Commit | Line | Data |
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550a7375 FB |
1 | /* |
2 | * MUSB OTG peripheral driver ep0 handling | |
3 | * | |
4 | * Copyright 2005 Mentor Graphics Corporation | |
5 | * Copyright (C) 2005-2006 by Texas Instruments | |
6 | * Copyright (C) 2006-2007 Nokia Corporation | |
a5073b52 | 7 | * Copyright (C) 2008-2009 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/spinlock.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/device.h> | |
42 | #include <linux/interrupt.h> | |
43 | ||
44 | #include "musb_core.h" | |
45 | ||
46 | /* ep0 is always musb->endpoints[0].ep_in */ | |
47 | #define next_ep0_request(musb) next_in_request(&(musb)->endpoints[0]) | |
48 | ||
49 | /* | |
50 | * locking note: we use only the controller lock, for simpler correctness. | |
51 | * It's always held with IRQs blocked. | |
52 | * | |
53 | * It protects the ep0 request queue as well as ep0_state, not just the | |
54 | * controller and indexed registers. And that lock stays held unless it | |
55 | * needs to be dropped to allow reentering this driver ... like upcalls to | |
56 | * the gadget driver, or adjusting endpoint halt status. | |
57 | */ | |
58 | ||
59 | static char *decode_ep0stage(u8 stage) | |
60 | { | |
61 | switch (stage) { | |
a5073b52 SS |
62 | case MUSB_EP0_STAGE_IDLE: return "idle"; |
63 | case MUSB_EP0_STAGE_SETUP: return "setup"; | |
550a7375 FB |
64 | case MUSB_EP0_STAGE_TX: return "in"; |
65 | case MUSB_EP0_STAGE_RX: return "out"; | |
66 | case MUSB_EP0_STAGE_ACKWAIT: return "wait"; | |
67 | case MUSB_EP0_STAGE_STATUSIN: return "in/status"; | |
68 | case MUSB_EP0_STAGE_STATUSOUT: return "out/status"; | |
69 | default: return "?"; | |
70 | } | |
71 | } | |
72 | ||
73 | /* handle a standard GET_STATUS request | |
74 | * Context: caller holds controller lock | |
75 | */ | |
76 | static int service_tx_status_request( | |
77 | struct musb *musb, | |
78 | const struct usb_ctrlrequest *ctrlrequest) | |
79 | { | |
80 | void __iomem *mbase = musb->mregs; | |
81 | int handled = 1; | |
82 | u8 result[2], epnum = 0; | |
83 | const u8 recip = ctrlrequest->bRequestType & USB_RECIP_MASK; | |
84 | ||
85 | result[1] = 0; | |
86 | ||
87 | switch (recip) { | |
88 | case USB_RECIP_DEVICE: | |
89 | result[0] = musb->is_self_powered << USB_DEVICE_SELF_POWERED; | |
90 | result[0] |= musb->may_wakeup << USB_DEVICE_REMOTE_WAKEUP; | |
91 | #ifdef CONFIG_USB_MUSB_OTG | |
92 | if (musb->g.is_otg) { | |
93 | result[0] |= musb->g.b_hnp_enable | |
94 | << USB_DEVICE_B_HNP_ENABLE; | |
95 | result[0] |= musb->g.a_alt_hnp_support | |
96 | << USB_DEVICE_A_ALT_HNP_SUPPORT; | |
97 | result[0] |= musb->g.a_hnp_support | |
98 | << USB_DEVICE_A_HNP_SUPPORT; | |
99 | } | |
100 | #endif | |
101 | break; | |
102 | ||
103 | case USB_RECIP_INTERFACE: | |
104 | result[0] = 0; | |
105 | break; | |
106 | ||
107 | case USB_RECIP_ENDPOINT: { | |
108 | int is_in; | |
109 | struct musb_ep *ep; | |
110 | u16 tmp; | |
111 | void __iomem *regs; | |
112 | ||
113 | epnum = (u8) ctrlrequest->wIndex; | |
114 | if (!epnum) { | |
115 | result[0] = 0; | |
116 | break; | |
117 | } | |
118 | ||
119 | is_in = epnum & USB_DIR_IN; | |
120 | if (is_in) { | |
121 | epnum &= 0x0f; | |
122 | ep = &musb->endpoints[epnum].ep_in; | |
123 | } else { | |
124 | ep = &musb->endpoints[epnum].ep_out; | |
125 | } | |
126 | regs = musb->endpoints[epnum].regs; | |
127 | ||
128 | if (epnum >= MUSB_C_NUM_EPS || !ep->desc) { | |
129 | handled = -EINVAL; | |
130 | break; | |
131 | } | |
132 | ||
133 | musb_ep_select(mbase, epnum); | |
134 | if (is_in) | |
135 | tmp = musb_readw(regs, MUSB_TXCSR) | |
136 | & MUSB_TXCSR_P_SENDSTALL; | |
137 | else | |
138 | tmp = musb_readw(regs, MUSB_RXCSR) | |
139 | & MUSB_RXCSR_P_SENDSTALL; | |
140 | musb_ep_select(mbase, 0); | |
141 | ||
142 | result[0] = tmp ? 1 : 0; | |
143 | } break; | |
144 | ||
145 | default: | |
146 | /* class, vendor, etc ... delegate */ | |
147 | handled = 0; | |
148 | break; | |
149 | } | |
150 | ||
151 | /* fill up the fifo; caller updates csr0 */ | |
