2 * MUSB OTG driver peripheral support
4 * Copyright 2005 Mentor Graphics Corporation
5 * Copyright (C) 2005-2006 by Texas Instruments
6 * Copyright (C) 2006-2007 Nokia Corporation
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.
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.
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
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.
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/dma-mapping.h>
44 #include <linux/slab.h>
46 #include "musb_core.h"
49 /* ----------------------------------------------------------------------- */
51 #define is_buffer_mapped(req) (is_dma_capable() && \
52 (req->map_state != UN_MAPPED))
54 /* Maps the buffer to dma */
56 static inline void map_dma_buffer(struct musb_request *request,
57 struct musb *musb, struct musb_ep *musb_ep)
59 int compatible = true;
60 struct dma_controller *dma = musb->dma_controller;
62 request->map_state = UN_MAPPED;
64 if (!is_dma_capable() || !musb_ep->dma)
67 /* Check if DMA engine can handle this request.
68 * DMA code must reject the USB request explicitly.
69 * Default behaviour is to map the request.
71 if (dma->is_compatible)
72 compatible = dma->is_compatible(musb_ep->dma,
73 musb_ep->packet_sz, request->request.buf,
74 request->request.length);
78 if (request->request.dma == DMA_ADDR_INVALID) {
82 dma_addr = dma_map_single(
85 request->request.length,
89 ret = dma_mapping_error(musb->controller, dma_addr);
93 request->request.dma = dma_addr;
94 request->map_state = MUSB_MAPPED;
96 dma_sync_single_for_device(musb->controller,
98 request->request.length,
102 request->map_state = PRE_MAPPED;
106 /* Unmap the buffer from dma and maps it back to cpu */
107 static inline void unmap_dma_buffer(struct musb_request *request,
110 struct musb_ep *musb_ep = request->ep;
112 if (!is_buffer_mapped(request) || !musb_ep->dma)
115 if (request->request.dma == DMA_ADDR_INVALID) {
116 dev_vdbg(musb->controller,
117 "not unmapping a never mapped buffer\n");
120 if (request->map_state == MUSB_MAPPED) {
121 dma_unmap_single(musb->controller,
122 request->request.dma,
123 request->request.length,
127 request->request.dma = DMA_ADDR_INVALID;
128 } else { /* PRE_MAPPED */
129 dma_sync_single_for_cpu(musb->controller,
130 request->request.dma,
131 request->request.length,
136 request->map_state = UN_MAPPED;
140 * Immediately complete a request.
142 * @param request the request to complete
143 * @param status the status to complete the request with
144 * Context: controller locked, IRQs blocked.
146 void musb_g_giveback(
148 struct usb_request *request,
150 __releases(ep->musb->lock)
151 __acquires(ep->musb->lock)
153 struct musb_request *req;
157 req = to_musb_request(request);
159 list_del(&req->list);
160 if (req->request.status == -EINPROGRESS)
161 req->request.status = status;
165 spin_unlock(&musb->lock);
167 if (!dma_mapping_error(&musb->g.dev, request->dma))
168 unmap_dma_buffer(req, musb);
170 if (request->status == 0)
171 dev_dbg(musb->controller, "%s done request %p, %d/%d\n",
172 ep->end_point.name, request,
173 req->request.actual, req->request.length);
175 dev_dbg(musb->controller, "%s request %p, %d/%d fault %d\n",
176 ep->end_point.name, request,
177 req->request.actual, req->request.length,
179 usb_gadget_giveback_request(&req->ep->end_point, &req->request);
180 spin_lock(&musb->lock);
184 /* ----------------------------------------------------------------------- */
187 * Abort requests queued to an endpoint using the status. Synchronous.
188 * caller locked controller and blocked irqs, and selected this ep.
190 static void nuke(struct musb_ep *ep, const int status)
192 struct musb *musb = ep->musb;
193 struct musb_request *req = NULL;
194 void __iomem *epio = ep->musb->endpoints[ep->current_epnum].regs;
198 if (is_dma_capable() && ep->dma) {
199 struct dma_controller *c = ep->musb->dma_controller;
204 * The programming guide says that we must not clear
205 * the DMAMODE bit before DMAENAB, so we only
206 * clear it in the second write...
208 musb_writew(epio, MUSB_TXCSR,
209 MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO);
210 musb_writew(epio, MUSB_TXCSR,
211 0 | MUSB_TXCSR_FLUSHFIFO);
213 musb_writew(epio, MUSB_RXCSR,
214 0 | MUSB_RXCSR_FLUSHFIFO);
215 musb_writew(epio, MUSB_RXCSR,
216 0 | MUSB_RXCSR_FLUSHFIFO);
219 value = c->channel_abort(ep->dma);
220 dev_dbg(musb->controller, "%s: abort DMA --> %d\n",
222 c->channel_release(ep->dma);
226 while (!list_empty(&ep->req_list)) {
227 req = list_first_entry(&ep->req_list, struct musb_request, list);
228 musb_g_giveback(ep, &req->request, status);
232 /* ----------------------------------------------------------------------- */
234 /* Data transfers - pure PIO, pure DMA, or mixed mode */
237 * This assumes the separate CPPI engine is responding to DMA requests
238 * from the usb core ... sequenced a bit differently from mentor dma.
241 static inline int max_ep_writesize(struct musb *musb, struct musb_ep *ep)
243 if (can_bulk_split(musb, ep->type))
244 return ep->hw_ep->max_packet_sz_tx;
246 return ep->packet_sz;
250 * An endpoint is transmitting data. This can be called either from
251 * the IRQ routine or from ep.queue() to kickstart a request on an
254 * Context: controller locked, IRQs blocked, endpoint selected
256 static void txstate(struct musb *musb, struct musb_request *req)
258 u8 epnum = req->epnum;
259 struct musb_ep *musb_ep;
260 void __iomem *epio = musb->endpoints[epnum].regs;
261 struct usb_request *request;
262 u16 fifo_count = 0, csr;
267 /* Check if EP is disabled */
268 if (!musb_ep->desc) {
269 dev_dbg(musb->controller, "ep:%s disabled - ignore request\n",
270 musb_ep->end_point.name);
274 /* we shouldn't get here while DMA is active ... but we do ... */
275 if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
276 dev_dbg(musb->controller, "dma pending...\n");
280 /* read TXCSR before */
281 csr = musb_readw(epio, MUSB_TXCSR);
283 request = &req->request;
284 fifo_count = min(max_ep_writesize(musb, musb_ep),
285 (int)(request->length - request->actual));
287 if (csr & MUSB_TXCSR_TXPKTRDY) {
288 dev_dbg(musb->controller, "%s old packet still ready , txcsr %03x\n",
289 musb_ep->end_point.name, csr);
293 if (csr & MUSB_TXCSR_P_SENDSTALL) {
294 dev_dbg(musb->controller, "%s stalling, txcsr %03x\n",
295 musb_ep->end_point.name, csr);
299 dev_dbg(musb->controller, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x\n",
300 epnum, musb_ep->packet_sz, fifo_count,
303 #ifndef CONFIG_MUSB_PIO_ONLY
304 if (is_buffer_mapped(req)) {
305 struct dma_controller *c = musb->dma_controller;
308 /* setup DMA, then program endpoint CSR */
309 request_size = min_t(size_t, request->length - request->actual,
310 musb_ep->dma->max_len);
312 use_dma = (request->dma != DMA_ADDR_INVALID && request_size);
314 /* MUSB_TXCSR_P_ISO is still set correctly */
316 if (musb_dma_inventra(musb) || musb_dma_ux500(musb)) {
317 if (request_size < musb_ep->packet_sz)
318 musb_ep->dma->desired_mode = 0;
320 musb_ep->dma->desired_mode = 1;
322 use_dma = use_dma && c->channel_program(
323 musb_ep->dma, musb_ep->packet_sz,
324 musb_ep->dma->desired_mode,
325 request->dma + request->actual, request_size);
327 if (musb_ep->dma->desired_mode == 0) {
329 * We must not clear the DMAMODE bit
330 * before the DMAENAB bit -- and the
331 * latter doesn't always get cleared
332 * before we get here...
