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i2c-eg20t: change timeout value 50msec to 1000msec
[zen-stable.git] / drivers / usb / gadget / at91_udc.c
blobb1f6e4380373b44385e7c57393919e654b5d5261
1 /*
2 * at91_udc -- driver for at91-series USB peripheral controller
3 *
4 * Copyright (C) 2004 by Thomas Rathbone
5 * Copyright (C) 2005 by HP Labs
6 * Copyright (C) 2005 by David Brownell
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #undef VERBOSE_DEBUG
15 #undef PACKET_TRACE
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/delay.h>
21 #include <linux/ioport.h>
22 #include <linux/slab.h>
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/list.h>
26 #include <linux/interrupt.h>
27 #include <linux/proc_fs.h>
28 #include <linux/prefetch.h>
29 #include <linux/clk.h>
30 #include <linux/usb/ch9.h>
31 #include <linux/usb/gadget.h>
32 #include <linux/prefetch.h>
33
34 #include <asm/byteorder.h>
35 #include <mach/hardware.h>
36 #include <asm/io.h>
37 #include <asm/irq.h>
38 #include <asm/system.h>
39 #include <asm/gpio.h>
40
41 #include <mach/board.h>
42 #include <mach/cpu.h>
43 #include <mach/at91sam9261_matrix.h>
44
45 #include "at91_udc.h"
46
47
48 /*
49 * This controller is simple and PIO-only. It's used in many AT91-series
50 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
51 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
52 *
53 * This driver expects the board has been wired with two GPIOs suppporting
54 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
55 * testing hasn't covered such cases.)
56 *
57 * The pullup is most important (so it's integrated on sam926x parts). It
58 * provides software control over whether the host enumerates the device.
59 *
60 * The VBUS sensing helps during enumeration, and allows both USB clocks
61 * (and the transceiver) to stay gated off until they're necessary, saving
62 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
63 * it may also be gated off by software during some Linux sleep states.
64 */
65
66 #define DRIVER_VERSION "3 May 2006"
67
68 static const char driver_name [] = "at91_udc";
69 static const char ep0name[] = "ep0";
70
71 #define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
72
73 #define at91_udp_read(udc, reg) \
74 __raw_readl((udc)->udp_baseaddr + (reg))
75 #define at91_udp_write(udc, reg, val) \
76 __raw_writel((val), (udc)->udp_baseaddr + (reg))
77
78 /*-------------------------------------------------------------------------*/
79
80 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
81
82 #include <linux/seq_file.h>
83
84 static const char debug_filename[] = "driver/udc";
85
86 #define FOURBITS "%s%s%s%s"
87 #define EIGHTBITS FOURBITS FOURBITS
88
89 static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
90 {
91 static char *types[] = {
92 "control", "out-iso", "out-bulk", "out-int",
93 "BOGUS", "in-iso", "in-bulk", "in-int"};
94
95 u32 csr;
96 struct at91_request *req;
97 unsigned long flags;
98 struct at91_udc *udc = ep->udc;
99
100 spin_lock_irqsave(&udc->lock, flags);
101
102 csr = __raw_readl(ep->creg);
103
104 /* NOTE: not collecting per-endpoint irq statistics... */
105
106 seq_printf(s, "\n");
107 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
108 ep->ep.name, ep->ep.maxpacket,
109 ep->is_in ? "in" : "out",
110 ep->is_iso ? " iso" : "",
111 ep->is_pingpong
112 ? (ep->fifo_bank ? "pong" : "ping")
113 : "",
114 ep->stopped ? " stopped" : "");
115 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
116 csr,
117 (csr & 0x07ff0000) >> 16,
118 (csr & (1 << 15)) ? "enabled" : "disabled",
119 (csr & (1 << 11)) ? "DATA1" : "DATA0",
120 types[(csr & 0x700) >> 8],
121
122 /* iff type is control then print current direction */
123 (!(csr & 0x700))
124 ? ((csr & (1 << 7)) ? " IN" : " OUT")
125 : "",
126 (csr & (1 << 6)) ? " rxdatabk1" : "",
127 (csr & (1 << 5)) ? " forcestall" : "",
128 (csr & (1 << 4)) ? " txpktrdy" : "",
129
130 (csr & (1 << 3)) ? " stallsent" : "",
131 (csr & (1 << 2)) ? " rxsetup" : "",
132 (csr & (1 << 1)) ? " rxdatabk0" : "",
133 (csr & (1 << 0)) ? " txcomp" : "");
134 if (list_empty (&ep->queue))
135 seq_printf(s, "\t(queue empty)\n");
136
137 else list_for_each_entry (req, &ep->queue, queue) {
138 unsigned length = req->req.actual;
139
140 seq_printf(s, "\treq %p len %d/%d buf %p\n",
141 &req->req, length,
142 req->req.length, req->req.buf);
143 }
144 spin_unlock_irqrestore(&udc->lock, flags);
145 }
146
147 static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
148 {
149 int i;
150
151 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
152 (mask & (1 << 13)) ? " wakeup" : "",
153 (mask & (1 << 12)) ? " endbusres" : "",
154
155 (mask & (1 << 11)) ? " sofint" : "",
156 (mask & (1 << 10)) ? " extrsm" : "",
157 (mask & (1 << 9)) ? " rxrsm" : "",
158 (mask & (1 << 8)) ? " rxsusp" : "");
159 for (i = 0; i < 8; i++) {
160 if (mask & (1 << i))
161 seq_printf(s, " ep%d", i);
162 }
163 seq_printf(s, "\n");
164 }
165
166 static int proc_udc_show(struct seq_file *s, void *unused)
167 {
168 struct at91_udc *udc = s->private;
169 struct at91_ep *ep;
170 u32 tmp;
171
172 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
173
174 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
175 udc->vbus ? "present" : "off",
176 udc->enabled
177 ? (udc->vbus ? "active" : "enabled")
178 : "disabled",
179 udc->selfpowered ? "self" : "VBUS",
180 udc->suspended ? ", suspended" : "",
181 udc->driver ? udc->driver->driver.name : "(none)");
182
183 /* don't access registers when interface isn't clocked */
184 if (!udc->clocked) {
185 seq_printf(s, "(not clocked)\n");
186 return 0;
187 }
188
189 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
190 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
191 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
192 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
193 (tmp & AT91_UDP_NUM));
194
195 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
196 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
197 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
198 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
199 (tmp & AT91_UDP_ESR) ? " esr" : "",
200 (tmp & AT91_UDP_CONFG) ? " confg" : "",
201 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
202
203 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
204 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
205 (tmp & AT91_UDP_FEN) ? " fen" : "",
206 (tmp & AT91_UDP_FADD));
207
208 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
209 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
210
211 if (udc->enabled && udc->vbus) {
212 proc_ep_show(s, &udc->ep[0]);
213 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
214 if (ep->desc)
215 proc_ep_show(s, ep);
216 }
217 }
218 return 0;
219 }
220
221 static int proc_udc_open(struct inode *inode, struct file *file)
222 {
223 return single_open(file, proc_udc_show, PDE(inode)->data);
224 }
225
226 static const struct file_operations proc_ops = {
227 .owner = THIS_MODULE,
228 .open = proc_udc_open,
229 .read = seq_read,
230 .llseek = seq_lseek,
231 .release = single_release,
232 };
233
234 static void create_debug_file(struct at91_udc *udc)
235 {
236 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
237 }
238
239 static void remove_debug_file(struct at91_udc *udc)
240 {
241 if (udc->pde)
242 remove_proc_entry(debug_filename, NULL);
243 }
244
245 #else
246
247 static inline void create_debug_file(struct at91_udc *udc) {}
248 static inline void remove_debug_file(struct at91_udc *udc) {}
249
250 #endif
251
252
253 /*-------------------------------------------------------------------------*/
254
255 static void done(struct at91_ep *ep, struct at91_request *req, int status)
256 {
257 unsigned stopped = ep->stopped;
258 struct at91_udc *udc = ep->udc;
259
260 list_del_init(&req->queue);
261 if (req->req.status == -EINPROGRESS)
262 req->req.status = status;
263 else
264 status = req->req.status;
265 if (status && status != -ESHUTDOWN)
266 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
267
268 ep->stopped = 1;
269 spin_unlock(&udc->lock);
270 req->req.complete(&ep->ep, &req->req);
271 spin_lock(&udc->lock);
272 ep->stopped = stopped;
273
274 /* ep0 is always ready; other endpoints need a non-empty queue */
275 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
276 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
277 }
278
279 /*-------------------------------------------------------------------------*/
280
281 /* bits indicating OUT fifo has data ready */
282 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
283
284 /*
285 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
286 * back most of the value you just read (because of side effects, including
287 * bits that may change after reading and before writing).
