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 */
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>
48 #include "musb_core.h"
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 */
93 /* ----------------------------------------------------------------------- */
95 #define is_buffer_mapped(req) (is_dma_capable() && \
96 (req->map_state != UN_MAPPED))
98 /* Maps the buffer to dma */
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;
106 request->map_state = UN_MAPPED;
108 if (!is_dma_capable() || !musb_ep->dma)
109 return;
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;
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 }
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;
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 }
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;
191 req = to_musb_request(request);
193 list_del(&req->list);
194 if (req->request.status == -EINPROGRESS)
195 req->request.status = status;
196 musb = req->musb;
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 }
215 /* ----------------------------------------------------------------------- */
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;
227 ep->busy = 1;
229 if (is_dma_capable() && ep->dma) {
230 struct dma_controller *c = ep->musb->dma_controller;
231 int value;
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 }
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 }
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 }
263 /* ----------------------------------------------------------------------- */
265 /* Data transfers - pure PIO, pure DMA, or mixed mode */
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 */
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 }
281 #ifdef CONFIG_USB_INVENTRA_DMA
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,
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().
293 - Request is queued by the gadget driver.
294 -> if queue was previously empty, txstate()
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 |___________________________________|
309 * Non-Mentor DMA engines can of course work differently, such as by
310 * upleveling from irq-per-packet to irq-per-buffer.
311 */
313 #endif
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;
331 musb_ep = req->ep;
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 }
339 /* read TXCSR before */
340 csr = musb_readw(epio, MUSB_TXCSR);
342 request = &req->request;
343 fifo_count = min(max_ep_writesize(musb, musb_ep),
344 (int)(request->length - request->actual));
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 }
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 }
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);
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;
367 /* setup DMA, then program endpoint CSR */
368 request_size = min_t(size_t, request->length - request->actual,
369 musb_ep->dma->max_len);
371 use_dma = (request->dma != DMA_ADDR_INVALID);
373 /* MUSB_TXCSR_P_ISO is still set correctly */
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;
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;
411 musb_writew(epio, MUSB_TXCSR, csr);
412 }
413 }
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);
424 /* ensure writebuffer is empty */
425 csr = musb_readw(epio, MUSB_TXCSR);
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 */
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
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);
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 }
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 }
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;
497 musb_ep_select(mbase, epnum);
498 req = next_request(musb_ep);
499 request = &req->request;
501 csr = musb_readw(epio, MUSB_TXCSR);
502 dev_dbg(musb->controller, "<== %s, txcsr %04x\n", musb_ep->end_point.name, csr);
504 dma = is_dma_capable() ? musb_ep->dma : NULL;
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 }
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 }
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 }
535 if (request) {
536 u8 is_dma = 0;
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 }
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;
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 }
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 }
587 txstate(musb, req);
588 }
589 }
591 /* ------------------------------------------------------------ */
593 #ifdef CONFIG_USB_INVENTRA_DMA
595 /* Peripheral rx (OUT) using Mentor DMA works as follows:
596 - Only mode 0 is used.
598 - Request is queued by the gadget class driver.
599 -> if queue was previously empty, rxstate()
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 |__________________________________________________|
619 * Non-Mentor DMA engines can of course work differently.
620 */
622 #endif
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 u8 use_mode_1;
639 if (hw_ep->is_shared_fifo)
640 musb_ep = &hw_ep->ep_in;
641 else
642 musb_ep = &hw_ep->ep_out;
644 len = musb_ep->packet_sz;
646 /* We shouldn't get here while DMA is active, but we do... */
647 if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
648 dev_dbg(musb->controller, "DMA pending...\n");
649 return;
650 }
652 if (csr & MUSB_RXCSR_P_SENDSTALL) {
653 dev_dbg(musb->controller, "%s stalling, RXCSR %04x\n",
654 musb_ep->end_point.name, csr);
655 return;
656 }
658 if (is_cppi_enabled() && is_buffer_mapped(req)) {
659 struct dma_controller *c = musb->dma_controller;
660 struct dma_channel *channel = musb_ep->dma;
662 /* NOTE: CPPI won't actually stop advancing the DMA
663 * queue after short packet transfers, so this is almost
664 * always going to run as IRQ-per-packet DMA so that
665 * faults will be handled correctly.
666 */
667 if (c->channel_program(channel,
668 musb_ep->packet_sz,
669 !request->short_not_ok,
670 request->dma + request->actual,
671 request->length - request->actual)) {
673 /* make sure that if an rxpkt arrived after the irq,
674 * the cppi engine will be ready to take it as soon
675 * as DMA is enabled
676 */
677 csr &= ~(MUSB_RXCSR_AUTOCLEAR
678 | MUSB_RXCSR_DMAMODE);
679 csr |= MUSB_RXCSR_DMAENAB | MUSB_RXCSR_P_WZC_BITS;
680 musb_writew(epio, MUSB_RXCSR, csr);
681 return;
682 }
683 }
685 if (csr & MUSB_RXCSR_RXPKTRDY) {
686 len = musb_readw(epio, MUSB_RXCOUNT);
688 /*
689 * Enable Mode 1 on RX transfers only when short_not_ok flag
690 * is set. Currently short_not_ok flag is set only from
691 * file_storage and f_mass_storage drivers
692 */
694 if (request->short_not_ok && len == musb_ep->packet_sz)
695 use_mode_1 = 1;
696 else
697 use_mode_1 = 0;
699 if (request->actual < request->length) {
700 #ifdef CONFIG_USB_INVENTRA_DMA
701 if (is_buffer_mapped(req)) {
702 struct dma_controller *c;
703 struct dma_channel *channel;
704 int use_dma = 0;
706 c = musb->dma_controller;
707 channel = musb_ep->dma;
709 /* We use DMA Req mode 0 in rx_csr, and DMA controller operates in
710 * mode 0 only. So we do not get endpoint interrupts due to DMA
711 * completion. We only get interrupts from DMA controller.
712 *
713 * We could operate in DMA mode 1 if we knew the size of the tranfer
714 * in advance. For mass storage class, request->length = what the host
715 * sends, so that'd work. But for pretty much everything else,
716 * request->length is routinely more than what the host sends. For
717 * most these gadgets, end of is signified either by a short packet,
718 * or filling the last byte of the buffer. (Sending extra data in
719 * that last pckate should trigger an overflow fault.) But in mode 1,
720 * we don't get DMA completion interrupt for short packets.
721 *
722 * Theoretically, we could enable DMAReq irq (MUSB_RXCSR_DMAMODE = 1),
723 * to get endpoint interrupt on every DMA req, but that didn't seem
724 * to work reliably.
725 *
726 * REVISIT an updated g_file_storage can set req->short_not_ok, which
727 * then becomes usable as a runtime "use mode 1" hint...
