]>
Commit | Line | Data |
---|---|---|
83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
eb81955b IY |
2 | /* |
3 | * MUSB OTG peripheral driver ep0 handling | |
4 | * | |
5 | * Copyright 2005 Mentor Graphics Corporation | |
6 | * Copyright (C) 2005-2006 by Texas Instruments | |
7 | * Copyright (C) 2006-2007 Nokia Corporation | |
8 | * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com> | |
eb81955b IY |
9 | */ |
10 | ||
eb81955b IY |
11 | #ifndef __UBOOT__ |
12 | #include <linux/kernel.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/timer.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/interrupt.h> | |
18 | #else | |
19 | #include <common.h> | |
20 | #include "linux-compat.h" | |
3721eaf2 | 21 | #include <asm/processor.h> |
eb81955b IY |
22 | #endif |
23 | ||
24 | #include "musb_core.h" | |
25 | ||
26 | /* ep0 is always musb->endpoints[0].ep_in */ | |
27 | #define next_ep0_request(musb) next_in_request(&(musb)->endpoints[0]) | |
28 | ||
29 | /* | |
30 | * locking note: we use only the controller lock, for simpler correctness. | |
31 | * It's always held with IRQs blocked. | |
32 | * | |
33 | * It protects the ep0 request queue as well as ep0_state, not just the | |
34 | * controller and indexed registers. And that lock stays held unless it | |
35 | * needs to be dropped to allow reentering this driver ... like upcalls to | |
36 | * the gadget driver, or adjusting endpoint halt status. | |
37 | */ | |
38 | ||
39 | static char *decode_ep0stage(u8 stage) | |
40 | { | |
41 | switch (stage) { | |
42 | case MUSB_EP0_STAGE_IDLE: return "idle"; | |
43 | case MUSB_EP0_STAGE_SETUP: return "setup"; | |
44 | case MUSB_EP0_STAGE_TX: return "in"; | |
45 | case MUSB_EP0_STAGE_RX: return "out"; | |
46 | case MUSB_EP0_STAGE_ACKWAIT: return "wait"; | |
47 | case MUSB_EP0_STAGE_STATUSIN: return "in/status"; | |
48 | case MUSB_EP0_STAGE_STATUSOUT: return "out/status"; | |
49 | default: return "?"; | |
50 | } | |
51 | } | |
52 | ||
53 | /* handle a standard GET_STATUS request | |
54 | * Context: caller holds controller lock | |
55 | */ | |
56 | static int service_tx_status_request( | |
57 | struct musb *musb, | |
58 | const struct usb_ctrlrequest *ctrlrequest) | |
59 | { | |
60 | void __iomem *mbase = musb->mregs; | |
61 | int handled = 1; | |
62 | u8 result[2], epnum = 0; | |
63 | const u8 recip = ctrlrequest->bRequestType & USB_RECIP_MASK; | |
64 | ||
65 | result[1] = 0; | |
66 | ||
67 | switch (recip) { | |
68 | case USB_RECIP_DEVICE: | |
69 | result[0] = musb->is_self_powered << USB_DEVICE_SELF_POWERED; | |
70 | result[0] |= musb->may_wakeup << USB_DEVICE_REMOTE_WAKEUP; | |
71 | if (musb->g.is_otg) { | |
72 | result[0] |= musb->g.b_hnp_enable | |
73 | << USB_DEVICE_B_HNP_ENABLE; | |
74 | result[0] |= musb->g.a_alt_hnp_support | |
75 | << USB_DEVICE_A_ALT_HNP_SUPPORT; | |
76 | result[0] |= musb->g.a_hnp_support | |
77 | << USB_DEVICE_A_HNP_SUPPORT; | |
78 | } | |
79 | break; | |
80 | ||
81 | case USB_RECIP_INTERFACE: | |
82 | result[0] = 0; | |
83 | break; | |
84 | ||
85 | case USB_RECIP_ENDPOINT: { | |
86 | int is_in; | |
87 | struct musb_ep *ep; | |
88 | u16 tmp; | |
89 | void __iomem *regs; | |
90 | ||
91 | epnum = (u8) ctrlrequest->wIndex; | |
92 | if (!epnum) { | |
93 | result[0] = 0; | |
94 | break; | |
95 | } | |
96 | ||
97 | is_in = epnum & USB_DIR_IN; | |
98 | if (is_in) { | |
99 | epnum &= 0x0f; | |
100 | ep = &musb->endpoints[epnum].ep_in; | |
101 | } else { | |
102 | ep = &musb->endpoints[epnum].ep_out; | |
103 | } | |
104 | regs = musb->endpoints[epnum].regs; | |
105 | ||
106 | if (epnum >= MUSB_C_NUM_EPS || !ep->desc) { | |
107 | handled = -EINVAL; | |
108 | break; | |
109 | } | |
110 | ||
111 | musb_ep_select(mbase, epnum); | |
112 | if (is_in) | |
113 | tmp = musb_readw(regs, MUSB_TXCSR) | |
114 | & MUSB_TXCSR_P_SENDSTALL; | |
115 | else | |
116 | tmp = musb_readw(regs, MUSB_RXCSR) | |
117 | & MUSB_RXCSR_P_SENDSTALL; | |
118 | musb_ep_select(mbase, 0); | |
119 | ||
120 | result[0] = tmp ? 1 : 0; | |
121 | } break; | |
122 | ||
123 | default: | |
124 | /* class, vendor, etc ... delegate */ | |
125 | handled = 0; | |
126 | break; | |
127 | } | |
128 | ||
129 | /* fill up the fifo; caller updates csr0 */ | |
130 | if (handled > 0) { | |
131 | u16 len = le16_to_cpu(ctrlrequest->wLength); | |
132 | ||
133 | if (len > 2) | |
134 | len = 2; | |
