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.
 */

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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>
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#include <linux/prefetch.h>
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#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 <linux/of.h>
#include <linux/of_gpio.h>
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#include <linux/platform_data/atmel.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>
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#include <asm/gpio.h>
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#include <mach/cpu.h>
#include <mach/at91sam9261_matrix.h>
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#include <mach/at91_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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 *
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 * This driver expects the board has been wired with two GPIOs supporting
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 * 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) {
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			if (ep->ep.desc)
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				proc_ep_show(s, ep);
		}
	}
	return 0;
}

static int proc_udc_open(struct inode *inode, struct file *file)
{
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	return single_open(file, proc_udc_show, PDE_DATA(inode));
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}

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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;

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	/* terminate any request in the queue */
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	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;
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	u16		maxpacket;
	u32		tmp;
	unsigned long	flags;

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

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	udc = ep->udc;
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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->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 */
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	ep->ep.desc = NULL;
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	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;
	}

619
	if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
620 621 622 623
		DBG("invalid ep\n");
		return -EINVAL;
	}

624
	udc = ep->udc;
625

626
	if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
627 628 629 630 631 632 633
		DBG("invalid device\n");
		return -EINVAL;
	}

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

634
	spin_lock_irqsave(&udc->lock, flags);
635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651

	/* 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;

652
			if (!udc->req_pending) {
653 654 655 656 657 658 659 660
				status = -EINVAL;
				goto done;
			}

			/*
			 * defer changing CONFG until after the gadget driver
			 * reconfigures the endpoints.
			 */
661 662
			if (udc->wait_for_config_ack) {
				tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
663 664
				tmp ^= AT91_UDP_CONFG;
				VDBG("toggle config\n");
665
				at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
666 667 668 669 670 671 672 673 674
			}
			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);
675
				udc->req_pending = 0;
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693
				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);
694
		at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
695 696
	}
done:
697
	spin_unlock_irqrestore(&udc->lock, flags);
698 699 700 701 702
	return (status < 0) ? status : 0;
}

static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
703
	struct at91_ep		*ep;
704
	struct at91_request	*req;
705 706
	unsigned long		flags;
	struct at91_udc		*udc;
707 708 709 710 711

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

712 713 714 715
	udc = ep->udc;

	spin_lock_irqsave(&udc->lock, flags);

716 717 718 719 720
	/* make sure it's actually queued on this endpoint */
	list_for_each_entry (req, &ep->queue, queue) {
		if (&req->req == _req)
			break;
	}
721 722
	if (&req->req != _req) {
		spin_unlock_irqrestore(&udc->lock, flags);
723
		return -EINVAL;
724
	}
725 726

	done(ep, req, -ECONNRESET);
727
	spin_unlock_irqrestore(&udc->lock, flags);
728 729 730 731 732 733
	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);
734
	struct at91_udc	*udc = ep->udc;
735 736 737 738 739 740 741 742 743
	u32 __iomem	*creg;
	u32		csr;
	unsigned long	flags;
	int		status = 0;

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

	creg = ep->creg;
744
	spin_lock_irqsave(&udc->lock, flags);
745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761

	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 {
762 763
			at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
			at91_udp_write(udc, AT91_UDP_RST_EP, 0);
764 765 766 767 768
			csr &= ~AT91_UDP_FORCESTALL;
		}
		__raw_writel(csr, creg);
	}

769
	spin_unlock_irqrestore(&udc->lock, flags);
770 771 772
	return status;
}

773
static const struct usb_ep_ops at91_ep_ops = {
774 775 776 777 778 779 780
	.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,
781
	/* there's only imprecise fifo status reporting */
782 783 784 785 786 787
};

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

static int at91_get_frame(struct usb_gadget *gadget)
{
788 789
	struct at91_udc *udc = to_udc(gadget);

790 791
	if (!to_udc(gadget)->clocked)
		return -EINVAL;
792
	return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
793 794 795 796 797 798 799 800 801
}

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

802
	DBG("%s\n", __func__ );
803
	spin_lock_irqsave(&udc->lock, flags);
804 805 806 807 808 809

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

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

810
	glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
811 812 813
	if (!(glbstate & AT91_UDP_ESR))
		goto done;
	glbstate |= AT91_UDP_ESR;
814
	at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
815 816

done:
817
	spin_unlock_irqrestore(&udc->lock, flags);
818 819 820
	return status;
}

