musb_gadget.c 55.9 KB
Newer Older
F
Felipe Balbi 已提交
1 2 3 4 5 6
/*
 * MUSB OTG driver peripheral support
 *
 * Copyright 2005 Mentor Graphics Corporation
 * Copyright (C) 2005-2006 by Texas Instruments
 * Copyright (C) 2006-2007 Nokia Corporation
7
 * Copyright (C) 2009 MontaVista Software, Inc. <source@mvista.com>
F
Felipe Balbi 已提交
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/stat.h>
#include <linux/dma-mapping.h>
46
#include <linux/slab.h>
F
Felipe Balbi 已提交
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94

#include "musb_core.h"


/* MUSB PERIPHERAL status 3-mar-2006:
 *
 * - EP0 seems solid.  It passes both USBCV and usbtest control cases.
 *   Minor glitches:
 *
 *     + remote wakeup to Linux hosts work, but saw USBCV failures;
 *       in one test run (operator error?)
 *     + endpoint halt tests -- in both usbtest and usbcv -- seem
 *       to break when dma is enabled ... is something wrongly
 *       clearing SENDSTALL?
 *
 * - Mass storage behaved ok when last tested.  Network traffic patterns
 *   (with lots of short transfers etc) need retesting; they turn up the
 *   worst cases of the DMA, since short packets are typical but are not
 *   required.
 *
 * - TX/IN
 *     + both pio and dma behave in with network and g_zero tests
 *     + no cppi throughput issues other than no-hw-queueing
 *     + failed with FLAT_REG (DaVinci)
 *     + seems to behave with double buffering, PIO -and- CPPI
 *     + with gadgetfs + AIO, requests got lost?
 *
 * - RX/OUT
 *     + both pio and dma behave in with network and g_zero tests
 *     + dma is slow in typical case (short_not_ok is clear)
 *     + double buffering ok with PIO
 *     + double buffering *FAILS* with CPPI, wrong data bytes sometimes
 *     + request lossage observed with gadgetfs
 *
 * - ISO not tested ... might work, but only weakly isochronous
 *
 * - Gadget driver disabling of softconnect during bind() is ignored; so
 *   drivers can't hold off host requests until userspace is ready.
 *   (Workaround:  they can turn it off later.)
 *
 * - PORTABILITY (assumes PIO works):
 *     + DaVinci, basically works with cppi dma
 *     + OMAP 2430, ditto with mentor dma
 *     + TUSB 6010, platform-specific dma in the works
 */

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

95 96 97
#define is_buffer_mapped(req) (is_dma_capable() && \
					(req->map_state != UN_MAPPED))

98 99 100
/* Maps the buffer to dma  */

static inline void map_dma_buffer(struct musb_request *request,
101
			struct musb *musb, struct musb_ep *musb_ep)
102
{
103 104 105
	int compatible = true;
	struct dma_controller *dma = musb->dma_controller;

106 107 108 109 110
	request->map_state = UN_MAPPED;

	if (!is_dma_capable() || !musb_ep->dma)
		return;

111 112 113 114 115 116 117 118 119 120 121
	/* Check if DMA engine can handle this request.
	 * DMA code must reject the USB request explicitly.
	 * Default behaviour is to map the request.
	 */
	if (dma->is_compatible)
		compatible = dma->is_compatible(musb_ep->dma,
				musb_ep->packet_sz, request->request.buf,
				request->request.length);
	if (!compatible)
		return;

122 123 124 125 126 127 128 129
	if (request->request.dma == DMA_ADDR_INVALID) {
		request->request.dma = dma_map_single(
				musb->controller,
				request->request.buf,
				request->request.length,
				request->tx
					? DMA_TO_DEVICE
					: DMA_FROM_DEVICE);
130
		request->map_state = MUSB_MAPPED;
131 132 133 134 135 136 137
	} else {
		dma_sync_single_for_device(musb->controller,
			request->request.dma,
			request->request.length,
			request->tx
				? DMA_TO_DEVICE
				: DMA_FROM_DEVICE);
138
		request->map_state = PRE_MAPPED;
139 140 141 142 143 144 145
	}
}

/* Unmap the buffer from dma and maps it back to cpu */
static inline void unmap_dma_buffer(struct musb_request *request,
				struct musb *musb)
{
146 147 148
	if (!is_buffer_mapped(request))
		return;

149 150 151 152
	if (request->request.dma == DMA_ADDR_INVALID) {
		DBG(20, "not unmapping a never mapped buffer\n");
		return;
	}
153
	if (request->map_state == MUSB_MAPPED) {
154 155 156 157 158 159 160
		dma_unmap_single(musb->controller,
			request->request.dma,
			request->request.length,
			request->tx
				? DMA_TO_DEVICE
				: DMA_FROM_DEVICE);
		request->request.dma = DMA_ADDR_INVALID;
161
	} else { /* PRE_MAPPED */
162 163 164 165 166 167 168
		dma_sync_single_for_cpu(musb->controller,
			request->request.dma,
			request->request.length,
			request->tx
				? DMA_TO_DEVICE
				: DMA_FROM_DEVICE);
	}
169
	request->map_state = UN_MAPPED;
170 171
}

F
Felipe Balbi 已提交
172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
/*
 * Immediately complete a request.
 *
 * @param request the request to complete
 * @param status the status to complete the request with
 * Context: controller locked, IRQs blocked.
 */
void musb_g_giveback(
	struct musb_ep		*ep,
	struct usb_request	*request,
	int			status)
__releases(ep->musb->lock)
__acquires(ep->musb->lock)
{
	struct musb_request	*req;
	struct musb		*musb;
	int			busy = ep->busy;

	req = to_musb_request(request);

192
	list_del(&req->list);
F
Felipe Balbi 已提交
193 194 195 196 197 198
	if (req->request.status == -EINPROGRESS)
		req->request.status = status;
	musb = req->musb;

	ep->busy = 1;
	spin_unlock(&musb->lock);
199
	unmap_dma_buffer(req, musb);
F
Felipe Balbi 已提交
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229
	if (request->status == 0)
		DBG(5, "%s done request %p,  %d/%d\n",
				ep->end_point.name, request,
				req->request.actual, req->request.length);
	else
		DBG(2, "%s request %p, %d/%d fault %d\n",
				ep->end_point.name, request,
				req->request.actual, req->request.length,
				request->status);
	req->request.complete(&req->ep->end_point, &req->request);
	spin_lock(&musb->lock);
	ep->busy = busy;
}

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

/*
 * Abort requests queued to an endpoint using the status. Synchronous.
 * caller locked controller and blocked irqs, and selected this ep.
 */
static void nuke(struct musb_ep *ep, const int status)
{
	struct musb_request	*req = NULL;
	void __iomem *epio = ep->musb->endpoints[ep->current_epnum].regs;

	ep->busy = 1;

	if (is_dma_capable() && ep->dma) {
		struct dma_controller	*c = ep->musb->dma_controller;
		int value;
230

F
Felipe Balbi 已提交
231
		if (ep->is_in) {
232 233 234 235 236
			/*
			 * The programming guide says that we must not clear
			 * the DMAMODE bit before DMAENAB, so we only
			 * clear it in the second write...
			 */
F
Felipe Balbi 已提交
237
			musb_writew(epio, MUSB_TXCSR,
238
				    MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO);
F
Felipe Balbi 已提交
239 240 241 242 243 244 245 246 247 248 249 250 251 252 253
			musb_writew(epio, MUSB_TXCSR,
					0 | MUSB_TXCSR_FLUSHFIFO);
		} else {
			musb_writew(epio, MUSB_RXCSR,
					0 | MUSB_RXCSR_FLUSHFIFO);
			musb_writew(epio, MUSB_RXCSR,
					0 | MUSB_RXCSR_FLUSHFIFO);
		}

		value = c->channel_abort(ep->dma);
		DBG(value ? 1 : 6, "%s: abort DMA --> %d\n", ep->name, value);
		c->channel_release(ep->dma);
		ep->dma = NULL;
	}

254 255
	while (!list_empty(&ep->req_list)) {
		req = list_first_entry(&ep->req_list, struct musb_request, list);
F
Felipe Balbi 已提交
256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299
		musb_g_giveback(ep, &req->request, status);
	}
}

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

/* Data transfers - pure PIO, pure DMA, or mixed mode */

/*
 * This assumes the separate CPPI engine is responding to DMA requests
 * from the usb core ... sequenced a bit differently from mentor dma.
 */

static inline int max_ep_writesize(struct musb *musb, struct musb_ep *ep)
{
	if (can_bulk_split(musb, ep->type))
		return ep->hw_ep->max_packet_sz_tx;
	else
		return ep->packet_sz;
}


#ifdef CONFIG_USB_INVENTRA_DMA

/* Peripheral tx (IN) using Mentor DMA works as follows:
	Only mode 0 is used for transfers <= wPktSize,
	mode 1 is used for larger transfers,

	One of the following happens:
	- Host sends IN token which causes an endpoint interrupt
		-> TxAvail
			-> if DMA is currently busy, exit.
			-> if queue is non-empty, txstate().