135 | musb_write_fifo(&musb->endpoints[0], len, result); | |
136 | } | |
137 | ||
138 | return handled; | |
139 | } | |
140 | ||
141 | /* | |
142 | * handle a control-IN request, the end0 buffer contains the current request | |
143 | * that is supposed to be a standard control request. Assumes the fifo to | |
144 | * be at least 2 bytes long. | |
145 | * | |
146 | * @return 0 if the request was NOT HANDLED, | |
147 | * < 0 when error | |
148 | * > 0 when the request is processed | |
149 | * | |
150 | * Context: caller holds controller lock | |
151 | */ | |
152 | static int | |
153 | service_in_request(struct musb *musb, const struct usb_ctrlrequest *ctrlrequest) | |
154 | { | |
155 | int handled = 0; /* not handled */ | |
156 | ||
157 | if ((ctrlrequest->bRequestType & USB_TYPE_MASK) | |
158 | == USB_TYPE_STANDARD) { | |
159 | switch (ctrlrequest->bRequest) { | |
160 | case USB_REQ_GET_STATUS: | |
161 | handled = service_tx_status_request(musb, | |
162 | ctrlrequest); | |
163 | break; | |
164 | ||
165 | /* case USB_REQ_SYNC_FRAME: */ | |
166 | ||
167 | default: | |
168 | break; | |
169 | } | |
170 | } | |
171 | return handled; | |
172 | } | |
173 | ||
174 | /* | |
175 | * Context: caller holds controller lock | |
176 | */ | |
177 | static void musb_g_ep0_giveback(struct musb *musb, struct usb_request *req) | |
178 | { | |
179 | musb_g_giveback(&musb->endpoints[0].ep_in, req, 0); | |
180 | } | |
181 | ||
182 | /* | |
183 | * Tries to start B-device HNP negotiation if enabled via sysfs | |
184 | */ | |
185 | static inline void musb_try_b_hnp_enable(struct musb *musb) | |
186 | { | |
187 | void __iomem *mbase = musb->mregs; | |
188 | u8 devctl; | |
189 | ||
190 | dev_dbg(musb->controller, "HNP: Setting HR\n"); | |
191 | devctl = musb_readb(mbase, MUSB_DEVCTL); | |
192 | musb_writeb(mbase, MUSB_DEVCTL, devctl | MUSB_DEVCTL_HR); | |
193 | } | |
194 | ||
195 | /* | |
196 | * Handle all control requests with no DATA stage, including standard | |
197 | * requests such as: | |
198 | * USB_REQ_SET_CONFIGURATION, USB_REQ_SET_INTERFACE, unrecognized | |
199 | * always delegated to the gadget driver | |
200 | * USB_REQ_SET_ADDRESS, USB_REQ_CLEAR_FEATURE, USB_REQ_SET_FEATURE | |
201 | * always handled here, except for class/vendor/... features | |
202 | * | |
203 | * Context: caller holds controller lock | |
204 | */ | |
205 | static int | |
206 | service_zero_data_request(struct musb *musb, | |
207 | struct usb_ctrlrequest *ctrlrequest) | |
208 | __releases(musb->lock) | |
209 | __acquires(musb->lock) | |
210 | { | |
211 | int handled = -EINVAL; | |
212 | void __iomem *mbase = musb->mregs; | |
213 | const u8 recip = ctrlrequest->bRequestType & USB_RECIP_MASK; | |
214 | ||
215 | /* the gadget driver handles everything except what we MUST handle */ | |
216 | if ((ctrlrequest->bRequestType & USB_TYPE_MASK) | |
217 | == USB_TYPE_STANDARD) { | |
218 | switch (ctrlrequest->bRequest) { | |
219 | case USB_REQ_SET_ADDRESS: | |
220 | /* change it after the status stage */ | |
221 | musb->set_address = true; | |
222 | musb->address = (u8) (ctrlrequest->wValue & 0x7f); | |
223 | handled = 1; | |
224 | break; | |
225 | ||
226 | case USB_REQ_CLEAR_FEATURE: | |
227 | switch (recip) { | |
228 | case USB_RECIP_DEVICE: | |
229 | if (ctrlrequest->wValue | |
230 | != USB_DEVICE_REMOTE_WAKEUP) | |
231 | break; | |
232 | musb->may_wakeup = 0; | |
233 | handled = 1; | |
234 | break; | |
235 | case USB_RECIP_INTERFACE: | |
236 | break; | |
237 | case USB_RECIP_ENDPOINT:{ | |
238 | const u8 epnum = | |
239 | ctrlrequest->wIndex & 0x0f; | |
240 | struct musb_ep *musb_ep; | |
241 | struct musb_hw_ep *ep; | |
242 | struct musb_request *request; | |
243 | void __iomem *regs; | |
244 | int is_in; | |
245 | u16 csr; | |
246 | ||
247 | if (epnum == 0 || epnum >= MUSB_C_NUM_EPS || | |
248 | ctrlrequest->wValue != USB_ENDPOINT_HALT) | |
249 | break; | |
250 | ||
251 | ep = musb->endpoints + epnum; | |
252 | regs = ep->regs; | |
253 | is_in = ctrlrequest->wIndex & USB_DIR_IN; | |
254 | if (is_in) | |
255 | musb_ep = &ep->ep_in; | |
256 | else | |
257 | musb_ep = &ep->ep_out; | |
258 | if (!musb_ep->desc) | |
259 | break; | |
260 | ||
261 | handled = 1; | |
262 | /* Ignore request if endpoint is wedged */ | |
263 | if (musb_ep->wedged) | |
264 | break; | |
265 | ||
266 | musb_ep_select(mbase, epnum); | |
