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
7 * Copyright (C) 2009 MontaVista Software, Inc. <source@mvista.com>
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/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:
53 * - EP0 seems solid. It passes both USBCV and usbtest control cases.
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
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
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?
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
81 * - ISO not tested ... might work, but only weakly isochronous
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.)
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
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
)
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
)
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.
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
);
122 if (request
->request
.dma
== DMA_ADDR_INVALID
) {
123 request
->request
.dma
= dma_map_single(
125 request
->request
.buf
,
126 request
->request
.length
,
130 request
->map_state
= MUSB_MAPPED
;
132 dma_sync_single_for_device(musb
->controller
,
133 request
->request
.dma
,
134 request
->request
.length
,
138 request
->map_state
= PRE_MAPPED
;
142 /* Unmap the buffer from dma and maps it back to cpu */
143 static inline void unmap_dma_buffer(struct musb_request
*request
,
146 if (!is_buffer_mapped(request
))
149 if (request
->request
.dma
== DMA_ADDR_INVALID
) {
150 DBG(20, "not unmapping a never mapped buffer\n");
153 if (request
->map_state
== MUSB_MAPPED
) {
154 dma_unmap_single(musb
->controller
,
155 request
->request
.dma
,
156 request
->request
.length
,
160 request
->request
.dma
= DMA_ADDR_INVALID
;
161 } else { /* PRE_MAPPED */
162 dma_sync_single_for_cpu(musb
->controller
,
163 request
->request
.dma
,
164 request
->request
.length
,
169 request
->map_state
= UN_MAPPED
;
173 * Immediately complete a request.
175 * @param request the request to complete
176 * @param status the status to complete the request with
177 * Context: controller locked, IRQs blocked.
179 void musb_g_giveback(
181 struct usb_request
*request
,
183 __releases(ep
->musb
->lock
)
184 __acquires(ep
->musb
->lock
)
186 struct musb_request
*req
;
190 req
= to_musb_request(request
);
192 list_del(&request
->list
);
193 if (req
->request
.status
== -EINPROGRESS
)
194 req
->request
.status
= status
;
198 spin_unlock(&musb
->lock
);
199 unmap_dma_buffer(req
, musb
);
200 if (request
->status
== 0)
201 DBG(5, "%s done request %p, %d/%d\n",
202 ep
->end_point
.name
, request
,
203 req
->request
.actual
, req
->request
.length
);
205 DBG(2, "%s request %p, %d/%d fault %d\n",
206 ep
->end_point
.name
, request
,
207 req
->request
.actual
, req
->request
.length
,
209 req
->request
.complete(&req
->ep
->end_point
, &req
->request
);
210 spin_lock(&musb
->lock
);
214 /* ----------------------------------------------------------------------- */
217 * Abort requests queued to an endpoint using the status. Synchronous.
218 * caller locked controller and blocked irqs, and selected this ep.
220 static void nuke(struct musb_ep
*ep
, const int status
)
222 struct musb_request
*req
= NULL
;
223 void __iomem
*epio
= ep
->musb
->endpoints
[ep
->current_epnum
].regs
;
227 if (is_dma_capable() && ep
->dma
) {
228 struct dma_controller
*c
= ep
->musb
->dma_controller
;
233 * The programming guide says that we must not clear
234 * the DMAMODE bit before DMAENAB, so we only
235 * clear it in the second write...
237 musb_writew(epio
, MUSB_TXCSR
,
238 MUSB_TXCSR_DMAMODE
| MUSB_TXCSR_FLUSHFIFO
);
239 musb_writew(epio
, MUSB_TXCSR
,
240 0 | MUSB_TXCSR_FLUSHFIFO
);
242 musb_writew(epio
, MUSB_RXCSR
,
243 0 | MUSB_RXCSR_FLUSHFIFO
);
244 musb_writew(epio
, MUSB_RXCSR
,
245 0 | MUSB_RXCSR_FLUSHFIFO
);
248 value
= c
->channel_abort(ep
->dma
);
249 DBG(value
? 1 : 6, "%s: abort DMA --> %d\n", ep
->name
, value
);
250 c
->channel_release(ep
->dma
);
254 while (!list_empty(&(ep
->req_list
))) {
255 req
= container_of(ep
->req_list
.next
, struct musb_request
,
257 musb_g_giveback(ep
, &req
->request
, status
);
261 /* ----------------------------------------------------------------------- */
263 /* Data transfers - pure PIO, pure DMA, or mixed mode */
266 * This assumes the separate CPPI engine is responding to DMA requests
267 * from the usb core ... sequenced a bit differently from mentor dma.
270 static inline int max_ep_writesize(struct musb
*musb
, struct musb_ep
*ep
)
272 if (can_bulk_split(musb
, ep
->type
))
273 return ep
->hw_ep
->max_packet_sz_tx
;
275 return ep
->packet_sz
;
279 #ifdef CONFIG_USB_INVENTRA_DMA
281 /* Peripheral tx (IN) using Mentor DMA works as follows:
282 Only mode 0 is used for transfers <= wPktSize,
283 mode 1 is used for larger transfers,
285 One of the following happens:
286 - Host sends IN token which causes an endpoint interrupt
288 -> if DMA is currently busy, exit.
289 -> if queue is non-empty, txstate().
291 - Request is queued by the gadget driver.
292 -> if queue was previously empty, txstate()
297 | (data is transferred to the FIFO, then sent out when
298 | IN token(s) are recd from Host.
299 | -> DMA interrupt on completion
301 | -> stop DMA, ~DMAENAB,
302 | -> set TxPktRdy for last short pkt or zlp
303 | -> Complete Request
304 | -> Continue next request (call txstate)
305 |___________________________________|
307 * Non-Mentor DMA engines can of course work differently, such as by
308 * upleveling from irq-per-packet to irq-per-buffer.
314 * An endpoint is transmitting data. This can be called either from
315 * the IRQ routine or from ep.queue() to kickstart a request on an
318 * Context: controller locked, IRQs blocked, endpoint selected
320 static void txstate(struct musb
*musb
, struct musb_request
*req
)
322 u8 epnum
= req
->epnum
;
323 struct musb_ep
*musb_ep
;
324 void __iomem
*epio
= musb
->endpoints
[epnum
].regs
;
325 struct usb_request
*request
;
326 u16 fifo_count
= 0, csr
;
331 /* we shouldn't get here while DMA is active ... but we do ... */
332 if (dma_channel_status(musb_ep
->dma
) == MUSB_DMA_STATUS_BUSY
) {
333 DBG(4, "dma pending...\n");
337 /* read TXCSR before */
338 csr
= musb_readw(epio
, MUSB_TXCSR
);
340 request
= &req
->request
;
341 fifo_count
= min(max_ep_writesize(musb
, musb_ep
),
342 (int)(request
->length
- request
->actual
));
344 if (csr
& MUSB_TXCSR_TXPKTRDY
) {
345 DBG(5, "%s old packet still ready , txcsr %03x\n",
346 musb_ep
->end_point
.name
, csr
);
350 if (csr
& MUSB_TXCSR_P_SENDSTALL
) {
351 DBG(5, "%s stalling, txcsr %03x\n",
352 musb_ep
->end_point
.name
, csr
);
356 DBG(4, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x\n",
357 epnum
, musb_ep
->packet_sz
, fifo_count
,
360 #ifndef CONFIG_MUSB_PIO_ONLY
361 if (is_buffer_mapped(req
)) {
362 struct dma_controller
*c
= musb
->dma_controller
;
365 /* setup DMA, then program endpoint CSR */
366 request_size
= min_t(size_t, request
->length
- request
->actual
,
367 musb_ep
->dma
->max_len
);
369 use_dma
= (request
->dma
!= DMA_ADDR_INVALID
);
371 /* MUSB_TXCSR_P_ISO is still set correctly */
373 #ifdef CONFIG_USB_INVENTRA_DMA
375 if (request_size
< musb_ep
->packet_sz
)
376 musb_ep
->dma
->desired_mode
= 0;
378 musb_ep
->dma
->desired_mode
= 1;
380 use_dma
= use_dma
&& c
->channel_program(
381 musb_ep
->dma
, musb_ep
->packet_sz
,
382 musb_ep
->dma
->desired_mode
,
383 request
->dma
+ request
->actual
, request_size
);
385 if (musb_ep
->dma
->desired_mode
== 0) {
387 * We must not clear the DMAMODE bit
388 * before the DMAENAB bit -- and the
389 * latter doesn't always get cleared
390 * before we get here...
