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USB: don't explicitly reenable root-hub status interrupts
[linux-2.6/mini2440.git] / drivers / usb / gadget / pxa2xx_udc.c
blobc00cd8b9d3d1bb359c78f7a2b2c934dc0d10648a
1 /*
2 * linux/drivers/usb/gadget/pxa2xx_udc.c
3 * Intel PXA25x and IXP4xx on-chip full speed USB device controllers
4 *
5 * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker)
6 * Copyright (C) 2003 Robert Schwebel, Pengutronix
7 * Copyright (C) 2003 Benedikt Spranger, Pengutronix
8 * Copyright (C) 2003 David Brownell
9 * Copyright (C) 2003 Joshua Wise
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 *
25 */
26
27 /* #define VERBOSE_DEBUG */
28
29 #include <linux/device.h>
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/ioport.h>
33 #include <linux/types.h>
34 #include <linux/errno.h>
35 #include <linux/delay.h>
36 #include <linux/slab.h>
37 #include <linux/init.h>
38 #include <linux/timer.h>
39 #include <linux/list.h>
40 #include <linux/interrupt.h>
41 #include <linux/mm.h>
42 #include <linux/platform_device.h>
43 #include <linux/dma-mapping.h>
44 #include <linux/irq.h>
45 #include <linux/clk.h>
46 #include <linux/err.h>
47 #include <linux/seq_file.h>
48 #include <linux/debugfs.h>
49
50 #include <asm/byteorder.h>
51 #include <asm/dma.h>
52 #include <asm/gpio.h>
53 #include <asm/io.h>
54 #include <asm/system.h>
55 #include <asm/mach-types.h>
56 #include <asm/unaligned.h>
57 #include <asm/hardware.h>
58
59 #include <linux/usb/ch9.h>
60 #include <linux/usb/gadget.h>
61
62 #include <asm/mach/udc_pxa2xx.h>
63
64
65 /*
66 * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x
67 * series processors. The UDC for the IXP 4xx series is very similar.
68 * There are fifteen endpoints, in addition to ep0.
69 *
70 * Such controller drivers work with a gadget driver. The gadget driver
71 * returns descriptors, implements configuration and data protocols used
72 * by the host to interact with this device, and allocates endpoints to
73 * the different protocol interfaces. The controller driver virtualizes
74 * usb hardware so that the gadget drivers will be more portable.
75 *
76 * This UDC hardware wants to implement a bit too much USB protocol, so
77 * it constrains the sorts of USB configuration change events that work.
78 * The errata for these chips are misleading; some "fixed" bugs from
79 * pxa250 a0/a1 b0/b1/b2 sure act like they're still there.
80 *
81 * Note that the UDC hardware supports DMA (except on IXP) but that's
82 * not used here. IN-DMA (to host) is simple enough, when the data is
83 * suitably aligned (16 bytes) ... the network stack doesn't do that,
84 * other software can. OUT-DMA is buggy in most chip versions, as well
85 * as poorly designed (data toggle not automatic). So this driver won't
86 * bother using DMA. (Mostly-working IN-DMA support was available in
87 * kernels before 2.6.23, but was never enabled or well tested.)
88 */
89
90 #define DRIVER_VERSION "30-June-2007"
91 #define DRIVER_DESC "PXA 25x USB Device Controller driver"
92
93
94 static const char driver_name [] = "pxa2xx_udc";
95
96 static const char ep0name [] = "ep0";
97
98
99 #ifdef CONFIG_ARCH_IXP4XX
100
101 /* cpu-specific register addresses are compiled in to this code */
102 #ifdef CONFIG_ARCH_PXA
103 #error "Can't configure both IXP and PXA"
104 #endif
105
106 /* IXP doesn't yet support <linux/clk.h> */
107 #define clk_get(dev,name) NULL
108 #define clk_enable(clk) do { } while (0)
109 #define clk_disable(clk) do { } while (0)
110 #define clk_put(clk) do { } while (0)
111
112 #endif
113
114 #include "pxa2xx_udc.h"
115
116
117 #ifdef CONFIG_USB_PXA2XX_SMALL
118 #define SIZE_STR " (small)"
119 #else
120 #define SIZE_STR ""
121 #endif
122
123 /* ---------------------------------------------------------------------------
124 * endpoint related parts of the api to the usb controller hardware,
125 * used by gadget driver; and the inner talker-to-hardware core.
126 * ---------------------------------------------------------------------------
127 */
128
129 static void pxa2xx_ep_fifo_flush (struct usb_ep *ep);
130 static void nuke (struct pxa2xx_ep *, int status);
131
132 /* one GPIO should be used to detect VBUS from the host */
133 static int is_vbus_present(void)
134 {
135 struct pxa2xx_udc_mach_info *mach = the_controller->mach;
136
137 if (mach->gpio_vbus) {
138 int value = gpio_get_value(mach->gpio_vbus);
139 return mach->gpio_vbus_inverted ? !value : value;
140 }
141 if (mach->udc_is_connected)
142 return mach->udc_is_connected();
143 return 1;
144 }
145
146 /* one GPIO should control a D+ pullup, so host sees this device (or not) */
147 static void pullup_off(void)
148 {
149 struct pxa2xx_udc_mach_info *mach = the_controller->mach;
150
151 if (mach->gpio_pullup)
152 gpio_set_value(mach->gpio_pullup, 0);
153 else if (mach->udc_command)
154 mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
155 }
156
157 static void pullup_on(void)
158 {
159 struct pxa2xx_udc_mach_info *mach = the_controller->mach;
160
161 if (mach->gpio_pullup)
162 gpio_set_value(mach->gpio_pullup, 1);
163 else if (mach->udc_command)
164 mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
165 }
166
167 static void pio_irq_enable(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 static void pio_irq_disable(int bEndpointAddress)
179 {
180 bEndpointAddress &= 0xf;
181 if (bEndpointAddress < 8)
182 UICR0 |= 1 << bEndpointAddress;
183 else {
184 bEndpointAddress -= 8;
185 UICR1 |= 1 << bEndpointAddress;
186 }
187 }
188
189 /* The UDCCR reg contains mask and interrupt status bits,
190 * so using '|=' isn't safe as it may ack an interrupt.
191 */
192 #define UDCCR_MASK_BITS (UDCCR_REM | UDCCR_SRM | UDCCR_UDE)
193
194 static inline void udc_set_mask_UDCCR(int mask)
195 {
196 UDCCR = (UDCCR & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS);
197 }
198
199 static inline void udc_clear_mask_UDCCR(int mask)
200 {
201 UDCCR = (UDCCR & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS);
202 }
203
204 static inline void udc_ack_int_UDCCR(int mask)
205 {
206 /* udccr contains the bits we dont want to change */
207 __u32 udccr = UDCCR & UDCCR_MASK_BITS;
208
209 UDCCR = udccr | (mask & ~UDCCR_MASK_BITS);
210 }
211
212 /*
213 * endpoint enable/disable
214 *
215 * we need to verify the descriptors used to enable endpoints. since pxa2xx
216 * endpoint configurations are fixed, and are pretty much always enabled,
217 * there's not a lot to manage here.
218 *
219 * because pxa2xx can't selectively initialize bulk (or interrupt) endpoints,
220 * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except
221 * for a single interface (with only the default altsetting) and for gadget
222 * drivers that don't halt endpoints (not reset by set_interface). that also
223 * means that if you use ISO, you must violate the USB spec rule that all
224 * iso endpoints must be in non-default altsettings.
225 */
226 static int pxa2xx_ep_enable (struct usb_ep *_ep,
227 const struct usb_endpoint_descriptor *desc)
228 {
229 struct pxa2xx_ep *ep;
230 struct pxa2xx_udc *dev;
231
232 ep = container_of (_ep, struct pxa2xx_ep, ep);
233 if (!_ep || !desc || ep->desc || _ep->name == ep0name
234 || desc->bDescriptorType != USB_DT_ENDPOINT
235 || ep->bEndpointAddress != desc->bEndpointAddress
236 || ep->fifo_size < le16_to_cpu
237 (desc->wMaxPacketSize)) {
238 DMSG("%s, bad ep or descriptor\n", __FUNCTION__);
239 return -EINVAL;
240 }
241
242 /* xfer types must match, except that interrupt ~= bulk */
243 if (ep->bmAttributes != desc->bmAttributes
244 && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
245 && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
246 DMSG("%s, %s type mismatch\n", __FUNCTION__, _ep->name);
247 return -EINVAL;
248 }
249
250 /* hardware _could_ do smaller, but driver doesn't */
251 if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK
252 && le16_to_cpu (desc->wMaxPacketSize)
253 != BULK_FIFO_SIZE)
254 || !desc->wMaxPacketSize) {
255 DMSG("%s, bad %s maxpacket\n", __FUNCTION__, _ep->name);
256 return -ERANGE;
257 }
258
259 dev = ep->dev;
260 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
261 DMSG("%s, bogus device state\n", __FUNCTION__);
262 return -ESHUTDOWN;
263 }
264
265 ep->desc = desc;
266 ep->stopped = 0;
267 ep->pio_irqs = 0;
268 ep->ep.maxpacket = le16_to_cpu (desc->wMaxPacketSize);
269
270 /* flush fifo (mostly for OUT buffers) */
271 pxa2xx_ep_fifo_flush (_ep);
272
273 /* ... reset halt state too, if we could ... */
274
275 DBG(DBG_VERBOSE, "enabled %s\n", _ep->name);
276 return 0;
277 }
278
279 static int pxa2xx_ep_disable (struct usb_ep *_ep)
280 {
281 struct pxa2xx_ep *ep;
282 unsigned long flags;
283
284 ep = container_of (_ep, struct pxa2xx_ep, ep);
285 if (!_ep || !ep->desc) {
286 DMSG("%s, %s not enabled\n", __FUNCTION__,
287 _ep ? ep->ep.name : NULL);
288 return -EINVAL;
289 }
290 local_irq_save(flags);
291
292 nuke (ep, -ESHUTDOWN);
293
294 /* flush fifo (mostly for IN buffers) */
295 pxa2xx_ep_fifo_flush (_ep);
296
297 ep->desc = NULL;
298 ep->stopped = 1;
299
300 local_irq_restore(flags);
301 DBG(DBG_VERBOSE, "%s disabled\n", _ep->name);
302 return 0;
303 }
304
305 /*-------------------------------------------------------------------------*/
306
307 /* for the pxa2xx, these can just wrap kmalloc/kfree. gadget drivers
308 * must still pass correctly initialized endpoints, since other controller
309 * drivers may care about how it's currently set up (dma issues etc).
