1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * MUSB OTG driver peripheral support
4 *
5 * Copyright 2005 Mentor Graphics Corporation
6 * Copyright (C) 2005-2006 by Texas Instruments
7 * Copyright (C) 2006-2007 Nokia Corporation
8 * Copyright (C) 2009 MontaVista Software, Inc. <source@mvista.com>
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/list.h>
13 #include <linux/timer.h>
14 #include <linux/module.h>
15 #include <linux/smp.h>
16 #include <linux/spinlock.h>
17 #include <linux/delay.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/slab.h>
20
21 #include "musb_core.h"
22 #include "musb_trace.h"
23
24
25 /* ----------------------------------------------------------------------- */
26
27 #define is_buffer_mapped(req) (is_dma_capable() && \
28 (req->map_state != UN_MAPPED))
29
30 /* Maps the buffer to dma */
31
map_dma_buffer(struct musb_request * request,struct musb * musb,struct musb_ep * musb_ep)32 static inline void map_dma_buffer(struct musb_request *request,
33 struct musb *musb, struct musb_ep *musb_ep)
34 {
35 int compatible = true;
36 struct dma_controller *dma = musb->dma_controller;
37
38 request->map_state = UN_MAPPED;
39
40 if (!is_dma_capable() || !musb_ep->dma)
41 return;
42
43 /* Check if DMA engine can handle this request.
44 * DMA code must reject the USB request explicitly.
45 * Default behaviour is to map the request.
46 */
47 if (dma->is_compatible)
48 compatible = dma->is_compatible(musb_ep->dma,
49 musb_ep->packet_sz, request->request.buf,
50 request->request.length);
51 if (!compatible)
52 return;
53
54 if (request->request.dma == DMA_ADDR_INVALID) {
55 dma_addr_t dma_addr;
56 int ret;
57
58 dma_addr = dma_map_single(
59 musb->controller,
60 request->request.buf,
61 request->request.length,
62 request->tx
63 ? DMA_TO_DEVICE
64 : DMA_FROM_DEVICE);
65 ret = dma_mapping_error(musb->controller, dma_addr);
66 if (ret)
67 return;
68
69 request->request.dma = dma_addr;
70 request->map_state = MUSB_MAPPED;
71 } else {
72 dma_sync_single_for_device(musb->controller,
73 request->request.dma,
74 request->request.length,
75 request->tx
76 ? DMA_TO_DEVICE
77 : DMA_FROM_DEVICE);
78 request->map_state = PRE_MAPPED;
79 }
80 }
81
82 /* Unmap the buffer from dma and maps it back to cpu */
unmap_dma_buffer(struct musb_request * request,struct musb * musb)83 static inline void unmap_dma_buffer(struct musb_request *request,
84 struct musb *musb)
85 {
86 struct musb_ep *musb_ep = request->ep;
87
88 if (!is_buffer_mapped(request) || !musb_ep->dma)
89 return;
90
91 if (request->request.dma == DMA_ADDR_INVALID) {
92 dev_vdbg(musb->controller,
93 "not unmapping a never mapped buffer\n");
94 return;
95 }
96 if (request->map_state == MUSB_MAPPED) {
97 dma_unmap_single(musb->controller,
98 request->request.dma,
99 request->request.length,
100 request->tx
101 ? DMA_TO_DEVICE
102 : DMA_FROM_DEVICE);
103 request->request.dma = DMA_ADDR_INVALID;
104 } else { /* PRE_MAPPED */
105 dma_sync_single_for_cpu(musb->controller,
106 request->request.dma,
107 request->request.length,
108 request->tx
109 ? DMA_TO_DEVICE
110 : DMA_FROM_DEVICE);
111 }
112 request->map_state = UN_MAPPED;
113 }
114
115 /*
116 * Immediately complete a request.
117 *
118 * @param request the request to complete
119 * @param status the status to complete the request with
120 * Context: controller locked, IRQs blocked.
121 */
musb_g_giveback(struct musb_ep * ep,struct usb_request * request,int status)122 void musb_g_giveback(
123 struct musb_ep *ep,
124 struct usb_request *request,
125 int status)
126 __releases(ep->musb->lock)
127 __acquires(ep->musb->lock)
128 {
129 struct musb_request *req;
130 struct musb *musb;
131 int busy = ep->busy;
132
133 req = to_musb_request(request);
134
135 list_del(&req->list);
136 if (req->request.status == -EINPROGRESS)
137 req->request.status = status;
138 musb = req->musb;
139
140 ep->busy = 1;
141 spin_unlock(&musb->lock);
142
143 if (!dma_mapping_error(&musb->g.dev, request->dma))
144 unmap_dma_buffer(req, musb);
145
146 trace_musb_req_gb(req);
147 usb_gadget_giveback_request(&req->ep->end_point, &req->request);
148 spin_lock(&musb->lock);
149 ep->busy = busy;
150 }
151
152 /* ----------------------------------------------------------------------- */
153
154 /*
155 * Abort requests queued to an endpoint using the status. Synchronous.
156 * caller locked controller and blocked irqs, and selected this ep.
157 */
nuke(struct musb_ep * ep,const int status)158 static void nuke(struct musb_ep *ep, const int status)
159 {
160 struct musb *musb = ep->musb;
161 struct musb_request *req = NULL;
162 void __iomem *epio = ep->musb->endpoints[ep->current_epnum].regs;
163
164 ep->busy = 1;
165
166 if (is_dma_capable() && ep->dma) {
167 struct dma_controller *c = ep->musb->dma_controller;
168 int value;
169
170 if (ep->is_in) {
171 /*
172 * The programming guide says that we must not clear
173 * the DMAMODE bit before DMAENAB, so we only
174 * clear it in the second write...
175 */
176 musb_writew(epio, MUSB_TXCSR,
177 MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO);
178 musb_writew(epio, MUSB_TXCSR,
179 0 | MUSB_TXCSR_FLUSHFIFO);
180 } else {
181 musb_writew(epio, MUSB_RXCSR,
182 0 | MUSB_RXCSR_FLUSHFIFO);
183 musb_writew(epio, MUSB_RXCSR,
184 0 | MUSB_RXCSR_FLUSHFIFO);
185 }
186
187 value = c->channel_abort(ep->dma);
188 musb_dbg(musb, "%s: abort DMA --> %d", ep->name, value);
189 c->channel_release(ep->dma);
190 ep->dma = NULL;
191 }
192
193 while (!list_empty(&ep->req_list)) {
194 req = list_first_entry(&ep->req_list, struct musb_request, list);
195 musb_g_giveback(ep, &req->request, status);
196 }
197 }
198
199 /* ----------------------------------------------------------------------- */
200
201 /* Data transfers - pure PIO, pure DMA, or mixed mode */
202
203 /*
204 * This assumes the separate CPPI engine is responding to DMA requests
205 * from the usb core ... sequenced a bit differently from mentor dma.
206 */
207
max_ep_writesize(struct musb * musb,struct musb_ep * ep)208 static inline int max_ep_writesize(struct musb *musb, struct musb_ep *ep)
209 {
210 if (can_bulk_split(musb, ep->type))
211 return ep->hw_ep->max_packet_sz_tx;
212 else
213 return ep->packet_sz;
214 }
215
216 /*
217 * An endpoint is transmitting data. This can be called either from
218 * the IRQ routine or from ep.queue() to kickstart a request on an
219 * endpoint.
220 *
221 * Context: controller locked, IRQs blocked, endpoint selected
222 */
txstate(struct musb * musb,struct musb_request * req)223 static void txstate(struct musb *musb, struct musb_request *req)
224 {
225 u8 epnum = req->epnum;
226 struct musb_ep *musb_ep;
227 void __iomem *epio = musb->endpoints[epnum].regs;
228 struct usb_request *request;
229 u16 fifo_count = 0, csr;
230 int use_dma = 0;
231
232 musb_ep = req->ep;
233
234 /* Check if EP is disabled */
235 if (!musb_ep->desc) {
236 musb_dbg(musb, "ep:%s disabled - ignore request",
237 musb_ep->end_point.name);
238 return;
239 }
240
241 /* we shouldn't get here while DMA is active ... but we do ... */
242 if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
243 musb_dbg(musb, "dma pending...");
244 return;
245 }
246
247 /* read TXCSR before */
248 csr = musb_readw(epio, MUSB_TXCSR);
249
250 request = &req->request;
251 fifo_count = min(max_ep_writesize(musb, musb_ep),
252 (int)(request->length - request->actual));
253
254 if (csr & MUSB_TXCSR_TXPKTRDY) {
255 musb_dbg(musb, "%s old packet still ready , txcsr %03x",
256 musb_ep->end_point.name, csr);
257 return;
258 }
259
260 if (csr & MUSB_TXCSR_P_SENDSTALL) {
261 musb_dbg(musb, "%s stalling, txcsr %03x",
262 musb_ep->end_point.name, csr);
263 return;
264 }
265
266 musb_dbg(musb, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x",
267 epnum, musb_ep->packet_sz, fifo_count,
268 csr);
269
270 #ifndef CONFIG_MUSB_PIO_ONLY
271 if (is_buffer_mapped(req)) {
272 struct dma_controller *c = musb->dma_controller;
273 size_t request_size;
274
275 /* setup DMA, then program endpoint CSR */
276 request_size = min_t(size_t, request->length - request->actual,
277 musb_ep->dma->max_len);
278
279 use_dma = (request->dma != DMA_ADDR_INVALID && request_size);
280
281 /* MUSB_TXCSR_P_ISO is still set correctly */
282
283 if (musb_dma_inventra(musb) || musb_dma_ux500(musb)) {
284 if (request_size < musb_ep->packet_sz)
285 musb_ep->dma->desired_mode = 0;
286 else
287 musb_ep->dma->desired_mode = 1;
288
289 use_dma = use_dma && c->channel_program(
290 musb_ep->dma, musb_ep->packet_sz,
291 musb_ep->dma->desired_mode,
292 request->dma + request->actual, request_size);
293 if (use_dma) {
294 if (musb_ep->dma->desired_mode == 0) {
295 /*
296 * We must not clear the DMAMODE bit
297 * before the DMAENAB bit -- and the
298 * latter doesn't always get cleared
299 * before we get here...