392 csr
&= ~(MUSB_TXCSR_AUTOSET
393 | MUSB_TXCSR_DMAENAB
);
394 musb_writew(epio
, MUSB_TXCSR
, csr
395 | MUSB_TXCSR_P_WZC_BITS
);
396 csr
&= ~MUSB_TXCSR_DMAMODE
;
397 csr
|= (MUSB_TXCSR_DMAENAB
|
399 /* against programming guide */
401 csr
|= (MUSB_TXCSR_DMAENAB
404 if (!musb_ep
->hb_mult
)
405 csr
|= MUSB_TXCSR_AUTOSET
;
407 csr
&= ~MUSB_TXCSR_P_UNDERRUN
;
409 musb_writew(epio
, MUSB_TXCSR
, csr
);
413 #elif defined(CONFIG_USB_TI_CPPI_DMA)
414 /* program endpoint CSR first, then setup DMA */
415 csr
&= ~(MUSB_TXCSR_P_UNDERRUN
| MUSB_TXCSR_TXPKTRDY
);
416 csr
|= MUSB_TXCSR_DMAENAB
| MUSB_TXCSR_DMAMODE
|
418 musb_writew(epio
, MUSB_TXCSR
,
419 (MUSB_TXCSR_P_WZC_BITS
& ~MUSB_TXCSR_P_UNDERRUN
)
422 /* ensure writebuffer is empty */
423 csr
= musb_readw(epio
, MUSB_TXCSR
);
425 /* NOTE host side sets DMAENAB later than this; both are
426 * OK since the transfer dma glue (between CPPI and Mentor
427 * fifos) just tells CPPI it could start. Data only moves
428 * to the USB TX fifo when both fifos are ready.
431 /* "mode" is irrelevant here; handle terminating ZLPs like
432 * PIO does, since the hardware RNDIS mode seems unreliable
433 * except for the last-packet-is-already-short case.
435 use_dma
= use_dma
&& c
->channel_program(
436 musb_ep
->dma
, musb_ep
->packet_sz
,
438 request
->dma
+ request
->actual
,
441 c
->channel_release(musb_ep
->dma
);
443 csr
&= ~MUSB_TXCSR_DMAENAB
;
444 musb_writew(epio
, MUSB_TXCSR
, csr
);
445 /* invariant: prequest->buf is non-null */
447 #elif defined(CONFIG_USB_TUSB_OMAP_DMA)
448 use_dma
= use_dma
&& c
->channel_program(
449 musb_ep
->dma
, musb_ep
->packet_sz
,
451 request
->dma
+ request
->actual
,
459 * Unmap the dma buffer back to cpu if dma channel
462 unmap_dma_buffer(req
, musb
);
464 musb_write_fifo(musb_ep
->hw_ep
, fifo_count
,
465 (u8
*) (request
->buf
+ request
->actual
));
466 request
->actual
+= fifo_count
;
467 csr
|= MUSB_TXCSR_TXPKTRDY
;
468 csr
&= ~MUSB_TXCSR_P_UNDERRUN
;
469 musb_writew(epio
, MUSB_TXCSR
, csr
);
472 /* host may already have the data when this message shows... */
473 DBG(3, "%s TX/IN %s len %d/%d, txcsr %04x, fifo %d/%d\n",
474 musb_ep
->end_point
.name
, use_dma
? "dma" : "pio",
475 request
->actual
, request
->length
,
476 musb_readw(epio
, MUSB_TXCSR
),
478 musb_readw(epio
, MUSB_TXMAXP
));
482 * FIFO state update (e.g. data ready).
483 * Called from IRQ, with controller locked.
485 void musb_g_tx(struct musb
*musb
, u8 epnum
)
488 struct usb_request
*request
;
489 u8 __iomem
*mbase
= musb
->mregs
;
490 struct musb_ep
*musb_ep
= &musb
->endpoints
[epnum
].ep_in
;
491 void __iomem
*epio
= musb
->endpoints
[epnum
].regs
;
492 struct dma_channel
*dma
;
494 musb_ep_select(mbase
, epnum
);
495 request
= next_request(musb_ep
);
497 csr
= musb_readw(epio
, MUSB_TXCSR
);
498 DBG(4, "<== %s, txcsr %04x\n", musb_ep
->end_point
.name
, csr
);
500 dma
= is_dma_capable() ? musb_ep
->dma
: NULL
;
503 * REVISIT: for high bandwidth, MUSB_TXCSR_P_INCOMPTX
504 * probably rates reporting as a host error.
506 if (csr
& MUSB_TXCSR_P_SENTSTALL
) {
507 csr
|= MUSB_TXCSR_P_WZC_BITS
;
508 csr
&= ~MUSB_TXCSR_P_SENTSTALL
;
509 musb_writew(epio
, MUSB_TXCSR
, csr
);
513 if (csr
& MUSB_TXCSR_P_UNDERRUN
) {
514 /* We NAKed, no big deal... little reason to care. */
515 csr
|= MUSB_TXCSR_P_WZC_BITS
;
516 csr
&= ~(MUSB_TXCSR_P_UNDERRUN
| MUSB_TXCSR_TXPKTRDY
);
517 musb_writew(epio
, MUSB_TXCSR
, csr
);
518 DBG(20, "underrun on ep%d, req %p\n", epnum
, request
);
521 if (dma_channel_status(dma
) == MUSB_DMA_STATUS_BUSY
) {
523 * SHOULD NOT HAPPEN... has with CPPI though, after
524 * changing SENDSTALL (and other cases); harmless?
526 DBG(5, "%s dma still busy?\n", musb_ep
->end_point
.name
);
533 if (dma
&& (csr
& MUSB_TXCSR_DMAENAB
)) {
535 csr
|= MUSB_TXCSR_P_WZC_BITS
;
536 csr
&= ~(MUSB_TXCSR_DMAENAB
| MUSB_TXCSR_P_UNDERRUN
|
537 MUSB_TXCSR_TXPKTRDY
);
538 musb_writew(epio
, MUSB_TXCSR
, csr
);
539 /* Ensure writebuffer is empty. */
540 csr
= musb_readw(epio
, MUSB_TXCSR
);
541 request
->actual
+= musb_ep
->dma
->actual_len
;
542 DBG(4, "TXCSR%d %04x, DMA off, len %zu, req %p\n",
543 epnum
, csr
, musb_ep
->dma
->actual_len
, request
);
547 * First, maybe a terminating short packet. Some DMA
548 * engines might handle this by themselves.
550 if ((request
->zero
&& request
->length
551 && (request
->length
% musb_ep
->packet_sz
== 0)
552 && (request
->actual
== request
->length
))
553 #ifdef CONFIG_USB_INVENTRA_DMA
554 || (is_dma
&& (!dma
->desired_mode
||
556 (musb_ep
->packet_sz
- 1))))
560 * On DMA completion, FIFO may not be
563 if (csr
& MUSB_TXCSR_TXPKTRDY
)
566 DBG(4, "sending zero pkt\n");
567 musb_writew(epio
, MUSB_TXCSR
, MUSB_TXCSR_MODE
568 | MUSB_TXCSR_TXPKTRDY
);
572 if (request
->actual
== request
->length
) {
573 musb_g_giveback(musb_ep
, request
, 0);
574 request
= musb_ep
->desc
? next_request(musb_ep
) : NULL
;
576 DBG(4, "%s idle now\n",
577 musb_ep
->end_point
.name
);
582 txstate(musb
, to_musb_request(request
));
586 /* ------------------------------------------------------------ */
588 #ifdef CONFIG_USB_INVENTRA_DMA
590 /* Peripheral rx (OUT) using Mentor DMA works as follows:
591 - Only mode 0 is used.
593 - Request is queued by the gadget class driver.
594 -> if queue was previously empty, rxstate()
596 - Host sends OUT token which causes an endpoint interrupt
598 | -> if request queued, call rxstate
600 | | -> DMA interrupt on completion
604 | | -> if data recd = max expected
605 | | by the request, or host
606 | | sent a short packet,
607 | | complete the request,
608 | | and start the next one.
609 | |_____________________________________|
610 | else just wait for the host
611 | to send the next OUT token.
612 |__________________________________________________|
614 * Non-Mentor DMA engines can of course work differently.
