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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> | |
43 | #include <linux/moduleparam.h> | |
44 | #include <linux/stat.h> | |
45 | #include <linux/dma-mapping.h> | |
46 | ||
47 | #include "musb_core.h" | |
48 | ||
49 | ||
50 | /* MUSB PERIPHERAL status 3-mar-2006: | |
51 | * | |
52 | * - EP0 seems solid. It passes both USBCV and usbtest control cases. | |
53 | * Minor glitches: | |
54 | * | |
55 | * + remote wakeup to Linux hosts work, but saw USBCV failures; | |
56 | * in one test run (operator error?) | |
57 | * + endpoint halt tests -- in both usbtest and usbcv -- seem | |
58 | * to break when dma is enabled ... is something wrongly | |
59 | * clearing SENDSTALL? | |
60 | * | |
61 | * - Mass storage behaved ok when last tested. Network traffic patterns | |
62 | * (with lots of short transfers etc) need retesting; they turn up the | |
63 | * worst cases of the DMA, since short packets are typical but are not | |
64 | * required. | |
65 | * | |
66 | * - TX/IN | |
67 | * + both pio and dma behave in with network and g_zero tests | |
68 | * + no cppi throughput issues other than no-hw-queueing | |
69 | * + failed with FLAT_REG (DaVinci) | |
70 | * + seems to behave with double buffering, PIO -and- CPPI | |
71 | * + with gadgetfs + AIO, requests got lost? | |
72 | * | |
73 | * - RX/OUT | |
74 | * + both pio and dma behave in with network and g_zero tests | |
75 | * + dma is slow in typical case (short_not_ok is clear) | |
76 | * + double buffering ok with PIO | |
77 | * + double buffering *FAILS* with CPPI, wrong data bytes sometimes | |
78 | * + request lossage observed with gadgetfs | |
79 | * | |
80 | * - ISO not tested ... might work, but only weakly isochronous | |
81 | * | |
82 | * - Gadget driver disabling of softconnect during bind() is ignored; so | |
83 | * drivers can't hold off host requests until userspace is ready. | |
84 | * (Workaround: they can turn it off later.) | |
85 | * | |
86 | * - PORTABILITY (assumes PIO works): | |
87 | * + DaVinci, basically works with cppi dma | |
88 | * + OMAP 2430, ditto with mentor dma | |
89 | * + TUSB 6010, platform-specific dma in the works | |
90 | */ | |
91 | ||
92 | /* ----------------------------------------------------------------------- */ | |
93 | ||
94 | /* | |
95 | * Immediately complete a request. | |
96 | * | |
97 | * @param request the request to complete | |
98 | * @param status the status to complete the request with | |
99 | * Context: controller locked, IRQs blocked. | |
100 | */ | |
101 | void musb_g_giveback( | |
102 | struct musb_ep *ep, | |
103 | struct usb_request *request, | |
104 | int status) | |
105 | __releases(ep->musb->lock) | |
106 | __acquires(ep->musb->lock) | |
107 | { | |
108 | struct musb_request *req; | |
109 | struct musb *musb; | |
110 | int busy = ep->busy; | |
111 | ||
112 | req = to_musb_request(request); | |
113 | ||
114 | list_del(&request->list); | |
115 | if (req->request.status == -EINPROGRESS) | |
116 | req->request.status = status; | |
117 | musb = req->musb; | |
118 | ||
119 | ep->busy = 1; | |
120 | spin_unlock(&musb->lock); | |
121 | if (is_dma_capable()) { | |
122 | if (req->mapped) { | |
123 | dma_unmap_single(musb->controller, | |
124 | req->request.dma, | |
125 | req->request.length, | |
126 | req->tx | |
127 | ? DMA_TO_DEVICE | |
128 | : DMA_FROM_DEVICE); | |
129 | req->request.dma = DMA_ADDR_INVALID; | |
130 | req->mapped = 0; | |
131 | } else if (req->request.dma != DMA_ADDR_INVALID) | |
132 | dma_sync_single_for_cpu(musb->controller, | |
133 | req->request.dma, | |
134 | req->request.length, | |
135 | req->tx | |
136 | ? DMA_TO_DEVICE | |
137 | : DMA_FROM_DEVICE); | |
138 | } | |
139 | if (request->status == 0) | |
140 | DBG(5, "%s done request %p, %d/%d\n", | |
141 | ep->end_point.name, request, | |
142 | req->request.actual, req->request.length); | |
143 | else | |
144 | DBG(2, "%s request %p, %d/%d fault %d\n", | |
145 | ep->end_point.name, request, | |
146 | req->request.actual, req->request.length, | |
147 | request->status); | |
148 | req->request.complete(&req->ep->end_point, &req->request); | |
149 | spin_lock(&musb->lock); | |
150 | ep->busy = busy; | |
151 | } | |
152 | ||
153 | /* ----------------------------------------------------------------------- */ | |
154 | ||
155 | /* | |
156 | * Abort requests queued to an endpoint using the status. Synchronous. | |
157 | * caller locked controller and blocked irqs, and selected this ep. | |
158 | */ | |
159 | static void nuke(struct musb_ep *ep, const int status) | |
160 | { | |
161 | struct musb_request *req = NULL; | |
162 | void __iomem *epio = ep->musb->endpoints[ep->current_epnum].regs; | |
163 | ||
164 | ep->busy = 1; | |
165 | ||
166 | if (is_dma_capable() && ep->dma) { | |
167 | struct dma_controller *c = ep->musb->dma_controller; | |
168 | int value; | |
b6e434a5 | 169 | |
550a7375 | 170 | if (ep->is_in) { |
b6e434a5 SS |
171 | /* |
172 | * The programming guide says that we must not clear | |
173 | * the DMAMODE bit before DMAENAB, so we only | |
174 | * clear it in the second write... | |
175 | */ | |
550a7375 | 176 | musb_writew(epio, MUSB_TXCSR, |
b6e434a5 | 177 | MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO); |
550a7375 FB |
178 | musb_writew(epio, MUSB_TXCSR, |
179 | 0 | MUSB_TXCSR_FLUSHFIFO); | |
180 | } else { | |
181 | musb_writew(epio, MUSB_RXCSR, | |
182 | 0 | MUSB_RXCSR_FLUSHFIFO); | |
183 | musb_writew(epio, MUSB_RXCSR, | |
184 | 0 | MUSB_RXCSR_FLUSHFIFO); | |
185 | } | |
186 | ||
187 | value = c->channel_abort(ep->dma); | |
188 | DBG(value ? 1 : 6, "%s: abort DMA --> %d\n", ep->name, value); | |
189 | c->channel_release(ep->dma); | |
190 | ep->dma = NULL; | |
191 | } | |
192 | ||
193 | while (!list_empty(&(ep->req_list))) { | |
194 | req = container_of(ep->req_list.next, struct musb_request, | |
195 | request.list); | |
196 | musb_g_giveback(ep, &req->request, status); | |
197 | } | |
198 | } | |
199 | ||
200 | /* ----------------------------------------------------------------------- */ | |
201 | ||
202 | /* Data transfers - pure PIO, pure DMA, or mixed mode */ | |
203 | ||
204 | /* | |
205 | * This assumes the separate CPPI engine is responding to DMA requests | |
206 | * from the usb core ... sequenced a bit differently from mentor dma. | |
207 | */ | |
208 | ||
209 | static inline int max_ep_writesize(struct musb *musb, struct musb_ep *ep) | |
210 | { | |
211 | if (can_bulk_split(musb, ep->type)) | |
212 | return ep->hw_ep->max_packet_sz_tx; | |
213 | else | |
214 | return ep->packet_sz; | |
215 | } | |
216 | ||
217 | ||
218 | #ifdef CONFIG_USB_INVENTRA_DMA | |
219 | ||
220 | /* Peripheral tx (IN) using Mentor DMA works as follows: | |
221 | Only mode 0 is used for transfers <= wPktSize, | |
222 | mode 1 is used for larger transfers, | |
223 | ||
224 | One of the following happens: | |
225 | - Host sends IN token which causes an endpoint interrupt | |
226 | -> TxAvail | |
227 | -> if DMA is currently busy, exit. | |
228 | -> if queue is non-empty, txstate(). | |
229 | ||
230 | - Request is queued by the gadget driver. | |
231 | -> if queue was previously empty, txstate() | |
232 | ||
233 | txstate() | |
234 | -> start | |
235 | /\ -> setup DMA | |
236 | | (data is transferred to the FIFO, then sent out when | |
237 | | IN token(s) are recd from Host. | |
238 | | -> DMA interrupt on completion | |
239 | | calls TxAvail. | |
b6e434a5 | 240 | | -> stop DMA, ~DMAENAB, |
550a7375 FB |
241 | | -> set TxPktRdy for last short pkt or zlp |
242 | | -> Complete Request | |
243 | | -> Continue next request (call txstate) | |
244 | |___________________________________| | |
245 | ||
246 | * Non-Mentor DMA engines can of course work differently, such as by | |
247 | * upleveling from irq-per-packet to irq-per-buffer. | |
248 | */ | |
249 | ||
250 | #endif | |
251 | ||
252 | /* | |
253 | * An endpoint is transmitting data. This can be called either from | |
254 | * the IRQ routine or from ep.queue() to kickstart a request on an | |
255 | * endpoint. | |
256 | * | |
257 | * Context: controller locked, IRQs blocked, endpoint selected | |
258 | */ | |
259 | static void txstate(struct musb *musb, struct musb_request *req) | |
260 | { | |
261 | u8 epnum = req->epnum; | |
262 | struct musb_ep *musb_ep; | |
263 | void __iomem *epio = musb->endpoints[epnum].regs; | |
264 | struct usb_request *request; | |
265 | u16 fifo_count = 0, csr; | |
266 | int use_dma = 0; | |
267 | ||
268 | musb_ep = req->ep; | |
269 | ||
270 | /* we shouldn't get here while DMA is active ... but we do ... */ | |
271 | if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) { | |
272 | DBG(4, "dma pending...\n"); | |
273 | return; | |
274 | } | |
275 | ||
276 | /* read TXCSR before */ | |
