at91_udc.c 50.1 KB
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/*
 * at91_udc -- driver for at91-series USB peripheral controller
 *
 * Copyright (C) 2004 by Thomas Rathbone
 * Copyright (C) 2005 by HP Labs
 * Copyright (C) 2005 by David Brownell
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA  02111-1307, USA.
 */

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#undef	VERBOSE_DEBUG
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#undef	PACKET_TRACE

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/clk.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <asm/byteorder.h>
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#include <mach/hardware.h>
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#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
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#include <asm/gpio.h>
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#include <mach/board.h>
#include <mach/cpu.h>
#include <mach/at91sam9261_matrix.h>
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#include "at91_udc.h"


/*
 * This controller is simple and PIO-only.  It's used in many AT91-series
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 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
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 *
 * This driver expects the board has been wired with two GPIOs suppporting
 * a VBUS sensing IRQ, and a D+ pullup.  (They may be omitted, but the
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 * testing hasn't covered such cases.)
 *
 * The pullup is most important (so it's integrated on sam926x parts).  It
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 * provides software control over whether the host enumerates the device.
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 *
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 * The VBUS sensing helps during enumeration, and allows both USB clocks
 * (and the transceiver) to stay gated off until they're necessary, saving
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 * power.  During USB suspend, the 48 MHz clock is gated off in hardware;
 * it may also be gated off by software during some Linux sleep states.
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 */

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#define	DRIVER_VERSION	"3 May 2006"
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static const char driver_name [] = "at91_udc";
static const char ep0name[] = "ep0";

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#define VBUS_POLL_TIMEOUT	msecs_to_jiffies(1000)
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#define at91_udp_read(udc, reg) \
	__raw_readl((udc)->udp_baseaddr + (reg))
#define at91_udp_write(udc, reg, val) \
	__raw_writel((val), (udc)->udp_baseaddr + (reg))
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/*-------------------------------------------------------------------------*/

#ifdef CONFIG_USB_GADGET_DEBUG_FILES

#include <linux/seq_file.h>

static const char debug_filename[] = "driver/udc";

#define FOURBITS "%s%s%s%s"
#define EIGHTBITS FOURBITS FOURBITS

static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
{
	static char		*types[] = {
		"control", "out-iso", "out-bulk", "out-int",
		"BOGUS",   "in-iso",  "in-bulk",  "in-int"};

	u32			csr;
	struct at91_request	*req;
	unsigned long	flags;
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	struct at91_udc	*udc = ep->udc;
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	spin_lock_irqsave(&udc->lock, flags);
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	csr = __raw_readl(ep->creg);

	/* NOTE:  not collecting per-endpoint irq statistics... */

	seq_printf(s, "\n");
	seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
			ep->ep.name, ep->ep.maxpacket,
			ep->is_in ? "in" : "out",
			ep->is_iso ? " iso" : "",
			ep->is_pingpong
				? (ep->fifo_bank ? "pong" : "ping")
				: "",
			ep->stopped ? " stopped" : "");
	seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
		csr,
		(csr & 0x07ff0000) >> 16,
		(csr & (1 << 15)) ? "enabled" : "disabled",
		(csr & (1 << 11)) ? "DATA1" : "DATA0",
		types[(csr & 0x700) >> 8],

		/* iff type is control then print current direction */
		(!(csr & 0x700))
			? ((csr & (1 << 7)) ? " IN" : " OUT")
			: "",
		(csr & (1 << 6)) ? " rxdatabk1" : "",
		(csr & (1 << 5)) ? " forcestall" : "",
		(csr & (1 << 4)) ? " txpktrdy" : "",

		(csr & (1 << 3)) ? " stallsent" : "",
		(csr & (1 << 2)) ? " rxsetup" : "",
		(csr & (1 << 1)) ? " rxdatabk0" : "",
		(csr & (1 << 0)) ? " txcomp" : "");
	if (list_empty (&ep->queue))
		seq_printf(s, "\t(queue empty)\n");

	else list_for_each_entry (req, &ep->queue, queue) {
		unsigned	length = req->req.actual;

		seq_printf(s, "\treq %p len %d/%d buf %p\n",
				&req->req, length,
				req->req.length, req->req.buf);
	}
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	spin_unlock_irqrestore(&udc->lock, flags);
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}

static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
{
	int i;

	seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
		(mask & (1 << 13)) ? " wakeup" : "",
		(mask & (1 << 12)) ? " endbusres" : "",

		(mask & (1 << 11)) ? " sofint" : "",
		(mask & (1 << 10)) ? " extrsm" : "",
		(mask & (1 << 9)) ? " rxrsm" : "",
		(mask & (1 << 8)) ? " rxsusp" : "");
	for (i = 0; i < 8; i++) {
		if (mask & (1 << i))
			seq_printf(s, " ep%d", i);
	}
	seq_printf(s, "\n");
}

static int proc_udc_show(struct seq_file *s, void *unused)
{
	struct at91_udc	*udc = s->private;
	struct at91_ep	*ep;
	u32		tmp;

	seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);

	seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
		udc->vbus ? "present" : "off",
		udc->enabled
			? (udc->vbus ? "active" : "enabled")
			: "disabled",
		udc->selfpowered ? "self" : "VBUS",
		udc->suspended ? ", suspended" : "",
		udc->driver ? udc->driver->driver.name : "(none)");

	/* don't access registers when interface isn't clocked */
	if (!udc->clocked) {
		seq_printf(s, "(not clocked)\n");
		return 0;
	}

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	tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
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	seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
		(tmp & AT91_UDP_FRM_OK) ? " ok" : "",
		(tmp & AT91_UDP_FRM_ERR) ? " err" : "",
		(tmp & AT91_UDP_NUM));

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	tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
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	seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
		(tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
		(tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
		(tmp & AT91_UDP_ESR) ? " esr" : "",
		(tmp & AT91_UDP_CONFG) ? " confg" : "",
		(tmp & AT91_UDP_FADDEN) ? " fadden" : "");

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	tmp = at91_udp_read(udc, AT91_UDP_FADDR);
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	seq_printf(s, "faddr   %03x:%s fadd=%d\n", tmp,
		(tmp & AT91_UDP_FEN) ? " fen" : "",
		(tmp & AT91_UDP_FADD));

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	proc_irq_show(s, "imr   ", at91_udp_read(udc, AT91_UDP_IMR));
	proc_irq_show(s, "isr   ", at91_udp_read(udc, AT91_UDP_ISR));
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	if (udc->enabled && udc->vbus) {
		proc_ep_show(s, &udc->ep[0]);
		list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
			if (ep->desc)
				proc_ep_show(s, ep);
		}
	}
	return 0;
}

static int proc_udc_open(struct inode *inode, struct file *file)
{
	return single_open(file, proc_udc_show, PDE(inode)->data);
}

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static const struct file_operations proc_ops = {
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	.owner		= THIS_MODULE,
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	.open		= proc_udc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static void create_debug_file(struct at91_udc *udc)
{
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	udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
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}

static void remove_debug_file(struct at91_udc *udc)
{
	if (udc->pde)
		remove_proc_entry(debug_filename, NULL);
}

#else

static inline void create_debug_file(struct at91_udc *udc) {}
static inline void remove_debug_file(struct at91_udc *udc) {}

#endif


/*-------------------------------------------------------------------------*/

static void done(struct at91_ep *ep, struct at91_request *req, int status)
{
	unsigned	stopped = ep->stopped;
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	struct at91_udc	*udc = ep->udc;
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	list_del_init(&req->queue);
	if (req->req.status == -EINPROGRESS)
		req->req.status = status;
	else
		status = req->req.status;
	if (status && status != -ESHUTDOWN)
		VDBG("%s done %p, status %d\n", ep->ep.name, req, status);

	ep->stopped = 1;
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	spin_unlock(&udc->lock);
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	req->req.complete(&ep->ep, &req->req);
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	spin_lock(&udc->lock);
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	ep->stopped = stopped;