300 */
301 csr &= ~(MUSB_TXCSR_AUTOSET
302 | MUSB_TXCSR_DMAENAB);
303 musb_writew(epio, MUSB_TXCSR, csr
304 | MUSB_TXCSR_P_WZC_BITS);
305 csr &= ~MUSB_TXCSR_DMAMODE;
306 csr |= (MUSB_TXCSR_DMAENAB |
307 MUSB_TXCSR_MODE);
308 /* against programming guide */
309 } else {
310 csr |= (MUSB_TXCSR_DMAENAB
311 | MUSB_TXCSR_DMAMODE
312 | MUSB_TXCSR_MODE);
313 /*
314 * Enable Autoset according to table
315 * below
316 * bulk_split hb_mult Autoset_Enable
317 * 0 0 Yes(Normal)
318 * 0 >0 No(High BW ISO)
319 * 1 0 Yes(HS bulk)
320 * 1 >0 Yes(FS bulk)
321 */
322 if (!musb_ep->hb_mult ||
323 can_bulk_split(musb,
324 musb_ep->type))
325 csr |= MUSB_TXCSR_AUTOSET;
326 }
327 csr &= ~MUSB_TXCSR_P_UNDERRUN;
328
329 musb_writew(epio, MUSB_TXCSR, csr);
330 }
331 }
332
333 if (is_cppi_enabled(musb)) {
334 /* program endpoint CSR first, then setup DMA */
335 csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
336 csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE |
337 MUSB_TXCSR_MODE;
338 musb_writew(epio, MUSB_TXCSR, (MUSB_TXCSR_P_WZC_BITS &
339 ~MUSB_TXCSR_P_UNDERRUN) | csr);
340
341 /* ensure writebuffer is empty */
342 csr = musb_readw(epio, MUSB_TXCSR);
343
344 /*
345 * NOTE host side sets DMAENAB later than this; both are
346 * OK since the transfer dma glue (between CPPI and
347 * Mentor fifos) just tells CPPI it could start. Data
348 * only moves to the USB TX fifo when both fifos are
349 * ready.
350 */
351 /*
352 * "mode" is irrelevant here; handle terminating ZLPs
353 * like PIO does, since the hardware RNDIS mode seems
354 * unreliable except for the
355 * last-packet-is-already-short case.
356 */
357 use_dma = use_dma && c->channel_program(
358 musb_ep->dma, musb_ep->packet_sz,
359 0,
360 request->dma + request->actual,
361 request_size);
362 if (!use_dma) {
363 c->channel_release(musb_ep->dma);
364 musb_ep->dma = NULL;
365 csr &= ~MUSB_TXCSR_DMAENAB;
366 musb_writew(epio, MUSB_TXCSR, csr);
367 /* invariant: prequest->buf is non-null */
368 }
369 } else if (tusb_dma_omap(musb))
370 use_dma = use_dma && c->channel_program(
371 musb_ep->dma, musb_ep->packet_sz,
372 request->zero,
373 request->dma + request->actual,
374 request_size);
375 }
376 #endif
377
378 if (!use_dma) {
379 /*
380 * Unmap the dma buffer back to cpu if dma channel
381 * programming fails
382 */
383 unmap_dma_buffer(req, musb);
384
385 musb_write_fifo(musb_ep->hw_ep, fifo_count,
386 (u8 *) (request->buf + request->actual));
387 request->actual += fifo_count;
388 csr |= MUSB_TXCSR_TXPKTRDY;
389 csr &= ~MUSB_TXCSR_P_UNDERRUN;
390 musb_writew(epio, MUSB_TXCSR, csr);
391 }
392
393 /* host may already have the data when this message shows... */
394 musb_dbg(musb, "%s TX/IN %s len %d/%d, txcsr %04x, fifo %d/%d",
395 musb_ep->end_point.name, use_dma ? "dma" : "pio",
396 request->actual, request->length,
397 musb_readw(epio, MUSB_TXCSR),
398 fifo_count,
399 musb_readw(epio, MUSB_TXMAXP));
400 }
401
402 /*
403 * FIFO state update (e.g. data ready).
404 * Called from IRQ, with controller locked.
405 */
musb_g_tx(struct musb * musb,u8 epnum)406 void musb_g_tx(struct musb *musb, u8 epnum)
407 {
408 u16 csr;
409 struct musb_request *req;
410 struct usb_request *request;
411 u8 __iomem *mbase = musb->mregs;
412 struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_in;
413 void __iomem *epio = musb->endpoints[epnum].regs;
414 struct dma_channel *dma;
415
416 musb_ep_select(mbase, epnum);
417 req = next_request(musb_ep);
418 request = &req->request;
419
420 csr = musb_readw(epio, MUSB_TXCSR);
421 musb_dbg(musb, "<== %s, txcsr %04x", musb_ep->end_point.name, csr);
422
423 dma = is_dma_capable() ? musb_ep->dma : NULL;
424
425 /*
426 * REVISIT: for high bandwidth, MUSB_TXCSR_P_INCOMPTX
427 * probably rates reporting as a host error.
428 */
429 if (csr & MUSB_TXCSR_P_SENTSTALL) {
430 csr |= MUSB_TXCSR_P_WZC_BITS;
431 csr &= ~MUSB_TXCSR_P_SENTSTALL;
432 musb_writew(epio, MUSB_TXCSR, csr);
433 return;
434 }
435
436 if (csr & MUSB_TXCSR_P_UNDERRUN) {
437 /* We NAKed, no big deal... little reason to care. */
438 csr |= MUSB_TXCSR_P_WZC_BITS;
439 csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
440 musb_writew(epio, MUSB_TXCSR, csr);
441 dev_vdbg(musb->controller, "underrun on ep%d, req %p\n",
442 epnum, request);
443 }
444
445 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
446 /*
447 * SHOULD NOT HAPPEN... has with CPPI though, after
448 * changing SENDSTALL (and other cases); harmless?
449 */
450 musb_dbg(musb, "%s dma still busy?", musb_ep->end_point.name);
451 return;
452 }
453
454 if (req) {
455
456 trace_musb_req_tx(req);
457
458 if (dma && (csr & MUSB_TXCSR_DMAENAB)) {
459 csr |= MUSB_TXCSR_P_WZC_BITS;
460 csr &= ~(MUSB_TXCSR_DMAENAB | MUSB_TXCSR_P_UNDERRUN |
461 MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_AUTOSET);
462 musb_writew(epio, MUSB_TXCSR, csr);
463 /* Ensure writebuffer is empty. */
464 csr = musb_readw(epio, MUSB_TXCSR);
465 request->actual += musb_ep->dma->actual_len;
466 musb_dbg(musb, "TXCSR%d %04x, DMA off, len %zu, req %p",
467 epnum, csr, musb_ep->dma->actual_len, request);
468 }
469
470 /*
471 * First, maybe a terminating short packet. Some DMA
472 * engines might handle this by themselves.
473 */
474 if ((request->zero && request->length)
475 && (request->length % musb_ep->packet_sz == 0)
476 && (request->actual == request->length)) {
477
478 /*
479 * On DMA completion, FIFO may not be
480 * available yet...
481 */
482 if (csr & MUSB_TXCSR_TXPKTRDY)
483 return;
484
485 musb_writew(epio, MUSB_TXCSR, MUSB_TXCSR_MODE
486 | MUSB_TXCSR_TXPKTRDY);
487 request->zero = 0;
488 }
489
490 if (request->actual == request->length) {
491 musb_g_giveback(musb_ep, request, 0);
492 /*
493 * In the giveback function the MUSB lock is
494 * released and acquired after sometime. During
495 * this time period the INDEX register could get
496 * changed by the gadget_queue function especially
497 * on SMP systems. Reselect the INDEX to be sure
498 * we are reading/modifying the right registers
499 */
500 musb_ep_select(mbase, epnum);
501 req = musb_ep->desc ? next_request(musb_ep) : NULL;
502 if (!req) {
503 musb_dbg(musb, "%s idle now",
504 musb_ep->end_point.name);
505 return;
506 }
507 }
508
509 txstate(musb, req);
510 }
511 }
512
513 /* ------------------------------------------------------------ */
514
515 /*
516 * Context: controller locked, IRQs blocked, endpoint selected
517 */
rxstate(struct musb * musb,struct musb_request * req)518 static void rxstate(struct musb *musb, struct musb_request *req)
519 {
520 const u8 epnum = req->epnum;
521 struct usb_request *request = &req->request;
522 struct musb_ep *musb_ep;
523 void __iomem *epio = musb->endpoints[epnum].regs;
524 unsigned len = 0;
525 u16 fifo_count;
526 u16 csr = musb_readw(epio, MUSB_RXCSR);
527 struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
528 u8 use_mode_1;
529
530 if (hw_ep->is_shared_fifo)
531 musb_ep = &hw_ep->ep_in;
532 else
533 musb_ep = &hw_ep->ep_out;
534
535 fifo_count = musb_ep->packet_sz;
536
537 /* Check if EP is disabled */
538 if (!musb_ep->desc) {
539 musb_dbg(musb, "ep:%s disabled - ignore request",
540 musb_ep->end_point.name);
541 return;
542 }
543
544 /* We shouldn't get here while DMA is active, but we do... */
545 if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
546 musb_dbg(musb, "DMA pending...");
547 return;
548 }
549
550 if (csr & MUSB_RXCSR_P_SENDSTALL) {
551 musb_dbg(musb, "%s stalling, RXCSR %04x",
552 musb_ep->end_point.name, csr);
553 return;
554 }
555
556 if (is_cppi_enabled(musb) && is_buffer_mapped(req)) {
557 struct dma_controller *c = musb->dma_controller;
558 struct dma_channel *channel = musb_ep->dma;
559
560 /* NOTE: CPPI won't actually stop advancing the DMA
561 * queue after short packet transfers, so this is almost
562 * always going to run as IRQ-per-packet DMA so that
563 * faults will be handled correctly.
