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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 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
22 */
23
24#undef VERBOSE_DEBUG
25#undef PACKET_TRACE
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/platform_device.h>
30#include <linux/delay.h>
31#include <linux/ioport.h>
32#include <linux/slab.h>
33#include <linux/errno.h>
34#include <linux/init.h>
35#include <linux/list.h>
36#include <linux/interrupt.h>
37#include <linux/proc_fs.h>
38#include <linux/prefetch.h>
39#include <linux/clk.h>
40#include <linux/usb/ch9.h>
41#include <linux/usb/gadget.h>
42#include <linux/prefetch.h>
43
44#include <asm/byteorder.h>
45#include <mach/hardware.h>
46#include <asm/io.h>
47#include <asm/irq.h>
48#include <asm/system.h>
49#include <asm/gpio.h>
50
51#include <mach/board.h>
52#include <mach/cpu.h>
53#include <mach/at91sam9261_matrix.h>
54
55#include "at91_udc.h"
56
57
58/*
59 * This controller is simple and PIO-only. It's used in many AT91-series
60 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
61 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
62 *
63 * This driver expects the board has been wired with two GPIOs suppporting
64 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
65 * testing hasn't covered such cases.)
66 *
67 * The pullup is most important (so it's integrated on sam926x parts). It
68 * provides software control over whether the host enumerates the device.
69 *
70 * The VBUS sensing helps during enumeration, and allows both USB clocks
71 * (and the transceiver) to stay gated off until they're necessary, saving
72 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
73 * it may also be gated off by software during some Linux sleep states.
74 */
75
76#define DRIVER_VERSION "3 May 2006"
77
78static const char driver_name [] = "at91_udc";
79static const char ep0name[] = "ep0";
80
81#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
82
83#define at91_udp_read(udc, reg) \
84 __raw_readl((udc)->udp_baseaddr + (reg))
85#define at91_udp_write(udc, reg, val) \
86 __raw_writel((val), (udc)->udp_baseaddr + (reg))
87
88/*-------------------------------------------------------------------------*/
89
90#ifdef CONFIG_USB_GADGET_DEBUG_FILES
91
92#include <linux/seq_file.h>
93
94static const char debug_filename[] = "driver/udc";
95
96#define FOURBITS "%s%s%s%s"
97#define EIGHTBITS FOURBITS FOURBITS
98
99static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
100{
101 static char *types[] = {
102 "control", "out-iso", "out-bulk", "out-int",
103 "BOGUS", "in-iso", "in-bulk", "in-int"};
104
105 u32 csr;
106 struct at91_request *req;
107 unsigned long flags;
108 struct at91_udc *udc = ep->udc;
109
110 spin_lock_irqsave(&udc->lock, flags);
111
112 csr = __raw_readl(ep->creg);
113
114 /* NOTE: not collecting per-endpoint irq statistics... */
115
116 seq_printf(s, "\n");
117 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
118 ep->ep.name, ep->ep.maxpacket,
119 ep->is_in ? "in" : "out",
120 ep->is_iso ? " iso" : "",
121 ep->is_pingpong
122 ? (ep->fifo_bank ? "pong" : "ping")
123 : "",
124 ep->stopped ? " stopped" : "");
125 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
126 csr,
127 (csr & 0x07ff0000) >> 16,
128 (csr & (1 << 15)) ? "enabled" : "disabled",
129 (csr & (1 << 11)) ? "DATA1" : "DATA0",
130 types[(csr & 0x700) >> 8],
131
132 /* iff type is control then print current direction */
133 (!(csr & 0x700))
134 ? ((csr & (1 << 7)) ? " IN" : " OUT")
135 : "",
136 (csr & (1 << 6)) ? " rxdatabk1" : "",
137 (csr & (1 << 5)) ? " forcestall" : "",
138 (csr & (1 << 4)) ? " txpktrdy" : "",
139
140 (csr & (1 << 3)) ? " stallsent" : "",
141 (csr & (1 << 2)) ? " rxsetup" : "",
142 (csr & (1 << 1)) ? " rxdatabk0" : "",
143 (csr & (1 << 0)) ? " txcomp" : "");
144 if (list_empty (&ep->queue))
145 seq_printf(s, "\t(queue empty)\n");
146
147 else list_for_each_entry (req, &ep->queue, queue) {
148 unsigned length = req->req.actual;
149
150 seq_printf(s, "\treq %p len %d/%d buf %p\n",
151 &req->req, length,
152 req->req.length, req->req.buf);
153 }
154 spin_unlock_irqrestore(&udc->lock, flags);
155}
156
157static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
158{
159 int i;
160
161 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
162 (mask & (1 << 13)) ? " wakeup" : "",
163 (mask & (1 << 12)) ? " endbusres" : "",
164
165 (mask & (1 << 11)) ? " sofint" : "",
166 (mask & (1 << 10)) ? " extrsm" : "",
167 (mask & (1 << 9)) ? " rxrsm" : "",
168 (mask & (1 << 8)) ? " rxsusp" : "");
169 for (i = 0; i < 8; i++) {
170 if (mask & (1 << i))
171 seq_printf(s, " ep%d", i);
172 }
173 seq_printf(s, "\n");
174}
175
176static int proc_udc_show(struct seq_file *s, void *unused)
177{
178 struct at91_udc *udc = s->private;
179 struct at91_ep *ep;
180 u32 tmp;
181
182 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
183
184 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
185 udc->vbus ? "present" : "off",
186 udc->enabled
187 ? (udc->vbus ? "active" : "enabled")
188 : "disabled",
189 udc->selfpowered ? "self" : "VBUS",
190 udc->suspended ? ", suspended" : "",
191 udc->driver ? udc->driver->driver.name : "(none)");
192
193 /* don't access registers when interface isn't clocked */
194 if (!udc->clocked) {
195 seq_printf(s, "(not clocked)\n");
196 return 0;
197 }
198
199 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
200 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
201 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
202 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
203 (tmp & AT91_UDP_NUM));
204
205 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
206 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
207 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
208 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
209 (tmp & AT91_UDP_ESR) ? " esr" : "",
210 (tmp & AT91_UDP_CONFG) ? " confg" : "",
211 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
212
213 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
214 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
215 (tmp & AT91_UDP_FEN) ? " fen" : "",
216 (tmp & AT91_UDP_FADD));
217
218 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
219 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
220
221 if (udc->enabled && udc->vbus) {
222 proc_ep_show(s, &udc->ep[0]);
223 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
224 if (ep->desc)
225 proc_ep_show(s, ep);
226 }
227 }
228 return 0;
229}
230
231static int proc_udc_open(struct inode *inode, struct file *file)
232{
233 return single_open(file, proc_udc_show, PDE(inode)->data);
234}
235
236static const struct file_operations proc_ops = {
237 .owner = THIS_MODULE,
238 .open = proc_udc_open,
239 .read = seq_read,
240 .llseek = seq_lseek,
241 .release = single_release,
242};
243
244static void create_debug_file(struct at91_udc *udc)
245{
246 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
247}
248
249static void remove_debug_file(struct at91_udc *udc)
250{
251 if (udc->pde)
252 remove_proc_entry(debug_filename, NULL);
253}
254
255#else
256
257static inline void create_debug_file(struct at91_udc *udc) {}
258static inline void remove_debug_file(struct at91_udc *udc) {}
259
260#endif
261
262
263/*-------------------------------------------------------------------------*/
264
265static void done(struct at91_ep *ep, struct at91_request *req, int status)
266{
267 unsigned stopped = ep->stopped;
268 struct at91_udc *udc = ep->udc;
269
270 list_del_init(&req->queue);
271 if (req->req.status == -EINPROGRESS)
272 req->req.status = status;
273 else
274 status = req->req.status;
275 if (status && status != -ESHUTDOWN)
276 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
277
278 ep->stopped = 1;
279 spin_unlock(&udc->lock);
280 req->req.complete(&ep->ep, &req->req);
281 spin_lock(&udc->lock);
282 ep->stopped = stopped;
283
284 /* ep0 is always ready; other endpoints need a non-empty queue */
285 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
286 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
287}
288
289/*-------------------------------------------------------------------------*/
290
291/* bits indicating OUT fifo has data ready */
292#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
293
294/*
295 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
296 * back most of the value you just read (because of side effects, including
297 * bits that may change after reading and before writing).