728 */
730 /* Experimental: Mode1 works with mass storage use cases */
731 if (use_mode_1) {
732 csr |= MUSB_RXCSR_AUTOCLEAR;
733 musb_writew(epio, MUSB_RXCSR, csr);
734 csr |= MUSB_RXCSR_DMAENAB;
735 musb_writew(epio, MUSB_RXCSR, csr);
737 /*
738 * this special sequence (enabling and then
739 * disabling MUSB_RXCSR_DMAMODE) is required
740 * to get DMAReq to activate
741 */
742 musb_writew(epio, MUSB_RXCSR,
743 csr | MUSB_RXCSR_DMAMODE);
744 musb_writew(epio, MUSB_RXCSR, csr);
746 } else {
747 if (!musb_ep->hb_mult &&
748 musb_ep->hw_ep->rx_double_buffered)
749 csr |= MUSB_RXCSR_AUTOCLEAR;
750 csr |= MUSB_RXCSR_DMAENAB;
751 musb_writew(epio, MUSB_RXCSR, csr);
752 }
754 if (request->actual < request->length) {
755 int transfer_size = 0;
756 if (use_mode_1) {
757 transfer_size = min(request->length - request->actual,
758 channel->max_len);
759 musb_ep->dma->desired_mode = 1;
760 } else {
761 transfer_size = min(request->length - request->actual,
762 (unsigned)len);
763 musb_ep->dma->desired_mode = 0;
764 }
766 use_dma = c->channel_program(
767 channel,
768 musb_ep->packet_sz,
769 channel->desired_mode,
770 request->dma
771 + request->actual,
772 transfer_size);
773 }
775 if (use_dma)
776 return;
777 }
778 #elif defined(CONFIG_USB_UX500_DMA)
779 if ((is_buffer_mapped(req)) &&
780 (request->actual < request->length)) {
782 struct dma_controller *c;
783 struct dma_channel *channel;
784 int transfer_size = 0;
786 c = musb->dma_controller;
787 channel = musb_ep->dma;
789 /* In case first packet is short */
790 if (len < musb_ep->packet_sz)
791 transfer_size = len;
792 else if (request->short_not_ok)
793 transfer_size = min(request->length -
794 request->actual,
795 channel->max_len);
796 else
797 transfer_size = min(request->length -
798 request->actual,
799 (unsigned)len);
801 csr &= ~MUSB_RXCSR_DMAMODE;
802 csr |= (MUSB_RXCSR_DMAENAB |
803 MUSB_RXCSR_AUTOCLEAR);
805 musb_writew(epio, MUSB_RXCSR, csr);
807 if (transfer_size <= musb_ep->packet_sz) {
808 musb_ep->dma->desired_mode = 0;
809 } else {
810 musb_ep->dma->desired_mode = 1;
811 /* Mode must be set after DMAENAB */
812 csr |= MUSB_RXCSR_DMAMODE;
813 musb_writew(epio, MUSB_RXCSR, csr);
814 }
816 if (c->channel_program(channel,
817 musb_ep->packet_sz,
818 channel->desired_mode,
819 request->dma
820 + request->actual,
821 transfer_size))
823 return;
824 }
825 #endif /* Mentor's DMA */
827 fifo_count = request->length - request->actual;
828 dev_dbg(musb->controller, "%s OUT/RX pio fifo %d/%d, maxpacket %d\n",
829 musb_ep->end_point.name,
830 len, fifo_count,
831 musb_ep->packet_sz);
833 fifo_count = min_t(unsigned, len, fifo_count);
835 #ifdef CONFIG_USB_TUSB_OMAP_DMA
836 if (tusb_dma_omap() && is_buffer_mapped(req)) {
837 struct dma_controller *c = musb->dma_controller;
838 struct dma_channel *channel = musb_ep->dma;
839 u32 dma_addr = request->dma + request->actual;
840 int ret;
842 ret = c->channel_program(channel,
843 musb_ep->packet_sz,
844 channel->desired_mode,
845 dma_addr,
846 fifo_count);
847 if (ret)
848 return;
849 }
850 #endif
851 /*
852 * Unmap the dma buffer back to cpu if dma channel
853 * programming fails. This buffer is mapped if the
854 * channel allocation is successful
855 */
856 if (is_buffer_mapped(req)) {
857 unmap_dma_buffer(req, musb);
859 /*
860 * Clear DMAENAB and AUTOCLEAR for the
861 * PIO mode transfer
862 */
863 csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR);
864 musb_writew(epio, MUSB_RXCSR, csr);
865 }
867 musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *)
868 (request->buf + request->actual));
869 request->actual += fifo_count;
871 /* REVISIT if we left anything in the fifo, flush
872 * it and report -EOVERFLOW
873 */
875 /* ack the read! */
876 csr |= MUSB_RXCSR_P_WZC_BITS;
877 csr &= ~MUSB_RXCSR_RXPKTRDY;
878 musb_writew(epio, MUSB_RXCSR, csr);
879 }
880 }
882 /* reach the end or short packet detected */
883 if (request->actual == request->length || len < musb_ep->packet_sz)
884 musb_g_giveback(musb_ep, request, 0);
885 }
887 /*
888 * Data ready for a request; called from IRQ
889 */
890 void musb_g_rx(struct musb *musb, u8 epnum)
891 {
892 u16 csr;
893 struct musb_request *req;
894 struct usb_request *request;
895 void __iomem *mbase = musb->mregs;
896 struct musb_ep *musb_ep;
897 void __iomem *epio = musb->endpoints[epnum].regs;
898 struct dma_channel *dma;
899 struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
901 if (hw_ep->is_shared_fifo)
902 musb_ep = &hw_ep->ep_in;
903 else
904 musb_ep = &hw_ep->ep_out;
906 musb_ep_select(mbase, epnum);
908 req = next_request(musb_ep);
909 if (!req)
910 return;
912 request = &req->request;
914 csr = musb_readw(epio, MUSB_RXCSR);
915 dma = is_dma_capable() ? musb_ep->dma : NULL;
917 dev_dbg(musb->controller, "<== %s, rxcsr %04x%s %p\n", musb_ep->end_point.name,
918 csr, dma ? " (dma)" : "", request);
920 if (csr & MUSB_RXCSR_P_SENTSTALL) {
921 csr |= MUSB_RXCSR_P_WZC_BITS;
922 csr &= ~MUSB_RXCSR_P_SENTSTALL;
923 musb_writew(epio, MUSB_RXCSR, csr);
924 return;
925 }
927 if (csr & MUSB_RXCSR_P_OVERRUN) {
928 /* csr |= MUSB_RXCSR_P_WZC_BITS; */
929 csr &= ~MUSB_RXCSR_P_OVERRUN;
930 musb_writew(epio, MUSB_RXCSR, csr);
932 dev_dbg(musb->controller, "%s iso overrun on %p\n", musb_ep->name, request);
933 if (request->status == -EINPROGRESS)
934 request->status = -EOVERFLOW;
935 }
936 if (csr & MUSB_RXCSR_INCOMPRX) {
937 /* REVISIT not necessarily an error */
938 dev_dbg(musb->controller, "%s, incomprx\n", musb_ep->end_point.name);
939 }
941 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
942 /* "should not happen"; likely RXPKTRDY pending for DMA */
943 dev_dbg(musb->controller, "%s busy, csr %04x\n",
944 musb_ep->end_point.name, csr);
945 return;
946 }
948 if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
949 csr &= ~(MUSB_RXCSR_AUTOCLEAR
950 | MUSB_RXCSR_DMAENAB
951 | MUSB_RXCSR_DMAMODE);
952 musb_writew(epio, MUSB_RXCSR,
953 MUSB_RXCSR_P_WZC_BITS | csr);
955 request->actual += musb_ep->dma->actual_len;
957 dev_dbg(musb->controller, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n",
958 epnum, csr,
959 musb_readw(epio, MUSB_RXCSR),
960 musb_ep->dma->actual_len, request);
962 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
963 defined(CONFIG_USB_UX500_DMA)
964 /* Autoclear doesn't clear RxPktRdy for short packets */
965 if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered)
966 || (dma->actual_len
967 & (musb_ep->packet_sz - 1))) {
968 /* ack the read! */
969 csr &= ~MUSB_RXCSR_RXPKTRDY;
970 musb_writew(epio, MUSB_RXCSR, csr);
971 }
973 /* incomplete, and not short? wait for next IN packet */
974 if ((request->actual < request->length)
975 && (musb_ep->dma->actual_len
976 == musb_ep->packet_sz)) {
977 /* In double buffer case, continue to unload fifo if
978 * there is Rx packet in FIFO.
