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Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / usb / musb / musb_gadget.c
blob3f79e7f9a9eef9bc561ac32e2df68b188dc86d61
1 /*
2 * MUSB OTG driver peripheral support
3 *
4 * Copyright 2005 Mentor Graphics Corporation
5 * Copyright (C) 2005-2006 by Texas Instruments
6 * Copyright (C) 2006-2007 Nokia Corporation
7 * Copyright (C) 2009 MontaVista Software, Inc. <source@mvista.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 * 02110-1301 USA
22 *
23 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
26 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
29 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
30 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 */
35
36 #include <linux/kernel.h>
37 #include <linux/list.h>
38 #include <linux/timer.h>
39 #include <linux/module.h>
40 #include <linux/smp.h>
41 #include <linux/spinlock.h>
42 #include <linux/delay.h>
43 #include <linux/moduleparam.h>
44 #include <linux/stat.h>
45 #include <linux/dma-mapping.h>
46 #include <linux/slab.h>
47
48 #include "musb_core.h"
49
50
51 /* MUSB PERIPHERAL status 3-mar-2006:
52 *
53 * - EP0 seems solid. It passes both USBCV and usbtest control cases.
54 * Minor glitches:
55 *
56 * + remote wakeup to Linux hosts work, but saw USBCV failures;
57 * in one test run (operator error?)
58 * + endpoint halt tests -- in both usbtest and usbcv -- seem
59 * to break when dma is enabled ... is something wrongly
60 * clearing SENDSTALL?
61 *
62 * - Mass storage behaved ok when last tested. Network traffic patterns
63 * (with lots of short transfers etc) need retesting; they turn up the
64 * worst cases of the DMA, since short packets are typical but are not
65 * required.
66 *
67 * - TX/IN
68 * + both pio and dma behave in with network and g_zero tests
69 * + no cppi throughput issues other than no-hw-queueing
70 * + failed with FLAT_REG (DaVinci)
71 * + seems to behave with double buffering, PIO -and- CPPI
72 * + with gadgetfs + AIO, requests got lost?
73 *
74 * - RX/OUT
75 * + both pio and dma behave in with network and g_zero tests
76 * + dma is slow in typical case (short_not_ok is clear)
77 * + double buffering ok with PIO
78 * + double buffering *FAILS* with CPPI, wrong data bytes sometimes
79 * + request lossage observed with gadgetfs
80 *
81 * - ISO not tested ... might work, but only weakly isochronous
82 *
83 * - Gadget driver disabling of softconnect during bind() is ignored; so
84 * drivers can't hold off host requests until userspace is ready.
85 * (Workaround: they can turn it off later.)
86 *
87 * - PORTABILITY (assumes PIO works):
88 * + DaVinci, basically works with cppi dma
89 * + OMAP 2430, ditto with mentor dma
90 * + TUSB 6010, platform-specific dma in the works
91 */
92
93 /* ----------------------------------------------------------------------- */
94
95 #define is_buffer_mapped(req) (is_dma_capable() && \
96 (req->map_state != UN_MAPPED))
97
98 /* Maps the buffer to dma */
99
100 static inline void map_dma_buffer(struct musb_request *request,
101 struct musb *musb, struct musb_ep *musb_ep)
102 {
103 int compatible = true;
104 struct dma_controller *dma = musb->dma_controller;
105
106 request->map_state = UN_MAPPED;
107
108 if (!is_dma_capable() || !musb_ep->dma)
109 return;
110
111 /* Check if DMA engine can handle this request.
112 * DMA code must reject the USB request explicitly.
113 * Default behaviour is to map the request.
114 */
115 if (dma->is_compatible)
116 compatible = dma->is_compatible(musb_ep->dma,
117 musb_ep->packet_sz, request->request.buf,
118 request->request.length);
119 if (!compatible)
120 return;
121
122 if (request->request.dma == DMA_ADDR_INVALID) {
123 request->request.dma = dma_map_single(
124 musb->controller,
125 request->request.buf,
126 request->request.length,
127 request->tx
128 ? DMA_TO_DEVICE
129 : DMA_FROM_DEVICE);
130 request->map_state = MUSB_MAPPED;
131 } else {
132 dma_sync_single_for_device(musb->controller,
133 request->request.dma,
134 request->request.length,
135 request->tx
136 ? DMA_TO_DEVICE
137 : DMA_FROM_DEVICE);
138 request->map_state = PRE_MAPPED;
139 }
140 }
141
142 /* Unmap the buffer from dma and maps it back to cpu */
143 static inline void unmap_dma_buffer(struct musb_request *request,
144 struct musb *musb)
145 {
146 if (!is_buffer_mapped(request))
147 return;
148
149 if (request->request.dma == DMA_ADDR_INVALID) {
150 dev_vdbg(musb->controller,
151 "not unmapping a never mapped buffer\n");
152 return;
153 }
154 if (request->map_state == MUSB_MAPPED) {
155 dma_unmap_single(musb->controller,
156 request->request.dma,
157 request->request.length,
158 request->tx
159 ? DMA_TO_DEVICE
160 : DMA_FROM_DEVICE);
161 request->request.dma = DMA_ADDR_INVALID;
162 } else { /* PRE_MAPPED */
163 dma_sync_single_for_cpu(musb->controller,
164 request->request.dma,
165 request->request.length,
166 request->tx
167 ? DMA_TO_DEVICE
168 : DMA_FROM_DEVICE);
169 }
170 request->map_state = UN_MAPPED;
171 }
172
173 /*
174 * Immediately complete a request.
175 *
176 * @param request the request to complete
177 * @param status the status to complete the request with
178 * Context: controller locked, IRQs blocked.
179 */
180 void musb_g_giveback(
181 struct musb_ep *ep,
182 struct usb_request *request,
183 int status)
184 __releases(ep->musb->lock)
185 __acquires(ep->musb->lock)
186 {
187 struct musb_request *req;
188 struct musb *musb;
189 int busy = ep->busy;
190
191 req = to_musb_request(request);
192
193 list_del(&req->list);
194 if (req->request.status == -EINPROGRESS)
195 req->request.status = status;
196 musb = req->musb;
197
198 ep->busy = 1;
199 spin_unlock(&musb->lock);
200 unmap_dma_buffer(req, musb);
201 if (request->status == 0)
202 dev_dbg(musb->controller, "%s done request %p, %d/%d\n",
203 ep->end_point.name, request,
204 req->request.actual, req->request.length);
205 else
206 dev_dbg(musb->controller, "%s request %p, %d/%d fault %d\n",
207 ep->end_point.name, request,
208 req->request.actual, req->request.length,
209 request->status);
210 req->request.complete(&req->ep->end_point, &req->request);
211 spin_lock(&musb->lock);
212 ep->busy = busy;
213 }
214
215 /* ----------------------------------------------------------------------- */
216
217 /*
218 * Abort requests queued to an endpoint using the status. Synchronous.
219 * caller locked controller and blocked irqs, and selected this ep.
220 */
221 static void nuke(struct musb_ep *ep, const int status)
222 {
223 struct musb *musb = ep->musb;
224 struct musb_request *req = NULL;
225 void __iomem *epio = ep->musb->endpoints[ep->current_epnum].regs;
226
227 ep->busy = 1;
228
229 if (is_dma_capable() && ep->dma) {
230 struct dma_controller *c = ep->musb->dma_controller;
231 int value;
232
233 if (ep->is_in) {
234 /*
235 * The programming guide says that we must not clear
236 * the DMAMODE bit before DMAENAB, so we only
237 * clear it in the second write...
238 */
239 musb_writew(epio, MUSB_TXCSR,
240 MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO);
241 musb_writew(epio, MUSB_TXCSR,
242 0 | MUSB_TXCSR_FLUSHFIFO);
243 } else {
244 musb_writew(epio, MUSB_RXCSR,
245 0 | MUSB_RXCSR_FLUSHFIFO);
246 musb_writew(epio, MUSB_RXCSR,
247 0 | MUSB_RXCSR_FLUSHFIFO);
248 }
249
250 value = c->channel_abort(ep->dma);
251 dev_dbg(musb->controller, "%s: abort DMA --> %d\n",
252 ep->name, value);
253 c->channel_release(ep->dma);
254 ep->dma = NULL;
255 }
256
257 while (!list_empty(&ep->req_list)) {
258 req = list_first_entry(&ep->req_list, struct musb_request, list);
259 musb_g_giveback(ep, &req->request, status);
260 }
261 }
262
263 /* ----------------------------------------------------------------------- */
264
265 /* Data transfers - pure PIO, pure DMA, or mixed mode */
266
267 /*
268 * This assumes the separate CPPI engine is responding to DMA requests
269 * from the usb core ... sequenced a bit differently from mentor dma.
270 */
271
272 static inline int max_ep_writesize(struct musb *musb, struct musb_ep *ep)
273 {
274 if (can_bulk_split(musb, ep->type))
275 return ep->hw_ep->max_packet_sz_tx;
276 else
277 return ep->packet_sz;
278 }
279
280
281 #ifdef CONFIG_USB_INVENTRA_DMA
282
283 /* Peripheral tx (IN) using Mentor DMA works as follows:
284 Only mode 0 is used for transfers <= wPktSize,
285 mode 1 is used for larger transfers,
286
287 One of the following happens:
288 - Host sends IN token which causes an endpoint interrupt
289 -> TxAvail
290 -> if DMA is currently busy, exit.
291 -> if queue is non-empty, txstate().
292
293 - Request is queued by the gadget driver.
294 -> if queue was previously empty, txstate()
295
296 txstate()
297 -> start
298 /\ -> setup DMA
299 | (data is transferred to the FIFO, then sent out when
300 | IN token(s) are recd from Host.
301 | -> DMA interrupt on completion
302 | calls TxAvail.