267 | if (is_in) { | |
268 | csr = musb_readw(regs, MUSB_TXCSR); | |
269 | csr |= MUSB_TXCSR_CLRDATATOG | | |
270 | MUSB_TXCSR_P_WZC_BITS; | |
271 | csr &= ~(MUSB_TXCSR_P_SENDSTALL | | |
272 | MUSB_TXCSR_P_SENTSTALL | | |
273 | MUSB_TXCSR_TXPKTRDY); | |
274 | musb_writew(regs, MUSB_TXCSR, csr); | |
275 | } else { | |
276 | csr = musb_readw(regs, MUSB_RXCSR); | |
277 | csr |= MUSB_RXCSR_CLRDATATOG | | |
278 | MUSB_RXCSR_P_WZC_BITS; | |
279 | csr &= ~(MUSB_RXCSR_P_SENDSTALL | | |
280 | MUSB_RXCSR_P_SENTSTALL); | |
281 | musb_writew(regs, MUSB_RXCSR, csr); | |
282 | } | |
283 | ||
284 | /* Maybe start the first request in the queue */ | |
285 | request = next_request(musb_ep); | |
286 | if (!musb_ep->busy && request) { | |
287 | dev_dbg(musb->controller, "restarting the request\n"); | |
288 | musb_ep_restart(musb, request); | |
289 | } | |
290 | ||
291 | /* select ep0 again */ | |
292 | musb_ep_select(mbase, 0); | |
293 | } break; | |
294 | default: | |
295 | /* class, vendor, etc ... delegate */ | |
296 | handled = 0; | |
297 | break; | |
298 | } | |
299 | break; | |
300 | ||
301 | case USB_REQ_SET_FEATURE: | |
302 | switch (recip) { | |
303 | case USB_RECIP_DEVICE: | |
304 | handled = 1; | |
305 | switch (ctrlrequest->wValue) { | |
306 | case USB_DEVICE_REMOTE_WAKEUP: | |
307 | musb->may_wakeup = 1; | |
308 | break; | |
309 | case USB_DEVICE_TEST_MODE: | |
310 | if (musb->g.speed != USB_SPEED_HIGH) | |
311 | goto stall; | |
312 | if (ctrlrequest->wIndex & 0xff) | |
313 | goto stall; | |
314 | ||
315 | switch (ctrlrequest->wIndex >> 8) { | |
316 | case 1: | |
317 | pr_debug("TEST_J\n"); | |
318 | /* TEST_J */ | |
319 | musb->test_mode_nr = | |
320 | MUSB_TEST_J; | |
321 | break; | |
322 | case 2: | |
323 | /* TEST_K */ | |
324 | pr_debug("TEST_K\n"); | |
325 | musb->test_mode_nr = | |
326 | MUSB_TEST_K; | |
327 | break; | |
328 | case 3: | |
329 | /* TEST_SE0_NAK */ | |
330 | pr_debug("TEST_SE0_NAK\n"); | |
331 | musb->test_mode_nr = | |
332 | MUSB_TEST_SE0_NAK; | |
333 | break; | |
334 | case 4: | |
335 | /* TEST_PACKET */ | |
336 | pr_debug("TEST_PACKET\n"); | |
337 | musb->test_mode_nr = | |
338 | MUSB_TEST_PACKET; | |
339 | break; | |
340 | ||
341 | case 0xc0: | |
342 | /* TEST_FORCE_HS */ | |
343 | pr_debug("TEST_FORCE_HS\n"); | |
344 | musb->test_mode_nr = | |
345 | MUSB_TEST_FORCE_HS; | |
346 | break; | |
347 | case 0xc1: | |
348 | /* TEST_FORCE_FS */ | |
349 | pr_debug("TEST_FORCE_FS\n"); | |
350 | musb->test_mode_nr = | |
351 | MUSB_TEST_FORCE_FS; | |
352 | break; | |
353 | case 0xc2: | |
354 | /* TEST_FIFO_ACCESS */ | |
355 | pr_debug("TEST_FIFO_ACCESS\n"); | |
356 | musb->test_mode_nr = | |
357 | MUSB_TEST_FIFO_ACCESS; | |
358 | break; | |
359 | case 0xc3: | |
360 | /* TEST_FORCE_HOST */ | |
361 | pr_debug("TEST_FORCE_HOST\n"); | |
362 | musb->test_mode_nr = | |
363 | MUSB_TEST_FORCE_HOST; | |
364 | break; | |
365 | default: | |
366 | goto stall; | |
367 | } | |
368 | ||
369 | /* enter test mode after irq */ | |
370 | if (handled > 0) | |
371 | musb->test_mode = true; | |
372 | break; | |
373 | case USB_DEVICE_B_HNP_ENABLE: | |
374 | if (!musb->g.is_otg) | |
375 | goto stall; | |
376 | musb->g.b_hnp_enable = 1; | |
377 | musb_try_b_hnp_enable(musb); | |
378 | break; | |
379 | case USB_DEVICE_A_HNP_SUPPORT: | |
380 | if (!musb->g.is_otg) | |
381 | goto stall; | |
382 | musb->g.a_hnp_support = 1; | |
383 | break; | |
384 | case USB_DEVICE_A_ALT_HNP_SUPPORT: | |
385 | if (!musb->g.is_otg) | |
386 | goto stall; | |
387 | musb->g.a_alt_hnp_support = 1; | |
388 | break; | |
389 | case USB_DEVICE_DEBUG_MODE: | |
390 | handled = 0; | |
391 | break; | |
392 | stall: | |
393 | default: | |
394 | handled = -EINVAL; | |
395 | break; | |
396 | } | |
397 | break; | |
398 | ||
399 | case USB_RECIP_INTERFACE: | |
400 | break; | |
401 | ||
402 | case USB_RECIP_ENDPOINT:{ | |
403 | const u8 epnum = | |
404 | ctrlrequest->wIndex & 0x0f; | |
405 | struct musb_ep *musb_ep; | |
406 | struct musb_hw_ep *ep; | |
407 | void __iomem *regs; | |
408 | int is_in; | |
409 | u16 csr; | |
410 | ||
411 | if (epnum == 0 || epnum >= MUSB_C_NUM_EPS || | |
412 | ctrlrequest->wValue != USB_ENDPOINT_HALT) | |
413 | break; | |
414 | ||
415 | ep = musb->endpoints + epnum; | |
416 | regs = ep->regs; | |
417 | is_in = ctrlrequest->wIndex & USB_DIR_IN; | |
418 | if (is_in) | |