979 **/
980 csr = musb_readw(epio, MUSB_RXCSR);
981 if ((csr & MUSB_RXCSR_RXPKTRDY) &&
982 hw_ep->rx_double_buffered)
983 goto exit;
984 return;
985 }
986 #endif
987 musb_g_giveback(musb_ep, request, 0);
989 req = next_request(musb_ep);
990 if (!req)
991 return;
992 }
993 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
994 defined(CONFIG_USB_UX500_DMA)
995 exit:
996 #endif
997 /* Analyze request */
998 rxstate(musb, req);
999 }
1001 /* ------------------------------------------------------------ */
1003 static int musb_gadget_enable(struct usb_ep *ep,
1004 const struct usb_endpoint_descriptor *desc)
1005 {
1006 unsigned long flags;
1007 struct musb_ep *musb_ep;
1008 struct musb_hw_ep *hw_ep;
1009 void __iomem *regs;
1010 struct musb *musb;
1011 void __iomem *mbase;
1012 u8 epnum;
1013 u16 csr;
1014 unsigned tmp;
1015 int status = -EINVAL;
1017 if (!ep || !desc)
1018 return -EINVAL;
1020 musb_ep = to_musb_ep(ep);
1021 hw_ep = musb_ep->hw_ep;
1022 regs = hw_ep->regs;
1023 musb = musb_ep->musb;
1024 mbase = musb->mregs;
1025 epnum = musb_ep->current_epnum;
1027 spin_lock_irqsave(&musb->lock, flags);
1029 if (musb_ep->desc) {
1030 status = -EBUSY;
1031 goto fail;
1032 }
1033 musb_ep->type = usb_endpoint_type(desc);
1035 /* check direction and (later) maxpacket size against endpoint */
1036 if (usb_endpoint_num(desc) != epnum)
1037 goto fail;
1039 /* REVISIT this rules out high bandwidth periodic transfers */
1040 tmp = usb_endpoint_maxp(desc);
1041 if (tmp & ~0x07ff) {
1042 int ok;
1044 if (usb_endpoint_dir_in(desc))
1045 ok = musb->hb_iso_tx;
1046 else
1047 ok = musb->hb_iso_rx;
1049 if (!ok) {
1050 dev_dbg(musb->controller, "no support for high bandwidth ISO\n");
1051 goto fail;
1052 }
1053 musb_ep->hb_mult = (tmp >> 11) & 3;
1054 } else {
1055 musb_ep->hb_mult = 0;
1056 }
1058 musb_ep->packet_sz = tmp & 0x7ff;
1059 tmp = musb_ep->packet_sz * (musb_ep->hb_mult + 1);
1061 /* enable the interrupts for the endpoint, set the endpoint
1062 * packet size (or fail), set the mode, clear the fifo
1063 */
1064 musb_ep_select(mbase, epnum);
1065 if (usb_endpoint_dir_in(desc)) {
1066 u16 int_txe = musb_readw(mbase, MUSB_INTRTXE);
1068 if (hw_ep->is_shared_fifo)
1069 musb_ep->is_in = 1;
1070 if (!musb_ep->is_in)
1071 goto fail;
1073 if (tmp > hw_ep->max_packet_sz_tx) {
1074 dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
1075 goto fail;
1076 }
1078 int_txe |= (1 << epnum);
1079 musb_writew(mbase, MUSB_INTRTXE, int_txe);
1081 /* REVISIT if can_bulk_split(), use by updating "tmp";
1082 * likewise high bandwidth periodic tx
1083 */
1084 /* Set TXMAXP with the FIFO size of the endpoint
1085 * to disable double buffering mode.
1086 */
1087 if (musb->double_buffer_not_ok)
1088 musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx);
1089 else
1090 musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz
1091 | (musb_ep->hb_mult << 11));
1093 csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG;
1094 if (musb_readw(regs, MUSB_TXCSR)
1095 & MUSB_TXCSR_FIFONOTEMPTY)
1096 csr |= MUSB_TXCSR_FLUSHFIFO;
1097 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
1098 csr |= MUSB_TXCSR_P_ISO;
1100 /* set twice in case of double buffering */
1101 musb_writew(regs, MUSB_TXCSR, csr);
1102 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1103 musb_writew(regs, MUSB_TXCSR, csr);
1105 } else {
1106 u16 int_rxe = musb_readw(mbase, MUSB_INTRRXE);
1108 if (hw_ep->is_shared_fifo)
1109 musb_ep->is_in = 0;
1110 if (musb_ep->is_in)
1111 goto fail;
1113 if (tmp > hw_ep->max_packet_sz_rx) {
1114 dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
1115 goto fail;
1116 }
1118 int_rxe |= (1 << epnum);
1119 musb_writew(mbase, MUSB_INTRRXE, int_rxe);
1121 /* REVISIT if can_bulk_combine() use by updating "tmp"
1122 * likewise high bandwidth periodic rx
1123 */
1124 /* Set RXMAXP with the FIFO size of the endpoint
1125 * to disable double buffering mode.
1126 */
1127 if (musb->double_buffer_not_ok)
1128 musb_writew(regs, MUSB_RXMAXP, hw_ep->max_packet_sz_tx);
1129 else
1130 musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz
1131 | (musb_ep->hb_mult << 11));
1133 /* force shared fifo to OUT-only mode */
1134 if (hw_ep->is_shared_fifo) {
1135 csr = musb_readw(regs, MUSB_TXCSR);
1136 csr &= ~(MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY);
1137 musb_writew(regs, MUSB_TXCSR, csr);
1138 }
1140 csr = MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_CLRDATATOG;
1141 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
1142 csr |= MUSB_RXCSR_P_ISO;
1143 else if (musb_ep->type == USB_ENDPOINT_XFER_INT)
1144 csr |= MUSB_RXCSR_DISNYET;
1146 /* set twice in case of double buffering */
1147 musb_writew(regs, MUSB_RXCSR, csr);
1148 musb_writew(regs, MUSB_RXCSR, csr);
1149 }
1151 /* NOTE: all the I/O code _should_ work fine without DMA, in case
1152 * for some reason you run out of channels here.
1153 */
1154 if (is_dma_capable() && musb->dma_controller) {
1155 struct dma_controller *c = musb->dma_controller;
1157 musb_ep->dma = c->channel_alloc(c, hw_ep,
1158 (desc->bEndpointAddress & USB_DIR_IN));
1159 } else
1160 musb_ep->dma = NULL;
1162 musb_ep->desc = desc;
1163 musb_ep->busy = 0;
1164 musb_ep->wedged = 0;
1165 status = 0;
1167 pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n",
1168 musb_driver_name, musb_ep->end_point.name,
1169 ({ char *s; switch (musb_ep->type) {
1170 case USB_ENDPOINT_XFER_BULK: s = "bulk"; break;
1171 case USB_ENDPOINT_XFER_INT: s = "int"; break;
1172 default: s = "iso"; break;
1173 }; s; }),
1174 musb_ep->is_in ? "IN" : "OUT",
1175 musb_ep->dma ? "dma, " : "",
1176 musb_ep->packet_sz);
1178 schedule_work(&musb->irq_work);
1180 fail:
1181 spin_unlock_irqrestore(&musb->lock, flags);
1182 return status;
1183 }
1185 /*
1186 * Disable an endpoint flushing all requests queued.