	/* ep0 is always ready; other endpoints need a non-empty queue */
	if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
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		at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
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}

/*-------------------------------------------------------------------------*/

/* bits indicating OUT fifo has data ready */
#define	RX_DATA_READY	(AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)

/*
 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
 * back most of the value you just read (because of side effects, including
 * bits that may change after reading and before writing).
 *
 * Except when changing a specific bit, always write values which:
 *  - clear SET_FX bits (setting them could change something)
 *  - set CLR_FX bits (clearing them could change something)
 *
 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
 * that shouldn't normally be changed.
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 *
 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
 * implying a need to wait for one write to complete (test relevant bits)
 * before starting the next write.  This shouldn't be an issue given how
 * infrequently we write, except maybe for write-then-read idioms.
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 */
#define	SET_FX	(AT91_UDP_TXPKTRDY)
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#define	CLR_FX	(RX_DATA_READY | AT91_UDP_RXSETUP \
		| AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
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/* pull OUT packet data from the endpoint's fifo */
static int read_fifo (struct at91_ep *ep, struct at91_request *req)
{
	u32 __iomem	*creg = ep->creg;
	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
	u32		csr;
	u8		*buf;
	unsigned int	count, bufferspace, is_done;

	buf = req->req.buf + req->req.actual;
	bufferspace = req->req.length - req->req.actual;

	/*
	 * there might be nothing to read if ep_queue() calls us,
	 * or if we already emptied both pingpong buffers
	 */
rescan:
	csr = __raw_readl(creg);
	if ((csr & RX_DATA_READY) == 0)
		return 0;

	count = (csr & AT91_UDP_RXBYTECNT) >> 16;
	if (count > ep->ep.maxpacket)
		count = ep->ep.maxpacket;
	if (count > bufferspace) {
		DBG("%s buffer overflow\n", ep->ep.name);
		req->req.status = -EOVERFLOW;
		count = bufferspace;
	}
	__raw_readsb(dreg, buf, count);

	/* release and swap pingpong mem bank */
	csr |= CLR_FX;
	if (ep->is_pingpong) {
		if (ep->fifo_bank == 0) {
			csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
			ep->fifo_bank = 1;
		} else {
			csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
			ep->fifo_bank = 0;
		}
	} else
		csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
	__raw_writel(csr, creg);

	req->req.actual += count;
	is_done = (count < ep->ep.maxpacket);
	if (count == bufferspace)
		is_done = 1;

	PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
			is_done ? " (done)" : "");

	/*
	 * avoid extra trips through IRQ logic for packets already in
	 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
	 */
	if (is_done)
		done(ep, req, 0);
	else if (ep->is_pingpong) {
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		/*
		 * One dummy read to delay the code because of a HW glitch:
		 * CSR returns bad RXCOUNT when read too soon after updating
		 * RX_DATA_BK flags.
		 */
		csr = __raw_readl(creg);

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		bufferspace -= count;
		buf += count;
		goto rescan;
	}

	return is_done;
}

/* load fifo for an IN packet */
static int write_fifo(struct at91_ep *ep, struct at91_request *req)
{
	u32 __iomem	*creg = ep->creg;
	u32		csr = __raw_readl(creg);
	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
	unsigned	total, count, is_last;
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	u8		*buf;
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	/*
	 * TODO: allow for writing two packets to the fifo ... that'll
	 * reduce the amount of IN-NAKing, but probably won't affect
	 * throughput much.  (Unlike preventing OUT-NAKing!)
	 */

	/*
	 * If ep_queue() calls us, the queue is empty and possibly in
	 * odd states like TXCOMP not yet cleared (we do it, saving at
	 * least one IRQ) or the fifo not yet being free.  Those aren't
	 * issues normally (IRQ handler fast path).
	 */
	if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
		if (csr & AT91_UDP_TXCOMP) {
			csr |= CLR_FX;
			csr &= ~(SET_FX | AT91_UDP_TXCOMP);
			__raw_writel(csr, creg);
			csr = __raw_readl(creg);
		}
		if (csr & AT91_UDP_TXPKTRDY)
			return 0;
	}

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	buf = req->req.buf + req->req.actual;
	prefetch(buf);
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	total = req->req.length - req->req.actual;
	if (ep->ep.maxpacket < total) {
		count = ep->ep.maxpacket;
		is_last = 0;
	} else {
		count = total;
		is_last = (count < ep->ep.maxpacket) || !req->req.zero;
	}

	/*
	 * Write the packet, maybe it's a ZLP.
	 *
	 * NOTE:  incrementing req->actual before we receive the ACK means
	 * gadget driver IN bytecounts can be wrong in fault cases.  That's
	 * fixable with PIO drivers like this one (save "count" here, and
	 * do the increment later on TX irq), but not for most DMA hardware.
	 *
	 * So all gadget drivers must accept that potential error.  Some
	 * hardware supports precise fifo status reporting, letting them
	 * recover when the actual bytecount matters (e.g. for USB Test
	 * and Measurement Class devices).
	 */
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	__raw_writesb(dreg, buf, count);
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	csr &= ~SET_FX;
	csr |= CLR_FX | AT91_UDP_TXPKTRDY;
	__raw_writel(csr, creg);
	req->req.actual += count;

	PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
			is_last ? " (done)" : "");
	if (is_last)
		done(ep, req, 0);
	return is_last;
}

static void nuke(struct at91_ep *ep, int status)
{
	struct at91_request *req;

	// terminer chaque requete dans la queue
	ep->stopped = 1;
	if (list_empty(&ep->queue))
		return;

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	VDBG("%s %s\n", __func__, ep->ep.name);
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	while (!list_empty(&ep->queue)) {
		req = list_entry(ep->queue.next, struct at91_request, queue);
		done(ep, req, status);
	}
}

/*-------------------------------------------------------------------------*/

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static int at91_ep_enable(struct usb_ep *_ep,
				const struct usb_endpoint_descriptor *desc)
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{
	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
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	struct at91_udc	*udc = ep->udc;
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	u16		maxpacket;
	u32		tmp;
	unsigned long	flags;

	if (!_ep || !ep
			|| !desc || ep->desc
			|| _ep->name == ep0name
			|| desc->bDescriptorType != USB_DT_ENDPOINT
			|| (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0
			|| maxpacket > ep->maxpacket) {
		DBG("bad ep or descriptor\n");
		return -EINVAL;
	}

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	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
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		DBG("bogus device state\n");
		return -ESHUTDOWN;
	}

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	tmp = usb_endpoint_type(desc);
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	switch (tmp) {
	case USB_ENDPOINT_XFER_CONTROL:
		DBG("only one control endpoint\n");
		return -EINVAL;
	case USB_ENDPOINT_XFER_INT:
		if (maxpacket > 64)
			goto bogus_max;
		break;
	case USB_ENDPOINT_XFER_BULK:
		switch (maxpacket) {
		case 8:
		case 16:
		case 32:
		case 64:
			goto ok;
		}
bogus_max:
		DBG("bogus maxpacket %d\n", maxpacket);
		return -EINVAL;
	case USB_ENDPOINT_XFER_ISOC:
		if (!ep->is_pingpong) {
			DBG("iso requires double buffering\n");
			return -EINVAL;
		}
		break;
	}

ok:
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	spin_lock_irqsave(&udc->lock, flags);
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	/* initialize endpoint to match this descriptor */
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	ep->is_in = usb_endpoint_dir_in(desc);
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	ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
	ep->stopped = 0;
	if (ep->is_in)
		tmp |= 0x04;
	tmp <<= 8;
	tmp |= AT91_UDP_EPEDS;
	__raw_writel(tmp, ep->creg);

	ep->desc = desc;
	ep->ep.maxpacket = maxpacket;