298 *
299 * Except when changing a specific bit, always write values which:
300 * - clear SET_FX bits (setting them could change something)
301 * - set CLR_FX bits (clearing them could change something)
302 *
303 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
304 * that shouldn't normally be changed.
305 *
306 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
307 * implying a need to wait for one write to complete (test relevant bits)
308 * before starting the next write. This shouldn't be an issue given how
309 * infrequently we write, except maybe for write-then-read idioms.
310 */
311#define SET_FX (AT91_UDP_TXPKTRDY)
312#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
313 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
314
315/* pull OUT packet data from the endpoint's fifo */
316static int read_fifo (struct at91_ep *ep, struct at91_request *req)
317{
318 u32 __iomem *creg = ep->creg;
319 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
320 u32 csr;
321 u8 *buf;
322 unsigned int count, bufferspace, is_done;
323
324 buf = req->req.buf + req->req.actual;
325 bufferspace = req->req.length - req->req.actual;
326
327 /*
328 * there might be nothing to read if ep_queue() calls us,
329 * or if we already emptied both pingpong buffers
330 */
331rescan:
332 csr = __raw_readl(creg);
333 if ((csr & RX_DATA_READY) == 0)
334 return 0;
335
336 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
337 if (count > ep->ep.maxpacket)
338 count = ep->ep.maxpacket;
339 if (count > bufferspace) {
340 DBG("%s buffer overflow\n", ep->ep.name);
341 req->req.status = -EOVERFLOW;
342 count = bufferspace;
343 }
344 __raw_readsb(dreg, buf, count);
345
346 /* release and swap pingpong mem bank */
347 csr |= CLR_FX;
348 if (ep->is_pingpong) {
349 if (ep->fifo_bank == 0) {
350 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
351 ep->fifo_bank = 1;
352 } else {
353 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
354 ep->fifo_bank = 0;
355 }
356 } else
357 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
358 __raw_writel(csr, creg);
359
360 req->req.actual += count;
361 is_done = (count < ep->ep.maxpacket);
362 if (count == bufferspace)
363 is_done = 1;
364
365 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
366 is_done ? " (done)" : "");
367
368 /*
369 * avoid extra trips through IRQ logic for packets already in
370 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
371 */
372 if (is_done)
373 done(ep, req, 0);
374 else if (ep->is_pingpong) {
375 /*
376 * One dummy read to delay the code because of a HW glitch:
377 * CSR returns bad RXCOUNT when read too soon after updating
378 * RX_DATA_BK flags.
379 */
380 csr = __raw_readl(creg);
381
382 bufferspace -= count;
383 buf += count;
384 goto rescan;
385 }
386
387 return is_done;
388}
389
390/* load fifo for an IN packet */
391static int write_fifo(struct at91_ep *ep, struct at91_request *req)
392{
393 u32 __iomem *creg = ep->creg;
394 u32 csr = __raw_readl(creg);
395 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
396 unsigned total, count, is_last;
397 u8 *buf;
398
399 /*
400 * TODO: allow for writing two packets to the fifo ... that'll
401 * reduce the amount of IN-NAKing, but probably won't affect
402 * throughput much. (Unlike preventing OUT-NAKing!)
403 */
404
405 /*
406 * If ep_queue() calls us, the queue is empty and possibly in
407 * odd states like TXCOMP not yet cleared (we do it, saving at
408 * least one IRQ) or the fifo not yet being free. Those aren't
409 * issues normally (IRQ handler fast path).
410 */
411 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
412 if (csr & AT91_UDP_TXCOMP) {
413 csr |= CLR_FX;
414 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
415 __raw_writel(csr, creg);
416 csr = __raw_readl(creg);
417 }
418 if (csr & AT91_UDP_TXPKTRDY)
419 return 0;
420 }
421
422 buf = req->req.buf + req->req.actual;
423 prefetch(buf);
424 total = req->req.length - req->req.actual;
425 if (ep->ep.maxpacket < total) {
426 count = ep->ep.maxpacket;
427 is_last = 0;
428 } else {
429 count = total;
430 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
431 }
432
433 /*
434 * Write the packet, maybe it's a ZLP.
435 *
436 * NOTE: incrementing req->actual before we receive the ACK means
437 * gadget driver IN bytecounts can be wrong in fault cases. That's
438 * fixable with PIO drivers like this one (save "count" here, and
439 * do the increment later on TX irq), but not for most DMA hardware.
440 *
441 * So all gadget drivers must accept that potential error. Some
442 * hardware supports precise fifo status reporting, letting them
443 * recover when the actual bytecount matters (e.g. for USB Test
444 * and Measurement Class devices).
445 */
446 __raw_writesb(dreg, buf, count);
447 csr &= ~SET_FX;
448 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
449 __raw_writel(csr, creg);
450 req->req.actual += count;
451
452 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
453 is_last ? " (done)" : "");
454 if (is_last)
455 done(ep, req, 0);
456 return is_last;
457}
458
459static void nuke(struct at91_ep *ep, int status)
460{
461 struct at91_request *req;
462
463 // terminer chaque requete dans la queue
464 ep->stopped = 1;
465 if (list_empty(&ep->queue))
466 return;
467
468 VDBG("%s %s\n", __func__, ep->ep.name);
469 while (!list_empty(&ep->queue)) {
470 req = list_entry(ep->queue.next, struct at91_request, queue);
471 done(ep, req, status);
472 }
473}
474
475/*-------------------------------------------------------------------------*/
476
477static int at91_ep_enable(struct usb_ep *_ep,
478 const struct usb_endpoint_descriptor *desc)
479{
480 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
481 struct at91_udc *udc = ep->udc;
482 u16 maxpacket;
483 u32 tmp;
484 unsigned long flags;
485
486 if (!_ep || !ep
487 || !desc || ep->desc
488 || _ep->name == ep0name
489 || desc->bDescriptorType != USB_DT_ENDPOINT
490 || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0
491 || maxpacket > ep->maxpacket) {
492 DBG("bad ep or descriptor\n");
493 return -EINVAL;
494 }
495
496 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
497 DBG("bogus device state\n");
498 return -ESHUTDOWN;
499 }
500
501 tmp = usb_endpoint_type(desc);
502 switch (tmp) {
503 case USB_ENDPOINT_XFER_CONTROL:
504 DBG("only one control endpoint\n");
505 return -EINVAL;
506 case USB_ENDPOINT_XFER_INT:
507 if (maxpacket > 64)
508 goto bogus_max;
509 break;
510 case USB_ENDPOINT_XFER_BULK:
511 switch (maxpacket) {
512 case 8:
513 case 16:
514 case 32:
515 case 64:
516 goto ok;
517 }
518bogus_max:
519 DBG("bogus maxpacket %d\n", maxpacket);
520 return -EINVAL;
521 case USB_ENDPOINT_XFER_ISOC:
522 if (!ep->is_pingpong) {
523 DBG("iso requires double buffering\n");
524 return -EINVAL;
525 }
526 break;
527 }
528
529ok:
530 spin_lock_irqsave(&udc->lock, flags);
531
532 /* initialize endpoint to match this descriptor */
533 ep->is_in = usb_endpoint_dir_in(desc);
534 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
535 ep->stopped = 0;
536 if (ep->is_in)
537 tmp |= 0x04;
538 tmp <<= 8;
539 tmp |= AT91_UDP_EPEDS;
540 __raw_writel(tmp, ep->creg);
541
542 ep->desc = desc;
543 ep->ep.maxpacket = maxpacket;
544
545 /*
546 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
547 * since endpoint resets don't reset hw pingpong state.
