Commit | Line | Data |
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550a7375 FB |
1 | /* |
2 | * MUSB OTG driver peripheral support | |
3 | * | |
4 | * Copyright 2005 Mentor Graphics Corporation | |
5 | * Copyright (C) 2005-2006 by Texas Instruments | |
6 | * Copyright (C) 2006-2007 Nokia Corporation | |
cea83241 | 7 | * Copyright (C) 2009 MontaVista Software, Inc. <source@mvista.com> |
550a7375 FB |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
21 | * 02110-1301 USA | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED | |
24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
26 | * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
29 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
30 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | * | |
34 | */ | |
35 | ||
36 | #include <linux/kernel.h> | |
37 | #include <linux/list.h> | |
38 | #include <linux/timer.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/smp.h> | |
41 | #include <linux/spinlock.h> | |
42 | #include <linux/delay.h> | |
550a7375 | 43 | #include <linux/dma-mapping.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
550a7375 FB |
45 | |
46 | #include "musb_core.h" | |
47 | ||
48 | ||
49 | /* MUSB PERIPHERAL status 3-mar-2006: | |
50 | * | |
51 | * - EP0 seems solid. It passes both USBCV and usbtest control cases. | |
52 | * Minor glitches: | |
53 | * | |
54 | * + remote wakeup to Linux hosts work, but saw USBCV failures; | |
55 | * in one test run (operator error?) | |
56 | * + endpoint halt tests -- in both usbtest and usbcv -- seem | |
57 | * to break when dma is enabled ... is something wrongly | |
58 | * clearing SENDSTALL? | |
59 | * | |
60 | * - Mass storage behaved ok when last tested. Network traffic patterns | |
61 | * (with lots of short transfers etc) need retesting; they turn up the | |
62 | * worst cases of the DMA, since short packets are typical but are not | |
63 | * required. | |
64 | * | |
65 | * - TX/IN | |
66 | * + both pio and dma behave in with network and g_zero tests | |
67 | * + no cppi throughput issues other than no-hw-queueing | |
68 | * + failed with FLAT_REG (DaVinci) | |
69 | * + seems to behave with double buffering, PIO -and- CPPI | |
70 | * + with gadgetfs + AIO, requests got lost? | |
71 | * | |
72 | * - RX/OUT | |
73 | * + both pio and dma behave in with network and g_zero tests | |
74 | * + dma is slow in typical case (short_not_ok is clear) | |
75 | * + double buffering ok with PIO | |
76 | * + double buffering *FAILS* with CPPI, wrong data bytes sometimes | |
77 | * + request lossage observed with gadgetfs | |
78 | * | |
79 | * - ISO not tested ... might work, but only weakly isochronous | |
80 | * | |
81 | * - Gadget driver disabling of softconnect during bind() is ignored; so | |
82 | * drivers can't hold off host requests until userspace is ready. | |
83 | * (Workaround: they can turn it off later.) | |
84 | * | |
85 | * - PORTABILITY (assumes PIO works): | |
86 | * + DaVinci, basically works with cppi dma | |
87 | * + OMAP 2430, ditto with mentor dma | |
88 | * + TUSB 6010, platform-specific dma in the works | |
89 | */ | |
90 | ||
91 | /* ----------------------------------------------------------------------- */ | |
92 | ||
c65bfa62 MYK |
93 | #define is_buffer_mapped(req) (is_dma_capable() && \ |
94 | (req->map_state != UN_MAPPED)) | |
95 | ||
92d2711f HK |
96 | /* Maps the buffer to dma */ |
97 | ||
98 | static inline void map_dma_buffer(struct musb_request *request, | |
c65bfa62 | 99 | struct musb *musb, struct musb_ep *musb_ep) |
92d2711f | 100 | { |
5f5761cb MYK |
101 | int compatible = true; |
102 | struct dma_controller *dma = musb->dma_controller; | |
103 | ||
c65bfa62 MYK |
104 | request->map_state = UN_MAPPED; |
105 | ||
106 | if (!is_dma_capable() || !musb_ep->dma) | |
107 | return; | |
108 | ||
5f5761cb MYK |
109 | /* Check if DMA engine can handle this request. |
110 | * DMA code must reject the USB request explicitly. | |
111 | * Default behaviour is to map the request. | |
112 | */ | |
113 | if (dma->is_compatible) | |
114 | compatible = dma->is_compatible(musb_ep->dma, | |
115 | musb_ep->packet_sz, request->request.buf, | |
116 | request->request.length); | |
117 | if (!compatible) | |
118 | return; | |
119 | ||
92d2711f HK |
120 | if (request->request.dma == DMA_ADDR_INVALID) { |
121 | request->request.dma = dma_map_single( | |
122 | musb->controller, | |
123 | request->request.buf, | |
124 | request->request.length, | |
125 | request->tx | |
126 | ? DMA_TO_DEVICE | |
127 | : DMA_FROM_DEVICE); | |
c65bfa62 | 128 | request->map_state = MUSB_MAPPED; |
92d2711f HK |
129 | } else { |
130 | dma_sync_single_for_device(musb->controller, | |
131 | request->request.dma, | |
132 | request->request.length, | |
133 | request->tx | |
134 | ? DMA_TO_DEVICE | |
135 | : DMA_FROM_DEVICE); | |
c65bfa62 | 136 | request->map_state = PRE_MAPPED; |
92d2711f HK |
137 | } |
138 | } | |
139 | ||
140 | /* Unmap the buffer from dma and maps it back to cpu */ | |
141 | static inline void unmap_dma_buffer(struct musb_request *request, | |
142 | struct musb *musb) | |
143 | { | |
c65bfa62 MYK |
144 | if (!is_buffer_mapped(request)) |
145 | return; | |
146 | ||
92d2711f | 147 | if (request->request.dma == DMA_ADDR_INVALID) { |
5c8a86e1 FB |
148 | dev_vdbg(musb->controller, |
149 | "not unmapping a never mapped buffer\n"); | |
92d2711f HK |
150 | return; |
151 | } | |
c65bfa62 | 152 | if (request->map_state == MUSB_MAPPED) { |
92d2711f HK |
153 | dma_unmap_single(musb->controller, |
154 | request->request.dma, | |
155 | request->request.length, | |
156 | request->tx | |
157 | ? DMA_TO_DEVICE | |
158 | : DMA_FROM_DEVICE); | |
159 | request->request.dma = DMA_ADDR_INVALID; | |
c65bfa62 | 160 | } else { /* PRE_MAPPED */ |
92d2711f HK |
161 | dma_sync_single_for_cpu(musb->controller, |
162 | request->request.dma, | |
163 | request->request.length, | |
164 | request->tx | |
165 | ? DMA_TO_DEVICE | |
166 | : DMA_FROM_DEVICE); | |
92d2711f | 167 | } |
c65bfa62 | 168 | request->map_state = UN_MAPPED; |
92d2711f HK |
169 | } |
170 | ||
550a7375 FB |
171 | /* |
172 | * Immediately complete a request. | |
173 | * | |
174 | * @param request the request to complete | |
175 | * @param status the status to complete the request with | |
176 | * Context: controller locked, IRQs blocked. | |
177 | */ | |
178 | void musb_g_giveback( | |
179 | struct musb_ep *ep, | |
180 | struct usb_request *request, | |
181 | int status) | |
182 | __releases(ep->musb->lock) | |
183 | __acquires(ep->musb->lock) | |
184 | { | |
185 | struct musb_request *req; | |
186 | struct musb *musb; | |
187 | int busy = ep->busy; | |
188 | ||
189 | req = to_musb_request(request); | |
190 | ||
ad1adb89 | 191 | list_del(&req->list); |
550a7375 FB |
192 | if (req->request.status == -EINPROGRESS) |
193 | req->request.status = status; | |
194 | musb = req->musb; | |
195 | ||
196 | ep->busy = 1; | |
197 | spin_unlock(&musb->lock); | |
c65bfa62 | 198 | unmap_dma_buffer(req, musb); |
550a7375 | 199 | if (request->status == 0) |
5c8a86e1 | 200 | dev_dbg(musb->controller, "%s done request %p, %d/%d\n", |
550a7375 FB |
201 | ep->end_point.name, request, |
202 | req->request.actual, req->request.length); | |
203 | else | |
5c8a86e1 | 204 | dev_dbg(musb->controller, "%s request %p, %d/%d fault %d\n", |
550a7375 FB |
205 | ep->end_point.name, request, |
206 | req->request.actual, req->request.length, | |
207 | request->status); | |
208 | req->request.complete(&req->ep->end_point, &req->request); | |
209 | spin_lock(&musb->lock); | |
210 | ep->busy = busy; | |
211 | } | |
212 | ||
213 | /* ----------------------------------------------------------------------- */ | |
214 | ||
215 | /* | |
216 | * Abort requests queued to an endpoint using the status. Synchronous. | |
217 | * caller locked controller and blocked irqs, and selected this ep. | |
218 | */ | |
219 | static void nuke(struct musb_ep *ep, const int status) | |
220 | { | |
5c8a86e1 | 221 | struct musb *musb = ep->musb; |
550a7375 FB |
222 | struct musb_request *req = NULL; |
223 | void __iomem *epio = ep->musb->endpoints[ep->current_epnum].regs; | |
224 | ||
225 | ep->busy = 1; | |
226 | ||
227 | if (is_dma_capable() && ep->dma) { | |
228 | struct dma_controller *c = ep->musb->dma_controller; | |
229 | int value; | |
b6e434a5 | 230 | |
550a7375 | 231 | if (ep->is_in) { |
b6e434a5 SS |
232 | /* |
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... | |
236 | */ | |
550a7375 | 237 | musb_writew(epio, MUSB_TXCSR, |
b6e434a5 | 238 | MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO); |
550a7375 FB |
239 | musb_writew(epio, MUSB_TXCSR, |
240 | 0 | MUSB_TXCSR_FLUSHFIFO); | |
241 | } else { | |
242 | musb_writew(epio, MUSB_RXCSR, | |
243 | 0 | MUSB_RXCSR_FLUSHFIFO); | |
244 | musb_writew(epio, MUSB_RXCSR, | |
245 | 0 | MUSB_RXCSR_FLUSHFIFO); | |
246 | } | |
247 | ||
248 | value = c->channel_abort(ep->dma); | |
5c8a86e1 FB |
249 | dev_dbg(musb->controller, "%s: abort DMA --> %d\n", |
250 | ep->name, value); | |
550a7375 FB |
251 | c->channel_release(ep->dma); |
252 | ep->dma = NULL; | |
253 | } | |
254 | ||
ad1adb89 FB |
255 | while (!list_empty(&ep->req_list)) { |
256 | req = list_first_entry(&ep->req_list, struct musb_request, list); | |
550a7375 FB |
257 | musb_g_giveback(ep, &req->request, status); |
258 | } | |
259 | } | |
260 | ||
261 | /* ----------------------------------------------------------------------- */ | |
262 | ||
263 | /* Data transfers - pure PIO, pure DMA, or mixed mode */ | |
264 | ||
265 | /* | |
266 | * This assumes the separate CPPI engine is responding to DMA requests | |
267 | * from the usb core ... sequenced a bit differently from mentor dma. | |
268 | */ | |
269 | ||
270 | static inline int max_ep_writesize(struct musb *musb, struct musb_ep *ep) | |
271 | { | |
272 | if (can_bulk_split(musb, ep->type)) | |
273 | return ep->hw_ep->max_packet_sz_tx; | |
274 | else | |
275 | return ep->packet_sz; | |
276 | } | |
277 | ||
278 | ||
279 | #ifdef CONFIG_USB_INVENTRA_DMA | |
280 | ||
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, | |
284 | ||
285 | One of the following happens: | |
