atmel_usba_udc.c 49.3 KB
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/*
 * 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>
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#include <linux/slab.h>
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#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>
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#include <linux/usb/atmel_usba_udc.h>
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#include <linux/delay.h>
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#include <linux/platform_data/atmel.h>
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#include <asm/gpio.h>

#include "atmel_usba_udc.h"


static struct usba_udc the_udc;
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static struct usba_ep *usba_ep;
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#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) {
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		req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
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		if (!req_copy)
			goto fail;
		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;

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	mutex_lock(&file_inode(file)->i_mutex);
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	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;
	}
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	mutex_unlock(&file_inode(file)->i_mutex);
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	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)
{
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	struct inode *inode = file_inode(file);
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	int ret;

	mutex_lock(&inode->i_mutex);
	ret = simple_read_from_buffer(buf, nbytes, ppos,
			file->private_data,
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			file_inode(file)->i_size);
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	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);
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	regs->d_inode->i_size = resource_size(regs_resource);
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	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)
{
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	if (gpio_is_valid(udc->vbus_pin))
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		return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
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	/* No Vbus detection: Assume always present */
	return 1;
}

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#if defined(CONFIG_ARCH_AT91SAM9RL)
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#include <mach/at91_pmc.h>
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static void toggle_bias(int is_on)
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{
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	unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
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	if (is_on)
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		at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
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	else
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		at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
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}

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#else

static void toggle_bias(int is_on)
{
}

#endif /* CONFIG_ARCH_AT91SAM9RL */
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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" : "");

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	memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
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	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;
		}

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		memcpy_fromio(req->req.buf + req->req.actual,
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				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);

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	maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
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	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);

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	if (usb_endpoint_dir_in(desc)) {
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		ep->is_in = 1;
		ept_cfg |= USBA_EPT_DIR_IN;
	}

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	switch (usb_endpoint_type(desc)) {
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	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.
		 */
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		nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
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		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);

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	ep->ep.desc = desc;
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	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);

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	if (!ep->ep.desc) {
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		spin_unlock_irqrestore(&udc->lock, flags);
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		/* REVISIT because this driver disables endpoints in
		 * reset_all_endpoints() before calling disconnect(),
		 * most gadget drivers would trigger this non-error ...
		 */
		if (udc->gadget.speed != USB_SPEED_UNKNOWN)
			DBG(DBG_ERR, "ep_disable: %s not enabled\n",
					ep->ep.name);
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		return -EINVAL;
	}
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	ep->ep.desc = NULL;
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	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);
748
	if (ep->ep.desc) {
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		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);

772 773
	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
	    !ep->ep.desc)
774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
		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);
789
	if (ep->ep.desc) {
790 791
		list_add_tail(&req->queue, &ep->queue);

792 793
		if ((!ep_is_control(ep) && ep->is_in) ||
			(ep_is_control(ep)
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				&& (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");

902
	if (!ep->ep.desc) {
903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970
		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));
}

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static int usba_udc_wakeup(struct usb_gadget *gadget)
{
	struct usba_udc *udc = to_usba_udc(gadget);
	unsigned long flags;
	u32 ctrl;
	int ret = -EINVAL;

	spin_lock_irqsave(&udc->lock, flags);
	if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
		ctrl = usba_readl(udc, CTRL);
		usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
		ret = 0;
	}
	spin_unlock_irqrestore(&udc->lock, flags);

	return ret;
}

static int
usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
{
	struct usba_udc *udc = to_usba_udc(gadget);
	unsigned long flags;

	spin_lock_irqsave(&udc->lock, flags);
	if (is_selfpowered)
		udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
	else
		udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
	spin_unlock_irqrestore(&udc->lock, flags);

	return 0;
}

1005 1006 1007 1008
static int atmel_usba_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver);
static int atmel_usba_stop(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver);
1009
static const struct usb_gadget_ops usba_udc_ops = {
1010 1011 1012
	.get_frame		= usba_udc_get_frame,
	.wakeup			= usba_udc_wakeup,
	.set_selfpowered	= usba_udc_set_selfpowered,
1013 1014
	.udc_start		= atmel_usba_start,
	.udc_stop		= atmel_usba_stop,
1015 1016 1017 1018 1019 1020 1021
};