548 */
549 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
550 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
551
552 spin_unlock_irqrestore(&udc->lock, flags);
553 return 0;
554}
555
556static int at91_ep_disable (struct usb_ep * _ep)
557{
558 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
559 struct at91_udc *udc = ep->udc;
560 unsigned long flags;
561
562 if (ep == &ep->udc->ep[0])
563 return -EINVAL;
564
565 spin_lock_irqsave(&udc->lock, flags);
566
567 nuke(ep, -ESHUTDOWN);
568
569 /* restore the endpoint's pristine config */
570 ep->desc = NULL;
571 ep->ep.maxpacket = ep->maxpacket;
572
573 /* reset fifos and endpoint */
574 if (ep->udc->clocked) {
575 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
576 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
577 __raw_writel(0, ep->creg);
578 }
579
580 spin_unlock_irqrestore(&udc->lock, flags);
581 return 0;
582}
583
584/*
585 * this is a PIO-only driver, so there's nothing
586 * interesting for request or buffer allocation.
587 */
588
589static struct usb_request *
590at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
591{
592 struct at91_request *req;
593
594 req = kzalloc(sizeof (struct at91_request), gfp_flags);
595 if (!req)
596 return NULL;
597
598 INIT_LIST_HEAD(&req->queue);
599 return &req->req;
600}
601
602static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
603{
604 struct at91_request *req;
605
606 req = container_of(_req, struct at91_request, req);
607 BUG_ON(!list_empty(&req->queue));
608 kfree(req);
609}
610
611static int at91_ep_queue(struct usb_ep *_ep,
612 struct usb_request *_req, gfp_t gfp_flags)
613{
614 struct at91_request *req;
615 struct at91_ep *ep;
616 struct at91_udc *udc;
617 int status;
618 unsigned long flags;
619
620 req = container_of(_req, struct at91_request, req);
621 ep = container_of(_ep, struct at91_ep, ep);
622
623 if (!_req || !_req->complete
624 || !_req->buf || !list_empty(&req->queue)) {
625 DBG("invalid request\n");
626 return -EINVAL;
627 }
628
629 if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
630 DBG("invalid ep\n");
631 return -EINVAL;
632 }
633
634 udc = ep->udc;
635
636 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
637 DBG("invalid device\n");
638 return -EINVAL;
639 }
640
641 _req->status = -EINPROGRESS;
642 _req->actual = 0;
643
644 spin_lock_irqsave(&udc->lock, flags);
645
646 /* try to kickstart any empty and idle queue */
647 if (list_empty(&ep->queue) && !ep->stopped) {
648 int is_ep0;
649
650 /*
651 * If this control request has a non-empty DATA stage, this
652 * will start that stage. It works just like a non-control
653 * request (until the status stage starts, maybe early).
654 *
655 * If the data stage is empty, then this starts a successful
656 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
657 */
658 is_ep0 = (ep->ep.name == ep0name);
659 if (is_ep0) {
660 u32 tmp;
661
662 if (!udc->req_pending) {
663 status = -EINVAL;
664 goto done;
665 }
666
667 /*
668 * defer changing CONFG until after the gadget driver
669 * reconfigures the endpoints.
670 */
671 if (udc->wait_for_config_ack) {
672 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
673 tmp ^= AT91_UDP_CONFG;
674 VDBG("toggle config\n");
675 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
676 }
677 if (req->req.length == 0) {
678ep0_in_status:
679 PACKET("ep0 in/status\n");
680 status = 0;
681 tmp = __raw_readl(ep->creg);
682 tmp &= ~SET_FX;
683 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
684 __raw_writel(tmp, ep->creg);
685 udc->req_pending = 0;
686 goto done;
687 }
688 }
689
690 if (ep->is_in)
691 status = write_fifo(ep, req);
692 else {
693 status = read_fifo(ep, req);
694
695 /* IN/STATUS stage is otherwise triggered by irq */
696 if (status && is_ep0)
697 goto ep0_in_status;
698 }
699 } else
700 status = 0;
701
702 if (req && !status) {
703 list_add_tail (&req->queue, &ep->queue);
704 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
705 }
706done:
707 spin_unlock_irqrestore(&udc->lock, flags);
708 return (status < 0) ? status : 0;
709}
710
711static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
712{
713 struct at91_ep *ep;
714 struct at91_request *req;
715 unsigned long flags;
716 struct at91_udc *udc;
717
718 ep = container_of(_ep, struct at91_ep, ep);
719 if (!_ep || ep->ep.name == ep0name)
720 return -EINVAL;
721
722 udc = ep->udc;
723
724 spin_lock_irqsave(&udc->lock, flags);
725
726 /* make sure it's actually queued on this endpoint */
727 list_for_each_entry (req, &ep->queue, queue) {
728 if (&req->req == _req)
729 break;
730 }
731 if (&req->req != _req) {
732 spin_unlock_irqrestore(&udc->lock, flags);
733 return -EINVAL;
734 }
735
736 done(ep, req, -ECONNRESET);
737 spin_unlock_irqrestore(&udc->lock, flags);
738 return 0;
739}
740
741static int at91_ep_set_halt(struct usb_ep *_ep, int value)
742{
743 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
744 struct at91_udc *udc = ep->udc;
745 u32 __iomem *creg;
746 u32 csr;
747 unsigned long flags;
748 int status = 0;
749
750 if (!_ep || ep->is_iso || !ep->udc->clocked)
751 return -EINVAL;
752
753 creg = ep->creg;
754 spin_lock_irqsave(&udc->lock, flags);
755
756 csr = __raw_readl(creg);
757
758 /*
759 * fail with still-busy IN endpoints, ensuring correct sequencing
760 * of data tx then stall. note that the fifo rx bytecount isn't
761 * completely accurate as a tx bytecount.
