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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/of.h>
33#include <linux/of_gpio.h>
34
35#include <asm/byteorder.h>
36#include <mach/hardware.h>
37#include <asm/io.h>
38#include <asm/irq.h>
39#include <asm/gpio.h>
40
41#include <mach/board.h>
42#include <mach/cpu.h>
43#include <mach/at91sam9261_matrix.h>
44#include <mach/at91_matrix.h>
45
46#include "at91_udc.h"
47
48
49/*
50 * This controller is simple and PIO-only. It's used in many AT91-series
51 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
52 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
53 *
54 * This driver expects the board has been wired with two GPIOs suppporting
55 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
56 * testing hasn't covered such cases.)
57 *
58 * The pullup is most important (so it's integrated on sam926x parts). It
59 * provides software control over whether the host enumerates the device.
60 *
61 * The VBUS sensing helps during enumeration, and allows both USB clocks
62 * (and the transceiver) to stay gated off until they're necessary, saving
63 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
64 * it may also be gated off by software during some Linux sleep states.
65 */
66
67#define DRIVER_VERSION "3 May 2006"
68
69static const char driver_name [] = "at91_udc";
70static const char ep0name[] = "ep0";
71
72#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
73
74#define at91_udp_read(udc, reg) \
75 __raw_readl((udc)->udp_baseaddr + (reg))
76#define at91_udp_write(udc, reg, val) \
77 __raw_writel((val), (udc)->udp_baseaddr + (reg))
78
79/*-------------------------------------------------------------------------*/
80
81#ifdef CONFIG_USB_GADGET_DEBUG_FILES
82
83#include <linux/seq_file.h>
84
85static const char debug_filename[] = "driver/udc";
86
87#define FOURBITS "%s%s%s%s"
88#define EIGHTBITS FOURBITS FOURBITS
89
90static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
91{
92 static char *types[] = {
93 "control", "out-iso", "out-bulk", "out-int",
94 "BOGUS", "in-iso", "in-bulk", "in-int"};
95
96 u32 csr;
97 struct at91_request *req;
98 unsigned long flags;
99 struct at91_udc *udc = ep->udc;
100
101 spin_lock_irqsave(&udc->lock, flags);
102
103 csr = __raw_readl(ep->creg);
104
105 /* NOTE: not collecting per-endpoint irq statistics... */
106
107 seq_printf(s, "\n");
108 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
109 ep->ep.name, ep->ep.maxpacket,
110 ep->is_in ? "in" : "out",
111 ep->is_iso ? " iso" : "",
112 ep->is_pingpong
113 ? (ep->fifo_bank ? "pong" : "ping")
114 : "",
115 ep->stopped ? " stopped" : "");
116 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
117 csr,
118 (csr & 0x07ff0000) >> 16,
119 (csr & (1 << 15)) ? "enabled" : "disabled",
120 (csr & (1 << 11)) ? "DATA1" : "DATA0",
121 types[(csr & 0x700) >> 8],
122
123 /* iff type is control then print current direction */
124 (!(csr & 0x700))
125 ? ((csr & (1 << 7)) ? " IN" : " OUT")
126 : "",
127 (csr & (1 << 6)) ? " rxdatabk1" : "",
128 (csr & (1 << 5)) ? " forcestall" : "",
129 (csr & (1 << 4)) ? " txpktrdy" : "",
130
131 (csr & (1 << 3)) ? " stallsent" : "",
132 (csr & (1 << 2)) ? " rxsetup" : "",
133 (csr & (1 << 1)) ? " rxdatabk0" : "",
134 (csr & (1 << 0)) ? " txcomp" : "");
135 if (list_empty (&ep->queue))
136 seq_printf(s, "\t(queue empty)\n");
137
138 else list_for_each_entry (req, &ep->queue, queue) {
139 unsigned length = req->req.actual;
140
141 seq_printf(s, "\treq %p len %d/%d buf %p\n",
142 &req->req, length,
143 req->req.length, req->req.buf);
144 }
145 spin_unlock_irqrestore(&udc->lock, flags);
146}
147
148static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
149{
150 int i;
151
152 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
153 (mask & (1 << 13)) ? " wakeup" : "",
154 (mask & (1 << 12)) ? " endbusres" : "",
155
156 (mask & (1 << 11)) ? " sofint" : "",
157 (mask & (1 << 10)) ? " extrsm" : "",
158 (mask & (1 << 9)) ? " rxrsm" : "",
159 (mask & (1 << 8)) ? " rxsusp" : "");
160 for (i = 0; i < 8; i++) {
161 if (mask & (1 << i))
162 seq_printf(s, " ep%d", i);
163 }
164 seq_printf(s, "\n");
165}
166
167static int proc_udc_show(struct seq_file *s, void *unused)
168{
169 struct at91_udc *udc = s->private;
170 struct at91_ep *ep;
171 u32 tmp;
172
173 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
174
175 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
176 udc->vbus ? "present" : "off",
177 udc->enabled
178 ? (udc->vbus ? "active" : "enabled")
179 : "disabled",
180 udc->selfpowered ? "self" : "VBUS",
181 udc->suspended ? ", suspended" : "",
182 udc->driver ? udc->driver->driver.name : "(none)");
183
184 /* don't access registers when interface isn't clocked */
185 if (!udc->clocked) {
186 seq_printf(s, "(not clocked)\n");
187 return 0;
188 }
189
190 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
191 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
192 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
193 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
194 (tmp & AT91_UDP_NUM));
195
196 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
197 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
198 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
199 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
200 (tmp & AT91_UDP_ESR) ? " esr" : "",
201 (tmp & AT91_UDP_CONFG) ? " confg" : "",
202 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
203
204 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
205 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
206 (tmp & AT91_UDP_FEN) ? " fen" : "",
207 (tmp & AT91_UDP_FADD));
208
209 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
210 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
211
212 if (udc->enabled && udc->vbus) {
213 proc_ep_show(s, &udc->ep[0]);
214 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
215 if (ep->ep.desc)
216 proc_ep_show(s, ep);
217 }
218 }
219 return 0;
220}
221
222static int proc_udc_open(struct inode *inode, struct file *file)
223{
224 return single_open(file, proc_udc_show, PDE(inode)->data);
225}
226
227static const struct file_operations proc_ops = {
228 .owner = THIS_MODULE,
229 .open = proc_udc_open,
230 .read = seq_read,
231 .llseek = seq_lseek,
232 .release = single_release,
233};
234
235static void create_debug_file(struct at91_udc *udc)
236{
237 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
238}
239
240static void remove_debug_file(struct at91_udc *udc)
241{
242 if (udc->pde)
243 remove_proc_entry(debug_filename, NULL);
244}
245
246#else
247
248static inline void create_debug_file(struct at91_udc *udc) {}
249static inline void remove_debug_file(struct at91_udc *udc) {}
250
251#endif
252
253
254/*-------------------------------------------------------------------------*/
255
256static void done(struct at91_ep *ep, struct at91_request *req, int status)
257{
258 unsigned stopped = ep->stopped;
259 struct at91_udc *udc = ep->udc;
260
261 list_del_init(&req->queue);
262 if (req->req.status == -EINPROGRESS)
263 req->req.status = status;
264 else
265 status = req->req.status;
266 if (status && status != -ESHUTDOWN)
267 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
268
269 ep->stopped = 1;
270 spin_unlock(&udc->lock);
271 req->req.complete(&ep->ep, &req->req);
272 spin_lock(&udc->lock);
273 ep->stopped = stopped;
274
275 /* ep0 is always ready; other endpoints need a non-empty queue */
276 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
277 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
278}
279
280/*-------------------------------------------------------------------------*/
281
282/* bits indicating OUT fifo has data ready */
283#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
284
285/*
286 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
287 * back most of the value you just read (because of side effects, including
288 * bits that may change after reading and before writing).
