		/* JJKKJJKK * 8 */
+		0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
+		/* JJJJJJJKKKKKKK * 8 */
+		0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+		0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+		/* JJJJJJJK * 8 */
+		0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
+		/* {JKKKKKKK * 10}, JK */
+		0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
+	};
+	struct usba_ep *ep;
+	struct device *dev = &udc->pdev->dev;
+	int test_mode;
+
+	test_mode = udc->test_mode;
+
+	/* Start from a clean slate */
+	reset_all_endpoints(udc);
+
+	switch (test_mode) {
+	case 0x0100:
+		/* Test_J */
+		usba_writel(udc, TST, USBA_TST_J_MODE);
+		dev_info(dev, "Entering Test_J mode...\n");
+		break;
+	case 0x0200:
+		/* Test_K */
+		usba_writel(udc, TST, USBA_TST_K_MODE);
+		dev_info(dev, "Entering Test_K mode...\n");
+		break;
+	case 0x0300:
+		/*
+		 * Test_SE0_NAK: Force high-speed mode and set up ep0
+		 * for Bulk IN transfers
+		 */
+		ep = &usba_ep[0];
+		usba_writel(udc, TST,
+				USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
+		usba_ep_writel(ep, CFG,
+				USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
+				| USBA_EPT_DIR_IN
+				| USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
+				| USBA_BF(BK_NUMBER, 1));
+		if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
+			set_protocol_stall(udc, ep);
+			dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
+		} else {
+			usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
+			dev_info(dev, "Entering Test_SE0_NAK mode...\n");
+		}
+		break;
+	case 0x0400:
+		/* Test_Packet */
+		ep = &usba_ep[0];
+		usba_ep_writel(ep, CFG,
+				USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
+				| USBA_EPT_DIR_IN
+				| USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
+				| USBA_BF(BK_NUMBER, 1));
+		if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
+			set_protocol_stall(udc, ep);
+			dev_err(dev, "Test_Packet: ep0 not mapped\n");
+		} else {
+			usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
+			usba_writel(udc, TST, USBA_TST_PKT_MODE);
+			copy_to_fifo(ep->fifo, test_packet_buffer,
+					sizeof(test_packet_buffer));
+			usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
+			dev_info(dev, "Entering Test_Packet mode...\n");
+		}
+		break;
+	default:
+		dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* Avoid overly long expressions */
+static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
+{
+	if (crq->wValue == __constant_cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
+		return true;
+	return false;
+}
+
+static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
+{
+	if (crq->wValue == __constant_cpu_to_le16(USB_DEVICE_TEST_MODE))
+		return true;
+	return false;
+}
+
+static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
+{
+	if (crq->wValue == __constant_cpu_to_le16(USB_ENDPOINT_HALT))
+		return true;
+	return false;
+}
+
+static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
+		struct usb_ctrlrequest *crq)
+{
+	int retval = 0;;
+
+	switch (crq->bRequest) {
+	case USB_REQ_GET_STATUS: {
+		u16 status;
+
+		if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
+			/* Self-powered, no remote wakeup */
+			status = __constant_cpu_to_le16(1 << 0);
+		} else if (crq->bRequestType
+				== (USB_DIR_IN | USB_RECIP_INTERFACE)) {
+			status = __constant_cpu_to_le16(0);
+		} else if (crq->bRequestType
+				== (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
+			struct usba_ep *target;
+
+			target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
+			if (!target)
+				goto stall;
+
+			status = 0;
+			if (is_stalled(udc, target))
+				status |= __constant_cpu_to_le16(1);
+		} else
+			goto delegate;
+
+		/* Write directly to the FIFO. No queueing is done. */
+		if (crq->wLength != __constant_cpu_to_le16(sizeof(status)))
+			goto stall;
+		ep->state = DATA_STAGE_IN;
+		__raw_writew(status, ep->fifo);
+		usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
+		break;
+	}
+
+	case USB_REQ_CLEAR_FEATURE: {
+		if (crq->bRequestType == USB_RECIP_DEVICE) {
+			if (feature_is_dev_remote_wakeup(crq)) {
+				/* TODO: Handle REMOTE_WAKEUP */
+			} else {
+				/* Can't CLEAR_FEATURE TEST_MODE */
+				goto stall;
+			}
+		} else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
+			struct usba_ep *target;
+
+			if (crq->wLength != __constant_cpu_to_le16(0)
+					|| !feature_is_ep_halt(crq))
+				goto stall;
+			target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
+			if (!target)
+				goto stall;
+
+			usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
+			if (target->index != 0)
+				usba_ep_writel(target, CLR_STA,
