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Merge branch 'for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
[mirror_ubuntu-bionic-kernel.git] / drivers / usb / gadget / pxa25x_udc.c
1 /*
2 * Intel PXA25x and IXP4xx on-chip full speed USB device controllers
3 *
4 * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker)
5 * Copyright (C) 2003 Robert Schwebel, Pengutronix
6 * Copyright (C) 2003 Benedikt Spranger, Pengutronix
7 * Copyright (C) 2003 David Brownell
8 * Copyright (C) 2003 Joshua Wise
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16 /* #define VERBOSE_DEBUG */
17
18 #include <linux/device.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/ioport.h>
22 #include <linux/types.h>
23 #include <linux/errno.h>
24 #include <linux/delay.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/timer.h>
28 #include <linux/list.h>
29 #include <linux/interrupt.h>
30 #include <linux/mm.h>
31 #include <linux/platform_device.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/irq.h>
34 #include <linux/clk.h>
35 #include <linux/err.h>
36 #include <linux/seq_file.h>
37 #include <linux/debugfs.h>
38 #include <linux/io.h>
39 #include <linux/prefetch.h>
40
41 #include <asm/byteorder.h>
42 #include <asm/dma.h>
43 #include <asm/gpio.h>
44 #include <asm/system.h>
45 #include <asm/mach-types.h>
46 #include <asm/unaligned.h>
47
48 #include <linux/usb/ch9.h>
49 #include <linux/usb/gadget.h>
50 #include <linux/usb/otg.h>
51
52 /*
53 * This driver is PXA25x only. Grab the right register definitions.
54 */
55 #ifdef CONFIG_ARCH_PXA
56 #include <mach/pxa25x-udc.h>
57 #endif
58
59 #ifdef CONFIG_ARCH_LUBBOCK
60 #include <mach/lubbock.h>
61 #endif
62
63 #include <asm/mach/udc_pxa2xx.h>
64
65
66 /*
67 * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
68 * series processors. The UDC for the IXP 4xx series is very similar.
69 * There are fifteen endpoints, in addition to ep0.
70 *
71 * Such controller drivers work with a gadget driver. The gadget driver
72 * returns descriptors, implements configuration and data protocols used
73 * by the host to interact with this device, and allocates endpoints to
74 * the different protocol interfaces. The controller driver virtualizes
75 * usb hardware so that the gadget drivers will be more portable.
76 *
77 * This UDC hardware wants to implement a bit too much USB protocol, so
78 * it constrains the sorts of USB configuration change events that work.
79 * The errata for these chips are misleading; some "fixed" bugs from
80 * pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
81 *
82 * Note that the UDC hardware supports DMA (except on IXP) but that's
83 * not used here. IN-DMA (to host) is simple enough, when the data is
84 * suitably aligned (16 bytes) ... the network stack doesn't do that,
85 * other software can. OUT-DMA is buggy in most chip versions, as well
86 * as poorly designed (data toggle not automatic). So this driver won't
87 * bother using DMA. (Mostly-working IN-DMA support was available in
88 * kernels before 2.6.23, but was never enabled or well tested.)
89 */
90
91 #define DRIVER_VERSION "30-June-2007"
92 #define DRIVER_DESC "PXA 25x USB Device Controller driver"
93
94
95 static const char driver_name [] = "pxa25x_udc";
96
97 static const char ep0name [] = "ep0";
98
99
100 #ifdef CONFIG_ARCH_IXP4XX
101
102 /* cpu-specific register addresses are compiled in to this code */
103 #ifdef CONFIG_ARCH_PXA
104 #error "Can't configure both IXP and PXA"
105 #endif
106
107 /* IXP doesn't yet support <linux/clk.h> */
108 #define clk_get(dev,name) NULL
109 #define clk_enable(clk) do { } while (0)
110 #define clk_disable(clk) do { } while (0)
111 #define clk_put(clk) do { } while (0)
112
113 #endif
114
115 #include "pxa25x_udc.h"
116
117
118 #ifdef CONFIG_USB_PXA25X_SMALL
119 #define SIZE_STR " (small)"
120 #else
121 #define SIZE_STR ""
122 #endif
123
124 /* ---------------------------------------------------------------------------
125 * endpoint related parts of the api to the usb controller hardware,
126 * used by gadget driver; and the inner talker-to-hardware core.
127 * ---------------------------------------------------------------------------
128 */
129
130 static void pxa25x_ep_fifo_flush (struct usb_ep *ep);
131 static void nuke (struct pxa25x_ep *, int status);
132
133 /* one GPIO should control a D+ pullup, so host sees this device (or not) */
134 static void pullup_off(void)
135 {
136 struct pxa2xx_udc_mach_info *mach = the_controller->mach;
137 int off_level = mach->gpio_pullup_inverted;
138
139 if (gpio_is_valid(mach->gpio_pullup))
140 gpio_set_value(mach->gpio_pullup, off_level);
141 else if (mach->udc_command)
142 mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
143 }
144
145 static void pullup_on(void)
146 {
147 struct pxa2xx_udc_mach_info *mach = the_controller->mach;
148 int on_level = !mach->gpio_pullup_inverted;
149
150 if (gpio_is_valid(mach->gpio_pullup))
151 gpio_set_value(mach->gpio_pullup, on_level);
152 else if (mach->udc_command)
153 mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
154 }
155
156 static void pio_irq_enable(int bEndpointAddress)
157 {
158 bEndpointAddress &= 0xf;
159 if (bEndpointAddress < 8)
160 UICR0 &= ~(1 << bEndpointAddress);
161 else {
162 bEndpointAddress -= 8;
163 UICR1 &= ~(1 << bEndpointAddress);
164 }
165 }
166
167 static void pio_irq_disable(int bEndpointAddress)
168 {
169 bEndpointAddress &= 0xf;
170 if (bEndpointAddress < 8)
171 UICR0 |= 1 << bEndpointAddress;
172 else {
173 bEndpointAddress -= 8;
174 UICR1 |= 1 << bEndpointAddress;
175 }
176 }
177
178 /* The UDCCR reg contains mask and interrupt status bits,
179 * so using '|=' isn't safe as it may ack an interrupt.
180 */
181 #define UDCCR_MASK_BITS (UDCCR_REM | UDCCR_SRM | UDCCR_UDE)
182
183 static inline void udc_set_mask_UDCCR(int mask)
184 {
185 UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
186 }
187
188 static inline void udc_clear_mask_UDCCR(int mask)
189 {
190 UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
191 }
192
193 static inline void udc_ack_int_UDCCR(int mask)
194 {
195 /* udccr contains the bits we dont want to change */
196 __u32 udccr = UDCCR & UDCCR_MASK_BITS;
197
198 UDCCR = udccr | (mask & ~UDCCR_MASK_BITS);
199 }
200
201 /*
202 * endpoint enable/disable
203 *
204 * we need to verify the descriptors used to enable endpoints. since pxa25x
205 * endpoint configurations are fixed, and are pretty much always enabled,
206 * there's not a lot to manage here.
207 *
208 * because pxa25x can't selectively initialize bulk (or interrupt) endpoints,
209 * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
210 * for a single interface (with only the default altsetting) and for gadget
211 * drivers that don't halt endpoints (not reset by set_interface). that also
212 * means that if you use ISO, you must violate the USB spec rule that all
213 * iso endpoints must be in non-default altsettings.
214 */
215 static int pxa25x_ep_enable (struct usb_ep *_ep,
216 const struct usb_endpoint_descriptor *desc)
217 {
218 struct pxa25x_ep *ep;
219 struct pxa25x_udc *dev;
220
221 ep = container_of (_ep, struct pxa25x_ep, ep);
222 if (!_ep || !desc || ep->desc || _ep->name == ep0name
223 || desc->bDescriptorType != USB_DT_ENDPOINT
224 || ep->bEndpointAddress != desc->bEndpointAddress
225 || ep->fifo_size < usb_endpoint_maxp (desc)) {
226 DMSG("%s, bad ep or descriptor\n", __func__);
227 return -EINVAL;
228 }
229
230 /* xfer types must match, except that interrupt ~= bulk */
231 if (ep->bmAttributes != desc->bmAttributes
232 && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
233 && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
234 DMSG("%s, %s type mismatch\n", __func__, _ep->name);
235 return -EINVAL;
236 }
237
238 /* hardware _could_ do smaller, but driver doesn't */
239 if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
240 && usb_endpoint_maxp (desc)
241 != BULK_FIFO_SIZE)
242 || !desc->wMaxPacketSize) {
243 DMSG("%s, bad %s maxpacket\n", __func__, _ep->name);
244 return -ERANGE;
245 }
246
247 dev = ep->dev;
248 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
249 DMSG("%s, bogus device state\n", __func__);
250 return -ESHUTDOWN;
251 }
252
253 ep->desc = desc;
254 ep->stopped = 0;
255 ep->pio_irqs = 0;
256 ep->ep.maxpacket = usb_endpoint_maxp (desc);
257
258 /* flush fifo (mostly for OUT buffers) */
259 pxa25x_ep_fifo_flush (_ep);
260
261 /* ... reset halt state too, if we could ... */
262
263 DBG(DBG_VERBOSE, "enabled %s\n", _ep->name);
264 return 0;
265 }
266
267 static int pxa25x_ep_disable (struct usb_ep *_ep)
268 {
269 struct pxa25x_ep *ep;
270 unsigned long flags;
271
272 ep = container_of (_ep, struct pxa25x_ep, ep);
273 if (!_ep || !ep->desc) {
274 DMSG("%s, %s not enabled\n", __func__,
275 _ep ? ep->ep.name : NULL);
276 return -EINVAL;
277 }
278 local_irq_save(flags);
279
280 nuke (ep, -ESHUTDOWN);
281
282 /* flush fifo (mostly for IN buffers) */
283 pxa25x_ep_fifo_flush (_ep);
284
285 ep->desc = NULL;
286 ep->ep.desc = NULL;
287 ep->stopped = 1;
288
289 local_irq_restore(flags);
290 DBG(DBG_VERBOSE, "%s disabled\n", _ep->name);
291 return 0;
292 }
293
294 /*-------------------------------------------------------------------------*/
295
296 /* for the pxa25x, these can just wrap kmalloc/kfree. gadget drivers
297 * must still pass correctly initialized endpoints, since other controller
298 * drivers may care about how it's currently set up (dma issues etc).