286 | - Host sends IN token which causes an endpoint interrupt | |
287 | -> TxAvail | |
288 | -> if DMA is currently busy, exit. | |
289 | -> if queue is non-empty, txstate(). | |
290 | ||
291 | - Request is queued by the gadget driver. | |
292 | -> if queue was previously empty, txstate() | |
293 | ||
294 | txstate() | |
295 | -> start | |
296 | /\ -> setup DMA | |
297 | | (data is transferred to the FIFO, then sent out when | |
298 | | IN token(s) are recd from Host. | |
299 | | -> DMA interrupt on completion | |
300 | | calls TxAvail. | |
b6e434a5 | 301 | | -> stop DMA, ~DMAENAB, |
550a7375 FB |
302 | | -> set TxPktRdy for last short pkt or zlp |
303 | | -> Complete Request | |
304 | | -> Continue next request (call txstate) | |
305 | |___________________________________| | |
306 | ||
307 | * Non-Mentor DMA engines can of course work differently, such as by | |
308 | * upleveling from irq-per-packet to irq-per-buffer. | |
309 | */ | |
310 | ||
311 | #endif | |
312 | ||
313 | /* | |
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 | |
316 | * endpoint. | |
317 | * | |
318 | * Context: controller locked, IRQs blocked, endpoint selected | |
319 | */ | |
320 | static void txstate(struct musb *musb, struct musb_request *req) | |
321 | { | |
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; | |
327 | int use_dma = 0; | |
328 | ||
329 | musb_ep = req->ep; | |
330 | ||
abf710e6 VP |
331 | /* Check if EP is disabled */ |
332 | if (!musb_ep->desc) { | |
333 | dev_dbg(musb->controller, "ep:%s disabled - ignore request\n", | |
334 | musb_ep->end_point.name); | |
335 | return; | |
336 | } | |
337 | ||
550a7375 FB |
338 | /* we shouldn't get here while DMA is active ... but we do ... */ |
339 | if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) { | |
5c8a86e1 | 340 | dev_dbg(musb->controller, "dma pending...\n"); |
550a7375 FB |
341 | return; |
342 | } | |
343 | ||
344 | /* read TXCSR before */ | |
345 | csr = musb_readw(epio, MUSB_TXCSR); | |
346 | ||
347 | request = &req->request; | |
348 | fifo_count = min(max_ep_writesize(musb, musb_ep), | |
349 | (int)(request->length - request->actual)); | |
350 | ||
351 | if (csr & MUSB_TXCSR_TXPKTRDY) { | |
5c8a86e1 | 352 | dev_dbg(musb->controller, "%s old packet still ready , txcsr %03x\n", |
550a7375 FB |
353 | musb_ep->end_point.name, csr); |
354 | return; | |
355 | } | |
356 | ||
357 | if (csr & MUSB_TXCSR_P_SENDSTALL) { | |
5c8a86e1 | 358 | dev_dbg(musb->controller, "%s stalling, txcsr %03x\n", |
550a7375 FB |
359 | musb_ep->end_point.name, csr); |
360 | return; | |
361 | } | |
362 | ||
5c8a86e1 | 363 | dev_dbg(musb->controller, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x\n", |
550a7375 FB |
364 | epnum, musb_ep->packet_sz, fifo_count, |
365 | csr); | |
366 | ||
367 | #ifndef CONFIG_MUSB_PIO_ONLY | |
c65bfa62 | 368 | if (is_buffer_mapped(req)) { |
550a7375 | 369 | struct dma_controller *c = musb->dma_controller; |
66af83dd ML |
370 | size_t request_size; |
371 | ||
372 | /* setup DMA, then program endpoint CSR */ | |
373 | request_size = min_t(size_t, request->length - request->actual, | |
374 | musb_ep->dma->max_len); | |
550a7375 | 375 | |
d17d535f | 376 | use_dma = (request->dma != DMA_ADDR_INVALID && request_size); |
550a7375 FB |
377 | |
378 | /* MUSB_TXCSR_P_ISO is still set correctly */ | |
379 | ||
a48ff906 | 380 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) |
550a7375 | 381 | { |
d1043a26 | 382 | if (request_size < musb_ep->packet_sz) |
550a7375 FB |
383 | musb_ep->dma->desired_mode = 0; |
384 | else | |
385 | musb_ep->dma->desired_mode = 1; | |
386 | ||
387 | use_dma = use_dma && c->channel_program( | |
388 | musb_ep->dma, musb_ep->packet_sz, | |
389 | musb_ep->dma->desired_mode, | |
796a83fa | 390 | request->dma + request->actual, request_size); |
550a7375 FB |
391 | if (use_dma) { |
392 | if (musb_ep->dma->desired_mode == 0) { | |
b6e434a5 SS |
393 | /* |
394 | * We must not clear the DMAMODE bit | |
395 | * before the DMAENAB bit -- and the | |
396 | * latter doesn't always get cleared | |
397 | * before we get here... | |
398 | */ | |
399 | csr &= ~(MUSB_TXCSR_AUTOSET | |
400 | | MUSB_TXCSR_DMAENAB); | |
401 | musb_writew(epio, MUSB_TXCSR, csr | |
402 | | MUSB_TXCSR_P_WZC_BITS); | |
403 | csr &= ~MUSB_TXCSR_DMAMODE; | |
550a7375 FB |
404 | csr |= (MUSB_TXCSR_DMAENAB | |
405 | MUSB_TXCSR_MODE); | |
406 | /* against programming guide */ | |
f11d893d ML |
407 | } else { |
408 | csr |= (MUSB_TXCSR_DMAENAB | |
550a7375 FB |
409 | | MUSB_TXCSR_DMAMODE |
410 | | MUSB_TXCSR_MODE); | |
f11d893d ML |
411 | if (!musb_ep->hb_mult) |
412 | csr |= MUSB_TXCSR_AUTOSET; | |
413 | } | |
550a7375 | 414 | csr &= ~MUSB_TXCSR_P_UNDERRUN; |
f11d893d | 415 | |
550a7375 FB |
416 | musb_writew(epio, MUSB_TXCSR, csr); |
417 | } | |
418 | } | |
419 | ||
420 | #elif defined(CONFIG_USB_TI_CPPI_DMA) | |
421 | /* program endpoint CSR first, then setup DMA */ | |
b6e434a5 | 422 | csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY); |
37e3ee99 SS |
423 | csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE | |
424 | MUSB_TXCSR_MODE; | |
550a7375 FB |
425 | musb_writew(epio, MUSB_TXCSR, |
426 | (MUSB_TXCSR_P_WZC_BITS & ~MUSB_TXCSR_P_UNDERRUN) | |
427 | | csr); | |
428 | ||
429 | /* ensure writebuffer is empty */ | |
430 | csr = musb_readw(epio, MUSB_TXCSR); | |
431 | ||
432 | /* NOTE host side sets DMAENAB later than this; both are | |
433 | * OK since the transfer dma glue (between CPPI and Mentor | |
434 | * fifos) just tells CPPI it could start. Data only moves | |
435 | * to the USB TX fifo when both fifos are ready. | |
436 | */ | |
437 | ||
438 | /* "mode" is irrelevant here; handle terminating ZLPs like | |
439 | * PIO does, since the hardware RNDIS mode seems unreliable | |
440 | * except for the last-packet-is-already-short case. | |
441 | */ | |
442 | use_dma = use_dma && c->channel_program( | |
443 | musb_ep->dma, musb_ep->packet_sz, | |
444 | 0, | |
66af83dd ML |
445 | request->dma + request->actual, |
446 | request_size); | |
550a7375 FB |
447 | if (!use_dma) { |
448 | c->channel_release(musb_ep->dma); | |
449 | musb_ep->dma = NULL; | |
b6e434a5 SS |
450 | csr &= ~MUSB_TXCSR_DMAENAB; |
451 | musb_writew(epio, MUSB_TXCSR, csr); | |
550a7375 FB |
452 | /* invariant: prequest->buf is non-null */ |
453 | } | |
454 | #elif defined(CONFIG_USB_TUSB_OMAP_DMA) | |
455 | use_dma = use_dma && c->channel_program( | |
456 | musb_ep->dma, musb_ep->packet_sz, | |
457 | request->zero, | |
66af83dd ML |
458 | request->dma + request->actual, |
459 | request_size); | |
550a7375 FB |
460 | #endif |
461 | } | |
462 | #endif | |
463 | ||
464 | if (!use_dma) { | |
92d2711f HK |
465 | /* |
466 | * Unmap the dma buffer back to cpu if dma channel | |
467 | * programming fails | |
468 | */ | |
c65bfa62 | 469 | unmap_dma_buffer(req, musb); |
92d2711f | 470 | |
550a7375 FB |
471 | musb_write_fifo(musb_ep->hw_ep, fifo_count, |
472 | (u8 *) (request->buf + request->actual)); | |
473 | request->actual += fifo_count; | |
474 | csr |= MUSB_TXCSR_TXPKTRDY; | |
475 | csr &= ~MUSB_TXCSR_P_UNDERRUN; | |
476 | musb_writew(epio, MUSB_TXCSR, csr); | |
477 | } | |
478 | ||
479 | /* host may already have the data when this message shows... */ | |
5c8a86e1 | 480 | dev_dbg(musb->controller, "%s TX/IN %s len %d/%d, txcsr %04x, fifo %d/%d\n", |
550a7375 FB |
481 | musb_ep->end_point.name, use_dma ? "dma" : "pio", |
482 | request->actual, request->length, | |
483 | musb_readw(epio, MUSB_TXCSR), | |
484 | fifo_count, | |
485 | musb_readw(epio, MUSB_TXMAXP)); | |
486 | } | |
487 | ||
488 | /* | |
489 | * FIFO state update (e.g. data ready). | |
490 | * Called from IRQ, with controller locked. | |
491 | */ | |
492 | void musb_g_tx(struct musb *musb, u8 epnum) | |
493 | { | |
494 | u16 csr; | |
ad1adb89 | 495 | struct musb_request *req; |
550a7375 FB |
496 | struct usb_request *request; |
497 | u8 __iomem *mbase = musb->mregs; | |
498 | struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_in; | |
499 | void __iomem *epio = musb->endpoints[epnum].regs; | |
500 | struct dma_channel *dma; | |
501 | ||
502 | musb_ep_select(mbase, epnum); | |
ad1adb89 FB |
503 | req = next_request(musb_ep); |
504 | request = &req->request; | |
550a7375 FB |
505 | |
506 | csr = musb_readw(epio, MUSB_TXCSR); | |
5c8a86e1 | 507 | dev_dbg(musb->controller, "<== %s, txcsr %04x\n", musb_ep->end_point.name, csr); |
550a7375 FB |
508 | |
509 | dma = is_dma_capable() ? musb_ep->dma : NULL; | |
7723de7e SS |
510 | |
511 | /* | |
512 | * REVISIT: for high bandwidth, MUSB_TXCSR_P_INCOMPTX | |
513 | * probably rates reporting as a host error. | |
514 | */ | |
515 | if (csr & MUSB_TXCSR_P_SENTSTALL) { | |
516 | csr |= MUSB_TXCSR_P_WZC_BITS; | |
517 | csr &= ~MUSB_TXCSR_P_SENTSTALL; | |
518 | musb_writew(epio, MUSB_TXCSR, csr); | |
519 | return; | |
520 | } | |
521 | ||
522 | if (csr & MUSB_TXCSR_P_UNDERRUN) { | |
523 | /* We NAKed, no big deal... little reason to care. */ | |
524 | csr |= MUSB_TXCSR_P_WZC_BITS; | |
525 | csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY); | |
526 | musb_writew(epio, MUSB_TXCSR, csr); | |
5c8a86e1 FB |
527 | dev_vdbg(musb->controller, "underrun on ep%d, req %p\n", |
528 | epnum, request); | |
7723de7e SS |
529 | } |
530 | ||
531 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
532 | /* | |
533 | * SHOULD NOT HAPPEN... has with CPPI though, after | |
534 | * changing SENDSTALL (and other cases); harmless? | |
550a7375 | 535 | */ |
5c8a86e1 | 536 | dev_dbg(musb->controller, "%s dma still busy?\n", musb_ep->end_point.name); |
7723de7e SS |
537 | return; |
538 | } | |
550a7375 | 539 | |
7723de7e SS |
540 | if (request) { |
541 | u8 is_dma = 0; | |
542 | ||
543 | if (dma && (csr & MUSB_TXCSR_DMAENAB)) { | |
544 | is_dma = 1; | |
550a7375 | 545 | csr |= MUSB_TXCSR_P_WZC_BITS; |
7723de7e | 546 | csr &= ~(MUSB_TXCSR_DMAENAB | MUSB_TXCSR_P_UNDERRUN | |
100d4a9d | 547 | MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_AUTOSET); |
550a7375 | 548 | musb_writew(epio, MUSB_TXCSR, csr); |
7723de7e SS |
549 | /* Ensure writebuffer is empty. */ |
550 | csr = musb_readw(epio, MUSB_TXCSR); | |
551 | request->actual += musb_ep->dma->actual_len; | |
