musb_gadget.c 57.6 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
	if (request->request.dma == DMA_ADDR_INVALID) {
150 151
		dev_vdbg(musb->controller,
				"not unmapping a never mapped buffer\n");
152 153
		return;
	}
154
	if (request->map_state == MUSB_MAPPED) {
155 156 157 158 159 160 161
		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;
162
	} else { /* PRE_MAPPED */
163 164 165 166 167 168 169
		dma_sync_single_for_cpu(musb->controller,
			request->request.dma,
			request->request.length,
			request->tx
				? DMA_TO_DEVICE
				: DMA_FROM_DEVICE);
	}
170
	request->map_state = UN_MAPPED;
171 172
}

F
Felipe Balbi 已提交
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192
/*
 * 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);

193
	list_del(&req->list);
F
Felipe Balbi 已提交
194 195 196 197 198 199
	if (req->request.status == -EINPROGRESS)
		req->request.status = status;
	musb = req->musb;

	ep->busy = 1;
	spin_unlock(&musb->lock);
200
	unmap_dma_buffer(req, musb);
F
Felipe Balbi 已提交
201
	if (request->status == 0)
202
		dev_dbg(musb->controller, "%s done request %p,  %d/%d\n",
F
Felipe Balbi 已提交
203 204 205
				ep->end_point.name, request,
				req->request.actual, req->request.length);
	else
206
		dev_dbg(musb->controller, "%s request %p, %d/%d fault %d\n",
F
Felipe Balbi 已提交
207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222
				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)
{
223
	struct musb		*musb = ep->musb;
F
Felipe Balbi 已提交
224 225 226 227 228 229 230 231
	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;
232

F
Felipe Balbi 已提交
233
		if (ep->is_in) {
234 235 236 237 238
			/*
			 * 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
239
			musb_writew(epio, MUSB_TXCSR,
240
				    MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO);
F
Felipe Balbi 已提交
241 242 243 244 245 246 247 248 249 250
			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);
251 252
		dev_dbg(musb->controller, "%s: abort DMA --> %d\n",
				ep->name, value);
F
Felipe Balbi 已提交
253 254 255 256
		c->channel_release(ep->dma);
		ep->dma = NULL;
	}

257 258
	while (!list_empty(&ep->req_list)) {
		req = list_first_entry(&ep->req_list, struct musb_request, list);
F
Felipe Balbi 已提交
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302
		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.
303
		  |		      -> stop DMA, ~DMAENAB,
F
Felipe Balbi 已提交
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
		  |		      -> 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) {
335
		dev_dbg(musb->controller, "dma pending...\n");
F
Felipe Balbi 已提交
336 337 338 339 340 341 342 343 344 345 346
		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) {
347
		dev_dbg(musb->controller, "%s old packet still ready , txcsr %03x\n",
F
Felipe Balbi 已提交
348 349 350 351 352
				musb_ep->end_point.name, csr);
		return;
	}

	if (csr & MUSB_TXCSR_P_SENDSTALL) {
353
		dev_dbg(musb->controller, "%s stalling, txcsr %03x\n",
F
Felipe Balbi 已提交
354 355 356 357
				musb_ep->end_point.name, csr);
		return;
	}

358
	dev_dbg(musb->controller, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x\n",
F
Felipe Balbi 已提交
359 360 361 362
			epnum, musb_ep->packet_sz, fifo_count,
			csr);

#ifndef	CONFIG_MUSB_PIO_ONLY
363
	if (is_buffer_mapped(req)) {
F
Felipe Balbi 已提交
364
		struct dma_controller	*c = musb->dma_controller;
365 366 367 368 369
		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
370 371 372 373 374

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

		/* MUSB_TXCSR_P_ISO is still set correctly */

375
#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
F
Felipe Balbi 已提交
376
		{
377
			if (request_size < musb_ep->packet_sz)
F
Felipe Balbi 已提交
378 379 380 381 382 383 384
				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
385
					request->dma + request->actual, request_size);
F
Felipe Balbi 已提交
386 387
			if (use_dma) {
				if (musb_ep->dma->desired_mode == 0) {
388 389 390 391 392 393 394 395 396 397 398
					/*
					 * 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
399 400 401
					csr |= (MUSB_TXCSR_DMAENAB |
							MUSB_TXCSR_MODE);
					/* against programming guide */
402 403
				} else {
					csr |= (MUSB_TXCSR_DMAENAB
F
Felipe Balbi 已提交
404 405
							| MUSB_TXCSR_DMAMODE
							| MUSB_TXCSR_MODE);
406 407 408
					if (!musb_ep->hb_mult)
						csr |= MUSB_TXCSR_AUTOSET;
				}
F
Felipe Balbi 已提交
409
				csr &= ~MUSB_TXCSR_P_UNDERRUN;
410