299 */
300
301 /*
302 * pxa25x_ep_alloc_request - allocate a request data structure
303 */
304 static struct usb_request *
305 pxa25x_ep_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
306 {
307 struct pxa25x_request *req;
308
309 req = kzalloc(sizeof(*req), gfp_flags);
310 if (!req)
311 return NULL;
312
313 INIT_LIST_HEAD (&req->queue);
314 return &req->req;
315 }
316
317
318 /*
319 * pxa25x_ep_free_request - deallocate a request data structure
320 */
321 static void
322 pxa25x_ep_free_request (struct usb_ep *_ep, struct usb_request *_req)
323 {
324 struct pxa25x_request *req;
325
326 req = container_of (_req, struct pxa25x_request, req);
327 WARN_ON(!list_empty (&req->queue));
328 kfree(req);
329 }
330
331 /*-------------------------------------------------------------------------*/
332
333 /*
334 * done - retire a request; caller blocked irqs
335 */
336 static void done(struct pxa25x_ep *ep, struct pxa25x_request *req, int status)
337 {
338 unsigned stopped = ep->stopped;
339
340 list_del_init(&req->queue);
341
342 if (likely (req->req.status == -EINPROGRESS))
343 req->req.status = status;
344 else
345 status = req->req.status;
346
347 if (status && status != -ESHUTDOWN)
348 DBG(DBG_VERBOSE, "complete %s req %p stat %d len %u/%u\n",
349 ep->ep.name, &req->req, status,
350 req->req.actual, req->req.length);
351
352 /* don't modify queue heads during completion callback */
353 ep->stopped = 1;
354 req->req.complete(&ep->ep, &req->req);
355 ep->stopped = stopped;
356 }
357
358
359 static inline void ep0_idle (struct pxa25x_udc *dev)
360 {
361 dev->ep0state = EP0_IDLE;
362 }
363
364 static int
365 write_packet(volatile u32 *uddr, struct pxa25x_request *req, unsigned max)
366 {
367 u8 *buf;
368 unsigned length, count;
369
370 buf = req->req.buf + req->req.actual;
371 prefetch(buf);
372
373 /* how big will this packet be? */
374 length = min(req->req.length - req->req.actual, max);
375 req->req.actual += length;
376
377 count = length;
378 while (likely(count--))
379 *uddr = *buf++;
380
381 return length;
382 }
383
384 /*
385 * write to an IN endpoint fifo, as many packets as possible.
386 * irqs will use this to write the rest later.
387 * caller guarantees at least one packet buffer is ready (or a zlp).
388 */
389 static int
390 write_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
391 {
392 unsigned max;
393
394 max = usb_endpoint_maxp(ep->desc);
395 do {
396 unsigned count;
397 int is_last, is_short;
398
399 count = write_packet(ep->reg_uddr, req, max);
400
401 /* last packet is usually short (or a zlp) */
402 if (unlikely (count != max))
403 is_last = is_short = 1;
404 else {
405 if (likely(req->req.length != req->req.actual)
406 || req->req.zero)
407 is_last = 0;
408 else
409 is_last = 1;
410 /* interrupt/iso maxpacket may not fill the fifo */
411 is_short = unlikely (max < ep->fifo_size);
412 }
413
414 DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n",
415 ep->ep.name, count,
416 is_last ? "/L" : "", is_short ? "/S" : "",
417 req->req.length - req->req.actual, req);
418
419 /* let loose that packet. maybe try writing another one,
420 * double buffering might work. TSP, TPC, and TFS
421 * bit values are the same for all normal IN endpoints.
422 */
423 *ep->reg_udccs = UDCCS_BI_TPC;
424 if (is_short)
425 *ep->reg_udccs = UDCCS_BI_TSP;
426
427 /* requests complete when all IN data is in the FIFO */
428 if (is_last) {
429 done (ep, req, 0);
430 if (list_empty(&ep->queue))
431 pio_irq_disable (ep->bEndpointAddress);
432 return 1;
433 }
434
435 // TODO experiment: how robust can fifo mode tweaking be?
436 // double buffering is off in the default fifo mode, which
437 // prevents TFS from being set here.
438
439 } while (*ep->reg_udccs & UDCCS_BI_TFS);
440 return 0;
441 }
442
443 /* caller asserts req->pending (ep0 irq status nyet cleared); starts
444 * ep0 data stage. these chips want very simple state transitions.
445 */
446 static inline
447 void ep0start(struct pxa25x_udc *dev, u32 flags, const char *tag)
448 {
449 UDCCS0 = flags|UDCCS0_SA|UDCCS0_OPR;
450 USIR0 = USIR0_IR0;
451 dev->req_pending = 0;
452 DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n",
453 __func__, tag, UDCCS0, flags);
454 }
455
456 static int
457 write_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
458 {
459 unsigned count;
460 int is_short;
461
462 count = write_packet(&UDDR0, req, EP0_FIFO_SIZE);
463 ep->dev->stats.write.bytes += count;
464
465 /* last packet "must be" short (or a zlp) */
466 is_short = (count != EP0_FIFO_SIZE);
467
468 DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count,
469 req->req.length - req->req.actual, req);
470
471 if (unlikely (is_short)) {
472 if (ep->dev->req_pending)
473 ep0start(ep->dev, UDCCS0_IPR, "short IN");
474 else
475 UDCCS0 = UDCCS0_IPR;
476
477 count = req->req.length;
478 done (ep, req, 0);
479 ep0_idle(ep->dev);
480 #ifndef CONFIG_ARCH_IXP4XX
481 #if 1
482 /* This seems to get rid of lost status irqs in some cases:
483 * host responds quickly, or next request involves config
484 * change automagic, or should have been hidden, or ...
485 *
486 * FIXME get rid of all udelays possible...
487 */
488 if (count >= EP0_FIFO_SIZE) {
489 count = 100;
490 do {
491 if ((UDCCS0 & UDCCS0_OPR) != 0) {
492 /* clear OPR, generate ack */
493 UDCCS0 = UDCCS0_OPR;
494 break;
495 }
496 count--;
497 udelay(1);
498 } while (count);
499 }
500 #endif
501 #endif
502 } else if (ep->dev->req_pending)
503 ep0start(ep->dev, 0, "IN");
504 return is_short;
505 }
506
507
508 /*
509 * read_fifo - unload packet(s) from the fifo we use for usb OUT
510 * transfers and put them into the request. caller should have made
511 * sure there's at least one packet ready.
512 *
513 * returns true if the request completed because of short packet or the
514 * request buffer having filled (and maybe overran till end-of-packet).
515 */
516 static int
517 read_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
518 {
519 for (;;) {
520 u32 udccs;
521 u8 *buf;
522 unsigned bufferspace, count, is_short;
523
524 /* make sure there's a packet in the FIFO.
525 * UDCCS_{BO,IO}_RPC are all the same bit value.
526 * UDCCS_{BO,IO}_RNE are all the same bit value.
527 */
528 udccs = *ep->reg_udccs;
529 if (unlikely ((udccs & UDCCS_BO_RPC) == 0))
530 break;
531 buf = req->req.buf + req->req.actual;
532 prefetchw(buf);
533 bufferspace = req->req.length - req->req.actual;
534
535 /* read all bytes from this packet */
536 if (likely (udccs & UDCCS_BO_RNE)) {
537 count = 1 + (0x0ff & *ep->reg_ubcr);
538 req->req.actual += min (count, bufferspace);
539 } else /* zlp */
540 count = 0;
541 is_short = (count < ep->ep.maxpacket);
542 DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
543 ep->ep.name, udccs, count,
544 is_short ? "/S" : "",
545 req, req->req.actual, req->req.length);
546 while (likely (count-- != 0)) {
547 u8 byte = (u8) *ep->reg_uddr;
548
549 if (unlikely (bufferspace == 0)) {
550 /* this happens when the driver's buffer
551 * is smaller than what the host sent.
552 * discard the extra data.
553 */
554 if (req->req.status != -EOVERFLOW)
555 DMSG("%s overflow %d\n",
556 ep->ep.name, count);
557 req->req.status = -EOVERFLOW;
558 } else {
559 *buf++ = byte;
560 bufferspace--;
561 }
562 }
563 *ep->reg_udccs = UDCCS_BO_RPC;
564 /* RPC/RSP/RNE could now reflect the other packet buffer */
565
566 /* iso is one request per packet */
567 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
568 if (udccs & UDCCS_IO_ROF)
569 req->req.status = -EHOSTUNREACH;
570 /* more like "is_done" */
571 is_short = 1;
572 }
573
574 /* completion */
575 if (is_short || req->req.actual == req->req.length) {
576 done (ep, req, 0);
577 if (list_empty(&ep->queue))
578 pio_irq_disable (ep->bEndpointAddress);
579 return 1;
580 }
581
582 /* finished that packet. the next one may be waiting... */
583 }
584 return 0;
585 }
586
587 /*
588 * special ep0 version of the above. no UBCR0 or double buffering; status
589 * handshaking is magic. most device protocols don't need control-OUT.
590 * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
591 * protocols do use them.
592 */
593 static int
594 read_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
595 {
596 u8 *buf, byte;
597 unsigned bufferspace;
598
599 buf = req->req.buf + req->req.actual;
600 bufferspace = req->req.length - req->req.actual;
601
602 while (UDCCS0 & UDCCS0_RNE) {
603 byte = (u8) UDDR0;
604
605 if (unlikely (bufferspace == 0)) {
606 /* this happens when the driver's buffer
607 * is smaller than what the host sent.
608 * discard the extra data.