1187 */
1188 static int musb_gadget_disable(struct usb_ep *ep)
1189 {
1190 unsigned long flags;
1191 struct musb *musb;
1192 u8 epnum;
1193 struct musb_ep *musb_ep;
1194 void __iomem *epio;
1195 int status = 0;
1197 musb_ep = to_musb_ep(ep);
1198 musb = musb_ep->musb;
1199 epnum = musb_ep->current_epnum;
1200 epio = musb->endpoints[epnum].regs;
1202 spin_lock_irqsave(&musb->lock, flags);
1203 musb_ep_select(musb->mregs, epnum);
1205 /* zero the endpoint sizes */
1206 if (musb_ep->is_in) {
1207 u16 int_txe = musb_readw(musb->mregs, MUSB_INTRTXE);
1208 int_txe &= ~(1 << epnum);
1209 musb_writew(musb->mregs, MUSB_INTRTXE, int_txe);
1210 musb_writew(epio, MUSB_TXMAXP, 0);
1211 } else {
1212 u16 int_rxe = musb_readw(musb->mregs, MUSB_INTRRXE);
1213 int_rxe &= ~(1 << epnum);
1214 musb_writew(musb->mregs, MUSB_INTRRXE, int_rxe);
1215 musb_writew(epio, MUSB_RXMAXP, 0);
1216 }
1218 musb_ep->desc = NULL;
1220 /* abort all pending DMA and requests */
1221 nuke(musb_ep, -ESHUTDOWN);
1223 schedule_work(&musb->irq_work);
1225 spin_unlock_irqrestore(&(musb->lock), flags);
1227 dev_dbg(musb->controller, "%s\n", musb_ep->end_point.name);
1229 return status;
1230 }
1232 /*
1233 * Allocate a request for an endpoint.
1234 * Reused by ep0 code.
1235 */
1236 struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1237 {
1238 struct musb_ep *musb_ep = to_musb_ep(ep);
1239 struct musb *musb = musb_ep->musb;
1240 struct musb_request *request = NULL;
1242 request = kzalloc(sizeof *request, gfp_flags);
1243 if (!request) {
1244 dev_dbg(musb->controller, "not enough memory\n");
1245 return NULL;
1246 }
1248 request->request.dma = DMA_ADDR_INVALID;
1249 request->epnum = musb_ep->current_epnum;
1250 request->ep = musb_ep;
1252 return &request->request;
1253 }
1255 /*
1256 * Free a request
1257 * Reused by ep0 code.
1258 */
1259 void musb_free_request(struct usb_ep *ep, struct usb_request *req)
1260 {
1261 kfree(to_musb_request(req));
1262 }
1264 static LIST_HEAD(buffers);
1266 struct free_record {
1267 struct list_head list;
1268 struct device *dev;
1269 unsigned bytes;
1270 dma_addr_t dma;
1271 };
1273 /*
1274 * Context: controller locked, IRQs blocked.
1275 */
1276 void musb_ep_restart(struct musb *musb, struct musb_request *req)
1277 {
1278 dev_dbg(musb->controller, "<== %s request %p len %u on hw_ep%d\n",
1279 req->tx ? "TX/IN" : "RX/OUT",
1280 &req->request, req->request.length, req->epnum);
1282 musb_ep_select(musb->mregs, req->epnum);
1283 if (req->tx)
1284 txstate(musb, req);
1285 else
1286 rxstate(musb, req);
1287 }
1289 static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req,
1290 gfp_t gfp_flags)
1291 {
1292 struct musb_ep *musb_ep;
1293 struct musb_request *request;
1294 struct musb *musb;
1295 int status = 0;
1296 unsigned long lockflags;
1298 if (!ep || !req)
1299 return -EINVAL;
1300 if (!req->buf)
1301 return -ENODATA;
1303 musb_ep = to_musb_ep(ep);
1304 musb = musb_ep->musb;
1306 request = to_musb_request(req);
1307 request->musb = musb;
1309 if (request->ep != musb_ep)
1310 return -EINVAL;
1312 dev_dbg(musb->controller, "<== to %s request=%p\n", ep->name, req);
1314 /* request is mine now... */
1315 request->request.actual = 0;
1316 request->request.status = -EINPROGRESS;
1317 request->epnum = musb_ep->current_epnum;
1318 request->tx = musb_ep->is_in;
1320 map_dma_buffer(request, musb, musb_ep);
1322 spin_lock_irqsave(&musb->lock, lockflags);
1324 /* don't queue if the ep is down */
1325 if (!musb_ep->desc) {
1326 dev_dbg(musb->controller, "req %p queued to %s while ep %s\n",
1327 req, ep->name, "disabled");
1328 status = -ESHUTDOWN;
1329 goto cleanup;
1330 }
1332 /* add request to the list */
1333 list_add_tail(&request->list, &musb_ep->req_list);
1335 /* it this is the head of the queue, start i/o ... */
1336 if (!musb_ep->busy && &request->list == musb_ep->req_list.next)
1337 musb_ep_restart(musb, request);
1339 cleanup:
1340 spin_unlock_irqrestore(&musb->lock, lockflags);
1341 return status;
1342 }
1344 static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request)
1345 {
1346 struct musb_ep *musb_ep = to_musb_ep(ep);
1347 struct musb_request *req = to_musb_request(request);
1348 struct musb_request *r;
1349 unsigned long flags;
1350 int status = 0;
1351 struct musb *musb = musb_ep->musb;
1353 if (!ep || !request || to_musb_request(request)->ep != musb_ep)
1354 return -EINVAL;
1356 spin_lock_irqsave(&musb->lock, flags);
1358 list_for_each_entry(r, &musb_ep->req_list, list) {
1359 if (r == req)
1360 break;
1361 }
1362 if (r != req) {
1363 dev_dbg(musb->controller, "request %p not queued to %s\n", request, ep->name);
1364 status = -EINVAL;
1365 goto done;
1366 }
1368 /* if the hardware doesn't have the request, easy ... */
1369 if (musb_ep->req_list.next != &req->list || musb_ep->busy)
1370 musb_g_giveback(musb_ep, request, -ECONNRESET);
1372 /* ... else abort the dma transfer ... */
1373 else if (is_dma_capable() && musb_ep->dma) {
1374 struct dma_controller *c = musb->dma_controller;
1376 musb_ep_select(musb->mregs, musb_ep->current_epnum);
1377 if (c->channel_abort)
1378 status = c->channel_abort(musb_ep->dma);
1379 else
1380 status = -EBUSY;
1381 if (status == 0)
1382 musb_g_giveback(musb_ep, request, -ECONNRESET);
1383 } else {
1384 /* NOTE: by sticking to easily tested hardware/driver states,
1385 * we leave counting of in-flight packets imprecise.
1386 */
1387 musb_g_giveback(musb_ep, request, -ECONNRESET);
1388 }
1390 done:
1391 spin_unlock_irqrestore(&musb->lock, flags);
1392 return status;
1393 }
1395 /*
1396 * Set or clear the halt bit of an endpoint. A halted enpoint won't tx/rx any
1397 * data but will queue requests.