310 */
311
312 /*
313 * pxa2xx_ep_alloc_request - allocate a request data structure
314 */
315 static struct usb_request *
316 pxa2xx_ep_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
317 {
318 struct pxa2xx_request *req;
319
320 req = kzalloc(sizeof(*req), gfp_flags);
321 if (!req)
322 return NULL;
323
324 INIT_LIST_HEAD (&req->queue);
325 return &req->req;
326 }
327
328
329 /*
330 * pxa2xx_ep_free_request - deallocate a request data structure
331 */
332 static void
333 pxa2xx_ep_free_request (struct usb_ep *_ep, struct usb_request *_req)
334 {
335 struct pxa2xx_request *req;
336
337 req = container_of (_req, struct pxa2xx_request, req);
338 WARN_ON (!list_empty (&req->queue));
339 kfree(req);
340 }
341
342 /*-------------------------------------------------------------------------*/
343
344 /*
345 * done - retire a request; caller blocked irqs
346 */
347 static void done(struct pxa2xx_ep *ep, struct pxa2xx_request *req, int status)
348 {
349 unsigned stopped = ep->stopped;
350
351 list_del_init(&req->queue);
352
353 if (likely (req->req.status == -EINPROGRESS))
354 req->req.status = status;
355 else
356 status = req->req.status;
357
358 if (status && status != -ESHUTDOWN)
359 DBG(DBG_VERBOSE, "complete %s req %p stat %d len %u/%u\n",
360 ep->ep.name, &req->req, status,
361 req->req.actual, req->req.length);
362
363 /* don't modify queue heads during completion callback */
364 ep->stopped = 1;
365 req->req.complete(&ep->ep, &req->req);
366 ep->stopped = stopped;
367 }
368
369
370 static inline void ep0_idle (struct pxa2xx_udc *dev)
371 {
372 dev->ep0state = EP0_IDLE;
373 }
374
375 static int
376 write_packet(volatile u32 *uddr, struct pxa2xx_request *req, unsigned max)
377 {
378 u8 *buf;
379 unsigned length, count;
380
381 buf = req->req.buf + req->req.actual;
382 prefetch(buf);
383
384 /* how big will this packet be? */
385 length = min(req->req.length - req->req.actual, max);
386 req->req.actual += length;
387
388 count = length;
389 while (likely(count--))
390 *uddr = *buf++;
391
392 return length;
393 }
394
395 /*
396 * write to an IN endpoint fifo, as many packets as possible.
397 * irqs will use this to write the rest later.
398 * caller guarantees at least one packet buffer is ready (or a zlp).
399 */
400 static int
401 write_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
402 {
403 unsigned max;
404
405 max = le16_to_cpu(ep->desc->wMaxPacketSize);
406 do {
407 unsigned count;
408 int is_last, is_short;
409
410 count = write_packet(ep->reg_uddr, req, max);
411
412 /* last packet is usually short (or a zlp) */
413 if (unlikely (count != max))
414 is_last = is_short = 1;
415 else {
416 if (likely(req->req.length != req->req.actual)
417 || req->req.zero)
418 is_last = 0;
419 else
420 is_last = 1;
421 /* interrupt/iso maxpacket may not fill the fifo */
422 is_short = unlikely (max < ep->fifo_size);
423 }
424
425 DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n",
426 ep->ep.name, count,
427 is_last ? "/L" : "", is_short ? "/S" : "",
428 req->req.length - req->req.actual, req);
429
430 /* let loose that packet. maybe try writing another one,
431 * double buffering might work. TSP, TPC, and TFS
432 * bit values are the same for all normal IN endpoints.
433 */
434 *ep->reg_udccs = UDCCS_BI_TPC;
435 if (is_short)
436 *ep->reg_udccs = UDCCS_BI_TSP;
437
438 /* requests complete when all IN data is in the FIFO */
439 if (is_last) {
440 done (ep, req, 0);
441 if (list_empty(&ep->queue))
442 pio_irq_disable (ep->bEndpointAddress);
443 return 1;
444 }
445
446 // TODO experiment: how robust can fifo mode tweaking be?
447 // double buffering is off in the default fifo mode, which
448 // prevents TFS from being set here.
449
450 } while (*ep->reg_udccs & UDCCS_BI_TFS);
451 return 0;
452 }
453
454 /* caller asserts req->pending (ep0 irq status nyet cleared); starts
455 * ep0 data stage. these chips want very simple state transitions.
456 */
457 static inline
458 void ep0start(struct pxa2xx_udc *dev, u32 flags, const char *tag)
459 {
460 UDCCS0 = flags|UDCCS0_SA|UDCCS0_OPR;
461 USIR0 = USIR0_IR0;
462 dev->req_pending = 0;
463 DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n",
464 __FUNCTION__, tag, UDCCS0, flags);
465 }
466
467 static int
468 write_ep0_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
469 {
470 unsigned count;
471 int is_short;
472
473 count = write_packet(&UDDR0, req, EP0_FIFO_SIZE);
474 ep->dev->stats.write.bytes += count;
475
476 /* last packet "must be" short (or a zlp) */
477 is_short = (count != EP0_FIFO_SIZE);
478
479 DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count,
480 req->req.length - req->req.actual, req);
481
482 if (unlikely (is_short)) {
483 if (ep->dev->req_pending)
484 ep0start(ep->dev, UDCCS0_IPR, "short IN");
485 else
486 UDCCS0 = UDCCS0_IPR;
487
488 count = req->req.length;
489 done (ep, req, 0);
490 ep0_idle(ep->dev);
491 #ifndef CONFIG_ARCH_IXP4XX
492 #if 1
493 /* This seems to get rid of lost status irqs in some cases:
494 * host responds quickly, or next request involves config
495 * change automagic, or should have been hidden, or ...
496 *
497 * FIXME get rid of all udelays possible...
498 */
499 if (count >= EP0_FIFO_SIZE) {
500 count = 100;
501 do {
502 if ((UDCCS0 & UDCCS0_OPR) != 0) {
503 /* clear OPR, generate ack */
504 UDCCS0 = UDCCS0_OPR;
505 break;
506 }
507 count--;
508 udelay(1);
509 } while (count);
510 }
511 #endif
512 #endif
513 } else if (ep->dev->req_pending)
514 ep0start(ep->dev, 0, "IN");
515 return is_short;
516 }
517
518
519 /*
520 * read_fifo - unload packet(s) from the fifo we use for usb OUT
521 * transfers and put them into the request. caller should have made
522 * sure there's at least one packet ready.
523 *
524 * returns true if the request completed because of short packet or the
525 * request buffer having filled (and maybe overran till end-of-packet).
526 */
527 static int
528 read_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
529 {
530 for (;;) {
531 u32 udccs;
532 u8 *buf;
533 unsigned bufferspace, count, is_short;
534
535 /* make sure there's a packet in the FIFO.
536 * UDCCS_{BO,IO}_RPC are all the same bit value.
537 * UDCCS_{BO,IO}_RNE are all the same bit value.
538 */
539 udccs = *ep->reg_udccs;
540 if (unlikely ((udccs & UDCCS_BO_RPC) == 0))
541 break;
542 buf = req->req.buf + req->req.actual;
543 prefetchw(buf);
544 bufferspace = req->req.length - req->req.actual;
545
546 /* read all bytes from this packet */
547 if (likely (udccs & UDCCS_BO_RNE)) {
548 count = 1 + (0x0ff & *ep->reg_ubcr);
549 req->req.actual += min (count, bufferspace);
550 } else /* zlp */
551 count = 0;
552 is_short = (count < ep->ep.maxpacket);
553 DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n",
554 ep->ep.name, udccs, count,
555 is_short ? "/S" : "",
556 req, req->req.actual, req->req.length);
557 while (likely (count-- != 0)) {
558 u8 byte = (u8) *ep->reg_uddr;
559
560 if (unlikely (bufferspace == 0)) {
561 /* this happens when the driver's buffer
562 * is smaller than what the host sent.
563 * discard the extra data.
564 */
565 if (req->req.status != -EOVERFLOW)
566 DMSG("%s overflow %d\n",
567 ep->ep.name, count);
568 req->req.status = -EOVERFLOW;
569 } else {
570 *buf++ = byte;
571 bufferspace--;
572 }
573 }
574 *ep->reg_udccs = UDCCS_BO_RPC;
575 /* RPC/RSP/RNE could now reflect the other packet buffer */
576
577 /* iso is one request per packet */
578 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
579 if (udccs & UDCCS_IO_ROF)
580 req->req.status = -EHOSTUNREACH;
581 /* more like "is_done" */
582 is_short = 1;
583 }
584
585 /* completion */
586 if (is_short || req->req.actual == req->req.length) {
587 done (ep, req, 0);
588 if (list_empty(&ep->queue))
589 pio_irq_disable (ep->bEndpointAddress);
590 return 1;
591 }
592
593 /* finished that packet. the next one may be waiting... */
594 }
595 return 0;
596 }
597
598 /*
599 * special ep0 version of the above. no UBCR0 or double buffering; status
600 * handshaking is magic. most device protocols don't need control-OUT.
601 * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other
602 * protocols do use them.
603 */
604 static int
605 read_ep0_fifo (struct pxa2xx_ep *ep, struct pxa2xx_request *req)
606 {
607 u8 *buf, byte;
608 unsigned bufferspace;
609
610 buf = req->req.buf + req->req.actual;
611 bufferspace = req->req.length - req->req.actual;
612
613 while (UDCCS0 & UDCCS0_RNE) {
614 byte = (u8) UDDR0;
615
616 if (unlikely (bufferspace == 0)) {
617 /* this happens when the driver's buffer
618 * is smaller than what the host sent.
619 * discard the extra data.