5c8a86e1 | 552 | dev_dbg(musb->controller, "TXCSR%d %04x, DMA off, len %zu, req %p\n", |
7723de7e | 553 | epnum, csr, musb_ep->dma->actual_len, request); |
550a7375 FB |
554 | } |
555 | ||
e7379aaa ML |
556 | /* |
557 | * First, maybe a terminating short packet. Some DMA | |
558 | * engines might handle this by themselves. | |
559 | */ | |
560 | if ((request->zero && request->length | |
561 | && (request->length % musb_ep->packet_sz == 0) | |
562 | && (request->actual == request->length)) | |
a48ff906 | 563 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) |
e7379aaa ML |
564 | || (is_dma && (!dma->desired_mode || |
565 | (request->actual & | |
566 | (musb_ep->packet_sz - 1)))) | |
550a7375 | 567 | #endif |
e7379aaa ML |
568 | ) { |
569 | /* | |
570 | * On DMA completion, FIFO may not be | |
571 | * available yet... | |
572 | */ | |
573 | if (csr & MUSB_TXCSR_TXPKTRDY) | |
574 | return; | |
550a7375 | 575 | |
5c8a86e1 | 576 | dev_dbg(musb->controller, "sending zero pkt\n"); |
e7379aaa ML |
577 | musb_writew(epio, MUSB_TXCSR, MUSB_TXCSR_MODE |
578 | | MUSB_TXCSR_TXPKTRDY); | |
579 | request->zero = 0; | |
580 | } | |
581 | ||
582 | if (request->actual == request->length) { | |
583 | musb_g_giveback(musb_ep, request, 0); | |
39287076 SK |
584 | /* |
585 | * In the giveback function the MUSB lock is | |
586 | * released and acquired after sometime. During | |
587 | * this time period the INDEX register could get | |
588 | * changed by the gadget_queue function especially | |
589 | * on SMP systems. Reselect the INDEX to be sure | |
590 | * we are reading/modifying the right registers | |
591 | */ | |
592 | musb_ep_select(mbase, epnum); | |
ad1adb89 FB |
593 | req = musb_ep->desc ? next_request(musb_ep) : NULL; |
594 | if (!req) { | |
5c8a86e1 | 595 | dev_dbg(musb->controller, "%s idle now\n", |
e7379aaa ML |
596 | musb_ep->end_point.name); |
597 | return; | |
95962a77 | 598 | } |
550a7375 FB |
599 | } |
600 | ||
ad1adb89 | 601 | txstate(musb, req); |
7723de7e | 602 | } |
550a7375 FB |
603 | } |
604 | ||
605 | /* ------------------------------------------------------------ */ | |
606 | ||
607 | #ifdef CONFIG_USB_INVENTRA_DMA | |
608 | ||
609 | /* Peripheral rx (OUT) using Mentor DMA works as follows: | |
610 | - Only mode 0 is used. | |
611 | ||
612 | - Request is queued by the gadget class driver. | |
613 | -> if queue was previously empty, rxstate() | |
614 | ||
615 | - Host sends OUT token which causes an endpoint interrupt | |
616 | /\ -> RxReady | |
617 | | -> if request queued, call rxstate | |
618 | | /\ -> setup DMA | |
619 | | | -> DMA interrupt on completion | |
620 | | | -> RxReady | |
621 | | | -> stop DMA | |
622 | | | -> ack the read | |
623 | | | -> if data recd = max expected | |
624 | | | by the request, or host | |
625 | | | sent a short packet, | |
626 | | | complete the request, | |
627 | | | and start the next one. | |
628 | | |_____________________________________| | |
629 | | else just wait for the host | |
630 | | to send the next OUT token. | |
631 | |__________________________________________________| | |
632 | ||
633 | * Non-Mentor DMA engines can of course work differently. | |
634 | */ | |
635 | ||
636 | #endif | |
637 | ||
638 | /* | |
639 | * Context: controller locked, IRQs blocked, endpoint selected | |
640 | */ | |
641 | static void rxstate(struct musb *musb, struct musb_request *req) | |
642 | { | |
550a7375 FB |
643 | const u8 epnum = req->epnum; |
644 | struct usb_request *request = &req->request; | |
bd2e74d6 | 645 | struct musb_ep *musb_ep; |
550a7375 | 646 | void __iomem *epio = musb->endpoints[epnum].regs; |
f0443afd SS |
647 | unsigned len = 0; |
648 | u16 fifo_count; | |
cea83241 | 649 | u16 csr = musb_readw(epio, MUSB_RXCSR); |
bd2e74d6 | 650 | struct musb_hw_ep *hw_ep = &musb->endpoints[epnum]; |
0ae52d54 | 651 | u8 use_mode_1; |
bd2e74d6 ML |
652 | |
653 | if (hw_ep->is_shared_fifo) | |
654 | musb_ep = &hw_ep->ep_in; | |
655 | else | |
656 | musb_ep = &hw_ep->ep_out; | |
657 | ||
f0443afd | 658 | fifo_count = musb_ep->packet_sz; |
550a7375 | 659 | |
abf710e6 VP |
660 | /* Check if EP is disabled */ |
661 | if (!musb_ep->desc) { | |
662 | dev_dbg(musb->controller, "ep:%s disabled - ignore request\n", | |
663 | musb_ep->end_point.name); | |
664 | return; | |
665 | } | |
666 | ||
cea83241 SS |
667 | /* We shouldn't get here while DMA is active, but we do... */ |
668 | if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) { | |
5c8a86e1 | 669 | dev_dbg(musb->controller, "DMA pending...\n"); |
cea83241 SS |
670 | return; |
671 | } | |
672 | ||
673 | if (csr & MUSB_RXCSR_P_SENDSTALL) { | |
5c8a86e1 | 674 | dev_dbg(musb->controller, "%s stalling, RXCSR %04x\n", |
cea83241 SS |
675 | musb_ep->end_point.name, csr); |
676 | return; | |
677 | } | |
550a7375 | 678 | |
c65bfa62 | 679 | if (is_cppi_enabled() && is_buffer_mapped(req)) { |
550a7375 FB |
680 | struct dma_controller *c = musb->dma_controller; |
681 | struct dma_channel *channel = musb_ep->dma; | |
682 | ||
683 | /* NOTE: CPPI won't actually stop advancing the DMA | |
684 | * queue after short packet transfers, so this is almost | |
685 | * always going to run as IRQ-per-packet DMA so that | |
686 | * faults will be handled correctly. | |
687 | */ | |
688 | if (c->channel_program(channel, | |
689 | musb_ep->packet_sz, | |
690 | !request->short_not_ok, | |
691 | request->dma + request->actual, | |
692 | request->length - request->actual)) { | |
693 | ||
694 | /* make sure that if an rxpkt arrived after the irq, | |
695 | * the cppi engine will be ready to take it as soon | |
696 | * as DMA is enabled | |
697 | */ | |
698 | csr &= ~(MUSB_RXCSR_AUTOCLEAR | |
699 | | MUSB_RXCSR_DMAMODE); | |
700 | csr |= MUSB_RXCSR_DMAENAB | MUSB_RXCSR_P_WZC_BITS; | |
701 | musb_writew(epio, MUSB_RXCSR, csr); | |
702 | return; | |
703 | } | |
704 | } | |
705 | ||
706 | if (csr & MUSB_RXCSR_RXPKTRDY) { | |
f0443afd | 707 | fifo_count = musb_readw(epio, MUSB_RXCOUNT); |
0ae52d54 AG |
708 | |
709 | /* | |
4f3e8d26 RQ |
710 | * use mode 1 only if we expect data of at least ep packet_sz |
711 | * and have not yet received a short packet | |
0ae52d54 | 712 | */ |
4f3e8d26 RQ |
713 | if ((request->length - request->actual >= musb_ep->packet_sz) && |
714 | (fifo_count >= musb_ep->packet_sz)) | |
0ae52d54 AG |
715 | use_mode_1 = 1; |
716 | else | |
717 | use_mode_1 = 0; | |
718 | ||
550a7375 FB |
719 | if (request->actual < request->length) { |
720 | #ifdef CONFIG_USB_INVENTRA_DMA | |
c65bfa62 | 721 | if (is_buffer_mapped(req)) { |
550a7375 FB |
722 | struct dma_controller *c; |
723 | struct dma_channel *channel; | |
724 | int use_dma = 0; | |
660fa886 | 725 | int transfer_size; |
550a7375 FB |
726 | |
727 | c = musb->dma_controller; | |
728 | channel = musb_ep->dma; | |
729 | ||
0ae52d54 AG |
730 | /* Experimental: Mode1 works with mass storage use cases */ |
731 | if (use_mode_1) { | |
9001d80d | 732 | csr |= MUSB_RXCSR_AUTOCLEAR; |
0ae52d54 AG |
733 | musb_writew(epio, MUSB_RXCSR, csr); |
734 | csr |= MUSB_RXCSR_DMAENAB; | |
735 | musb_writew(epio, MUSB_RXCSR, csr); | |
736 | ||
737 | /* | |
738 | * this special sequence (enabling and then | |
739 | * disabling MUSB_RXCSR_DMAMODE) is required | |
740 | * to get DMAReq to activate | |
741 | */ | |
742 | musb_writew(epio, MUSB_RXCSR, | |
743 | csr | MUSB_RXCSR_DMAMODE); | |
744 | musb_writew(epio, MUSB_RXCSR, csr); | |
745 | ||
660fa886 RQ |
746 | transfer_size = min(request->length - request->actual, |
747 | channel->max_len); | |
748 | musb_ep->dma->desired_mode = 1; | |
749 | ||
0ae52d54 AG |
750 | } else { |
751 | if (!musb_ep->hb_mult && | |
752 | musb_ep->hw_ep->rx_double_buffered) | |
753 | csr |= MUSB_RXCSR_AUTOCLEAR; | |
754 | csr |= MUSB_RXCSR_DMAENAB; | |
755 | musb_writew(epio, MUSB_RXCSR, csr); | |
550a7375 | 756 | |
660fa886 | 757 | transfer_size = min(request->length - request->actual, |
f0443afd | 758 | (unsigned)fifo_count); |
660fa886 | 759 | musb_ep->dma->desired_mode = 0; |
550a7375 FB |
760 | } |
761 | ||
660fa886 RQ |
762 | use_dma = c->channel_program( |
763 | channel, | |
764 | musb_ep->packet_sz, | |
765 | channel->desired_mode, | |
766 | request->dma | |
767 | + request->actual, | |
768 | transfer_size); | |
769 | ||
550a7375 | 770 | if (use_dma) |
a48ff906 MYK |
771 | return; |
772 | } | |
773 | #elif defined(CONFIG_USB_UX500_DMA) | |
774 | if ((is_buffer_mapped(req)) && | |
775 | (request->actual < request->length)) { | |
776 | ||
777 | struct dma_controller *c; | |
778 | struct dma_channel *channel; | |
779 | int transfer_size = 0; | |
780 | ||
781 | c = musb->dma_controller; | |
782 | channel = musb_ep->dma; | |
783 | ||
784 | /* In case first packet is short */ | |
f0443afd SS |
785 | if (fifo_count < musb_ep->packet_sz) |
786 | transfer_size = fifo_count; | |
a48ff906 MYK |
787 | else if (request->short_not_ok) |
788 | transfer_size = min(request->length - | |
789 | request->actual, | |
790 | channel->max_len); | |
791 | else | |
792 | transfer_size = min(request->length - | |
793 | request->actual, | |
f0443afd | 794 | (unsigned)fifo_count); |
a48ff906 MYK |
795 | |
796 | csr &= ~MUSB_RXCSR_DMAMODE; | |
797 | csr |= (MUSB_RXCSR_DMAENAB | | |
798 | MUSB_RXCSR_AUTOCLEAR); | |
799 | ||
800 | musb_writew(epio, MUSB_RXCSR, csr); | |
801 | ||
802 | if (transfer_size <= musb_ep->packet_sz) { | |
803 | musb_ep->dma->desired_mode = 0; | |
804 | } else { | |
805 | musb_ep->dma->desired_mode = 1; | |
806 | /* Mode must be set after DMAENAB */ | |
807 | csr |= MUSB_RXCSR_DMAMODE; | |
808 | musb_writew(epio, MUSB_RXCSR, csr); | |
809 | } | |
810 | ||
811 | if (c->channel_program(channel, | |
812 | musb_ep->packet_sz, | |
813 | channel->desired_mode, | |
814 | request->dma | |
815 | + request->actual, | |
816 | transfer_size)) | |
817 | ||
550a7375 FB |
818 | return; |
819 | } | |
820 | #endif /* Mentor's DMA */ | |
821 | ||
f0443afd | 822 | len = request->length - request->actual; |
5c8a86e1 | 823 | dev_dbg(musb->controller, "%s OUT/RX pio fifo %d/%d, maxpacket %d\n", |
550a7375 | 824 | musb_ep->end_point.name, |
f0443afd | 825 | fifo_count, len, |
550a7375 FB |
826 | musb_ep->packet_sz); |
827 | ||
c2c96321 | 828 | fifo_count = min_t(unsigned, len, fifo_count); |