	- Request is queued by the gadget driver.
		-> if queue was previously empty, txstate()

	txstate()
		-> start
		  /\	-> setup DMA
		  |     (data is transferred to the FIFO, then sent out when
		  |	IN token(s) are recd from Host.
		  |		-> DMA interrupt on completion
		  |		   calls TxAvail.
300
		  |		      -> stop DMA, ~DMAENAB,
F
Felipe Balbi 已提交
301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359
		  |		      -> set TxPktRdy for last short pkt or zlp
		  |		      -> Complete Request
		  |		      -> Continue next request (call txstate)
		  |___________________________________|

 * Non-Mentor DMA engines can of course work differently, such as by
 * upleveling from irq-per-packet to irq-per-buffer.
 */

#endif

/*
 * An endpoint is transmitting data. This can be called either from
 * the IRQ routine or from ep.queue() to kickstart a request on an
 * endpoint.
 *
 * Context: controller locked, IRQs blocked, endpoint selected
 */
static void txstate(struct musb *musb, struct musb_request *req)
{
	u8			epnum = req->epnum;
	struct musb_ep		*musb_ep;
	void __iomem		*epio = musb->endpoints[epnum].regs;
	struct usb_request	*request;
	u16			fifo_count = 0, csr;
	int			use_dma = 0;

	musb_ep = req->ep;

	/* we shouldn't get here while DMA is active ... but we do ... */
	if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
		DBG(4, "dma pending...\n");
		return;
	}

	/* read TXCSR before */
	csr = musb_readw(epio, MUSB_TXCSR);

	request = &req->request;
	fifo_count = min(max_ep_writesize(musb, musb_ep),
			(int)(request->length - request->actual));

	if (csr & MUSB_TXCSR_TXPKTRDY) {
		DBG(5, "%s old packet still ready , txcsr %03x\n",
				musb_ep->end_point.name, csr);
		return;
	}

	if (csr & MUSB_TXCSR_P_SENDSTALL) {
		DBG(5, "%s stalling, txcsr %03x\n",
				musb_ep->end_point.name, csr);
		return;
	}

	DBG(4, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x\n",
			epnum, musb_ep->packet_sz, fifo_count,
			csr);

#ifndef	CONFIG_MUSB_PIO_ONLY
360
	if (is_buffer_mapped(req)) {
F
Felipe Balbi 已提交
361
		struct dma_controller	*c = musb->dma_controller;
362 363 364 365 366
		size_t request_size;

		/* setup DMA, then program endpoint CSR */
		request_size = min_t(size_t, request->length - request->actual,
					musb_ep->dma->max_len);
F
Felipe Balbi 已提交
367 368 369 370 371 372 373

		use_dma = (request->dma != DMA_ADDR_INVALID);

		/* MUSB_TXCSR_P_ISO is still set correctly */

#ifdef CONFIG_USB_INVENTRA_DMA
		{
374
			if (request_size < musb_ep->packet_sz)
F
Felipe Balbi 已提交
375 376 377 378 379 380 381
				musb_ep->dma->desired_mode = 0;
			else
				musb_ep->dma->desired_mode = 1;

			use_dma = use_dma && c->channel_program(
					musb_ep->dma, musb_ep->packet_sz,
					musb_ep->dma->desired_mode,
C
Cliff Cai 已提交
382
					request->dma + request->actual, request_size);
F
Felipe Balbi 已提交
383 384
			if (use_dma) {
				if (musb_ep->dma->desired_mode == 0) {
385 386 387 388 389 390 391 392 393 394 395
					/*
					 * We must not clear the DMAMODE bit
					 * before the DMAENAB bit -- and the
					 * latter doesn't always get cleared
					 * before we get here...
					 */
					csr &= ~(MUSB_TXCSR_AUTOSET
						| MUSB_TXCSR_DMAENAB);
					musb_writew(epio, MUSB_TXCSR, csr
						| MUSB_TXCSR_P_WZC_BITS);
					csr &= ~MUSB_TXCSR_DMAMODE;
F
Felipe Balbi 已提交
396 397 398
					csr |= (MUSB_TXCSR_DMAENAB |
							MUSB_TXCSR_MODE);
					/* against programming guide */
399 400
				} else {
					csr |= (MUSB_TXCSR_DMAENAB
F
Felipe Balbi 已提交
401 402
							| MUSB_TXCSR_DMAMODE
							| MUSB_TXCSR_MODE);
403 404 405
					if (!musb_ep->hb_mult)
						csr |= MUSB_TXCSR_AUTOSET;
				}
F
Felipe Balbi 已提交
406
				csr &= ~MUSB_TXCSR_P_UNDERRUN;
407

F
Felipe Balbi 已提交
408 409 410 411 412 413
				musb_writew(epio, MUSB_TXCSR, csr);
			}
		}

#elif defined(CONFIG_USB_TI_CPPI_DMA)
		/* program endpoint CSR first, then setup DMA */
414
		csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
415 416
		csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE |
		       MUSB_TXCSR_MODE;
F
Felipe Balbi 已提交
417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436
		musb_writew(epio, MUSB_TXCSR,
			(MUSB_TXCSR_P_WZC_BITS & ~MUSB_TXCSR_P_UNDERRUN)
				| csr);

		/* ensure writebuffer is empty */
		csr = musb_readw(epio, MUSB_TXCSR);

		/* NOTE host side sets DMAENAB later than this; both are
		 * OK since the transfer dma glue (between CPPI and Mentor
		 * fifos) just tells CPPI it could start.  Data only moves
		 * to the USB TX fifo when both fifos are ready.
		 */

		/* "mode" is irrelevant here; handle terminating ZLPs like
		 * PIO does, since the hardware RNDIS mode seems unreliable
		 * except for the last-packet-is-already-short case.
		 */
		use_dma = use_dma && c->channel_program(
				musb_ep->dma, musb_ep->packet_sz,
				0,
437 438
				request->dma + request->actual,
				request_size);
F
Felipe Balbi 已提交
439 440 441
		if (!use_dma) {
			c->channel_release(musb_ep->dma);
			musb_ep->dma = NULL;
442 443
			csr &= ~MUSB_TXCSR_DMAENAB;
			musb_writew(epio, MUSB_TXCSR, csr);
F
Felipe Balbi 已提交
444 445 446 447 448 449
			/* invariant: prequest->buf is non-null */
		}
#elif defined(CONFIG_USB_TUSB_OMAP_DMA)
		use_dma = use_dma && c->channel_program(
				musb_ep->dma, musb_ep->packet_sz,
				request->zero,
450 451
				request->dma + request->actual,
				request_size);
F
Felipe Balbi 已提交
452 453 454 455 456
#endif
	}
#endif

	if (!use_dma) {
457 458 459 460
		/*
		 * Unmap the dma buffer back to cpu if dma channel
		 * programming fails
		 */
461
		unmap_dma_buffer(req, musb);
462

F
Felipe Balbi 已提交
463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486
		musb_write_fifo(musb_ep->hw_ep, fifo_count,
				(u8 *) (request->buf + request->actual));
		request->actual += fifo_count;
		csr |= MUSB_TXCSR_TXPKTRDY;
		csr &= ~MUSB_TXCSR_P_UNDERRUN;
		musb_writew(epio, MUSB_TXCSR, csr);
	}

	/* host may already have the data when this message shows... */
	DBG(3, "%s TX/IN %s len %d/%d, txcsr %04x, fifo %d/%d\n",
			musb_ep->end_point.name, use_dma ? "dma" : "pio",
			request->actual, request->length,
			musb_readw(epio, MUSB_TXCSR),
			fifo_count,
			musb_readw(epio, MUSB_TXMAXP));
}

/*
 * FIFO state update (e.g. data ready).
 * Called from IRQ,  with controller locked.
 */
void musb_g_tx(struct musb *musb, u8 epnum)
{
	u16			csr;
487
	struct musb_request	*req;
F
Felipe Balbi 已提交
488 489 490 491 492 493 494
	struct usb_request	*request;
	u8 __iomem		*mbase = musb->mregs;
	struct musb_ep		*musb_ep = &musb->endpoints[epnum].ep_in;
	void __iomem		*epio = musb->endpoints[epnum].regs;
	struct dma_channel	*dma;

	musb_ep_select(mbase, epnum);
495 496
	req = next_request(musb_ep);
	request = &req->request;
F
Felipe Balbi 已提交
497 498 499 500 501

	csr = musb_readw(epio, MUSB_TXCSR);
	DBG(4, "<== %s, txcsr %04x\n", musb_ep->end_point.name, csr);

	dma = is_dma_capable() ? musb_ep->dma : NULL;
502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525

	/*
	 * REVISIT: for high bandwidth, MUSB_TXCSR_P_INCOMPTX
	 * probably rates reporting as a host error.
	 */
	if (csr & MUSB_TXCSR_P_SENTSTALL) {
		csr |=	MUSB_TXCSR_P_WZC_BITS;
		csr &= ~MUSB_TXCSR_P_SENTSTALL;
		musb_writew(epio, MUSB_TXCSR, csr);
		return;
	}

	if (csr & MUSB_TXCSR_P_UNDERRUN) {
		/* We NAKed, no big deal... little reason to care. */
		csr |=	 MUSB_TXCSR_P_WZC_BITS;
		csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
		musb_writew(epio, MUSB_TXCSR, csr);
		DBG(20, "underrun on ep%d, req %p\n", epnum, request);
	}

	if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
		/*
		 * SHOULD NOT HAPPEN... has with CPPI though, after
		 * changing SENDSTALL (and other cases); harmless?
F
Felipe Balbi 已提交
526
		 */
527 528 529
		DBG(5, "%s dma still busy?\n", musb_ep->end_point.name);
		return;
	}
F
Felipe Balbi 已提交
530

531 532 533 534 535
	if (request) {
		u8	is_dma = 0;

		if (dma && (csr & MUSB_TXCSR_DMAENAB)) {
			is_dma = 1;
F
Felipe Balbi 已提交
536
			csr |= MUSB_TXCSR_P_WZC_BITS;
537
			csr &= ~(MUSB_TXCSR_DMAENAB | MUSB_TXCSR_P_UNDERRUN |
538
				 MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_AUTOSET);
F
Felipe Balbi 已提交
539
			musb_writew(epio, MUSB_TXCSR, csr);
540 541 542 543 544
			/* Ensure writebuffer is empty. */
			csr = musb_readw(epio, MUSB_TXCSR);
			request->actual += musb_ep->dma->actual_len;
			DBG(4, "TXCSR%d %04x, DMA off, len %zu, req %p\n",
				epnum, csr, musb_ep->dma->actual_len, request);
F
Felipe Balbi 已提交
545 546
		}