+						USBA_TOGGLE_CLR);
+		} else {
+			goto delegate;
+		}
+
+		send_status(udc, ep);
+		break;
+	}
+
+	case USB_REQ_SET_FEATURE: {
+		if (crq->bRequestType == USB_RECIP_DEVICE) {
+			if (feature_is_dev_test_mode(crq)) {
+				send_status(udc, ep);
+				ep->state = STATUS_STAGE_TEST;
+				udc->test_mode = le16_to_cpu(crq->wIndex);
+				return 0;
+			} else if (feature_is_dev_remote_wakeup(crq)) {
+				/* TODO: Handle REMOTE_WAKEUP */
+			} else {
+				goto stall;
+			}
+		} else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
+			struct usba_ep *target;
+
+			if (crq->wLength != __constant_cpu_to_le16(0)
+					|| !feature_is_ep_halt(crq))
+				goto stall;
+
+			target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
+			if (!target)
+				goto stall;
+
+			usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
+		} else
+			goto delegate;
+
+		send_status(udc, ep);
+		break;
+	}
+
+	case USB_REQ_SET_ADDRESS:
+		if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
+			goto delegate;
+
+		set_address(udc, le16_to_cpu(crq->wValue));
+		send_status(udc, ep);
+		ep->state = STATUS_STAGE_ADDR;
+		break;
+
+	default:
+delegate:
+		spin_unlock(&udc->lock);
+		retval = udc->driver->setup(&udc->gadget, crq);
+		spin_lock(&udc->lock);
+	}
+
+	return retval;
+
+stall:
+	printk(KERN_ERR
+		"udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
+		"halting endpoint...\n",
+		ep->ep.name, crq->bRequestType, crq->bRequest,
+		le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
+		le16_to_cpu(crq->wLength));
+	set_protocol_stall(udc, ep);
+	return -1;
+}
+
+static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
+{
+	struct usba_request *req;
+	u32 epstatus;
+	u32 epctrl;
+
+restart:
+	epstatus = usba_ep_readl(ep, STA);
+	epctrl = usba_ep_readl(ep, CTL);
+
+	DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
+			ep->ep.name, ep->state, epstatus, epctrl);
+
+	req = NULL;
+	if (!list_empty(&ep->queue))
+		req = list_entry(ep->queue.next,
+				 struct usba_request, queue);
+
+	if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
+		if (req->submitted)
+			next_fifo_transaction(ep, req);
+		else
+			submit_request(ep, req);
+
+		if (req->last_transaction) {
+			usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
+			usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
+		}
+		goto restart;
+	}
+	if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
+		usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
+
+		switch (ep->state) {
+		case DATA_STAGE_IN:
+			usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
+			usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
+			ep->state = STATUS_STAGE_OUT;
+			break;
+		case STATUS_STAGE_ADDR:
+			/* Activate our new address */
+			usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
+						| USBA_FADDR_EN));
+			usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
+			ep->state = WAIT_FOR_SETUP;
+			break;
+		case STATUS_STAGE_IN:
+			if (req) {
+				list_del_init(&req->queue);
+				request_complete(ep, req, 0);
+				submit_next_request(ep);
+			}
+			usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
+			ep->state = WAIT_FOR_SETUP;
+			break;
+		case STATUS_STAGE_TEST:
+			usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
+			ep->state = WAIT_FOR_SETUP;
+			if (do_test_mode(udc))
+				set_protocol_stall(udc, ep);
+			break;
+		default:
+			printk(KERN_ERR
+				"udc: %s: TXCOMP: Invalid endpoint state %d, "
+				"halting endpoint...\n",
+				ep->ep.name, ep->state);
+			set_protocol_stall(udc, ep);
+			break;
+		}
+
+		goto restart;
+	}
+	if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
+		switch (ep->state) {
+		case STATUS_STAGE_OUT:
+			usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
+			usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
+
+			if (req) {
+				list_del_init(&req->queue);
+				request_complete(ep, req, 0);
+			}
+			ep->state = WAIT_FOR_SETUP;
+			break;
+
+		case DATA_STAGE_OUT:
+			receive_data(ep);
+			break;
+
+		default:
+			usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
+			usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
+			printk(KERN_ERR
+				"udc: %s: RXRDY: Invalid endpoint state %d, "
+				"halting endpoint...\n",
+				ep->ep.name, ep->state);
+			set_protocol_stall(udc, ep);
+			break;
+		}
+
+		goto restart;
+	}
+	if (epstatus & USBA_RX_SETUP) {
+		union {
+			struct usb_ctrlrequest crq;
+			unsigned long data[2];
+		} crq;
+		unsigned int pkt_len;
+		int ret;
+
+		if (ep->state != WAIT_FOR_SETUP) {
+			/*
+			 * Didn't expect a SETUP packet at this
+			 * point. Clean up any pending requests (which
+			 * may be successful).