762 */
763 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
764 status = -EAGAIN;
765 else {
766 csr |= CLR_FX;
767 csr &= ~SET_FX;
768 if (value) {
769 csr |= AT91_UDP_FORCESTALL;
770 VDBG("halt %s\n", ep->ep.name);
771 } else {
772 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
773 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
774 csr &= ~AT91_UDP_FORCESTALL;
775 }
776 __raw_writel(csr, creg);
777 }
778
779 spin_unlock_irqrestore(&udc->lock, flags);
780 return status;
781}
782
783static const struct usb_ep_ops at91_ep_ops = {
784 .enable = at91_ep_enable,
785 .disable = at91_ep_disable,
786 .alloc_request = at91_ep_alloc_request,
787 .free_request = at91_ep_free_request,
788 .queue = at91_ep_queue,
789 .dequeue = at91_ep_dequeue,
790 .set_halt = at91_ep_set_halt,
791 // there's only imprecise fifo status reporting
792};
793
794/*-------------------------------------------------------------------------*/
795
796static int at91_get_frame(struct usb_gadget *gadget)
797{
798 struct at91_udc *udc = to_udc(gadget);
799
800 if (!to_udc(gadget)->clocked)
801 return -EINVAL;
802 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
803}
804
805static int at91_wakeup(struct usb_gadget *gadget)
806{
807 struct at91_udc *udc = to_udc(gadget);
808 u32 glbstate;
809 int status = -EINVAL;
810 unsigned long flags;
811
812 DBG("%s\n", __func__ );
813 spin_lock_irqsave(&udc->lock, flags);
814
815 if (!udc->clocked || !udc->suspended)
816 goto done;
817
818 /* NOTE: some "early versions" handle ESR differently ... */
819
820 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
821 if (!(glbstate & AT91_UDP_ESR))
822 goto done;
823 glbstate |= AT91_UDP_ESR;
824 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
825
826done:
827 spin_unlock_irqrestore(&udc->lock, flags);
828 return status;
829}
830
831/* reinit == restore initial software state */
832static void udc_reinit(struct at91_udc *udc)
833{
834 u32 i;
835
836 INIT_LIST_HEAD(&udc->gadget.ep_list);
837 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
838
839 for (i = 0; i < NUM_ENDPOINTS; i++) {
840 struct at91_ep *ep = &udc->ep[i];
841
842 if (i != 0)
843 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
844 ep->desc = NULL;
845 ep->stopped = 0;
846 ep->fifo_bank = 0;
847 ep->ep.maxpacket = ep->maxpacket;
848 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
849 // initialiser une queue par endpoint
850 INIT_LIST_HEAD(&ep->queue);
851 }
852}
853
854static void stop_activity(struct at91_udc *udc)
855{
856 struct usb_gadget_driver *driver = udc->driver;
857 int i;
858
859 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
860 driver = NULL;
861 udc->gadget.speed = USB_SPEED_UNKNOWN;
862 udc->suspended = 0;
863
864 for (i = 0; i < NUM_ENDPOINTS; i++) {
865 struct at91_ep *ep = &udc->ep[i];
866 ep->stopped = 1;
867 nuke(ep, -ESHUTDOWN);
868 }
869 if (driver) {
870 spin_unlock(&udc->lock);
871 driver->disconnect(&udc->gadget);
872 spin_lock(&udc->lock);
873 }
874
875 udc_reinit(udc);
876}
877
878static void clk_on(struct at91_udc *udc)
879{
880 if (udc->clocked)
881 return;
882 udc->clocked = 1;
883 clk_enable(udc->iclk);
884 clk_enable(udc->fclk);
885}
886
887static void clk_off(struct at91_udc *udc)
888{
889 if (!udc->clocked)
890 return;
891 udc->clocked = 0;
892 udc->gadget.speed = USB_SPEED_UNKNOWN;
893 clk_disable(udc->fclk);
894 clk_disable(udc->iclk);
895}
896
897/*
898 * activate/deactivate link with host; minimize power usage for
899 * inactive links by cutting clocks and transceiver power.
900 */
901static void pullup(struct at91_udc *udc, int is_on)
902{
903 int active = !udc->board.pullup_active_low;
904
905 if (!udc->enabled || !udc->vbus)
906 is_on = 0;
907 DBG("%sactive\n", is_on ? "" : "in");
908
909 if (is_on) {
910 clk_on(udc);
911 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
912 at91_udp_write(udc, AT91_UDP_TXVC, 0);
913 if (cpu_is_at91rm9200())
914 gpio_set_value(udc->board.pullup_pin, active);
915 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
916 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
917
918 txvc |= AT91_UDP_TXVC_PUON;
919 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
920 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
921 u32 usbpucr;
922
923 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
924 usbpucr |= AT91_MATRIX_USBPUCR_PUON;
925 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
926 }
927 } else {
928 stop_activity(udc);
929 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
930 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
931 if (cpu_is_at91rm9200())
932 gpio_set_value(udc->board.pullup_pin, !active);
933 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
934 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
935
936 txvc &= ~AT91_UDP_TXVC_PUON;
937 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
938 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
939 u32 usbpucr;
940
941 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
942 usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
943 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
944 }
945 clk_off(udc);
946 }
947}
948
949/* vbus is here! turn everything on that's ready */
950static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
951{
952 struct at91_udc *udc = to_udc(gadget);
953 unsigned long flags;
954
955 // VDBG("vbus %s\n", is_active ? "on" : "off");
956 spin_lock_irqsave(&udc->lock, flags);
957 udc->vbus = (is_active != 0);
958 if (udc->driver)
959 pullup(udc, is_active);
960 else
961 pullup(udc, 0);
962 spin_unlock_irqrestore(&udc->lock, flags);
963 return 0;
964}
965
966static int at91_pullup(struct usb_gadget *gadget, int is_on)
967{
968 struct at91_udc *udc = to_udc(gadget);
969 unsigned long flags;
970
971 spin_lock_irqsave(&udc->lock, flags);
972 udc->enabled = is_on = !!is_on;
973 pullup(udc, is_on);
974 spin_unlock_irqrestore(&udc->lock, flags);
975 return 0;
976}
977
978static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
979{
980 struct at91_udc *udc = to_udc(gadget);
981 unsigned long flags;
982
983 spin_lock_irqsave(&udc->lock, flags);
984 udc->selfpowered = (is_on != 0);
985 spin_unlock_irqrestore(&udc->lock, flags);
986 return 0;
987}
988
989static int at91_start(struct usb_gadget_driver *driver,
990 int (*bind)(struct usb_gadget *));
991static int at91_stop(struct usb_gadget_driver *driver);
992
993static const struct usb_gadget_ops at91_udc_ops = {
994 .get_frame = at91_get_frame,
995 .wakeup = at91_wakeup,
996 .set_selfpowered = at91_set_selfpowered,
997 .vbus_session = at91_vbus_session,
998 .pullup = at91_pullup,
999 .start = at91_start,
1000 .stop = at91_stop,
1001
1002 /*
1003 * VBUS-powered devices may also also want to support bigger
1004 * power budgets after an appropriate SET_CONFIGURATION.
1005 */
1006 // .vbus_power = at91_vbus_power,
1007};
1008
1009/*-------------------------------------------------------------------------*/
1010
1011static int handle_ep(struct at91_ep *ep)
1012{
1013 struct at91_request *req;
1014 u32 __iomem *creg = ep->creg;
1015 u32 csr = __raw_readl(creg);
1016
1017 if (!list_empty(&ep->queue))
1018 req = list_entry(ep->queue.next,
1019 struct at91_request, queue);
1020 else
1021 req = NULL;
1022
1023 if (ep->is_in) {
1024 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1025 csr |= CLR_FX;
1026 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1027 __raw_writel(csr, creg);
1028 }
1029 if (req)
1030 return write_fifo(ep, req);
1031
1032 } else {
1033 if (csr & AT91_UDP_STALLSENT) {
1034 /* STALLSENT bit == ISOERR */
1035 if (ep->is_iso && req)
1036 req->req.status = -EILSEQ;
1037 csr |= CLR_FX;
1038 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1039 __raw_writel(csr, creg);
1040 csr = __raw_readl(creg);
1041 }
1042 if (req && (csr & RX_DATA_READY))
1043 return read_fifo(ep, req);
1044 }
1045 return 0;
1046}
1047
1048union setup {
1049 u8 raw[8];
1050 struct usb_ctrlrequest r;
1051};
1052
1053static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1054{
1055 u32 __iomem *creg = ep->creg;
1056 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1057 unsigned rxcount, i = 0;
1058 u32 tmp;
1059 union setup pkt;
1060 int status = 0;
1061
1062 /* read and ack SETUP; hard-fail for bogus packets */
1063 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1064 if (likely(rxcount == 8)) {
1065 while (rxcount--)
1066 pkt.raw[i++] = __raw_readb(dreg);
1067 if (pkt.r.bRequestType & USB_DIR_IN) {
1068 csr |= AT91_UDP_DIR;
1069 ep->is_in = 1;
1070 } else {
1071 csr &= ~AT91_UDP_DIR;
1072 ep->is_in = 0;
1073 }
1074 } else {
1075 // REVISIT this happens sometimes under load; why??