547 548 549 550 551 552 553
		/*
		 * First, maybe a terminating short packet. Some DMA
		 * engines might handle this by themselves.
		 */
		if ((request->zero && request->length
			&& (request->length % musb_ep->packet_sz == 0)
			&& (request->actual == request->length))
F
Felipe Balbi 已提交
554
#ifdef CONFIG_USB_INVENTRA_DMA
555 556 557
			|| (is_dma && (!dma->desired_mode ||
				(request->actual &
					(musb_ep->packet_sz - 1))))
F
Felipe Balbi 已提交
558
#endif
559 560 561 562 563 564 565
		) {
			/*
			 * On DMA completion, FIFO may not be
			 * available yet...
			 */
			if (csr & MUSB_TXCSR_TXPKTRDY)
				return;
F
Felipe Balbi 已提交
566

567 568 569 570 571 572 573 574
			DBG(4, "sending zero pkt\n");
			musb_writew(epio, MUSB_TXCSR, MUSB_TXCSR_MODE
					| MUSB_TXCSR_TXPKTRDY);
			request->zero = 0;
		}

		if (request->actual == request->length) {
			musb_g_giveback(musb_ep, request, 0);
575 576
			req = musb_ep->desc ? next_request(musb_ep) : NULL;
			if (!req) {
577 578 579
				DBG(4, "%s idle now\n",
					musb_ep->end_point.name);
				return;
580
			}
F
Felipe Balbi 已提交
581 582
		}

583
		txstate(musb, req);
584
	}
F
Felipe Balbi 已提交
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626
}

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

#ifdef CONFIG_USB_INVENTRA_DMA

/* Peripheral rx (OUT) using Mentor DMA works as follows:
	- Only mode 0 is used.

	- Request is queued by the gadget class driver.
		-> if queue was previously empty, rxstate()

	- Host sends OUT token which causes an endpoint interrupt
	  /\      -> RxReady
	  |	      -> if request queued, call rxstate
	  |		/\	-> setup DMA
	  |		|	     -> DMA interrupt on completion
	  |		|		-> RxReady
	  |		|		      -> stop DMA
	  |		|		      -> ack the read
	  |		|		      -> if data recd = max expected
	  |		|				by the request, or host
	  |		|				sent a short packet,
	  |		|				complete the request,
	  |		|				and start the next one.
	  |		|_____________________________________|
	  |					 else just wait for the host
	  |					    to send the next OUT token.
	  |__________________________________________________|

 * Non-Mentor DMA engines can of course work differently.
 */

#endif

/*
 * Context: controller locked, IRQs blocked, endpoint selected
 */
static void rxstate(struct musb *musb, struct musb_request *req)
{
	const u8		epnum = req->epnum;
	struct usb_request	*request = &req->request;
627
	struct musb_ep		*musb_ep;
F
Felipe Balbi 已提交
628
	void __iomem		*epio = musb->endpoints[epnum].regs;
629
	unsigned		fifo_count = 0;
630
	u16			len;
631
	u16			csr = musb_readw(epio, MUSB_RXCSR);
632 633 634 635 636 637 638 639
	struct musb_hw_ep	*hw_ep = &musb->endpoints[epnum];

	if (hw_ep->is_shared_fifo)
		musb_ep = &hw_ep->ep_in;
	else
		musb_ep = &hw_ep->ep_out;

	len = musb_ep->packet_sz;
F
Felipe Balbi 已提交
640

641 642 643 644 645 646 647 648 649 650 651
	/* We shouldn't get here while DMA is active, but we do... */
	if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
		DBG(4, "DMA pending...\n");
		return;
	}

	if (csr & MUSB_RXCSR_P_SENDSTALL) {
		DBG(5, "%s stalling, RXCSR %04x\n",
		    musb_ep->end_point.name, csr);
		return;
	}
F
Felipe Balbi 已提交
652

653
	if (is_cppi_enabled() && is_buffer_mapped(req)) {
F
Felipe Balbi 已提交
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
		struct dma_controller	*c = musb->dma_controller;
		struct dma_channel	*channel = musb_ep->dma;

		/* NOTE:  CPPI won't actually stop advancing the DMA
		 * queue after short packet transfers, so this is almost
		 * always going to run as IRQ-per-packet DMA so that
		 * faults will be handled correctly.
		 */
		if (c->channel_program(channel,
				musb_ep->packet_sz,
				!request->short_not_ok,
				request->dma + request->actual,
				request->length - request->actual)) {

			/* make sure that if an rxpkt arrived after the irq,
			 * the cppi engine will be ready to take it as soon
			 * as DMA is enabled
			 */
			csr &= ~(MUSB_RXCSR_AUTOCLEAR
					| MUSB_RXCSR_DMAMODE);
			csr |= MUSB_RXCSR_DMAENAB | MUSB_RXCSR_P_WZC_BITS;
			musb_writew(epio, MUSB_RXCSR, csr);
			return;
		}
	}

	if (csr & MUSB_RXCSR_RXPKTRDY) {
		len = musb_readw(epio, MUSB_RXCOUNT);
		if (request->actual < request->length) {
#ifdef CONFIG_USB_INVENTRA_DMA
684
			if (is_buffer_mapped(req)) {
F
Felipe Balbi 已提交
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
				struct dma_controller	*c;
				struct dma_channel	*channel;
				int			use_dma = 0;

				c = musb->dma_controller;
				channel = musb_ep->dma;

	/* We use DMA Req mode 0 in rx_csr, and DMA controller operates in
	 * mode 0 only. So we do not get endpoint interrupts due to DMA
	 * completion. We only get interrupts from DMA controller.
	 *
	 * We could operate in DMA mode 1 if we knew the size of the tranfer
	 * in advance. For mass storage class, request->length = what the host
	 * sends, so that'd work.  But for pretty much everything else,
	 * request->length is routinely more than what the host sends. For
	 * most these gadgets, end of is signified either by a short packet,
	 * or filling the last byte of the buffer.  (Sending extra data in
	 * that last pckate should trigger an overflow fault.)  But in mode 1,
	 * we don't get DMA completion interrrupt for short packets.
	 *
	 * Theoretically, we could enable DMAReq irq (MUSB_RXCSR_DMAMODE = 1),
	 * to get endpoint interrupt on every DMA req, but that didn't seem
	 * to work reliably.
	 *
	 * REVISIT an updated g_file_storage can set req->short_not_ok, which
	 * then becomes usable as a runtime "use mode 1" hint...
	 */

				csr |= MUSB_RXCSR_DMAENAB;
714
#ifdef USE_MODE1
715
				csr |= MUSB_RXCSR_AUTOCLEAR;
F
Felipe Balbi 已提交
716 717 718 719 720 721 722 723
				/* csr |= MUSB_RXCSR_DMAMODE; */

				/* this special sequence (enabling and then
				 * disabling MUSB_RXCSR_DMAMODE) is required
				 * to get DMAReq to activate
				 */
				musb_writew(epio, MUSB_RXCSR,
					csr | MUSB_RXCSR_DMAMODE);
724 725 726 727
#else
				if (!musb_ep->hb_mult &&
					musb_ep->hw_ep->rx_double_buffered)
					csr |= MUSB_RXCSR_AUTOCLEAR;
F
Felipe Balbi 已提交
728 729 730 731 732 733
#endif
				musb_writew(epio, MUSB_RXCSR, csr);

				if (request->actual < request->length) {
					int transfer_size = 0;
#ifdef USE_MODE1
734
					transfer_size = min(request->length - request->actual,
F
Felipe Balbi 已提交
735 736
							channel->max_len);
#else
737 738
					transfer_size = min(request->length - request->actual,
							(unsigned)len);
F
Felipe Balbi 已提交
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764
#endif
					if (transfer_size <= musb_ep->packet_sz)
						musb_ep->dma->desired_mode = 0;
					else
						musb_ep->dma->desired_mode = 1;

					use_dma = c->channel_program(
							channel,
							musb_ep->packet_sz,
							channel->desired_mode,
							request->dma
							+ request->actual,
							transfer_size);
				}

				if (use_dma)
					return;
			}
#endif	/* Mentor's DMA */

			fifo_count = request->length - request->actual;
			DBG(3, "%s OUT/RX pio fifo %d/%d, maxpacket %d\n",
					musb_ep->end_point.name,
					len, fifo_count,
					musb_ep->packet_sz);

765
			fifo_count = min_t(unsigned, len, fifo_count);
F
Felipe Balbi 已提交
766 767

#ifdef	CONFIG_USB_TUSB_OMAP_DMA
768
			if (tusb_dma_omap() && is_buffer_mapped(req)) {
F
Felipe Balbi 已提交
769 770 771 772 773 774 775 776 777 778 779 780 781 782
				struct dma_controller *c = musb->dma_controller;
				struct dma_channel *channel = musb_ep->dma;
				u32 dma_addr = request->dma + request->actual;
				int ret;

				ret = c->channel_program(channel,
						musb_ep->packet_sz,
						channel->desired_mode,
						dma_addr,
						fifo_count);
				if (ret)
					return;
			}
#endif
783 784 785 786 787
			/*
			 * Unmap the dma buffer back to cpu if dma channel
			 * programming fails. This buffer is mapped if the
			 * channel allocation is successful
			 */
788
			 if (is_buffer_mapped(req)) {
789 790
				unmap_dma_buffer(req, musb);

791 792
				/*
				 * Clear DMAENAB and AUTOCLEAR for the
793 794
				 * PIO mode transfer
				 */
795
				csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR);
796 797
				musb_writew(epio, MUSB_RXCSR, csr);
			}
F
Felipe Balbi 已提交
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824

			musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *)
					(request->buf + request->actual));
			request->actual += fifo_count;

			/* REVISIT if we left anything in the fifo, flush
			 * it and report -EOVERFLOW
			 */