277 | csr = musb_readw(epio, MUSB_TXCSR); | |
278 | ||
279 | request = &req->request; | |
280 | fifo_count = min(max_ep_writesize(musb, musb_ep), | |
281 | (int)(request->length - request->actual)); | |
282 | ||
283 | if (csr & MUSB_TXCSR_TXPKTRDY) { | |
284 | DBG(5, "%s old packet still ready , txcsr %03x\n", | |
285 | musb_ep->end_point.name, csr); | |
286 | return; | |
287 | } | |
288 | ||
289 | if (csr & MUSB_TXCSR_P_SENDSTALL) { | |
290 | DBG(5, "%s stalling, txcsr %03x\n", | |
291 | musb_ep->end_point.name, csr); | |
292 | return; | |
293 | } | |
294 | ||
295 | DBG(4, "hw_ep%d, maxpacket %d, fifo count %d, txcsr %03x\n", | |
296 | epnum, musb_ep->packet_sz, fifo_count, | |
297 | csr); | |
298 | ||
299 | #ifndef CONFIG_MUSB_PIO_ONLY | |
300 | if (is_dma_capable() && musb_ep->dma) { | |
301 | struct dma_controller *c = musb->dma_controller; | |
302 | ||
303 | use_dma = (request->dma != DMA_ADDR_INVALID); | |
304 | ||
305 | /* MUSB_TXCSR_P_ISO is still set correctly */ | |
306 | ||
307 | #ifdef CONFIG_USB_INVENTRA_DMA | |
308 | { | |
309 | size_t request_size; | |
310 | ||
311 | /* setup DMA, then program endpoint CSR */ | |
312 | request_size = min(request->length, | |
313 | musb_ep->dma->max_len); | |
d1043a26 | 314 | if (request_size < musb_ep->packet_sz) |
550a7375 FB |
315 | musb_ep->dma->desired_mode = 0; |
316 | else | |
317 | musb_ep->dma->desired_mode = 1; | |
318 | ||
319 | use_dma = use_dma && c->channel_program( | |
320 | musb_ep->dma, musb_ep->packet_sz, | |
321 | musb_ep->dma->desired_mode, | |
322 | request->dma, request_size); | |
323 | if (use_dma) { | |
324 | if (musb_ep->dma->desired_mode == 0) { | |
b6e434a5 SS |
325 | /* |
326 | * We must not clear the DMAMODE bit | |
327 | * before the DMAENAB bit -- and the | |
328 | * latter doesn't always get cleared | |
329 | * before we get here... | |
330 | */ | |
331 | csr &= ~(MUSB_TXCSR_AUTOSET | |
332 | | MUSB_TXCSR_DMAENAB); | |
333 | musb_writew(epio, MUSB_TXCSR, csr | |
334 | | MUSB_TXCSR_P_WZC_BITS); | |
335 | csr &= ~MUSB_TXCSR_DMAMODE; | |
550a7375 FB |
336 | csr |= (MUSB_TXCSR_DMAENAB | |
337 | MUSB_TXCSR_MODE); | |
338 | /* against programming guide */ | |
339 | } else | |
340 | csr |= (MUSB_TXCSR_AUTOSET | |
341 | | MUSB_TXCSR_DMAENAB | |
342 | | MUSB_TXCSR_DMAMODE | |
343 | | MUSB_TXCSR_MODE); | |
344 | ||
345 | csr &= ~MUSB_TXCSR_P_UNDERRUN; | |
346 | musb_writew(epio, MUSB_TXCSR, csr); | |
347 | } | |
348 | } | |
349 | ||
350 | #elif defined(CONFIG_USB_TI_CPPI_DMA) | |
351 | /* program endpoint CSR first, then setup DMA */ | |
b6e434a5 | 352 | csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY); |
37e3ee99 SS |
353 | csr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_DMAMODE | |
354 | MUSB_TXCSR_MODE; | |
550a7375 FB |
355 | musb_writew(epio, MUSB_TXCSR, |
356 | (MUSB_TXCSR_P_WZC_BITS & ~MUSB_TXCSR_P_UNDERRUN) | |
357 | | csr); | |
358 | ||
359 | /* ensure writebuffer is empty */ | |
360 | csr = musb_readw(epio, MUSB_TXCSR); | |
361 | ||
362 | /* NOTE host side sets DMAENAB later than this; both are | |
363 | * OK since the transfer dma glue (between CPPI and Mentor | |
364 | * fifos) just tells CPPI it could start. Data only moves | |
365 | * to the USB TX fifo when both fifos are ready. | |
366 | */ | |
367 | ||
368 | /* "mode" is irrelevant here; handle terminating ZLPs like | |
369 | * PIO does, since the hardware RNDIS mode seems unreliable | |
370 | * except for the last-packet-is-already-short case. | |
371 | */ | |
372 | use_dma = use_dma && c->channel_program( | |
373 | musb_ep->dma, musb_ep->packet_sz, | |
374 | 0, | |
375 | request->dma, | |
376 | request->length); | |
377 | if (!use_dma) { | |
378 | c->channel_release(musb_ep->dma); | |
379 | musb_ep->dma = NULL; | |
b6e434a5 SS |
380 | csr &= ~MUSB_TXCSR_DMAENAB; |
381 | musb_writew(epio, MUSB_TXCSR, csr); | |
550a7375 FB |
382 | /* invariant: prequest->buf is non-null */ |
383 | } | |
384 | #elif defined(CONFIG_USB_TUSB_OMAP_DMA) | |
385 | use_dma = use_dma && c->channel_program( | |
386 | musb_ep->dma, musb_ep->packet_sz, | |
387 | request->zero, | |
388 | request->dma, | |
389 | request->length); | |
390 | #endif | |
391 | } | |
392 | #endif | |
393 | ||
394 | if (!use_dma) { | |
395 | musb_write_fifo(musb_ep->hw_ep, fifo_count, | |
396 | (u8 *) (request->buf + request->actual)); | |
397 | request->actual += fifo_count; | |
398 | csr |= MUSB_TXCSR_TXPKTRDY; | |
399 | csr &= ~MUSB_TXCSR_P_UNDERRUN; | |
400 | musb_writew(epio, MUSB_TXCSR, csr); | |
401 | } | |
402 | ||
403 | /* host may already have the data when this message shows... */ | |
404 | DBG(3, "%s TX/IN %s len %d/%d, txcsr %04x, fifo %d/%d\n", | |
405 | musb_ep->end_point.name, use_dma ? "dma" : "pio", | |
406 | request->actual, request->length, | |
407 | musb_readw(epio, MUSB_TXCSR), | |
408 | fifo_count, | |
409 | musb_readw(epio, MUSB_TXMAXP)); | |
410 | } | |
411 | ||
412 | /* | |
413 | * FIFO state update (e.g. data ready). | |
414 | * Called from IRQ, with controller locked. | |
415 | */ | |
416 | void musb_g_tx(struct musb *musb, u8 epnum) | |
417 | { | |
418 | u16 csr; | |
419 | struct usb_request *request; | |
420 | u8 __iomem *mbase = musb->mregs; | |
421 | struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_in; | |
422 | void __iomem *epio = musb->endpoints[epnum].regs; | |
423 | struct dma_channel *dma; | |
424 | ||
425 | musb_ep_select(mbase, epnum); | |
426 | request = next_request(musb_ep); | |
427 | ||
428 | csr = musb_readw(epio, MUSB_TXCSR); | |
429 | DBG(4, "<== %s, txcsr %04x\n", musb_ep->end_point.name, csr); | |
430 | ||
431 | dma = is_dma_capable() ? musb_ep->dma : NULL; | |
432 | do { | |
433 | /* REVISIT for high bandwidth, MUSB_TXCSR_P_INCOMPTX | |
434 | * probably rates reporting as a host error | |
435 | */ | |
436 | if (csr & MUSB_TXCSR_P_SENTSTALL) { | |
437 | csr |= MUSB_TXCSR_P_WZC_BITS; | |
438 | csr &= ~MUSB_TXCSR_P_SENTSTALL; | |
439 | musb_writew(epio, MUSB_TXCSR, csr); | |
550a7375 FB |
440 | break; |
441 | } | |
442 | ||
443 | if (csr & MUSB_TXCSR_P_UNDERRUN) { | |
444 | /* we NAKed, no big deal ... little reason to care */ | |
445 | csr |= MUSB_TXCSR_P_WZC_BITS; | |
446 | csr &= ~(MUSB_TXCSR_P_UNDERRUN | |
447 | | MUSB_TXCSR_TXPKTRDY); | |
448 | musb_writew(epio, MUSB_TXCSR, csr); | |
449 | DBG(20, "underrun on ep%d, req %p\n", epnum, request); | |
450 | } | |
451 | ||
452 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
453 | /* SHOULD NOT HAPPEN ... has with cppi though, after | |
454 | * changing SENDSTALL (and other cases); harmless? | |
455 | */ | |
456 | DBG(5, "%s dma still busy?\n", musb_ep->end_point.name); | |
457 | break; | |
458 | } | |
459 | ||
460 | if (request) { | |
461 | u8 is_dma = 0; | |
462 | ||
463 | if (dma && (csr & MUSB_TXCSR_DMAENAB)) { | |
464 | is_dma = 1; | |
465 | csr |= MUSB_TXCSR_P_WZC_BITS; | |
466 | csr &= ~(MUSB_TXCSR_DMAENAB | |
467 | | MUSB_TXCSR_P_UNDERRUN | |
468 | | MUSB_TXCSR_TXPKTRDY); | |
469 | musb_writew(epio, MUSB_TXCSR, csr); | |
470 | /* ensure writebuffer is empty */ | |
471 | csr = musb_readw(epio, MUSB_TXCSR); | |
472 | request->actual += musb_ep->dma->actual_len; | |
473 | DBG(4, "TXCSR%d %04x, dma off, " | |
474 | "len %zu, req %p\n", | |
475 | epnum, csr, | |
476 | musb_ep->dma->actual_len, | |
477 | request); | |
478 | } | |
479 | ||
480 | if (is_dma || request->actual == request->length) { | |
481 | ||
482 | /* First, maybe a terminating short packet. | |
483 | * Some DMA engines might handle this by | |
484 | * themselves. | |
485 | */ | |
486 | if ((request->zero | |
487 | && request->length | |
488 | && (request->length | |
489 | % musb_ep->packet_sz) | |
490 | == 0) | |
491 | #ifdef CONFIG_USB_INVENTRA_DMA | |
492 | || (is_dma && | |
493 | ((!dma->desired_mode) || | |
494 | (request->actual & | |
495 | (musb_ep->packet_sz - 1)))) | |
496 | #endif | |
497 | ) { | |
498 | /* on dma completion, fifo may not | |
499 | * be available yet ... | |
500 | */ | |
501 | if (csr & MUSB_TXCSR_TXPKTRDY) | |
502 | break; | |
503 | ||
504 | DBG(4, "sending zero pkt\n"); | |
505 | musb_writew(epio, MUSB_TXCSR, | |
506 | MUSB_TXCSR_MODE | |
507 | | MUSB_TXCSR_TXPKTRDY); | |
508 | request->zero = 0; | |
509 | } | |
510 | ||
511 | /* ... or if not, then complete it */ | |
512 | musb_g_giveback(musb_ep, request, 0); | |
513 | ||
514 | /* kickstart next transfer if appropriate; | |
515 | * the packet that just completed might not | |
516 | * be transmitted for hours or days. | |
517 | * REVISIT for double buffering... | |
518 | * FIXME revisit for stalls too... | |
519 | */ | |
520 | musb_ep_select(mbase, epnum); | |
521 | csr = musb_readw(epio, MUSB_TXCSR); | |
522 | if (csr & MUSB_TXCSR_FIFONOTEMPTY) | |
523 | break; | |
524 | request = musb_ep->desc | |
525 | ? next_request(musb_ep) | |