+			 */
+			int status = -EPROTO;
+
+			/*
+			 * RXRDY and TXCOMP are dropped when SETUP
+			 * packets arrive.  Just pretend we received
+			 * the status packet.
+			 */
+			if (ep->state == STATUS_STAGE_OUT
+					|| ep->state == STATUS_STAGE_IN) {
+				usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
+				status = 0;
+			}
+
+			if (req) {
+				list_del_init(&req->queue);
+				request_complete(ep, req, status);
+			}
+		}
+
+		pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
+		DBG(DBG_HW, "Packet length: %u\n", pkt_len);
+		if (pkt_len != sizeof(crq)) {
+			printk(KERN_WARNING "udc: Invalid packet length %u "
+				"(expected %lu)\n", pkt_len, sizeof(crq));
+			set_protocol_stall(udc, ep);
+			return;
+		}
+
+		DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
+		copy_from_fifo(crq.data, ep->fifo, sizeof(crq));
+
+		/* Free up one bank in the FIFO so that we can
+		 * generate or receive a reply right away. */
+		usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
+
+		/* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
+			ep->state, crq.crq.bRequestType,
+			crq.crq.bRequest); */
+
+		if (crq.crq.bRequestType & USB_DIR_IN) {
+			/*
+			 * The USB 2.0 spec states that "if wLength is
+			 * zero, there is no data transfer phase."
+			 * However, testusb #14 seems to actually
+			 * expect a data phase even if wLength = 0...
+			 */
+			ep->state = DATA_STAGE_IN;
+		} else {
+			if (crq.crq.wLength != __constant_cpu_to_le16(0))
+				ep->state = DATA_STAGE_OUT;
+			else
+				ep->state = STATUS_STAGE_IN;
+		}
+
+		ret = -1;
+		if (ep->index == 0)
+			ret = handle_ep0_setup(udc, ep, &crq.crq);
+		else {
+			spin_unlock(&udc->lock);
+			ret = udc->driver->setup(&udc->gadget, &crq.crq);
+			spin_lock(&udc->lock);
+		}
+
+		DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
+			crq.crq.bRequestType, crq.crq.bRequest,
+			le16_to_cpu(crq.crq.wLength), ep->state, ret);
+
+		if (ret < 0) {
+			/* Let the host know that we failed */
+			set_protocol_stall(udc, ep);
+		}
+	}
+}
+
+static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
+{
+	struct usba_request *req;
+	u32 epstatus;
+	u32 epctrl;
+
+	epstatus = usba_ep_readl(ep, STA);
+	epctrl = usba_ep_readl(ep, CTL);
+
+	DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
+
+	while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
+		DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
+
+		if (list_empty(&ep->queue)) {
+			dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
+			usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
+			return;
+		}
+
+		req = list_entry(ep->queue.next, struct usba_request, queue);
+
+		if (req->using_dma) {
+			/* Send a zero-length packet */
+			usba_ep_writel(ep, SET_STA,
+					USBA_TX_PK_RDY);
+			usba_ep_writel(ep, CTL_DIS,
+					USBA_TX_PK_RDY);
+			list_del_init(&req->queue);
+			submit_next_request(ep);
+			request_complete(ep, req, 0);
+		} else {
+			if (req->submitted)
+				next_fifo_transaction(ep, req);
+			else
+				submit_request(ep, req);
+
+			if (req->last_transaction) {
+				list_del_init(&req->queue);
+				submit_next_request(ep);
+				request_complete(ep, req, 0);
+			}
+		}
+
+		epstatus = usba_ep_readl(ep, STA);
+		epctrl = usba_ep_readl(ep, CTL);
+	}
+	if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
+		DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
+		receive_data(ep);
+		usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
+	}
+}
+
+static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
+{
+	struct usba_request *req;
+	u32 status, control, pending;
+
+	status = usba_dma_readl(ep, STATUS);
+	control = usba_dma_readl(ep, CONTROL);
+#ifdef CONFIG_USB_GADGET_DEBUG_FS
+	ep->last_dma_status = status;
+#endif
+	pending = status & control;
+	DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
+
+	if (status & USBA_DMA_CH_EN) {
+		dev_err(&udc->pdev->dev,
+			"DMA_CH_EN is set after transfer is finished!\n");
+		dev_err(&udc->pdev->dev,
+			"status=%#08x, pending=%#08x, control=%#08x\n",
+			status, pending, control);
+
+		/*
+		 * try to pretend nothing happened. We might have to
+		 * do something here...
