atmel_usba_udc.c 51.0 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 <linux/of.h>
#include <linux/of_gpio.h>
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#include <asm/gpio.h>

#include "atmel_usba_udc.h"

#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 <linux/clk/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;

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	if (req->using_dma)
		usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
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	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;
	}
648
	ep->ep.desc = NULL;
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711

	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);

	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;
	}

712 713 714
	ret = usb_gadget_map_request(&udc->gadget, &req->req, ep->is_in);
	if (ret)
		return ret;
715

716
	req->using_dma = 1;
717 718 719 720 721 722 723 724 725 726 727 728 729 730
	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);
731
	if (ep->ep.desc) {
732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
		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);

755 756
	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
	    !ep->ep.desc)
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
		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);
772
	if (ep->ep.desc) {
773 774
		list_add_tail(&req->queue, &ep->queue);

775 776
		if ((!ep_is_control(ep) && ep->is_in) ||
			(ep_is_control(ep)
777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884
				&& (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");

885
	if (!ep->ep.desc) {
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953
		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));
}

954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987
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;
}

988 989 990 991
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);
992
static const struct usb_gadget_ops usba_udc_ops = {
993 994 995
	.get_frame		= usba_udc_get_frame,
	.wakeup			= usba_udc_wakeup,
	.set_selfpowered	= usba_udc_set_selfpowered,
996 997
	.udc_start		= atmel_usba_start,
	.udc_stop		= atmel_usba_stop,
998 999 1000 1001 1002 1003 1004
};

static struct usb_endpoint_descriptor usba_ep0_desc = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bEndpointAddress = 0,
	.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1005
	.wMaxPacketSize = cpu_to_le16(64),
1006 1007 1008 1009 1010 1011 1012 1013 1014
	/* FIXME: I have no idea what to put here */
	.bInterval = 1,
};

static void nop_release(struct device *dev)
{

}

1015 1016 1017 1018 1019 1020 1021
struct usb_gadget usba_gadget_template = {
	.ops		= &usba_udc_ops,
	.max_speed	= USB_SPEED_HIGH,
	.name		= "atmel_usba_udc",
	.dev	= {
		.init_name	= "gadget",
		.release	= nop_release,
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
	},
};

/*
 * 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);
	}

1041 1042 1043 1044 1045 1046
	/* 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.
	 */
1047
	list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1048
		if (ep->ep.desc) {
1049
			spin_unlock(&udc->lock);
1050
			usba_ep_disable(&ep->ep);
1051 1052
			spin_lock(&udc->lock);
		}
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
	}
}

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;

1066
		if (!ep->ep.desc)
1067
			continue;
1068
		bEndpointAddress = ep->ep.desc->bEndpointAddress;
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 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
		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
		 */
1145
		ep = &udc->usba_ep[0];
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
		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 */
1163
		ep = &udc->usba_ep[0];
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
		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);
1175
			memcpy_toio(ep->fifo, test_packet_buffer,
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
					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)
{
1192
	if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1193 1194 1195 1196 1197 1198
		return true;
	return false;
}

static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
{
1199
	if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1200 1201 1202 1203 1204 1205
		return true;
	return false;
}

static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
{
1206
	if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1207 1208 1209 1210 1211 1212 1213
		return true;
	return false;
}

static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
		struct usb_ctrlrequest *crq)
{
1214
	int retval = 0;
1215 1216 1217 1218 1219 1220

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

		if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1221
			status = cpu_to_le16(udc->devstatus);
1222 1223
		} else if (crq->bRequestType
				== (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1224
			status = cpu_to_le16(0);
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
		} 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))
1235
				status |= cpu_to_le16(1);
1236 1237 1238 1239
		} else
			goto delegate;

		/* Write directly to the FIFO. No queueing is done. */
1240
		if (crq->wLength != cpu_to_le16(sizeof(status)))
1241 1242 1243 1244 1245 1246 1247 1248 1249
			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) {
1250 1251 1252 1253
			if (feature_is_dev_remote_wakeup(crq))
				udc->devstatus
					&= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
			else
1254 1255 1256 1257 1258
				/* Can't CLEAR_FEATURE TEST_MODE */
				goto stall;
		} else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
			struct usba_ep *target;

1259
			if (crq->wLength != cpu_to_le16(0)
1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
					|| !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)) {
1286
				udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1287 1288 1289 1290 1291 1292
			} else {
				goto stall;
			}
		} else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
			struct usba_ep *target;