1076 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1077 status = -EINVAL;
1078 }
1079 csr |= CLR_FX;
1080 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1081 __raw_writel(csr, creg);
1082 udc->wait_for_addr_ack = 0;
1083 udc->wait_for_config_ack = 0;
1084 ep->stopped = 0;
1085 if (unlikely(status != 0))
1086 goto stall;
1087
1088#define w_index le16_to_cpu(pkt.r.wIndex)
1089#define w_value le16_to_cpu(pkt.r.wValue)
1090#define w_length le16_to_cpu(pkt.r.wLength)
1091
1092 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1093 pkt.r.bRequestType, pkt.r.bRequest,
1094 w_value, w_index, w_length);
1095
1096 /*
1097 * A few standard requests get handled here, ones that touch
1098 * hardware ... notably for device and endpoint features.
1099 */
1100 udc->req_pending = 1;
1101 csr = __raw_readl(creg);
1102 csr |= CLR_FX;
1103 csr &= ~SET_FX;
1104 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1105
1106 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1107 | USB_REQ_SET_ADDRESS:
1108 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1109 udc->addr = w_value;
1110 udc->wait_for_addr_ack = 1;
1111 udc->req_pending = 0;
1112 /* FADDR is set later, when we ack host STATUS */
1113 return;
1114
1115 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1116 | USB_REQ_SET_CONFIGURATION:
1117 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1118 if (pkt.r.wValue)
1119 udc->wait_for_config_ack = (tmp == 0);
1120 else
1121 udc->wait_for_config_ack = (tmp != 0);
1122 if (udc->wait_for_config_ack)
1123 VDBG("wait for config\n");
1124 /* CONFG is toggled later, if gadget driver succeeds */
1125 break;
1126
1127 /*
1128 * Hosts may set or clear remote wakeup status, and
1129 * devices may report they're VBUS powered.
1130 */
1131 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1132 | USB_REQ_GET_STATUS:
1133 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1134 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1135 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1136 PACKET("get device status\n");
1137 __raw_writeb(tmp, dreg);
1138 __raw_writeb(0, dreg);
1139 goto write_in;
1140 /* then STATUS starts later, automatically */
1141 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1142 | USB_REQ_SET_FEATURE:
1143 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1144 goto stall;
1145 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1146 tmp |= AT91_UDP_ESR;
1147 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1148 goto succeed;
1149 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1150 | USB_REQ_CLEAR_FEATURE:
1151 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1152 goto stall;
1153 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1154 tmp &= ~AT91_UDP_ESR;
1155 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1156 goto succeed;
1157
1158 /*
1159 * Interfaces have no feature settings; this is pretty useless.
1160 * we won't even insist the interface exists...
1161 */
1162 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1163 | USB_REQ_GET_STATUS:
1164 PACKET("get interface status\n");
1165 __raw_writeb(0, dreg);
1166 __raw_writeb(0, dreg);
1167 goto write_in;
1168 /* then STATUS starts later, automatically */
1169 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1170 | USB_REQ_SET_FEATURE:
1171 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1172 | USB_REQ_CLEAR_FEATURE:
1173 goto stall;
1174
1175 /*
1176 * Hosts may clear bulk/intr endpoint halt after the gadget
1177 * driver sets it (not widely used); or set it (for testing)
1178 */
1179 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1180 | USB_REQ_GET_STATUS:
1181 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1182 ep = &udc->ep[tmp];
1183 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->desc))
1184 goto stall;
1185
1186 if (tmp) {
1187 if ((w_index & USB_DIR_IN)) {
1188 if (!ep->is_in)
1189 goto stall;
1190 } else if (ep->is_in)
1191 goto stall;
1192 }
1193 PACKET("get %s status\n", ep->ep.name);
1194 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1195 tmp = (1 << USB_ENDPOINT_HALT);
1196 else
1197 tmp = 0;
1198 __raw_writeb(tmp, dreg);
1199 __raw_writeb(0, dreg);
1200 goto write_in;
1201 /* then STATUS starts later, automatically */
1202 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1203 | USB_REQ_SET_FEATURE:
1204 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1205 ep = &udc->ep[tmp];
1206 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1207 goto stall;
1208 if (!ep->desc || ep->is_iso)
1209 goto stall;
1210 if ((w_index & USB_DIR_IN)) {
1211 if (!ep->is_in)
1212 goto stall;
1213 } else if (ep->is_in)
1214 goto stall;
1215
1216 tmp = __raw_readl(ep->creg);
1217 tmp &= ~SET_FX;
1218 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1219 __raw_writel(tmp, ep->creg);
1220 goto succeed;
1221 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1222 | USB_REQ_CLEAR_FEATURE:
1223 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1224 ep = &udc->ep[tmp];
1225 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1226 goto stall;
1227 if (tmp == 0)
1228 goto succeed;
1229 if (!ep->desc || ep->is_iso)
1230 goto stall;
1231 if ((w_index & USB_DIR_IN)) {
1232 if (!ep->is_in)
1233 goto stall;
1234 } else if (ep->is_in)
1235 goto stall;
1236
1237 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1238 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1239 tmp = __raw_readl(ep->creg);
1240 tmp |= CLR_FX;
1241 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1242 __raw_writel(tmp, ep->creg);
1243 if (!list_empty(&ep->queue))
1244 handle_ep(ep);
1245 goto succeed;
1246 }
1247
1248#undef w_value
1249#undef w_index
1250#undef w_length
1251
1252 /* pass request up to the gadget driver */
1253 if (udc->driver) {
1254 spin_unlock(&udc->lock);
1255 status = udc->driver->setup(&udc->gadget, &pkt.r);
1256 spin_lock(&udc->lock);
1257 }
1258 else
1259 status = -ENODEV;
1260 if (status < 0) {
1261stall:
1262 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1263 pkt.r.bRequestType, pkt.r.bRequest, status);
1264 csr |= AT91_UDP_FORCESTALL;
1265 __raw_writel(csr, creg);
1266 udc->req_pending = 0;
1267 }
1268 return;
1269
1270succeed:
1271 /* immediate successful (IN) STATUS after zero length DATA */
1272 PACKET("ep0 in/status\n");
1273write_in:
1274 csr |= AT91_UDP_TXPKTRDY;
1275 __raw_writel(csr, creg);
1276 udc->req_pending = 0;
1277}
1278
1279static void handle_ep0(struct at91_udc *udc)
1280{
1281 struct at91_ep *ep0 = &udc->ep[0];
1282 u32 __iomem *creg = ep0->creg;
1283 u32 csr = __raw_readl(creg);
1284 struct at91_request *req;
1285
1286 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1287 nuke(ep0, -EPROTO);
1288 udc->req_pending = 0;
1289 csr |= CLR_FX;
1290 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1291 __raw_writel(csr, creg);
1292 VDBG("ep0 stalled\n");
1293 csr = __raw_readl(creg);
1294 }
1295 if (csr & AT91_UDP_RXSETUP) {
1296 nuke(ep0, 0);
1297 udc->req_pending = 0;
1298 handle_setup(udc, ep0, csr);
1299 return;
1300 }
1301
1302 if (list_empty(&ep0->queue))
1303 req = NULL;
1304 else
1305 req = list_entry(ep0->queue.next, struct at91_request, queue);
1306
1307 /* host ACKed an IN packet that we sent */
1308 if (csr & AT91_UDP_TXCOMP) {
1309 csr |= CLR_FX;
1310 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1311
1312 /* write more IN DATA? */
1313 if (req && ep0->is_in) {
1314 if (handle_ep(ep0))
1315 udc->req_pending = 0;
1316
1317 /*
1318 * Ack after:
1319 * - last IN DATA packet (including GET_STATUS)
1320 * - IN/STATUS for OUT DATA
1321 * - IN/STATUS for any zero-length DATA stage
1322 * except for the IN DATA case, the host should send
1323 * an OUT status later, which we'll ack.