526 | : NULL; | |
527 | if (!request) { | |
528 | DBG(4, "%s idle now\n", | |
529 | musb_ep->end_point.name); | |
530 | break; | |
531 | } | |
532 | } | |
533 | ||
534 | txstate(musb, to_musb_request(request)); | |
535 | } | |
536 | ||
537 | } while (0); | |
538 | } | |
539 | ||
540 | /* ------------------------------------------------------------ */ | |
541 | ||
542 | #ifdef CONFIG_USB_INVENTRA_DMA | |
543 | ||
544 | /* Peripheral rx (OUT) using Mentor DMA works as follows: | |
545 | - Only mode 0 is used. | |
546 | ||
547 | - Request is queued by the gadget class driver. | |
548 | -> if queue was previously empty, rxstate() | |
549 | ||
550 | - Host sends OUT token which causes an endpoint interrupt | |
551 | /\ -> RxReady | |
552 | | -> if request queued, call rxstate | |
553 | | /\ -> setup DMA | |
554 | | | -> DMA interrupt on completion | |
555 | | | -> RxReady | |
556 | | | -> stop DMA | |
557 | | | -> ack the read | |
558 | | | -> if data recd = max expected | |
559 | | | by the request, or host | |
560 | | | sent a short packet, | |
561 | | | complete the request, | |
562 | | | and start the next one. | |
563 | | |_____________________________________| | |
564 | | else just wait for the host | |
565 | | to send the next OUT token. | |
566 | |__________________________________________________| | |
567 | ||
568 | * Non-Mentor DMA engines can of course work differently. | |
569 | */ | |
570 | ||
571 | #endif | |
572 | ||
573 | /* | |
574 | * Context: controller locked, IRQs blocked, endpoint selected | |
575 | */ | |
576 | static void rxstate(struct musb *musb, struct musb_request *req) | |
577 | { | |
550a7375 FB |
578 | const u8 epnum = req->epnum; |
579 | struct usb_request *request = &req->request; | |
580 | struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_out; | |
581 | void __iomem *epio = musb->endpoints[epnum].regs; | |
c2c96321 | 582 | unsigned fifo_count = 0; |
550a7375 | 583 | u16 len = musb_ep->packet_sz; |
cea83241 | 584 | u16 csr = musb_readw(epio, MUSB_RXCSR); |
550a7375 | 585 | |
cea83241 SS |
586 | /* We shouldn't get here while DMA is active, but we do... */ |
587 | if (dma_channel_status(musb_ep->dma) == MUSB_DMA_STATUS_BUSY) { | |
588 | DBG(4, "DMA pending...\n"); | |
589 | return; | |
590 | } | |
591 | ||
592 | if (csr & MUSB_RXCSR_P_SENDSTALL) { | |
593 | DBG(5, "%s stalling, RXCSR %04x\n", | |
594 | musb_ep->end_point.name, csr); | |
595 | return; | |
596 | } | |
550a7375 FB |
597 | |
598 | if (is_cppi_enabled() && musb_ep->dma) { | |
599 | struct dma_controller *c = musb->dma_controller; | |
600 | struct dma_channel *channel = musb_ep->dma; | |
601 | ||
602 | /* NOTE: CPPI won't actually stop advancing the DMA | |
603 | * queue after short packet transfers, so this is almost | |
604 | * always going to run as IRQ-per-packet DMA so that | |
605 | * faults will be handled correctly. | |
606 | */ | |
607 | if (c->channel_program(channel, | |
608 | musb_ep->packet_sz, | |
609 | !request->short_not_ok, | |
610 | request->dma + request->actual, | |
611 | request->length - request->actual)) { | |
612 | ||
613 | /* make sure that if an rxpkt arrived after the irq, | |
614 | * the cppi engine will be ready to take it as soon | |
615 | * as DMA is enabled | |
616 | */ | |
617 | csr &= ~(MUSB_RXCSR_AUTOCLEAR | |
618 | | MUSB_RXCSR_DMAMODE); | |
619 | csr |= MUSB_RXCSR_DMAENAB | MUSB_RXCSR_P_WZC_BITS; | |
620 | musb_writew(epio, MUSB_RXCSR, csr); | |
621 | return; | |
622 | } | |
623 | } | |
624 | ||
625 | if (csr & MUSB_RXCSR_RXPKTRDY) { | |
626 | len = musb_readw(epio, MUSB_RXCOUNT); | |
627 | if (request->actual < request->length) { | |
628 | #ifdef CONFIG_USB_INVENTRA_DMA | |
629 | if (is_dma_capable() && musb_ep->dma) { | |
630 | struct dma_controller *c; | |
631 | struct dma_channel *channel; | |
632 | int use_dma = 0; | |
633 | ||
634 | c = musb->dma_controller; | |
635 | channel = musb_ep->dma; | |
636 | ||
637 | /* We use DMA Req mode 0 in rx_csr, and DMA controller operates in | |
638 | * mode 0 only. So we do not get endpoint interrupts due to DMA | |
639 | * completion. We only get interrupts from DMA controller. | |
640 | * | |
641 | * We could operate in DMA mode 1 if we knew the size of the tranfer | |
642 | * in advance. For mass storage class, request->length = what the host | |
643 | * sends, so that'd work. But for pretty much everything else, | |
644 | * request->length is routinely more than what the host sends. For | |
645 | * most these gadgets, end of is signified either by a short packet, | |
646 | * or filling the last byte of the buffer. (Sending extra data in | |
647 | * that last pckate should trigger an overflow fault.) But in mode 1, | |
648 | * we don't get DMA completion interrrupt for short packets. | |
649 | * | |
650 | * Theoretically, we could enable DMAReq irq (MUSB_RXCSR_DMAMODE = 1), | |
651 | * to get endpoint interrupt on every DMA req, but that didn't seem | |
652 | * to work reliably. | |
653 | * | |
654 | * REVISIT an updated g_file_storage can set req->short_not_ok, which | |
655 | * then becomes usable as a runtime "use mode 1" hint... | |
656 | */ | |
657 | ||
658 | csr |= MUSB_RXCSR_DMAENAB; | |
659 | #ifdef USE_MODE1 | |
660 | csr |= MUSB_RXCSR_AUTOCLEAR; | |
661 | /* csr |= MUSB_RXCSR_DMAMODE; */ | |
662 | ||
663 | /* this special sequence (enabling and then | |
664 | * disabling MUSB_RXCSR_DMAMODE) is required | |
665 | * to get DMAReq to activate | |
666 | */ | |
667 | musb_writew(epio, MUSB_RXCSR, | |
668 | csr | MUSB_RXCSR_DMAMODE); | |
669 | #endif | |
670 | musb_writew(epio, MUSB_RXCSR, csr); | |
671 | ||
672 | if (request->actual < request->length) { | |
673 | int transfer_size = 0; | |
674 | #ifdef USE_MODE1 | |
675 | transfer_size = min(request->length, | |
676 | channel->max_len); | |
677 | #else | |
678 | transfer_size = len; | |
679 | #endif | |
680 | if (transfer_size <= musb_ep->packet_sz) | |
681 | musb_ep->dma->desired_mode = 0; | |
682 | else | |
683 | musb_ep->dma->desired_mode = 1; | |
684 | ||
685 | use_dma = c->channel_program( | |
686 | channel, | |
687 | musb_ep->packet_sz, | |
688 | channel->desired_mode, | |
689 | request->dma | |
690 | + request->actual, | |
691 | transfer_size); | |
692 | } | |
693 | ||
694 | if (use_dma) | |
695 | return; | |
696 | } | |
697 | #endif /* Mentor's DMA */ | |
698 | ||
699 | fifo_count = request->length - request->actual; | |
700 | DBG(3, "%s OUT/RX pio fifo %d/%d, maxpacket %d\n", | |
701 | musb_ep->end_point.name, | |
702 | len, fifo_count, | |
703 | musb_ep->packet_sz); | |
704 | ||
c2c96321 | 705 | fifo_count = min_t(unsigned, len, fifo_count); |
550a7375 FB |
706 | |
707 | #ifdef CONFIG_USB_TUSB_OMAP_DMA | |
708 | if (tusb_dma_omap() && musb_ep->dma) { | |
709 | struct dma_controller *c = musb->dma_controller; | |
710 | struct dma_channel *channel = musb_ep->dma; | |
711 | u32 dma_addr = request->dma + request->actual; | |
712 | int ret; | |
713 | ||
714 | ret = c->channel_program(channel, | |
715 | musb_ep->packet_sz, | |
716 | channel->desired_mode, | |
717 | dma_addr, | |
718 | fifo_count); | |
719 | if (ret) | |
720 | return; | |
721 | } | |
722 | #endif | |
723 | ||
724 | musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *) | |
725 | (request->buf + request->actual)); | |
726 | request->actual += fifo_count; | |
727 | ||
728 | /* REVISIT if we left anything in the fifo, flush | |
729 | * it and report -EOVERFLOW | |
730 | */ | |
731 | ||
732 | /* ack the read! */ | |
733 | csr |= MUSB_RXCSR_P_WZC_BITS; | |
734 | csr &= ~MUSB_RXCSR_RXPKTRDY; | |
735 | musb_writew(epio, MUSB_RXCSR, csr); | |
736 | } | |
737 | } | |
738 | ||
739 | /* reach the end or short packet detected */ | |
740 | if (request->actual == request->length || len < musb_ep->packet_sz) | |
741 | musb_g_giveback(musb_ep, request, 0); | |
742 | } | |
743 | ||
744 | /* | |
745 | * Data ready for a request; called from IRQ | |
746 | */ | |
747 | void musb_g_rx(struct musb *musb, u8 epnum) | |
748 | { | |
749 | u16 csr; | |
750 | struct usb_request *request; | |
751 | void __iomem *mbase = musb->mregs; | |
752 | struct musb_ep *musb_ep = &musb->endpoints[epnum].ep_out; | |
753 | void __iomem *epio = musb->endpoints[epnum].regs; | |
754 | struct dma_channel *dma; | |
755 | ||
756 | musb_ep_select(mbase, epnum); | |
757 | ||
758 | request = next_request(musb_ep); | |
759 | ||
760 | csr = musb_readw(epio, MUSB_RXCSR); | |
761 | dma = is_dma_capable() ? musb_ep->dma : NULL; | |
762 | ||
763 | DBG(4, "<== %s, rxcsr %04x%s %p\n", musb_ep->end_point.name, | |
764 | csr, dma ? " (dma)" : "", request); | |
765 | ||
766 | if (csr & MUSB_RXCSR_P_SENTSTALL) { | |
550a7375 FB |
767 | csr |= MUSB_RXCSR_P_WZC_BITS; |
768 | csr &= ~MUSB_RXCSR_P_SENTSTALL; | |
