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