1324 */
1325 } else {
1326 udc->req_pending = 0;
1327 __raw_writel(csr, creg);
1328
1329 /*
1330 * SET_ADDRESS takes effect only after the STATUS
1331 * (to the original address) gets acked.
1332 */
1333 if (udc->wait_for_addr_ack) {
1334 u32 tmp;
1335
1336 at91_udp_write(udc, AT91_UDP_FADDR,
1337 AT91_UDP_FEN | udc->addr);
1338 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1339 tmp &= ~AT91_UDP_FADDEN;
1340 if (udc->addr)
1341 tmp |= AT91_UDP_FADDEN;
1342 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1343
1344 udc->wait_for_addr_ack = 0;
1345 VDBG("address %d\n", udc->addr);
1346 }
1347 }
1348 }
1349
1350 /* OUT packet arrived ... */
1351 else if (csr & AT91_UDP_RX_DATA_BK0) {
1352 csr |= CLR_FX;
1353 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1354
1355 /* OUT DATA stage */
1356 if (!ep0->is_in) {
1357 if (req) {
1358 if (handle_ep(ep0)) {
1359 /* send IN/STATUS */
1360 PACKET("ep0 in/status\n");
1361 csr = __raw_readl(creg);
1362 csr &= ~SET_FX;
1363 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1364 __raw_writel(csr, creg);
1365 udc->req_pending = 0;
1366 }
1367 } else if (udc->req_pending) {
1368 /*
1369 * AT91 hardware has a hard time with this
1370 * "deferred response" mode for control-OUT
1371 * transfers. (For control-IN it's fine.)
1372 *
1373 * The normal solution leaves OUT data in the
1374 * fifo until the gadget driver is ready.
1375 * We couldn't do that here without disabling
1376 * the IRQ that tells about SETUP packets,
1377 * e.g. when the host gets impatient...
1378 *
1379 * Working around it by copying into a buffer
1380 * would almost be a non-deferred response,
1381 * except that it wouldn't permit reliable
1382 * stalling of the request. Instead, demand
1383 * that gadget drivers not use this mode.
1384 */
1385 DBG("no control-OUT deferred responses!\n");
1386 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1387 udc->req_pending = 0;
1388 }
1389
1390 /* STATUS stage for control-IN; ack. */
1391 } else {
1392 PACKET("ep0 out/status ACK\n");
1393 __raw_writel(csr, creg);
1394
1395 /* "early" status stage */
1396 if (req)
1397 done(ep0, req, 0);
1398 }
1399 }
1400}
1401
1402static irqreturn_t at91_udc_irq (int irq, void *_udc)
1403{
1404 struct at91_udc *udc = _udc;
1405 u32 rescans = 5;
1406 int disable_clock = 0;
1407 unsigned long flags;
1408
1409 spin_lock_irqsave(&udc->lock, flags);
1410
1411 if (!udc->clocked) {
1412 clk_on(udc);
1413 disable_clock = 1;
1414 }
1415
1416 while (rescans--) {
1417 u32 status;
1418
1419 status = at91_udp_read(udc, AT91_UDP_ISR)
1420 & at91_udp_read(udc, AT91_UDP_IMR);
1421 if (!status)
1422 break;
1423
1424 /* USB reset irq: not maskable */
1425 if (status & AT91_UDP_ENDBUSRES) {
1426 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1427 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1428 /* Atmel code clears this irq twice */
1429 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1430 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1431 VDBG("end bus reset\n");
1432 udc->addr = 0;
1433 stop_activity(udc);
1434
1435 /* enable ep0 */
1436 at91_udp_write(udc, AT91_UDP_CSR(0),
1437 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1438 udc->gadget.speed = USB_SPEED_FULL;
1439 udc->suspended = 0;
1440 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1441
1442 /*
1443 * NOTE: this driver keeps clocks off unless the
1444 * USB host is present. That saves power, but for
1445 * boards that don't support VBUS detection, both
1446 * clocks need to be active most of the time.
1447 */
1448
1449 /* host initiated suspend (3+ms bus idle) */
1450 } else if (status & AT91_UDP_RXSUSP) {
1451 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1452 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1453 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1454 // VDBG("bus suspend\n");
1455 if (udc->suspended)
1456 continue;
1457 udc->suspended = 1;
1458
1459 /*
1460 * NOTE: when suspending a VBUS-powered device, the
1461 * gadget driver should switch into slow clock mode
1462 * and then into standby to avoid drawing more than
1463 * 500uA power (2500uA for some high-power configs).
1464 */
1465 if (udc->driver && udc->driver->suspend) {
1466 spin_unlock(&udc->lock);
1467 udc->driver->suspend(&udc->gadget);
1468 spin_lock(&udc->lock);
1469 }
1470
1471 /* host initiated resume */
1472 } else if (status & AT91_UDP_RXRSM) {
1473 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1474 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1475 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1476 // VDBG("bus resume\n");
1477 if (!udc->suspended)
1478 continue;
1479 udc->suspended = 0;
1480
1481 /*
1482 * NOTE: for a VBUS-powered device, the gadget driver
1483 * would normally want to switch out of slow clock
1484 * mode into normal mode.