	/*
	 * reset/init endpoint fifo.  NOTE:  leaves fifo_bank alone,
	 * since endpoint resets don't reset hw pingpong state.
	 */
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	at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
	at91_udp_write(udc, AT91_UDP_RST_EP, 0);
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	spin_unlock_irqrestore(&udc->lock, flags);
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	return 0;
}

static int at91_ep_disable (struct usb_ep * _ep)
{
	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
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	struct at91_udc	*udc = ep->udc;
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	unsigned long	flags;

	if (ep == &ep->udc->ep[0])
		return -EINVAL;

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	spin_lock_irqsave(&udc->lock, flags);
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	nuke(ep, -ESHUTDOWN);

	/* restore the endpoint's pristine config */
	ep->desc = NULL;
	ep->ep.maxpacket = ep->maxpacket;

	/* reset fifos and endpoint */
	if (ep->udc->clocked) {
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		at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
		at91_udp_write(udc, AT91_UDP_RST_EP, 0);
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		__raw_writel(0, ep->creg);
	}

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	spin_unlock_irqrestore(&udc->lock, flags);
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	return 0;
}

/*
 * this is a PIO-only driver, so there's nothing
 * interesting for request or buffer allocation.
 */

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static struct usb_request *
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at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
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{
	struct at91_request *req;

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	req = kzalloc(sizeof (struct at91_request), gfp_flags);
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	if (!req)
		return NULL;

	INIT_LIST_HEAD(&req->queue);
	return &req->req;
}

static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
{
	struct at91_request *req;

	req = container_of(_req, struct at91_request, req);
	BUG_ON(!list_empty(&req->queue));
	kfree(req);
}

static int at91_ep_queue(struct usb_ep *_ep,
			struct usb_request *_req, gfp_t gfp_flags)
{
	struct at91_request	*req;
	struct at91_ep		*ep;
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	struct at91_udc		*udc;
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	int			status;
	unsigned long		flags;

	req = container_of(_req, struct at91_request, req);
	ep = container_of(_ep, struct at91_ep, ep);

	if (!_req || !_req->complete
			|| !_req->buf || !list_empty(&req->queue)) {
		DBG("invalid request\n");
		return -EINVAL;
	}

	if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
		DBG("invalid ep\n");
		return -EINVAL;
	}

632
	udc = ep->udc;
633

634
	if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
635 636 637 638 639 640 641
		DBG("invalid device\n");
		return -EINVAL;
	}

	_req->status = -EINPROGRESS;
	_req->actual = 0;

642
	spin_lock_irqsave(&udc->lock, flags);
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659

	/* try to kickstart any empty and idle queue */
	if (list_empty(&ep->queue) && !ep->stopped) {
		int	is_ep0;

		/*
		 * If this control request has a non-empty DATA stage, this
		 * will start that stage.  It works just like a non-control
		 * request (until the status stage starts, maybe early).
		 *
		 * If the data stage is empty, then this starts a successful
		 * IN/STATUS stage.  (Unsuccessful ones use set_halt.)
		 */
		is_ep0 = (ep->ep.name == ep0name);
		if (is_ep0) {
			u32	tmp;

660
			if (!udc->req_pending) {
661 662 663 664 665 666 667 668
				status = -EINVAL;
				goto done;
			}

			/*
			 * defer changing CONFG until after the gadget driver
			 * reconfigures the endpoints.
			 */
669 670
			if (udc->wait_for_config_ack) {
				tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
671 672
				tmp ^= AT91_UDP_CONFG;
				VDBG("toggle config\n");
673
				at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
674 675 676 677 678 679 680 681 682
			}
			if (req->req.length == 0) {
ep0_in_status:
				PACKET("ep0 in/status\n");
				status = 0;
				tmp = __raw_readl(ep->creg);
				tmp &= ~SET_FX;
				tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
				__raw_writel(tmp, ep->creg);
683
				udc->req_pending = 0;
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701
				goto done;
			}
		}

		if (ep->is_in)
			status = write_fifo(ep, req);
		else {
			status = read_fifo(ep, req);

			/* IN/STATUS stage is otherwise triggered by irq */
			if (status && is_ep0)
				goto ep0_in_status;
		}
	} else
		status = 0;

	if (req && !status) {
		list_add_tail (&req->queue, &ep->queue);
702
		at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
703 704
	}
done:
705
	spin_unlock_irqrestore(&udc->lock, flags);
706 707 708 709 710
	return (status < 0) ? status : 0;
}

static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
711
	struct at91_ep		*ep;
712
	struct at91_request	*req;
713 714
	unsigned long		flags;
	struct at91_udc		*udc;
715 716 717 718 719

	ep = container_of(_ep, struct at91_ep, ep);
	if (!_ep || ep->ep.name == ep0name)
		return -EINVAL;

720 721 722 723
	udc = ep->udc;

	spin_lock_irqsave(&udc->lock, flags);

724 725 726 727 728
	/* make sure it's actually queued on this endpoint */
	list_for_each_entry (req, &ep->queue, queue) {
		if (&req->req == _req)
			break;
	}
729 730
	if (&req->req != _req) {
		spin_unlock_irqrestore(&udc->lock, flags);
731
		return -EINVAL;
732
	}
733 734

	done(ep, req, -ECONNRESET);
735
	spin_unlock_irqrestore(&udc->lock, flags);
736 737 738 739 740 741
	return 0;
}

static int at91_ep_set_halt(struct usb_ep *_ep, int value)
{
	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
742
	struct at91_udc	*udc = ep->udc;
743 744 745 746 747 748 749 750 751
	u32 __iomem	*creg;
	u32		csr;
	unsigned long	flags;
	int		status = 0;

	if (!_ep || ep->is_iso || !ep->udc->clocked)
		return -EINVAL;

	creg = ep->creg;
752
	spin_lock_irqsave(&udc->lock, flags);
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769

	csr = __raw_readl(creg);

	/*
	 * fail with still-busy IN endpoints, ensuring correct sequencing
	 * of data tx then stall.  note that the fifo rx bytecount isn't
	 * completely accurate as a tx bytecount.
	 */
	if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
		status = -EAGAIN;
	else {
		csr |= CLR_FX;
		csr &= ~SET_FX;
		if (value) {
			csr |= AT91_UDP_FORCESTALL;
			VDBG("halt %s\n", ep->ep.name);
		} else {
770 771
			at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
			at91_udp_write(udc, AT91_UDP_RST_EP, 0);
772 773 774 775 776
			csr &= ~AT91_UDP_FORCESTALL;
		}
		__raw_writel(csr, creg);
	}

777
	spin_unlock_irqrestore(&udc->lock, flags);
778 779 780
	return status;
}

781
static const struct usb_ep_ops at91_ep_ops = {
782 783 784 785 786 787 788 789 790 791 792 793 794 795
	.enable		= at91_ep_enable,
	.disable	= at91_ep_disable,
	.alloc_request	= at91_ep_alloc_request,
	.free_request	= at91_ep_free_request,
	.queue		= at91_ep_queue,
	.dequeue	= at91_ep_dequeue,
	.set_halt	= at91_ep_set_halt,
	// there's only imprecise fifo status reporting
};

/*-------------------------------------------------------------------------*/

static int at91_get_frame(struct usb_gadget *gadget)
{
796 797
	struct at91_udc *udc = to_udc(gadget);