L
Lucas De Marchi 已提交
821
/* reinit == restore initial software state */
822 823 824 825 826 827 828 829 830 831 832 833
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);
834
		ep->ep.desc = NULL;
835 836 837
		ep->stopped = 0;
		ep->fifo_bank = 0;
		ep->ep.maxpacket = ep->maxpacket;
838
		ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
839
		/* initialize one queue per endpoint */
840 841 842 843 844 845 846 847 848 849 850 851
		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;
852
	udc->suspended = 0;
853 854 855 856 857 858

	for (i = 0; i < NUM_ENDPOINTS; i++) {
		struct at91_ep *ep = &udc->ep[i];
		ep->stopped = 1;
		nuke(ep, -ESHUTDOWN);
	}
859 860
	if (driver) {
		spin_unlock(&udc->lock);
861
		driver->disconnect(&udc->gadget);
862 863
		spin_lock(&udc->lock);
	}
864 865 866 867 868 869 870 871 872

	udc_reinit(udc);
}

static void clk_on(struct at91_udc *udc)
{
	if (udc->clocked)
		return;
	udc->clocked = 1;
873 874
	clk_prepare_enable(udc->iclk);
	clk_prepare_enable(udc->fclk);
875 876 877 878 879 880 881 882
}

static void clk_off(struct at91_udc *udc)
{
	if (!udc->clocked)
		return;
	udc->clocked = 0;
	udc->gadget.speed = USB_SPEED_UNKNOWN;
883 884
	clk_disable_unprepare(udc->fclk);
	clk_disable_unprepare(udc->iclk);
885 886 887 888 889 890 891 892
}

/*
 * 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)
{
893 894
	int	active = !udc->board.pullup_active_low;

895 896 897
	if (!udc->enabled || !udc->vbus)
		is_on = 0;
	DBG("%sactive\n", is_on ? "" : "in");
898

899 900
	if (is_on) {
		clk_on(udc);
901
		at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
902
		at91_udp_write(udc, AT91_UDP_TXVC, 0);
A
Andrew Victor 已提交
903
		if (cpu_is_at91rm9200())
904
			gpio_set_value(udc->board.pullup_pin, active);
905
		else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
A
Andrew Victor 已提交
906 907 908 909
			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
910
		} else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
A
Andrew Victor 已提交
911 912
			u32	usbpucr;

913
			usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
A
Andrew Victor 已提交
914
			usbpucr |= AT91_MATRIX_USBPUCR_PUON;
915
			at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
A
Andrew Victor 已提交
916
		}
917
	} else {
918
		stop_activity(udc);
919
		at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
920
		at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
A
Andrew Victor 已提交
921
		if (cpu_is_at91rm9200())
922
			gpio_set_value(udc->board.pullup_pin, !active);
923
		else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
A
Andrew Victor 已提交
924 925 926 927
			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
928
		} else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
A
Andrew Victor 已提交
929 930
			u32	usbpucr;

931
			usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
A
Andrew Victor 已提交
932
			usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
933
			at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
A
Andrew Victor 已提交
934
		}
935 936 937 938 939 940 941 942 943 944
		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;

945
	/* VDBG("vbus %s\n", is_active ? "on" : "off"); */
946
	spin_lock_irqsave(&udc->lock, flags);
947
	udc->vbus = (is_active != 0);
948 949 950 951
	if (udc->driver)
		pullup(udc, is_active);
	else
		pullup(udc, 0);
952
	spin_unlock_irqrestore(&udc->lock, flags);
953 954 955 956 957 958 959 960
	return 0;
}

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

961
	spin_lock_irqsave(&udc->lock, flags);
962 963
	udc->enabled = is_on = !!is_on;
	pullup(udc, is_on);
964
	spin_unlock_irqrestore(&udc->lock, flags);
965 966 967 968 969 970 971 972
	return 0;
}

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

973
	spin_lock_irqsave(&udc->lock, flags);
974
	udc->selfpowered = (is_on != 0);
975
	spin_unlock_irqrestore(&udc->lock, flags);
976 977 978
	return 0;
}