F
Felipe Balbi 已提交
411 412 413 414 415 416
				musb_writew(epio, MUSB_TXCSR, csr);
			}
		}

#elif defined(CONFIG_USB_TI_CPPI_DMA)
		/* program endpoint CSR first, then setup DMA */
417
		csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
418 419
		csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE |
		       MUSB_TXCSR_MODE;
F
Felipe Balbi 已提交
420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
		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,
440 441
				request->dma + request->actual,
				request_size);
F
Felipe Balbi 已提交
442 443 444
		if (!use_dma) {
			c->channel_release(musb_ep->dma);
			musb_ep->dma = NULL;
445 446
			csr &= ~MUSB_TXCSR_DMAENAB;
			musb_writew(epio, MUSB_TXCSR, csr);
F
Felipe Balbi 已提交
447 448 449 450 451 452
			/* 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,
453 454
				request->dma + request->actual,
				request_size);
F
Felipe Balbi 已提交
455 456 457 458 459
#endif
	}
#endif

	if (!use_dma) {
460 461 462 463
		/*
		 * Unmap the dma buffer back to cpu if dma channel
		 * programming fails
		 */
464
		unmap_dma_buffer(req, musb);
465

F
Felipe Balbi 已提交
466 467 468 469 470 471 472 473 474
		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... */
475
	dev_dbg(musb->controller, "%s TX/IN %s len %d/%d, txcsr %04x, fifo %d/%d\n",
F
Felipe Balbi 已提交
476 477 478 479 480 481 482 483 484 485 486 487 488 489
			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;
490
	struct musb_request	*req;
F
Felipe Balbi 已提交
491 492 493 494 495 496 497
	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);
498 499
	req = next_request(musb_ep);
	request = &req->request;
F
Felipe Balbi 已提交
500 501

	csr = musb_readw(epio, MUSB_TXCSR);
502
	dev_dbg(musb->controller, "<== %s, txcsr %04x\n", musb_ep->end_point.name, csr);
F
Felipe Balbi 已提交
503 504

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

	/*
	 * 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);
522 523
		dev_vdbg(musb->controller, "underrun on ep%d, req %p\n",
				epnum, request);
524 525 526 527 528 529
	}

	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
530
		 */
531
		dev_dbg(musb->controller, "%s dma still busy?\n", musb_ep->end_point.name);
532 533
		return;
	}
F
Felipe Balbi 已提交
534

535 536 537 538 539
	if (request) {
		u8	is_dma = 0;

		if (dma && (csr & MUSB_TXCSR_DMAENAB)) {
			is_dma = 1;
F
Felipe Balbi 已提交
540
			csr |= MUSB_TXCSR_P_WZC_BITS;
541
			csr &= ~(MUSB_TXCSR_DMAENAB | MUSB_TXCSR_P_UNDERRUN |
542
				 MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_AUTOSET);
F
Felipe Balbi 已提交
543
			musb_writew(epio, MUSB_TXCSR, csr);
544 545 546
			/* Ensure writebuffer is empty. */
			csr = musb_readw(epio, MUSB_TXCSR);
			request->actual += musb_ep->dma->actual_len;
547
			dev_dbg(musb->controller, "TXCSR%d %04x, DMA off, len %zu, req %p\n",
548
				epnum, csr, musb_ep->dma->actual_len, request);
F
Felipe Balbi 已提交
549 550
		}

551 552 553 554 555 556 557
		/*
		 * 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))
558
#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
559 560 561
			|| (is_dma && (!dma->desired_mode ||
				(request->actual &
					(musb_ep->packet_sz - 1))))
F
Felipe Balbi 已提交
562
#endif
563 564 565 566 567 568 569
		) {
			/*
			 * On DMA completion, FIFO may not be
			 * available yet...
			 */
			if (csr & MUSB_TXCSR_TXPKTRDY)
				return;
F
Felipe Balbi 已提交
570

