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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / usb / gadget / at91_udc.c
blobcea8c20a142555af1a1c01c5c9a8b9ef1ce11b65
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/list.h>
25 #include <linux/interrupt.h>
26 #include <linux/proc_fs.h>
27 #include <linux/prefetch.h>
28 #include <linux/clk.h>
29 #include <linux/usb/ch9.h>
30 #include <linux/usb/gadget.h>
31 #include <linux/of.h>
32 #include <linux/of_gpio.h>
33 #include <linux/platform_data/atmel.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/cpu.h>
42 #include <mach/at91sam9261_matrix.h>
43 #include <mach/at91_matrix.h>
44
45 #include "at91_udc.h"
46
47
48 /*
49 * This controller is simple and PIO-only. It's used in many AT91-series
50 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
51 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
52 *
53 * This driver expects the board has been wired with two GPIOs supporting
54 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
55 * testing hasn't covered such cases.)
56 *
57 * The pullup is most important (so it's integrated on sam926x parts). It
58 * provides software control over whether the host enumerates the device.
59 *
60 * The VBUS sensing helps during enumeration, and allows both USB clocks
61 * (and the transceiver) to stay gated off until they're necessary, saving
62 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
63 * it may also be gated off by software during some Linux sleep states.
64 */
65
66 #define DRIVER_VERSION "3 May 2006"
67
68 static const char driver_name [] = "at91_udc";
69 static const char ep0name[] = "ep0";
70
71 #define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
72
73 #define at91_udp_read(udc, reg) \
74 __raw_readl((udc)->udp_baseaddr + (reg))
75 #define at91_udp_write(udc, reg, val) \
76 __raw_writel((val), (udc)->udp_baseaddr + (reg))
77
78 /*-------------------------------------------------------------------------*/
79
80 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
81
82 #include <linux/seq_file.h>
83
84 static const char debug_filename[] = "driver/udc";
85
86 #define FOURBITS "%s%s%s%s"
87 #define EIGHTBITS FOURBITS FOURBITS
88
89 static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
90 {
91 static char *types[] = {
92 "control", "out-iso", "out-bulk", "out-int",
93 "BOGUS", "in-iso", "in-bulk", "in-int"};
94
95 u32 csr;
96 struct at91_request *req;
97 unsigned long flags;
98 struct at91_udc *udc = ep->udc;
99
100 spin_lock_irqsave(&udc->lock, flags);
101
102 csr = __raw_readl(ep->creg);
103
104 /* NOTE: not collecting per-endpoint irq statistics... */
105
106 seq_printf(s, "\n");
107 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
108 ep->ep.name, ep->ep.maxpacket,
109 ep->is_in ? "in" : "out",
110 ep->is_iso ? " iso" : "",
111 ep->is_pingpong
112 ? (ep->fifo_bank ? "pong" : "ping")
113 : "",
114 ep->stopped ? " stopped" : "");
115 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
116 csr,
117 (csr & 0x07ff0000) >> 16,
118 (csr & (1 << 15)) ? "enabled" : "disabled",
119 (csr & (1 << 11)) ? "DATA1" : "DATA0",
120 types[(csr & 0x700) >> 8],
121
122 /* iff type is control then print current direction */
123 (!(csr & 0x700))
124 ? ((csr & (1 << 7)) ? " IN" : " OUT")
125 : "",
126 (csr & (1 << 6)) ? " rxdatabk1" : "",
127 (csr & (1 << 5)) ? " forcestall" : "",
128 (csr & (1 << 4)) ? " txpktrdy" : "",
129
130 (csr & (1 << 3)) ? " stallsent" : "",
131 (csr & (1 << 2)) ? " rxsetup" : "",
132 (csr & (1 << 1)) ? " rxdatabk0" : "",
133 (csr & (1 << 0)) ? " txcomp" : "");
134 if (list_empty (&ep->queue))
135 seq_printf(s, "\t(queue empty)\n");
136
137 else list_for_each_entry (req, &ep->queue, queue) {
138 unsigned length = req->req.actual;
139
140 seq_printf(s, "\treq %p len %d/%d buf %p\n",
141 &req->req, length,
142 req->req.length, req->req.buf);
143 }
144 spin_unlock_irqrestore(&udc->lock, flags);
145 }
146
147 static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
148 {
149 int i;
150
151 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
152 (mask & (1 << 13)) ? " wakeup" : "",
153 (mask & (1 << 12)) ? " endbusres" : "",