419 | musb_ep = &ep->ep_in; | |
420 | else | |
421 | musb_ep = &ep->ep_out; | |
422 | if (!musb_ep->desc) | |
423 | break; | |
424 | ||
425 | musb_ep_select(mbase, epnum); | |
426 | if (is_in) { | |
427 | csr = musb_readw(regs, MUSB_TXCSR); | |
428 | if (csr & MUSB_TXCSR_FIFONOTEMPTY) | |
429 | csr |= MUSB_TXCSR_FLUSHFIFO; | |
430 | csr |= MUSB_TXCSR_P_SENDSTALL | |
431 | | MUSB_TXCSR_CLRDATATOG | |
432 | | MUSB_TXCSR_P_WZC_BITS; | |
433 | musb_writew(regs, MUSB_TXCSR, csr); | |
434 | } else { | |
435 | csr = musb_readw(regs, MUSB_RXCSR); | |
436 | csr |= MUSB_RXCSR_P_SENDSTALL | |
437 | | MUSB_RXCSR_FLUSHFIFO | |
438 | | MUSB_RXCSR_CLRDATATOG | |
439 | | MUSB_RXCSR_P_WZC_BITS; | |
440 | musb_writew(regs, MUSB_RXCSR, csr); | |
441 | } | |
442 | ||
443 | /* select ep0 again */ | |
444 | musb_ep_select(mbase, 0); | |
445 | handled = 1; | |
446 | } break; | |
447 | ||
448 | default: | |
449 | /* class, vendor, etc ... delegate */ | |
450 | handled = 0; | |
451 | break; | |
452 | } | |
453 | break; | |
454 | default: | |
455 | /* delegate SET_CONFIGURATION, etc */ | |
456 | handled = 0; | |
457 | } | |
458 | } else | |
459 | handled = 0; | |
460 | return handled; | |
461 | } | |
462 | ||
463 | /* we have an ep0out data packet | |
464 | * Context: caller holds controller lock | |
465 | */ | |
466 | static void ep0_rxstate(struct musb *musb) | |
467 | { | |
468 | void __iomem *regs = musb->control_ep->regs; | |
469 | struct musb_request *request; | |
470 | struct usb_request *req; | |
471 | u16 count, csr; | |
472 | ||
473 | request = next_ep0_request(musb); | |
474 | req = &request->request; | |
475 | ||
476 | /* read packet and ack; or stall because of gadget driver bug: | |
477 | * should have provided the rx buffer before setup() returned. | |
478 | */ | |
479 | if (req) { | |
480 | void *buf = req->buf + req->actual; | |
481 | unsigned len = req->length - req->actual; | |
482 | ||
483 | /* read the buffer */ | |
484 | count = musb_readb(regs, MUSB_COUNT0); | |
485 | if (count > len) { | |
486 | req->status = -EOVERFLOW; | |
487 | count = len; | |
488 | } | |
489 | musb_read_fifo(&musb->endpoints[0], count, buf); | |
490 | req->actual += count; | |
491 | csr = MUSB_CSR0_P_SVDRXPKTRDY; | |
492 | if (count < 64 || req->actual == req->length) { | |
493 | musb->ep0_state = MUSB_EP0_STAGE_STATUSIN; | |
494 | csr |= MUSB_CSR0_P_DATAEND; | |
495 | } else | |
496 | req = NULL; | |
497 | } else | |
498 | csr = MUSB_CSR0_P_SVDRXPKTRDY | MUSB_CSR0_P_SENDSTALL; | |
499 | ||
500 | ||
501 | /* Completion handler may choose to stall, e.g. because the | |
502 | * message just received holds invalid data. | |
503 | */ | |
504 | if (req) { | |
505 | musb->ackpend = csr; | |
506 | musb_g_ep0_giveback(musb, req); | |
507 | if (!musb->ackpend) | |
508 | return; | |
509 | musb->ackpend = 0; | |
510 | } | |
511 | musb_ep_select(musb->mregs, 0); | |
512 | musb_writew(regs, MUSB_CSR0, csr); | |
513 | } | |
514 | ||
515 | /* | |
516 | * transmitting to the host (IN), this code might be called from IRQ | |
517 | * and from kernel thread. | |
518 | * | |
519 | * Context: caller holds controller lock | |
520 | */ | |
521 | static void ep0_txstate(struct musb *musb) | |
522 | { | |
523 | void __iomem *regs = musb->control_ep->regs; | |
524 | struct musb_request *req = next_ep0_request(musb); | |
525 | struct usb_request *request; | |
526 | u16 csr = MUSB_CSR0_TXPKTRDY; | |
527 | u8 *fifo_src; | |
528 | u8 fifo_count; | |
529 | ||
530 | if (!req) { | |
531 | /* WARN_ON(1); */ | |
532 | dev_dbg(musb->controller, "odd; csr0 %04x\n", musb_readw(regs, MUSB_CSR0)); | |
533 | return; | |
534 | } | |
535 | ||
536 | request = &req->request; | |
537 | ||
538 | /* load the data */ | |
539 | fifo_src = (u8 *) request->buf + request->actual; | |
540 | fifo_count = min((unsigned) MUSB_EP0_FIFOSIZE, | |
541 | request->length - request->actual); | |
542 | musb_write_fifo(&musb->endpoints[0], fifo_count, fifo_src); | |
543 | request->actual += fifo_count; | |
544 | ||
545 | /* update the flags */ | |
546 | if (fifo_count < MUSB_MAX_END0_PACKET | |
547 | || (request->actual == request->length | |
548 | && !request->zero)) { | |
549 | musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT; | |
550 | csr |= MUSB_CSR0_P_DATAEND; | |
551 | } else | |
552 | request = NULL; | |
553 | ||
ab2f5c12 HS |