1485 */
1486 if (udc->driver && udc->driver->resume) {
1487 spin_unlock(&udc->lock);
1488 udc->driver->resume(&udc->gadget);
1489 spin_lock(&udc->lock);
1490 }
1491
1492 /* endpoint IRQs are cleared by handling them */
1493 } else {
1494 int i;
1495 unsigned mask = 1;
1496 struct at91_ep *ep = &udc->ep[1];
1497
1498 if (status & mask)
1499 handle_ep0(udc);
1500 for (i = 1; i < NUM_ENDPOINTS; i++) {
1501 mask <<= 1;
1502 if (status & mask)
1503 handle_ep(ep);
1504 ep++;
1505 }
1506 }
1507 }
1508
1509 if (disable_clock)
1510 clk_off(udc);
1511
1512 spin_unlock_irqrestore(&udc->lock, flags);
1513
1514 return IRQ_HANDLED;
1515}
1516
1517/*-------------------------------------------------------------------------*/
1518
1519static void nop_release(struct device *dev)
1520{
1521 /* nothing to free */
1522}
1523
1524static struct at91_udc controller = {
1525 .gadget = {
1526 .ops = &at91_udc_ops,
1527 .ep0 = &controller.ep[0].ep,
1528 .name = driver_name,
1529 .dev = {
1530 .init_name = "gadget",
1531 .release = nop_release,
1532 }
1533 },
1534 .ep[0] = {
1535 .ep = {
1536 .name = ep0name,
1537 .ops = &at91_ep_ops,
1538 },
1539 .udc = &controller,
1540 .maxpacket = 8,
1541 .int_mask = 1 << 0,
1542 },
1543 .ep[1] = {
1544 .ep = {
1545 .name = "ep1",
1546 .ops = &at91_ep_ops,
1547 },
1548 .udc = &controller,
1549 .is_pingpong = 1,
1550 .maxpacket = 64,
1551 .int_mask = 1 << 1,
1552 },
1553 .ep[2] = {
1554 .ep = {
1555 .name = "ep2",
1556 .ops = &at91_ep_ops,
1557 },
1558 .udc = &controller,
1559 .is_pingpong = 1,
1560 .maxpacket = 64,
1561 .int_mask = 1 << 2,
1562 },
1563 .ep[3] = {
1564 .ep = {
1565 /* could actually do bulk too */
1566 .name = "ep3-int",
1567 .ops = &at91_ep_ops,
1568 },
1569 .udc = &controller,
1570 .maxpacket = 8,
1571 .int_mask = 1 << 3,
1572 },
1573 .ep[4] = {
1574 .ep = {
1575 .name = "ep4",
1576 .ops = &at91_ep_ops,
1577 },
1578 .udc = &controller,
1579 .is_pingpong = 1,
1580 .maxpacket = 256,
1581 .int_mask = 1 << 4,
1582 },
1583 .ep[5] = {
1584 .ep = {
1585 .name = "ep5",
1586 .ops = &at91_ep_ops,
1587 },
1588 .udc = &controller,
1589 .is_pingpong = 1,
1590 .maxpacket = 256,
1591 .int_mask = 1 << 5,
1592 },
1593 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1594};
1595
1596static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1597{
1598 value ^= udc->board.vbus_active_low;
1599 if (value != udc->vbus)
1600 at91_vbus_session(&udc->gadget, value);
1601}
1602
1603static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1604{
1605 struct at91_udc *udc = _udc;
1606
1607 /* vbus needs at least brief debouncing */
1608 udelay(10);
1609 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1610
1611 return IRQ_HANDLED;
1612}
1613
1614static void at91_vbus_timer_work(struct work_struct *work)
1615{
1616 struct at91_udc *udc = container_of(work, struct at91_udc,
1617 vbus_timer_work);
1618
1619 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1620
1621 if (!timer_pending(&udc->vbus_timer))
1622 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1623}
1624
1625static void at91_vbus_timer(unsigned long data)
1626{
1627 struct at91_udc *udc = (struct at91_udc *)data;
1628
1629 /*
1630 * If we are polling vbus it is likely that the gpio is on an
1631 * bus such as i2c or spi which may sleep, so schedule some work
1632 * to read the vbus gpio
1633 */
1634 if (!work_pending(&udc->vbus_timer_work))
1635 schedule_work(&udc->vbus_timer_work);
1636}
1637
1638static int at91_start(struct usb_gadget_driver *driver,
1639 int (*bind)(struct usb_gadget *))
1640{
1641 struct at91_udc *udc = &controller;
1642 int retval;
1643 unsigned long flags;
1644
1645 if (!driver
1646 || driver->speed < USB_SPEED_FULL
1647 || !bind
1648 || !driver->setup) {
1649 DBG("bad parameter.\n");
1650 return -EINVAL;
1651 }
1652
1653 if (udc->driver) {
1654 DBG("UDC already has a gadget driver\n");
1655 return -EBUSY;
1656 }
1657
1658 udc->driver = driver;
1659 udc->gadget.dev.driver = &driver->driver;
1660 dev_set_drvdata(&udc->gadget.dev, &driver->driver);
1661 udc->enabled = 1;
1662 udc->selfpowered = 1;
1663
1664 retval = bind(&udc->gadget);
1665 if (retval) {
1666 DBG("bind() returned %d\n", retval);
1667 udc->driver = NULL;
1668 udc->gadget.dev.driver = NULL;
1669 dev_set_drvdata(&udc->gadget.dev, NULL);
1670 udc->enabled = 0;
1671 udc->selfpowered = 0;
1672 return retval;
1673 }
1674
1675 spin_lock_irqsave(&udc->lock, flags);
1676 pullup(udc, 1);
1677 spin_unlock_irqrestore(&udc->lock, flags);
1678
1679 DBG("bound to %s\n", driver->driver.name);
1680 return 0;
1681}
1682
1683static int at91_stop(struct usb_gadget_driver *driver)
1684{
1685 struct at91_udc *udc = &controller;
1686 unsigned long flags;
1687
1688 if (!driver || driver != udc->driver || !driver->unbind)
1689 return -EINVAL;
1690
1691 spin_lock_irqsave(&udc->lock, flags);
1692 udc->enabled = 0;
1693 at91_udp_write(udc, AT91_UDP_IDR, ~0);
1694 pullup(udc, 0);
1695 spin_unlock_irqrestore(&udc->lock, flags);
1696
1697 driver->unbind(&udc->gadget);
1698 udc->gadget.dev.driver = NULL;
1699 dev_set_drvdata(&udc->gadget.dev, NULL);
1700 udc->driver = NULL;
1701
1702 DBG("unbound from %s\n", driver->driver.name);
1703 return 0;
1704}
1705
1706/*-------------------------------------------------------------------------*/
1707
1708static void at91udc_shutdown(struct platform_device *dev)
1709{
1710 struct at91_udc *udc = platform_get_drvdata(dev);
1711 unsigned long flags;
1712
1713 /* force disconnect on reboot */
1714 spin_lock_irqsave(&udc->lock, flags);
1715 pullup(platform_get_drvdata(dev), 0);
1716 spin_unlock_irqrestore(&udc->lock, flags);
1717}
1718
1719static int __init at91udc_probe(struct platform_device *pdev)
1720{
1721 struct device *dev = &pdev->dev;
1722 struct at91_udc *udc;
1723 int retval;
1724 struct resource *res;
1725
1726 if (!dev->platform_data) {
1727 /* small (so we copy it) but critical! */
1728 DBG("missing platform_data\n");
1729 return -ENODEV;
1730 }
1731
1732 if (pdev->num_resources != 2) {
1733 DBG("invalid num_resources\n");
1734 return -ENODEV;
1735 }
1736 if ((pdev->resource[0].flags != IORESOURCE_MEM)
1737 || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1738 DBG("invalid resource type\n");
1739 return -ENODEV;
1740 }
1741
1742 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1743 if (!res)
1744 return -ENXIO;
1745
1746 if (!request_mem_region(res->start, resource_size(res), driver_name)) {
1747 DBG("someone's using UDC memory\n");
1748 return -EBUSY;
1749 }
1750
1751 /* init software state */
1752 udc = &controller;
1753 udc->gadget.dev.parent = dev;
1754 udc->board = *(struct at91_udc_data *) dev->platform_data;
1755 udc->pdev = pdev;
1756 udc->enabled = 0;
1757 spin_lock_init(&udc->lock);
1758
1759 /* rm9200 needs manual D+ pullup; off by default */
1760 if (cpu_is_at91rm9200()) {
1761 if (udc->board.pullup_pin <= 0) {
1762 DBG("no D+ pullup?\n");
1763 retval = -ENODEV;
1764 goto fail0;
1765 }
1766 retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
1767 if (retval) {
1768 DBG("D+ pullup is busy\n");
1769 goto fail0;
1770 }
1771 gpio_direction_output(udc->board.pullup_pin,
1772 udc->board.pullup_active_low);
1773 }
1774
1775 /* newer chips have more FIFO memory than rm9200 */
1776 if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
1777 udc->ep[0].maxpacket = 64;
1778 udc->ep[3].maxpacket = 64;
1779 udc->ep[4].maxpacket = 512;
1780 udc->ep[5].maxpacket = 512;
1781 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1782 udc->ep[3].maxpacket = 64;
1783 } else if (cpu_is_at91sam9263()) {
1784 udc->ep[0].maxpacket = 64;
1785 udc->ep[3].maxpacket = 64;
1786 }
1787
1788 udc->udp_baseaddr = ioremap(res->start, resource_size(res));
1789 if (!udc->udp_baseaddr) {
1790 retval = -ENOMEM;
1791 goto fail0a;
1792 }
1793
1794 udc_reinit(udc);
1795
1796 /* get interface and function clocks */
1797 udc->iclk = clk_get(dev, "udc_clk");
1798 udc->fclk = clk_get(dev, "udpck");
1799 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
1800 DBG("clocks missing\n");
1801 retval = -ENODEV;
1802 /* NOTE: we "know" here that refcounts on these are NOPs */
1803 goto fail0b;
1804 }
1805
1806 retval = device_register(&udc->gadget.dev);
1807 if (retval < 0) {
1808 put_device(&udc->gadget.dev);
1809 goto fail0b;
1810 }
1811
1812 /* don't do anything until we have both gadget driver and VBUS */
1813 clk_enable(udc->iclk);
1814 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1815 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1816 /* Clear all pending interrupts - UDP may be used by bootloader. */
1817 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1818 clk_disable(udc->iclk);
1819
1820 /* request UDC and maybe VBUS irqs */
1821 udc->udp_irq = platform_get_irq(pdev, 0);
1822 retval = request_irq(udc->udp_irq, at91_udc_irq,
1823 IRQF_DISABLED, driver_name, udc);
1824 if (retval < 0) {
1825 DBG("request irq %d failed\n", udc->udp_irq);
1826 goto fail1;
1827 }
1828 if (udc->board.vbus_pin > 0) {
1829 retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
1830 if (retval < 0) {
1831 DBG("request vbus pin failed\n");
1832 goto fail2;
1833 }
1834 gpio_direction_input(udc->board.vbus_pin);
1835
1836 /*
1837 * Get the initial state of VBUS - we cannot expect
1838 * a pending interrupt.
