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Adds a nolock function to the w1 interface to avoid locking the
[linux-2.6/next.git] / drivers / usb / musb / musb_gadget_ep0.c
blob9378b359c1f012d6abcacd358b7366bcafb32912
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
7 * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
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) {
62 case MUSB_EP0_STAGE_IDLE: return "idle";
63 case MUSB_EP0_STAGE_SETUP: return "setup";
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 if (musb->g.is_otg) {
92 result[0] |= musb->g.b_hnp_enable
93 << USB_DEVICE_B_HNP_ENABLE;
94 result[0] |= musb->g.a_alt_hnp_support
95 << USB_DEVICE_A_ALT_HNP_SUPPORT;
96 result[0] |= musb->g.a_hnp_support
97 << USB_DEVICE_A_HNP_SUPPORT;
98 }
99 break;
100
101 case USB_RECIP_INTERFACE:
102 result[0] = 0;
103 break;
104
105 case USB_RECIP_ENDPOINT: {
106 int is_in;
107 struct musb_ep *ep;
108 u16 tmp;
109 void __iomem *regs;
110
111 epnum = (u8) ctrlrequest->wIndex;
112 if (!epnum) {
113 result[0] = 0;
114 break;
115 }
116
117 is_in = epnum & USB_DIR_IN;
118 if (is_in) {
119 epnum &= 0x0f;
120 ep = &musb->endpoints[epnum].ep_in;
121 } else {
122 ep = &musb->endpoints[epnum].ep_out;
123 }
124 regs = musb->endpoints[epnum].regs;
125
126 if (epnum >= MUSB_C_NUM_EPS || !ep->desc) {
127 handled = -EINVAL;
128 break;
129 }
130
131 musb_ep_select(mbase, epnum);
132 if (is_in)
133 tmp = musb_readw(regs, MUSB_TXCSR)
134 & MUSB_TXCSR_P_SENDSTALL;
135 else
136 tmp = musb_readw(regs, MUSB_RXCSR)
137 & MUSB_RXCSR_P_SENDSTALL;
138 musb_ep_select(mbase, 0);
139
140 result[0] = tmp ? 1 : 0;
141 } break;
142
143 default:
144 /* class, vendor, etc ... delegate */
145 handled = 0;
146 break;
147 }
148
149 /* fill up the fifo; caller updates csr0 */
150 if (handled > 0) {
151 u16 len = le16_to_cpu(ctrlrequest->wLength);
152
153 if (len > 2)
154 len = 2;
155 musb_write_fifo(&musb->endpoints[0], len, result);
156 }
157
158 return handled;
159 }
160
161 /*
162 * handle a control-IN request, the end0 buffer contains the current request
163 * that is supposed to be a standard control request. Assumes the fifo to
164 * be at least 2 bytes long.
165 *
166 * @return 0 if the request was NOT HANDLED,
167 * < 0 when error
168 * > 0 when the request is processed
169 *
170 * Context: caller holds controller lock
171 */
172 static int
173 service_in_request(struct musb *musb, const struct usb_ctrlrequest *ctrlrequest)
174 {
175 int handled = 0; /* not handled */
176
177 if ((ctrlrequest->bRequestType & USB_TYPE_MASK)
178 == USB_TYPE_STANDARD) {
179 switch (ctrlrequest->bRequest) {
180 case USB_REQ_GET_STATUS:
181 handled = service_tx_status_request(musb,
182 ctrlrequest);
183 break;
184
185 /* case USB_REQ_SYNC_FRAME: */
186
187 default:
188 break;
189 }
190 }
191 return handled;
192 }
193
194 /*
195 * Context: caller holds controller lock
196 */
197 static void musb_g_ep0_giveback(struct musb *musb, struct usb_request *req)
198 {
199 musb_g_giveback(&musb->endpoints[0].ep_in, req, 0);
200 }
201
202 /*
203 * Tries to start B-device HNP negotiation if enabled via sysfs
204 */
205 static inline void musb_try_b_hnp_enable(struct musb *musb)
206 {
207 void __iomem *mbase = musb->mregs;
208 u8 devctl;
209
210 dev_dbg(musb->controller, "HNP: Setting HR\n");
211 devctl = musb_readb(mbase, MUSB_DEVCTL);
212 musb_writeb(mbase, MUSB_DEVCTL, devctl | MUSB_DEVCTL_HR);
213 }
214
215 /*