289 *
290 * Except when changing a specific bit, always write values which:
291 * - clear SET_FX bits (setting them could change something)
292 * - set CLR_FX bits (clearing them could change something)
293 *
294 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
295 * that shouldn't normally be changed.
296 *
297 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
298 * implying a need to wait for one write to complete (test relevant bits)
299 * before starting the next write. This shouldn't be an issue given how
300 * infrequently we write, except maybe for write-then-read idioms.
301 */
302#define SET_FX (AT91_UDP_TXPKTRDY)
303#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
304 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
305
306/* pull OUT packet data from the endpoint's fifo */
307static int read_fifo (struct at91_ep *ep, struct at91_request *req)
308{
309 u32 __iomem *creg = ep->creg;
310 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
311 u32 csr;
312 u8 *buf;
313 unsigned int count, bufferspace, is_done;
314
315 buf = req->req.buf + req->req.actual;
316 bufferspace = req->req.length - req->req.actual;
317
318 /*
319 * there might be nothing to read if ep_queue() calls us,
320 * or if we already emptied both pingpong buffers
321 */
322rescan:
323 csr = __raw_readl(creg);
324 if ((csr & RX_DATA_READY) == 0)
325 return 0;
326
327 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
328 if (count > ep->ep.maxpacket)
329 count = ep->ep.maxpacket;
330 if (count > bufferspace) {
331 DBG("%s buffer overflow\n", ep->ep.name);
332 req->req.status = -EOVERFLOW;
333 count = bufferspace;
334 }
335 __raw_readsb(dreg, buf, count);
336
337 /* release and swap pingpong mem bank */
338 csr |= CLR_FX;
339 if (ep->is_pingpong) {
340 if (ep->fifo_bank == 0) {
341 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
342 ep->fifo_bank = 1;
343 } else {
344 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
345 ep->fifo_bank = 0;
346 }
347 } else
348 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
349 __raw_writel(csr, creg);
350
351 req->req.actual += count;
352 is_done = (count < ep->ep.maxpacket);
353 if (count == bufferspace)
354 is_done = 1;
355
356 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
357 is_done ? " (done)" : "");
358
359 /*
360 * avoid extra trips through IRQ logic for packets already in
361 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
362 */
363 if (is_done)
364 done(ep, req, 0);
365 else if (ep->is_pingpong) {
366 /*
367 * One dummy read to delay the code because of a HW glitch:
368 * CSR returns bad RXCOUNT when read too soon after updating
369 * RX_DATA_BK flags.
370 */
371 csr = __raw_readl(creg);
372
373 bufferspace -= count;
374 buf += count;
375 goto rescan;
376 }
377
378 return is_done;
379}
380
381/* load fifo for an IN packet */
382static int write_fifo(struct at91_ep *ep, struct at91_request *req)
383{
384 u32 __iomem *creg = ep->creg;
385 u32 csr = __raw_readl(creg);
386 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
387 unsigned total, count, is_last;
388 u8 *buf;
389
390 /*
391 * TODO: allow for writing two packets to the fifo ... that'll
392 * reduce the amount of IN-NAKing, but probably won't affect
393 * throughput much. (Unlike preventing OUT-NAKing!)
394 */
395
396 /*
397 * If ep_queue() calls us, the queue is empty and possibly in
398 * odd states like TXCOMP not yet cleared (we do it, saving at
399 * least one IRQ) or the fifo not yet being free. Those aren't
400 * issues normally (IRQ handler fast path).
401 */
402 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
403 if (csr & AT91_UDP_TXCOMP) {
404 csr |= CLR_FX;
405 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
406 __raw_writel(csr, creg);
407 csr = __raw_readl(creg);
408 }
409 if (csr & AT91_UDP_TXPKTRDY)
410 return 0;
411 }
412
413 buf = req->req.buf + req->req.actual;
414 prefetch(buf);
415 total = req->req.length - req->req.actual;
416 if (ep->ep.maxpacket < total) {
417 count = ep->ep.maxpacket;
418 is_last = 0;
419 } else {
420 count = total;
421 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
422 }
423
424 /*
425 * Write the packet, maybe it's a ZLP.
426 *
427 * NOTE: incrementing req->actual before we receive the ACK means
428 * gadget driver IN bytecounts can be wrong in fault cases. That's
429 * fixable with PIO drivers like this one (save "count" here, and
430 * do the increment later on TX irq), but not for most DMA hardware.
431 *
432 * So all gadget drivers must accept that potential error. Some
433 * hardware supports precise fifo status reporting, letting them
434 * recover when the actual bytecount matters (e.g. for USB Test
435 * and Measurement Class devices).
436 */
437 __raw_writesb(dreg, buf, count);
438 csr &= ~SET_FX;
439 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
440 __raw_writel(csr, creg);
441 req->req.actual += count;
442
443 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
444 is_last ? " (done)" : "");
445 if (is_last)
446 done(ep, req, 0);
447 return is_last;
448}
449
450static void nuke(struct at91_ep *ep, int status)
451{
452 struct at91_request *req;
453
454 /* terminate any request in the queue */
455 ep->stopped = 1;
456 if (list_empty(&ep->queue))
457 return;
458
459 VDBG("%s %s\n", __func__, ep->ep.name);
460 while (!list_empty(&ep->queue)) {
461 req = list_entry(ep->queue.next, struct at91_request, queue);
462 done(ep, req, status);
463 }
464}
465
466/*-------------------------------------------------------------------------*/
467
468static int at91_ep_enable(struct usb_ep *_ep,
469 const struct usb_endpoint_descriptor *desc)
470{
471 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
472 struct at91_udc *udc = ep->udc;
473 u16 maxpacket;
474 u32 tmp;
475 unsigned long flags;
476
477 if (!_ep || !ep
478 || !desc || _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 }
508bogus_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
519ok:
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->ep.maxpacket = maxpacket;
533
534 /*
535 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
536 * since endpoint resets don't reset hw pingpong state.
537 */
538 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
539 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
540
541 spin_unlock_irqrestore(&udc->lock, flags);
542 return 0;
543}
544
545static int at91_ep_disable (struct usb_ep * _ep)
546{
547 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
548 struct at91_udc *udc = ep->udc;
549 unsigned long flags;
550
551 if (ep == &ep->udc->ep[0])
552 return -EINVAL;
553
554 spin_lock_irqsave(&udc->lock, flags);
555
556 nuke(ep, -ESHUTDOWN);
557
558 /* restore the endpoint's pristine config */
559 ep->ep.desc = NULL;
560 ep->ep.maxpacket = ep->maxpacket;
561
562 /* reset fifos and endpoint */
563 if (ep->udc->clocked) {
564 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
565 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
566 __raw_writel(0, ep->creg);
567 }
568
569 spin_unlock_irqrestore(&udc->lock, flags);
570 return 0;
571}
572
573/*
574 * this is a PIO-only driver, so there's nothing
575 * interesting for request or buffer allocation.
