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On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / drivers / usb / gadget / pxa25x_udc.c
blobe6fedbd5a6545d539329983ec4c2a0e666cfd118
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 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25
26 /* #define VERBOSE_DEBUG */
27
28 #include <linux/device.h>
29 #include <linux/module.h>
30 #include <linux/kernel.h>
31 #include <linux/ioport.h>
32 #include <linux/types.h>
33 #include <linux/errno.h>
34 #include <linux/delay.h>
35 #include <linux/slab.h>
36 #include <linux/init.h>
37 #include <linux/timer.h>
38 #include <linux/list.h>
39 #include <linux/interrupt.h>
40 #include <linux/mm.h>
41 #include <linux/platform_device.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/irq.h>
44 #include <linux/clk.h>
45 #include <linux/err.h>
46 #include <linux/seq_file.h>
47 #include <linux/debugfs.h>
48 #include <linux/io.h>
49
50 #include <asm/byteorder.h>
51 #include <asm/dma.h>
52 #include <asm/gpio.h>
53 #include <asm/system.h>
54 #include <asm/mach-types.h>
55 #include <asm/unaligned.h>
56
57 #include <linux/usb/ch9.h>
58 #include <linux/usb/gadget.h>
59 #include <linux/usb/otg.h>
60
61 /*
62 * This driver is PXA25x only. Grab the right register definitions.
63 */
64 #ifdef CONFIG_ARCH_PXA
65 #include <mach/pxa25x-udc.h>
66 #endif
67
68 #include <asm/mach/udc_pxa2xx.h>
69
70
71 /*
72 * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
73 * series processors. The UDC for the IXP 4xx series is very similar.
74 * There are fifteen endpoints, in addition to ep0.
75 *
76 * Such controller drivers work with a gadget driver. The gadget driver
77 * returns descriptors, implements configuration and data protocols used
78 * by the host to interact with this device, and allocates endpoints to
79 * the different protocol interfaces. The controller driver virtualizes
80 * usb hardware so that the gadget drivers will be more portable.
81 *
82 * This UDC hardware wants to implement a bit too much USB protocol, so
83 * it constrains the sorts of USB configuration change events that work.
84 * The errata for these chips are misleading; some "fixed" bugs from
85 * pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
86 *
87 * Note that the UDC hardware supports DMA (except on IXP) but that's
88 * not used here. IN-DMA (to host) is simple enough, when the data is
89 * suitably aligned (16 bytes) ... the network stack doesn't do that,
90 * other software can. OUT-DMA is buggy in most chip versions, as well
91 * as poorly designed (data toggle not automatic). So this driver won't
92 * bother using DMA. (Mostly-working IN-DMA support was available in
93 * kernels before 2.6.23, but was never enabled or well tested.)
94 */
95
96 #define DRIVER_VERSION "30-June-2007"
97 #define DRIVER_DESC "PXA 25x USB Device Controller driver"
98
99
100 static const char driver_name [] = "pxa25x_udc";
101
102 static const char ep0name [] = "ep0";
103
104
105 #ifdef CONFIG_ARCH_IXP4XX
106
107 /* cpu-specific register addresses are compiled in to this code */
108 #ifdef CONFIG_ARCH_PXA
109 #error "Can't configure both IXP and PXA"
110 #endif
111
112 /* IXP doesn't yet support <linux/clk.h> */
113 #define clk_get(dev,name) NULL
114 #define clk_enable(clk) do { } while (0)
115 #define clk_disable(clk) do { } while (0)
116 #define clk_put(clk) do { } while (0)
117
118 #endif
119
120 #include "pxa25x_udc.h"
121
122
123 #ifdef CONFIG_USB_PXA25X_SMALL
124 #define SIZE_STR " (small)"
125 #else
126 #define SIZE_STR ""
127 #endif
128
129 /* ---------------------------------------------------------------------------
130 * endpoint related parts of the api to the usb controller hardware,
131 * used by gadget driver; and the inner talker-to-hardware core.
132 * ---------------------------------------------------------------------------
133 */
134
135 static void pxa25x_ep_fifo_flush (struct usb_ep *ep);
136 static void nuke (struct pxa25x_ep *, int status);
137
138 /* one GPIO should be used to detect VBUS from the host */
139 static int is_vbus_present(void)
140 {
141 struct pxa2xx_udc_mach_info *mach = the_controller->mach;
142
143 if (gpio_is_valid(mach->gpio_vbus)) {
144 int value = gpio_get_value(mach->gpio_vbus);
145
146 if (mach->gpio_vbus_inverted)
147 return !value;
148 else
149 return !!value;
150 }
151 if (mach->udc_is_connected)
152 return mach->udc_is_connected();
153 return 1;
154 }
155
156 /* one GPIO should control a D+ pullup, so host sees this device (or not) */
157 static void pullup_off(void)
158 {
159 struct pxa2xx_udc_mach_info *mach = the_controller->mach;
160 int off_level = mach->gpio_pullup_inverted;
161
162 if (gpio_is_valid(mach->gpio_pullup))
163 gpio_set_value(mach->gpio_pullup, off_level);
164 else if (mach->udc_command)
165 mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
166 }
167
168 static void pullup_on(void)
169 {
170 struct pxa2xx_udc_mach_info *mach = the_controller->mach;
171 int on_level = !mach->gpio_pullup_inverted;
172
173 if (gpio_is_valid(mach->gpio_pullup))
174 gpio_set_value(mach->gpio_pullup, on_level);
175 else if (mach->udc_command)
176 mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
177 }
178
179 static void pio_irq_enable(int bEndpointAddress)
180 {
181 bEndpointAddress &= 0xf;
182 if (bEndpointAddress < 8)
183 UICR0 &= ~(1 << bEndpointAddress);
184 else {
185 bEndpointAddress -= 8;
186 UICR1 &= ~(1 << bEndpointAddress);
187 }
188 }
189
190 static void pio_irq_disable(int bEndpointAddress)
191 {
192 bEndpointAddress &= 0xf;
193 if (bEndpointAddress < 8)
194 UICR0 |= 1 << bEndpointAddress;
195 else {
196 bEndpointAddress -= 8;
197 UICR1 |= 1 << bEndpointAddress;
198 }
199 }
200
201 /* The UDCCR reg contains mask and interrupt status bits,
202 * so using '|=' isn't safe as it may ack an interrupt.
203 */
204 #define UDCCR_MASK_BITS (UDCCR_REM | UDCCR_SRM | UDCCR_UDE)
205
206 static inline void udc_set_mask_UDCCR(int mask)
207 {
208 UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
209 }
210
211 static inline void udc_clear_mask_UDCCR(int mask)
212 {
213 UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
214 }
215
216 static inline void udc_ack_int_UDCCR(int mask)
217 {
218 /* udccr contains the bits we dont want to change */
219 __u32 udccr = UDCCR & UDCCR_MASK_BITS;
220
221 UDCCR = udccr | (mask & ~UDCCR_MASK_BITS);
222 }
223
224 /*
225 * endpoint enable/disable
226 *
227 * we need to verify the descriptors used to enable endpoints. since pxa25x
228 * endpoint configurations are fixed, and are pretty much always enabled,
229 * there's not a lot to manage here.
230 *
231 * because pxa25x can't selectively initialize bulk (or interrupt) endpoints,
232 * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
233 * for a single interface (with only the default altsetting) and for gadget
234 * drivers that don't halt endpoints (not reset by set_interface). that also
235 * means that if you use ISO, you must violate the USB spec rule that all
236 * iso endpoints must be in non-default altsettings.
237 */
238 static int pxa25x_ep_enable (struct usb_ep *_ep,
239 const struct usb_endpoint_descriptor *desc)
240 {
241 struct pxa25x_ep *ep;
242 struct pxa25x_udc *dev;
243
244 ep = container_of (_ep, struct pxa25x_ep, ep);
245 if (!_ep || !desc || ep->desc || _ep->name == ep0name
246 || desc->bDescriptorType != USB_DT_ENDPOINT
247 || ep->bEndpointAddress != desc->bEndpointAddress
248 || ep->fifo_size < le16_to_cpu
249 (desc->wMaxPacketSize)) {
250 DMSG("%s, bad ep or descriptor\n", __func__);
251 return -EINVAL;
252 }
253
254 /* xfer types must match, except that interrupt ~= bulk */
255 if (ep->bmAttributes != desc->bmAttributes
256 && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
257 && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
258 DMSG("%s, %s type mismatch\n", __func__, _ep->name);
259 return -EINVAL;
260 }
261
262 /* hardware _could_ do smaller, but driver doesn't */
263 if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
264 && le16_to_cpu (desc->wMaxPacketSize)
265 != BULK_FIFO_SIZE)
266 || !desc->wMaxPacketSize) {
267 DMSG("%s, bad %s maxpacket\n", __func__, _ep->name);
268 return -ERANGE;
269 }
270
271 dev = ep->dev;
272 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
273 DMSG("%s, bogus device state\n", __func__);
274 return -ESHUTDOWN;
275 }
276
277 ep->desc = desc;
278 ep->stopped = 0;
279 ep->pio_irqs = 0;
280 ep->ep.maxpacket = le16_to_cpu (desc->wMaxPacketSize);
281
282 /* flush fifo (mostly for OUT buffers) */
283 pxa25x_ep_fifo_flush (_ep);
284
285 /* ... reset halt state too, if we could ... */
286
287 DBG(DBG_VERBOSE, "enabled %s\n", _ep->name);
288 return 0;
289 }
290
291 static int pxa25x_ep_disable (struct usb_ep *_ep)
292 {
293 struct pxa25x_ep *ep;
294 unsigned long flags;
295
296 ep = container_of (_ep, struct pxa25x_ep, ep);
297 if (!_ep || !ep->desc) {
298 DMSG("%s, %s not enabled\n", __func__,
299 _ep ? ep->ep.name : NULL);
300 return -EINVAL;
301 }
302 local_irq_save(flags);
303
304 nuke (ep, -ESHUTDOWN);
305
306 /* flush fifo (mostly for IN buffers) */
307 pxa25x_ep_fifo_flush (_ep);
308
309 ep->desc = NULL;
310 ep->stopped = 1;
311
312 local_irq_restore(flags);
313 DBG(DBG_VERBOSE, "%s disabled\n", _ep->name);
314 return 0;
315 }
316
317 /*-------------------------------------------------------------------------*/
318
319 /* for the pxa25x, these can just wrap kmalloc/kfree. gadget drivers
320 * must still pass correctly initialized endpoints, since other controller
321 * drivers may care about how it's currently set up (dma issues etc).