288 *
289 * Except when changing a specific bit, always write values which:
290 * - clear SET_FX bits (setting them could change something)
291 * - set CLR_FX bits (clearing them could change something)
292 *
293 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
294 * that shouldn't normally be changed.
295 *
296 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
297 * implying a need to wait for one write to complete (test relevant bits)
298 * before starting the next write. This shouldn't be an issue given how
299 * infrequently we write, except maybe for write-then-read idioms.
300 */
301 #define SET_FX (AT91_UDP_TXPKTRDY)
302 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
303 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
304
305 /* pull OUT packet data from the endpoint's fifo */
306 static int read_fifo (struct at91_ep *ep, struct at91_request *req)
307 {
308 u32 __iomem *creg = ep->creg;
309 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
310 u32 csr;
311 u8 *buf;
312 unsigned int count, bufferspace, is_done;
313
314 buf = req->req.buf + req->req.actual;
315 bufferspace = req->req.length - req->req.actual;
316
317 /*
318 * there might be nothing to read if ep_queue() calls us,
319 * or if we already emptied both pingpong buffers
320 */
321 rescan:
322 csr = __raw_readl(creg);
323 if ((csr & RX_DATA_READY) == 0)
324 return 0;
325
326 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
327 if (count > ep->ep.maxpacket)
328 count = ep->ep.maxpacket;
329 if (count > bufferspace) {
330 DBG("%s buffer overflow\n", ep->ep.name);
331 req->req.status = -EOVERFLOW;
332 count = bufferspace;
333 }
334 __raw_readsb(dreg, buf, count);
335
336 /* release and swap pingpong mem bank */
337 csr |= CLR_FX;
338 if (ep->is_pingpong) {
339 if (ep->fifo_bank == 0) {
340 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
341 ep->fifo_bank = 1;
342 } else {
343 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
344 ep->fifo_bank = 0;
345 }
346 } else
347 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
348 __raw_writel(csr, creg);
349
350 req->req.actual += count;
351 is_done = (count < ep->ep.maxpacket);
352 if (count == bufferspace)
353 is_done = 1;
354
355 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
356 is_done ? " (done)" : "");
357
358 /*
359 * avoid extra trips through IRQ logic for packets already in
360 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
361 */
362 if (is_done)
363 done(ep, req, 0);
364 else if (ep->is_pingpong) {
365 /*
366 * One dummy read to delay the code because of a HW glitch:
367 * CSR returns bad RXCOUNT when read too soon after updating
368 * RX_DATA_BK flags.
369 */
370 csr = __raw_readl(creg);
371
372 bufferspace -= count;
373 buf += count;
374 goto rescan;
375 }
376
377 return is_done;
378 }
379
380 /* load fifo for an IN packet */
381 static int write_fifo(struct at91_ep *ep, struct at91_request *req)
382 {
383 u32 __iomem *creg = ep->creg;
384 u32 csr = __raw_readl(creg);
385 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
386 unsigned total, count, is_last;
387 u8 *buf;
388
389 /*
390 * TODO: allow for writing two packets to the fifo ... that'll
391 * reduce the amount of IN-NAKing, but probably won't affect
392 * throughput much. (Unlike preventing OUT-NAKing!)
393 */
394
395 /*
396 * If ep_queue() calls us, the queue is empty and possibly in
397 * odd states like TXCOMP not yet cleared (we do it, saving at
398 * least one IRQ) or the fifo not yet being free. Those aren't
399 * issues normally (IRQ handler fast path).
400 */
401 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
402 if (csr & AT91_UDP_TXCOMP) {
403 csr |= CLR_FX;
404 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
405 __raw_writel(csr, creg);
406 csr = __raw_readl(creg);
407 }
408 if (csr & AT91_UDP_TXPKTRDY)
409 return 0;
410 }
411
412 buf = req->req.buf + req->req.actual;
413 prefetch(buf);
414 total = req->req.length - req->req.actual;
415 if (ep->ep.maxpacket < total) {
416 count = ep->ep.maxpacket;
417 is_last = 0;
418 } else {
419 count = total;
420 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
421 }
422
423 /*
424 * Write the packet, maybe it's a ZLP.
425 *
426 * NOTE: incrementing req->actual before we receive the ACK means
427 * gadget driver IN bytecounts can be wrong in fault cases. That's
428 * fixable with PIO drivers like this one (save "count" here, and
429 * do the increment later on TX irq), but not for most DMA hardware.
430 *
431 * So all gadget drivers must accept that potential error. Some
432 * hardware supports precise fifo status reporting, letting them
433 * recover when the actual bytecount matters (e.g. for USB Test
434 * and Measurement Class devices).
435 */
436 __raw_writesb(dreg, buf, count);
437 csr &= ~SET_FX;
438 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
439 __raw_writel(csr, creg);
440 req->req.actual += count;
441
442 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
443 is_last ? " (done)" : "");
444 if (is_last)
445 done(ep, req, 0);
446 return is_last;
447 }
448
449 static void nuke(struct at91_ep *ep, int status)
450 {
451 struct at91_request *req;
452
453 /* terminate any request in the queue */
454 ep->stopped = 1;
455 if (list_empty(&ep->queue))
456 return;
457
458 VDBG("%s %s\n", __func__, ep->ep.name);
459 while (!list_empty(&ep->queue)) {
460 req = list_entry(ep->queue.next, struct at91_request, queue);
461 done(ep, req, status);
462 }
463 }
464
465 /*-------------------------------------------------------------------------*/
466
467 static int at91_ep_enable(struct usb_ep *_ep,
468 const struct usb_endpoint_descriptor *desc)
469 {
470 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
471 struct at91_udc *udc = ep->udc;
472 u16 maxpacket;
473 u32 tmp;
474 unsigned long flags;
475
476 if (!_ep || !ep
477 || !desc || ep->desc
478 || _ep->name == ep0name
479 || desc->bDescriptorType != USB_DT_ENDPOINT
480 || (maxpacket = usb_endpoint_maxp(desc)) == 0
481 || maxpacket > ep->maxpacket) {
482 DBG("bad ep or descriptor\n");
483 return -EINVAL;
484 }
485
486 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
487 DBG("bogus device state\n");
488 return -ESHUTDOWN;
489 }
490
491 tmp = usb_endpoint_type(desc);
492 switch (tmp) {
493 case USB_ENDPOINT_XFER_CONTROL:
494 DBG("only one control endpoint\n");
495 return -EINVAL;
496 case USB_ENDPOINT_XFER_INT:
497 if (maxpacket > 64)
498 goto bogus_max;
499 break;
500 case USB_ENDPOINT_XFER_BULK:
501 switch (maxpacket) {
502 case 8:
503 case 16:
504 case 32:
505 case 64:
506 goto ok;
507 }
508 bogus_max:
509 DBG("bogus maxpacket %d\n", maxpacket);
510 return -EINVAL;
511 case USB_ENDPOINT_XFER_ISOC:
512 if (!ep->is_pingpong) {
513 DBG("iso requires double buffering\n");
514 return -EINVAL;
515 }
516 break;
517 }
518
519 ok:
520 spin_lock_irqsave(&udc->lock, flags);
521
522 /* initialize endpoint to match this descriptor */
523 ep->is_in = usb_endpoint_dir_in(desc);
524 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
525 ep->stopped = 0;
526 if (ep->is_in)
527 tmp |= 0x04;
528 tmp <<= 8;
529 tmp |= AT91_UDP_EPEDS;
530 __raw_writel(tmp, ep->creg);
531
532 ep->desc = desc;
533 ep->ep.maxpacket = maxpacket;
534
535 /*
536 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
537 * since endpoint resets don't reset hw pingpong state.