+		 */
+	}
+
+	if (list_empty(&ep->queue))
+		/* Might happen if a reset comes along at the right moment */
+		return;
+
+	if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
+		req = list_entry(ep->queue.next, struct usba_request, queue);
+		usba_update_req(ep, req, status);
+
+		list_del_init(&req->queue);
+		submit_next_request(ep);
+		request_complete(ep, req, 0);
+	}
+}
+
+static irqreturn_t usba_udc_irq(int irq, void *devid)
+{
+	struct usba_udc *udc = devid;
+	u32 status;
+	u32 dma_status;
+	u32 ep_status;
+
+	spin_lock(&udc->lock);
+
+	status = usba_readl(udc, INT_STA);
+	DBG(DBG_INT, "irq, status=%#08x\n", status);
+
+	if (status & USBA_DET_SUSPEND) {
+		usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
+		DBG(DBG_BUS, "Suspend detected\n");
+		if (udc->gadget.speed != USB_SPEED_UNKNOWN
+				&& udc->driver && udc->driver->suspend) {
+			spin_unlock(&udc->lock);
+			udc->driver->suspend(&udc->gadget);
+			spin_lock(&udc->lock);
+		}
+	}
+
+	if (status & USBA_WAKE_UP) {
+		usba_writel(udc, INT_CLR, USBA_WAKE_UP);
+		DBG(DBG_BUS, "Wake Up CPU detected\n");
+	}
+
+	if (status & USBA_END_OF_RESUME) {
+		usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
+		DBG(DBG_BUS, "Resume detected\n");
+		if (udc->gadget.speed != USB_SPEED_UNKNOWN
+				&& udc->driver && udc->driver->resume) {
+			spin_unlock(&udc->lock);
+			udc->driver->resume(&udc->gadget);
+			spin_lock(&udc->lock);
+		}
+	}
+
+	dma_status = USBA_BFEXT(DMA_INT, status);
+	if (dma_status) {
+		int i;
+
+		for (i = 1; i < USBA_NR_ENDPOINTS; i++)
+			if (dma_status & (1 << i))
+				usba_dma_irq(udc, &usba_ep[i]);
+	}
+
+	ep_status = USBA_BFEXT(EPT_INT, status);
+	if (ep_status) {
+		int i;
+
+		for (i = 0; i < USBA_NR_ENDPOINTS; i++)
+			if (ep_status & (1 << i)) {
+				if (ep_is_control(&usba_ep[i]))
+					usba_control_irq(udc, &usba_ep[i]);
+				else
+					usba_ep_irq(udc, &usba_ep[i]);
+			}
+	}
+
+	if (status & USBA_END_OF_RESET) {
+		struct usba_ep *ep0;
+
+		usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
+		reset_all_endpoints(udc);
+
+		if (status & USBA_HIGH_SPEED) {
+			DBG(DBG_BUS, "High-speed bus reset detected\n");
+			udc->gadget.speed = USB_SPEED_HIGH;
+		} else {
+			DBG(DBG_BUS, "Full-speed bus reset detected\n");
+			udc->gadget.speed = USB_SPEED_FULL;
+		}
+
+		ep0 = &usba_ep[0];
+		ep0->desc = &usba_ep0_desc;
+		ep0->state = WAIT_FOR_SETUP;
+		usba_ep_writel(ep0, CFG,
+				(USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
+				| USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
+				| USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
+		usba_ep_writel(ep0, CTL_ENB,
+				USBA_EPT_ENABLE | USBA_RX_SETUP);
+		usba_writel(udc, INT_ENB,
+				(usba_readl(udc, INT_ENB)
+				| USBA_BF(EPT_INT, 1)
+				| USBA_DET_SUSPEND
+				| USBA_END_OF_RESUME));
+
+		if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
+			dev_warn(&udc->pdev->dev,
+				 "WARNING: EP0 configuration is invalid!\n");
+	}
+
+	spin_unlock(&udc->lock);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t usba_vbus_irq(int irq, void *devid)
+{
+	struct usba_udc *udc = devid;
+	int vbus;
+
+	/* debounce */
+	udelay(10);
+
+	spin_lock(&udc->lock);
+
+	/* May happen if Vbus pin toggles during probe() */
+	if (!udc->driver)
+		goto out;
+
+	vbus = gpio_get_value(udc->vbus_pin);
+	if (vbus != udc->vbus_prev) {
+		if (vbus) {