571
			dev_dbg(musb->controller, "sending zero pkt\n");
572 573 574 575 576 577 578
			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);
579 580
			req = musb_ep->desc ? next_request(musb_ep) : NULL;
			if (!req) {
581
				dev_dbg(musb->controller, "%s idle now\n",
582 583
					musb_ep->end_point.name);
				return;
584
			}
F
Felipe Balbi 已提交
585 586
		}

587
		txstate(musb, req);
588
	}
F
Felipe Balbi 已提交
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
}

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

#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;
631
	struct musb_ep		*musb_ep;
F
Felipe Balbi 已提交
632
	void __iomem		*epio = musb->endpoints[epnum].regs;
633
	unsigned		fifo_count = 0;
634
	u16			len;
635
	u16			csr = musb_readw(epio, MUSB_RXCSR);
636 637 638 639 640 641 642 643
	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
644

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

	if (csr & MUSB_RXCSR_P_SENDSTALL) {
652
		dev_dbg(musb->controller, "%s stalling, RXCSR %04x\n",
653 654 655
		    musb_ep->end_point.name, csr);
		return;
	}
F
Felipe Balbi 已提交
656

657
	if (is_cppi_enabled() && is_buffer_mapped(req)) {
F
Felipe Balbi 已提交
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
		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
688
			if (is_buffer_mapped(req)) {
F
Felipe Balbi 已提交
689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717
				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;
718
#ifdef USE_MODE1
719
				csr |= MUSB_RXCSR_AUTOCLEAR;
F
Felipe Balbi 已提交
720 721 722 723 724 725 726 727
				/* 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);
728 729 730 731
#else
				if (!musb_ep->hb_mult &&
					musb_ep->hw_ep->rx_double_buffered)
					csr |= MUSB_RXCSR_AUTOCLEAR;
F
Felipe Balbi 已提交
732 733 734 735 736 737
#endif
				musb_writew(epio, MUSB_RXCSR, csr);

				if (request->actual < request->length) {
					int transfer_size = 0;
#ifdef USE_MODE1
738
					transfer_size = min(request->length - request->actual,
F
Felipe Balbi 已提交
739 740
							channel->max_len);
#else
741 742
					transfer_size = min(request->length - request->actual,
							(unsigned)len);
F
Felipe Balbi 已提交
743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758
#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)
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
					return;
			}
#elif defined(CONFIG_USB_UX500_DMA)
			if ((is_buffer_mapped(req)) &&
				(request->actual < request->length)) {

				struct dma_controller *c;
				struct dma_channel *channel;
				int transfer_size = 0;

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

				/* In case first packet is short */
				if (len < musb_ep->packet_sz)
					transfer_size = len;
				else if (request->short_not_ok)
					transfer_size =	min(request->length -
							request->actual,
							channel->max_len);
				else
					transfer_size = min(request->length -
							request->actual,
							(unsigned)len);

				csr &= ~MUSB_RXCSR_DMAMODE;
				csr |= (MUSB_RXCSR_DMAENAB |
					MUSB_RXCSR_AUTOCLEAR);

				musb_writew(epio, MUSB_RXCSR, csr);

				if (transfer_size <= musb_ep->packet_sz) {
					musb_ep->dma->desired_mode = 0;
				} else {
					musb_ep->dma->desired_mode = 1;
					/* Mode must be set after DMAENAB */
					csr |= MUSB_RXCSR_DMAMODE;
					musb_writew(epio, MUSB_RXCSR, csr);
				}

				if (c->channel_program(channel,
							musb_ep->packet_sz,
							channel->desired_mode,
							request->dma
							+ request->actual,
							transfer_size))

F
Felipe Balbi 已提交
806 807 808 809 810
					return;
			}
#endif	/* Mentor's DMA */

			fifo_count = request->length - request->actual;
811
			dev_dbg(musb->controller, "%s OUT/RX pio fifo %d/%d, maxpacket %d\n",
F
Felipe Balbi 已提交
812 813 814 815
					musb_ep->end_point.name,
					len, fifo_count,
					musb_ep->packet_sz);