550a7375 FB |
829 | |
830 | #ifdef CONFIG_USB_TUSB_OMAP_DMA | |
c65bfa62 | 831 | if (tusb_dma_omap() && is_buffer_mapped(req)) { |
550a7375 FB |
832 | struct dma_controller *c = musb->dma_controller; |
833 | struct dma_channel *channel = musb_ep->dma; | |
834 | u32 dma_addr = request->dma + request->actual; | |
835 | int ret; | |
836 | ||
837 | ret = c->channel_program(channel, | |
838 | musb_ep->packet_sz, | |
839 | channel->desired_mode, | |
840 | dma_addr, | |
841 | fifo_count); | |
842 | if (ret) | |
843 | return; | |
844 | } | |
845 | #endif | |
92d2711f HK |
846 | /* |
847 | * Unmap the dma buffer back to cpu if dma channel | |
848 | * programming fails. This buffer is mapped if the | |
849 | * channel allocation is successful | |
850 | */ | |
c65bfa62 | 851 | if (is_buffer_mapped(req)) { |
92d2711f HK |
852 | unmap_dma_buffer(req, musb); |
853 | ||
e75df371 ML |
854 | /* |
855 | * Clear DMAENAB and AUTOCLEAR for the | |
92d2711f HK |
856 | * PIO mode transfer |
857 | */ | |
e75df371 | 858 | csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR); |
92d2711f HK |
859 | musb_writew(epio, MUSB_RXCSR, csr); |
860 | } | |
550a7375 FB |
861 | |
862 | musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *) | |
863 | (request->buf + request->actual)); | |
864 | request->actual += fifo_count; | |
865 | ||
866 | /* REVISIT if we left anything in the fifo, flush | |
867 | * it and report -EOVERFLOW | |
868 | */ | |
869 | ||
870 | /* ack the read! */ | |
871 | csr |= MUSB_RXCSR_P_WZC_BITS; | |
872 | csr &= ~MUSB_RXCSR_RXPKTRDY; | |
873 | musb_writew(epio, MUSB_RXCSR, csr); | |
874 | } | |
875 | } | |
876 | ||
877 | /* reach the end or short packet detected */ | |
f0443afd SS |
878 | if (request->actual == request->length || |
879 | fifo_count < musb_ep->packet_sz) | |
550a7375 FB |
880 | musb_g_giveback(musb_ep, request, 0); |
881 | } | |
882 | ||
883 | /* | |
884 | * Data ready for a request; called from IRQ | |
885 | */ | |
886 | void musb_g_rx(struct musb *musb, u8 epnum) | |
887 | { | |
888 | u16 csr; | |
ad1adb89 | 889 | struct musb_request *req; |
550a7375 FB |
890 | struct usb_request *request; |
891 | void __iomem *mbase = musb->mregs; | |
bd2e74d6 | 892 | struct musb_ep *musb_ep; |
550a7375 FB |
893 | void __iomem *epio = musb->endpoints[epnum].regs; |
894 | struct dma_channel *dma; | |
bd2e74d6 ML |
895 | struct musb_hw_ep *hw_ep = &musb->endpoints[epnum]; |
896 | ||
897 | if (hw_ep->is_shared_fifo) | |
898 | musb_ep = &hw_ep->ep_in; | |
899 | else | |
900 | musb_ep = &hw_ep->ep_out; | |
550a7375 FB |
901 | |
902 | musb_ep_select(mbase, epnum); | |
903 | ||
ad1adb89 FB |
904 | req = next_request(musb_ep); |
905 | if (!req) | |
0abdc36f | 906 | return; |
550a7375 | 907 | |
ad1adb89 FB |
908 | request = &req->request; |
909 | ||
550a7375 FB |
910 | csr = musb_readw(epio, MUSB_RXCSR); |
911 | dma = is_dma_capable() ? musb_ep->dma : NULL; | |
912 | ||
5c8a86e1 | 913 | dev_dbg(musb->controller, "<== %s, rxcsr %04x%s %p\n", musb_ep->end_point.name, |
550a7375 FB |
914 | csr, dma ? " (dma)" : "", request); |
915 | ||
916 | if (csr & MUSB_RXCSR_P_SENTSTALL) { | |
550a7375 FB |
917 | csr |= MUSB_RXCSR_P_WZC_BITS; |
918 | csr &= ~MUSB_RXCSR_P_SENTSTALL; | |
919 | musb_writew(epio, MUSB_RXCSR, csr); | |
cea83241 | 920 | return; |
550a7375 FB |
921 | } |
922 | ||
923 | if (csr & MUSB_RXCSR_P_OVERRUN) { | |
924 | /* csr |= MUSB_RXCSR_P_WZC_BITS; */ | |
925 | csr &= ~MUSB_RXCSR_P_OVERRUN; | |
926 | musb_writew(epio, MUSB_RXCSR, csr); | |
927 | ||
5c8a86e1 | 928 | dev_dbg(musb->controller, "%s iso overrun on %p\n", musb_ep->name, request); |
43467868 | 929 | if (request->status == -EINPROGRESS) |
550a7375 FB |
930 | request->status = -EOVERFLOW; |
931 | } | |
932 | if (csr & MUSB_RXCSR_INCOMPRX) { | |
933 | /* REVISIT not necessarily an error */ | |
5c8a86e1 | 934 | dev_dbg(musb->controller, "%s, incomprx\n", musb_ep->end_point.name); |
550a7375 FB |
935 | } |
936 | ||
937 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
938 | /* "should not happen"; likely RXPKTRDY pending for DMA */ | |
5c8a86e1 | 939 | dev_dbg(musb->controller, "%s busy, csr %04x\n", |
550a7375 | 940 | musb_ep->end_point.name, csr); |
cea83241 | 941 | return; |
550a7375 FB |
942 | } |
943 | ||
944 | if (dma && (csr & MUSB_RXCSR_DMAENAB)) { | |
945 | csr &= ~(MUSB_RXCSR_AUTOCLEAR | |
946 | | MUSB_RXCSR_DMAENAB | |
947 | | MUSB_RXCSR_DMAMODE); | |
948 | musb_writew(epio, MUSB_RXCSR, | |
949 | MUSB_RXCSR_P_WZC_BITS | csr); | |
950 | ||
951 | request->actual += musb_ep->dma->actual_len; | |
952 | ||
5c8a86e1 | 953 | dev_dbg(musb->controller, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n", |
550a7375 FB |
954 | epnum, csr, |
955 | musb_readw(epio, MUSB_RXCSR), | |
956 | musb_ep->dma->actual_len, request); | |
957 | ||
a48ff906 MYK |
958 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \ |
959 | defined(CONFIG_USB_UX500_DMA) | |
550a7375 | 960 | /* Autoclear doesn't clear RxPktRdy for short packets */ |
9001d80d | 961 | if ((dma->desired_mode == 0 && !hw_ep->rx_double_buffered) |
550a7375 FB |
962 | || (dma->actual_len |
963 | & (musb_ep->packet_sz - 1))) { | |
964 | /* ack the read! */ | |
965 | csr &= ~MUSB_RXCSR_RXPKTRDY; | |
966 | musb_writew(epio, MUSB_RXCSR, csr); | |
967 | } | |
968 | ||
969 | /* incomplete, and not short? wait for next IN packet */ | |
970 | if ((request->actual < request->length) | |
971 | && (musb_ep->dma->actual_len | |
9001d80d ML |
972 | == musb_ep->packet_sz)) { |
973 | /* In double buffer case, continue to unload fifo if | |
974 | * there is Rx packet in FIFO. | |
975 | **/ | |
976 | csr = musb_readw(epio, MUSB_RXCSR); | |
977 | if ((csr & MUSB_RXCSR_RXPKTRDY) && | |
978 | hw_ep->rx_double_buffered) | |
979 | goto exit; | |
cea83241 | 980 | return; |
9001d80d | 981 | } |
550a7375 FB |
982 | #endif |
983 | musb_g_giveback(musb_ep, request, 0); | |
39287076 SK |
984 | /* |
985 | * In the giveback function the MUSB lock is | |
986 | * released and acquired after sometime. During | |
987 | * this time period the INDEX register could get | |
988 | * changed by the gadget_queue function especially | |
989 | * on SMP systems. Reselect the INDEX to be sure | |
990 | * we are reading/modifying the right registers | |
991 | */ | |
992 | musb_ep_select(mbase, epnum); | |
550a7375 | 993 | |
ad1adb89 FB |
994 | req = next_request(musb_ep); |
995 | if (!req) | |
cea83241 | 996 | return; |
550a7375 | 997 | } |
a48ff906 MYK |
998 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) || \ |
999 | defined(CONFIG_USB_UX500_DMA) | |
9001d80d | 1000 | exit: |
bb324b08 | 1001 | #endif |
43467868 | 1002 | /* Analyze request */ |
ad1adb89 | 1003 | rxstate(musb, req); |
550a7375 FB |
1004 | } |
1005 | ||
1006 | /* ------------------------------------------------------------ */ | |
1007 | ||
1008 | static int musb_gadget_enable(struct usb_ep *ep, | |
1009 | const struct usb_endpoint_descriptor *desc) | |
1010 | { | |
1011 | unsigned long flags; | |
1012 | struct musb_ep *musb_ep; | |
1013 | struct musb_hw_ep *hw_ep; | |
1014 | void __iomem *regs; | |
1015 | struct musb *musb; | |
1016 | void __iomem *mbase; | |
1017 | u8 epnum; | |
1018 | u16 csr; | |
1019 | unsigned tmp; | |
1020 | int status = -EINVAL; | |
1021 | ||
1022 | if (!ep || !desc) | |
1023 | return -EINVAL; | |
1024 | ||
1025 | musb_ep = to_musb_ep(ep); | |
1026 | hw_ep = musb_ep->hw_ep; | |
1027 | regs = hw_ep->regs; | |
1028 | musb = musb_ep->musb; | |
1029 | mbase = musb->mregs; | |
1030 | epnum = musb_ep->current_epnum; | |
1031 | ||
1032 | spin_lock_irqsave(&musb->lock, flags); | |
1033 | ||
1034 | if (musb_ep->desc) { | |
1035 | status = -EBUSY; | |
1036 | goto fail; | |
1037 | } | |
96bcd090 | 1038 | musb_ep->type = usb_endpoint_type(desc); |
550a7375 FB |
1039 | |
1040 | /* check direction and (later) maxpacket size against endpoint */ | |
96bcd090 | 1041 | if (usb_endpoint_num(desc) != epnum) |
550a7375 FB |
1042 | goto fail; |
1043 | ||
1044 | /* REVISIT this rules out high bandwidth periodic transfers */ | |
29cc8897 | 1045 | tmp = usb_endpoint_maxp(desc); |
f11d893d ML |
1046 | if (tmp & ~0x07ff) { |
1047 | int ok; | |
1048 | ||
1049 | if (usb_endpoint_dir_in(desc)) | |
1050 | ok = musb->hb_iso_tx; | |
1051 | else | |
1052 | ok = musb->hb_iso_rx; | |
1053 | ||
1054 | if (!ok) { | |
5c8a86e1 | 1055 | dev_dbg(musb->controller, "no support for high bandwidth ISO\n"); |
f11d893d ML |
1056 | goto fail; |
1057 | } | |
1058 | musb_ep->hb_mult = (tmp >> 11) & 3; | |
1059 | } else { | |
1060 | musb_ep->hb_mult = 0; | |
1061 | } | |
1062 | ||
1063 | musb_ep->packet_sz = tmp & 0x7ff; | |
1064 | tmp = musb_ep->packet_sz * (musb_ep->hb_mult + 1); | |
550a7375 FB |
1065 | |
1066 | /* enable the interrupts for the endpoint, set the endpoint | |
1067 | * packet size (or fail), set the mode, clear the fifo | |
1068 | */ | |
1069 | musb_ep_select(mbase, epnum); | |
96bcd090 | 1070 | if (usb_endpoint_dir_in(desc)) { |
550a7375 FB |
1071 | u16 int_txe = musb_readw(mbase, MUSB_INTRTXE); |
1072 | ||
1073 | if (hw_ep->is_shared_fifo) | |
1074 | musb_ep->is_in = 1; | |
1075 | if (!musb_ep->is_in) | |
1076 | goto fail; | |
f11d893d ML |
1077 | |
1078 | if (tmp > hw_ep->max_packet_sz_tx) { | |
5c8a86e1 | 1079 | dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n"); |
550a7375 | 1080 | goto fail; |
f11d893d | 1081 | } |
550a7375 FB |
1082 | |
1083 | int_txe |= (1 << epnum); | |
1084 | musb_writew(mbase, MUSB_INTRTXE, int_txe); | |
1085 | ||
1086 | /* REVISIT if can_bulk_split(), use by updating "tmp"; | |
1087 | * likewise high bandwidth periodic tx | |
1088 | */ | |
9f445cb2 | 1089 | /* Set TXMAXP with the FIFO size of the endpoint |
31c9909b | 1090 | * to disable double buffering mode. |
9f445cb2 | 1091 | */ |
06624818 FB |
1092 | if (musb->double_buffer_not_ok) |
1093 | musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx); | |
1094 | else | |
1095 | musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz | |
1096 | | (musb_ep->hb_mult << 11)); | |
550a7375 FB |
1097 | |
1098 | csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG; | |
1099 | if (musb_readw(regs, MUSB_TXCSR) | |