1293
			if (crq->wLength != cpu_to_le16(0)
1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327
					|| !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:
1328
	pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 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
		"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:
1399
			pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
				"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);
1428
			pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
				"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)) {
1473
			pr_warning("udc: Invalid packet length %u "
1474
				"(expected %zu)\n", pkt_len, sizeof(crq));
1475 1476 1477 1478 1479
			set_protocol_stall(udc, ep);
			return;
		}

		DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1480
		memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498

		/* 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 {
1499
			if (crq.crq.wLength != cpu_to_le16(0))
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 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
				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) {
1632
		toggle_bias(0);
1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643
		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) {
1644
		toggle_bias(1);
1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
		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))
1666
				usba_dma_irq(udc, &udc->usba_ep[i]);
1667 1668 1669 1670 1671 1672 1673 1674
	}

	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)) {
1675 1676
				if (ep_is_control(&udc->usba_ep[i]))
					usba_control_irq(udc, &udc->usba_ep[i]);
1677
				else
1678
					usba_ep_irq(udc, &udc->usba_ep[i]);
1679 1680 1681 1682 1683 1684 1685 1686 1687
			}
	}

	if (status & USBA_END_OF_RESET) {
		struct usba_ep *ep0;

		usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
		reset_all_endpoints(udc);

1688 1689 1690 1691 1692 1693 1694 1695
		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);
		}

1696
		if (status & USBA_HIGH_SPEED)
1697
			udc->gadget.speed = USB_SPEED_HIGH;
1698
		else
1699
			udc->gadget.speed = USB_SPEED_FULL;
1700 1701
		DBG(DBG_BUS, "%s bus reset detected\n",
		    usb_speed_string(udc->gadget.speed));
1702

1703
		ep0 = &udc->usba_ep[0];
1704
		ep0->ep.desc = &usba_ep0_desc;
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717
		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));

1718 1719 1720 1721
		/*
		 * Unclear why we hit this irregularly, e.g. in usbtest,
		 * but it's clearly harmless...
		 */
1722
		if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1723 1724
			dev_dbg(&udc->pdev->dev,
				 "ODD: EP0 configuration is invalid!\n");
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745
	}

	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;

1746
	vbus = vbus_is_present(udc);
1747 1748
	if (vbus != udc->vbus_prev) {
		if (vbus) {
1749 1750
			toggle_bias(1);
			usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1751 1752 1753 1754
			usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
		} else {
			udc->gadget.speed = USB_SPEED_UNKNOWN;
			reset_all_endpoints(udc);
1755 1756
			toggle_bias(0);
			usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1757 1758 1759 1760 1761
			if (udc->driver->disconnect) {
				spin_unlock(&udc->lock);
				udc->driver->disconnect(&udc->gadget);
				spin_lock(&udc->lock);
			}
1762 1763 1764 1765 1766 1767 1768 1769 1770 1771
		}
		udc->vbus_prev = vbus;
	}

out:
	spin_unlock(&udc->lock);

	return IRQ_HANDLED;
}

1772 1773
static int atmel_usba_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
1774
{
1775
	int ret;
1776
	struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1777 1778 1779 1780
	unsigned long flags;

	spin_lock_irqsave(&udc->lock, flags);

1781
	udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1782 1783 1784
	udc->driver = driver;
	spin_unlock_irqrestore(&udc->lock, flags);

1785 1786
	ret = clk_prepare_enable(udc->pclk);
	if (ret)
1787
		return ret;
1788 1789 1790
	ret = clk_prepare_enable(udc->hclk);
	if (ret) {
		clk_disable_unprepare(udc->pclk);
1791
		return ret;
1792
	}
1793 1794 1795 1796

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

	udc->vbus_prev = 0;
1797
	if (gpio_is_valid(udc->vbus_pin))
1798 1799 1800 1801 1802
		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) {
1803 1804
		toggle_bias(1);
		usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1805 1806 1807 1808
		usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
	}
	spin_unlock_irqrestore(&udc->lock, flags);

1809
	return 0;
1810 1811
}

1812 1813
static int atmel_usba_stop(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
1814
{
1815
	struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1816 1817
	unsigned long flags;