564 */
565 if (c->channel_program(channel,
566 musb_ep->packet_sz,
567 !request->short_not_ok,
568 request->dma + request->actual,
569 request->length - request->actual)) {
570
571 /* make sure that if an rxpkt arrived after the irq,
572 * the cppi engine will be ready to take it as soon
573 * as DMA is enabled
574 */
575 csr &= ~(MUSB_RXCSR_AUTOCLEAR
576 | MUSB_RXCSR_DMAMODE);
577 csr |= MUSB_RXCSR_DMAENAB | MUSB_RXCSR_P_WZC_BITS;
578 musb_writew(epio, MUSB_RXCSR, csr);
579 return;
580 }
581 }
582
583 if (csr & MUSB_RXCSR_RXPKTRDY) {
584 fifo_count = musb_readw(epio, MUSB_RXCOUNT);
585
586 /*
587 * Enable Mode 1 on RX transfers only when short_not_ok flag
588 * is set. Currently short_not_ok flag is set only from
589 * file_storage and f_mass_storage drivers
590 */
591
592 if (request->short_not_ok && fifo_count == musb_ep->packet_sz)
593 use_mode_1 = 1;
594 else
595 use_mode_1 = 0;
596
597 if (request->actual < request->length) {
598 if (!is_buffer_mapped(req))
599 goto buffer_aint_mapped;
600
601 if (musb_dma_inventra(musb)) {
602 struct dma_controller *c;
603 struct dma_channel *channel;
604 int use_dma = 0;
605 unsigned int transfer_size;
606
607 c = musb->dma_controller;
608 channel = musb_ep->dma;
609
610 /* We use DMA Req mode 0 in rx_csr, and DMA controller operates in
611 * mode 0 only. So we do not get endpoint interrupts due to DMA
612 * completion. We only get interrupts from DMA controller.
613 *
614 * We could operate in DMA mode 1 if we knew the size of the transfer
615 * in advance. For mass storage class, request->length = what the host
616 * sends, so that'd work. But for pretty much everything else,
617 * request->length is routinely more than what the host sends. For
618 * most these gadgets, end of is signified either by a short packet,
619 * or filling the last byte of the buffer. (Sending extra data in
620 * that last pckate should trigger an overflow fault.) But in mode 1,
621 * we don't get DMA completion interrupt for short packets.
622 *
623 * Theoretically, we could enable DMAReq irq (MUSB_RXCSR_DMAMODE = 1),
624 * to get endpoint interrupt on every DMA req, but that didn't seem
625 * to work reliably.
626 *
627 * REVISIT an updated g_file_storage can set req->short_not_ok, which
628 * then becomes usable as a runtime "use mode 1" hint...
629 */
630
631 /* Experimental: Mode1 works with mass storage use cases */
632 if (use_mode_1) {
633 csr |= MUSB_RXCSR_AUTOCLEAR;
634 musb_writew(epio, MUSB_RXCSR, csr);
635 csr |= MUSB_RXCSR_DMAENAB;
636 musb_writew(epio, MUSB_RXCSR, csr);
637
638 /*
639 * this special sequence (enabling and then
640 * disabling MUSB_RXCSR_DMAMODE) is required
641 * to get DMAReq to activate
642 */
643 musb_writew(epio, MUSB_RXCSR,
644 csr | MUSB_RXCSR_DMAMODE);
645 musb_writew(epio, MUSB_RXCSR, csr);
646
647 transfer_size = min_t(unsigned int,
648 request->length -
649 request->actual,
650 channel->max_len);
651 musb_ep->dma->desired_mode = 1;
652 } else {
653 if (!musb_ep->hb_mult &&
654 musb_ep->hw_ep->rx_double_buffered)
655 csr |= MUSB_RXCSR_AUTOCLEAR;
656 csr |= MUSB_RXCSR_DMAENAB;
657 musb_writew(epio, MUSB_RXCSR, csr);
658
659 transfer_size = min(request->length - request->actual,
660 (unsigned)fifo_count);
661 musb_ep->dma->desired_mode = 0;
662 }
663
664 use_dma = c->channel_program(
665 channel,
666 musb_ep->packet_sz,
667 channel->desired_mode,
668 request->dma
669 + request->actual,
670 transfer_size);
671
672 if (use_dma)
673 return;
674 }
675
676 if ((musb_dma_ux500(musb)) &&
677 (request->actual < request->length)) {
678
679 struct dma_controller *c;
680 struct dma_channel *channel;
681 unsigned int transfer_size = 0;
682
683 c = musb->dma_controller;
684 channel = musb_ep->dma;
685
686 /* In case first packet is short */
687 if (fifo_count < musb_ep->packet_sz)
688 transfer_size = fifo_count;
689 else if (request->short_not_ok)
690 transfer_size = min_t(unsigned int,
691 request->length -
692 request->actual,
693 channel->max_len);
694 else
695 transfer_size = min_t(unsigned int,
696 request->length -
697 request->actual,
698 (unsigned)fifo_count);
699
700 csr &= ~MUSB_RXCSR_DMAMODE;
701 csr |= (MUSB_RXCSR_DMAENAB |
702 MUSB_RXCSR_AUTOCLEAR);
703
704 musb_writew(epio, MUSB_RXCSR, csr);
705
706 if (transfer_size <= musb_ep->packet_sz) {
707 musb_ep->dma->desired_mode = 0;
708 } else {
709 musb_ep->dma->desired_mode = 1;
710 /* Mode must be set after DMAENAB */
711 csr |= MUSB_RXCSR_DMAMODE;
712 musb_writew(epio, MUSB_RXCSR, csr);
713 }
714
715 if (c->channel_program(channel,
716 musb_ep->packet_sz,
717 channel->desired_mode,
718 request->dma
719 + request->actual,
720 transfer_size))
721
722 return;
723 }
724
725 len = request->length - request->actual;
726 musb_dbg(musb, "%s OUT/RX pio fifo %d/%d, maxpacket %d",
727 musb_ep->end_point.name,
728 fifo_count, len,
729 musb_ep->packet_sz);
730
731 fifo_count = min_t(unsigned, len, fifo_count);
732
733 if (tusb_dma_omap(musb)) {
734 struct dma_controller *c = musb->dma_controller;
735 struct dma_channel *channel = musb_ep->dma;
736 u32 dma_addr = request->dma + request->actual;
737 int ret;
738
739 ret = c->channel_program(channel,
740 musb_ep->packet_sz,
741 channel->desired_mode,
742 dma_addr,
743 fifo_count);
744 if (ret)
745 return;
746 }
747
748 /*
749 * Unmap the dma buffer back to cpu if dma channel
750 * programming fails. This buffer is mapped if the
751 * channel allocation is successful
752 */
753 unmap_dma_buffer(req, musb);
754
755 /*
756 * Clear DMAENAB and AUTOCLEAR for the
757 * PIO mode transfer
758 */
759 csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR);
760 musb_writew(epio, MUSB_RXCSR, csr);
761
762 buffer_aint_mapped:
763 fifo_count = min_t(unsigned int,
764 request->length - request->actual,
765 (unsigned int)fifo_count);
766 musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *)
767 (request->buf + request->actual));
768 request->actual += fifo_count;
769
770 /* REVISIT if we left anything in the fifo, flush
771 * it and report -EOVERFLOW
772 */
773
774 /* ack the read! */
775 csr |= MUSB_RXCSR_P_WZC_BITS;
776 csr &= ~MUSB_RXCSR_RXPKTRDY;
777 musb_writew(epio, MUSB_RXCSR, csr);
778 }
779 }
780
781 /* reach the end or short packet detected */
782 if (request->actual == request->length ||
783 fifo_count < musb_ep->packet_sz)
784 musb_g_giveback(musb_ep, request, 0);
785 }
786
787 /*
788 * Data ready for a request; called from IRQ
789 */
musb_g_rx(struct musb * musb,u8 epnum)790 void musb_g_rx(struct musb *musb, u8 epnum)
791 {
792 u16 csr;
793 struct musb_request *req;
794 struct usb_request *request;
795 void __iomem *mbase = musb->mregs;
796 struct musb_ep *musb_ep;
797 void __iomem *epio = musb->endpoints[epnum].regs;
798 struct dma_channel *dma;
799 struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
800
801 if (hw_ep->is_shared_fifo)
802 musb_ep = &hw_ep->ep_in;
803 else
804 musb_ep = &hw_ep->ep_out;
805
806 musb_ep_select(mbase, epnum);
807
808 req = next_request(musb_ep);
809 if (!req)
810 return;
811
812 trace_musb_req_rx(req);
813 request = &req->request;
814
815 csr = musb_readw(epio, MUSB_RXCSR);
816 dma = is_dma_capable() ? musb_ep->dma : NULL;
817
818 musb_dbg(musb, "<== %s, rxcsr %04x%s %p", musb_ep->end_point.name,
819 csr, dma ? " (dma)" : "", request);
820
821 if (csr & MUSB_RXCSR_P_SENTSTALL) {
822 csr |= MUSB_RXCSR_P_WZC_BITS;
823 csr &= ~MUSB_RXCSR_P_SENTSTALL;
824 musb_writew(epio, MUSB_RXCSR, csr);
825 return;
826 }
827
828 if (csr & MUSB_RXCSR_P_OVERRUN) {
829 /* csr |= MUSB_RXCSR_P_WZC_BITS; */
830 csr &= ~MUSB_RXCSR_P_OVERRUN;
831 musb_writew(epio, MUSB_RXCSR, csr);
832
833 musb_dbg(musb, "%s iso overrun on %p", musb_ep->name, request);
834 if (request->status == -EINPROGRESS)
835 request->status = -EOVERFLOW;
836 }
837 if (csr & MUSB_RXCSR_INCOMPRX) {
838 /* REVISIT not necessarily an error */
839 musb_dbg(musb, "%s, incomprx", musb_ep->end_point.name);
840 }
841
842 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
843 /* "should not happen"; likely RXPKTRDY pending for DMA */
844 musb_dbg(musb, "%s busy, csr %04x",
845 musb_ep->end_point.name, csr);
846 return;
847 }
848
849 if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
850 csr &= ~(MUSB_RXCSR_AUTOCLEAR
851 | MUSB_RXCSR_DMAENAB
852 | MUSB_RXCSR_DMAMODE);
853 musb_writew(epio, MUSB_RXCSR,
854 MUSB_RXCSR_P_WZC_BITS | csr);
855
856 request->actual += musb_ep->dma->actual_len;
857
858 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
859 defined(CONFIG_USB_UX500_DMA)
860 /* Autoclear doesn't clear RxPktRdy for short packets */
861 if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered)
862 || (dma->actual_len
863 & (musb_ep->packet_sz - 1))) {
864 /* ack the read! */
865 csr &= ~MUSB_RXCSR_RXPKTRDY;
866 musb_writew(epio, MUSB_RXCSR, csr);
867 }
868
869 /* incomplete, and not short? wait for next IN packet */
870 if ((request->actual < request->length)
871 && (musb_ep->dma->actual_len
872 == musb_ep->packet_sz)) {
873 /* In double buffer case, continue to unload fifo if
874 * there is Rx packet in FIFO.