1398 *
1399 * exported to ep0 code
1400 */
1401 static int musb_gadget_set_halt(struct usb_ep *ep, int value)
1402 {
1403 struct musb_ep *musb_ep = to_musb_ep(ep);
1404 u8 epnum = musb_ep->current_epnum;
1405 struct musb *musb = musb_ep->musb;
1406 void __iomem *epio = musb->endpoints[epnum].regs;
1407 void __iomem *mbase;
1408 unsigned long flags;
1409 u16 csr;
1410 struct musb_request *request;
1411 int status = 0;
1413 if (!ep)
1414 return -EINVAL;
1415 mbase = musb->mregs;
1417 spin_lock_irqsave(&musb->lock, flags);
1419 if ((USB_ENDPOINT_XFER_ISOC == musb_ep->type)) {
1420 status = -EINVAL;
1421 goto done;
1422 }
1424 musb_ep_select(mbase, epnum);
1426 request = next_request(musb_ep);
1427 if (value) {
1428 if (request) {
1429 dev_dbg(musb->controller, "request in progress, cannot halt %s\n",
1430 ep->name);
1431 status = -EAGAIN;
1432 goto done;
1433 }
1434 /* Cannot portably stall with non-empty FIFO */
1435 if (musb_ep->is_in) {
1436 csr = musb_readw(epio, MUSB_TXCSR);
1437 if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
1438 dev_dbg(musb->controller, "FIFO busy, cannot halt %s\n", ep->name);
1439 status = -EAGAIN;
1440 goto done;
1441 }
1442 }
1443 } else
1444 musb_ep->wedged = 0;
1446 /* set/clear the stall and toggle bits */
1447 dev_dbg(musb->controller, "%s: %s stall\n", ep->name, value ? "set" : "clear");
1448 if (musb_ep->is_in) {
1449 csr = musb_readw(epio, MUSB_TXCSR);
1450 csr |= MUSB_TXCSR_P_WZC_BITS
1451 | MUSB_TXCSR_CLRDATATOG;
1452 if (value)
1453 csr |= MUSB_TXCSR_P_SENDSTALL;
1454 else
1455 csr &= ~(MUSB_TXCSR_P_SENDSTALL
1456 | MUSB_TXCSR_P_SENTSTALL);
1457 csr &= ~MUSB_TXCSR_TXPKTRDY;
1458 musb_writew(epio, MUSB_TXCSR, csr);
1459 } else {
1460 csr = musb_readw(epio, MUSB_RXCSR);
1461 csr |= MUSB_RXCSR_P_WZC_BITS
1462 | MUSB_RXCSR_FLUSHFIFO
1463 | MUSB_RXCSR_CLRDATATOG;
1464 if (value)
1465 csr |= MUSB_RXCSR_P_SENDSTALL;
1466 else
1467 csr &= ~(MUSB_RXCSR_P_SENDSTALL
1468 | MUSB_RXCSR_P_SENTSTALL);
1469 musb_writew(epio, MUSB_RXCSR, csr);
1470 }
1472 /* maybe start the first request in the queue */
1473 if (!musb_ep->busy && !value && request) {
1474 dev_dbg(musb->controller, "restarting the request\n");
1475 musb_ep_restart(musb, request);
1476 }
1478 done:
1479 spin_unlock_irqrestore(&musb->lock, flags);
1480 return status;
1481 }
1483 /*
1484 * Sets the halt feature with the clear requests ignored
1485 */
1486 static int musb_gadget_set_wedge(struct usb_ep *ep)
1487 {
1488 struct musb_ep *musb_ep = to_musb_ep(ep);
1490 if (!ep)
1491 return -EINVAL;
1493 musb_ep->wedged = 1;
1495 return usb_ep_set_halt(ep);
1496 }
1498 static int musb_gadget_fifo_status(struct usb_ep *ep)
1499 {
1500 struct musb_ep *musb_ep = to_musb_ep(ep);
1501 void __iomem *epio = musb_ep->hw_ep->regs;
1502 int retval = -EINVAL;
1504 if (musb_ep->desc && !musb_ep->is_in) {
1505 struct musb *musb = musb_ep->musb;
1506 int epnum = musb_ep->current_epnum;
1507 void __iomem *mbase = musb->mregs;
1508 unsigned long flags;
1510 spin_lock_irqsave(&musb->lock, flags);
1512 musb_ep_select(mbase, epnum);
1513 /* FIXME return zero unless RXPKTRDY is set */
1514 retval = musb_readw(epio, MUSB_RXCOUNT);
1516 spin_unlock_irqrestore(&musb->lock, flags);
1517 }
1518 return retval;
1519 }
1521 static void musb_gadget_fifo_flush(struct usb_ep *ep)
1522 {
1523 struct musb_ep *musb_ep = to_musb_ep(ep);
1524 struct musb *musb = musb_ep->musb;
1525 u8 epnum = musb_ep->current_epnum;
1526 void __iomem *epio = musb->endpoints[epnum].regs;
1527 void __iomem *mbase;
1528 unsigned long flags;
1529 u16 csr, int_txe;
1531 mbase = musb->mregs;
1533 spin_lock_irqsave(&musb->lock, flags);
1534 musb_ep_select(mbase, (u8) epnum);
1536 /* disable interrupts */
1537 int_txe = musb_readw(mbase, MUSB_INTRTXE);
1538 musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum));
1540 if (musb_ep->is_in) {
1541 csr = musb_readw(epio, MUSB_TXCSR);
1542 if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
1543 csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_P_WZC_BITS;
1544 /*
1545 * Setting both TXPKTRDY and FLUSHFIFO makes controller
1546 * to interrupt current FIFO loading, but not flushing
1547 * the already loaded ones.
1548 */
1549 csr &= ~MUSB_TXCSR_TXPKTRDY;
1550 musb_writew(epio, MUSB_TXCSR, csr);
1551 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1552 musb_writew(epio, MUSB_TXCSR, csr);
1553 }
1554 } else {
1555 csr = musb_readw(epio, MUSB_RXCSR);
1556 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_P_WZC_BITS;
1557 musb_writew(epio, MUSB_RXCSR, csr);
1558 musb_writew(epio, MUSB_RXCSR, csr);
1559 }
1561 /* re-enable interrupt */
1562 musb_writew(mbase, MUSB_INTRTXE, int_txe);
1563 spin_unlock_irqrestore(&musb->lock, flags);
1564 }
1566 static const struct usb_ep_ops musb_ep_ops = {
1567 .enable = musb_gadget_enable,
1568 .disable = musb_gadget_disable,
1569 .alloc_request = musb_alloc_request,
1570 .free_request = musb_free_request,
1571 .queue = musb_gadget_queue,
1572 .dequeue = musb_gadget_dequeue,
1573 .set_halt = musb_gadget_set_halt,
1574 .set_wedge = musb_gadget_set_wedge,
1575 .fifo_status = musb_gadget_fifo_status,
1576 .fifo_flush = musb_gadget_fifo_flush
1577 };
1579 /* ----------------------------------------------------------------------- */
1581 static int musb_gadget_get_frame(struct usb_gadget *gadget)
1582 {
1583 struct musb *musb = gadget_to_musb(gadget);
1585 return (int)musb_readw(musb->mregs, MUSB_FRAME);
1586 }
1588 static int musb_gadget_wakeup(struct usb_gadget *gadget)
1589 {
1590 struct musb *musb = gadget_to_musb(gadget);
1591 void __iomem *mregs = musb->mregs;
1592 unsigned long flags;
1593 int status = -EINVAL;
1594 u8 power, devctl;
1595 int retries;
1597 spin_lock_irqsave(&musb->lock, flags);
1599 switch (musb->xceiv->state) {
1600 case OTG_STATE_B_PERIPHERAL:
1601 /* NOTE: OTG state machine doesn't include B_SUSPENDED;
1602 * that's part of the standard usb 1.1 state machine, and
1603 * doesn't affect OTG transitions.