816
			fifo_count = min_t(unsigned, len, fifo_count);
F
Felipe Balbi 已提交
817 818

#ifdef	CONFIG_USB_TUSB_OMAP_DMA
819
			if (tusb_dma_omap() && is_buffer_mapped(req)) {
F
Felipe Balbi 已提交
820 821 822 823 824 825 826 827 828 829 830 831 832 833
				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
834 835 836 837 838
			/*
			 * Unmap the dma buffer back to cpu if dma channel
			 * programming fails. This buffer is mapped if the
			 * channel allocation is successful
			 */
839
			 if (is_buffer_mapped(req)) {
840 841
				unmap_dma_buffer(req, musb);

842 843
				/*
				 * Clear DMAENAB and AUTOCLEAR for the
844 845
				 * PIO mode transfer
				 */
846
				csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR);
847 848
				musb_writew(epio, MUSB_RXCSR, csr);
			}
F
Felipe Balbi 已提交
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875

			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;
876
	struct musb_request	*req;
F
Felipe Balbi 已提交
877 878
	struct usb_request	*request;
	void __iomem		*mbase = musb->mregs;
879
	struct musb_ep		*musb_ep;
F
Felipe Balbi 已提交
880 881
	void __iomem		*epio = musb->endpoints[epnum].regs;
	struct dma_channel	*dma;
882 883 884 885 886 887
	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
888 889 890

	musb_ep_select(mbase, epnum);

891 892
	req = next_request(musb_ep);
	if (!req)
893
		return;
F
Felipe Balbi 已提交
894

895 896
	request = &req->request;

F
Felipe Balbi 已提交
897 898 899
	csr = musb_readw(epio, MUSB_RXCSR);
	dma = is_dma_capable() ? musb_ep->dma : NULL;

900
	dev_dbg(musb->controller, "<== %s, rxcsr %04x%s %p\n", musb_ep->end_point.name,
F
Felipe Balbi 已提交
901 902 903 904 905 906
			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);
907
		return;
F
Felipe Balbi 已提交
908 909 910 911 912 913 914
	}

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

915
		dev_dbg(musb->controller, "%s iso overrun on %p\n", musb_ep->name, request);
916
		if (request->status == -EINPROGRESS)
F
Felipe Balbi 已提交
917 918 919 920
			request->status = -EOVERFLOW;
	}
	if (csr & MUSB_RXCSR_INCOMPRX) {
		/* REVISIT not necessarily an error */
921
		dev_dbg(musb->controller, "%s, incomprx\n", musb_ep->end_point.name);
F
Felipe Balbi 已提交
922 923 924 925
	}

	if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
		/* "should not happen"; likely RXPKTRDY pending for DMA */
926
		dev_dbg(musb->controller, "%s busy, csr %04x\n",
F
Felipe Balbi 已提交
927
			musb_ep->end_point.name, csr);
928
		return;
F
Felipe Balbi 已提交
929 930 931 932 933 934 935 936 937 938 939
	}

	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;

940
		dev_dbg(musb->controller, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n",
F
Felipe Balbi 已提交
941 942 943 944
			epnum, csr,
			musb_readw(epio, MUSB_RXCSR),
			musb_ep->dma->actual_len, request);

945 946
#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
	defined(CONFIG_USB_UX500_DMA)
F
Felipe Balbi 已提交
947
		/* Autoclear doesn't clear RxPktRdy for short packets */
948
		if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered)
F
Felipe Balbi 已提交
949 950 951 952 953 954 955 956 957 958
				|| (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
959 960 961 962 963 964 965 966
					== 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;
967
			return;
968
		}
F
Felipe Balbi 已提交
969 970 971
#endif
		musb_g_giveback(musb_ep, request, 0);

972 973
		req = next_request(musb_ep);
		if (!req)
974
			return;
F
Felipe Balbi 已提交
975
	}
976 977
#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
	defined(CONFIG_USB_UX500_DMA)
978
exit:
979
#endif
980
	/* Analyze request */
981
	rxstate(musb, req);
F
Felipe Balbi 已提交
982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
}

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

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
1016
	musb_ep->type = usb_endpoint_type(desc);
F
Felipe Balbi 已提交
1017 1018

	/* check direction and (later) maxpacket size against endpoint */
J
Julia Lawall 已提交
1019
	if (usb_endpoint_num(desc) != epnum)
F
Felipe Balbi 已提交
1020 1021 1022 1023
		goto fail;

	/* REVISIT this rules out high bandwidth periodic transfers */
	tmp = le16_to_cpu(desc->wMaxPacketSize);
1024 1025 1026 1027 1028 1029 1030 1031 1032
	if (tmp & ~0x07ff) {
		int ok;