			/* ack the read! */
			csr |= MUSB_RXCSR_P_WZC_BITS;
			csr &= ~MUSB_RXCSR_RXPKTRDY;
			musb_writew(epio, MUSB_RXCSR, csr);
		}
	}

	/* reach the end or short packet detected */
	if (request->actual == request->length || len < musb_ep->packet_sz)
		musb_g_giveback(musb_ep, request, 0);
}

/*
 * Data ready for a request; called from IRQ
 */
void musb_g_rx(struct musb *musb, u8 epnum)
{
	u16			csr;
825
	struct musb_request	*req;
F
Felipe Balbi 已提交
826 827
	struct usb_request	*request;
	void __iomem		*mbase = musb->mregs;
828
	struct musb_ep		*musb_ep;
F
Felipe Balbi 已提交
829 830
	void __iomem		*epio = musb->endpoints[epnum].regs;
	struct dma_channel	*dma;
831 832 833 834 835 836
	struct musb_hw_ep	*hw_ep = &musb->endpoints[epnum];

	if (hw_ep->is_shared_fifo)
		musb_ep = &hw_ep->ep_in;
	else
		musb_ep = &hw_ep->ep_out;
F
Felipe Balbi 已提交
837 838 839

	musb_ep_select(mbase, epnum);

840 841
	req = next_request(musb_ep);
	if (!req)
842
		return;
F
Felipe Balbi 已提交
843

844 845
	request = &req->request;

F
Felipe Balbi 已提交
846 847 848 849 850 851 852 853 854 855
	csr = musb_readw(epio, MUSB_RXCSR);
	dma = is_dma_capable() ? musb_ep->dma : NULL;

	DBG(4, "<== %s, rxcsr %04x%s %p\n", musb_ep->end_point.name,
			csr, dma ? " (dma)" : "", request);

	if (csr & MUSB_RXCSR_P_SENTSTALL) {
		csr |= MUSB_RXCSR_P_WZC_BITS;
		csr &= ~MUSB_RXCSR_P_SENTSTALL;
		musb_writew(epio, MUSB_RXCSR, csr);
856
		return;
F
Felipe Balbi 已提交
857 858 859 860 861 862 863 864
	}

	if (csr & MUSB_RXCSR_P_OVERRUN) {
		/* csr |= MUSB_RXCSR_P_WZC_BITS; */
		csr &= ~MUSB_RXCSR_P_OVERRUN;
		musb_writew(epio, MUSB_RXCSR, csr);

		DBG(3, "%s iso overrun on %p\n", musb_ep->name, request);
865
		if (request->status == -EINPROGRESS)
F
Felipe Balbi 已提交
866 867 868 869 870 871 872 873 874 875 876 877
			request->status = -EOVERFLOW;
	}
	if (csr & MUSB_RXCSR_INCOMPRX) {
		/* REVISIT not necessarily an error */
		DBG(4, "%s, incomprx\n", musb_ep->end_point.name);
	}

	if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
		/* "should not happen"; likely RXPKTRDY pending for DMA */
		DBG((csr & MUSB_RXCSR_DMAENAB) ? 4 : 1,
			"%s busy, csr %04x\n",
			musb_ep->end_point.name, csr);
878
		return;
F
Felipe Balbi 已提交
879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
	}

	if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
		csr &= ~(MUSB_RXCSR_AUTOCLEAR
				| MUSB_RXCSR_DMAENAB
				| MUSB_RXCSR_DMAMODE);
		musb_writew(epio, MUSB_RXCSR,
			MUSB_RXCSR_P_WZC_BITS | csr);

		request->actual += musb_ep->dma->actual_len;

		DBG(4, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n",
			epnum, csr,
			musb_readw(epio, MUSB_RXCSR),
			musb_ep->dma->actual_len, request);

#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA)
		/* Autoclear doesn't clear RxPktRdy for short packets */
897
		if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered)
F
Felipe Balbi 已提交
898 899 900 901 902 903 904 905 906 907
				|| (dma->actual_len
					& (musb_ep->packet_sz - 1))) {
			/* ack the read! */
			csr &= ~MUSB_RXCSR_RXPKTRDY;
			musb_writew(epio, MUSB_RXCSR, csr);
		}

		/* incomplete, and not short? wait for next IN packet */
		if ((request->actual < request->length)
				&& (musb_ep->dma->actual_len
908 909 910 911 912 913 914 915
					== musb_ep->packet_sz)) {
			/* In double buffer case, continue to unload fifo if
 			 * there is Rx packet in FIFO.
 			 **/
			csr = musb_readw(epio, MUSB_RXCSR);
			if ((csr & MUSB_RXCSR_RXPKTRDY) &&
				hw_ep->rx_double_buffered)
				goto exit;
916
			return;
917
		}
F
Felipe Balbi 已提交
918 919 920
#endif
		musb_g_giveback(musb_ep, request, 0);

921 922
		req = next_request(musb_ep);
		if (!req)
923
			return;
F
Felipe Balbi 已提交
924
	}
925
#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA)
926
exit:
927
#endif
928
	/* Analyze request */
929
	rxstate(musb, req);
F
Felipe Balbi 已提交
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
}

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

static int musb_gadget_enable(struct usb_ep *ep,
			const struct usb_endpoint_descriptor *desc)
{
	unsigned long		flags;
	struct musb_ep		*musb_ep;
	struct musb_hw_ep	*hw_ep;
	void __iomem		*regs;
	struct musb		*musb;
	void __iomem	*mbase;
	u8		epnum;
	u16		csr;
	unsigned	tmp;
	int		status = -EINVAL;

	if (!ep || !desc)
		return -EINVAL;

	musb_ep = to_musb_ep(ep);
	hw_ep = musb_ep->hw_ep;
	regs = hw_ep->regs;
	musb = musb_ep->musb;
	mbase = musb->mregs;
	epnum = musb_ep->current_epnum;

	spin_lock_irqsave(&musb->lock, flags);

	if (musb_ep->desc) {
		status = -EBUSY;
		goto fail;
	}
J
Julia Lawall 已提交
964
	musb_ep->type = usb_endpoint_type(desc);
F
Felipe Balbi 已提交
965 966

	/* check direction and (later) maxpacket size against endpoint */
J
Julia Lawall 已提交
967
	if (usb_endpoint_num(desc) != epnum)
F
Felipe Balbi 已提交
968 969 970 971
		goto fail;

	/* REVISIT this rules out high bandwidth periodic transfers */
	tmp = le16_to_cpu(desc->wMaxPacketSize);
972 973 974 975 976 977 978 979 980
	if (tmp & ~0x07ff) {
		int ok;

		if (usb_endpoint_dir_in(desc))
			ok = musb->hb_iso_tx;
		else
			ok = musb->hb_iso_rx;

		if (!ok) {
981
			DBG(4, "no support for high bandwidth ISO\n");
982 983 984 985 986 987 988 989 990
			goto fail;
		}
		musb_ep->hb_mult = (tmp >> 11) & 3;
	} else {
		musb_ep->hb_mult = 0;
	}

	musb_ep->packet_sz = tmp & 0x7ff;
	tmp = musb_ep->packet_sz * (musb_ep->hb_mult + 1);
F
Felipe Balbi 已提交
991 992 993 994 995

	/* enable the interrupts for the endpoint, set the endpoint
	 * packet size (or fail), set the mode, clear the fifo
	 */
	musb_ep_select(mbase, epnum);
J
Julia Lawall 已提交
996
	if (usb_endpoint_dir_in(desc)) {
F
Felipe Balbi 已提交
997 998 999 1000 1001 1002
		u16 int_txe = musb_readw(mbase, MUSB_INTRTXE);

		if (hw_ep->is_shared_fifo)
			musb_ep->is_in = 1;
		if (!musb_ep->is_in)
			goto fail;
1003 1004

		if (tmp > hw_ep->max_packet_sz_tx) {
1005
			DBG(4, "packet size beyond hardware FIFO size\n");
F
Felipe Balbi 已提交
1006
			goto fail;
1007
		}
F
Felipe Balbi 已提交
1008 1009 1010 1011 1012 1013 1014

		int_txe |= (1 << epnum);
		musb_writew(mbase, MUSB_INTRTXE, int_txe);

		/* REVISIT if can_bulk_split(), use by updating "tmp";
		 * likewise high bandwidth periodic tx
		 */
1015
		/* Set TXMAXP with the FIFO size of the endpoint
1016
		 * to disable double buffering mode.
1017
		 */
1018 1019 1020 1021 1022
		if (musb->double_buffer_not_ok)
			musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx);
		else
			musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz
					| (musb_ep->hb_mult << 11));
F
Felipe Balbi 已提交
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042

		csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG;
		if (musb_readw(regs, MUSB_TXCSR)
				& MUSB_TXCSR_FIFONOTEMPTY)
			csr |= MUSB_TXCSR_FLUSHFIFO;
		if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
			csr |= MUSB_TXCSR_P_ISO;

		/* set twice in case of double buffering */
		musb_writew(regs, MUSB_TXCSR, csr);
		/* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
		musb_writew(regs, MUSB_TXCSR, csr);

	} else {
		u16 int_rxe = musb_readw(mbase, MUSB_INTRRXE);

		if (hw_ep->is_shared_fifo)
			musb_ep->is_in = 0;
		if (musb_ep->is_in)
			goto fail;
1043 1044

		if (tmp > hw_ep->max_packet_sz_rx) {
1045
			DBG(4, "packet size beyond hardware FIFO size\n");
F
Felipe Balbi 已提交
1046
			goto fail;
1047
		}
F
Felipe Balbi 已提交
1048 1049 1050 1051 1052 1053 1054

		int_rxe |= (1 << epnum);
		musb_writew(mbase, MUSB_INTRRXE, int_rxe);