216 * Handle all control requests with no DATA stage, including standard
217 * requests such as:
218 * USB_REQ_SET_CONFIGURATION, USB_REQ_SET_INTERFACE, unrecognized
219 * always delegated to the gadget driver
220 * USB_REQ_SET_ADDRESS, USB_REQ_CLEAR_FEATURE, USB_REQ_SET_FEATURE
221 * always handled here, except for class/vendor/... features
222 *
223 * Context: caller holds controller lock
224 */
225 static int
226 service_zero_data_request(struct musb *musb,
227 struct usb_ctrlrequest *ctrlrequest)
228 __releases(musb->lock)
229 __acquires(musb->lock)
230 {
231 int handled = -EINVAL;
232 void __iomem *mbase = musb->mregs;
233 const u8 recip = ctrlrequest->bRequestType & USB_RECIP_MASK;
234
235 /* the gadget driver handles everything except what we MUST handle */
236 if ((ctrlrequest->bRequestType & USB_TYPE_MASK)
237 == USB_TYPE_STANDARD) {
238 switch (ctrlrequest->bRequest) {
239 case USB_REQ_SET_ADDRESS:
240 /* change it after the status stage */
241 musb->set_address = true;
242 musb->address = (u8) (ctrlrequest->wValue & 0x7f);
243 handled = 1;
244 break;
245
246 case USB_REQ_CLEAR_FEATURE:
247 switch (recip) {
248 case USB_RECIP_DEVICE:
249 if (ctrlrequest->wValue
250 != USB_DEVICE_REMOTE_WAKEUP)
251 break;
252 musb->may_wakeup = 0;
253 handled = 1;
254 break;
255 case USB_RECIP_INTERFACE:
256 break;
257 case USB_RECIP_ENDPOINT:{
258 const u8 epnum =
259 ctrlrequest->wIndex & 0x0f;
260 struct musb_ep *musb_ep;
261 struct musb_hw_ep *ep;
262 struct musb_request *request;
263 void __iomem *regs;
264 int is_in;
265 u16 csr;
266
267 if (epnum == 0 || epnum >= MUSB_C_NUM_EPS ||
268 ctrlrequest->wValue != USB_ENDPOINT_HALT)
269 break;
270
271 ep = musb->endpoints + epnum;
272 regs = ep->regs;
273 is_in = ctrlrequest->wIndex & USB_DIR_IN;
274 if (is_in)
275 musb_ep = &ep->ep_in;
276 else
277 musb_ep = &ep->ep_out;
278 if (!musb_ep->desc)
279 break;
280
281 handled = 1;
282 /* Ignore request if endpoint is wedged */
283 if (musb_ep->wedged)
284 break;
285
286 musb_ep_select(mbase, epnum);
287 if (is_in) {
288 csr = musb_readw(regs, MUSB_TXCSR);
289 csr |= MUSB_TXCSR_CLRDATATOG |
290 MUSB_TXCSR_P_WZC_BITS;
291 csr &= ~(MUSB_TXCSR_P_SENDSTALL |
292 MUSB_TXCSR_P_SENTSTALL |
293 MUSB_TXCSR_TXPKTRDY);
294 musb_writew(regs, MUSB_TXCSR, csr);
295 } else {
296 csr = musb_readw(regs, MUSB_RXCSR);
297 csr |= MUSB_RXCSR_CLRDATATOG |
298 MUSB_RXCSR_P_WZC_BITS;
299 csr &= ~(MUSB_RXCSR_P_SENDSTALL |
300 MUSB_RXCSR_P_SENTSTALL);
301 musb_writew(regs, MUSB_RXCSR, csr);
302 }
303
304 /* Maybe start the first request in the queue */
305 request = next_request(musb_ep);
306 if (!musb_ep->busy && request) {
307 dev_dbg(musb->controller, "restarting the request\n");
308 musb_ep_restart(musb, request);
309 }
310
311 /* select ep0 again */
312 musb_ep_select(mbase, 0);
313 } break;
314 default:
315 /* class, vendor, etc ... delegate */
316 handled = 0;
317 break;
318 }
319 break;
320
321 case USB_REQ_SET_FEATURE:
322 switch (recip) {
323 case USB_RECIP_DEVICE:
324 handled = 1;
325 switch (ctrlrequest->wValue) {
326 case USB_DEVICE_REMOTE_WAKEUP:
327 musb->may_wakeup = 1;
328 break;
329 case USB_DEVICE_TEST_MODE:
330 if (musb->g.speed != USB_SPEED_HIGH)
331 goto stall;
332 if (ctrlrequest->wIndex & 0xff)
333 goto stall;
334
335 switch (ctrlrequest->wIndex >> 8) {
336 case 1:
337 pr_debug("TEST_J\n");
338 /* TEST_J */
339 musb->test_mode_nr =
340 MUSB_TEST_J;
341 break;
342 case 2:
343 /* TEST_K */