152 | if (handled > 0) { | |
153 | u16 len = le16_to_cpu(ctrlrequest->wLength); | |
154 | ||
155 | if (len > 2) | |
156 | len = 2; | |
157 | musb_write_fifo(&musb->endpoints[0], len, result); | |
158 | } | |
159 | ||
160 | return handled; | |
161 | } | |
162 | ||
163 | /* | |
164 | * handle a control-IN request, the end0 buffer contains the current request | |
165 | * that is supposed to be a standard control request. Assumes the fifo to | |
166 | * be at least 2 bytes long. | |
167 | * | |
168 | * @return 0 if the request was NOT HANDLED, | |
169 | * < 0 when error | |
170 | * > 0 when the request is processed | |
171 | * | |
172 | * Context: caller holds controller lock | |
173 | */ | |
174 | static int | |
175 | service_in_request(struct musb *musb, const struct usb_ctrlrequest *ctrlrequest) | |
176 | { | |
177 | int handled = 0; /* not handled */ | |
178 | ||
179 | if ((ctrlrequest->bRequestType & USB_TYPE_MASK) | |
180 | == USB_TYPE_STANDARD) { | |
181 | switch (ctrlrequest->bRequest) { | |
182 | case USB_REQ_GET_STATUS: | |
183 | handled = service_tx_status_request(musb, | |
184 | ctrlrequest); | |
185 | break; | |
186 | ||
187 | /* case USB_REQ_SYNC_FRAME: */ | |
188 | ||
189 | default: | |
190 | break; | |
191 | } | |
192 | } | |
193 | return handled; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Context: caller holds controller lock | |
198 | */ | |
199 | static void musb_g_ep0_giveback(struct musb *musb, struct usb_request *req) | |
200 | { | |
201 | musb_g_giveback(&musb->endpoints[0].ep_in, req, 0); | |
550a7375 FB |
202 | } |
203 | ||
204 | /* | |
205 | * Tries to start B-device HNP negotiation if enabled via sysfs | |
206 | */ | |
207 | static inline void musb_try_b_hnp_enable(struct musb *musb) | |
208 | { | |
209 | void __iomem *mbase = musb->mregs; | |
210 | u8 devctl; | |
211 | ||
212 | DBG(1, "HNP: Setting HR\n"); | |
213 | devctl = musb_readb(mbase, MUSB_DEVCTL); | |
214 | musb_writeb(mbase, MUSB_DEVCTL, devctl | MUSB_DEVCTL_HR); | |
215 | } | |
216 | ||
217 | /* | |
218 | * Handle all control requests with no DATA stage, including standard | |
219 | * requests such as: | |
220 | * USB_REQ_SET_CONFIGURATION, USB_REQ_SET_INTERFACE, unrecognized | |
221 | * always delegated to the gadget driver | |
222 | * USB_REQ_SET_ADDRESS, USB_REQ_CLEAR_FEATURE, USB_REQ_SET_FEATURE | |
223 | * always handled here, except for class/vendor/... features | |
224 | * | |
225 | * Context: caller holds controller lock | |
226 | */ | |
227 | static int | |
228 | service_zero_data_request(struct musb *musb, | |
229 | struct usb_ctrlrequest *ctrlrequest) | |
230 | __releases(musb->lock) | |
231 | __acquires(musb->lock) | |
232 | { | |
233 | int handled = -EINVAL; | |
234 | void __iomem *mbase = musb->mregs; | |
235 | const u8 recip = ctrlrequest->bRequestType & USB_RECIP_MASK; | |
236 | ||
237 | /* the gadget driver handles everything except what we MUST handle */ | |
238 | if ((ctrlrequest->bRequestType & USB_TYPE_MASK) | |
239 | == USB_TYPE_STANDARD) { | |
240 | switch (ctrlrequest->bRequest) { | |
241 | case USB_REQ_SET_ADDRESS: | |
242 | /* change it after the status stage */ | |
243 | musb->set_address = true; | |
244 | musb->address = (u8) (ctrlrequest->wValue & 0x7f); | |
245 | handled = 1; | |
246 | break; | |
247 | ||
248 | case USB_REQ_CLEAR_FEATURE: | |
249 | switch (recip) { | |
250 | case USB_RECIP_DEVICE: | |
251 | if (ctrlrequest->wValue | |
252 | != USB_DEVICE_REMOTE_WAKEUP) | |
253 | break; | |
254 | musb->may_wakeup = 0; | |
255 | handled = 1; | |
256 | break; | |
257 | case USB_RECIP_INTERFACE: | |
258 | break; | |
259 | case USB_RECIP_ENDPOINT:{ | |
260 | const u8 num = ctrlrequest->wIndex & 0x0f; | |
261 | struct musb_ep *musb_ep; | |
262 | ||
263 | if (num == 0 | |
264 | || num >= MUSB_C_NUM_EPS | |
265 | || ctrlrequest->wValue | |
266 | != USB_ENDPOINT_HALT) | |
267 | break; | |
268 | ||
269 | if (ctrlrequest->wIndex & USB_DIR_IN) | |
270 | musb_ep = &musb->endpoints[num].ep_in; | |
271 | else | |
272 | musb_ep = &musb->endpoints[num].ep_out; | |