769 | musb_writew(epio, MUSB_RXCSR, csr); | |
cea83241 | 770 | return; |
550a7375 FB |
771 | } |
772 | ||
773 | if (csr & MUSB_RXCSR_P_OVERRUN) { | |
774 | /* csr |= MUSB_RXCSR_P_WZC_BITS; */ | |
775 | csr &= ~MUSB_RXCSR_P_OVERRUN; | |
776 | musb_writew(epio, MUSB_RXCSR, csr); | |
777 | ||
778 | DBG(3, "%s iso overrun on %p\n", musb_ep->name, request); | |
779 | if (request && request->status == -EINPROGRESS) | |
780 | request->status = -EOVERFLOW; | |
781 | } | |
782 | if (csr & MUSB_RXCSR_INCOMPRX) { | |
783 | /* REVISIT not necessarily an error */ | |
784 | DBG(4, "%s, incomprx\n", musb_ep->end_point.name); | |
785 | } | |
786 | ||
787 | if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { | |
788 | /* "should not happen"; likely RXPKTRDY pending for DMA */ | |
789 | DBG((csr & MUSB_RXCSR_DMAENAB) ? 4 : 1, | |
790 | "%s busy, csr %04x\n", | |
791 | musb_ep->end_point.name, csr); | |
cea83241 | 792 | return; |
550a7375 FB |
793 | } |
794 | ||
795 | if (dma && (csr & MUSB_RXCSR_DMAENAB)) { | |
796 | csr &= ~(MUSB_RXCSR_AUTOCLEAR | |
797 | | MUSB_RXCSR_DMAENAB | |
798 | | MUSB_RXCSR_DMAMODE); | |
799 | musb_writew(epio, MUSB_RXCSR, | |
800 | MUSB_RXCSR_P_WZC_BITS | csr); | |
801 | ||
802 | request->actual += musb_ep->dma->actual_len; | |
803 | ||
804 | DBG(4, "RXCSR%d %04x, dma off, %04x, len %zu, req %p\n", | |
805 | epnum, csr, | |
806 | musb_readw(epio, MUSB_RXCSR), | |
807 | musb_ep->dma->actual_len, request); | |
808 | ||
809 | #if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) | |
810 | /* Autoclear doesn't clear RxPktRdy for short packets */ | |
811 | if ((dma->desired_mode == 0) | |
812 | || (dma->actual_len | |
813 | & (musb_ep->packet_sz - 1))) { | |
814 | /* ack the read! */ | |
815 | csr &= ~MUSB_RXCSR_RXPKTRDY; | |
816 | musb_writew(epio, MUSB_RXCSR, csr); | |
817 | } | |
818 | ||
819 | /* incomplete, and not short? wait for next IN packet */ | |
820 | if ((request->actual < request->length) | |
821 | && (musb_ep->dma->actual_len | |
822 | == musb_ep->packet_sz)) | |
cea83241 | 823 | return; |
550a7375 FB |
824 | #endif |
825 | musb_g_giveback(musb_ep, request, 0); | |
826 | ||
827 | request = next_request(musb_ep); | |
828 | if (!request) | |
cea83241 | 829 | return; |
550a7375 FB |
830 | } |
831 | ||
550a7375 FB |
832 | /* analyze request if the ep is hot */ |
833 | if (request) | |
834 | rxstate(musb, to_musb_request(request)); | |
835 | else | |
836 | DBG(3, "packet waiting for %s%s request\n", | |
837 | musb_ep->desc ? "" : "inactive ", | |
838 | musb_ep->end_point.name); | |
550a7375 FB |
839 | return; |
840 | } | |
841 | ||
842 | /* ------------------------------------------------------------ */ | |
843 | ||
844 | static int musb_gadget_enable(struct usb_ep *ep, | |
845 | const struct usb_endpoint_descriptor *desc) | |
846 | { | |
847 | unsigned long flags; | |
848 | struct musb_ep *musb_ep; | |
849 | struct musb_hw_ep *hw_ep; | |
850 | void __iomem *regs; | |
851 | struct musb *musb; | |
852 | void __iomem *mbase; | |
853 | u8 epnum; | |
854 | u16 csr; | |
855 | unsigned tmp; | |
856 | int status = -EINVAL; | |
857 | ||
858 | if (!ep || !desc) | |
859 | return -EINVAL; | |
860 | ||
861 | musb_ep = to_musb_ep(ep); | |
862 | hw_ep = musb_ep->hw_ep; | |
863 | regs = hw_ep->regs; | |
864 | musb = musb_ep->musb; | |
865 | mbase = musb->mregs; | |
866 | epnum = musb_ep->current_epnum; | |
867 | ||
868 | spin_lock_irqsave(&musb->lock, flags); | |
869 | ||
870 | if (musb_ep->desc) { | |
871 | status = -EBUSY; | |
872 | goto fail; | |
873 | } | |
96bcd090 | 874 | musb_ep->type = usb_endpoint_type(desc); |
550a7375 FB |
875 | |
876 | /* check direction and (later) maxpacket size against endpoint */ | |
96bcd090 | 877 | if (usb_endpoint_num(desc) != epnum) |
550a7375 FB |
878 | goto fail; |
879 | ||
880 | /* REVISIT this rules out high bandwidth periodic transfers */ | |
881 | tmp = le16_to_cpu(desc->wMaxPacketSize); | |
882 | if (tmp & ~0x07ff) | |
883 | goto fail; | |
884 | musb_ep->packet_sz = tmp; | |
885 | ||
886 | /* enable the interrupts for the endpoint, set the endpoint | |
887 | * packet size (or fail), set the mode, clear the fifo | |
888 | */ | |
889 | musb_ep_select(mbase, epnum); | |
96bcd090 | 890 | if (usb_endpoint_dir_in(desc)) { |
550a7375 FB |
891 | u16 int_txe = musb_readw(mbase, MUSB_INTRTXE); |
892 | ||
893 | if (hw_ep->is_shared_fifo) | |
894 | musb_ep->is_in = 1; | |
895 | if (!musb_ep->is_in) | |
896 | goto fail; | |
897 | if (tmp > hw_ep->max_packet_sz_tx) | |
898 | goto fail; | |
899 | ||
900 | int_txe |= (1 << epnum); | |
901 | musb_writew(mbase, MUSB_INTRTXE, int_txe); | |
902 | ||
903 | /* REVISIT if can_bulk_split(), use by updating "tmp"; | |
904 | * likewise high bandwidth periodic tx | |
905 | */ | |
906 | musb_writew(regs, MUSB_TXMAXP, tmp); | |
907 | ||
908 | csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG; | |
909 | if (musb_readw(regs, MUSB_TXCSR) | |
910 | & MUSB_TXCSR_FIFONOTEMPTY) | |
911 | csr |= MUSB_TXCSR_FLUSHFIFO; | |
912 | if (musb_ep->type == USB_ENDPOINT_XFER_ISOC) | |
913 | csr |= MUSB_TXCSR_P_ISO; | |
914 | ||
915 | /* set twice in case of double buffering */ | |
916 | musb_writew(regs, MUSB_TXCSR, csr); | |
917 | /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */ | |
918 | musb_writew(regs, MUSB_TXCSR, csr); | |
919 | ||
920 | } else { | |
921 | u16 int_rxe = musb_readw(mbase, MUSB_INTRRXE); | |
922 | ||
923 | if (hw_ep->is_shared_fifo) | |
924 | musb_ep->is_in = 0; | |
925 | if (musb_ep->is_in) | |
926 | goto fail; | |
927 | if (tmp > hw_ep->max_packet_sz_rx) | |
928 | goto fail; | |
929 | ||
930 | int_rxe |= (1 << epnum); | |
931 | musb_writew(mbase, MUSB_INTRRXE, int_rxe); | |
932 | ||
933 | /* REVISIT if can_bulk_combine() use by updating "tmp" | |
934 | * likewise high bandwidth periodic rx | |
935 | */ | |
936 | musb_writew(regs, MUSB_RXMAXP, tmp); | |
937 | ||
938 | /* force shared fifo to OUT-only mode */ | |
939 | if (hw_ep->is_shared_fifo) { | |
940 | csr = musb_readw(regs, MUSB_TXCSR); | |
941 | csr &= ~(MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY); | |
942 | musb_writew(regs, MUSB_TXCSR, csr); | |
943 | } | |
944 | ||
945 | csr = MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_CLRDATATOG; | |
946 | if (musb_ep->type == USB_ENDPOINT_XFER_ISOC) | |
947 | csr |= MUSB_RXCSR_P_ISO; | |
948 | else if (musb_ep->type == USB_ENDPOINT_XFER_INT) | |
949 | csr |= MUSB_RXCSR_DISNYET; | |
950 | ||
951 | /* set twice in case of double buffering */ | |
952 | musb_writew(regs, MUSB_RXCSR, csr); | |
953 | musb_writew(regs, MUSB_RXCSR, csr); | |
954 | } | |
955 | ||
956 | /* NOTE: all the I/O code _should_ work fine without DMA, in case | |
957 | * for some reason you run out of channels here. | |
958 | */ | |
959 | if (is_dma_capable() && musb->dma_controller) { | |
960 | struct dma_controller *c = musb->dma_controller; | |
961 | ||
962 | musb_ep->dma = c->channel_alloc(c, hw_ep, | |
963 | (desc->bEndpointAddress & USB_DIR_IN)); | |
964 | } else | |
965 | musb_ep->dma = NULL; | |
966 | ||
967 | musb_ep->desc = desc; | |
968 | musb_ep->busy = 0; | |
969 | status = 0; | |
970 | ||
971 | pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n", | |
972 | musb_driver_name, musb_ep->end_point.name, | |
973 | ({ char *s; switch (musb_ep->type) { | |
974 | case USB_ENDPOINT_XFER_BULK: s = "bulk"; break; | |
975 | case USB_ENDPOINT_XFER_INT: s = "int"; break; | |
976 | default: s = "iso"; break; | |
977 | }; s; }), | |
978 | musb_ep->is_in ? "IN" : "OUT", | |
979 | musb_ep->dma ? "dma, " : "", | |
980 | musb_ep->packet_sz); | |
981 | ||
982 | schedule_work(&musb->irq_work); | |
983 | ||
984 | fail: | |
985 | spin_unlock_irqrestore(&musb->lock, flags); | |
986 | return status; | |
987 | } | |
988 | ||
989 | /* | |
990 | * Disable an endpoint flushing all requests queued. | |
991 | */ | |
992 | static int musb_gadget_disable(struct usb_ep *ep) | |
993 | { | |
994 | unsigned long flags; | |
995 | struct musb *musb; | |
996 | u8 epnum; | |
997 | struct musb_ep *musb_ep; | |
998 | void __iomem *epio; | |
999 | int status = 0; | |
1000 | ||
1001 | musb_ep = to_musb_ep(ep); | |
1002 | musb = musb_ep->musb; | |
1003 | epnum = musb_ep->current_epnum; | |
1004 | epio = musb->endpoints[epnum].regs; | |
1005 | ||
1006 | spin_lock_irqsave(&musb->lock, flags); | |
1007 | musb_ep_select(musb->mregs, epnum); | |
1008 | ||
1009 | /* zero the endpoint sizes */ | |
1010 | if (musb_ep->is_in) { | |
1011 | u16 int_txe = musb_readw(musb->mregs, MUSB_INTRTXE); | |
1012 | int_txe &= ~(1 << epnum); | |
1013 | musb_writew(musb->mregs, MUSB_INTRTXE, int_txe); | |
1014 | musb_writew(epio, MUSB_TXMAXP, 0); | |
1015 | } else { | |
1016 | u16 int_rxe = musb_readw(musb->mregs, MUSB_INTRRXE); | |
1017 | int_rxe &= ~(1 << epnum); | |