344 pr_debug("TEST_K\n");
345 musb->test_mode_nr =
346 MUSB_TEST_K;
347 break;
348 case 3:
349 /* TEST_SE0_NAK */
350 pr_debug("TEST_SE0_NAK\n");
351 musb->test_mode_nr =
352 MUSB_TEST_SE0_NAK;
353 break;
354 case 4:
355 /* TEST_PACKET */
356 pr_debug("TEST_PACKET\n");
357 musb->test_mode_nr =
358 MUSB_TEST_PACKET;
359 break;
360
361 case 0xc0:
362 /* TEST_FORCE_HS */
363 pr_debug("TEST_FORCE_HS\n");
364 musb->test_mode_nr =
365 MUSB_TEST_FORCE_HS;
366 break;
367 case 0xc1:
368 /* TEST_FORCE_FS */
369 pr_debug("TEST_FORCE_FS\n");
370 musb->test_mode_nr =
371 MUSB_TEST_FORCE_FS;
372 break;
373 case 0xc2:
374 /* TEST_FIFO_ACCESS */
375 pr_debug("TEST_FIFO_ACCESS\n");
376 musb->test_mode_nr =
377 MUSB_TEST_FIFO_ACCESS;
378 break;
379 case 0xc3:
380 /* TEST_FORCE_HOST */
381 pr_debug("TEST_FORCE_HOST\n");
382 musb->test_mode_nr =
383 MUSB_TEST_FORCE_HOST;
384 break;
385 default:
386 goto stall;
387 }
388
389 /* enter test mode after irq */
390 if (handled > 0)
391 musb->test_mode = true;
392 break;
393 case USB_DEVICE_B_HNP_ENABLE:
394 if (!musb->g.is_otg)
395 goto stall;
396 musb->g.b_hnp_enable = 1;
397 musb_try_b_hnp_enable(musb);
398 break;
399 case USB_DEVICE_A_HNP_SUPPORT:
400 if (!musb->g.is_otg)
401 goto stall;
402 musb->g.a_hnp_support = 1;
403 break;
404 case USB_DEVICE_A_ALT_HNP_SUPPORT:
405 if (!musb->g.is_otg)
406 goto stall;
407 musb->g.a_alt_hnp_support = 1;
408 break;
409 case USB_DEVICE_DEBUG_MODE:
410 handled = 0;
411 break;
412 stall:
413 default:
414 handled = -EINVAL;
415 break;
416 }
417 break;
418
419 case USB_RECIP_INTERFACE:
420 break;
421
422 case USB_RECIP_ENDPOINT:{
423 const u8 epnum =
424 ctrlrequest->wIndex & 0x0f;
425 struct musb_ep *musb_ep;
426 struct musb_hw_ep *ep;
427 void __iomem *regs;
428 int is_in;
429 u16 csr;
430
431 if (epnum == 0 || epnum >= MUSB_C_NUM_EPS ||
432 ctrlrequest->wValue != USB_ENDPOINT_HALT)
433 break;
434
435 ep = musb->endpoints + epnum;
436 regs = ep->regs;
437 is_in = ctrlrequest->wIndex & USB_DIR_IN;
438 if (is_in)
439 musb_ep = &ep->ep_in;
440 else
441 musb_ep = &ep->ep_out;
442 if (!musb_ep->desc)
443 break;
444
445 musb_ep_select(mbase, epnum);
446 if (is_in) {
447 csr = musb_readw(regs, MUSB_TXCSR);
448 if (csr & MUSB_TXCSR_FIFONOTEMPTY)
449 csr |= MUSB_TXCSR_FLUSHFIFO;
450 csr |= MUSB_TXCSR_P_SENDSTALL
451 | MUSB_TXCSR_CLRDATATOG
452 | MUSB_TXCSR_P_WZC_BITS;
453 musb_writew(regs, MUSB_TXCSR, csr);
454 } else {
455 csr = musb_readw(regs, MUSB_RXCSR);
456 csr |= MUSB_RXCSR_P_SENDSTALL
457 | MUSB_RXCSR_FLUSHFIFO
458 | MUSB_RXCSR_CLRDATATOG
459 | MUSB_RXCSR_P_WZC_BITS;
460 musb_writew(regs, MUSB_RXCSR, csr);
461 }
462
463 /* select ep0 again */
464 musb_ep_select(mbase, 0);
465 handled = 1;
466 } break;
467
468 default:
469 /* class, vendor, etc ... delegate */
470 handled = 0;
471 break;
472 }
473 break;
474 default:
475 /* delegate SET_CONFIGURATION, etc */
476 handled = 0;
477 }
478 } else
479 handled = 0;
480 return handled;
481 }
482
483 /* we have an ep0out data packet
484 * Context: caller holds controller lock
485 */
486 static void ep0_rxstate(struct musb *musb)
487 {
488 void __iomem *regs = musb->control_ep->regs;
489 struct musb_request *request;
490 struct usb_request *req;
491 u16 count, csr;
492
493 request = next_ep0_request(musb);
494 req = &request->request;
495
496 /* read packet and ack; or stall because of gadget driver bug:
497 * should have provided the rx buffer before setup() returned.
