1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * at91_udc -- driver for at91-series USB peripheral controller
   4 *
   5 * Copyright (C) 2004 by Thomas Rathbone
   6 * Copyright (C) 2005 by HP Labs
   7 * Copyright (C) 2005 by David Brownell
   8 */
   9
  10#undef	VERBOSE_DEBUG
  11#undef	PACKET_TRACE
  12
  13#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/platform_device.h>
  16#include <linux/delay.h>
  17#include <linux/ioport.h>
  18#include <linux/slab.h>
  19#include <linux/errno.h>
  20#include <linux/list.h>
  21#include <linux/interrupt.h>
  22#include <linux/proc_fs.h>
  23#include <linux/prefetch.h>
  24#include <linux/clk.h>
  25#include <linux/usb/ch9.h>
  26#include <linux/usb/gadget.h>
  27#include <linux/of.h>
  28#include <linux/gpio/consumer.h>
  29#include <linux/platform_data/atmel.h>
  30#include <linux/regmap.h>
  31#include <linux/mfd/syscon.h>
  32#include <linux/mfd/syscon/atmel-matrix.h>
  33
  34#include "at91_udc.h"
  35
  36
  37/*
  38 * This controller is simple and PIO-only.  It's used in many AT91-series
  39 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
  40 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
  41 *
  42 * This driver expects the board has been wired with two GPIOs supporting
  43 * a VBUS sensing IRQ, and a D+ pullup.  (They may be omitted, but the
  44 * testing hasn't covered such cases.)
  45 *
  46 * The pullup is most important (so it's integrated on sam926x parts).  It
  47 * provides software control over whether the host enumerates the device.
  48 *
  49 * The VBUS sensing helps during enumeration, and allows both USB clocks
  50 * (and the transceiver) to stay gated off until they're necessary, saving
  51 * power.  During USB suspend, the 48 MHz clock is gated off in hardware;
  52 * it may also be gated off by software during some Linux sleep states.
  53 */
  54
  55#define	DRIVER_VERSION	"3 May 2006"
  56
  57static const char driver_name [] = "at91_udc";
  58
  59static const struct {
  60	const char *name;
  61	const struct usb_ep_caps caps;
  62} ep_info[] = {
  63#define EP_INFO(_name, _caps) \
  64	{ \
  65		.name = _name, \
  66		.caps = _caps, \
  67	}
  68
  69	EP_INFO("ep0",
  70		USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
  71	EP_INFO("ep1",
  72		USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  73	EP_INFO("ep2",
  74		USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  75	EP_INFO("ep3-int",
  76		USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_ALL)),
  77	EP_INFO("ep4",
  78		USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  79	EP_INFO("ep5",
  80		USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
  81
  82#undef EP_INFO
  83};
  84
  85#define ep0name		ep_info[0].name
  86
  87#define VBUS_POLL_TIMEOUT	msecs_to_jiffies(1000)
  88
  89#define at91_udp_read(udc, reg) \
  90	__raw_readl((udc)->udp_baseaddr + (reg))
  91#define at91_udp_write(udc, reg, val) \
  92	__raw_writel((val), (udc)->udp_baseaddr + (reg))
  93
  94/*-------------------------------------------------------------------------*/
  95
  96#ifdef CONFIG_USB_GADGET_DEBUG_FILES
  97
  98#include <linux/seq_file.h>
  99
 100static const char debug_filename[] = "driver/udc";
 101
 102#define FOURBITS "%s%s%s%s"
 103#define EIGHTBITS FOURBITS FOURBITS
 104
 105static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
 106{
 107	static char		*types[] = {
 108		"control", "out-iso", "out-bulk", "out-int",
 109		"BOGUS",   "in-iso",  "in-bulk",  "in-int"};
 110
 111	u32			csr;
 112	struct at91_request	*req;
 113	unsigned long	flags;
 114	struct at91_udc	*udc = ep->udc;
 115
 116	spin_lock_irqsave(&udc->lock, flags);
 117
 118	csr = __raw_readl(ep->creg);
 119
 120	/* NOTE:  not collecting per-endpoint irq statistics... */
 121
 122	seq_printf(s, "\n");
 123	seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
 124			ep->ep.name, ep->ep.maxpacket,
 125			ep->is_in ? "in" : "out",
 126			ep->is_iso ? " iso" : "",
 127			ep->is_pingpong
 128				? (ep->fifo_bank ? "pong" : "ping")
 129				: "",
 130			ep->stopped ? " stopped" : "");
 131	seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
 132		csr,
 133		(csr & 0x07ff0000) >> 16,
 134		(csr & (1 << 15)) ? "enabled" : "disabled",
 135		(csr & (1 << 11)) ? "DATA1" : "DATA0",
 136		types[(csr & 0x700) >> 8],
 137
 138		/* iff type is control then print current direction */
 139		(!(csr & 0x700))
 140			? ((csr & (1 << 7)) ? " IN" : " OUT")
 141			: "",
 142		(csr & (1 << 6)) ? " rxdatabk1" : "",
 143		(csr & (1 << 5)) ? " forcestall" : "",
 144		(csr & (1 << 4)) ? " txpktrdy" : "",
 145
 146		(csr & (1 << 3)) ? " stallsent" : "",
 147		(csr & (1 << 2)) ? " rxsetup" : "",
 148		(csr & (1 << 1)) ? " rxdatabk0" : "",
 149		(csr & (1 << 0)) ? " txcomp" : "");
 150	if (list_empty (&ep->queue))
 151		seq_printf(s, "\t(queue empty)\n");
 152
 153	else list_for_each_entry (req, &ep->queue, queue) {
 154		unsigned	length = req->req.actual;
 155
 156		seq_printf(s, "\treq %p len %d/%d buf %p\n",
 157				&req->req, length,
 158				req->req.length, req->req.buf);
 159	}
 160	spin_unlock_irqrestore(&udc->lock, flags);
 161}
 162
 163static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
 164{
 165	int i;
 166
 167	seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
 168		(mask & (1 << 13)) ? " wakeup" : "",
 169		(mask & (1 << 12)) ? " endbusres" : "",
 170
 171		(mask & (1 << 11)) ? " sofint" : "",
 172		(mask & (1 << 10)) ? " extrsm" : "",
 173		(mask & (1 << 9)) ? " rxrsm" : "",
 174		(mask & (1 << 8)) ? " rxsusp" : "");
 175	for (i = 0; i < 8; i++) {
 176		if (mask & (1 << i))
 177			seq_printf(s, " ep%d", i);
 178	}
 179	seq_printf(s, "\n");
 180}
 181
 182static int proc_udc_show(struct seq_file *s, void *unused)
 183{
 184	struct at91_udc	*udc = s->private;
 185	struct at91_ep	*ep;
 186	u32		tmp;
 187
 188	seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
 189
 190	seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
 191		udc->vbus ? "present" : "off",
 192		udc->enabled
 193			? (udc->vbus ? "active" : "enabled")
 194			: "disabled",
 195		udc->gadget.is_selfpowered ? "self" : "VBUS",
 196		udc->suspended ? ", suspended" : "",
 197		udc->driver ? udc->driver->driver.name : "(none)");
 198
 199	/* don't access registers when interface isn't clocked */
 200	if (!udc->clocked) {
 201		seq_printf(s, "(not clocked)\n");
 202		return 0;
 203	}
 204
 205	tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
 206	seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
 207		(tmp & AT91_UDP_FRM_OK) ? " ok" : "",
 208		(tmp & AT91_UDP_FRM_ERR) ? " err" : "",
 209		(tmp & AT91_UDP_NUM));
 210
 211	tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 212	seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
 213		(tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
 214		(tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
 215		(tmp & AT91_UDP_ESR) ? " esr" : "",
 216		(tmp & AT91_UDP_CONFG) ? " confg" : "",
 217		(tmp & AT91_UDP_FADDEN) ? " fadden" : "");
 218
 219	tmp = at91_udp_read(udc, AT91_UDP_FADDR);
 220	seq_printf(s, "faddr   %03x:%s fadd=%d\n", tmp,
 221		(tmp & AT91_UDP_FEN) ? " fen" : "",
 222		(tmp & AT91_UDP_FADD));
 223
 224	proc_irq_show(s, "imr   ", at91_udp_read(udc, AT91_UDP_IMR));
 225	proc_irq_show(s, "isr   ", at91_udp_read(udc, AT91_UDP_ISR));
 226
 227	if (udc->enabled && udc->vbus) {
 228		proc_ep_show(s, &udc->ep[0]);
 229		list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
 230			if (ep->ep.desc)
 231				proc_ep_show(s, ep);
 232		}
 233	}
 234	return 0;
 235}
 236
 237static void create_debug_file(struct at91_udc *udc)
 238{
 239	udc->pde = proc_create_single_data(debug_filename, 0, NULL,
 240			proc_udc_show, udc);
 241}
 242
 243static void remove_debug_file(struct at91_udc *udc)
 244{
 245	if (udc->pde)
 246		remove_proc_entry(debug_filename, NULL);
 247}
 248
 249#else
 250
 251static inline void create_debug_file(struct at91_udc *udc) {}
 252static inline void remove_debug_file(struct at91_udc *udc) {}
 253
 254#endif
 255
 256
 257/*-------------------------------------------------------------------------*/
 258
 259static void done(struct at91_ep *ep, struct at91_request *req, int status)
 260{
 261	unsigned	stopped = ep->stopped;
 262	struct at91_udc	*udc = ep->udc;
 263
 264	list_del_init(&req->queue);
 265	if (req->req.status == -EINPROGRESS)
 266		req->req.status = status;
 267	else
 268		status = req->req.status;
 269	if (status && status != -ESHUTDOWN)
 270		VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
 271
 272	ep->stopped = 1;
 273	spin_unlock(&udc->lock);
 274	usb_gadget_giveback_request(&ep->ep, &req->req);
 275	spin_lock(&udc->lock);
 276	ep->stopped = stopped;
 277
 278	/* ep0 is always ready; other endpoints need a non-empty queue */
 279	if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
 280		at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
 281}
 282
 283/*-------------------------------------------------------------------------*/
 284
 285/* bits indicating OUT fifo has data ready */
 286#define	RX_DATA_READY	(AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
 287
 288/*
 289 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
 290 * back most of the value you just read (because of side effects, including
 291 * bits that may change after reading and before writing).