798 799
	if (!to_udc(gadget)->clocked)
		return -EINVAL;
800
	return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
801 802 803 804 805 806 807 808 809
}

static int at91_wakeup(struct usb_gadget *gadget)
{
	struct at91_udc	*udc = to_udc(gadget);
	u32		glbstate;
	int		status = -EINVAL;
	unsigned long	flags;

810
	DBG("%s\n", __func__ );
811
	spin_lock_irqsave(&udc->lock, flags);
812 813 814 815 816 817

	if (!udc->clocked || !udc->suspended)
		goto done;

	/* NOTE:  some "early versions" handle ESR differently ... */

818
	glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
819 820 821
	if (!(glbstate & AT91_UDP_ESR))
		goto done;
	glbstate |= AT91_UDP_ESR;
822
	at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
823 824

done:
825
	spin_unlock_irqrestore(&udc->lock, flags);
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
	return status;
}

/* reinit == restore inital software state */
static void udc_reinit(struct at91_udc *udc)
{
	u32 i;

	INIT_LIST_HEAD(&udc->gadget.ep_list);
	INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);

	for (i = 0; i < NUM_ENDPOINTS; i++) {
		struct at91_ep *ep = &udc->ep[i];

		if (i != 0)
			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
		ep->desc = NULL;
		ep->stopped = 0;
		ep->fifo_bank = 0;
		ep->ep.maxpacket = ep->maxpacket;
846
		ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
847 848 849 850 851 852 853 854 855 856 857 858 859
		// initialiser une queue par endpoint
		INIT_LIST_HEAD(&ep->queue);
	}
}

static void stop_activity(struct at91_udc *udc)
{
	struct usb_gadget_driver *driver = udc->driver;
	int i;

	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
		driver = NULL;
	udc->gadget.speed = USB_SPEED_UNKNOWN;
860
	udc->suspended = 0;
861 862 863 864 865 866

	for (i = 0; i < NUM_ENDPOINTS; i++) {
		struct at91_ep *ep = &udc->ep[i];
		ep->stopped = 1;
		nuke(ep, -ESHUTDOWN);
	}
867 868
	if (driver) {
		spin_unlock(&udc->lock);
869
		driver->disconnect(&udc->gadget);
870 871
		spin_lock(&udc->lock);
	}
872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891

	udc_reinit(udc);
}

static void clk_on(struct at91_udc *udc)
{
	if (udc->clocked)
		return;
	udc->clocked = 1;
	clk_enable(udc->iclk);
	clk_enable(udc->fclk);
}

static void clk_off(struct at91_udc *udc)
{
	if (!udc->clocked)
		return;
	udc->clocked = 0;
	udc->gadget.speed = USB_SPEED_UNKNOWN;
	clk_disable(udc->fclk);
892
	clk_disable(udc->iclk);
893 894 895 896 897 898 899 900
}

/*
 * activate/deactivate link with host; minimize power usage for
 * inactive links by cutting clocks and transceiver power.
 */
static void pullup(struct at91_udc *udc, int is_on)
{
901 902
	int	active = !udc->board.pullup_active_low;

903 904 905
	if (!udc->enabled || !udc->vbus)
		is_on = 0;
	DBG("%sactive\n", is_on ? "" : "in");
906

907 908
	if (is_on) {
		clk_on(udc);
909
		at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
910
		at91_udp_write(udc, AT91_UDP_TXVC, 0);
A
Andrew Victor 已提交
911
		if (cpu_is_at91rm9200())
912
			gpio_set_value(udc->board.pullup_pin, active);
913
		else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
A
Andrew Victor 已提交
914 915 916 917
			u32	txvc = at91_udp_read(udc, AT91_UDP_TXVC);

			txvc |= AT91_UDP_TXVC_PUON;
			at91_udp_write(udc, AT91_UDP_TXVC, txvc);
H
Hong Xu 已提交
918
		} else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
A
Andrew Victor 已提交
919 920 921 922 923 924
			u32	usbpucr;

			usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
			usbpucr |= AT91_MATRIX_USBPUCR_PUON;
			at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
		}
925
	} else {
926
		stop_activity(udc);
927
		at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
928
		at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
A
Andrew Victor 已提交
929
		if (cpu_is_at91rm9200())
930
			gpio_set_value(udc->board.pullup_pin, !active);
931
		else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
A
Andrew Victor 已提交
932 933 934 935
			u32	txvc = at91_udp_read(udc, AT91_UDP_TXVC);

			txvc &= ~AT91_UDP_TXVC_PUON;
			at91_udp_write(udc, AT91_UDP_TXVC, txvc);
H
Hong Xu 已提交
936
		} else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
A
Andrew Victor 已提交
937 938 939 940 941 942
			u32	usbpucr;

			usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
			usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
			at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
		}
943 944 945 946 947 948 949 950 951 952 953
		clk_off(udc);
	}
}

/* vbus is here!  turn everything on that's ready */
static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
{
	struct at91_udc	*udc = to_udc(gadget);
	unsigned long	flags;

	// VDBG("vbus %s\n", is_active ? "on" : "off");
954
	spin_lock_irqsave(&udc->lock, flags);
955
	udc->vbus = (is_active != 0);
956 957 958 959
	if (udc->driver)
		pullup(udc, is_active);
	else
		pullup(udc, 0);
960
	spin_unlock_irqrestore(&udc->lock, flags);
961 962 963 964 965 966 967 968
	return 0;
}

static int at91_pullup(struct usb_gadget *gadget, int is_on)
{
	struct at91_udc	*udc = to_udc(gadget);
	unsigned long	flags;

969
	spin_lock_irqsave(&udc->lock, flags);
970 971
	udc->enabled = is_on = !!is_on;
	pullup(udc, is_on);
972
	spin_unlock_irqrestore(&udc->lock, flags);
973 974 975 976 977 978 979 980
	return 0;
}

static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
{
	struct at91_udc	*udc = to_udc(gadget);
	unsigned long	flags;

981
	spin_lock_irqsave(&udc->lock, flags);
982
	udc->selfpowered = (is_on != 0);
983
	spin_unlock_irqrestore(&udc->lock, flags);
984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 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
	return 0;
}

static const struct usb_gadget_ops at91_udc_ops = {
	.get_frame		= at91_get_frame,
	.wakeup			= at91_wakeup,
	.set_selfpowered	= at91_set_selfpowered,
	.vbus_session		= at91_vbus_session,
	.pullup			= at91_pullup,

	/*
	 * VBUS-powered devices may also also want to support bigger
	 * power budgets after an appropriate SET_CONFIGURATION.
	 */
	// .vbus_power		= at91_vbus_power,
};

/*-------------------------------------------------------------------------*/

static int handle_ep(struct at91_ep *ep)
{
	struct at91_request	*req;
	u32 __iomem		*creg = ep->creg;
	u32			csr = __raw_readl(creg);

	if (!list_empty(&ep->queue))
		req = list_entry(ep->queue.next,
			struct at91_request, queue);
	else
		req = NULL;

	if (ep->is_in) {
		if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
			csr |= CLR_FX;
			csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
			__raw_writel(csr, creg);
		}
		if (req)
			return write_fifo(ep, req);

	} else {
		if (csr & AT91_UDP_STALLSENT) {
			/* STALLSENT bit == ISOERR */
			if (ep->is_iso && req)
				req->req.status = -EILSEQ;
			csr |= CLR_FX;
			csr &= ~(SET_FX | AT91_UDP_STALLSENT);
			__raw_writel(csr, creg);
			csr = __raw_readl(creg);
		}
		if (req && (csr & RX_DATA_READY))
			return read_fifo(ep, req);
	}
	return 0;
}

union setup {
	u8			raw[8];
	struct usb_ctrlrequest	r;
};

static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
{
	u32 __iomem	*creg = ep->creg;
	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
	unsigned	rxcount, i = 0;
	u32		tmp;
	union setup	pkt;
	int		status = 0;