979 980 981 982
static int at91_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver);
static int at91_stop(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver);
983 984 985 986 987 988
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,
989 990
	.udc_start		= at91_start,
	.udc_stop		= at91_stop,
991 992 993 994 995

	/*
	 * VBUS-powered devices may also also want to support bigger
	 * power budgets after an appropriate SET_CONFIGURATION.
	 */
996
	/* .vbus_power		= at91_vbus_power, */
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
};

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

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 {
1065
		/* REVISIT this happens sometimes under load; why?? */
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
		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:
1107
		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
		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);
1124
		if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
			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;
1135
		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1136
		tmp |= AT91_UDP_ESR;
1137
		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1138 1139 1140 1141 1142
		goto succeed;
	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_CLEAR_FEATURE:
		if (w_value != USB_DEVICE_REMOTE_WAKEUP)
			goto stall;
1143
		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1144
		tmp &= ~AT91_UDP_ESR;
1145
		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
		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];
1173
		if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195
			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];
1196
		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1197
			goto stall;
1198
		if (!ep->ep.desc || ep->is_iso)
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
			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];
1215
		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1216 1217 1218
			goto stall;
		if (tmp == 0)
			goto succeed;
1219
		if (!ep->ep.desc || ep->is_iso)
1220 1221 1222 1223 1224 1225 1226
			goto stall;
		if ((w_index & USB_DIR_IN)) {
			if (!ep->is_in)
				goto stall;
		} else if (ep->is_in)
			goto stall;

1227 1228
		at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
		at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
		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 */
1243 1244
	if (udc->driver) {
		spin_unlock(&udc->lock);
1245
		status = udc->driver->setup(&udc->gadget, &pkt.r);
1246 1247
		spin_lock(&udc->lock);
	}
1248 1249
	else
		status = -ENODEV;
1250 1251 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
	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;

1326
				at91_udp_write(udc, AT91_UDP_FADDR,
1327
						AT91_UDP_FEN | udc->addr);
1328
				tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1329 1330 1331
				tmp &= ~AT91_UDP_FADDEN;
				if (udc->addr)
					tmp |= AT91_UDP_FADDEN;
1332
				at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
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

				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);
		}
	}
}

1392
static irqreturn_t at91_udc_irq (int irq, void *_udc)
1393 1394 1395
{
	struct at91_udc		*udc = _udc;
	u32			rescans = 5;
1396
	int			disable_clock = 0;
1397 1398 1399
	unsigned long		flags;

	spin_lock_irqsave(&udc->lock, flags);
1400 1401 1402 1403 1404

	if (!udc->clocked) {
		clk_on(udc);
		disable_clock = 1;
	}
1405 1406

	while (rescans--) {
1407
		u32 status;
1408

1409 1410
		status = at91_udp_read(udc, AT91_UDP_ISR)
			& at91_udp_read(udc, AT91_UDP_IMR);
1411 1412 1413 1414 1415
		if (!status)
			break;

		/* USB reset irq:  not maskable */
		if (status & AT91_UDP_ENDBUSRES) {
1416 1417
			at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
			at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1418
			/* Atmel code clears this irq twice */
1419 1420
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1421 1422 1423 1424 1425
			VDBG("end bus reset\n");
			udc->addr = 0;
			stop_activity(udc);

			/* enable ep0 */
1426
			at91_udp_write(udc, AT91_UDP_CSR(0),
1427
					AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1428 1429
			udc->gadget.speed = USB_SPEED_FULL;
			udc->suspended = 0;
1430
			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1431 1432 1433

			/*
			 * NOTE:  this driver keeps clocks off unless the
1434 1435 1436
			 * 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.
1437 1438 1439 1440
			 */

		/* host initiated suspend (3+ms bus idle) */
		} else if (status & AT91_UDP_RXSUSP) {
1441 1442 1443
			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);
1444
			/* VDBG("bus suspend\n"); */
1445 1446 1447 1448 1449 1450 1451 1452 1453 1454
			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).
			 */
1455 1456
			if (udc->driver && udc->driver->suspend) {
				spin_unlock(&udc->lock);
1457
				udc->driver->suspend(&udc->gadget);
1458 1459
				spin_lock(&udc->lock);
			}
1460 1461 1462