538 */
539 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
540 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
541
542 spin_unlock_irqrestore(&udc->lock, flags);
543 return 0;
544 }
545
546 static int at91_ep_disable (struct usb_ep * _ep)
547 {
548 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
549 struct at91_udc *udc = ep->udc;
550 unsigned long flags;
551
552 if (ep == &ep->udc->ep[0])
553 return -EINVAL;
554
555 spin_lock_irqsave(&udc->lock, flags);
556
557 nuke(ep, -ESHUTDOWN);
558
559 /* restore the endpoint's pristine config */
560 ep->desc = NULL;
561 ep->ep.desc = NULL;
562 ep->ep.maxpacket = ep->maxpacket;
563
564 /* reset fifos and endpoint */
565 if (ep->udc->clocked) {
566 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
567 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
568 __raw_writel(0, ep->creg);
569 }
570
571 spin_unlock_irqrestore(&udc->lock, flags);
572 return 0;
573 }
574
575 /*
576 * this is a PIO-only driver, so there's nothing
577 * interesting for request or buffer allocation.
578 */
579
580 static struct usb_request *
581 at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
582 {
583 struct at91_request *req;
584
585 req = kzalloc(sizeof (struct at91_request), gfp_flags);
586 if (!req)
587 return NULL;
588
589 INIT_LIST_HEAD(&req->queue);
590 return &req->req;
591 }
592
593 static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
594 {
595 struct at91_request *req;
596
597 req = container_of(_req, struct at91_request, req);
598 BUG_ON(!list_empty(&req->queue));
599 kfree(req);
600 }
601
602 static int at91_ep_queue(struct usb_ep *_ep,
603 struct usb_request *_req, gfp_t gfp_flags)
604 {
605 struct at91_request *req;
606 struct at91_ep *ep;
607 struct at91_udc *udc;
608 int status;
609 unsigned long flags;
610
611 req = container_of(_req, struct at91_request, req);
612 ep = container_of(_ep, struct at91_ep, ep);
613
614 if (!_req || !_req->complete
615 || !_req->buf || !list_empty(&req->queue)) {
616 DBG("invalid request\n");
617 return -EINVAL;
618 }
619
620 if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
621 DBG("invalid ep\n");
622 return -EINVAL;
623 }
624
625 udc = ep->udc;
626
627 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
628 DBG("invalid device\n");
629 return -EINVAL;
630 }
631
632 _req->status = -EINPROGRESS;
633 _req->actual = 0;
634
635 spin_lock_irqsave(&udc->lock, flags);
636
637 /* try to kickstart any empty and idle queue */
638 if (list_empty(&ep->queue) && !ep->stopped) {
639 int is_ep0;
640
641 /*
642 * If this control request has a non-empty DATA stage, this
643 * will start that stage. It works just like a non-control
644 * request (until the status stage starts, maybe early).
645 *
646 * If the data stage is empty, then this starts a successful
647 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
648 */
649 is_ep0 = (ep->ep.name == ep0name);
650 if (is_ep0) {
651 u32 tmp;
652
653 if (!udc->req_pending) {
654 status = -EINVAL;
655 goto done;
656 }
657
658 /*
659 * defer changing CONFG until after the gadget driver
660 * reconfigures the endpoints.
661 */
662 if (udc->wait_for_config_ack) {
663 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
664 tmp ^= AT91_UDP_CONFG;
665 VDBG("toggle config\n");
666 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
667 }
668 if (req->req.length == 0) {
669 ep0_in_status:
670 PACKET("ep0 in/status\n");
671 status = 0;
672 tmp = __raw_readl(ep->creg);
673 tmp &= ~SET_FX;
674 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
675 __raw_writel(tmp, ep->creg);
676 udc->req_pending = 0;
677 goto done;
678 }
679 }
680
681 if (ep->is_in)
682 status = write_fifo(ep, req);
683 else {
684 status = read_fifo(ep, req);
685
686 /* IN/STATUS stage is otherwise triggered by irq */
687 if (status && is_ep0)
688 goto ep0_in_status;
689 }
690 } else
691 status = 0;
692
693 if (req && !status) {
694 list_add_tail (&req->queue, &ep->queue);
695 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
696 }
697 done:
698 spin_unlock_irqrestore(&udc->lock, flags);
699 return (status < 0) ? status : 0;
700 }
701
702 static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
703 {
704 struct at91_ep *ep;
705 struct at91_request *req;
706 unsigned long flags;
707 struct at91_udc *udc;
708
709 ep = container_of(_ep, struct at91_ep, ep);
710 if (!_ep || ep->ep.name == ep0name)
711 return -EINVAL;
712
713 udc = ep->udc;
714
715 spin_lock_irqsave(&udc->lock, flags);
716
717 /* make sure it's actually queued on this endpoint */
718 list_for_each_entry (req, &ep->queue, queue) {
719 if (&req->req == _req)
720 break;
721 }
722 if (&req->req != _req) {
723 spin_unlock_irqrestore(&udc->lock, flags);
724 return -EINVAL;
725 }
726
727 done(ep, req, -ECONNRESET);
728 spin_unlock_irqrestore(&udc->lock, flags);
729 return 0;
730 }
731
732 static int at91_ep_set_halt(struct usb_ep *_ep, int value)
733 {
734 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
735 struct at91_udc *udc = ep->udc;
736 u32 __iomem *creg;
737 u32 csr;
738 unsigned long flags;
739 int status = 0;
740
741 if (!_ep || ep->is_iso || !ep->udc->clocked)
742 return -EINVAL;
743
744 creg = ep->creg;
745 spin_lock_irqsave(&udc->lock, flags);
746
747 csr = __raw_readl(creg);
748
749 /*
750 * fail with still-busy IN endpoints, ensuring correct sequencing
751 * of data tx then stall. note that the fifo rx bytecount isn't
752 * completely accurate as a tx bytecount.