334 csr &= ~(MUSB_TXCSR_AUTOSET
335 | MUSB_TXCSR_DMAENAB);
336 musb_writew(epio, MUSB_TXCSR, csr
337 | MUSB_TXCSR_P_WZC_BITS);
338 csr &= ~MUSB_TXCSR_DMAMODE;
339 csr |= (MUSB_TXCSR_DMAENAB |
341 /* against programming guide */
343 csr |= (MUSB_TXCSR_DMAENAB
347 * Enable Autoset according to table
349 * bulk_split hb_mult Autoset_Enable
351 * 0 >0 No(High BW ISO)
355 if (!musb_ep->hb_mult ||
358 csr |= MUSB_TXCSR_AUTOSET;
360 csr &= ~MUSB_TXCSR_P_UNDERRUN;
362 musb_writew(epio, MUSB_TXCSR, csr);
366 if (is_cppi_enabled(musb)) {
367 /* program endpoint CSR first, then setup DMA */
368 csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
369 csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE |
371 musb_writew(epio, MUSB_TXCSR, (MUSB_TXCSR_P_WZC_BITS &
372 ~MUSB_TXCSR_P_UNDERRUN) | csr);
374 /* ensure writebuffer is empty */
375 csr = musb_readw(epio, MUSB_TXCSR);
378 * NOTE host side sets DMAENAB later than this; both are
379 * OK since the transfer dma glue (between CPPI and
380 * Mentor fifos) just tells CPPI it could start. Data
381 * only moves to the USB TX fifo when both fifos are
385 * "mode" is irrelevant here; handle terminating ZLPs
386 * like PIO does, since the hardware RNDIS mode seems
387 * unreliable except for the
388 * last-packet-is-already-short case.
390 use_dma = use_dma && c->channel_program(
391 musb_ep->dma, musb_ep->packet_sz,
393 request->dma + request->actual,
396 c->channel_release(musb_ep->dma);
398 csr &= ~MUSB_TXCSR_DMAENAB;
399 musb_writew(epio, MUSB_TXCSR, csr);
400 /* invariant: prequest->buf is non-null */
402 } else if (tusb_dma_omap(musb))
403 use_dma = use_dma && c->channel_program(
404 musb_ep->dma, musb_ep->packet_sz,
406 request->dma + request->actual,
413 * Unmap the dma buffer back to cpu if dma channel
416 unmap_dma_buffer(req, musb);
418 musb_write_fifo(musb_ep->hw_ep, fifo_count,
419 (u8 *) (request->buf + request->actual));
420 request->actual += fifo_count;
421 csr |= MUSB_TXCSR_TXPKTRDY;
422 csr &= ~MUSB_TXCSR_P_UNDERRUN;
423 musb_writew(epio, MUSB_TXCSR, csr);
426 /* host may already have the data when this message shows... */
427 dev_dbg(musb->controller, "%s TX/IN %s len %d/%d, txcsr %04x, fifo %d/%d\n",
428 musb_ep->end_point.name, use_dma ? "dma" : "pio",
429 request->actual, request->length,
430 musb_readw(epio, MUSB_TXCSR),
432 musb_readw(epio, MUSB_TXMAXP));
436 * FIFO state update (e.g. data ready).
437 * Called from IRQ, with controller locked.
439 void musb_g_tx(struct musb *musb, u8 epnum)
442 struct musb_request *req;
443 struct usb_request *request;
444 u8 __iomem *mbase = musb->mregs;
445 struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_in;
446 void __iomem *epio = musb->endpoints[epnum].regs;
447 struct dma_channel *dma;
449 musb_ep_select(mbase, epnum);
450 req = next_request(musb_ep);
451 request = &req->request;
453 csr = musb_readw(epio, MUSB_TXCSR);
454 dev_dbg(musb->controller, "<== %s, txcsr %04x\n", musb_ep->end_point.name, csr);
456 dma = is_dma_capable() ? musb_ep->dma : NULL;
459 * REVISIT: for high bandwidth, MUSB_TXCSR_P_INCOMPTX
460 * probably rates reporting as a host error.
462 if (csr & MUSB_TXCSR_P_SENTSTALL) {
463 csr |= MUSB_TXCSR_P_WZC_BITS;
464 csr &= ~MUSB_TXCSR_P_SENTSTALL;
465 musb_writew(epio, MUSB_TXCSR, csr);
469 if (csr & MUSB_TXCSR_P_UNDERRUN) {
470 /* We NAKed, no big deal... little reason to care. */
471 csr |= MUSB_TXCSR_P_WZC_BITS;
472 csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
473 musb_writew(epio, MUSB_TXCSR, csr);
474 dev_vdbg(musb->controller, "underrun on ep%d, req %p\n",
478 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
480 * SHOULD NOT HAPPEN... has with CPPI though, after
481 * changing SENDSTALL (and other cases); harmless?
483 dev_dbg(musb->controller, "%s dma still busy?\n", musb_ep->end_point.name);
489 bool short_packet = false;
491 if (dma && (csr & MUSB_TXCSR_DMAENAB)) {
493 csr |= MUSB_TXCSR_P_WZC_BITS;
494 csr &= ~(MUSB_TXCSR_DMAENAB | MUSB_TXCSR_P_UNDERRUN |
495 MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_AUTOSET);
496 musb_writew(epio, MUSB_TXCSR, csr);
497 /* Ensure writebuffer is empty. */
498 csr = musb_readw(epio, MUSB_TXCSR);
499 request->actual += musb_ep->dma->actual_len;
500 dev_dbg(musb->controller, "TXCSR%d %04x, DMA off, len %zu, req %p\n",
501 epnum, csr, musb_ep->dma->actual_len, request);
505 * First, maybe a terminating short packet. Some DMA
506 * engines might handle this by themselves.
508 if ((request->zero && request->length)
509 && (request->length % musb_ep->packet_sz == 0)
510 && (request->actual == request->length))
513 if ((musb_dma_inventra(musb) || musb_dma_ux500(musb)) &&
514 (is_dma && (!dma->desired_mode ||
516 (musb_ep->packet_sz - 1)))))
521 * On DMA completion, FIFO may not be
524 if (csr & MUSB_TXCSR_TXPKTRDY)
527 dev_dbg(musb->controller, "sending zero pkt\n");
528 musb_writew(epio, MUSB_TXCSR, MUSB_TXCSR_MODE
529 | MUSB_TXCSR_TXPKTRDY);
533 if (request->actual == request->length) {
534 musb_g_giveback(musb_ep, request, 0);
536 * In the giveback function the MUSB lock is
537 * released and acquired after sometime. During
538 * this time period the INDEX register could get
539 * changed by the gadget_queue function especially
540 * on SMP systems. Reselect the INDEX to be sure
541 * we are reading/modifying the right registers
543 musb_ep_select(mbase, epnum);
544 req = musb_ep->desc ? next_request(musb_ep) : NULL;
546 dev_dbg(musb->controller, "%s idle now\n",
547 musb_ep->end_point.name);
556 /* ------------------------------------------------------------ */
559 * Context: controller locked, IRQs blocked, endpoint selected
561 static void rxstate(struct musb *musb, struct musb_request *req)
563 const u8 epnum = req->epnum;
564 struct usb_request *request = &req->request;
565 struct musb_ep *musb_ep;
566 void __iomem *epio = musb->endpoints[epnum].regs;
569 u16 csr = musb_readw(epio, MUSB_RXCSR);
570 struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
573 if (hw_ep->is_shared_fifo)
574 musb_ep = &hw_ep->ep_in;
576 musb_ep = &hw_ep->ep_out;
578 fifo_count = musb_ep->packet_sz;
580 /* Check if EP is disabled */
581 if (!musb_ep->desc) {
582 dev_dbg(musb->controller, "ep:%s disabled - ignore request\n",
583 musb_ep->end_point.name);
587 /* We shouldn't get here while DMA is active, but we do... */
588 if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) {
589 dev_dbg(musb->controller, "DMA pending...\n");
593 if (csr & MUSB_RXCSR_P_SENDSTALL) {
594 dev_dbg(musb->controller, "%s stalling, RXCSR %04x\n",
595 musb_ep->end_point.name, csr);
599 if (is_cppi_enabled(musb) && is_buffer_mapped(req)) {
600 struct dma_controller *c = musb->dma_controller;
601 struct dma_channel *channel = musb_ep->dma;
603 /* NOTE: CPPI won't actually stop advancing the DMA
604 * queue after short packet transfers, so this is almost
605 * always going to run as IRQ-per-packet DMA so that
606 * faults will be handled correctly.