875 **/
876 csr = musb_readw(epio, MUSB_RXCSR);
877 if ((csr & MUSB_RXCSR_RXPKTRDY) &&
878 hw_ep->rx_double_buffered)
879 goto exit;
880 return;
881 }
882 #endif
883 musb_g_giveback(musb_ep, request, 0);
884 /*
885 * In the giveback function the MUSB lock is
886 * released and acquired after sometime. During
887 * this time period the INDEX register could get
888 * changed by the gadget_queue function especially
889 * on SMP systems. Reselect the INDEX to be sure
890 * we are reading/modifying the right registers
891 */
892 musb_ep_select(mbase, epnum);
893
894 req = next_request(musb_ep);
895 if (!req)
896 return;
897 }
898 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
899 defined(CONFIG_USB_UX500_DMA)
900 exit:
901 #endif
902 /* Analyze request */
903 rxstate(musb, req);
904 }
905
906 /* ------------------------------------------------------------ */
907
musb_gadget_enable(struct usb_ep * ep,const struct usb_endpoint_descriptor * desc)908 static int musb_gadget_enable(struct usb_ep *ep,
909 const struct usb_endpoint_descriptor *desc)
910 {
911 unsigned long flags;
912 struct musb_ep *musb_ep;
913 struct musb_hw_ep *hw_ep;
914 void __iomem *regs;
915 struct musb *musb;
916 void __iomem *mbase;
917 u8 epnum;
918 u16 csr;
919 unsigned tmp;
920 int status = -EINVAL;
921
922 if (!ep || !desc)
923 return -EINVAL;
924
925 musb_ep = to_musb_ep(ep);
926 hw_ep = musb_ep->hw_ep;
927 regs = hw_ep->regs;
928 musb = musb_ep->musb;
929 mbase = musb->mregs;
930 epnum = musb_ep->current_epnum;
931
932 spin_lock_irqsave(&musb->lock, flags);
933
934 if (musb_ep->desc) {
935 status = -EBUSY;
936 goto fail;
937 }
938 musb_ep->type = usb_endpoint_type(desc);
939
940 /* check direction and (later) maxpacket size against endpoint */
941 if (usb_endpoint_num(desc) != epnum)
942 goto fail;
943
944 /* REVISIT this rules out high bandwidth periodic transfers */
945 tmp = usb_endpoint_maxp_mult(desc) - 1;
946 if (tmp) {
947 int ok;
948
949 if (usb_endpoint_dir_in(desc))
950 ok = musb->hb_iso_tx;
951 else
952 ok = musb->hb_iso_rx;
953
954 if (!ok) {
955 musb_dbg(musb, "no support for high bandwidth ISO");
956 goto fail;
957 }
958 musb_ep->hb_mult = tmp;
959 } else {
960 musb_ep->hb_mult = 0;
961 }
962
963 musb_ep->packet_sz = usb_endpoint_maxp(desc);
964 tmp = musb_ep->packet_sz * (musb_ep->hb_mult + 1);
965
966 /* enable the interrupts for the endpoint, set the endpoint
967 * packet size (or fail), set the mode, clear the fifo
968 */
969 musb_ep_select(mbase, epnum);
970 if (usb_endpoint_dir_in(desc)) {
971
972 if (hw_ep->is_shared_fifo)
973 musb_ep->is_in = 1;
974 if (!musb_ep->is_in)
975 goto fail;
976
977 if (tmp > hw_ep->max_packet_sz_tx) {
978 musb_dbg(musb, "packet size beyond hardware FIFO size");
979 goto fail;
980 }
981
982 musb->intrtxe |= (1 << epnum);
983 musb_writew(mbase, MUSB_INTRTXE, musb->intrtxe);
984
985 /* REVISIT if can_bulk_split(), use by updating "tmp";
986 * likewise high bandwidth periodic tx
987 */
988 /* Set TXMAXP with the FIFO size of the endpoint
989 * to disable double buffering mode.
990 */
991 if (can_bulk_split(musb, musb_ep->type))
992 musb_ep->hb_mult = (hw_ep->max_packet_sz_tx /
993 musb_ep->packet_sz) - 1;
994 musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz
995 | (musb_ep->hb_mult << 11));
996
997 csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG;
998 if (musb_readw(regs, MUSB_TXCSR)
999 & MUSB_TXCSR_FIFONOTEMPTY)
1000 csr |= MUSB_TXCSR_FLUSHFIFO;
1001 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
1002 csr |= MUSB_TXCSR_P_ISO;
1003
1004 /* set twice in case of double buffering */
1005 musb_writew(regs, MUSB_TXCSR, csr);
1006 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1007 musb_writew(regs, MUSB_TXCSR, csr);
1008
1009 } else {
1010
1011 if (hw_ep->is_shared_fifo)
1012 musb_ep->is_in = 0;
1013 if (musb_ep->is_in)
1014 goto fail;
1015
1016 if (tmp > hw_ep->max_packet_sz_rx) {
1017 musb_dbg(musb, "packet size beyond hardware FIFO size");
1018 goto fail;
1019 }
1020
1021 musb->intrrxe |= (1 << epnum);
1022 musb_writew(mbase, MUSB_INTRRXE, musb->intrrxe);
1023
1024 /* REVISIT if can_bulk_combine() use by updating "tmp"
1025 * likewise high bandwidth periodic rx
1026 */
1027 /* Set RXMAXP with the FIFO size of the endpoint
1028 * to disable double buffering mode.
1029 */
1030 musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz
1031 | (musb_ep->hb_mult << 11));
1032
1033 /* force shared fifo to OUT-only mode */
1034 if (hw_ep->is_shared_fifo) {
1035 csr = musb_readw(regs, MUSB_TXCSR);
1036 csr &= ~(MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY);
1037 musb_writew(regs, MUSB_TXCSR, csr);
1038 }
1039
1040 csr = MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_CLRDATATOG;
1041 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
1042 csr |= MUSB_RXCSR_P_ISO;
1043 else if (musb_ep->type == USB_ENDPOINT_XFER_INT)
1044 csr |= MUSB_RXCSR_DISNYET;
1045
1046 /* set twice in case of double buffering */
1047 musb_writew(regs, MUSB_RXCSR, csr);
1048 musb_writew(regs, MUSB_RXCSR, csr);
1049 }
1050
1051 /* NOTE: all the I/O code _should_ work fine without DMA, in case
1052 * for some reason you run out of channels here.
1053 */
1054 if (is_dma_capable() && musb->dma_controller) {
1055 struct dma_controller *c = musb->dma_controller;
1056
1057 musb_ep->dma = c->channel_alloc(c, hw_ep,
1058 (desc->bEndpointAddress & USB_DIR_IN));
1059 } else
1060 musb_ep->dma = NULL;
1061
1062 musb_ep->desc = desc;
1063 musb_ep->busy = 0;
1064 musb_ep->wedged = 0;
1065 status = 0;
1066
1067 pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n",
1068 musb_driver_name, musb_ep->end_point.name,
1069 musb_ep_xfertype_string(musb_ep->type),
1070 musb_ep->is_in ? "IN" : "OUT",
1071 musb_ep->dma ? "dma, " : "",
1072 musb_ep->packet_sz);
1073
1074 schedule_delayed_work(&musb->irq_work, 0);
1075
1076 fail:
1077 spin_unlock_irqrestore(&musb->lock, flags);
1078 return status;
1079 }
1080
1081 /*
1082 * Disable an endpoint flushing all requests queued.