154
155 (mask & (1 << 11)) ? " sofint" : "",
156 (mask & (1 << 10)) ? " extrsm" : "",
157 (mask & (1 << 9)) ? " rxrsm" : "",
158 (mask & (1 << 8)) ? " rxsusp" : "");
159 for (i = 0; i < 8; i++) {
160 if (mask & (1 << i))
161 seq_printf(s, " ep%d", i);
162 }
163 seq_printf(s, "\n");
164 }
165
166 static int proc_udc_show(struct seq_file *s, void *unused)
167 {
168 struct at91_udc *udc = s->private;
169 struct at91_ep *ep;
170 u32 tmp;
171
172 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
173
174 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
175 udc->vbus ? "present" : "off",
176 udc->enabled
177 ? (udc->vbus ? "active" : "enabled")
178 : "disabled",
179 udc->selfpowered ? "self" : "VBUS",
180 udc->suspended ? ", suspended" : "",
181 udc->driver ? udc->driver->driver.name : "(none)");
182
183 /* don't access registers when interface isn't clocked */
184 if (!udc->clocked) {
185 seq_printf(s, "(not clocked)\n");
186 return 0;
187 }
188
189 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
190 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
191 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
192 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
193 (tmp & AT91_UDP_NUM));
194
195 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
196 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
197 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
198 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
199 (tmp & AT91_UDP_ESR) ? " esr" : "",
200 (tmp & AT91_UDP_CONFG) ? " confg" : "",
201 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
202
203 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
204 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
205 (tmp & AT91_UDP_FEN) ? " fen" : "",
206 (tmp & AT91_UDP_FADD));
207
208 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
209 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
210
211 if (udc->enabled && udc->vbus) {
212 proc_ep_show(s, &udc->ep[0]);
213 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
214 if (ep->ep.desc)
215 proc_ep_show(s, ep);
216 }
217 }
218 return 0;
219 }
220
221 static int proc_udc_open(struct inode *inode, struct file *file)
222 {
223 return single_open(file, proc_udc_show, PDE_DATA(inode));
224 }
225
226 static const struct file_operations proc_ops = {
227 .owner = THIS_MODULE,
228 .open = proc_udc_open,
229 .read = seq_read,
230 .llseek = seq_lseek,
231 .release = single_release,
232 };
233
234 static void create_debug_file(struct at91_udc *udc)
235 {
236 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
237 }
238
239 static void remove_debug_file(struct at91_udc *udc)
240 {
241 if (udc->pde)
242 remove_proc_entry(debug_filename, NULL);
243 }
244
245 #else
246
247 static inline void create_debug_file(struct at91_udc *udc) {}
248 static inline void remove_debug_file(struct at91_udc *udc) {}
249
250 #endif
251
252
253 /*-------------------------------------------------------------------------*/
254
255 static void done(struct at91_ep *ep, struct at91_request *req, int status)
256 {
257 unsigned stopped = ep->stopped;
258 struct at91_udc *udc = ep->udc;
259
260 list_del_init(&req->queue);
261 if (req->req.status == -EINPROGRESS)
262 req->req.status = status;
263 else
264 status = req->req.status;
265 if (status && status != -ESHUTDOWN)
266 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
267
268 ep->stopped = 1;
269 spin_unlock(&udc->lock);
270 req->req.complete(&ep->ep, &req->req);
271 spin_lock(&udc->lock);
272 ep->stopped = stopped;
273
274 /* ep0 is always ready; other endpoints need a non-empty queue */
275 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
276 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
277 }
278
279 /*-------------------------------------------------------------------------*/
280
281 /* bits indicating OUT fifo has data ready */
282 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
283
284 /*
285 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
286 * back most of the value you just read (because of side effects, including
287 * bits that may change after reading and before writing).