576 */
577
578static struct usb_request *
579at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
580{
581 struct at91_request *req;
582
583 req = kzalloc(sizeof (struct at91_request), gfp_flags);
584 if (!req)
585 return NULL;
586
587 INIT_LIST_HEAD(&req->queue);
588 return &req->req;
589}
590
591static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
592{
593 struct at91_request *req;
594
595 req = container_of(_req, struct at91_request, req);
596 BUG_ON(!list_empty(&req->queue));
597 kfree(req);
598}
599
600static int at91_ep_queue(struct usb_ep *_ep,
601 struct usb_request *_req, gfp_t gfp_flags)
602{
603 struct at91_request *req;
604 struct at91_ep *ep;
605 struct at91_udc *udc;
606 int status;
607 unsigned long flags;
608
609 req = container_of(_req, struct at91_request, req);
610 ep = container_of(_ep, struct at91_ep, ep);
611
612 if (!_req || !_req->complete
613 || !_req->buf || !list_empty(&req->queue)) {
614 DBG("invalid request\n");
615 return -EINVAL;
616 }
617
618 if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
619 DBG("invalid ep\n");
620 return -EINVAL;
621 }
622
623 udc = ep->udc;
624
625 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
626 DBG("invalid device\n");
627 return -EINVAL;
628 }
629
630 _req->status = -EINPROGRESS;
631 _req->actual = 0;
632
633 spin_lock_irqsave(&udc->lock, flags);
634
635 /* try to kickstart any empty and idle queue */
636 if (list_empty(&ep->queue) && !ep->stopped) {
637 int is_ep0;
638
639 /*
640 * If this control request has a non-empty DATA stage, this
641 * will start that stage. It works just like a non-control
642 * request (until the status stage starts, maybe early).
643 *
644 * If the data stage is empty, then this starts a successful
645 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
646 */
647 is_ep0 = (ep->ep.name == ep0name);
648 if (is_ep0) {
649 u32 tmp;
650
651 if (!udc->req_pending) {
652 status = -EINVAL;
653 goto done;
654 }
655
656 /*
657 * defer changing CONFG until after the gadget driver
658 * reconfigures the endpoints.
659 */
660 if (udc->wait_for_config_ack) {
661 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
662 tmp ^= AT91_UDP_CONFG;
663 VDBG("toggle config\n");
664 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
665 }
666 if (req->req.length == 0) {
667ep0_in_status:
668 PACKET("ep0 in/status\n");
669 status = 0;
670 tmp = __raw_readl(ep->creg);
671 tmp &= ~SET_FX;
672 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
673 __raw_writel(tmp, ep->creg);
674 udc->req_pending = 0;
675 goto done;
676 }
677 }
678
679 if (ep->is_in)
680 status = write_fifo(ep, req);
681 else {
682 status = read_fifo(ep, req);
683
684 /* IN/STATUS stage is otherwise triggered by irq */
685 if (status && is_ep0)
686 goto ep0_in_status;
687 }
688 } else
689 status = 0;
690
691 if (req && !status) {
692 list_add_tail (&req->queue, &ep->queue);
693 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
694 }
695done:
696 spin_unlock_irqrestore(&udc->lock, flags);
697 return (status < 0) ? status : 0;
698}
699
700static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
701{
702 struct at91_ep *ep;
703 struct at91_request *req;
704 unsigned long flags;
705 struct at91_udc *udc;
706
707 ep = container_of(_ep, struct at91_ep, ep);
708 if (!_ep || ep->ep.name == ep0name)
709 return -EINVAL;
710
711 udc = ep->udc;
712
713 spin_lock_irqsave(&udc->lock, flags);
714
715 /* make sure it's actually queued on this endpoint */
716 list_for_each_entry (req, &ep->queue, queue) {
717 if (&req->req == _req)
718 break;
719 }
720 if (&req->req != _req) {
721 spin_unlock_irqrestore(&udc->lock, flags);
722 return -EINVAL;
723 }
724
725 done(ep, req, -ECONNRESET);
726 spin_unlock_irqrestore(&udc->lock, flags);
727 return 0;
728}
729
730static int at91_ep_set_halt(struct usb_ep *_ep, int value)
731{
732 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
733 struct at91_udc *udc = ep->udc;
734 u32 __iomem *creg;
735 u32 csr;
736 unsigned long flags;
737 int status = 0;
738
739 if (!_ep || ep->is_iso || !ep->udc->clocked)
740 return -EINVAL;
741
742 creg = ep->creg;
743 spin_lock_irqsave(&udc->lock, flags);
744
745 csr = __raw_readl(creg);
746
747 /*
748 * fail with still-busy IN endpoints, ensuring correct sequencing
749 * of data tx then stall. note that the fifo rx bytecount isn't
750 * completely accurate as a tx bytecount.
751 */
752 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
753 status = -EAGAIN;
754 else {
755 csr |= CLR_FX;
756 csr &= ~SET_FX;
757 if (value) {
758 csr |= AT91_UDP_FORCESTALL;
759 VDBG("halt %s\n", ep->ep.name);
760 } else {
761 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
762 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
763 csr &= ~AT91_UDP_FORCESTALL;
764 }
765 __raw_writel(csr, creg);
766 }
767
768 spin_unlock_irqrestore(&udc->lock, flags);
769 return status;
770}
771
772static const struct usb_ep_ops at91_ep_ops = {
773 .enable = at91_ep_enable,
774 .disable = at91_ep_disable,
775 .alloc_request = at91_ep_alloc_request,
776 .free_request = at91_ep_free_request,
777 .queue = at91_ep_queue,
778 .dequeue = at91_ep_dequeue,
779 .set_halt = at91_ep_set_halt,
780 /* there's only imprecise fifo status reporting */
781};
782
783/*-------------------------------------------------------------------------*/
784
785static int at91_get_frame(struct usb_gadget *gadget)
786{
787 struct at91_udc *udc = to_udc(gadget);
788
789 if (!to_udc(gadget)->clocked)
790 return -EINVAL;
791 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
792}
793
794static int at91_wakeup(struct usb_gadget *gadget)
795{
796 struct at91_udc *udc = to_udc(gadget);
797 u32 glbstate;
798 int status = -EINVAL;
799 unsigned long flags;
800
801 DBG("%s\n", __func__ );
802 spin_lock_irqsave(&udc->lock, flags);
803
804 if (!udc->clocked || !udc->suspended)
805 goto done;
806
807 /* NOTE: some "early versions" handle ESR differently ... */
808
809 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
810 if (!(glbstate & AT91_UDP_ESR))
811 goto done;
812 glbstate |= AT91_UDP_ESR;
813 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
814
815done:
816 spin_unlock_irqrestore(&udc->lock, flags);
817 return status;
818}
819
820/* reinit == restore initial software state */
821static void udc_reinit(struct at91_udc *udc)
822{
823 u32 i;
824
825 INIT_LIST_HEAD(&udc->gadget.ep_list);
826 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
827
828 for (i = 0; i < NUM_ENDPOINTS; i++) {
829 struct at91_ep *ep = &udc->ep[i];
830
831 if (i != 0)
832 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
833 ep->ep.desc = NULL;
834 ep->stopped = 0;
835 ep->fifo_bank = 0;
836 ep->ep.maxpacket = ep->maxpacket;
837 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
838 /* initialize one queue per endpoint */
839 INIT_LIST_HEAD(&ep->queue);
840 }
841}
842
843static void stop_activity(struct at91_udc *udc)
844{
845 struct usb_gadget_driver *driver = udc->driver;
846 int i;
847
848 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
849 driver = NULL;
850 udc->gadget.speed = USB_SPEED_UNKNOWN;
851 udc->suspended = 0;
852
853 for (i = 0; i < NUM_ENDPOINTS; i++) {
854 struct at91_ep *ep = &udc->ep[i];
855 ep->stopped = 1;
856 nuke(ep, -ESHUTDOWN);
857 }
858 if (driver) {
859 spin_unlock(&udc->lock);
860 driver->disconnect(&udc->gadget);
861 spin_lock(&udc->lock);
862 }
863
864 udc_reinit(udc);
865}
866
867static void clk_on(struct at91_udc *udc)
868{
869 if (udc->clocked)
870 return;
871 udc->clocked = 1;
872 clk_enable(udc->iclk);
873 clk_enable(udc->fclk);
874}
875
876static void clk_off(struct at91_udc *udc)
877{
878 if (!udc->clocked)
879 return;
880 udc->clocked = 0;
881 udc->gadget.speed = USB_SPEED_UNKNOWN;
882 clk_disable(udc->fclk);
883 clk_disable(udc->iclk);
884}
885
886/*
887 * activate/deactivate link with host; minimize power usage for
888 * inactive links by cutting clocks and transceiver power.