1083 */
musb_gadget_disable(struct usb_ep * ep)1084 static int musb_gadget_disable(struct usb_ep *ep)
1085 {
1086 unsigned long flags;
1087 struct musb *musb;
1088 u8 epnum;
1089 struct musb_ep *musb_ep;
1090 void __iomem *epio;
1091
1092 musb_ep = to_musb_ep(ep);
1093 musb = musb_ep->musb;
1094 epnum = musb_ep->current_epnum;
1095 epio = musb->endpoints[epnum].regs;
1096
1097 spin_lock_irqsave(&musb->lock, flags);
1098 musb_ep_select(musb->mregs, epnum);
1099
1100 /* zero the endpoint sizes */
1101 if (musb_ep->is_in) {
1102 musb->intrtxe &= ~(1 << epnum);
1103 musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe);
1104 musb_writew(epio, MUSB_TXMAXP, 0);
1105 } else {
1106 musb->intrrxe &= ~(1 << epnum);
1107 musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
1108 musb_writew(epio, MUSB_RXMAXP, 0);
1109 }
1110
1111 /* abort all pending DMA and requests */
1112 nuke(musb_ep, -ESHUTDOWN);
1113
1114 musb_ep->desc = NULL;
1115 musb_ep->end_point.desc = NULL;
1116
1117 schedule_delayed_work(&musb->irq_work, 0);
1118
1119 spin_unlock_irqrestore(&(musb->lock), flags);
1120
1121 musb_dbg(musb, "%s", musb_ep->end_point.name);
1122
1123 return 0;
1124 }
1125
1126 /*
1127 * Allocate a request for an endpoint.
1128 * Reused by ep0 code.
1129 */
musb_alloc_request(struct usb_ep * ep,gfp_t gfp_flags)1130 struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1131 {
1132 struct musb_ep *musb_ep = to_musb_ep(ep);
1133 struct musb_request *request;
1134
1135 request = kzalloc(sizeof *request, gfp_flags);
1136 if (!request)
1137 return NULL;
1138
1139 request->request.dma = DMA_ADDR_INVALID;
1140 request->epnum = musb_ep->current_epnum;
1141 request->ep = musb_ep;
1142
1143 trace_musb_req_alloc(request);
1144 return &request->request;
1145 }
1146
1147 /*
1148 * Free a request
1149 * Reused by ep0 code.
1150 */
musb_free_request(struct usb_ep * ep,struct usb_request * req)1151 void musb_free_request(struct usb_ep *ep, struct usb_request *req)
1152 {
1153 struct musb_request *request = to_musb_request(req);
1154
1155 trace_musb_req_free(request);
1156 kfree(request);
1157 }
1158
1159 /*
1160 * Context: controller locked, IRQs blocked.
1161 */
musb_ep_restart(struct musb * musb,struct musb_request * req)1162 void musb_ep_restart(struct musb *musb, struct musb_request *req)
1163 {
1164 trace_musb_req_start(req);
1165 musb_ep_select(musb->mregs, req->epnum);
1166 if (req->tx)
1167 txstate(musb, req);
1168 else
1169 rxstate(musb, req);
1170 }
1171
musb_ep_restart_resume_work(struct musb * musb,void * data)1172 static int musb_ep_restart_resume_work(struct musb *musb, void *data)
1173 {
1174 struct musb_request *req = data;
1175
1176 musb_ep_restart(musb, req);
1177
1178 return 0;
1179 }
1180
musb_gadget_queue(struct usb_ep * ep,struct usb_request * req,gfp_t gfp_flags)1181 static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req,
1182 gfp_t gfp_flags)
1183 {
1184 struct musb_ep *musb_ep;
1185 struct musb_request *request;
1186 struct musb *musb;
1187 int status;
1188 unsigned long lockflags;
1189
1190 if (!ep || !req)
1191 return -EINVAL;
1192 if (!req->buf)
1193 return -ENODATA;
1194
1195 musb_ep = to_musb_ep(ep);
1196 musb = musb_ep->musb;
1197
1198 request = to_musb_request(req);
1199 request->musb = musb;
1200
1201 if (request->ep != musb_ep)
1202 return -EINVAL;
1203
1204 status = pm_runtime_get(musb->controller);
1205 if ((status != -EINPROGRESS) && status < 0) {
1206 dev_err(musb->controller,
1207 "pm runtime get failed in %s\n",
1208 __func__);
1209 pm_runtime_put_noidle(musb->controller);
1210
1211 return status;
1212 }
1213 status = 0;
1214
1215 trace_musb_req_enq(request);
1216
1217 /* request is mine now... */
1218 request->request.actual = 0;
1219 request->request.status = -EINPROGRESS;
1220 request->epnum = musb_ep->current_epnum;
1221 request->tx = musb_ep->is_in;
1222
1223 map_dma_buffer(request, musb, musb_ep);
1224
1225 spin_lock_irqsave(&musb->lock, lockflags);
1226
1227 /* don't queue if the ep is down */
1228 if (!musb_ep->desc) {
1229 musb_dbg(musb, "req %p queued to %s while ep %s",
1230 req, ep->name, "disabled");
1231 status = -ESHUTDOWN;
1232 unmap_dma_buffer(request, musb);
1233 goto unlock;
1234 }
1235
1236 /* add request to the list */
1237 list_add_tail(&request->list, &musb_ep->req_list);
1238
1239 /* it this is the head of the queue, start i/o ... */
1240 if (!musb_ep->busy && &request->list == musb_ep->req_list.next) {
1241 status = musb_queue_resume_work(musb,
1242 musb_ep_restart_resume_work,
1243 request);
1244 if (status < 0) {
1245 dev_err(musb->controller, "%s resume work: %i\n",
1246 __func__, status);
1247 list_del(&request->list);
1248 }
1249 }
1250
1251 unlock:
1252 spin_unlock_irqrestore(&musb->lock, lockflags);
1253 pm_runtime_mark_last_busy(musb->controller);
1254 pm_runtime_put_autosuspend(musb->controller);
1255
1256 return status;
1257 }
1258
musb_gadget_dequeue(struct usb_ep * ep,struct usb_request * request)1259 static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request)
1260 {
1261 struct musb_ep *musb_ep = to_musb_ep(ep);
1262 struct musb_request *req = to_musb_request(request);
1263 struct musb_request *r;
1264 unsigned long flags;
1265 int status = 0;
1266 struct musb *musb = musb_ep->musb;
1267
1268 if (!ep || !request || req->ep != musb_ep)
1269 return -EINVAL;
1270
1271 trace_musb_req_deq(req);
1272
1273 spin_lock_irqsave(&musb->lock, flags);
1274
1275 list_for_each_entry(r, &musb_ep->req_list, list) {
1276 if (r == req)
1277 break;
1278 }
1279 if (r != req) {
1280 dev_err(musb->controller, "request %p not queued to %s\n",
1281 request, ep->name);
1282 status = -EINVAL;
1283 goto done;
1284 }
1285
1286 /* if the hardware doesn't have the request, easy ... */
1287 if (musb_ep->req_list.next != &req->list || musb_ep->busy)
1288 musb_g_giveback(musb_ep, request, -ECONNRESET);
1289
1290 /* ... else abort the dma transfer ... */
1291 else if (is_dma_capable() && musb_ep->dma) {
1292 struct dma_controller *c = musb->dma_controller;
1293
1294 musb_ep_select(musb->mregs, musb_ep->current_epnum);
1295 if (c->channel_abort)
1296 status = c->channel_abort(musb_ep->dma);
1297 else
1298 status = -EBUSY;
1299 if (status == 0)
1300 musb_g_giveback(musb_ep, request, -ECONNRESET);
1301 } else {
1302 /* NOTE: by sticking to easily tested hardware/driver states,
1303 * we leave counting of in-flight packets imprecise.
1304 */
1305 musb_g_giveback(musb_ep, request, -ECONNRESET);
1306 }
1307
1308 done:
1309 spin_unlock_irqrestore(&musb->lock, flags);
1310 return status;
1311 }
1312
1313 /*
1314 * Set or clear the halt bit of an endpoint. A halted endpoint won't tx/rx any
1315 * data but will queue requests.