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

		if (!ok) {
1033
			dev_dbg(musb->controller, "no support for high bandwidth ISO\n");
1034 1035 1036 1037 1038 1039 1040 1041 1042
			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
1043 1044 1045 1046 1047

	/* 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
1048
	if (usb_endpoint_dir_in(desc)) {
F
Felipe Balbi 已提交
1049 1050 1051 1052 1053 1054
		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;
1055 1056

		if (tmp > hw_ep->max_packet_sz_tx) {
1057
			dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
F
Felipe Balbi 已提交
1058
			goto fail;
1059
		}
F
Felipe Balbi 已提交
1060 1061 1062 1063 1064 1065 1066

		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
		 */
1067
		/* Set TXMAXP with the FIFO size of the endpoint
1068
		 * to disable double buffering mode.
1069
		 */
1070 1071 1072 1073 1074
		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
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094

		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;
1095 1096

		if (tmp > hw_ep->max_packet_sz_rx) {
1097
			dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
F
Felipe Balbi 已提交
1098
			goto fail;
1099
		}
F
Felipe Balbi 已提交
1100 1101 1102 1103 1104 1105 1106

		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
		 */
1107 1108 1109
		/* Set RXMAXP with the FIFO size of the endpoint
		 * to disable double buffering mode.
		 */
1110 1111 1112 1113 1114
		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
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

		/* 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;
1147
	musb_ep->wedged = 0;
F
Felipe Balbi 已提交
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
	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);

1210
	dev_dbg(musb->controller, "%s\n", musb_ep->end_point.name);
F
Felipe Balbi 已提交
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221

	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);
1222
	struct musb		*musb = musb_ep->musb;
F
Felipe Balbi 已提交
1223 1224 1225
	struct musb_request	*request = NULL;

	request = kzalloc(sizeof *request, gfp_flags);
1226
	if (!request) {
1227
		dev_dbg(musb->controller, "not enough memory\n");
1228
		return NULL;
F
Felipe Balbi 已提交
1229 1230
	}

1231 1232 1233 1234
	request->request.dma = DMA_ADDR_INVALID;
	request->epnum = musb_ep->current_epnum;
	request->ep = musb_ep;

F
Felipe Balbi 已提交
1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
	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.
 */
1259
void musb_ep_restart(struct musb *musb, struct musb_request *req)
F
Felipe Balbi 已提交
1260
{
1261
	dev_dbg(musb->controller, "<== %s request %p len %u on hw_ep%d\n",
F
Felipe Balbi 已提交
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
		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;

1295
	dev_dbg(musb->controller, "<== to %s request=%p\n", ep->name, req);
F
Felipe Balbi 已提交
1296 1297 1298 1299 1300 1301 1302

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

1303
	map_dma_buffer(request, musb, musb_ep);
F
Felipe Balbi 已提交
1304 1305 1306 1307 1308

	spin_lock_irqsave(&musb->lock, lockflags);

	/* don't queue if the ep is down */
	if (!musb_ep->desc) {
1309
		dev_dbg(musb->controller, "req %p queued to %s while ep %s\n",
F
Felipe Balbi 已提交
1310 1311 1312 1313 1314 1315
				req, ep->name, "disabled");
		status = -ESHUTDOWN;
		goto cleanup;
	}

	/* add request to the list */
1316
	list_add_tail(&request->list, &musb_ep->req_list);
F
Felipe Balbi 已提交
1317 1318

	/* it this is the head of the queue, start i/o ... */
1319
	if (!musb_ep->busy && &request->list == musb_ep->req_list.next)
F
Felipe Balbi 已提交
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329
		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);
1330 1331
	struct musb_request	*req = to_musb_request(request);
	struct musb_request	*r;
F
Felipe Balbi 已提交
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
	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) {
1342
		if (r == req)
F
Felipe Balbi 已提交
1343 1344
			break;
	}
1345
	if (r != req) {
1346
		dev_dbg(musb->controller, "request %p not queued to %s\n", request, ep->name);
F
Felipe Balbi 已提交
1347 1348 1349 1350 1351
		status = -EINVAL;
		goto done;
	}