 292 *
 293 * Except when changing a specific bit, always write values which:
 294 *  - clear SET_FX bits (setting them could change something)
 295 *  - set CLR_FX bits (clearing them could change something)
 296 *
 297 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
 298 * that shouldn't normally be changed.
 299 *
 300 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
 301 * implying a need to wait for one write to complete (test relevant bits)
 302 * before starting the next write.  This shouldn't be an issue given how
 303 * infrequently we write, except maybe for write-then-read idioms.
 304 */
 305#define	SET_FX	(AT91_UDP_TXPKTRDY)
 306#define	CLR_FX	(RX_DATA_READY | AT91_UDP_RXSETUP \
 307		| AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
 308
 309/* pull OUT packet data from the endpoint's fifo */
 310static int read_fifo (struct at91_ep *ep, struct at91_request *req)
 311{
 312	u32 __iomem	*creg = ep->creg;
 313	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
 314	u32		csr;
 315	u8		*buf;
 316	unsigned int	count, bufferspace, is_done;
 317
 318	buf = req->req.buf + req->req.actual;
 319	bufferspace = req->req.length - req->req.actual;
 320
 321	/*
 322	 * there might be nothing to read if ep_queue() calls us,
 323	 * or if we already emptied both pingpong buffers
 324	 */
 325rescan:
 326	csr = __raw_readl(creg);
 327	if ((csr & RX_DATA_READY) == 0)
 328		return 0;
 329
 330	count = (csr & AT91_UDP_RXBYTECNT) >> 16;
 331	if (count > ep->ep.maxpacket)
 332		count = ep->ep.maxpacket;
 333	if (count > bufferspace) {
 334		DBG("%s buffer overflow\n", ep->ep.name);
 335		req->req.status = -EOVERFLOW;
 336		count = bufferspace;
 337	}
 338	__raw_readsb(dreg, buf, count);
 339
 340	/* release and swap pingpong mem bank */
 341	csr |= CLR_FX;
 342	if (ep->is_pingpong) {
 343		if (ep->fifo_bank == 0) {
 344			csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
 345			ep->fifo_bank = 1;
 346		} else {
 347			csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
 348			ep->fifo_bank = 0;
 349		}
 350	} else
 351		csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
 352	__raw_writel(csr, creg);
 353
 354	req->req.actual += count;
 355	is_done = (count < ep->ep.maxpacket);
 356	if (count == bufferspace)
 357		is_done = 1;
 358
 359	PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
 360			is_done ? " (done)" : "");
 361
 362	/*
 363	 * avoid extra trips through IRQ logic for packets already in
 364	 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
 365	 */
 366	if (is_done)
 367		done(ep, req, 0);
 368	else if (ep->is_pingpong) {
 369		/*
 370		 * One dummy read to delay the code because of a HW glitch:
 371		 * CSR returns bad RXCOUNT when read too soon after updating
 372		 * RX_DATA_BK flags.
 373		 */
 374		csr = __raw_readl(creg);
 375
 376		bufferspace -= count;
 377		buf += count;
 378		goto rescan;
 379	}
 380
 381	return is_done;
 382}
 383
 384/* load fifo for an IN packet */
 385static int write_fifo(struct at91_ep *ep, struct at91_request *req)
 386{
 387	u32 __iomem	*creg = ep->creg;
 388	u32		csr = __raw_readl(creg);
 389	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
 390	unsigned	total, count, is_last;
 391	u8		*buf;
 392
 393	/*
 394	 * TODO: allow for writing two packets to the fifo ... that'll
 395	 * reduce the amount of IN-NAKing, but probably won't affect
 396	 * throughput much.  (Unlike preventing OUT-NAKing!)
 397	 */
 398
 399	/*
 400	 * If ep_queue() calls us, the queue is empty and possibly in
 401	 * odd states like TXCOMP not yet cleared (we do it, saving at
 402	 * least one IRQ) or the fifo not yet being free.  Those aren't
 403	 * issues normally (IRQ handler fast path).
 404	 */
 405	if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
 406		if (csr & AT91_UDP_TXCOMP) {
 407			csr |= CLR_FX;
 408			csr &= ~(SET_FX | AT91_UDP_TXCOMP);
 409			__raw_writel(csr, creg);
 410			csr = __raw_readl(creg);
 411		}
 412		if (csr & AT91_UDP_TXPKTRDY)
 413			return 0;
 414	}
 415
 416	buf = req->req.buf + req->req.actual;
 417	prefetch(buf);
 418	total = req->req.length - req->req.actual;
 419	if (ep->ep.maxpacket < total) {
 420		count = ep->ep.maxpacket;
 421		is_last = 0;
 422	} else {
 423		count = total;
 424		is_last = (count < ep->ep.maxpacket) || !req->req.zero;
 425	}
 426
 427	/*
 428	 * Write the packet, maybe it's a ZLP.
 429	 *
 430	 * NOTE:  incrementing req->actual before we receive the ACK means
 431	 * gadget driver IN bytecounts can be wrong in fault cases.  That's
 432	 * fixable with PIO drivers like this one (save "count" here, and
 433	 * do the increment later on TX irq), but not for most DMA hardware.
 434	 *
 435	 * So all gadget drivers must accept that potential error.  Some
 436	 * hardware supports precise fifo status reporting, letting them
 437	 * recover when the actual bytecount matters (e.g. for USB Test
 438	 * and Measurement Class devices).