		/* REVISIT if can_bulk_combine() use by updating "tmp"
		 * likewise high bandwidth periodic rx
		 */
1055 1056 1057
		/* Set RXMAXP with the FIFO size of the endpoint
		 * to disable double buffering mode.
		 */
1058 1059 1060 1061 1062
		if (musb->double_buffer_not_ok)
			musb_writew(regs, MUSB_RXMAXP, hw_ep->max_packet_sz_tx);
		else
			musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz
					| (musb_ep->hb_mult << 11));
F
Felipe Balbi 已提交
1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094

		/* force shared fifo to OUT-only mode */
		if (hw_ep->is_shared_fifo) {
			csr = musb_readw(regs, MUSB_TXCSR);
			csr &= ~(MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY);
			musb_writew(regs, MUSB_TXCSR, csr);
		}

		csr = MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_CLRDATATOG;
		if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
			csr |= MUSB_RXCSR_P_ISO;
		else if (musb_ep->type == USB_ENDPOINT_XFER_INT)
			csr |= MUSB_RXCSR_DISNYET;

		/* set twice in case of double buffering */
		musb_writew(regs, MUSB_RXCSR, csr);
		musb_writew(regs, MUSB_RXCSR, csr);
	}

	/* NOTE:  all the I/O code _should_ work fine without DMA, in case
	 * for some reason you run out of channels here.
	 */
	if (is_dma_capable() && musb->dma_controller) {
		struct dma_controller	*c = musb->dma_controller;

		musb_ep->dma = c->channel_alloc(c, hw_ep,
				(desc->bEndpointAddress & USB_DIR_IN));
	} else
		musb_ep->dma = NULL;

	musb_ep->desc = desc;
	musb_ep->busy = 0;
1095
	musb_ep->wedged = 0;
F
Felipe Balbi 已提交
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
	status = 0;

	pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n",
			musb_driver_name, musb_ep->end_point.name,
			({ char *s; switch (musb_ep->type) {
			case USB_ENDPOINT_XFER_BULK:	s = "bulk"; break;
			case USB_ENDPOINT_XFER_INT:	s = "int"; break;
			default:			s = "iso"; break;
			}; s; }),
			musb_ep->is_in ? "IN" : "OUT",
			musb_ep->dma ? "dma, " : "",
			musb_ep->packet_sz);

	schedule_work(&musb->irq_work);

fail:
	spin_unlock_irqrestore(&musb->lock, flags);
	return status;
}

/*
 * Disable an endpoint flushing all requests queued.
 */
static int musb_gadget_disable(struct usb_ep *ep)
{
	unsigned long	flags;
	struct musb	*musb;
	u8		epnum;
	struct musb_ep	*musb_ep;
	void __iomem	*epio;
	int		status = 0;

	musb_ep = to_musb_ep(ep);
	musb = musb_ep->musb;
	epnum = musb_ep->current_epnum;
	epio = musb->endpoints[epnum].regs;

	spin_lock_irqsave(&musb->lock, flags);
	musb_ep_select(musb->mregs, epnum);

	/* zero the endpoint sizes */
	if (musb_ep->is_in) {
		u16 int_txe = musb_readw(musb->mregs, MUSB_INTRTXE);
		int_txe &= ~(1 << epnum);
		musb_writew(musb->mregs, MUSB_INTRTXE, int_txe);
		musb_writew(epio, MUSB_TXMAXP, 0);
	} else {
		u16 int_rxe = musb_readw(musb->mregs, MUSB_INTRRXE);
		int_rxe &= ~(1 << epnum);
		musb_writew(musb->mregs, MUSB_INTRRXE, int_rxe);
		musb_writew(epio, MUSB_RXMAXP, 0);
	}

	musb_ep->desc = NULL;

	/* abort all pending DMA and requests */
	nuke(musb_ep, -ESHUTDOWN);

	schedule_work(&musb->irq_work);

	spin_unlock_irqrestore(&(musb->lock), flags);

	DBG(2, "%s\n", musb_ep->end_point.name);

	return status;
}

/*
 * Allocate a request for an endpoint.
 * Reused by ep0 code.
 */
struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
{
	struct musb_ep		*musb_ep = to_musb_ep(ep);
	struct musb_request	*request = NULL;

	request = kzalloc(sizeof *request, gfp_flags);
1173 1174 1175
	if (!request) {
		DBG(4, "not enough memory\n");
		return NULL;
F
Felipe Balbi 已提交
1176 1177
	}

1178 1179 1180 1181
	request->request.dma = DMA_ADDR_INVALID;
	request->epnum = musb_ep->current_epnum;
	request->ep = musb_ep;

F
Felipe Balbi 已提交
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
	return &request->request;
}

/*
 * Free a request
 * Reused by ep0 code.
 */
void musb_free_request(struct usb_ep *ep, struct usb_request *req)
{
	kfree(to_musb_request(req));
}

static LIST_HEAD(buffers);

struct free_record {
	struct list_head	list;
	struct device		*dev;
	unsigned		bytes;
	dma_addr_t		dma;
};

/*
 * Context: controller locked, IRQs blocked.
 */
1206
void musb_ep_restart(struct musb *musb, struct musb_request *req)
F
Felipe Balbi 已提交
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
{
	DBG(3, "<== %s request %p len %u on hw_ep%d\n",
		req->tx ? "TX/IN" : "RX/OUT",
		&req->request, req->request.length, req->epnum);

	musb_ep_select(musb->mregs, req->epnum);
	if (req->tx)
		txstate(musb, req);
	else
		rxstate(musb, req);
}

static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req,
			gfp_t gfp_flags)
{
	struct musb_ep		*musb_ep;
	struct musb_request	*request;
	struct musb		*musb;
	int			status = 0;
	unsigned long		lockflags;

	if (!ep || !req)
		return -EINVAL;
	if (!req->buf)
		return -ENODATA;

	musb_ep = to_musb_ep(ep);
	musb = musb_ep->musb;

	request = to_musb_request(req);
	request->musb = musb;

	if (request->ep != musb_ep)
		return -EINVAL;

	DBG(4, "<== to %s request=%p\n", ep->name, req);

	/* request is mine now... */
	request->request.actual = 0;
	request->request.status = -EINPROGRESS;
	request->epnum = musb_ep->current_epnum;
	request->tx = musb_ep->is_in;

1250
	map_dma_buffer(request, musb, musb_ep);
F
Felipe Balbi 已提交
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262

	spin_lock_irqsave(&musb->lock, lockflags);

	/* don't queue if the ep is down */
	if (!musb_ep->desc) {
		DBG(4, "req %p queued to %s while ep %s\n",
				req, ep->name, "disabled");
		status = -ESHUTDOWN;
		goto cleanup;
	}

	/* add request to the list */
1263
	list_add_tail(&request->list, &musb_ep->req_list);
F
Felipe Balbi 已提交
1264 1265

	/* it this is the head of the queue, start i/o ... */
1266
	if (!musb_ep->busy && &request->list == musb_ep->req_list.next)
F
Felipe Balbi 已提交
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276
		musb_ep_restart(musb, request);

cleanup:
	spin_unlock_irqrestore(&musb->lock, lockflags);
	return status;
}

static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request)
{
	struct musb_ep		*musb_ep = to_musb_ep(ep);
1277 1278
	struct musb_request	*req = to_musb_request(request);
	struct musb_request	*r;
F
Felipe Balbi 已提交
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
	unsigned long		flags;
	int			status = 0;
	struct musb		*musb = musb_ep->musb;

	if (!ep || !request || to_musb_request(request)->ep != musb_ep)
		return -EINVAL;

	spin_lock_irqsave(&musb->lock, flags);

	list_for_each_entry(r, &musb_ep->req_list, list) {
1289
		if (r == req)
F
Felipe Balbi 已提交
1290 1291
			break;
	}
1292
	if (r != req) {
F
Felipe Balbi 已提交
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330
		DBG(3, "request %p not queued to %s\n", request, ep->name);
		status = -EINVAL;
		goto done;
	}

	/* if the hardware doesn't have the request, easy ... */
	if (musb_ep->req_list.next != &request->list || musb_ep->busy)
		musb_g_giveback(musb_ep, request, -ECONNRESET);

	/* ... else abort the dma transfer ... */
	else if (is_dma_capable() && musb_ep->dma) {
		struct dma_controller	*c = musb->dma_controller;

		musb_ep_select(musb->mregs, musb_ep->current_epnum);
		if (c->channel_abort)
			status = c->channel_abort(musb_ep->dma);
		else
			status = -EBUSY;
		if (status == 0)
			musb_g_giveback(musb_ep, request, -ECONNRESET);
	} else {
		/* NOTE: by sticking to easily tested hardware/driver states,
		 * we leave counting of in-flight packets imprecise.
		 */
		musb_g_giveback(musb_ep, request, -ECONNRESET);
	}

done:
	spin_unlock_irqrestore(&musb->lock, flags);
	return status;
}

/*
 * Set or clear the halt bit of an endpoint. A halted enpoint won't tx/rx any
 * data but will queue requests.
 *
 * exported to ep0 code
 */
1331
static int musb_gadget_set_halt(struct usb_ep *ep, int value)
F
Felipe Balbi 已提交
1332 1333 1334 1335 1336 1337 1338 1339
{
	struct musb_ep		*musb_ep = to_musb_ep(ep);
	u8			epnum = musb_ep->current_epnum;
	struct musb		*musb = musb_ep->musb;
	void __iomem		*epio = musb->endpoints[epnum].regs;
	void __iomem		*mbase;
	unsigned long		flags;
	u16			csr;
1340
	struct musb_request	*request;
F
Felipe Balbi 已提交
1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
	int			status = 0;

	if (!ep)
		return -EINVAL;
	mbase = musb->mregs;

	spin_lock_irqsave(&musb->lock, flags);

	if ((USB_ENDPOINT_XFER_ISOC == musb_ep->type)) {
		status = -EINVAL;
		goto done;
	}

	musb_ep_select(mbase, epnum);