322 */
323
324 /*
325 * pxa25x_ep_alloc_request - allocate a request data structure
326 */
327 static struct usb_request *
328 pxa25x_ep_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
329 {
330 struct pxa25x_request *req;
331
332 req = kzalloc(sizeof(*req), gfp_flags);
333 if (!req)
334 return NULL;
335
336 INIT_LIST_HEAD (&req->queue);
337 return &req->req;
338 }
339
340
341 /*
342 * pxa25x_ep_free_request - deallocate a request data structure
343 */
344 static void
345 pxa25x_ep_free_request (struct usb_ep *_ep, struct usb_request *_req)
346 {
347 struct pxa25x_request *req;
348
349 req = container_of (_req, struct pxa25x_request, req);
350 WARN_ON(!list_empty (&req->queue));
351 kfree(req);
352 }
353
354 /*-------------------------------------------------------------------------*/
355
356 /*
357 * done - retire a request; caller blocked irqs
358 */
359 static void done(struct pxa25x_ep *ep, struct pxa25x_request *req, int status)
360 {
361 unsigned stopped = ep->stopped;
362
363 list_del_init(&req->queue);
364
365 if (likely (req->req.status == -EINPROGRESS))
366 req->req.status = status;
367 else
368 status = req->req.status;
369
370 if (status && status != -ESHUTDOWN)
371 DBG(DBG_VERBOSE, "complete %s req %p stat %d len %u/%u\n",
372 ep->ep.name, &req->req, status,
373 req->req.actual, req->req.length);
374
375 /* don't modify queue heads during completion callback */
376 ep->stopped = 1;
377 req->req.complete(&ep->ep, &req->req);
378 ep->stopped = stopped;
379 }
380
381
382 static inline void ep0_idle (struct pxa25x_udc *dev)
383 {
384 dev->ep0state = EP0_IDLE;
385 }
386
387 static int
388 write_packet(volatile u32 *uddr, struct pxa25x_request *req, unsigned max)
389 {
390 u8 *buf;
391 unsigned length, count;
392
393 buf = req->req.buf + req->req.actual;
394 prefetch(buf);
395
396 /* how big will this packet be? */
397 length = min(req->req.length - req->req.actual, max);
398 req->req.actual += length;
399
400 count = length;
401 while (likely(count--))
402 *uddr = *buf++;
403
404 return length;
405 }
406
407 /*
408 * write to an IN endpoint fifo, as many packets as possible.
409 * irqs will use this to write the rest later.
410 * caller guarantees at least one packet buffer is ready (or a zlp).
411 */
412 static int
413 write_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
414 {
415 unsigned max;
416
417 max = le16_to_cpu(ep->desc->wMaxPacketSize);
418 do {
419 unsigned count;
420 int is_last, is_short;
421
422 count = write_packet(ep->reg_uddr, req, max);
423
424 /* last packet is usually short (or a zlp) */
425 if (unlikely (count != max))
426 is_last = is_short = 1;
427 else {
428 if (likely(req->req.length != req->req.actual)
429 || req->req.zero)
430 is_last = 0;
431 else
432 is_last = 1;
433 /* interrupt/iso maxpacket may not fill the fifo */
434 is_short = unlikely (max < ep->fifo_size);
435 }
436
437 DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n",
438 ep->ep.name, count,
439 is_last ? "/L" : "", is_short ? "/S" : "",
440 req->req.length - req->req.actual, req);
441
442 /* let loose that packet. maybe try writing another one,
443 * double buffering might work. TSP, TPC, and TFS
444 * bit values are the same for all normal IN endpoints.
445 */
446 *ep->reg_udccs = UDCCS_BI_TPC;
447 if (is_short)
448 *ep->reg_udccs = UDCCS_BI_TSP;
449
450 /* requests complete when all IN data is in the FIFO */
451 if (is_last) {
452 done (ep, req, 0);
453 if (list_empty(&ep->queue))
454 pio_irq_disable (ep->bEndpointAddress);
455 return 1;
456 }
457
458 // TODO experiment: how robust can fifo mode tweaking be?
459 // double buffering is off in the default fifo mode, which
460 // prevents TFS from being set here.
461
462 } while (*ep->reg_udccs & UDCCS_BI_TFS);
463 return 0;
464 }
465
466 /* caller asserts req->pending (ep0 irq status nyet cleared); starts
467 * ep0 data stage. these chips want very simple state transitions.
468 */
469 static inline
470 void ep0start(struct pxa25x_udc *dev, u32 flags, const char *tag)
471 {
472 UDCCS0 = flags|UDCCS0_SA|UDCCS0_OPR;
473 USIR0 = USIR0_IR0;
474 dev->req_pending = 0;
475 DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n",
476 __func__, tag, UDCCS0, flags);
477 }
478
479 static int
480 write_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
481 {
482 unsigned count;
483 int is_short;
484
485 count = write_packet(&UDDR0, req, EP0_FIFO_SIZE);
486 ep->dev->stats.write.bytes += count;
487
488 /* last packet "must be" short (or a zlp) */
489 is_short = (count != EP0_FIFO_SIZE);
490
491 DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count,
492 req->req.length - req->req.actual, req);
493
494 if (unlikely (is_short)) {
495 if (ep->dev->req_pending)
496 ep0start(ep->dev, UDCCS0_IPR, "short IN");
497 else
498 UDCCS0 = UDCCS0_IPR;
499
500 count = req->req.length;
501 done (ep, req, 0);
502 ep0_idle(ep->dev);
503 #ifndef CONFIG_ARCH_IXP4XX
504 #if 1
505 /* This seems to get rid of lost status irqs in some cases:
506 * host responds quickly, or next request involves config
507 * change automagic, or should have been hidden, or ...
508 *
509 * FIXME get rid of all udelays possible...
510 */
511 if (count >= EP0_FIFO_SIZE) {
512 count = 100;
513 do {
514 if ((UDCCS0 & UDCCS0_OPR) != 0) {
515 /* clear OPR, generate ack */
516 UDCCS0 = UDCCS0_OPR;
517 break;
518 }
519 count--;
520 udelay(1);
521 } while (count);
522 }
523 #endif
524 #endif
525 } else if (ep->dev->req_pending)
526 ep0start(ep->dev, 0, "IN");
527 return is_short;
528 }
529
530
531 /*
532 * read_fifo - unload packet(s) from the fifo we use for usb OUT
533 * transfers and put them into the request. caller should have made
534 * sure there's at least one packet ready.
535 *
536 * returns true if the request completed because of short packet or the
537 * request buffer having filled (and maybe overran till end-of-packet).
538 */
539 static int
540 read_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
541 {
542 for (;;) {
543 u32 udccs;
544 u8 *buf;
545 unsigned bufferspace, count, is_short;
546
547 /* make sure there's a packet in the FIFO.
548 * UDCCS_{BO,IO}_RPC are all the same bit value.
549 * UDCCS_{BO,IO}_RNE are all the same bit value.
550 */
551 udccs = *ep->reg_udccs;
552 if (unlikely ((udccs & UDCCS_BO_RPC) == 0))
553 break;
554 buf = req->req.buf + req->req.actual;
555 prefetchw(buf);
556 bufferspace = req->req.length - req->req.actual;
557
558 /* read all bytes from this packet */
559 if (likely (udccs & UDCCS_BO_RNE)) {
560 count = 1 + (0x0ff & *ep->reg_ubcr);
561 req->req.actual += min (count, bufferspace);
562 } else /* zlp */
563 count = 0;
564 is_short = (count < ep->ep.maxpacket);
565 DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
566 ep->ep.name, udccs, count,
567 is_short ? "/S" : "",
568 req, req->req.actual, req->req.length);
569 while (likely (count-- != 0)) {
570 u8 byte = (u8) *ep->reg_uddr;
571
572 if (unlikely (bufferspace == 0)) {
573 /* this happens when the driver's buffer
574 * is smaller than what the host sent.
575 * discard the extra data.
576 */
577 if (req->req.status != -EOVERFLOW)
578 DMSG("%s overflow %d\n",
579 ep->ep.name, count);
580 req->req.status = -EOVERFLOW;
581 } else {
582 *buf++ = byte;
583 bufferspace--;
584 }
585 }
586 *ep->reg_udccs = UDCCS_BO_RPC;
587 /* RPC/RSP/RNE could now reflect the other packet buffer */
588
589 /* iso is one request per packet */
590 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
591 if (udccs & UDCCS_IO_ROF)
592 req->req.status = -EHOSTUNREACH;
593 /* more like "is_done" */
594 is_short = 1;
595 }
596
597 /* completion */
598 if (is_short || req->req.actual == req->req.length) {
599 done (ep, req, 0);
600 if (list_empty(&ep->queue))
601 pio_irq_disable (ep->bEndpointAddress);
602 return 1;
603 }
604
605 /* finished that packet. the next one may be waiting... */
606 }
607 return 0;
608 }
609
610 /*
611 * special ep0 version of the above. no UBCR0 or double buffering; status
612 * handshaking is magic. most device protocols don't need control-OUT.
613 * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
614 * protocols do use them.
615 */
616 static int
617 read_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)
618 {
619 u8 *buf, byte;
620 unsigned bufferspace;
621
622 buf = req->req.buf + req->req.actual;
623 bufferspace = req->req.length - req->req.actual;
624
625 while (UDCCS0 & UDCCS0_RNE) {
626 byte = (u8) UDDR0;
627
628 if (unlikely (bufferspace == 0)) {
629 /* this happens when the driver's buffer
630 * is smaller than what the host sent.
631 * discard the extra data.