	/* read and ack SETUP; hard-fail for bogus packets */
	rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
	if (likely(rxcount == 8)) {
		while (rxcount--)
			pkt.raw[i++] = __raw_readb(dreg);
		if (pkt.r.bRequestType & USB_DIR_IN) {
			csr |= AT91_UDP_DIR;
			ep->is_in = 1;
		} else {
			csr &= ~AT91_UDP_DIR;
			ep->is_in = 0;
		}
	} else {
		// REVISIT this happens sometimes under load; why??
		ERR("SETUP len %d, csr %08x\n", rxcount, csr);
		status = -EINVAL;
	}
	csr |= CLR_FX;
	csr &= ~(SET_FX | AT91_UDP_RXSETUP);
	__raw_writel(csr, creg);
	udc->wait_for_addr_ack = 0;
	udc->wait_for_config_ack = 0;
	ep->stopped = 0;
	if (unlikely(status != 0))
		goto stall;

#define w_index		le16_to_cpu(pkt.r.wIndex)
#define w_value		le16_to_cpu(pkt.r.wValue)
#define w_length	le16_to_cpu(pkt.r.wLength)

	VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
			pkt.r.bRequestType, pkt.r.bRequest,
			w_value, w_index, w_length);

	/*
	 * A few standard requests get handled here, ones that touch
	 * hardware ... notably for device and endpoint features.
	 */
	udc->req_pending = 1;
	csr = __raw_readl(creg);
	csr |= CLR_FX;
	csr &= ~SET_FX;
	switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {

	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_SET_ADDRESS:
		__raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
		udc->addr = w_value;
		udc->wait_for_addr_ack = 1;
		udc->req_pending = 0;
		/* FADDR is set later, when we ack host STATUS */
		return;

	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_SET_CONFIGURATION:
1109
		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
		if (pkt.r.wValue)
			udc->wait_for_config_ack = (tmp == 0);
		else
			udc->wait_for_config_ack = (tmp != 0);
		if (udc->wait_for_config_ack)
			VDBG("wait for config\n");
		/* CONFG is toggled later, if gadget driver succeeds */
		break;

	/*
	 * Hosts may set or clear remote wakeup status, and
	 * devices may report they're VBUS powered.
	 */
	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_GET_STATUS:
		tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1126
		if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
			tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
		PACKET("get device status\n");
		__raw_writeb(tmp, dreg);
		__raw_writeb(0, dreg);
		goto write_in;
		/* then STATUS starts later, automatically */
	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_SET_FEATURE:
		if (w_value != USB_DEVICE_REMOTE_WAKEUP)
			goto stall;
1137
		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1138
		tmp |= AT91_UDP_ESR;
1139
		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1140 1141 1142 1143 1144
		goto succeed;
	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_CLEAR_FEATURE:
		if (w_value != USB_DEVICE_REMOTE_WAKEUP)
			goto stall;
1145
		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1146
		tmp &= ~AT91_UDP_ESR;
1147
		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
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
		goto succeed;

	/*
	 * Interfaces have no feature settings; this is pretty useless.
	 * we won't even insist the interface exists...
	 */
	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
			| USB_REQ_GET_STATUS:
		PACKET("get interface status\n");
		__raw_writeb(0, dreg);
		__raw_writeb(0, dreg);
		goto write_in;
		/* then STATUS starts later, automatically */
	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
			| USB_REQ_SET_FEATURE:
	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
			| USB_REQ_CLEAR_FEATURE:
		goto stall;

	/*
	 * Hosts may clear bulk/intr endpoint halt after the gadget
	 * driver sets it (not widely used); or set it (for testing)
	 */
	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
			| USB_REQ_GET_STATUS:
		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
		ep = &udc->ep[tmp];
1175
		if (tmp >= NUM_ENDPOINTS || (tmp && !ep->desc))
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
			goto stall;

		if (tmp) {
			if ((w_index & USB_DIR_IN)) {
				if (!ep->is_in)
					goto stall;
			} else if (ep->is_in)
				goto stall;
		}
		PACKET("get %s status\n", ep->ep.name);
		if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
			tmp = (1 << USB_ENDPOINT_HALT);
		else
			tmp = 0;
		__raw_writeb(tmp, dreg);
		__raw_writeb(0, dreg);
		goto write_in;
		/* then STATUS starts later, automatically */
	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
			| USB_REQ_SET_FEATURE:
		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
		ep = &udc->ep[tmp];
1198
		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216
			goto stall;
		if (!ep->desc || ep->is_iso)
			goto stall;
		if ((w_index & USB_DIR_IN)) {
			if (!ep->is_in)
				goto stall;
		} else if (ep->is_in)
			goto stall;

		tmp = __raw_readl(ep->creg);
		tmp &= ~SET_FX;
		tmp |= CLR_FX | AT91_UDP_FORCESTALL;
		__raw_writel(tmp, ep->creg);
		goto succeed;
	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
			| USB_REQ_CLEAR_FEATURE:
		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
		ep = &udc->ep[tmp];
1217
		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228
			goto stall;
		if (tmp == 0)
			goto succeed;
		if (!ep->desc || ep->is_iso)
			goto stall;
		if ((w_index & USB_DIR_IN)) {
			if (!ep->is_in)
				goto stall;
		} else if (ep->is_in)
			goto stall;

1229 1230
		at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
		at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
		tmp = __raw_readl(ep->creg);
		tmp |= CLR_FX;
		tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
		__raw_writel(tmp, ep->creg);
		if (!list_empty(&ep->queue))
			handle_ep(ep);
		goto succeed;
	}

#undef w_value
#undef w_index
#undef w_length

	/* pass request up to the gadget driver */
1245 1246
	if (udc->driver) {
		spin_unlock(&udc->lock);
1247
		status = udc->driver->setup(&udc->gadget, &pkt.r);
1248 1249
		spin_lock(&udc->lock);
	}
1250 1251
	else
		status = -ENODEV;
1252 1253 1254 1255 1256 1257 1258 1259 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 1286 1287 1288 1289 1290 1291 1292 1293 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
	if (status < 0) {
stall:
		VDBG("req %02x.%02x protocol STALL; stat %d\n",
				pkt.r.bRequestType, pkt.r.bRequest, status);
		csr |= AT91_UDP_FORCESTALL;
		__raw_writel(csr, creg);
		udc->req_pending = 0;
	}
	return;

succeed:
	/* immediate successful (IN) STATUS after zero length DATA */
	PACKET("ep0 in/status\n");
write_in:
	csr |= AT91_UDP_TXPKTRDY;
	__raw_writel(csr, creg);
	udc->req_pending = 0;
}

static void handle_ep0(struct at91_udc *udc)
{
	struct at91_ep		*ep0 = &udc->ep[0];
	u32 __iomem		*creg = ep0->creg;
	u32			csr = __raw_readl(creg);
	struct at91_request	*req;

	if (unlikely(csr & AT91_UDP_STALLSENT)) {
		nuke(ep0, -EPROTO);
		udc->req_pending = 0;
		csr |= CLR_FX;
		csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
		__raw_writel(csr, creg);
		VDBG("ep0 stalled\n");
		csr = __raw_readl(creg);
	}
	if (csr & AT91_UDP_RXSETUP) {
		nuke(ep0, 0);
		udc->req_pending = 0;
		handle_setup(udc, ep0, csr);
		return;
	}

	if (list_empty(&ep0->queue))
		req = NULL;
	else
		req = list_entry(ep0->queue.next, struct at91_request, queue);