889 */
890static void pullup(struct at91_udc *udc, int is_on)
891{
892 int active = !udc->board.pullup_active_low;
893
894 if (!udc->enabled || !udc->vbus)
895 is_on = 0;
896 DBG("%sactive\n", is_on ? "" : "in");
897
898 if (is_on) {
899 clk_on(udc);
900 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
901 at91_udp_write(udc, AT91_UDP_TXVC, 0);
902 if (cpu_is_at91rm9200())
903 gpio_set_value(udc->board.pullup_pin, active);
904 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
905 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
906
907 txvc |= AT91_UDP_TXVC_PUON;
908 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
909 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
910 u32 usbpucr;
911
912 usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
913 usbpucr |= AT91_MATRIX_USBPUCR_PUON;
914 at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
915 }
916 } else {
917 stop_activity(udc);
918 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
919 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
920 if (cpu_is_at91rm9200())
921 gpio_set_value(udc->board.pullup_pin, !active);
922 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
923 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
924
925 txvc &= ~AT91_UDP_TXVC_PUON;
926 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
927 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
928 u32 usbpucr;
929
930 usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
931 usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
932 at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
933 }
934 clk_off(udc);
935 }
936}
937
938/* vbus is here! turn everything on that's ready */
939static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
940{
941 struct at91_udc *udc = to_udc(gadget);
942 unsigned long flags;
943
944 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
945 spin_lock_irqsave(&udc->lock, flags);
946 udc->vbus = (is_active != 0);
947 if (udc->driver)
948 pullup(udc, is_active);
949 else
950 pullup(udc, 0);
951 spin_unlock_irqrestore(&udc->lock, flags);
952 return 0;
953}
954
955static int at91_pullup(struct usb_gadget *gadget, int is_on)
956{
957 struct at91_udc *udc = to_udc(gadget);
958 unsigned long flags;
959
960 spin_lock_irqsave(&udc->lock, flags);
961 udc->enabled = is_on = !!is_on;
962 pullup(udc, is_on);
963 spin_unlock_irqrestore(&udc->lock, flags);
964 return 0;
965}
966
967static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
968{
969 struct at91_udc *udc = to_udc(gadget);
970 unsigned long flags;
971
972 spin_lock_irqsave(&udc->lock, flags);
973 udc->selfpowered = (is_on != 0);
974 spin_unlock_irqrestore(&udc->lock, flags);
975 return 0;
976}
977
978static int at91_start(struct usb_gadget *gadget,
979 struct usb_gadget_driver *driver);
980static int at91_stop(struct usb_gadget *gadget,
981 struct usb_gadget_driver *driver);
982static const struct usb_gadget_ops at91_udc_ops = {
983 .get_frame = at91_get_frame,
984 .wakeup = at91_wakeup,
985 .set_selfpowered = at91_set_selfpowered,
986 .vbus_session = at91_vbus_session,
987 .pullup = at91_pullup,
988 .udc_start = at91_start,
989 .udc_stop = at91_stop,
990
991 /*
992 * VBUS-powered devices may also also want to support bigger
993 * power budgets after an appropriate SET_CONFIGURATION.
994 */
995 /* .vbus_power = at91_vbus_power, */
996};
997
998/*-------------------------------------------------------------------------*/
999
1000static int handle_ep(struct at91_ep *ep)
1001{
1002 struct at91_request *req;
1003 u32 __iomem *creg = ep->creg;
1004 u32 csr = __raw_readl(creg);
1005
1006 if (!list_empty(&ep->queue))
1007 req = list_entry(ep->queue.next,
1008 struct at91_request, queue);
1009 else
1010 req = NULL;
1011
1012 if (ep->is_in) {
1013 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1014 csr |= CLR_FX;
1015 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1016 __raw_writel(csr, creg);
1017 }
1018 if (req)
1019 return write_fifo(ep, req);
1020
1021 } else {
1022 if (csr & AT91_UDP_STALLSENT) {
1023 /* STALLSENT bit == ISOERR */
1024 if (ep->is_iso && req)
1025 req->req.status = -EILSEQ;
1026 csr |= CLR_FX;
1027 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1028 __raw_writel(csr, creg);
1029 csr = __raw_readl(creg);
1030 }
1031 if (req && (csr & RX_DATA_READY))
1032 return read_fifo(ep, req);
1033 }
1034 return 0;
1035}
1036
1037union setup {
1038 u8 raw[8];
1039 struct usb_ctrlrequest r;
1040};
1041
1042static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1043{
1044 u32 __iomem *creg = ep->creg;
1045 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1046 unsigned rxcount, i = 0;
1047 u32 tmp;
1048 union setup pkt;
1049 int status = 0;
1050
1051 /* read and ack SETUP; hard-fail for bogus packets */
1052 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1053 if (likely(rxcount == 8)) {
1054 while (rxcount--)
1055 pkt.raw[i++] = __raw_readb(dreg);
1056 if (pkt.r.bRequestType & USB_DIR_IN) {
1057 csr |= AT91_UDP_DIR;
1058 ep->is_in = 1;
1059 } else {
1060 csr &= ~AT91_UDP_DIR;
1061 ep->is_in = 0;
1062 }
1063 } else {
1064 /* REVISIT this happens sometimes under load; why?? */
1065 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1066 status = -EINVAL;
1067 }
1068 csr |= CLR_FX;
1069 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1070 __raw_writel(csr, creg);
1071 udc->wait_for_addr_ack = 0;
1072 udc->wait_for_config_ack = 0;
1073 ep->stopped = 0;
1074 if (unlikely(status != 0))
1075 goto stall;
1076
1077#define w_index le16_to_cpu(pkt.r.wIndex)
1078#define w_value le16_to_cpu(pkt.r.wValue)
1079#define w_length le16_to_cpu(pkt.r.wLength)
1080
1081 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1082 pkt.r.bRequestType, pkt.r.bRequest,
1083 w_value, w_index, w_length);
1084
1085 /*
1086 * A few standard requests get handled here, ones that touch
1087 * hardware ... notably for device and endpoint features.