753 */
754 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
755 status = -EAGAIN;
756 else {
757 csr |= CLR_FX;
758 csr &= ~SET_FX;
759 if (value) {
760 csr |= AT91_UDP_FORCESTALL;
761 VDBG("halt %s\n", ep->ep.name);
762 } else {
763 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
764 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
765 csr &= ~AT91_UDP_FORCESTALL;
766 }
767 __raw_writel(csr, creg);
768 }
769
770 spin_unlock_irqrestore(&udc->lock, flags);
771 return status;
772 }
773
774 static const struct usb_ep_ops at91_ep_ops = {
775 .enable = at91_ep_enable,
776 .disable = at91_ep_disable,
777 .alloc_request = at91_ep_alloc_request,
778 .free_request = at91_ep_free_request,
779 .queue = at91_ep_queue,
780 .dequeue = at91_ep_dequeue,
781 .set_halt = at91_ep_set_halt,
782 /* there's only imprecise fifo status reporting */
783 };
784
785 /*-------------------------------------------------------------------------*/
786
787 static int at91_get_frame(struct usb_gadget *gadget)
788 {
789 struct at91_udc *udc = to_udc(gadget);
790
791 if (!to_udc(gadget)->clocked)
792 return -EINVAL;
793 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
794 }
795
796 static int at91_wakeup(struct usb_gadget *gadget)
797 {
798 struct at91_udc *udc = to_udc(gadget);
799 u32 glbstate;
800 int status = -EINVAL;
801 unsigned long flags;
802
803 DBG("%s\n", __func__ );
804 spin_lock_irqsave(&udc->lock, flags);
805
806 if (!udc->clocked || !udc->suspended)
807 goto done;
808
809 /* NOTE: some "early versions" handle ESR differently ... */
810
811 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
812 if (!(glbstate & AT91_UDP_ESR))
813 goto done;
814 glbstate |= AT91_UDP_ESR;
815 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
816
817 done:
818 spin_unlock_irqrestore(&udc->lock, flags);
819 return status;
820 }
821
822 /* reinit == restore initial software state */
823 static void udc_reinit(struct at91_udc *udc)
824 {
825 u32 i;
826
827 INIT_LIST_HEAD(&udc->gadget.ep_list);
828 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
829
830 for (i = 0; i < NUM_ENDPOINTS; i++) {
831 struct at91_ep *ep = &udc->ep[i];
832
833 if (i != 0)
834 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
835 ep->desc = NULL;
836 ep->stopped = 0;
837 ep->fifo_bank = 0;
838 ep->ep.maxpacket = ep->maxpacket;
839 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
840 /* initialize one queue per endpoint */
841 INIT_LIST_HEAD(&ep->queue);
842 }
843 }
844
845 static void stop_activity(struct at91_udc *udc)
846 {
847 struct usb_gadget_driver *driver = udc->driver;
848 int i;
849
850 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
851 driver = NULL;
852 udc->gadget.speed = USB_SPEED_UNKNOWN;
853 udc->suspended = 0;
854
855 for (i = 0; i < NUM_ENDPOINTS; i++) {
856 struct at91_ep *ep = &udc->ep[i];
857 ep->stopped = 1;
858 nuke(ep, -ESHUTDOWN);
859 }
860 if (driver) {
861 spin_unlock(&udc->lock);
862 driver->disconnect(&udc->gadget);
863 spin_lock(&udc->lock);
864 }
865
866 udc_reinit(udc);
867 }
868
869 static void clk_on(struct at91_udc *udc)
870 {
871 if (udc->clocked)
872 return;
873 udc->clocked = 1;
874 clk_enable(udc->iclk);
875 clk_enable(udc->fclk);
876 }
877
878 static void clk_off(struct at91_udc *udc)
879 {
880 if (!udc->clocked)
881 return;
882 udc->clocked = 0;
883 udc->gadget.speed = USB_SPEED_UNKNOWN;
884 clk_disable(udc->fclk);
885 clk_disable(udc->iclk);
886 }
887
888 /*
889 * activate/deactivate link with host; minimize power usage for
890 * inactive links by cutting clocks and transceiver power.
891 */
892 static void pullup(struct at91_udc *udc, int is_on)
893 {
894 int active = !udc->board.pullup_active_low;
895
896 if (!udc->enabled || !udc->vbus)
897 is_on = 0;
898 DBG("%sactive\n", is_on ? "" : "in");
899
900 if (is_on) {
901 clk_on(udc);
902 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
903 at91_udp_write(udc, AT91_UDP_TXVC, 0);
904 if (cpu_is_at91rm9200())
905 gpio_set_value(udc->board.pullup_pin, active);
906 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
907 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
908
909 txvc |= AT91_UDP_TXVC_PUON;
910 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
911 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
912 u32 usbpucr;
913
914 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
915 usbpucr |= AT91_MATRIX_USBPUCR_PUON;
916 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
917 }
918 } else {
919 stop_activity(udc);
920 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
921 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
922 if (cpu_is_at91rm9200())
923 gpio_set_value(udc->board.pullup_pin, !active);
924 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
925 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
926
927 txvc &= ~AT91_UDP_TXVC_PUON;
928 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
929 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
930 u32 usbpucr;
931
932 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
933 usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
934 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
935 }
936 clk_off(udc);
937 }
938 }
939
940 /* vbus is here! turn everything on that's ready */
941 static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
942 {
943 struct at91_udc *udc = to_udc(gadget);
944 unsigned long flags;
945
946 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
947 spin_lock_irqsave(&udc->lock, flags);
948 udc->vbus = (is_active != 0);
949 if (udc->driver)
950 pullup(udc, is_active);
951 else
952 pullup(udc, 0);
953 spin_unlock_irqrestore(&udc->lock, flags);
954 return 0;
955 }
956
957 static int at91_pullup(struct usb_gadget *gadget, int is_on)
958 {
959 struct at91_udc *udc = to_udc(gadget);
960 unsigned long flags;
961
962 spin_lock_irqsave(&udc->lock, flags);
963 udc->enabled = is_on = !!is_on;
964 pullup(udc, is_on);
965 spin_unlock_irqrestore(&udc->lock, flags);
966 return 0;
967 }
968
969 static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
970 {
971 struct at91_udc *udc = to_udc(gadget);
972 unsigned long flags;
973
974 spin_lock_irqsave(&udc->lock, flags);
975 udc->selfpowered = (is_on != 0);
976 spin_unlock_irqrestore(&udc->lock, flags);
977 return 0;
978 }
979
980 static int at91_start(struct usb_gadget_driver *driver,
981 int (*bind)(struct usb_gadget *));
982 static int at91_stop(struct usb_gadget_driver *driver);
983
984 static const struct usb_gadget_ops at91_udc_ops = {
985 .get_frame = at91_get_frame,
986 .wakeup = at91_wakeup,
987 .set_selfpowered = at91_set_selfpowered,
988 .vbus_session = at91_vbus_session,
989 .pullup = at91_pullup,
990 .start = at91_start,
991 .stop = at91_stop,
992
993 /*
994 * VBUS-powered devices may also also want to support bigger
995 * power budgets after an appropriate SET_CONFIGURATION.
996 */
997 /* .vbus_power = at91_vbus_power, */
998 };
999
1000 /*-------------------------------------------------------------------------*/
1001
1002 static int handle_ep(struct at91_ep *ep)
1003 {
1004 struct at91_request *req;
1005 u32 __iomem *creg = ep->creg;
1006 u32 csr = __raw_readl(creg);
1007
1008 if (!list_empty(&ep->queue))
1009 req = list_entry(ep->queue.next,
1010 struct at91_request, queue);
1011 else
1012 req = NULL;
1013
1014 if (ep->is_in) {
1015 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1016 csr |= CLR_FX;
1017 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1018 __raw_writel(csr, creg);
1019 }
1020 if (req)
1021 return write_fifo(ep, req);
1022
1023 } else {
1024 if (csr & AT91_UDP_STALLSENT) {
1025 /* STALLSENT bit == ISOERR */
1026 if (ep->is_iso && req)
1027 req->req.status = -EILSEQ;
1028 csr |= CLR_FX;
1029 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1030 __raw_writel(csr, creg);
1031 csr = __raw_readl(creg);
1032 }
1033 if (req && (csr & RX_DATA_READY))
1034 return read_fifo(ep, req);
1035 }
1036 return 0;
1037 }
1038
1039 union setup {
1040 u8 raw[8];
1041 struct usb_ctrlrequest r;
1042 };
1043
1044 static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1045 {
1046 u32 __iomem *creg = ep->creg;
1047 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1048 unsigned rxcount, i = 0;
1049 u32 tmp;
1050 union setup pkt;
1051 int status = 0;
1052
1053 /* read and ack SETUP; hard-fail for bogus packets */
1054 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1055 if (likely(rxcount == 8)) {
1056 while (rxcount--)
1057 pkt.raw[i++] = __raw_readb(dreg);
1058 if (pkt.r.bRequestType & USB_DIR_IN) {
1059 csr |= AT91_UDP_DIR;
1060 ep->is_in = 1;
1061 } else {
1062 csr &= ~AT91_UDP_DIR;
1063 ep->is_in = 0;
1064 }
1065 } else {
1066 /* REVISIT this happens sometimes under load; why?? */
1067 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1068 status = -EINVAL;
1069 }
1070 csr |= CLR_FX;
1071 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1072 __raw_writel(csr, creg);
1073 udc->wait_for_addr_ack = 0;
1074 udc->wait_for_config_ack = 0;
1075 ep->stopped = 0;
1076 if (unlikely(status != 0))
1077 goto stall;
1078
1079 #define w_index le16_to_cpu(pkt.r.wIndex)
1080 #define w_value le16_to_cpu(pkt.r.wValue)
1081 #define w_length le16_to_cpu(pkt.r.wLength)
1082
1083 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1084 pkt.r.bRequestType, pkt.r.bRequest,
1085 w_value, w_index, w_length);
1086
1087 /*
1088 * A few standard requests get handled here, ones that touch
1089 * hardware ... notably for device and endpoint features.