 439	 */
 440	__raw_writesb(dreg, buf, count);
 441	csr &= ~SET_FX;
 442	csr |= CLR_FX | AT91_UDP_TXPKTRDY;
 443	__raw_writel(csr, creg);
 444	req->req.actual += count;
 445
 446	PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
 447			is_last ? " (done)" : "");
 448	if (is_last)
 449		done(ep, req, 0);
 450	return is_last;
 451}
 452
 453static void nuke(struct at91_ep *ep, int status)
 454{
 455	struct at91_request *req;
 456
 457	/* terminate any request in the queue */
 458	ep->stopped = 1;
 459	if (list_empty(&ep->queue))
 460		return;
 461
 462	VDBG("%s %s\n", __func__, ep->ep.name);
 463	while (!list_empty(&ep->queue)) {
 464		req = list_entry(ep->queue.next, struct at91_request, queue);
 465		done(ep, req, status);
 466	}
 467}
 468
 469/*-------------------------------------------------------------------------*/
 470
 471static int at91_ep_enable(struct usb_ep *_ep,
 472				const struct usb_endpoint_descriptor *desc)
 473{
 474	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
 475	struct at91_udc *udc;
 476	u16		maxpacket;
 477	u32		tmp;
 478	unsigned long	flags;
 479
 480	if (!_ep || !ep
 481			|| !desc || _ep->name == ep0name
 482			|| desc->bDescriptorType != USB_DT_ENDPOINT
 483			|| (maxpacket = usb_endpoint_maxp(desc)) == 0
 484			|| maxpacket > ep->maxpacket) {
 485		DBG("bad ep or descriptor\n");
 486		return -EINVAL;
 487	}
 488
 489	udc = ep->udc;
 490	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 491		DBG("bogus device state\n");
 492		return -ESHUTDOWN;
 493	}
 494
 495	tmp = usb_endpoint_type(desc);
 496	switch (tmp) {
 497	case USB_ENDPOINT_XFER_CONTROL:
 498		DBG("only one control endpoint\n");
 499		return -EINVAL;
 500	case USB_ENDPOINT_XFER_INT:
 501		if (maxpacket > 64)
 502			goto bogus_max;
 503		break;
 504	case USB_ENDPOINT_XFER_BULK:
 505		switch (maxpacket) {
 506		case 8:
 507		case 16:
 508		case 32:
 509		case 64:
 510			goto ok;
 511		}
 512bogus_max:
 513		DBG("bogus maxpacket %d\n", maxpacket);
 514		return -EINVAL;
 515	case USB_ENDPOINT_XFER_ISOC:
 516		if (!ep->is_pingpong) {
 517			DBG("iso requires double buffering\n");
 518			return -EINVAL;
 519		}
 520		break;
 521	}
 522
 523ok:
 524	spin_lock_irqsave(&udc->lock, flags);
 525
 526	/* initialize endpoint to match this descriptor */
 527	ep->is_in = usb_endpoint_dir_in(desc);
 528	ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
 529	ep->stopped = 0;
 530	if (ep->is_in)
 531		tmp |= 0x04;
 532	tmp <<= 8;
 533	tmp |= AT91_UDP_EPEDS;
 534	__raw_writel(tmp, ep->creg);
 535
 536	ep->ep.maxpacket = maxpacket;
 537
 538	/*
 539	 * reset/init endpoint fifo.  NOTE:  leaves fifo_bank alone,
 540	 * since endpoint resets don't reset hw pingpong state.
 541	 */
 542	at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 543	at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 544
 545	spin_unlock_irqrestore(&udc->lock, flags);
 546	return 0;
 547}
 548
 549static int at91_ep_disable (struct usb_ep * _ep)
 550{
 551	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
 552	struct at91_udc	*udc = ep->udc;
 553	unsigned long	flags;
 554
 555	if (ep == &ep->udc->ep[0])
 556		return -EINVAL;
 557
 558	spin_lock_irqsave(&udc->lock, flags);
 559
 560	nuke(ep, -ESHUTDOWN);
 561
 562	/* restore the endpoint's pristine config */
 563	ep->ep.desc = NULL;
 564	ep->ep.maxpacket = ep->maxpacket;
 565
 566	/* reset fifos and endpoint */
 567	if (ep->udc->clocked) {
 568		at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 569		at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 570		__raw_writel(0, ep->creg);
 571	}
 572
 573	spin_unlock_irqrestore(&udc->lock, flags);
 574	return 0;
 575}
 576
 577/*
 578 * this is a PIO-only driver, so there's nothing
 579 * interesting for request or buffer allocation.
 580 */
 581
 582static struct usb_request *
 583at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 584{
 585	struct at91_request *req;
 586
 587	req = kzalloc(sizeof (struct at91_request), gfp_flags);
 588	if (!req)
 589		return NULL;
 590
 591	INIT_LIST_HEAD(&req->queue);
 592	return &req->req;
 593}
 594
 595static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 596{
 597	struct at91_request *req;
 598
 599	req = container_of(_req, struct at91_request, req);
 600	BUG_ON(!list_empty(&req->queue));
 601	kfree(req);
 602}
 603
 604static int at91_ep_queue(struct usb_ep *_ep,
 605			struct usb_request *_req, gfp_t gfp_flags)
 606{
 607	struct at91_request	*req;
 608	struct at91_ep		*ep;
 609	struct at91_udc		*udc;
 610	int			status;
 611	unsigned long		flags;
 612
 613	req = container_of(_req, struct at91_request, req);
 614	ep = container_of(_ep, struct at91_ep, ep);
 615
 616	if (!_req || !_req->complete
 617			|| !_req->buf || !list_empty(&req->queue)) {
 618		DBG("invalid request\n");
 619		return -EINVAL;
 620	}
 621
 622	if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
 623		DBG("invalid ep\n");
 624		return -EINVAL;
 625	}
 626
 627	udc = ep->udc;
 628
 629	if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
 630		DBG("invalid device\n");
 631		return -EINVAL;
 632	}
 633
 634	_req->status = -EINPROGRESS;
 635	_req->actual = 0;
 636
 637	spin_lock_irqsave(&udc->lock, flags);
 638
 639	/* try to kickstart any empty and idle queue */
 640	if (list_empty(&ep->queue) && !ep->stopped) {
 641		int	is_ep0;
 642
 643		/*
 644		 * If this control request has a non-empty DATA stage, this
 645		 * will start that stage.  It works just like a non-control
 646		 * request (until the status stage starts, maybe early).
 647		 *
 648		 * If the data stage is empty, then this starts a successful
 649		 * IN/STATUS stage.  (Unsuccessful ones use set_halt.)
 650		 */
 651		is_ep0 = (ep->ep.name == ep0name);
 652		if (is_ep0) {
 653			u32	tmp;
 654
 655			if (!udc->req_pending) {
 656				status = -EINVAL;
 657				goto done;
 658			}
 659
 660			/*
 661			 * defer changing CONFG until after the gadget driver
 662			 * reconfigures the endpoints.
 663			 */
 664			if (udc->wait_for_config_ack) {
 665				tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 666				tmp ^= AT91_UDP_CONFG;
 667				VDBG("toggle config\n");
 668				at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
 669			}
 670			if (req->req.length == 0) {
 671ep0_in_status:
 672				PACKET("ep0 in/status\n");
 673				status = 0;
 674				tmp = __raw_readl(ep->creg);
 675				tmp &= ~SET_FX;
 676				tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
 677				__raw_writel(tmp, ep->creg);
 678				udc->req_pending = 0;
 679				goto done;
 680			}
 681		}
 682
 683		if (ep->is_in)
 684			status = write_fifo(ep, req);
 685		else {
 686			status = read_fifo(ep, req);
 687
 688			/* IN/STATUS stage is otherwise triggered by irq */
 689			if (status && is_ep0)
 690				goto ep0_in_status;
 691		}
 692	} else
 693		status = 0;
 694
 695	if (req && !status) {
 696		list_add_tail (&req->queue, &ep->queue);
 697		at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
 698	}
 699done:
 700	spin_unlock_irqrestore(&udc->lock, flags);
 701	return (status < 0) ? status : 0;
 702}
 703
 704static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 705{
 706	struct at91_ep		*ep;
 707	struct at91_request	*req = NULL, *iter;
 708	unsigned long		flags;
 709	struct at91_udc		*udc;
 710
 711	ep = container_of(_ep, struct at91_ep, ep);
 712	if (!_ep || ep->ep.name == ep0name)
 713		return -EINVAL;
 714
 715	udc = ep->udc;
 716
 717	spin_lock_irqsave(&udc->lock, flags);
 718
 719	/* make sure it's actually queued on this endpoint */
 720	list_for_each_entry(iter, &ep->queue, queue) {
 721		if (&iter->req != _req)
 722			continue;
 723		req = iter;
 724		break;
 725	}
 726	if (!req) {
 727		spin_unlock_irqrestore(&udc->lock, flags);
 728		return -EINVAL;
 729	}
 730
 731	done(ep, req, -ECONNRESET);
 732	spin_unlock_irqrestore(&udc->lock, flags);
 733	return 0;
 734}
 735
 736static int at91_ep_set_halt(struct usb_ep *_ep, int value)
 737{
 738	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
 739	struct at91_udc	*udc = ep->udc;
 740	u32 __iomem	*creg;
 741	u32		csr;
 742	unsigned long	flags;
 743	int		status = 0;
 744
 745	if (!_ep || ep->is_iso || !ep->udc->clocked)
 746		return -EINVAL;
 747
 748	creg = ep->creg;
 749	spin_lock_irqsave(&udc->lock, flags);
 750
 751	csr = __raw_readl(creg);
 752
 753	/*
 754	 * fail with still-busy IN endpoints, ensuring correct sequencing
 755	 * of data tx then stall.  note that the fifo rx bytecount isn't
 756	 * completely accurate as a tx bytecount.