608 if (c->channel_program(channel,
610 !request->short_not_ok,
611 request->dma + request->actual,
612 request->length - request->actual)) {
614 /* make sure that if an rxpkt arrived after the irq,
615 * the cppi engine will be ready to take it as soon
618 csr &= ~(MUSB_RXCSR_AUTOCLEAR
619 | MUSB_RXCSR_DMAMODE);
620 csr |= MUSB_RXCSR_DMAENAB | MUSB_RXCSR_P_WZC_BITS;
621 musb_writew(epio, MUSB_RXCSR, csr);
626 if (csr & MUSB_RXCSR_RXPKTRDY) {
627 fifo_count = musb_readw(epio, MUSB_RXCOUNT);
630 * Enable Mode 1 on RX transfers only when short_not_ok flag
631 * is set. Currently short_not_ok flag is set only from
632 * file_storage and f_mass_storage drivers
635 if (request->short_not_ok && fifo_count == musb_ep->packet_sz)
640 if (request->actual < request->length) {
641 if (!is_buffer_mapped(req))
642 goto buffer_aint_mapped;
644 if (musb_dma_inventra(musb)) {
645 struct dma_controller *c;
646 struct dma_channel *channel;
648 unsigned int transfer_size;
650 c = musb->dma_controller;
651 channel = musb_ep->dma;
653 /* We use DMA Req mode 0 in rx_csr, and DMA controller operates in
654 * mode 0 only. So we do not get endpoint interrupts due to DMA
655 * completion. We only get interrupts from DMA controller.
657 * We could operate in DMA mode 1 if we knew the size of the tranfer
658 * in advance. For mass storage class, request->length = what the host
659 * sends, so that'd work. But for pretty much everything else,
660 * request->length is routinely more than what the host sends. For
661 * most these gadgets, end of is signified either by a short packet,
662 * or filling the last byte of the buffer. (Sending extra data in
663 * that last pckate should trigger an overflow fault.) But in mode 1,
664 * we don't get DMA completion interrupt for short packets.
666 * Theoretically, we could enable DMAReq irq (MUSB_RXCSR_DMAMODE = 1),
667 * to get endpoint interrupt on every DMA req, but that didn't seem
670 * REVISIT an updated g_file_storage can set req->short_not_ok, which
671 * then becomes usable as a runtime "use mode 1" hint...
674 /* Experimental: Mode1 works with mass storage use cases */
676 csr |= MUSB_RXCSR_AUTOCLEAR;
677 musb_writew(epio, MUSB_RXCSR, csr);
678 csr |= MUSB_RXCSR_DMAENAB;
679 musb_writew(epio, MUSB_RXCSR, csr);
682 * this special sequence (enabling and then
683 * disabling MUSB_RXCSR_DMAMODE) is required
684 * to get DMAReq to activate
686 musb_writew(epio, MUSB_RXCSR,
687 csr | MUSB_RXCSR_DMAMODE);
688 musb_writew(epio, MUSB_RXCSR, csr);
690 transfer_size = min_t(unsigned int,
694 musb_ep->dma->desired_mode = 1;
696 if (!musb_ep->hb_mult &&
697 musb_ep->hw_ep->rx_double_buffered)
698 csr |= MUSB_RXCSR_AUTOCLEAR;
699 csr |= MUSB_RXCSR_DMAENAB;
700 musb_writew(epio, MUSB_RXCSR, csr);
702 transfer_size = min(request->length - request->actual,
703 (unsigned)fifo_count);
704 musb_ep->dma->desired_mode = 0;
707 use_dma = c->channel_program(
710 channel->desired_mode,
719 if ((musb_dma_ux500(musb)) &&
720 (request->actual < request->length)) {
722 struct dma_controller *c;
723 struct dma_channel *channel;
724 unsigned int transfer_size = 0;
726 c = musb->dma_controller;
727 channel = musb_ep->dma;
729 /* In case first packet is short */
730 if (fifo_count < musb_ep->packet_sz)
731 transfer_size = fifo_count;
732 else if (request->short_not_ok)
733 transfer_size = min_t(unsigned int,
738 transfer_size = min_t(unsigned int,
741 (unsigned)fifo_count);
743 csr &= ~MUSB_RXCSR_DMAMODE;
744 csr |= (MUSB_RXCSR_DMAENAB |
745 MUSB_RXCSR_AUTOCLEAR);
747 musb_writew(epio, MUSB_RXCSR, csr);
749 if (transfer_size <= musb_ep->packet_sz) {
750 musb_ep->dma->desired_mode = 0;
752 musb_ep->dma->desired_mode = 1;
753 /* Mode must be set after DMAENAB */
754 csr |= MUSB_RXCSR_DMAMODE;
755 musb_writew(epio, MUSB_RXCSR, csr);
758 if (c->channel_program(channel,
760 channel->desired_mode,
768 len = request->length - request->actual;
769 dev_dbg(musb->controller, "%s OUT/RX pio fifo %d/%d, maxpacket %d\n",
770 musb_ep->end_point.name,
774 fifo_count = min_t(unsigned, len, fifo_count);
776 if (tusb_dma_omap(musb)) {
777 struct dma_controller *c = musb->dma_controller;
778 struct dma_channel *channel = musb_ep->dma;
779 u32 dma_addr = request->dma + request->actual;
782 ret = c->channel_program(channel,
784 channel->desired_mode,
792 * Unmap the dma buffer back to cpu if dma channel
793 * programming fails. This buffer is mapped if the
794 * channel allocation is successful
796 unmap_dma_buffer(req, musb);
799 * Clear DMAENAB and AUTOCLEAR for the
802 csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR);
803 musb_writew(epio, MUSB_RXCSR, csr);
806 musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *)
807 (request->buf + request->actual));
808 request->actual += fifo_count;
810 /* REVISIT if we left anything in the fifo, flush
811 * it and report -EOVERFLOW
815 csr |= MUSB_RXCSR_P_WZC_BITS;
816 csr &= ~MUSB_RXCSR_RXPKTRDY;
817 musb_writew(epio, MUSB_RXCSR, csr);
821 /* reach the end or short packet detected */
822 if (request->actual == request->length ||
823 fifo_count < musb_ep->packet_sz)
824 musb_g_giveback(musb_ep, request, 0);
828 * Data ready for a request; called from IRQ
830 void musb_g_rx(struct musb *musb, u8 epnum)
833 struct musb_request *req;
834 struct usb_request *request;
835 void __iomem *mbase = musb->mregs;
836 struct musb_ep *musb_ep;
837 void __iomem *epio = musb->endpoints[epnum].regs;
838 struct dma_channel *dma;
839 struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
841 if (hw_ep->is_shared_fifo)
842 musb_ep = &hw_ep->ep_in;
844 musb_ep = &hw_ep->ep_out;
846 musb_ep_select(mbase, epnum);
848 req = next_request(musb_ep);
852 request = &req->request;
854 csr = musb_readw(epio, MUSB_RXCSR);
855 dma = is_dma_capable() ? musb_ep->dma : NULL;
857 dev_dbg(musb->controller, "<== %s, rxcsr %04x%s %p\n", musb_ep->end_point.name,
858 csr, dma ? " (dma)" : "", request);
860 if (csr & MUSB_RXCSR_P_SENTSTALL) {
861 csr |= MUSB_RXCSR_P_WZC_BITS;
862 csr &= ~MUSB_RXCSR_P_SENTSTALL;
863 musb_writew(epio, MUSB_RXCSR, csr);