	/* if the hardware doesn't have the request, easy ... */
1352
	if (musb_ep->req_list.next != &req->list || musb_ep->busy)
F
Felipe Balbi 已提交
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
		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
 */
1384
static int musb_gadget_set_halt(struct usb_ep *ep, int value)
F
Felipe Balbi 已提交
1385 1386 1387 1388 1389 1390 1391 1392
{
	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;
1393
	struct musb_request	*request;
F
Felipe Balbi 已提交
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408
	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);

1409
	request = next_request(musb_ep);
1410 1411
	if (value) {
		if (request) {
1412
			dev_dbg(musb->controller, "request in progress, cannot halt %s\n",
1413 1414 1415 1416 1417 1418 1419 1420
			    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) {
1421
				dev_dbg(musb->controller, "FIFO busy, cannot halt %s\n", ep->name);
1422 1423 1424
				status = -EAGAIN;
				goto done;
			}
F
Felipe Balbi 已提交
1425
		}
1426 1427
	} else
		musb_ep->wedged = 0;
F
Felipe Balbi 已提交
1428 1429

	/* set/clear the stall and toggle bits */
1430
	dev_dbg(musb->controller, "%s: %s stall\n", ep->name, value ? "set" : "clear");
F
Felipe Balbi 已提交
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
	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) {
1457
		dev_dbg(musb->controller, "restarting the request\n");
F
Felipe Balbi 已提交
1458 1459 1460
		musb_ep_restart(musb, request);
	}

1461
done:
F
Felipe Balbi 已提交
1462 1463 1464 1465
	spin_unlock_irqrestore(&musb->lock, flags);
	return status;
}

1466 1467 1468
/*
 * Sets the halt feature with the clear requests ignored
 */
1469
static int musb_gadget_set_wedge(struct usb_ep *ep)
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
{
	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
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
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;
1527 1528 1529 1530 1531 1532
			/*
			 * Setting both TXPKTRDY and FLUSHFIFO makes controller
			 * to interrupt current FIFO loading, but not flushing
			 * the already loaded ones.
			 */
			csr &= ~MUSB_TXCSR_TXPKTRDY;
F
Felipe Balbi 已提交
1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
			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,
1557
	.set_wedge	= musb_gadget_set_wedge,
F
Felipe Balbi 已提交
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
	.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);

1582
	switch (musb->xceiv->state) {
F
Felipe Balbi 已提交
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593
	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);
1594
		dev_dbg(musb->controller, "Sending SRP: devctl: %02x\n", devctl);
F
Felipe Balbi 已提交
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
		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;
		}

1611 1612 1613 1614
		spin_unlock_irqrestore(&musb->lock, flags);
		otg_start_srp(musb->xceiv);
		spin_lock_irqsave(&musb->lock, flags);

F
Felipe Balbi 已提交
1615 1616 1617 1618 1619 1620 1621
		/* Block idling for at least 1s */
		musb_platform_try_idle(musb,
			jiffies + msecs_to_jiffies(1 * HZ));

		status = 0;
		goto done;
	default:
1622
		dev_dbg(musb->controller, "Unhandled wake: %s\n",
1623
			otg_state_string(musb->xceiv->state));
F
Felipe Balbi 已提交
1624 1625 1626 1627 1628 1629 1630 1631
		goto done;
	}

	status = 0;

	power = musb_readb(mregs, MUSB_POWER);
	power |= MUSB_POWER_RESUME;
	musb_writeb(mregs, MUSB_POWER, power);
1632
	dev_dbg(musb->controller, "issue wakeup\n");
F
Felipe Balbi 已提交
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

	/* 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 */

1666 1667
	dev_dbg(musb->controller, "gadget D+ pullup %s\n",
		is_on ? "on" : "off");
F
Felipe Balbi 已提交
1668 1669 1670 1671 1672 1673
	musb_writeb(musb->mregs, MUSB_POWER, power);
}

#if 0
static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active)
{
1674
	dev_dbg(musb->controller, "<= %s =>\n", __func__);
F
Felipe Balbi 已提交
1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688

	/*
	 * 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);

1689
	if (!musb->xceiv->set_power)
F
Felipe Balbi 已提交
1690
		return -EOPNOTSUPP;
1691
	return otg_set_power(musb->xceiv, mA);
F
Felipe Balbi 已提交
1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712
}

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;
}

1713 1714 1715 1716
static int musb_gadget_start(struct usb_gadget *g,
		struct usb_gadget_driver *driver);
static int musb_gadget_stop(struct usb_gadget *g,
		struct usb_gadget_driver *driver);
1717