1100 | & MUSB_TXCSR_FIFONOTEMPTY) | |
1101 | csr |= MUSB_TXCSR_FLUSHFIFO; | |
1102 | if (musb_ep->type == USB_ENDPOINT_XFER_ISOC) | |
1103 | csr |= MUSB_TXCSR_P_ISO; | |
1104 | ||
1105 | /* set twice in case of double buffering */ | |
1106 | musb_writew(regs, MUSB_TXCSR, csr); | |
1107 | /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */ | |
1108 | musb_writew(regs, MUSB_TXCSR, csr); | |
1109 | ||
1110 | } else { | |
1111 | u16 int_rxe = musb_readw(mbase, MUSB_INTRRXE); | |
1112 | ||
1113 | if (hw_ep->is_shared_fifo) | |
1114 | musb_ep->is_in = 0; | |
1115 | if (musb_ep->is_in) | |
1116 | goto fail; | |
f11d893d ML |
1117 | |
1118 | if (tmp > hw_ep->max_packet_sz_rx) { | |
5c8a86e1 | 1119 | dev_dbg(musb->controller, "packet size beyond hardware FIFO size\n"); |
550a7375 | 1120 | goto fail; |
f11d893d | 1121 | } |
550a7375 FB |
1122 | |
1123 | int_rxe |= (1 << epnum); | |
1124 | musb_writew(mbase, MUSB_INTRRXE, int_rxe); | |
1125 | ||
1126 | /* REVISIT if can_bulk_combine() use by updating "tmp" | |
1127 | * likewise high bandwidth periodic rx | |
1128 | */ | |
9f445cb2 CC |
1129 | /* Set RXMAXP with the FIFO size of the endpoint |
1130 | * to disable double buffering mode. | |
1131 | */ | |
06624818 FB |
1132 | if (musb->double_buffer_not_ok) |
1133 | musb_writew(regs, MUSB_RXMAXP, hw_ep->max_packet_sz_tx); | |
1134 | else | |
1135 | musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz | |
1136 | | (musb_ep->hb_mult << 11)); | |
550a7375 FB |
1137 | |
1138 | /* force shared fifo to OUT-only mode */ | |
1139 | if (hw_ep->is_shared_fifo) { | |
1140 | csr = musb_readw(regs, MUSB_TXCSR); | |
1141 | csr &= ~(MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY); | |
1142 | musb_writew(regs, MUSB_TXCSR, csr); | |
1143 | } | |
1144 | ||
1145 | csr = MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_CLRDATATOG; | |
1146 | if (musb_ep->type == USB_ENDPOINT_XFER_ISOC) | |
1147 | csr |= MUSB_RXCSR_P_ISO; | |
1148 | else if (musb_ep->type == USB_ENDPOINT_XFER_INT) | |
1149 | csr |= MUSB_RXCSR_DISNYET; | |
1150 | ||
1151 | /* set twice in case of double buffering */ | |
1152 | musb_writew(regs, MUSB_RXCSR, csr); | |
1153 | musb_writew(regs, MUSB_RXCSR, csr); | |
1154 | } | |
1155 | ||
1156 | /* NOTE: all the I/O code _should_ work fine without DMA, in case | |
1157 | * for some reason you run out of channels here. | |
1158 | */ | |
1159 | if (is_dma_capable() && musb->dma_controller) { | |
1160 | struct dma_controller *c = musb->dma_controller; | |
1161 | ||
1162 | musb_ep->dma = c->channel_alloc(c, hw_ep, | |
1163 | (desc->bEndpointAddress & USB_DIR_IN)); | |
1164 | } else | |
1165 | musb_ep->dma = NULL; | |
1166 | ||
1167 | musb_ep->desc = desc; | |
1168 | musb_ep->busy = 0; | |
47e97605 | 1169 | musb_ep->wedged = 0; |
550a7375 FB |
1170 | status = 0; |
1171 | ||
1172 | pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n", | |
1173 | musb_driver_name, musb_ep->end_point.name, | |
1174 | ({ char *s; switch (musb_ep->type) { | |
1175 | case USB_ENDPOINT_XFER_BULK: s = "bulk"; break; | |
1176 | case USB_ENDPOINT_XFER_INT: s = "int"; break; | |
1177 | default: s = "iso"; break; | |
1178 | }; s; }), | |
1179 | musb_ep->is_in ? "IN" : "OUT", | |
1180 | musb_ep->dma ? "dma, " : "", | |
1181 | musb_ep->packet_sz); | |
1182 | ||
1183 | schedule_work(&musb->irq_work); | |
1184 | ||
1185 | fail: | |
1186 | spin_unlock_irqrestore(&musb->lock, flags); | |
1187 | return status; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * Disable an endpoint flushing all requests queued. | |
1192 | */ | |
1193 | static int musb_gadget_disable(struct usb_ep *ep) | |
1194 | { | |
1195 | unsigned long flags; | |
1196 | struct musb *musb; | |
1197 | u8 epnum; | |
1198 | struct musb_ep *musb_ep; | |
1199 | void __iomem *epio; | |
1200 | int status = 0; | |
1201 | ||
1202 | musb_ep = to_musb_ep(ep); | |
1203 | musb = musb_ep->musb; | |
1204 | epnum = musb_ep->current_epnum; | |
1205 | epio = musb->endpoints[epnum].regs; | |
1206 | ||
1207 | spin_lock_irqsave(&musb->lock, flags); | |
1208 | musb_ep_select(musb->mregs, epnum); | |
1209 | ||
1210 | /* zero the endpoint sizes */ | |
1211 | if (musb_ep->is_in) { | |
1212 | u16 int_txe = musb_readw(musb->mregs, MUSB_INTRTXE); | |
1213 | int_txe &= ~(1 << epnum); | |
1214 | musb_writew(musb->mregs, MUSB_INTRTXE, int_txe); | |
1215 | musb_writew(epio, MUSB_TXMAXP, 0); | |
1216 | } else { | |
1217 | u16 int_rxe = musb_readw(musb->mregs, MUSB_INTRRXE); | |
1218 | int_rxe &= ~(1 << epnum); | |
1219 | musb_writew(musb->mregs, MUSB_INTRRXE, int_rxe); | |
1220 | musb_writew(epio, MUSB_RXMAXP, 0); | |
1221 | } | |
1222 | ||
1223 | musb_ep->desc = NULL; | |
08f75bf1 | 1224 | musb_ep->end_point.desc = NULL; |
550a7375 FB |
1225 | |
1226 | /* abort all pending DMA and requests */ | |
1227 | nuke(musb_ep, -ESHUTDOWN); | |
1228 | ||
1229 | schedule_work(&musb->irq_work); | |
1230 | ||
1231 | spin_unlock_irqrestore(&(musb->lock), flags); | |
1232 | ||
5c8a86e1 | 1233 | dev_dbg(musb->controller, "%s\n", musb_ep->end_point.name); |
550a7375 FB |
1234 | |
1235 | return status; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Allocate a request for an endpoint. | |
1240 | * Reused by ep0 code. | |
1241 | */ | |
1242 | struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) | |
1243 | { | |
1244 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
5c8a86e1 | 1245 | struct musb *musb = musb_ep->musb; |
550a7375 FB |
1246 | struct musb_request *request = NULL; |
1247 | ||
1248 | request = kzalloc(sizeof *request, gfp_flags); | |
0607f862 | 1249 | if (!request) { |
5c8a86e1 | 1250 | dev_dbg(musb->controller, "not enough memory\n"); |
0607f862 | 1251 | return NULL; |
550a7375 FB |
1252 | } |
1253 | ||
0607f862 FB |
1254 | request->request.dma = DMA_ADDR_INVALID; |
1255 | request->epnum = musb_ep->current_epnum; | |
1256 | request->ep = musb_ep; | |
1257 | ||
550a7375 FB |
1258 | return &request->request; |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Free a request | |
1263 | * Reused by ep0 code. | |
1264 | */ | |
1265 | void musb_free_request(struct usb_ep *ep, struct usb_request *req) | |
1266 | { | |
1267 | kfree(to_musb_request(req)); | |
1268 | } | |
1269 | ||
1270 | static LIST_HEAD(buffers); | |
1271 | ||
1272 | struct free_record { | |
1273 | struct list_head list; | |
1274 | struct device *dev; | |
1275 | unsigned bytes; | |
1276 | dma_addr_t dma; | |
1277 | }; | |
1278 | ||
1279 | /* | |
1280 | * Context: controller locked, IRQs blocked. | |
1281 | */ | |
a666e3e6 | 1282 | void musb_ep_restart(struct musb *musb, struct musb_request *req) |
550a7375 | 1283 | { |
5c8a86e1 | 1284 | dev_dbg(musb->controller, "<== %s request %p len %u on hw_ep%d\n", |
550a7375 FB |
1285 | req->tx ? "TX/IN" : "RX/OUT", |
1286 | &req->request, req->request.length, req->epnum); | |
1287 | ||
1288 | musb_ep_select(musb->mregs, req->epnum); | |
1289 | if (req->tx) | |
1290 | txstate(musb, req); | |
1291 | else | |
1292 | rxstate(musb, req); | |
1293 | } | |
1294 | ||
1295 | static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req, | |
1296 | gfp_t gfp_flags) | |
1297 | { | |
1298 | struct musb_ep *musb_ep; | |
1299 | struct musb_request *request; | |
1300 | struct musb *musb; | |
1301 | int status = 0; | |
1302 | unsigned long lockflags; | |
1303 | ||
1304 | if (!ep || !req) | |
1305 | return -EINVAL; | |
1306 | if (!req->buf) | |
1307 | return -ENODATA; | |
1308 | ||
1309 | musb_ep = to_musb_ep(ep); | |
1310 | musb = musb_ep->musb; | |
1311 | ||
1312 | request = to_musb_request(req); | |
1313 | request->musb = musb; | |
1314 | ||
1315 | if (request->ep != musb_ep) | |
1316 | return -EINVAL; | |
1317 | ||
5c8a86e1 | 1318 | dev_dbg(musb->controller, "<== to %s request=%p\n", ep->name, req); |
550a7375 FB |
1319 | |
1320 | /* request is mine now... */ | |
1321 | request->request.actual = 0; | |
1322 | request->request.status = -EINPROGRESS; | |
1323 | request->epnum = musb_ep->current_epnum; | |
1324 | request->tx = musb_ep->is_in; | |
1325 | ||
c65bfa62 | 1326 | map_dma_buffer(request, musb, musb_ep); |
550a7375 FB |
1327 | |
1328 | spin_lock_irqsave(&musb->lock, lockflags); | |
1329 | ||
1330 | /* don't queue if the ep is down */ | |
1331 | if (!musb_ep->desc) { | |
5c8a86e1 | 1332 | dev_dbg(musb->controller, "req %p queued to %s while ep %s\n", |
550a7375 FB |
1333 | req, ep->name, "disabled"); |
1334 | status = -ESHUTDOWN; | |
1335 | goto cleanup; | |
1336 | } | |
1337 | ||
1338 | /* add request to the list */ | |
ad1adb89 | 1339 | list_add_tail(&request->list, &musb_ep->req_list); |
550a7375 FB |
1340 | |
1341 | /* it this is the head of the queue, start i/o ... */ | |
ad1adb89 | 1342 | if (!musb_ep->busy && &request->list == musb_ep->req_list.next) |
550a7375 FB |
1343 | musb_ep_restart(musb, request); |
1344 | ||
1345 | cleanup: | |
1346 | spin_unlock_irqrestore(&musb->lock, lockflags); | |
1347 | return status; | |
1348 | } | |
1349 | ||
1350 | static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request) | |
1351 | { | |
1352 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
4cbbf084 FB |
1353 | struct musb_request *req = to_musb_request(request); |
1354 | struct musb_request *r; | |
550a7375 FB |
1355 | unsigned long flags; |
1356 | int status = 0; | |
1357 | struct musb *musb = musb_ep->musb; | |
1358 | ||
1359 | if (!ep || !request || to_musb_request(request)->ep != musb_ep) | |
1360 | return -EINVAL; | |
1361 | ||
1362 | spin_lock_irqsave(&musb->lock, flags); | |
1363 | ||
1364 | list_for_each_entry(r, &musb_ep->req_list, list) { | |
4cbbf084 | 1365 | if (r == req) |
550a7375 FB |
1366 | break; |
1367 | } | |
4cbbf084 | 1368 | if (r != req) { |
5c8a86e1 | 1369 | dev_dbg(musb->controller, "request %p not queued to %s\n", request, ep->name); |
550a7375 FB |
1370 | status = -EINVAL; |
1371 | goto done; | |
1372 | } | |
1373 | ||
1374 | /* if the hardware doesn't have the request, easy ... */ | |
3d5ad13e | 1375 | if (musb_ep->req_list.next != &req->list || musb_ep->busy) |
550a7375 FB |
1376 | musb_g_giveback(musb_ep, request, -ECONNRESET); |
1377 | ||
1378 | /* ... else abort the dma transfer ... */ | |
1379 | else if (is_dma_capable() && musb_ep->dma) { | |