1088 */
1089 udc->req_pending = 1;
1090 csr = __raw_readl(creg);
1091 csr |= CLR_FX;
1092 csr &= ~SET_FX;
1093 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1094
1095 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1096 | USB_REQ_SET_ADDRESS:
1097 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1098 udc->addr = w_value;
1099 udc->wait_for_addr_ack = 1;
1100 udc->req_pending = 0;
1101 /* FADDR is set later, when we ack host STATUS */
1102 return;
1103
1104 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1105 | USB_REQ_SET_CONFIGURATION:
1106 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1107 if (pkt.r.wValue)
1108 udc->wait_for_config_ack = (tmp == 0);
1109 else
1110 udc->wait_for_config_ack = (tmp != 0);
1111 if (udc->wait_for_config_ack)
1112 VDBG("wait for config\n");
1113 /* CONFG is toggled later, if gadget driver succeeds */
1114 break;
1115
1116 /*
1117 * Hosts may set or clear remote wakeup status, and
1118 * devices may report they're VBUS powered.
1119 */
1120 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1121 | USB_REQ_GET_STATUS:
1122 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1123 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1124 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1125 PACKET("get device status\n");
1126 __raw_writeb(tmp, dreg);
1127 __raw_writeb(0, dreg);
1128 goto write_in;
1129 /* then STATUS starts later, automatically */
1130 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1131 | USB_REQ_SET_FEATURE:
1132 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1133 goto stall;
1134 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1135 tmp |= AT91_UDP_ESR;
1136 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1137 goto succeed;
1138 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1139 | USB_REQ_CLEAR_FEATURE:
1140 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1141 goto stall;
1142 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1143 tmp &= ~AT91_UDP_ESR;
1144 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1145 goto succeed;
1146
1147 /*
1148 * Interfaces have no feature settings; this is pretty useless.
1149 * we won't even insist the interface exists...
1150 */
1151 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1152 | USB_REQ_GET_STATUS:
1153 PACKET("get interface status\n");
1154 __raw_writeb(0, dreg);
1155 __raw_writeb(0, dreg);
1156 goto write_in;
1157 /* then STATUS starts later, automatically */
1158 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1159 | USB_REQ_SET_FEATURE:
1160 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1161 | USB_REQ_CLEAR_FEATURE:
1162 goto stall;
1163
1164 /*
1165 * Hosts may clear bulk/intr endpoint halt after the gadget
1166 * driver sets it (not widely used); or set it (for testing)
1167 */
1168 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1169 | USB_REQ_GET_STATUS:
1170 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1171 ep = &udc->ep[tmp];
1172 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1173 goto stall;
1174
1175 if (tmp) {
1176 if ((w_index & USB_DIR_IN)) {
1177 if (!ep->is_in)
1178 goto stall;
1179 } else if (ep->is_in)
1180 goto stall;
1181 }
1182 PACKET("get %s status\n", ep->ep.name);
1183 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1184 tmp = (1 << USB_ENDPOINT_HALT);
1185 else
1186 tmp = 0;
1187 __raw_writeb(tmp, dreg);
1188 __raw_writeb(0, dreg);
1189 goto write_in;
1190 /* then STATUS starts later, automatically */
1191 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1192 | USB_REQ_SET_FEATURE:
1193 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1194 ep = &udc->ep[tmp];
1195 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1196 goto stall;
1197 if (!ep->ep.desc || ep->is_iso)
1198 goto stall;
1199 if ((w_index & USB_DIR_IN)) {
1200 if (!ep->is_in)
1201 goto stall;
1202 } else if (ep->is_in)
1203 goto stall;
1204
1205 tmp = __raw_readl(ep->creg);
1206 tmp &= ~SET_FX;
1207 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1208 __raw_writel(tmp, ep->creg);
1209 goto succeed;
1210 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1211 | USB_REQ_CLEAR_FEATURE:
1212 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1213 ep = &udc->ep[tmp];
1214 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1215 goto stall;
1216 if (tmp == 0)
1217 goto succeed;
1218 if (!ep->ep.desc || ep->is_iso)
1219 goto stall;
1220 if ((w_index & USB_DIR_IN)) {
1221 if (!ep->is_in)
1222 goto stall;
1223 } else if (ep->is_in)
1224 goto stall;
1225
1226 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1227 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1228 tmp = __raw_readl(ep->creg);
1229 tmp |= CLR_FX;
1230 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1231 __raw_writel(tmp, ep->creg);
1232 if (!list_empty(&ep->queue))
1233 handle_ep(ep);
1234 goto succeed;
1235 }
1236
1237#undef w_value
1238#undef w_index
1239#undef w_length
1240
1241 /* pass request up to the gadget driver */
1242 if (udc->driver) {
1243 spin_unlock(&udc->lock);
1244 status = udc->driver->setup(&udc->gadget, &pkt.r);
1245 spin_lock(&udc->lock);
1246 }
1247 else
1248 status = -ENODEV;
1249 if (status < 0) {
1250stall:
1251 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1252 pkt.r.bRequestType, pkt.r.bRequest, status);
1253 csr |= AT91_UDP_FORCESTALL;
1254 __raw_writel(csr, creg);
1255 udc->req_pending = 0;
1256 }
1257 return;
1258
1259succeed:
1260 /* immediate successful (IN) STATUS after zero length DATA */
1261 PACKET("ep0 in/status\n");
1262write_in:
1263 csr |= AT91_UDP_TXPKTRDY;
1264 __raw_writel(csr, creg);
1265 udc->req_pending = 0;
1266}
1267
1268static void handle_ep0(struct at91_udc *udc)
1269{
1270 struct at91_ep *ep0 = &udc->ep[0];
1271 u32 __iomem *creg = ep0->creg;
1272 u32 csr = __raw_readl(creg);
1273 struct at91_request *req;
1274
1275 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1276 nuke(ep0, -EPROTO);
1277 udc->req_pending = 0;
1278 csr |= CLR_FX;
1279 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1280 __raw_writel(csr, creg);
1281 VDBG("ep0 stalled\n");
1282 csr = __raw_readl(creg);
1283 }
1284 if (csr & AT91_UDP_RXSETUP) {
1285 nuke(ep0, 0);
1286 udc->req_pending = 0;
1287 handle_setup(udc, ep0, csr);
1288 return;
1289 }
1290
1291 if (list_empty(&ep0->queue))
1292 req = NULL;
1293 else
1294 req = list_entry(ep0->queue.next, struct at91_request, queue);
1295
1296 /* host ACKed an IN packet that we sent */
1297 if (csr & AT91_UDP_TXCOMP) {
1298 csr |= CLR_FX;
1299 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1300
1301 /* write more IN DATA? */
1302 if (req && ep0->is_in) {
1303 if (handle_ep(ep0))
1304 udc->req_pending = 0;
1305
1306 /*
1307 * Ack after:
1308 * - last IN DATA packet (including GET_STATUS)
1309 * - IN/STATUS for OUT DATA
1310 * - IN/STATUS for any zero-length DATA stage
1311 * except for the IN DATA case, the host should send
1312 * an OUT status later, which we'll ack.