609 */
610 if (req->req.status != -EOVERFLOW)
611 DMSG("%s overflow\n", ep->ep.name);
612 req->req.status = -EOVERFLOW;
613 } else {
614 *buf++ = byte;
615 req->req.actual++;
616 bufferspace--;
617 }
618 }
619
620 UDCCS0 = UDCCS0_OPR | UDCCS0_IPR;
621
622 /* completion */
623 if (req->req.actual >= req->req.length)
624 return 1;
625
626 /* finished that packet. the next one may be waiting... */
627 return 0;
628 }
629
630 /*-------------------------------------------------------------------------*/
631
632 static int
633 pxa25x_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
634 {
635 struct pxa25x_request *req;
636 struct pxa25x_ep *ep;
637 struct pxa25x_udc *dev;
638 unsigned long flags;
639
640 req = container_of(_req, struct pxa25x_request, req);
641 if (unlikely (!_req || !_req->complete || !_req->buf
642 || !list_empty(&req->queue))) {
643 DMSG("%s, bad params\n", __func__);
644 return -EINVAL;
645 }
646
647 ep = container_of(_ep, struct pxa25x_ep, ep);
648 if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
649 DMSG("%s, bad ep\n", __func__);
650 return -EINVAL;
651 }
652
653 dev = ep->dev;
654 if (unlikely (!dev->driver
655 || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
656 DMSG("%s, bogus device state\n", __func__);
657 return -ESHUTDOWN;
658 }
659
660 /* iso is always one packet per request, that's the only way
661 * we can report per-packet status. that also helps with dma.
662 */
663 if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
664 && req->req.length > usb_endpoint_maxp (ep->desc)))
665 return -EMSGSIZE;
666
667 DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n",
668 _ep->name, _req, _req->length, _req->buf);
669
670 local_irq_save(flags);
671
672 _req->status = -EINPROGRESS;
673 _req->actual = 0;
674
675 /* kickstart this i/o queue? */
676 if (list_empty(&ep->queue) && !ep->stopped) {
677 if (ep->desc == NULL/* ep0 */) {
678 unsigned length = _req->length;
679
680 switch (dev->ep0state) {
681 case EP0_IN_DATA_PHASE:
682 dev->stats.write.ops++;
683 if (write_ep0_fifo(ep, req))
684 req = NULL;
685 break;
686
687 case EP0_OUT_DATA_PHASE:
688 dev->stats.read.ops++;
689 /* messy ... */
690 if (dev->req_config) {
691 DBG(DBG_VERBOSE, "ep0 config ack%s\n",
692 dev->has_cfr ? "" : " raced");
693 if (dev->has_cfr)
694 UDCCFR = UDCCFR_AREN|UDCCFR_ACM
695 |UDCCFR_MB1;
696 done(ep, req, 0);
697 dev->ep0state = EP0_END_XFER;
698 local_irq_restore (flags);
699 return 0;
700 }
701 if (dev->req_pending)
702 ep0start(dev, UDCCS0_IPR, "OUT");
703 if (length == 0 || ((UDCCS0 & UDCCS0_RNE) != 0
704 && read_ep0_fifo(ep, req))) {
705 ep0_idle(dev);
706 done(ep, req, 0);
707 req = NULL;
708 }
709 break;
710
711 default:
712 DMSG("ep0 i/o, odd state %d\n", dev->ep0state);
713 local_irq_restore (flags);
714 return -EL2HLT;
715 }
716 /* can the FIFO can satisfy the request immediately? */
717 } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
718 if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0
719 && write_fifo(ep, req))
720 req = NULL;
721 } else if ((*ep->reg_udccs & UDCCS_BO_RFS) != 0
722 && read_fifo(ep, req)) {
723 req = NULL;
724 }
725
726 if (likely (req && ep->desc))
727 pio_irq_enable(ep->bEndpointAddress);
728 }
729
730 /* pio or dma irq handler advances the queue. */
731 if (likely(req != NULL))
732 list_add_tail(&req->queue, &ep->queue);
733 local_irq_restore(flags);
734
735 return 0;
736 }
737
738
739 /*
740 * nuke - dequeue ALL requests
741 */
742 static void nuke(struct pxa25x_ep *ep, int status)
743 {
744 struct pxa25x_request *req;
745
746 /* called with irqs blocked */
747 while (!list_empty(&ep->queue)) {
748 req = list_entry(ep->queue.next,
749 struct pxa25x_request,
750 queue);
751 done(ep, req, status);
752 }
753 if (ep->desc)
754 pio_irq_disable (ep->bEndpointAddress);
755 }
756
757
758 /* dequeue JUST ONE request */
759 static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
760 {
761 struct pxa25x_ep *ep;
762 struct pxa25x_request *req;
763 unsigned long flags;
764
765 ep = container_of(_ep, struct pxa25x_ep, ep);
766 if (!_ep || ep->ep.name == ep0name)
767 return -EINVAL;
768
769 local_irq_save(flags);
770
771 /* make sure it's actually queued on this endpoint */
772 list_for_each_entry (req, &ep->queue, queue) {
773 if (&req->req == _req)
774 break;
775 }
776 if (&req->req != _req) {
777 local_irq_restore(flags);
778 return -EINVAL;
779 }
780
781 done(ep, req, -ECONNRESET);
782
783 local_irq_restore(flags);
784 return 0;
785 }
786
787 /*-------------------------------------------------------------------------*/
788
789 static int pxa25x_ep_set_halt(struct usb_ep *_ep, int value)
790 {
791 struct pxa25x_ep *ep;
792 unsigned long flags;
793
794 ep = container_of(_ep, struct pxa25x_ep, ep);
795 if (unlikely (!_ep
796 || (!ep->desc && ep->ep.name != ep0name))
797 || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
798 DMSG("%s, bad ep\n", __func__);
799 return -EINVAL;
800 }
801 if (value == 0) {
802 /* this path (reset toggle+halt) is needed to implement
803 * SET_INTERFACE on normal hardware. but it can't be
804 * done from software on the PXA UDC, and the hardware
805 * forgets to do it as part of SET_INTERFACE automagic.
806 */
807 DMSG("only host can clear %s halt\n", _ep->name);
808 return -EROFS;
809 }
810
811 local_irq_save(flags);
812
813 if ((ep->bEndpointAddress & USB_DIR_IN) != 0
814 && ((*ep->reg_udccs & UDCCS_BI_TFS) == 0
815 || !list_empty(&ep->queue))) {
816 local_irq_restore(flags);
817 return -EAGAIN;
818 }
819
820 /* FST bit is the same for control, bulk in, bulk out, interrupt in */
821 *ep->reg_udccs = UDCCS_BI_FST|UDCCS_BI_FTF;
822
823 /* ep0 needs special care */
824 if (!ep->desc) {
825 start_watchdog(ep->dev);
826 ep->dev->req_pending = 0;
827 ep->dev->ep0state = EP0_STALL;
828
829 /* and bulk/intr endpoints like dropping stalls too */
830 } else {
831 unsigned i;
832 for (i = 0; i < 1000; i += 20) {
833 if (*ep->reg_udccs & UDCCS_BI_SST)
834 break;
835 udelay(20);
836 }
837 }
838 local_irq_restore(flags);
839
840 DBG(DBG_VERBOSE, "%s halt\n", _ep->name);
841 return 0;
842 }
843
844 static int pxa25x_ep_fifo_status(struct usb_ep *_ep)
845 {
846 struct pxa25x_ep *ep;
847
848 ep = container_of(_ep, struct pxa25x_ep, ep);
849 if (!_ep) {
850 DMSG("%s, bad ep\n", __func__);
851 return -ENODEV;
852 }
853 /* pxa can't report unclaimed bytes from IN fifos */
854 if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
855 return -EOPNOTSUPP;
856 if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
857 || (*ep->reg_udccs & UDCCS_BO_RFS) == 0)
858 return 0;
859 else
860 return (*ep->reg_ubcr & 0xfff) + 1;
861 }
862
863 static void pxa25x_ep_fifo_flush(struct usb_ep *_ep)
864 {
865 struct pxa25x_ep *ep;
866
867 ep = container_of(_ep, struct pxa25x_ep, ep);
868 if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
869 DMSG("%s, bad ep\n", __func__);
870 return;
871 }
872
873 /* toggle and halt bits stay unchanged */
874
875 /* for OUT, just read and discard the FIFO contents. */
876 if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
877 while (((*ep->reg_udccs) & UDCCS_BO_RNE) != 0)
878 (void) *ep->reg_uddr;
879 return;
880 }
881
882 /* most IN status is the same, but ISO can't stall */
883 *ep->reg_udccs = UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
884 | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
885 ? 0 : UDCCS_BI_SST);
886 }
887
888
889 static struct usb_ep_ops pxa25x_ep_ops = {
890 .enable = pxa25x_ep_enable,
891 .disable = pxa25x_ep_disable,
892
893 .alloc_request = pxa25x_ep_alloc_request,
894 .free_request = pxa25x_ep_free_request,
895
896 .queue = pxa25x_ep_queue,
897 .dequeue = pxa25x_ep_dequeue,
898
899 .set_halt = pxa25x_ep_set_halt,
900 .fifo_status = pxa25x_ep_fifo_status,
901 .fifo_flush = pxa25x_ep_fifo_flush,
902 };
903
904
905 /* ---------------------------------------------------------------------------
906 * device-scoped parts of the api to the usb controller hardware
907 * ---------------------------------------------------------------------------
908 */
909
910 static int pxa25x_udc_get_frame(struct usb_gadget *_gadget)
911 {
912 return ((UFNRH & 0x07) << 8) | (UFNRL & 0xff);
913 }
914
915 static int pxa25x_udc_wakeup(struct usb_gadget *_gadget)
916 {
917 /* host may not have enabled remote wakeup */
918 if ((UDCCS0 & UDCCS0_DRWF) == 0)
919 return -EHOSTUNREACH;
920 udc_set_mask_UDCCR(UDCCR_RSM);
921 return 0;
922 }
923
924 static void stop_activity(struct pxa25x_udc *, struct usb_gadget_driver *);
925 static void udc_enable (struct pxa25x_udc *);
926 static void udc_disable(struct pxa25x_udc *);
927
928 /* We disable the UDC -- and its 48 MHz clock -- whenever it's not
929 * in active use.