620 */
621 if (req->req.status != -EOVERFLOW)
622 DMSG("%s overflow\n", ep->ep.name);
623 req->req.status = -EOVERFLOW;
624 } else {
625 *buf++ = byte;
626 req->req.actual++;
627 bufferspace--;
628 }
629 }
630
631 UDCCS0 = UDCCS0_OPR | UDCCS0_IPR;
632
633 /* completion */
634 if (req->req.actual >= req->req.length)
635 return 1;
636
637 /* finished that packet. the next one may be waiting... */
638 return 0;
639 }
640
641 /*-------------------------------------------------------------------------*/
642
643 static int
644 pxa2xx_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
645 {
646 struct pxa2xx_request *req;
647 struct pxa2xx_ep *ep;
648 struct pxa2xx_udc *dev;
649 unsigned long flags;
650
651 req = container_of(_req, struct pxa2xx_request, req);
652 if (unlikely (!_req || !_req->complete || !_req->buf
653 || !list_empty(&req->queue))) {
654 DMSG("%s, bad params\n", __FUNCTION__);
655 return -EINVAL;
656 }
657
658 ep = container_of(_ep, struct pxa2xx_ep, ep);
659 if (unlikely (!_ep || (!ep->desc && ep->ep.name != ep0name))) {
660 DMSG("%s, bad ep\n", __FUNCTION__);
661 return -EINVAL;
662 }
663
664 dev = ep->dev;
665 if (unlikely (!dev->driver
666 || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
667 DMSG("%s, bogus device state\n", __FUNCTION__);
668 return -ESHUTDOWN;
669 }
670
671 /* iso is always one packet per request, that's the only way
672 * we can report per-packet status. that also helps with dma.
673 */
674 if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC
675 && req->req.length > le16_to_cpu
676 (ep->desc->wMaxPacketSize)))
677 return -EMSGSIZE;
678
679 DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n",
680 _ep->name, _req, _req->length, _req->buf);
681
682 local_irq_save(flags);
683
684 _req->status = -EINPROGRESS;
685 _req->actual = 0;
686
687 /* kickstart this i/o queue? */
688 if (list_empty(&ep->queue) && !ep->stopped) {
689 if (ep->desc == NULL/* ep0 */) {
690 unsigned length = _req->length;
691
692 switch (dev->ep0state) {
693 case EP0_IN_DATA_PHASE:
694 dev->stats.write.ops++;
695 if (write_ep0_fifo(ep, req))
696 req = NULL;
697 break;
698
699 case EP0_OUT_DATA_PHASE:
700 dev->stats.read.ops++;
701 /* messy ... */
702 if (dev->req_config) {
703 DBG(DBG_VERBOSE, "ep0 config ack%s\n",
704 dev->has_cfr ? "" : " raced");
705 if (dev->has_cfr)
706 UDCCFR = UDCCFR_AREN|UDCCFR_ACM
707 |UDCCFR_MB1;
708 done(ep, req, 0);
709 dev->ep0state = EP0_END_XFER;
710 local_irq_restore (flags);
711 return 0;
712 }
713 if (dev->req_pending)
714 ep0start(dev, UDCCS0_IPR, "OUT");
715 if (length == 0 || ((UDCCS0 & UDCCS0_RNE) != 0
716 && read_ep0_fifo(ep, req))) {
717 ep0_idle(dev);
718 done(ep, req, 0);
719 req = NULL;
720 }
721 break;
722
723 default:
724 DMSG("ep0 i/o, odd state %d\n", dev->ep0state);
725 local_irq_restore (flags);
726 return -EL2HLT;
727 }
728 /* can the FIFO can satisfy the request immediately? */
729 } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) {
730 if ((*ep->reg_udccs & UDCCS_BI_TFS) != 0
731 && write_fifo(ep, req))
732 req = NULL;
733 } else if ((*ep->reg_udccs & UDCCS_BO_RFS) != 0
734 && read_fifo(ep, req)) {
735 req = NULL;
736 }
737
738 if (likely (req && ep->desc))
739 pio_irq_enable(ep->bEndpointAddress);
740 }
741
742 /* pio or dma irq handler advances the queue. */
743 if (likely(req != NULL))
744 list_add_tail(&req->queue, &ep->queue);
745 local_irq_restore(flags);
746
747 return 0;
748 }
749
750
751 /*
752 * nuke - dequeue ALL requests
753 */
754 static void nuke(struct pxa2xx_ep *ep, int status)
755 {
756 struct pxa2xx_request *req;
757
758 /* called with irqs blocked */
759 while (!list_empty(&ep->queue)) {
760 req = list_entry(ep->queue.next,
761 struct pxa2xx_request,
762 queue);
763 done(ep, req, status);
764 }
765 if (ep->desc)
766 pio_irq_disable (ep->bEndpointAddress);
767 }
768
769
770 /* dequeue JUST ONE request */
771 static int pxa2xx_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
772 {
773 struct pxa2xx_ep *ep;
774 struct pxa2xx_request *req;
775 unsigned long flags;
776
777 ep = container_of(_ep, struct pxa2xx_ep, ep);
778 if (!_ep || ep->ep.name == ep0name)
779 return -EINVAL;
780
781 local_irq_save(flags);
782
783 /* make sure it's actually queued on this endpoint */
784 list_for_each_entry (req, &ep->queue, queue) {
785 if (&req->req == _req)
786 break;
787 }
788 if (&req->req != _req) {
789 local_irq_restore(flags);
790 return -EINVAL;
791 }
792
793 done(ep, req, -ECONNRESET);
794
795 local_irq_restore(flags);
796 return 0;
797 }
798
799 /*-------------------------------------------------------------------------*/
800
801 static int pxa2xx_ep_set_halt(struct usb_ep *_ep, int value)
802 {
803 struct pxa2xx_ep *ep;
804 unsigned long flags;
805
806 ep = container_of(_ep, struct pxa2xx_ep, ep);
807 if (unlikely (!_ep
808 || (!ep->desc && ep->ep.name != ep0name))
809 || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
810 DMSG("%s, bad ep\n", __FUNCTION__);
811 return -EINVAL;
812 }
813 if (value == 0) {
814 /* this path (reset toggle+halt) is needed to implement
815 * SET_INTERFACE on normal hardware. but it can't be
816 * done from software on the PXA UDC, and the hardware
817 * forgets to do it as part of SET_INTERFACE automagic.
818 */
819 DMSG("only host can clear %s halt\n", _ep->name);
820 return -EROFS;
821 }
822
823 local_irq_save(flags);
824
825 if ((ep->bEndpointAddress & USB_DIR_IN) != 0
826 && ((*ep->reg_udccs & UDCCS_BI_TFS) == 0
827 || !list_empty(&ep->queue))) {
828 local_irq_restore(flags);
829 return -EAGAIN;
830 }
831
832 /* FST bit is the same for control, bulk in, bulk out, interrupt in */
833 *ep->reg_udccs = UDCCS_BI_FST|UDCCS_BI_FTF;
834
835 /* ep0 needs special care */
836 if (!ep->desc) {
837 start_watchdog(ep->dev);
838 ep->dev->req_pending = 0;
839 ep->dev->ep0state = EP0_STALL;
840
841 /* and bulk/intr endpoints like dropping stalls too */
842 } else {
843 unsigned i;
844 for (i = 0; i < 1000; i += 20) {
845 if (*ep->reg_udccs & UDCCS_BI_SST)
846 break;
847 udelay(20);
848 }
849 }
850 local_irq_restore(flags);
851
852 DBG(DBG_VERBOSE, "%s halt\n", _ep->name);
853 return 0;
854 }
855
856 static int pxa2xx_ep_fifo_status(struct usb_ep *_ep)
857 {
858 struct pxa2xx_ep *ep;
859
860 ep = container_of(_ep, struct pxa2xx_ep, ep);
861 if (!_ep) {
862 DMSG("%s, bad ep\n", __FUNCTION__);
863 return -ENODEV;
864 }
865 /* pxa can't report unclaimed bytes from IN fifos */
866 if ((ep->bEndpointAddress & USB_DIR_IN) != 0)
867 return -EOPNOTSUPP;
868 if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN
869 || (*ep->reg_udccs & UDCCS_BO_RFS) == 0)
870 return 0;
871 else
872 return (*ep->reg_ubcr & 0xfff) + 1;
873 }
874
875 static void pxa2xx_ep_fifo_flush(struct usb_ep *_ep)
876 {
877 struct pxa2xx_ep *ep;
878
879 ep = container_of(_ep, struct pxa2xx_ep, ep);
880 if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) {
881 DMSG("%s, bad ep\n", __FUNCTION__);
882 return;
883 }
884
885 /* toggle and halt bits stay unchanged */
886
887 /* for OUT, just read and discard the FIFO contents. */
888 if ((ep->bEndpointAddress & USB_DIR_IN) == 0) {
889 while (((*ep->reg_udccs) & UDCCS_BO_RNE) != 0)
890 (void) *ep->reg_uddr;
891 return;
892 }
893
894 /* most IN status is the same, but ISO can't stall */
895 *ep->reg_udccs = UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR
896 | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
897 ? 0 : UDCCS_BI_SST;
898 }
899
900
901 static struct usb_ep_ops pxa2xx_ep_ops = {
902 .enable = pxa2xx_ep_enable,
903 .disable = pxa2xx_ep_disable,
904
905 .alloc_request = pxa2xx_ep_alloc_request,
906 .free_request = pxa2xx_ep_free_request,
907
908 .queue = pxa2xx_ep_queue,
909 .dequeue = pxa2xx_ep_dequeue,
910
911 .set_halt = pxa2xx_ep_set_halt,
912 .fifo_status = pxa2xx_ep_fifo_status,
913 .fifo_flush = pxa2xx_ep_fifo_flush,
914 };
915
916
917 /* ---------------------------------------------------------------------------
918 * device-scoped parts of the api to the usb controller hardware
919 * ---------------------------------------------------------------------------
920 */
921
922 static int pxa2xx_udc_get_frame(struct usb_gadget *_gadget)
923 {
924 return ((UFNRH & 0x07) << 8) | (UFNRL & 0xff);
925 }
926
927 static int pxa2xx_udc_wakeup(struct usb_gadget *_gadget)
928 {
929 /* host may not have enabled remote wakeup */
930 if ((UDCCS0 & UDCCS0_DRWF) == 0)
931 return -EHOSTUNREACH;
932 udc_set_mask_UDCCR(UDCCR_RSM);
933 return 0;
934 }
935
936 static void stop_activity(struct pxa2xx_udc *, struct usb_gadget_driver *);
937 static void udc_enable (struct pxa2xx_udc *);
938 static void udc_disable(struct pxa2xx_udc *);
939
940 /* We disable the UDC -- and its 48 MHz clock -- whenever it's not
941 * in active use.