1018 | musb_writew(musb->mregs, MUSB_INTRRXE, int_rxe); | |
1019 | musb_writew(epio, MUSB_RXMAXP, 0); | |
1020 | } | |
1021 | ||
1022 | musb_ep->desc = NULL; | |
1023 | ||
1024 | /* abort all pending DMA and requests */ | |
1025 | nuke(musb_ep, -ESHUTDOWN); | |
1026 | ||
1027 | schedule_work(&musb->irq_work); | |
1028 | ||
1029 | spin_unlock_irqrestore(&(musb->lock), flags); | |
1030 | ||
1031 | DBG(2, "%s\n", musb_ep->end_point.name); | |
1032 | ||
1033 | return status; | |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * Allocate a request for an endpoint. | |
1038 | * Reused by ep0 code. | |
1039 | */ | |
1040 | struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) | |
1041 | { | |
1042 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
1043 | struct musb_request *request = NULL; | |
1044 | ||
1045 | request = kzalloc(sizeof *request, gfp_flags); | |
1046 | if (request) { | |
1047 | INIT_LIST_HEAD(&request->request.list); | |
1048 | request->request.dma = DMA_ADDR_INVALID; | |
1049 | request->epnum = musb_ep->current_epnum; | |
1050 | request->ep = musb_ep; | |
1051 | } | |
1052 | ||
1053 | return &request->request; | |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * Free a request | |
1058 | * Reused by ep0 code. | |
1059 | */ | |
1060 | void musb_free_request(struct usb_ep *ep, struct usb_request *req) | |
1061 | { | |
1062 | kfree(to_musb_request(req)); | |
1063 | } | |
1064 | ||
1065 | static LIST_HEAD(buffers); | |
1066 | ||
1067 | struct free_record { | |
1068 | struct list_head list; | |
1069 | struct device *dev; | |
1070 | unsigned bytes; | |
1071 | dma_addr_t dma; | |
1072 | }; | |
1073 | ||
1074 | /* | |
1075 | * Context: controller locked, IRQs blocked. | |
1076 | */ | |
1077 | static void musb_ep_restart(struct musb *musb, struct musb_request *req) | |
1078 | { | |
1079 | DBG(3, "<== %s request %p len %u on hw_ep%d\n", | |
1080 | req->tx ? "TX/IN" : "RX/OUT", | |
1081 | &req->request, req->request.length, req->epnum); | |
1082 | ||
1083 | musb_ep_select(musb->mregs, req->epnum); | |
1084 | if (req->tx) | |
1085 | txstate(musb, req); | |
1086 | else | |
1087 | rxstate(musb, req); | |
1088 | } | |
1089 | ||
1090 | static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req, | |
1091 | gfp_t gfp_flags) | |
1092 | { | |
1093 | struct musb_ep *musb_ep; | |
1094 | struct musb_request *request; | |
1095 | struct musb *musb; | |
1096 | int status = 0; | |
1097 | unsigned long lockflags; | |
1098 | ||
1099 | if (!ep || !req) | |
1100 | return -EINVAL; | |
1101 | if (!req->buf) | |
1102 | return -ENODATA; | |
1103 | ||
1104 | musb_ep = to_musb_ep(ep); | |
1105 | musb = musb_ep->musb; | |
1106 | ||
1107 | request = to_musb_request(req); | |
1108 | request->musb = musb; | |
1109 | ||
1110 | if (request->ep != musb_ep) | |
1111 | return -EINVAL; | |
1112 | ||
1113 | DBG(4, "<== to %s request=%p\n", ep->name, req); | |
1114 | ||
1115 | /* request is mine now... */ | |
1116 | request->request.actual = 0; | |
1117 | request->request.status = -EINPROGRESS; | |
1118 | request->epnum = musb_ep->current_epnum; | |
1119 | request->tx = musb_ep->is_in; | |
1120 | ||
1121 | if (is_dma_capable() && musb_ep->dma) { | |
1122 | if (request->request.dma == DMA_ADDR_INVALID) { | |
1123 | request->request.dma = dma_map_single( | |
1124 | musb->controller, | |
1125 | request->request.buf, | |
1126 | request->request.length, | |
1127 | request->tx | |
1128 | ? DMA_TO_DEVICE | |
1129 | : DMA_FROM_DEVICE); | |
1130 | request->mapped = 1; | |
1131 | } else { | |
1132 | dma_sync_single_for_device(musb->controller, | |
1133 | request->request.dma, | |
1134 | request->request.length, | |
1135 | request->tx | |
1136 | ? DMA_TO_DEVICE | |
1137 | : DMA_FROM_DEVICE); | |
1138 | request->mapped = 0; | |
1139 | } | |
1140 | } else if (!req->buf) { | |
1141 | return -ENODATA; | |
1142 | } else | |
1143 | request->mapped = 0; | |
1144 | ||
1145 | spin_lock_irqsave(&musb->lock, lockflags); | |
1146 | ||
1147 | /* don't queue if the ep is down */ | |
1148 | if (!musb_ep->desc) { | |
1149 | DBG(4, "req %p queued to %s while ep %s\n", | |
1150 | req, ep->name, "disabled"); | |
1151 | status = -ESHUTDOWN; | |
1152 | goto cleanup; | |
1153 | } | |
1154 | ||
1155 | /* add request to the list */ | |
1156 | list_add_tail(&(request->request.list), &(musb_ep->req_list)); | |
1157 | ||
1158 | /* it this is the head of the queue, start i/o ... */ | |
1159 | if (!musb_ep->busy && &request->request.list == musb_ep->req_list.next) | |
1160 | musb_ep_restart(musb, request); | |
1161 | ||
1162 | cleanup: | |
1163 | spin_unlock_irqrestore(&musb->lock, lockflags); | |
1164 | return status; | |
1165 | } | |
1166 | ||
1167 | static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request *request) | |
1168 | { | |
1169 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
1170 | struct usb_request *r; | |
1171 | unsigned long flags; | |
1172 | int status = 0; | |
1173 | struct musb *musb = musb_ep->musb; | |
1174 | ||
1175 | if (!ep || !request || to_musb_request(request)->ep != musb_ep) | |
1176 | return -EINVAL; | |
1177 | ||
1178 | spin_lock_irqsave(&musb->lock, flags); | |
1179 | ||
1180 | list_for_each_entry(r, &musb_ep->req_list, list) { | |
1181 | if (r == request) | |
1182 | break; | |
1183 | } | |
1184 | if (r != request) { | |
1185 | DBG(3, "request %p not queued to %s\n", request, ep->name); | |
1186 | status = -EINVAL; | |
1187 | goto done; | |
1188 | } | |
1189 | ||
1190 | /* if the hardware doesn't have the request, easy ... */ | |
1191 | if (musb_ep->req_list.next != &request->list || musb_ep->busy) | |
1192 | musb_g_giveback(musb_ep, request, -ECONNRESET); | |
1193 | ||
1194 | /* ... else abort the dma transfer ... */ | |
1195 | else if (is_dma_capable() && musb_ep->dma) { | |
1196 | struct dma_controller *c = musb->dma_controller; | |
1197 | ||
1198 | musb_ep_select(musb->mregs, musb_ep->current_epnum); | |
1199 | if (c->channel_abort) | |
1200 | status = c->channel_abort(musb_ep->dma); | |
1201 | else | |
1202 | status = -EBUSY; | |
1203 | if (status == 0) | |
1204 | musb_g_giveback(musb_ep, request, -ECONNRESET); | |
1205 | } else { | |
1206 | /* NOTE: by sticking to easily tested hardware/driver states, | |
1207 | * we leave counting of in-flight packets imprecise. | |
1208 | */ | |
1209 | musb_g_giveback(musb_ep, request, -ECONNRESET); | |
1210 | } | |
1211 | ||
1212 | done: | |
1213 | spin_unlock_irqrestore(&musb->lock, flags); | |
1214 | return status; | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * Set or clear the halt bit of an endpoint. A halted enpoint won't tx/rx any | |
1219 | * data but will queue requests. | |
1220 | * | |
1221 | * exported to ep0 code | |
1222 | */ | |
1223 | int musb_gadget_set_halt(struct usb_ep *ep, int value) | |
1224 | { | |
1225 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
1226 | u8 epnum = musb_ep->current_epnum; | |
1227 | struct musb *musb = musb_ep->musb; | |
1228 | void __iomem *epio = musb->endpoints[epnum].regs; | |
1229 | void __iomem *mbase; | |
1230 | unsigned long flags; | |
1231 | u16 csr; | |
cea83241 | 1232 | struct musb_request *request; |
550a7375 FB |
1233 | int status = 0; |
1234 | ||
1235 | if (!ep) | |
1236 | return -EINVAL; | |
1237 | mbase = musb->mregs; | |
1238 | ||
1239 | spin_lock_irqsave(&musb->lock, flags); | |
1240 | ||
1241 | if ((USB_ENDPOINT_XFER_ISOC == musb_ep->type)) { | |
1242 | status = -EINVAL; | |
1243 | goto done; | |
1244 | } | |
1245 | ||
1246 | musb_ep_select(mbase, epnum); | |
1247 | ||
550a7375 | 1248 | request = to_musb_request(next_request(musb_ep)); |
cea83241 SS |
1249 | if (value) { |
1250 | if (request) { | |
1251 | DBG(3, "request in progress, cannot halt %s\n", | |
1252 | ep->name); | |
1253 | status = -EAGAIN; | |
1254 | goto done; | |
1255 | } | |
1256 | /* Cannot portably stall with non-empty FIFO */ | |
1257 | if (musb_ep->is_in) { | |
1258 | csr = musb_readw(epio, MUSB_TXCSR); | |
1259 | if (csr & MUSB_TXCSR_FIFONOTEMPTY) { | |
1260 | DBG(3, "FIFO busy, cannot halt %s\n", ep->name); | |
1261 | status = -EAGAIN; | |
1262 | goto done; | |
1263 | } | |
550a7375 | 1264 | } |
550a7375 FB |
1265 | } |
1266 | ||
1267 | /* set/clear the stall and toggle bits */ | |
1268 | DBG(2, "%s: %s stall\n", ep->name, value ? "set" : "clear"); | |
1269 | if (musb_ep->is_in) { | |
1270 | csr = musb_readw(epio, MUSB_TXCSR); | |
550a7375 FB |
1271 | csr |= MUSB_TXCSR_P_WZC_BITS |
1272 | | MUSB_TXCSR_CLRDATATOG; | |
1273 | if (value) | |
1274 | csr |= MUSB_TXCSR_P_SENDSTALL; | |
1275 | else | |
1276 | csr &= ~(MUSB_TXCSR_P_SENDSTALL | |
1277 | | MUSB_TXCSR_P_SENTSTALL); | |
1278 | csr &= ~MUSB_TXCSR_TXPKTRDY; | |
1279 | musb_writew(epio, MUSB_TXCSR, csr); | |
1280 | } else { | |
1281 | csr = musb_readw(epio, MUSB_RXCSR); | |