273 | if (!musb_ep->desc) | |
274 | break; | |
275 | ||
276 | /* REVISIT do it directly, no locking games */ | |
277 | spin_unlock(&musb->lock); | |
278 | musb_gadget_set_halt(&musb_ep->end_point, 0); | |
279 | spin_lock(&musb->lock); | |
280 | ||
281 | /* select ep0 again */ | |
282 | musb_ep_select(mbase, 0); | |
283 | handled = 1; | |
284 | } break; | |
285 | default: | |
286 | /* class, vendor, etc ... delegate */ | |
287 | handled = 0; | |
288 | break; | |
289 | } | |
290 | break; | |
291 | ||
292 | case USB_REQ_SET_FEATURE: | |
293 | switch (recip) { | |
294 | case USB_RECIP_DEVICE: | |
295 | handled = 1; | |
296 | switch (ctrlrequest->wValue) { | |
297 | case USB_DEVICE_REMOTE_WAKEUP: | |
298 | musb->may_wakeup = 1; | |
299 | break; | |
300 | case USB_DEVICE_TEST_MODE: | |
301 | if (musb->g.speed != USB_SPEED_HIGH) | |
302 | goto stall; | |
303 | if (ctrlrequest->wIndex & 0xff) | |
304 | goto stall; | |
305 | ||
306 | switch (ctrlrequest->wIndex >> 8) { | |
307 | case 1: | |
308 | pr_debug("TEST_J\n"); | |
309 | /* TEST_J */ | |
310 | musb->test_mode_nr = | |
311 | MUSB_TEST_J; | |
312 | break; | |
313 | case 2: | |
314 | /* TEST_K */ | |
315 | pr_debug("TEST_K\n"); | |
316 | musb->test_mode_nr = | |
317 | MUSB_TEST_K; | |
318 | break; | |
319 | case 3: | |
320 | /* TEST_SE0_NAK */ | |
321 | pr_debug("TEST_SE0_NAK\n"); | |
322 | musb->test_mode_nr = | |
323 | MUSB_TEST_SE0_NAK; | |
324 | break; | |
325 | case 4: | |
326 | /* TEST_PACKET */ | |
327 | pr_debug("TEST_PACKET\n"); | |
328 | musb->test_mode_nr = | |
329 | MUSB_TEST_PACKET; | |
330 | break; | |
331 | default: | |
332 | goto stall; | |
333 | } | |
334 | ||
335 | /* enter test mode after irq */ | |
336 | if (handled > 0) | |
337 | musb->test_mode = true; | |
338 | break; | |
339 | #ifdef CONFIG_USB_MUSB_OTG | |
340 | case USB_DEVICE_B_HNP_ENABLE: | |
341 | if (!musb->g.is_otg) | |
342 | goto stall; | |
343 | musb->g.b_hnp_enable = 1; | |
344 | musb_try_b_hnp_enable(musb); | |
345 | break; | |
346 | case USB_DEVICE_A_HNP_SUPPORT: | |
347 | if (!musb->g.is_otg) | |
348 | goto stall; | |
349 | musb->g.a_hnp_support = 1; | |
350 | break; | |
351 | case USB_DEVICE_A_ALT_HNP_SUPPORT: | |
352 | if (!musb->g.is_otg) | |
353 | goto stall; | |
354 | musb->g.a_alt_hnp_support = 1; | |
355 | break; | |
356 | #endif | |
357 | stall: | |
358 | default: | |
359 | handled = -EINVAL; | |
360 | break; | |
361 | } | |
362 | break; | |
363 | ||
364 | case USB_RECIP_INTERFACE: | |
365 | break; | |
366 | ||
367 | case USB_RECIP_ENDPOINT:{ | |
368 | const u8 epnum = | |
369 | ctrlrequest->wIndex & 0x0f; | |
370 | struct musb_ep *musb_ep; | |
371 | struct musb_hw_ep *ep; | |
372 | void __iomem *regs; | |
373 | int is_in; | |
374 | u16 csr; | |
375 | ||
376 | if (epnum == 0 | |
377 | || epnum >= MUSB_C_NUM_EPS | |
378 | || ctrlrequest->wValue | |
379 | != USB_ENDPOINT_HALT) | |
380 | break; | |
381 | ||
382 | ep = musb->endpoints + epnum; | |
383 | regs = ep->regs; | |
384 | is_in = ctrlrequest->wIndex & USB_DIR_IN; | |
385 | if (is_in) | |
386 | musb_ep = &ep->ep_in; | |
387 | else | |
388 | musb_ep = &ep->ep_out; | |
389 | if (!musb_ep->desc) | |
390 | break; | |
391 | ||
392 | musb_ep_select(mbase, epnum); | |
393 | if (is_in) { | |
394 | csr = musb_readw(regs, | |
395 | MUSB_TXCSR); | |
396 | if (csr & MUSB_TXCSR_FIFONOTEMPTY) | |
397 | csr |= MUSB_TXCSR_FLUSHFIFO; | |
398 | csr |= MUSB_TXCSR_P_SENDSTALL | |
399 | | MUSB_TXCSR_CLRDATATOG | |
400 | | MUSB_TXCSR_P_WZC_BITS; | |
401 | musb_writew(regs, MUSB_TXCSR, | |
402 | csr); | |
403 | } else { | |
404 | csr = musb_readw(regs, | |
405 | MUSB_RXCSR); | |
406 | csr |= MUSB_RXCSR_P_SENDSTALL | |
407 | | MUSB_RXCSR_FLUSHFIFO | |
408 | | MUSB_RXCSR_CLRDATATOG | |
f01b017d | 409 | | MUSB_RXCSR_P_WZC_BITS; |
550a7375 FB |
410 | musb_writew(regs, MUSB_RXCSR, |
411 | csr); | |
412 | } | |
413 | ||
414 | /* select ep0 again */ | |
415 | musb_ep_select(mbase, 0); | |
416 | handled = 1; | |
417 | } break; | |
418 | ||
419 | default: | |
420 | /* class, vendor, etc ... delegate */ | |