620 * Context: controller locked, IRQs blocked, endpoint selected
622 static void rxstate(struct musb
*musb
, struct musb_request
*req
)
624 const u8 epnum
= req
->epnum
;
625 struct usb_request
*request
= &req
->request
;
626 struct musb_ep
*musb_ep
;
627 void __iomem
*epio
= musb
->endpoints
[epnum
].regs
;
628 unsigned fifo_count
= 0;
630 u16 csr
= musb_readw(epio
, MUSB_RXCSR
);
631 struct musb_hw_ep
*hw_ep
= &musb
->endpoints
[epnum
];
633 if (hw_ep
->is_shared_fifo
)
634 musb_ep
= &hw_ep
->ep_in
;
636 musb_ep
= &hw_ep
->ep_out
;
638 len
= musb_ep
->packet_sz
;
640 /* We shouldn't get here while DMA is active, but we do... */
641 if (dma_channel_status(musb_ep
->dma
) == MUSB_DMA_STATUS_BUSY
) {
642 DBG(4, "DMA pending...\n");
646 if (csr
& MUSB_RXCSR_P_SENDSTALL
) {
647 DBG(5, "%s stalling, RXCSR %04x\n",
648 musb_ep
->end_point
.name
, csr
);
652 if (is_cppi_enabled() && is_buffer_mapped(req
)) {
653 struct dma_controller
*c
= musb
->dma_controller
;
654 struct dma_channel
*channel
= musb_ep
->dma
;
656 /* NOTE: CPPI won't actually stop advancing the DMA
657 * queue after short packet transfers, so this is almost
658 * always going to run as IRQ-per-packet DMA so that
659 * faults will be handled correctly.
661 if (c
->channel_program(channel
,
663 !request
->short_not_ok
,
664 request
->dma
+ request
->actual
,
665 request
->length
- request
->actual
)) {
667 /* make sure that if an rxpkt arrived after the irq,
668 * the cppi engine will be ready to take it as soon
671 csr
&= ~(MUSB_RXCSR_AUTOCLEAR
672 | MUSB_RXCSR_DMAMODE
);
673 csr
|= MUSB_RXCSR_DMAENAB
| MUSB_RXCSR_P_WZC_BITS
;
674 musb_writew(epio
, MUSB_RXCSR
, csr
);
679 if (csr
& MUSB_RXCSR_RXPKTRDY
) {
680 len
= musb_readw(epio
, MUSB_RXCOUNT
);
681 if (request
->actual
< request
->length
) {
682 #ifdef CONFIG_USB_INVENTRA_DMA
683 if (is_buffer_mapped(req
)) {
684 struct dma_controller
*c
;
685 struct dma_channel
*channel
;
688 c
= musb
->dma_controller
;
689 channel
= musb_ep
->dma
;
691 /* We use DMA Req mode 0 in rx_csr, and DMA controller operates in
692 * mode 0 only. So we do not get endpoint interrupts due to DMA
693 * completion. We only get interrupts from DMA controller.
695 * We could operate in DMA mode 1 if we knew the size of the tranfer
696 * in advance. For mass storage class, request->length = what the host
697 * sends, so that'd work. But for pretty much everything else,
698 * request->length is routinely more than what the host sends. For
699 * most these gadgets, end of is signified either by a short packet,
700 * or filling the last byte of the buffer. (Sending extra data in
701 * that last pckate should trigger an overflow fault.) But in mode 1,
702 * we don't get DMA completion interrrupt for short packets.
704 * Theoretically, we could enable DMAReq irq (MUSB_RXCSR_DMAMODE = 1),
705 * to get endpoint interrupt on every DMA req, but that didn't seem
708 * REVISIT an updated g_file_storage can set req->short_not_ok, which
709 * then becomes usable as a runtime "use mode 1" hint...
712 csr
|= MUSB_RXCSR_DMAENAB
;
714 csr
|= MUSB_RXCSR_AUTOCLEAR
;
715 /* csr |= MUSB_RXCSR_DMAMODE; */
717 /* this special sequence (enabling and then
718 * disabling MUSB_RXCSR_DMAMODE) is required
719 * to get DMAReq to activate
721 musb_writew(epio
, MUSB_RXCSR
,
722 csr
| MUSB_RXCSR_DMAMODE
);
724 if (!musb_ep
->hb_mult
&&
725 musb_ep
->hw_ep
->rx_double_buffered
)
726 csr
|= MUSB_RXCSR_AUTOCLEAR
;
728 musb_writew(epio
, MUSB_RXCSR
, csr
);
730 if (request
->actual
< request
->length
) {
731 int transfer_size
= 0;
733 transfer_size
= min(request
->length
- request
->actual
,
736 transfer_size
= min(request
->length
- request
->actual
,
739 if (transfer_size
<= musb_ep
->packet_sz
)
740 musb_ep
->dma
->desired_mode
= 0;
742 musb_ep
->dma
->desired_mode
= 1;
744 use_dma
= c
->channel_program(
747 channel
->desired_mode
,
756 #endif /* Mentor's DMA */
758 fifo_count
= request
->length
- request
->actual
;
759 DBG(3, "%s OUT/RX pio fifo %d/%d, maxpacket %d\n",
760 musb_ep
->end_point
.name
,
764 fifo_count
= min_t(unsigned, len
, fifo_count
);
766 #ifdef CONFIG_USB_TUSB_OMAP_DMA
767 if (tusb_dma_omap() && is_buffer_mapped(req
)) {
768 struct dma_controller
*c
= musb
->dma_controller
;
769 struct dma_channel
*channel
= musb_ep
->dma
;
770 u32 dma_addr
= request
->dma
+ request
->actual
;
773 ret
= c
->channel_program(channel
,
775 channel
->desired_mode
,
783 * Unmap the dma buffer back to cpu if dma channel
784 * programming fails. This buffer is mapped if the
785 * channel allocation is successful
787 if (is_buffer_mapped(req
)) {
788 unmap_dma_buffer(req
, musb
);
791 * Clear DMAENAB and AUTOCLEAR for the
794 csr
&= ~(MUSB_RXCSR_DMAENAB
| MUSB_RXCSR_AUTOCLEAR
);
795 musb_writew(epio
, MUSB_RXCSR
, csr
);
798 musb_read_fifo(musb_ep
->hw_ep
, fifo_count
, (u8
*)
799 (request
->buf
+ request
->actual
));
800 request
->actual
+= fifo_count
;
802 /* REVISIT if we left anything in the fifo, flush
803 * it and report -EOVERFLOW
807 csr
|= MUSB_RXCSR_P_WZC_BITS
;
808 csr
&= ~MUSB_RXCSR_RXPKTRDY
;
809 musb_writew(epio
, MUSB_RXCSR
, csr
);
813 /* reach the end or short packet detected */
814 if (request
->actual
== request
->length
|| len
< musb_ep
->packet_sz
)
815 musb_g_giveback(musb_ep
, request
, 0);
819 * Data ready for a request; called from IRQ
821 void musb_g_rx(struct musb
*musb
, u8 epnum
)
824 struct usb_request
*request
;
825 void __iomem
*mbase
= musb
->mregs
;
826 struct musb_ep
*musb_ep
;
827 void __iomem
*epio
= musb
->endpoints
[epnum
].regs
;
828 struct dma_channel
*dma
;
829 struct musb_hw_ep
*hw_ep
= &musb
->endpoints
[epnum
];
831 if (hw_ep
->is_shared_fifo
)
832 musb_ep
= &hw_ep
->ep_in
;
834 musb_ep
= &hw_ep
->ep_out
;
836 musb_ep_select(mbase
, epnum
);
838 request
= next_request(musb_ep
);
842 csr
= musb_readw(epio
, MUSB_RXCSR
);
843 dma
= is_dma_capable() ? musb_ep
->dma
: NULL
;
845 DBG(4, "<== %s, rxcsr %04x%s %p\n", musb_ep
->end_point
.name
,
846 csr
, dma
? " (dma)" : "", request
);
848 if (csr
& MUSB_RXCSR_P_SENTSTALL
) {
849 csr
|= MUSB_RXCSR_P_WZC_BITS
;
850 csr
&= ~MUSB_RXCSR_P_SENTSTALL
;
851 musb_writew(epio
, MUSB_RXCSR
, csr
);
855 if (csr
& MUSB_RXCSR_P_OVERRUN
) {
856 /* csr |= MUSB_RXCSR_P_WZC_BITS; */
857 csr
&= ~MUSB_RXCSR_P_OVERRUN
;
858 musb_writew(epio
, MUSB_RXCSR
, csr
);
860 DBG(3, "%s iso overrun on %p\n", musb_ep
->name
, request
);
861 if (request
->status
== -EINPROGRESS
)
862 request
->status
= -EOVERFLOW
;
864 if (csr
& MUSB_RXCSR_INCOMPRX
) {
865 /* REVISIT not necessarily an error */
866 DBG(4, "%s, incomprx\n", musb_ep
->end_point
.name
);
869 if (dma_channel_status(dma
) == MUSB_DMA_STATUS_BUSY
) {
870 /* "should not happen"; likely RXPKTRDY pending for DMA */
871 DBG((csr
& MUSB_RXCSR_DMAENAB
) ? 4 : 1,
872 "%s busy, csr %04x\n",
873 musb_ep
->end_point
.name
, csr
);
877 if (dma
&& (csr
& MUSB_RXCSR_DMAENAB
)) {
878 csr
&= ~(MUSB_RXCSR_AUTOCLEAR
880 | MUSB_RXCSR_DMAMODE
);
881 musb_writew(epio
, MUSB_RXCSR
,
882 MUSB_RXCSR_P_WZC_BITS
| csr
);
884 request
->actual
+= musb_ep
->dma
->actual_len
;
886 DBG(4, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n",
888 musb_readw(epio
, MUSB_RXCSR
),
889 musb_ep
->dma
->actual_len
, request
);
891 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA)
892 /* Autoclear doesn't clear RxPktRdy for short packets */
893 if ((dma
->desired_mode
== 0 && !hw_ep
->rx_double_buffered
)
895 & (musb_ep
->packet_sz
- 1))) {
897 csr
&= ~MUSB_RXCSR_RXPKTRDY
;
898 musb_writew(epio
, MUSB_RXCSR
, csr
);
901 /* incomplete, and not short? wait for next IN packet */
902 if ((request
->actual
< request
->length
)
903 && (musb_ep
->dma
->actual_len
904 == musb_ep
->packet_sz
)) {
905 /* In double buffer case, continue to unload fifo if
906 * there is Rx packet in FIFO.