867 if (csr & MUSB_RXCSR_P_OVERRUN) {
868 /* csr |= MUSB_RXCSR_P_WZC_BITS; */
869 csr &= ~MUSB_RXCSR_P_OVERRUN;
870 musb_writew(epio, MUSB_RXCSR, csr);
872 dev_dbg(musb->controller, "%s iso overrun on %p\n", musb_ep->name, request);
873 if (request->status == -EINPROGRESS)
874 request->status = -EOVERFLOW;
876 if (csr & MUSB_RXCSR_INCOMPRX) {
877 /* REVISIT not necessarily an error */
878 dev_dbg(musb->controller, "%s, incomprx\n", musb_ep->end_point.name);
881 if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) {
882 /* "should not happen"; likely RXPKTRDY pending for DMA */
883 dev_dbg(musb->controller, "%s busy, csr %04x\n",
884 musb_ep->end_point.name, csr);
888 if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
889 csr &= ~(MUSB_RXCSR_AUTOCLEAR
891 | MUSB_RXCSR_DMAMODE);
892 musb_writew(epio, MUSB_RXCSR,
893 MUSB_RXCSR_P_WZC_BITS | csr);
895 request->actual += musb_ep->dma->actual_len;
897 dev_dbg(musb->controller, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n",
899 musb_readw(epio, MUSB_RXCSR),
900 musb_ep->dma->actual_len, request);
902 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
903 defined(CONFIG_USB_UX500_DMA)
904 /* Autoclear doesn't clear RxPktRdy for short packets */
905 if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered)
907 & (musb_ep->packet_sz - 1))) {
909 csr &= ~MUSB_RXCSR_RXPKTRDY;
910 musb_writew(epio, MUSB_RXCSR, csr);
913 /* incomplete, and not short? wait for next IN packet */
914 if ((request->actual < request->length)
915 && (musb_ep->dma->actual_len
916 == musb_ep->packet_sz)) {
917 /* In double buffer case, continue to unload fifo if
918 * there is Rx packet in FIFO.
920 csr = musb_readw(epio, MUSB_RXCSR);
921 if ((csr & MUSB_RXCSR_RXPKTRDY) &&
922 hw_ep->rx_double_buffered)
927 musb_g_giveback(musb_ep, request, 0);
929 * In the giveback function the MUSB lock is
930 * released and acquired after sometime. During
931 * this time period the INDEX register could get
932 * changed by the gadget_queue function especially
933 * on SMP systems. Reselect the INDEX to be sure
934 * we are reading/modifying the right registers
936 musb_ep_select(mbase, epnum);
938 req = next_request(musb_ep);
942 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \
943 defined(CONFIG_USB_UX500_DMA)
946 /* Analyze request */
950 /* ------------------------------------------------------------ */
952 static int musb_gadget_enable(struct usb_ep *ep,
953 const struct usb_endpoint_descriptor *desc)
956 struct musb_ep *musb_ep;
957 struct musb_hw_ep *hw_ep;
964 int status = -EINVAL;
969 musb_ep = to_musb_ep(ep);
970 hw_ep = musb_ep->hw_ep;
972 musb = musb_ep->musb;
974 epnum = musb_ep->current_epnum;
976 spin_lock_irqsave(&musb->lock, flags);
982 musb_ep->type = usb_endpoint_type(desc);
984 /* check direction and (later) maxpacket size against endpoint */
985 if (usb_endpoint_num(desc) != epnum)
988 /* REVISIT this rules out high bandwidth periodic transfers */
989 tmp = usb_endpoint_maxp(desc);
993 if (usb_endpoint_dir_in(desc))
994 ok = musb->hb_iso_tx;
996 ok = musb->hb_iso_rx;
999 dev_dbg(musb->controller, "no support for high bandwidth ISO\n");
1002 musb_ep->hb_mult = (tmp >> 11) & 3;
1004 musb_ep->hb_mult = 0;
1007 musb_ep->packet_sz = tmp & 0x7ff;
1008 tmp = musb_ep->packet_sz * (musb_ep->hb_mult + 1);
1010 /* enable the interrupts for the endpoint, set the endpoint
1011 * packet size (or fail), set the mode, clear the fifo
1013 musb_ep_select(mbase, epnum);
1014 if (usb_endpoint_dir_in(desc)) {
1016 if (hw_ep->is_shared_fifo)
1018 if (!musb_ep->is_in)
1021 if (tmp > hw_ep->max_packet_sz_tx) {
1022 dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
1026 musb->intrtxe |= (1 << epnum);
1027 musb_writew(mbase, MUSB_INTRTXE, musb->intrtxe);
1029 /* REVISIT if can_bulk_split(), use by updating "tmp";
1030 * likewise high bandwidth periodic tx
1032 /* Set TXMAXP with the FIFO size of the endpoint
1033 * to disable double buffering mode.
1035 if (musb->double_buffer_not_ok) {
1036 musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx);
1038 if (can_bulk_split(musb, musb_ep->type))
1039 musb_ep->hb_mult = (hw_ep->max_packet_sz_tx /
1040 musb_ep->packet_sz) - 1;
1041 musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz
1042 | (musb_ep->hb_mult << 11));
1045 csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG;
1046 if (musb_readw(regs, MUSB_TXCSR)
1047 & MUSB_TXCSR_FIFONOTEMPTY)
1048 csr |= MUSB_TXCSR_FLUSHFIFO;
1049 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
1050 csr |= MUSB_TXCSR_P_ISO;
1052 /* set twice in case of double buffering */
1053 musb_writew(regs, MUSB_TXCSR, csr);
1054 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1055 musb_writew(regs, MUSB_TXCSR, csr);
1059 if (hw_ep->is_shared_fifo)
1064 if (tmp > hw_ep->max_packet_sz_rx) {
1065 dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n");
1069 musb->intrrxe |= (1 << epnum);
1070 musb_writew(mbase, MUSB_INTRRXE, musb->intrrxe);
1072 /* REVISIT if can_bulk_combine() use by updating "tmp"
1073 * likewise high bandwidth periodic rx
1075 /* Set RXMAXP with the FIFO size of the endpoint
1076 * to disable double buffering mode.
1078 if (musb->double_buffer_not_ok)
1079 musb_writew(regs, MUSB_RXMAXP, hw_ep->max_packet_sz_tx);
1081 musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz
1082 | (musb_ep->hb_mult << 11));
1084 /* force shared fifo to OUT-only mode */
1085 if (hw_ep->is_shared_fifo) {
1086 csr = musb_readw(regs, MUSB_TXCSR);
1087 csr &= ~(MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY);
1088 musb_writew(regs, MUSB_TXCSR, csr);
1091 csr = MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_CLRDATATOG;
1092 if (musb_ep->type == USB_ENDPOINT_XFER_ISOC)
1093 csr |= MUSB_RXCSR_P_ISO;
1094 else if (musb_ep->type == USB_ENDPOINT_XFER_INT)
1095 csr |= MUSB_RXCSR_DISNYET;
1097 /* set twice in case of double buffering */
1098 musb_writew(regs, MUSB_RXCSR, csr);
1099 musb_writew(regs, MUSB_RXCSR, csr);
1102 /* NOTE: all the I/O code _should_ work fine without DMA, in case
1103 * for some reason you run out of channels here.