1380 | struct dma_controller *c = musb->dma_controller; | |
1381 | ||
1382 | musb_ep_select(musb->mregs, musb_ep->current_epnum); | |
1383 | if (c->channel_abort) | |
1384 | status = c->channel_abort(musb_ep->dma); | |
1385 | else | |
1386 | status = -EBUSY; | |
1387 | if (status == 0) | |
1388 | musb_g_giveback(musb_ep, request, -ECONNRESET); | |
1389 | } else { | |
1390 | /* NOTE: by sticking to easily tested hardware/driver states, | |
1391 | * we leave counting of in-flight packets imprecise. | |
1392 | */ | |
1393 | musb_g_giveback(musb_ep, request, -ECONNRESET); | |
1394 | } | |
1395 | ||
1396 | done: | |
1397 | spin_unlock_irqrestore(&musb->lock, flags); | |
1398 | return status; | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * Set or clear the halt bit of an endpoint. A halted enpoint won't tx/rx any | |
1403 | * data but will queue requests. | |
1404 | * | |
1405 | * exported to ep0 code | |
1406 | */ | |
1b6c3b0f | 1407 | static int musb_gadget_set_halt(struct usb_ep *ep, int value) |
550a7375 FB |
1408 | { |
1409 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
1410 | u8 epnum = musb_ep->current_epnum; | |
1411 | struct musb *musb = musb_ep->musb; | |
1412 | void __iomem *epio = musb->endpoints[epnum].regs; | |
1413 | void __iomem *mbase; | |
1414 | unsigned long flags; | |
1415 | u16 csr; | |
cea83241 | 1416 | struct musb_request *request; |
550a7375 FB |
1417 | int status = 0; |
1418 | ||
1419 | if (!ep) | |
1420 | return -EINVAL; | |
1421 | mbase = musb->mregs; | |
1422 | ||
1423 | spin_lock_irqsave(&musb->lock, flags); | |
1424 | ||
1425 | if ((USB_ENDPOINT_XFER_ISOC == musb_ep->type)) { | |
1426 | status = -EINVAL; | |
1427 | goto done; | |
1428 | } | |
1429 | ||
1430 | musb_ep_select(mbase, epnum); | |
1431 | ||
ad1adb89 | 1432 | request = next_request(musb_ep); |
cea83241 SS |
1433 | if (value) { |
1434 | if (request) { | |
5c8a86e1 | 1435 | dev_dbg(musb->controller, "request in progress, cannot halt %s\n", |
cea83241 SS |
1436 | ep->name); |
1437 | status = -EAGAIN; | |
1438 | goto done; | |
1439 | } | |
1440 | /* Cannot portably stall with non-empty FIFO */ | |
1441 | if (musb_ep->is_in) { | |
1442 | csr = musb_readw(epio, MUSB_TXCSR); | |
1443 | if (csr & MUSB_TXCSR_FIFONOTEMPTY) { | |
5c8a86e1 | 1444 | dev_dbg(musb->controller, "FIFO busy, cannot halt %s\n", ep->name); |
cea83241 SS |
1445 | status = -EAGAIN; |
1446 | goto done; | |
1447 | } | |
550a7375 | 1448 | } |
47e97605 SS |
1449 | } else |
1450 | musb_ep->wedged = 0; | |
550a7375 FB |
1451 | |
1452 | /* set/clear the stall and toggle bits */ | |
5c8a86e1 | 1453 | dev_dbg(musb->controller, "%s: %s stall\n", ep->name, value ? "set" : "clear"); |
550a7375 FB |
1454 | if (musb_ep->is_in) { |
1455 | csr = musb_readw(epio, MUSB_TXCSR); | |
550a7375 FB |
1456 | csr |= MUSB_TXCSR_P_WZC_BITS |
1457 | | MUSB_TXCSR_CLRDATATOG; | |
1458 | if (value) | |
1459 | csr |= MUSB_TXCSR_P_SENDSTALL; | |
1460 | else | |
1461 | csr &= ~(MUSB_TXCSR_P_SENDSTALL | |
1462 | | MUSB_TXCSR_P_SENTSTALL); | |
1463 | csr &= ~MUSB_TXCSR_TXPKTRDY; | |
1464 | musb_writew(epio, MUSB_TXCSR, csr); | |
1465 | } else { | |
1466 | csr = musb_readw(epio, MUSB_RXCSR); | |
1467 | csr |= MUSB_RXCSR_P_WZC_BITS | |
1468 | | MUSB_RXCSR_FLUSHFIFO | |
1469 | | MUSB_RXCSR_CLRDATATOG; | |
1470 | if (value) | |
1471 | csr |= MUSB_RXCSR_P_SENDSTALL; | |
1472 | else | |
1473 | csr &= ~(MUSB_RXCSR_P_SENDSTALL | |
1474 | | MUSB_RXCSR_P_SENTSTALL); | |
1475 | musb_writew(epio, MUSB_RXCSR, csr); | |
1476 | } | |
1477 | ||
550a7375 FB |
1478 | /* maybe start the first request in the queue */ |
1479 | if (!musb_ep->busy && !value && request) { | |
5c8a86e1 | 1480 | dev_dbg(musb->controller, "restarting the request\n"); |
550a7375 FB |
1481 | musb_ep_restart(musb, request); |
1482 | } | |
1483 | ||
cea83241 | 1484 | done: |
550a7375 FB |
1485 | spin_unlock_irqrestore(&musb->lock, flags); |
1486 | return status; | |
1487 | } | |
1488 | ||
47e97605 SS |
1489 | /* |
1490 | * Sets the halt feature with the clear requests ignored | |
1491 | */ | |
1b6c3b0f | 1492 | static int musb_gadget_set_wedge(struct usb_ep *ep) |
47e97605 SS |
1493 | { |
1494 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
1495 | ||
1496 | if (!ep) | |
1497 | return -EINVAL; | |
1498 | ||
1499 | musb_ep->wedged = 1; | |
1500 | ||
1501 | return usb_ep_set_halt(ep); | |
1502 | } | |
1503 | ||
550a7375 FB |
1504 | static int musb_gadget_fifo_status(struct usb_ep *ep) |
1505 | { | |
1506 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
1507 | void __iomem *epio = musb_ep->hw_ep->regs; | |
1508 | int retval = -EINVAL; | |
1509 | ||
1510 | if (musb_ep->desc && !musb_ep->is_in) { | |
1511 | struct musb *musb = musb_ep->musb; | |
1512 | int epnum = musb_ep->current_epnum; | |
1513 | void __iomem *mbase = musb->mregs; | |
1514 | unsigned long flags; | |
1515 | ||
1516 | spin_lock_irqsave(&musb->lock, flags); | |
1517 | ||
1518 | musb_ep_select(mbase, epnum); | |
1519 | /* FIXME return zero unless RXPKTRDY is set */ | |
1520 | retval = musb_readw(epio, MUSB_RXCOUNT); | |
1521 | ||
1522 | spin_unlock_irqrestore(&musb->lock, flags); | |
1523 | } | |
1524 | return retval; | |
1525 | } | |
1526 | ||
1527 | static void musb_gadget_fifo_flush(struct usb_ep *ep) | |
1528 | { | |
1529 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
1530 | struct musb *musb = musb_ep->musb; | |
1531 | u8 epnum = musb_ep->current_epnum; | |
1532 | void __iomem *epio = musb->endpoints[epnum].regs; | |
1533 | void __iomem *mbase; | |
1534 | unsigned long flags; | |
1535 | u16 csr, int_txe; | |
1536 | ||
1537 | mbase = musb->mregs; | |
1538 | ||
1539 | spin_lock_irqsave(&musb->lock, flags); | |
1540 | musb_ep_select(mbase, (u8) epnum); | |
1541 | ||
1542 | /* disable interrupts */ | |
1543 | int_txe = musb_readw(mbase, MUSB_INTRTXE); | |
1544 | musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum)); | |
1545 | ||
1546 | if (musb_ep->is_in) { | |
1547 | csr = musb_readw(epio, MUSB_TXCSR); | |
1548 | if (csr & MUSB_TXCSR_FIFONOTEMPTY) { | |
1549 | csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_P_WZC_BITS; | |
4858f06e YK |
1550 | /* |
1551 | * Setting both TXPKTRDY and FLUSHFIFO makes controller | |
1552 | * to interrupt current FIFO loading, but not flushing | |
1553 | * the already loaded ones. | |
1554 | */ | |
1555 | csr &= ~MUSB_TXCSR_TXPKTRDY; | |
550a7375 FB |
1556 | musb_writew(epio, MUSB_TXCSR, csr); |
1557 | /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */ | |
1558 | musb_writew(epio, MUSB_TXCSR, csr); | |
1559 | } | |
1560 | } else { | |
1561 | csr = musb_readw(epio, MUSB_RXCSR); | |
1562 | csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_P_WZC_BITS; | |
1563 | musb_writew(epio, MUSB_RXCSR, csr); | |
1564 | musb_writew(epio, MUSB_RXCSR, csr); | |
1565 | } | |
1566 | ||
1567 | /* re-enable interrupt */ | |
1568 | musb_writew(mbase, MUSB_INTRTXE, int_txe); | |
1569 | spin_unlock_irqrestore(&musb->lock, flags); | |
1570 | } | |
1571 | ||
1572 | static const struct usb_ep_ops musb_ep_ops = { | |
1573 | .enable = musb_gadget_enable, | |
1574 | .disable = musb_gadget_disable, | |
1575 | .alloc_request = musb_alloc_request, | |
1576 | .free_request = musb_free_request, | |
1577 | .queue = musb_gadget_queue, | |
1578 | .dequeue = musb_gadget_dequeue, | |
1579 | .set_halt = musb_gadget_set_halt, | |
47e97605 | 1580 | .set_wedge = musb_gadget_set_wedge, |
550a7375 FB |
1581 | .fifo_status = musb_gadget_fifo_status, |
1582 | .fifo_flush = musb_gadget_fifo_flush | |
1583 | }; | |
1584 | ||
1585 | /* ----------------------------------------------------------------------- */ | |
1586 | ||
1587 | static int musb_gadget_get_frame(struct usb_gadget *gadget) | |
1588 | { | |
1589 | struct musb *musb = gadget_to_musb(gadget); | |
1590 | ||
1591 | return (int)musb_readw(musb->mregs, MUSB_FRAME); | |
1592 | } | |
1593 | ||
1594 | static int musb_gadget_wakeup(struct usb_gadget *gadget) | |
1595 | { | |
1596 | struct musb *musb = gadget_to_musb(gadget); | |
1597 | void __iomem *mregs = musb->mregs; | |
1598 | unsigned long flags; | |
1599 | int status = -EINVAL; | |
1600 | u8 power, devctl; | |
1601 | int retries; | |
1602 | ||
1603 | spin_lock_irqsave(&musb->lock, flags); | |
1604 | ||
84e250ff | 1605 | switch (musb->xceiv->state) { |
550a7375 FB |
1606 | case OTG_STATE_B_PERIPHERAL: |
1607 | /* NOTE: OTG state machine doesn't include B_SUSPENDED; | |
1608 | * that's part of the standard usb 1.1 state machine, and | |
1609 | * doesn't affect OTG transitions. | |
1610 | */ | |
1611 | if (musb->may_wakeup && musb->is_suspended) | |
1612 | break; | |
1613 | goto done; | |
1614 | case OTG_STATE_B_IDLE: | |
1615 | /* Start SRP ... OTG not required. */ | |
1616 | devctl = musb_readb(mregs, MUSB_DEVCTL); | |
5c8a86e1 | 1617 | dev_dbg(musb->controller, "Sending SRP: devctl: %02x\n", devctl); |
550a7375 FB |
1618 | devctl |= MUSB_DEVCTL_SESSION; |
1619 | musb_writeb(mregs, MUSB_DEVCTL, devctl); | |
1620 | devctl = musb_readb(mregs, MUSB_DEVCTL); | |
1621 | retries = 100; | |
1622 | while (!(devctl & MUSB_DEVCTL_SESSION)) { | |
1623 | devctl = musb_readb(mregs, MUSB_DEVCTL); | |
1624 | if (retries-- < 1) | |
1625 | break; | |
1626 | } | |
1627 | retries = 10000; | |
1628 | while (devctl & MUSB_DEVCTL_SESSION) { | |
1629 | devctl = musb_readb(mregs, MUSB_DEVCTL); | |
1630 | if (retries-- < 1) | |
1631 | break; | |
1632 | } | |
1633 | ||
8620543e | 1634 | spin_unlock_irqrestore(&musb->lock, flags); |
6e13c650 | 1635 | otg_start_srp(musb->xceiv->otg); |
8620543e HH |
1636 | spin_lock_irqsave(&musb->lock, flags); |
1637 | ||
550a7375 FB |
1638 | /* Block idling for at least 1s */ |
1639 | musb_platform_try_idle(musb, | |
1640 | jiffies + msecs_to_jiffies(1 * HZ)); | |
1641 | ||
1642 | status = 0; | |
1643 | goto done; | |
1644 | default: | |
5c8a86e1 | 1645 | dev_dbg(musb->controller, "Unhandled wake: %s\n", |
3df00453 | 1646 | otg_state_string(musb->xceiv->state)); |
550a7375 FB |
1647 | goto done; |
1648 | } | |
1649 | ||
1650 | status = 0; | |
1651 | ||
1652 | power = musb_readb(mregs, MUSB_POWER); | |
1653 | power |= MUSB_POWER_RESUME; | |