908 csr
= musb_readw(epio
, MUSB_RXCSR
);
909 if ((csr
& MUSB_RXCSR_RXPKTRDY
) &&
910 hw_ep
->rx_double_buffered
)
915 musb_g_giveback(musb_ep
, request
, 0);
917 request
= next_request(musb_ep
);
921 #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA)
924 /* Analyze request */
925 rxstate(musb
, to_musb_request(request
));
928 /* ------------------------------------------------------------ */
930 static int musb_gadget_enable(struct usb_ep
*ep
,
931 const struct usb_endpoint_descriptor
*desc
)
934 struct musb_ep
*musb_ep
;
935 struct musb_hw_ep
*hw_ep
;
942 int status
= -EINVAL
;
947 musb_ep
= to_musb_ep(ep
);
948 hw_ep
= musb_ep
->hw_ep
;
950 musb
= musb_ep
->musb
;
952 epnum
= musb_ep
->current_epnum
;
954 spin_lock_irqsave(&musb
->lock
, flags
);
960 musb_ep
->type
= usb_endpoint_type(desc
);
962 /* check direction and (later) maxpacket size against endpoint */
963 if (usb_endpoint_num(desc
) != epnum
)
966 /* REVISIT this rules out high bandwidth periodic transfers */
967 tmp
= le16_to_cpu(desc
->wMaxPacketSize
);
971 if (usb_endpoint_dir_in(desc
))
972 ok
= musb
->hb_iso_tx
;
974 ok
= musb
->hb_iso_rx
;
977 DBG(4, "%s: not support ISO high bandwidth\n", __func__
);
980 musb_ep
->hb_mult
= (tmp
>> 11) & 3;
982 musb_ep
->hb_mult
= 0;
985 musb_ep
->packet_sz
= tmp
& 0x7ff;
986 tmp
= musb_ep
->packet_sz
* (musb_ep
->hb_mult
+ 1);
988 /* enable the interrupts for the endpoint, set the endpoint
989 * packet size (or fail), set the mode, clear the fifo
991 musb_ep_select(mbase
, epnum
);
992 if (usb_endpoint_dir_in(desc
)) {
993 u16 int_txe
= musb_readw(mbase
, MUSB_INTRTXE
);
995 if (hw_ep
->is_shared_fifo
)
1000 if (tmp
> hw_ep
->max_packet_sz_tx
) {
1001 DBG(4, "%s: packet size beyond hw fifo size\n", __func__
);
1005 int_txe
|= (1 << epnum
);
1006 musb_writew(mbase
, MUSB_INTRTXE
, int_txe
);
1008 /* REVISIT if can_bulk_split(), use by updating "tmp";
1009 * likewise high bandwidth periodic tx
1011 /* Set TXMAXP with the FIFO size of the endpoint
1012 * to disable double buffering mode.
1014 if (musb
->double_buffer_not_ok
)
1015 musb_writew(regs
, MUSB_TXMAXP
, hw_ep
->max_packet_sz_tx
);
1017 musb_writew(regs
, MUSB_TXMAXP
, musb_ep
->packet_sz
1018 | (musb_ep
->hb_mult
<< 11));
1020 csr
= MUSB_TXCSR_MODE
| MUSB_TXCSR_CLRDATATOG
;
1021 if (musb_readw(regs
, MUSB_TXCSR
)
1022 & MUSB_TXCSR_FIFONOTEMPTY
)
1023 csr
|= MUSB_TXCSR_FLUSHFIFO
;
1024 if (musb_ep
->type
== USB_ENDPOINT_XFER_ISOC
)
1025 csr
|= MUSB_TXCSR_P_ISO
;
1027 /* set twice in case of double buffering */
1028 musb_writew(regs
, MUSB_TXCSR
, csr
);
1029 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1030 musb_writew(regs
, MUSB_TXCSR
, csr
);
1033 u16 int_rxe
= musb_readw(mbase
, MUSB_INTRRXE
);
1035 if (hw_ep
->is_shared_fifo
)
1040 if (tmp
> hw_ep
->max_packet_sz_rx
) {
1041 DBG(4, "%s: packet size beyond hw fifo size\n", __func__
);
1045 int_rxe
|= (1 << epnum
);
1046 musb_writew(mbase
, MUSB_INTRRXE
, int_rxe
);
1048 /* REVISIT if can_bulk_combine() use by updating "tmp"
1049 * likewise high bandwidth periodic rx
1051 /* Set RXMAXP with the FIFO size of the endpoint
1052 * to disable double buffering mode.
1054 if (musb
->double_buffer_not_ok
)
1055 musb_writew(regs
, MUSB_RXMAXP
, hw_ep
->max_packet_sz_tx
);
1057 musb_writew(regs
, MUSB_RXMAXP
, musb_ep
->packet_sz
1058 | (musb_ep
->hb_mult
<< 11));
1060 /* force shared fifo to OUT-only mode */
1061 if (hw_ep
->is_shared_fifo
) {
1062 csr
= musb_readw(regs
, MUSB_TXCSR
);
1063 csr
&= ~(MUSB_TXCSR_MODE
| MUSB_TXCSR_TXPKTRDY
);
1064 musb_writew(regs
, MUSB_TXCSR
, csr
);
1067 csr
= MUSB_RXCSR_FLUSHFIFO
| MUSB_RXCSR_CLRDATATOG
;
1068 if (musb_ep
->type
== USB_ENDPOINT_XFER_ISOC
)
1069 csr
|= MUSB_RXCSR_P_ISO
;
1070 else if (musb_ep
->type
== USB_ENDPOINT_XFER_INT
)
1071 csr
|= MUSB_RXCSR_DISNYET
;
1073 /* set twice in case of double buffering */
1074 musb_writew(regs
, MUSB_RXCSR
, csr
);
1075 musb_writew(regs
, MUSB_RXCSR
, csr
);
1078 /* NOTE: all the I/O code _should_ work fine without DMA, in case
1079 * for some reason you run out of channels here.
1081 if (is_dma_capable() && musb
->dma_controller
) {
1082 struct dma_controller
*c
= musb
->dma_controller
;
1084 musb_ep
->dma
= c
->channel_alloc(c
, hw_ep
,
1085 (desc
->bEndpointAddress
& USB_DIR_IN
));
1087 musb_ep
->dma
= NULL
;
1089 musb_ep
->desc
= desc
;
1091 musb_ep
->wedged
= 0;
1094 pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n",
1095 musb_driver_name
, musb_ep
->end_point
.name
,
1096 ({ char *s
; switch (musb_ep
->type
) {
1097 case USB_ENDPOINT_XFER_BULK
: s
= "bulk"; break;
1098 case USB_ENDPOINT_XFER_INT
: s
= "int"; break;
1099 default: s
= "iso"; break;
1101 musb_ep
->is_in
? "IN" : "OUT",
1102 musb_ep
->dma
? "dma, " : "",
1103 musb_ep
->packet_sz
);
1105 schedule_work(&musb
->irq_work
);
1108 spin_unlock_irqrestore(&musb
->lock
, flags
);
1113 * Disable an endpoint flushing all requests queued.