 757	 */
 758	if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
 759		status = -EAGAIN;
 760	else {
 761		csr |= CLR_FX;
 762		csr &= ~SET_FX;
 763		if (value) {
 764			csr |= AT91_UDP_FORCESTALL;
 765			VDBG("halt %s\n", ep->ep.name);
 766		} else {
 767			at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
 768			at91_udp_write(udc, AT91_UDP_RST_EP, 0);
 769			csr &= ~AT91_UDP_FORCESTALL;
 770		}
 771		__raw_writel(csr, creg);
 772	}
 773
 774	spin_unlock_irqrestore(&udc->lock, flags);
 775	return status;
 776}
 777
 778static const struct usb_ep_ops at91_ep_ops = {
 779	.enable		= at91_ep_enable,
 780	.disable	= at91_ep_disable,
 781	.alloc_request	= at91_ep_alloc_request,
 782	.free_request	= at91_ep_free_request,
 783	.queue		= at91_ep_queue,
 784	.dequeue	= at91_ep_dequeue,
 785	.set_halt	= at91_ep_set_halt,
 786	/* there's only imprecise fifo status reporting */
 787};
 788
 789/*-------------------------------------------------------------------------*/
 790
 791static int at91_get_frame(struct usb_gadget *gadget)
 792{
 793	struct at91_udc *udc = to_udc(gadget);
 794
 795	if (!to_udc(gadget)->clocked)
 796		return -EINVAL;
 797	return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
 798}
 799
 800static int at91_wakeup(struct usb_gadget *gadget)
 801{
 802	struct at91_udc	*udc = to_udc(gadget);
 803	u32		glbstate;
 804	unsigned long	flags;
 805
 806	DBG("%s\n", __func__ );
 807	spin_lock_irqsave(&udc->lock, flags);
 808
 809	if (!udc->clocked || !udc->suspended)
 810		goto done;
 811
 812	/* NOTE:  some "early versions" handle ESR differently ... */
 813
 814	glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
 815	if (!(glbstate & AT91_UDP_ESR))
 816		goto done;
 817	glbstate |= AT91_UDP_ESR;
 818	at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
 819
 820done:
 821	spin_unlock_irqrestore(&udc->lock, flags);
 822	return 0;
 823}
 824
 825/* reinit == restore initial software state */
 826static void udc_reinit(struct at91_udc *udc)
 827{
 828	u32 i;
 829
 830	INIT_LIST_HEAD(&udc->gadget.ep_list);
 831	INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
 832	udc->gadget.quirk_stall_not_supp = 1;
 833
 834	for (i = 0; i < NUM_ENDPOINTS; i++) {
 835		struct at91_ep *ep = &udc->ep[i];
 836
 837		if (i != 0)
 838			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
 839		ep->ep.desc = NULL;
 840		ep->stopped = 0;
 841		ep->fifo_bank = 0;
 842		usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
 843		ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
 844		/* initialize one queue per endpoint */
 845		INIT_LIST_HEAD(&ep->queue);
 846	}
 847}
 848
 849static void reset_gadget(struct at91_udc *udc)
 850{
 851	struct usb_gadget_driver *driver = udc->driver;
 852	int i;
 853
 854	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
 855		driver = NULL;
 856	udc->gadget.speed = USB_SPEED_UNKNOWN;
 857	udc->suspended = 0;
 858
 859	for (i = 0; i < NUM_ENDPOINTS; i++) {
 860		struct at91_ep *ep = &udc->ep[i];
 861
 862		ep->stopped = 1;
 863		nuke(ep, -ESHUTDOWN);
 864	}
 865	if (driver) {
 866		spin_unlock(&udc->lock);
 867		usb_gadget_udc_reset(&udc->gadget, driver);
 868		spin_lock(&udc->lock);
 869	}
 870
 871	udc_reinit(udc);
 872}
 873
 874static void stop_activity(struct at91_udc *udc)
 875{
 876	struct usb_gadget_driver *driver = udc->driver;
 877	int i;
 878
 879	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
 880		driver = NULL;
 881	udc->gadget.speed = USB_SPEED_UNKNOWN;
 882	udc->suspended = 0;
 883
 884	for (i = 0; i < NUM_ENDPOINTS; i++) {
 885		struct at91_ep *ep = &udc->ep[i];
 886		ep->stopped = 1;
 887		nuke(ep, -ESHUTDOWN);
 888	}
 889	if (driver) {
 890		spin_unlock(&udc->lock);
 891		driver->disconnect(&udc->gadget);
 892		spin_lock(&udc->lock);
 893	}
 894
 895	udc_reinit(udc);
 896}
 897
 898static void clk_on(struct at91_udc *udc)
 899{
 900	if (udc->clocked)
 901		return;
 902	udc->clocked = 1;
 903
 904	clk_enable(udc->iclk);
 905	clk_enable(udc->fclk);
 906}
 907
 908static void clk_off(struct at91_udc *udc)
 909{
 910	if (!udc->clocked)
 911		return;
 912	udc->clocked = 0;
 913	udc->gadget.speed = USB_SPEED_UNKNOWN;
 914	clk_disable(udc->fclk);
 915	clk_disable(udc->iclk);
 916}
 917
 918/*
 919 * activate/deactivate link with host; minimize power usage for
 920 * inactive links by cutting clocks and transceiver power.
 921 */
 922static void pullup(struct at91_udc *udc, int is_on)
 923{
 924	if (!udc->enabled || !udc->vbus)
 925		is_on = 0;
 926	DBG("%sactive\n", is_on ? "" : "in");
 927
 928	if (is_on) {
 929		clk_on(udc);
 930		at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
 931		at91_udp_write(udc, AT91_UDP_TXVC, 0);
 932	} else {
 933		stop_activity(udc);
 934		at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
 935		at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
 936		clk_off(udc);
 937	}
 938
 939	if (udc->caps && udc->caps->pullup)
 940		udc->caps->pullup(udc, is_on);
 941}
 942
 943/* vbus is here!  turn everything on that's ready */
 944static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
 945{
 946	struct at91_udc	*udc = to_udc(gadget);
 947	unsigned long	flags;
 948
 949	/* VDBG("vbus %s\n", is_active ? "on" : "off"); */
 950	spin_lock_irqsave(&udc->lock, flags);
 951	udc->vbus = (is_active != 0);
 952	if (udc->driver)
 953		pullup(udc, is_active);
 954	else
 955		pullup(udc, 0);
 956	spin_unlock_irqrestore(&udc->lock, flags);
 957	return 0;
 958}
 959
 960static int at91_pullup(struct usb_gadget *gadget, int is_on)
 961{
 962	struct at91_udc	*udc = to_udc(gadget);
 963	unsigned long	flags;
 964
 965	spin_lock_irqsave(&udc->lock, flags);
 966	udc->enabled = is_on = !!is_on;
 967	pullup(udc, is_on);
 968	spin_unlock_irqrestore(&udc->lock, flags);
 969	return 0;
 970}
 971
 972static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
 973{
 974	struct at91_udc	*udc = to_udc(gadget);
 975	unsigned long	flags;
 976
 977	spin_lock_irqsave(&udc->lock, flags);
 978	gadget->is_selfpowered = (is_on != 0);
 979	spin_unlock_irqrestore(&udc->lock, flags);
 980	return 0;
 981}
 982
 983static int at91_start(struct usb_gadget *gadget,
 984		struct usb_gadget_driver *driver);
 985static int at91_stop(struct usb_gadget *gadget);
 986
 987static const struct usb_gadget_ops at91_udc_ops = {
 988	.get_frame		= at91_get_frame,
 989	.wakeup			= at91_wakeup,
 990	.set_selfpowered	= at91_set_selfpowered,
 991	.vbus_session		= at91_vbus_session,
 992	.pullup			= at91_pullup,
 993	.udc_start		= at91_start,
 994	.udc_stop		= at91_stop,
 995
 996	/*
 997	 * VBUS-powered devices may also want to support bigger
 998	 * power budgets after an appropriate SET_CONFIGURATION.