632 */
633 if (req->req.status != -EOVERFLOW)
634 DMSG("%s overflow\n", ep->ep.name);
635 req->req.status = -EOVERFLOW;
636 } else {
637 *buf++ = byte;
638 req->req.actual++;
639 bufferspace--;
640 }
641 }
642
643 UDCCS0 = UDCCS0_OPR | UDCCS0_IPR;
644
645 /* completion */
646 if (req->req.actual >= req->req.length)
647 return 1;
648
649 /* finished that packet. the next one may be waiting... */
650 return 0;
651 }
652
653 /*-------------------------------------------------------------------------*/
654
655 static int
656 pxa25x_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
657 {
658 struct pxa25x_request *req;
659 struct pxa25x_ep *ep;
660 struct pxa25x_udc *dev;
661 unsigned long flags;
662
663 req = container_of(_req, struct pxa25x_request, req);
664 if (unlikely (!_req || !_req->complete || !_req->buf
665 || !list_empty(&req->queue))) {
666 DMSG("%s, bad params\n", __func__);
667 return -EINVAL;
668 }
669
670 ep = container_of(_ep, struct pxa25x_ep, ep);
671 if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
672 DMSG("%s, bad ep\n", __func__);
673 return -EINVAL;
674 }
675
676 dev = ep->dev;
677 if (unlikely (!dev->driver
678 || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
679 DMSG("%s, bogus device state\n", __func__);
680 return -ESHUTDOWN;
681 }
682
683 /* iso is always one packet per request, that's the only way
684 * we can report per-packet status. that also helps with dma.
685 */
686 if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
687 && req->req.length > le16_to_cpu
688 (ep->desc->wMaxPacketSize)))
689 return -EMSGSIZE;
690
691 DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n",
692 _ep->name, _req, _req->length, _req->buf);
693
694 local_irq_save(flags);
695
696 _req->status = -EINPROGRESS;
697 _req->actual = 0;
698
699 /* kickstart this i/o queue? */
700 if (list_empty(&ep->queue) && !ep->stopped) {
701 if (ep->desc == NULL/* ep0 */) {
702 unsigned length = _req->length;
703
704 switch (dev->ep0state) {
705 case EP0_IN_DATA_PHASE:
706 dev->stats.write.ops++;
707 if (write_ep0_fifo(ep, req))
708 req = NULL;
709 break;
710
711 case EP0_OUT_DATA_PHASE:
712 dev->stats.read.ops++;
713 /* messy ... */
714 if (dev->req_config) {
715 DBG(DBG_VERBOSE, "ep0 config ack%s\n",
716 dev->has_cfr ? "" : " raced");
717 if (dev->has_cfr)
718 UDCCFR = UDCCFR_AREN|UDCCFR_ACM
719 |UDCCFR_MB1;
720 done(ep, req, 0);
721 dev->ep0state = EP0_END_XFER;
722 local_irq_restore (flags);
723 return 0;
724 }
725 if (dev->req_pending)
726 ep0start(dev, UDCCS0_IPR, "OUT");
727 if (length == 0 || ((UDCCS0 & UDCCS0_RNE) != 0
728 && read_ep0_fifo(ep, req))) {
729 ep0_idle(dev);
730 done(ep, req, 0);
731 req = NULL;
732 }
733 break;
734
735 default:
736 DMSG("ep0 i/o, odd state %d\n", dev->ep0state);
737 local_irq_restore (flags);
738 return -EL2HLT;
739 }
740 /* can the FIFO can satisfy the request immediately? */
741 } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
742 if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0
743 && write_fifo(ep, req))
744 req = NULL;
745 } else if ((*ep->reg_udccs & UDCCS_BO_RFS) != 0
746 && read_fifo(ep, req)) {
747 req = NULL;
748 }
749
750 if (likely (req && ep->desc))
751 pio_irq_enable(ep->bEndpointAddress);
752 }
753
754 /* pio or dma irq handler advances the queue. */
755 if (likely(req != NULL))
756 list_add_tail(&req->queue, &ep->queue);
757 local_irq_restore(flags);
758
759 return 0;
760 }
761
762
763 /*
764 * nuke - dequeue ALL requests
765 */
766 static void nuke(struct pxa25x_ep *ep, int status)
767 {
768 struct pxa25x_request *req;
769
770 /* called with irqs blocked */
771 while (!list_empty(&ep->queue)) {
772 req = list_entry(ep->queue.next,
773 struct pxa25x_request,
774 queue);
775 done(ep, req, status);
776 }
777 if (ep->desc)
778 pio_irq_disable (ep->bEndpointAddress);
779 }
780
781
782 /* dequeue JUST ONE request */
783 static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
784 {
785 struct pxa25x_ep *ep;
786 struct pxa25x_request *req;
787 unsigned long flags;
788
789 ep = container_of(_ep, struct pxa25x_ep, ep);
790 if (!_ep || ep->ep.name == ep0name)
791 return -EINVAL;
792
793 local_irq_save(flags);
794
795 /* make sure it's actually queued on this endpoint */
796 list_for_each_entry (req, &ep->queue, queue) {
797 if (&req->req == _req)
798 break;
799 }
800 if (&req->req != _req) {
801 local_irq_restore(flags);
802 return -EINVAL;
803 }
804
805 done(ep, req, -ECONNRESET);
806
807 local_irq_restore(flags);
808 return 0;
809 }
810
811 /*-------------------------------------------------------------------------*/
812
813 static int pxa25x_ep_set_halt(struct usb_ep *_ep, int value)
814 {
815 struct pxa25x_ep *ep;
816 unsigned long flags;
817
818 ep = container_of(_ep, struct pxa25x_ep, ep);
819 if (unlikely (!_ep
820 || (!ep->desc && ep->ep.name != ep0name))
821 || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
822 DMSG("%s, bad ep\n", __func__);
823 return -EINVAL;
824 }
825 if (value == 0) {
826 /* this path (reset toggle+halt) is needed to implement
827 * SET_INTERFACE on normal hardware. but it can't be
828 * done from software on the PXA UDC, and the hardware
829 * forgets to do it as part of SET_INTERFACE automagic.
830 */
831 DMSG("only host can clear %s halt\n", _ep->name);
832 return -EROFS;
833 }
834
835 local_irq_save(flags);
836
837 if ((ep->bEndpointAddress & USB_DIR_IN) != 0
838 && ((*ep->reg_udccs & UDCCS_BI_TFS) == 0
839 || !list_empty(&ep->queue))) {
840 local_irq_restore(flags);
841 return -EAGAIN;
842 }
843
844 /* FST bit is the same for control, bulk in, bulk out, interrupt in */
845 *ep->reg_udccs = UDCCS_BI_FST|UDCCS_BI_FTF;
846
847 /* ep0 needs special care */
848 if (!ep->desc) {
849 start_watchdog(ep->dev);
850 ep->dev->req_pending = 0;
851 ep->dev->ep0state = EP0_STALL;
852
853 /* and bulk/intr endpoints like dropping stalls too */
854 } else {
855 unsigned i;
856 for (i = 0; i < 1000; i += 20) {
857 if (*ep->reg_udccs & UDCCS_BI_SST)
858 break;
859 udelay(20);
860 }
861 }
862 local_irq_restore(flags);
863
864 DBG(DBG_VERBOSE, "%s halt\n", _ep->name);
865 return 0;
866 }
867
868 static int pxa25x_ep_fifo_status(struct usb_ep *_ep)
869 {
870 struct pxa25x_ep *ep;
871
872 ep = container_of(_ep, struct pxa25x_ep, ep);
873 if (!_ep) {
874 DMSG("%s, bad ep\n", __func__);
875 return -ENODEV;
876 }
877 /* pxa can't report unclaimed bytes from IN fifos */
878 if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
879 return -EOPNOTSUPP;
880 if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
881 || (*ep->reg_udccs & UDCCS_BO_RFS) == 0)
882 return 0;
883 else
884 return (*ep->reg_ubcr & 0xfff) + 1;
885 }
886
887 static void pxa25x_ep_fifo_flush(struct usb_ep *_ep)
888 {
889 struct pxa25x_ep *ep;
890
891 ep = container_of(_ep, struct pxa25x_ep, ep);
892 if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
893 DMSG("%s, bad ep\n", __func__);
894 return;
895 }
896
897 /* toggle and halt bits stay unchanged */
898
899 /* for OUT, just read and discard the FIFO contents. */
900 if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
901 while (((*ep->reg_udccs) & UDCCS_BO_RNE) != 0)
902 (void) *ep->reg_uddr;
903 return;
904 }
905
906 /* most IN status is the same, but ISO can't stall */
907 *ep->reg_udccs = UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
908 | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
909 ? 0 : UDCCS_BI_SST);
910 }
911
912
913 static struct usb_ep_ops pxa25x_ep_ops = {
914 .enable = pxa25x_ep_enable,
915 .disable = pxa25x_ep_disable,
916
917 .alloc_request = pxa25x_ep_alloc_request,
918 .free_request = pxa25x_ep_free_request,
919
920 .queue = pxa25x_ep_queue,
921 .dequeue = pxa25x_ep_dequeue,
922
923 .set_halt = pxa25x_ep_set_halt,
924 .fifo_status = pxa25x_ep_fifo_status,
925 .fifo_flush = pxa25x_ep_fifo_flush,
926 };
927
928
929 /* ---------------------------------------------------------------------------
930 * device-scoped parts of the api to the usb controller hardware
931 * ---------------------------------------------------------------------------
932 */
933
934 static int pxa25x_udc_get_frame(struct usb_gadget *_gadget)
935 {
936 return ((UFNRH & 0x07) << 8) | (UFNRL & 0xff);
937 }
938
939 static int pxa25x_udc_wakeup(struct usb_gadget *_gadget)
940 {
941 /* host may not have enabled remote wakeup */
942 if ((UDCCS0 & UDCCS0_DRWF) == 0)
943 return -EHOSTUNREACH;
944 udc_set_mask_UDCCR(UDCCR_RSM);
945 return 0;
946 }
947
948 static void stop_activity(struct pxa25x_udc *, struct usb_gadget_driver *);
949 static void udc_enable (struct pxa25x_udc *);
950 static void udc_disable(struct pxa25x_udc *);
951
952 /* We disable the UDC -- and its 48 MHz clock -- whenever it's not
953 * in active use.