303 | -> stop DMA, ~DMAENAB,
304 | -> set TxPktRdy for last short pkt or zlp
305 | -> Complete Request
306 | -> Continue next request (call txstate)
307 |___________________________________|
308
309 * Non-Mentor DMA engines can of course work differently, such as by
310 * upleveling from irq-per-packet to irq-per-buffer.
311 */
312
313 #endif
314
315 /*
316 * An endpoint is transmitting data. This can be called either from
317 * the IRQ routine or from ep.queue() to kickstart a request on an
318 * endpoint.
319 *
320 * Context: controller locked, IRQs blocked, endpoint selected
321 */
322 static void txstate(struct musb *musb, struct musb_request *req)
323 {
324 u8 epnum = req->epnum;
325 struct musb_ep *musb_ep;
326 void __iomem *epio = musb->endpoints[epnum].regs;
327 struct usb_request *request;
328 u16 fifo_count = 0, csr;
329 int use_dma = 0;
330
331 musb_ep = req->ep;
332
333 /* we shouldn't get here while DMA is active ... but we do ... */
334 if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
335 dev_dbg(musb->controller, "dma pending...\n");
336 return;
337 }
338
339 /* read TXCSR before */
340 csr = musb_readw(epio, MUSB_TXCSR);
341
342 request = &req->request;
343 fifo_count = min(max_ep_writesize(musb, musb_ep),
344 (int)(request->length - request->actual));
345
346 if (csr & MUSB_TXCSR_TXPKTRDY) {
347 dev_dbg(musb->controller, "%s old packet still ready , txcsr %03x\n",
348 musb_ep->end_point.name, csr);
349 return;
350 }
351
352 if (csr & MUSB_TXCSR_P_SENDSTALL) {
353 dev_dbg(musb->controller, "%s stalling, txcsr %03x\n",
354 musb_ep->end_point.name, csr);
355 return;
356 }
357
358 dev_dbg(musb->controller, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x\n",
359 epnum, musb_ep->packet_sz, fifo_count,
360 csr);
361
362 #ifndef CONFIG_MUSB_PIO_ONLY
363 if (is_buffer_mapped(req)) {
364 struct dma_controller *c = musb->dma_controller;
365 size_t request_size;
366
367 /* setup DMA, then program endpoint CSR */
368 request_size = min_t(size_t, request->length - request->actual,
369 musb_ep->dma->max_len);
370
371 use_dma = (request->dma != DMA_ADDR_INVALID);
372
373 /* MUSB_TXCSR_P_ISO is still set correctly */
374
375 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
376 {
377 if (request_size < musb_ep->packet_sz)
378 musb_ep->dma->desired_mode = 0;
379 else
380 musb_ep->dma->desired_mode = 1;
381
382 use_dma = use_dma && c->channel_program(
383 musb_ep->dma, musb_ep->packet_sz,
384 musb_ep->dma->desired_mode,
385 request->dma + request->actual, request_size);
386 if (use_dma) {
387 if (musb_ep->dma->desired_mode == 0) {
388 /*
389 * We must not clear the DMAMODE bit
390 * before the DMAENAB bit -- and the
391 * latter doesn't always get cleared
392 * before we get here...
393 */
394 csr &= ~(MUSB_TXCSR_AUTOSET
395 | MUSB_TXCSR_DMAENAB);
396 musb_writew(epio, MUSB_TXCSR, csr
397 | MUSB_TXCSR_P_WZC_BITS);
398 csr &= ~MUSB_TXCSR_DMAMODE;
399 csr |= (MUSB_TXCSR_DMAENAB |
400 MUSB_TXCSR_MODE);
401 /* against programming guide */
402 } else {
403 csr |= (MUSB_TXCSR_DMAENAB
404 | MUSB_TXCSR_DMAMODE
405 | MUSB_TXCSR_MODE);
406 if (!musb_ep->hb_mult)
407 csr |= MUSB_TXCSR_AUTOSET;
408 }
409 csr &= ~MUSB_TXCSR_P_UNDERRUN;
410
411 musb_writew(epio, MUSB_TXCSR, csr);
412 }
413 }
414
415 #elif defined(CONFIG_USB_TI_CPPI_DMA)
416 /* program endpoint CSR first, then setup DMA */
417 csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
418 csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE |
419 MUSB_TXCSR_MODE;
420 musb_writew(epio, MUSB_TXCSR,
421 (MUSB_TXCSR_P_WZC_BITS & ~MUSB_TXCSR_P_UNDERRUN)
422 | csr);
423
424 /* ensure writebuffer is empty */
425 csr = musb_readw(epio, MUSB_TXCSR);
426
427 /* NOTE host side sets DMAENAB later than this; both are
428 * OK since the transfer dma glue (between CPPI and Mentor
429 * fifos) just tells CPPI it could start. Data only moves
430 * to the USB TX fifo when both fifos are ready.
431 */
432
433 /* "mode" is irrelevant here; handle terminating ZLPs like
434 * PIO does, since the hardware RNDIS mode seems unreliable
435 * except for the last-packet-is-already-short case.
436 */
437 use_dma = use_dma && c->channel_program(
438 musb_ep->dma, musb_ep->packet_sz,
439 0,
440 request->dma + request->actual,
441 request_size);
442 if (!use_dma) {
443 c->channel_release(musb_ep->dma);
444 musb_ep->dma = NULL;
445 csr &= ~MUSB_TXCSR_DMAENAB;
446 musb_writew(epio, MUSB_TXCSR, csr);
447 /* invariant: prequest->buf is non-null */
448 }
449 #elif defined(CONFIG_USB_TUSB_OMAP_DMA)
450 use_dma = use_dma && c->channel_program(
451 musb_ep->dma, musb_ep->packet_sz,
452 request->zero,
453 request->dma + request->actual,
454 request_size);
455 #endif
456 }
457 #endif
458
459 if (!use_dma) {
460 /*
461 * Unmap the dma buffer back to cpu if dma channel
462 * programming fails
463 */
464 unmap_dma_buffer(req, musb);
465
466 musb_write_fifo(musb_ep->hw_ep, fifo_count,
467 (u8 *) (request->buf + request->actual));
468 request->actual += fifo_count;
469 csr |= MUSB_TXCSR_TXPKTRDY;
470 csr &= ~MUSB_TXCSR_P_UNDERRUN;
471 musb_writew(epio, MUSB_TXCSR, csr);
472 }
473
474 /* 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",
476 musb_ep->end_point.name, use_dma ? "dma" : "pio",
477 request->actual, request->length,
478 musb_readw(epio, MUSB_TXCSR),
479 fifo_count,
480 musb_readw(epio, MUSB_TXMAXP));
481 }
482
483 /*
484 * FIFO state update (e.g. data ready).
485 * Called from IRQ, with controller locked.
486 */
487 void musb_g_tx(struct musb *musb, u8 epnum)
488 {
489 u16 csr;
490 struct musb_request *req;
491 struct usb_request *request;
492 u8 __iomem *mbase = musb->mregs;
493 struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_in;
494 void __iomem *epio = musb->endpoints[epnum].regs;
495 struct dma_channel *dma;
496
497 musb_ep_select(mbase, epnum);
498 req = next_request(musb_ep);
499 request = &req->request;
500
501 csr = musb_readw(epio, MUSB_TXCSR);
502 dev_dbg(musb->controller, "<== %s, txcsr %04x\n", musb_ep->end_point.name, csr);
503
504 dma = is_dma_capable() ? musb_ep->dma : NULL;
505
506 /*
507 * REVISIT: for high bandwidth, MUSB_TXCSR_P_INCOMPTX
508 * probably rates reporting as a host error.
509 */
510 if (csr & MUSB_TXCSR_P_SENTSTALL) {
511 csr |= MUSB_TXCSR_P_WZC_BITS;
512 csr &= ~MUSB_TXCSR_P_SENTSTALL;
513 musb_writew(epio, MUSB_TXCSR, csr);
514 return;
515 }
516
517 if (csr & MUSB_TXCSR_P_UNDERRUN) {
518 /* We NAKed, no big deal... little reason to care. */
519 csr |= MUSB_TXCSR_P_WZC_BITS;
520 csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
521 musb_writew(epio, MUSB_TXCSR, csr);
522 dev_vdbg(musb->controller, "underrun on ep%d, req %p\n",
523 epnum, request);
524 }
525
526 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
527 /*
528 * SHOULD NOT HAPPEN... has with CPPI though, after
529 * changing SENDSTALL (and other cases); harmless?
530 */
531 dev_dbg(musb->controller, "%s dma still busy?\n", musb_ep->end_point.name);
532 return;
533 }
534
535 if (request) {
536 u8 is_dma = 0;
537
538 if (dma && (csr & MUSB_TXCSR_DMAENAB)) {
539 is_dma = 1;
540 csr |= MUSB_TXCSR_P_WZC_BITS;
541 csr &= ~(MUSB_TXCSR_DMAENAB | MUSB_TXCSR_P_UNDERRUN |
542 MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_AUTOSET);
543 musb_writew(epio, MUSB_TXCSR, csr);
544 /* Ensure writebuffer is empty. */
545 csr = musb_readw(epio, MUSB_TXCSR);
546 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);
549 }
550
551 /*
552 * First, maybe a terminating short packet. Some DMA
553 * engines might handle this by themselves.
554 */
555 if ((request->zero && request->length
556 && (request->length % musb_ep->packet_sz == 0)
557 && (request->actual == request->length))
558 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
559 || (is_dma && (!dma->desired_mode ||
560 (request->actual &
561 (musb_ep->packet_sz - 1))))
562 #endif
563 ) {
564 /*
565 * On DMA completion, FIFO may not be
566 * available yet...