1818
	if (gpio_is_valid(udc->vbus_pin))
1819 1820 1821 1822 1823 1824 1825 1826
		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 */
1827 1828
	toggle_bias(0);
	usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1829 1830 1831

	udc->driver = NULL;

1832 1833
	clk_disable_unprepare(udc->hclk);
	clk_disable_unprepare(udc->pclk);
1834 1835 1836 1837 1838 1839

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

	return 0;
}

1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930
#ifdef CONFIG_OF
static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
						    struct usba_udc *udc)
{
	u32 val;
	const char *name;
	enum of_gpio_flags flags;
	struct device_node *np = pdev->dev.of_node;
	struct device_node *pp;
	int i, ret;
	struct usba_ep *eps, *ep;

	udc->num_ep = 0;

	udc->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
						&flags);
	udc->vbus_pin_inverted = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;

	pp = NULL;
	while ((pp = of_get_next_child(np, pp)))
		udc->num_ep++;

	eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * udc->num_ep,
			   GFP_KERNEL);
	if (!eps)
		return ERR_PTR(-ENOMEM);

	udc->gadget.ep0 = &eps[0].ep;

	INIT_LIST_HEAD(&eps[0].ep.ep_list);

	pp = NULL;
	i = 0;
	while ((pp = of_get_next_child(np, pp))) {
		ep = &eps[i];

		ret = of_property_read_u32(pp, "reg", &val);
		if (ret) {
			dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
			goto err;
		}
		ep->index = val;

		ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
		if (ret) {
			dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
			goto err;
		}
		ep->fifo_size = val;

		ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
		if (ret) {
			dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
			goto err;
		}
		ep->nr_banks = val;

		ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
		ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");

		ret = of_property_read_string(pp, "name", &name);
		ep->ep.name = name;

		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);
		ep->ep.ops = &usba_ep_ops;
		ep->ep.maxpacket = ep->fifo_size;
		ep->udc = udc;
		INIT_LIST_HEAD(&ep->queue);

		if (i)
			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);

		i++;
	}

	return eps;
err:
	return ERR_PTR(ret);
}
#else
static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
						    struct usba_udc *udc)
{
	return ERR_PTR(-ENOSYS);
}
#endif

static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
						 struct usba_udc *udc)
1931
{
J
Jingoo Han 已提交
1932
	struct usba_platform_data *pdata = dev_get_platdata(&pdev->dev);
1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
	struct usba_ep *eps;
	int i;

	if (!pdata)
		return ERR_PTR(-ENXIO);

	eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * pdata->num_ep,
			   GFP_KERNEL);
	if (!eps)
		return ERR_PTR(-ENOMEM);

	udc->gadget.ep0 = &eps[0].ep;

	udc->vbus_pin = pdata->vbus_pin;
	udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
	udc->num_ep = pdata->num_ep;

	INIT_LIST_HEAD(&eps[0].ep.ep_list);

	for (i = 0; i < pdata->num_ep; i++) {
		struct usba_ep *ep = &eps[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);
		ep->ep.ops = &usba_ep_ops;
		ep->ep.name = pdata->ep[i].name;
		ep->fifo_size = ep->ep.maxpacket = pdata->ep[i].fifo_size;
		ep->udc = udc;
		INIT_LIST_HEAD(&ep->queue);
		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;

		if (i)
			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
	}

	return eps;
}

static int __init usba_udc_probe(struct platform_device *pdev)
{
1977 1978
	struct resource *regs, *fifo;
	struct clk *pclk, *hclk;
1979
	struct usba_udc *udc;
1980 1981
	int irq, ret, i;

1982 1983 1984 1985 1986 1987 1988
	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
	if (!udc)
		return -ENOMEM;

	udc->gadget = usba_gadget_template;
	INIT_LIST_HEAD(&udc->gadget.ep_list);

1989 1990
	regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
	fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1991
	if (!regs || !fifo)
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
		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;
	}

2007
	spin_lock_init(&udc->lock);
2008 2009 2010
	udc->pdev = pdev;
	udc->pclk = pclk;
	udc->hclk = hclk;
2011
	udc->vbus_pin = -ENODEV;
2012 2013

	ret = -ENOMEM;
2014
	udc->regs = ioremap(regs->start, resource_size(regs));
2015 2016 2017 2018 2019 2020
	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);
2021
	udc->fifo = ioremap(fifo->start, resource_size(fifo));
2022 2023 2024 2025 2026 2027 2028 2029 2030 2031
	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);

	platform_set_drvdata(pdev, udc);