1604 */
1605 if (musb->may_wakeup && musb->is_suspended)
1606 break;
1607 goto done;
1608 case OTG_STATE_B_IDLE:
1609 /* Start SRP ... OTG not required. */
1610 devctl = musb_readb(mregs, MUSB_DEVCTL);
1611 dev_dbg(musb->controller, "Sending SRP: devctl: %02x\n", devctl);
1612 devctl |= MUSB_DEVCTL_SESSION;
1613 musb_writeb(mregs, MUSB_DEVCTL, devctl);
1614 devctl = musb_readb(mregs, MUSB_DEVCTL);
1615 retries = 100;
1616 while (!(devctl & MUSB_DEVCTL_SESSION)) {
1617 devctl = musb_readb(mregs, MUSB_DEVCTL);
1618 if (retries-- < 1)
1619 break;
1620 }
1621 retries = 10000;
1622 while (devctl & MUSB_DEVCTL_SESSION) {
1623 devctl = musb_readb(mregs, MUSB_DEVCTL);
1624 if (retries-- < 1)
1625 break;
1626 }
1628 spin_unlock_irqrestore(&musb->lock, flags);
1629 otg_start_srp(musb->xceiv);
1630 spin_lock_irqsave(&musb->lock, flags);
1632 /* Block idling for at least 1s */
1633 musb_platform_try_idle(musb,
1634 jiffies + msecs_to_jiffies(1 * HZ));
1636 status = 0;
1637 goto done;
1638 default:
1639 dev_dbg(musb->controller, "Unhandled wake: %s\n",
1640 otg_state_string(musb->xceiv->state));
1641 goto done;
1642 }
1644 status = 0;
1646 power = musb_readb(mregs, MUSB_POWER);
1647 power |= MUSB_POWER_RESUME;
1648 musb_writeb(mregs, MUSB_POWER, power);
1649 dev_dbg(musb->controller, "issue wakeup\n");
1651 /* FIXME do this next chunk in a timer callback, no udelay */
1652 mdelay(2);
1654 power = musb_readb(mregs, MUSB_POWER);
1655 power &= ~MUSB_POWER_RESUME;
1656 musb_writeb(mregs, MUSB_POWER, power);
1657 done:
1658 spin_unlock_irqrestore(&musb->lock, flags);
1659 return status;
1660 }
1662 static int
1663 musb_gadget_set_self_powered(struct usb_gadget *gadget, int is_selfpowered)
1664 {
1665 struct musb *musb = gadget_to_musb(gadget);
1667 musb->is_self_powered = !!is_selfpowered;
1668 return 0;
1669 }
1671 static void musb_pullup(struct musb *musb, int is_on)
1672 {
1673 u8 power;
1675 power = musb_readb(musb->mregs, MUSB_POWER);
1676 if (is_on)
1677 power |= MUSB_POWER_SOFTCONN;
1678 else
1679 power &= ~MUSB_POWER_SOFTCONN;
1681 /* FIXME if on, HdrcStart; if off, HdrcStop */
1683 dev_dbg(musb->controller, "gadget D+ pullup %s\n",
1684 is_on ? "on" : "off");
1685 musb_writeb(musb->mregs, MUSB_POWER, power);
1686 }
1688 #if 0
1689 static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active)
1690 {
1691 dev_dbg(musb->controller, "<= %s =>\n", __func__);
1693 /*
1694 * FIXME iff driver's softconnect flag is set (as it is during probe,
1695 * though that can clear it), just musb_pullup().
1696 */
1698 return -EINVAL;
1699 }
1700 #endif
1702 static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1703 {
1704 struct musb *musb = gadget_to_musb(gadget);
1706 if (!musb->xceiv->set_power)
1707 return -EOPNOTSUPP;
1708 return otg_set_power(musb->xceiv, mA);
1709 }
1711 static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on)
1712 {
1713 struct musb *musb = gadget_to_musb(gadget);
1714 unsigned long flags;
1716 is_on = !!is_on;
1718 pm_runtime_get_sync(musb->controller);
1720 /* NOTE: this assumes we are sensing vbus; we'd rather
1721 * not pullup unless the B-session is active.
1722 */
1723 spin_lock_irqsave(&musb->lock, flags);
1724 if (is_on != musb->softconnect) {
1725 musb->softconnect = is_on;
1726 musb_pullup(musb, is_on);
1727 }
1728 spin_unlock_irqrestore(&musb->lock, flags);
1730 pm_runtime_put(musb->controller);
1732 return 0;
1733 }
1735 static int musb_gadget_start(struct usb_gadget *g,
1736 struct usb_gadget_driver *driver);
1737 static int musb_gadget_stop(struct usb_gadget *g,
1738 struct usb_gadget_driver *driver);
1740 static const struct usb_gadget_ops musb_gadget_operations = {
1741 .get_frame = musb_gadget_get_frame,
1742 .wakeup = musb_gadget_wakeup,
1743 .set_selfpowered = musb_gadget_set_self_powered,
1744 /* .vbus_session = musb_gadget_vbus_session, */
1745 .vbus_draw = musb_gadget_vbus_draw,
1746 .pullup = musb_gadget_pullup,
1747 .udc_start = musb_gadget_start,
1748 .udc_stop = musb_gadget_stop,
1749 };
1751 /* ----------------------------------------------------------------------- */
1753 /* Registration */
1755 /* Only this registration code "knows" the rule (from USB standards)
1756 * about there being only one external upstream port. It assumes
1757 * all peripheral ports are external...
1758 */
1760 static void musb_gadget_release(struct device *dev)
1761 {
1762 /* kref_put(WHAT) */
1763 dev_dbg(dev, "%s\n", __func__);
1764 }
1767 static void __init
1768 init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in)
1769 {
1770 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1772 memset(ep, 0, sizeof *ep);
1774 ep->current_epnum = epnum;
1775 ep->musb = musb;
1776 ep->hw_ep = hw_ep;
1777 ep->is_in = is_in;
1779 INIT_LIST_HEAD(&ep->req_list);
1781 sprintf(ep->name, "ep%d%s", epnum,
1782 (!epnum || hw_ep->is_shared_fifo) ? "" : (
1783 is_in ? "in" : "out"));
1784 ep->end_point.name = ep->name;
1785 INIT_LIST_HEAD(&ep->end_point.ep_list);
1786 if (!epnum) {
1787 ep->end_point.maxpacket = 64;
1788 ep->end_point.ops = &musb_g_ep0_ops;
1789 musb->g.ep0 = &ep->end_point;
1790 } else {
1791 if (is_in)
1792 ep->end_point.maxpacket = hw_ep->max_packet_sz_tx;
1793 else
1794 ep->end_point.maxpacket = hw_ep->max_packet_sz_rx;
1795 ep->end_point.ops = &musb_ep_ops;
1796 list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list);
1797 }
1798 }
1800 /*
1801 * Initialize the endpoints exposed to peripheral drivers, with backlinks
1802 * to the rest of the driver state.