567 */
568 if (csr & MUSB_TXCSR_TXPKTRDY)
569 return;
570
571 dev_dbg(musb->controller, "sending zero pkt\n");
572 musb_writew(epio, MUSB_TXCSR, MUSB_TXCSR_MODE
573 | MUSB_TXCSR_TXPKTRDY);
574 request->zero = 0;
575 }
576
577 if (request->actual == request->length) {
578 musb_g_giveback(musb_ep, request, 0);
579 req = musb_ep->desc ? next_request(musb_ep) : NULL;
580 if (!req) {
581 dev_dbg(musb->controller, "%s idle now\n",
582 musb_ep->end_point.name);
583 return;
584 }
585 }
586
587 txstate(musb, req);
588 }
589 }
590
591 /* ------------------------------------------------------------ */
592
593 #ifdef CONFIG_USB_INVENTRA_DMA
594
595 /* Peripheral rx (OUT) using Mentor DMA works as follows:
596 - Only mode 0 is used.
597
598 - Request is queued by the gadget class driver.
599 -> if queue was previously empty, rxstate()
600
601 - Host sends OUT token which causes an endpoint interrupt
602 /\ -> RxReady
603 | -> if request queued, call rxstate
604 | /\ -> setup DMA
605 | | -> DMA interrupt on completion
606 | | -> RxReady
607 | | -> stop DMA
608 | | -> ack the read
609 | | -> if data recd = max expected
610 | | by the request, or host
611 | | sent a short packet,
612 | | complete the request,
613 | | and start the next one.
614 | |_____________________________________|
615 | else just wait for the host
616 | to send the next OUT token.
617 |__________________________________________________|
618
619 * Non-Mentor DMA engines can of course work differently.
620 */
621
622 #endif
623
624 /*
625 * Context: controller locked, IRQs blocked, endpoint selected
626 */
627 static void rxstate(struct musb *musb, struct musb_request *req)
628 {
629 const u8 epnum = req->epnum;
630 struct usb_request *request = &req->request;
631 struct musb_ep *musb_ep;
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 struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
637
638 if (hw_ep->is_shared_fifo)
639 musb_ep = &hw_ep->ep_in;
640 else
641 musb_ep = &hw_ep->ep_out;
642
643 len = musb_ep->packet_sz;
644
645 /* We shouldn't get here while DMA is active, but we do... */
646 if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
647 dev_dbg(musb->controller, "DMA pending...\n");
648 return;
649 }
650
651 if (csr & MUSB_RXCSR_P_SENDSTALL) {
652 dev_dbg(musb->controller, "%s stalling, RXCSR %04x\n",
653 musb_ep->end_point.name, csr);
654 return;
655 }
656
657 if (is_cppi_enabled() && is_buffer_mapped(req)) {
658 struct dma_controller *c = musb->dma_controller;
659 struct dma_channel *channel = musb_ep->dma;
660
661 /* NOTE: CPPI won't actually stop advancing the DMA
662 * queue after short packet transfers, so this is almost
663 * always going to run as IRQ-per-packet DMA so that
664 * faults will be handled correctly.
665 */
666 if (c->channel_program(channel,
667 musb_ep->packet_sz,
668 !request->short_not_ok,
669 request->dma + request->actual,
670 request->length - request->actual)) {
671
672 /* make sure that if an rxpkt arrived after the irq,
673 * the cppi engine will be ready to take it as soon
674 * as DMA is enabled
675 */
676 csr &= ~(MUSB_RXCSR_AUTOCLEAR
677 | MUSB_RXCSR_DMAMODE);
678 csr |= MUSB_RXCSR_DMAENAB | MUSB_RXCSR_P_WZC_BITS;
679 musb_writew(epio, MUSB_RXCSR, csr);
680 return;
681 }
682 }
683
684 if (csr & MUSB_RXCSR_RXPKTRDY) {
685 len = musb_readw(epio, MUSB_RXCOUNT);
686 if (request->actual < request->length) {
687 #ifdef CONFIG_USB_INVENTRA_DMA
688 if (is_buffer_mapped(req)) {
689 struct dma_controller *c;
690 struct dma_channel *channel;
691 int use_dma = 0;
692
693 c = musb->dma_controller;
694 channel = musb_ep->dma;
695
696 /* We use DMA Req mode 0 in rx_csr, and DMA controller operates in
697 * mode 0 only. So we do not get endpoint interrupts due to DMA
698 * completion. We only get interrupts from DMA controller.
699 *
700 * We could operate in DMA mode 1 if we knew the size of the tranfer
701 * in advance. For mass storage class, request->length = what the host
702 * sends, so that'd work. But for pretty much everything else,
703 * request->length is routinely more than what the host sends. For
704 * most these gadgets, end of is signified either by a short packet,
705 * or filling the last byte of the buffer. (Sending extra data in
706 * that last pckate should trigger an overflow fault.) But in mode 1,
707 * we don't get DMA completion interrrupt for short packets.
708 *
709 * Theoretically, we could enable DMAReq irq (MUSB_RXCSR_DMAMODE = 1),
710 * to get endpoint interrupt on every DMA req, but that didn't seem
711 * to work reliably.
712 *
713 * REVISIT an updated g_file_storage can set req->short_not_ok, which
714 * then becomes usable as a runtime "use mode 1" hint...
715 */
716
717 csr |= MUSB_RXCSR_DMAENAB;
718 #ifdef USE_MODE1
719 csr |= MUSB_RXCSR_AUTOCLEAR;
720 /* csr |= MUSB_RXCSR_DMAMODE; */
721
722 /* this special sequence (enabling and then
723 * disabling MUSB_RXCSR_DMAMODE) is required
724 * to get DMAReq to activate
725 */
726 musb_writew(epio, MUSB_RXCSR,
727 csr | MUSB_RXCSR_DMAMODE);
728 #else
729 if (!musb_ep->hb_mult &&
730 musb_ep->hw_ep->rx_double_buffered)
731 csr |= MUSB_RXCSR_AUTOCLEAR;
732 #endif
733 musb_writew(epio, MUSB_RXCSR, csr);
734
735 if (request->actual < request->length) {
736 int transfer_size = 0;
737 #ifdef USE_MODE1
738 transfer_size = min(request->length - request->actual,
739 channel->max_len);
740 #else
741 transfer_size = min(request->length - request->actual,
742 (unsigned)len);
743 #endif
744 if (transfer_size <= musb_ep->packet_sz)
745 musb_ep->dma->desired_mode = 0;
746 else
747 musb_ep->dma->desired_mode = 1;
748
749 use_dma = c->channel_program(
750 channel,
751 musb_ep->packet_sz,
752 channel->desired_mode,
753 request->dma
754 + request->actual,
755 transfer_size);
756 }
757
758 if (use_dma)
759 return;
760 }
761 #elif defined(CONFIG_USB_UX500_DMA)
762 if ((is_buffer_mapped(req)) &&
763 (request->actual < request->length)) {
764
765 struct dma_controller *c;
766 struct dma_channel *channel;
767 int transfer_size = 0;
768
769 c = musb->dma_controller;
770 channel = musb_ep->dma;
771
772 /* In case first packet is short */
773 if (len < musb_ep->packet_sz)
774 transfer_size = len;
775 else if (request->short_not_ok)
776 transfer_size = min(request->length -
777 request->actual,
778 channel->max_len);
779 else
780 transfer_size = min(request->length -
781 request->actual,
782 (unsigned)len);
783
784 csr &= ~MUSB_RXCSR_DMAMODE;
785 csr |= (MUSB_RXCSR_DMAENAB |
786 MUSB_RXCSR_AUTOCLEAR);
787
788 musb_writew(epio, MUSB_RXCSR, csr);
789
790 if (transfer_size <= musb_ep->packet_sz) {
791 musb_ep->dma->desired_mode = 0;
792 } else {
793 musb_ep->dma->desired_mode = 1;
794 /* Mode must be set after DMAENAB */
795 csr |= MUSB_RXCSR_DMAMODE;
796 musb_writew(epio, MUSB_RXCSR, csr);
797 }
798
799 if (c->channel_program(channel,
800 musb_ep->packet_sz,
801 channel->desired_mode,
802 request->dma
803 + request->actual,
804 transfer_size))
805
806 return;
807 }
808 #endif /* Mentor's DMA */
809
810 fifo_count = request->length - request->actual;
811 dev_dbg(musb->controller, "%s OUT/RX pio fifo %d/%d, maxpacket %d\n",
812 musb_ep->end_point.name,
813 len, fifo_count,
814 musb_ep->packet_sz);
815
816 fifo_count = min_t(unsigned, len, fifo_count);
817
818 #ifdef CONFIG_USB_TUSB_OMAP_DMA
819 if (tusb_dma_omap() && is_buffer_mapped(req)) {
820 struct dma_controller *c = musb->dma_controller;
821 struct dma_channel *channel = musb_ep->dma;
822 u32 dma_addr = request->dma + request->actual;
823 int ret;
824
825 ret = c->channel_program(channel,
826 musb_ep->packet_sz,
827 channel->desired_mode,
828 dma_addr,
829 fifo_count);
830 if (ret)
831 return;
832 }
833 #endif
834 /*
835 * Unmap the dma buffer back to cpu if dma channel
836 * programming fails. This buffer is mapped if the
837 * channel allocation is successful
838 */
839 if (is_buffer_mapped(req)) {
840 unmap_dma_buffer(req, musb);
841
842 /*
843 * Clear DMAENAB and AUTOCLEAR for the
844 * PIO mode transfer
845 */
846 csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR);
847 musb_writew(epio, MUSB_RXCSR, csr);
848 }
849
850 musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *)
851 (request->buf + request->actual));
852 request->actual += fifo_count;
853