954 */
955 static int pullup(struct pxa25x_udc *udc)
956 {
957 int is_active = udc->vbus && udc->pullup && !udc->suspended;
958 DMSG("%s\n", is_active ? "active" : "inactive");
959 if (is_active) {
960 if (!udc->active) {
961 udc->active = 1;
962 /* Enable clock for USB device */
963 clk_enable(udc->clk);
964 udc_enable(udc);
965 }
966 } else {
967 if (udc->active) {
968 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
969 DMSG("disconnect %s\n", udc->driver
970 ? udc->driver->driver.name
971 : "(no driver)");
972 stop_activity(udc, udc->driver);
973 }
974 udc_disable(udc);
975 /* Disable clock for USB device */
976 clk_disable(udc->clk);
977 udc->active = 0;
978 }
979
980 }
981 return 0;
982 }
983
984 /* VBUS reporting logically comes from a transceiver */
985 static int pxa25x_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
986 {
987 struct pxa25x_udc *udc;
988
989 udc = container_of(_gadget, struct pxa25x_udc, gadget);
990 udc->vbus = is_active;
991 DMSG("vbus %s\n", is_active ? "supplied" : "inactive");
992 pullup(udc);
993 return 0;
994 }
995
996 /* drivers may have software control over D+ pullup */
997 static int pxa25x_udc_pullup(struct usb_gadget *_gadget, int is_active)
998 {
999 struct pxa25x_udc *udc;
1000
1001 udc = container_of(_gadget, struct pxa25x_udc, gadget);
1002
1003 /* not all boards support pullup control */
1004 if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command)
1005 return -EOPNOTSUPP;
1006
1007 udc->pullup = (is_active != 0);
1008 pullup(udc);
1009 return 0;
1010 }
1011
1012 /* boards may consume current from VBUS, up to 100-500mA based on config.
1013 * the 500uA suspend ceiling means that exclusively vbus-powered PXA designs
1014 * violate USB specs.
1015 */
1016 static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
1017 {
1018 struct pxa25x_udc *udc;
1019
1020 udc = container_of(_gadget, struct pxa25x_udc, gadget);
1021
1022 if (udc->transceiver)
1023 return otg_set_power(udc->transceiver, mA);
1024 return -EOPNOTSUPP;
1025 }
1026
1027 static const struct usb_gadget_ops pxa25x_udc_ops = {
1028 .get_frame = pxa25x_udc_get_frame,
1029 .wakeup = pxa25x_udc_wakeup,
1030 .vbus_session = pxa25x_udc_vbus_session,
1031 .pullup = pxa25x_udc_pullup,
1032 .vbus_draw = pxa25x_udc_vbus_draw,
1033 };
1034
1035 /*-------------------------------------------------------------------------*/
1036
1037 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1038
1039 static int
1040 udc_seq_show(struct seq_file *m, void *_d)
1041 {
1042 struct pxa25x_udc *dev = m->private;
1043 unsigned long flags;
1044 int i;
1045 u32 tmp;
1046
1047 local_irq_save(flags);
1048
1049 /* basic device status */
1050 seq_printf(m, DRIVER_DESC "\n"
1051 "%s version: %s\nGadget driver: %s\nHost %s\n\n",
1052 driver_name, DRIVER_VERSION SIZE_STR "(pio)",
1053 dev->driver ? dev->driver->driver.name : "(none)",
1054 is_vbus_present() ? "full speed" : "disconnected");
1055
1056 /* registers for device and ep0 */
1057 seq_printf(m,
1058 "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
1059 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
1060
1061 tmp = UDCCR;
1062 seq_printf(m,
1063 "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp,
1064 (tmp & UDCCR_REM) ? " rem" : "",
1065 (tmp & UDCCR_RSTIR) ? " rstir" : "",
1066 (tmp & UDCCR_SRM) ? " srm" : "",
1067 (tmp & UDCCR_SUSIR) ? " susir" : "",
1068 (tmp & UDCCR_RESIR) ? " resir" : "",
1069 (tmp & UDCCR_RSM) ? " rsm" : "",
1070 (tmp & UDCCR_UDA) ? " uda" : "",
1071 (tmp & UDCCR_UDE) ? " ude" : "");
1072
1073 tmp = UDCCS0;
1074 seq_printf(m,
1075 "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp,
1076 (tmp & UDCCS0_SA) ? " sa" : "",
1077 (tmp & UDCCS0_RNE) ? " rne" : "",
1078 (tmp & UDCCS0_FST) ? " fst" : "",
1079 (tmp & UDCCS0_SST) ? " sst" : "",
1080 (tmp & UDCCS0_DRWF) ? " dwrf" : "",
1081 (tmp & UDCCS0_FTF) ? " ftf" : "",
1082 (tmp & UDCCS0_IPR) ? " ipr" : "",
1083 (tmp & UDCCS0_OPR) ? " opr" : "");
1084
1085 if (dev->has_cfr) {
1086 tmp = UDCCFR;
1087 seq_printf(m,
1088 "udccfr %02X =%s%s\n", tmp,
1089 (tmp & UDCCFR_AREN) ? " aren" : "",
1090 (tmp & UDCCFR_ACM) ? " acm" : "");
1091 }
1092
1093 if (!is_vbus_present() || !dev->driver)
1094 goto done;
1095
1096 seq_printf(m, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
1097 dev->stats.write.bytes, dev->stats.write.ops,
1098 dev->stats.read.bytes, dev->stats.read.ops,
1099 dev->stats.irqs);
1100
1101 /* dump endpoint queues */
1102 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1103 struct pxa25x_ep *ep = &dev->ep [i];
1104 struct pxa25x_request *req;
1105
1106 if (i != 0) {
1107 const struct usb_endpoint_descriptor *desc;
1108
1109 desc = ep->desc;
1110 if (!desc)
1111 continue;
1112 tmp = *dev->ep [i].reg_udccs;
1113 seq_printf(m,
1114 "%s max %d %s udccs %02x irqs %lu\n",
1115 ep->ep.name, le16_to_cpu(desc->wMaxPacketSize),
1116 "pio", tmp, ep->pio_irqs);
1117 /* TODO translate all five groups of udccs bits! */
1118
1119 } else /* ep0 should only have one transfer queued */
1120 seq_printf(m, "ep0 max 16 pio irqs %lu\n",
1121 ep->pio_irqs);
1122
1123 if (list_empty(&ep->queue)) {
1124 seq_printf(m, "\t(nothing queued)\n");
1125 continue;
1126 }
1127 list_for_each_entry(req, &ep->queue, queue) {
1128 seq_printf(m,
1129 "\treq %p len %d/%d buf %p\n",
1130 &req->req, req->req.actual,
1131 req->req.length, req->req.buf);
1132 }
1133 }
1134
1135 done:
1136 local_irq_restore(flags);
1137 return 0;
1138 }
1139
1140 static int
1141 udc_debugfs_open(struct inode *inode, struct file *file)
1142 {
1143 return single_open(file, udc_seq_show, inode->i_private);
1144 }
1145
1146 static const struct file_operations debug_fops = {
1147 .open = udc_debugfs_open,
1148 .read = seq_read,
1149 .llseek = seq_lseek,
1150 .release = single_release,
1151 .owner = THIS_MODULE,
1152 };
1153
1154 #define create_debug_files(dev) \
1155 do { \
1156 dev->debugfs_udc = debugfs_create_file(dev->gadget.name, \
1157 S_IRUGO, NULL, dev, &debug_fops); \
1158 } while (0)
1159 #define remove_debug_files(dev) \
1160 do { \
1161 if (dev->debugfs_udc) \
1162 debugfs_remove(dev->debugfs_udc); \
1163 } while (0)
1164
1165 #else /* !CONFIG_USB_GADGET_DEBUG_FILES */
1166
1167 #define create_debug_files(dev) do {} while (0)
1168 #define remove_debug_files(dev) do {} while (0)
1169
1170 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1171
1172 /*-------------------------------------------------------------------------*/
1173
1174 /*
1175 * udc_disable - disable USB device controller
1176 */
1177 static void udc_disable(struct pxa25x_udc *dev)
1178 {
1179 /* block all irqs */
1180 udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
1181 UICR0 = UICR1 = 0xff;
1182 UFNRH = UFNRH_SIM;
1183
1184 /* if hardware supports it, disconnect from usb */
1185 pullup_off();
1186
1187 udc_clear_mask_UDCCR(UDCCR_UDE);
1188
1189 ep0_idle (dev);
1190 dev->gadget.speed = USB_SPEED_UNKNOWN;
1191 }
1192
1193
1194 /*
1195 * udc_reinit - initialize software state
1196 */
1197 static void udc_reinit(struct pxa25x_udc *dev)
1198 {
1199 u32 i;
1200
1201 /* device/ep0 records init */
1202 INIT_LIST_HEAD (&dev->gadget.ep_list);
1203 INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1204 dev->ep0state = EP0_IDLE;
1205
1206 /* basic endpoint records init */
1207 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1208 struct pxa25x_ep *ep = &dev->ep[i];
1209
1210 if (i != 0)
1211 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1212
1213 ep->desc = NULL;
1214 ep->stopped = 0;
1215 INIT_LIST_HEAD (&ep->queue);
1216 ep->pio_irqs = 0;
1217 }
1218
1219 /* the rest was statically initialized, and is read-only */
1220 }
1221
1222 /* until it's enabled, this UDC should be completely invisible
1223 * to any USB host.
1224 */
1225 static void udc_enable (struct pxa25x_udc *dev)
1226 {
1227 udc_clear_mask_UDCCR(UDCCR_UDE);
1228
1229 /* try to clear these bits before we enable the udc */
1230 udc_ack_int_UDCCR(UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR);
1231
1232 ep0_idle(dev);
1233 dev->gadget.speed = USB_SPEED_UNKNOWN;
1234 dev->stats.irqs = 0;
1235
1236 /*
1237 * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
1238 * - enable UDC
1239 * - if RESET is already in progress, ack interrupt
1240 * - unmask reset interrupt
1241 */
1242 udc_set_mask_UDCCR(UDCCR_UDE);
1243 if (!(UDCCR & UDCCR_UDA))
1244 udc_ack_int_UDCCR(UDCCR_RSTIR);
1245
1246 if (dev->has_cfr /* UDC_RES2 is defined */) {
1247 /* pxa255 (a0+) can avoid a set_config race that could
1248 * prevent gadget drivers from configuring correctly
1249 */
1250 UDCCFR = UDCCFR_ACM | UDCCFR_MB1;
1251 } else {
1252 /* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1)
1253 * which could result in missing packets and interrupts.
1254 * supposedly one bit per endpoint, controlling whether it
1255 * double buffers or not; ACM/AREN bits fit into the holes.
1256 * zero bits (like USIR0_IRx) disable double buffering.
1257 */
1258 UDC_RES1 = 0x00;
1259 UDC_RES2 = 0x00;
1260 }
1261
1262 /* enable suspend/resume and reset irqs */
1263 udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);
1264
1265 /* enable ep0 irqs */
1266 UICR0 &= ~UICR0_IM0;
1267
1268 /* if hardware supports it, pullup D+ and wait for reset */
1269 pullup_on();
1270 }
1271
1272
1273 /* when a driver is successfully registered, it will receive
1274 * control requests including set_configuration(), which enables
1275 * non-control requests. then usb traffic follows until a
1276 * disconnect is reported. then a host may connect again, or
1277 * the driver might get unbound.