554 | /* send it out, triggering a "txpktrdy cleared" irq */ |
555 | musb_ep_select(musb->mregs, 0); | |
556 | musb_writew(regs, MUSB_CSR0, csr); | |
557 | ||
eb81955b IY |
558 | /* report completions as soon as the fifo's loaded; there's no |
559 | * win in waiting till this last packet gets acked. (other than | |
560 | * very precise fault reporting, needed by USB TMC; possible with | |
561 | * this hardware, but not usable from portable gadget drivers.) | |
562 | */ | |
563 | if (request) { | |
564 | musb->ackpend = csr; | |
565 | musb_g_ep0_giveback(musb, request); | |
566 | if (!musb->ackpend) | |
567 | return; | |
568 | musb->ackpend = 0; | |
569 | } | |
eb81955b IY |
570 | } |
571 | ||
572 | /* | |
573 | * Read a SETUP packet (struct usb_ctrlrequest) from the hardware. | |
574 | * Fields are left in USB byte-order. | |
575 | * | |
576 | * Context: caller holds controller lock. | |
577 | */ | |
578 | static void | |
579 | musb_read_setup(struct musb *musb, struct usb_ctrlrequest *req) | |
580 | { | |
581 | struct musb_request *r; | |
582 | void __iomem *regs = musb->control_ep->regs; | |
583 | ||
584 | musb_read_fifo(&musb->endpoints[0], sizeof *req, (u8 *)req); | |
585 | ||
586 | /* NOTE: earlier 2.6 versions changed setup packets to host | |
587 | * order, but now USB packets always stay in USB byte order. | |
588 | */ | |
589 | dev_dbg(musb->controller, "SETUP req%02x.%02x v%04x i%04x l%d\n", | |
590 | req->bRequestType, | |
591 | req->bRequest, | |
592 | le16_to_cpu(req->wValue), | |
593 | le16_to_cpu(req->wIndex), | |
594 | le16_to_cpu(req->wLength)); | |
595 | ||
596 | /* clean up any leftover transfers */ | |
597 | r = next_ep0_request(musb); | |
598 | if (r) | |
599 | musb_g_ep0_giveback(musb, &r->request); | |
600 | ||
601 | /* For zero-data requests we want to delay the STATUS stage to | |
602 | * avoid SETUPEND errors. If we read data (OUT), delay accepting | |
603 | * packets until there's a buffer to store them in. | |
604 | * | |
605 | * If we write data, the controller acts happier if we enable | |
606 | * the TX FIFO right away, and give the controller a moment | |
607 | * to switch modes... | |
608 | */ | |
609 | musb->set_address = false; | |
610 | musb->ackpend = MUSB_CSR0_P_SVDRXPKTRDY; | |
611 | if (req->wLength == 0) { | |
612 | if (req->bRequestType & USB_DIR_IN) | |
613 | musb->ackpend |= MUSB_CSR0_TXPKTRDY; | |
614 | musb->ep0_state = MUSB_EP0_STAGE_ACKWAIT; | |
615 | } else if (req->bRequestType & USB_DIR_IN) { | |
616 | musb->ep0_state = MUSB_EP0_STAGE_TX; | |
617 | musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SVDRXPKTRDY); | |
618 | while ((musb_readw(regs, MUSB_CSR0) | |
619 | & MUSB_CSR0_RXPKTRDY) != 0) | |
620 | cpu_relax(); | |
621 | musb->ackpend = 0; | |
622 | } else | |
623 | musb->ep0_state = MUSB_EP0_STAGE_RX; | |
624 | } | |
625 | ||
626 | static int | |
627 | forward_to_driver(struct musb *musb, const struct usb_ctrlrequest *ctrlrequest) | |
628 | __releases(musb->lock) | |
629 | __acquires(musb->lock) | |
630 | { | |
631 | int retval; | |
632 | if (!musb->gadget_driver) | |
633 | return -EOPNOTSUPP; | |
634 | spin_unlock(&musb->lock); | |
635 | retval = musb->gadget_driver->setup(&musb->g, ctrlrequest); | |
636 | spin_lock(&musb->lock); | |
637 | return retval; | |
638 | } | |
639 | ||
640 | /* | |
641 | * Handle peripheral ep0 interrupt | |
642 | * | |
643 | * Context: irq handler; we won't re-enter the driver that way. | |
644 | */ | |
645 | irqreturn_t musb_g_ep0_irq(struct musb *musb) | |
646 | { | |
647 | u16 csr; | |
648 | u16 len; | |
649 | void __iomem *mbase = musb->mregs; | |
650 | void __iomem *regs = musb->endpoints[0].regs; | |
651 | irqreturn_t retval = IRQ_NONE; | |
652 | ||
653 | musb_ep_select(mbase, 0); /* select ep0 */ | |
654 | csr = musb_readw(regs, MUSB_CSR0); | |
655 | len = musb_readb(regs, MUSB_COUNT0); | |
656 | ||
657 | dev_dbg(musb->controller, "csr %04x, count %d, myaddr %d, ep0stage %s\n", | |
658 | csr, len, | |
659 | musb_readb(mbase, MUSB_FADDR), | |
660 | decode_ep0stage(musb->ep0_state)); | |
661 | ||
662 | if (csr & MUSB_CSR0_P_DATAEND) { | |
663 | /* | |
664 | * If DATAEND is set we should not call the callback, | |
665 | * hence the status stage is not complete. | |
666 | */ | |
667 | return IRQ_HANDLED; | |
668 | } | |
669 | ||
670 | /* I sent a stall.. need to acknowledge it now.. */ | |