1282 | csr |= MUSB_RXCSR_P_WZC_BITS | |
1283 | | MUSB_RXCSR_FLUSHFIFO | |
1284 | | MUSB_RXCSR_CLRDATATOG; | |
1285 | if (value) | |
1286 | csr |= MUSB_RXCSR_P_SENDSTALL; | |
1287 | else | |
1288 | csr &= ~(MUSB_RXCSR_P_SENDSTALL | |
1289 | | MUSB_RXCSR_P_SENTSTALL); | |
1290 | musb_writew(epio, MUSB_RXCSR, csr); | |
1291 | } | |
1292 | ||
550a7375 FB |
1293 | /* maybe start the first request in the queue */ |
1294 | if (!musb_ep->busy && !value && request) { | |
1295 | DBG(3, "restarting the request\n"); | |
1296 | musb_ep_restart(musb, request); | |
1297 | } | |
1298 | ||
cea83241 | 1299 | done: |
550a7375 FB |
1300 | spin_unlock_irqrestore(&musb->lock, flags); |
1301 | return status; | |
1302 | } | |
1303 | ||
1304 | static int musb_gadget_fifo_status(struct usb_ep *ep) | |
1305 | { | |
1306 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
1307 | void __iomem *epio = musb_ep->hw_ep->regs; | |
1308 | int retval = -EINVAL; | |
1309 | ||
1310 | if (musb_ep->desc && !musb_ep->is_in) { | |
1311 | struct musb *musb = musb_ep->musb; | |
1312 | int epnum = musb_ep->current_epnum; | |
1313 | void __iomem *mbase = musb->mregs; | |
1314 | unsigned long flags; | |
1315 | ||
1316 | spin_lock_irqsave(&musb->lock, flags); | |
1317 | ||
1318 | musb_ep_select(mbase, epnum); | |
1319 | /* FIXME return zero unless RXPKTRDY is set */ | |
1320 | retval = musb_readw(epio, MUSB_RXCOUNT); | |
1321 | ||
1322 | spin_unlock_irqrestore(&musb->lock, flags); | |
1323 | } | |
1324 | return retval; | |
1325 | } | |
1326 | ||
1327 | static void musb_gadget_fifo_flush(struct usb_ep *ep) | |
1328 | { | |
1329 | struct musb_ep *musb_ep = to_musb_ep(ep); | |
1330 | struct musb *musb = musb_ep->musb; | |
1331 | u8 epnum = musb_ep->current_epnum; | |
1332 | void __iomem *epio = musb->endpoints[epnum].regs; | |
1333 | void __iomem *mbase; | |
1334 | unsigned long flags; | |
1335 | u16 csr, int_txe; | |
1336 | ||
1337 | mbase = musb->mregs; | |
1338 | ||
1339 | spin_lock_irqsave(&musb->lock, flags); | |
1340 | musb_ep_select(mbase, (u8) epnum); | |
1341 | ||
1342 | /* disable interrupts */ | |
1343 | int_txe = musb_readw(mbase, MUSB_INTRTXE); | |
1344 | musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum)); | |
1345 | ||
1346 | if (musb_ep->is_in) { | |
1347 | csr = musb_readw(epio, MUSB_TXCSR); | |
1348 | if (csr & MUSB_TXCSR_FIFONOTEMPTY) { | |
1349 | csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_P_WZC_BITS; | |
1350 | musb_writew(epio, MUSB_TXCSR, csr); | |
1351 | /* REVISIT may be inappropriate w/o FIFONOTEMPTY ... */ | |
1352 | musb_writew(epio, MUSB_TXCSR, csr); | |
1353 | } | |
1354 | } else { | |
1355 | csr = musb_readw(epio, MUSB_RXCSR); | |
1356 | csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_P_WZC_BITS; | |
1357 | musb_writew(epio, MUSB_RXCSR, csr); | |
1358 | musb_writew(epio, MUSB_RXCSR, csr); | |
1359 | } | |
1360 | ||
1361 | /* re-enable interrupt */ | |
1362 | musb_writew(mbase, MUSB_INTRTXE, int_txe); | |
1363 | spin_unlock_irqrestore(&musb->lock, flags); | |
1364 | } | |
1365 | ||
1366 | static const struct usb_ep_ops musb_ep_ops = { | |
1367 | .enable = musb_gadget_enable, | |
1368 | .disable = musb_gadget_disable, | |
1369 | .alloc_request = musb_alloc_request, | |
1370 | .free_request = musb_free_request, | |
1371 | .queue = musb_gadget_queue, | |
1372 | .dequeue = musb_gadget_dequeue, | |
1373 | .set_halt = musb_gadget_set_halt, | |
1374 | .fifo_status = musb_gadget_fifo_status, | |
1375 | .fifo_flush = musb_gadget_fifo_flush | |
1376 | }; | |
1377 | ||
1378 | /* ----------------------------------------------------------------------- */ | |
1379 | ||
1380 | static int musb_gadget_get_frame(struct usb_gadget *gadget) | |
1381 | { | |
1382 | struct musb *musb = gadget_to_musb(gadget); | |
1383 | ||
1384 | return (int)musb_readw(musb->mregs, MUSB_FRAME); | |
1385 | } | |
1386 | ||
1387 | static int musb_gadget_wakeup(struct usb_gadget *gadget) | |
1388 | { | |
1389 | struct musb *musb = gadget_to_musb(gadget); | |
1390 | void __iomem *mregs = musb->mregs; | |
1391 | unsigned long flags; | |
1392 | int status = -EINVAL; | |
1393 | u8 power, devctl; | |
1394 | int retries; | |
1395 | ||
1396 | spin_lock_irqsave(&musb->lock, flags); | |
1397 | ||
84e250ff | 1398 | switch (musb->xceiv->state) { |
550a7375 FB |
1399 | case OTG_STATE_B_PERIPHERAL: |
1400 | /* NOTE: OTG state machine doesn't include B_SUSPENDED; | |
1401 | * that's part of the standard usb 1.1 state machine, and | |
1402 | * doesn't affect OTG transitions. | |
1403 | */ | |
1404 | if (musb->may_wakeup && musb->is_suspended) | |
1405 | break; | |
1406 | goto done; | |
1407 | case OTG_STATE_B_IDLE: | |
1408 | /* Start SRP ... OTG not required. */ | |
1409 | devctl = musb_readb(mregs, MUSB_DEVCTL); | |
1410 | DBG(2, "Sending SRP: devctl: %02x\n", devctl); | |
1411 | devctl |= MUSB_DEVCTL_SESSION; | |
1412 | musb_writeb(mregs, MUSB_DEVCTL, devctl); | |
1413 | devctl = musb_readb(mregs, MUSB_DEVCTL); | |
1414 | retries = 100; | |
1415 | while (!(devctl & MUSB_DEVCTL_SESSION)) { | |
1416 | devctl = musb_readb(mregs, MUSB_DEVCTL); | |
1417 | if (retries-- < 1) | |
1418 | break; | |
1419 | } | |
1420 | retries = 10000; | |
1421 | while (devctl & MUSB_DEVCTL_SESSION) { | |
1422 | devctl = musb_readb(mregs, MUSB_DEVCTL); | |
1423 | if (retries-- < 1) | |
1424 | break; | |
1425 | } | |
1426 | ||
1427 | /* Block idling for at least 1s */ | |
1428 | musb_platform_try_idle(musb, | |
1429 | jiffies + msecs_to_jiffies(1 * HZ)); | |
1430 | ||
1431 | status = 0; | |
1432 | goto done; | |
1433 | default: | |
1434 | DBG(2, "Unhandled wake: %s\n", otg_state_string(musb)); | |
1435 | goto done; | |
1436 | } | |
1437 | ||
1438 | status = 0; | |
1439 | ||
1440 | power = musb_readb(mregs, MUSB_POWER); | |
1441 | power |= MUSB_POWER_RESUME; | |
1442 | musb_writeb(mregs, MUSB_POWER, power); | |
1443 | DBG(2, "issue wakeup\n"); | |
1444 | ||
1445 | /* FIXME do this next chunk in a timer callback, no udelay */ | |
1446 | mdelay(2); | |
1447 | ||
1448 | power = musb_readb(mregs, MUSB_POWER); | |
1449 | power &= ~MUSB_POWER_RESUME; | |
1450 | musb_writeb(mregs, MUSB_POWER, power); | |
1451 | done: | |
1452 | spin_unlock_irqrestore(&musb->lock, flags); | |
1453 | return status; | |
1454 | } | |
1455 | ||
1456 | static int | |
1457 | musb_gadget_set_self_powered(struct usb_gadget *gadget, int is_selfpowered) | |
1458 | { | |
1459 | struct musb *musb = gadget_to_musb(gadget); | |
1460 | ||
1461 | musb->is_self_powered = !!is_selfpowered; | |
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | static void musb_pullup(struct musb *musb, int is_on) | |
1466 | { | |
1467 | u8 power; | |
1468 | ||
1469 | power = musb_readb(musb->mregs, MUSB_POWER); | |
1470 | if (is_on) | |
1471 | power |= MUSB_POWER_SOFTCONN; | |
1472 | else | |
1473 | power &= ~MUSB_POWER_SOFTCONN; | |
1474 | ||
1475 | /* FIXME if on, HdrcStart; if off, HdrcStop */ | |
1476 | ||
1477 | DBG(3, "gadget %s D+ pullup %s\n", | |
1478 | musb->gadget_driver->function, is_on ? "on" : "off"); | |
1479 | musb_writeb(musb->mregs, MUSB_POWER, power); | |
1480 | } | |
1481 | ||
1482 | #if 0 | |
1483 | static int musb_gadget_vbus_session(struct usb_gadget *gadget, int is_active) | |
1484 | { | |
1485 | DBG(2, "<= %s =>\n", __func__); | |
1486 | ||
1487 | /* | |
1488 | * FIXME iff driver's softconnect flag is set (as it is during probe, | |
1489 | * though that can clear it), just musb_pullup(). | |
1490 | */ | |
1491 | ||
1492 | return -EINVAL; | |
1493 | } | |
1494 | #endif | |
1495 | ||
1496 | static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA) | |
1497 | { | |
1498 | struct musb *musb = gadget_to_musb(gadget); | |
1499 | ||
84e250ff | 1500 | if (!musb->xceiv->set_power) |
550a7375 | 1501 | return -EOPNOTSUPP; |
84e250ff | 1502 | return otg_set_power(musb->xceiv, mA); |
550a7375 FB |
1503 | } |
1504 | ||
1505 | static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on) | |
1506 | { | |
1507 | struct musb *musb = gadget_to_musb(gadget); | |
1508 | unsigned long flags; | |
1509 | ||
1510 | is_on = !!is_on; | |
1511 | ||
1512 | /* NOTE: this assumes we are sensing vbus; we'd rather | |
1513 | * not pullup unless the B-session is active. | |
1514 | */ | |
1515 | spin_lock_irqsave(&musb->lock, flags); | |
1516 | if (is_on != musb->softconnect) { | |
1517 | musb->softconnect = is_on; | |
1518 | musb_pullup(musb, is_on); | |
1519 | } | |
1520 | spin_unlock_irqrestore(&musb->lock, flags); | |
1521 | return 0; | |
1522 | } | |
1523 | ||
1524 | static const struct usb_gadget_ops musb_gadget_operations = { | |
1525 | .get_frame = musb_gadget_get_frame, | |
1526 | .wakeup = musb_gadget_wakeup, | |
1527 | .set_selfpowered = musb_gadget_set_self_powered, | |