1115 static int musb_gadget_disable(struct usb_ep
*ep
)
1117 unsigned long flags
;
1120 struct musb_ep
*musb_ep
;
1124 musb_ep
= to_musb_ep(ep
);
1125 musb
= musb_ep
->musb
;
1126 epnum
= musb_ep
->current_epnum
;
1127 epio
= musb
->endpoints
[epnum
].regs
;
1129 spin_lock_irqsave(&musb
->lock
, flags
);
1130 musb_ep_select(musb
->mregs
, epnum
);
1132 /* zero the endpoint sizes */
1133 if (musb_ep
->is_in
) {
1134 u16 int_txe
= musb_readw(musb
->mregs
, MUSB_INTRTXE
);
1135 int_txe
&= ~(1 << epnum
);
1136 musb_writew(musb
->mregs
, MUSB_INTRTXE
, int_txe
);
1137 musb_writew(epio
, MUSB_TXMAXP
, 0);
1139 u16 int_rxe
= musb_readw(musb
->mregs
, MUSB_INTRRXE
);
1140 int_rxe
&= ~(1 << epnum
);
1141 musb_writew(musb
->mregs
, MUSB_INTRRXE
, int_rxe
);
1142 musb_writew(epio
, MUSB_RXMAXP
, 0);
1145 musb_ep
->desc
= NULL
;
1147 /* abort all pending DMA and requests */
1148 nuke(musb_ep
, -ESHUTDOWN
);
1150 schedule_work(&musb
->irq_work
);
1152 spin_unlock_irqrestore(&(musb
->lock
), flags
);
1154 DBG(2, "%s\n", musb_ep
->end_point
.name
);
1160 * Allocate a request for an endpoint.
1161 * Reused by ep0 code.
1163 struct usb_request
*musb_alloc_request(struct usb_ep
*ep
, gfp_t gfp_flags
)
1165 struct musb_ep
*musb_ep
= to_musb_ep(ep
);
1166 struct musb_request
*request
= NULL
;
1168 request
= kzalloc(sizeof *request
, gfp_flags
);
1170 DBG(4, "not enough memory\n");
1174 INIT_LIST_HEAD(&request
->request
.list
);
1175 request
->request
.dma
= DMA_ADDR_INVALID
;
1176 request
->epnum
= musb_ep
->current_epnum
;
1177 request
->ep
= musb_ep
;
1179 return &request
->request
;
1184 * Reused by ep0 code.
1186 void musb_free_request(struct usb_ep
*ep
, struct usb_request
*req
)
1188 kfree(to_musb_request(req
));
1191 static LIST_HEAD(buffers
);
1193 struct free_record
{
1194 struct list_head list
;
1201 * Context: controller locked, IRQs blocked.
1203 void musb_ep_restart(struct musb
*musb
, struct musb_request
*req
)
1205 DBG(3, "<== %s request %p len %u on hw_ep%d\n",
1206 req
->tx
? "TX/IN" : "RX/OUT",
1207 &req
->request
, req
->request
.length
, req
->epnum
);
1209 musb_ep_select(musb
->mregs
, req
->epnum
);
1216 static int musb_gadget_queue(struct usb_ep
*ep
, struct usb_request
*req
,
1219 struct musb_ep
*musb_ep
;
1220 struct musb_request
*request
;
1223 unsigned long lockflags
;
1230 musb_ep
= to_musb_ep(ep
);
1231 musb
= musb_ep
->musb
;
1233 request
= to_musb_request(req
);
1234 request
->musb
= musb
;
1236 if (request
->ep
!= musb_ep
)
1239 DBG(4, "<== to %s request=%p\n", ep
->name
, req
);
1241 /* request is mine now... */
1242 request
->request
.actual
= 0;
1243 request
->request
.status
= -EINPROGRESS
;
1244 request
->epnum
= musb_ep
->current_epnum
;
1245 request
->tx
= musb_ep
->is_in
;
1247 map_dma_buffer(request
, musb
, musb_ep
);
1249 spin_lock_irqsave(&musb
->lock
, lockflags
);
1251 /* don't queue if the ep is down */
1252 if (!musb_ep
->desc
) {
1253 DBG(4, "req %p queued to %s while ep %s\n",
1254 req
, ep
->name
, "disabled");
1255 status
= -ESHUTDOWN
;
1259 /* add request to the list */
1260 list_add_tail(&(request
->request
.list
), &(musb_ep
->req_list
));
1262 /* it this is the head of the queue, start i/o ... */
1263 if (!musb_ep
->busy
&& &request
->request
.list
== musb_ep
->req_list
.next
)
1264 musb_ep_restart(musb
, request
);
1267 spin_unlock_irqrestore(&musb
->lock
, lockflags
);
1271 static int musb_gadget_dequeue(struct usb_ep
*ep
, struct usb_request
*request
)
1273 struct musb_ep
*musb_ep
= to_musb_ep(ep
);
1274 struct usb_request
*r
;
1275 unsigned long flags
;
1277 struct musb
*musb
= musb_ep
->musb
;
1279 if (!ep
|| !request
|| to_musb_request(request
)->ep
!= musb_ep
)
1282 spin_lock_irqsave(&musb
->lock
, flags
);
1284 list_for_each_entry(r
, &musb_ep
->req_list
, list
) {
1289 DBG(3, "request %p not queued to %s\n", request
, ep
->name
);
1294 /* if the hardware doesn't have the request, easy ... */
1295 if (musb_ep
->req_list
.next
!= &request
->list
|| musb_ep
->busy
)
1296 musb_g_giveback(musb_ep
, request
, -ECONNRESET
);
1298 /* ... else abort the dma transfer ... */
1299 else if (is_dma_capable() && musb_ep
->dma
) {
1300 struct dma_controller
*c
= musb
->dma_controller
;
1302 musb_ep_select(musb
->mregs
, musb_ep
->current_epnum
);
1303 if (c
->channel_abort
)
1304 status
= c
->channel_abort(musb_ep
->dma
);
1308 musb_g_giveback(musb_ep
, request
, -ECONNRESET
);
1310 /* NOTE: by sticking to easily tested hardware/driver states,
1311 * we leave counting of in-flight packets imprecise.
1313 musb_g_giveback(musb_ep
, request
, -ECONNRESET
);
1317 spin_unlock_irqrestore(&musb
->lock
, flags
);
1322 * Set or clear the halt bit of an endpoint. A halted enpoint won't tx/rx any
1323 * data but will queue requests.
1325 * exported to ep0 code
1327 static int musb_gadget_set_halt(struct usb_ep
*ep
, int value
)
1329 struct musb_ep
*musb_ep
= to_musb_ep(ep
);
1330 u8 epnum
= musb_ep
->current_epnum
;
1331 struct musb
*musb
= musb_ep
->musb
;
1332 void __iomem
*epio
= musb
->endpoints
[epnum
].regs
;
1333 void __iomem
*mbase
;
1334 unsigned long flags
;
1336 struct musb_request
*request
;
1341 mbase
= musb
->mregs
;
1343 spin_lock_irqsave(&musb
->lock
, flags
);
1345 if ((USB_ENDPOINT_XFER_ISOC
== musb_ep
->type
)) {
1350 musb_ep_select(mbase
, epnum
);
1352 request
= to_musb_request(next_request(musb_ep
));
1355 DBG(3, "request in progress, cannot halt %s\n",
1360 /* Cannot portably stall with non-empty FIFO */
1361 if (musb_ep
->is_in
) {
1362 csr
= musb_readw(epio
, MUSB_TXCSR
);
1363 if (csr
& MUSB_TXCSR_FIFONOTEMPTY
) {
1364 DBG(3, "FIFO busy, cannot halt %s\n", ep
->name
);
1370 musb_ep
->wedged
= 0;
1372 /* set/clear the stall and toggle bits */
1373 DBG(2, "%s: %s stall\n", ep
->name
, value
? "set" : "clear");
1374 if (musb_ep
->is_in
) {
1375 csr
= musb_readw(epio
, MUSB_TXCSR
);
1376 csr
|= MUSB_TXCSR_P_WZC_BITS
1377 | MUSB_TXCSR_CLRDATATOG
;
1379 csr
|= MUSB_TXCSR_P_SENDSTALL
;
1381 csr
&= ~(MUSB_TXCSR_P_SENDSTALL
1382 | MUSB_TXCSR_P_SENTSTALL
);
1383 csr
&= ~MUSB_TXCSR_TXPKTRDY
;
1384 musb_writew(epio
, MUSB_TXCSR
, csr
);
1386 csr
= musb_readw(epio
, MUSB_RXCSR
);
1387 csr
|= MUSB_RXCSR_P_WZC_BITS
1388 | MUSB_RXCSR_FLUSHFIFO
1389 | MUSB_RXCSR_CLRDATATOG
;
1391 csr
|= MUSB_RXCSR_P_SENDSTALL
;
1393 csr
&= ~(MUSB_RXCSR_P_SENDSTALL
1394 | MUSB_RXCSR_P_SENTSTALL
);
1395 musb_writew(epio
, MUSB_RXCSR
, csr
);
1398 /* maybe start the first request in the queue */
1399 if (!musb_ep
->busy
&& !value
&& request
) {
1400 DBG(3, "restarting the request\n");
1401 musb_ep_restart(musb
, request
);