421 | handled = 0; | |
422 | break; | |
423 | } | |
424 | break; | |
425 | default: | |
426 | /* delegate SET_CONFIGURATION, etc */ | |
427 | handled = 0; | |
428 | } | |
429 | } else | |
430 | handled = 0; | |
431 | return handled; | |
432 | } | |
433 | ||
434 | /* we have an ep0out data packet | |
435 | * Context: caller holds controller lock | |
436 | */ | |
437 | static void ep0_rxstate(struct musb *musb) | |
438 | { | |
439 | void __iomem *regs = musb->control_ep->regs; | |
440 | struct usb_request *req; | |
64ca44a6 | 441 | u16 count, csr; |
550a7375 FB |
442 | |
443 | req = next_ep0_request(musb); | |
444 | ||
445 | /* read packet and ack; or stall because of gadget driver bug: | |
446 | * should have provided the rx buffer before setup() returned. | |
447 | */ | |
448 | if (req) { | |
449 | void *buf = req->buf + req->actual; | |
450 | unsigned len = req->length - req->actual; | |
451 | ||
452 | /* read the buffer */ | |
64ca44a6 BW |
453 | count = musb_readb(regs, MUSB_COUNT0); |
454 | if (count > len) { | |
550a7375 | 455 | req->status = -EOVERFLOW; |
64ca44a6 | 456 | count = len; |
550a7375 | 457 | } |
64ca44a6 BW |
458 | musb_read_fifo(&musb->endpoints[0], count, buf); |
459 | req->actual += count; | |
460 | csr = MUSB_CSR0_P_SVDRXPKTRDY; | |
461 | if (count < 64 || req->actual == req->length) { | |
550a7375 | 462 | musb->ep0_state = MUSB_EP0_STAGE_STATUSIN; |
64ca44a6 | 463 | csr |= MUSB_CSR0_P_DATAEND; |
550a7375 FB |
464 | } else |
465 | req = NULL; | |
466 | } else | |
64ca44a6 | 467 | csr = MUSB_CSR0_P_SVDRXPKTRDY | MUSB_CSR0_P_SENDSTALL; |
550a7375 FB |
468 | |
469 | ||
470 | /* Completion handler may choose to stall, e.g. because the | |
471 | * message just received holds invalid data. | |
472 | */ | |
473 | if (req) { | |
64ca44a6 | 474 | musb->ackpend = csr; |
550a7375 FB |
475 | musb_g_ep0_giveback(musb, req); |
476 | if (!musb->ackpend) | |
477 | return; | |
478 | musb->ackpend = 0; | |
479 | } | |
fb85d991 | 480 | musb_ep_select(musb->mregs, 0); |
64ca44a6 | 481 | musb_writew(regs, MUSB_CSR0, csr); |
550a7375 FB |
482 | } |
483 | ||
484 | /* | |
485 | * transmitting to the host (IN), this code might be called from IRQ | |
486 | * and from kernel thread. | |
487 | * | |
488 | * Context: caller holds controller lock | |
489 | */ | |
490 | static void ep0_txstate(struct musb *musb) | |
491 | { | |
492 | void __iomem *regs = musb->control_ep->regs; | |
493 | struct usb_request *request = next_ep0_request(musb); | |
494 | u16 csr = MUSB_CSR0_TXPKTRDY; | |
495 | u8 *fifo_src; | |
496 | u8 fifo_count; | |
497 | ||
498 | if (!request) { | |
499 | /* WARN_ON(1); */ | |
500 | DBG(2, "odd; csr0 %04x\n", musb_readw(regs, MUSB_CSR0)); | |
501 | return; | |
502 | } | |
503 | ||
504 | /* load the data */ | |
505 | fifo_src = (u8 *) request->buf + request->actual; | |
506 | fifo_count = min((unsigned) MUSB_EP0_FIFOSIZE, | |
507 | request->length - request->actual); | |
508 | musb_write_fifo(&musb->endpoints[0], fifo_count, fifo_src); | |
509 | request->actual += fifo_count; | |
510 | ||
511 | /* update the flags */ | |
512 | if (fifo_count < MUSB_MAX_END0_PACKET | |
5542bc2a DG |
513 | || (request->actual == request->length |
514 | && !request->zero)) { | |
550a7375 FB |
515 | musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT; |
516 | csr |= MUSB_CSR0_P_DATAEND; | |
517 | } else | |
518 | request = NULL; | |
519 | ||
520 | /* report completions as soon as the fifo's loaded; there's no | |
521 | * win in waiting till this last packet gets acked. (other than | |
522 | * very precise fault reporting, needed by USB TMC; possible with | |
523 | * this hardware, but not usable from portable gadget drivers.) | |
524 | */ | |
525 | if (request) { | |
526 | musb->ackpend = csr; | |
527 | musb_g_ep0_giveback(musb, request); | |
528 | if (!musb->ackpend) | |
529 | return; | |
530 | musb->ackpend = 0; | |
531 | } | |
532 | ||
533 | /* send it out, triggering a "txpktrdy cleared" irq */ | |
fb85d991 | 534 | musb_ep_select(musb->mregs, 0); |
550a7375 FB |