498 */
499 if (req) {
500 void *buf = req->buf + req->actual;
501 unsigned len = req->length - req->actual;
502
503 /* read the buffer */
504 count = musb_readb(regs, MUSB_COUNT0);
505 if (count > len) {
506 req->status = -EOVERFLOW;
507 count = len;
508 }
509 musb_read_fifo(&musb->endpoints[0], count, buf);
510 req->actual += count;
511 csr = MUSB_CSR0_P_SVDRXPKTRDY;
512 if (count < 64 || req->actual == req->length) {
513 musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;
514 csr |= MUSB_CSR0_P_DATAEND;
515 } else
516 req = NULL;
517 } else
518 csr = MUSB_CSR0_P_SVDRXPKTRDY | MUSB_CSR0_P_SENDSTALL;
519
520
521 /* Completion handler may choose to stall, e.g. because the
522 * message just received holds invalid data.
523 */
524 if (req) {
525 musb->ackpend = csr;
526 musb_g_ep0_giveback(musb, req);
527 if (!musb->ackpend)
528 return;
529 musb->ackpend = 0;
530 }
531 musb_ep_select(musb->mregs, 0);
532 musb_writew(regs, MUSB_CSR0, csr);
533 }
534
535 /*
536 * transmitting to the host (IN), this code might be called from IRQ
537 * and from kernel thread.
538 *
539 * Context: caller holds controller lock
540 */
541 static void ep0_txstate(struct musb *musb)
542 {
543 void __iomem *regs = musb->control_ep->regs;
544 struct musb_request *req = next_ep0_request(musb);
545 struct usb_request *request;
546 u16 csr = MUSB_CSR0_TXPKTRDY;
547 u8 *fifo_src;
548 u8 fifo_count;
549
550 if (!req) {
551 /* WARN_ON(1); */
552 dev_dbg(musb->controller, "odd; csr0 %04x\n", musb_readw(regs, MUSB_CSR0));
553 return;
554 }
555
556 request = &req->request;
557
558 /* load the data */
559 fifo_src = (u8 *) request->buf + request->actual;
560 fifo_count = min((unsigned) MUSB_EP0_FIFOSIZE,
561 request->length - request->actual);
562 musb_write_fifo(&musb->endpoints[0], fifo_count, fifo_src);
563 request->actual += fifo_count;
564
565 /* update the flags */
566 if (fifo_count < MUSB_MAX_END0_PACKET
567 || (request->actual == request->length
568 && !request->zero)) {
569 musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT;
570 csr |= MUSB_CSR0_P_DATAEND;
571 } else
572 request = NULL;
573
574 /* report completions as soon as the fifo's loaded; there's no
575 * win in waiting till this last packet gets acked. (other than
576 * very precise fault reporting, needed by USB TMC; possible with
577 * this hardware, but not usable from portable gadget drivers.)
578 */
579 if (request) {
580 musb->ackpend = csr;
581 musb_g_ep0_giveback(musb, request);
582 if (!musb->ackpend)
583 return;
584 musb->ackpend = 0;
585 }
586
587 /* send it out, triggering a "txpktrdy cleared" irq */
588 musb_ep_select(musb->mregs, 0);
589 musb_writew(regs, MUSB_CSR0, csr);
590 }
591
592 /*
593 * Read a SETUP packet (struct usb_ctrlrequest) from the hardware.