930 */
931 static int pullup(struct pxa25x_udc *udc)
932 {
933 int is_active = udc->vbus && udc->pullup && !udc->suspended;
934 DMSG("%s\n", is_active ? "active" : "inactive");
935 if (is_active) {
936 if (!udc->active) {
937 udc->active = 1;
938 /* Enable clock for USB device */
939 clk_enable(udc->clk);
940 udc_enable(udc);
941 }
942 } else {
943 if (udc->active) {
944 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
945 DMSG("disconnect %s\n", udc->driver
946 ? udc->driver->driver.name
947 : "(no driver)");
948 stop_activity(udc, udc->driver);
949 }
950 udc_disable(udc);
951 /* Disable clock for USB device */
952 clk_disable(udc->clk);
953 udc->active = 0;
954 }
955
956 }
957 return 0;
958 }
959
960 /* VBUS reporting logically comes from a transceiver */
961 static int pxa25x_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
962 {
963 struct pxa25x_udc *udc;
964
965 udc = container_of(_gadget, struct pxa25x_udc, gadget);
966 udc->vbus = is_active;
967 DMSG("vbus %s\n", is_active ? "supplied" : "inactive");
968 pullup(udc);
969 return 0;
970 }
971
972 /* drivers may have software control over D+ pullup */
973 static int pxa25x_udc_pullup(struct usb_gadget *_gadget, int is_active)
974 {
975 struct pxa25x_udc *udc;
976
977 udc = container_of(_gadget, struct pxa25x_udc, gadget);
978
979 /* not all boards support pullup control */
980 if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command)
981 return -EOPNOTSUPP;
982
983 udc->pullup = (is_active != 0);
984 pullup(udc);
985 return 0;
986 }
987
988 /* boards may consume current from VBUS, up to 100-500mA based on config.
989 * the 500uA suspend ceiling means that exclusively vbus-powered PXA designs
990 * violate USB specs.
991 */
992 static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
993 {
994 struct pxa25x_udc *udc;
995
996 udc = container_of(_gadget, struct pxa25x_udc, gadget);
997
998 if (udc->transceiver)
999 return usb_phy_set_power(udc->transceiver, mA);
1000 return -EOPNOTSUPP;
1001 }
1002
1003 static int pxa25x_start(struct usb_gadget_driver *driver,
1004 int (*bind)(struct usb_gadget *));
1005 static int pxa25x_stop(struct usb_gadget_driver *driver);
1006
1007 static const struct usb_gadget_ops pxa25x_udc_ops = {
1008 .get_frame = pxa25x_udc_get_frame,
1009 .wakeup = pxa25x_udc_wakeup,
1010 .vbus_session = pxa25x_udc_vbus_session,
1011 .pullup = pxa25x_udc_pullup,
1012 .vbus_draw = pxa25x_udc_vbus_draw,
1013 .start = pxa25x_start,
1014 .stop = pxa25x_stop,
1015 };
1016
1017 /*-------------------------------------------------------------------------*/
1018
1019 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1020
1021 static int
1022 udc_seq_show(struct seq_file *m, void *_d)
1023 {
1024 struct pxa25x_udc *dev = m->private;
1025 unsigned long flags;
1026 int i;
1027 u32 tmp;
1028
1029 local_irq_save(flags);
1030
1031 /* basic device status */
1032 seq_printf(m, DRIVER_DESC "\n"
1033 "%s version: %s\nGadget driver: %s\nHost %s\n\n",
1034 driver_name, DRIVER_VERSION SIZE_STR "(pio)",
1035 dev->driver ? dev->driver->driver.name : "(none)",
1036 dev->gadget.speed == USB_SPEED_FULL ? "full speed" : "disconnected");
1037
1038 /* registers for device and ep0 */
1039 seq_printf(m,
1040 "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
1041 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
1042
1043 tmp = UDCCR;
1044 seq_printf(m,
1045 "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp,
1046 (tmp & UDCCR_REM) ? " rem" : "",
1047 (tmp & UDCCR_RSTIR) ? " rstir" : "",
1048 (tmp & UDCCR_SRM) ? " srm" : "",
1049 (tmp & UDCCR_SUSIR) ? " susir" : "",
1050 (tmp & UDCCR_RESIR) ? " resir" : "",
1051 (tmp & UDCCR_RSM) ? " rsm" : "",
1052 (tmp & UDCCR_UDA) ? " uda" : "",
1053 (tmp & UDCCR_UDE) ? " ude" : "");
1054
1055 tmp = UDCCS0;
1056 seq_printf(m,
1057 "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp,
1058 (tmp & UDCCS0_SA) ? " sa" : "",
1059 (tmp & UDCCS0_RNE) ? " rne" : "",
1060 (tmp & UDCCS0_FST) ? " fst" : "",
1061 (tmp & UDCCS0_SST) ? " sst" : "",
1062 (tmp & UDCCS0_DRWF) ? " dwrf" : "",
1063 (tmp & UDCCS0_FTF) ? " ftf" : "",
1064 (tmp & UDCCS0_IPR) ? " ipr" : "",
1065 (tmp & UDCCS0_OPR) ? " opr" : "");
1066
1067 if (dev->has_cfr) {
1068 tmp = UDCCFR;
1069 seq_printf(m,
1070 "udccfr %02X =%s%s\n", tmp,
1071 (tmp & UDCCFR_AREN) ? " aren" : "",
1072 (tmp & UDCCFR_ACM) ? " acm" : "");
1073 }
1074
1075 if (dev->gadget.speed != USB_SPEED_FULL || !dev->driver)
1076 goto done;
1077
1078 seq_printf(m, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
1079 dev->stats.write.bytes, dev->stats.write.ops,
1080 dev->stats.read.bytes, dev->stats.read.ops,
1081 dev->stats.irqs);
1082
1083 /* dump endpoint queues */
1084 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1085 struct pxa25x_ep *ep = &dev->ep [i];
1086 struct pxa25x_request *req;
1087
1088 if (i != 0) {
1089 const struct usb_endpoint_descriptor *desc;
1090
1091 desc = ep->desc;
1092 if (!desc)
1093 continue;
1094 tmp = *dev->ep [i].reg_udccs;
1095 seq_printf(m,
1096 "%s max %d %s udccs %02x irqs %lu\n",
1097 ep->ep.name, usb_endpoint_maxp(desc),
1098 "pio", tmp, ep->pio_irqs);
1099 /* TODO translate all five groups of udccs bits! */
1100
1101 } else /* ep0 should only have one transfer queued */
1102 seq_printf(m, "ep0 max 16 pio irqs %lu\n",
1103 ep->pio_irqs);
1104
1105 if (list_empty(&ep->queue)) {
1106 seq_printf(m, "\t(nothing queued)\n");
1107 continue;
1108 }
1109 list_for_each_entry(req, &ep->queue, queue) {
1110 seq_printf(m,
1111 "\treq %p len %d/%d buf %p\n",
1112 &req->req, req->req.actual,
1113 req->req.length, req->req.buf);
1114 }
1115 }
1116
1117 done:
1118 local_irq_restore(flags);
1119 return 0;
1120 }
1121
1122 static int
1123 udc_debugfs_open(struct inode *inode, struct file *file)
1124 {
1125 return single_open(file, udc_seq_show, inode->i_private);
1126 }
1127
1128 static const struct file_operations debug_fops = {
1129 .open = udc_debugfs_open,
1130 .read = seq_read,
1131 .llseek = seq_lseek,
1132 .release = single_release,
1133 .owner = THIS_MODULE,
1134 };
1135
1136 #define create_debug_files(dev) \
1137 do { \
1138 dev->debugfs_udc = debugfs_create_file(dev->gadget.name, \
1139 S_IRUGO, NULL, dev, &debug_fops); \
1140 } while (0)
1141 #define remove_debug_files(dev) \
1142 do { \
1143 if (dev->debugfs_udc) \
1144 debugfs_remove(dev->debugfs_udc); \
1145 } while (0)
1146
1147 #else /* !CONFIG_USB_GADGET_DEBUG_FILES */
1148
1149 #define create_debug_files(dev) do {} while (0)
1150 #define remove_debug_files(dev) do {} while (0)
1151
1152 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1153
1154 /*-------------------------------------------------------------------------*/
1155
1156 /*
1157 * udc_disable - disable USB device controller
1158 */
1159 static void udc_disable(struct pxa25x_udc *dev)
1160 {
1161 /* block all irqs */
1162 udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
1163 UICR0 = UICR1 = 0xff;
1164 UFNRH = UFNRH_SIM;
1165
1166 /* if hardware supports it, disconnect from usb */
1167 pullup_off();
1168
1169 udc_clear_mask_UDCCR(UDCCR_UDE);
1170
1171 ep0_idle (dev);
1172 dev->gadget.speed = USB_SPEED_UNKNOWN;
1173 }
1174
1175
1176 /*
1177 * udc_reinit - initialize software state
1178 */
1179 static void udc_reinit(struct pxa25x_udc *dev)
1180 {
1181 u32 i;
1182
1183 /* device/ep0 records init */
1184 INIT_LIST_HEAD (&dev->gadget.ep_list);
1185 INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1186 dev->ep0state = EP0_IDLE;
1187
1188 /* basic endpoint records init */
1189 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1190 struct pxa25x_ep *ep = &dev->ep[i];
1191
1192 if (i != 0)
1193 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1194
1195 ep->desc = NULL;
1196 ep->ep.desc = NULL;
1197 ep->stopped = 0;
1198 INIT_LIST_HEAD (&ep->queue);
1199 ep->pio_irqs = 0;
1200 }
1201
1202 /* the rest was statically initialized, and is read-only */
1203 }
1204
1205 /* until it's enabled, this UDC should be completely invisible
1206 * to any USB host.
1207 */
1208 static void udc_enable (struct pxa25x_udc *dev)
1209 {
1210 udc_clear_mask_UDCCR(UDCCR_UDE);
1211
1212 /* try to clear these bits before we enable the udc */
1213 udc_ack_int_UDCCR(UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR);
1214
1215 ep0_idle(dev);
1216 dev->gadget.speed = USB_SPEED_UNKNOWN;
1217 dev->stats.irqs = 0;
1218
1219 /*
1220 * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
1221 * - enable UDC
1222 * - if RESET is already in progress, ack interrupt
1223 * - unmask reset interrupt
1224 */
1225 udc_set_mask_UDCCR(UDCCR_UDE);
1226 if (!(UDCCR & UDCCR_UDA))
1227 udc_ack_int_UDCCR(UDCCR_RSTIR);
1228
1229 if (dev->has_cfr /* UDC_RES2 is defined */) {
1230 /* pxa255 (a0+) can avoid a set_config race that could
1231 * prevent gadget drivers from configuring correctly
1232 */
1233 UDCCFR = UDCCFR_ACM | UDCCFR_MB1;
1234 } else {
1235 /* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1)
1236 * which could result in missing packets and interrupts.