1528 | /* .vbus_session = musb_gadget_vbus_session, */ | |
1529 | .vbus_draw = musb_gadget_vbus_draw, | |
1530 | .pullup = musb_gadget_pullup, | |
1531 | }; | |
1532 | ||
1533 | /* ----------------------------------------------------------------------- */ | |
1534 | ||
1535 | /* Registration */ | |
1536 | ||
1537 | /* Only this registration code "knows" the rule (from USB standards) | |
1538 | * about there being only one external upstream port. It assumes | |
1539 | * all peripheral ports are external... | |
1540 | */ | |
1541 | static struct musb *the_gadget; | |
1542 | ||
1543 | static void musb_gadget_release(struct device *dev) | |
1544 | { | |
1545 | /* kref_put(WHAT) */ | |
1546 | dev_dbg(dev, "%s\n", __func__); | |
1547 | } | |
1548 | ||
1549 | ||
1550 | static void __init | |
1551 | init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in) | |
1552 | { | |
1553 | struct musb_hw_ep *hw_ep = musb->endpoints + epnum; | |
1554 | ||
1555 | memset(ep, 0, sizeof *ep); | |
1556 | ||
1557 | ep->current_epnum = epnum; | |
1558 | ep->musb = musb; | |
1559 | ep->hw_ep = hw_ep; | |
1560 | ep->is_in = is_in; | |
1561 | ||
1562 | INIT_LIST_HEAD(&ep->req_list); | |
1563 | ||
1564 | sprintf(ep->name, "ep%d%s", epnum, | |
1565 | (!epnum || hw_ep->is_shared_fifo) ? "" : ( | |
1566 | is_in ? "in" : "out")); | |
1567 | ep->end_point.name = ep->name; | |
1568 | INIT_LIST_HEAD(&ep->end_point.ep_list); | |
1569 | if (!epnum) { | |
1570 | ep->end_point.maxpacket = 64; | |
1571 | ep->end_point.ops = &musb_g_ep0_ops; | |
1572 | musb->g.ep0 = &ep->end_point; | |
1573 | } else { | |
1574 | if (is_in) | |
1575 | ep->end_point.maxpacket = hw_ep->max_packet_sz_tx; | |
1576 | else | |
1577 | ep->end_point.maxpacket = hw_ep->max_packet_sz_rx; | |
1578 | ep->end_point.ops = &musb_ep_ops; | |
1579 | list_add_tail(&ep->end_point.ep_list, &musb->g.ep_list); | |
1580 | } | |
1581 | } | |
1582 | ||
1583 | /* | |
1584 | * Initialize the endpoints exposed to peripheral drivers, with backlinks | |
1585 | * to the rest of the driver state. | |
1586 | */ | |
1587 | static inline void __init musb_g_init_endpoints(struct musb *musb) | |
1588 | { | |
1589 | u8 epnum; | |
1590 | struct musb_hw_ep *hw_ep; | |
1591 | unsigned count = 0; | |
1592 | ||
1593 | /* intialize endpoint list just once */ | |
1594 | INIT_LIST_HEAD(&(musb->g.ep_list)); | |
1595 | ||
1596 | for (epnum = 0, hw_ep = musb->endpoints; | |
1597 | epnum < musb->nr_endpoints; | |
1598 | epnum++, hw_ep++) { | |
1599 | if (hw_ep->is_shared_fifo /* || !epnum */) { | |
1600 | init_peripheral_ep(musb, &hw_ep->ep_in, epnum, 0); | |
1601 | count++; | |
1602 | } else { | |
1603 | if (hw_ep->max_packet_sz_tx) { | |
1604 | init_peripheral_ep(musb, &hw_ep->ep_in, | |
1605 | epnum, 1); | |
1606 | count++; | |
1607 | } | |
1608 | if (hw_ep->max_packet_sz_rx) { | |
1609 | init_peripheral_ep(musb, &hw_ep->ep_out, | |
1610 | epnum, 0); | |
1611 | count++; | |
1612 | } | |
1613 | } | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | /* called once during driver setup to initialize and link into | |
1618 | * the driver model; memory is zeroed. | |
1619 | */ | |
1620 | int __init musb_gadget_setup(struct musb *musb) | |
1621 | { | |
1622 | int status; | |
1623 | ||
1624 | /* REVISIT minor race: if (erroneously) setting up two | |
1625 | * musb peripherals at the same time, only the bus lock | |
1626 | * is probably held. | |
1627 | */ | |
1628 | if (the_gadget) | |
1629 | return -EBUSY; | |
1630 | the_gadget = musb; | |
1631 | ||
1632 | musb->g.ops = &musb_gadget_operations; | |
1633 | musb->g.is_dualspeed = 1; | |
1634 | musb->g.speed = USB_SPEED_UNKNOWN; | |
1635 | ||
1636 | /* this "gadget" abstracts/virtualizes the controller */ | |
427c4f33 | 1637 | dev_set_name(&musb->g.dev, "gadget"); |
550a7375 FB |
1638 | musb->g.dev.parent = musb->controller; |
1639 | musb->g.dev.dma_mask = musb->controller->dma_mask; | |
1640 | musb->g.dev.release = musb_gadget_release; | |
1641 | musb->g.name = musb_driver_name; | |
1642 | ||
1643 | if (is_otg_enabled(musb)) | |
1644 | musb->g.is_otg = 1; | |
1645 | ||
1646 | musb_g_init_endpoints(musb); | |
1647 | ||
1648 | musb->is_active = 0; | |
1649 | musb_platform_try_idle(musb, 0); | |
1650 | ||
1651 | status = device_register(&musb->g.dev); | |
1652 | if (status != 0) | |
1653 | the_gadget = NULL; | |
1654 | return status; | |
1655 | } | |
1656 | ||
1657 | void musb_gadget_cleanup(struct musb *musb) | |
1658 | { | |
1659 | if (musb != the_gadget) | |
1660 | return; | |
1661 | ||
1662 | device_unregister(&musb->g.dev); | |
1663 | the_gadget = NULL; | |
1664 | } | |
1665 | ||
1666 | /* | |
1667 | * Register the gadget driver. Used by gadget drivers when | |
1668 | * registering themselves with the controller. | |
1669 | * | |
1670 | * -EINVAL something went wrong (not driver) | |
1671 | * -EBUSY another gadget is already using the controller | |
1672 | * -ENOMEM no memeory to perform the operation | |
1673 | * | |
1674 | * @param driver the gadget driver | |
1675 | * @return <0 if error, 0 if everything is fine | |
1676 | */ | |
1677 | int usb_gadget_register_driver(struct usb_gadget_driver *driver) | |
1678 | { | |
1679 | int retval; | |
1680 | unsigned long flags; | |
1681 | struct musb *musb = the_gadget; | |
1682 | ||
1683 | if (!driver | |
1684 | || driver->speed != USB_SPEED_HIGH | |
1685 | || !driver->bind | |
1686 | || !driver->setup) | |
1687 | return -EINVAL; | |
1688 | ||
1689 | /* driver must be initialized to support peripheral mode */ | |
1690 | if (!musb || !(musb->board_mode == MUSB_OTG | |
1691 | || musb->board_mode != MUSB_OTG)) { | |
1692 | DBG(1, "%s, no dev??\n", __func__); | |
1693 | return -ENODEV; | |
1694 | } | |
1695 | ||
1696 | DBG(3, "registering driver %s\n", driver->function); | |
1697 | spin_lock_irqsave(&musb->lock, flags); | |
1698 | ||
1699 | if (musb->gadget_driver) { | |
1700 | DBG(1, "%s is already bound to %s\n", | |
1701 | musb_driver_name, | |
1702 | musb->gadget_driver->driver.name); | |
1703 | retval = -EBUSY; | |
1704 | } else { | |
1705 | musb->gadget_driver = driver; | |
1706 | musb->g.dev.driver = &driver->driver; | |
1707 | driver->driver.bus = NULL; | |
1708 | musb->softconnect = 1; | |
1709 | retval = 0; | |
1710 | } | |
1711 | ||
1712 | spin_unlock_irqrestore(&musb->lock, flags); | |
1713 | ||
f362a475 | 1714 | if (retval == 0) { |
550a7375 | 1715 | retval = driver->bind(&musb->g); |
f362a475 FB |
1716 | if (retval != 0) { |
1717 | DBG(3, "bind to driver %s failed --> %d\n", | |
1718 | driver->driver.name, retval); | |
1719 | musb->gadget_driver = NULL; | |
1720 | musb->g.dev.driver = NULL; | |
1721 | } | |
550a7375 | 1722 | |
550a7375 FB |
1723 | spin_lock_irqsave(&musb->lock, flags); |
1724 | ||
84e250ff | 1725 | otg_set_peripheral(musb->xceiv, &musb->g); |
550a7375 FB |
1726 | musb->is_active = 1; |
1727 | ||
1728 | /* FIXME this ignores the softconnect flag. Drivers are | |
1729 | * allowed hold the peripheral inactive until for example | |
1730 | * userspace hooks up printer hardware or DSP codecs, so | |
1731 | * hosts only see fully functional devices. | |
1732 | */ | |
1733 | ||
1734 | if (!is_otg_enabled(musb)) | |
1735 | musb_start(musb); | |
1736 | ||
84e250ff DB |
1737 | otg_set_peripheral(musb->xceiv, &musb->g); |
1738 | ||
550a7375 FB |
1739 | spin_unlock_irqrestore(&musb->lock, flags); |
1740 | ||
1741 | if (is_otg_enabled(musb)) { | |
1742 | DBG(3, "OTG startup...\n"); | |
1743 | ||
1744 | /* REVISIT: funcall to other code, which also | |
1745 | * handles power budgeting ... this way also | |
1746 | * ensures HdrcStart is indirectly called. | |
1747 | */ | |
1748 | retval = usb_add_hcd(musb_to_hcd(musb), -1, 0); | |
1749 | if (retval < 0) { | |
1750 | DBG(1, "add_hcd failed, %d\n", retval); | |
1751 | spin_lock_irqsave(&musb->lock, flags); | |
84e250ff | 1752 | otg_set_peripheral(musb->xceiv, NULL); |
550a7375 FB |
1753 | musb->gadget_driver = NULL; |
1754 | musb->g.dev.driver = NULL; | |
1755 | spin_unlock_irqrestore(&musb->lock, flags); | |
1756 | } | |
1757 | } | |
1758 | } | |
1759 | ||
1760 | return retval; | |
1761 | } | |
1762 | EXPORT_SYMBOL(usb_gadget_register_driver); | |
1763 | ||
1764 | static void stop_activity(struct musb *musb, struct usb_gadget_driver *driver) | |
1765 | { | |
1766 | int i; | |
1767 | struct musb_hw_ep *hw_ep; | |
1768 | ||
1769 | /* don't disconnect if it's not connected */ | |
1770 | if (musb->g.speed == USB_SPEED_UNKNOWN) | |
1771 | driver = NULL; | |
1772 | else | |
1773 | musb->g.speed = USB_SPEED_UNKNOWN; | |
1774 | ||
1775 | /* deactivate the hardware */ | |
1776 | if (musb->softconnect) { | |
1777 | musb->softconnect = 0; | |
1778 | musb_pullup(musb, 0); | |
1779 | } | |
1780 | musb_stop(musb); | |
1781 | ||
1782 | /* killing any outstanding requests will quiesce the driver; | |