594 * Fields are left in USB byte-order.
595 *
596 * Context: caller holds controller lock.
597 */
598 static void
599 musb_read_setup(struct musb *musb, struct usb_ctrlrequest *req)
600 {
601 struct musb_request *r;
602 void __iomem *regs = musb->control_ep->regs;
603
604 musb_read_fifo(&musb->endpoints[0], sizeof *req, (u8 *)req);
605
606 /* NOTE: earlier 2.6 versions changed setup packets to host
607 * order, but now USB packets always stay in USB byte order.
608 */
609 dev_dbg(musb->controller, "SETUP req%02x.%02x v%04x i%04x l%d\n",
610 req->bRequestType,
611 req->bRequest,
612 le16_to_cpu(req->wValue),
613 le16_to_cpu(req->wIndex),
614 le16_to_cpu(req->wLength));
615
616 /* clean up any leftover transfers */
617 r = next_ep0_request(musb);
618 if (r)
619 musb_g_ep0_giveback(musb, &r->request);
620
621 /* For zero-data requests we want to delay the STATUS stage to
622 * avoid SETUPEND errors. If we read data (OUT), delay accepting
623 * packets until there's a buffer to store them in.
624 *
625 * If we write data, the controller acts happier if we enable
626 * the TX FIFO right away, and give the controller a moment
627 * to switch modes...
628 */
629 musb->set_address = false;
630 musb->ackpend = MUSB_CSR0_P_SVDRXPKTRDY;
631 if (req->wLength == 0) {
632 if (req->bRequestType & USB_DIR_IN)
633 musb->ackpend |= MUSB_CSR0_TXPKTRDY;
634 musb->ep0_state = MUSB_EP0_STAGE_ACKWAIT;
635 } else if (req->bRequestType & USB_DIR_IN) {
636 musb->ep0_state = MUSB_EP0_STAGE_TX;
637 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SVDRXPKTRDY);
638 while ((musb_readw(regs, MUSB_CSR0)
639 & MUSB_CSR0_RXPKTRDY) != 0)
640 cpu_relax();
641 musb->ackpend = 0;
642 } else
643 musb->ep0_state = MUSB_EP0_STAGE_RX;
644 }
645
646 static int
647 forward_to_driver(struct musb *musb, const struct usb_ctrlrequest *ctrlrequest)
648 __releases(musb->lock)
649 __acquires(musb->lock)
650 {
651 int retval;
652 if (!musb->gadget_driver)
653 return -EOPNOTSUPP;
654 spin_unlock(&musb->lock);
655 retval = musb->gadget_driver->setup(&musb->g, ctrlrequest);
656 spin_lock(&musb->lock);
657 return retval;
658 }
659
660 /*
661 * Handle peripheral ep0 interrupt
662 *
663 * Context: irq handler; we won't re-enter the driver that way.
664 */
665 irqreturn_t musb_g_ep0_irq(struct musb *musb)
666 {
667 u16 csr;
668 u16 len;
669 void __iomem *mbase = musb->mregs;
670 void __iomem *regs = musb->endpoints[0].regs;
671 irqreturn_t retval = IRQ_NONE;
672
673 musb_ep_select(mbase, 0); /* select ep0 */
674 csr = musb_readw(regs, MUSB_CSR0);
675 len = musb_readb(regs, MUSB_COUNT0);
676
677 dev_dbg(musb->controller, "csr %04x, count %d, myaddr %d, ep0stage %s\n",
678 csr, len,
679 musb_readb(mbase, MUSB_FADDR),
680 decode_ep0stage(musb->ep0_state));
681
682 /* I sent a stall.. need to acknowledge it now.. */
683 if (csr & MUSB_CSR0_P_SENTSTALL) {
684 musb_writew(regs, MUSB_CSR0,
685 csr & ~MUSB_CSR0_P_SENTSTALL);
686 retval = IRQ_HANDLED;
687 musb->ep0_state = MUSB_EP0_STAGE_IDLE;
688 csr = musb_readw(regs, MUSB_CSR0);
689 }
690
691 /* request ended "early" */
692 if (csr & MUSB_CSR0_P_SETUPEND) {
693 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SVDSETUPEND);
694 retval = IRQ_HANDLED;
695 /* Transition into the early status phase */
696 switch (musb->ep0_state) {
697 case MUSB_EP0_STAGE_TX:
698 musb->ep0_state = MUSB_EP0_STAGE_STATUSOUT;
699 break;
700 case MUSB_EP0_STAGE_RX:
701 musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;
702 break;
703 default:
704 ERR("SetupEnd came in a wrong ep0stage %s\n",
705 decode_ep0stage(musb->ep0_state));
706 }
707 csr = musb_readw(regs, MUSB_CSR0);
708 /* NOTE: request may need completion */
709 }
710
711 /* docs from Mentor only describe tx, rx, and idle/setup states.