1090 */
1091 udc->req_pending = 1;
1092 csr = __raw_readl(creg);
1093 csr |= CLR_FX;
1094 csr &= ~SET_FX;
1095 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1096
1097 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1098 | USB_REQ_SET_ADDRESS:
1099 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1100 udc->addr = w_value;
1101 udc->wait_for_addr_ack = 1;
1102 udc->req_pending = 0;
1103 /* FADDR is set later, when we ack host STATUS */
1104 return;
1105
1106 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1107 | USB_REQ_SET_CONFIGURATION:
1108 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1109 if (pkt.r.wValue)
1110 udc->wait_for_config_ack = (tmp == 0);
1111 else
1112 udc->wait_for_config_ack = (tmp != 0);
1113 if (udc->wait_for_config_ack)
1114 VDBG("wait for config\n");
1115 /* CONFG is toggled later, if gadget driver succeeds */
1116 break;
1117
1118 /*
1119 * Hosts may set or clear remote wakeup status, and
1120 * devices may report they're VBUS powered.
1121 */
1122 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1123 | USB_REQ_GET_STATUS:
1124 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1125 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1126 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1127 PACKET("get device status\n");
1128 __raw_writeb(tmp, dreg);
1129 __raw_writeb(0, dreg);
1130 goto write_in;
1131 /* then STATUS starts later, automatically */
1132 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1133 | USB_REQ_SET_FEATURE:
1134 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1135 goto stall;
1136 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1137 tmp |= AT91_UDP_ESR;
1138 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1139 goto succeed;
1140 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1141 | USB_REQ_CLEAR_FEATURE:
1142 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1143 goto stall;
1144 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1145 tmp &= ~AT91_UDP_ESR;
1146 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1147 goto succeed;
1148
1149 /*
1150 * Interfaces have no feature settings; this is pretty useless.
1151 * we won't even insist the interface exists...
1152 */
1153 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1154 | USB_REQ_GET_STATUS:
1155 PACKET("get interface status\n");
1156 __raw_writeb(0, dreg);
1157 __raw_writeb(0, dreg);
1158 goto write_in;
1159 /* then STATUS starts later, automatically */
1160 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1161 | USB_REQ_SET_FEATURE:
1162 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1163 | USB_REQ_CLEAR_FEATURE:
1164 goto stall;
1165
1166 /*
1167 * Hosts may clear bulk/intr endpoint halt after the gadget
1168 * driver sets it (not widely used); or set it (for testing)
1169 */
1170 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1171 | USB_REQ_GET_STATUS:
1172 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1173 ep = &udc->ep[tmp];
1174 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->desc))
1175 goto stall;
1176
1177 if (tmp) {
1178 if ((w_index & USB_DIR_IN)) {
1179 if (!ep->is_in)
1180 goto stall;
1181 } else if (ep->is_in)
1182 goto stall;
1183 }
1184 PACKET("get %s status\n", ep->ep.name);
1185 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1186 tmp = (1 << USB_ENDPOINT_HALT);
1187 else
1188 tmp = 0;
1189 __raw_writeb(tmp, dreg);
1190 __raw_writeb(0, dreg);
1191 goto write_in;
1192 /* then STATUS starts later, automatically */
1193 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1194 | USB_REQ_SET_FEATURE:
1195 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1196 ep = &udc->ep[tmp];
1197 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1198 goto stall;
1199 if (!ep->desc || ep->is_iso)
1200 goto stall;
1201 if ((w_index & USB_DIR_IN)) {
1202 if (!ep->is_in)
1203 goto stall;
1204 } else if (ep->is_in)
1205 goto stall;
1206
1207 tmp = __raw_readl(ep->creg);
1208 tmp &= ~SET_FX;
1209 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1210 __raw_writel(tmp, ep->creg);
1211 goto succeed;
1212 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1213 | USB_REQ_CLEAR_FEATURE:
1214 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1215 ep = &udc->ep[tmp];
1216 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1217 goto stall;
1218 if (tmp == 0)
1219 goto succeed;
1220 if (!ep->desc || ep->is_iso)
1221 goto stall;
1222 if ((w_index & USB_DIR_IN)) {
1223 if (!ep->is_in)
1224 goto stall;
1225 } else if (ep->is_in)
1226 goto stall;
1227
1228 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1229 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1230 tmp = __raw_readl(ep->creg);
1231 tmp |= CLR_FX;
1232 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1233 __raw_writel(tmp, ep->creg);
1234 if (!list_empty(&ep->queue))
1235 handle_ep(ep);
1236 goto succeed;
1237 }
1238
1239 #undef w_value
1240 #undef w_index
1241 #undef w_length
1242
1243 /* pass request up to the gadget driver */
1244 if (udc->driver) {
1245 spin_unlock(&udc->lock);
1246 status = udc->driver->setup(&udc->gadget, &pkt.r);
1247 spin_lock(&udc->lock);
1248 }
1249 else
1250 status = -ENODEV;
1251 if (status < 0) {
1252 stall:
1253 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1254 pkt.r.bRequestType, pkt.r.bRequest, status);
1255 csr |= AT91_UDP_FORCESTALL;
1256 __raw_writel(csr, creg);
1257 udc->req_pending = 0;
1258 }
1259 return;
1260
1261 succeed:
1262 /* immediate successful (IN) STATUS after zero length DATA */
1263 PACKET("ep0 in/status\n");
1264 write_in:
1265 csr |= AT91_UDP_TXPKTRDY;
1266 __raw_writel(csr, creg);
1267 udc->req_pending = 0;
1268 }
1269
1270 static void handle_ep0(struct at91_udc *udc)
1271 {
1272 struct at91_ep *ep0 = &udc->ep[0];
1273 u32 __iomem *creg = ep0->creg;
1274 u32 csr = __raw_readl(creg);
1275 struct at91_request *req;
1276
1277 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1278 nuke(ep0, -EPROTO);
1279 udc->req_pending = 0;
1280 csr |= CLR_FX;
1281 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1282 __raw_writel(csr, creg);
1283 VDBG("ep0 stalled\n");
1284 csr = __raw_readl(creg);
1285 }
1286 if (csr & AT91_UDP_RXSETUP) {
1287 nuke(ep0, 0);
1288 udc->req_pending = 0;
1289 handle_setup(udc, ep0, csr);
1290 return;
1291 }
1292
1293 if (list_empty(&ep0->queue))
1294 req = NULL;
1295 else
1296 req = list_entry(ep0->queue.next, struct at91_request, queue);
1297
1298 /* host ACKed an IN packet that we sent */
1299 if (csr & AT91_UDP_TXCOMP) {
1300 csr |= CLR_FX;
1301 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1302
1303 /* write more IN DATA? */
1304 if (req && ep0->is_in) {
1305 if (handle_ep(ep0))
1306 udc->req_pending = 0;
1307
1308 /*
1309 * Ack after:
1310 * - last IN DATA packet (including GET_STATUS)
1311 * - IN/STATUS for OUT DATA
1312 * - IN/STATUS for any zero-length DATA stage
1313 * except for the IN DATA case, the host should send
1314 * an OUT status later, which we'll ack.