F
Felipe Balbi 已提交
1718 1719 1720 1721 1722 1723 1724
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,
1725 1726
	.udc_start		= musb_gadget_start,
	.udc_stop		= musb_gadget_stop,
F
Felipe Balbi 已提交
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 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
};

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

/* 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 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;

1788
	/* initialize endpoint list just once */
F
Felipe Balbi 已提交
1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828
	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.
	 */

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

	/* this "gadget" abstracts/virtualizes the controller */
1829
	dev_set_name(&musb->g.dev, "gadget");
F
Felipe Balbi 已提交
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
	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);
1844 1845
	if (status != 0) {
		put_device(&musb->g.dev);
1846
		return status;
1847
	}
1848 1849 1850 1851 1852 1853 1854
	status = usb_add_gadget_udc(musb->controller, &musb->g);
	if (status)
		goto err;

	return 0;
err:
	device_unregister(&musb->g.dev);
F
Felipe Balbi 已提交
1855 1856 1857 1858 1859
	return status;
}

void musb_gadget_cleanup(struct musb *musb)
{
1860
	usb_del_gadget_udc(&musb->g);
F
Felipe Balbi 已提交
1861 1862 1863 1864 1865 1866 1867 1868 1869
	device_unregister(&musb->g.dev);
}

/*
 * 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
1870
 * -ENOMEM no memory to perform the operation
F
Felipe Balbi 已提交
1871 1872 1873 1874
 *
 * @param driver the gadget driver
 * @return <0 if error, 0 if everything is fine
 */
1875 1876
static int musb_gadget_start(struct usb_gadget *g,
		struct usb_gadget_driver *driver)
F
Felipe Balbi 已提交
1877
{
1878
	struct musb		*musb = gadget_to_musb(g);
1879 1880
	unsigned long		flags;
	int			retval = -EINVAL;
F
Felipe Balbi 已提交
1881

1882
	if (driver->speed != USB_SPEED_HIGH)
1883
		goto err0;
F
Felipe Balbi 已提交
1884

1885 1886
	pm_runtime_get_sync(musb->controller);

1887
	dev_dbg(musb->controller, "registering driver %s\n", driver->function);
F
Felipe Balbi 已提交
1888

1889
	musb->softconnect = 0;
1890
	musb->gadget_driver = driver;
F
Felipe Balbi 已提交
1891

1892
	spin_lock_irqsave(&musb->lock, flags);
1893
	musb->is_active = 1;
F
Felipe Balbi 已提交
1894

1895 1896
	otg_set_peripheral(musb->xceiv, &musb->g);
	musb->xceiv->state = OTG_STATE_B_IDLE;
F
Felipe Balbi 已提交
1897

1898 1899 1900 1901 1902 1903
	/*
	 * 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
1904

1905 1906
	if (!is_otg_enabled(musb))
		musb_start(musb);
F
Felipe Balbi 已提交
1907

1908
	spin_unlock_irqrestore(&musb->lock, flags);
F
Felipe Balbi 已提交
1909

1910 1911
	if (is_otg_enabled(musb)) {
		struct usb_hcd	*hcd = musb_to_hcd(musb);
1912

1913
		dev_dbg(musb->controller, "OTG startup...\n");
F
Felipe Balbi 已提交
1914

1915 1916 1917 1918 1919 1920
		/* 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) {
1921
			dev_dbg(musb->controller, "add_hcd failed, %d\n", retval);
1922
			goto err2;
F
Felipe Balbi 已提交
1923
		}
1924

H
Hema HK 已提交
1925 1926 1927 1928
		if ((musb->xceiv->last_event == USB_EVENT_ID)
					&& musb->xceiv->set_vbus)
			otg_set_vbus(musb->xceiv, 1);

1929
		hcd->self.uses_pio_for_control = 1;
F
Felipe Balbi 已提交
1930
	}
1931 1932
	if (musb->xceiv->last_event == USB_EVENT_NONE)
		pm_runtime_put(musb->controller);
F
Felipe Balbi 已提交
1933

1934 1935 1936 1937 1938 1939
	return 0;

err2:
	if (!is_otg_enabled(musb))
		musb_stop(musb);
err0:
F
Felipe Balbi 已提交
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990
	return retval;
}