1839 */
1840 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1841 udc->board.vbus_active_low;
1842
1843 if (udc->board.vbus_polled) {
1844 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1845 setup_timer(&udc->vbus_timer, at91_vbus_timer,
1846 (unsigned long)udc);
1847 mod_timer(&udc->vbus_timer,
1848 jiffies + VBUS_POLL_TIMEOUT);
1849 } else {
1850 if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
1851 IRQF_DISABLED, driver_name, udc)) {
1852 DBG("request vbus irq %d failed\n",
1853 udc->board.vbus_pin);
1854 retval = -EBUSY;
1855 goto fail3;
1856 }
1857 }
1858 } else {
1859 DBG("no VBUS detection, assuming always-on\n");
1860 udc->vbus = 1;
1861 }
1862 retval = usb_add_gadget_udc(dev, &udc->gadget);
1863 if (retval)
1864 goto fail4;
1865 dev_set_drvdata(dev, udc);
1866 device_init_wakeup(dev, 1);
1867 create_debug_file(udc);
1868
1869 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1870 return 0;
1871fail4:
1872 if (udc->board.vbus_pin > 0 && !udc->board.vbus_polled)
1873 free_irq(udc->board.vbus_pin, udc);
1874fail3:
1875 if (udc->board.vbus_pin > 0)
1876 gpio_free(udc->board.vbus_pin);
1877fail2:
1878 free_irq(udc->udp_irq, udc);
1879fail1:
1880 device_unregister(&udc->gadget.dev);
1881fail0b:
1882 iounmap(udc->udp_baseaddr);
1883fail0a:
1884 if (cpu_is_at91rm9200())
1885 gpio_free(udc->board.pullup_pin);
1886fail0:
1887 release_mem_region(res->start, resource_size(res));
1888 DBG("%s probe failed, %d\n", driver_name, retval);
1889 return retval;
1890}
1891
1892static int __exit at91udc_remove(struct platform_device *pdev)
1893{
1894 struct at91_udc *udc = platform_get_drvdata(pdev);
1895 struct resource *res;
1896 unsigned long flags;
1897
1898 DBG("remove\n");
1899
1900 usb_del_gadget_udc(&udc->gadget);
1901 if (udc->driver)
1902 return -EBUSY;
1903
1904 spin_lock_irqsave(&udc->lock, flags);
1905 pullup(udc, 0);
1906 spin_unlock_irqrestore(&udc->lock, flags);
1907
1908 device_init_wakeup(&pdev->dev, 0);
1909 remove_debug_file(udc);
1910 if (udc->board.vbus_pin > 0) {
1911 free_irq(udc->board.vbus_pin, udc);
1912 gpio_free(udc->board.vbus_pin);
1913 }
1914 free_irq(udc->udp_irq, udc);
1915 device_unregister(&udc->gadget.dev);
1916
1917 iounmap(udc->udp_baseaddr);
1918
1919 if (cpu_is_at91rm9200())
1920 gpio_free(udc->board.pullup_pin);
1921
1922 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1923 release_mem_region(res->start, resource_size(res));
1924
1925 clk_put(udc->iclk);
1926 clk_put(udc->fclk);
1927
1928 return 0;
1929}
1930
1931#ifdef CONFIG_PM
1932static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1933{
1934 struct at91_udc *udc = platform_get_drvdata(pdev);
1935 int wake = udc->driver && device_may_wakeup(&pdev->dev);
1936 unsigned long flags;
1937
1938 /* Unless we can act normally to the host (letting it wake us up
1939 * whenever it has work for us) force disconnect. Wakeup requires
1940 * PLLB for USB events (signaling for reset, wakeup, or incoming
1941 * tokens) and VBUS irqs (on systems which support them).
1942 */
1943 if ((!udc->suspended && udc->addr)
1944 || !wake
1945 || at91_suspend_entering_slow_clock()) {
1946 spin_lock_irqsave(&udc->lock, flags);
1947 pullup(udc, 0);
1948 wake = 0;
1949 spin_unlock_irqrestore(&udc->lock, flags);
1950 } else
1951 enable_irq_wake(udc->udp_irq);
1952
1953 udc->active_suspend = wake;
1954 if (udc->board.vbus_pin > 0 && !udc->board.vbus_polled && wake)
1955 enable_irq_wake(udc->board.vbus_pin);
1956 return 0;
1957}
1958
1959static int at91udc_resume(struct platform_device *pdev)
1960{
1961 struct at91_udc *udc = platform_get_drvdata(pdev);
1962 unsigned long flags;
1963
1964 if (udc->board.vbus_pin > 0 && !udc->board.vbus_polled &&
1965 udc->active_suspend)
1966 disable_irq_wake(udc->board.vbus_pin);
1967
1968 /* maybe reconnect to host; if so, clocks on */
1969 if (udc->active_suspend)
1970 disable_irq_wake(udc->udp_irq);
1971 else {
1972 spin_lock_irqsave(&udc->lock, flags);
1973 pullup(udc, 1);
1974 spin_unlock_irqrestore(&udc->lock, flags);
1975 }
1976 return 0;
1977}
1978#else
1979#define at91udc_suspend NULL
1980#define at91udc_resume NULL
1981#endif
1982
1983static struct platform_driver at91_udc_driver = {
1984 .remove = __exit_p(at91udc_remove),
1985 .shutdown = at91udc_shutdown,
1986 .suspend = at91udc_suspend,
1987 .resume = at91udc_resume,
1988 .driver = {
1989 .name = (char *) driver_name,
1990 .owner = THIS_MODULE,
1991 },
1992};
1993
1994static int __init udc_init_module(void)
1995{
1996 return platform_driver_probe(&at91_udc_driver, at91udc_probe);
1997}
1998module_init(udc_init_module);
1999
2000static void __exit udc_exit_module(void)
2001{
2002 platform_driver_unregister(&at91_udc_driver);
2003}
2004module_exit(udc_exit_module);
2005
2006MODULE_DESCRIPTION("AT91 udc driver");
2007MODULE_AUTHOR("Thomas Rathbone, David Brownell");
2008MODULE_LICENSE("GPL");
2009MODULE_ALIAS("platform:at91_udc");