 999	 */
1000	/* .vbus_power		= at91_vbus_power, */
1001};
1002
1003/*-------------------------------------------------------------------------*/
1004
1005static int handle_ep(struct at91_ep *ep)
1006{
1007	struct at91_request	*req;
1008	u32 __iomem		*creg = ep->creg;
1009	u32			csr = __raw_readl(creg);
1010
1011	if (!list_empty(&ep->queue))
1012		req = list_entry(ep->queue.next,
1013			struct at91_request, queue);
1014	else
1015		req = NULL;
1016
1017	if (ep->is_in) {
1018		if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1019			csr |= CLR_FX;
1020			csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1021			__raw_writel(csr, creg);
1022		}
1023		if (req)
1024			return write_fifo(ep, req);
1025
1026	} else {
1027		if (csr & AT91_UDP_STALLSENT) {
1028			/* STALLSENT bit == ISOERR */
1029			if (ep->is_iso && req)
1030				req->req.status = -EILSEQ;
1031			csr |= CLR_FX;
1032			csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1033			__raw_writel(csr, creg);
1034			csr = __raw_readl(creg);
1035		}
1036		if (req && (csr & RX_DATA_READY))
1037			return read_fifo(ep, req);
1038	}
1039	return 0;
1040}
1041
1042union setup {
1043	u8			raw[8];
1044	struct usb_ctrlrequest	r;
1045};
1046
1047static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1048{
1049	u32 __iomem	*creg = ep->creg;
1050	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1051	unsigned	rxcount, i = 0;
1052	u32		tmp;
1053	union setup	pkt;
1054	int		status = 0;
1055
1056	/* read and ack SETUP; hard-fail for bogus packets */
1057	rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1058	if (likely(rxcount == 8)) {
1059		while (rxcount--)
1060			pkt.raw[i++] = __raw_readb(dreg);
1061		if (pkt.r.bRequestType & USB_DIR_IN) {
1062			csr |= AT91_UDP_DIR;
1063			ep->is_in = 1;
1064		} else {
1065			csr &= ~AT91_UDP_DIR;
1066			ep->is_in = 0;
1067		}
1068	} else {
1069		/* REVISIT this happens sometimes under load; why?? */
1070		ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1071		status = -EINVAL;
1072	}
1073	csr |= CLR_FX;
1074	csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1075	__raw_writel(csr, creg);
1076	udc->wait_for_addr_ack = 0;
1077	udc->wait_for_config_ack = 0;
1078	ep->stopped = 0;
1079	if (unlikely(status != 0))
1080		goto stall;
1081
1082#define w_index		le16_to_cpu(pkt.r.wIndex)
1083#define w_value		le16_to_cpu(pkt.r.wValue)
1084#define w_length	le16_to_cpu(pkt.r.wLength)
1085
1086	VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1087			pkt.r.bRequestType, pkt.r.bRequest,
1088			w_value, w_index, w_length);
1089
1090	/*
1091	 * A few standard requests get handled here, ones that touch
1092	 * hardware ... notably for device and endpoint features.
1093	 */
1094	udc->req_pending = 1;
1095	csr = __raw_readl(creg);
1096	csr |= CLR_FX;
1097	csr &= ~SET_FX;
1098	switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1099
1100	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1101			| USB_REQ_SET_ADDRESS:
1102		__raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1103		udc->addr = w_value;
1104		udc->wait_for_addr_ack = 1;
1105		udc->req_pending = 0;
1106		/* FADDR is set later, when we ack host STATUS */
1107		return;
1108
1109	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1110			| USB_REQ_SET_CONFIGURATION:
1111		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1112		if (pkt.r.wValue)
1113			udc->wait_for_config_ack = (tmp == 0);
1114		else
1115			udc->wait_for_config_ack = (tmp != 0);
1116		if (udc->wait_for_config_ack)
1117			VDBG("wait for config\n");
1118		/* CONFG is toggled later, if gadget driver succeeds */
1119		break;
1120
1121	/*
1122	 * Hosts may set or clear remote wakeup status, and
1123	 * devices may report they're VBUS powered.
1124	 */
1125	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1126			| USB_REQ_GET_STATUS:
1127		tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED);
1128		if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1129			tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1130		PACKET("get device status\n");
1131		__raw_writeb(tmp, dreg);
1132		__raw_writeb(0, dreg);
1133		goto write_in;
1134		/* then STATUS starts later, automatically */
1135	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1136			| USB_REQ_SET_FEATURE:
1137		if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1138			goto stall;
1139		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1140		tmp |= AT91_UDP_ESR;
1141		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1142		goto succeed;
1143	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1144			| USB_REQ_CLEAR_FEATURE:
1145		if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1146			goto stall;
1147		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1148		tmp &= ~AT91_UDP_ESR;
1149		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1150		goto succeed;
1151
1152	/*
1153	 * Interfaces have no feature settings; this is pretty useless.
1154	 * we won't even insist the interface exists...
1155	 */
1156	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1157			| USB_REQ_GET_STATUS:
1158		PACKET("get interface status\n");
1159		__raw_writeb(0, dreg);
1160		__raw_writeb(0, dreg);
1161		goto write_in;
1162		/* then STATUS starts later, automatically */
1163	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1164			| USB_REQ_SET_FEATURE:
1165	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1166			| USB_REQ_CLEAR_FEATURE:
1167		goto stall;
1168
1169	/*
1170	 * Hosts may clear bulk/intr endpoint halt after the gadget
1171	 * driver sets it (not widely used); or set it (for testing)
1172	 */
1173	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1174			| USB_REQ_GET_STATUS:
1175		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1176		ep = &udc->ep[tmp];
1177		if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1178			goto stall;
1179
1180		if (tmp) {
1181			if ((w_index & USB_DIR_IN)) {
1182				if (!ep->is_in)
1183					goto stall;
1184			} else if (ep->is_in)
1185				goto stall;
1186		}
1187		PACKET("get %s status\n", ep->ep.name);
1188		if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1189			tmp = (1 << USB_ENDPOINT_HALT);
1190		else
1191			tmp = 0;
1192		__raw_writeb(tmp, dreg);
1193		__raw_writeb(0, dreg);
1194		goto write_in;
1195		/* then STATUS starts later, automatically */
1196	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1197			| USB_REQ_SET_FEATURE:
1198		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1199		ep = &udc->ep[tmp];
1200		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1201			goto stall;
1202		if (!ep->ep.desc || ep->is_iso)
1203			goto stall;
1204		if ((w_index & USB_DIR_IN)) {
1205			if (!ep->is_in)
1206				goto stall;
1207		} else if (ep->is_in)
1208			goto stall;
1209
1210		tmp = __raw_readl(ep->creg);
1211		tmp &= ~SET_FX;
1212		tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1213		__raw_writel(tmp, ep->creg);
1214		goto succeed;
1215	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1216			| USB_REQ_CLEAR_FEATURE:
1217		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1218		ep = &udc->ep[tmp];
1219		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1220			goto stall;
1221		if (tmp == 0)
1222			goto succeed;
1223		if (!ep->ep.desc || ep->is_iso)
1224			goto stall;
1225		if ((w_index & USB_DIR_IN)) {
1226			if (!ep->is_in)
1227				goto stall;
1228		} else if (ep->is_in)
1229			goto stall;
1230
1231		at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1232		at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1233		tmp = __raw_readl(ep->creg);
1234		tmp |= CLR_FX;
1235		tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1236		__raw_writel(tmp, ep->creg);
1237		if (!list_empty(&ep->queue))
1238			handle_ep(ep);
1239		goto succeed;
1240	}
1241
1242#undef w_value
1243#undef w_index
1244#undef w_length
1245
1246	/* pass request up to the gadget driver */
1247	if (udc->driver) {
1248		spin_unlock(&udc->lock);
1249		status = udc->driver->setup(&udc->gadget, &pkt.r);
1250		spin_lock(&udc->lock);
1251	}
1252	else
1253		status = -ENODEV;
1254	if (status < 0) {
1255stall:
1256		VDBG("req %02x.%02x protocol STALL; stat %d\n",
1257				pkt.r.bRequestType, pkt.r.bRequest, status);
1258		csr |= AT91_UDP_FORCESTALL;
1259		__raw_writel(csr, creg);
1260		udc->req_pending = 0;
1261	}
1262	return;
1263
1264succeed:
1265	/* immediate successful (IN) STATUS after zero length DATA */
1266	PACKET("ep0 in/status\n");
1267write_in:
1268	csr |= AT91_UDP_TXPKTRDY;
1269	__raw_writel(csr, creg);
1270	udc->req_pending = 0;
1271}
1272
1273static void handle_ep0(struct at91_udc *udc)
1274{
1275	struct at91_ep		*ep0 = &udc->ep[0];
1276	u32 __iomem		*creg = ep0->creg;
1277	u32			csr = __raw_readl(creg);
1278	struct at91_request	*req;
1279
1280	if (unlikely(csr & AT91_UDP_STALLSENT)) {
1281		nuke(ep0, -EPROTO);
1282		udc->req_pending = 0;
1283		csr |= CLR_FX;
1284		csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1285		__raw_writel(csr, creg);
1286		VDBG("ep0 stalled\n");
1287		csr = __raw_readl(creg);
1288	}
1289	if (csr & AT91_UDP_RXSETUP) {
1290		nuke(ep0, 0);
1291		udc->req_pending = 0;
1292		handle_setup(udc, ep0, csr);
1293		return;
1294	}
1295
1296	if (list_empty(&ep0->queue))
1297		req = NULL;
1298	else
1299		req = list_entry(ep0->queue.next, struct at91_request, queue);
1300
1301	/* host ACKed an IN packet that we sent */
1302	if (csr & AT91_UDP_TXCOMP) {
1303		csr |= CLR_FX;
1304		csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1305
1306		/* write more IN DATA? */
1307		if (req && ep0->is_in) {
1308			if (handle_ep(ep0))
1309				udc->req_pending = 0;
1310
1311		/*
1312		 * Ack after:
1313		 *  - last IN DATA packet (including GET_STATUS)
1314		 *  - IN/STATUS for OUT DATA
1315		 *  - IN/STATUS for any zero-length DATA stage
1316		 * except for the IN DATA case, the host should send
1317		 * an OUT status later, which we'll ack.