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
 */
1991 1992
static int musb_gadget_stop(struct usb_gadget *g,
		struct usb_gadget_driver *driver)
F
Felipe Balbi 已提交
1993
{
1994
	struct musb	*musb = gadget_to_musb(g);
1995
	unsigned long	flags;
F
Felipe Balbi 已提交
1996

1997 1998 1999
	if (musb->xceiv->last_event == USB_EVENT_NONE)
		pm_runtime_get_sync(musb->controller);

2000 2001
	/*
	 * REVISIT always use otg_set_peripheral() here too;
F
Felipe Balbi 已提交
2002 2003 2004 2005 2006 2007 2008
	 * this needs to shut down the OTG engine.
	 */

	spin_lock_irqsave(&musb->lock, flags);

	musb_hnp_stop(musb);

2009
	(void) musb_gadget_vbus_draw(&musb->g, 0);
F
Felipe Balbi 已提交
2010

2011 2012 2013
	musb->xceiv->state = OTG_STATE_UNDEFINED;
	stop_activity(musb, driver);
	otg_set_peripheral(musb->xceiv, NULL);
F
Felipe Balbi 已提交
2014

2015
	dev_dbg(musb->controller, "unregistering driver %s\n", driver->function);
F
Felipe Balbi 已提交
2016

2017 2018
	musb->is_active = 0;
	musb_platform_try_idle(musb, 0);
F
Felipe Balbi 已提交
2019 2020
	spin_unlock_irqrestore(&musb->lock, flags);

2021
	if (is_otg_enabled(musb)) {
F
Felipe Balbi 已提交
2022 2023 2024 2025 2026 2027 2028
		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.
		 */
	}

2029 2030 2031
	if (!is_otg_enabled(musb))
		musb_stop(musb);

2032 2033
	pm_runtime_put(musb->controller);

2034
	return 0;
F
Felipe Balbi 已提交
2035 2036 2037 2038 2039 2040 2041 2042 2043
}

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

/* lifecycle operations called through plat_uds.c */

void musb_g_resume(struct musb *musb)
{
	musb->is_suspended = 0;
2044
	switch (musb->xceiv->state) {
F
Felipe Balbi 已提交
2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057
	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",
2058
				otg_state_string(musb->xceiv->state));
F
Felipe Balbi 已提交
2059 2060 2061 2062 2063 2064 2065 2066 2067
	}
}

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

	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2068
	dev_dbg(musb->controller, "devctl %02x\n", devctl);
F
Felipe Balbi 已提交
2069

2070
	switch (musb->xceiv->state) {
F
Felipe Balbi 已提交
2071 2072
	case OTG_STATE_B_IDLE:
		if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2073
			musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
F
Felipe Balbi 已提交
2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087
		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",
2088
				otg_state_string(musb->xceiv->state));
F
Felipe Balbi 已提交
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103
	}
}

/* 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);

2104
	dev_dbg(musb->controller, "devctl %02x\n", devctl);
F
Felipe Balbi 已提交
2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118

	/* 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);
	}

2119
	switch (musb->xceiv->state) {
F
Felipe Balbi 已提交
2120
	default:
2121
		dev_dbg(musb->controller, "Unhandled disconnect %s, setting a_idle\n",
2122
			otg_state_string(musb->xceiv->state));
2123
		musb->xceiv->state = OTG_STATE_A_IDLE;
2124
		MUSB_HST_MODE(musb);
F
Felipe Balbi 已提交
2125 2126
		break;
	case OTG_STATE_A_PERIPHERAL:
2127
		musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2128
		MUSB_HST_MODE(musb);
F
Felipe Balbi 已提交
2129 2130 2131 2132 2133
		break;
	case OTG_STATE_B_WAIT_ACON:
	case OTG_STATE_B_HOST:
	case OTG_STATE_B_PERIPHERAL:
	case OTG_STATE_B_IDLE:
2134
		musb->xceiv->state = OTG_STATE_B_IDLE;
F
Felipe Balbi 已提交
2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150
		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;

2151
	dev_dbg(musb->controller, "<== %s addr=%x driver '%s'\n",
F
Felipe Balbi 已提交
2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189
			(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) {
2190
		musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
F
Felipe Balbi 已提交
2191 2192
		musb->g.is_a_peripheral = 0;
	} else if (is_otg_enabled(musb)) {
2193
		musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
F
Felipe Balbi 已提交
2194 2195 2196 2197 2198 2199 2200 2201
		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);
}