static struct usb_endpoint_descriptor usba_ep0_desc = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bEndpointAddress = 0,
	.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1022
	.wMaxPacketSize = cpu_to_le16(64),
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
	/* 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,
		.ep_list	= LIST_HEAD_INIT(the_udc.gadget.ep_list),
1036
		.max_speed	= USB_SPEED_HIGH,
1037 1038
		.name		= "atmel_usba_udc",
		.dev	= {
1039
			.init_name	= "gadget",
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
			.release	= nop_release,
		},
	},
};

/*
 * 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);
	}

1061 1062 1063 1064 1065 1066
	/* NOTE:  normally, the next call to the gadget driver is in
	 * charge of disabling endpoints... usually disconnect().
	 * The exception would be entering a high speed test mode.
	 *
	 * FIXME remove this code ... and retest thoroughly.
	 */
1067
	list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1068
		if (ep->ep.desc) {
1069
			spin_unlock(&udc->lock);
1070
			usba_ep_disable(&ep->ep);
1071 1072
			spin_lock(&udc->lock);
		}
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
	}
}

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;

1086
		if (!ep->ep.desc)
1087
			continue;
1088
		bEndpointAddress = ep->ep.desc->bEndpointAddress;
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194
		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);
1195
			memcpy_toio(ep->fifo, test_packet_buffer,
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
					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)
{
1212
	if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1213 1214 1215 1216 1217 1218
		return true;
	return false;
}

static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
{
1219
	if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1220 1221 1222 1223 1224 1225
		return true;
	return false;
}

static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
{
1226
	if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1227 1228 1229 1230 1231 1232 1233
		return true;
	return false;
}

static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
		struct usb_ctrlrequest *crq)
{
1234
	int retval = 0;
1235 1236 1237 1238 1239 1240

	switch (crq->bRequest) {
	case USB_REQ_GET_STATUS: {
		u16 status;

		if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1241
			status = cpu_to_le16(udc->devstatus);
1242 1243
		} else if (crq->bRequestType
				== (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1244
			status = cpu_to_le16(0);
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
		} 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))
1255
				status |= cpu_to_le16(1);
1256 1257 1258 1259
		} else
			goto delegate;

		/* Write directly to the FIFO. No queueing is done. */
1260
		if (crq->wLength != cpu_to_le16(sizeof(status)))
1261 1262 1263 1264 1265 1266 1267 1268 1269
			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) {
1270 1271 1272 1273
			if (feature_is_dev_remote_wakeup(crq))
				udc->devstatus
					&= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
			else
1274 1275 1276 1277 1278
				/* Can't CLEAR_FEATURE TEST_MODE */
				goto stall;
		} else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
			struct usba_ep *target;

1279
			if (crq->wLength != cpu_to_le16(0)
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305
					|| !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)) {
1306
				udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1307 1308 1309 1310 1311 1312
			} else {
				goto stall;
			}
		} else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
			struct usba_ep *target;

1313
			if (crq->wLength != cpu_to_le16(0)
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347
					|| !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:
1348
	pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
		"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:
1419
			pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
				"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);
1448
			pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
				"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)) {
1493
			pr_warning("udc: Invalid packet length %u "
1494
				"(expected %zu)\n", pkt_len, sizeof(crq));
1495 1496 1497 1498 1499
			set_protocol_stall(udc, ep);
			return;
		}

		DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1500
		memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518

		/* 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 {
1519
			if (crq.crq.wLength != cpu_to_le16(0))
1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
				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) {
1652
		toggle_bias(0);
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663
		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) {
1664
		toggle_bias(1);
1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707
		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);

1708 1709 1710 1711 1712 1713 1714 1715
		if (udc->gadget.speed != USB_SPEED_UNKNOWN
				&& udc->driver->disconnect) {
			udc->gadget.speed = USB_SPEED_UNKNOWN;
			spin_unlock(&udc->lock);
			udc->driver->disconnect(&udc->gadget);
			spin_lock(&udc->lock);
		}