1318		 */
1319		} else {
1320			udc->req_pending = 0;
1321			__raw_writel(csr, creg);
1322
1323			/*
1324			 * SET_ADDRESS takes effect only after the STATUS
1325			 * (to the original address) gets acked.
1326			 */
1327			if (udc->wait_for_addr_ack) {
1328				u32	tmp;
1329
1330				at91_udp_write(udc, AT91_UDP_FADDR,
1331						AT91_UDP_FEN | udc->addr);
1332				tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1333				tmp &= ~AT91_UDP_FADDEN;
1334				if (udc->addr)
1335					tmp |= AT91_UDP_FADDEN;
1336				at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1337
1338				udc->wait_for_addr_ack = 0;
1339				VDBG("address %d\n", udc->addr);
1340			}
1341		}
1342	}
1343
1344	/* OUT packet arrived ... */
1345	else if (csr & AT91_UDP_RX_DATA_BK0) {
1346		csr |= CLR_FX;
1347		csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1348
1349		/* OUT DATA stage */
1350		if (!ep0->is_in) {
1351			if (req) {
1352				if (handle_ep(ep0)) {
1353					/* send IN/STATUS */
1354					PACKET("ep0 in/status\n");
1355					csr = __raw_readl(creg);
1356					csr &= ~SET_FX;
1357					csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1358					__raw_writel(csr, creg);
1359					udc->req_pending = 0;
1360				}
1361			} else if (udc->req_pending) {
1362				/*
1363				 * AT91 hardware has a hard time with this
1364				 * "deferred response" mode for control-OUT
1365				 * transfers.  (For control-IN it's fine.)
1366				 *
1367				 * The normal solution leaves OUT data in the
1368				 * fifo until the gadget driver is ready.
1369				 * We couldn't do that here without disabling
1370				 * the IRQ that tells about SETUP packets,
1371				 * e.g. when the host gets impatient...
1372				 *
1373				 * Working around it by copying into a buffer
1374				 * would almost be a non-deferred response,
1375				 * except that it wouldn't permit reliable
1376				 * stalling of the request.  Instead, demand
1377				 * that gadget drivers not use this mode.
1378				 */
1379				DBG("no control-OUT deferred responses!\n");
1380				__raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1381				udc->req_pending = 0;
1382			}
1383
1384		/* STATUS stage for control-IN; ack.  */
1385		} else {
1386			PACKET("ep0 out/status ACK\n");
1387			__raw_writel(csr, creg);
1388
1389			/* "early" status stage */
1390			if (req)
1391				done(ep0, req, 0);
1392		}
1393	}
1394}
1395
1396static irqreturn_t at91_udc_irq (int irq, void *_udc)
1397{
1398	struct at91_udc		*udc = _udc;
1399	u32			rescans = 5;
1400	int			disable_clock = 0;
1401	unsigned long		flags;
1402
1403	spin_lock_irqsave(&udc->lock, flags);
1404
1405	if (!udc->clocked) {
1406		clk_on(udc);
1407		disable_clock = 1;
1408	}
1409
1410	while (rescans--) {
1411		u32 status;
1412
1413		status = at91_udp_read(udc, AT91_UDP_ISR)
1414			& at91_udp_read(udc, AT91_UDP_IMR);
1415		if (!status)
1416			break;
1417
1418		/* USB reset irq:  not maskable */
1419		if (status & AT91_UDP_ENDBUSRES) {
1420			at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1421			at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1422			/* Atmel code clears this irq twice */
1423			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1424			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1425			VDBG("end bus reset\n");
1426			udc->addr = 0;
1427			reset_gadget(udc);
1428
1429			/* enable ep0 */
1430			at91_udp_write(udc, AT91_UDP_CSR(0),
1431					AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1432			udc->gadget.speed = USB_SPEED_FULL;
1433			udc->suspended = 0;
1434			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1435
1436			/*
1437			 * NOTE:  this driver keeps clocks off unless the
1438			 * USB host is present.  That saves power, but for
1439			 * boards that don't support VBUS detection, both
1440			 * clocks need to be active most of the time.
1441			 */
1442
1443		/* host initiated suspend (3+ms bus idle) */
1444		} else if (status & AT91_UDP_RXSUSP) {
1445			at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1446			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1447			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1448			/* VDBG("bus suspend\n"); */
1449			if (udc->suspended)
1450				continue;
1451			udc->suspended = 1;
1452
1453			/*
1454			 * NOTE:  when suspending a VBUS-powered device, the
1455			 * gadget driver should switch into slow clock mode
1456			 * and then into standby to avoid drawing more than
1457			 * 500uA power (2500uA for some high-power configs).
1458			 */
1459			if (udc->driver && udc->driver->suspend) {
1460				spin_unlock(&udc->lock);
1461				udc->driver->suspend(&udc->gadget);
1462				spin_lock(&udc->lock);
1463			}
1464
1465		/* host initiated resume */
1466		} else if (status & AT91_UDP_RXRSM) {
1467			at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1468			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1469			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1470			/* VDBG("bus resume\n"); */
1471			if (!udc->suspended)
1472				continue;
1473			udc->suspended = 0;
1474
1475			/*
1476			 * NOTE:  for a VBUS-powered device, the gadget driver
1477			 * would normally want to switch out of slow clock
1478			 * mode into normal mode.