1654 | musb_writeb(mregs, MUSB_POWER, power); | |
5c8a86e1 | 1655 | dev_dbg(musb->controller, "issue wakeup\n"); |
550a7375 FB |
1656 | |
1657 | /* FIXME do this next chunk in a timer callback, no udelay */ | |
1658 | mdelay(2); | |
1659 | ||
1660 | power = musb_readb(mregs, MUSB_POWER); | |
1661 | power &= ~MUSB_POWER_RESUME; | |
1662 | musb_writeb(mregs, MUSB_POWER, power); | |
1663 | done: | |
1664 | spin_unlock_irqrestore(&musb->lock, flags); | |
1665 | return status; | |
1666 | } | |
1667 | ||
1668 | static int | |
1669 | musb_gadget_set_self_powered(struct usb_gadget *gadget, int is_selfpowered) | |
1670 | { | |
1671 | struct musb *musb = gadget_to_musb(gadget); | |
1672 | ||
1673 | musb->is_self_powered = !!is_selfpowered; | |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | static void musb_pullup(struct musb *musb, int is_on) | |
1678 | { | |
1679 | u8 power; | |
1680 | ||
1681 | power = musb_readb(musb->mregs, MUSB_POWER); | |
1682 | if (is_on) | |
1683 | power |= MUSB_POWER_SOFTCONN; | |
1684 | else | |
1685 | power &= ~MUSB_POWER_SOFTCONN; | |
1686 | ||
1687 | /* FIXME if on, HdrcStart; if off, HdrcStop */ | |
1688 | ||
e71eb392 SAS |
1689 | dev_dbg(musb->controller, "gadget D+ pullup %s\n", |
1690 | is_on ? "on" : "off"); | |
550a7375 FB |
1691 | musb_writeb(musb->mregs, MUSB_POWER, power); |
1692 | } | |
1693 | ||
1694 | #if 0 | |
1695 | static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active) | |
1696 | { | |
5c8a86e1 | 1697 | dev_dbg(musb->controller, "<= %s =>\n", __func__); |
550a7375 FB |
1698 | |
1699 | /* | |
1700 | * FIXME iff driver's softconnect flag is set (as it is during probe, | |
1701 | * though that can clear it), just musb_pullup(). | |
1702 | */ | |
1703 | ||
1704 | return -EINVAL; | |
1705 | } | |
1706 | #endif | |
1707 | ||
1708 | static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA) | |
1709 | { | |
1710 | struct musb *musb = gadget_to_musb(gadget); | |
1711 | ||
84e250ff | 1712 | if (!musb->xceiv->set_power) |
550a7375 | 1713 | return -EOPNOTSUPP; |
b96d3b08 | 1714 | return usb_phy_set_power(musb->xceiv, mA); |
550a7375 FB |
1715 | } |
1716 | ||
1717 | static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on) | |
1718 | { | |
1719 | struct musb *musb = gadget_to_musb(gadget); | |
1720 | unsigned long flags; | |
1721 | ||
1722 | is_on = !!is_on; | |
1723 | ||
93e098a8 JS |
1724 | pm_runtime_get_sync(musb->controller); |
1725 | ||
550a7375 FB |
1726 | /* NOTE: this assumes we are sensing vbus; we'd rather |
1727 | * not pullup unless the B-session is active. | |
1728 | */ | |
1729 | spin_lock_irqsave(&musb->lock, flags); | |
1730 | if (is_on != musb->softconnect) { | |
1731 | musb->softconnect = is_on; | |
1732 | musb_pullup(musb, is_on); | |
1733 | } | |
1734 | spin_unlock_irqrestore(&musb->lock, flags); | |
93e098a8 JS |
1735 | |
1736 | pm_runtime_put(musb->controller); | |
1737 | ||
550a7375 FB |
1738 | return 0; |
1739 | } | |
1740 | ||
e71eb392 SAS |
1741 | static int musb_gadget_start(struct usb_gadget *g, |
1742 | struct usb_gadget_driver *driver); | |
1743 | static int musb_gadget_stop(struct usb_gadget *g, | |
1744 | struct usb_gadget_driver *driver); | |
0f91349b | 1745 | |
550a7375 FB |
1746 | static const struct usb_gadget_ops musb_gadget_operations = { |
1747 | .get_frame = musb_gadget_get_frame, | |
1748 | .wakeup = musb_gadget_wakeup, | |
1749 | .set_selfpowered = musb_gadget_set_self_powered, | |
1750 | /* .vbus_session = musb_gadget_vbus_session, */ | |
1751 | .vbus_draw = musb_gadget_vbus_draw, | |
1752 | .pullup = musb_gadget_pullup, | |
e71eb392 SAS |
1753 | .udc_start = musb_gadget_start, |
1754 | .udc_stop = musb_gadget_stop, | |
550a7375 FB |
1755 | }; |
1756 | ||
1757 | /* ----------------------------------------------------------------------- */ | |
1758 | ||
1759 | /* Registration */ | |
1760 | ||
1761 | /* Only this registration code "knows" the rule (from USB standards) | |
1762 | * about there being only one external upstream port. It assumes | |
1763 | * all peripheral ports are external... | |
1764 | */ | |
550a7375 FB |
1765 | |
1766 | static void musb_gadget_release(struct device *dev) | |
1767 | { | |
1768 | /* kref_put(WHAT) */ | |
1769 | dev_dbg(dev, "%s\n", __func__); | |
1770 | } | |
1771 | ||
1772 | ||
e9e8c85e | 1773 | static void __devinit |
550a7375 FB |
1774 | init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in) |
1775 | { | |
1776 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
1777 | ||
1778 | memset(ep, 0, sizeof *ep); | |
1779 | ||
1780 | ep->current_epnum = epnum; | |
1781 | ep->musb = musb; | |
1782 | ep->hw_ep = hw_ep; | |
1783 | ep->is_in = is_in; | |
1784 | ||
1785 | INIT_LIST_HEAD(&ep->req_list); | |
1786 | ||
1787 | sprintf(ep->name, "ep%d%s", epnum, | |
1788 | (!epnum || hw_ep->is_shared_fifo) ? "" : ( | |
1789 | is_in ? "in" : "out")); | |
1790 | ep->end_point.name = ep->name; | |
1791 | INIT_LIST_HEAD(&ep->end_point.ep_list); | |
1792 | if (!epnum) { | |
1793 | ep->end_point.maxpacket = 64; | |
1794 | ep->end_point.ops = &musb_g_ep0_ops; | |
1795 | musb->g.ep0 = &ep->end_point; | |
1796 | } else { | |
1797 | if (is_in) | |
1798 | ep->end_point.maxpacket = hw_ep->max_packet_sz_tx; | |
1799 | else | |
1800 | ep->end_point.maxpacket = hw_ep->max_packet_sz_rx; | |
1801 | ep->end_point.ops = &musb_ep_ops; | |
1802 | list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list); | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | /* | |
1807 | * Initialize the endpoints exposed to peripheral drivers, with backlinks | |
1808 | * to the rest of the driver state. | |
1809 | */ | |
e9e8c85e | 1810 | static inline void __devinit musb_g_init_endpoints(struct musb *musb) |
550a7375 FB |
1811 | { |
1812 | u8 epnum; | |
1813 | struct musb_hw_ep *hw_ep; | |
1814 | unsigned count = 0; | |
1815 | ||
b595076a | 1816 | /* initialize endpoint list just once */ |
550a7375 FB |
1817 | INIT_LIST_HEAD(&(musb->g.ep_list)); |
1818 | ||
1819 | for (epnum = 0, hw_ep = musb->endpoints; | |
1820 | epnum < musb->nr_endpoints; | |
1821 | epnum++, hw_ep++) { | |
1822 | if (hw_ep->is_shared_fifo /* || !epnum */) { | |
1823 | init_peripheral_ep(musb, &hw_ep->ep_in, epnum, 0); | |
1824 | count++; | |
1825 | } else { | |
1826 | if (hw_ep->max_packet_sz_tx) { | |
1827 | init_peripheral_ep(musb, &hw_ep->ep_in, | |
1828 | epnum, 1); | |
1829 | count++; | |
1830 | } | |
1831 | if (hw_ep->max_packet_sz_rx) { | |
1832 | init_peripheral_ep(musb, &hw_ep->ep_out, | |
1833 | epnum, 0); | |
1834 | count++; | |
1835 | } | |
1836 | } | |
1837 | } | |
1838 | } | |
1839 | ||
1840 | /* called once during driver setup to initialize and link into | |
1841 | * the driver model; memory is zeroed. | |
1842 | */ | |
e9e8c85e | 1843 | int __devinit musb_gadget_setup(struct musb *musb) |
550a7375 FB |
1844 | { |
1845 | int status; | |
1846 | ||
1847 | /* REVISIT minor race: if (erroneously) setting up two | |
1848 | * musb peripherals at the same time, only the bus lock | |
1849 | * is probably held. | |
1850 | */ | |
550a7375 FB |
1851 | |
1852 | musb->g.ops = &musb_gadget_operations; | |
d327ab5b | 1853 | musb->g.max_speed = USB_SPEED_HIGH; |
550a7375 FB |
1854 | musb->g.speed = USB_SPEED_UNKNOWN; |
1855 | ||
1856 | /* this "gadget" abstracts/virtualizes the controller */ | |
427c4f33 | 1857 | dev_set_name(&musb->g.dev, "gadget"); |
550a7375 FB |
1858 | musb->g.dev.parent = musb->controller; |
1859 | musb->g.dev.dma_mask = musb->controller->dma_mask; | |
1860 | musb->g.dev.release = musb_gadget_release; | |
1861 | musb->g.name = musb_driver_name; | |
1862 | ||
032ec49f | 1863 | musb->g.is_otg = 1; |
550a7375 FB |
1864 | |
1865 | musb_g_init_endpoints(musb); | |
1866 | ||
1867 | musb->is_active = 0; | |
1868 | musb_platform_try_idle(musb, 0); | |
1869 | ||
1870 | status = device_register(&musb->g.dev); | |
e2c34045 RR |
1871 | if (status != 0) { |
1872 | put_device(&musb->g.dev); | |
0f91349b | 1873 | return status; |
e2c34045 | 1874 | } |
0f91349b SAS |
1875 | status = usb_add_gadget_udc(musb->controller, &musb->g); |
1876 | if (status) | |
1877 | goto err; | |
1878 | ||
1879 | return 0; | |
1880 | err: | |
6193d699 | 1881 | musb->g.dev.parent = NULL; |
0f91349b | 1882 | device_unregister(&musb->g.dev); |
550a7375 FB |
1883 | return status; |
1884 | } | |
1885 | ||
1886 | void musb_gadget_cleanup(struct musb *musb) | |
1887 | { | |
0f91349b | 1888 | usb_del_gadget_udc(&musb->g); |
6193d699 SAS |
1889 | if (musb->g.dev.parent) |
1890 | device_unregister(&musb->g.dev); | |
550a7375 FB |
1891 | } |
1892 | ||
1893 | /* | |
1894 | * Register the gadget driver. Used by gadget drivers when | |
1895 | * registering themselves with the controller. | |
1896 | * | |
1897 | * -EINVAL something went wrong (not driver) | |
1898 | * -EBUSY another gadget is already using the controller | |
b595076a | 1899 | * -ENOMEM no memory to perform the operation |
550a7375 FB |
1900 | * |
1901 | * @param driver the gadget driver | |
1902 | * @return <0 if error, 0 if everything is fine | |
1903 | */ | |
e71eb392 SAS |
1904 | static int musb_gadget_start(struct usb_gadget *g, |
1905 | struct usb_gadget_driver *driver) | |
550a7375 | 1906 | { |
e71eb392 | 1907 | struct musb *musb = gadget_to_musb(g); |
d445b6da | 1908 | struct usb_otg *otg = musb->xceiv->otg; |
032ec49f | 1909 | struct usb_hcd *hcd = musb_to_hcd(musb); |
63eed2b5 | 1910 | unsigned long flags; |
032ec49f | 1911 | int retval = 0; |
550a7375 | 1912 | |
032ec49f FB |
1913 | if (driver->max_speed < USB_SPEED_HIGH) { |
1914 | retval = -EINVAL; | |
1915 | goto err; | |
1916 | } | |
550a7375 | 1917 | |
7acc6197 HH |
1918 | pm_runtime_get_sync(musb->controller); |
1919 | ||
5c8a86e1 | 1920 | dev_dbg(musb->controller, "registering driver %s\n", driver->function); |
550a7375 | 1921 | |
e71eb392 | 1922 | musb->softconnect = 0; |
63eed2b5 | 1923 | musb->gadget_driver = driver; |
550a7375 | 1924 | |
63eed2b5 | 1925 | spin_lock_irqsave(&musb->lock, flags); |
e71eb392 | 1926 | musb->is_active = 1; |
550a7375 | 1927 | |
6e13c650 | 1928 | otg_set_peripheral(otg, &musb->g); |
63eed2b5 | 1929 | musb->xceiv->state = OTG_STATE_B_IDLE; |
63eed2b5 | 1930 | spin_unlock_irqrestore(&musb->lock, flags); |