1316 *
1317 * exported to ep0 code
1318 */
musb_gadget_set_halt(struct usb_ep * ep,int value)1319 static int musb_gadget_set_halt(struct usb_ep *ep, int value)
1320 {
1321 struct musb_ep *musb_ep = to_musb_ep(ep);
1322 u8 epnum = musb_ep->current_epnum;
1323 struct musb *musb = musb_ep->musb;
1324 void __iomem *epio = musb->endpoints[epnum].regs;
1325 void __iomem *mbase;
1326 unsigned long flags;
1327 u16 csr;
1328 struct musb_request *request;
1329 int status = 0;
1330
1331 if (!ep)
1332 return -EINVAL;
1333 mbase = musb->mregs;
1334
1335 spin_lock_irqsave(&musb->lock, flags);
1336
1337 if ((USB_ENDPOINT_XFER_ISOC == musb_ep->type)) {
1338 status = -EINVAL;
1339 goto done;
1340 }
1341
1342 musb_ep_select(mbase, epnum);
1343
1344 request = next_request(musb_ep);
1345 if (value) {
1346 if (request) {
1347 musb_dbg(musb, "request in progress, cannot halt %s",
1348 ep->name);
1349 status = -EAGAIN;
1350 goto done;
1351 }
1352 /* Cannot portably stall with non-empty FIFO */
1353 if (musb_ep->is_in) {
1354 csr = musb_readw(epio, MUSB_TXCSR);
1355 if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
1356 musb_dbg(musb, "FIFO busy, cannot halt %s",
1357 ep->name);
1358 status = -EAGAIN;
1359 goto done;
1360 }
1361 }
1362 } else
1363 musb_ep->wedged = 0;
1364
1365 /* set/clear the stall and toggle bits */
1366 musb_dbg(musb, "%s: %s stall", ep->name, value ? "set" : "clear");
1367 if (musb_ep->is_in) {
1368 csr = musb_readw(epio, MUSB_TXCSR);
1369 csr |= MUSB_TXCSR_P_WZC_BITS
1370 | MUSB_TXCSR_CLRDATATOG;
1371 if (value)
1372 csr |= MUSB_TXCSR_P_SENDSTALL;
1373 else
1374 csr &= ~(MUSB_TXCSR_P_SENDSTALL
1375 | MUSB_TXCSR_P_SENTSTALL);
1376 csr &= ~MUSB_TXCSR_TXPKTRDY;
1377 musb_writew(epio, MUSB_TXCSR, csr);
1378 } else {
1379 csr = musb_readw(epio, MUSB_RXCSR);
1380 csr |= MUSB_RXCSR_P_WZC_BITS
1381 | MUSB_RXCSR_FLUSHFIFO
1382 | MUSB_RXCSR_CLRDATATOG;
1383 if (value)
1384 csr |= MUSB_RXCSR_P_SENDSTALL;
1385 else
1386 csr &= ~(MUSB_RXCSR_P_SENDSTALL
1387 | MUSB_RXCSR_P_SENTSTALL);
1388 musb_writew(epio, MUSB_RXCSR, csr);
1389 }
1390
1391 /* maybe start the first request in the queue */
1392 if (!musb_ep->busy && !value && request) {
1393 musb_dbg(musb, "restarting the request");
1394 musb_ep_restart(musb, request);
1395 }
1396
1397 done:
1398 spin_unlock_irqrestore(&musb->lock, flags);
1399 return status;
1400 }
1401
1402 /*
1403 * Sets the halt feature with the clear requests ignored
1404 */
musb_gadget_set_wedge(struct usb_ep * ep)1405 static int musb_gadget_set_wedge(struct usb_ep *ep)
1406 {
1407 struct musb_ep *musb_ep = to_musb_ep(ep);
1408
1409 if (!ep)
1410 return -EINVAL;
1411
1412 musb_ep->wedged = 1;
1413
1414 return usb_ep_set_halt(ep);
1415 }
1416
musb_gadget_fifo_status(struct usb_ep * ep)1417 static int musb_gadget_fifo_status(struct usb_ep *ep)
1418 {
1419 struct musb_ep *musb_ep = to_musb_ep(ep);
1420 void __iomem *epio = musb_ep->hw_ep->regs;
1421 int retval = -EINVAL;
1422
1423 if (musb_ep->desc && !musb_ep->is_in) {
1424 struct musb *musb = musb_ep->musb;
1425 int epnum = musb_ep->current_epnum;
1426 void __iomem *mbase = musb->mregs;
1427 unsigned long flags;
1428
1429 spin_lock_irqsave(&musb->lock, flags);
1430
1431 musb_ep_select(mbase, epnum);
1432 /* FIXME return zero unless RXPKTRDY is set */
1433 retval = musb_readw(epio, MUSB_RXCOUNT);
1434
1435 spin_unlock_irqrestore(&musb->lock, flags);
1436 }
1437 return retval;
1438 }
1439
musb_gadget_fifo_flush(struct usb_ep * ep)1440 static void musb_gadget_fifo_flush(struct usb_ep *ep)
1441 {
1442 struct musb_ep *musb_ep = to_musb_ep(ep);
1443 struct musb *musb = musb_ep->musb;
1444 u8 epnum = musb_ep->current_epnum;
1445 void __iomem *epio = musb->endpoints[epnum].regs;
1446 void __iomem *mbase;
1447 unsigned long flags;
1448 u16 csr;
1449
1450 mbase = musb->mregs;
1451
1452 spin_lock_irqsave(&musb->lock, flags);
1453 musb_ep_select(mbase, (u8) epnum);
1454
1455 /* disable interrupts */
1456 musb_writew(mbase, MUSB_INTRTXE, musb->intrtxe & ~(1 << epnum));
1457
1458 if (musb_ep->is_in) {
1459 csr = musb_readw(epio, MUSB_TXCSR);
1460 if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
1461 csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_P_WZC_BITS;
1462 /*
1463 * Setting both TXPKTRDY and FLUSHFIFO makes controller
1464 * to interrupt current FIFO loading, but not flushing
1465 * the already loaded ones.
1466 */
1467 csr &= ~MUSB_TXCSR_TXPKTRDY;
1468 musb_writew(epio, MUSB_TXCSR, csr);
1469 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1470 musb_writew(epio, MUSB_TXCSR, csr);
1471 }
1472 } else {
1473 csr = musb_readw(epio, MUSB_RXCSR);
1474 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_P_WZC_BITS;
1475 musb_writew(epio, MUSB_RXCSR, csr);
1476 musb_writew(epio, MUSB_RXCSR, csr);
1477 }
1478
1479 /* re-enable interrupt */
1480 musb_writew(mbase, MUSB_INTRTXE, musb->intrtxe);
1481 spin_unlock_irqrestore(&musb->lock, flags);
1482 }
1483
1484 static const struct usb_ep_ops musb_ep_ops = {
1485 .enable = musb_gadget_enable,
1486 .disable = musb_gadget_disable,
1487 .alloc_request = musb_alloc_request,
1488 .free_request = musb_free_request,
1489 .queue = musb_gadget_queue,
1490 .dequeue = musb_gadget_dequeue,
1491 .set_halt = musb_gadget_set_halt,
1492 .set_wedge = musb_gadget_set_wedge,
1493 .fifo_status = musb_gadget_fifo_status,
1494 .fifo_flush = musb_gadget_fifo_flush
1495 };
1496
1497 /* ----------------------------------------------------------------------- */
1498
musb_gadget_get_frame(struct usb_gadget * gadget)1499 static int musb_gadget_get_frame(struct usb_gadget *gadget)
1500 {
1501 struct musb *musb = gadget_to_musb(gadget);
1502
1503 return (int)musb_readw(musb->mregs, MUSB_FRAME);
1504 }
1505
musb_gadget_wakeup(struct usb_gadget * gadget)1506 static int musb_gadget_wakeup(struct usb_gadget *gadget)
1507 {
1508 struct musb *musb = gadget_to_musb(gadget);
1509 void __iomem *mregs = musb->mregs;
1510 unsigned long flags;
1511 int status = -EINVAL;
1512 u8 power, devctl;
1513 int retries;
1514
1515 spin_lock_irqsave(&musb->lock, flags);
1516
1517 switch (musb_get_state(musb)) {
1518 case OTG_STATE_B_PERIPHERAL:
1519 /* NOTE: OTG state machine doesn't include B_SUSPENDED;
1520 * that's part of the standard usb 1.1 state machine, and
1521 * doesn't affect OTG transitions.
1522 */
1523 if (musb->may_wakeup && musb->is_suspended)
1524 break;
1525 goto done;
1526 case OTG_STATE_B_IDLE:
1527 /* Start SRP ... OTG not required. */
1528 devctl = musb_readb(mregs, MUSB_DEVCTL);
1529 musb_dbg(musb, "Sending SRP: devctl: %02x", devctl);
1530 devctl |= MUSB_DEVCTL_SESSION;
1531 musb_writeb(mregs, MUSB_DEVCTL, devctl);
1532 devctl = musb_readb(mregs, MUSB_DEVCTL);
1533 retries = 100;
1534 while (!(devctl & MUSB_DEVCTL_SESSION)) {
1535 devctl = musb_readb(mregs, MUSB_DEVCTL);
1536 if (retries-- < 1)
1537 break;
1538 }
1539 retries = 10000;
1540 while (devctl & MUSB_DEVCTL_SESSION) {
1541 devctl = musb_readb(mregs, MUSB_DEVCTL);
1542 if (retries-- < 1)
1543 break;
1544 }
1545
1546 if (musb->xceiv) {
1547 spin_unlock_irqrestore(&musb->lock, flags);
1548 otg_start_srp(musb->xceiv->otg);
1549 spin_lock_irqsave(&musb->lock, flags);
1550 }
1551
1552 /* Block idling for at least 1s */
1553 musb_platform_try_idle(musb,
1554 jiffies + msecs_to_jiffies(1 * HZ));
1555
1556 status = 0;
1557 goto done;
1558 default:
1559 musb_dbg(musb, "Unhandled wake: %s",
1560 musb_otg_state_string(musb));
1561 goto done;
1562 }
1563
1564 status = 0;
1565
1566 power = musb_readb(mregs, MUSB_POWER);
1567 power |= MUSB_POWER_RESUME;
1568 musb_writeb(mregs, MUSB_POWER, power);
1569 musb_dbg(musb, "issue wakeup");
1570
1571 /* FIXME do this next chunk in a timer callback, no udelay */
1572 mdelay(2);
1573
1574 power = musb_readb(mregs, MUSB_POWER);
1575 power &= ~MUSB_POWER_RESUME;
1576 musb_writeb(mregs, MUSB_POWER, power);
1577 done:
1578 spin_unlock_irqrestore(&musb->lock, flags);
1579 return status;
1580 }
1581
1582 static int
musb_gadget_set_self_powered(struct usb_gadget * gadget,int is_selfpowered)1583 musb_gadget_set_self_powered(struct usb_gadget *gadget, int is_selfpowered)
1584 {
1585 gadget->is_selfpowered = !!is_selfpowered;
1586 return 0;
1587 }
1588
musb_pullup(struct musb * musb,int is_on)1589 static void musb_pullup(struct musb *musb, int is_on)
1590 {
1591 u8 power;
1592
1593 power = musb_readb(musb->mregs, MUSB_POWER);
1594 if (is_on)
1595 power |= MUSB_POWER_SOFTCONN;
1596 else
1597 power &= ~MUSB_POWER_SOFTCONN;
1598
1599 /* FIXME if on, HdrcStart; if off, HdrcStop */
1600
1601 musb_dbg(musb, "gadget D+ pullup %s",
1602 is_on ? "on" : "off");
1603 musb_writeb(musb->mregs, MUSB_POWER, power);
1604 }
1605
1606 #if 0
1607 static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active)
1608 {
1609 musb_dbg(musb, "<= %s =>\n", __func__);
1610
1611 /*
1612 * FIXME iff driver's softconnect flag is set (as it is during probe,
1613 * though that can clear it), just musb_pullup().