1356
	request = next_request(musb_ep);
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371
	if (value) {
		if (request) {
			DBG(3, "request in progress, cannot halt %s\n",
			    ep->name);
			status = -EAGAIN;
			goto done;
		}
		/* Cannot portably stall with non-empty FIFO */
		if (musb_ep->is_in) {
			csr = musb_readw(epio, MUSB_TXCSR);
			if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
				DBG(3, "FIFO busy, cannot halt %s\n", ep->name);
				status = -EAGAIN;
				goto done;
			}
F
Felipe Balbi 已提交
1372
		}
1373 1374
	} else
		musb_ep->wedged = 0;
F
Felipe Balbi 已提交
1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407

	/* set/clear the stall and toggle bits */
	DBG(2, "%s: %s stall\n", ep->name, value ? "set" : "clear");
	if (musb_ep->is_in) {
		csr = musb_readw(epio, MUSB_TXCSR);
		csr |= MUSB_TXCSR_P_WZC_BITS
			| MUSB_TXCSR_CLRDATATOG;
		if (value)
			csr |= MUSB_TXCSR_P_SENDSTALL;
		else
			csr &= ~(MUSB_TXCSR_P_SENDSTALL
				| MUSB_TXCSR_P_SENTSTALL);
		csr &= ~MUSB_TXCSR_TXPKTRDY;
		musb_writew(epio, MUSB_TXCSR, csr);
	} else {
		csr = musb_readw(epio, MUSB_RXCSR);
		csr |= MUSB_RXCSR_P_WZC_BITS
			| MUSB_RXCSR_FLUSHFIFO
			| MUSB_RXCSR_CLRDATATOG;
		if (value)
			csr |= MUSB_RXCSR_P_SENDSTALL;
		else
			csr &= ~(MUSB_RXCSR_P_SENDSTALL
				| MUSB_RXCSR_P_SENTSTALL);
		musb_writew(epio, MUSB_RXCSR, csr);
	}

	/* maybe start the first request in the queue */
	if (!musb_ep->busy && !value && request) {
		DBG(3, "restarting the request\n");
		musb_ep_restart(musb, request);
	}

1408
done:
F
Felipe Balbi 已提交
1409 1410 1411 1412
	spin_unlock_irqrestore(&musb->lock, flags);
	return status;
}

1413 1414 1415
/*
 * Sets the halt feature with the clear requests ignored
 */
1416
static int musb_gadget_set_wedge(struct usb_ep *ep)
1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
{
	struct musb_ep		*musb_ep = to_musb_ep(ep);

	if (!ep)
		return -EINVAL;

	musb_ep->wedged = 1;

	return usb_ep_set_halt(ep);
}

F
Felipe Balbi 已提交
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
static int musb_gadget_fifo_status(struct usb_ep *ep)
{
	struct musb_ep		*musb_ep = to_musb_ep(ep);
	void __iomem		*epio = musb_ep->hw_ep->regs;
	int			retval = -EINVAL;

	if (musb_ep->desc && !musb_ep->is_in) {
		struct musb		*musb = musb_ep->musb;
		int			epnum = musb_ep->current_epnum;
		void __iomem		*mbase = musb->mregs;
		unsigned long		flags;

		spin_lock_irqsave(&musb->lock, flags);

		musb_ep_select(mbase, epnum);
		/* FIXME return zero unless RXPKTRDY is set */
		retval = musb_readw(epio, MUSB_RXCOUNT);

		spin_unlock_irqrestore(&musb->lock, flags);
	}
	return retval;
}

static void musb_gadget_fifo_flush(struct usb_ep *ep)
{
	struct musb_ep	*musb_ep = to_musb_ep(ep);
	struct musb	*musb = musb_ep->musb;
	u8		epnum = musb_ep->current_epnum;
	void __iomem	*epio = musb->endpoints[epnum].regs;
	void __iomem	*mbase;
	unsigned long	flags;
	u16		csr, int_txe;

	mbase = musb->mregs;

	spin_lock_irqsave(&musb->lock, flags);
	musb_ep_select(mbase, (u8) epnum);

	/* disable interrupts */
	int_txe = musb_readw(mbase, MUSB_INTRTXE);
	musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));

	if (musb_ep->is_in) {
		csr = musb_readw(epio, MUSB_TXCSR);
		if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
			csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_P_WZC_BITS;
			musb_writew(epio, MUSB_TXCSR, csr);
			/* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
			musb_writew(epio, MUSB_TXCSR, csr);
		}
	} else {
		csr = musb_readw(epio, MUSB_RXCSR);
		csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_P_WZC_BITS;
		musb_writew(epio, MUSB_RXCSR, csr);
		musb_writew(epio, MUSB_RXCSR, csr);
	}

	/* re-enable interrupt */
	musb_writew(mbase, MUSB_INTRTXE, int_txe);
	spin_unlock_irqrestore(&musb->lock, flags);
}

static const struct usb_ep_ops musb_ep_ops = {
	.enable		= musb_gadget_enable,
	.disable	= musb_gadget_disable,
	.alloc_request	= musb_alloc_request,
	.free_request	= musb_free_request,
	.queue		= musb_gadget_queue,
	.dequeue	= musb_gadget_dequeue,
	.set_halt	= musb_gadget_set_halt,
1498
	.set_wedge	= musb_gadget_set_wedge,
F
Felipe Balbi 已提交
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
	.fifo_status	= musb_gadget_fifo_status,
	.fifo_flush	= musb_gadget_fifo_flush
};

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

static int musb_gadget_get_frame(struct usb_gadget *gadget)
{
	struct musb	*musb = gadget_to_musb(gadget);

	return (int)musb_readw(musb->mregs, MUSB_FRAME);
}

static int musb_gadget_wakeup(struct usb_gadget *gadget)
{
	struct musb	*musb = gadget_to_musb(gadget);
	void __iomem	*mregs = musb->mregs;
	unsigned long	flags;
	int		status = -EINVAL;
	u8		power, devctl;
	int		retries;

	spin_lock_irqsave(&musb->lock, flags);

1523
	switch (musb->xceiv->state) {
F
Felipe Balbi 已提交
1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624
	case OTG_STATE_B_PERIPHERAL:
		/* NOTE:  OTG state machine doesn't include B_SUSPENDED;
		 * that's part of the standard usb 1.1 state machine, and
		 * doesn't affect OTG transitions.
		 */
		if (musb->may_wakeup && musb->is_suspended)
			break;
		goto done;
	case OTG_STATE_B_IDLE:
		/* Start SRP ... OTG not required. */
		devctl = musb_readb(mregs, MUSB_DEVCTL);
		DBG(2, "Sending SRP: devctl: %02x\n", devctl);
		devctl |= MUSB_DEVCTL_SESSION;
		musb_writeb(mregs, MUSB_DEVCTL, devctl);
		devctl = musb_readb(mregs, MUSB_DEVCTL);
		retries = 100;
		while (!(devctl & MUSB_DEVCTL_SESSION)) {
			devctl = musb_readb(mregs, MUSB_DEVCTL);
			if (retries-- < 1)
				break;
		}
		retries = 10000;
		while (devctl & MUSB_DEVCTL_SESSION) {
			devctl = musb_readb(mregs, MUSB_DEVCTL);
			if (retries-- < 1)
				break;
		}

		/* Block idling for at least 1s */
		musb_platform_try_idle(musb,
			jiffies + msecs_to_jiffies(1 * HZ));

		status = 0;
		goto done;
	default:
		DBG(2, "Unhandled wake: %s\n", otg_state_string(musb));
		goto done;
	}

	status = 0;

	power = musb_readb(mregs, MUSB_POWER);
	power |= MUSB_POWER_RESUME;
	musb_writeb(mregs, MUSB_POWER, power);
	DBG(2, "issue wakeup\n");

	/* FIXME do this next chunk in a timer callback, no udelay */
	mdelay(2);

	power = musb_readb(mregs, MUSB_POWER);
	power &= ~MUSB_POWER_RESUME;
	musb_writeb(mregs, MUSB_POWER, power);
done:
	spin_unlock_irqrestore(&musb->lock, flags);
	return status;
}

static int
musb_gadget_set_self_powered(struct usb_gadget *gadget, int is_selfpowered)
{
	struct musb	*musb = gadget_to_musb(gadget);

	musb->is_self_powered = !!is_selfpowered;
	return 0;
}

static void musb_pullup(struct musb *musb, int is_on)
{
	u8 power;

	power = musb_readb(musb->mregs, MUSB_POWER);
	if (is_on)
		power |= MUSB_POWER_SOFTCONN;
	else
		power &= ~MUSB_POWER_SOFTCONN;

	/* FIXME if on, HdrcStart; if off, HdrcStop */

	DBG(3, "gadget %s D+ pullup %s\n",
		musb->gadget_driver->function, is_on ? "on" : "off");
	musb_writeb(musb->mregs, MUSB_POWER, power);
}

#if 0
static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active)
{
	DBG(2, "<= %s =>\n", __func__);

	/*
	 * FIXME iff driver's softconnect flag is set (as it is during probe,
	 * though that can clear it), just musb_pullup().
	 */

	return -EINVAL;
}
#endif

static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
{
	struct musb	*musb = gadget_to_musb(gadget);

1625
	if (!musb->xceiv->set_power)
F
Felipe Balbi 已提交
1626
		return -EOPNOTSUPP;
1627
	return otg_set_power(musb->xceiv, mA);
F
Felipe Balbi 已提交
1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717
}

static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on)
{
	struct musb	*musb = gadget_to_musb(gadget);
	unsigned long	flags;

	is_on = !!is_on;