535 | musb_writew(regs, MUSB_CSR0, csr); |
536 | } | |
537 | ||
538 | /* | |
539 | * Read a SETUP packet (struct usb_ctrlrequest) from the hardware. | |
540 | * Fields are left in USB byte-order. | |
541 | * | |
542 | * Context: caller holds controller lock. | |
543 | */ | |
544 | static void | |
545 | musb_read_setup(struct musb *musb, struct usb_ctrlrequest *req) | |
546 | { | |
547 | struct usb_request *r; | |
548 | void __iomem *regs = musb->control_ep->regs; | |
549 | ||
550 | musb_read_fifo(&musb->endpoints[0], sizeof *req, (u8 *)req); | |
551 | ||
552 | /* NOTE: earlier 2.6 versions changed setup packets to host | |
553 | * order, but now USB packets always stay in USB byte order. | |
554 | */ | |
555 | DBG(3, "SETUP req%02x.%02x v%04x i%04x l%d\n", | |
556 | req->bRequestType, | |
557 | req->bRequest, | |
558 | le16_to_cpu(req->wValue), | |
559 | le16_to_cpu(req->wIndex), | |
560 | le16_to_cpu(req->wLength)); | |
561 | ||
562 | /* clean up any leftover transfers */ | |
563 | r = next_ep0_request(musb); | |
564 | if (r) | |
565 | musb_g_ep0_giveback(musb, r); | |
566 | ||
567 | /* For zero-data requests we want to delay the STATUS stage to | |
568 | * avoid SETUPEND errors. If we read data (OUT), delay accepting | |
569 | * packets until there's a buffer to store them in. | |
570 | * | |
571 | * If we write data, the controller acts happier if we enable | |
572 | * the TX FIFO right away, and give the controller a moment | |
573 | * to switch modes... | |
574 | */ | |
575 | musb->set_address = false; | |
576 | musb->ackpend = MUSB_CSR0_P_SVDRXPKTRDY; | |
577 | if (req->wLength == 0) { | |
578 | if (req->bRequestType & USB_DIR_IN) | |
579 | musb->ackpend |= MUSB_CSR0_TXPKTRDY; | |
580 | musb->ep0_state = MUSB_EP0_STAGE_ACKWAIT; | |
581 | } else if (req->bRequestType & USB_DIR_IN) { | |
582 | musb->ep0_state = MUSB_EP0_STAGE_TX; | |
583 | musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SVDRXPKTRDY); | |
584 | while ((musb_readw(regs, MUSB_CSR0) | |
585 | & MUSB_CSR0_RXPKTRDY) != 0) | |
586 | cpu_relax(); | |
587 | musb->ackpend = 0; | |
588 | } else | |
589 | musb->ep0_state = MUSB_EP0_STAGE_RX; | |
590 | } | |
591 | ||
592 | static int | |
593 | forward_to_driver(struct musb *musb, const struct usb_ctrlrequest *ctrlrequest) | |
594 | __releases(musb->lock) | |
595 | __acquires(musb->lock) | |
596 | { | |
597 | int retval; | |
598 | if (!musb->gadget_driver) | |
599 | return -EOPNOTSUPP; | |
600 | spin_unlock(&musb->lock); | |
601 | retval = musb->gadget_driver->setup(&musb->g, ctrlrequest); | |
602 | spin_lock(&musb->lock); | |
603 | return retval; | |
604 | } | |
605 | ||
606 | /* | |
607 | * Handle peripheral ep0 interrupt | |
608 | * | |
609 | * Context: irq handler; we won't re-enter the driver that way. | |
610 | */ | |
611 | irqreturn_t musb_g_ep0_irq(struct musb *musb) | |
612 | { | |
613 | u16 csr; | |
614 | u16 len; | |
615 | void __iomem *mbase = musb->mregs; | |
616 | void __iomem *regs = musb->endpoints[0].regs; | |
617 | irqreturn_t retval = IRQ_NONE; | |
618 | ||
619 | musb_ep_select(mbase, 0); /* select ep0 */ | |
620 | csr = musb_readw(regs, MUSB_CSR0); | |
621 | len = musb_readb(regs, MUSB_COUNT0); | |
622 | ||
623 | DBG(4, "csr %04x, count %d, myaddr %d, ep0stage %s\n", | |
624 | csr, len, | |
625 | musb_readb(mbase, MUSB_FADDR), | |
626 | decode_ep0stage(musb->ep0_state)); | |
627 | ||
628 | /* I sent a stall.. need to acknowledge it now.. */ | |
629 | if (csr & MUSB_CSR0_P_SENTSTALL) { | |
630 | musb_writew(regs, MUSB_CSR0, | |
631 | csr & ~MUSB_CSR0_P_SENTSTALL); | |
632 | retval = IRQ_HANDLED; | |
a5073b52 | 633 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; |
550a7375 FB |
634 | csr = musb_readw(regs, MUSB_CSR0); |
635 | } | |
636 | ||
637 | /* request ended "early" */ | |
638 | if (csr & MUSB_CSR0_P_SETUPEND) { | |
639 | musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SVDSETUPEND); | |
640 | retval = IRQ_HANDLED; | |
a5073b52 SS |
641 | /* Transition into the early status phase */ |
642 | switch (musb->ep0_state) { | |