1313 */
1314 } else {
1315 udc->req_pending = 0;
1316 __raw_writel(csr, creg);
1317
1318 /*
1319 * SET_ADDRESS takes effect only after the STATUS
1320 * (to the original address) gets acked.
1321 */
1322 if (udc->wait_for_addr_ack) {
1323 u32 tmp;
1324
1325 at91_udp_write(udc, AT91_UDP_FADDR,
1326 AT91_UDP_FEN | udc->addr);
1327 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1328 tmp &= ~AT91_UDP_FADDEN;
1329 if (udc->addr)
1330 tmp |= AT91_UDP_FADDEN;
1331 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1332
1333 udc->wait_for_addr_ack = 0;
1334 VDBG("address %d\n", udc->addr);
1335 }
1336 }
1337 }
1338
1339 /* OUT packet arrived ... */
1340 else if (csr & AT91_UDP_RX_DATA_BK0) {
1341 csr |= CLR_FX;
1342 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1343
1344 /* OUT DATA stage */
1345 if (!ep0->is_in) {
1346 if (req) {
1347 if (handle_ep(ep0)) {
1348 /* send IN/STATUS */
1349 PACKET("ep0 in/status\n");
1350 csr = __raw_readl(creg);
1351 csr &= ~SET_FX;
1352 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1353 __raw_writel(csr, creg);
1354 udc->req_pending = 0;
1355 }
1356 } else if (udc->req_pending) {
1357 /*
1358 * AT91 hardware has a hard time with this
1359 * "deferred response" mode for control-OUT
1360 * transfers. (For control-IN it's fine.)
1361 *
1362 * The normal solution leaves OUT data in the
1363 * fifo until the gadget driver is ready.
1364 * We couldn't do that here without disabling
1365 * the IRQ that tells about SETUP packets,
1366 * e.g. when the host gets impatient...
1367 *
1368 * Working around it by copying into a buffer
1369 * would almost be a non-deferred response,
1370 * except that it wouldn't permit reliable
1371 * stalling of the request. Instead, demand
1372 * that gadget drivers not use this mode.
1373 */
1374 DBG("no control-OUT deferred responses!\n");
1375 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1376 udc->req_pending = 0;
1377 }
1378
1379 /* STATUS stage for control-IN; ack. */
1380 } else {
1381 PACKET("ep0 out/status ACK\n");
1382 __raw_writel(csr, creg);
1383
1384 /* "early" status stage */
1385 if (req)
1386 done(ep0, req, 0);
1387 }
1388 }
1389}
1390
1391static irqreturn_t at91_udc_irq (int irq, void *_udc)
1392{
1393 struct at91_udc *udc = _udc;
1394 u32 rescans = 5;
1395 int disable_clock = 0;
1396 unsigned long flags;
1397
1398 spin_lock_irqsave(&udc->lock, flags);
1399
1400 if (!udc->clocked) {
1401 clk_on(udc);
1402 disable_clock = 1;
1403 }
1404
1405 while (rescans--) {
1406 u32 status;
1407
1408 status = at91_udp_read(udc, AT91_UDP_ISR)
1409 & at91_udp_read(udc, AT91_UDP_IMR);
1410 if (!status)
1411 break;
1412
1413 /* USB reset irq: not maskable */
1414 if (status & AT91_UDP_ENDBUSRES) {
1415 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1416 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1417 /* Atmel code clears this irq twice */
1418 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1419 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1420 VDBG("end bus reset\n");
1421 udc->addr = 0;
1422 stop_activity(udc);
1423
1424 /* enable ep0 */
1425 at91_udp_write(udc, AT91_UDP_CSR(0),
1426 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1427 udc->gadget.speed = USB_SPEED_FULL;
1428 udc->suspended = 0;
1429 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1430
1431 /*
1432 * NOTE: this driver keeps clocks off unless the
1433 * USB host is present. That saves power, but for
1434 * boards that don't support VBUS detection, both
1435 * clocks need to be active most of the time.
1436 */
1437
1438 /* host initiated suspend (3+ms bus idle) */
1439 } else if (status & AT91_UDP_RXSUSP) {
1440 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1441 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1442 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1443 /* VDBG("bus suspend\n"); */
1444 if (udc->suspended)
1445 continue;
1446 udc->suspended = 1;
1447
1448 /*
1449 * NOTE: when suspending a VBUS-powered device, the
1450 * gadget driver should switch into slow clock mode
1451 * and then into standby to avoid drawing more than
1452 * 500uA power (2500uA for some high-power configs).
1453 */
1454 if (udc->driver && udc->driver->suspend) {
1455 spin_unlock(&udc->lock);
1456 udc->driver->suspend(&udc->gadget);
1457 spin_lock(&udc->lock);
1458 }
1459
1460 /* host initiated resume */
1461 } else if (status & AT91_UDP_RXRSM) {
1462 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1463 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1464 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1465 /* VDBG("bus resume\n"); */
1466 if (!udc->suspended)
1467 continue;
1468 udc->suspended = 0;
1469
1470 /*
1471 * NOTE: for a VBUS-powered device, the gadget driver
1472 * would normally want to switch out of slow clock
1473 * mode into normal mode.
1474 */
1475 if (udc->driver && udc->driver->resume) {
1476 spin_unlock(&udc->lock);
1477 udc->driver->resume(&udc->gadget);
1478 spin_lock(&udc->lock);
1479 }
1480
1481 /* endpoint IRQs are cleared by handling them */
1482 } else {
1483 int i;
1484 unsigned mask = 1;
1485 struct at91_ep *ep = &udc->ep[1];
1486
1487 if (status & mask)
1488 handle_ep0(udc);
1489 for (i = 1; i < NUM_ENDPOINTS; i++) {
1490 mask <<= 1;
1491 if (status & mask)
1492 handle_ep(ep);
1493 ep++;
1494 }
1495 }
1496 }
1497
1498 if (disable_clock)
1499 clk_off(udc);
1500
1501 spin_unlock_irqrestore(&udc->lock, flags);
1502
1503 return IRQ_HANDLED;
1504}
1505
1506/*-------------------------------------------------------------------------*/
1507
1508static void nop_release(struct device *dev)
1509{
1510 /* nothing to free */
1511}
1512
1513static struct at91_udc controller = {
1514 .gadget = {
1515 .ops = &at91_udc_ops,
1516 .ep0 = &controller.ep[0].ep,
1517 .name = driver_name,
1518 .dev = {
1519 .init_name = "gadget",
1520 .release = nop_release,
1521 }
1522 },
1523 .ep[0] = {
1524 .ep = {
1525 .name = ep0name,
1526 .ops = &at91_ep_ops,
1527 },
1528 .udc = &controller,
1529 .maxpacket = 8,
1530 .int_mask = 1 << 0,
1531 },
1532 .ep[1] = {
1533 .ep = {
1534 .name = "ep1",
1535 .ops = &at91_ep_ops,
1536 },
1537 .udc = &controller,
1538 .is_pingpong = 1,
1539 .maxpacket = 64,
1540 .int_mask = 1 << 1,
1541 },
1542 .ep[2] = {
1543 .ep = {
1544 .name = "ep2",
1545 .ops = &at91_ep_ops,
1546 },
1547 .udc = &controller,
1548 .is_pingpong = 1,
1549 .maxpacket = 64,
1550 .int_mask = 1 << 2,
1551 },
1552 .ep[3] = {
1553 .ep = {
1554 /* could actually do bulk too */
1555 .name = "ep3-int",
1556 .ops = &at91_ep_ops,
1557 },
1558 .udc = &controller,
1559 .maxpacket = 8,
1560 .int_mask = 1 << 3,
1561 },
1562 .ep[4] = {
1563 .ep = {
1564 .name = "ep4",
1565 .ops = &at91_ep_ops,
1566 },
1567 .udc = &controller,
1568 .is_pingpong = 1,
1569 .maxpacket = 256,
1570 .int_mask = 1 << 4,
1571 },
1572 .ep[5] = {
1573 .ep = {
1574 .name = "ep5",
1575 .ops = &at91_ep_ops,
1576 },
1577 .udc = &controller,
1578 .is_pingpong = 1,
1579 .maxpacket = 256,