1614 */
1615
1616 return -EINVAL;
1617 }
1618 #endif
1619
musb_gadget_vbus_draw(struct usb_gadget * gadget,unsigned mA)1620 static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1621 {
1622 struct musb *musb = gadget_to_musb(gadget);
1623
1624 return usb_phy_set_power(musb->xceiv, mA);
1625 }
1626
musb_gadget_work(struct work_struct * work)1627 static void musb_gadget_work(struct work_struct *work)
1628 {
1629 struct musb *musb;
1630 unsigned long flags;
1631
1632 musb = container_of(work, struct musb, gadget_work.work);
1633 pm_runtime_get_sync(musb->controller);
1634 spin_lock_irqsave(&musb->lock, flags);
1635 musb_pullup(musb, musb->softconnect);
1636 spin_unlock_irqrestore(&musb->lock, flags);
1637 pm_runtime_mark_last_busy(musb->controller);
1638 pm_runtime_put_autosuspend(musb->controller);
1639 }
1640
musb_gadget_pullup(struct usb_gadget * gadget,int is_on)1641 static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on)
1642 {
1643 struct musb *musb = gadget_to_musb(gadget);
1644 unsigned long flags;
1645
1646 is_on = !!is_on;
1647
1648 /* NOTE: this assumes we are sensing vbus; we'd rather
1649 * not pullup unless the B-session is active.
1650 */
1651 spin_lock_irqsave(&musb->lock, flags);
1652 if (is_on != musb->softconnect) {
1653 musb->softconnect = is_on;
1654 schedule_delayed_work(&musb->gadget_work, 0);
1655 }
1656 spin_unlock_irqrestore(&musb->lock, flags);
1657
1658 return 0;
1659 }
1660
1661 static int musb_gadget_start(struct usb_gadget *g,
1662 struct usb_gadget_driver *driver);
1663 static int musb_gadget_stop(struct usb_gadget *g);
1664
1665 static const struct usb_gadget_ops musb_gadget_operations = {
1666 .get_frame = musb_gadget_get_frame,
1667 .wakeup = musb_gadget_wakeup,
1668 .set_selfpowered = musb_gadget_set_self_powered,
1669 /* .vbus_session = musb_gadget_vbus_session, */
1670 .vbus_draw = musb_gadget_vbus_draw,
1671 .pullup = musb_gadget_pullup,
1672 .udc_start = musb_gadget_start,
1673 .udc_stop = musb_gadget_stop,
1674 };
1675
1676 /* ----------------------------------------------------------------------- */
1677
1678 /* Registration */
1679
1680 /* Only this registration code "knows" the rule (from USB standards)
1681 * about there being only one external upstream port. It assumes
1682 * all peripheral ports are external...
1683 */
1684
1685 static void
init_peripheral_ep(struct musb * musb,struct musb_ep * ep,u8 epnum,int is_in)1686 init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in)
1687 {
1688 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1689
1690 memset(ep, 0, sizeof *ep);
1691
1692 ep->current_epnum = epnum;
1693 ep->musb = musb;
1694 ep->hw_ep = hw_ep;
1695 ep->is_in = is_in;
1696
1697 INIT_LIST_HEAD(&ep->req_list);
1698
1699 sprintf(ep->name, "ep%d%s", epnum,
1700 (!epnum || hw_ep->is_shared_fifo) ? "" : (
1701 is_in ? "in" : "out"));
1702 ep->end_point.name = ep->name;
1703 INIT_LIST_HEAD(&ep->end_point.ep_list);
1704 if (!epnum) {
1705 usb_ep_set_maxpacket_limit(&ep->end_point, 64);
1706 ep->end_point.caps.type_control = true;
1707 ep->end_point.ops = &musb_g_ep0_ops;
1708 musb->g.ep0 = &ep->end_point;
1709 } else {
1710 if (is_in)
1711 usb_ep_set_maxpacket_limit(&ep->end_point, hw_ep->max_packet_sz_tx);
1712 else
1713 usb_ep_set_maxpacket_limit(&ep->end_point, hw_ep->max_packet_sz_rx);
1714 ep->end_point.caps.type_iso = true;
1715 ep->end_point.caps.type_bulk = true;
1716 ep->end_point.caps.type_int = true;
1717 ep->end_point.ops = &musb_ep_ops;
1718 list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list);
1719 }
1720
1721 if (!epnum || hw_ep->is_shared_fifo) {
1722 ep->end_point.caps.dir_in = true;
1723 ep->end_point.caps.dir_out = true;
1724 } else if (is_in)
1725 ep->end_point.caps.dir_in = true;
1726 else
1727 ep->end_point.caps.dir_out = true;
1728 }
1729
1730 /*
1731 * Initialize the endpoints exposed to peripheral drivers, with backlinks
1732 * to the rest of the driver state.
1733 */
musb_g_init_endpoints(struct musb * musb)1734 static inline void musb_g_init_endpoints(struct musb *musb)
1735 {
1736 u8 epnum;
1737 struct musb_hw_ep *hw_ep;
1738
1739 /* initialize endpoint list just once */
1740 INIT_LIST_HEAD(&(musb->g.ep_list));
1741
1742 for (epnum = 0, hw_ep = musb->endpoints;
1743 epnum < musb->nr_endpoints;
1744 epnum++, hw_ep++) {
1745 if (hw_ep->is_shared_fifo /* || !epnum */) {
1746 init_peripheral_ep(musb, &hw_ep->ep_in, epnum, 0);
1747 } else {
1748 if (hw_ep->max_packet_sz_tx) {
1749 init_peripheral_ep(musb, &hw_ep->ep_in,
1750 epnum, 1);
1751 }
1752 if (hw_ep->max_packet_sz_rx) {
1753 init_peripheral_ep(musb, &hw_ep->ep_out,
1754 epnum, 0);
1755 }
1756 }
1757 }
1758 }
1759
1760 /* called once during driver setup to initialize and link into
1761 * the driver model; memory is zeroed.
1762 */
musb_gadget_setup(struct musb * musb)1763 int musb_gadget_setup(struct musb *musb)
1764 {
1765 int status;
1766
1767 /* REVISIT minor race: if (erroneously) setting up two
1768 * musb peripherals at the same time, only the bus lock
1769 * is probably held.
1770 */
1771
1772 musb->g.ops = &musb_gadget_operations;
1773 musb->g.max_speed = USB_SPEED_HIGH;
1774 musb->g.speed = USB_SPEED_UNKNOWN;
1775
1776 MUSB_DEV_MODE(musb);
1777 musb_set_state(musb, OTG_STATE_B_IDLE);
1778
1779 /* this "gadget" abstracts/virtualizes the controller */
1780 musb->g.name = musb_driver_name;
1781 /* don't support otg protocols */
1782 musb->g.is_otg = 0;
1783 INIT_DELAYED_WORK(&musb->gadget_work, musb_gadget_work);
1784 musb_g_init_endpoints(musb);
1785
1786 musb->is_active = 0;
1787 musb_platform_try_idle(musb, 0);
1788
1789 status = usb_add_gadget_udc(musb->controller, &musb->g);
1790 if (status)
1791 goto err;
1792
1793 return 0;
1794 err:
1795 musb->g.dev.parent = NULL;
1796 device_unregister(&musb->g.dev);
1797 return status;
1798 }
1799
musb_gadget_cleanup(struct musb * musb)1800 void musb_gadget_cleanup(struct musb *musb)
1801 {
1802 if (musb->port_mode == MUSB_HOST)
1803 return;
1804
1805 cancel_delayed_work_sync(&musb->gadget_work);
1806 usb_del_gadget_udc(&musb->g);
1807 }
1808
1809 /*
1810 * Register the gadget driver. Used by gadget drivers when
1811 * registering themselves with the controller.
1812 *
1813 * -EINVAL something went wrong (not driver)
1814 * -EBUSY another gadget is already using the controller
1815 * -ENOMEM no memory to perform the operation
1816 *
1817 * @param driver the gadget driver
1818 * @return <0 if error, 0 if everything is fine
1819 */
musb_gadget_start(struct usb_gadget * g,struct usb_gadget_driver * driver)1820 static int musb_gadget_start(struct usb_gadget *g,
1821 struct usb_gadget_driver *driver)
1822 {
1823 struct musb *musb = gadget_to_musb(g);
1824 unsigned long flags;
1825 int retval = 0;
1826
1827 if (driver->max_speed < USB_SPEED_HIGH) {
1828 retval = -EINVAL;
1829 goto err;
1830 }
1831
1832 pm_runtime_get_sync(musb->controller);
1833
1834 musb->softconnect = 0;
1835 musb->gadget_driver = driver;
1836
1837 spin_lock_irqsave(&musb->lock, flags);
1838 musb->is_active = 1;
1839
1840 if (musb->xceiv)
1841 otg_set_peripheral(musb->xceiv->otg, &musb->g);
1842 else
1843 phy_set_mode(musb->phy, PHY_MODE_USB_DEVICE);
1844
1845 musb_set_state(musb, OTG_STATE_B_IDLE);
1846 spin_unlock_irqrestore(&musb->lock, flags);
1847
1848 musb_start(musb);
1849
1850 /* REVISIT: funcall to other code, which also
1851 * handles power budgeting ... this way also
1852 * ensures HdrcStart is indirectly called.