1278 */
1279 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1280 {
1281 struct pxa25x_udc *dev = the_controller;
1282 int retval;
1283
1284 if (!driver
1285 || driver->speed < USB_SPEED_FULL
1286 || !driver->bind
1287 || !driver->disconnect
1288 || !driver->setup)
1289 return -EINVAL;
1290 if (!dev)
1291 return -ENODEV;
1292 if (dev->driver)
1293 return -EBUSY;
1294
1295 /* first hook up the driver ... */
1296 dev->driver = driver;
1297 dev->gadget.dev.driver = &driver->driver;
1298 dev->pullup = 1;
1299
1300 retval = device_add (&dev->gadget.dev);
1301 if (retval) {
1302 fail:
1303 dev->driver = NULL;
1304 dev->gadget.dev.driver = NULL;
1305 return retval;
1306 }
1307 retval = driver->bind(&dev->gadget);
1308 if (retval) {
1309 DMSG("bind to driver %s --> error %d\n",
1310 driver->driver.name, retval);
1311 device_del (&dev->gadget.dev);
1312 goto fail;
1313 }
1314
1315 /* ... then enable host detection and ep0; and we're ready
1316 * for set_configuration as well as eventual disconnect.
1317 */
1318 DMSG("registered gadget driver '%s'\n", driver->driver.name);
1319
1320 /* connect to bus through transceiver */
1321 if (dev->transceiver) {
1322 retval = otg_set_peripheral(dev->transceiver, &dev->gadget);
1323 if (retval) {
1324 DMSG("can't bind to transceiver\n");
1325 if (driver->unbind)
1326 driver->unbind(&dev->gadget);
1327 goto bind_fail;
1328 }
1329 }
1330
1331 pullup(dev);
1332 dump_state(dev);
1333 return 0;
1334 bind_fail:
1335 return retval;
1336 }
1337 EXPORT_SYMBOL(usb_gadget_register_driver);
1338
1339 static void
1340 stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver)
1341 {
1342 int i;
1343
1344 /* don't disconnect drivers more than once */
1345 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1346 driver = NULL;
1347 dev->gadget.speed = USB_SPEED_UNKNOWN;
1348
1349 /* prevent new request submissions, kill any outstanding requests */
1350 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1351 struct pxa25x_ep *ep = &dev->ep[i];
1352
1353 ep->stopped = 1;
1354 nuke(ep, -ESHUTDOWN);
1355 }
1356 del_timer_sync(&dev->timer);
1357
1358 /* report disconnect; the driver is already quiesced */
1359 if (driver)
1360 driver->disconnect(&dev->gadget);
1361
1362 /* re-init driver-visible data structures */
1363 udc_reinit(dev);
1364 }
1365
1366 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1367 {
1368 struct pxa25x_udc *dev = the_controller;
1369
1370 if (!dev)
1371 return -ENODEV;
1372 if (!driver || driver != dev->driver || !driver->unbind)
1373 return -EINVAL;
1374
1375 local_irq_disable();
1376 dev->pullup = 0;
1377 pullup(dev);
1378 stop_activity(dev, driver);
1379 local_irq_enable();
1380
1381 if (dev->transceiver)
1382 (void) otg_set_peripheral(dev->transceiver, NULL);
1383
1384 driver->unbind(&dev->gadget);
1385 dev->gadget.dev.driver = NULL;
1386 dev->driver = NULL;
1387
1388 device_del (&dev->gadget.dev);
1389
1390 DMSG("unregistered gadget driver '%s'\n", driver->driver.name);
1391 dump_state(dev);
1392 return 0;
1393 }
1394 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1395
1396
1397 /*-------------------------------------------------------------------------*/
1398
1399 #ifdef CONFIG_ARCH_LUBBOCK
1400
1401 /* Lubbock has separate connect and disconnect irqs. More typical designs
1402 * use one GPIO as the VBUS IRQ, and another to control the D+ pullup.
1403 */
1404
1405 static irqreturn_t
1406 lubbock_vbus_irq(int irq, void *_dev)
1407 {
1408 struct pxa25x_udc *dev = _dev;
1409 int vbus;
1410
1411 dev->stats.irqs++;
1412 switch (irq) {
1413 case LUBBOCK_USB_IRQ:
1414 vbus = 1;
1415 disable_irq(LUBBOCK_USB_IRQ);
1416 enable_irq(LUBBOCK_USB_DISC_IRQ);
1417 break;
1418 case LUBBOCK_USB_DISC_IRQ:
1419 vbus = 0;
1420 disable_irq(LUBBOCK_USB_DISC_IRQ);
1421 enable_irq(LUBBOCK_USB_IRQ);
1422 break;
1423 default:
1424 return IRQ_NONE;
1425 }
1426
1427 pxa25x_udc_vbus_session(&dev->gadget, vbus);
1428 return IRQ_HANDLED;
1429 }
1430
1431 #endif
1432
1433 static irqreturn_t udc_vbus_irq(int irq, void *_dev)
1434 {
1435 struct pxa25x_udc *dev = _dev;
1436
1437 pxa25x_udc_vbus_session(&dev->gadget, is_vbus_present());
1438 return IRQ_HANDLED;
1439 }
1440
1441
1442 /*-------------------------------------------------------------------------*/
1443
1444 static inline void clear_ep_state (struct pxa25x_udc *dev)
1445 {
1446 unsigned i;
1447
1448 /* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
1449 * fifos, and pending transactions mustn't be continued in any case.
1450 */
1451 for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
1452 nuke(&dev->ep[i], -ECONNABORTED);
1453 }
1454
1455 static void udc_watchdog(unsigned long _dev)
1456 {
1457 struct pxa25x_udc *dev = (void *)_dev;
1458
1459 local_irq_disable();
1460 if (dev->ep0state == EP0_STALL
1461 && (UDCCS0 & UDCCS0_FST) == 0
1462 && (UDCCS0 & UDCCS0_SST) == 0) {
1463 UDCCS0 = UDCCS0_FST|UDCCS0_FTF;
1464 DBG(DBG_VERBOSE, "ep0 re-stall\n");
1465 start_watchdog(dev);
1466 }
1467 local_irq_enable();
1468 }
1469
1470 static void handle_ep0 (struct pxa25x_udc *dev)
1471 {
1472 u32 udccs0 = UDCCS0;
1473 struct pxa25x_ep *ep = &dev->ep [0];
1474 struct pxa25x_request *req;
1475 union {
1476 struct usb_ctrlrequest r;
1477 u8 raw [8];
1478 u32 word [2];
1479 } u;
1480
1481 if (list_empty(&ep->queue))
1482 req = NULL;
1483 else
1484 req = list_entry(ep->queue.next, struct pxa25x_request, queue);
1485
1486 /* clear stall status */
1487 if (udccs0 & UDCCS0_SST) {
1488 nuke(ep, -EPIPE);
1489 UDCCS0 = UDCCS0_SST;
1490 del_timer(&dev->timer);
1491 ep0_idle(dev);
1492 }
1493
1494 /* previous request unfinished? non-error iff back-to-back ... */
1495 if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
1496 nuke(ep, 0);
1497 del_timer(&dev->timer);
1498 ep0_idle(dev);
1499 }
1500
1501 switch (dev->ep0state) {
1502 case EP0_IDLE:
1503 /* late-breaking status? */
1504 udccs0 = UDCCS0;
1505
1506 /* start control request? */
1507 if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
1508 == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
1509 int i;
1510
1511 nuke (ep, -EPROTO);
1512
1513 /* read SETUP packet */
1514 for (i = 0; i < 8; i++) {
1515 if (unlikely(!(UDCCS0 & UDCCS0_RNE))) {
1516 bad_setup:
1517 DMSG("SETUP %d!\n", i);
1518 goto stall;
1519 }
1520 u.raw [i] = (u8) UDDR0;
1521 }
1522 if (unlikely((UDCCS0 & UDCCS0_RNE) != 0))
1523 goto bad_setup;
1524
1525 got_setup:
1526 DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1527 u.r.bRequestType, u.r.bRequest,
1528 le16_to_cpu(u.r.wValue),
1529 le16_to_cpu(u.r.wIndex),
1530 le16_to_cpu(u.r.wLength));
1531
1532 /* cope with automagic for some standard requests. */
1533 dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
1534 == USB_TYPE_STANDARD;
1535 dev->req_config = 0;
1536 dev->req_pending = 1;
1537 switch (u.r.bRequest) {
1538 /* hardware restricts gadget drivers here! */
1539 case USB_REQ_SET_CONFIGURATION:
1540 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1541 /* reflect hardware's automagic
1542 * up to the gadget driver.
1543 */
1544 config_change:
1545 dev->req_config = 1;
1546 clear_ep_state(dev);
1547 /* if !has_cfr, there's no synch
1548 * else use AREN (later) not SA|OPR
1549 * USIR0_IR0 acts edge sensitive
1550 */
1551 }
1552 break;
1553 /* ... and here, even more ... */
1554 case USB_REQ_SET_INTERFACE:
1555 if (u.r.bRequestType == USB_RECIP_INTERFACE) {
1556 /* udc hardware is broken by design:
1557 * - altsetting may only be zero;
1558 * - hw resets all interfaces' eps;
1559 * - ep reset doesn't include halt(?).
1560 */
1561 DMSG("broken set_interface (%d/%d)\n",
1562 le16_to_cpu(u.r.wIndex),
1563 le16_to_cpu(u.r.wValue));
1564 goto config_change;
1565 }
1566 break;
1567 /* hardware was supposed to hide this */
1568 case USB_REQ_SET_ADDRESS:
1569 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1570 ep0start(dev, 0, "address");
1571 return;
1572 }
1573 break;
1574 }
1575
1576 if (u.r.bRequestType & USB_DIR_IN)
1577 dev->ep0state = EP0_IN_DATA_PHASE;
1578 else
1579 dev->ep0state = EP0_OUT_DATA_PHASE;
1580
1581 i = dev->driver->setup(&dev->gadget, &u.r);
1582 if (i < 0) {
1583 /* hardware automagic preventing STALL... */
1584 if (dev->req_config) {
1585 /* hardware sometimes neglects to tell
1586 * tell us about config change events,
1587 * so later ones may fail...