1803 */
1804 static inline void __init musb_g_init_endpoints(struct musb *musb)
1805 {
1806 u8 epnum;
1807 struct musb_hw_ep *hw_ep;
1808 unsigned count = 0;
1810 /* initialize endpoint list just once */
1811 INIT_LIST_HEAD(&(musb->g.ep_list));
1813 for (epnum = 0, hw_ep = musb->endpoints;
1814 epnum < musb->nr_endpoints;
1815 epnum++, hw_ep++) {
1816 if (hw_ep->is_shared_fifo /* || !epnum */) {
1817 init_peripheral_ep(musb, &hw_ep->ep_in, epnum, 0);
1818 count++;
1819 } else {
1820 if (hw_ep->max_packet_sz_tx) {
1821 init_peripheral_ep(musb, &hw_ep->ep_in,
1822 epnum, 1);
1823 count++;
1824 }
1825 if (hw_ep->max_packet_sz_rx) {
1826 init_peripheral_ep(musb, &hw_ep->ep_out,
1827 epnum, 0);
1828 count++;
1829 }
1830 }
1831 }
1832 }
1834 /* called once during driver setup to initialize and link into
1835 * the driver model; memory is zeroed.
1836 */
1837 int __init musb_gadget_setup(struct musb *musb)
1838 {
1839 int status;
1841 /* REVISIT minor race: if (erroneously) setting up two
1842 * musb peripherals at the same time, only the bus lock
1843 * is probably held.
1844 */
1846 musb->g.ops = &musb_gadget_operations;
1847 musb->g.is_dualspeed = 1;
1848 musb->g.speed = USB_SPEED_UNKNOWN;
1850 /* this "gadget" abstracts/virtualizes the controller */
1851 dev_set_name(&musb->g.dev, "gadget");
1852 musb->g.dev.parent = musb->controller;
1853 musb->g.dev.dma_mask = musb->controller->dma_mask;
1854 musb->g.dev.release = musb_gadget_release;
1855 musb->g.name = musb_driver_name;
1857 if (is_otg_enabled(musb))
1858 musb->g.is_otg = 1;
1860 musb_g_init_endpoints(musb);
1862 musb->is_active = 0;
1863 musb_platform_try_idle(musb, 0);
1865 status = device_register(&musb->g.dev);
1866 if (status != 0) {
1867 put_device(&musb->g.dev);
1868 return status;
1869 }
1870 status = usb_add_gadget_udc(musb->controller, &musb->g);
1871 if (status)
1872 goto err;
1874 return 0;
1875 err:
1876 musb->g.dev.parent = NULL;
1877 device_unregister(&musb->g.dev);
1878 return status;
1879 }
1881 void musb_gadget_cleanup(struct musb *musb)
1882 {
1883 usb_del_gadget_udc(&musb->g);
1884 if (musb->g.dev.parent)
1885 device_unregister(&musb->g.dev);
1886 }
1888 /*
1889 * Register the gadget driver. Used by gadget drivers when
1890 * registering themselves with the controller.
1891 *
1892 * -EINVAL something went wrong (not driver)
1893 * -EBUSY another gadget is already using the controller
1894 * -ENOMEM no memory to perform the operation
1895 *
1896 * @param driver the gadget driver
1897 * @return <0 if error, 0 if everything is fine
1898 */
1899 static int musb_gadget_start(struct usb_gadget *g,
1900 struct usb_gadget_driver *driver)
1901 {
1902 struct musb *musb = gadget_to_musb(g);
1903 unsigned long flags;
1904 int retval = -EINVAL;
1906 if (driver->speed < USB_SPEED_HIGH)
1907 goto err0;
1909 pm_runtime_get_sync(musb->controller);
1911 dev_dbg(musb->controller, "registering driver %s\n", driver->function);
1913 musb->softconnect = 0;
1914 musb->gadget_driver = driver;
1916 spin_lock_irqsave(&musb->lock, flags);
1917 musb->is_active = 1;
1919 otg_set_peripheral(musb->xceiv, &musb->g);
1920 musb->xceiv->state = OTG_STATE_B_IDLE;
1922 /*
1923 * FIXME this ignores the softconnect flag. Drivers are
1924 * allowed hold the peripheral inactive until for example
1925 * userspace hooks up printer hardware or DSP codecs, so
1926 * hosts only see fully functional devices.
1927 */
1929 if (!is_otg_enabled(musb))
1930 musb_start(musb);
1932 spin_unlock_irqrestore(&musb->lock, flags);
1934 if (is_otg_enabled(musb)) {
1935 struct usb_hcd *hcd = musb_to_hcd(musb);
1937 dev_dbg(musb->controller, "OTG startup...\n");
1939 /* REVISIT: funcall to other code, which also
1940 * handles power budgeting ... this way also
1941 * ensures HdrcStart is indirectly called.
1942 */
1943 retval = usb_add_hcd(musb_to_hcd(musb), -1, 0);
1944 if (retval < 0) {
1945 dev_dbg(musb->controller, "add_hcd failed, %d\n", retval);
1946 goto err2;
1947 }
1949 if ((musb->xceiv->last_event == USB_EVENT_ID)
1950 && musb->xceiv->set_vbus)
1951 otg_set_vbus(musb->xceiv, 1);
1953 hcd->self.uses_pio_for_control = 1;
1954 }
1955 if (musb->xceiv->last_event == USB_EVENT_NONE)
1956 pm_runtime_put(musb->controller);
1958 return 0;
1960 err2:
1961 if (!is_otg_enabled(musb))
1962 musb_stop(musb);
1963 err0:
1964 return retval;
1965 }
1967 static void stop_activity(struct musb *musb, struct usb_gadget_driver *driver)
1968 {
1969 int i;
1970 struct musb_hw_ep *hw_ep;
1972 /* don't disconnect if it's not connected */
1973 if (musb->g.speed == USB_SPEED_UNKNOWN)
1974 driver = NULL;
1975 else
1976 musb->g.speed = USB_SPEED_UNKNOWN;
1978 /* deactivate the hardware */
1979 if (musb->softconnect) {
1980 musb->softconnect = 0;
1981 musb_pullup(musb, 0);
1982 }
1983 musb_stop(musb);
1985 /* killing any outstanding requests will quiesce the driver;
1986 * then report disconnect
1987 */
1988 if (driver) {
1989 for (i = 0, hw_ep = musb->endpoints;
1990 i < musb->nr_endpoints;
1991 i++, hw_ep++) {
1992 musb_ep_select(musb->mregs, i);
1993 if (hw_ep->is_shared_fifo /* || !epnum */) {
1994 nuke(&hw_ep->ep_in, -ESHUTDOWN);
1995 } else {
1996 if (hw_ep->max_packet_sz_tx)
1997 nuke(&hw_ep->ep_in, -ESHUTDOWN);
1998 if (hw_ep->max_packet_sz_rx)
1999 nuke(&hw_ep->ep_out, -ESHUTDOWN);
2000 }
2001 }
2002 }
2003 }
2005 /*
2006 * Unregister the gadget driver. Used by gadget drivers when
2007 * unregistering themselves from the controller.
2008 *
2009 * @param driver the gadget driver to unregister
2010 */
2011 static int musb_gadget_stop(struct usb_gadget *g,
2012 struct usb_gadget_driver *driver)
2013 {
2014 struct musb *musb = gadget_to_musb(g);
2015 unsigned long flags;
2017 if (musb->xceiv->last_event == USB_EVENT_NONE)
2018 pm_runtime_get_sync(musb->controller);
2020 /*
2021 * REVISIT always use otg_set_peripheral() here too;
2022 * this needs to shut down the OTG engine.