1315 */
1316 } else {
1317 udc->req_pending = 0;
1318 __raw_writel(csr, creg);
1319
1320 /*
1321 * SET_ADDRESS takes effect only after the STATUS
1322 * (to the original address) gets acked.
1323 */
1324 if (udc->wait_for_addr_ack) {
1325 u32 tmp;
1326
1327 at91_udp_write(udc, AT91_UDP_FADDR,
1328 AT91_UDP_FEN | udc->addr);
1329 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1330 tmp &= ~AT91_UDP_FADDEN;
1331 if (udc->addr)
1332 tmp |= AT91_UDP_FADDEN;
1333 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1334
1335 udc->wait_for_addr_ack = 0;
1336 VDBG("address %d\n", udc->addr);
1337 }
1338 }
1339 }
1340
1341 /* OUT packet arrived ... */
1342 else if (csr & AT91_UDP_RX_DATA_BK0) {
1343 csr |= CLR_FX;
1344 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1345
1346 /* OUT DATA stage */
1347 if (!ep0->is_in) {
1348 if (req) {
1349 if (handle_ep(ep0)) {
1350 /* send IN/STATUS */
1351 PACKET("ep0 in/status\n");
1352 csr = __raw_readl(creg);
1353 csr &= ~SET_FX;
1354 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1355 __raw_writel(csr, creg);
1356 udc->req_pending = 0;
1357 }
1358 } else if (udc->req_pending) {
1359 /*
1360 * AT91 hardware has a hard time with this
1361 * "deferred response" mode for control-OUT
1362 * transfers. (For control-IN it's fine.)
1363 *
1364 * The normal solution leaves OUT data in the
1365 * fifo until the gadget driver is ready.
1366 * We couldn't do that here without disabling
1367 * the IRQ that tells about SETUP packets,
1368 * e.g. when the host gets impatient...
1369 *
1370 * Working around it by copying into a buffer
1371 * would almost be a non-deferred response,
1372 * except that it wouldn't permit reliable
1373 * stalling of the request. Instead, demand
1374 * that gadget drivers not use this mode.
1375 */
1376 DBG("no control-OUT deferred responses!\n");
1377 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1378 udc->req_pending = 0;
1379 }
1380
1381 /* STATUS stage for control-IN; ack. */
1382 } else {
1383 PACKET("ep0 out/status ACK\n");
1384 __raw_writel(csr, creg);
1385
1386 /* "early" status stage */
1387 if (req)
1388 done(ep0, req, 0);
1389 }
1390 }
1391 }
1392
1393 static irqreturn_t at91_udc_irq (int irq, void *_udc)
1394 {
1395 struct at91_udc *udc = _udc;
1396 u32 rescans = 5;
1397 int disable_clock = 0;
1398 unsigned long flags;
1399
1400 spin_lock_irqsave(&udc->lock, flags);
1401
1402 if (!udc->clocked) {
1403 clk_on(udc);
1404 disable_clock = 1;
1405 }
1406
1407 while (rescans--) {
1408 u32 status;
1409
1410 status = at91_udp_read(udc, AT91_UDP_ISR)
1411 & at91_udp_read(udc, AT91_UDP_IMR);
1412 if (!status)
1413 break;
1414
1415 /* USB reset irq: not maskable */
1416 if (status & AT91_UDP_ENDBUSRES) {
1417 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1418 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1419 /* Atmel code clears this irq twice */
1420 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1421 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1422 VDBG("end bus reset\n");
1423 udc->addr = 0;
1424 stop_activity(udc);
1425
1426 /* enable ep0 */
1427 at91_udp_write(udc, AT91_UDP_CSR(0),
1428 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1429 udc->gadget.speed = USB_SPEED_FULL;
1430 udc->suspended = 0;
1431 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1432
1433 /*
1434 * NOTE: this driver keeps clocks off unless the
1435 * USB host is present. That saves power, but for
1436 * boards that don't support VBUS detection, both
1437 * clocks need to be active most of the time.
1438 */
1439
1440 /* host initiated suspend (3+ms bus idle) */
1441 } else if (status & AT91_UDP_RXSUSP) {
1442 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1443 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1444 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1445 /* VDBG("bus suspend\n"); */
1446 if (udc->suspended)
1447 continue;
1448 udc->suspended = 1;
1449
1450 /*
1451 * NOTE: when suspending a VBUS-powered device, the
1452 * gadget driver should switch into slow clock mode
1453 * and then into standby to avoid drawing more than
1454 * 500uA power (2500uA for some high-power configs).
1455 */
1456 if (udc->driver && udc->driver->suspend) {
1457 spin_unlock(&udc->lock);
1458 udc->driver->suspend(&udc->gadget);
1459 spin_lock(&udc->lock);
1460 }
1461
1462 /* host initiated resume */
1463 } else if (status & AT91_UDP_RXRSM) {
1464 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1465 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1466 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1467 /* VDBG("bus resume\n"); */
1468 if (!udc->suspended)
1469 continue;
1470 udc->suspended = 0;
1471
1472 /*
1473 * NOTE: for a VBUS-powered device, the gadget driver
1474 * would normally want to switch out of slow clock
1475 * mode into normal mode.