671 | if (csr & MUSB_CSR0_P_SENTSTALL) { | |
672 | musb_writew(regs, MUSB_CSR0, | |
673 | csr & ~MUSB_CSR0_P_SENTSTALL); | |
674 | retval = IRQ_HANDLED; | |
675 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; | |
676 | csr = musb_readw(regs, MUSB_CSR0); | |
677 | } | |
678 | ||
679 | /* request ended "early" */ | |
680 | if (csr & MUSB_CSR0_P_SETUPEND) { | |
681 | musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SVDSETUPEND); | |
682 | retval = IRQ_HANDLED; | |
683 | /* Transition into the early status phase */ | |
684 | switch (musb->ep0_state) { | |
685 | case MUSB_EP0_STAGE_TX: | |
686 | musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT; | |
687 | break; | |
688 | case MUSB_EP0_STAGE_RX: | |
689 | musb->ep0_state = MUSB_EP0_STAGE_STATUSIN; | |
690 | break; | |
691 | default: | |
692 | ERR("SetupEnd came in a wrong ep0stage %s\n", | |
693 | decode_ep0stage(musb->ep0_state)); | |
694 | } | |
695 | csr = musb_readw(regs, MUSB_CSR0); | |
696 | /* NOTE: request may need completion */ | |
697 | } | |
698 | ||
699 | /* docs from Mentor only describe tx, rx, and idle/setup states. | |
700 | * we need to handle nuances around status stages, and also the | |
701 | * case where status and setup stages come back-to-back ... | |
702 | */ | |
703 | switch (musb->ep0_state) { | |
704 | ||
705 | case MUSB_EP0_STAGE_TX: | |
706 | /* irq on clearing txpktrdy */ | |
707 | if ((csr & MUSB_CSR0_TXPKTRDY) == 0) { | |
708 | ep0_txstate(musb); | |
709 | retval = IRQ_HANDLED; | |
710 | } | |
711 | break; | |
712 | ||
713 | case MUSB_EP0_STAGE_RX: | |
714 | /* irq on set rxpktrdy */ | |
715 | if (csr & MUSB_CSR0_RXPKTRDY) { | |
716 | ep0_rxstate(musb); | |
717 | retval = IRQ_HANDLED; | |
718 | } | |
719 | break; | |
720 | ||
721 | case MUSB_EP0_STAGE_STATUSIN: | |
722 | /* end of sequence #2 (OUT/RX state) or #3 (no data) */ | |
723 | ||
724 | /* update address (if needed) only @ the end of the | |
725 | * status phase per usb spec, which also guarantees | |
726 | * we get 10 msec to receive this irq... until this | |
727 | * is done we won't see the next packet. | |
728 | */ | |
729 | if (musb->set_address) { | |
730 | musb->set_address = false; | |
731 | musb_writeb(mbase, MUSB_FADDR, musb->address); | |
732 | } | |
733 | ||
734 | /* enter test mode if needed (exit by reset) */ | |
735 | else if (musb->test_mode) { | |
736 | dev_dbg(musb->controller, "entering TESTMODE\n"); | |
737 | ||
738 | if (MUSB_TEST_PACKET == musb->test_mode_nr) | |
739 | musb_load_testpacket(musb); | |
740 | ||
741 | musb_writeb(mbase, MUSB_TESTMODE, | |
742 | musb->test_mode_nr); | |
743 | } | |
744 | /* FALLTHROUGH */ | |
745 | ||
746 | case MUSB_EP0_STAGE_STATUSOUT: | |
747 | /* end of sequence #1: write to host (TX state) */ | |
748 | { | |
749 | struct musb_request *req; | |
750 | ||
751 | req = next_ep0_request(musb); | |
752 | if (req) | |
753 | musb_g_ep0_giveback(musb, &req->request); | |
754 | } | |
755 | ||
756 | /* | |
757 | * In case when several interrupts can get coalesced, | |
758 | * check to see if we've already received a SETUP packet... | |
759 | */ | |
760 | if (csr & MUSB_CSR0_RXPKTRDY) | |
761 | goto setup; | |
762 | ||
763 | retval = IRQ_HANDLED; | |
764 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; | |
765 | break; | |
766 | ||
767 | case MUSB_EP0_STAGE_IDLE: | |
768 | /* | |
769 | * This state is typically (but not always) indiscernible | |
770 | * from the status states since the corresponding interrupts | |
771 | * tend to happen within too little period of time (with only | |
772 | * a zero-length packet in between) and so get coalesced... | |
773 | */ | |
774 | retval = IRQ_HANDLED; | |
775 | musb->ep0_state = MUSB_EP0_STAGE_SETUP; | |
776 | /* FALLTHROUGH */ | |
777 | ||
778 | case MUSB_EP0_STAGE_SETUP: | |
779 | setup: | |
780 | if (csr & MUSB_CSR0_RXPKTRDY) { | |
781 | struct usb_ctrlrequest setup; | |
782 | int handled = 0; | |
783 | ||
784 | if (len != 8) { | |
785 | ERR("SETUP packet len %d != 8 ?\n", len); | |
786 | break; | |
787 | } | |
788 | musb_read_setup(musb, &setup); | |
789 | retval = IRQ_HANDLED; | |
790 | ||
791 | /* sometimes the RESET won't be reported */ | |
792 | if (unlikely(musb->g.speed == USB_SPEED_UNKNOWN)) { | |
793 | u8 power; | |
794 | ||
795 | printk(KERN_NOTICE "%s: peripheral reset " | |