854 /* REVISIT if we left anything in the fifo, flush
855 * it and report -EOVERFLOW
856 */
857
858 /* ack the read! */
859 csr |= MUSB_RXCSR_P_WZC_BITS;
860 csr &= ~MUSB_RXCSR_RXPKTRDY;
861 musb_writew(epio, MUSB_RXCSR, csr);
862 }
863 }
864
865 /* reach the end or short packet detected */
866 if (request->actual == request->length || len < musb_ep->packet_sz)
867 musb_g_giveback(musb_ep, request, 0);
868 }
869
870 /*
871 * Data ready for a request; called from IRQ
872 */
873 void musb_g_rx(struct musb *musb, u8 epnum)
874 {
875 u16 csr;
876 struct musb_request *req;
877 struct usb_request *request;
878 void __iomem *mbase = musb->mregs;
879 struct musb_ep *musb_ep;
880 void __iomem *epio = musb->endpoints[epnum].regs;
881 struct dma_channel *dma;
882 struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
883
884 if (hw_ep->is_shared_fifo)
885 musb_ep = &hw_ep->ep_in;
886 else
887 musb_ep = &hw_ep->ep_out;
888
889 musb_ep_select(mbase, epnum);
890
891 req = next_request(musb_ep);
892 if (!req)
893 return;
894
895 request = &req->request;
896
897 csr = musb_readw(epio, MUSB_RXCSR);
898 dma = is_dma_capable() ? musb_ep->dma : NULL;
899
900 dev_dbg(musb->controller, "<== %s, rxcsr %04x%s %p\n", musb_ep->end_point.name,
901 csr, dma ? " (dma)" : "", request);
902
903 if (csr & MUSB_RXCSR_P_SENTSTALL) {
904 csr |= MUSB_RXCSR_P_WZC_BITS;
905 csr &= ~MUSB_RXCSR_P_SENTSTALL;
906 musb_writew(epio, MUSB_RXCSR, csr);
907 return;
908 }
909
910 if (csr & MUSB_RXCSR_P_OVERRUN) {
911 /* csr |= MUSB_RXCSR_P_WZC_BITS; */
912 csr &= ~MUSB_RXCSR_P_OVERRUN;
913 musb_writew(epio, MUSB_RXCSR, csr);
914
915 dev_dbg(musb->controller, "%s iso overrun on %p\n", musb_ep->name, request);
916 if (request->status == -EINPROGRESS)
917 request->status = -EOVERFLOW;
918 }
919 if (csr & MUSB_RXCSR_INCOMPRX) {
920 /* REVISIT not necessarily an error */
921 dev_dbg(musb->controller, "%s, incomprx\n", musb_ep->end_point.name);
922 }
923
924 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
925 /* "should not happen"; likely RXPKTRDY pending for DMA */
926 dev_dbg(musb->controller, "%s busy, csr %04x\n",
927 musb_ep->end_point.name, csr);
928 return;
929 }
930
931 if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
932 csr &= ~(MUSB_RXCSR_AUTOCLEAR
933 | MUSB_RXCSR_DMAENAB
934 | MUSB_RXCSR_DMAMODE);
935 musb_writew(epio, MUSB_RXCSR,
936 MUSB_RXCSR_P_WZC_BITS | csr);
937
938 request->actual += musb_ep->dma->actual_len;
939
940 dev_dbg(musb->controller, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n",
941 epnum, csr,
942 musb_readw(epio, MUSB_RXCSR),
943 musb_ep->dma->actual_len, request);
944
945 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
946 defined(CONFIG_USB_UX500_DMA)
947 /* Autoclear doesn't clear RxPktRdy for short packets */
948 if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered)
949 || (dma->actual_len
950 & (musb_ep->packet_sz - 1))) {
951 /* ack the read! */
952 csr &= ~MUSB_RXCSR_RXPKTRDY;
953 musb_writew(epio, MUSB_RXCSR, csr);
954 }
955
956 /* incomplete, and not short? wait for next IN packet */
957 if ((request->actual < request->length)
958 && (musb_ep->dma->actual_len
959 == musb_ep->packet_sz)) {
960 /* In double buffer case, continue to unload fifo if
961 * there is Rx packet in FIFO.
962 **/
963 csr = musb_readw(epio, MUSB_RXCSR);
964 if ((csr & MUSB_RXCSR_RXPKTRDY) &&
965 hw_ep->rx_double_buffered)
966 goto exit;
967 return;
968 }
969 #endif
970 musb_g_giveback(musb_ep, request, 0);
971
972 req = next_request(musb_ep);
973 if (!req)
974 return;
975 }
976 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
977 defined(CONFIG_USB_UX500_DMA)
978 exit:
979 #endif
980 /* Analyze request */
981 rxstate(musb, req);
982 }
983
984 /* ------------------------------------------------------------ */
985
986 static int musb_gadget_enable(struct usb_ep *ep,
987 const struct usb_endpoint_descriptor *desc)
988 {
989 unsigned long flags;
990 struct musb_ep *musb_ep;
991 struct musb_hw_ep *hw_ep;
992 void __iomem *regs;
993 struct musb *musb;
994 void __iomem *mbase;
995 u8 epnum;
996 u16 csr;
997 unsigned tmp;
998 int status = -EINVAL;
999
1000 if (!ep || !desc)
1001 return -EINVAL;
1002
1003 musb_ep = to_musb_ep(ep);
1004 hw_ep = musb_ep->hw_ep;
1005 regs = hw_ep->regs;
1006 musb = musb_ep->musb;
1007 mbase = musb->mregs;
1008 epnum = musb_ep->current_epnum;
1009
1010 spin_lock_irqsave(&musb->lock, flags);
1011
1012 if (musb_ep->desc) {
1013 status = -EBUSY;
1014 goto fail;
1015 }
1016 musb_ep->type = usb_endpoint_type(desc);
1017
1018 /* check direction and (later) maxpacket size against endpoint */
1019 if (usb_endpoint_num(desc) != epnum)
1020 goto fail;
1021
1022 /* REVISIT this rules out high bandwidth periodic transfers */
1023 tmp = usb_endpoint_maxp(desc);
1024 if (tmp & ~0x07ff) {
1025 int ok;
1026
1027 if (usb_endpoint_dir_in(desc))
1028 ok = musb->hb_iso_tx;
1029 else
1030 ok = musb->hb_iso_rx;
1031
1032 if (!ok) {
1033 dev_dbg(musb->controller, "no support for high bandwidth ISO\n");
1034 goto fail;
1035 }
1036 musb_ep->hb_mult = (tmp >> 11) & 3;
1037 } else {
1038 musb_ep->hb_mult = 0;
1039 }
1040
1041 musb_ep->packet_sz = tmp & 0x7ff;
1042 tmp = musb_ep->packet_sz * (musb_ep->hb_mult + 1);
1043
1044 /* enable the interrupts for the endpoint, set the endpoint
1045 * packet size (or fail), set the mode, clear the fifo
1046 */
1047 musb_ep_select(mbase, epnum);
1048 if (usb_endpoint_dir_in(desc)) {
1049 u16 int_txe = musb_readw(mbase, MUSB_INTRTXE);
1050
1051 if (hw_ep->is_shared_fifo)
1052 musb_ep->is_in = 1;
1053 if (!musb_ep->is_in)
1054 goto fail;
1055
1056 if (tmp > hw_ep->max_packet_sz_tx) {
1057 dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
1058 goto fail;
1059 }
1060
1061 int_txe |= (1 << epnum);
1062 musb_writew(mbase, MUSB_INTRTXE, int_txe);
1063
1064 /* REVISIT if can_bulk_split(), use by updating "tmp";
1065 * likewise high bandwidth periodic tx
1066 */
1067 /* Set TXMAXP with the FIFO size of the endpoint
1068 * to disable double buffering mode.
1069 */
1070 if (musb->double_buffer_not_ok)
1071 musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx);
1072 else
1073 musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz
1074 | (musb_ep->hb_mult << 11));
1075
1076 csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG;
1077 if (musb_readw(regs, MUSB_TXCSR)
1078 & MUSB_TXCSR_FIFONOTEMPTY)
1079 csr |= MUSB_TXCSR_FLUSHFIFO;
1080 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
1081 csr |= MUSB_TXCSR_P_ISO;
1082
1083 /* set twice in case of double buffering */
1084 musb_writew(regs, MUSB_TXCSR, csr);
1085 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1086 musb_writew(regs, MUSB_TXCSR, csr);
1087
1088 } else {
1089 u16 int_rxe = musb_readw(mbase, MUSB_INTRRXE);
1090
1091 if (hw_ep->is_shared_fifo)
1092 musb_ep->is_in = 0;
1093 if (musb_ep->is_in)
1094 goto fail;
1095
1096 if (tmp > hw_ep->max_packet_sz_rx) {
1097 dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
1098 goto fail;
1099 }
1100
1101 int_rxe |= (1 << epnum);
1102 musb_writew(mbase, MUSB_INTRRXE, int_rxe);
1103
1104 /* REVISIT if can_bulk_combine() use by updating "tmp"
1105 * likewise high bandwidth periodic rx
1106 */
1107 /* Set RXMAXP with the FIFO size of the endpoint
1108 * to disable double buffering mode.
1109 */
1110 if (musb->double_buffer_not_ok)
1111 musb_writew(regs, MUSB_RXMAXP, hw_ep->max_packet_sz_tx);
1112 else
1113 musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz
1114 | (musb_ep->hb_mult << 11));
1115
1116 /* force shared fifo to OUT-only mode */
1117 if (hw_ep->is_shared_fifo) {
1118 csr = musb_readw(regs, MUSB_TXCSR);
1119 csr &= ~(MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY);
1120 musb_writew(regs, MUSB_TXCSR, csr);
1121 }
1122
1123 csr = MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_CLRDATATOG;
1124 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
1125 csr |= MUSB_RXCSR_P_ISO;
1126 else if (musb_ep->type == USB_ENDPOINT_XFER_INT)
1127 csr |= MUSB_RXCSR_DISNYET;
1128
1129 /* set twice in case of double buffering */
1130 musb_writew(regs, MUSB_RXCSR, csr);
1131 musb_writew(regs, MUSB_RXCSR, csr);
1132 }
1133
1134 /* NOTE: all the I/O code _should_ work fine without DMA, in case
1135 * for some reason you run out of channels here.