	/* host ACKed an IN packet that we sent */
	if (csr & AT91_UDP_TXCOMP) {
		csr |= CLR_FX;
		csr &= ~(SET_FX | AT91_UDP_TXCOMP);

		/* write more IN DATA? */
		if (req && ep0->is_in) {
			if (handle_ep(ep0))
				udc->req_pending = 0;

		/*
		 * Ack after:
		 *  - last IN DATA packet (including GET_STATUS)
		 *  - IN/STATUS for OUT DATA
		 *  - IN/STATUS for any zero-length DATA stage
		 * except for the IN DATA case, the host should send
		 * an OUT status later, which we'll ack.
		 */
		} else {
			udc->req_pending = 0;
			__raw_writel(csr, creg);

			/*
			 * SET_ADDRESS takes effect only after the STATUS
			 * (to the original address) gets acked.
			 */
			if (udc->wait_for_addr_ack) {
				u32	tmp;

1328
				at91_udp_write(udc, AT91_UDP_FADDR,
1329
						AT91_UDP_FEN | udc->addr);
1330
				tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1331 1332 1333
				tmp &= ~AT91_UDP_FADDEN;
				if (udc->addr)
					tmp |= AT91_UDP_FADDEN;
1334
				at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
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

				udc->wait_for_addr_ack = 0;
				VDBG("address %d\n", udc->addr);
			}
		}
	}

	/* OUT packet arrived ... */
	else if (csr & AT91_UDP_RX_DATA_BK0) {
		csr |= CLR_FX;
		csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);

		/* OUT DATA stage */
		if (!ep0->is_in) {
			if (req) {
				if (handle_ep(ep0)) {
					/* send IN/STATUS */
					PACKET("ep0 in/status\n");
					csr = __raw_readl(creg);
					csr &= ~SET_FX;
					csr |= CLR_FX | AT91_UDP_TXPKTRDY;
					__raw_writel(csr, creg);
					udc->req_pending = 0;
				}
			} else if (udc->req_pending) {
				/*
				 * AT91 hardware has a hard time with this
				 * "deferred response" mode for control-OUT
				 * transfers.  (For control-IN it's fine.)
				 *
				 * The normal solution leaves OUT data in the
				 * fifo until the gadget driver is ready.
				 * We couldn't do that here without disabling
				 * the IRQ that tells about SETUP packets,
				 * e.g. when the host gets impatient...
				 *
				 * Working around it by copying into a buffer
				 * would almost be a non-deferred response,
				 * except that it wouldn't permit reliable
				 * stalling of the request.  Instead, demand
				 * that gadget drivers not use this mode.
				 */
				DBG("no control-OUT deferred responses!\n");
				__raw_writel(csr | AT91_UDP_FORCESTALL, creg);
				udc->req_pending = 0;
			}

		/* STATUS stage for control-IN; ack.  */
		} else {
			PACKET("ep0 out/status ACK\n");
			__raw_writel(csr, creg);

			/* "early" status stage */
			if (req)
				done(ep0, req, 0);
		}
	}
}

1394
static irqreturn_t at91_udc_irq (int irq, void *_udc)
1395 1396 1397
{
	struct at91_udc		*udc = _udc;
	u32			rescans = 5;
1398
	int			disable_clock = 0;
1399 1400 1401
	unsigned long		flags;

	spin_lock_irqsave(&udc->lock, flags);
1402 1403 1404 1405 1406

	if (!udc->clocked) {
		clk_on(udc);
		disable_clock = 1;
	}
1407 1408

	while (rescans--) {
1409
		u32 status;
1410

1411 1412
		status = at91_udp_read(udc, AT91_UDP_ISR)
			& at91_udp_read(udc, AT91_UDP_IMR);
1413 1414 1415 1416 1417
		if (!status)
			break;

		/* USB reset irq:  not maskable */
		if (status & AT91_UDP_ENDBUSRES) {
1418 1419
			at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
			at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1420
			/* Atmel code clears this irq twice */
1421 1422
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1423 1424 1425 1426 1427
			VDBG("end bus reset\n");
			udc->addr = 0;
			stop_activity(udc);

			/* enable ep0 */
1428
			at91_udp_write(udc, AT91_UDP_CSR(0),
1429
					AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1430 1431
			udc->gadget.speed = USB_SPEED_FULL;
			udc->suspended = 0;
1432
			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1433 1434 1435

			/*
			 * NOTE:  this driver keeps clocks off unless the
1436 1437 1438
			 * USB host is present.  That saves power, but for
			 * boards that don't support VBUS detection, both
			 * clocks need to be active most of the time.
1439 1440 1441 1442
			 */

		/* host initiated suspend (3+ms bus idle) */
		} else if (status & AT91_UDP_RXSUSP) {
1443 1444 1445
			at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456
			// VDBG("bus suspend\n");
			if (udc->suspended)
				continue;
			udc->suspended = 1;

			/*
			 * NOTE:  when suspending a VBUS-powered device, the
			 * gadget driver should switch into slow clock mode
			 * and then into standby to avoid drawing more than
			 * 500uA power (2500uA for some high-power configs).
			 */
1457 1458
			if (udc->driver && udc->driver->suspend) {
				spin_unlock(&udc->lock);
1459
				udc->driver->suspend(&udc->gadget);
1460 1461
				spin_lock(&udc->lock);
			}
1462 1463 1464

		/* host initiated resume */
		} else if (status & AT91_UDP_RXRSM) {
1465 1466 1467
			at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1468 1469 1470 1471 1472 1473 1474 1475 1476 1477
			// VDBG("bus resume\n");
			if (!udc->suspended)
				continue;
			udc->suspended = 0;

			/*
			 * NOTE:  for a VBUS-powered device, the gadget driver
			 * would normally want to switch out of slow clock
			 * mode into normal mode.
			 */
1478 1479
			if (udc->driver && udc->driver->resume) {
				spin_unlock(&udc->lock);
1480
				udc->driver->resume(&udc->gadget);
1481 1482
				spin_lock(&udc->lock);
			}
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500

		/* endpoint IRQs are cleared by handling them */
		} else {
			int		i;
			unsigned	mask = 1;
			struct at91_ep	*ep = &udc->ep[1];

			if (status & mask)
				handle_ep0(udc);
			for (i = 1; i < NUM_ENDPOINTS; i++) {
				mask <<= 1;
				if (status & mask)
					handle_ep(ep);
				ep++;
			}
		}
	}

1501 1502 1503
	if (disable_clock)
		clk_off(udc);

1504 1505
	spin_unlock_irqrestore(&udc->lock, flags);

1506 1507 1508 1509 1510
	return IRQ_HANDLED;
}

/*-------------------------------------------------------------------------*/

1511 1512 1513 1514 1515
static void nop_release(struct device *dev)
{
	/* nothing to free */
}

1516 1517
static struct at91_udc controller = {
	.gadget = {
1518 1519 1520 1521
		.ops	= &at91_udc_ops,
		.ep0	= &controller.ep[0].ep,
		.name	= driver_name,
		.dev	= {
1522
			.init_name = "gadget",
1523
			.release = nop_release,
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
		}
	},
	.ep[0] = {
		.ep = {
			.name	= ep0name,
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.maxpacket	= 8,
		.int_mask	= 1 << 0,
	},
	.ep[1] = {
		.ep = {
			.name	= "ep1",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.is_pingpong	= 1,
		.maxpacket	= 64,
		.int_mask	= 1 << 1,
	},
	.ep[2] = {
		.ep = {
			.name	= "ep2",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.is_pingpong	= 1,
		.maxpacket	= 64,
		.int_mask	= 1 << 2,
	},
	.ep[3] = {
		.ep = {
			/* could actually do bulk too */
			.name	= "ep3-int",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.maxpacket	= 8,
		.int_mask	= 1 << 3,
	},
	.ep[4] = {
		.ep = {
			.name	= "ep4",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.is_pingpong	= 1,
		.maxpacket	= 256,
		.int_mask	= 1 << 4,
	},
	.ep[5] = {
		.ep = {
			.name	= "ep5",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.is_pingpong	= 1,
		.maxpacket	= 256,
		.int_mask	= 1 << 5,
	},
1585
	/* ep6 and ep7 are also reserved (custom silicon might use them) */
1586 1587
};