1716
		if (status & USBA_HIGH_SPEED)
1717
			udc->gadget.speed = USB_SPEED_HIGH;
1718
		else
1719
			udc->gadget.speed = USB_SPEED_FULL;
1720 1721
		DBG(DBG_BUS, "%s bus reset detected\n",
		    usb_speed_string(udc->gadget.speed));
1722 1723

		ep0 = &usba_ep[0];
1724
		ep0->ep.desc = &usba_ep0_desc;
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
		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));

1738 1739 1740 1741
		/*
		 * Unclear why we hit this irregularly, e.g. in usbtest,
		 * but it's clearly harmless...
		 */
1742
		if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1743 1744
			dev_dbg(&udc->pdev->dev,
				 "ODD: EP0 configuration is invalid!\n");
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765
	}

	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;

1766
	vbus = vbus_is_present(udc);
1767 1768
	if (vbus != udc->vbus_prev) {
		if (vbus) {
1769 1770
			toggle_bias(1);
			usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1771 1772 1773 1774
			usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
		} else {
			udc->gadget.speed = USB_SPEED_UNKNOWN;
			reset_all_endpoints(udc);
1775 1776
			toggle_bias(0);
			usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1777 1778 1779 1780 1781
			if (udc->driver->disconnect) {
				spin_unlock(&udc->lock);
				udc->driver->disconnect(&udc->gadget);
				spin_lock(&udc->lock);
			}
1782 1783 1784 1785 1786 1787 1788 1789 1790 1791
		}
		udc->vbus_prev = vbus;
	}

out:
	spin_unlock(&udc->lock);

	return IRQ_HANDLED;
}

1792 1793
static int atmel_usba_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
1794
{
1795
	struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1796 1797 1798 1799
	unsigned long flags;

	spin_lock_irqsave(&udc->lock, flags);

1800
	udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1801 1802 1803 1804 1805 1806 1807 1808 1809 1810
	udc->driver = driver;
	udc->gadget.dev.driver = &driver->driver;
	spin_unlock_irqrestore(&udc->lock, flags);

	clk_enable(udc->pclk);
	clk_enable(udc->hclk);

	DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);

	udc->vbus_prev = 0;
1811
	if (gpio_is_valid(udc->vbus_pin))
1812 1813 1814 1815 1816
		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) {
1817 1818
		toggle_bias(1);
		usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1819 1820 1821 1822 1823 1824 1825
		usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
	}
	spin_unlock_irqrestore(&udc->lock, flags);

	return 0;
}

1826 1827
static int atmel_usba_stop(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
1828
{
1829
	struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1830 1831
	unsigned long flags;

1832
	if (gpio_is_valid(udc->vbus_pin))
1833 1834 1835 1836 1837 1838 1839 1840
		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 */
1841 1842
	toggle_bias(0);
	usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864

	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;
}

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);
1865
	if (!regs || !fifo || !pdata)
1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880
		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;
	}

1881
	spin_lock_init(&udc->lock);
1882 1883 1884
	udc->pdev = pdev;
	udc->pclk = pclk;
	udc->hclk = hclk;
1885
	udc->vbus_pin = -ENODEV;
1886 1887

	ret = -ENOMEM;
1888
	udc->regs = ioremap(regs->start, resource_size(regs));
1889 1890 1891 1892 1893 1894
	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);
1895
	udc->fifo = ioremap(fifo->start, resource_size(fifo));
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909
	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);

	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);
1910 1911
	toggle_bias(0);
	usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1912 1913
	clk_disable(pclk);

1914
	usba_ep = kzalloc(sizeof(struct usba_ep) * pdata->num_ep,
1915 1916 1917 1918 1919 1920
			  GFP_KERNEL);
	if (!usba_ep)
		goto err_alloc_ep;

	the_udc.gadget.ep0 = &usba_ep[0].ep;