1237 * supposedly one bit per endpoint, controlling whether it
1238 * double buffers or not; ACM/AREN bits fit into the holes.
1239 * zero bits (like USIR0_IRx) disable double buffering.
1240 */
1241 UDC_RES1 = 0x00;
1242 UDC_RES2 = 0x00;
1243 }
1244
1245 /* enable suspend/resume and reset irqs */
1246 udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);
1247
1248 /* enable ep0 irqs */
1249 UICR0 &= ~UICR0_IM0;
1250
1251 /* if hardware supports it, pullup D+ and wait for reset */
1252 pullup_on();
1253 }
1254
1255
1256 /* when a driver is successfully registered, it will receive
1257 * control requests including set_configuration(), which enables
1258 * non-control requests. then usb traffic follows until a
1259 * disconnect is reported. then a host may connect again, or
1260 * the driver might get unbound.
1261 */
1262 static int pxa25x_start(struct usb_gadget_driver *driver,
1263 int (*bind)(struct usb_gadget *))
1264 {
1265 struct pxa25x_udc *dev = the_controller;
1266 int retval;
1267
1268 if (!driver
1269 || driver->max_speed < USB_SPEED_FULL
1270 || !bind
1271 || !driver->disconnect
1272 || !driver->setup)
1273 return -EINVAL;
1274 if (!dev)
1275 return -ENODEV;
1276 if (dev->driver)
1277 return -EBUSY;
1278
1279 /* first hook up the driver ... */
1280 dev->driver = driver;
1281 dev->gadget.dev.driver = &driver->driver;
1282 dev->pullup = 1;
1283
1284 retval = device_add (&dev->gadget.dev);
1285 if (retval) {
1286 fail:
1287 dev->driver = NULL;
1288 dev->gadget.dev.driver = NULL;
1289 return retval;
1290 }
1291 retval = bind(&dev->gadget);
1292 if (retval) {
1293 DMSG("bind to driver %s --> error %d\n",
1294 driver->driver.name, retval);
1295 device_del (&dev->gadget.dev);
1296 goto fail;
1297 }
1298
1299 /* ... then enable host detection and ep0; and we're ready
1300 * for set_configuration as well as eventual disconnect.
1301 */
1302 DMSG("registered gadget driver '%s'\n", driver->driver.name);
1303
1304 /* connect to bus through transceiver */
1305 if (dev->transceiver) {
1306 retval = otg_set_peripheral(dev->transceiver->otg,
1307 &dev->gadget);
1308 if (retval) {
1309 DMSG("can't bind to transceiver\n");
1310 if (driver->unbind)
1311 driver->unbind(&dev->gadget);
1312 goto bind_fail;
1313 }
1314 }
1315
1316 pullup(dev);
1317 dump_state(dev);
1318 return 0;
1319 bind_fail:
1320 return retval;
1321 }
1322
1323 static void
1324 stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver)
1325 {
1326 int i;
1327
1328 /* don't disconnect drivers more than once */
1329 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1330 driver = NULL;
1331 dev->gadget.speed = USB_SPEED_UNKNOWN;
1332
1333 /* prevent new request submissions, kill any outstanding requests */
1334 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1335 struct pxa25x_ep *ep = &dev->ep[i];
1336
1337 ep->stopped = 1;
1338 nuke(ep, -ESHUTDOWN);
1339 }
1340 del_timer_sync(&dev->timer);
1341
1342 /* report disconnect; the driver is already quiesced */
1343 if (driver)
1344 driver->disconnect(&dev->gadget);
1345
1346 /* re-init driver-visible data structures */
1347 udc_reinit(dev);
1348 }
1349
1350 static int pxa25x_stop(struct usb_gadget_driver *driver)
1351 {
1352 struct pxa25x_udc *dev = the_controller;
1353
1354 if (!dev)
1355 return -ENODEV;
1356 if (!driver || driver != dev->driver || !driver->unbind)
1357 return -EINVAL;
1358
1359 local_irq_disable();
1360 dev->pullup = 0;
1361 pullup(dev);
1362 stop_activity(dev, driver);
1363 local_irq_enable();
1364
1365 if (dev->transceiver)
1366 (void) otg_set_peripheral(dev->transceiver->otg, NULL);
1367
1368 driver->unbind(&dev->gadget);
1369 dev->gadget.dev.driver = NULL;
1370 dev->driver = NULL;
1371
1372 device_del (&dev->gadget.dev);
1373
1374 DMSG("unregistered gadget driver '%s'\n", driver->driver.name);
1375 dump_state(dev);
1376 return 0;
1377 }
1378
1379 /*-------------------------------------------------------------------------*/
1380
1381 #ifdef CONFIG_ARCH_LUBBOCK
1382
1383 /* Lubbock has separate connect and disconnect irqs. More typical designs
1384 * use one GPIO as the VBUS IRQ, and another to control the D+ pullup.
1385 */
1386
1387 static irqreturn_t
1388 lubbock_vbus_irq(int irq, void *_dev)
1389 {
1390 struct pxa25x_udc *dev = _dev;
1391 int vbus;
1392
1393 dev->stats.irqs++;
1394 switch (irq) {
1395 case LUBBOCK_USB_IRQ:
1396 vbus = 1;
1397 disable_irq(LUBBOCK_USB_IRQ);
1398 enable_irq(LUBBOCK_USB_DISC_IRQ);
1399 break;
1400 case LUBBOCK_USB_DISC_IRQ:
1401 vbus = 0;
1402 disable_irq(LUBBOCK_USB_DISC_IRQ);
1403 enable_irq(LUBBOCK_USB_IRQ);
1404 break;
1405 default:
1406 return IRQ_NONE;
1407 }
1408
1409 pxa25x_udc_vbus_session(&dev->gadget, vbus);
1410 return IRQ_HANDLED;
1411 }
1412
1413 #endif
1414
1415
1416 /*-------------------------------------------------------------------------*/
1417
1418 static inline void clear_ep_state (struct pxa25x_udc *dev)
1419 {
1420 unsigned i;
1421
1422 /* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
1423 * fifos, and pending transactions mustn't be continued in any case.
1424 */
1425 for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
1426 nuke(&dev->ep[i], -ECONNABORTED);
1427 }
1428
1429 static void udc_watchdog(unsigned long _dev)
1430 {
1431 struct pxa25x_udc *dev = (void *)_dev;
1432
1433 local_irq_disable();
1434 if (dev->ep0state == EP0_STALL
1435 && (UDCCS0 & UDCCS0_FST) == 0
1436 && (UDCCS0 & UDCCS0_SST) == 0) {
1437 UDCCS0 = UDCCS0_FST|UDCCS0_FTF;
1438 DBG(DBG_VERBOSE, "ep0 re-stall\n");
1439 start_watchdog(dev);
1440 }
1441 local_irq_enable();
1442 }
1443
1444 static void handle_ep0 (struct pxa25x_udc *dev)
1445 {
1446 u32 udccs0 = UDCCS0;
1447 struct pxa25x_ep *ep = &dev->ep [0];
1448 struct pxa25x_request *req;
1449 union {
1450 struct usb_ctrlrequest r;
1451 u8 raw [8];
1452 u32 word [2];
1453 } u;
1454
1455 if (list_empty(&ep->queue))
1456 req = NULL;
1457 else
1458 req = list_entry(ep->queue.next, struct pxa25x_request, queue);
1459
1460 /* clear stall status */
1461 if (udccs0 & UDCCS0_SST) {
1462 nuke(ep, -EPIPE);
1463 UDCCS0 = UDCCS0_SST;
1464 del_timer(&dev->timer);
1465 ep0_idle(dev);
1466 }
1467
1468 /* previous request unfinished? non-error iff back-to-back ... */
1469 if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
1470 nuke(ep, 0);
1471 del_timer(&dev->timer);
1472 ep0_idle(dev);
1473 }
1474
1475 switch (dev->ep0state) {
1476 case EP0_IDLE:
1477 /* late-breaking status? */
1478 udccs0 = UDCCS0;
1479
1480 /* start control request? */
1481 if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
1482 == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
1483 int i;
1484
1485 nuke (ep, -EPROTO);
1486
1487 /* read SETUP packet */
1488 for (i = 0; i < 8; i++) {
1489 if (unlikely(!(UDCCS0 & UDCCS0_RNE))) {
1490 bad_setup:
1491 DMSG("SETUP %d!\n", i);
1492 goto stall;
1493 }
1494 u.raw [i] = (u8) UDDR0;
1495 }
1496 if (unlikely((UDCCS0 & UDCCS0_RNE) != 0))
1497 goto bad_setup;
1498
1499 got_setup:
1500 DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1501 u.r.bRequestType, u.r.bRequest,
1502 le16_to_cpu(u.r.wValue),
1503 le16_to_cpu(u.r.wIndex),
1504 le16_to_cpu(u.r.wLength));
1505
1506 /* cope with automagic for some standard requests. */
1507 dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
1508 == USB_TYPE_STANDARD;
1509 dev->req_config = 0;
1510 dev->req_pending = 1;
1511 switch (u.r.bRequest) {
1512 /* hardware restricts gadget drivers here! */
1513 case USB_REQ_SET_CONFIGURATION:
1514 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1515 /* reflect hardware's automagic
1516 * up to the gadget driver.
1517 */
1518 config_change:
1519 dev->req_config = 1;
1520 clear_ep_state(dev);
1521 /* if !has_cfr, there's no synch
1522 * else use AREN (later) not SA|OPR
1523 * USIR0_IR0 acts edge sensitive
1524 */
1525 }
1526 break;
1527 /* ... and here, even more ... */
1528 case USB_REQ_SET_INTERFACE:
1529 if (u.r.bRequestType == USB_RECIP_INTERFACE) {
1530 /* udc hardware is broken by design:
1531 * - altsetting may only be zero;
1532 * - hw resets all interfaces' eps;
1533 * - ep reset doesn't include halt(?).