550a7375 | 1931 | |
032ec49f FB |
1932 | /* REVISIT: funcall to other code, which also |
1933 | * handles power budgeting ... this way also | |
1934 | * ensures HdrcStart is indirectly called. | |
1935 | */ | |
1936 | retval = usb_add_hcd(hcd, 0, 0); | |
1937 | if (retval < 0) { | |
1938 | dev_dbg(musb->controller, "add_hcd failed, %d\n", retval); | |
1939 | goto err; | |
1940 | } | |
550a7375 | 1941 | |
032ec49f FB |
1942 | if ((musb->xceiv->last_event == USB_EVENT_ID) |
1943 | && otg->set_vbus) | |
1944 | otg_set_vbus(otg, 1); | |
63eed2b5 | 1945 | |
032ec49f | 1946 | hcd->self.uses_pio_for_control = 1; |
5f1e8ce7 | 1947 | |
cdefce16 JN |
1948 | if (musb->xceiv->last_event == USB_EVENT_NONE) |
1949 | pm_runtime_put(musb->controller); | |
550a7375 | 1950 | |
63eed2b5 FB |
1951 | return 0; |
1952 | ||
032ec49f | 1953 | err: |
550a7375 FB |
1954 | return retval; |
1955 | } | |
550a7375 FB |
1956 | |
1957 | static void stop_activity(struct musb *musb, struct usb_gadget_driver *driver) | |
1958 | { | |
1959 | int i; | |
1960 | struct musb_hw_ep *hw_ep; | |
1961 | ||
1962 | /* don't disconnect if it's not connected */ | |
1963 | if (musb->g.speed == USB_SPEED_UNKNOWN) | |
1964 | driver = NULL; | |
1965 | else | |
1966 | musb->g.speed = USB_SPEED_UNKNOWN; | |
1967 | ||
1968 | /* deactivate the hardware */ | |
1969 | if (musb->softconnect) { | |
1970 | musb->softconnect = 0; | |
1971 | musb_pullup(musb, 0); | |
1972 | } | |
1973 | musb_stop(musb); | |
1974 | ||
1975 | /* killing any outstanding requests will quiesce the driver; | |
1976 | * then report disconnect | |
1977 | */ | |
1978 | if (driver) { | |
1979 | for (i = 0, hw_ep = musb->endpoints; | |
1980 | i < musb->nr_endpoints; | |
1981 | i++, hw_ep++) { | |
1982 | musb_ep_select(musb->mregs, i); | |
1983 | if (hw_ep->is_shared_fifo /* || !epnum */) { | |
1984 | nuke(&hw_ep->ep_in, -ESHUTDOWN); | |
1985 | } else { | |
1986 | if (hw_ep->max_packet_sz_tx) | |
1987 | nuke(&hw_ep->ep_in, -ESHUTDOWN); | |
1988 | if (hw_ep->max_packet_sz_rx) | |
1989 | nuke(&hw_ep->ep_out, -ESHUTDOWN); | |
1990 | } | |
1991 | } | |
550a7375 FB |
1992 | } |
1993 | } | |
1994 | ||
1995 | /* | |
1996 | * Unregister the gadget driver. Used by gadget drivers when | |
1997 | * unregistering themselves from the controller. | |
1998 | * | |
1999 | * @param driver the gadget driver to unregister | |
2000 | */ | |
e71eb392 SAS |
2001 | static int musb_gadget_stop(struct usb_gadget *g, |
2002 | struct usb_gadget_driver *driver) | |
550a7375 | 2003 | { |
e71eb392 | 2004 | struct musb *musb = gadget_to_musb(g); |
63eed2b5 | 2005 | unsigned long flags; |
550a7375 | 2006 | |
7acc6197 HH |
2007 | if (musb->xceiv->last_event == USB_EVENT_NONE) |
2008 | pm_runtime_get_sync(musb->controller); | |
2009 | ||
63eed2b5 FB |
2010 | /* |
2011 | * REVISIT always use otg_set_peripheral() here too; | |
550a7375 FB |
2012 | * this needs to shut down the OTG engine. |
2013 | */ | |
2014 | ||
2015 | spin_lock_irqsave(&musb->lock, flags); | |
2016 | ||
550a7375 | 2017 | musb_hnp_stop(musb); |
550a7375 | 2018 | |
63eed2b5 | 2019 | (void) musb_gadget_vbus_draw(&musb->g, 0); |
550a7375 | 2020 | |
63eed2b5 FB |
2021 | musb->xceiv->state = OTG_STATE_UNDEFINED; |
2022 | stop_activity(musb, driver); | |
6e13c650 | 2023 | otg_set_peripheral(musb->xceiv->otg, NULL); |
550a7375 | 2024 | |
5c8a86e1 | 2025 | dev_dbg(musb->controller, "unregistering driver %s\n", driver->function); |
550a7375 | 2026 | |
63eed2b5 FB |
2027 | musb->is_active = 0; |
2028 | musb_platform_try_idle(musb, 0); | |
550a7375 FB |
2029 | spin_unlock_irqrestore(&musb->lock, flags); |
2030 | ||
032ec49f FB |
2031 | usb_remove_hcd(musb_to_hcd(musb)); |
2032 | /* | |
2033 | * FIXME we need to be able to register another | |
2034 | * gadget driver here and have everything work; | |
2035 | * that currently misbehaves. | |
2036 | */ | |
63eed2b5 | 2037 | |
7acc6197 HH |
2038 | pm_runtime_put(musb->controller); |
2039 | ||
63eed2b5 | 2040 | return 0; |
550a7375 | 2041 | } |
550a7375 FB |
2042 | |
2043 | /* ----------------------------------------------------------------------- */ | |
2044 | ||
2045 | /* lifecycle operations called through plat_uds.c */ | |
2046 | ||
2047 | void musb_g_resume(struct musb *musb) | |
2048 | { | |
2049 | musb->is_suspended = 0; | |
84e250ff | 2050 | switch (musb->xceiv->state) { |
550a7375 FB |
2051 | case OTG_STATE_B_IDLE: |
2052 | break; | |
2053 | case OTG_STATE_B_WAIT_ACON: | |
2054 | case OTG_STATE_B_PERIPHERAL: | |
2055 | musb->is_active = 1; | |
2056 | if (musb->gadget_driver && musb->gadget_driver->resume) { | |
2057 | spin_unlock(&musb->lock); | |
2058 | musb->gadget_driver->resume(&musb->g); | |
2059 | spin_lock(&musb->lock); | |
2060 | } | |
2061 | break; | |
2062 | default: | |
2063 | WARNING("unhandled RESUME transition (%s)\n", | |
3df00453 | 2064 | otg_state_string(musb->xceiv->state)); |
550a7375 FB |
2065 | } |
2066 | } | |
2067 | ||
2068 | /* called when SOF packets stop for 3+ msec */ | |
2069 | void musb_g_suspend(struct musb *musb) | |
2070 | { | |
2071 | u8 devctl; | |
2072 | ||
2073 | devctl = musb_readb(musb->mregs, MUSB_DEVCTL); | |
5c8a86e1 | 2074 | dev_dbg(musb->controller, "devctl %02x\n", devctl); |
550a7375 | 2075 | |
84e250ff | 2076 | switch (musb->xceiv->state) { |
550a7375 FB |
2077 | case OTG_STATE_B_IDLE: |
2078 | if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) | |
84e250ff | 2079 | musb->xceiv->state = OTG_STATE_B_PERIPHERAL; |
550a7375 FB |
2080 | break; |
2081 | case OTG_STATE_B_PERIPHERAL: | |
2082 | musb->is_suspended = 1; | |
2083 | if (musb->gadget_driver && musb->gadget_driver->suspend) { | |
2084 | spin_unlock(&musb->lock); | |
2085 | musb->gadget_driver->suspend(&musb->g); | |
2086 | spin_lock(&musb->lock); | |
2087 | } | |
2088 | break; | |
2089 | default: | |
2090 | /* REVISIT if B_HOST, clear DEVCTL.HOSTREQ; | |
2091 | * A_PERIPHERAL may need care too | |
2092 | */ | |
2093 | WARNING("unhandled SUSPEND transition (%s)\n", | |
3df00453 | 2094 | otg_state_string(musb->xceiv->state)); |
550a7375 FB |
2095 | } |
2096 | } | |
2097 | ||
2098 | /* Called during SRP */ | |
2099 | void musb_g_wakeup(struct musb *musb) | |
2100 | { | |
2101 | musb_gadget_wakeup(&musb->g); | |
2102 | } | |
2103 | ||
2104 | /* called when VBUS drops below session threshold, and in other cases */ | |
2105 | void musb_g_disconnect(struct musb *musb) | |
2106 | { | |
2107 | void __iomem *mregs = musb->mregs; | |
2108 | u8 devctl = musb_readb(mregs, MUSB_DEVCTL); | |
2109 | ||
5c8a86e1 | 2110 | dev_dbg(musb->controller, "devctl %02x\n", devctl); |
550a7375 FB |
2111 | |
2112 | /* clear HR */ | |
2113 | musb_writeb(mregs, MUSB_DEVCTL, devctl & MUSB_DEVCTL_SESSION); | |
2114 | ||
2115 | /* don't draw vbus until new b-default session */ | |
2116 | (void) musb_gadget_vbus_draw(&musb->g, 0); | |
2117 | ||
2118 | musb->g.speed = USB_SPEED_UNKNOWN; | |
2119 | if (musb->gadget_driver && musb->gadget_driver->disconnect) { | |
2120 | spin_unlock(&musb->lock); | |
2121 | musb->gadget_driver->disconnect(&musb->g); | |
2122 | spin_lock(&musb->lock); | |
2123 | } | |
2124 | ||
84e250ff | 2125 | switch (musb->xceiv->state) { |
550a7375 | 2126 | default: |
5c8a86e1 | 2127 | dev_dbg(musb->controller, "Unhandled disconnect %s, setting a_idle\n", |
3df00453 | 2128 | otg_state_string(musb->xceiv->state)); |
84e250ff | 2129 | musb->xceiv->state = OTG_STATE_A_IDLE; |
ab983f2a | 2130 | MUSB_HST_MODE(musb); |
550a7375 FB |
2131 | break; |
2132 | case OTG_STATE_A_PERIPHERAL: | |
1de00dae | 2133 | musb->xceiv->state = OTG_STATE_A_WAIT_BCON; |
ab983f2a | 2134 | MUSB_HST_MODE(musb); |
550a7375 FB |
2135 | break; |
2136 | case OTG_STATE_B_WAIT_ACON: | |
2137 | case OTG_STATE_B_HOST: | |
550a7375 FB |
2138 | case OTG_STATE_B_PERIPHERAL: |
2139 | case OTG_STATE_B_IDLE: | |
84e250ff | 2140 | musb->xceiv->state = OTG_STATE_B_IDLE; |
550a7375 FB |
2141 | break; |
2142 | case OTG_STATE_B_SRP_INIT: | |
2143 | break; | |
2144 | } | |
2145 | ||
2146 | musb->is_active = 0; | |
2147 | } | |
2148 | ||
2149 | void musb_g_reset(struct musb *musb) | |
2150 | __releases(musb->lock) | |
2151 | __acquires(musb->lock) | |
2152 | { | |
2153 | void __iomem *mbase = musb->mregs; | |
2154 | u8 devctl = musb_readb(mbase, MUSB_DEVCTL); | |
2155 | u8 power; | |
2156 | ||
5c8a86e1 | 2157 | dev_dbg(musb->controller, "<== %s addr=%x driver '%s'\n", |
550a7375 FB |
2158 | (devctl & MUSB_DEVCTL_BDEVICE) |
2159 | ? "B-Device" : "A-Device", | |
2160 | musb_readb(mbase, MUSB_FADDR), | |
2161 | musb->gadget_driver | |
2162 | ? musb->gadget_driver->driver.name | |
2163 | : NULL | |
2164 | ); | |
2165 | ||
2166 | /* report disconnect, if we didn't already (flushing EP state) */ | |
2167 | if (musb->g.speed != USB_SPEED_UNKNOWN) | |
2168 | musb_g_disconnect(musb); | |
2169 | ||
2170 | /* clear HR */ | |
2171 | else if (devctl & MUSB_DEVCTL_HR) | |
2172 | musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION); | |
2173 | ||
2174 | ||
2175 | /* what speed did we negotiate? */ | |
2176 | power = musb_readb(mbase, MUSB_POWER); | |
2177 | musb->g.speed = (power & MUSB_POWER_HSMODE) | |
2178 | ? USB_SPEED_HIGH : USB_SPEED_FULL; | |
2179 | ||
2180 | /* start in USB_STATE_DEFAULT */ | |
2181 | musb->is_active = 1; | |
2182 | musb->is_suspended = 0; | |
2183 | MUSB_DEV_MODE(musb); | |
2184 | musb->address = 0; | |
2185 | musb->ep0_state = MUSB_EP0_STAGE_SETUP; | |
2186 | ||
2187 | musb->may_wakeup = 0; | |
2188 | musb->g.b_hnp_enable = 0; | |
2189 | musb->g.a_alt_hnp_support = 0; | |
2190 | musb->g.a_hnp_support = 0; | |
2191 | ||
2192 | /* Normal reset, as B-Device; | |
2193 | * or else after HNP, as A-Device | |
2194 | */ | |
2195 | if (devctl & MUSB_DEVCTL_BDEVICE) { | |
84e250ff | 2196 | musb->xceiv->state = OTG_STATE_B_PERIPHERAL; |
550a7375 | 2197 | musb->g.is_a_peripheral = 0; |
032ec49f | 2198 | } else { |
84e250ff | 2199 | musb->xceiv->state = OTG_STATE_A_PERIPHERAL; |
550a7375 | 2200 | musb->g.is_a_peripheral = 1; |
032ec49f | 2201 | } |
550a7375 FB |
2202 | |
2203 | /* start with default limits on VBUS power draw */ | |
032ec49f | 2204 | (void) musb_gadget_vbus_draw(&musb->g, 8); |
550a7375 | 2205 | } |