1479			 */
1480			if (udc->driver && udc->driver->resume) {
1481				spin_unlock(&udc->lock);
1482				udc->driver->resume(&udc->gadget);
1483				spin_lock(&udc->lock);
1484			}
1485
1486		/* endpoint IRQs are cleared by handling them */
1487		} else {
1488			int		i;
1489			unsigned	mask = 1;
1490			struct at91_ep	*ep = &udc->ep[1];
1491
1492			if (status & mask)
1493				handle_ep0(udc);
1494			for (i = 1; i < NUM_ENDPOINTS; i++) {
1495				mask <<= 1;
1496				if (status & mask)
1497					handle_ep(ep);
1498				ep++;
1499			}
1500		}
1501	}
1502
1503	if (disable_clock)
1504		clk_off(udc);
1505
1506	spin_unlock_irqrestore(&udc->lock, flags);
1507
1508	return IRQ_HANDLED;
1509}
1510
1511/*-------------------------------------------------------------------------*/
1512
1513static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1514{
1515	if (value != udc->vbus)
1516		at91_vbus_session(&udc->gadget, value);
1517}
1518
1519static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1520{
1521	struct at91_udc	*udc = _udc;
1522
1523	/* vbus needs at least brief debouncing */
1524	udelay(10);
1525	at91_vbus_update(udc, gpiod_get_value(udc->board.vbus_pin));
1526
1527	return IRQ_HANDLED;
1528}
1529
1530static void at91_vbus_timer_work(struct work_struct *work)
1531{
1532	struct at91_udc *udc = container_of(work, struct at91_udc,
1533					    vbus_timer_work);
1534
1535	at91_vbus_update(udc, gpiod_get_value_cansleep(udc->board.vbus_pin));
1536
1537	if (!timer_pending(&udc->vbus_timer))
1538		mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1539}
1540
1541static void at91_vbus_timer(struct timer_list *t)
1542{
1543	struct at91_udc *udc = from_timer(udc, t, vbus_timer);
1544
1545	/*
1546	 * If we are polling vbus it is likely that the gpio is on an
1547	 * bus such as i2c or spi which may sleep, so schedule some work
1548	 * to read the vbus gpio
1549	 */
1550	schedule_work(&udc->vbus_timer_work);
1551}
1552
1553static int at91_start(struct usb_gadget *gadget,
1554		struct usb_gadget_driver *driver)
1555{
1556	struct at91_udc	*udc;
1557
1558	udc = container_of(gadget, struct at91_udc, gadget);
1559	udc->driver = driver;
1560	udc->gadget.dev.of_node = udc->pdev->dev.of_node;
1561	udc->enabled = 1;
1562	udc->gadget.is_selfpowered = 1;
1563
1564	return 0;
1565}
1566
1567static int at91_stop(struct usb_gadget *gadget)
1568{
1569	struct at91_udc *udc;
1570	unsigned long	flags;
1571
1572	udc = container_of(gadget, struct at91_udc, gadget);
1573	spin_lock_irqsave(&udc->lock, flags);
1574	udc->enabled = 0;
1575	at91_udp_write(udc, AT91_UDP_IDR, ~0);
1576	spin_unlock_irqrestore(&udc->lock, flags);
1577
1578	udc->driver = NULL;
1579
1580	return 0;
1581}
1582
1583/*-------------------------------------------------------------------------*/
1584
1585static void at91udc_shutdown(struct platform_device *dev)
1586{
1587	struct at91_udc *udc = platform_get_drvdata(dev);
1588	unsigned long	flags;
1589
1590	/* force disconnect on reboot */
1591	spin_lock_irqsave(&udc->lock, flags);
1592	pullup(platform_get_drvdata(dev), 0);
1593	spin_unlock_irqrestore(&udc->lock, flags);
1594}
1595
1596static int at91rm9200_udc_init(struct at91_udc *udc)
1597{
1598	struct at91_ep *ep;
1599	int i;
1600
1601	for (i = 0; i < NUM_ENDPOINTS; i++) {
1602		ep = &udc->ep[i];
1603
1604		switch (i) {
1605		case 0:
1606		case 3:
1607			ep->maxpacket = 8;
1608			break;
1609		case 1 ... 2:
1610			ep->maxpacket = 64;
1611			break;
1612		case 4 ... 5:
1613			ep->maxpacket = 256;
1614			break;
1615		}
1616	}
1617
1618	if (!udc->board.pullup_pin) {
1619		DBG("no D+ pullup?\n");
1620		return -ENODEV;
1621	}
1622
1623	gpiod_direction_output(udc->board.pullup_pin,
1624			       gpiod_is_active_low(udc->board.pullup_pin));
1625
1626	return 0;
1627}
1628
1629static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
1630{
1631	gpiod_set_value(udc->board.pullup_pin, is_on);
1632}
1633
1634static const struct at91_udc_caps at91rm9200_udc_caps = {
1635	.init = at91rm9200_udc_init,
1636	.pullup = at91rm9200_udc_pullup,
1637};
1638
1639static int at91sam9260_udc_init(struct at91_udc *udc)
1640{
1641	struct at91_ep *ep;
1642	int i;
1643
1644	for (i = 0; i < NUM_ENDPOINTS; i++) {
1645		ep = &udc->ep[i];
1646
1647		switch (i) {
1648		case 0 ... 3:
1649			ep->maxpacket = 64;
1650			break;
1651		case 4 ... 5:
1652			ep->maxpacket = 512;
1653			break;
1654		}
1655	}
1656
1657	return 0;
1658}
1659
1660static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
1661{
1662	u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
1663
1664	if (is_on)
1665		txvc |= AT91_UDP_TXVC_PUON;
1666	else
1667		txvc &= ~AT91_UDP_TXVC_PUON;
1668
1669	at91_udp_write(udc, AT91_UDP_TXVC, txvc);
1670}
1671
1672static const struct at91_udc_caps at91sam9260_udc_caps = {
1673	.init = at91sam9260_udc_init,
1674	.pullup = at91sam9260_udc_pullup,
1675};
1676
1677static int at91sam9261_udc_init(struct at91_udc *udc)
1678{
1679	struct at91_ep *ep;
1680	int i;
1681
1682	for (i = 0; i < NUM_ENDPOINTS; i++) {
1683		ep = &udc->ep[i];
1684
1685		switch (i) {
1686		case 0:
1687			ep->maxpacket = 8;
1688			break;
1689		case 1 ... 3:
1690			ep->maxpacket = 64;
1691			break;
1692		case 4 ... 5:
1693			ep->maxpacket = 256;
1694			break;
1695		}
1696	}
1697
1698	udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node,
1699						      "atmel,matrix");
1700	return PTR_ERR_OR_ZERO(udc->matrix);
1701}
1702
1703static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
1704{
1705	u32 usbpucr = 0;
1706
1707	if (is_on)
1708		usbpucr = AT91_MATRIX_USBPUCR_PUON;
1709
1710	regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
1711			   AT91_MATRIX_USBPUCR_PUON, usbpucr);
1712}
1713
1714static const struct at91_udc_caps at91sam9261_udc_caps = {
1715	.init = at91sam9261_udc_init,
1716	.pullup = at91sam9261_udc_pullup,
1717};
1718
1719static int at91sam9263_udc_init(struct at91_udc *udc)
1720{
1721	struct at91_ep *ep;
1722	int i;
1723
1724	for (i = 0; i < NUM_ENDPOINTS; i++) {
1725		ep = &udc->ep[i];
1726
1727		switch (i) {
1728		case 0:
1729		case 1:
1730		case 2:
1731		case 3:
1732			ep->maxpacket = 64;
1733			break;
1734		case 4:
1735		case 5:
1736			ep->maxpacket = 256;
1737			break;
1738		}
1739	}
1740
1741	return 0;
1742}
1743
1744static const struct at91_udc_caps at91sam9263_udc_caps = {
1745	.init = at91sam9263_udc_init,
1746	.pullup = at91sam9260_udc_pullup,
1747};
1748
1749static const struct of_device_id at91_udc_dt_ids[] = {
1750	{
1751		.compatible = "atmel,at91rm9200-udc",
1752		.data = &at91rm9200_udc_caps,
1753	},
1754	{
1755		.compatible = "atmel,at91sam9260-udc",
1756		.data = &at91sam9260_udc_caps,
1757	},
1758	{
1759		.compatible = "atmel,at91sam9261-udc",
1760		.data = &at91sam9261_udc_caps,
1761	},
1762	{
1763		.compatible = "atmel,at91sam9263-udc",
1764		.data = &at91sam9263_udc_caps,
1765	},
1766	{ /* sentinel */ }
1767};
1768MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
1769
1770static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
1771{
1772	struct at91_udc_data *board = &udc->board;
1773	const struct of_device_id *match;
1774	u32 val;
1775
1776	if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
1777		board->vbus_polled = 1;