712 * we need to handle nuances around status stages, and also the
713 * case where status and setup stages come back-to-back ...
714 */
715 switch (musb->ep0_state) {
716
717 case MUSB_EP0_STAGE_TX:
718 /* irq on clearing txpktrdy */
719 if ((csr & MUSB_CSR0_TXPKTRDY) == 0) {
720 ep0_txstate(musb);
721 retval = IRQ_HANDLED;
722 }
723 break;
724
725 case MUSB_EP0_STAGE_RX:
726 /* irq on set rxpktrdy */
727 if (csr & MUSB_CSR0_RXPKTRDY) {
728 ep0_rxstate(musb);
729 retval = IRQ_HANDLED;
730 }
731 break;
732
733 case MUSB_EP0_STAGE_STATUSIN:
734 /* end of sequence #2 (OUT/RX state) or #3 (no data) */
735
736 /* update address (if needed) only @ the end of the
737 * status phase per usb spec, which also guarantees
738 * we get 10 msec to receive this irq... until this
739 * is done we won't see the next packet.
740 */
741 if (musb->set_address) {
742 musb->set_address = false;
743 musb_writeb(mbase, MUSB_FADDR, musb->address);
744 }
745
746 /* enter test mode if needed (exit by reset) */
747 else if (musb->test_mode) {
748 dev_dbg(musb->controller, "entering TESTMODE\n");
749
750 if (MUSB_TEST_PACKET == musb->test_mode_nr)
751 musb_load_testpacket(musb);
752
753 musb_writeb(mbase, MUSB_TESTMODE,
754 musb->test_mode_nr);
755 }
756 /* FALLTHROUGH */
757
758 case MUSB_EP0_STAGE_STATUSOUT:
759 /* end of sequence #1: write to host (TX state) */
760 {
761 struct musb_request *req;
762
763 req = next_ep0_request(musb);
764 if (req)
765 musb_g_ep0_giveback(musb, &req->request);
766 }
767
768 /*
769 * In case when several interrupts can get coalesced,
770 * check to see if we've already received a SETUP packet...
771 */
772 if (csr & MUSB_CSR0_RXPKTRDY)
773 goto setup;
774
775 retval = IRQ_HANDLED;
776 musb->ep0_state = MUSB_EP0_STAGE_IDLE;
777 break;
778
779 case MUSB_EP0_STAGE_IDLE:
780 /*
781 * This state is typically (but not always) indiscernible
782 * from the status states since the corresponding interrupts
783 * tend to happen within too little period of time (with only
784 * a zero-length packet in between) and so get coalesced...
785 */
786 retval = IRQ_HANDLED;
787 musb->ep0_state = MUSB_EP0_STAGE_SETUP;
788 /* FALLTHROUGH */
789
790 case MUSB_EP0_STAGE_SETUP:
791 setup:
792 if (csr & MUSB_CSR0_RXPKTRDY) {
793 struct usb_ctrlrequest setup;
794 int handled = 0;
795
796 if (len != 8) {
797 ERR("SETUP packet len %d != 8 ?\n", len);
798 break;
799 }
800 musb_read_setup(musb, &setup);
801 retval = IRQ_HANDLED;
802
803 /* sometimes the RESET won't be reported */
804 if (unlikely(musb->g.speed == USB_SPEED_UNKNOWN)) {
805 u8 power;
806
807 printk(KERN_NOTICE "%s: peripheral reset "
808 "irq lost!\n",
809 musb_driver_name);
810 power = musb_readb(mbase, MUSB_POWER);
811 musb->g.speed = (power & MUSB_POWER_HSMODE)
812 ? USB_SPEED_HIGH : USB_SPEED_FULL;
813
814 }
815
816 switch (musb->ep0_state) {
817
818 /* sequence #3 (no data stage), includes requests
819 * we can't forward (notably SET_ADDRESS and the
820 * device/endpoint feature set/clear operations)
821 * plus SET_CONFIGURATION and others we must
822 */
823 case MUSB_EP0_STAGE_ACKWAIT:
824 handled = service_zero_data_request(
825 musb, &setup);
826
827 /*
828 * We're expecting no data in any case, so
829 * always set the DATAEND bit -- doing this
830 * here helps avoid SetupEnd interrupt coming
831 * in the idle stage when we're stalling...