1476 */
1477 if (udc->driver && udc->driver->resume) {
1478 spin_unlock(&udc->lock);
1479 udc->driver->resume(&udc->gadget);
1480 spin_lock(&udc->lock);
1481 }
1482
1483 /* endpoint IRQs are cleared by handling them */
1484 } else {
1485 int i;
1486 unsigned mask = 1;
1487 struct at91_ep *ep = &udc->ep[1];
1488
1489 if (status & mask)
1490 handle_ep0(udc);
1491 for (i = 1; i < NUM_ENDPOINTS; i++) {
1492 mask <<= 1;
1493 if (status & mask)
1494 handle_ep(ep);
1495 ep++;
1496 }
1497 }
1498 }
1499
1500 if (disable_clock)
1501 clk_off(udc);
1502
1503 spin_unlock_irqrestore(&udc->lock, flags);
1504
1505 return IRQ_HANDLED;
1506 }
1507
1508 /*-------------------------------------------------------------------------*/
1509
1510 static void nop_release(struct device *dev)
1511 {
1512 /* nothing to free */
1513 }
1514
1515 static struct at91_udc controller = {
1516 .gadget = {
1517 .ops = &at91_udc_ops,
1518 .ep0 = &controller.ep[0].ep,
1519 .name = driver_name,
1520 .dev = {
1521 .init_name = "gadget",
1522 .release = nop_release,
1523 }
1524 },
1525 .ep[0] = {
1526 .ep = {
1527 .name = ep0name,
1528 .ops = &at91_ep_ops,
1529 },
1530 .udc = &controller,
1531 .maxpacket = 8,
1532 .int_mask = 1 << 0,
1533 },
1534 .ep[1] = {
1535 .ep = {
1536 .name = "ep1",
1537 .ops = &at91_ep_ops,
1538 },
1539 .udc = &controller,
1540 .is_pingpong = 1,
1541 .maxpacket = 64,
1542 .int_mask = 1 << 1,
1543 },
1544 .ep[2] = {
1545 .ep = {
1546 .name = "ep2",
1547 .ops = &at91_ep_ops,
1548 },
1549 .udc = &controller,
1550 .is_pingpong = 1,
1551 .maxpacket = 64,
1552 .int_mask = 1 << 2,
1553 },
1554 .ep[3] = {
1555 .ep = {
1556 /* could actually do bulk too */
1557 .name = "ep3-int",
1558 .ops = &at91_ep_ops,
1559 },
1560 .udc = &controller,
1561 .maxpacket = 8,
1562 .int_mask = 1 << 3,
1563 },
1564 .ep[4] = {
1565 .ep = {
1566 .name = "ep4",
1567 .ops = &at91_ep_ops,
1568 },
1569 .udc = &controller,
1570 .is_pingpong = 1,
1571 .maxpacket = 256,
1572 .int_mask = 1 << 4,
1573 },
1574 .ep[5] = {
1575 .ep = {
1576 .name = "ep5",
1577 .ops = &at91_ep_ops,
1578 },
1579 .udc = &controller,
1580 .is_pingpong = 1,
1581 .maxpacket = 256,
1582 .int_mask = 1 << 5,
1583 },
1584 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1585 };
1586
1587 static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1588 {
1589 value ^= udc->board.vbus_active_low;
1590 if (value != udc->vbus)
1591 at91_vbus_session(&udc->gadget, value);
1592 }
1593
1594 static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1595 {
1596 struct at91_udc *udc = _udc;
1597
1598 /* vbus needs at least brief debouncing */
1599 udelay(10);
1600 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1601
1602 return IRQ_HANDLED;
1603 }
1604
1605 static void at91_vbus_timer_work(struct work_struct *work)
1606 {
1607 struct at91_udc *udc = container_of(work, struct at91_udc,
1608 vbus_timer_work);
1609
1610 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1611
1612 if (!timer_pending(&udc->vbus_timer))
1613 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1614 }
1615
1616 static void at91_vbus_timer(unsigned long data)
1617 {
1618 struct at91_udc *udc = (struct at91_udc *)data;
1619
1620 /*
1621 * If we are polling vbus it is likely that the gpio is on an
1622 * bus such as i2c or spi which may sleep, so schedule some work
1623 * to read the vbus gpio
1624 */
1625 if (!work_pending(&udc->vbus_timer_work))
1626 schedule_work(&udc->vbus_timer_work);
1627 }
1628
1629 static int at91_start(struct usb_gadget_driver *driver,
1630 int (*bind)(struct usb_gadget *))
1631 {
1632 struct at91_udc *udc = &controller;
1633 int retval;
1634 unsigned long flags;
1635
1636 if (!driver
1637 || driver->max_speed < USB_SPEED_FULL
1638 || !bind
1639 || !driver->setup) {
1640 DBG("bad parameter.\n");
1641 return -EINVAL;
1642 }
1643
1644 if (udc->driver) {
1645 DBG("UDC already has a gadget driver\n");
1646 return -EBUSY;
1647 }
1648
1649 udc->driver = driver;
1650 udc->gadget.dev.driver = &driver->driver;
1651 dev_set_drvdata(&udc->gadget.dev, &driver->driver);
1652 udc->enabled = 1;
1653 udc->selfpowered = 1;
1654
1655 retval = bind(&udc->gadget);
1656 if (retval) {
1657 DBG("bind() returned %d\n", retval);
1658 udc->driver = NULL;
1659 udc->gadget.dev.driver = NULL;
1660 dev_set_drvdata(&udc->gadget.dev, NULL);
1661 udc->enabled = 0;
1662 udc->selfpowered = 0;
1663 return retval;
1664 }
1665
1666 spin_lock_irqsave(&udc->lock, flags);
1667 pullup(udc, 1);
1668 spin_unlock_irqrestore(&udc->lock, flags);
1669
1670 DBG("bound to %s\n", driver->driver.name);
1671 return 0;
1672 }
1673
1674 static int at91_stop(struct usb_gadget_driver *driver)
1675 {
1676 struct at91_udc *udc = &controller;
1677 unsigned long flags;
1678
1679 if (!driver || driver != udc->driver || !driver->unbind)
1680 return -EINVAL;
1681
1682 spin_lock_irqsave(&udc->lock, flags);
1683 udc->enabled = 0;
1684 at91_udp_write(udc, AT91_UDP_IDR, ~0);
1685 pullup(udc, 0);
1686 spin_unlock_irqrestore(&udc->lock, flags);
1687
1688 driver->unbind(&udc->gadget);
1689 udc->gadget.dev.driver = NULL;
1690 dev_set_drvdata(&udc->gadget.dev, NULL);
1691 udc->driver = NULL;
1692
1693 DBG("unbound from %s\n", driver->driver.name);
1694 return 0;
1695 }
1696
1697 /*-------------------------------------------------------------------------*/
1698
1699 static void at91udc_shutdown(struct platform_device *dev)
1700 {
1701 struct at91_udc *udc = platform_get_drvdata(dev);
1702 unsigned long flags;
1703
1704 /* force disconnect on reboot */
1705 spin_lock_irqsave(&udc->lock, flags);
1706 pullup(platform_get_drvdata(dev), 0);
1707 spin_unlock_irqrestore(&udc->lock, flags);
1708 }
1709
1710 static int __init at91udc_probe(struct platform_device *pdev)
1711 {
1712 struct device *dev = &pdev->dev;
1713 struct at91_udc *udc;
1714 int retval;
1715 struct resource *res;
1716
1717 if (!dev->platform_data) {
1718 /* small (so we copy it) but critical! */
1719 DBG("missing platform_data\n");
1720 return -ENODEV;
1721 }
1722
1723 if (pdev->num_resources != 2) {
1724 DBG("invalid num_resources\n");
1725 return -ENODEV;
1726 }
1727 if ((pdev->resource[0].flags != IORESOURCE_MEM)
1728 || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1729 DBG("invalid resource type\n");
1730 return -ENODEV;
1731 }
1732
1733 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1734 if (!res)
1735 return -ENXIO;
1736
1737 if (!request_mem_region(res->start, resource_size(res), driver_name)) {
1738 DBG("someone's using UDC memory\n");
1739 return -EBUSY;
1740 }
1741
1742 /* init software state */
1743 udc = &controller;
1744 udc->gadget.dev.parent = dev;
1745 udc->board = *(struct at91_udc_data *) dev->platform_data;
1746 udc->pdev = pdev;
1747 udc->enabled = 0;
1748 spin_lock_init(&udc->lock);
1749
1750 /* rm9200 needs manual D+ pullup; off by default */
1751 if (cpu_is_at91rm9200()) {
1752 if (gpio_is_valid(udc->board.pullup_pin)) {
1753 DBG("no D+ pullup?\n");
1754 retval = -ENODEV;
1755 goto fail0;
1756 }
1757 retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
1758 if (retval) {
1759 DBG("D+ pullup is busy\n");
1760 goto fail0;
1761 }
1762 gpio_direction_output(udc->board.pullup_pin,
1763 udc->board.pullup_active_low);
1764 }
1765
1766 /* newer chips have more FIFO memory than rm9200 */
1767 if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
1768 udc->ep[0].maxpacket = 64;
1769 udc->ep[3].maxpacket = 64;
1770 udc->ep[4].maxpacket = 512;
1771 udc->ep[5].maxpacket = 512;
1772 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1773 udc->ep[3].maxpacket = 64;
1774 } else if (cpu_is_at91sam9263()) {
1775 udc->ep[0].maxpacket = 64;
1776 udc->ep[3].maxpacket = 64;
1777 }
1778
1779 udc->udp_baseaddr = ioremap(res->start, resource_size(res));
1780 if (!udc->udp_baseaddr) {
1781 retval = -ENOMEM;
1782 goto fail0a;
1783 }
1784
1785 udc_reinit(udc);
1786
1787 /* get interface and function clocks */
1788 udc->iclk = clk_get(dev, "udc_clk");
1789 udc->fclk = clk_get(dev, "udpck");
1790 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
1791 DBG("clocks missing\n");
1792 retval = -ENODEV;
1793 /* NOTE: we "know" here that refcounts on these are NOPs */
1794 goto fail0b;
1795 }
1796
1797 retval = device_register(&udc->gadget.dev);
1798 if (retval < 0) {
1799 put_device(&udc->gadget.dev);
1800 goto fail0b;
1801 }
1802
1803 /* don't do anything until we have both gadget driver and VBUS */
1804 clk_enable(udc->iclk);
1805 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1806 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1807 /* Clear all pending interrupts - UDP may be used by bootloader. */
1808 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1809 clk_disable(udc->iclk);
1810
1811 /* request UDC and maybe VBUS irqs */
1812 udc->udp_irq = platform_get_irq(pdev, 0);
1813 retval = request_irq(udc->udp_irq, at91_udc_irq,
1814 0, driver_name, udc);
1815 if (retval < 0) {
1816 DBG("request irq %d failed\n", udc->udp_irq);
1817 goto fail1;
1818 }
1819 if (gpio_is_valid(udc->board.vbus_pin)) {
1820 retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
1821 if (retval < 0) {
1822 DBG("request vbus pin failed\n");
1823 goto fail2;
1824 }
1825 gpio_direction_input(udc->board.vbus_pin);
1826
1827 /*
1828 * Get the initial state of VBUS - we cannot expect
1829 * a pending interrupt.