1921 1922 1923 1924
	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);
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936
	usba_ep[0].ep.ops = &usba_ep_ops;
	usba_ep[0].ep.name = pdata->ep[0].name;
	usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
	usba_ep[0].udc = &the_udc;
	INIT_LIST_HEAD(&usba_ep[0].queue);
	usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
	usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
	usba_ep[0].index = pdata->ep[0].index;
	usba_ep[0].can_dma = pdata->ep[0].can_dma;
	usba_ep[0].can_isoc = pdata->ep[0].can_isoc;

	for (i = 1; i < pdata->num_ep; i++) {
1937 1938 1939 1940 1941
		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);
1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
		ep->ep.ops = &usba_ep_ops;
		ep->ep.name = pdata->ep[i].name;
		ep->ep.maxpacket = pdata->ep[i].fifo_size;
		ep->udc = &the_udc;
		INIT_LIST_HEAD(&ep->queue);
		ep->fifo_size = pdata->ep[i].fifo_size;
		ep->nr_banks = pdata->ep[i].nr_banks;
		ep->index = pdata->ep[i].index;
		ep->can_dma = pdata->ep[i].can_dma;
		ep->can_isoc = pdata->ep[i].can_isoc;
1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963

		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;

1964
	if (gpio_is_valid(pdata->vbus_pin)) {
1965 1966
		if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
			udc->vbus_pin = pdata->vbus_pin;
1967
			udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
1968 1969 1970 1971 1972 1973

			ret = request_irq(gpio_to_irq(udc->vbus_pin),
					usba_vbus_irq, 0,
					"atmel_usba_udc", udc);
			if (ret) {
				gpio_free(udc->vbus_pin);
1974
				udc->vbus_pin = -ENODEV;
1975 1976 1977 1978 1979 1980
				dev_warn(&udc->pdev->dev,
					 "failed to request vbus irq; "
					 "assuming always on\n");
			} else {
				disable_irq(gpio_to_irq(udc->vbus_pin));
			}
1981 1982
		} else {
			/* gpio_request fail so use -EINVAL for gpio_is_valid */
1983
			udc->vbus_pin = -EINVAL;
1984 1985 1986
		}
	}

1987 1988 1989 1990
	ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
	if (ret)
		goto err_add_udc;

1991
	usba_init_debugfs(udc);
1992
	for (i = 1; i < pdata->num_ep; i++)
1993 1994 1995 1996
		usba_ep_init_debugfs(udc, &usba_ep[i]);

	return 0;

1997 1998 1999 2000 2001 2002
err_add_udc:
	if (gpio_is_valid(pdata->vbus_pin)) {
		free_irq(gpio_to_irq(udc->vbus_pin), udc);
		gpio_free(udc->vbus_pin);
	}

2003 2004
	free_irq(irq, udc);
err_request_irq:
2005 2006
	kfree(usba_ep);
err_alloc_ep:
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
	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;
2024
	struct usba_platform_data *pdata = pdev->dev.platform_data;
2025 2026 2027

	udc = platform_get_drvdata(pdev);

2028 2029
	usb_del_gadget_udc(&udc->gadget);

2030
	for (i = 1; i < pdata->num_ep; i++)
2031 2032 2033
		usba_ep_cleanup_debugfs(&usba_ep[i]);
	usba_cleanup_debugfs(udc);

2034 2035
	if (gpio_is_valid(udc->vbus_pin)) {
		free_irq(gpio_to_irq(udc->vbus_pin), udc);
2036
		gpio_free(udc->vbus_pin);
2037
	}
2038 2039

	free_irq(udc->irq, udc);
2040
	kfree(usba_ep);
2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
	iounmap(udc->fifo);
	iounmap(udc->regs);
	clk_put(udc->hclk);
	clk_put(udc->pclk);

	return 0;
}

static struct platform_driver udc_driver = {
	.remove		= __exit_p(usba_udc_remove),
	.driver		= {
		.name		= "atmel_usba_udc",
2053
		.owner		= THIS_MODULE,
2054 2055 2056
	},
};

2057
module_platform_driver_probe(udc_driver, usba_udc_probe);
2058 2059

MODULE_DESCRIPTION("Atmel USBA UDC driver");
J
Jean Delvare 已提交
2060
MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2061
MODULE_LICENSE("GPL");
2062
MODULE_ALIAS("platform:atmel_usba_udc");