643 | case MUSB_EP0_STAGE_TX: | |
644 | musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT; | |
645 | break; | |
646 | case MUSB_EP0_STAGE_RX: | |
647 | musb->ep0_state = MUSB_EP0_STAGE_STATUSIN; | |
648 | break; | |
649 | default: | |
650 | ERR("SetupEnd came in a wrong ep0stage %s", | |
651 | decode_ep0stage(musb->ep0_state)); | |
652 | } | |
550a7375 FB |
653 | csr = musb_readw(regs, MUSB_CSR0); |
654 | /* NOTE: request may need completion */ | |
655 | } | |
656 | ||
657 | /* docs from Mentor only describe tx, rx, and idle/setup states. | |
658 | * we need to handle nuances around status stages, and also the | |
659 | * case where status and setup stages come back-to-back ... | |
660 | */ | |
661 | switch (musb->ep0_state) { | |
662 | ||
663 | case MUSB_EP0_STAGE_TX: | |
664 | /* irq on clearing txpktrdy */ | |
665 | if ((csr & MUSB_CSR0_TXPKTRDY) == 0) { | |
666 | ep0_txstate(musb); | |
667 | retval = IRQ_HANDLED; | |
668 | } | |
669 | break; | |
670 | ||
671 | case MUSB_EP0_STAGE_RX: | |
672 | /* irq on set rxpktrdy */ | |
673 | if (csr & MUSB_CSR0_RXPKTRDY) { | |
674 | ep0_rxstate(musb); | |
675 | retval = IRQ_HANDLED; | |
676 | } | |
677 | break; | |
678 | ||
679 | case MUSB_EP0_STAGE_STATUSIN: | |
680 | /* end of sequence #2 (OUT/RX state) or #3 (no data) */ | |
681 | ||
682 | /* update address (if needed) only @ the end of the | |
683 | * status phase per usb spec, which also guarantees | |
684 | * we get 10 msec to receive this irq... until this | |
685 | * is done we won't see the next packet. | |
686 | */ | |
687 | if (musb->set_address) { | |
688 | musb->set_address = false; | |
689 | musb_writeb(mbase, MUSB_FADDR, musb->address); | |
690 | } | |
691 | ||
692 | /* enter test mode if needed (exit by reset) */ | |
693 | else if (musb->test_mode) { | |
694 | DBG(1, "entering TESTMODE\n"); | |
695 | ||
696 | if (MUSB_TEST_PACKET == musb->test_mode_nr) | |
697 | musb_load_testpacket(musb); | |
698 | ||
699 | musb_writeb(mbase, MUSB_TESTMODE, | |
700 | musb->test_mode_nr); | |
701 | } | |
702 | /* FALLTHROUGH */ | |
703 | ||
704 | case MUSB_EP0_STAGE_STATUSOUT: | |
705 | /* end of sequence #1: write to host (TX state) */ | |
706 | { | |
707 | struct usb_request *req; | |
708 | ||
709 | req = next_ep0_request(musb); | |
710 | if (req) | |
711 | musb_g_ep0_giveback(musb, req); | |
712 | } | |
a5073b52 SS |
713 | |
714 | /* | |
715 | * In case when several interrupts can get coalesced, | |
716 | * check to see if we've already received a SETUP packet... | |
717 | */ | |
718 | if (csr & MUSB_CSR0_RXPKTRDY) | |
719 | goto setup; | |
720 | ||
721 | retval = IRQ_HANDLED; | |
722 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; | |
723 | break; | |
724 | ||
725 | case MUSB_EP0_STAGE_IDLE: | |
726 | /* | |
727 | * This state is typically (but not always) indiscernible | |
728 | * from the status states since the corresponding interrupts | |
729 | * tend to happen within too little period of time (with only | |
730 | * a zero-length packet in between) and so get coalesced... | |
731 | */ | |
550a7375 FB |
732 | retval = IRQ_HANDLED; |
733 | musb->ep0_state = MUSB_EP0_STAGE_SETUP; | |
734 | /* FALLTHROUGH */ | |
735 | ||
736 | case MUSB_EP0_STAGE_SETUP: | |
a5073b52 | 737 | setup: |
550a7375 FB |
738 | if (csr & MUSB_CSR0_RXPKTRDY) { |
739 | struct usb_ctrlrequest setup; | |
740 | int handled = 0; | |
741 | ||
742 | if (len != 8) { | |
743 | ERR("SETUP packet len %d != 8 ?\n", len); | |
744 | break; | |
745 | } | |
746 | musb_read_setup(musb, &setup); | |
747 | retval = IRQ_HANDLED; | |
748 | ||
749 | /* sometimes the RESET won't be reported */ | |
750 | if (unlikely(musb->g.speed == USB_SPEED_UNKNOWN)) { | |
751 | u8 power; | |
752 | ||
753 | printk(KERN_NOTICE "%s: peripheral reset " | |
754 | "irq lost!\n", | |
755 | musb_driver_name); | |
756 | power = musb_readb(mbase, MUSB_POWER); | |
757 | musb->g.speed = (power & MUSB_POWER_HSMODE) | |
758 | ? USB_SPEED_HIGH : USB_SPEED_FULL; | |
759 | ||
760 | } | |
761 | ||
762 | switch (musb->ep0_state) { | |
763 | ||