796 | "irq lost!\n", | |
797 | musb_driver_name); | |
798 | power = musb_readb(mbase, MUSB_POWER); | |
799 | musb->g.speed = (power & MUSB_POWER_HSMODE) | |
800 | ? USB_SPEED_HIGH : USB_SPEED_FULL; | |
801 | ||
802 | } | |
803 | ||
804 | switch (musb->ep0_state) { | |
805 | ||
806 | /* sequence #3 (no data stage), includes requests | |
807 | * we can't forward (notably SET_ADDRESS and the | |
808 | * device/endpoint feature set/clear operations) | |
809 | * plus SET_CONFIGURATION and others we must | |
810 | */ | |
811 | case MUSB_EP0_STAGE_ACKWAIT: | |
812 | handled = service_zero_data_request( | |
813 | musb, &setup); | |
814 | ||
815 | /* | |
816 | * We're expecting no data in any case, so | |
817 | * always set the DATAEND bit -- doing this | |
818 | * here helps avoid SetupEnd interrupt coming | |
819 | * in the idle stage when we're stalling... | |
820 | */ | |
821 | musb->ackpend |= MUSB_CSR0_P_DATAEND; | |
822 | ||
823 | /* status stage might be immediate */ | |
824 | if (handled > 0) | |
825 | musb->ep0_state = | |
826 | MUSB_EP0_STAGE_STATUSIN; | |
827 | break; | |
828 | ||
829 | /* sequence #1 (IN to host), includes GET_STATUS | |
830 | * requests that we can't forward, GET_DESCRIPTOR | |
831 | * and others that we must | |
832 | */ | |
833 | case MUSB_EP0_STAGE_TX: | |
834 | handled = service_in_request(musb, &setup); | |
835 | if (handled > 0) { | |
836 | musb->ackpend = MUSB_CSR0_TXPKTRDY | |
837 | | MUSB_CSR0_P_DATAEND; | |
838 | musb->ep0_state = | |
839 | MUSB_EP0_STAGE_STATUSOUT; | |
840 | } | |
841 | break; | |
842 | ||
843 | /* sequence #2 (OUT from host), always forward */ | |
844 | default: /* MUSB_EP0_STAGE_RX */ | |
845 | break; | |
846 | } | |
847 | ||
848 | dev_dbg(musb->controller, "handled %d, csr %04x, ep0stage %s\n", | |
849 | handled, csr, | |
850 | decode_ep0stage(musb->ep0_state)); | |
851 | ||
852 | /* unless we need to delegate this to the gadget | |
853 | * driver, we know how to wrap this up: csr0 has | |
854 | * not yet been written. | |
855 | */ | |
856 | if (handled < 0) | |
857 | goto stall; | |
858 | else if (handled > 0) | |
859 | goto finish; | |
860 | ||
861 | handled = forward_to_driver(musb, &setup); | |
862 | if (handled < 0) { | |
863 | musb_ep_select(mbase, 0); | |
864 | stall: | |
865 | dev_dbg(musb->controller, "stall (%d)\n", handled); | |
866 | musb->ackpend |= MUSB_CSR0_P_SENDSTALL; | |
867 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; | |
868 | finish: | |
869 | musb_writew(regs, MUSB_CSR0, | |
870 | musb->ackpend); | |
871 | musb->ackpend = 0; | |
872 | } | |
873 | } | |
874 | break; | |
875 | ||
876 | case MUSB_EP0_STAGE_ACKWAIT: | |
877 | /* This should not happen. But happens with tusb6010 with | |
878 | * g_file_storage and high speed. Do nothing. | |
879 | */ | |
880 | retval = IRQ_HANDLED; | |
881 | break; | |
882 | ||
883 | default: | |
884 | /* "can't happen" */ | |
885 | WARN_ON(1); | |
886 | musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SENDSTALL); | |
887 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; | |
888 | break; | |
889 | } | |
890 | ||
891 | return retval; | |
892 | } | |
893 | ||
894 | ||
895 | static int | |
896 | musb_g_ep0_enable(struct usb_ep *ep, const struct usb_endpoint_descriptor *desc) | |
897 | { | |
898 | /* always enabled */ | |
899 | return -EINVAL; | |
900 | } | |
901 | ||
902 | static int musb_g_ep0_disable(struct usb_ep *e) | |
903 | { | |
904 | /* always enabled */ | |
905 | return -EINVAL; | |
906 | } | |
907 | ||
908 | static int | |
909 | musb_g_ep0_queue(struct usb_ep *e, struct usb_request *r, gfp_t gfp_flags) | |
910 | { | |
911 | struct musb_ep *ep; | |
912 | struct musb_request *req; | |
913 | struct musb *musb; | |
914 | int status; | |
915 | unsigned long lockflags; | |
916 | void __iomem *regs; | |
917 | ||
918 | if (!e || !r) | |
919 | return -EINVAL; | |
920 | ||
921 | ep = to_musb_ep(e); | |
922 | musb = ep->musb; | |
923 | regs = musb->control_ep->regs; | |
924 | ||
925 | req = to_musb_request(r); | |
926 | req->musb = musb; | |
927 | req->request.actual = 0; | |
928 | req->request.status = -EINPROGRESS; | |
929 | req->tx = ep->is_in; | |
930 | ||
931 | spin_lock_irqsave(&musb->lock, lockflags); | |
932 | ||
933 | if (!list_empty(&ep->req_list)) { | |
934 | status = -EBUSY; | |
935 | goto cleanup; | |
936 | } | |
937 | ||