1783 | * then report disconnect | |
1784 | */ | |
1785 | if (driver) { | |
1786 | for (i = 0, hw_ep = musb->endpoints; | |
1787 | i < musb->nr_endpoints; | |
1788 | i++, hw_ep++) { | |
1789 | musb_ep_select(musb->mregs, i); | |
1790 | if (hw_ep->is_shared_fifo /* || !epnum */) { | |
1791 | nuke(&hw_ep->ep_in, -ESHUTDOWN); | |
1792 | } else { | |
1793 | if (hw_ep->max_packet_sz_tx) | |
1794 | nuke(&hw_ep->ep_in, -ESHUTDOWN); | |
1795 | if (hw_ep->max_packet_sz_rx) | |
1796 | nuke(&hw_ep->ep_out, -ESHUTDOWN); | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | spin_unlock(&musb->lock); | |
1801 | driver->disconnect(&musb->g); | |
1802 | spin_lock(&musb->lock); | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | /* | |
1807 | * Unregister the gadget driver. Used by gadget drivers when | |
1808 | * unregistering themselves from the controller. | |
1809 | * | |
1810 | * @param driver the gadget driver to unregister | |
1811 | */ | |
1812 | int usb_gadget_unregister_driver(struct usb_gadget_driver *driver) | |
1813 | { | |
1814 | unsigned long flags; | |
1815 | int retval = 0; | |
1816 | struct musb *musb = the_gadget; | |
1817 | ||
1818 | if (!driver || !driver->unbind || !musb) | |
1819 | return -EINVAL; | |
1820 | ||
1821 | /* REVISIT always use otg_set_peripheral() here too; | |
1822 | * this needs to shut down the OTG engine. | |
1823 | */ | |
1824 | ||
1825 | spin_lock_irqsave(&musb->lock, flags); | |
1826 | ||
1827 | #ifdef CONFIG_USB_MUSB_OTG | |
1828 | musb_hnp_stop(musb); | |
1829 | #endif | |
1830 | ||
1831 | if (musb->gadget_driver == driver) { | |
1832 | ||
1833 | (void) musb_gadget_vbus_draw(&musb->g, 0); | |
1834 | ||
84e250ff | 1835 | musb->xceiv->state = OTG_STATE_UNDEFINED; |
550a7375 | 1836 | stop_activity(musb, driver); |
84e250ff | 1837 | otg_set_peripheral(musb->xceiv, NULL); |
550a7375 FB |
1838 | |
1839 | DBG(3, "unregistering driver %s\n", driver->function); | |
1840 | spin_unlock_irqrestore(&musb->lock, flags); | |
1841 | driver->unbind(&musb->g); | |
1842 | spin_lock_irqsave(&musb->lock, flags); | |
1843 | ||
1844 | musb->gadget_driver = NULL; | |
1845 | musb->g.dev.driver = NULL; | |
1846 | ||
1847 | musb->is_active = 0; | |
1848 | musb_platform_try_idle(musb, 0); | |
1849 | } else | |
1850 | retval = -EINVAL; | |
1851 | spin_unlock_irqrestore(&musb->lock, flags); | |
1852 | ||
1853 | if (is_otg_enabled(musb) && retval == 0) { | |
1854 | usb_remove_hcd(musb_to_hcd(musb)); | |
1855 | /* FIXME we need to be able to register another | |
1856 | * gadget driver here and have everything work; | |
1857 | * that currently misbehaves. | |
1858 | */ | |
1859 | } | |
1860 | ||
1861 | return retval; | |
1862 | } | |
1863 | EXPORT_SYMBOL(usb_gadget_unregister_driver); | |
1864 | ||
1865 | ||
1866 | /* ----------------------------------------------------------------------- */ | |
1867 | ||
1868 | /* lifecycle operations called through plat_uds.c */ | |
1869 | ||
1870 | void musb_g_resume(struct musb *musb) | |
1871 | { | |
1872 | musb->is_suspended = 0; | |
84e250ff | 1873 | switch (musb->xceiv->state) { |
550a7375 FB |
1874 | case OTG_STATE_B_IDLE: |
1875 | break; | |
1876 | case OTG_STATE_B_WAIT_ACON: | |
1877 | case OTG_STATE_B_PERIPHERAL: | |
1878 | musb->is_active = 1; | |
1879 | if (musb->gadget_driver && musb->gadget_driver->resume) { | |
1880 | spin_unlock(&musb->lock); | |
1881 | musb->gadget_driver->resume(&musb->g); | |
1882 | spin_lock(&musb->lock); | |
1883 | } | |
1884 | break; | |
1885 | default: | |
1886 | WARNING("unhandled RESUME transition (%s)\n", | |
1887 | otg_state_string(musb)); | |
1888 | } | |
1889 | } | |
1890 | ||
1891 | /* called when SOF packets stop for 3+ msec */ | |
1892 | void musb_g_suspend(struct musb *musb) | |
1893 | { | |
1894 | u8 devctl; | |
1895 | ||
1896 | devctl = musb_readb(musb->mregs, MUSB_DEVCTL); | |
1897 | DBG(3, "devctl %02x\n", devctl); | |
1898 | ||
84e250ff | 1899 | switch (musb->xceiv->state) { |
550a7375 FB |
1900 | case OTG_STATE_B_IDLE: |
1901 | if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) | |
84e250ff | 1902 | musb->xceiv->state = OTG_STATE_B_PERIPHERAL; |
550a7375 FB |
1903 | break; |
1904 | case OTG_STATE_B_PERIPHERAL: | |
1905 | musb->is_suspended = 1; | |
1906 | if (musb->gadget_driver && musb->gadget_driver->suspend) { | |
1907 | spin_unlock(&musb->lock); | |
1908 | musb->gadget_driver->suspend(&musb->g); | |
1909 | spin_lock(&musb->lock); | |
1910 | } | |
1911 | break; | |
1912 | default: | |
1913 | /* REVISIT if B_HOST, clear DEVCTL.HOSTREQ; | |
1914 | * A_PERIPHERAL may need care too | |
1915 | */ | |
1916 | WARNING("unhandled SUSPEND transition (%s)\n", | |
1917 | otg_state_string(musb)); | |
1918 | } | |
1919 | } | |
1920 | ||
1921 | /* Called during SRP */ | |
1922 | void musb_g_wakeup(struct musb *musb) | |
1923 | { | |
1924 | musb_gadget_wakeup(&musb->g); | |
1925 | } | |
1926 | ||
1927 | /* called when VBUS drops below session threshold, and in other cases */ | |
1928 | void musb_g_disconnect(struct musb *musb) | |
1929 | { | |
1930 | void __iomem *mregs = musb->mregs; | |
1931 | u8 devctl = musb_readb(mregs, MUSB_DEVCTL); | |
1932 | ||
1933 | DBG(3, "devctl %02x\n", devctl); | |
1934 | ||
1935 | /* clear HR */ | |
1936 | musb_writeb(mregs, MUSB_DEVCTL, devctl & MUSB_DEVCTL_SESSION); | |
1937 | ||
1938 | /* don't draw vbus until new b-default session */ | |
1939 | (void) musb_gadget_vbus_draw(&musb->g, 0); | |
1940 | ||
1941 | musb->g.speed = USB_SPEED_UNKNOWN; | |
1942 | if (musb->gadget_driver && musb->gadget_driver->disconnect) { | |
1943 | spin_unlock(&musb->lock); | |
1944 | musb->gadget_driver->disconnect(&musb->g); | |
1945 | spin_lock(&musb->lock); | |
1946 | } | |
1947 | ||
84e250ff | 1948 | switch (musb->xceiv->state) { |
550a7375 FB |
1949 | default: |
1950 | #ifdef CONFIG_USB_MUSB_OTG | |
1951 | DBG(2, "Unhandled disconnect %s, setting a_idle\n", | |
1952 | otg_state_string(musb)); | |
84e250ff | 1953 | musb->xceiv->state = OTG_STATE_A_IDLE; |
ab983f2a | 1954 | MUSB_HST_MODE(musb); |
550a7375 FB |
1955 | break; |
1956 | case OTG_STATE_A_PERIPHERAL: | |
1de00dae | 1957 | musb->xceiv->state = OTG_STATE_A_WAIT_BCON; |
ab983f2a | 1958 | MUSB_HST_MODE(musb); |
550a7375 FB |
1959 | break; |
1960 | case OTG_STATE_B_WAIT_ACON: | |
1961 | case OTG_STATE_B_HOST: | |
1962 | #endif | |
1963 | case OTG_STATE_B_PERIPHERAL: | |
1964 | case OTG_STATE_B_IDLE: | |
84e250ff | 1965 | musb->xceiv->state = OTG_STATE_B_IDLE; |
550a7375 FB |
1966 | break; |
1967 | case OTG_STATE_B_SRP_INIT: | |
1968 | break; | |
1969 | } | |
1970 | ||
1971 | musb->is_active = 0; | |
1972 | } | |
1973 | ||
1974 | void musb_g_reset(struct musb *musb) | |
1975 | __releases(musb->lock) | |
1976 | __acquires(musb->lock) | |
1977 | { | |
1978 | void __iomem *mbase = musb->mregs; | |
1979 | u8 devctl = musb_readb(mbase, MUSB_DEVCTL); | |
1980 | u8 power; | |
1981 | ||
1982 | DBG(3, "<== %s addr=%x driver '%s'\n", | |
1983 | (devctl & MUSB_DEVCTL_BDEVICE) | |
1984 | ? "B-Device" : "A-Device", | |
1985 | musb_readb(mbase, MUSB_FADDR), | |
1986 | musb->gadget_driver | |
1987 | ? musb->gadget_driver->driver.name | |
1988 | : NULL | |
1989 | ); | |
1990 | ||
1991 | /* report disconnect, if we didn't already (flushing EP state) */ | |
1992 | if (musb->g.speed != USB_SPEED_UNKNOWN) | |
1993 | musb_g_disconnect(musb); | |
1994 | ||
1995 | /* clear HR */ | |
1996 | else if (devctl & MUSB_DEVCTL_HR) | |
1997 | musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION); | |
1998 | ||
1999 | ||
2000 | /* what speed did we negotiate? */ | |
2001 | power = musb_readb(mbase, MUSB_POWER); | |
2002 | musb->g.speed = (power & MUSB_POWER_HSMODE) | |
2003 | ? USB_SPEED_HIGH : USB_SPEED_FULL; | |
2004 | ||
2005 | /* start in USB_STATE_DEFAULT */ | |
2006 | musb->is_active = 1; | |
2007 | musb->is_suspended = 0; | |
2008 | MUSB_DEV_MODE(musb); | |
2009 | musb->address = 0; | |
2010 | musb->ep0_state = MUSB_EP0_STAGE_SETUP; | |
2011 | ||
2012 | musb->may_wakeup = 0; | |
2013 | musb->g.b_hnp_enable = 0; | |
2014 | musb->g.a_alt_hnp_support = 0; | |
2015 | musb->g.a_hnp_support = 0; | |
2016 | ||
2017 | /* Normal reset, as B-Device; | |
2018 | * or else after HNP, as A-Device | |
2019 | */ | |
2020 | if (devctl & MUSB_DEVCTL_BDEVICE) { | |
84e250ff | 2021 | musb->xceiv->state = OTG_STATE_B_PERIPHERAL; |
550a7375 FB |
2022 | musb->g.is_a_peripheral = 0; |
2023 | } else if (is_otg_enabled(musb)) { | |
84e250ff | 2024 | musb->xceiv->state = OTG_STATE_A_PERIPHERAL; |
550a7375 FB |
2025 | musb->g.is_a_peripheral = 1; |
2026 | } else | |
2027 | WARN_ON(1); | |
2028 | ||
2029 | /* start with default limits on VBUS power draw */ | |
2030 | (void) musb_gadget_vbus_draw(&musb->g, | |
2031 | is_otg_enabled(musb) ? 8 : 100); | |
2032 | } |