1588 */
1589 WARNING("config change %02x fail %d?\n",
1590 u.r.bRequest, i);
1591 return;
1592 /* TODO experiment: if has_cfr,
1593 * hardware didn't ACK; maybe we
1594 * could actually STALL!
1595 */
1596 }
1597 DBG(DBG_VERBOSE, "protocol STALL, "
1598 "%02x err %d\n", UDCCS0, i);
1599 stall:
1600 /* the watchdog timer helps deal with cases
1601 * where udc seems to clear FST wrongly, and
1602 * then NAKs instead of STALLing.
1603 */
1604 ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
1605 start_watchdog(dev);
1606 dev->ep0state = EP0_STALL;
1607
1608 /* deferred i/o == no response yet */
1609 } else if (dev->req_pending) {
1610 if (likely(dev->ep0state == EP0_IN_DATA_PHASE
1611 || dev->req_std || u.r.wLength))
1612 ep0start(dev, 0, "defer");
1613 else
1614 ep0start(dev, UDCCS0_IPR, "defer/IPR");
1615 }
1616
1617 /* expect at least one data or status stage irq */
1618 return;
1619
1620 } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
1621 == (UDCCS0_OPR|UDCCS0_SA))) {
1622 unsigned i;
1623
1624 /* pxa210/250 erratum 131 for B0/B1 says RNE lies.
1625 * still observed on a pxa255 a0.
1626 */
1627 DBG(DBG_VERBOSE, "e131\n");
1628 nuke(ep, -EPROTO);
1629
1630 /* read SETUP data, but don't trust it too much */
1631 for (i = 0; i < 8; i++)
1632 u.raw [i] = (u8) UDDR0;
1633 if ((u.r.bRequestType & USB_RECIP_MASK)
1634 > USB_RECIP_OTHER)
1635 goto stall;
1636 if (u.word [0] == 0 && u.word [1] == 0)
1637 goto stall;
1638 goto got_setup;
1639 } else {
1640 /* some random early IRQ:
1641 * - we acked FST
1642 * - IPR cleared
1643 * - OPR got set, without SA (likely status stage)
1644 */
1645 UDCCS0 = udccs0 & (UDCCS0_SA|UDCCS0_OPR);
1646 }
1647 break;
1648 case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR etc */
1649 if (udccs0 & UDCCS0_OPR) {
1650 UDCCS0 = UDCCS0_OPR|UDCCS0_FTF;
1651 DBG(DBG_VERBOSE, "ep0in premature status\n");
1652 if (req)
1653 done(ep, req, 0);
1654 ep0_idle(dev);
1655 } else /* irq was IPR clearing */ {
1656 if (req) {
1657 /* this IN packet might finish the request */
1658 (void) write_ep0_fifo(ep, req);
1659 } /* else IN token before response was written */
1660 }
1661 break;
1662 case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR etc */
1663 if (udccs0 & UDCCS0_OPR) {
1664 if (req) {
1665 /* this OUT packet might finish the request */
1666 if (read_ep0_fifo(ep, req))
1667 done(ep, req, 0);
1668 /* else more OUT packets expected */
1669 } /* else OUT token before read was issued */
1670 } else /* irq was IPR clearing */ {
1671 DBG(DBG_VERBOSE, "ep0out premature status\n");
1672 if (req)
1673 done(ep, req, 0);
1674 ep0_idle(dev);
1675 }
1676 break;
1677 case EP0_END_XFER:
1678 if (req)
1679 done(ep, req, 0);
1680 /* ack control-IN status (maybe in-zlp was skipped)
1681 * also appears after some config change events.
1682 */
1683 if (udccs0 & UDCCS0_OPR)
1684 UDCCS0 = UDCCS0_OPR;
1685 ep0_idle(dev);
1686 break;
1687 case EP0_STALL:
1688 UDCCS0 = UDCCS0_FST;
1689 break;
1690 }
1691 USIR0 = USIR0_IR0;
1692 }
1693
1694 static void handle_ep(struct pxa25x_ep *ep)
1695 {
1696 struct pxa25x_request *req;
1697 int is_in = ep->bEndpointAddress & USB_DIR_IN;
1698 int completed;
1699 u32 udccs, tmp;
1700
1701 do {
1702 completed = 0;
1703 if (likely (!list_empty(&ep->queue)))
1704 req = list_entry(ep->queue.next,
1705 struct pxa25x_request, queue);
1706 else
1707 req = NULL;
1708
1709 // TODO check FST handling
1710
1711 udccs = *ep->reg_udccs;
1712 if (unlikely(is_in)) { /* irq from TPC, SST, or (ISO) TUR */
1713 tmp = UDCCS_BI_TUR;
1714 if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1715 tmp |= UDCCS_BI_SST;
1716 tmp &= udccs;
1717 if (likely (tmp))
1718 *ep->reg_udccs = tmp;
1719 if (req && likely ((udccs & UDCCS_BI_TFS) != 0))
1720 completed = write_fifo(ep, req);
1721
1722 } else { /* irq from RPC (or for ISO, ROF) */
1723 if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1724 tmp = UDCCS_BO_SST | UDCCS_BO_DME;
1725 else
1726 tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
1727 tmp &= udccs;
1728 if (likely(tmp))
1729 *ep->reg_udccs = tmp;
1730
1731 /* fifos can hold packets, ready for reading... */
1732 if (likely(req)) {
1733 completed = read_fifo(ep, req);
1734 } else
1735 pio_irq_disable (ep->bEndpointAddress);
1736 }
1737 ep->pio_irqs++;
1738 } while (completed);
1739 }
1740
1741 /*
1742 * pxa25x_udc_irq - interrupt handler
1743 *
1744 * avoid delays in ep0 processing. the control handshaking isn't always
1745 * under software control (pxa250c0 and the pxa255 are better), and delays
1746 * could cause usb protocol errors.
1747 */
1748 static irqreturn_t
1749 pxa25x_udc_irq(int irq, void *_dev)
1750 {
1751 struct pxa25x_udc *dev = _dev;
1752 int handled;
1753
1754 dev->stats.irqs++;
1755 do {
1756 u32 udccr = UDCCR;
1757
1758 handled = 0;
1759
1760 /* SUSpend Interrupt Request */
1761 if (unlikely(udccr & UDCCR_SUSIR)) {
1762 udc_ack_int_UDCCR(UDCCR_SUSIR);
1763 handled = 1;
1764 DBG(DBG_VERBOSE, "USB suspend%s\n", is_vbus_present()
1765 ? "" : "+disconnect");
1766
1767 if (!is_vbus_present())
1768 stop_activity(dev, dev->driver);
1769 else if (dev->gadget.speed != USB_SPEED_UNKNOWN
1770 && dev->driver
1771 && dev->driver->suspend)
1772 dev->driver->suspend(&dev->gadget);
1773 ep0_idle (dev);
1774 }
1775
1776 /* RESume Interrupt Request */
1777 if (unlikely(udccr & UDCCR_RESIR)) {
1778 udc_ack_int_UDCCR(UDCCR_RESIR);
1779 handled = 1;
1780 DBG(DBG_VERBOSE, "USB resume\n");
1781
1782 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1783 && dev->driver
1784 && dev->driver->resume
1785 && is_vbus_present())
1786 dev->driver->resume(&dev->gadget);
1787 }
1788
1789 /* ReSeT Interrupt Request - USB reset */
1790 if (unlikely(udccr & UDCCR_RSTIR)) {
1791 udc_ack_int_UDCCR(UDCCR_RSTIR);
1792 handled = 1;
1793
1794 if ((UDCCR & UDCCR_UDA) == 0) {
1795 DBG(DBG_VERBOSE, "USB reset start\n");
1796
1797 /* reset driver and endpoints,
1798 * in case that's not yet done
1799 */
1800 stop_activity (dev, dev->driver);
1801
1802 } else {
1803 DBG(DBG_VERBOSE, "USB reset end\n");
1804 dev->gadget.speed = USB_SPEED_FULL;
1805 memset(&dev->stats, 0, sizeof dev->stats);
1806 /* driver and endpoints are still reset */
1807 }
1808
1809 } else {
1810 u32 usir0 = USIR0 & ~UICR0;
1811 u32 usir1 = USIR1 & ~UICR1;
1812 int i;
1813
1814 if (unlikely (!usir0 && !usir1))
1815 continue;
1816
1817 DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0);
1818
1819 /* control traffic */
1820 if (usir0 & USIR0_IR0) {
1821 dev->ep[0].pio_irqs++;
1822 handle_ep0(dev);
1823 handled = 1;
1824 }
1825
1826 /* endpoint data transfers */
1827 for (i = 0; i < 8; i++) {
1828 u32 tmp = 1 << i;
1829
1830 if (i && (usir0 & tmp)) {
1831 handle_ep(&dev->ep[i]);
1832 USIR0 |= tmp;
1833 handled = 1;
1834 }
1835 #ifndef CONFIG_USB_PXA25X_SMALL
1836 if (usir1 & tmp) {
1837 handle_ep(&dev->ep[i+8]);
1838 USIR1 |= tmp;
1839 handled = 1;
1840 }
1841 #endif
1842 }
1843 }
1844
1845 /* we could also ask for 1 msec SOF (SIR) interrupts */
1846
1847 } while (handled);
1848 return IRQ_HANDLED;
1849 }
1850
1851 /*-------------------------------------------------------------------------*/
1852
1853 static void nop_release (struct device *dev)
1854 {
1855 DMSG("%s %s\n", __func__, dev_name(dev));
1856 }
1857
1858 /* this uses load-time allocation and initialization (instead of
1859 * doing it at run-time) to save code, eliminate fault paths, and
1860 * be more obviously correct.