938 | switch (musb->ep0_state) { | |
939 | case MUSB_EP0_STAGE_RX: /* control-OUT data */ | |
940 | case MUSB_EP0_STAGE_TX: /* control-IN data */ | |
941 | case MUSB_EP0_STAGE_ACKWAIT: /* zero-length data */ | |
942 | status = 0; | |
943 | break; | |
944 | default: | |
945 | dev_dbg(musb->controller, "ep0 request queued in state %d\n", | |
946 | musb->ep0_state); | |
947 | status = -EINVAL; | |
948 | goto cleanup; | |
949 | } | |
950 | ||
951 | /* add request to the list */ | |
952 | list_add_tail(&req->list, &ep->req_list); | |
953 | ||
954 | dev_dbg(musb->controller, "queue to %s (%s), length=%d\n", | |
955 | ep->name, ep->is_in ? "IN/TX" : "OUT/RX", | |
956 | req->request.length); | |
957 | ||
958 | musb_ep_select(musb->mregs, 0); | |
959 | ||
960 | /* sequence #1, IN ... start writing the data */ | |
961 | if (musb->ep0_state == MUSB_EP0_STAGE_TX) | |
962 | ep0_txstate(musb); | |
963 | ||
964 | /* sequence #3, no-data ... issue IN status */ | |
965 | else if (musb->ep0_state == MUSB_EP0_STAGE_ACKWAIT) { | |
966 | if (req->request.length) | |
967 | status = -EINVAL; | |
968 | else { | |
969 | musb->ep0_state = MUSB_EP0_STAGE_STATUSIN; | |
970 | musb_writew(regs, MUSB_CSR0, | |
971 | musb->ackpend | MUSB_CSR0_P_DATAEND); | |
972 | musb->ackpend = 0; | |
973 | musb_g_ep0_giveback(ep->musb, r); | |
974 | } | |
975 | ||
976 | /* else for sequence #2 (OUT), caller provides a buffer | |
977 | * before the next packet arrives. deferred responses | |
978 | * (after SETUP is acked) are racey. | |
979 | */ | |
980 | } else if (musb->ackpend) { | |
981 | musb_writew(regs, MUSB_CSR0, musb->ackpend); | |
982 | musb->ackpend = 0; | |
983 | } | |
984 | ||
985 | cleanup: | |
986 | spin_unlock_irqrestore(&musb->lock, lockflags); | |
987 | return status; | |
988 | } | |
989 | ||
990 | static int musb_g_ep0_dequeue(struct usb_ep *ep, struct usb_request *req) | |
991 | { | |
992 | /* we just won't support this */ | |
993 | return -EINVAL; | |
994 | } | |
995 | ||
996 | static int musb_g_ep0_halt(struct usb_ep *e, int value) | |
997 | { | |
998 | struct musb_ep *ep; | |
999 | struct musb *musb; | |
1000 | void __iomem *base, *regs; | |
1001 | unsigned long flags; | |
1002 | int status; | |
1003 | u16 csr; | |
1004 | ||
1005 | if (!e || !value) | |
1006 | return -EINVAL; | |
1007 | ||
1008 | ep = to_musb_ep(e); | |
1009 | musb = ep->musb; | |
1010 | base = musb->mregs; | |
1011 | regs = musb->control_ep->regs; | |
1012 | status = 0; | |
1013 | ||
1014 | spin_lock_irqsave(&musb->lock, flags); | |
1015 | ||
1016 | if (!list_empty(&ep->req_list)) { | |
1017 | status = -EBUSY; | |
1018 | goto cleanup; | |
1019 | } | |
1020 | ||
1021 | musb_ep_select(base, 0); | |
1022 | csr = musb->ackpend; | |
1023 | ||
1024 | switch (musb->ep0_state) { | |
1025 | ||
1026 | /* Stalls are usually issued after parsing SETUP packet, either | |
1027 | * directly in irq context from setup() or else later. | |
1028 | */ | |
1029 | case MUSB_EP0_STAGE_TX: /* control-IN data */ | |
1030 | case MUSB_EP0_STAGE_ACKWAIT: /* STALL for zero-length data */ | |
1031 | case MUSB_EP0_STAGE_RX: /* control-OUT data */ | |
1032 | csr = musb_readw(regs, MUSB_CSR0); | |
1033 | /* FALLTHROUGH */ | |
1034 | ||
1035 | /* It's also OK to issue stalls during callbacks when a non-empty | |
1036 | * DATA stage buffer has been read (or even written). | |
1037 | */ | |
1038 | case MUSB_EP0_STAGE_STATUSIN: /* control-OUT status */ | |
1039 | case MUSB_EP0_STAGE_STATUSOUT: /* control-IN status */ | |
1040 | ||
1041 | csr |= MUSB_CSR0_P_SENDSTALL; | |
1042 | musb_writew(regs, MUSB_CSR0, csr); | |
1043 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; | |
1044 | musb->ackpend = 0; | |
1045 | break; | |
1046 | default: | |
1047 | dev_dbg(musb->controller, "ep0 can't halt in state %d\n", musb->ep0_state); | |
1048 | status = -EINVAL; | |
1049 | } | |
1050 | ||
1051 | cleanup: | |
1052 | spin_unlock_irqrestore(&musb->lock, flags); | |
1053 | return status; | |
1054 | } | |
1055 | ||
1056 | const struct usb_ep_ops musb_g_ep0_ops = { | |
1057 | .enable = musb_g_ep0_enable, | |
1058 | .disable = musb_g_ep0_disable, | |
1059 | .alloc_request = musb_alloc_request, | |
1060 | .free_request = musb_free_request, | |
1061 | .queue = musb_g_ep0_queue, | |
1062 | .dequeue = musb_g_ep0_dequeue, | |
1063 | .set_halt = musb_g_ep0_halt, | |
1064 | }; |