1136 */
1137 if (is_dma_capable() && musb->dma_controller) {
1138 struct dma_controller *c = musb->dma_controller;
1139
1140 musb_ep->dma = c->channel_alloc(c, hw_ep,
1141 (desc->bEndpointAddress & USB_DIR_IN));
1142 } else
1143 musb_ep->dma = NULL;
1144
1145 musb_ep->desc = desc;
1146 musb_ep->busy = 0;
1147 musb_ep->wedged = 0;
1148 status = 0;
1149
1150 pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n",
1151 musb_driver_name, musb_ep->end_point.name,
1152 ({ char *s; switch (musb_ep->type) {
1153 case USB_ENDPOINT_XFER_BULK: s = "bulk"; break;
1154 case USB_ENDPOINT_XFER_INT: s = "int"; break;
1155 default: s = "iso"; break;
1156 }; s; }),
1157 musb_ep->is_in ? "IN" : "OUT",
1158 musb_ep->dma ? "dma, " : "",
1159 musb_ep->packet_sz);
1160
1161 schedule_work(&musb->irq_work);
1162
1163 fail:
1164 spin_unlock_irqrestore(&musb->lock, flags);
1165 return status;
1166 }
1167
1168 /*
1169 * Disable an endpoint flushing all requests queued.
1170 */
1171 static int musb_gadget_disable(struct usb_ep *ep)
1172 {
1173 unsigned long flags;
1174 struct musb *musb;
1175 u8 epnum;
1176 struct musb_ep *musb_ep;
1177 void __iomem *epio;
1178 int status = 0;
1179
1180 musb_ep = to_musb_ep(ep);
1181 musb = musb_ep->musb;
1182 epnum = musb_ep->current_epnum;
1183 epio = musb->endpoints[epnum].regs;
1184
1185 spin_lock_irqsave(&musb->lock, flags);
1186 musb_ep_select(musb->mregs, epnum);
1187
1188 /* zero the endpoint sizes */
1189 if (musb_ep->is_in) {
1190 u16 int_txe = musb_readw(musb->mregs, MUSB_INTRTXE);
1191 int_txe &= ~(1 << epnum);
1192 musb_writew(musb->mregs, MUSB_INTRTXE, int_txe);
1193 musb_writew(epio, MUSB_TXMAXP, 0);
1194 } else {
1195 u16 int_rxe = musb_readw(musb->mregs, MUSB_INTRRXE);
1196 int_rxe &= ~(1 << epnum);
1197 musb_writew(musb->mregs, MUSB_INTRRXE, int_rxe);
1198 musb_writew(epio, MUSB_RXMAXP, 0);
1199 }
1200
1201 musb_ep->desc = NULL;
1202
1203 /* abort all pending DMA and requests */
1204 nuke(musb_ep, -ESHUTDOWN);
1205
1206 schedule_work(&musb->irq_work);
1207
1208 spin_unlock_irqrestore(&(musb->lock), flags);
1209
1210 dev_dbg(musb->controller, "%s\n", musb_ep->end_point.name);
1211
1212 return status;
1213 }
1214
1215 /*
1216 * Allocate a request for an endpoint.
1217 * Reused by ep0 code.
1218 */
1219 struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1220 {
1221 struct musb_ep *musb_ep = to_musb_ep(ep);
1222 struct musb *musb = musb_ep->musb;
1223 struct musb_request *request = NULL;
1224
1225 request = kzalloc(sizeof *request, gfp_flags);
1226 if (!request) {
1227 dev_dbg(musb->controller, "not enough memory\n");
1228 return NULL;
1229 }
1230
1231 request->request.dma = DMA_ADDR_INVALID;
1232 request->epnum = musb_ep->current_epnum;
1233 request->ep = musb_ep;
1234
1235 return &request->request;
1236 }
1237
1238 /*
1239 * Free a request
1240 * Reused by ep0 code.
1241 */
1242 void musb_free_request(struct usb_ep *ep, struct usb_request *req)
1243 {
1244 kfree(to_musb_request(req));
1245 }
1246
1247 static LIST_HEAD(buffers);
1248
1249 struct free_record {
1250 struct list_head list;
1251 struct device *dev;
1252 unsigned bytes;
1253 dma_addr_t dma;
1254 };
1255
1256 /*
1257 * Context: controller locked, IRQs blocked.
1258 */
1259 void musb_ep_restart(struct musb *musb, struct musb_request *req)
1260 {
1261 dev_dbg(musb->controller, "<== %s request %p len %u on hw_ep%d\n",
1262 req->tx ? "TX/IN" : "RX/OUT",
1263 &req->request, req->request.length, req->epnum);
1264
1265 musb_ep_select(musb->mregs, req->epnum);
1266 if (req->tx)
1267 txstate(musb, req);
1268 else
1269 rxstate(musb, req);
1270 }
1271
1272 static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req,
1273 gfp_t gfp_flags)
1274 {
1275 struct musb_ep *musb_ep;
1276 struct musb_request *request;
1277 struct musb *musb;
1278 int status = 0;
1279 unsigned long lockflags;
1280
1281 if (!ep || !req)
1282 return -EINVAL;
1283 if (!req->buf)
1284 return -ENODATA;
1285
1286 musb_ep = to_musb_ep(ep);
1287 musb = musb_ep->musb;
1288
1289 request = to_musb_request(req);
1290 request->musb = musb;
1291
1292 if (request->ep != musb_ep)
1293 return -EINVAL;
1294
1295 dev_dbg(musb->controller, "<== to %s request=%p\n", ep->name, req);
1296
1297 /* request is mine now... */
1298 request->request.actual = 0;
1299 request->request.status = -EINPROGRESS;
1300 request->epnum = musb_ep->current_epnum;
1301 request->tx = musb_ep->is_in;
1302
1303 map_dma_buffer(request, musb, musb_ep);
1304
1305 spin_lock_irqsave(&musb->lock, lockflags);
1306
1307 /* don't queue if the ep is down */
1308 if (!musb_ep->desc) {
1309 dev_dbg(musb->controller, "req %p queued to %s while ep %s\n",
1310 req, ep->name, "disabled");
1311 status = -ESHUTDOWN;
1312 goto cleanup;
1313 }
1314
1315 /* add request to the list */
1316 list_add_tail(&request->list, &musb_ep->req_list);
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)
1320 musb_ep_restart(musb, request);
1321
1322 cleanup:
1323 spin_unlock_irqrestore(&musb->lock, lockflags);
1324 return status;
1325 }
1326
1327 static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request)
1328 {
1329 struct musb_ep *musb_ep = to_musb_ep(ep);
1330 struct musb_request *req = to_musb_request(request);
1331 struct musb_request *r;
1332 unsigned long flags;
1333 int status = 0;
1334 struct musb *musb = musb_ep->musb;
1335
1336 if (!ep || !request || to_musb_request(request)->ep != musb_ep)
1337 return -EINVAL;
1338
1339 spin_lock_irqsave(&musb->lock, flags);
1340
1341 list_for_each_entry(r, &musb_ep->req_list, list) {
1342 if (r == req)
1343 break;
1344 }
1345 if (r != req) {
1346 dev_dbg(musb->controller, "request %p not queued to %s\n", request, ep->name);
1347 status = -EINVAL;
1348 goto done;
1349 }
1350
1351 /* if the hardware doesn't have the request, easy ... */
1352 if (musb_ep->req_list.next != &req->list || musb_ep->busy)
1353 musb_g_giveback(musb_ep, request, -ECONNRESET);
1354
1355 /* ... else abort the dma transfer ... */
1356 else if (is_dma_capable() && musb_ep->dma) {
1357 struct dma_controller *c = musb->dma_controller;
1358
1359 musb_ep_select(musb->mregs, musb_ep->current_epnum);
1360 if (c->channel_abort)
1361 status = c->channel_abort(musb_ep->dma);
1362 else
1363 status = -EBUSY;
1364 if (status == 0)
1365 musb_g_giveback(musb_ep, request, -ECONNRESET);
1366 } else {
1367 /* NOTE: by sticking to easily tested hardware/driver states,
1368 * we leave counting of in-flight packets imprecise.
1369 */
1370 musb_g_giveback(musb_ep, request, -ECONNRESET);
1371 }
1372
1373 done:
1374 spin_unlock_irqrestore(&musb->lock, flags);
1375 return status;
1376 }
1377
1378 /*
1379 * Set or clear the halt bit of an endpoint. A halted enpoint won't tx/rx any
1380 * data but will queue requests.