942 */
943 static int pullup(struct pxa2xx_udc *udc)
944 {
945 int is_active = udc->vbus && udc->pullup && !udc->suspended;
946 DMSG("%s\n", is_active ? "active" : "inactive");
947 if (is_active) {
948 if (!udc->active) {
949 udc->active = 1;
950 /* Enable clock for USB device */
951 clk_enable(udc->clk);
952 udc_enable(udc);
953 }
954 } else {
955 if (udc->active) {
956 if (udc->gadget.speed != USB_SPEED_UNKNOWN) {
957 DMSG("disconnect %s\n", udc->driver
958 ? udc->driver->driver.name
959 : "(no driver)");
960 stop_activity(udc, udc->driver);
961 }
962 udc_disable(udc);
963 /* Disable clock for USB device */
964 clk_disable(udc->clk);
965 udc->active = 0;
966 }
967
968 }
969 return 0;
970 }
971
972 /* VBUS reporting logically comes from a transceiver */
973 static int pxa2xx_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
974 {
975 struct pxa2xx_udc *udc;
976
977 udc = container_of(_gadget, struct pxa2xx_udc, gadget);
978 udc->vbus = (is_active != 0);
979 DMSG("vbus %s\n", is_active ? "supplied" : "inactive");
980 pullup(udc);
981 return 0;
982 }
983
984 /* drivers may have software control over D+ pullup */
985 static int pxa2xx_udc_pullup(struct usb_gadget *_gadget, int is_active)
986 {
987 struct pxa2xx_udc *udc;
988
989 udc = container_of(_gadget, struct pxa2xx_udc, gadget);
990
991 /* not all boards support pullup control */
992 if (!udc->mach->gpio_pullup && !udc->mach->udc_command)
993 return -EOPNOTSUPP;
994
995 udc->pullup = (is_active != 0);
996 pullup(udc);
997 return 0;
998 }
999
1000 static const struct usb_gadget_ops pxa2xx_udc_ops = {
1001 .get_frame = pxa2xx_udc_get_frame,
1002 .wakeup = pxa2xx_udc_wakeup,
1003 .vbus_session = pxa2xx_udc_vbus_session,
1004 .pullup = pxa2xx_udc_pullup,
1005
1006 // .vbus_draw ... boards may consume current from VBUS, up to
1007 // 100-500mA based on config. the 500uA suspend ceiling means
1008 // that exclusively vbus-powered PXA designs violate USB specs.
1009 };
1010
1011 /*-------------------------------------------------------------------------*/
1012
1013 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1014
1015 static int
1016 udc_seq_show(struct seq_file *m, void *_d)
1017 {
1018 struct pxa2xx_udc *dev = m->private;
1019 unsigned long flags;
1020 int i;
1021 u32 tmp;
1022
1023 local_irq_save(flags);
1024
1025 /* basic device status */
1026 seq_printf(m, DRIVER_DESC "\n"
1027 "%s version: %s\nGadget driver: %s\nHost %s\n\n",
1028 driver_name, DRIVER_VERSION SIZE_STR "(pio)",
1029 dev->driver ? dev->driver->driver.name : "(none)",
1030 is_vbus_present() ? "full speed" : "disconnected");
1031
1032 /* registers for device and ep0 */
1033 seq_printf(m,
1034 "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
1035 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
1036
1037 tmp = UDCCR;
1038 seq_printf(m,
1039 "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp,
1040 (tmp & UDCCR_REM) ? " rem" : "",
1041 (tmp & UDCCR_RSTIR) ? " rstir" : "",
1042 (tmp & UDCCR_SRM) ? " srm" : "",
1043 (tmp & UDCCR_SUSIR) ? " susir" : "",
1044 (tmp & UDCCR_RESIR) ? " resir" : "",
1045 (tmp & UDCCR_RSM) ? " rsm" : "",
1046 (tmp & UDCCR_UDA) ? " uda" : "",
1047 (tmp & UDCCR_UDE) ? " ude" : "");
1048
1049 tmp = UDCCS0;
1050 seq_printf(m,
1051 "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp,
1052 (tmp & UDCCS0_SA) ? " sa" : "",
1053 (tmp & UDCCS0_RNE) ? " rne" : "",
1054 (tmp & UDCCS0_FST) ? " fst" : "",
1055 (tmp & UDCCS0_SST) ? " sst" : "",
1056 (tmp & UDCCS0_DRWF) ? " dwrf" : "",
1057 (tmp & UDCCS0_FTF) ? " ftf" : "",
1058 (tmp & UDCCS0_IPR) ? " ipr" : "",
1059 (tmp & UDCCS0_OPR) ? " opr" : "");
1060
1061 if (dev->has_cfr) {
1062 tmp = UDCCFR;
1063 seq_printf(m,
1064 "udccfr %02X =%s%s\n", tmp,
1065 (tmp & UDCCFR_AREN) ? " aren" : "",
1066 (tmp & UDCCFR_ACM) ? " acm" : "");
1067 }
1068
1069 if (!is_vbus_present() || !dev->driver)
1070 goto done;
1071
1072 seq_printf(m, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
1073 dev->stats.write.bytes, dev->stats.write.ops,
1074 dev->stats.read.bytes, dev->stats.read.ops,
1075 dev->stats.irqs);
1076
1077 /* dump endpoint queues */
1078 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1079 struct pxa2xx_ep *ep = &dev->ep [i];
1080 struct pxa2xx_request *req;
1081
1082 if (i != 0) {
1083 const struct usb_endpoint_descriptor *desc;
1084
1085 desc = ep->desc;
1086 if (!desc)
1087 continue;
1088 tmp = *dev->ep [i].reg_udccs;
1089 seq_printf(m,
1090 "%s max %d %s udccs %02x irqs %lu\n",
1091 ep->ep.name, le16_to_cpu(desc->wMaxPacketSize),
1092 "pio", tmp, ep->pio_irqs);
1093 /* TODO translate all five groups of udccs bits! */
1094
1095 } else /* ep0 should only have one transfer queued */
1096 seq_printf(m, "ep0 max 16 pio irqs %lu\n",
1097 ep->pio_irqs);
1098
1099 if (list_empty(&ep->queue)) {
1100 seq_printf(m, "\t(nothing queued)\n");
1101 continue;
1102 }
1103 list_for_each_entry(req, &ep->queue, queue) {
1104 seq_printf(m,
1105 "\treq %p len %d/%d buf %p\n",
1106 &req->req, req->req.actual,
1107 req->req.length, req->req.buf);
1108 }
1109 }
1110
1111 done:
1112 local_irq_restore(flags);
1113 return 0;
1114 }
1115
1116 static int
1117 udc_debugfs_open(struct inode *inode, struct file *file)
1118 {
1119 return single_open(file, udc_seq_show, inode->i_private);
1120 }
1121
1122 static const struct file_operations debug_fops = {
1123 .open = udc_debugfs_open,
1124 .read = seq_read,
1125 .llseek = seq_lseek,
1126 .release = single_release,
1127 .owner = THIS_MODULE,
1128 };
1129
1130 #define create_debug_files(dev) \
1131 do { \
1132 dev->debugfs_udc = debugfs_create_file(dev->gadget.name, \
1133 S_IRUGO, NULL, dev, &debug_fops); \
1134 } while (0)
1135 #define remove_debug_files(dev) \
1136 do { \
1137 if (dev->debugfs_udc) \
1138 debugfs_remove(dev->debugfs_udc); \
1139 } while (0)
1140
1141 #else /* !CONFIG_USB_GADGET_DEBUG_FILES */
1142
1143 #define create_debug_files(dev) do {} while (0)
1144 #define remove_debug_files(dev) do {} while (0)
1145
1146 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
1147
1148 /*-------------------------------------------------------------------------*/
1149
1150 /*
1151 * udc_disable - disable USB device controller
1152 */
1153 static void udc_disable(struct pxa2xx_udc *dev)
1154 {
1155 /* block all irqs */
1156 udc_set_mask_UDCCR(UDCCR_SRM|UDCCR_REM);
1157 UICR0 = UICR1 = 0xff;
1158 UFNRH = UFNRH_SIM;
1159
1160 /* if hardware supports it, disconnect from usb */
1161 pullup_off();
1162
1163 udc_clear_mask_UDCCR(UDCCR_UDE);
1164
1165 ep0_idle (dev);
1166 dev->gadget.speed = USB_SPEED_UNKNOWN;
1167 }
1168
1169
1170 /*
1171 * udc_reinit - initialize software state
1172 */
1173 static void udc_reinit(struct pxa2xx_udc *dev)
1174 {
1175 u32 i;
1176
1177 /* device/ep0 records init */
1178 INIT_LIST_HEAD (&dev->gadget.ep_list);
1179 INIT_LIST_HEAD (&dev->gadget.ep0->ep_list);
1180 dev->ep0state = EP0_IDLE;
1181
1182 /* basic endpoint records init */
1183 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1184 struct pxa2xx_ep *ep = &dev->ep[i];
1185
1186 if (i != 0)
1187 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list);
1188
1189 ep->desc = NULL;
1190 ep->stopped = 0;
1191 INIT_LIST_HEAD (&ep->queue);
1192 ep->pio_irqs = 0;
1193 }
1194
1195 /* the rest was statically initialized, and is read-only */
1196 }
1197
1198 /* until it's enabled, this UDC should be completely invisible
1199 * to any USB host.
1200 */
1201 static void udc_enable (struct pxa2xx_udc *dev)
1202 {
1203 udc_clear_mask_UDCCR(UDCCR_UDE);
1204
1205 /* try to clear these bits before we enable the udc */
1206 udc_ack_int_UDCCR(UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR);
1207
1208 ep0_idle(dev);
1209 dev->gadget.speed = USB_SPEED_UNKNOWN;
1210 dev->stats.irqs = 0;
1211
1212 /*
1213 * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual:
1214 * - enable UDC
1215 * - if RESET is already in progress, ack interrupt
1216 * - unmask reset interrupt
1217 */
1218 udc_set_mask_UDCCR(UDCCR_UDE);
1219 if (!(UDCCR & UDCCR_UDA))
1220 udc_ack_int_UDCCR(UDCCR_RSTIR);
1221
1222 if (dev->has_cfr /* UDC_RES2 is defined */) {
1223 /* pxa255 (a0+) can avoid a set_config race that could
1224 * prevent gadget drivers from configuring correctly
1225 */
1226 UDCCFR = UDCCFR_ACM | UDCCFR_MB1;
1227 } else {
1228 /* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1)
1229 * which could result in missing packets and interrupts.
1230 * supposedly one bit per endpoint, controlling whether it
1231 * double buffers or not; ACM/AREN bits fit into the holes.
1232 * zero bits (like USIR0_IRx) disable double buffering.