1405 spin_unlock_irqrestore(&musb
->lock
, flags
);
1410 * Sets the halt feature with the clear requests ignored
1412 static int musb_gadget_set_wedge(struct usb_ep
*ep
)
1414 struct musb_ep
*musb_ep
= to_musb_ep(ep
);
1419 musb_ep
->wedged
= 1;
1421 return usb_ep_set_halt(ep
);
1424 static int musb_gadget_fifo_status(struct usb_ep
*ep
)
1426 struct musb_ep
*musb_ep
= to_musb_ep(ep
);
1427 void __iomem
*epio
= musb_ep
->hw_ep
->regs
;
1428 int retval
= -EINVAL
;
1430 if (musb_ep
->desc
&& !musb_ep
->is_in
) {
1431 struct musb
*musb
= musb_ep
->musb
;
1432 int epnum
= musb_ep
->current_epnum
;
1433 void __iomem
*mbase
= musb
->mregs
;
1434 unsigned long flags
;
1436 spin_lock_irqsave(&musb
->lock
, flags
);
1438 musb_ep_select(mbase
, epnum
);
1439 /* FIXME return zero unless RXPKTRDY is set */
1440 retval
= musb_readw(epio
, MUSB_RXCOUNT
);
1442 spin_unlock_irqrestore(&musb
->lock
, flags
);
1447 static void musb_gadget_fifo_flush(struct usb_ep
*ep
)
1449 struct musb_ep
*musb_ep
= to_musb_ep(ep
);
1450 struct musb
*musb
= musb_ep
->musb
;
1451 u8 epnum
= musb_ep
->current_epnum
;
1452 void __iomem
*epio
= musb
->endpoints
[epnum
].regs
;
1453 void __iomem
*mbase
;
1454 unsigned long flags
;
1457 mbase
= musb
->mregs
;
1459 spin_lock_irqsave(&musb
->lock
, flags
);
1460 musb_ep_select(mbase
, (u8
) epnum
);
1462 /* disable interrupts */
1463 int_txe
= musb_readw(mbase
, MUSB_INTRTXE
);
1464 musb_writew(mbase
, MUSB_INTRTXE
, int_txe
& ~(1 << epnum
));
1466 if (musb_ep
->is_in
) {
1467 csr
= musb_readw(epio
, MUSB_TXCSR
);
1468 if (csr
& MUSB_TXCSR_FIFONOTEMPTY
) {
1469 csr
|= MUSB_TXCSR_FLUSHFIFO
| MUSB_TXCSR_P_WZC_BITS
;
1470 musb_writew(epio
, MUSB_TXCSR
, csr
);
1471 /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */
1472 musb_writew(epio
, MUSB_TXCSR
, csr
);
1475 csr
= musb_readw(epio
, MUSB_RXCSR
);
1476 csr
|= MUSB_RXCSR_FLUSHFIFO
| MUSB_RXCSR_P_WZC_BITS
;
1477 musb_writew(epio
, MUSB_RXCSR
, csr
);
1478 musb_writew(epio
, MUSB_RXCSR
, csr
);
1481 /* re-enable interrupt */
1482 musb_writew(mbase
, MUSB_INTRTXE
, int_txe
);
1483 spin_unlock_irqrestore(&musb
->lock
, flags
);
1486 static const struct usb_ep_ops musb_ep_ops
= {
1487 .enable
= musb_gadget_enable
,
1488 .disable
= musb_gadget_disable
,
1489 .alloc_request
= musb_alloc_request
,
1490 .free_request
= musb_free_request
,
1491 .queue
= musb_gadget_queue
,
1492 .dequeue
= musb_gadget_dequeue
,
1493 .set_halt
= musb_gadget_set_halt
,
1494 .set_wedge
= musb_gadget_set_wedge
,
1495 .fifo_status
= musb_gadget_fifo_status
,
1496 .fifo_flush
= musb_gadget_fifo_flush
1499 /* ----------------------------------------------------------------------- */
1501 static int musb_gadget_get_frame(struct usb_gadget
*gadget
)
1503 struct musb
*musb
= gadget_to_musb(gadget
);
1505 return (int)musb_readw(musb
->mregs
, MUSB_FRAME
);
1508 static int musb_gadget_wakeup(struct usb_gadget
*gadget
)
1510 struct musb
*musb
= gadget_to_musb(gadget
);
1511 void __iomem
*mregs
= musb
->mregs
;
1512 unsigned long flags
;
1513 int status
= -EINVAL
;
1517 spin_lock_irqsave(&musb
->lock
, flags
);
1519 switch (musb
->xceiv
->state
) {
1520 case OTG_STATE_B_PERIPHERAL
:
1521 /* NOTE: OTG state machine doesn't include B_SUSPENDED;
1522 * that's part of the standard usb 1.1 state machine, and
1523 * doesn't affect OTG transitions.
1525 if (musb
->may_wakeup
&& musb
->is_suspended
)
1528 case OTG_STATE_B_IDLE
:
1529 /* Start SRP ... OTG not required. */
1530 devctl
= musb_readb(mregs
, MUSB_DEVCTL
);
1531 DBG(2, "Sending SRP: devctl: %02x\n", devctl
);
1532 devctl
|= MUSB_DEVCTL_SESSION
;
1533 musb_writeb(mregs
, MUSB_DEVCTL
, devctl
);
1534 devctl
= musb_readb(mregs
, MUSB_DEVCTL
);
1536 while (!(devctl
& MUSB_DEVCTL_SESSION
)) {
1537 devctl
= musb_readb(mregs
, MUSB_DEVCTL
);
1542 while (devctl
& MUSB_DEVCTL_SESSION
) {
1543 devctl
= musb_readb(mregs
, MUSB_DEVCTL
);
1548 /* Block idling for at least 1s */
1549 musb_platform_try_idle(musb
,
1550 jiffies
+ msecs_to_jiffies(1 * HZ
));
1555 DBG(2, "Unhandled wake: %s\n", otg_state_string(musb
));
1561 power
= musb_readb(mregs
, MUSB_POWER
);
1562 power
|= MUSB_POWER_RESUME
;
1563 musb_writeb(mregs
, MUSB_POWER
, power
);
1564 DBG(2, "issue wakeup\n");
1566 /* FIXME do this next chunk in a timer callback, no udelay */
1569 power
= musb_readb(mregs
, MUSB_POWER
);
1570 power
&= ~MUSB_POWER_RESUME
;
1571 musb_writeb(mregs
, MUSB_POWER
, power
);
1573 spin_unlock_irqrestore(&musb
->lock
, flags
);
1578 musb_gadget_set_self_powered(struct usb_gadget
*gadget
, int is_selfpowered
)
1580 struct musb
*musb
= gadget_to_musb(gadget
);
1582 musb
->is_self_powered
= !!is_selfpowered
;
1586 static void musb_pullup(struct musb
*musb
, int is_on
)
1590 power
= musb_readb(musb
->mregs
, MUSB_POWER
);
1592 power
|= MUSB_POWER_SOFTCONN
;
1594 power
&= ~MUSB_POWER_SOFTCONN
;
1596 /* FIXME if on, HdrcStart; if off, HdrcStop */
1598 DBG(3, "gadget %s D+ pullup %s\n",
1599 musb
->gadget_driver
->function
, is_on
? "on" : "off");
1600 musb_writeb(musb
->mregs
, MUSB_POWER
, power
);
1604 static int musb_gadget_vbus_session(struct usb_gadget
*gadget
, int is_active
)
1606 DBG(2, "<= %s =>\n", __func__
);
1609 * FIXME iff driver's softconnect flag is set (as it is during probe,
1610 * though that can clear it), just musb_pullup().
1617 static int musb_gadget_vbus_draw(struct usb_gadget
*gadget
, unsigned mA
)
1619 struct musb
*musb
= gadget_to_musb(gadget
);
1621 if (!musb
->xceiv
->set_power
)
1623 return otg_set_power(musb
->xceiv
, mA
);
1626 static int musb_gadget_pullup(struct usb_gadget
*gadget
, int is_on
)
1628 struct musb
*musb
= gadget_to_musb(gadget
);
1629 unsigned long flags
;
1633 /* NOTE: this assumes we are sensing vbus; we'd rather
1634 * not pullup unless the B-session is active.
1636 spin_lock_irqsave(&musb
->lock
, flags
);
1637 if (is_on
!= musb
->softconnect
) {
1638 musb
->softconnect
= is_on
;
1639 musb_pullup(musb
, is_on
);
1641 spin_unlock_irqrestore(&musb
->lock
, flags
);
1645 static const struct usb_gadget_ops musb_gadget_operations
= {
1646 .get_frame
= musb_gadget_get_frame
,
1647 .wakeup
= musb_gadget_wakeup
,
1648 .set_selfpowered
= musb_gadget_set_self_powered
,
1649 /* .vbus_session = musb_gadget_vbus_session, */
1650 .vbus_draw
= musb_gadget_vbus_draw
,
1651 .pullup
= musb_gadget_pullup
,
1654 /* ----------------------------------------------------------------------- */
1658 /* Only this registration code "knows" the rule (from USB standards)
1659 * about there being only one external upstream port. It assumes
1660 * all peripheral ports are external...