1381 *
1382 * exported to ep0 code
1383 */
1384 static int musb_gadget_set_halt(struct usb_ep *ep, int value)
1385 {
1386 struct musb_ep *musb_ep = to_musb_ep(ep);
1387 u8 epnum = musb_ep->current_epnum;
1388 struct musb *musb = musb_ep->musb;
1389 void __iomem *epio = musb->endpoints[epnum].regs;
1390 void __iomem *mbase;
1391 unsigned long flags;
1392 u16 csr;
1393 struct musb_request *request;
1394 int status = 0;
1395
1396 if (!ep)
1397 return -EINVAL;
1398 mbase = musb->mregs;
1399
1400 spin_lock_irqsave(&musb->lock, flags);
1401
1402 if ((USB_ENDPOINT_XFER_ISOC == musb_ep->type)) {
1403 status = -EINVAL;
1404 goto done;
1405 }
1406
1407 musb_ep_select(mbase, epnum);
1408
1409 request = next_request(musb_ep);
1410 if (value) {
1411 if (request) {
1412 dev_dbg(musb->controller, "request in progress, cannot halt %s\n",
1413 ep->name);
1414 status = -EAGAIN;
1415 goto done;
1416 }
1417 /* Cannot portably stall with non-empty FIFO */
1418 if (musb_ep->is_in) {
1419 csr = musb_readw(epio, MUSB_TXCSR);
1420 if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
1421 dev_dbg(musb->controller, "FIFO busy, cannot halt %s\n", ep->name);
1422 status = -EAGAIN;
1423 goto done;
1424 }
1425 }
1426 } else
1427 musb_ep->wedged = 0;
1428
1429 /* set/clear the stall and toggle bits */
1430 dev_dbg(musb->controller, "%s: %s stall\n", ep->name, value ? "set" : "clear");
1431 if (musb_ep->is_in) {
1432 csr = musb_readw(epio, MUSB_TXCSR);
1433 csr |= MUSB_TXCSR_P_WZC_BITS
1434 | MUSB_TXCSR_CLRDATATOG;
1435 if (value)
1436 csr |= MUSB_TXCSR_P_SENDSTALL;
1437 else
1438 csr &= ~(MUSB_TXCSR_P_SENDSTALL
1439 | MUSB_TXCSR_P_SENTSTALL);
1440 csr &= ~MUSB_TXCSR_TXPKTRDY;
1441 musb_writew(epio, MUSB_TXCSR, csr);
1442 } else {
1443 csr = musb_readw(epio, MUSB_RXCSR);
1444 csr |= MUSB_RXCSR_P_WZC_BITS
1445 | MUSB_RXCSR_FLUSHFIFO
1446 | MUSB_RXCSR_CLRDATATOG;
1447 if (value)
1448 csr |= MUSB_RXCSR_P_SENDSTALL;
1449 else
1450 csr &= ~(MUSB_RXCSR_P_SENDSTALL
1451 | MUSB_RXCSR_P_SENTSTALL);
1452 musb_writew(epio, MUSB_RXCSR, csr);
1453 }
1454
1455 /* maybe start the first request in the queue */
1456 if (!musb_ep->busy && !value && request) {
1457 dev_dbg(musb->controller, "restarting the request\n");
1458 musb_ep_restart(musb, request);
1459 }
1460
1461 done:
1462 spin_unlock_irqrestore(&musb->lock, flags);
1463 return status;
1464 }
1465
1466 /*
1467 * Sets the halt feature with the clear requests ignored
1468 */
1469 static int musb_gadget_set_wedge(struct usb_ep *ep)
1470 {
1471 struct musb_ep *musb_ep = to_musb_ep(ep);
1472
1473 if (!ep)
1474 return -EINVAL;
1475
1476 musb_ep->wedged = 1;
1477
1478 return usb_ep_set_halt(ep);
1479 }
1480
1481 static int musb_gadget_fifo_status(struct usb_ep *ep)
1482 {
1483 struct musb_ep *musb_ep = to_musb_ep(ep);
1484 void __iomem *epio = musb_ep->hw_ep->regs;
1485 int retval = -EINVAL;
1486
1487 if (musb_ep->desc && !musb_ep->is_in) {
1488 struct musb *musb = musb_ep->musb;
1489 int epnum = musb_ep->current_epnum;
1490 void __iomem *mbase = musb->mregs;
1491 unsigned long flags;
1492
1493 spin_lock_irqsave(&musb->lock, flags);
1494
1495 musb_ep_select(mbase, epnum);
1496 /* FIXME return zero unless RXPKTRDY is set */
1497 retval = musb_readw(epio, MUSB_RXCOUNT);
1498
1499 spin_unlock_irqrestore(&musb->lock, flags);
1500 }
1501 return retval;
1502 }
1503
1504 static void musb_gadget_fifo_flush(struct usb_ep *ep)
1505 {
1506 struct musb_ep *musb_ep = to_musb_ep(ep);
1507 struct musb *musb = musb_ep->musb;
1508 u8 epnum = musb_ep->current_epnum;
1509 void __iomem *epio = musb->endpoints[epnum].regs;
1510 void __iomem *mbase;
1511 unsigned long flags;
1512 u16 csr, int_txe;
1513
1514 mbase = musb->mregs;
1515
1516 spin_lock_irqsave(&musb->lock, flags);
1517 musb_ep_select(mbase, (u8) epnum);
1518
1519 /* disable interrupts */
1520 int_txe = musb_readw(mbase, MUSB_INTRTXE);
1521 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
1522
1523 if (musb_ep->is_in) {
1524 csr = musb_readw(epio, MUSB_TXCSR);
1525 if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
1526 csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_P_WZC_BITS;
1527 /*
1528 * Setting both TXPKTRDY and FLUSHFIFO makes controller
1529 * to interrupt current FIFO loading, but not flushing
1530 * the already loaded ones.
1531 */
1532 csr &= ~MUSB_TXCSR_TXPKTRDY;
1533 musb_writew(epio, MUSB_TXCSR, csr);
1534 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1535 musb_writew(epio, MUSB_TXCSR, csr);
1536 }
1537 } else {
1538 csr = musb_readw(epio, MUSB_RXCSR);
1539 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_P_WZC_BITS;
1540 musb_writew(epio, MUSB_RXCSR, csr);
1541 musb_writew(epio, MUSB_RXCSR, csr);
1542 }
1543
1544 /* re-enable interrupt */
1545 musb_writew(mbase, MUSB_INTRTXE, int_txe);
1546 spin_unlock_irqrestore(&musb->lock, flags);
1547 }
1548
1549 static const struct usb_ep_ops musb_ep_ops = {
1550 .enable = musb_gadget_enable,
1551 .disable = musb_gadget_disable,
1552 .alloc_request = musb_alloc_request,
1553 .free_request = musb_free_request,
1554 .queue = musb_gadget_queue,
1555 .dequeue = musb_gadget_dequeue,
1556 .set_halt = musb_gadget_set_halt,
1557 .set_wedge = musb_gadget_set_wedge,
1558 .fifo_status = musb_gadget_fifo_status,
1559 .fifo_flush = musb_gadget_fifo_flush
1560 };
1561
1562 /* ----------------------------------------------------------------------- */
1563
1564 static int musb_gadget_get_frame(struct usb_gadget *gadget)
1565 {
1566 struct musb *musb = gadget_to_musb(gadget);
1567
1568 return (int)musb_readw(musb->mregs, MUSB_FRAME);
1569 }
1570
1571 static int musb_gadget_wakeup(struct usb_gadget *gadget)
1572 {
1573 struct musb *musb = gadget_to_musb(gadget);
1574 void __iomem *mregs = musb->mregs;
1575 unsigned long flags;
1576 int status = -EINVAL;
1577 u8 power, devctl;
1578 int retries;
1579
1580 spin_lock_irqsave(&musb->lock, flags);
1581
1582 switch (musb->xceiv->state) {
1583 case OTG_STATE_B_PERIPHERAL:
1584 /* NOTE: OTG state machine doesn't include B_SUSPENDED;
1585 * that's part of the standard usb 1.1 state machine, and
1586 * doesn't affect OTG transitions.
1587 */
1588 if (musb->may_wakeup && musb->is_suspended)
1589 break;
1590 goto done;
1591 case OTG_STATE_B_IDLE:
1592 /* Start SRP ... OTG not required. */
1593 devctl = musb_readb(mregs, MUSB_DEVCTL);
1594 dev_dbg(musb->controller, "Sending SRP: devctl: %02x\n", devctl);
1595 devctl |= MUSB_DEVCTL_SESSION;
1596 musb_writeb(mregs, MUSB_DEVCTL, devctl);
1597 devctl = musb_readb(mregs, MUSB_DEVCTL);
1598 retries = 100;
1599 while (!(devctl & MUSB_DEVCTL_SESSION)) {
1600 devctl = musb_readb(mregs, MUSB_DEVCTL);
1601 if (retries-- < 1)
1602 break;
1603 }
1604 retries = 10000;
1605 while (devctl & MUSB_DEVCTL_SESSION) {
1606 devctl = musb_readb(mregs, MUSB_DEVCTL);
1607 if (retries-- < 1)
1608 break;
1609 }
1610
1611 spin_unlock_irqrestore(&musb->lock, flags);
1612 otg_start_srp(musb->xceiv);
1613 spin_lock_irqsave(&musb->lock, flags);
1614
1615 /* Block idling for at least 1s */
1616 musb_platform_try_idle(musb,
1617 jiffies + msecs_to_jiffies(1 * HZ));
1618
1619 status = 0;
1620 goto done;
1621 default:
1622 dev_dbg(musb->controller, "Unhandled wake: %s\n",
1623 otg_state_string(musb->xceiv->state));
1624 goto done;
1625 }
1626
1627 status = 0;
1628
1629 power = musb_readb(mregs, MUSB_POWER);
1630 power |= MUSB_POWER_RESUME;
1631 musb_writeb(mregs, MUSB_POWER, power);
1632 dev_dbg(musb->controller, "issue wakeup\n");
1633
1634 /* FIXME do this next chunk in a timer callback, no udelay */
1635 mdelay(2);
1636
1637 power = musb_readb(mregs, MUSB_POWER);
1638 power &= ~MUSB_POWER_RESUME;
1639 musb_writeb(mregs, MUSB_POWER, power);
1640 done:
1641 spin_unlock_irqrestore(&musb->lock, flags);
1642 return status;
1643 }
1644
1645 static int
1646 musb_gadget_set_self_powered(struct usb_gadget *gadget, int is_selfpowered)
1647 {
1648 struct musb *musb = gadget_to_musb(gadget);
1649
1650 musb->is_self_powered = !!is_selfpowered;
1651 return 0;
1652 }
1653
1654 static void musb_pullup(struct musb *musb, int is_on)
1655 {
1656 u8 power;
1657
1658 power = musb_readb(musb->mregs, MUSB_POWER);
1659 if (is_on)
1660 power |= MUSB_POWER_SOFTCONN;
1661 else
1662 power &= ~MUSB_POWER_SOFTCONN;
1663
1664 /* FIXME if on, HdrcStart; if off, HdrcStop */
1665
1666 dev_dbg(musb->controller, "gadget D+ pullup %s\n",
1667 is_on ? "on" : "off");
1668 musb_writeb(musb->mregs, MUSB_POWER, power);
1669 }
1670
1671 #if 0
1672 static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active)
1673 {
1674 dev_dbg(musb->controller, "<= %s =>\n", __func__);
1675
1676 /*
1677 * FIXME iff driver's softconnect flag is set (as it is during probe,
1678 * though that can clear it), just musb_pullup().