1580 .int_mask = 1 << 5,
1581 },
1582 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1583};
1584
1585static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1586{
1587 value ^= udc->board.vbus_active_low;
1588 if (value != udc->vbus)
1589 at91_vbus_session(&udc->gadget, value);
1590}
1591
1592static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1593{
1594 struct at91_udc *udc = _udc;
1595
1596 /* vbus needs at least brief debouncing */
1597 udelay(10);
1598 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1599
1600 return IRQ_HANDLED;
1601}
1602
1603static void at91_vbus_timer_work(struct work_struct *work)
1604{
1605 struct at91_udc *udc = container_of(work, struct at91_udc,
1606 vbus_timer_work);
1607
1608 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1609
1610 if (!timer_pending(&udc->vbus_timer))
1611 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1612}
1613
1614static void at91_vbus_timer(unsigned long data)
1615{
1616 struct at91_udc *udc = (struct at91_udc *)data;
1617
1618 /*
1619 * If we are polling vbus it is likely that the gpio is on an
1620 * bus such as i2c or spi which may sleep, so schedule some work
1621 * to read the vbus gpio
1622 */
1623 if (!work_pending(&udc->vbus_timer_work))
1624 schedule_work(&udc->vbus_timer_work);
1625}
1626
1627static int at91_start(struct usb_gadget *gadget,
1628 struct usb_gadget_driver *driver)
1629{
1630 struct at91_udc *udc;
1631
1632 udc = container_of(gadget, struct at91_udc, gadget);
1633 udc->driver = driver;
1634 udc->gadget.dev.driver = &driver->driver;
1635 udc->enabled = 1;
1636 udc->selfpowered = 1;
1637
1638 DBG("bound to %s\n", driver->driver.name);
1639 return 0;
1640}
1641
1642static int at91_stop(struct usb_gadget *gadget,
1643 struct usb_gadget_driver *driver)
1644{
1645 struct at91_udc *udc;
1646 unsigned long flags;
1647
1648 udc = container_of(gadget, struct at91_udc, gadget);
1649 spin_lock_irqsave(&udc->lock, flags);
1650 udc->enabled = 0;
1651 at91_udp_write(udc, AT91_UDP_IDR, ~0);
1652 spin_unlock_irqrestore(&udc->lock, flags);
1653
1654 udc->gadget.dev.driver = NULL;
1655 udc->driver = NULL;
1656
1657 DBG("unbound from %s\n", driver->driver.name);
1658 return 0;
1659}
1660
1661/*-------------------------------------------------------------------------*/
1662
1663static void at91udc_shutdown(struct platform_device *dev)
1664{
1665 struct at91_udc *udc = platform_get_drvdata(dev);
1666 unsigned long flags;
1667
1668 /* force disconnect on reboot */
1669 spin_lock_irqsave(&udc->lock, flags);
1670 pullup(platform_get_drvdata(dev), 0);
1671 spin_unlock_irqrestore(&udc->lock, flags);
1672}
1673
1674static void __devinit at91udc_of_init(struct at91_udc *udc,
1675 struct device_node *np)
1676{
1677 struct at91_udc_data *board = &udc->board;
1678 u32 val;
1679 enum of_gpio_flags flags;
1680
1681 if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
1682 board->vbus_polled = 1;
1683
1684 board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1685 &flags);
1686 board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1687
1688 board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
1689 &flags);
1690
1691 board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1692}
1693
1694static int __devinit at91udc_probe(struct platform_device *pdev)
1695{
1696 struct device *dev = &pdev->dev;
1697 struct at91_udc *udc;
1698 int retval;
1699 struct resource *res;
1700
1701 if (!dev->platform_data) {
1702 /* small (so we copy it) but critical! */
1703 DBG("missing platform_data\n");
1704 return -ENODEV;
1705 }
1706
1707 if (pdev->num_resources != 2) {
1708 DBG("invalid num_resources\n");
1709 return -ENODEV;
1710 }
1711 if ((pdev->resource[0].flags != IORESOURCE_MEM)
1712 || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1713 DBG("invalid resource type\n");
1714 return -ENODEV;
1715 }
1716
1717 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1718 if (!res)
1719 return -ENXIO;
1720
1721 if (!request_mem_region(res->start, resource_size(res), driver_name)) {
1722 DBG("someone's using UDC memory\n");
1723 return -EBUSY;
1724 }
1725
1726 /* init software state */
1727 udc = &controller;
1728 udc->gadget.dev.parent = dev;
1729 if (pdev->dev.of_node)
1730 at91udc_of_init(udc, pdev->dev.of_node);
1731 else
1732 memcpy(&udc->board, dev->platform_data,
1733 sizeof(struct at91_udc_data));
1734 udc->pdev = pdev;
1735 udc->enabled = 0;
1736 spin_lock_init(&udc->lock);
1737
1738 /* rm9200 needs manual D+ pullup; off by default */
1739 if (cpu_is_at91rm9200()) {
1740 if (gpio_is_valid(udc->board.pullup_pin)) {
1741 DBG("no D+ pullup?\n");
1742 retval = -ENODEV;
1743 goto fail0;
1744 }
1745 retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
1746 if (retval) {
1747 DBG("D+ pullup is busy\n");
1748 goto fail0;
1749 }
1750 gpio_direction_output(udc->board.pullup_pin,
1751 udc->board.pullup_active_low);
1752 }
1753
1754 /* newer chips have more FIFO memory than rm9200 */
1755 if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
1756 udc->ep[0].maxpacket = 64;
1757 udc->ep[3].maxpacket = 64;
1758 udc->ep[4].maxpacket = 512;
1759 udc->ep[5].maxpacket = 512;
1760 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1761 udc->ep[3].maxpacket = 64;
1762 } else if (cpu_is_at91sam9263()) {
1763 udc->ep[0].maxpacket = 64;
1764 udc->ep[3].maxpacket = 64;
1765 }
1766
1767 udc->udp_baseaddr = ioremap(res->start, resource_size(res));
1768 if (!udc->udp_baseaddr) {
1769 retval = -ENOMEM;
1770 goto fail0a;
1771 }
1772
1773 udc_reinit(udc);
1774
1775 /* get interface and function clocks */
1776 udc->iclk = clk_get(dev, "udc_clk");
1777 udc->fclk = clk_get(dev, "udpck");
1778 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
1779 DBG("clocks missing\n");
1780 retval = -ENODEV;
1781 /* NOTE: we "know" here that refcounts on these are NOPs */
1782 goto fail0b;
1783 }
1784
1785 retval = device_register(&udc->gadget.dev);
1786 if (retval < 0) {
1787 put_device(&udc->gadget.dev);
1788 goto fail0b;
1789 }
1790
1791 /* don't do anything until we have both gadget driver and VBUS */
1792 clk_enable(udc->iclk);
1793 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1794 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1795 /* Clear all pending interrupts - UDP may be used by bootloader. */
1796 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1797 clk_disable(udc->iclk);
1798
1799 /* request UDC and maybe VBUS irqs */
1800 udc->udp_irq = platform_get_irq(pdev, 0);
1801 retval = request_irq(udc->udp_irq, at91_udc_irq,
1802 0, driver_name, udc);
1803 if (retval < 0) {
1804 DBG("request irq %d failed\n", udc->udp_irq);
1805 goto fail1;
1806 }
1807 if (gpio_is_valid(udc->board.vbus_pin)) {
1808 retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
1809 if (retval < 0) {
1810 DBG("request vbus pin failed\n");
1811 goto fail2;
1812 }
1813 gpio_direction_input(udc->board.vbus_pin);
1814
1815 /*
1816 * Get the initial state of VBUS - we cannot expect
1817 * a pending interrupt.