1830 */
1831 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1832 udc->board.vbus_active_low;
1833
1834 if (udc->board.vbus_polled) {
1835 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1836 setup_timer(&udc->vbus_timer, at91_vbus_timer,
1837 (unsigned long)udc);
1838 mod_timer(&udc->vbus_timer,
1839 jiffies + VBUS_POLL_TIMEOUT);
1840 } else {
1841 if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
1842 0, driver_name, udc)) {
1843 DBG("request vbus irq %d failed\n",
1844 udc->board.vbus_pin);
1845 retval = -EBUSY;
1846 goto fail3;
1847 }
1848 }
1849 } else {
1850 DBG("no VBUS detection, assuming always-on\n");
1851 udc->vbus = 1;
1852 }
1853 retval = usb_add_gadget_udc(dev, &udc->gadget);
1854 if (retval)
1855 goto fail4;
1856 dev_set_drvdata(dev, udc);
1857 device_init_wakeup(dev, 1);
1858 create_debug_file(udc);
1859
1860 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1861 return 0;
1862 fail4:
1863 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled)
1864 free_irq(udc->board.vbus_pin, udc);
1865 fail3:
1866 if (gpio_is_valid(udc->board.vbus_pin))
1867 gpio_free(udc->board.vbus_pin);
1868 fail2:
1869 free_irq(udc->udp_irq, udc);
1870 fail1:
1871 device_unregister(&udc->gadget.dev);
1872 fail0b:
1873 iounmap(udc->udp_baseaddr);
1874 fail0a:
1875 if (cpu_is_at91rm9200())
1876 gpio_free(udc->board.pullup_pin);
1877 fail0:
1878 release_mem_region(res->start, resource_size(res));
1879 DBG("%s probe failed, %d\n", driver_name, retval);
1880 return retval;
1881 }
1882
1883 static int __exit at91udc_remove(struct platform_device *pdev)
1884 {
1885 struct at91_udc *udc = platform_get_drvdata(pdev);
1886 struct resource *res;
1887 unsigned long flags;
1888
1889 DBG("remove\n");
1890
1891 usb_del_gadget_udc(&udc->gadget);
1892 if (udc->driver)
1893 return -EBUSY;
1894
1895 spin_lock_irqsave(&udc->lock, flags);
1896 pullup(udc, 0);
1897 spin_unlock_irqrestore(&udc->lock, flags);
1898
1899 device_init_wakeup(&pdev->dev, 0);
1900 remove_debug_file(udc);
1901 if (gpio_is_valid(udc->board.vbus_pin)) {
1902 free_irq(udc->board.vbus_pin, udc);
1903 gpio_free(udc->board.vbus_pin);
1904 }
1905 free_irq(udc->udp_irq, udc);
1906 device_unregister(&udc->gadget.dev);
1907
1908 iounmap(udc->udp_baseaddr);
1909
1910 if (cpu_is_at91rm9200())
1911 gpio_free(udc->board.pullup_pin);
1912
1913 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1914 release_mem_region(res->start, resource_size(res));
1915
1916 clk_put(udc->iclk);
1917 clk_put(udc->fclk);
1918
1919 return 0;
1920 }
1921
1922 #ifdef CONFIG_PM
1923 static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1924 {
1925 struct at91_udc *udc = platform_get_drvdata(pdev);
1926 int wake = udc->driver && device_may_wakeup(&pdev->dev);
1927 unsigned long flags;
1928
1929 /* Unless we can act normally to the host (letting it wake us up
1930 * whenever it has work for us) force disconnect. Wakeup requires
1931 * PLLB for USB events (signaling for reset, wakeup, or incoming
1932 * tokens) and VBUS irqs (on systems which support them).
1933 */
1934 if ((!udc->suspended && udc->addr)
1935 || !wake
1936 || at91_suspend_entering_slow_clock()) {
1937 spin_lock_irqsave(&udc->lock, flags);
1938 pullup(udc, 0);
1939 wake = 0;
1940 spin_unlock_irqrestore(&udc->lock, flags);
1941 } else
1942 enable_irq_wake(udc->udp_irq);
1943
1944 udc->active_suspend = wake;
1945 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
1946 enable_irq_wake(udc->board.vbus_pin);
1947 return 0;
1948 }
1949
1950 static int at91udc_resume(struct platform_device *pdev)
1951 {
1952 struct at91_udc *udc = platform_get_drvdata(pdev);
1953 unsigned long flags;
1954
1955 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
1956 udc->active_suspend)
1957 disable_irq_wake(udc->board.vbus_pin);
1958
1959 /* maybe reconnect to host; if so, clocks on */
1960 if (udc->active_suspend)
1961 disable_irq_wake(udc->udp_irq);
1962 else {
1963 spin_lock_irqsave(&udc->lock, flags);
1964 pullup(udc, 1);
1965 spin_unlock_irqrestore(&udc->lock, flags);
1966 }
1967 return 0;
1968 }
1969 #else
1970 #define at91udc_suspend NULL
1971 #define at91udc_resume NULL
1972 #endif
1973
1974 static struct platform_driver at91_udc_driver = {
1975 .remove = __exit_p(at91udc_remove),
1976 .shutdown = at91udc_shutdown,
1977 .suspend = at91udc_suspend,
1978 .resume = at91udc_resume,
1979 .driver = {
1980 .name = (char *) driver_name,
1981 .owner = THIS_MODULE,
1982 },
1983 };
1984
1985 static int __init udc_init_module(void)
1986 {
1987 return platform_driver_probe(&at91_udc_driver, at91udc_probe);
1988 }
1989 module_init(udc_init_module);
1990
1991 static void __exit udc_exit_module(void)
1992 {
1993 platform_driver_unregister(&at91_udc_driver);
1994 }
1995 module_exit(udc_exit_module);
1996
1997 MODULE_DESCRIPTION("AT91 udc driver");
1998 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1999 MODULE_LICENSE("GPL");
2000 MODULE_ALIAS("platform:at91_udc");