+			usba_writel(udc, CTRL, USBA_EN_USBA);
+			usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
+		} else {
+			udc->gadget.speed = USB_SPEED_UNKNOWN;
+			reset_all_endpoints(udc);
+			usba_writel(udc, CTRL, 0);
+			spin_unlock(&udc->lock);
+			udc->driver->disconnect(&udc->gadget);
+			spin_lock(&udc->lock);
+		}
+		udc->vbus_prev = vbus;
+	}
+
+out:
+	spin_unlock(&udc->lock);
+
+	return IRQ_HANDLED;
+}
+
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+	struct usba_udc *udc = &the_udc;
+	unsigned long flags;
+	int ret;
+
+	if (!udc->pdev)
+		return -ENODEV;
+
+	spin_lock_irqsave(&udc->lock, flags);
+	if (udc->driver) {
+		spin_unlock_irqrestore(&udc->lock, flags);
+		return -EBUSY;
+	}
+
+	udc->driver = driver;
+	udc->gadget.dev.driver = &driver->driver;
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	clk_enable(udc->pclk);
+	clk_enable(udc->hclk);
+
+	ret = driver->bind(&udc->gadget);
+	if (ret) {
+		DBG(DBG_ERR, "Could not bind to driver %s: error %d\n",
+			driver->driver.name, ret);
+		goto err_driver_bind;
+	}
+
+	DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
+
+	udc->vbus_prev = 0;
+	if (udc->vbus_pin != -1)
+		enable_irq(gpio_to_irq(udc->vbus_pin));
+
+	/* If Vbus is present, enable the controller and wait for reset */
+	spin_lock_irqsave(&udc->lock, flags);
+	if (vbus_is_present(udc) && udc->vbus_prev == 0) {
+		usba_writel(udc, CTRL, USBA_EN_USBA);
+		usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
+	}
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+
+err_driver_bind:
+	udc->driver = NULL;
+	udc->gadget.dev.driver = NULL;
+	return ret;
+}
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+	struct usba_udc *udc = &the_udc;
+	unsigned long flags;
+
+	if (!udc->pdev)
+		return -ENODEV;
+	if (driver != udc->driver)
+		return -EINVAL;
+
+	if (udc->vbus_pin != -1)
+		disable_irq(gpio_to_irq(udc->vbus_pin));
+
+	spin_lock_irqsave(&udc->lock, flags);
+	udc->gadget.speed = USB_SPEED_UNKNOWN;
+	reset_all_endpoints(udc);
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	/* This will also disable the DP pullup */
+	usba_writel(udc, CTRL, 0);
+
+	driver->unbind(&udc->gadget);
+	udc->gadget.dev.driver = NULL;
+	udc->driver = NULL;
+
+	clk_disable(udc->hclk);
+	clk_disable(udc->pclk);
+
+	DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
+
+	return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+static int __init usba_udc_probe(struct platform_device *pdev)
+{
+	struct usba_platform_data *pdata = pdev->dev.platform_data;
+	struct resource *regs, *fifo;
+	struct clk *pclk, *hclk;
+	struct usba_udc *udc = &the_udc;
+	int irq, ret, i;
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
+	fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
+	if (!regs || !fifo)
+		return -ENXIO;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	pclk = clk_get(&pdev->dev, "pclk");
+	if (IS_ERR(pclk))
+		return PTR_ERR(pclk);
+	hclk = clk_get(&pdev->dev, "hclk");
+	if (IS_ERR(hclk)) {
+		ret = PTR_ERR(hclk);
+		goto err_get_hclk;
+	}
+
+	udc->pdev = pdev;
+	udc->pclk = pclk;
+	udc->hclk = hclk;
+	udc->vbus_pin = -1;
+
+	ret = -ENOMEM;
+	udc->regs = ioremap(regs->start, regs->end - regs->start + 1);
+	if (!udc->regs) {
+		dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
+		goto err_map_regs;
+	}
+	dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