		/* host initiated resume */
		} else if (status & AT91_UDP_RXRSM) {
1463 1464 1465
			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);
1466
			/* VDBG("bus resume\n"); */
1467 1468 1469 1470 1471 1472 1473 1474 1475
			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.
			 */
1476 1477
			if (udc->driver && udc->driver->resume) {
				spin_unlock(&udc->lock);
1478
				udc->driver->resume(&udc->gadget);
1479 1480
				spin_lock(&udc->lock);
			}
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498

		/* 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++;
			}
		}
	}

1499 1500 1501
	if (disable_clock)
		clk_off(udc);

1502 1503
	spin_unlock_irqrestore(&udc->lock, flags);

1504 1505 1506 1507 1508
	return IRQ_HANDLED;
}

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

1509 1510 1511 1512 1513
static void nop_release(struct device *dev)
{
	/* nothing to free */
}

1514 1515
static struct at91_udc controller = {
	.gadget = {
1516 1517 1518 1519
		.ops	= &at91_udc_ops,
		.ep0	= &controller.ep[0].ep,
		.name	= driver_name,
		.dev	= {
1520
			.init_name = "gadget",
1521
			.release = nop_release,
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
		}
	},
	.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,
	},
1583
	/* ep6 and ep7 are also reserved (custom silicon might use them) */
1584 1585
};

1586 1587 1588 1589 1590 1591 1592
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);
}

1593
static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1594 1595 1596 1597 1598
{
	struct at91_udc	*udc = _udc;

	/* vbus needs at least brief debouncing */
	udelay(10);
1599
	at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1600 1601 1602 1603

	return IRQ_HANDLED;
}

1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
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
	 */
1624
	schedule_work(&udc->vbus_timer_work);
1625 1626
}

1627 1628
static int at91_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
1629
{
1630
	struct at91_udc	*udc;
1631

1632
	udc = container_of(gadget, struct at91_udc, gadget);
1633
	udc->driver = driver;
1634
	udc->gadget.dev.of_node = udc->pdev->dev.of_node;
1635 1636 1637 1638 1639 1640 1641
	udc->enabled = 1;
	udc->selfpowered = 1;

	DBG("bound to %s\n", driver->driver.name);
	return 0;
}

1642 1643
static int at91_stop(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
1644
{
1645
	struct at91_udc *udc;
1646
	unsigned long	flags;
1647

1648
	udc = container_of(gadget, struct at91_udc, gadget);
1649
	spin_lock_irqsave(&udc->lock, flags);
1650
	udc->enabled = 0;
1651
	at91_udp_write(udc, AT91_UDP_IDR, ~0);
1652
	spin_unlock_irqrestore(&udc->lock, flags);
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663

	udc->driver = NULL;

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

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

static void at91udc_shutdown(struct platform_device *dev)
{
1664 1665 1666
	struct at91_udc *udc = platform_get_drvdata(dev);
	unsigned long	flags;

1667
	/* force disconnect on reboot */
1668
	spin_lock_irqsave(&udc->lock, flags);
1669
	pullup(platform_get_drvdata(dev), 0);
1670
	spin_unlock_irqrestore(&udc->lock, flags);
1671 1672
}

B
Bill Pemberton 已提交
1673
static void at91udc_of_init(struct at91_udc *udc,
1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
				     struct device_node *np)
{
	struct at91_udc_data *board = &udc->board;
	u32 val;
	enum of_gpio_flags flags;

	if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
		board->vbus_polled = 1;

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

	board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
						  &flags);

	board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
}

B
Bill Pemberton 已提交
1693
static int at91udc_probe(struct platform_device *pdev)
1694 1695 1696 1697
{
	struct device	*dev = &pdev->dev;
	struct at91_udc	*udc;
	int		retval;
1698
	struct resource	*res;
1699

1700
	if (!dev->platform_data && !pdev->dev.of_node) {
1701 1702 1703 1704 1705
		/* small (so we copy it) but critical! */
		DBG("missing platform_data\n");
		return -ENODEV;
	}

1706
	if (pdev->num_resources != 2) {
1707
		DBG("invalid num_resources\n");
1708 1709 1710 1711
		return -ENODEV;
	}
	if ((pdev->resource[0].flags != IORESOURCE_MEM)
			|| (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1712
		DBG("invalid resource type\n");
1713 1714 1715
		return -ENODEV;
	}

1716 1717 1718 1719
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENXIO;