1233 */
1234 UDC_RES1 = 0x00;
1235 UDC_RES2 = 0x00;
1236 }
1237
1238 /* enable suspend/resume and reset irqs */
1239 udc_clear_mask_UDCCR(UDCCR_SRM | UDCCR_REM);
1240
1241 /* enable ep0 irqs */
1242 UICR0 &= ~UICR0_IM0;
1243
1244 /* if hardware supports it, pullup D+ and wait for reset */
1245 pullup_on();
1246 }
1247
1248
1249 /* when a driver is successfully registered, it will receive
1250 * control requests including set_configuration(), which enables
1251 * non-control requests. then usb traffic follows until a
1252 * disconnect is reported. then a host may connect again, or
1253 * the driver might get unbound.
1254 */
1255 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1256 {
1257 struct pxa2xx_udc *dev = the_controller;
1258 int retval;
1259
1260 if (!driver
1261 || driver->speed < USB_SPEED_FULL
1262 || !driver->bind
1263 || !driver->disconnect
1264 || !driver->setup)
1265 return -EINVAL;
1266 if (!dev)
1267 return -ENODEV;
1268 if (dev->driver)
1269 return -EBUSY;
1270
1271 /* first hook up the driver ... */
1272 dev->driver = driver;
1273 dev->gadget.dev.driver = &driver->driver;
1274 dev->pullup = 1;
1275
1276 retval = device_add (&dev->gadget.dev);
1277 if (retval) {
1278 fail:
1279 dev->driver = NULL;
1280 dev->gadget.dev.driver = NULL;
1281 return retval;
1282 }
1283 retval = driver->bind(&dev->gadget);
1284 if (retval) {
1285 DMSG("bind to driver %s --> error %d\n",
1286 driver->driver.name, retval);
1287 device_del (&dev->gadget.dev);
1288 goto fail;
1289 }
1290
1291 /* ... then enable host detection and ep0; and we're ready
1292 * for set_configuration as well as eventual disconnect.
1293 */
1294 DMSG("registered gadget driver '%s'\n", driver->driver.name);
1295 pullup(dev);
1296 dump_state(dev);
1297 return 0;
1298 }
1299 EXPORT_SYMBOL(usb_gadget_register_driver);
1300
1301 static void
1302 stop_activity(struct pxa2xx_udc *dev, struct usb_gadget_driver *driver)
1303 {
1304 int i;
1305
1306 /* don't disconnect drivers more than once */
1307 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1308 driver = NULL;
1309 dev->gadget.speed = USB_SPEED_UNKNOWN;
1310
1311 /* prevent new request submissions, kill any outstanding requests */
1312 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
1313 struct pxa2xx_ep *ep = &dev->ep[i];
1314
1315 ep->stopped = 1;
1316 nuke(ep, -ESHUTDOWN);
1317 }
1318 del_timer_sync(&dev->timer);
1319
1320 /* report disconnect; the driver is already quiesced */
1321 if (driver)
1322 driver->disconnect(&dev->gadget);
1323
1324 /* re-init driver-visible data structures */
1325 udc_reinit(dev);
1326 }
1327
1328 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1329 {
1330 struct pxa2xx_udc *dev = the_controller;
1331
1332 if (!dev)
1333 return -ENODEV;
1334 if (!driver || driver != dev->driver || !driver->unbind)
1335 return -EINVAL;
1336
1337 local_irq_disable();
1338 dev->pullup = 0;
1339 pullup(dev);
1340 stop_activity(dev, driver);
1341 local_irq_enable();
1342
1343 driver->unbind(&dev->gadget);
1344 dev->gadget.dev.driver = NULL;
1345 dev->driver = NULL;
1346
1347 device_del (&dev->gadget.dev);
1348
1349 DMSG("unregistered gadget driver '%s'\n", driver->driver.name);
1350 dump_state(dev);
1351 return 0;
1352 }
1353 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1354
1355
1356 /*-------------------------------------------------------------------------*/
1357
1358 #ifdef CONFIG_ARCH_LUBBOCK
1359
1360 /* Lubbock has separate connect and disconnect irqs. More typical designs
1361 * use one GPIO as the VBUS IRQ, and another to control the D+ pullup.
1362 */
1363
1364 static irqreturn_t
1365 lubbock_vbus_irq(int irq, void *_dev)
1366 {
1367 struct pxa2xx_udc *dev = _dev;
1368 int vbus;
1369
1370 dev->stats.irqs++;
1371 switch (irq) {
1372 case LUBBOCK_USB_IRQ:
1373 vbus = 1;
1374 disable_irq(LUBBOCK_USB_IRQ);
1375 enable_irq(LUBBOCK_USB_DISC_IRQ);
1376 break;
1377 case LUBBOCK_USB_DISC_IRQ:
1378 vbus = 0;
1379 disable_irq(LUBBOCK_USB_DISC_IRQ);
1380 enable_irq(LUBBOCK_USB_IRQ);
1381 break;
1382 default:
1383 return IRQ_NONE;
1384 }
1385
1386 pxa2xx_udc_vbus_session(&dev->gadget, vbus);
1387 return IRQ_HANDLED;
1388 }
1389
1390 #endif
1391
1392 static irqreturn_t udc_vbus_irq(int irq, void *_dev)
1393 {
1394 struct pxa2xx_udc *dev = _dev;
1395 int vbus = gpio_get_value(dev->mach->gpio_vbus);
1396
1397 if (dev->mach->gpio_vbus_inverted)
1398 vbus = !vbus;
1399
1400 pxa2xx_udc_vbus_session(&dev->gadget, vbus);
1401 return IRQ_HANDLED;
1402 }
1403
1404
1405 /*-------------------------------------------------------------------------*/
1406
1407 static inline void clear_ep_state (struct pxa2xx_udc *dev)
1408 {
1409 unsigned i;
1410
1411 /* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint
1412 * fifos, and pending transactions mustn't be continued in any case.
1413 */
1414 for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++)
1415 nuke(&dev->ep[i], -ECONNABORTED);
1416 }
1417
1418 static void udc_watchdog(unsigned long _dev)
1419 {
1420 struct pxa2xx_udc *dev = (void *)_dev;
1421
1422 local_irq_disable();
1423 if (dev->ep0state == EP0_STALL
1424 && (UDCCS0 & UDCCS0_FST) == 0
1425 && (UDCCS0 & UDCCS0_SST) == 0) {
1426 UDCCS0 = UDCCS0_FST|UDCCS0_FTF;
1427 DBG(DBG_VERBOSE, "ep0 re-stall\n");
1428 start_watchdog(dev);
1429 }
1430 local_irq_enable();
1431 }
1432
1433 static void handle_ep0 (struct pxa2xx_udc *dev)
1434 {
1435 u32 udccs0 = UDCCS0;
1436 struct pxa2xx_ep *ep = &dev->ep [0];
1437 struct pxa2xx_request *req;
1438 union {
1439 struct usb_ctrlrequest r;
1440 u8 raw [8];
1441 u32 word [2];
1442 } u;
1443
1444 if (list_empty(&ep->queue))
1445 req = NULL;
1446 else
1447 req = list_entry(ep->queue.next, struct pxa2xx_request, queue);
1448
1449 /* clear stall status */
1450 if (udccs0 & UDCCS0_SST) {
1451 nuke(ep, -EPIPE);
1452 UDCCS0 = UDCCS0_SST;
1453 del_timer(&dev->timer);
1454 ep0_idle(dev);
1455 }
1456
1457 /* previous request unfinished? non-error iff back-to-back ... */
1458 if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) {
1459 nuke(ep, 0);
1460 del_timer(&dev->timer);
1461 ep0_idle(dev);
1462 }
1463
1464 switch (dev->ep0state) {
1465 case EP0_IDLE:
1466 /* late-breaking status? */
1467 udccs0 = UDCCS0;
1468
1469 /* start control request? */
1470 if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))
1471 == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) {
1472 int i;
1473
1474 nuke (ep, -EPROTO);
1475
1476 /* read SETUP packet */
1477 for (i = 0; i < 8; i++) {
1478 if (unlikely(!(UDCCS0 & UDCCS0_RNE))) {
1479 bad_setup:
1480 DMSG("SETUP %d!\n", i);
1481 goto stall;
1482 }
1483 u.raw [i] = (u8) UDDR0;
1484 }
1485 if (unlikely((UDCCS0 & UDCCS0_RNE) != 0))
1486 goto bad_setup;
1487
1488 got_setup:
1489 DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n",
1490 u.r.bRequestType, u.r.bRequest,
1491 le16_to_cpu(u.r.wValue),
1492 le16_to_cpu(u.r.wIndex),
1493 le16_to_cpu(u.r.wLength));
1494
1495 /* cope with automagic for some standard requests. */
1496 dev->req_std = (u.r.bRequestType & USB_TYPE_MASK)
1497 == USB_TYPE_STANDARD;
1498 dev->req_config = 0;
1499 dev->req_pending = 1;
1500 switch (u.r.bRequest) {
1501 /* hardware restricts gadget drivers here! */
1502 case USB_REQ_SET_CONFIGURATION:
1503 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1504 /* reflect hardware's automagic
1505 * up to the gadget driver.
1506 */
1507 config_change:
1508 dev->req_config = 1;
1509 clear_ep_state(dev);
1510 /* if !has_cfr, there's no synch
1511 * else use AREN (later) not SA|OPR
1512 * USIR0_IR0 acts edge sensitive
1513 */
1514 }
1515 break;
1516 /* ... and here, even more ... */
1517 case USB_REQ_SET_INTERFACE:
1518 if (u.r.bRequestType == USB_RECIP_INTERFACE) {
1519 /* udc hardware is broken by design:
1520 * - altsetting may only be zero;
1521 * - hw resets all interfaces' eps;
1522 * - ep reset doesn't include halt(?).
1523 */
1524 DMSG("broken set_interface (%d/%d)\n",
1525 le16_to_cpu(u.r.wIndex),
1526 le16_to_cpu(u.r.wValue));
1527 goto config_change;
1528 }
1529 break;
1530 /* hardware was supposed to hide this */
1531 case USB_REQ_SET_ADDRESS:
1532 if (u.r.bRequestType == USB_RECIP_DEVICE) {
1533 ep0start(dev, 0, "address");
1534 return;
1535 }
1536 break;
1537 }
1538
1539 if (u.r.bRequestType & USB_DIR_IN)
1540 dev->ep0state = EP0_IN_DATA_PHASE;
1541 else
1542 dev->ep0state = EP0_OUT_DATA_PHASE;
1543
1544 i = dev->driver->setup(&dev->gadget, &u.r);
1545 if (i < 0) {
1546 /* hardware automagic preventing STALL... */
1547 if (dev->req_config) {
1548 /* hardware sometimes neglects to tell
1549 * tell us about config change events,
1550 * so later ones may fail...