1861 */
1862 static struct pxa25x_udc memory = {
1863 .gadget = {
1864 .ops = &pxa25x_udc_ops,
1865 .ep0 = &memory.ep[0].ep,
1866 .name = driver_name,
1867 .dev = {
1868 .init_name = "gadget",
1869 .release = nop_release,
1870 },
1871 },
1872
1873 /* control endpoint */
1874 .ep[0] = {
1875 .ep = {
1876 .name = ep0name,
1877 .ops = &pxa25x_ep_ops,
1878 .maxpacket = EP0_FIFO_SIZE,
1879 },
1880 .dev = &memory,
1881 .reg_udccs = &UDCCS0,
1882 .reg_uddr = &UDDR0,
1883 },
1884
1885 /* first group of endpoints */
1886 .ep[1] = {
1887 .ep = {
1888 .name = "ep1in-bulk",
1889 .ops = &pxa25x_ep_ops,
1890 .maxpacket = BULK_FIFO_SIZE,
1891 },
1892 .dev = &memory,
1893 .fifo_size = BULK_FIFO_SIZE,
1894 .bEndpointAddress = USB_DIR_IN | 1,
1895 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1896 .reg_udccs = &UDCCS1,
1897 .reg_uddr = &UDDR1,
1898 },
1899 .ep[2] = {
1900 .ep = {
1901 .name = "ep2out-bulk",
1902 .ops = &pxa25x_ep_ops,
1903 .maxpacket = BULK_FIFO_SIZE,
1904 },
1905 .dev = &memory,
1906 .fifo_size = BULK_FIFO_SIZE,
1907 .bEndpointAddress = 2,
1908 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1909 .reg_udccs = &UDCCS2,
1910 .reg_ubcr = &UBCR2,
1911 .reg_uddr = &UDDR2,
1912 },
1913 #ifndef CONFIG_USB_PXA25X_SMALL
1914 .ep[3] = {
1915 .ep = {
1916 .name = "ep3in-iso",
1917 .ops = &pxa25x_ep_ops,
1918 .maxpacket = ISO_FIFO_SIZE,
1919 },
1920 .dev = &memory,
1921 .fifo_size = ISO_FIFO_SIZE,
1922 .bEndpointAddress = USB_DIR_IN | 3,
1923 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1924 .reg_udccs = &UDCCS3,
1925 .reg_uddr = &UDDR3,
1926 },
1927 .ep[4] = {
1928 .ep = {
1929 .name = "ep4out-iso",
1930 .ops = &pxa25x_ep_ops,
1931 .maxpacket = ISO_FIFO_SIZE,
1932 },
1933 .dev = &memory,
1934 .fifo_size = ISO_FIFO_SIZE,
1935 .bEndpointAddress = 4,
1936 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1937 .reg_udccs = &UDCCS4,
1938 .reg_ubcr = &UBCR4,
1939 .reg_uddr = &UDDR4,
1940 },
1941 .ep[5] = {
1942 .ep = {
1943 .name = "ep5in-int",
1944 .ops = &pxa25x_ep_ops,
1945 .maxpacket = INT_FIFO_SIZE,
1946 },
1947 .dev = &memory,
1948 .fifo_size = INT_FIFO_SIZE,
1949 .bEndpointAddress = USB_DIR_IN | 5,
1950 .bmAttributes = USB_ENDPOINT_XFER_INT,
1951 .reg_udccs = &UDCCS5,
1952 .reg_uddr = &UDDR5,
1953 },
1954
1955 /* second group of endpoints */
1956 .ep[6] = {
1957 .ep = {
1958 .name = "ep6in-bulk",
1959 .ops = &pxa25x_ep_ops,
1960 .maxpacket = BULK_FIFO_SIZE,
1961 },
1962 .dev = &memory,
1963 .fifo_size = BULK_FIFO_SIZE,
1964 .bEndpointAddress = USB_DIR_IN | 6,
1965 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1966 .reg_udccs = &UDCCS6,
1967 .reg_uddr = &UDDR6,
1968 },
1969 .ep[7] = {
1970 .ep = {
1971 .name = "ep7out-bulk",
1972 .ops = &pxa25x_ep_ops,
1973 .maxpacket = BULK_FIFO_SIZE,
1974 },
1975 .dev = &memory,
1976 .fifo_size = BULK_FIFO_SIZE,
1977 .bEndpointAddress = 7,
1978 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1979 .reg_udccs = &UDCCS7,
1980 .reg_ubcr = &UBCR7,
1981 .reg_uddr = &UDDR7,
1982 },
1983 .ep[8] = {
1984 .ep = {
1985 .name = "ep8in-iso",
1986 .ops = &pxa25x_ep_ops,
1987 .maxpacket = ISO_FIFO_SIZE,
1988 },
1989 .dev = &memory,
1990 .fifo_size = ISO_FIFO_SIZE,
1991 .bEndpointAddress = USB_DIR_IN | 8,
1992 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1993 .reg_udccs = &UDCCS8,
1994 .reg_uddr = &UDDR8,
1995 },
1996 .ep[9] = {
1997 .ep = {
1998 .name = "ep9out-iso",
1999 .ops = &pxa25x_ep_ops,
2000 .maxpacket = ISO_FIFO_SIZE,
2001 },
2002 .dev = &memory,
2003 .fifo_size = ISO_FIFO_SIZE,
2004 .bEndpointAddress = 9,
2005 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
2006 .reg_udccs = &UDCCS9,
2007 .reg_ubcr = &UBCR9,
2008 .reg_uddr = &UDDR9,
2009 },
2010 .ep[10] = {
2011 .ep = {
2012 .name = "ep10in-int",
2013 .ops = &pxa25x_ep_ops,
2014 .maxpacket = INT_FIFO_SIZE,
2015 },
2016 .dev = &memory,
2017 .fifo_size = INT_FIFO_SIZE,
2018 .bEndpointAddress = USB_DIR_IN | 10,
2019 .bmAttributes = USB_ENDPOINT_XFER_INT,
2020 .reg_udccs = &UDCCS10,
2021 .reg_uddr = &UDDR10,
2022 },
2023
2024 /* third group of endpoints */
2025 .ep[11] = {
2026 .ep = {
2027 .name = "ep11in-bulk",
2028 .ops = &pxa25x_ep_ops,
2029 .maxpacket = BULK_FIFO_SIZE,
2030 },
2031 .dev = &memory,
2032 .fifo_size = BULK_FIFO_SIZE,
2033 .bEndpointAddress = USB_DIR_IN | 11,
2034 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2035 .reg_udccs = &UDCCS11,
2036 .reg_uddr = &UDDR11,
2037 },
2038 .ep[12] = {
2039 .ep = {
2040 .name = "ep12out-bulk",
2041 .ops = &pxa25x_ep_ops,
2042 .maxpacket = BULK_FIFO_SIZE,
2043 },
2044 .dev = &memory,
2045 .fifo_size = BULK_FIFO_SIZE,
2046 .bEndpointAddress = 12,
2047 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2048 .reg_udccs = &UDCCS12,
2049 .reg_ubcr = &UBCR12,
2050 .reg_uddr = &UDDR12,
2051 },
2052 .ep[13] = {
2053 .ep = {
2054 .name = "ep13in-iso",
2055 .ops = &pxa25x_ep_ops,
2056 .maxpacket = ISO_FIFO_SIZE,
2057 },
2058 .dev = &memory,
2059 .fifo_size = ISO_FIFO_SIZE,
2060 .bEndpointAddress = USB_DIR_IN | 13,
2061 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
2062 .reg_udccs = &UDCCS13,
2063 .reg_uddr = &UDDR13,
2064 },
2065 .ep[14] = {
2066 .ep = {
2067 .name = "ep14out-iso",
2068 .ops = &pxa25x_ep_ops,
2069 .maxpacket = ISO_FIFO_SIZE,
2070 },
2071 .dev = &memory,
2072 .fifo_size = ISO_FIFO_SIZE,
2073 .bEndpointAddress = 14,
2074 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
2075 .reg_udccs = &UDCCS14,
2076 .reg_ubcr = &UBCR14,
2077 .reg_uddr = &UDDR14,
2078 },
2079 .ep[15] = {
2080 .ep = {
2081 .name = "ep15in-int",
2082 .ops = &pxa25x_ep_ops,
2083 .maxpacket = INT_FIFO_SIZE,
2084 },
2085 .dev = &memory,
2086 .fifo_size = INT_FIFO_SIZE,
2087 .bEndpointAddress = USB_DIR_IN | 15,
2088 .bmAttributes = USB_ENDPOINT_XFER_INT,
2089 .reg_udccs = &UDCCS15,
2090 .reg_uddr = &UDDR15,
2091 },
2092 #endif /* !CONFIG_USB_PXA25X_SMALL */
2093 };
2094
2095 #define CP15R0_VENDOR_MASK 0xffffe000
2096
2097 #if defined(CONFIG_ARCH_PXA)
2098 #define CP15R0_XSCALE_VALUE 0x69052000 /* intel/arm/xscale */
2099
2100 #elif defined(CONFIG_ARCH_IXP4XX)
2101 #define CP15R0_XSCALE_VALUE 0x69054000 /* intel/arm/ixp4xx */
2102
2103 #endif
2104
2105 #define CP15R0_PROD_MASK 0x000003f0
2106 #define PXA25x 0x00000100 /* and PXA26x */
2107 #define PXA210 0x00000120
2108
2109 #define CP15R0_REV_MASK 0x0000000f
2110
2111 #define CP15R0_PRODREV_MASK (CP15R0_PROD_MASK | CP15R0_REV_MASK)
2112
2113 #define PXA255_A0 0x00000106 /* or PXA260_B1 */
2114 #define PXA250_C0 0x00000105 /* or PXA26x_B0 */
2115 #define PXA250_B2 0x00000104
2116 #define PXA250_B1 0x00000103 /* or PXA260_A0 */
2117 #define PXA250_B0 0x00000102
2118 #define PXA250_A1 0x00000101
2119 #define PXA250_A0 0x00000100
2120
2121 #define PXA210_C0 0x00000125
2122 #define PXA210_B2 0x00000124
2123 #define PXA210_B1 0x00000123
2124 #define PXA210_B0 0x00000122
2125 #define IXP425_A0 0x000001c1
2126 #define IXP425_B0 0x000001f1
2127 #define IXP465_AD 0x00000200
2128
2129 /*
2130 * probe - binds to the platform device
2131 */
2132 static int __init pxa25x_udc_probe(struct platform_device *pdev)
2133 {
2134 struct pxa25x_udc *dev = &memory;
2135 int retval, vbus_irq, irq;
2136 u32 chiprev;
2137
2138 /* insist on Intel/ARM/XScale */
2139 asm("mrc%? p15, 0, %0, c0, c0" : "=r" (chiprev));
2140 if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) {
2141 pr_err("%s: not XScale!\n", driver_name);
2142 return -ENODEV;
2143 }
2144
2145 /* trigger chiprev-specific logic */
2146 switch (chiprev & CP15R0_PRODREV_MASK) {
2147 #if defined(CONFIG_ARCH_PXA)
2148 case PXA255_A0:
2149 dev->has_cfr = 1;
2150 break;
2151 case PXA250_A0:
2152 case PXA250_A1:
2153 /* A0/A1 "not released"; ep 13, 15 unusable */
2154 /* fall through */
2155 case PXA250_B2: case PXA210_B2:
2156 case PXA250_B1: case PXA210_B1:
2157 case PXA250_B0: case PXA210_B0:
2158 /* OUT-DMA is broken ... */