1720
	if (!request_mem_region(res->start, resource_size(res), driver_name)) {
1721 1722 1723 1724 1725 1726 1727
		DBG("someone's using UDC memory\n");
		return -EBUSY;
	}

	/* init software state */
	udc = &controller;
	udc->gadget.dev.parent = dev;
1728
	if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
1729 1730 1731 1732
		at91udc_of_init(udc, pdev->dev.of_node);
	else
		memcpy(&udc->board, dev->platform_data,
		       sizeof(struct at91_udc_data));
1733 1734
	udc->pdev = pdev;
	udc->enabled = 0;
1735
	spin_lock_init(&udc->lock);
1736

1737 1738
	/* rm9200 needs manual D+ pullup; off by default */
	if (cpu_is_at91rm9200()) {
1739
		if (!gpio_is_valid(udc->board.pullup_pin)) {
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752
			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);
	}

1753
	/* newer chips have more FIFO memory than rm9200 */
1754
	if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
1755 1756 1757 1758
		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
1759
	} else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1760 1761 1762 1763 1764 1765
		udc->ep[3].maxpacket = 64;
	} else if (cpu_is_at91sam9263()) {
		udc->ep[0].maxpacket = 64;
		udc->ep[3].maxpacket = 64;
	}

1766
	udc->udp_baseaddr = ioremap(res->start, resource_size(res));
1767
	if (!udc->udp_baseaddr) {
1768 1769
		retval = -ENOMEM;
		goto fail0a;
1770 1771 1772 1773
	}

	udc_reinit(udc);

1774 1775 1776 1777 1778
	/* 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
1779
		retval = -ENODEV;
1780
		/* NOTE: we "know" here that refcounts on these are NOPs */
1781
		goto fail1;
1782
	}
1783

1784
	/* don't do anything until we have both gadget driver and VBUS */
1785 1786 1787
	retval = clk_prepare_enable(udc->iclk);
	if (retval)
		goto fail1;
1788 1789
	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
1790 1791
	/* Clear all pending interrupts - UDP may be used by bootloader. */
	at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1792
	clk_disable_unprepare(udc->iclk);
1793 1794

	/* request UDC and maybe VBUS irqs */
1795
	udc->udp_irq = platform_get_irq(pdev, 0);
1796
	retval = request_irq(udc->udp_irq, at91_udc_irq,
Y
Yong Zhang 已提交
1797
			0, driver_name, udc);
1798
	if (retval < 0) {
1799
		DBG("request irq %d failed\n", udc->udp_irq);
1800 1801
		goto fail1;
	}
1802
	if (gpio_is_valid(udc->board.vbus_pin)) {
1803 1804 1805 1806 1807 1808 1809
		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
1810 1811 1812 1813
		/*
		 * Get the initial state of VBUS - we cannot expect
		 * a pending interrupt.
		 */
1814 1815 1816 1817 1818 1819 1820 1821 1822 1823
		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 {
1824 1825
			if (request_irq(gpio_to_irq(udc->board.vbus_pin),
					at91_vbus_irq, 0, driver_name, udc)) {
1826 1827 1828 1829 1830
				DBG("request vbus irq %d failed\n",
				    udc->board.vbus_pin);
				retval = -EBUSY;
				goto fail3;
			}
1831 1832 1833 1834 1835
		}
	} else {
		DBG("no VBUS detection, assuming always-on\n");
		udc->vbus = 1;
	}
1836 1837 1838
	retval = usb_add_gadget_udc(dev, &udc->gadget);
	if (retval)
		goto fail4;
1839
	dev_set_drvdata(dev, udc);
1840
	device_init_wakeup(dev, 1);
1841 1842 1843 1844
	create_debug_file(udc);

	INFO("%s version %s\n", driver_name, DRIVER_VERSION);
	return 0;
1845
fail4:
1846
	if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled)
1847
		free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
1848
fail3:
1849
	if (gpio_is_valid(udc->board.vbus_pin))
1850 1851 1852
		gpio_free(udc->board.vbus_pin);
fail2:
	free_irq(udc->udp_irq, udc);
1853
fail1:
1854 1855 1856 1857
	iounmap(udc->udp_baseaddr);
fail0a:
	if (cpu_is_at91rm9200())
		gpio_free(udc->board.pullup_pin);
1858
fail0:
1859
	release_mem_region(res->start, resource_size(res));
1860 1861 1862 1863
	DBG("%s probe failed, %d\n", driver_name, retval);
	return retval;
}