	/* Make sure we start from a clean slate */
2032 2033 2034 2035 2036
	ret = clk_prepare_enable(pclk);
	if (ret) {
		dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
		goto err_clk_enable;
	}
2037 2038
	toggle_bias(0);
	usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2039
	clk_disable_unprepare(pclk);
2040

2041 2042 2043 2044
	if (pdev->dev.of_node)
		udc->usba_ep = atmel_udc_of_init(pdev, udc);
	else
		udc->usba_ep = usba_udc_pdata(pdev, udc);
2045

2046 2047 2048
	if (IS_ERR(udc->usba_ep)) {
		ret = PTR_ERR(udc->usba_ep);
		goto err_alloc_ep;
2049 2050 2051 2052 2053 2054 2055 2056 2057 2058
	}

	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;

2059 2060
	if (gpio_is_valid(udc->vbus_pin)) {
		if (!devm_gpio_request(&pdev->dev, udc->vbus_pin, "atmel_usba_udc")) {
2061 2062 2063 2064
			ret = request_irq(gpio_to_irq(udc->vbus_pin),
					usba_vbus_irq, 0,
					"atmel_usba_udc", udc);
			if (ret) {
2065
				udc->vbus_pin = -ENODEV;
2066 2067 2068 2069 2070 2071
				dev_warn(&udc->pdev->dev,
					 "failed to request vbus irq; "
					 "assuming always on\n");
			} else {
				disable_irq(gpio_to_irq(udc->vbus_pin));
			}
2072 2073
		} else {
			/* gpio_request fail so use -EINVAL for gpio_is_valid */
2074
			udc->vbus_pin = -EINVAL;
2075 2076 2077
		}
	}

2078 2079 2080 2081
	ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
	if (ret)
		goto err_add_udc;

2082
	usba_init_debugfs(udc);
2083 2084
	for (i = 1; i < udc->num_ep; i++)
		usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2085 2086 2087

	return 0;

2088
err_add_udc:
2089
	if (gpio_is_valid(udc->vbus_pin))
2090 2091
		free_irq(gpio_to_irq(udc->vbus_pin), udc);

2092 2093
	free_irq(irq, udc);
err_request_irq:
2094
err_alloc_ep:
2095
err_clk_enable:
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113
	iounmap(udc->fifo);
err_map_fifo:
	iounmap(udc->regs);
err_map_regs:
	clk_put(hclk);
err_get_hclk:
	clk_put(pclk);

	return ret;
}

static int __exit usba_udc_remove(struct platform_device *pdev)
{
	struct usba_udc *udc;
	int i;

	udc = platform_get_drvdata(pdev);

2114 2115
	usb_del_gadget_udc(&udc->gadget);

2116
	for (i = 1; i < udc->num_ep; i++)
2117
		usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2118 2119
	usba_cleanup_debugfs(udc);

2120 2121 2122
	if (gpio_is_valid(udc->vbus_pin)) {
		free_irq(gpio_to_irq(udc->vbus_pin), udc);
	}
2123 2124 2125 2126 2127 2128 2129 2130 2131 2132

	free_irq(udc->irq, udc);
	iounmap(udc->fifo);
	iounmap(udc->regs);
	clk_put(udc->hclk);
	clk_put(udc->pclk);

	return 0;
}

2133 2134 2135 2136 2137 2138 2139 2140 2141
#if defined(CONFIG_OF)
static const struct of_device_id atmel_udc_dt_ids[] = {
	{ .compatible = "atmel,at91sam9rl-udc" },
	{ /* sentinel */ }
};

MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
#endif

2142 2143 2144 2145
static struct platform_driver udc_driver = {
	.remove		= __exit_p(usba_udc_remove),
	.driver		= {
		.name		= "atmel_usba_udc",
2146
		.owner		= THIS_MODULE,
2147
		.of_match_table	= of_match_ptr(atmel_udc_dt_ids),
2148 2149 2150
	},
};

2151
module_platform_driver_probe(udc_driver, usba_udc_probe);
2152 2153

MODULE_DESCRIPTION("Atmel USBA UDC driver");
J
Jean Delvare 已提交
2154
MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2155
MODULE_LICENSE("GPL");
2156
MODULE_ALIAS("platform:atmel_usba_udc");