2023 */
2025 spin_lock_irqsave(&musb->lock, flags);
2027 musb_hnp_stop(musb);
2029 (void) musb_gadget_vbus_draw(&musb->g, 0);
2031 musb->xceiv->state = OTG_STATE_UNDEFINED;
2032 stop_activity(musb, driver);
2033 otg_set_peripheral(musb->xceiv, NULL);
2035 dev_dbg(musb->controller, "unregistering driver %s\n", driver->function);
2037 musb->is_active = 0;
2038 musb_platform_try_idle(musb, 0);
2039 spin_unlock_irqrestore(&musb->lock, flags);
2041 if (is_otg_enabled(musb)) {
2042 usb_remove_hcd(musb_to_hcd(musb));
2043 /* FIXME we need to be able to register another
2044 * gadget driver here and have everything work;
2045 * that currently misbehaves.
2046 */
2047 }
2049 if (!is_otg_enabled(musb))
2050 musb_stop(musb);
2052 pm_runtime_put(musb->controller);
2054 return 0;
2055 }
2057 /* ----------------------------------------------------------------------- */
2059 /* lifecycle operations called through plat_uds.c */
2061 void musb_g_resume(struct musb *musb)
2062 {
2063 musb->is_suspended = 0;
2064 switch (musb->xceiv->state) {
2065 case OTG_STATE_B_IDLE:
2066 break;
2067 case OTG_STATE_B_WAIT_ACON:
2068 case OTG_STATE_B_PERIPHERAL:
2069 musb->is_active = 1;
2070 if (musb->gadget_driver && musb->gadget_driver->resume) {
2071 spin_unlock(&musb->lock);
2072 musb->gadget_driver->resume(&musb->g);
2073 spin_lock(&musb->lock);
2074 }
2075 break;
2076 default:
2077 WARNING("unhandled RESUME transition (%s)\n",
2078 otg_state_string(musb->xceiv->state));
2079 }
2080 }
2082 /* called when SOF packets stop for 3+ msec */
2083 void musb_g_suspend(struct musb *musb)
2084 {
2085 u8 devctl;
2087 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2088 dev_dbg(musb->controller, "devctl %02x\n", devctl);
2090 switch (musb->xceiv->state) {
2091 case OTG_STATE_B_IDLE:
2092 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2093 musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
2094 break;
2095 case OTG_STATE_B_PERIPHERAL:
2096 musb->is_suspended = 1;
2097 if (musb->gadget_driver && musb->gadget_driver->suspend) {
2098 spin_unlock(&musb->lock);
2099 musb->gadget_driver->suspend(&musb->g);
2100 spin_lock(&musb->lock);
2101 }
2102 break;
2103 default:
2104 /* REVISIT if B_HOST, clear DEVCTL.HOSTREQ;
2105 * A_PERIPHERAL may need care too
2106 */
2107 WARNING("unhandled SUSPEND transition (%s)\n",
2108 otg_state_string(musb->xceiv->state));
2109 }
2110 }
2112 /* Called during SRP */
2113 void musb_g_wakeup(struct musb *musb)
2114 {
2115 musb_gadget_wakeup(&musb->g);
2116 }
2118 /* called when VBUS drops below session threshold, and in other cases */
2119 void musb_g_disconnect(struct musb *musb)
2120 {
2121 void __iomem *mregs = musb->mregs;
2122 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
2124 dev_dbg(musb->controller, "devctl %02x\n", devctl);
2126 /* clear HR */
2127 musb_writeb(mregs, MUSB_DEVCTL, devctl & MUSB_DEVCTL_SESSION);
2129 /* don't draw vbus until new b-default session */
2130 (void) musb_gadget_vbus_draw(&musb->g, 0);
2132 musb->g.speed = USB_SPEED_UNKNOWN;
2133 if (musb->gadget_driver && musb->gadget_driver->disconnect) {
2134 spin_unlock(&musb->lock);
2135 musb->gadget_driver->disconnect(&musb->g);
2136 spin_lock(&musb->lock);
2137 }
2139 switch (musb->xceiv->state) {
2140 default:
2141 dev_dbg(musb->controller, "Unhandled disconnect %s, setting a_idle\n",
2142 otg_state_string(musb->xceiv->state));
2143 musb->xceiv->state = OTG_STATE_A_IDLE;
2144 MUSB_HST_MODE(musb);
2145 break;
2146 case OTG_STATE_A_PERIPHERAL:
2147 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
2148 MUSB_HST_MODE(musb);
2149 break;
2150 case OTG_STATE_B_WAIT_ACON:
2151 case OTG_STATE_B_HOST:
2152 case OTG_STATE_B_PERIPHERAL:
2153 case OTG_STATE_B_IDLE:
2154 musb->xceiv->state = OTG_STATE_B_IDLE;
2155 break;
2156 case OTG_STATE_B_SRP_INIT:
2157 break;
2158 }
2160 musb->is_active = 0;
2161 }
2163 void musb_g_reset(struct musb *musb)
2164 __releases(musb->lock)
2165 __acquires(musb->lock)
2166 {
2167 void __iomem *mbase = musb->mregs;
2168 u8 devctl = musb_readb(mbase, MUSB_DEVCTL);
2169 u8 power;
2171 dev_dbg(musb->controller, "<== %s addr=%x driver '%s'\n",
2172 (devctl & MUSB_DEVCTL_BDEVICE)
2173 ? "B-Device" : "A-Device",
2174 musb_readb(mbase, MUSB_FADDR),
2175 musb->gadget_driver
2176 ? musb->gadget_driver->driver.name
2177 : NULL
2178 );
2180 /* report disconnect, if we didn't already (flushing EP state) */
2181 if (musb->g.speed != USB_SPEED_UNKNOWN)
2182 musb_g_disconnect(musb);
2184 /* clear HR */
2185 else if (devctl & MUSB_DEVCTL_HR)
2186 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
2189 /* what speed did we negotiate? */
2190 power = musb_readb(mbase, MUSB_POWER);
2191 musb->g.speed = (power & MUSB_POWER_HSMODE)
2192 ? USB_SPEED_HIGH : USB_SPEED_FULL;
2194 /* start in USB_STATE_DEFAULT */
2195 musb->is_active = 1;
2196 musb->is_suspended = 0;
2197 MUSB_DEV_MODE(musb);
2198 musb->address = 0;
2199 musb->ep0_state = MUSB_EP0_STAGE_SETUP;
2201 musb->may_wakeup = 0;
2202 musb->g.b_hnp_enable = 0;
2203 musb->g.a_alt_hnp_support = 0;
2204 musb->g.a_hnp_support = 0;
2206 /* Normal reset, as B-Device;
2207 * or else after HNP, as A-Device
2208 */
2209 if (devctl & MUSB_DEVCTL_BDEVICE) {
2210 musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
2211 musb->g.is_a_peripheral = 0;
2212 } else if (is_otg_enabled(musb)) {
2213 musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
2214 musb->g.is_a_peripheral = 1;
2215 } else
2216 WARN_ON(1);
2218 /* start with default limits on VBUS power draw */
2219 (void) musb_gadget_vbus_draw(&musb->g,
2220 is_otg_enabled(musb) ? 8 : 100);
2221 }