1551 */
1552 WARN("config change %02x fail %d?\n",
1553 u.r.bRequest, i);
1554 return;
1555 /* TODO experiment: if has_cfr,
1556 * hardware didn't ACK; maybe we
1557 * could actually STALL!
1558 */
1559 }
1560 DBG(DBG_VERBOSE, "protocol STALL, "
1561 "%02x err %d\n", UDCCS0, i);
1562 stall:
1563 /* the watchdog timer helps deal with cases
1564 * where udc seems to clear FST wrongly, and
1565 * then NAKs instead of STALLing.
1566 */
1567 ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall");
1568 start_watchdog(dev);
1569 dev->ep0state = EP0_STALL;
1570
1571 /* deferred i/o == no response yet */
1572 } else if (dev->req_pending) {
1573 if (likely(dev->ep0state == EP0_IN_DATA_PHASE
1574 || dev->req_std || u.r.wLength))
1575 ep0start(dev, 0, "defer");
1576 else
1577 ep0start(dev, UDCCS0_IPR, "defer/IPR");
1578 }
1579
1580 /* expect at least one data or status stage irq */
1581 return;
1582
1583 } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA))
1584 == (UDCCS0_OPR|UDCCS0_SA))) {
1585 unsigned i;
1586
1587 /* pxa210/250 erratum 131 for B0/B1 says RNE lies.
1588 * still observed on a pxa255 a0.
1589 */
1590 DBG(DBG_VERBOSE, "e131\n");
1591 nuke(ep, -EPROTO);
1592
1593 /* read SETUP data, but don't trust it too much */
1594 for (i = 0; i < 8; i++)
1595 u.raw [i] = (u8) UDDR0;
1596 if ((u.r.bRequestType & USB_RECIP_MASK)
1597 > USB_RECIP_OTHER)
1598 goto stall;
1599 if (u.word [0] == 0 && u.word [1] == 0)
1600 goto stall;
1601 goto got_setup;
1602 } else {
1603 /* some random early IRQ:
1604 * - we acked FST
1605 * - IPR cleared
1606 * - OPR got set, without SA (likely status stage)
1607 */
1608 UDCCS0 = udccs0 & (UDCCS0_SA|UDCCS0_OPR);
1609 }
1610 break;
1611 case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR etc */
1612 if (udccs0 & UDCCS0_OPR) {
1613 UDCCS0 = UDCCS0_OPR|UDCCS0_FTF;
1614 DBG(DBG_VERBOSE, "ep0in premature status\n");
1615 if (req)
1616 done(ep, req, 0);
1617 ep0_idle(dev);
1618 } else /* irq was IPR clearing */ {
1619 if (req) {
1620 /* this IN packet might finish the request */
1621 (void) write_ep0_fifo(ep, req);
1622 } /* else IN token before response was written */
1623 }
1624 break;
1625 case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR etc */
1626 if (udccs0 & UDCCS0_OPR) {
1627 if (req) {
1628 /* this OUT packet might finish the request */
1629 if (read_ep0_fifo(ep, req))
1630 done(ep, req, 0);
1631 /* else more OUT packets expected */
1632 } /* else OUT token before read was issued */
1633 } else /* irq was IPR clearing */ {
1634 DBG(DBG_VERBOSE, "ep0out premature status\n");
1635 if (req)
1636 done(ep, req, 0);
1637 ep0_idle(dev);
1638 }
1639 break;
1640 case EP0_END_XFER:
1641 if (req)
1642 done(ep, req, 0);
1643 /* ack control-IN status (maybe in-zlp was skipped)
1644 * also appears after some config change events.
1645 */
1646 if (udccs0 & UDCCS0_OPR)
1647 UDCCS0 = UDCCS0_OPR;
1648 ep0_idle(dev);
1649 break;
1650 case EP0_STALL:
1651 UDCCS0 = UDCCS0_FST;
1652 break;
1653 }
1654 USIR0 = USIR0_IR0;
1655 }
1656
1657 static void handle_ep(struct pxa2xx_ep *ep)
1658 {
1659 struct pxa2xx_request *req;
1660 int is_in = ep->bEndpointAddress & USB_DIR_IN;
1661 int completed;
1662 u32 udccs, tmp;
1663
1664 do {
1665 completed = 0;
1666 if (likely (!list_empty(&ep->queue)))
1667 req = list_entry(ep->queue.next,
1668 struct pxa2xx_request, queue);
1669 else
1670 req = NULL;
1671
1672 // TODO check FST handling
1673
1674 udccs = *ep->reg_udccs;
1675 if (unlikely(is_in)) { /* irq from TPC, SST, or (ISO) TUR */
1676 tmp = UDCCS_BI_TUR;
1677 if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1678 tmp |= UDCCS_BI_SST;
1679 tmp &= udccs;
1680 if (likely (tmp))
1681 *ep->reg_udccs = tmp;
1682 if (req && likely ((udccs & UDCCS_BI_TFS) != 0))
1683 completed = write_fifo(ep, req);
1684
1685 } else { /* irq from RPC (or for ISO, ROF) */
1686 if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK))
1687 tmp = UDCCS_BO_SST | UDCCS_BO_DME;
1688 else
1689 tmp = UDCCS_IO_ROF | UDCCS_IO_DME;
1690 tmp &= udccs;
1691 if (likely(tmp))
1692 *ep->reg_udccs = tmp;
1693
1694 /* fifos can hold packets, ready for reading... */
1695 if (likely(req)) {
1696 completed = read_fifo(ep, req);
1697 } else
1698 pio_irq_disable (ep->bEndpointAddress);
1699 }
1700 ep->pio_irqs++;
1701 } while (completed);
1702 }
1703
1704 /*
1705 * pxa2xx_udc_irq - interrupt handler
1706 *
1707 * avoid delays in ep0 processing. the control handshaking isn't always
1708 * under software control (pxa250c0 and the pxa255 are better), and delays
1709 * could cause usb protocol errors.
1710 */
1711 static irqreturn_t
1712 pxa2xx_udc_irq(int irq, void *_dev)
1713 {
1714 struct pxa2xx_udc *dev = _dev;
1715 int handled;
1716
1717 dev->stats.irqs++;
1718 do {
1719 u32 udccr = UDCCR;
1720
1721 handled = 0;
1722
1723 /* SUSpend Interrupt Request */
1724 if (unlikely(udccr & UDCCR_SUSIR)) {
1725 udc_ack_int_UDCCR(UDCCR_SUSIR);
1726 handled = 1;
1727 DBG(DBG_VERBOSE, "USB suspend%s\n", is_vbus_present()
1728 ? "" : "+disconnect");
1729
1730 if (!is_vbus_present())
1731 stop_activity(dev, dev->driver);
1732 else if (dev->gadget.speed != USB_SPEED_UNKNOWN
1733 && dev->driver
1734 && dev->driver->suspend)
1735 dev->driver->suspend(&dev->gadget);
1736 ep0_idle (dev);
1737 }
1738
1739 /* RESume Interrupt Request */
1740 if (unlikely(udccr & UDCCR_RESIR)) {
1741 udc_ack_int_UDCCR(UDCCR_RESIR);
1742 handled = 1;
1743 DBG(DBG_VERBOSE, "USB resume\n");
1744
1745 if (dev->gadget.speed != USB_SPEED_UNKNOWN
1746 && dev->driver
1747 && dev->driver->resume
1748 && is_vbus_present())
1749 dev->driver->resume(&dev->gadget);
1750 }
1751
1752 /* ReSeT Interrupt Request - USB reset */
1753 if (unlikely(udccr & UDCCR_RSTIR)) {
1754 udc_ack_int_UDCCR(UDCCR_RSTIR);
1755 handled = 1;
1756
1757 if ((UDCCR & UDCCR_UDA) == 0) {
1758 DBG(DBG_VERBOSE, "USB reset start\n");
1759
1760 /* reset driver and endpoints,
1761 * in case that's not yet done
1762 */
1763 stop_activity (dev, dev->driver);
1764
1765 } else {
1766 DBG(DBG_VERBOSE, "USB reset end\n");
1767 dev->gadget.speed = USB_SPEED_FULL;
1768 memset(&dev->stats, 0, sizeof dev->stats);
1769 /* driver and endpoints are still reset */
1770 }
1771
1772 } else {
1773 u32 usir0 = USIR0 & ~UICR0;
1774 u32 usir1 = USIR1 & ~UICR1;
1775 int i;
1776
1777 if (unlikely (!usir0 && !usir1))
1778 continue;
1779
1780 DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0);
1781
1782 /* control traffic */
1783 if (usir0 & USIR0_IR0) {
1784 dev->ep[0].pio_irqs++;
1785 handle_ep0(dev);
1786 handled = 1;
1787 }
1788
1789 /* endpoint data transfers */
1790 for (i = 0; i < 8; i++) {
1791 u32 tmp = 1 << i;
1792
1793 if (i && (usir0 & tmp)) {
1794 handle_ep(&dev->ep[i]);
1795 USIR0 |= tmp;
1796 handled = 1;
1797 }
1798 if (usir1 & tmp) {
1799 handle_ep(&dev->ep[i+8]);
1800 USIR1 |= tmp;
1801 handled = 1;
1802 }
1803 }
1804 }
1805
1806 /* we could also ask for 1 msec SOF (SIR) interrupts */
1807
1808 } while (handled);
1809 return IRQ_HANDLED;
1810 }
1811
1812 /*-------------------------------------------------------------------------*/
1813
1814 static void nop_release (struct device *dev)
1815 {
1816 DMSG("%s %s\n", __FUNCTION__, dev->bus_id);
1817 }
1818
1819 /* this uses load-time allocation and initialization (instead of
1820 * doing it at run-time) to save code, eliminate fault paths, and
1821 * be more obviously correct.