1534 */
1535 DMSG("broken set_interface (%d/%d)\n",
1536 le16_to_cpu(u.r.wIndex),
1537 le16_to_cpu(u.r.wValue));
1538 goto config_change;
1539 }
1540 break;
1541 /* hardware was supposed to hide this */
1542 case USB_REQ_SET_ADDRESS:
1543 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1544 ep0start(dev, 0, "address");
1545 return;
1546 }
1547 break;
1548 }
1549
1550 if (u.r.bRequestType & USB_DIR_IN)
1551 dev->ep0state = EP0_IN_DATA_PHASE;
1552 else
1553 dev->ep0state = EP0_OUT_DATA_PHASE;
1554
1555 i = dev->driver->setup(&dev->gadget, &u.r);
1556 if (i < 0) {
1557 /* hardware automagic preventing STALL... */
1558 if (dev->req_config) {
1559 /* hardware sometimes neglects to tell
1560 * tell us about config change events,
1561 * so later ones may fail...
1562 */
1563 WARNING("config change %02x fail %d?\n",
1564 u.r.bRequest, i);
1565 return;
1566 /* TODO experiment: if has_cfr,
1567 * hardware didn't ACK; maybe we
1568 * could actually STALL!
1569 */
1570 }
1571 DBG(DBG_VERBOSE, "protocol STALL, "
1572 "%02x err %d\n", UDCCS0, i);
1573 stall:
1574 /* the watchdog timer helps deal with cases
1575 * where udc seems to clear FST wrongly, and
1576 * then NAKs instead of STALLing.
1577 */
1578 ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
1579 start_watchdog(dev);
1580 dev->ep0state = EP0_STALL;
1581
1582 /* deferred i/o == no response yet */
1583 } else if (dev->req_pending) {
1584 if (likely(dev->ep0state == EP0_IN_DATA_PHASE
1585 || dev->req_std || u.r.wLength))
1586 ep0start(dev, 0, "defer");
1587 else
1588 ep0start(dev, UDCCS0_IPR, "defer/IPR");
1589 }
1590
1591 /* expect at least one data or status stage irq */
1592 return;
1593
1594 } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
1595 == (UDCCS0_OPR|UDCCS0_SA))) {
1596 unsigned i;
1597
1598 /* pxa210/250 erratum 131 for B0/B1 says RNE lies.
1599 * still observed on a pxa255 a0.
1600 */
1601 DBG(DBG_VERBOSE, "e131\n");
1602 nuke(ep, -EPROTO);
1603
1604 /* read SETUP data, but don't trust it too much */
1605 for (i = 0; i < 8; i++)
1606 u.raw [i] = (u8) UDDR0;
1607 if ((u.r.bRequestType & USB_RECIP_MASK)
1608 > USB_RECIP_OTHER)
1609 goto stall;
1610 if (u.word [0] == 0 && u.word [1] == 0)
1611 goto stall;
1612 goto got_setup;
1613 } else {
1614 /* some random early IRQ:
1615 * - we acked FST
1616 * - IPR cleared
1617 * - OPR got set, without SA (likely status stage)
1618 */
1619 UDCCS0 = udccs0 & (UDCCS0_SA|UDCCS0_OPR);
1620 }
1621 break;
1622 case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR etc */
1623 if (udccs0 & UDCCS0_OPR) {
1624 UDCCS0 = UDCCS0_OPR|UDCCS0_FTF;
1625 DBG(DBG_VERBOSE, "ep0in premature status\n");
1626 if (req)
1627 done(ep, req, 0);
1628 ep0_idle(dev);
1629 } else /* irq was IPR clearing */ {
1630 if (req) {
1631 /* this IN packet might finish the request */
1632 (void) write_ep0_fifo(ep, req);
1633 } /* else IN token before response was written */
1634 }
1635 break;
1636 case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR etc */
1637 if (udccs0 & UDCCS0_OPR) {
1638 if (req) {
1639 /* this OUT packet might finish the request */
1640 if (read_ep0_fifo(ep, req))
1641 done(ep, req, 0);
1642 /* else more OUT packets expected */
1643 } /* else OUT token before read was issued */
1644 } else /* irq was IPR clearing */ {
1645 DBG(DBG_VERBOSE, "ep0out premature status\n");
1646 if (req)
1647 done(ep, req, 0);
1648 ep0_idle(dev);
1649 }
1650 break;
1651 case EP0_END_XFER:
1652 if (req)
1653 done(ep, req, 0);
1654 /* ack control-IN status (maybe in-zlp was skipped)
1655 * also appears after some config change events.
1656 */
1657 if (udccs0 & UDCCS0_OPR)
1658 UDCCS0 = UDCCS0_OPR;
1659 ep0_idle(dev);
1660 break;
1661 case EP0_STALL:
1662 UDCCS0 = UDCCS0_FST;
1663 break;
1664 }
1665 USIR0 = USIR0_IR0;
1666 }
1667
1668 static void handle_ep(struct pxa25x_ep *ep)
1669 {
1670 struct pxa25x_request *req;
1671 int is_in = ep->bEndpointAddress & USB_DIR_IN;
1672 int completed;
1673 u32 udccs, tmp;
1674
1675 do {
1676 completed = 0;
1677 if (likely (!list_empty(&ep->queue)))
1678 req = list_entry(ep->queue.next,
1679 struct pxa25x_request, queue);
1680 else
1681 req = NULL;
1682
1683 // TODO check FST handling
1684
1685 udccs = *ep->reg_udccs;
1686 if (unlikely(is_in)) { /* irq from TPC, SST, or (ISO) TUR */
1687 tmp = UDCCS_BI_TUR;
1688 if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1689 tmp |= UDCCS_BI_SST;
1690 tmp &= udccs;
1691 if (likely (tmp))
1692 *ep->reg_udccs = tmp;
1693 if (req && likely ((udccs & UDCCS_BI_TFS) != 0))
1694 completed = write_fifo(ep, req);
1695
1696 } else { /* irq from RPC (or for ISO, ROF) */
1697 if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1698 tmp = UDCCS_BO_SST | UDCCS_BO_DME;
1699 else
1700 tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
1701 tmp &= udccs;
1702 if (likely(tmp))
1703 *ep->reg_udccs = tmp;
1704
1705 /* fifos can hold packets, ready for reading... */
1706 if (likely(req)) {
1707 completed = read_fifo(ep, req);
1708 } else
1709 pio_irq_disable (ep->bEndpointAddress);
1710 }
1711 ep->pio_irqs++;
1712 } while (completed);
1713 }
1714
1715 /*
1716 * pxa25x_udc_irq - interrupt handler
1717 *
1718 * avoid delays in ep0 processing. the control handshaking isn't always
1719 * under software control (pxa250c0 and the pxa255 are better), and delays
1720 * could cause usb protocol errors.
1721 */
1722 static irqreturn_t
1723 pxa25x_udc_irq(int irq, void *_dev)
1724 {
1725 struct pxa25x_udc *dev = _dev;
1726 int handled;
1727
1728 dev->stats.irqs++;
1729 do {
1730 u32 udccr = UDCCR;
1731
1732 handled = 0;
1733
1734 /* SUSpend Interrupt Request */
1735 if (unlikely(udccr & UDCCR_SUSIR)) {
1736 udc_ack_int_UDCCR(UDCCR_SUSIR);
1737 handled = 1;
1738 DBG(DBG_VERBOSE, "USB suspend\n");
1739
1740 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1741 && dev->driver
1742 && dev->driver->suspend)
1743 dev->driver->suspend(&dev->gadget);
1744 ep0_idle (dev);
1745 }
1746
1747 /* RESume Interrupt Request */
1748 if (unlikely(udccr & UDCCR_RESIR)) {
1749 udc_ack_int_UDCCR(UDCCR_RESIR);
1750 handled = 1;
1751 DBG(DBG_VERBOSE, "USB resume\n");
1752
1753 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1754 && dev->driver
1755 && dev->driver->resume)
1756 dev->driver->resume(&dev->gadget);
1757 }
1758
1759 /* ReSeT Interrupt Request - USB reset */
1760 if (unlikely(udccr & UDCCR_RSTIR)) {
1761 udc_ack_int_UDCCR(UDCCR_RSTIR);
1762 handled = 1;
1763
1764 if ((UDCCR & UDCCR_UDA) == 0) {
1765 DBG(DBG_VERBOSE, "USB reset start\n");
1766
1767 /* reset driver and endpoints,
1768 * in case that's not yet done
1769 */
1770 stop_activity (dev, dev->driver);
1771
1772 } else {
1773 DBG(DBG_VERBOSE, "USB reset end\n");
1774 dev->gadget.speed = USB_SPEED_FULL;
1775 memset(&dev->stats, 0, sizeof dev->stats);
1776 /* driver and endpoints are still reset */
1777 }
1778
1779 } else {
1780 u32 usir0 = USIR0 & ~UICR0;
1781 u32 usir1 = USIR1 & ~UICR1;
1782 int i;
1783
1784 if (unlikely (!usir0 && !usir1))
1785 continue;
1786
1787 DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0);
1788
1789 /* control traffic */
1790 if (usir0 & USIR0_IR0) {
1791 dev->ep[0].pio_irqs++;
1792 handle_ep0(dev);
1793 handled = 1;
1794 }
1795
1796 /* endpoint data transfers */
1797 for (i = 0; i < 8; i++) {
1798 u32 tmp = 1 << i;
1799
1800 if (i && (usir0 & tmp)) {
1801 handle_ep(&dev->ep[i]);
1802 USIR0 |= tmp;
1803 handled = 1;
1804 }
1805 #ifndef CONFIG_USB_PXA25X_SMALL
1806 if (usir1 & tmp) {
1807 handle_ep(&dev->ep[i+8]);
1808 USIR1 |= tmp;
1809 handled = 1;
1810 }
1811 #endif
1812 }
1813 }
1814
1815 /* we could also ask for 1 msec SOF (SIR) interrupts */
1816
1817 } while (handled);
1818 return IRQ_HANDLED;
1819 }
1820
1821 /*-------------------------------------------------------------------------*/
1822
1823 static void nop_release (struct device *dev)
1824 {
1825 DMSG("%s %s\n", __func__, dev_name(dev));
1826 }
1827
1828 /* this uses load-time allocation and initialization (instead of
1829 * doing it at run-time) to save code, eliminate fault paths, and
1830 * be more obviously correct.