1864
static int __exit at91udc_remove(struct platform_device *pdev)
1865
{
1866
	struct at91_udc *udc = platform_get_drvdata(pdev);
1867
	struct resource *res;
1868
	unsigned long	flags;
1869 1870 1871

	DBG("remove\n");

1872
	usb_del_gadget_udc(&udc->gadget);
1873 1874
	if (udc->driver)
		return -EBUSY;
1875

1876
	spin_lock_irqsave(&udc->lock, flags);
1877
	pullup(udc, 0);
1878
	spin_unlock_irqrestore(&udc->lock, flags);
1879

1880
	device_init_wakeup(&pdev->dev, 0);
1881
	remove_debug_file(udc);
1882
	if (gpio_is_valid(udc->board.vbus_pin)) {
1883
		free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
1884 1885
		gpio_free(udc->board.vbus_pin);
	}
1886
	free_irq(udc->udp_irq, udc);
1887
	iounmap(udc->udp_baseaddr);
1888 1889 1890 1891

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

1892
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1893
	release_mem_region(res->start, resource_size(res));
1894 1895 1896 1897 1898 1899 1900 1901

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

	return 0;
}

#ifdef CONFIG_PM
1902
static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1903
{
1904 1905
	struct at91_udc *udc = platform_get_drvdata(pdev);
	int		wake = udc->driver && device_may_wakeup(&pdev->dev);
1906
	unsigned long	flags;
1907

1908 1909 1910 1911
	/* 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).
1912
	 */
1913 1914 1915
	if ((!udc->suspended && udc->addr)
			|| !wake
			|| at91_suspend_entering_slow_clock()) {
1916
		spin_lock_irqsave(&udc->lock, flags);
1917
		pullup(udc, 0);
1918
		wake = 0;
1919
		spin_unlock_irqrestore(&udc->lock, flags);
1920 1921 1922
	} else
		enable_irq_wake(udc->udp_irq);

1923
	udc->active_suspend = wake;
1924
	if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
1925
		enable_irq_wake(udc->board.vbus_pin);
1926 1927 1928
	return 0;
}

1929
static int at91udc_resume(struct platform_device *pdev)
1930
{
1931
	struct at91_udc *udc = platform_get_drvdata(pdev);
1932
	unsigned long	flags;
1933

1934
	if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
1935
	    udc->active_suspend)
1936 1937
		disable_irq_wake(udc->board.vbus_pin);

1938
	/* maybe reconnect to host; if so, clocks on */
1939 1940
	if (udc->active_suspend)
		disable_irq_wake(udc->udp_irq);
1941 1942
	else {
		spin_lock_irqsave(&udc->lock, flags);
1943
		pullup(udc, 1);
1944 1945
		spin_unlock_irqrestore(&udc->lock, flags);
	}
1946 1947 1948 1949 1950 1951 1952
	return 0;
}
#else
#define	at91udc_suspend	NULL
#define	at91udc_resume	NULL
#endif

1953 1954 1955 1956 1957 1958 1959 1960 1961
#if defined(CONFIG_OF)
static const struct of_device_id at91_udc_dt_ids[] = {
	{ .compatible = "atmel,at91rm9200-udc" },
	{ /* sentinel */ }
};

MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
#endif

1962
static struct platform_driver at91_udc_driver = {
1963
	.remove		= __exit_p(at91udc_remove),
1964 1965
	.shutdown	= at91udc_shutdown,
	.suspend	= at91udc_suspend,
1966
	.resume		= at91udc_resume,
1967 1968 1969
	.driver		= {
		.name	= (char *) driver_name,
		.owner	= THIS_MODULE,
1970
		.of_match_table	= of_match_ptr(at91_udc_dt_ids),
1971 1972 1973
	},
};

1974
module_platform_driver_probe(at91_udc_driver, at91udc_probe);
1975

1976
MODULE_DESCRIPTION("AT91 udc driver");
1977 1978
MODULE_AUTHOR("Thomas Rathbone, David Brownell");
MODULE_LICENSE("GPL");
1979
MODULE_ALIAS("platform:at91_udc");