1662 static struct musb
*the_gadget
;
1664 static void musb_gadget_release(struct device
*dev
)
1666 /* kref_put(WHAT) */
1667 dev_dbg(dev
, "%s\n", __func__
);
1672 init_peripheral_ep(struct musb
*musb
, struct musb_ep
*ep
, u8 epnum
, int is_in
)
1674 struct musb_hw_ep
*hw_ep
= musb
->endpoints
+ epnum
;
1676 memset(ep
, 0, sizeof *ep
);
1678 ep
->current_epnum
= epnum
;
1683 INIT_LIST_HEAD(&ep
->req_list
);
1685 sprintf(ep
->name
, "ep%d%s", epnum
,
1686 (!epnum
|| hw_ep
->is_shared_fifo
) ? "" : (
1687 is_in
? "in" : "out"));
1688 ep
->end_point
.name
= ep
->name
;
1689 INIT_LIST_HEAD(&ep
->end_point
.ep_list
);
1691 ep
->end_point
.maxpacket
= 64;
1692 ep
->end_point
.ops
= &musb_g_ep0_ops
;
1693 musb
->g
.ep0
= &ep
->end_point
;
1696 ep
->end_point
.maxpacket
= hw_ep
->max_packet_sz_tx
;
1698 ep
->end_point
.maxpacket
= hw_ep
->max_packet_sz_rx
;
1699 ep
->end_point
.ops
= &musb_ep_ops
;
1700 list_add_tail(&ep
->end_point
.ep_list
, &musb
->g
.ep_list
);
1705 * Initialize the endpoints exposed to peripheral drivers, with backlinks
1706 * to the rest of the driver state.
1708 static inline void __init
musb_g_init_endpoints(struct musb
*musb
)
1711 struct musb_hw_ep
*hw_ep
;
1714 /* initialize endpoint list just once */
1715 INIT_LIST_HEAD(&(musb
->g
.ep_list
));
1717 for (epnum
= 0, hw_ep
= musb
->endpoints
;
1718 epnum
< musb
->nr_endpoints
;
1720 if (hw_ep
->is_shared_fifo
/* || !epnum */) {
1721 init_peripheral_ep(musb
, &hw_ep
->ep_in
, epnum
, 0);
1724 if (hw_ep
->max_packet_sz_tx
) {
1725 init_peripheral_ep(musb
, &hw_ep
->ep_in
,
1729 if (hw_ep
->max_packet_sz_rx
) {
1730 init_peripheral_ep(musb
, &hw_ep
->ep_out
,
1738 /* called once during driver setup to initialize and link into
1739 * the driver model; memory is zeroed.
1741 int __init
musb_gadget_setup(struct musb
*musb
)
1745 /* REVISIT minor race: if (erroneously) setting up two
1746 * musb peripherals at the same time, only the bus lock
1753 musb
->g
.ops
= &musb_gadget_operations
;
1754 musb
->g
.is_dualspeed
= 1;
1755 musb
->g
.speed
= USB_SPEED_UNKNOWN
;
1757 /* this "gadget" abstracts/virtualizes the controller */
1758 dev_set_name(&musb
->g
.dev
, "gadget");
1759 musb
->g
.dev
.parent
= musb
->controller
;
1760 musb
->g
.dev
.dma_mask
= musb
->controller
->dma_mask
;
1761 musb
->g
.dev
.release
= musb_gadget_release
;
1762 musb
->g
.name
= musb_driver_name
;
1764 if (is_otg_enabled(musb
))
1767 musb_g_init_endpoints(musb
);
1769 musb
->is_active
= 0;
1770 musb_platform_try_idle(musb
, 0);
1772 status
= device_register(&musb
->g
.dev
);
1774 put_device(&musb
->g
.dev
);
1780 void musb_gadget_cleanup(struct musb
*musb
)
1782 if (musb
!= the_gadget
)
1785 device_unregister(&musb
->g
.dev
);
1790 * Register the gadget driver. Used by gadget drivers when
1791 * registering themselves with the controller.
1793 * -EINVAL something went wrong (not driver)
1794 * -EBUSY another gadget is already using the controller
1795 * -ENOMEM no memory to perform the operation
1797 * @param driver the gadget driver
1798 * @param bind the driver's bind function
1799 * @return <0 if error, 0 if everything is fine
1801 int usb_gadget_probe_driver(struct usb_gadget_driver
*driver
,
1802 int (*bind
)(struct usb_gadget
*))
1805 unsigned long flags
;
1806 struct musb
*musb
= the_gadget
;
1809 || driver
->speed
!= USB_SPEED_HIGH
1810 || !bind
|| !driver
->setup
)
1813 /* driver must be initialized to support peripheral mode */
1815 DBG(1, "%s, no dev??\n", __func__
);
1819 DBG(3, "registering driver %s\n", driver
->function
);
1820 spin_lock_irqsave(&musb
->lock
, flags
);
1822 if (musb
->gadget_driver
) {
1823 DBG(1, "%s is already bound to %s\n",
1825 musb
->gadget_driver
->driver
.name
);
1828 musb
->gadget_driver
= driver
;
1829 musb
->g
.dev
.driver
= &driver
->driver
;
1830 driver
->driver
.bus
= NULL
;
1831 musb
->softconnect
= 1;
1835 spin_unlock_irqrestore(&musb
->lock
, flags
);
1838 retval
= bind(&musb
->g
);
1840 DBG(3, "bind to driver %s failed --> %d\n",
1841 driver
->driver
.name
, retval
);
1842 musb
->gadget_driver
= NULL
;
1843 musb
->g
.dev
.driver
= NULL
;
1846 spin_lock_irqsave(&musb
->lock
, flags
);
1848 otg_set_peripheral(musb
->xceiv
, &musb
->g
);
1849 musb
->xceiv
->state
= OTG_STATE_B_IDLE
;
1850 musb
->is_active
= 1;
1852 /* FIXME this ignores the softconnect flag. Drivers are
1853 * allowed hold the peripheral inactive until for example
1854 * userspace hooks up printer hardware or DSP codecs, so
1855 * hosts only see fully functional devices.
1858 if (!is_otg_enabled(musb
))
1861 otg_set_peripheral(musb
->xceiv
, &musb
->g
);
1863 spin_unlock_irqrestore(&musb
->lock
, flags
);
1865 if (is_otg_enabled(musb
)) {
1866 struct usb_hcd
*hcd
= musb_to_hcd(musb
);
1868 DBG(3, "OTG startup...\n");
1870 /* REVISIT: funcall to other code, which also
1871 * handles power budgeting ... this way also
1872 * ensures HdrcStart is indirectly called.
1874 retval
= usb_add_hcd(musb_to_hcd(musb
), -1, 0);
1876 DBG(1, "add_hcd failed, %d\n", retval
);
1877 spin_lock_irqsave(&musb
->lock
, flags
);
1878 otg_set_peripheral(musb
->xceiv
, NULL
);
1879 musb
->gadget_driver
= NULL
;
1880 musb
->g
.dev
.driver
= NULL
;
1881 spin_unlock_irqrestore(&musb
->lock
, flags
);
1883 hcd
->self
.uses_pio_for_control
= 1;
1890 EXPORT_SYMBOL(usb_gadget_probe_driver
);
1892 static void stop_activity(struct musb
*musb
, struct usb_gadget_driver
*driver
)
1895 struct musb_hw_ep
*hw_ep
;
1897 /* don't disconnect if it's not connected */
1898 if (musb
->g
.speed
== USB_SPEED_UNKNOWN
)
1901 musb
->g
.speed
= USB_SPEED_UNKNOWN
;
1903 /* deactivate the hardware */
1904 if (musb
->softconnect
) {
1905 musb
->softconnect
= 0;
1906 musb_pullup(musb
, 0);
1910 /* killing any outstanding requests will quiesce the driver;
1911 * then report disconnect
1914 for (i
= 0, hw_ep
= musb
->endpoints
;
1915 i
< musb
->nr_endpoints
;
1917 musb_ep_select(musb
->mregs
, i
);
1918 if (hw_ep
->is_shared_fifo
/* || !epnum */) {
1919 nuke(&hw_ep
->ep_in
, -ESHUTDOWN
);
1921 if (hw_ep
->max_packet_sz_tx
)
1922 nuke(&hw_ep
->ep_in
, -ESHUTDOWN
);
1923 if (hw_ep
->max_packet_sz_rx
)
1924 nuke(&hw_ep
->ep_out
, -ESHUTDOWN
);
1928 spin_unlock(&musb
->lock
);
1929 driver
->disconnect(&musb
->g
);
1930 spin_lock(&musb
->lock
);
1935 * Unregister the gadget driver. Used by gadget drivers when
1936 * unregistering themselves from the controller.