1679 */
1680
1681 return -EINVAL;
1682 }
1683 #endif
1684
1685 static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1686 {
1687 struct musb *musb = gadget_to_musb(gadget);
1688
1689 if (!musb->xceiv->set_power)
1690 return -EOPNOTSUPP;
1691 return otg_set_power(musb->xceiv, mA);
1692 }
1693
1694 static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on)
1695 {
1696 struct musb *musb = gadget_to_musb(gadget);
1697 unsigned long flags;
1698
1699 is_on = !!is_on;
1700
1701 pm_runtime_get_sync(musb->controller);
1702
1703 /* NOTE: this assumes we are sensing vbus; we'd rather
1704 * not pullup unless the B-session is active.
1705 */
1706 spin_lock_irqsave(&musb->lock, flags);
1707 if (is_on != musb->softconnect) {
1708 musb->softconnect = is_on;
1709 musb_pullup(musb, is_on);
1710 }
1711 spin_unlock_irqrestore(&musb->lock, flags);
1712
1713 pm_runtime_put(musb->controller);
1714
1715 return 0;
1716 }
1717
1718 static int musb_gadget_start(struct usb_gadget *g,
1719 struct usb_gadget_driver *driver);
1720 static int musb_gadget_stop(struct usb_gadget *g,
1721 struct usb_gadget_driver *driver);
1722
1723 static const struct usb_gadget_ops musb_gadget_operations = {
1724 .get_frame = musb_gadget_get_frame,
1725 .wakeup = musb_gadget_wakeup,
1726 .set_selfpowered = musb_gadget_set_self_powered,
1727 /* .vbus_session = musb_gadget_vbus_session, */
1728 .vbus_draw = musb_gadget_vbus_draw,
1729 .pullup = musb_gadget_pullup,
1730 .udc_start = musb_gadget_start,
1731 .udc_stop = musb_gadget_stop,
1732 };
1733
1734 /* ----------------------------------------------------------------------- */
1735
1736 /* Registration */
1737
1738 /* Only this registration code "knows" the rule (from USB standards)
1739 * about there being only one external upstream port. It assumes
1740 * all peripheral ports are external...
1741 */
1742
1743 static void musb_gadget_release(struct device *dev)
1744 {
1745 /* kref_put(WHAT) */
1746 dev_dbg(dev, "%s\n", __func__);
1747 }
1748
1749
1750 static void __init
1751 init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in)
1752 {
1753 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1754
1755 memset(ep, 0, sizeof *ep);
1756
1757 ep->current_epnum = epnum;
1758 ep->musb = musb;
1759 ep->hw_ep = hw_ep;
1760 ep->is_in = is_in;
1761
1762 INIT_LIST_HEAD(&ep->req_list);
1763
1764 sprintf(ep->name, "ep%d%s", epnum,
1765 (!epnum || hw_ep->is_shared_fifo) ? "" : (
1766 is_in ? "in" : "out"));
1767 ep->end_point.name = ep->name;
1768 INIT_LIST_HEAD(&ep->end_point.ep_list);
1769 if (!epnum) {
1770 ep->end_point.maxpacket = 64;
1771 ep->end_point.ops = &musb_g_ep0_ops;
1772 musb->g.ep0 = &ep->end_point;
1773 } else {
1774 if (is_in)
1775 ep->end_point.maxpacket = hw_ep->max_packet_sz_tx;
1776 else
1777 ep->end_point.maxpacket = hw_ep->max_packet_sz_rx;
1778 ep->end_point.ops = &musb_ep_ops;
1779 list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list);
1780 }
1781 }
1782
1783 /*
1784 * Initialize the endpoints exposed to peripheral drivers, with backlinks
1785 * to the rest of the driver state.
1786 */
1787 static inline void __init musb_g_init_endpoints(struct musb *musb)
1788 {
1789 u8 epnum;
1790 struct musb_hw_ep *hw_ep;
1791 unsigned count = 0;
1792
1793 /* initialize endpoint list just once */
1794 INIT_LIST_HEAD(&(musb->g.ep_list));
1795
1796 for (epnum = 0, hw_ep = musb->endpoints;
1797 epnum < musb->nr_endpoints;
1798 epnum++, hw_ep++) {
1799 if (hw_ep->is_shared_fifo /* || !epnum */) {
1800 init_peripheral_ep(musb, &hw_ep->ep_in, epnum, 0);
1801 count++;
1802 } else {
1803 if (hw_ep->max_packet_sz_tx) {
1804 init_peripheral_ep(musb, &hw_ep->ep_in,
1805 epnum, 1);
1806 count++;
1807 }
1808 if (hw_ep->max_packet_sz_rx) {
1809 init_peripheral_ep(musb, &hw_ep->ep_out,
1810 epnum, 0);
1811 count++;
1812 }
1813 }
1814 }
1815 }
1816
1817 /* called once during driver setup to initialize and link into
1818 * the driver model; memory is zeroed.
1819 */
1820 int __init musb_gadget_setup(struct musb *musb)
1821 {
1822 int status;
1823
1824 /* REVISIT minor race: if (erroneously) setting up two
1825 * musb peripherals at the same time, only the bus lock
1826 * is probably held.
1827 */
1828
1829 musb->g.ops = &musb_gadget_operations;
1830 musb->g.is_dualspeed = 1;
1831 musb->g.speed = USB_SPEED_UNKNOWN;
1832
1833 /* this "gadget" abstracts/virtualizes the controller */
1834 dev_set_name(&musb->g.dev, "gadget");
1835 musb->g.dev.parent = musb->controller;
1836 musb->g.dev.dma_mask = musb->controller->dma_mask;
1837 musb->g.dev.release = musb_gadget_release;
1838 musb->g.name = musb_driver_name;
1839
1840 if (is_otg_enabled(musb))
1841 musb->g.is_otg = 1;
1842
1843 musb_g_init_endpoints(musb);
1844
1845 musb->is_active = 0;
1846 musb_platform_try_idle(musb, 0);
1847
1848 status = device_register(&musb->g.dev);
1849 if (status != 0) {
1850 put_device(&musb->g.dev);
1851 return status;
1852 }
1853 status = usb_add_gadget_udc(musb->controller, &musb->g);
1854 if (status)
1855 goto err;
1856
1857 return 0;
1858 err:
1859 musb->g.dev.parent = NULL;
1860 device_unregister(&musb->g.dev);
1861 return status;
1862 }
1863
1864 void musb_gadget_cleanup(struct musb *musb)
1865 {
1866 usb_del_gadget_udc(&musb->g);
1867 if (musb->g.dev.parent)
1868 device_unregister(&musb->g.dev);
1869 }
1870
1871 /*
1872 * Register the gadget driver. Used by gadget drivers when
1873 * registering themselves with the controller.
1874 *
1875 * -EINVAL something went wrong (not driver)
1876 * -EBUSY another gadget is already using the controller
1877 * -ENOMEM no memory to perform the operation
1878 *
1879 * @param driver the gadget driver
1880 * @return <0 if error, 0 if everything is fine
1881 */
1882 static int musb_gadget_start(struct usb_gadget *g,
1883 struct usb_gadget_driver *driver)
1884 {
1885 struct musb *musb = gadget_to_musb(g);
1886 unsigned long flags;
1887 int retval = -EINVAL;
1888
1889 if (driver->speed != USB_SPEED_HIGH)
1890 goto err0;
1891
1892 pm_runtime_get_sync(musb->controller);
1893
1894 dev_dbg(musb->controller, "registering driver %s\n", driver->function);
1895
1896 musb->softconnect = 0;
1897 musb->gadget_driver = driver;
1898
1899 spin_lock_irqsave(&musb->lock, flags);
1900 musb->is_active = 1;
1901
1902 otg_set_peripheral(musb->xceiv, &musb->g);
1903 musb->xceiv->state = OTG_STATE_B_IDLE;
1904
1905 /*
1906 * FIXME this ignores the softconnect flag. Drivers are
1907 * allowed hold the peripheral inactive until for example
1908 * userspace hooks up printer hardware or DSP codecs, so
1909 * hosts only see fully functional devices.
1910 */
1911
1912 if (!is_otg_enabled(musb))
1913 musb_start(musb);
1914
1915 spin_unlock_irqrestore(&musb->lock, flags);
1916
1917 if (is_otg_enabled(musb)) {
1918 struct usb_hcd *hcd = musb_to_hcd(musb);
1919
1920 dev_dbg(musb->controller, "OTG startup...\n");
1921
1922 /* REVISIT: funcall to other code, which also
1923 * handles power budgeting ... this way also
1924 * ensures HdrcStart is indirectly called.