+		 (unsigned long)regs->start, udc->regs);
+	udc->fifo = ioremap(fifo->start, fifo->end - fifo->start + 1);
+	if (!udc->fifo) {
+		dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
+		goto err_map_fifo;
+	}
+	dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
+		 (unsigned long)fifo->start, udc->fifo);
+
+	device_initialize(&udc->gadget.dev);
+	udc->gadget.dev.parent = &pdev->dev;
+	udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
+
+	platform_set_drvdata(pdev, udc);
+
+	/* Make sure we start from a clean slate */
+	clk_enable(pclk);
+	usba_writel(udc, CTRL, 0);
+	clk_disable(pclk);
+
+	INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
+	usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
+	usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
+	usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
+	for (i = 1; i < ARRAY_SIZE(usba_ep); i++) {
+		struct usba_ep *ep = &usba_ep[i];
+
+		ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
+		ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
+		ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
+
+		list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
+	}
+
+	ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
+	if (ret) {
+		dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
+			irq, ret);
+		goto err_request_irq;
+	}
+	udc->irq = irq;
+
+	ret = device_add(&udc->gadget.dev);
+	if (ret) {
+		dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
+		goto err_device_add;
+	}
+
+	if (pdata && pdata->vbus_pin != GPIO_PIN_NONE) {
+		if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
+			udc->vbus_pin = pdata->vbus_pin;
+
+			ret = request_irq(gpio_to_irq(udc->vbus_pin),
+					usba_vbus_irq, 0,
+					"atmel_usba_udc", udc);
+			if (ret) {
+				gpio_free(udc->vbus_pin);
+				udc->vbus_pin = -1;
+				dev_warn(&udc->pdev->dev,
+					 "failed to request vbus irq; "
+					 "assuming always on\n");
+			} else {
+				disable_irq(gpio_to_irq(udc->vbus_pin));
+			}
+		}
+	}
+
+	usba_init_debugfs(udc);
+	for (i = 1; i < ARRAY_SIZE(usba_ep); i++)
+		usba_ep_init_debugfs(udc, &usba_ep[i]);
+
+	return 0;
+
+err_device_add:
+	free_irq(irq, udc);
+err_request_irq:
+	iounmap(udc->fifo);
+err_map_fifo:
+	iounmap(udc->regs);
+err_map_regs:
+	clk_put(hclk);
+err_get_hclk:
+	clk_put(pclk);
+
+	platform_set_drvdata(pdev, NULL);
+
+	return ret;
+}
+
+static int __exit usba_udc_remove(struct platform_device *pdev)
+{
+	struct usba_udc *udc;
+	int i;
+
+	udc = platform_get_drvdata(pdev);
+
+	for (i = 1; i < ARRAY_SIZE(usba_ep); i++)
+		usba_ep_cleanup_debugfs(&usba_ep[i]);
+	usba_cleanup_debugfs(udc);
+
+	if (udc->vbus_pin != -1)
+		gpio_free(udc->vbus_pin);
+
+	free_irq(udc->irq, udc);
+	iounmap(udc->fifo);
+	iounmap(udc->regs);
+	clk_put(udc->hclk);
+	clk_put(udc->pclk);
+
+	device_unregister(&udc->gadget.dev);
+
+	return 0;
+}
+
+static struct platform_driver udc_driver = {
+	.remove		= __exit_p(usba_udc_remove),
+	.driver		= {
+		.name		= "atmel_usba_udc",
+	},
+};
+
+static int __init udc_init(void)
+{
+	return platform_driver_probe(&udc_driver, usba_udc_probe);
+}
+module_init(udc_init);
+
+static void __exit udc_exit(void)
+{
+	platform_driver_unregister(&udc_driver);
+}
+module_exit(udc_exit);
+
+MODULE_DESCRIPTION("Atmel USBA UDC driver");
+MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
+MODULE_LICENSE("GPL");