	/* NOTE: this assumes we are sensing vbus; we'd rather
	 * not pullup unless the B-session is active.
	 */
	spin_lock_irqsave(&musb->lock, flags);
	if (is_on != musb->softconnect) {
		musb->softconnect = is_on;
		musb_pullup(musb, is_on);
	}
	spin_unlock_irqrestore(&musb->lock, flags);
	return 0;
}

static const struct usb_gadget_ops musb_gadget_operations = {
	.get_frame		= musb_gadget_get_frame,
	.wakeup			= musb_gadget_wakeup,
	.set_selfpowered	= musb_gadget_set_self_powered,
	/* .vbus_session		= musb_gadget_vbus_session, */
	.vbus_draw		= musb_gadget_vbus_draw,
	.pullup			= musb_gadget_pullup,
};

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

/* Registration */

/* Only this registration code "knows" the rule (from USB standards)
 * about there being only one external upstream port.  It assumes
 * all peripheral ports are external...
 */
static struct musb *the_gadget;

static void musb_gadget_release(struct device *dev)
{
	/* kref_put(WHAT) */
	dev_dbg(dev, "%s\n", __func__);
}


static void __init
init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in)
{
	struct musb_hw_ep	*hw_ep = musb->endpoints + epnum;

	memset(ep, 0, sizeof *ep);

	ep->current_epnum = epnum;
	ep->musb = musb;
	ep->hw_ep = hw_ep;
	ep->is_in = is_in;

	INIT_LIST_HEAD(&ep->req_list);

	sprintf(ep->name, "ep%d%s", epnum,
			(!epnum || hw_ep->is_shared_fifo) ? "" : (
				is_in ? "in" : "out"));
	ep->end_point.name = ep->name;
	INIT_LIST_HEAD(&ep->end_point.ep_list);
	if (!epnum) {
		ep->end_point.maxpacket = 64;
		ep->end_point.ops = &musb_g_ep0_ops;
		musb->g.ep0 = &ep->end_point;
	} else {
		if (is_in)
			ep->end_point.maxpacket = hw_ep->max_packet_sz_tx;
		else
			ep->end_point.maxpacket = hw_ep->max_packet_sz_rx;
		ep->end_point.ops = &musb_ep_ops;
		list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list);
	}
}

/*
 * Initialize the endpoints exposed to peripheral drivers, with backlinks
 * to the rest of the driver state.
 */
static inline void __init musb_g_init_endpoints(struct musb *musb)
{
	u8			epnum;
	struct musb_hw_ep	*hw_ep;
	unsigned		count = 0;

1718
	/* initialize endpoint list just once */
F
Felipe Balbi 已提交
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
	INIT_LIST_HEAD(&(musb->g.ep_list));

	for (epnum = 0, hw_ep = musb->endpoints;
			epnum < musb->nr_endpoints;
			epnum++, hw_ep++) {
		if (hw_ep->is_shared_fifo /* || !epnum */) {
			init_peripheral_ep(musb, &hw_ep->ep_in, epnum, 0);
			count++;
		} else {
			if (hw_ep->max_packet_sz_tx) {
				init_peripheral_ep(musb, &hw_ep->ep_in,
							epnum, 1);
				count++;
			}
			if (hw_ep->max_packet_sz_rx) {
				init_peripheral_ep(musb, &hw_ep->ep_out,
							epnum, 0);
				count++;
			}
		}
	}
}

/* called once during driver setup to initialize and link into
 * the driver model; memory is zeroed.
 */
int __init musb_gadget_setup(struct musb *musb)
{
	int status;

	/* REVISIT minor race:  if (erroneously) setting up two
	 * musb peripherals at the same time, only the bus lock
	 * is probably held.
	 */
	if (the_gadget)
		return -EBUSY;
	the_gadget = musb;

	musb->g.ops = &musb_gadget_operations;
	musb->g.is_dualspeed = 1;
	musb->g.speed = USB_SPEED_UNKNOWN;

	/* this "gadget" abstracts/virtualizes the controller */
1762
	dev_set_name(&musb->g.dev, "gadget");
F
Felipe Balbi 已提交
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776
	musb->g.dev.parent = musb->controller;
	musb->g.dev.dma_mask = musb->controller->dma_mask;
	musb->g.dev.release = musb_gadget_release;
	musb->g.name = musb_driver_name;

	if (is_otg_enabled(musb))
		musb->g.is_otg = 1;

	musb_g_init_endpoints(musb);

	musb->is_active = 0;
	musb_platform_try_idle(musb, 0);

	status = device_register(&musb->g.dev);
1777 1778
	if (status != 0) {
		put_device(&musb->g.dev);
F
Felipe Balbi 已提交
1779
		the_gadget = NULL;
1780
	}
F
Felipe Balbi 已提交
1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798
	return status;
}

void musb_gadget_cleanup(struct musb *musb)
{
	if (musb != the_gadget)
		return;

	device_unregister(&musb->g.dev);
	the_gadget = NULL;
}

/*
 * Register the gadget driver. Used by gadget drivers when
 * registering themselves with the controller.
 *
 * -EINVAL something went wrong (not driver)
 * -EBUSY another gadget is already using the controller
1799
 * -ENOMEM no memory to perform the operation
F
Felipe Balbi 已提交
1800 1801
 *
 * @param driver the gadget driver
1802
 * @param bind the driver's bind function
F
Felipe Balbi 已提交
1803 1804
 * @return <0 if error, 0 if everything is fine
 */
1805 1806
int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
		int (*bind)(struct usb_gadget *))
F
Felipe Balbi 已提交
1807
{
1808 1809 1810
	struct musb		*musb = the_gadget;
	unsigned long		flags;
	int			retval = -EINVAL;
F
Felipe Balbi 已提交
1811 1812 1813

	if (!driver
			|| driver->speed != USB_SPEED_HIGH
1814
			|| !bind || !driver->setup)
1815
		goto err0;
F
Felipe Balbi 已提交
1816 1817

	/* driver must be initialized to support peripheral mode */
1818
	if (!musb) {
1819
		DBG(1, "no dev??\n");
1820 1821
		retval = -ENODEV;
		goto err0;
F
Felipe Balbi 已提交
1822 1823
	}

1824 1825
	pm_runtime_get_sync(musb->controller);

F
Felipe Balbi 已提交
1826 1827 1828 1829 1830 1831 1832
	DBG(3, "registering driver %s\n", driver->function);

	if (musb->gadget_driver) {
		DBG(1, "%s is already bound to %s\n",
				musb_driver_name,
				musb->gadget_driver->driver.name);
		retval = -EBUSY;
1833
		goto err0;
F
Felipe Balbi 已提交
1834 1835
	}

1836 1837 1838 1839 1840
	spin_lock_irqsave(&musb->lock, flags);
	musb->gadget_driver = driver;
	musb->g.dev.driver = &driver->driver;
	driver->driver.bus = NULL;
	musb->softconnect = 1;
F
Felipe Balbi 已提交
1841 1842
	spin_unlock_irqrestore(&musb->lock, flags);

1843 1844 1845 1846 1847 1848
	retval = bind(&musb->g);
	if (retval) {
		DBG(3, "bind to driver %s failed --> %d\n",
				driver->driver.name, retval);
		goto err1;
	}
F
Felipe Balbi 已提交
1849

1850
	spin_lock_irqsave(&musb->lock, flags);
F
Felipe Balbi 已提交
1851

1852 1853 1854
	otg_set_peripheral(musb->xceiv, &musb->g);
	musb->xceiv->state = OTG_STATE_B_IDLE;
	musb->is_active = 1;
F
Felipe Balbi 已提交
1855

1856 1857 1858 1859 1860 1861
	/*
	 * FIXME this ignores the softconnect flag.  Drivers are
	 * allowed hold the peripheral inactive until for example
	 * userspace hooks up printer hardware or DSP codecs, so
	 * hosts only see fully functional devices.
	 */
F
Felipe Balbi 已提交
1862

1863 1864
	if (!is_otg_enabled(musb))
		musb_start(musb);
F
Felipe Balbi 已提交
1865

1866
	otg_set_peripheral(musb->xceiv, &musb->g);
1867

1868
	spin_unlock_irqrestore(&musb->lock, flags);
F
Felipe Balbi 已提交
1869

1870 1871
	if (is_otg_enabled(musb)) {
		struct usb_hcd	*hcd = musb_to_hcd(musb);
1872

1873
		DBG(3, "OTG startup...\n");
F
Felipe Balbi 已提交
1874

1875 1876 1877 1878 1879 1880 1881 1882
		/* REVISIT:  funcall to other code, which also
		 * handles power budgeting ... this way also
		 * ensures HdrcStart is indirectly called.
		 */
		retval = usb_add_hcd(musb_to_hcd(musb), -1, 0);
		if (retval < 0) {
			DBG(1, "add_hcd failed, %d\n", retval);
			goto err2;
F
Felipe Balbi 已提交
1883
		}
1884

H
Hema HK 已提交
1885 1886 1887 1888
		if ((musb->xceiv->last_event == USB_EVENT_ID)
					&& musb->xceiv->set_vbus)
			otg_set_vbus(musb->xceiv, 1);

1889
		hcd->self.uses_pio_for_control = 1;
1890 1891 1892 1893

		if (musb->xceiv->last_event == USB_EVENT_NONE)
			pm_runtime_put(musb->controller);

F
Felipe Balbi 已提交
1894 1895
	}

1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906
	return 0;

err2:
	if (!is_otg_enabled(musb))
		musb_stop(musb);

err1:
	musb->gadget_driver = NULL;
	musb->g.dev.driver = NULL;

err0:
F
Felipe Balbi 已提交
1907 1908
	return retval;
}
1909
EXPORT_SYMBOL(usb_gadget_probe_driver);
F
Felipe Balbi 已提交
1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961

static void stop_activity(struct musb *musb, struct usb_gadget_driver *driver)
{
	int			i;
	struct musb_hw_ep	*hw_ep;