1938 * @param driver the gadget driver to unregister
1940 int usb_gadget_unregister_driver(struct usb_gadget_driver
*driver
)
1942 unsigned long flags
;
1944 struct musb
*musb
= the_gadget
;
1946 if (!driver
|| !driver
->unbind
|| !musb
)
1949 /* REVISIT always use otg_set_peripheral() here too;
1950 * this needs to shut down the OTG engine.
1953 spin_lock_irqsave(&musb
->lock
, flags
);
1955 #ifdef CONFIG_USB_MUSB_OTG
1956 musb_hnp_stop(musb
);
1959 if (musb
->gadget_driver
== driver
) {
1961 (void) musb_gadget_vbus_draw(&musb
->g
, 0);
1963 musb
->xceiv
->state
= OTG_STATE_UNDEFINED
;
1964 stop_activity(musb
, driver
);
1965 otg_set_peripheral(musb
->xceiv
, NULL
);
1967 DBG(3, "unregistering driver %s\n", driver
->function
);
1968 spin_unlock_irqrestore(&musb
->lock
, flags
);
1969 driver
->unbind(&musb
->g
);
1970 spin_lock_irqsave(&musb
->lock
, flags
);
1972 musb
->gadget_driver
= NULL
;
1973 musb
->g
.dev
.driver
= NULL
;
1975 musb
->is_active
= 0;
1976 musb_platform_try_idle(musb
, 0);
1979 spin_unlock_irqrestore(&musb
->lock
, flags
);
1981 if (is_otg_enabled(musb
) && retval
== 0) {
1982 usb_remove_hcd(musb_to_hcd(musb
));
1983 /* FIXME we need to be able to register another
1984 * gadget driver here and have everything work;
1985 * that currently misbehaves.
1991 EXPORT_SYMBOL(usb_gadget_unregister_driver
);
1994 /* ----------------------------------------------------------------------- */
1996 /* lifecycle operations called through plat_uds.c */
1998 void musb_g_resume(struct musb
*musb
)
2000 musb
->is_suspended
= 0;
2001 switch (musb
->xceiv
->state
) {
2002 case OTG_STATE_B_IDLE
:
2004 case OTG_STATE_B_WAIT_ACON
:
2005 case OTG_STATE_B_PERIPHERAL
:
2006 musb
->is_active
= 1;
2007 if (musb
->gadget_driver
&& musb
->gadget_driver
->resume
) {
2008 spin_unlock(&musb
->lock
);
2009 musb
->gadget_driver
->resume(&musb
->g
);
2010 spin_lock(&musb
->lock
);
2014 WARNING("unhandled RESUME transition (%s)\n",
2015 otg_state_string(musb
));
2019 /* called when SOF packets stop for 3+ msec */
2020 void musb_g_suspend(struct musb
*musb
)
2024 devctl
= musb_readb(musb
->mregs
, MUSB_DEVCTL
);
2025 DBG(3, "devctl %02x\n", devctl
);
2027 switch (musb
->xceiv
->state
) {
2028 case OTG_STATE_B_IDLE
:
2029 if ((devctl
& MUSB_DEVCTL_VBUS
) == MUSB_DEVCTL_VBUS
)
2030 musb
->xceiv
->state
= OTG_STATE_B_PERIPHERAL
;
2032 case OTG_STATE_B_PERIPHERAL
:
2033 musb
->is_suspended
= 1;
2034 if (musb
->gadget_driver
&& musb
->gadget_driver
->suspend
) {
2035 spin_unlock(&musb
->lock
);
2036 musb
->gadget_driver
->suspend(&musb
->g
);
2037 spin_lock(&musb
->lock
);
2041 /* REVISIT if B_HOST, clear DEVCTL.HOSTREQ;
2042 * A_PERIPHERAL may need care too
2044 WARNING("unhandled SUSPEND transition (%s)\n",
2045 otg_state_string(musb
));
2049 /* Called during SRP */
2050 void musb_g_wakeup(struct musb
*musb
)
2052 musb_gadget_wakeup(&musb
->g
);
2055 /* called when VBUS drops below session threshold, and in other cases */
2056 void musb_g_disconnect(struct musb
*musb
)
2058 void __iomem
*mregs
= musb
->mregs
;
2059 u8 devctl
= musb_readb(mregs
, MUSB_DEVCTL
);
2061 DBG(3, "devctl %02x\n", devctl
);
2064 musb_writeb(mregs
, MUSB_DEVCTL
, devctl
& MUSB_DEVCTL_SESSION
);
2066 /* don't draw vbus until new b-default session */
2067 (void) musb_gadget_vbus_draw(&musb
->g
, 0);
2069 musb
->g
.speed
= USB_SPEED_UNKNOWN
;
2070 if (musb
->gadget_driver
&& musb
->gadget_driver
->disconnect
) {
2071 spin_unlock(&musb
->lock
);
2072 musb
->gadget_driver
->disconnect(&musb
->g
);
2073 spin_lock(&musb
->lock
);
2076 switch (musb
->xceiv
->state
) {
2078 #ifdef CONFIG_USB_MUSB_OTG
2079 DBG(2, "Unhandled disconnect %s, setting a_idle\n",
2080 otg_state_string(musb
));
2081 musb
->xceiv
->state
= OTG_STATE_A_IDLE
;
2082 MUSB_HST_MODE(musb
);
2084 case OTG_STATE_A_PERIPHERAL
:
2085 musb
->xceiv
->state
= OTG_STATE_A_WAIT_BCON
;
2086 MUSB_HST_MODE(musb
);
2088 case OTG_STATE_B_WAIT_ACON
:
2089 case OTG_STATE_B_HOST
:
2091 case OTG_STATE_B_PERIPHERAL
:
2092 case OTG_STATE_B_IDLE
:
2093 musb
->xceiv
->state
= OTG_STATE_B_IDLE
;
2095 case OTG_STATE_B_SRP_INIT
:
2099 musb
->is_active
= 0;
2102 void musb_g_reset(struct musb
*musb
)
2103 __releases(musb
->lock
)
2104 __acquires(musb
->lock
)
2106 void __iomem
*mbase
= musb
->mregs
;
2107 u8 devctl
= musb_readb(mbase
, MUSB_DEVCTL
);
2110 DBG(3, "<== %s addr=%x driver '%s'\n",
2111 (devctl
& MUSB_DEVCTL_BDEVICE
)
2112 ? "B-Device" : "A-Device",
2113 musb_readb(mbase
, MUSB_FADDR
),
2115 ? musb
->gadget_driver
->driver
.name
2119 /* report disconnect, if we didn't already (flushing EP state) */
2120 if (musb
->g
.speed
!= USB_SPEED_UNKNOWN
)
2121 musb_g_disconnect(musb
);
2124 else if (devctl
& MUSB_DEVCTL_HR
)
2125 musb_writeb(mbase
, MUSB_DEVCTL
, MUSB_DEVCTL_SESSION
);
2128 /* what speed did we negotiate? */
2129 power
= musb_readb(mbase
, MUSB_POWER
);
2130 musb
->g
.speed
= (power
& MUSB_POWER_HSMODE
)
2131 ? USB_SPEED_HIGH
: USB_SPEED_FULL
;
2133 /* start in USB_STATE_DEFAULT */
2134 musb
->is_active
= 1;
2135 musb
->is_suspended
= 0;
2136 MUSB_DEV_MODE(musb
);
2138 musb
->ep0_state
= MUSB_EP0_STAGE_SETUP
;
2140 musb
->may_wakeup
= 0;
2141 musb
->g
.b_hnp_enable
= 0;
2142 musb
->g
.a_alt_hnp_support
= 0;
2143 musb
->g
.a_hnp_support
= 0;
2145 /* Normal reset, as B-Device;
2146 * or else after HNP, as A-Device
2148 if (devctl
& MUSB_DEVCTL_BDEVICE
) {
2149 musb
->xceiv
->state
= OTG_STATE_B_PERIPHERAL
;
2150 musb
->g
.is_a_peripheral
= 0;
2151 } else if (is_otg_enabled(musb
)) {
2152 musb
->xceiv
->state
= OTG_STATE_A_PERIPHERAL
;
2153 musb
->g
.is_a_peripheral
= 1;
2157 /* start with default limits on VBUS power draw */
2158 (void) musb_gadget_vbus_draw(&musb
->g
,
2159 is_otg_enabled(musb
) ? 8 : 100);