1822 */
1823 static struct pxa2xx_udc memory = {
1824 .gadget = {
1825 .ops = &pxa2xx_udc_ops,
1826 .ep0 = &memory.ep[0].ep,
1827 .name = driver_name,
1828 .dev = {
1829 .bus_id = "gadget",
1830 .release = nop_release,
1831 },
1832 },
1833
1834 /* control endpoint */
1835 .ep[0] = {
1836 .ep = {
1837 .name = ep0name,
1838 .ops = &pxa2xx_ep_ops,
1839 .maxpacket = EP0_FIFO_SIZE,
1840 },
1841 .dev = &memory,
1842 .reg_udccs = &UDCCS0,
1843 .reg_uddr = &UDDR0,
1844 },
1845
1846 /* first group of endpoints */
1847 .ep[1] = {
1848 .ep = {
1849 .name = "ep1in-bulk",
1850 .ops = &pxa2xx_ep_ops,
1851 .maxpacket = BULK_FIFO_SIZE,
1852 },
1853 .dev = &memory,
1854 .fifo_size = BULK_FIFO_SIZE,
1855 .bEndpointAddress = USB_DIR_IN | 1,
1856 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1857 .reg_udccs = &UDCCS1,
1858 .reg_uddr = &UDDR1,
1859 },
1860 .ep[2] = {
1861 .ep = {
1862 .name = "ep2out-bulk",
1863 .ops = &pxa2xx_ep_ops,
1864 .maxpacket = BULK_FIFO_SIZE,
1865 },
1866 .dev = &memory,
1867 .fifo_size = BULK_FIFO_SIZE,
1868 .bEndpointAddress = 2,
1869 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1870 .reg_udccs = &UDCCS2,
1871 .reg_ubcr = &UBCR2,
1872 .reg_uddr = &UDDR2,
1873 },
1874 #ifndef CONFIG_USB_PXA2XX_SMALL
1875 .ep[3] = {
1876 .ep = {
1877 .name = "ep3in-iso",
1878 .ops = &pxa2xx_ep_ops,
1879 .maxpacket = ISO_FIFO_SIZE,
1880 },
1881 .dev = &memory,
1882 .fifo_size = ISO_FIFO_SIZE,
1883 .bEndpointAddress = USB_DIR_IN | 3,
1884 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1885 .reg_udccs = &UDCCS3,
1886 .reg_uddr = &UDDR3,
1887 },
1888 .ep[4] = {
1889 .ep = {
1890 .name = "ep4out-iso",
1891 .ops = &pxa2xx_ep_ops,
1892 .maxpacket = ISO_FIFO_SIZE,
1893 },
1894 .dev = &memory,
1895 .fifo_size = ISO_FIFO_SIZE,
1896 .bEndpointAddress = 4,
1897 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1898 .reg_udccs = &UDCCS4,
1899 .reg_ubcr = &UBCR4,
1900 .reg_uddr = &UDDR4,
1901 },
1902 .ep[5] = {
1903 .ep = {
1904 .name = "ep5in-int",
1905 .ops = &pxa2xx_ep_ops,
1906 .maxpacket = INT_FIFO_SIZE,
1907 },
1908 .dev = &memory,
1909 .fifo_size = INT_FIFO_SIZE,
1910 .bEndpointAddress = USB_DIR_IN | 5,
1911 .bmAttributes = USB_ENDPOINT_XFER_INT,
1912 .reg_udccs = &UDCCS5,
1913 .reg_uddr = &UDDR5,
1914 },
1915
1916 /* second group of endpoints */
1917 .ep[6] = {
1918 .ep = {
1919 .name = "ep6in-bulk",
1920 .ops = &pxa2xx_ep_ops,
1921 .maxpacket = BULK_FIFO_SIZE,
1922 },
1923 .dev = &memory,
1924 .fifo_size = BULK_FIFO_SIZE,
1925 .bEndpointAddress = USB_DIR_IN | 6,
1926 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1927 .reg_udccs = &UDCCS6,
1928 .reg_uddr = &UDDR6,
1929 },
1930 .ep[7] = {
1931 .ep = {
1932 .name = "ep7out-bulk",
1933 .ops = &pxa2xx_ep_ops,
1934 .maxpacket = BULK_FIFO_SIZE,
1935 },
1936 .dev = &memory,
1937 .fifo_size = BULK_FIFO_SIZE,
1938 .bEndpointAddress = 7,
1939 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1940 .reg_udccs = &UDCCS7,
1941 .reg_ubcr = &UBCR7,
1942 .reg_uddr = &UDDR7,
1943 },
1944 .ep[8] = {
1945 .ep = {
1946 .name = "ep8in-iso",
1947 .ops = &pxa2xx_ep_ops,
1948 .maxpacket = ISO_FIFO_SIZE,
1949 },
1950 .dev = &memory,
1951 .fifo_size = ISO_FIFO_SIZE,
1952 .bEndpointAddress = USB_DIR_IN | 8,
1953 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1954 .reg_udccs = &UDCCS8,
1955 .reg_uddr = &UDDR8,
1956 },
1957 .ep[9] = {
1958 .ep = {
1959 .name = "ep9out-iso",
1960 .ops = &pxa2xx_ep_ops,
1961 .maxpacket = ISO_FIFO_SIZE,
1962 },
1963 .dev = &memory,
1964 .fifo_size = ISO_FIFO_SIZE,
1965 .bEndpointAddress = 9,
1966 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
1967 .reg_udccs = &UDCCS9,
1968 .reg_ubcr = &UBCR9,
1969 .reg_uddr = &UDDR9,
1970 },
1971 .ep[10] = {
1972 .ep = {
1973 .name = "ep10in-int",
1974 .ops = &pxa2xx_ep_ops,
1975 .maxpacket = INT_FIFO_SIZE,
1976 },
1977 .dev = &memory,
1978 .fifo_size = INT_FIFO_SIZE,
1979 .bEndpointAddress = USB_DIR_IN | 10,
1980 .bmAttributes = USB_ENDPOINT_XFER_INT,
1981 .reg_udccs = &UDCCS10,
1982 .reg_uddr = &UDDR10,
1983 },
1984
1985 /* third group of endpoints */
1986 .ep[11] = {
1987 .ep = {
1988 .name = "ep11in-bulk",
1989 .ops = &pxa2xx_ep_ops,
1990 .maxpacket = BULK_FIFO_SIZE,
1991 },
1992 .dev = &memory,
1993 .fifo_size = BULK_FIFO_SIZE,
1994 .bEndpointAddress = USB_DIR_IN | 11,
1995 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1996 .reg_udccs = &UDCCS11,
1997 .reg_uddr = &UDDR11,
1998 },
1999 .ep[12] = {
2000 .ep = {
2001 .name = "ep12out-bulk",
2002 .ops = &pxa2xx_ep_ops,
2003 .maxpacket = BULK_FIFO_SIZE,
2004 },
2005 .dev = &memory,
2006 .fifo_size = BULK_FIFO_SIZE,
2007 .bEndpointAddress = 12,
2008 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2009 .reg_udccs = &UDCCS12,
2010 .reg_ubcr = &UBCR12,
2011 .reg_uddr = &UDDR12,
2012 },
2013 .ep[13] = {
2014 .ep = {
2015 .name = "ep13in-iso",
2016 .ops = &pxa2xx_ep_ops,
2017 .maxpacket = ISO_FIFO_SIZE,
2018 },
2019 .dev = &memory,
2020 .fifo_size = ISO_FIFO_SIZE,
2021 .bEndpointAddress = USB_DIR_IN | 13,
2022 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
2023 .reg_udccs = &UDCCS13,
2024 .reg_uddr = &UDDR13,
2025 },
2026 .ep[14] = {
2027 .ep = {
2028 .name = "ep14out-iso",
2029 .ops = &pxa2xx_ep_ops,
2030 .maxpacket = ISO_FIFO_SIZE,
2031 },
2032 .dev = &memory,
2033 .fifo_size = ISO_FIFO_SIZE,
2034 .bEndpointAddress = 14,
2035 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
2036 .reg_udccs = &UDCCS14,
2037 .reg_ubcr = &UBCR14,
2038 .reg_uddr = &UDDR14,
2039 },
2040 .ep[15] = {
2041 .ep = {
2042 .name = "ep15in-int",
2043 .ops = &pxa2xx_ep_ops,
2044 .maxpacket = INT_FIFO_SIZE,
2045 },
2046 .dev = &memory,
2047 .fifo_size = INT_FIFO_SIZE,
2048 .bEndpointAddress = USB_DIR_IN | 15,
2049 .bmAttributes = USB_ENDPOINT_XFER_INT,
2050 .reg_udccs = &UDCCS15,
2051 .reg_uddr = &UDDR15,
2052 },
2053 #endif /* !CONFIG_USB_PXA2XX_SMALL */
2054 };
2055
2056 #define CP15R0_VENDOR_MASK 0xffffe000
2057
2058 #if defined(CONFIG_ARCH_PXA)
2059 #define CP15R0_XSCALE_VALUE 0x69052000 /* intel/arm/xscale */
2060
2061 #elif defined(CONFIG_ARCH_IXP4XX)
2062 #define CP15R0_XSCALE_VALUE 0x69054000 /* intel/arm/ixp4xx */
2063
2064 #endif
2065
2066 #define CP15R0_PROD_MASK 0x000003f0
2067 #define PXA25x 0x00000100 /* and PXA26x */
2068 #define PXA210 0x00000120
2069
2070 #define CP15R0_REV_MASK 0x0000000f
2071
2072 #define CP15R0_PRODREV_MASK (CP15R0_PROD_MASK | CP15R0_REV_MASK)
2073
2074 #define PXA255_A0 0x00000106 /* or PXA260_B1 */
2075 #define PXA250_C0 0x00000105 /* or PXA26x_B0 */
2076 #define PXA250_B2 0x00000104
2077 #define PXA250_B1 0x00000103 /* or PXA260_A0 */
2078 #define PXA250_B0 0x00000102
2079 #define PXA250_A1 0x00000101
2080 #define PXA250_A0 0x00000100
2081
2082 #define PXA210_C0 0x00000125
2083 #define PXA210_B2 0x00000124
2084 #define PXA210_B1 0x00000123
2085 #define PXA210_B0 0x00000122
2086 #define IXP425_A0 0x000001c1
2087 #define IXP425_B0 0x000001f1
2088 #define IXP465_AD 0x00000200
2089
2090 /*
2091 * probe - binds to the platform device
2092 */
2093 static int __init pxa2xx_udc_probe(struct platform_device *pdev)
2094 {
2095 struct pxa2xx_udc *dev = &memory;
2096 int retval, vbus_irq, irq;
2097 u32 chiprev;
2098
2099 /* insist on Intel/ARM/XScale */
2100 asm("mrc%? p15, 0, %0, c0, c0" : "=r" (chiprev));
2101 if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) {
2102 pr_err("%s: not XScale!\n", driver_name);
2103 return -ENODEV;
2104 }
2105
2106 /* trigger chiprev-specific logic */
2107 switch (chiprev & CP15R0_PRODREV_MASK) {
2108 #if defined(CONFIG_ARCH_PXA)
2109 case PXA255_A0:
2110 dev->has_cfr = 1;
2111 break;
2112 case PXA250_A0:
2113 case PXA250_A1:
2114 /* A0/A1 "not released"; ep 13, 15 unusable */