1778
1779	board->vbus_pin = fwnode_gpiod_get_index(of_fwnode_handle(np),
1780						 "atmel,vbus", 0, GPIOD_IN,
1781						 "udc_vbus");
1782	if (IS_ERR(board->vbus_pin))
1783		board->vbus_pin = NULL;
1784
1785	board->pullup_pin = fwnode_gpiod_get_index(of_fwnode_handle(np),
1786						   "atmel,pullup", 0,
1787						   GPIOD_ASIS, "udc_pullup");
1788	if (IS_ERR(board->pullup_pin))
1789		board->pullup_pin = NULL;
1790
1791	match = of_match_node(at91_udc_dt_ids, np);
1792	if (match)
1793		udc->caps = match->data;
1794}
1795
1796static int at91udc_probe(struct platform_device *pdev)
1797{
1798	struct device	*dev = &pdev->dev;
1799	struct at91_udc	*udc;
1800	int		retval;
1801	struct at91_ep	*ep;
1802	int		i;
1803
1804	udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
1805	if (!udc)
1806		return -ENOMEM;
1807
1808	/* init software state */
1809	udc->gadget.dev.parent = dev;
1810	at91udc_of_init(udc, pdev->dev.of_node);
1811	udc->pdev = pdev;
1812	udc->enabled = 0;
1813	spin_lock_init(&udc->lock);
1814
1815	udc->gadget.ops = &at91_udc_ops;
1816	udc->gadget.ep0 = &udc->ep[0].ep;
1817	udc->gadget.name = driver_name;
1818	udc->gadget.dev.init_name = "gadget";
1819
1820	for (i = 0; i < NUM_ENDPOINTS; i++) {
1821		ep = &udc->ep[i];
1822		ep->ep.name = ep_info[i].name;
1823		ep->ep.caps = ep_info[i].caps;
1824		ep->ep.ops = &at91_ep_ops;
1825		ep->udc = udc;
1826		ep->int_mask = BIT(i);
1827		if (i != 0 && i != 3)
1828			ep->is_pingpong = 1;
1829	}
1830
1831	udc->udp_baseaddr = devm_platform_ioremap_resource(pdev, 0);
1832	if (IS_ERR(udc->udp_baseaddr))
1833		return PTR_ERR(udc->udp_baseaddr);
1834
1835	if (udc->caps && udc->caps->init) {
1836		retval = udc->caps->init(udc);
1837		if (retval)
1838			return retval;
1839	}
1840
1841	udc_reinit(udc);
1842
1843	/* get interface and function clocks */
1844	udc->iclk = devm_clk_get(dev, "pclk");
1845	if (IS_ERR(udc->iclk))
1846		return PTR_ERR(udc->iclk);
1847
1848	udc->fclk = devm_clk_get(dev, "hclk");
1849	if (IS_ERR(udc->fclk))
1850		return PTR_ERR(udc->fclk);
1851
1852	/* don't do anything until we have both gadget driver and VBUS */
1853	clk_set_rate(udc->fclk, 48000000);
1854	retval = clk_prepare(udc->fclk);
1855	if (retval)
1856		return retval;
1857
1858	retval = clk_prepare_enable(udc->iclk);
1859	if (retval)
1860		goto err_unprepare_fclk;
1861
1862	at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1863	at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1864	/* Clear all pending interrupts - UDP may be used by bootloader. */
1865	at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1866	clk_disable(udc->iclk);
1867
1868	/* request UDC and maybe VBUS irqs */
1869	udc->udp_irq = retval = platform_get_irq(pdev, 0);
1870	if (retval < 0)
1871		goto err_unprepare_iclk;
1872	retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
1873				  driver_name, udc);
1874	if (retval) {
1875		DBG("request irq %d failed\n", udc->udp_irq);
1876		goto err_unprepare_iclk;
1877	}
1878
1879	if (udc->board.vbus_pin) {
1880		gpiod_direction_input(udc->board.vbus_pin);
1881
1882		/*
1883		 * Get the initial state of VBUS - we cannot expect
1884		 * a pending interrupt.
1885		 */
1886		udc->vbus = gpiod_get_value_cansleep(udc->board.vbus_pin);
1887
1888		if (udc->board.vbus_polled) {
1889			INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1890			timer_setup(&udc->vbus_timer, at91_vbus_timer, 0);
1891			mod_timer(&udc->vbus_timer,
1892				  jiffies + VBUS_POLL_TIMEOUT);
1893		} else {
1894			retval = devm_request_irq(dev,
1895					gpiod_to_irq(udc->board.vbus_pin),
1896					at91_vbus_irq, 0, driver_name, udc);
1897			if (retval) {
1898				DBG("request vbus irq %d failed\n",
1899				    desc_to_gpio(udc->board.vbus_pin));
1900				goto err_unprepare_iclk;
1901			}
1902		}
1903	} else {
1904		DBG("no VBUS detection, assuming always-on\n");
1905		udc->vbus = 1;
1906	}
1907	retval = usb_add_gadget_udc(dev, &udc->gadget);
1908	if (retval)
1909		goto err_unprepare_iclk;
1910	dev_set_drvdata(dev, udc);
1911	device_init_wakeup(dev, 1);
1912	create_debug_file(udc);
1913
1914	INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1915	return 0;
1916
1917err_unprepare_iclk:
1918	clk_unprepare(udc->iclk);
1919err_unprepare_fclk:
1920	clk_unprepare(udc->fclk);
1921
1922	DBG("%s probe failed, %d\n", driver_name, retval);
1923
1924	return retval;
1925}
1926
1927static void at91udc_remove(struct platform_device *pdev)
1928{
1929	struct at91_udc *udc = platform_get_drvdata(pdev);
1930	unsigned long	flags;
1931
1932	DBG("remove\n");
1933
1934	usb_del_gadget_udc(&udc->gadget);
1935	if (udc->driver) {
1936		dev_err(&pdev->dev,
1937			"Driver still in use but removing anyhow\n");
1938		return;
1939	}
1940
1941	spin_lock_irqsave(&udc->lock, flags);
1942	pullup(udc, 0);
1943	spin_unlock_irqrestore(&udc->lock, flags);
1944
1945	device_init_wakeup(&pdev->dev, 0);
1946	remove_debug_file(udc);
1947	clk_unprepare(udc->fclk);
1948	clk_unprepare(udc->iclk);
 
 
1949}
1950
1951#ifdef CONFIG_PM
1952static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1953{
1954	struct at91_udc *udc = platform_get_drvdata(pdev);
1955	int		wake = udc->driver && device_may_wakeup(&pdev->dev);
1956	unsigned long	flags;
1957
1958	/* Unless we can act normally to the host (letting it wake us up
1959	 * whenever it has work for us) force disconnect.  Wakeup requires
1960	 * PLLB for USB events (signaling for reset, wakeup, or incoming
1961	 * tokens) and VBUS irqs (on systems which support them).
1962	 */
1963	if ((!udc->suspended && udc->addr)
1964			|| !wake
1965			|| at91_suspend_entering_slow_clock()) {
1966		spin_lock_irqsave(&udc->lock, flags);
1967		pullup(udc, 0);
1968		wake = 0;
1969		spin_unlock_irqrestore(&udc->lock, flags);
1970	} else
1971		enable_irq_wake(udc->udp_irq);
1972
1973	udc->active_suspend = wake;
1974	if (udc->board.vbus_pin && !udc->board.vbus_polled && wake)
1975		enable_irq_wake(gpiod_to_irq(udc->board.vbus_pin));
1976	return 0;
1977}
1978
1979static int at91udc_resume(struct platform_device *pdev)
1980{
1981	struct at91_udc *udc = platform_get_drvdata(pdev);
1982	unsigned long	flags;
1983
1984	if (udc->board.vbus_pin && !udc->board.vbus_polled &&
1985	    udc->active_suspend)
1986		disable_irq_wake(gpiod_to_irq(udc->board.vbus_pin));
1987
1988	/* maybe reconnect to host; if so, clocks on */
1989	if (udc->active_suspend)
1990		disable_irq_wake(udc->udp_irq);
1991	else {
1992		spin_lock_irqsave(&udc->lock, flags);
1993		pullup(udc, 1);
1994		spin_unlock_irqrestore(&udc->lock, flags);
1995	}
1996	return 0;
1997}
1998#else
1999#define	at91udc_suspend	NULL
2000#define	at91udc_resume	NULL
2001#endif
2002
2003static struct platform_driver at91_udc_driver = {
2004	.probe		= at91udc_probe,
2005	.remove_new	= at91udc_remove,
2006	.shutdown	= at91udc_shutdown,
2007	.suspend	= at91udc_suspend,
2008	.resume		= at91udc_resume,
2009	.driver		= {
2010		.name	= driver_name,
2011		.of_match_table	= at91_udc_dt_ids,
2012	},
2013};
2014
2015module_platform_driver(at91_udc_driver);
2016
2017MODULE_DESCRIPTION("AT91 udc driver");
2018MODULE_AUTHOR("Thomas Rathbone, David Brownell");
2019MODULE_LICENSE("GPL");
2020MODULE_ALIAS("platform:at91_udc");