1818 */
1819 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1820 udc->board.vbus_active_low;
1821
1822 if (udc->board.vbus_polled) {
1823 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1824 setup_timer(&udc->vbus_timer, at91_vbus_timer,
1825 (unsigned long)udc);
1826 mod_timer(&udc->vbus_timer,
1827 jiffies + VBUS_POLL_TIMEOUT);
1828 } else {
1829 if (request_irq(gpio_to_irq(udc->board.vbus_pin),
1830 at91_vbus_irq, 0, driver_name, udc)) {
1831 DBG("request vbus irq %d failed\n",
1832 udc->board.vbus_pin);
1833 retval = -EBUSY;
1834 goto fail3;
1835 }
1836 }
1837 } else {
1838 DBG("no VBUS detection, assuming always-on\n");
1839 udc->vbus = 1;
1840 }
1841 retval = usb_add_gadget_udc(dev, &udc->gadget);
1842 if (retval)
1843 goto fail4;
1844 dev_set_drvdata(dev, udc);
1845 device_init_wakeup(dev, 1);
1846 create_debug_file(udc);
1847
1848 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1849 return 0;
1850fail4:
1851 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled)
1852 free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
1853fail3:
1854 if (gpio_is_valid(udc->board.vbus_pin))
1855 gpio_free(udc->board.vbus_pin);
1856fail2:
1857 free_irq(udc->udp_irq, udc);
1858fail1:
1859 device_unregister(&udc->gadget.dev);
1860fail0b:
1861 iounmap(udc->udp_baseaddr);
1862fail0a:
1863 if (cpu_is_at91rm9200())
1864 gpio_free(udc->board.pullup_pin);
1865fail0:
1866 release_mem_region(res->start, resource_size(res));
1867 DBG("%s probe failed, %d\n", driver_name, retval);
1868 return retval;
1869}
1870
1871static int __exit at91udc_remove(struct platform_device *pdev)
1872{
1873 struct at91_udc *udc = platform_get_drvdata(pdev);
1874 struct resource *res;
1875 unsigned long flags;
1876
1877 DBG("remove\n");
1878
1879 usb_del_gadget_udc(&udc->gadget);
1880 if (udc->driver)
1881 return -EBUSY;
1882
1883 spin_lock_irqsave(&udc->lock, flags);
1884 pullup(udc, 0);
1885 spin_unlock_irqrestore(&udc->lock, flags);
1886
1887 device_init_wakeup(&pdev->dev, 0);
1888 remove_debug_file(udc);
1889 if (gpio_is_valid(udc->board.vbus_pin)) {
1890 free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
1891 gpio_free(udc->board.vbus_pin);
1892 }
1893 free_irq(udc->udp_irq, udc);
1894 device_unregister(&udc->gadget.dev);
1895
1896 iounmap(udc->udp_baseaddr);
1897
1898 if (cpu_is_at91rm9200())
1899 gpio_free(udc->board.pullup_pin);
1900
1901 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1902 release_mem_region(res->start, resource_size(res));
1903
1904 clk_put(udc->iclk);
1905 clk_put(udc->fclk);
1906
1907 return 0;
1908}
1909
1910#ifdef CONFIG_PM
1911static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1912{
1913 struct at91_udc *udc = platform_get_drvdata(pdev);
1914 int wake = udc->driver && device_may_wakeup(&pdev->dev);
1915 unsigned long flags;
1916
1917 /* Unless we can act normally to the host (letting it wake us up
1918 * whenever it has work for us) force disconnect. Wakeup requires
1919 * PLLB for USB events (signaling for reset, wakeup, or incoming
1920 * tokens) and VBUS irqs (on systems which support them).
1921 */
1922 if ((!udc->suspended && udc->addr)
1923 || !wake
1924 || at91_suspend_entering_slow_clock()) {
1925 spin_lock_irqsave(&udc->lock, flags);
1926 pullup(udc, 0);
1927 wake = 0;
1928 spin_unlock_irqrestore(&udc->lock, flags);
1929 } else
1930 enable_irq_wake(udc->udp_irq);
1931
1932 udc->active_suspend = wake;
1933 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
1934 enable_irq_wake(udc->board.vbus_pin);
1935 return 0;
1936}
1937
1938static int at91udc_resume(struct platform_device *pdev)
1939{
1940 struct at91_udc *udc = platform_get_drvdata(pdev);
1941 unsigned long flags;
1942
1943 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
1944 udc->active_suspend)
1945 disable_irq_wake(udc->board.vbus_pin);
1946
1947 /* maybe reconnect to host; if so, clocks on */
1948 if (udc->active_suspend)
1949 disable_irq_wake(udc->udp_irq);
1950 else {
1951 spin_lock_irqsave(&udc->lock, flags);
1952 pullup(udc, 1);
1953 spin_unlock_irqrestore(&udc->lock, flags);
1954 }
1955 return 0;
1956}
1957#else
1958#define at91udc_suspend NULL
1959#define at91udc_resume NULL
1960#endif
1961
1962#if defined(CONFIG_OF)
1963static const struct of_device_id at91_udc_dt_ids[] = {
1964 { .compatible = "atmel,at91rm9200-udc" },
1965 { /* sentinel */ }
1966};
1967
1968MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
1969#endif
1970
1971static struct platform_driver at91_udc_driver = {
1972 .remove = __exit_p(at91udc_remove),
1973 .shutdown = at91udc_shutdown,
1974 .suspend = at91udc_suspend,
1975 .resume = at91udc_resume,
1976 .driver = {
1977 .name = (char *) driver_name,
1978 .owner = THIS_MODULE,
1979 .of_match_table = of_match_ptr(at91_udc_dt_ids),
1980 },
1981};
1982
1983static int __init udc_init_module(void)
1984{
1985 return platform_driver_probe(&at91_udc_driver, at91udc_probe);
1986}
1987module_init(udc_init_module);
1988
1989static void __exit udc_exit_module(void)
1990{
1991 platform_driver_unregister(&at91_udc_driver);
1992}
1993module_exit(udc_exit_module);
1994
1995MODULE_DESCRIPTION("AT91 udc driver");
1996MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1997MODULE_LICENSE("GPL");
1998MODULE_ALIAS("platform:at91_udc");