1831 */
1832 static struct pxa25x_udc memory = {
1833 .gadget = {
1834 .ops = &pxa25x_udc_ops,
1835 .ep0 = &memory.ep[0].ep,
1836 .name = driver_name,
1837 .dev = {
1838 .init_name = "gadget",
1839 .release = nop_release,
1840 },
1841 },
1842
1843 /* control endpoint */
1844 .ep[0] = {
1845 .ep = {
1846 .name = ep0name,
1847 .ops = &pxa25x_ep_ops,
1848 .maxpacket = EP0_FIFO_SIZE,
1849 },
1850 .dev = &memory,
1851 .reg_udccs = &UDCCS0,
1852 .reg_uddr = &UDDR0,
1853 },
1854
1855 /* first group of endpoints */
1856 .ep[1] = {
1857 .ep = {
1858 .name = "ep1in-bulk",
1859 .ops = &pxa25x_ep_ops,
1860 .maxpacket = BULK_FIFO_SIZE,
1861 },
1862 .dev = &memory,
1863 .fifo_size = BULK_FIFO_SIZE,
1864 .bEndpointAddress = USB_DIR_IN | 1,
1865 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1866 .reg_udccs = &UDCCS1,
1867 .reg_uddr = &UDDR1,
1868 },
1869 .ep[2] = {
1870 .ep = {
1871 .name = "ep2out-bulk",
1872 .ops = &pxa25x_ep_ops,
1873 .maxpacket = BULK_FIFO_SIZE,
1874 },
1875 .dev = &memory,
1876 .fifo_size = BULK_FIFO_SIZE,
1877 .bEndpointAddress = 2,
1878 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1879 .reg_udccs = &UDCCS2,
1880 .reg_ubcr = &UBCR2,
1881 .reg_uddr = &UDDR2,
1882 },
1883 #ifndef CONFIG_USB_PXA25X_SMALL
1884 .ep[3] = {
1885 .ep = {
1886 .name = "ep3in-iso",
1887 .ops = &pxa25x_ep_ops,
1888 .maxpacket = ISO_FIFO_SIZE,
1889 },
1890 .dev = &memory,
1891 .fifo_size = ISO_FIFO_SIZE,
1892 .bEndpointAddress = USB_DIR_IN | 3,
1893 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1894 .reg_udccs = &UDCCS3,
1895 .reg_uddr = &UDDR3,
1896 },
1897 .ep[4] = {
1898 .ep = {
1899 .name = "ep4out-iso",
1900 .ops = &pxa25x_ep_ops,
1901 .maxpacket = ISO_FIFO_SIZE,
1902 },
1903 .dev = &memory,
1904 .fifo_size = ISO_FIFO_SIZE,
1905 .bEndpointAddress = 4,
1906 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1907 .reg_udccs = &UDCCS4,
1908 .reg_ubcr = &UBCR4,
1909 .reg_uddr = &UDDR4,
1910 },
1911 .ep[5] = {
1912 .ep = {
1913 .name = "ep5in-int",
1914 .ops = &pxa25x_ep_ops,
1915 .maxpacket = INT_FIFO_SIZE,
1916 },
1917 .dev = &memory,
1918 .fifo_size = INT_FIFO_SIZE,
1919 .bEndpointAddress = USB_DIR_IN | 5,
1920 .bmAttributes = USB_ENDPOINT_XFER_INT,
1921 .reg_udccs = &UDCCS5,
1922 .reg_uddr = &UDDR5,
1923 },
1924
1925 /* second group of endpoints */
1926 .ep[6] = {
1927 .ep = {
1928 .name = "ep6in-bulk",
1929 .ops = &pxa25x_ep_ops,
1930 .maxpacket = BULK_FIFO_SIZE,
1931 },
1932 .dev = &memory,
1933 .fifo_size = BULK_FIFO_SIZE,
1934 .bEndpointAddress = USB_DIR_IN | 6,
1935 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1936 .reg_udccs = &UDCCS6,
1937 .reg_uddr = &UDDR6,
1938 },
1939 .ep[7] = {
1940 .ep = {
1941 .name = "ep7out-bulk",
1942 .ops = &pxa25x_ep_ops,
1943 .maxpacket = BULK_FIFO_SIZE,
1944 },
1945 .dev = &memory,
1946 .fifo_size = BULK_FIFO_SIZE,
1947 .bEndpointAddress = 7,
1948 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1949 .reg_udccs = &UDCCS7,
1950 .reg_ubcr = &UBCR7,
1951 .reg_uddr = &UDDR7,
1952 },
1953 .ep[8] = {
1954 .ep = {
1955 .name = "ep8in-iso",
1956 .ops = &pxa25x_ep_ops,
1957 .maxpacket = ISO_FIFO_SIZE,
1958 },
1959 .dev = &memory,
1960 .fifo_size = ISO_FIFO_SIZE,
1961 .bEndpointAddress = USB_DIR_IN | 8,
1962 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1963 .reg_udccs = &UDCCS8,
1964 .reg_uddr = &UDDR8,
1965 },
1966 .ep[9] = {
1967 .ep = {
1968 .name = "ep9out-iso",
1969 .ops = &pxa25x_ep_ops,
1970 .maxpacket = ISO_FIFO_SIZE,
1971 },
1972 .dev = &memory,
1973 .fifo_size = ISO_FIFO_SIZE,
1974 .bEndpointAddress = 9,
1975 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1976 .reg_udccs = &UDCCS9,
1977 .reg_ubcr = &UBCR9,
1978 .reg_uddr = &UDDR9,
1979 },
1980 .ep[10] = {
1981 .ep = {
1982 .name = "ep10in-int",
1983 .ops = &pxa25x_ep_ops,
1984 .maxpacket = INT_FIFO_SIZE,
1985 },
1986 .dev = &memory,
1987 .fifo_size = INT_FIFO_SIZE,
1988 .bEndpointAddress = USB_DIR_IN | 10,
1989 .bmAttributes = USB_ENDPOINT_XFER_INT,
1990 .reg_udccs = &UDCCS10,
1991 .reg_uddr = &UDDR10,
1992 },
1993
1994 /* third group of endpoints */
1995 .ep[11] = {
1996 .ep = {
1997 .name = "ep11in-bulk",
1998 .ops = &pxa25x_ep_ops,
1999 .maxpacket = BULK_FIFO_SIZE,
2000 },
2001 .dev = &memory,
2002 .fifo_size = BULK_FIFO_SIZE,
2003 .bEndpointAddress = USB_DIR_IN | 11,
2004 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2005 .reg_udccs = &UDCCS11,
2006 .reg_uddr = &UDDR11,
2007 },
2008 .ep[12] = {
2009 .ep = {
2010 .name = "ep12out-bulk",
2011 .ops = &pxa25x_ep_ops,
2012 .maxpacket = BULK_FIFO_SIZE,
2013 },
2014 .dev = &memory,
2015 .fifo_size = BULK_FIFO_SIZE,
2016 .bEndpointAddress = 12,
2017 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2018 .reg_udccs = &UDCCS12,
2019 .reg_ubcr = &UBCR12,
2020 .reg_uddr = &UDDR12,
2021 },
2022 .ep[13] = {
2023 .ep = {
2024 .name = "ep13in-iso",
2025 .ops = &pxa25x_ep_ops,
2026 .maxpacket = ISO_FIFO_SIZE,
2027 },
2028 .dev = &memory,
2029 .fifo_size = ISO_FIFO_SIZE,
2030 .bEndpointAddress = USB_DIR_IN | 13,
2031 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
2032 .reg_udccs = &UDCCS13,
2033 .reg_uddr = &UDDR13,
2034 },
2035 .ep[14] = {
2036 .ep = {
2037 .name = "ep14out-iso",
2038 .ops = &pxa25x_ep_ops,
2039 .maxpacket = ISO_FIFO_SIZE,
2040 },
2041 .dev = &memory,
2042 .fifo_size = ISO_FIFO_SIZE,
2043 .bEndpointAddress = 14,
2044 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
2045 .reg_udccs = &UDCCS14,
2046 .reg_ubcr = &UBCR14,
2047 .reg_uddr = &UDDR14,
2048 },
2049 .ep[15] = {
2050 .ep = {
2051 .name = "ep15in-int",
2052 .ops = &pxa25x_ep_ops,
2053 .maxpacket = INT_FIFO_SIZE,
2054 },
2055 .dev = &memory,
2056 .fifo_size = INT_FIFO_SIZE,
2057 .bEndpointAddress = USB_DIR_IN | 15,
2058 .bmAttributes = USB_ENDPOINT_XFER_INT,
2059 .reg_udccs = &UDCCS15,
2060 .reg_uddr = &UDDR15,
2061 },
2062 #endif /* !CONFIG_USB_PXA25X_SMALL */
2063 };
2064
2065 #define CP15R0_VENDOR_MASK 0xffffe000
2066
2067 #if defined(CONFIG_ARCH_PXA)
2068 #define CP15R0_XSCALE_VALUE 0x69052000 /* intel/arm/xscale */
2069
2070 #elif defined(CONFIG_ARCH_IXP4XX)
2071 #define CP15R0_XSCALE_VALUE 0x69054000 /* intel/arm/ixp4xx */
2072
2073 #endif
2074
2075 #define CP15R0_PROD_MASK 0x000003f0
2076 #define PXA25x 0x00000100 /* and PXA26x */
2077 #define PXA210 0x00000120
2078
2079 #define CP15R0_REV_MASK 0x0000000f
2080
2081 #define CP15R0_PRODREV_MASK (CP15R0_PROD_MASK | CP15R0_REV_MASK)
2082
2083 #define PXA255_A0 0x00000106 /* or PXA260_B1 */
2084 #define PXA250_C0 0x00000105 /* or PXA26x_B0 */
2085 #define PXA250_B2 0x00000104
2086 #define PXA250_B1 0x00000103 /* or PXA260_A0 */
2087 #define PXA250_B0 0x00000102
2088 #define PXA250_A1 0x00000101
2089 #define PXA250_A0 0x00000100
2090
2091 #define PXA210_C0 0x00000125
2092 #define PXA210_B2 0x00000124
2093 #define PXA210_B1 0x00000123
2094 #define PXA210_B0 0x00000122
2095 #define IXP425_A0 0x000001c1
2096 #define IXP425_B0 0x000001f1
2097 #define IXP465_AD 0x00000200
2098
2099 /*
2100 * probe - binds to the platform device
2101 */
2102 static int __init pxa25x_udc_probe(struct platform_device *pdev)
2103 {
2104 struct pxa25x_udc *dev = &memory;
2105 int retval, irq;
2106 u32 chiprev;
2107
2108 /* insist on Intel/ARM/XScale */
2109 asm("mrc%? p15, 0, %0, c0, c0" : "=r" (chiprev));
2110 if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) {
2111 pr_err("%s: not XScale!\n", driver_name);