1105 if (is_dma_capable() && musb->dma_controller) {
1106 struct dma_controller *c = musb->dma_controller;
1108 musb_ep->dma = c->channel_alloc(c, hw_ep,
1109 (desc->bEndpointAddress & USB_DIR_IN));
1111 musb_ep->dma = NULL;
1113 musb_ep->desc = desc;
1115 musb_ep->wedged = 0;
1118 pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n",
1119 musb_driver_name, musb_ep->end_point.name,
1120 ({ char *s; switch (musb_ep->type) {
1121 case USB_ENDPOINT_XFER_BULK: s = "bulk"; break;
1122 case USB_ENDPOINT_XFER_INT: s = "int"; break;
1123 default: s = "iso"; break;
1125 musb_ep->is_in ? "IN" : "OUT",
1126 musb_ep->dma ? "dma, " : "",
1127 musb_ep->packet_sz);
1129 schedule_work(&musb->irq_work);
1132 spin_unlock_irqrestore(&musb->lock, flags);
1137 * Disable an endpoint flushing all requests queued.
1139 static int musb_gadget_disable(struct usb_ep *ep)
1141 unsigned long flags;
1144 struct musb_ep *musb_ep;
1148 musb_ep = to_musb_ep(ep);
1149 musb = musb_ep->musb;
1150 epnum = musb_ep->current_epnum;
1151 epio = musb->endpoints[epnum].regs;
1153 spin_lock_irqsave(&musb->lock, flags);
1154 musb_ep_select(musb->mregs, epnum);
1156 /* zero the endpoint sizes */
1157 if (musb_ep->is_in) {
1158 musb->intrtxe &= ~(1 << epnum);
1159 musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe);
1160 musb_writew(epio, MUSB_TXMAXP, 0);
1162 musb->intrrxe &= ~(1 << epnum);
1163 musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe);
1164 musb_writew(epio, MUSB_RXMAXP, 0);
1167 musb_ep->desc = NULL;
1168 musb_ep->end_point.desc = NULL;
1170 /* abort all pending DMA and requests */
1171 nuke(musb_ep, -ESHUTDOWN);
1173 schedule_work(&musb->irq_work);
1175 spin_unlock_irqrestore(&(musb->lock), flags);
1177 dev_dbg(musb->controller, "%s\n", musb_ep->end_point.name);
1183 * Allocate a request for an endpoint.
1184 * Reused by ep0 code.
1186 struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
1188 struct musb_ep *musb_ep = to_musb_ep(ep);
1189 struct musb *musb = musb_ep->musb;
1190 struct musb_request *request = NULL;
1192 request = kzalloc(sizeof *request, gfp_flags);
1194 dev_dbg(musb->controller, "not enough memory\n");
1198 request->request.dma = DMA_ADDR_INVALID;
1199 request->epnum = musb_ep->current_epnum;
1200 request->ep = musb_ep;
1202 return &request->request;
1207 * Reused by ep0 code.
1209 void musb_free_request(struct usb_ep *ep, struct usb_request *req)
1211 kfree(to_musb_request(req));
1214 static LIST_HEAD(buffers);
1216 struct free_record {
1217 struct list_head list;
1224 * Context: controller locked, IRQs blocked.
1226 void musb_ep_restart(struct musb *musb, struct musb_request *req)
1228 dev_dbg(musb->controller, "<== %s request %p len %u on hw_ep%d\n",
1229 req->tx ? "TX/IN" : "RX/OUT",
1230 &req->request, req->request.length, req->epnum);
1232 musb_ep_select(musb->mregs, req->epnum);
1239 static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req,
1242 struct musb_ep *musb_ep;
1243 struct musb_request *request;
1246 unsigned long lockflags;
1253 musb_ep = to_musb_ep(ep);
1254 musb = musb_ep->musb;
1256 request = to_musb_request(req);
1257 request->musb = musb;
1259 if (request->ep != musb_ep)
1262 dev_dbg(musb->controller, "<== to %s request=%p\n", ep->name, req);
1264 /* request is mine now... */
1265 request->request.actual = 0;
1266 request->request.status = -EINPROGRESS;
1267 request->epnum = musb_ep->current_epnum;
1268 request->tx = musb_ep->is_in;
1270 map_dma_buffer(request, musb, musb_ep);
1272 spin_lock_irqsave(&musb->lock, lockflags);
1274 /* don't queue if the ep is down */
1275 if (!musb_ep->desc) {
1276 dev_dbg(musb->controller, "req %p queued to %s while ep %s\n",
1277 req, ep->name, "disabled");
1278 status = -ESHUTDOWN;
1279 unmap_dma_buffer(request, musb);
1283 /* add request to the list */
1284 list_add_tail(&request->list, &musb_ep->req_list);
1286 /* it this is the head of the queue, start i/o ... */
1287 if (!musb_ep->busy && &request->list == musb_ep->req_list.next)
1288 musb_ep_restart(musb, request);
1291 spin_unlock_irqrestore(&musb->lock, lockflags);
1295 static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request)
1297 struct musb_ep *musb_ep = to_musb_ep(ep);
1298 struct musb_request *req = to_musb_request(request);
1299 struct musb_request *r;
1300 unsigned long flags;
1302 struct musb *musb = musb_ep->musb;
1304 if (!ep || !request || to_musb_request(request)->ep != musb_ep)
1307 spin_lock_irqsave(&musb->lock, flags);
1309 list_for_each_entry(r, &musb_ep->req_list, list) {
1314 dev_dbg(musb->controller, "request %p not queued to %s\n", request, ep->name);
1319 /* if the hardware doesn't have the request, easy ... */
1320 if (musb_ep->req_list.next != &req->list || musb_ep->busy)
1321 musb_g_giveback(musb_ep, request, -ECONNRESET);
1323 /* ... else abort the dma transfer ... */
1324 else if (is_dma_capable() && musb_ep->dma) {
1325 struct dma_controller *c = musb->dma_controller;
1327 musb_ep_select(musb->mregs, musb_ep->current_epnum);
1328 if (c->channel_abort)
1329 status = c->channel_abort(musb_ep->dma);
1333 musb_g_giveback(musb_ep, request, -ECONNRESET);
1335 /* NOTE: by sticking to easily tested hardware/driver states,
1336 * we leave counting of in-flight packets imprecise.
1338 musb_g_giveback(musb_ep, request, -ECONNRESET);
1342 spin_unlock_irqrestore(&musb->lock, flags);
1347 * Set or clear the halt bit of an endpoint. A halted enpoint won't tx/rx any
1348 * data but will queue requests.