764 | /* sequence #3 (no data stage), includes requests | |
765 | * we can't forward (notably SET_ADDRESS and the | |
766 | * device/endpoint feature set/clear operations) | |
767 | * plus SET_CONFIGURATION and others we must | |
768 | */ | |
769 | case MUSB_EP0_STAGE_ACKWAIT: | |
770 | handled = service_zero_data_request( | |
771 | musb, &setup); | |
772 | ||
773 | /* status stage might be immediate */ | |
774 | if (handled > 0) { | |
775 | musb->ackpend |= MUSB_CSR0_P_DATAEND; | |
776 | musb->ep0_state = | |
777 | MUSB_EP0_STAGE_STATUSIN; | |
778 | } | |
779 | break; | |
780 | ||
781 | /* sequence #1 (IN to host), includes GET_STATUS | |
782 | * requests that we can't forward, GET_DESCRIPTOR | |
783 | * and others that we must | |
784 | */ | |
785 | case MUSB_EP0_STAGE_TX: | |
786 | handled = service_in_request(musb, &setup); | |
787 | if (handled > 0) { | |
788 | musb->ackpend = MUSB_CSR0_TXPKTRDY | |
789 | | MUSB_CSR0_P_DATAEND; | |
790 | musb->ep0_state = | |
791 | MUSB_EP0_STAGE_STATUSOUT; | |
792 | } | |
793 | break; | |
794 | ||
795 | /* sequence #2 (OUT from host), always forward */ | |
796 | default: /* MUSB_EP0_STAGE_RX */ | |
797 | break; | |
798 | } | |
799 | ||
800 | DBG(3, "handled %d, csr %04x, ep0stage %s\n", | |
801 | handled, csr, | |
802 | decode_ep0stage(musb->ep0_state)); | |
803 | ||
804 | /* unless we need to delegate this to the gadget | |
805 | * driver, we know how to wrap this up: csr0 has | |
806 | * not yet been written. | |
807 | */ | |
808 | if (handled < 0) | |
809 | goto stall; | |
810 | else if (handled > 0) | |
811 | goto finish; | |
812 | ||
813 | handled = forward_to_driver(musb, &setup); | |
814 | if (handled < 0) { | |
815 | musb_ep_select(mbase, 0); | |
816 | stall: | |
817 | DBG(3, "stall (%d)\n", handled); | |
818 | musb->ackpend |= MUSB_CSR0_P_SENDSTALL; | |
a5073b52 | 819 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; |
550a7375 FB |
820 | finish: |
821 | musb_writew(regs, MUSB_CSR0, | |
822 | musb->ackpend); | |
823 | musb->ackpend = 0; | |
824 | } | |
825 | } | |
826 | break; | |
827 | ||
828 | case MUSB_EP0_STAGE_ACKWAIT: | |
829 | /* This should not happen. But happens with tusb6010 with | |
830 | * g_file_storage and high speed. Do nothing. | |
831 | */ | |
832 | retval = IRQ_HANDLED; | |
833 | break; | |
834 | ||
835 | default: | |
836 | /* "can't happen" */ | |
837 | WARN_ON(1); | |
838 | musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SENDSTALL); | |
a5073b52 | 839 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; |
550a7375 FB |
840 | break; |
841 | } | |
842 | ||
843 | return retval; | |
844 | } | |
845 | ||
846 | ||
847 | static int | |
848 | musb_g_ep0_enable(struct usb_ep *ep, const struct usb_endpoint_descriptor *desc) | |
849 | { | |
850 | /* always enabled */ | |
851 | return -EINVAL; | |
852 | } | |
853 | ||
854 | static int musb_g_ep0_disable(struct usb_ep *e) | |
855 | { | |
856 | /* always enabled */ | |
857 | return -EINVAL; | |
858 | } | |
859 | ||
860 | static int | |
861 | musb_g_ep0_queue(struct usb_ep *e, struct usb_request *r, gfp_t gfp_flags) | |
862 | { | |
863 | struct musb_ep *ep; | |
864 | struct musb_request *req; | |
865 | struct musb *musb; | |
866 | int status; | |
867 | unsigned long lockflags; | |
868 | void __iomem *regs; | |
869 | ||
870 | if (!e || !r) | |
871 | return -EINVAL; | |
872 | ||
873 | ep = to_musb_ep(e); | |
874 | musb = ep->musb; | |
875 | regs = musb->control_ep->regs; | |
876 | ||
877 | req = to_musb_request(r); | |
878 | req->musb = musb; | |
879 | req->request.actual = 0; | |
880 | req->request.status = -EINPROGRESS; | |
881 | req->tx = ep->is_in; | |
882 | ||
883 | spin_lock_irqsave(&musb->lock, lockflags); | |
884 | ||
885 | if (!list_empty(&ep->req_list)) { | |
886 | status = -EBUSY; | |
887 | goto cleanup; | |
888 | } | |
889 | ||
890 | switch (musb->ep0_state) { | |
891 | case MUSB_EP0_STAGE_RX: /* control-OUT data */ | |
892 | case MUSB_EP0_STAGE_TX: /* control-IN data */ | |
893 | case MUSB_EP0_STAGE_ACKWAIT: /* zero-length data */ | |