	/* don't disconnect if it's not connected */
	if (musb->g.speed == USB_SPEED_UNKNOWN)
		driver = NULL;
	else
		musb->g.speed = USB_SPEED_UNKNOWN;

	/* deactivate the hardware */
	if (musb->softconnect) {
		musb->softconnect = 0;
		musb_pullup(musb, 0);
	}
	musb_stop(musb);

	/* killing any outstanding requests will quiesce the driver;
	 * then report disconnect
	 */
	if (driver) {
		for (i = 0, hw_ep = musb->endpoints;
				i < musb->nr_endpoints;
				i++, hw_ep++) {
			musb_ep_select(musb->mregs, i);
			if (hw_ep->is_shared_fifo /* || !epnum */) {
				nuke(&hw_ep->ep_in, -ESHUTDOWN);
			} else {
				if (hw_ep->max_packet_sz_tx)
					nuke(&hw_ep->ep_in, -ESHUTDOWN);
				if (hw_ep->max_packet_sz_rx)
					nuke(&hw_ep->ep_out, -ESHUTDOWN);
			}
		}

		spin_unlock(&musb->lock);
		driver->disconnect(&musb->g);
		spin_lock(&musb->lock);
	}
}

/*
 * Unregister the gadget driver. Used by gadget drivers when
 * unregistering themselves from the controller.
 *
 * @param driver the gadget driver to unregister
 */
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
	struct musb	*musb = the_gadget;
1962
	unsigned long	flags;
F
Felipe Balbi 已提交
1963 1964 1965 1966

	if (!driver || !driver->unbind || !musb)
		return -EINVAL;

1967 1968 1969
	if (!musb->gadget_driver)
		return -EINVAL;

1970 1971 1972
	if (musb->xceiv->last_event == USB_EVENT_NONE)
		pm_runtime_get_sync(musb->controller);

1973 1974
	/*
	 * REVISIT always use otg_set_peripheral() here too;
F
Felipe Balbi 已提交
1975 1976 1977 1978 1979 1980 1981 1982 1983
	 * this needs to shut down the OTG engine.
	 */

	spin_lock_irqsave(&musb->lock, flags);

#ifdef	CONFIG_USB_MUSB_OTG
	musb_hnp_stop(musb);
#endif

1984
	(void) musb_gadget_vbus_draw(&musb->g, 0);
F
Felipe Balbi 已提交
1985

1986 1987 1988
	musb->xceiv->state = OTG_STATE_UNDEFINED;
	stop_activity(musb, driver);
	otg_set_peripheral(musb->xceiv, NULL);
F
Felipe Balbi 已提交
1989

1990
	DBG(3, "unregistering driver %s\n", driver->function);
F
Felipe Balbi 已提交
1991

1992 1993 1994
	spin_unlock_irqrestore(&musb->lock, flags);
	driver->unbind(&musb->g);
	spin_lock_irqsave(&musb->lock, flags);
F
Felipe Balbi 已提交
1995

1996 1997
	musb->gadget_driver = NULL;
	musb->g.dev.driver = NULL;
F
Felipe Balbi 已提交
1998

1999 2000
	musb->is_active = 0;
	musb_platform_try_idle(musb, 0);
F
Felipe Balbi 已提交
2001 2002
	spin_unlock_irqrestore(&musb->lock, flags);

2003
	if (is_otg_enabled(musb)) {
F
Felipe Balbi 已提交
2004 2005 2006 2007 2008 2009 2010
		usb_remove_hcd(musb_to_hcd(musb));
		/* FIXME we need to be able to register another
		 * gadget driver here and have everything work;
		 * that currently misbehaves.
		 */
	}

2011 2012 2013
	if (!is_otg_enabled(musb))
		musb_stop(musb);

2014 2015
	pm_runtime_put(musb->controller);

2016
	return 0;
F
Felipe Balbi 已提交
2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027
}
EXPORT_SYMBOL(usb_gadget_unregister_driver);


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

/* lifecycle operations called through plat_uds.c */

void musb_g_resume(struct musb *musb)
{
	musb->is_suspended = 0;
2028
	switch (musb->xceiv->state) {
F
Felipe Balbi 已提交
2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053
	case OTG_STATE_B_IDLE:
		break;
	case OTG_STATE_B_WAIT_ACON:
	case OTG_STATE_B_PERIPHERAL:
		musb->is_active = 1;
		if (musb->gadget_driver && musb->gadget_driver->resume) {
			spin_unlock(&musb->lock);
			musb->gadget_driver->resume(&musb->g);
			spin_lock(&musb->lock);
		}
		break;
	default:
		WARNING("unhandled RESUME transition (%s)\n",
				otg_state_string(musb));
	}
}

/* called when SOF packets stop for 3+ msec */
void musb_g_suspend(struct musb *musb)
{
	u8	devctl;

	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
	DBG(3, "devctl %02x\n", devctl);

2054
	switch (musb->xceiv->state) {
F
Felipe Balbi 已提交
2055 2056
	case OTG_STATE_B_IDLE:
		if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2057
			musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
F
Felipe Balbi 已提交
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102
		break;
	case OTG_STATE_B_PERIPHERAL:
		musb->is_suspended = 1;
		if (musb->gadget_driver && musb->gadget_driver->suspend) {
			spin_unlock(&musb->lock);
			musb->gadget_driver->suspend(&musb->g);
			spin_lock(&musb->lock);
		}
		break;
	default:
		/* REVISIT if B_HOST, clear DEVCTL.HOSTREQ;
		 * A_PERIPHERAL may need care too
		 */
		WARNING("unhandled SUSPEND transition (%s)\n",
				otg_state_string(musb));
	}
}

/* Called during SRP */
void musb_g_wakeup(struct musb *musb)
{
	musb_gadget_wakeup(&musb->g);
}

/* called when VBUS drops below session threshold, and in other cases */
void musb_g_disconnect(struct musb *musb)
{
	void __iomem	*mregs = musb->mregs;
	u8	devctl = musb_readb(mregs, MUSB_DEVCTL);

	DBG(3, "devctl %02x\n", devctl);

	/* clear HR */
	musb_writeb(mregs, MUSB_DEVCTL, devctl & MUSB_DEVCTL_SESSION);

	/* don't draw vbus until new b-default session */
	(void) musb_gadget_vbus_draw(&musb->g, 0);

	musb->g.speed = USB_SPEED_UNKNOWN;
	if (musb->gadget_driver && musb->gadget_driver->disconnect) {
		spin_unlock(&musb->lock);
		musb->gadget_driver->disconnect(&musb->g);
		spin_lock(&musb->lock);
	}

2103
	switch (musb->xceiv->state) {
F
Felipe Balbi 已提交
2104 2105 2106 2107
	default:
#ifdef	CONFIG_USB_MUSB_OTG
		DBG(2, "Unhandled disconnect %s, setting a_idle\n",
			otg_state_string(musb));
2108
		musb->xceiv->state = OTG_STATE_A_IDLE;
2109
		MUSB_HST_MODE(musb);
F
Felipe Balbi 已提交
2110 2111
		break;
	case OTG_STATE_A_PERIPHERAL:
2112
		musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2113
		MUSB_HST_MODE(musb);
F
Felipe Balbi 已提交
2114 2115 2116 2117 2118 2119
		break;
	case OTG_STATE_B_WAIT_ACON:
	case OTG_STATE_B_HOST:
#endif
	case OTG_STATE_B_PERIPHERAL:
	case OTG_STATE_B_IDLE:
2120
		musb->xceiv->state = OTG_STATE_B_IDLE;
F
Felipe Balbi 已提交
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175
		break;
	case OTG_STATE_B_SRP_INIT:
		break;
	}

	musb->is_active = 0;
}

void musb_g_reset(struct musb *musb)
__releases(musb->lock)
__acquires(musb->lock)
{
	void __iomem	*mbase = musb->mregs;
	u8		devctl = musb_readb(mbase, MUSB_DEVCTL);
	u8		power;

	DBG(3, "<== %s addr=%x driver '%s'\n",
			(devctl & MUSB_DEVCTL_BDEVICE)
				? "B-Device" : "A-Device",
			musb_readb(mbase, MUSB_FADDR),
			musb->gadget_driver
				? musb->gadget_driver->driver.name
				: NULL
			);

	/* report disconnect, if we didn't already (flushing EP state) */
	if (musb->g.speed != USB_SPEED_UNKNOWN)
		musb_g_disconnect(musb);

	/* clear HR */
	else if (devctl & MUSB_DEVCTL_HR)
		musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);


	/* what speed did we negotiate? */
	power = musb_readb(mbase, MUSB_POWER);
	musb->g.speed = (power & MUSB_POWER_HSMODE)
			? USB_SPEED_HIGH : USB_SPEED_FULL;

	/* start in USB_STATE_DEFAULT */
	musb->is_active = 1;
	musb->is_suspended = 0;
	MUSB_DEV_MODE(musb);
	musb->address = 0;
	musb->ep0_state = MUSB_EP0_STAGE_SETUP;

	musb->may_wakeup = 0;
	musb->g.b_hnp_enable = 0;
	musb->g.a_alt_hnp_support = 0;
	musb->g.a_hnp_support = 0;

	/* Normal reset, as B-Device;
	 * or else after HNP, as A-Device
	 */
	if (devctl & MUSB_DEVCTL_BDEVICE) {
2176
		musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
F
Felipe Balbi 已提交
2177 2178
		musb->g.is_a_peripheral = 0;
	} else if (is_otg_enabled(musb)) {
2179
		musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
F
Felipe Balbi 已提交
2180 2181 2182 2183 2184 2185 2186 2187
		musb->g.is_a_peripheral = 1;
	} else
		WARN_ON(1);

	/* start with default limits on VBUS power draw */
	(void) musb_gadget_vbus_draw(&musb->g,
			is_otg_enabled(musb) ? 8 : 100);
}