2112 return -ENODEV;
2113 }
2114
2115 /* trigger chiprev-specific logic */
2116 switch (chiprev & CP15R0_PRODREV_MASK) {
2117 #if defined(CONFIG_ARCH_PXA)
2118 case PXA255_A0:
2119 dev->has_cfr = 1;
2120 break;
2121 case PXA250_A0:
2122 case PXA250_A1:
2123 /* A0/A1 "not released"; ep 13, 15 unusable */
2124 /* fall through */
2125 case PXA250_B2: case PXA210_B2:
2126 case PXA250_B1: case PXA210_B1:
2127 case PXA250_B0: case PXA210_B0:
2128 /* OUT-DMA is broken ... */
2129 /* fall through */
2130 case PXA250_C0: case PXA210_C0:
2131 break;
2132 #elif defined(CONFIG_ARCH_IXP4XX)
2133 case IXP425_A0:
2134 case IXP425_B0:
2135 case IXP465_AD:
2136 dev->has_cfr = 1;
2137 break;
2138 #endif
2139 default:
2140 pr_err("%s: unrecognized processor: %08x\n",
2141 driver_name, chiprev);
2142 /* iop3xx, ixp4xx, ... */
2143 return -ENODEV;
2144 }
2145
2146 irq = platform_get_irq(pdev, 0);
2147 if (irq < 0)
2148 return -ENODEV;
2149
2150 dev->clk = clk_get(&pdev->dev, NULL);
2151 if (IS_ERR(dev->clk)) {
2152 retval = PTR_ERR(dev->clk);
2153 goto err_clk;
2154 }
2155
2156 pr_debug("%s: IRQ %d%s%s\n", driver_name, irq,
2157 dev->has_cfr ? "" : " (!cfr)",
2158 SIZE_STR "(pio)"
2159 );
2160
2161 /* other non-static parts of init */
2162 dev->dev = &pdev->dev;
2163 dev->mach = pdev->dev.platform_data;
2164
2165 dev->transceiver = usb_get_transceiver();
2166
2167 if (gpio_is_valid(dev->mach->gpio_pullup)) {
2168 if ((retval = gpio_request(dev->mach->gpio_pullup,
2169 "pca25x_udc GPIO PULLUP"))) {
2170 dev_dbg(&pdev->dev,
2171 "can't get pullup gpio %d, err: %d\n",
2172 dev->mach->gpio_pullup, retval);
2173 goto err_gpio_pullup;
2174 }
2175 gpio_direction_output(dev->mach->gpio_pullup, 0);
2176 }
2177
2178 init_timer(&dev->timer);
2179 dev->timer.function = udc_watchdog;
2180 dev->timer.data = (unsigned long) dev;
2181
2182 device_initialize(&dev->gadget.dev);
2183 dev->gadget.dev.parent = &pdev->dev;
2184 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2185
2186 the_controller = dev;
2187 platform_set_drvdata(pdev, dev);
2188
2189 udc_disable(dev);
2190 udc_reinit(dev);
2191
2192 dev->vbus = 0;
2193
2194 /* irq setup after old hardware state is cleaned up */
2195 retval = request_irq(irq, pxa25x_udc_irq,
2196 0, driver_name, dev);
2197 if (retval != 0) {
2198 pr_err("%s: can't get irq %d, err %d\n",
2199 driver_name, irq, retval);
2200 goto err_irq1;
2201 }
2202 dev->got_irq = 1;
2203
2204 #ifdef CONFIG_ARCH_LUBBOCK
2205 if (machine_is_lubbock()) {
2206 retval = request_irq(LUBBOCK_USB_DISC_IRQ,
2207 lubbock_vbus_irq,
2208 IRQF_SAMPLE_RANDOM,
2209 driver_name, dev);
2210 if (retval != 0) {
2211 pr_err("%s: can't get irq %i, err %d\n",
2212 driver_name, LUBBOCK_USB_DISC_IRQ, retval);
2213 goto err_irq_lub;
2214 }
2215 retval = request_irq(LUBBOCK_USB_IRQ,
2216 lubbock_vbus_irq,
2217 IRQF_SAMPLE_RANDOM,
2218 driver_name, dev);
2219 if (retval != 0) {
2220 pr_err("%s: can't get irq %i, err %d\n",
2221 driver_name, LUBBOCK_USB_IRQ, retval);
2222 goto lubbock_fail0;
2223 }
2224 } else
2225 #endif
2226 create_debug_files(dev);
2227
2228 retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget);
2229 if (!retval)
2230 return retval;
2231
2232 remove_debug_files(dev);
2233 #ifdef CONFIG_ARCH_LUBBOCK
2234 lubbock_fail0:
2235 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2236 err_irq_lub:
2237 free_irq(irq, dev);
2238 #endif
2239 err_irq1:
2240 if (gpio_is_valid(dev->mach->gpio_pullup))
2241 gpio_free(dev->mach->gpio_pullup);
2242 err_gpio_pullup:
2243 if (dev->transceiver) {
2244 usb_put_transceiver(dev->transceiver);
2245 dev->transceiver = NULL;
2246 }
2247 clk_put(dev->clk);
2248 err_clk:
2249 return retval;
2250 }
2251
2252 static void pxa25x_udc_shutdown(struct platform_device *_dev)
2253 {
2254 pullup_off();
2255 }
2256
2257 static int __exit pxa25x_udc_remove(struct platform_device *pdev)
2258 {
2259 struct pxa25x_udc *dev = platform_get_drvdata(pdev);
2260
2261 usb_del_gadget_udc(&dev->gadget);
2262 if (dev->driver)
2263 return -EBUSY;
2264
2265 dev->pullup = 0;
2266 pullup(dev);
2267
2268 remove_debug_files(dev);
2269
2270 if (dev->got_irq) {
2271 free_irq(platform_get_irq(pdev, 0), dev);
2272 dev->got_irq = 0;
2273 }
2274 #ifdef CONFIG_ARCH_LUBBOCK
2275 if (machine_is_lubbock()) {
2276 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2277 free_irq(LUBBOCK_USB_IRQ, dev);
2278 }
2279 #endif
2280 if (gpio_is_valid(dev->mach->gpio_pullup))
2281 gpio_free(dev->mach->gpio_pullup);
2282
2283 clk_put(dev->clk);
2284
2285 if (dev->transceiver) {
2286 usb_put_transceiver(dev->transceiver);
2287 dev->transceiver = NULL;
2288 }
2289
2290 platform_set_drvdata(pdev, NULL);
2291 the_controller = NULL;
2292 return 0;
2293 }
2294
2295 /*-------------------------------------------------------------------------*/
2296
2297 #ifdef CONFIG_PM
2298
2299 /* USB suspend (controlled by the host) and system suspend (controlled
2300 * by the PXA) don't necessarily work well together. If USB is active,
2301 * the 48 MHz clock is required; so the system can't enter 33 MHz idle
2302 * mode, or any deeper PM saving state.
2303 *
2304 * For now, we punt and forcibly disconnect from the USB host when PXA
2305 * enters any suspend state. While we're disconnected, we always disable
2306 * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states.
2307 * Boards without software pullup control shouldn't use those states.
2308 * VBUS IRQs should probably be ignored so that the PXA device just acts
2309 * "dead" to USB hosts until system resume.
2310 */
2311 static int pxa25x_udc_suspend(struct platform_device *dev, pm_message_t state)
2312 {
2313 struct pxa25x_udc *udc = platform_get_drvdata(dev);
2314 unsigned long flags;
2315
2316 if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command)
2317 WARNING("USB host won't detect disconnect!\n");
2318 udc->suspended = 1;
2319
2320 local_irq_save(flags);
2321 pullup(udc);
2322 local_irq_restore(flags);
2323
2324 return 0;
2325 }
2326
2327 static int pxa25x_udc_resume(struct platform_device *dev)
2328 {
2329 struct pxa25x_udc *udc = platform_get_drvdata(dev);
2330 unsigned long flags;
2331
2332 udc->suspended = 0;
2333 local_irq_save(flags);
2334 pullup(udc);
2335 local_irq_restore(flags);
2336
2337 return 0;
2338 }
2339
2340 #else
2341 #define pxa25x_udc_suspend NULL
2342 #define pxa25x_udc_resume NULL
2343 #endif
2344
2345 /*-------------------------------------------------------------------------*/
2346
2347 static struct platform_driver udc_driver = {
2348 .shutdown = pxa25x_udc_shutdown,
2349 .remove = __exit_p(pxa25x_udc_remove),
2350 .suspend = pxa25x_udc_suspend,
2351 .resume = pxa25x_udc_resume,
2352 .driver = {
2353 .owner = THIS_MODULE,
2354 .name = "pxa25x-udc",
2355 },
2356 };
2357
2358 static int __init udc_init(void)
2359 {
2360 pr_info("%s: version %s\n", driver_name, DRIVER_VERSION);
2361 return platform_driver_probe(&udc_driver, pxa25x_udc_probe);
2362 }
2363 module_init(udc_init);
2364
2365 static void __exit udc_exit(void)
2366 {
2367 platform_driver_unregister(&udc_driver);
2368 }
2369 module_exit(udc_exit);
2370
2371 MODULE_DESCRIPTION(DRIVER_DESC);
2372 MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
2373 MODULE_LICENSE("GPL");
2374 MODULE_ALIAS("platform:pxa25x-udc");
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