1350 * exported to ep0 code
1352 static int musb_gadget_set_halt(struct usb_ep *ep, int value)
1354 struct musb_ep *musb_ep = to_musb_ep(ep);
1355 u8 epnum = musb_ep->current_epnum;
1356 struct musb *musb = musb_ep->musb;
1357 void __iomem *epio = musb->endpoints[epnum].regs;
1358 void __iomem *mbase;
1359 unsigned long flags;
1361 struct musb_request *request;
1366 mbase = musb->mregs;
1368 spin_lock_irqsave(&musb->lock, flags);
1370 if ((USB_ENDPOINT_XFER_ISOC == musb_ep->type)) {
1375 musb_ep_select(mbase, epnum);
1377 request = next_request(musb_ep);
1380 dev_dbg(musb->controller, "request in progress, cannot halt %s\n",
1385 /* Cannot portably stall with non-empty FIFO */
1386 if (musb_ep->is_in) {
1387 csr = musb_readw(epio, MUSB_TXCSR);
1388 if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
1389 dev_dbg(musb->controller, "FIFO busy, cannot halt %s\n", ep->name);
1395 musb_ep->wedged = 0;
1397 /* set/clear the stall and toggle bits */
1398 dev_dbg(musb->controller, "%s: %s stall\n", ep->name, value ? "set" : "clear");
1399 if (musb_ep->is_in) {
1400 csr = musb_readw(epio, MUSB_TXCSR);
1401 csr |= MUSB_TXCSR_P_WZC_BITS
1402 | MUSB_TXCSR_CLRDATATOG;
1404 csr |= MUSB_TXCSR_P_SENDSTALL;
1406 csr &= ~(MUSB_TXCSR_P_SENDSTALL
1407 | MUSB_TXCSR_P_SENTSTALL);
1408 csr &= ~MUSB_TXCSR_TXPKTRDY;
1409 musb_writew(epio, MUSB_TXCSR, csr);
1411 csr = musb_readw(epio, MUSB_RXCSR);
1412 csr |= MUSB_RXCSR_P_WZC_BITS
1413 | MUSB_RXCSR_FLUSHFIFO
1414 | MUSB_RXCSR_CLRDATATOG;
1416 csr |= MUSB_RXCSR_P_SENDSTALL;
1418 csr &= ~(MUSB_RXCSR_P_SENDSTALL
1419 | MUSB_RXCSR_P_SENTSTALL);
1420 musb_writew(epio, MUSB_RXCSR, csr);
1423 /* maybe start the first request in the queue */
1424 if (!musb_ep->busy && !value && request) {
1425 dev_dbg(musb->controller, "restarting the request\n");
1426 musb_ep_restart(musb, request);
1430 spin_unlock_irqrestore(&musb->lock, flags);
1435 * Sets the halt feature with the clear requests ignored
1437 static int musb_gadget_set_wedge(struct usb_ep *ep)
1439 struct musb_ep *musb_ep = to_musb_ep(ep);
1444 musb_ep->wedged = 1;
1446 return usb_ep_set_halt(ep);
1449 static int musb_gadget_fifo_status(struct usb_ep *ep)
1451 struct musb_ep *musb_ep = to_musb_ep(ep);
1452 void __iomem *epio = musb_ep->hw_ep->regs;
1453 int retval = -EINVAL;
1455 if (musb_ep->desc && !musb_ep->is_in) {
1456 struct musb *musb = musb_ep->musb;
1457 int epnum = musb_ep->current_epnum;
1458 void __iomem *mbase = musb->mregs;
1459 unsigned long flags;
1461 spin_lock_irqsave(&musb->lock, flags);
1463 musb_ep_select(mbase, epnum);
1464 /* FIXME return zero unless RXPKTRDY is set */
1465 retval = musb_readw(epio, MUSB_RXCOUNT);
1467 spin_unlock_irqrestore(&musb->lock, flags);
1472 static void musb_gadget_fifo_flush(struct usb_ep *ep)
1474 struct musb_ep *musb_ep = to_musb_ep(ep);
1475 struct musb *musb = musb_ep->musb;
1476 u8 epnum = musb_ep->current_epnum;
1477 void __iomem *epio = musb->endpoints[epnum].regs;
1478 void __iomem *mbase;
1479 unsigned long flags;
1482 mbase = musb->mregs;
1484 spin_lock_irqsave(&musb->lock, flags);
1485 musb_ep_select(mbase, (u8) epnum);
1487 /* disable interrupts */
1488 musb_writew(mbase, MUSB_INTRTXE, musb->intrtxe & ~(1 << epnum));
1490 if (musb_ep->is_in) {
1491 csr = musb_readw(epio, MUSB_TXCSR);
1492 if (csr & MUSB_TXCSR_FIFONOTEMPTY) {
1493 csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_P_WZC_BITS;
1495 * Setting both TXPKTRDY and FLUSHFIFO makes controller
1496 * to interrupt current FIFO loading, but not flushing
1497 * the already loaded ones.
1499 csr &= ~MUSB_TXCSR_TXPKTRDY;
1500 musb_writew(epio, MUSB_TXCSR, csr);
1501 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1502 musb_writew(epio, MUSB_TXCSR, csr);
1505 csr = musb_readw(epio, MUSB_RXCSR);
1506 csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_P_WZC_BITS;
1507 musb_writew(epio, MUSB_RXCSR, csr);
1508 musb_writew(epio, MUSB_RXCSR, csr);
1511 /* re-enable interrupt */
1512 musb_writew(mbase, MUSB_INTRTXE, musb->intrtxe);
1513 spin_unlock_irqrestore(&musb->lock, flags);
1516 static const struct usb_ep_ops musb_ep_ops = {
1517 .enable = musb_gadget_enable,
1518 .disable = musb_gadget_disable,
1519 .alloc_request = musb_alloc_request,
1520 .free_request = musb_free_request,
1521 .queue = musb_gadget_queue,
1522 .dequeue = musb_gadget_dequeue,
1523 .set_halt = musb_gadget_set_halt,
1524 .set_wedge = musb_gadget_set_wedge,
1525 .fifo_status = musb_gadget_fifo_status,
1526 .fifo_flush = musb_gadget_fifo_flush
1529 /* ----------------------------------------------------------------------- */
1531 static int musb_gadget_get_frame(struct usb_gadget *gadget)
1533 struct musb *musb = gadget_to_musb(gadget);
1535 return (int)musb_readw(musb->mregs, MUSB_FRAME);
1538 static int musb_gadget_wakeup(struct usb_gadget *gadget)
1540 struct musb *musb = gadget_to_musb(gadget);
1541 void __iomem *mregs = musb->mregs;
1542 unsigned long flags;
1543 int status = -EINVAL;
1547 spin_lock_irqsave(&musb->lock, flags);
1549 switch (musb->xceiv->otg->state) {
1550 case OTG_STATE_B_PERIPHERAL:
1551 /* NOTE: OTG state machine doesn't include B_SUSPENDED;
1552 * that's part of the standard usb 1.1 state machine, and
1553 * doesn't affect OTG transitions.
1555 if (musb->may_wakeup && musb->is_suspended)
1558 case OTG_STATE_B_IDLE:
1559 /* Start SRP ... OTG not required. */
1560 devctl = musb_readb(mregs, MUSB_DEVCTL);
1561 dev_dbg(musb->controller, "Sending SRP: devctl: %02x\n", devctl);
1562 devctl |= MUSB_DEVCTL_SESSION;
1563 musb_writeb(mregs, MUSB_DEVCTL, devctl);
1564 devctl = musb_readb(mregs, MUSB_DEVCTL);
1566 while (!(devctl & MUSB_DEVCTL_SESSION)) {
1567 devctl = musb_readb(mregs, MUSB_DEVCTL);
1572 while (devctl & MUSB_DEVCTL_SESSION) {
1573 devctl = musb_readb(mregs, MUSB_DEVCTL);
1578 spin_unlock_irqrestore(&musb->lock, flags);
1579 otg_start_srp(musb->xceiv->otg);
1580 spin_lock_irqsave(&musb->lock, flags);
1582 /* Block idling for at least 1s */
1583 musb_platform_try_idle(musb,
1584 jiffies + msecs_to_jiffies(1 * HZ));
1589 dev_dbg(musb->controller, "Unhandled wake: %s\n",
1590 usb_otg_state_string(musb->xceiv->otg->state));
1596 power = musb_readb(mregs, MUSB_POWER);
1597 power |= MUSB_POWER_RESUME;
1598 musb_writeb(mregs, MUSB_POWER, power);
1599 dev_dbg(musb->controller, "issue wakeup\n");
1601 /* FIXME do this next chunk in a timer callback, no udelay */
1604 power = musb_readb(mregs, MUSB_POWER);
1605 power &= ~MUSB_POWER_RESUME;
1606 musb_writeb(mregs, MUSB_POWER, power);
1608 spin_unlock_irqrestore(&musb->lock, flags);
1613 musb_gadget_set_self_powered(struct usb_gadget *gadget, int is_selfpowered)
1615 gadget->is_selfpowered = !!is_selfpowered;
1619 static void musb_pullup(struct musb *musb, int is_on)
1623 power = musb_readb(musb->mregs, MUSB_POWER);
1625 power |= MUSB_POWER_SOFTCONN;
1627 power &= ~MUSB_POWER_SOFTCONN;
1629 /* FIXME if on, HdrcStart; if off, HdrcStop */
1631 dev_dbg(musb->controller, "gadget D+ pullup %s\n",
1632 is_on ? "on" : "off");
1633 musb_writeb(musb->mregs, MUSB_POWER, power);
1637 static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active)
1639 dev_dbg(musb->controller, "<= %s =>\n", __func__);
1642 * FIXME iff driver's softconnect flag is set (as it is during probe,
1643 * though that can clear it), just musb_pullup().