894 | status = 0; | |
895 | break; | |
896 | default: | |
897 | DBG(1, "ep0 request queued in state %d\n", | |
898 | musb->ep0_state); | |
899 | status = -EINVAL; | |
900 | goto cleanup; | |
901 | } | |
902 | ||
903 | /* add request to the list */ | |
904 | list_add_tail(&(req->request.list), &(ep->req_list)); | |
905 | ||
906 | DBG(3, "queue to %s (%s), length=%d\n", | |
907 | ep->name, ep->is_in ? "IN/TX" : "OUT/RX", | |
908 | req->request.length); | |
909 | ||
910 | musb_ep_select(musb->mregs, 0); | |
911 | ||
912 | /* sequence #1, IN ... start writing the data */ | |
913 | if (musb->ep0_state == MUSB_EP0_STAGE_TX) | |
914 | ep0_txstate(musb); | |
915 | ||
916 | /* sequence #3, no-data ... issue IN status */ | |
917 | else if (musb->ep0_state == MUSB_EP0_STAGE_ACKWAIT) { | |
918 | if (req->request.length) | |
919 | status = -EINVAL; | |
920 | else { | |
921 | musb->ep0_state = MUSB_EP0_STAGE_STATUSIN; | |
922 | musb_writew(regs, MUSB_CSR0, | |
923 | musb->ackpend | MUSB_CSR0_P_DATAEND); | |
924 | musb->ackpend = 0; | |
925 | musb_g_ep0_giveback(ep->musb, r); | |
926 | } | |
927 | ||
928 | /* else for sequence #2 (OUT), caller provides a buffer | |
929 | * before the next packet arrives. deferred responses | |
930 | * (after SETUP is acked) are racey. | |
931 | */ | |
932 | } else if (musb->ackpend) { | |
933 | musb_writew(regs, MUSB_CSR0, musb->ackpend); | |
934 | musb->ackpend = 0; | |
935 | } | |
936 | ||
937 | cleanup: | |
938 | spin_unlock_irqrestore(&musb->lock, lockflags); | |
939 | return status; | |
940 | } | |
941 | ||
942 | static int musb_g_ep0_dequeue(struct usb_ep *ep, struct usb_request *req) | |
943 | { | |
944 | /* we just won't support this */ | |
945 | return -EINVAL; | |
946 | } | |
947 | ||
948 | static int musb_g_ep0_halt(struct usb_ep *e, int value) | |
949 | { | |
950 | struct musb_ep *ep; | |
951 | struct musb *musb; | |
952 | void __iomem *base, *regs; | |
953 | unsigned long flags; | |
954 | int status; | |
955 | u16 csr; | |
956 | ||
957 | if (!e || !value) | |
958 | return -EINVAL; | |
959 | ||
960 | ep = to_musb_ep(e); | |
961 | musb = ep->musb; | |
962 | base = musb->mregs; | |
963 | regs = musb->control_ep->regs; | |
964 | status = 0; | |
965 | ||
966 | spin_lock_irqsave(&musb->lock, flags); | |
967 | ||
968 | if (!list_empty(&ep->req_list)) { | |
969 | status = -EBUSY; | |
970 | goto cleanup; | |
971 | } | |
972 | ||
973 | musb_ep_select(base, 0); | |
974 | csr = musb->ackpend; | |
975 | ||
976 | switch (musb->ep0_state) { | |
977 | ||
978 | /* Stalls are usually issued after parsing SETUP packet, either | |
979 | * directly in irq context from setup() or else later. | |
980 | */ | |
981 | case MUSB_EP0_STAGE_TX: /* control-IN data */ | |
982 | case MUSB_EP0_STAGE_ACKWAIT: /* STALL for zero-length data */ | |
983 | case MUSB_EP0_STAGE_RX: /* control-OUT data */ | |
984 | csr = musb_readw(regs, MUSB_CSR0); | |
985 | /* FALLTHROUGH */ | |
986 | ||
987 | /* It's also OK to issue stalls during callbacks when a non-empty | |
988 | * DATA stage buffer has been read (or even written). | |
989 | */ | |
990 | case MUSB_EP0_STAGE_STATUSIN: /* control-OUT status */ | |
991 | case MUSB_EP0_STAGE_STATUSOUT: /* control-IN status */ | |
992 | ||
993 | csr |= MUSB_CSR0_P_SENDSTALL; | |
994 | musb_writew(regs, MUSB_CSR0, csr); | |
a5073b52 | 995 | musb->ep0_state = MUSB_EP0_STAGE_IDLE; |
550a7375 FB |
996 | musb->ackpend = 0; |
997 | break; | |
998 | default: | |
999 | DBG(1, "ep0 can't halt in state %d\n", musb->ep0_state); | |
1000 | status = -EINVAL; | |
1001 | } | |
1002 | ||
1003 | cleanup: | |
1004 | spin_unlock_irqrestore(&musb->lock, flags); | |
1005 | return status; | |
1006 | } | |
1007 | ||
1008 | const struct usb_ep_ops musb_g_ep0_ops = { | |
1009 | .enable = musb_g_ep0_enable, | |
1010 | .disable = musb_g_ep0_disable, | |
1011 | .alloc_request = musb_alloc_request, | |
1012 | .free_request = musb_free_request, | |
1013 | .queue = musb_g_ep0_queue, | |
1014 | .dequeue = musb_g_ep0_dequeue, | |
1015 | .set_halt = musb_g_ep0_halt, | |
1016 | }; |