1853 */
1854 if (musb->xceiv && musb->xceiv->last_event == USB_EVENT_ID)
1855 musb_platform_set_vbus(musb, 1);
1856
1857 pm_runtime_mark_last_busy(musb->controller);
1858 pm_runtime_put_autosuspend(musb->controller);
1859
1860 return 0;
1861
1862 err:
1863 return retval;
1864 }
1865
1866 /*
1867 * Unregister the gadget driver. Used by gadget drivers when
1868 * unregistering themselves from the controller.
1869 *
1870 * @param driver the gadget driver to unregister
1871 */
musb_gadget_stop(struct usb_gadget * g)1872 static int musb_gadget_stop(struct usb_gadget *g)
1873 {
1874 struct musb *musb = gadget_to_musb(g);
1875 unsigned long flags;
1876
1877 pm_runtime_get_sync(musb->controller);
1878
1879 /*
1880 * REVISIT always use otg_set_peripheral() here too;
1881 * this needs to shut down the OTG engine.
1882 */
1883
1884 spin_lock_irqsave(&musb->lock, flags);
1885
1886 musb_hnp_stop(musb);
1887
1888 (void) musb_gadget_vbus_draw(&musb->g, 0);
1889
1890 musb_set_state(musb, OTG_STATE_UNDEFINED);
1891 musb_stop(musb);
1892
1893 if (musb->xceiv)
1894 otg_set_peripheral(musb->xceiv->otg, NULL);
1895 else
1896 phy_set_mode(musb->phy, PHY_MODE_INVALID);
1897
1898 musb->is_active = 0;
1899 musb->gadget_driver = NULL;
1900 musb_platform_try_idle(musb, 0);
1901 spin_unlock_irqrestore(&musb->lock, flags);
1902
1903 /*
1904 * FIXME we need to be able to register another
1905 * gadget driver here and have everything work;
1906 * that currently misbehaves.
1907 */
1908
1909 /* Force check of devctl register for PM runtime */
1910 pm_runtime_mark_last_busy(musb->controller);
1911 pm_runtime_put_autosuspend(musb->controller);
1912
1913 return 0;
1914 }
1915
1916 /* ----------------------------------------------------------------------- */
1917
1918 /* lifecycle operations called through plat_uds.c */
1919
musb_g_resume(struct musb * musb)1920 void musb_g_resume(struct musb *musb)
1921 {
1922 musb->is_suspended = 0;
1923 switch (musb_get_state(musb)) {
1924 case OTG_STATE_B_IDLE:
1925 break;
1926 case OTG_STATE_B_WAIT_ACON:
1927 case OTG_STATE_B_PERIPHERAL:
1928 musb->is_active = 1;
1929 if (musb->gadget_driver && musb->gadget_driver->resume) {
1930 spin_unlock(&musb->lock);
1931 musb->gadget_driver->resume(&musb->g);
1932 spin_lock(&musb->lock);
1933 }
1934 break;
1935 default:
1936 WARNING("unhandled RESUME transition (%s)\n",
1937 musb_otg_state_string(musb));
1938 }
1939 }
1940
1941 /* called when SOF packets stop for 3+ msec */
musb_g_suspend(struct musb * musb)1942 void musb_g_suspend(struct musb *musb)
1943 {
1944 u8 devctl;
1945
1946 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
1947 musb_dbg(musb, "musb_g_suspend: devctl %02x", devctl);
1948
1949 switch (musb_get_state(musb)) {
1950 case OTG_STATE_B_IDLE:
1951 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
1952 musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
1953 break;
1954 case OTG_STATE_B_PERIPHERAL:
1955 musb->is_suspended = 1;
1956 if (musb->gadget_driver && musb->gadget_driver->suspend) {
1957 spin_unlock(&musb->lock);
1958 musb->gadget_driver->suspend(&musb->g);
1959 spin_lock(&musb->lock);
1960 }
1961 break;
1962 default:
1963 /* REVISIT if B_HOST, clear DEVCTL.HOSTREQ;
1964 * A_PERIPHERAL may need care too
1965 */
1966 WARNING("unhandled SUSPEND transition (%s)",
1967 musb_otg_state_string(musb));
1968 }
1969 }
1970
1971 /* Called during SRP */
musb_g_wakeup(struct musb * musb)1972 void musb_g_wakeup(struct musb *musb)
1973 {
1974 musb_gadget_wakeup(&musb->g);
1975 }
1976
1977 /* called when VBUS drops below session threshold, and in other cases */
musb_g_disconnect(struct musb * musb)1978 void musb_g_disconnect(struct musb *musb)
1979 {
1980 void __iomem *mregs = musb->mregs;
1981 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
1982
1983 musb_dbg(musb, "musb_g_disconnect: devctl %02x", devctl);
1984
1985 /* clear HR */
1986 musb_writeb(mregs, MUSB_DEVCTL, devctl & MUSB_DEVCTL_SESSION);
1987
1988 /* don't draw vbus until new b-default session */
1989 (void) musb_gadget_vbus_draw(&musb->g, 0);
1990
1991 musb->g.speed = USB_SPEED_UNKNOWN;
1992 if (musb->gadget_driver && musb->gadget_driver->disconnect) {
1993 spin_unlock(&musb->lock);
1994 musb->gadget_driver->disconnect(&musb->g);
1995 spin_lock(&musb->lock);
1996 }
1997
1998 switch (musb_get_state(musb)) {
1999 default:
2000 musb_dbg(musb, "Unhandled disconnect %s, setting a_idle",
2001 musb_otg_state_string(musb));
2002 musb_set_state(musb, OTG_STATE_A_IDLE);
2003 MUSB_HST_MODE(musb);
2004 break;
2005 case OTG_STATE_A_PERIPHERAL:
2006 musb_set_state(musb, OTG_STATE_A_WAIT_BCON);
2007 MUSB_HST_MODE(musb);
2008 break;
2009 case OTG_STATE_B_WAIT_ACON:
2010 case OTG_STATE_B_HOST:
2011 case OTG_STATE_B_PERIPHERAL:
2012 case OTG_STATE_B_IDLE:
2013 musb_set_state(musb, OTG_STATE_B_IDLE);
2014 break;
2015 case OTG_STATE_B_SRP_INIT:
2016 break;
2017 }
2018
2019 musb->is_active = 0;
2020 }
2021
musb_g_reset(struct musb * musb)2022 void musb_g_reset(struct musb *musb)
2023 __releases(musb->lock)
2024 __acquires(musb->lock)
2025 {
2026 void __iomem *mbase = musb->mregs;
2027 u8 devctl = musb_readb(mbase, MUSB_DEVCTL);
2028 u8 power;
2029
2030 musb_dbg(musb, "<== %s driver '%s'",
2031 (devctl & MUSB_DEVCTL_BDEVICE)
2032 ? "B-Device" : "A-Device",
2033 musb->gadget_driver
2034 ? musb->gadget_driver->driver.name
2035 : NULL
2036 );
2037
2038 /* report reset, if we didn't already (flushing EP state) */
2039 if (musb->gadget_driver && musb->g.speed != USB_SPEED_UNKNOWN) {
2040 spin_unlock(&musb->lock);
2041 usb_gadget_udc_reset(&musb->g, musb->gadget_driver);
2042 spin_lock(&musb->lock);
2043 }
2044
2045 /* clear HR */
2046 else if (devctl & MUSB_DEVCTL_HR)
2047 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
2048
2049
2050 /* what speed did we negotiate? */
2051 power = musb_readb(mbase, MUSB_POWER);
2052 musb->g.speed = (power & MUSB_POWER_HSMODE)
2053 ? USB_SPEED_HIGH : USB_SPEED_FULL;
2054
2055 /* start in USB_STATE_DEFAULT */
2056 musb->is_active = 1;
2057 musb->is_suspended = 0;
2058 MUSB_DEV_MODE(musb);
2059 musb->address = 0;
2060 musb->ep0_state = MUSB_EP0_STAGE_SETUP;
2061
2062 musb->may_wakeup = 0;
2063 musb->g.b_hnp_enable = 0;
2064 musb->g.a_alt_hnp_support = 0;
2065 musb->g.a_hnp_support = 0;
2066 musb->g.quirk_zlp_not_supp = 1;
2067
2068 /* Normal reset, as B-Device;
2069 * or else after HNP, as A-Device
2070 */
2071 if (!musb->g.is_otg) {
2072 /* USB device controllers that are not OTG compatible
2073 * may not have DEVCTL register in silicon.
2074 * In that case, do not rely on devctl for setting
2075 * peripheral mode.
2076 */
2077 musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
2078 musb->g.is_a_peripheral = 0;
2079 } else if (devctl & MUSB_DEVCTL_BDEVICE) {
2080 musb_set_state(musb, OTG_STATE_B_PERIPHERAL);
2081 musb->g.is_a_peripheral = 0;
2082 } else {
2083 musb_set_state(musb, OTG_STATE_A_PERIPHERAL);
2084 musb->g.is_a_peripheral = 1;
2085 }
2086
2087 /* start with default limits on VBUS power draw */
2088 (void) musb_gadget_vbus_draw(&musb->g, 8);
2089 }
2090