1650 static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
1652 struct musb *musb = gadget_to_musb(gadget);
1654 if (!musb->xceiv->set_power)
1656 return usb_phy_set_power(musb->xceiv, mA);
1659 static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on)
1661 struct musb *musb = gadget_to_musb(gadget);
1662 unsigned long flags;
1666 pm_runtime_get_sync(musb->controller);
1668 /* NOTE: this assumes we are sensing vbus; we'd rather
1669 * not pullup unless the B-session is active.
1671 spin_lock_irqsave(&musb->lock, flags);
1672 if (is_on != musb->softconnect) {
1673 musb->softconnect = is_on;
1674 musb_pullup(musb, is_on);
1676 spin_unlock_irqrestore(&musb->lock, flags);
1678 pm_runtime_put(musb->controller);
1683 #ifdef CONFIG_BLACKFIN
1684 static struct usb_ep *musb_match_ep(struct usb_gadget *g,
1685 struct usb_endpoint_descriptor *desc,
1686 struct usb_ss_ep_comp_descriptor *ep_comp)
1688 struct usb_ep *ep = NULL;
1690 switch (usb_endpoint_type(desc)) {
1691 case USB_ENDPOINT_XFER_ISOC:
1692 case USB_ENDPOINT_XFER_BULK:
1693 if (usb_endpoint_dir_in(desc))
1694 ep = gadget_find_ep_by_name(g, "ep5in");
1696 ep = gadget_find_ep_by_name(g, "ep6out");
1698 case USB_ENDPOINT_XFER_INT:
1699 if (usb_endpoint_dir_in(desc))
1700 ep = gadget_find_ep_by_name(g, "ep1in");
1702 ep = gadget_find_ep_by_name(g, "ep2out");
1708 if (ep && usb_gadget_ep_match_desc(g, ep, desc, ep_comp))
1714 #define musb_match_ep NULL
1717 static int musb_gadget_start(struct usb_gadget *g,
1718 struct usb_gadget_driver *driver);
1719 static int musb_gadget_stop(struct usb_gadget *g);
1721 static const struct usb_gadget_ops musb_gadget_operations = {
1722 .get_frame = musb_gadget_get_frame,
1723 .wakeup = musb_gadget_wakeup,
1724 .set_selfpowered = musb_gadget_set_self_powered,
1725 /* .vbus_session = musb_gadget_vbus_session, */
1726 .vbus_draw = musb_gadget_vbus_draw,
1727 .pullup = musb_gadget_pullup,
1728 .udc_start = musb_gadget_start,
1729 .udc_stop = musb_gadget_stop,
1730 .match_ep = musb_match_ep,
1733 /* ----------------------------------------------------------------------- */
1737 /* Only this registration code "knows" the rule (from USB standards)
1738 * about there being only one external upstream port. It assumes
1739 * all peripheral ports are external...
1743 init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in)
1745 struct musb_hw_ep *hw_ep = musb->endpoints + epnum;
1747 memset(ep, 0, sizeof *ep);
1749 ep->current_epnum = epnum;
1754 INIT_LIST_HEAD(&ep->req_list);
1756 sprintf(ep->name, "ep%d%s", epnum,
1757 (!epnum || hw_ep->is_shared_fifo) ? "" : (
1758 is_in ? "in" : "out"));
1759 ep->end_point.name = ep->name;
1760 INIT_LIST_HEAD(&ep->end_point.ep_list);
1762 usb_ep_set_maxpacket_limit(&ep->end_point, 64);
1763 ep->end_point.caps.type_control = true;
1764 ep->end_point.ops = &musb_g_ep0_ops;
1765 musb->g.ep0 = &ep->end_point;
1768 usb_ep_set_maxpacket_limit(&ep->end_point, hw_ep->max_packet_sz_tx);
1770 usb_ep_set_maxpacket_limit(&ep->end_point, hw_ep->max_packet_sz_rx);
1771 ep->end_point.caps.type_iso = true;
1772 ep->end_point.caps.type_bulk = true;
1773 ep->end_point.caps.type_int = true;
1774 ep->end_point.ops = &musb_ep_ops;
1775 list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list);
1778 if (!epnum || hw_ep->is_shared_fifo) {
1779 ep->end_point.caps.dir_in = true;
1780 ep->end_point.caps.dir_out = true;
1782 ep->end_point.caps.dir_in = true;
1784 ep->end_point.caps.dir_out = true;
1788 * Initialize the endpoints exposed to peripheral drivers, with backlinks
1789 * to the rest of the driver state.
1791 static inline void musb_g_init_endpoints(struct musb *musb)
1794 struct musb_hw_ep *hw_ep;
1797 /* initialize endpoint list just once */
1798 INIT_LIST_HEAD(&(musb->g.ep_list));
1800 for (epnum = 0, hw_ep = musb->endpoints;
1801 epnum < musb->nr_endpoints;
1803 if (hw_ep->is_shared_fifo /* || !epnum */) {
1804 init_peripheral_ep(musb, &hw_ep->ep_in, epnum, 0);
1807 if (hw_ep->max_packet_sz_tx) {
1808 init_peripheral_ep(musb, &hw_ep->ep_in,
1812 if (hw_ep->max_packet_sz_rx) {
1813 init_peripheral_ep(musb, &hw_ep->ep_out,
1821 /* called once during driver setup to initialize and link into
1822 * the driver model; memory is zeroed.
1824 int musb_gadget_setup(struct musb *musb)
1828 /* REVISIT minor race: if (erroneously) setting up two
1829 * musb peripherals at the same time, only the bus lock
1833 musb->g.ops = &musb_gadget_operations;
1834 musb->g.max_speed = USB_SPEED_HIGH;
1835 musb->g.speed = USB_SPEED_UNKNOWN;
1837 MUSB_DEV_MODE(musb);
1838 musb->xceiv->otg->default_a = 0;
1839 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
1841 /* this "gadget" abstracts/virtualizes the controller */
1842 musb->g.name = musb_driver_name;
1843 #if IS_ENABLED(CONFIG_USB_MUSB_DUAL_ROLE)
1845 #elif IS_ENABLED(CONFIG_USB_MUSB_GADGET)
1849 musb_g_init_endpoints(musb);
1851 musb->is_active = 0;
1852 musb_platform_try_idle(musb, 0);
1854 status = usb_add_gadget_udc(musb->controller, &musb->g);
1860 musb->g.dev.parent = NULL;
1861 device_unregister(&musb->g.dev);
1865 void musb_gadget_cleanup(struct musb *musb)
1867 if (musb->port_mode == MUSB_PORT_MODE_HOST)
1869 usb_del_gadget_udc(&musb->g);
1873 * Register the gadget driver. Used by gadget drivers when
1874 * registering themselves with the controller.
1876 * -EINVAL something went wrong (not driver)
1877 * -EBUSY another gadget is already using the controller
1878 * -ENOMEM no memory to perform the operation
1880 * @param driver the gadget driver
1881 * @return <0 if error, 0 if everything is fine
1883 static int musb_gadget_start(struct usb_gadget *g,
1884 struct usb_gadget_driver *driver)
1886 struct musb *musb = gadget_to_musb(g);
1887 struct usb_otg *otg = musb->xceiv->otg;
1888 unsigned long flags;
1891 if (driver->max_speed < USB_SPEED_HIGH) {
1896 pm_runtime_get_sync(musb->controller);
1898 musb->softconnect = 0;
1899 musb->gadget_driver = driver;
1901 spin_lock_irqsave(&musb->lock, flags);
1902 musb->is_active = 1;
1904 otg_set_peripheral(otg, &musb->g);
1905 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
1906 spin_unlock_irqrestore(&musb->lock, flags);
1910 /* REVISIT: funcall to other code, which also
1911 * handles power budgeting ... this way also
1912 * ensures HdrcStart is indirectly called.