2159 /* fall through */
2160 case PXA250_C0: case PXA210_C0:
2161 break;
2162 #elif defined(CONFIG_ARCH_IXP4XX)
2163 case IXP425_A0:
2164 case IXP425_B0:
2165 case IXP465_AD:
2166 dev->has_cfr = 1;
2167 break;
2168 #endif
2169 default:
2170 pr_err("%s: unrecognized processor: %08x\n",
2171 driver_name, chiprev);
2172 /* iop3xx, ixp4xx, ... */
2173 return -ENODEV;
2174 }
2175
2176 irq = platform_get_irq(pdev, 0);
2177 if (irq < 0)
2178 return -ENODEV;
2179
2180 dev->clk = clk_get(&pdev->dev, NULL);
2181 if (IS_ERR(dev->clk)) {
2182 retval = PTR_ERR(dev->clk);
2183 goto err_clk;
2184 }
2185
2186 pr_debug("%s: IRQ %d%s%s\n", driver_name, irq,
2187 dev->has_cfr ? "" : " (!cfr)",
2188 SIZE_STR "(pio)"
2189 );
2190
2191 /* other non-static parts of init */
2192 dev->dev = &pdev->dev;
2193 dev->mach = pdev->dev.platform_data;
2194
2195 dev->transceiver = otg_get_transceiver();
2196
2197 if (gpio_is_valid(dev->mach->gpio_vbus)) {
2198 if ((retval = gpio_request(dev->mach->gpio_vbus,
2199 "pxa25x_udc GPIO VBUS"))) {
2200 dev_dbg(&pdev->dev,
2201 "can't get vbus gpio %d, err: %d\n",
2202 dev->mach->gpio_vbus, retval);
2203 goto err_gpio_vbus;
2204 }
2205 gpio_direction_input(dev->mach->gpio_vbus);
2206 vbus_irq = gpio_to_irq(dev->mach->gpio_vbus);
2207 } else
2208 vbus_irq = 0;
2209
2210 if (gpio_is_valid(dev->mach->gpio_pullup)) {
2211 if ((retval = gpio_request(dev->mach->gpio_pullup,
2212 "pca25x_udc GPIO PULLUP"))) {
2213 dev_dbg(&pdev->dev,
2214 "can't get pullup gpio %d, err: %d\n",
2215 dev->mach->gpio_pullup, retval);
2216 goto err_gpio_pullup;
2217 }
2218 gpio_direction_output(dev->mach->gpio_pullup, 0);
2219 }
2220
2221 init_timer(&dev->timer);
2222 dev->timer.function = udc_watchdog;
2223 dev->timer.data = (unsigned long) dev;
2224
2225 device_initialize(&dev->gadget.dev);
2226 dev->gadget.dev.parent = &pdev->dev;
2227 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2228
2229 the_controller = dev;
2230 platform_set_drvdata(pdev, dev);
2231
2232 udc_disable(dev);
2233 udc_reinit(dev);
2234
2235 dev->vbus = !!is_vbus_present();
2236
2237 /* irq setup after old hardware state is cleaned up */
2238 retval = request_irq(irq, pxa25x_udc_irq,
2239 IRQF_DISABLED, driver_name, dev);
2240 if (retval != 0) {
2241 pr_err("%s: can't get irq %d, err %d\n",
2242 driver_name, irq, retval);
2243 goto err_irq1;
2244 }
2245 dev->got_irq = 1;
2246
2247 #ifdef CONFIG_ARCH_LUBBOCK
2248 if (machine_is_lubbock()) {
2249 retval = request_irq(LUBBOCK_USB_DISC_IRQ,
2250 lubbock_vbus_irq,
2251 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2252 driver_name, dev);
2253 if (retval != 0) {
2254 pr_err("%s: can't get irq %i, err %d\n",
2255 driver_name, LUBBOCK_USB_DISC_IRQ, retval);
2256 lubbock_fail0:
2257 goto err_irq_lub;
2258 }
2259 retval = request_irq(LUBBOCK_USB_IRQ,
2260 lubbock_vbus_irq,
2261 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2262 driver_name, dev);
2263 if (retval != 0) {
2264 pr_err("%s: can't get irq %i, err %d\n",
2265 driver_name, LUBBOCK_USB_IRQ, retval);
2266 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2267 goto lubbock_fail0;
2268 }
2269 } else
2270 #endif
2271 if (vbus_irq) {
2272 retval = request_irq(vbus_irq, udc_vbus_irq,
2273 IRQF_DISABLED | IRQF_SAMPLE_RANDOM |
2274 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
2275 driver_name, dev);
2276 if (retval != 0) {
2277 pr_err("%s: can't get irq %i, err %d\n",
2278 driver_name, vbus_irq, retval);
2279 goto err_vbus_irq;
2280 }
2281 }
2282 create_debug_files(dev);
2283
2284 return 0;
2285
2286 err_vbus_irq:
2287 #ifdef CONFIG_ARCH_LUBBOCK
2288 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2289 err_irq_lub:
2290 #endif
2291 free_irq(irq, dev);
2292 err_irq1:
2293 if (gpio_is_valid(dev->mach->gpio_pullup))
2294 gpio_free(dev->mach->gpio_pullup);
2295 err_gpio_pullup:
2296 if (gpio_is_valid(dev->mach->gpio_vbus))
2297 gpio_free(dev->mach->gpio_vbus);
2298 err_gpio_vbus:
2299 if (dev->transceiver) {
2300 otg_put_transceiver(dev->transceiver);
2301 dev->transceiver = NULL;
2302 }
2303 clk_put(dev->clk);
2304 err_clk:
2305 return retval;
2306 }
2307
2308 static void pxa25x_udc_shutdown(struct platform_device *_dev)
2309 {
2310 pullup_off();
2311 }
2312
2313 static int __exit pxa25x_udc_remove(struct platform_device *pdev)
2314 {
2315 struct pxa25x_udc *dev = platform_get_drvdata(pdev);
2316
2317 if (dev->driver)
2318 return -EBUSY;
2319
2320 dev->pullup = 0;
2321 pullup(dev);
2322
2323 remove_debug_files(dev);
2324
2325 if (dev->got_irq) {
2326 free_irq(platform_get_irq(pdev, 0), dev);
2327 dev->got_irq = 0;
2328 }
2329 #ifdef CONFIG_ARCH_LUBBOCK
2330 if (machine_is_lubbock()) {
2331 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2332 free_irq(LUBBOCK_USB_IRQ, dev);
2333 }
2334 #endif
2335 if (gpio_is_valid(dev->mach->gpio_vbus)) {
2336 free_irq(gpio_to_irq(dev->mach->gpio_vbus), dev);
2337 gpio_free(dev->mach->gpio_vbus);
2338 }
2339 if (gpio_is_valid(dev->mach->gpio_pullup))
2340 gpio_free(dev->mach->gpio_pullup);
2341
2342 clk_put(dev->clk);
2343
2344 if (dev->transceiver) {
2345 otg_put_transceiver(dev->transceiver);
2346 dev->transceiver = NULL;
2347 }
2348
2349 platform_set_drvdata(pdev, NULL);
2350 the_controller = NULL;
2351 return 0;
2352 }
2353
2354 /*-------------------------------------------------------------------------*/
2355
2356 #ifdef CONFIG_PM
2357
2358 /* USB suspend (controlled by the host) and system suspend (controlled
2359 * by the PXA) don't necessarily work well together. If USB is active,
2360 * the 48 MHz clock is required; so the system can't enter 33 MHz idle
2361 * mode, or any deeper PM saving state.
2362 *
2363 * For now, we punt and forcibly disconnect from the USB host when PXA
2364 * enters any suspend state. While we're disconnected, we always disable
2365 * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states.
2366 * Boards without software pullup control shouldn't use those states.
2367 * VBUS IRQs should probably be ignored so that the PXA device just acts
2368 * "dead" to USB hosts until system resume.
2369 */
2370 static int pxa25x_udc_suspend(struct platform_device *dev, pm_message_t state)
2371 {
2372 struct pxa25x_udc *udc = platform_get_drvdata(dev);
2373 unsigned long flags;
2374
2375 if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command)
2376 WARNING("USB host won't detect disconnect!\n");
2377 udc->suspended = 1;
2378
2379 local_irq_save(flags);
2380 pullup(udc);
2381 local_irq_restore(flags);
2382
2383 return 0;
2384 }
2385
2386 static int pxa25x_udc_resume(struct platform_device *dev)
2387 {
2388 struct pxa25x_udc *udc = platform_get_drvdata(dev);
2389 unsigned long flags;
2390
2391 udc->suspended = 0;
2392 local_irq_save(flags);
2393 pullup(udc);
2394 local_irq_restore(flags);
2395
2396 return 0;
2397 }
2398
2399 #else
2400 #define pxa25x_udc_suspend NULL
2401 #define pxa25x_udc_resume NULL
2402 #endif
2403
2404 /*-------------------------------------------------------------------------*/
2405
2406 static struct platform_driver udc_driver = {
2407 .shutdown = pxa25x_udc_shutdown,
2408 .remove = __exit_p(pxa25x_udc_remove),
2409 .suspend = pxa25x_udc_suspend,
2410 .resume = pxa25x_udc_resume,
2411 .driver = {
2412 .owner = THIS_MODULE,
2413 .name = "pxa25x-udc",
2414 },
2415 };
2416
2417 static int __init udc_init(void)
2418 {
2419 pr_info("%s: version %s\n", driver_name, DRIVER_VERSION);
2420 return platform_driver_probe(&udc_driver, pxa25x_udc_probe);
2421 }
2422 module_init(udc_init);
2423
2424 static void __exit udc_exit(void)
2425 {
2426 platform_driver_unregister(&udc_driver);
2427 }
2428 module_exit(udc_exit);
2429
2430 MODULE_DESCRIPTION(DRIVER_DESC);
2431 MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
2432 MODULE_LICENSE("GPL");
2433 MODULE_ALIAS("platform:pxa25x-udc");
mm of the moment repository