1925 */
1926 retval = usb_add_hcd(musb_to_hcd(musb), -1, 0);
1927 if (retval < 0) {
1928 dev_dbg(musb->controller, "add_hcd failed, %d\n", retval);
1929 goto err2;
1930 }
1931
1932 if ((musb->xceiv->last_event == USB_EVENT_ID)
1933 && musb->xceiv->set_vbus)
1934 otg_set_vbus(musb->xceiv, 1);
1935
1936 hcd->self.uses_pio_for_control = 1;
1937 }
1938 if (musb->xceiv->last_event == USB_EVENT_NONE)
1939 pm_runtime_put(musb->controller);
1940
1941 return 0;
1942
1943 err2:
1944 if (!is_otg_enabled(musb))
1945 musb_stop(musb);
1946 err0:
1947 return retval;
1948 }
1949
1950 static void stop_activity(struct musb *musb, struct usb_gadget_driver *driver)
1951 {
1952 int i;
1953 struct musb_hw_ep *hw_ep;
1954
1955 /* don't disconnect if it's not connected */
1956 if (musb->g.speed == USB_SPEED_UNKNOWN)
1957 driver = NULL;
1958 else
1959 musb->g.speed = USB_SPEED_UNKNOWN;
1960
1961 /* deactivate the hardware */
1962 if (musb->softconnect) {
1963 musb->softconnect = 0;
1964 musb_pullup(musb, 0);
1965 }
1966 musb_stop(musb);
1967
1968 /* killing any outstanding requests will quiesce the driver;
1969 * then report disconnect
1970 */
1971 if (driver) {
1972 for (i = 0, hw_ep = musb->endpoints;
1973 i < musb->nr_endpoints;
1974 i++, hw_ep++) {
1975 musb_ep_select(musb->mregs, i);
1976 if (hw_ep->is_shared_fifo /* || !epnum */) {
1977 nuke(&hw_ep->ep_in, -ESHUTDOWN);
1978 } else {
1979 if (hw_ep->max_packet_sz_tx)
1980 nuke(&hw_ep->ep_in, -ESHUTDOWN);
1981 if (hw_ep->max_packet_sz_rx)
1982 nuke(&hw_ep->ep_out, -ESHUTDOWN);
1983 }
1984 }
1985
1986 spin_unlock(&musb->lock);
1987 driver->disconnect(&musb->g);
1988 spin_lock(&musb->lock);
1989 }
1990 }
1991
1992 /*
1993 * Unregister the gadget driver. Used by gadget drivers when
1994 * unregistering themselves from the controller.
1995 *
1996 * @param driver the gadget driver to unregister
1997 */
1998 static int musb_gadget_stop(struct usb_gadget *g,
1999 struct usb_gadget_driver *driver)
2000 {
2001 struct musb *musb = gadget_to_musb(g);
2002 unsigned long flags;
2003
2004 if (musb->xceiv->last_event == USB_EVENT_NONE)
2005 pm_runtime_get_sync(musb->controller);
2006
2007 /*
2008 * REVISIT always use otg_set_peripheral() here too;
2009 * this needs to shut down the OTG engine.
2010 */
2011
2012 spin_lock_irqsave(&musb->lock, flags);
2013
2014 musb_hnp_stop(musb);
2015
2016 (void) musb_gadget_vbus_draw(&musb->g, 0);
2017
2018 musb->xceiv->state = OTG_STATE_UNDEFINED;
2019 stop_activity(musb, driver);
2020 otg_set_peripheral(musb->xceiv, NULL);
2021
2022 dev_dbg(musb->controller, "unregistering driver %s\n", driver->function);
2023
2024 musb->is_active = 0;
2025 musb_platform_try_idle(musb, 0);
2026 spin_unlock_irqrestore(&musb->lock, flags);
2027
2028 if (is_otg_enabled(musb)) {
2029 usb_remove_hcd(musb_to_hcd(musb));
2030 /* FIXME we need to be able to register another
2031 * gadget driver here and have everything work;
2032 * that currently misbehaves.
2033 */
2034 }
2035
2036 if (!is_otg_enabled(musb))
2037 musb_stop(musb);
2038
2039 pm_runtime_put(musb->controller);
2040
2041 return 0;
2042 }
2043
2044 /* ----------------------------------------------------------------------- */
2045
2046 /* lifecycle operations called through plat_uds.c */
2047
2048 void musb_g_resume(struct musb *musb)
2049 {
2050 musb->is_suspended = 0;
2051 switch (musb->xceiv->state) {
2052 case OTG_STATE_B_IDLE:
2053 break;
2054 case OTG_STATE_B_WAIT_ACON:
2055 case OTG_STATE_B_PERIPHERAL:
2056 musb->is_active = 1;
2057 if (musb->gadget_driver && musb->gadget_driver->resume) {
2058 spin_unlock(&musb->lock);
2059 musb->gadget_driver->resume(&musb->g);
2060 spin_lock(&musb->lock);
2061 }
2062 break;
2063 default:
2064 WARNING("unhandled RESUME transition (%s)\n",
2065 otg_state_string(musb->xceiv->state));
2066 }
2067 }
2068
2069 /* called when SOF packets stop for 3+ msec */
2070 void musb_g_suspend(struct musb *musb)
2071 {
2072 u8 devctl;
2073
2074 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2075 dev_dbg(musb->controller, "devctl %02x\n", devctl);
2076
2077 switch (musb->xceiv->state) {
2078 case OTG_STATE_B_IDLE:
2079 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2080 musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
2081 break;
2082 case OTG_STATE_B_PERIPHERAL:
2083 musb->is_suspended = 1;
2084 if (musb->gadget_driver && musb->gadget_driver->suspend) {
2085 spin_unlock(&musb->lock);
2086 musb->gadget_driver->suspend(&musb->g);
2087 spin_lock(&musb->lock);
2088 }
2089 break;
2090 default:
2091 /* REVISIT if B_HOST, clear DEVCTL.HOSTREQ;
2092 * A_PERIPHERAL may need care too
2093 */
2094 WARNING("unhandled SUSPEND transition (%s)\n",
2095 otg_state_string(musb->xceiv->state));
2096 }
2097 }
2098
2099 /* Called during SRP */
2100 void musb_g_wakeup(struct musb *musb)
2101 {
2102 musb_gadget_wakeup(&musb->g);
2103 }
2104
2105 /* called when VBUS drops below session threshold, and in other cases */
2106 void musb_g_disconnect(struct musb *musb)
2107 {
2108 void __iomem *mregs = musb->mregs;
2109 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
2110
2111 dev_dbg(musb->controller, "devctl %02x\n", devctl);
2112
2113 /* clear HR */
2114 musb_writeb(mregs, MUSB_DEVCTL, devctl & MUSB_DEVCTL_SESSION);
2115
2116 /* don't draw vbus until new b-default session */
2117 (void) musb_gadget_vbus_draw(&musb->g, 0);
2118
2119 musb->g.speed = USB_SPEED_UNKNOWN;
2120 if (musb->gadget_driver && musb->gadget_driver->disconnect) {
2121 spin_unlock(&musb->lock);
2122 musb->gadget_driver->disconnect(&musb->g);
2123 spin_lock(&musb->lock);
2124 }
2125
2126 switch (musb->xceiv->state) {
2127 default:
2128 dev_dbg(musb->controller, "Unhandled disconnect %s, setting a_idle\n",
2129 otg_state_string(musb->xceiv->state));
2130 musb->xceiv->state = OTG_STATE_A_IDLE;
2131 MUSB_HST_MODE(musb);
2132 break;
2133 case OTG_STATE_A_PERIPHERAL:
2134 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2135 MUSB_HST_MODE(musb);
2136 break;
2137 case OTG_STATE_B_WAIT_ACON:
2138 case OTG_STATE_B_HOST:
2139 case OTG_STATE_B_PERIPHERAL:
2140 case OTG_STATE_B_IDLE:
2141 musb->xceiv->state = OTG_STATE_B_IDLE;
2142 break;
2143 case OTG_STATE_B_SRP_INIT:
2144 break;
2145 }
2146
2147 musb->is_active = 0;
2148 }
2149
2150 void musb_g_reset(struct musb *musb)
2151 __releases(musb->lock)
2152 __acquires(musb->lock)
2153 {
2154 void __iomem *mbase = musb->mregs;
2155 u8 devctl = musb_readb(mbase, MUSB_DEVCTL);
2156 u8 power;
2157
2158 dev_dbg(musb->controller, "<== %s addr=%x driver '%s'\n",
2159 (devctl & MUSB_DEVCTL_BDEVICE)
2160 ? "B-Device" : "A-Device",
2161 musb_readb(mbase, MUSB_FADDR),
2162 musb->gadget_driver
2163 ? musb->gadget_driver->driver.name
2164 : NULL
2165 );
2166
2167 /* report disconnect, if we didn't already (flushing EP state) */
2168 if (musb->g.speed != USB_SPEED_UNKNOWN)
2169 musb_g_disconnect(musb);
2170
2171 /* clear HR */
2172 else if (devctl & MUSB_DEVCTL_HR)
2173 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
2174
2175
2176 /* what speed did we negotiate? */
2177 power = musb_readb(mbase, MUSB_POWER);
2178 musb->g.speed = (power & MUSB_POWER_HSMODE)
2179 ? USB_SPEED_HIGH : USB_SPEED_FULL;
2180
2181 /* start in USB_STATE_DEFAULT */
2182 musb->is_active = 1;
2183 musb->is_suspended = 0;
2184 MUSB_DEV_MODE(musb);
2185 musb->address = 0;
2186 musb->ep0_state = MUSB_EP0_STAGE_SETUP;
2187
2188 musb->may_wakeup = 0;
2189 musb->g.b_hnp_enable = 0;
2190 musb->g.a_alt_hnp_support = 0;
2191 musb->g.a_hnp_support = 0;
2192
2193 /* Normal reset, as B-Device;
2194 * or else after HNP, as A-Device
2195 */
2196 if (devctl & MUSB_DEVCTL_BDEVICE) {
2197 musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
2198 musb->g.is_a_peripheral = 0;
2199 } else if (is_otg_enabled(musb)) {
2200 musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
2201 musb->g.is_a_peripheral = 1;
2202 } else
2203 WARN_ON(1);
2204
2205 /* start with default limits on VBUS power draw */
2206 (void) musb_gadget_vbus_draw(&musb->g,
2207 is_otg_enabled(musb) ? 8 : 100);
2208 }
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