1914 if (musb->xceiv->last_event == USB_EVENT_ID)
1915 musb_platform_set_vbus(musb, 1);
1917 if (musb->xceiv->last_event == USB_EVENT_NONE)
1918 pm_runtime_put(musb->controller);
1927 * Unregister the gadget driver. Used by gadget drivers when
1928 * unregistering themselves from the controller.
1930 * @param driver the gadget driver to unregister
1932 static int musb_gadget_stop(struct usb_gadget *g)
1934 struct musb *musb = gadget_to_musb(g);
1935 unsigned long flags;
1937 if (musb->xceiv->last_event == USB_EVENT_NONE)
1938 pm_runtime_get_sync(musb->controller);
1941 * REVISIT always use otg_set_peripheral() here too;
1942 * this needs to shut down the OTG engine.
1945 spin_lock_irqsave(&musb->lock, flags);
1947 musb_hnp_stop(musb);
1949 (void) musb_gadget_vbus_draw(&musb->g, 0);
1951 musb->xceiv->otg->state = OTG_STATE_UNDEFINED;
1953 otg_set_peripheral(musb->xceiv->otg, NULL);
1955 musb->is_active = 0;
1956 musb->gadget_driver = NULL;
1957 musb_platform_try_idle(musb, 0);
1958 spin_unlock_irqrestore(&musb->lock, flags);
1961 * FIXME we need to be able to register another
1962 * gadget driver here and have everything work;
1963 * that currently misbehaves.
1966 pm_runtime_put(musb->controller);
1971 /* ----------------------------------------------------------------------- */
1973 /* lifecycle operations called through plat_uds.c */
1975 void musb_g_resume(struct musb *musb)
1977 musb->is_suspended = 0;
1978 switch (musb->xceiv->otg->state) {
1979 case OTG_STATE_B_IDLE:
1981 case OTG_STATE_B_WAIT_ACON:
1982 case OTG_STATE_B_PERIPHERAL:
1983 musb->is_active = 1;
1984 if (musb->gadget_driver && musb->gadget_driver->resume) {
1985 spin_unlock(&musb->lock);
1986 musb->gadget_driver->resume(&musb->g);
1987 spin_lock(&musb->lock);
1991 WARNING("unhandled RESUME transition (%s)\n",
1992 usb_otg_state_string(musb->xceiv->otg->state));
1996 /* called when SOF packets stop for 3+ msec */
1997 void musb_g_suspend(struct musb *musb)
2001 devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
2002 dev_dbg(musb->controller, "devctl %02x\n", devctl);
2004 switch (musb->xceiv->otg->state) {
2005 case OTG_STATE_B_IDLE:
2006 if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
2007 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
2009 case OTG_STATE_B_PERIPHERAL:
2010 musb->is_suspended = 1;
2011 if (musb->gadget_driver && musb->gadget_driver->suspend) {
2012 spin_unlock(&musb->lock);
2013 musb->gadget_driver->suspend(&musb->g);
2014 spin_lock(&musb->lock);
2018 /* REVISIT if B_HOST, clear DEVCTL.HOSTREQ;
2019 * A_PERIPHERAL may need care too
2021 WARNING("unhandled SUSPEND transition (%s)\n",
2022 usb_otg_state_string(musb->xceiv->otg->state));
2026 /* Called during SRP */
2027 void musb_g_wakeup(struct musb *musb)
2029 musb_gadget_wakeup(&musb->g);
2032 /* called when VBUS drops below session threshold, and in other cases */
2033 void musb_g_disconnect(struct musb *musb)
2035 void __iomem *mregs = musb->mregs;
2036 u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
2038 dev_dbg(musb->controller, "devctl %02x\n", devctl);
2041 musb_writeb(mregs, MUSB_DEVCTL, devctl & MUSB_DEVCTL_SESSION);
2043 /* don't draw vbus until new b-default session */
2044 (void) musb_gadget_vbus_draw(&musb->g, 0);
2046 musb->g.speed = USB_SPEED_UNKNOWN;
2047 if (musb->gadget_driver && musb->gadget_driver->disconnect) {
2048 spin_unlock(&musb->lock);
2049 musb->gadget_driver->disconnect(&musb->g);
2050 spin_lock(&musb->lock);
2053 switch (musb->xceiv->otg->state) {
2055 dev_dbg(musb->controller, "Unhandled disconnect %s, setting a_idle\n",
2056 usb_otg_state_string(musb->xceiv->otg->state));
2057 musb->xceiv->otg->state = OTG_STATE_A_IDLE;
2058 MUSB_HST_MODE(musb);
2060 case OTG_STATE_A_PERIPHERAL:
2061 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
2062 MUSB_HST_MODE(musb);
2064 case OTG_STATE_B_WAIT_ACON:
2065 case OTG_STATE_B_HOST:
2066 case OTG_STATE_B_PERIPHERAL:
2067 case OTG_STATE_B_IDLE:
2068 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
2070 case OTG_STATE_B_SRP_INIT:
2074 musb->is_active = 0;
2077 void musb_g_reset(struct musb *musb)
2078 __releases(musb->lock)
2079 __acquires(musb->lock)
2081 void __iomem *mbase = musb->mregs;
2082 u8 devctl = musb_readb(mbase, MUSB_DEVCTL);
2085 dev_dbg(musb->controller, "<== %s driver '%s'\n",
2086 (devctl & MUSB_DEVCTL_BDEVICE)
2087 ? "B-Device" : "A-Device",
2089 ? musb->gadget_driver->driver.name
2093 /* report reset, if we didn't already (flushing EP state) */
2094 if (musb->gadget_driver && musb->g.speed != USB_SPEED_UNKNOWN) {
2095 spin_unlock(&musb->lock);
2096 usb_gadget_udc_reset(&musb->g, musb->gadget_driver);
2097 spin_lock(&musb->lock);
2101 else if (devctl & MUSB_DEVCTL_HR)
2102 musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
2105 /* what speed did we negotiate? */
2106 power = musb_readb(mbase, MUSB_POWER);
2107 musb->g.speed = (power & MUSB_POWER_HSMODE)
2108 ? USB_SPEED_HIGH : USB_SPEED_FULL;
2110 /* start in USB_STATE_DEFAULT */
2111 musb->is_active = 1;
2112 musb->is_suspended = 0;
2113 MUSB_DEV_MODE(musb);
2115 musb->ep0_state = MUSB_EP0_STAGE_SETUP;
2117 musb->may_wakeup = 0;
2118 musb->g.b_hnp_enable = 0;
2119 musb->g.a_alt_hnp_support = 0;
2120 musb->g.a_hnp_support = 0;
2121 musb->g.quirk_zlp_not_supp = 1;
2123 /* Normal reset, as B-Device;
2124 * or else after HNP, as A-Device
2126 if (!musb->g.is_otg) {
2127 /* USB device controllers that are not OTG compatible
2128 * may not have DEVCTL register in silicon.
2129 * In that case, do not rely on devctl for setting
2132 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
2133 musb->g.is_a_peripheral = 0;
2134 } else if (devctl & MUSB_DEVCTL_BDEVICE) {
2135 musb->xceiv->otg->state = OTG_STATE_B_PERIPHERAL;
2136 musb->g.is_a_peripheral = 0;
2138 musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
2139 musb->g.is_a_peripheral = 1;
2142 /* start with default limits on VBUS power draw */
2143 (void) musb_gadget_vbus_draw(&musb->g, 8);