2115 /* fall through */
2116 case PXA250_B2: case PXA210_B2:
2117 case PXA250_B1: case PXA210_B1:
2118 case PXA250_B0: case PXA210_B0:
2119 /* OUT-DMA is broken ... */
2120 /* fall through */
2121 case PXA250_C0: case PXA210_C0:
2122 break;
2123 #elif defined(CONFIG_ARCH_IXP4XX)
2124 case IXP425_A0:
2125 case IXP425_B0:
2126 case IXP465_AD:
2127 dev->has_cfr = 1;
2128 break;
2129 #endif
2130 default:
2131 pr_err("%s: unrecognized processor: %08x\n",
2132 driver_name, chiprev);
2133 /* iop3xx, ixp4xx, ... */
2134 return -ENODEV;
2135 }
2136
2137 irq = platform_get_irq(pdev, 0);
2138 if (irq < 0)
2139 return -ENODEV;
2140
2141 dev->clk = clk_get(&pdev->dev, "UDCCLK");
2142 if (IS_ERR(dev->clk)) {
2143 retval = PTR_ERR(dev->clk);
2144 goto err_clk;
2145 }
2146
2147 pr_debug("%s: IRQ %d%s%s\n", driver_name, irq,
2148 dev->has_cfr ? "" : " (!cfr)",
2149 SIZE_STR "(pio)"
2150 );
2151
2152 /* other non-static parts of init */
2153 dev->dev = &pdev->dev;
2154 dev->mach = pdev->dev.platform_data;
2155
2156 if (dev->mach->gpio_vbus) {
2157 if ((retval = gpio_request(dev->mach->gpio_vbus,
2158 "pxa2xx_udc GPIO VBUS"))) {
2159 dev_dbg(&pdev->dev,
2160 "can't get vbus gpio %d, err: %d\n",
2161 dev->mach->gpio_vbus, retval);
2162 goto err_gpio_vbus;
2163 }
2164 gpio_direction_input(dev->mach->gpio_vbus);
2165 vbus_irq = gpio_to_irq(dev->mach->gpio_vbus);
2166 } else
2167 vbus_irq = 0;
2168
2169 if (dev->mach->gpio_pullup) {
2170 if ((retval = gpio_request(dev->mach->gpio_pullup,
2171 "pca2xx_udc GPIO PULLUP"))) {
2172 dev_dbg(&pdev->dev,
2173 "can't get pullup gpio %d, err: %d\n",
2174 dev->mach->gpio_pullup, retval);
2175 goto err_gpio_pullup;
2176 }
2177 gpio_direction_output(dev->mach->gpio_pullup, 0);
2178 }
2179
2180 init_timer(&dev->timer);
2181 dev->timer.function = udc_watchdog;
2182 dev->timer.data = (unsigned long) dev;
2183
2184 device_initialize(&dev->gadget.dev);
2185 dev->gadget.dev.parent = &pdev->dev;
2186 dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
2187
2188 the_controller = dev;
2189 platform_set_drvdata(pdev, dev);
2190
2191 udc_disable(dev);
2192 udc_reinit(dev);
2193
2194 dev->vbus = is_vbus_present();
2195
2196 /* irq setup after old hardware state is cleaned up */
2197 retval = request_irq(irq, pxa2xx_udc_irq,
2198 IRQF_DISABLED, driver_name, dev);
2199 if (retval != 0) {
2200 pr_err("%s: can't get irq %d, err %d\n",
2201 driver_name, irq, retval);
2202 goto err_irq1;
2203 }
2204 dev->got_irq = 1;
2205
2206 #ifdef CONFIG_ARCH_LUBBOCK
2207 if (machine_is_lubbock()) {
2208 retval = request_irq(LUBBOCK_USB_DISC_IRQ,
2209 lubbock_vbus_irq,
2210 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2211 driver_name, dev);
2212 if (retval != 0) {
2213 pr_err("%s: can't get irq %i, err %d\n",
2214 driver_name, LUBBOCK_USB_DISC_IRQ, retval);
2215 lubbock_fail0:
2216 goto err_irq_lub;
2217 }
2218 retval = request_irq(LUBBOCK_USB_IRQ,
2219 lubbock_vbus_irq,
2220 IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
2221 driver_name, dev);
2222 if (retval != 0) {
2223 pr_err("%s: can't get irq %i, err %d\n",
2224 driver_name, LUBBOCK_USB_IRQ, retval);
2225 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2226 goto lubbock_fail0;
2227 }
2228 } else
2229 #endif
2230 if (vbus_irq) {
2231 retval = request_irq(vbus_irq, udc_vbus_irq,
2232 IRQF_DISABLED | IRQF_SAMPLE_RANDOM |
2233 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
2234 driver_name, dev);
2235 if (retval != 0) {
2236 pr_err("%s: can't get irq %i, err %d\n",
2237 driver_name, vbus_irq, retval);
2238 goto err_vbus_irq;
2239 }
2240 }
2241 create_debug_files(dev);
2242
2243 return 0;
2244
2245 err_vbus_irq:
2246 #ifdef CONFIG_ARCH_LUBBOCK
2247 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2248 err_irq_lub:
2249 #endif
2250 free_irq(irq, dev);
2251 err_irq1:
2252 if (dev->mach->gpio_pullup)
2253 gpio_free(dev->mach->gpio_pullup);
2254 err_gpio_pullup:
2255 if (dev->mach->gpio_vbus)
2256 gpio_free(dev->mach->gpio_vbus);
2257 err_gpio_vbus:
2258 clk_put(dev->clk);
2259 err_clk:
2260 return retval;
2261 }
2262
2263 static void pxa2xx_udc_shutdown(struct platform_device *_dev)
2264 {
2265 pullup_off();
2266 }
2267
2268 static int __exit pxa2xx_udc_remove(struct platform_device *pdev)
2269 {
2270 struct pxa2xx_udc *dev = platform_get_drvdata(pdev);
2271
2272 if (dev->driver)
2273 return -EBUSY;
2274
2275 dev->pullup = 0;
2276 pullup(dev);
2277
2278 remove_debug_files(dev);
2279
2280 if (dev->got_irq) {
2281 free_irq(platform_get_irq(pdev, 0), dev);
2282 dev->got_irq = 0;
2283 }
2284 #ifdef CONFIG_ARCH_LUBBOCK
2285 if (machine_is_lubbock()) {
2286 free_irq(LUBBOCK_USB_DISC_IRQ, dev);
2287 free_irq(LUBBOCK_USB_IRQ, dev);
2288 }
2289 #endif
2290 if (dev->mach->gpio_vbus) {
2291 free_irq(gpio_to_irq(dev->mach->gpio_vbus), dev);
2292 gpio_free(dev->mach->gpio_vbus);
2293 }
2294 if (dev->mach->gpio_pullup)
2295 gpio_free(dev->mach->gpio_pullup);
2296
2297 clk_put(dev->clk);
2298
2299 platform_set_drvdata(pdev, NULL);
2300 the_controller = NULL;
2301 return 0;
2302 }
2303
2304 /*-------------------------------------------------------------------------*/
2305
2306 #ifdef CONFIG_PM
2307
2308 /* USB suspend (controlled by the host) and system suspend (controlled
2309 * by the PXA) don't necessarily work well together. If USB is active,
2310 * the 48 MHz clock is required; so the system can't enter 33 MHz idle
2311 * mode, or any deeper PM saving state.
2312 *
2313 * For now, we punt and forcibly disconnect from the USB host when PXA
2314 * enters any suspend state. While we're disconnected, we always disable
2315 * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states.
2316 * Boards without software pullup control shouldn't use those states.
2317 * VBUS IRQs should probably be ignored so that the PXA device just acts
2318 * "dead" to USB hosts until system resume.
2319 */
2320 static int pxa2xx_udc_suspend(struct platform_device *dev, pm_message_t state)
2321 {
2322 struct pxa2xx_udc *udc = platform_get_drvdata(dev);
2323 unsigned long flags;
2324
2325 if (!udc->mach->gpio_pullup && !udc->mach->udc_command)
2326 WARN("USB host won't detect disconnect!\n");
2327 udc->suspended = 1;
2328
2329 local_irq_save(flags);
2330 pullup(udc);
2331 local_irq_restore(flags);
2332
2333 return 0;
2334 }
2335
2336 static int pxa2xx_udc_resume(struct platform_device *dev)
2337 {
2338 struct pxa2xx_udc *udc = platform_get_drvdata(dev);
2339 unsigned long flags;
2340
2341 udc->suspended = 0;
2342 local_irq_save(flags);
2343 pullup(udc);
2344 local_irq_restore(flags);
2345
2346 return 0;
2347 }
2348
2349 #else
2350 #define pxa2xx_udc_suspend NULL
2351 #define pxa2xx_udc_resume NULL
2352 #endif
2353
2354 /*-------------------------------------------------------------------------*/
2355
2356 static struct platform_driver udc_driver = {
2357 .shutdown = pxa2xx_udc_shutdown,
2358 .remove = __exit_p(pxa2xx_udc_remove),
2359 .suspend = pxa2xx_udc_suspend,
2360 .resume = pxa2xx_udc_resume,
2361 .driver = {
2362 .owner = THIS_MODULE,
2363 .name = "pxa2xx-udc",
2364 },
2365 };
2366
2367 static int __init udc_init(void)
2368 {
2369 pr_info("%s: version %s\n", driver_name, DRIVER_VERSION);
2370 return platform_driver_probe(&udc_driver, pxa2xx_udc_probe);
2371 }
2372 module_init(udc_init);
2373
2374 static void __exit udc_exit(void)
2375 {
2376 platform_driver_unregister(&udc_driver);
2377 }
2378 module_exit(udc_exit);
2379
2380 MODULE_DESCRIPTION(DRIVER_DESC);
2381 MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell");
2382 MODULE_LICENSE("GPL");
2383 MODULE_ALIAS("platform:pxa2xx-udc");
Support for the Chinese Samsung S3C2440 based development boards