832 */
833 musb->ackpend |= MUSB_CSR0_P_DATAEND;
834
835 /* status stage might be immediate */
836 if (handled > 0)
837 musb->ep0_state =
838 MUSB_EP0_STAGE_STATUSIN;
839 break;
840
841 /* sequence #1 (IN to host), includes GET_STATUS
842 * requests that we can't forward, GET_DESCRIPTOR
843 * and others that we must
844 */
845 case MUSB_EP0_STAGE_TX:
846 handled = service_in_request(musb, &setup);
847 if (handled > 0) {
848 musb->ackpend = MUSB_CSR0_TXPKTRDY
849 | MUSB_CSR0_P_DATAEND;
850 musb->ep0_state =
851 MUSB_EP0_STAGE_STATUSOUT;
852 }
853 break;
854
855 /* sequence #2 (OUT from host), always forward */
856 default: /* MUSB_EP0_STAGE_RX */
857 break;
858 }
859
860 dev_dbg(musb->controller, "handled %d, csr %04x, ep0stage %s\n",
861 handled, csr,
862 decode_ep0stage(musb->ep0_state));
863
864 /* unless we need to delegate this to the gadget
865 * driver, we know how to wrap this up: csr0 has
866 * not yet been written.
867 */
868 if (handled < 0)
869 goto stall;
870 else if (handled > 0)
871 goto finish;
872
873 handled = forward_to_driver(musb, &setup);
874 if (handled < 0) {
875 musb_ep_select(mbase, 0);
876 stall:
877 dev_dbg(musb->controller, "stall (%d)\n", handled);
878 musb->ackpend |= MUSB_CSR0_P_SENDSTALL;
879 musb->ep0_state = MUSB_EP0_STAGE_IDLE;
880 finish:
881 musb_writew(regs, MUSB_CSR0,
882 musb->ackpend);
883 musb->ackpend = 0;
884 }
885 }
886 break;
887
888 case MUSB_EP0_STAGE_ACKWAIT:
889 /* This should not happen. But happens with tusb6010 with
890 * g_file_storage and high speed. Do nothing.
891 */
892 retval = IRQ_HANDLED;
893 break;
894
895 default:
896 /* "can't happen" */
897 WARN_ON(1);
898 musb_writew(regs, MUSB_CSR0, MUSB_CSR0_P_SENDSTALL);
899 musb->ep0_state = MUSB_EP0_STAGE_IDLE;
900 break;
901 }
902
903 return retval;
904 }
905
906
907 static int
908 musb_g_ep0_enable(struct usb_ep *ep, const struct usb_endpoint_descriptor *desc)
909 {
910 /* always enabled */
911 return -EINVAL;
912 }
913
914 static int musb_g_ep0_disable(struct usb_ep *e)
915 {
916 /* always enabled */
917 return -EINVAL;
918 }
919
920 static int
921 musb_g_ep0_queue(struct usb_ep *e, struct usb_request *r, gfp_t gfp_flags)
922 {
923 struct musb_ep *ep;
924 struct musb_request *req;
925 struct musb *musb;
926 int status;
927 unsigned long lockflags;
928 void __iomem *regs;
929
930 if (!e || !r)
931 return -EINVAL;
932
933 ep = to_musb_ep(e);
934 musb = ep->musb;
935 regs = musb->control_ep->regs;
936
937 req = to_musb_request(r);
938 req->musb = musb;
939 req->request.actual = 0;
940 req->request.status = -EINPROGRESS;
941 req->tx = ep->is_in;
942
943 spin_lock_irqsave(&musb->lock, lockflags);
944
945 if (!list_empty(&ep->req_list)) {
946 status = -EBUSY;
947 goto cleanup;
948 }
949
950 switch (musb->ep0_state) {
951 case MUSB_EP0_STAGE_RX: /* control-OUT data */
952 case MUSB_EP0_STAGE_TX: /* control-IN data */
953 case MUSB_EP0_STAGE_ACKWAIT: /* zero-length data */
954 status = 0;
955 break;
956 default:
957 dev_dbg(musb->controller, "ep0 request queued in state %d\n",
958 musb->ep0_state);
959 status = -EINVAL;
960 goto cleanup;
961 }
962
963 /* add request to the list */
964 list_add_tail(&req->list, &ep->req_list);
965
966 dev_dbg(musb->controller, "queue to %s (%s), length=%d\n",
967 ep->name, ep->is_in ? "IN/TX" : "OUT/RX",
968 req->request.length);
969
970 musb_ep_select(musb->mregs, 0);
971
972 /* sequence #1, IN ... start writing the data */
973 if (musb->ep0_state == MUSB_EP0_STAGE_TX)
974 ep0_txstate(musb);
975
976 /* sequence #3, no-data ... issue IN status */
977 else if (musb->ep0_state == MUSB_EP0_STAGE_ACKWAIT) {
978 if (req->request.length)
979 status = -EINVAL;
980 else {
981 musb->ep0_state = MUSB_EP0_STAGE_STATUSIN;
982 musb_writew(regs, MUSB_CSR0,
983 musb->ackpend | MUSB_CSR0_P_DATAEND);
984 musb->ackpend = 0;
985 musb_g_ep0_giveback(ep->musb, r);
986 }
987
988 /* else for sequence #2 (OUT), caller provides a buffer
989 * before the next packet arrives. deferred responses
990 * (after SETUP is acked) are racey.