1588 1589 1590 1591 1592 1593 1594
static void at91_vbus_update(struct at91_udc *udc, unsigned value)
{
	value ^= udc->board.vbus_active_low;
	if (value != udc->vbus)
		at91_vbus_session(&udc->gadget, value);
}

1595
static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1596 1597 1598 1599 1600
{
	struct at91_udc	*udc = _udc;

	/* vbus needs at least brief debouncing */
	udelay(10);
1601
	at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1602 1603 1604 1605

	return IRQ_HANDLED;
}

1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
static void at91_vbus_timer_work(struct work_struct *work)
{
	struct at91_udc *udc = container_of(work, struct at91_udc,
					    vbus_timer_work);

	at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));

	if (!timer_pending(&udc->vbus_timer))
		mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
}

static void at91_vbus_timer(unsigned long data)
{
	struct at91_udc *udc = (struct at91_udc *)data;

	/*
	 * If we are polling vbus it is likely that the gpio is on an
	 * bus such as i2c or spi which may sleep, so schedule some work
	 * to read the vbus gpio
	 */
	if (!work_pending(&udc->vbus_timer_work))
		schedule_work(&udc->vbus_timer_work);
}

1630 1631
int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
		int (*bind)(struct usb_gadget *))
1632 1633 1634
{
	struct at91_udc	*udc = &controller;
	int		retval;
1635
	unsigned long	flags;
1636 1637

	if (!driver
1638
			|| driver->speed < USB_SPEED_FULL
1639
			|| !bind
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
			|| !driver->setup) {
		DBG("bad parameter.\n");
		return -EINVAL;
	}

	if (udc->driver) {
		DBG("UDC already has a gadget driver\n");
		return -EBUSY;
	}

	udc->driver = driver;
	udc->gadget.dev.driver = &driver->driver;
1652
	dev_set_drvdata(&udc->gadget.dev, &driver->driver);
1653 1654 1655
	udc->enabled = 1;
	udc->selfpowered = 1;

1656
	retval = bind(&udc->gadget);
1657
	if (retval) {
1658
		DBG("bind() returned %d\n", retval);
1659
		udc->driver = NULL;
1660
		udc->gadget.dev.driver = NULL;
1661
		dev_set_drvdata(&udc->gadget.dev, NULL);
1662 1663
		udc->enabled = 0;
		udc->selfpowered = 0;
1664 1665 1666
		return retval;
	}

1667
	spin_lock_irqsave(&udc->lock, flags);
1668
	pullup(udc, 1);
1669
	spin_unlock_irqrestore(&udc->lock, flags);
1670 1671 1672 1673

	DBG("bound to %s\n", driver->driver.name);
	return 0;
}
1674
EXPORT_SYMBOL(usb_gadget_probe_driver);
1675 1676 1677 1678

int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
{
	struct at91_udc *udc = &controller;
1679
	unsigned long	flags;
1680

1681
	if (!driver || driver != udc->driver || !driver->unbind)
1682 1683
		return -EINVAL;

1684
	spin_lock_irqsave(&udc->lock, flags);
1685
	udc->enabled = 0;
1686
	at91_udp_write(udc, AT91_UDP_IDR, ~0);
1687
	pullup(udc, 0);
1688
	spin_unlock_irqrestore(&udc->lock, flags);
1689 1690

	driver->unbind(&udc->gadget);
1691
	udc->gadget.dev.driver = NULL;
1692
	dev_set_drvdata(&udc->gadget.dev, NULL);
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703
	udc->driver = NULL;

	DBG("unbound from %s\n", driver->driver.name);
	return 0;
}
EXPORT_SYMBOL (usb_gadget_unregister_driver);

/*-------------------------------------------------------------------------*/

static void at91udc_shutdown(struct platform_device *dev)
{
1704 1705 1706
	struct at91_udc *udc = platform_get_drvdata(dev);
	unsigned long	flags;

1707
	/* force disconnect on reboot */
1708
	spin_lock_irqsave(&udc->lock, flags);
1709
	pullup(platform_get_drvdata(dev), 0);
1710
	spin_unlock_irqrestore(&udc->lock, flags);
1711 1712
}

1713
static int __init at91udc_probe(struct platform_device *pdev)
1714 1715 1716 1717
{
	struct device	*dev = &pdev->dev;
	struct at91_udc	*udc;
	int		retval;
1718
	struct resource	*res;
1719 1720 1721 1722 1723 1724 1725

	if (!dev->platform_data) {
		/* small (so we copy it) but critical! */
		DBG("missing platform_data\n");
		return -ENODEV;
	}

1726
	if (pdev->num_resources != 2) {
1727
		DBG("invalid num_resources\n");
1728 1729 1730 1731
		return -ENODEV;
	}
	if ((pdev->resource[0].flags != IORESOURCE_MEM)
			|| (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1732
		DBG("invalid resource type\n");
1733 1734 1735
		return -ENODEV;
	}

1736 1737 1738 1739
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENXIO;

1740
	if (!request_mem_region(res->start, resource_size(res), driver_name)) {
1741 1742 1743 1744 1745 1746 1747 1748 1749 1750
		DBG("someone's using UDC memory\n");
		return -EBUSY;
	}

	/* init software state */
	udc = &controller;
	udc->gadget.dev.parent = dev;
	udc->board = *(struct at91_udc_data *) dev->platform_data;
	udc->pdev = pdev;
	udc->enabled = 0;
1751
	spin_lock_init(&udc->lock);
1752

1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
	/* rm9200 needs manual D+ pullup; off by default */
	if (cpu_is_at91rm9200()) {
		if (udc->board.pullup_pin <= 0) {
			DBG("no D+ pullup?\n");
			retval = -ENODEV;
			goto fail0;
		}
		retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
		if (retval) {
			DBG("D+ pullup is busy\n");
			goto fail0;
		}
		gpio_direction_output(udc->board.pullup_pin,
				udc->board.pullup_active_low);
	}

1769 1770 1771 1772 1773 1774
	/* newer chips have more FIFO memory than rm9200 */
	if (cpu_is_at91sam9260()) {
		udc->ep[0].maxpacket = 64;
		udc->ep[3].maxpacket = 64;
		udc->ep[4].maxpacket = 512;
		udc->ep[5].maxpacket = 512;
H
Hong Xu 已提交
1775
	} else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1776 1777 1778 1779 1780 1781
		udc->ep[3].maxpacket = 64;
	} else if (cpu_is_at91sam9263()) {
		udc->ep[0].maxpacket = 64;
		udc->ep[3].maxpacket = 64;
	}

1782
	udc->udp_baseaddr = ioremap(res->start, resource_size(res));
1783
	if (!udc->udp_baseaddr) {
1784 1785
		retval = -ENOMEM;
		goto fail0a;
1786 1787 1788 1789
	}

	udc_reinit(udc);

1790 1791 1792 1793 1794
	/* get interface and function clocks */
	udc->iclk = clk_get(dev, "udc_clk");
	udc->fclk = clk_get(dev, "udpck");
	if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
		DBG("clocks missing\n");
A
Andrew Victor 已提交
1795
		retval = -ENODEV;
1796 1797
		/* NOTE: we "know" here that refcounts on these are NOPs */
		goto fail0b;
1798 1799 1800 1801
	}

	retval = device_register(&udc->gadget.dev);
	if (retval < 0)
1802
		goto fail0b;
1803

1804 1805
	/* don't do anything until we have both gadget driver and VBUS */
	clk_enable(udc->iclk);
1806 1807
	at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
	at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
A
Andrew Victor 已提交
1808 1809
	/* Clear all pending interrupts - UDP may be used by bootloader. */
	at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1810
	clk_disable(udc->iclk);
1811 1812

	/* request UDC and maybe VBUS irqs */
1813
	udc->udp_irq = platform_get_irq(pdev, 0);
1814 1815 1816
	retval = request_irq(udc->udp_irq, at91_udc_irq,
			IRQF_DISABLED, driver_name, udc);
	if (retval < 0) {
1817
		DBG("request irq %d failed\n", udc->udp_irq);
1818 1819 1820
		goto fail1;
	}
	if (udc->board.vbus_pin > 0) {
1821 1822 1823 1824 1825 1826 1827
		retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
		if (retval < 0) {
			DBG("request vbus pin failed\n");
			goto fail2;
		}
		gpio_direction_input(udc->board.vbus_pin);

A
Andrew Victor 已提交
1828 1829 1830 1831
		/*
		 * Get the initial state of VBUS - we cannot expect
		 * a pending interrupt.
		 */
1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
		udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
			udc->board.vbus_active_low;

		if (udc->board.vbus_polled) {
			INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
			setup_timer(&udc->vbus_timer, at91_vbus_timer,
				    (unsigned long)udc);
			mod_timer(&udc->vbus_timer,
				  jiffies + VBUS_POLL_TIMEOUT);
		} else {
			if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
					IRQF_DISABLED, driver_name, udc)) {
				DBG("request vbus irq %d failed\n",
				    udc->board.vbus_pin);
				retval = -EBUSY;
				goto fail3;
			}
1849 1850 1851 1852 1853 1854
		}
	} else {
		DBG("no VBUS detection, assuming always-on\n");
		udc->vbus = 1;
	}
	dev_set_drvdata(dev, udc);
1855
	device_init_wakeup(dev, 1);
1856 1857 1858 1859 1860
	create_debug_file(udc);

	INFO("%s version %s\n", driver_name, DRIVER_VERSION);
	return 0;

1861 1862 1863 1864 1865
fail3:
	if (udc->board.vbus_pin > 0)
		gpio_free(udc->board.vbus_pin);
fail2:
	free_irq(udc->udp_irq, udc);
1866 1867
fail1:
	device_unregister(&udc->gadget.dev);
1868 1869 1870 1871 1872
fail0b:
	iounmap(udc->udp_baseaddr);
fail0a:
	if (cpu_is_at91rm9200())
		gpio_free(udc->board.pullup_pin);
1873
fail0:
1874
	release_mem_region(res->start, resource_size(res));
1875 1876 1877 1878
	DBG("%s probe failed, %d\n", driver_name, retval);
	return retval;
}

1879
static int __exit at91udc_remove(struct platform_device *pdev)
1880
{
1881
	struct at91_udc *udc = platform_get_drvdata(pdev);
1882
	struct resource *res;
1883
	unsigned long	flags;
1884 1885 1886

	DBG("remove\n");

1887 1888
	if (udc->driver)
		return -EBUSY;
1889

1890
	spin_lock_irqsave(&udc->lock, flags);
1891
	pullup(udc, 0);
1892
	spin_unlock_irqrestore(&udc->lock, flags);
1893

1894
	device_init_wakeup(&pdev->dev, 0);
1895
	remove_debug_file(udc);
1896
	if (udc->board.vbus_pin > 0) {
1897
		free_irq(udc->board.vbus_pin, udc);
1898 1899
		gpio_free(udc->board.vbus_pin);
	}
1900
	free_irq(udc->udp_irq, udc);
1901
	device_unregister(&udc->gadget.dev);
1902 1903

	iounmap(udc->udp_baseaddr);
1904 1905 1906 1907

	if (cpu_is_at91rm9200())
		gpio_free(udc->board.pullup_pin);

1908
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1909
	release_mem_region(res->start, resource_size(res));
1910 1911 1912 1913 1914 1915 1916 1917

	clk_put(udc->iclk);
	clk_put(udc->fclk);

	return 0;
}

#ifdef CONFIG_PM
1918
static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1919
{
1920 1921
	struct at91_udc *udc = platform_get_drvdata(pdev);
	int		wake = udc->driver && device_may_wakeup(&pdev->dev);
1922
	unsigned long	flags;
1923

1924 1925 1926 1927
	/* Unless we can act normally to the host (letting it wake us up
	 * whenever it has work for us) force disconnect.  Wakeup requires
	 * PLLB for USB events (signaling for reset, wakeup, or incoming
	 * tokens) and VBUS irqs (on systems which support them).
1928
	 */
1929 1930 1931
	if ((!udc->suspended && udc->addr)
			|| !wake
			|| at91_suspend_entering_slow_clock()) {
1932
		spin_lock_irqsave(&udc->lock, flags);
1933
		pullup(udc, 0);
1934
		wake = 0;
1935
		spin_unlock_irqrestore(&udc->lock, flags);
1936 1937 1938
	} else
		enable_irq_wake(udc->udp_irq);

1939
	udc->active_suspend = wake;
1940
	if (udc->board.vbus_pin > 0 && !udc->board.vbus_polled && wake)
1941
		enable_irq_wake(udc->board.vbus_pin);
1942 1943 1944
	return 0;
}

1945
static int at91udc_resume(struct platform_device *pdev)
1946
{
1947
	struct at91_udc *udc = platform_get_drvdata(pdev);
1948
	unsigned long	flags;
1949

1950 1951
	if (udc->board.vbus_pin > 0 && !udc->board.vbus_polled &&
	    udc->active_suspend)
1952 1953
		disable_irq_wake(udc->board.vbus_pin);

1954
	/* maybe reconnect to host; if so, clocks on */
1955 1956
	if (udc->active_suspend)
		disable_irq_wake(udc->udp_irq);
1957 1958
	else {
		spin_lock_irqsave(&udc->lock, flags);
1959
		pullup(udc, 1);
1960 1961
		spin_unlock_irqrestore(&udc->lock, flags);
	}
1962 1963 1964 1965 1966 1967 1968
	return 0;
}
#else
#define	at91udc_suspend	NULL
#define	at91udc_resume	NULL
#endif

1969
static struct platform_driver at91_udc_driver = {
1970
	.remove		= __exit_p(at91udc_remove),
1971 1972
	.shutdown	= at91udc_shutdown,
	.suspend	= at91udc_suspend,
1973
	.resume		= at91udc_resume,
1974 1975 1976 1977 1978 1979
	.driver		= {
		.name	= (char *) driver_name,
		.owner	= THIS_MODULE,
	},
};

1980
static int __init udc_init_module(void)
1981
{
1982
	return platform_driver_probe(&at91_udc_driver, at91udc_probe);
1983 1984 1985
}
module_init(udc_init_module);

1986
static void __exit udc_exit_module(void)
1987
{
1988
	platform_driver_unregister(&at91_udc_driver);
1989 1990 1991
}
module_exit(udc_exit_module);

1992
MODULE_DESCRIPTION("AT91 udc driver");
1993 1994
MODULE_AUTHOR("Thomas Rathbone, David Brownell");
MODULE_LICENSE("GPL");
1995
MODULE_ALIAS("platform:at91_udc");