991 */
992 } else if (musb->ackpend) {
993 musb_writew(regs, MUSB_CSR0, musb->ackpend);
994 musb->ackpend = 0;
995 }
996
997 cleanup:
998 spin_unlock_irqrestore(&musb->lock, lockflags);
999 return status;
1000 }
1001
1002 static int musb_g_ep0_dequeue(struct usb_ep *ep, struct usb_request *req)
1003 {
1004 /* we just won't support this */
1005 return -EINVAL;
1006 }
1007
1008 static int musb_g_ep0_halt(struct usb_ep *e, int value)
1009 {
1010 struct musb_ep *ep;
1011 struct musb *musb;
1012 void __iomem *base, *regs;
1013 unsigned long flags;
1014 int status;
1015 u16 csr;
1016
1017 if (!e || !value)
1018 return -EINVAL;
1019
1020 ep = to_musb_ep(e);
1021 musb = ep->musb;
1022 base = musb->mregs;
1023 regs = musb->control_ep->regs;
1024 status = 0;
1025
1026 spin_lock_irqsave(&musb->lock, flags);
1027
1028 if (!list_empty(&ep->req_list)) {
1029 status = -EBUSY;
1030 goto cleanup;
1031 }
1032
1033 musb_ep_select(base, 0);
1034 csr = musb->ackpend;
1035
1036 switch (musb->ep0_state) {
1037
1038 /* Stalls are usually issued after parsing SETUP packet, either
1039 * directly in irq context from setup() or else later.
1040 */
1041 case MUSB_EP0_STAGE_TX: /* control-IN data */
1042 case MUSB_EP0_STAGE_ACKWAIT: /* STALL for zero-length data */
1043 case MUSB_EP0_STAGE_RX: /* control-OUT data */
1044 csr = musb_readw(regs, MUSB_CSR0);
1045 /* FALLTHROUGH */
1046
1047 /* It's also OK to issue stalls during callbacks when a non-empty
1048 * DATA stage buffer has been read (or even written).
1049 */
1050 case MUSB_EP0_STAGE_STATUSIN: /* control-OUT status */
1051 case MUSB_EP0_STAGE_STATUSOUT: /* control-IN status */
1052
1053 csr |= MUSB_CSR0_P_SENDSTALL;
1054 musb_writew(regs, MUSB_CSR0, csr);
1055 musb->ep0_state = MUSB_EP0_STAGE_IDLE;
1056 musb->ackpend = 0;
1057 break;
1058 default:
1059 dev_dbg(musb->controller, "ep0 can't halt in state %d\n", musb->ep0_state);
1060 status = -EINVAL;
1061 }
1062
1063 cleanup:
1064 spin_unlock_irqrestore(&musb->lock, flags);
1065 return status;
1066 }
1067
1068 const struct usb_ep_ops musb_g_ep0_ops = {
1069 .enable = musb_g_ep0_enable,
1070 .disable = musb_g_ep0_disable,
1071 .alloc_request = musb_alloc_request,
1072 .free_request = musb_free_request,
1073 .queue = musb_g_ep0_queue,
1074 .dequeue = musb_g_ep0_dequeue,
1075 .set_halt = musb_g_ep0_halt,
1076 };
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