288 *
289 * Except when changing a specific bit, always write values which:
290 * - clear SET_FX bits (setting them could change something)
291 * - set CLR_FX bits (clearing them could change something)
292 *
293 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
294 * that shouldn't normally be changed.
295 *
296 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
297 * implying a need to wait for one write to complete (test relevant bits)
298 * before starting the next write. This shouldn't be an issue given how
299 * infrequently we write, except maybe for write-then-read idioms.
300 */
301 #define SET_FX (AT91_UDP_TXPKTRDY)
302 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
303 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
304
305 /* pull OUT packet data from the endpoint's fifo */
306 static int read_fifo (struct at91_ep *ep, struct at91_request *req)
307 {
308 u32 __iomem *creg = ep->creg;
309 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
310 u32 csr;
311 u8 *buf;
312 unsigned int count, bufferspace, is_done;
313
314 buf = req->req.buf + req->req.actual;
315 bufferspace = req->req.length - req->req.actual;
316
317 /*
318 * there might be nothing to read if ep_queue() calls us,
319 * or if we already emptied both pingpong buffers
320 */
321 rescan:
322 csr = __raw_readl(creg);
323 if ((csr & RX_DATA_READY) == 0)
324 return 0;
325
326 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
327 if (count > ep->ep.maxpacket)
328 count = ep->ep.maxpacket;
329 if (count > bufferspace) {
330 DBG("%s buffer overflow\n", ep->ep.name);
331 req->req.status = -EOVERFLOW;
332 count = bufferspace;
333 }
334 __raw_readsb(dreg, buf, count);
335
336 /* release and swap pingpong mem bank */
337 csr |= CLR_FX;
338 if (ep->is_pingpong) {
339 if (ep->fifo_bank == 0) {
340 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
341 ep->fifo_bank = 1;
342 } else {
343 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
344 ep->fifo_bank = 0;
345 }
346 } else
347 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
348 __raw_writel(csr, creg);
349
350 req->req.actual += count;
351 is_done = (count < ep->ep.maxpacket);
352 if (count == bufferspace)
353 is_done = 1;
354
355 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
356 is_done ? " (done)" : "");
357
358 /*
359 * avoid extra trips through IRQ logic for packets already in
360 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
361 */
362 if (is_done)
363 done(ep, req, 0);
364 else if (ep->is_pingpong) {
365 /*
366 * One dummy read to delay the code because of a HW glitch:
367 * CSR returns bad RXCOUNT when read too soon after updating
368 * RX_DATA_BK flags.
369 */
370 csr = __raw_readl(creg);
371
372 bufferspace -= count;
373 buf += count;
374 goto rescan;
375 }
376
377 return is_done;
378 }
379
380 /* load fifo for an IN packet */
381 static int write_fifo(struct at91_ep *ep, struct at91_request *req)
382 {
383 u32 __iomem *creg = ep->creg;
384 u32 csr = __raw_readl(creg);
385 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
386 unsigned total, count, is_last;
387 u8 *buf;
388
389 /*
390 * TODO: allow for writing two packets to the fifo ... that'll
391 * reduce the amount of IN-NAKing, but probably won't affect
392 * throughput much. (Unlike preventing OUT-NAKing!)
393 */
394
395 /*
396 * If ep_queue() calls us, the queue is empty and possibly in
397 * odd states like TXCOMP not yet cleared (we do it, saving at
398 * least one IRQ) or the fifo not yet being free. Those aren't
399 * issues normally (IRQ handler fast path).
400 */
401 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
402 if (csr & AT91_UDP_TXCOMP) {
403 csr |= CLR_FX;
404 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
405 __raw_writel(csr, creg);
406 csr = __raw_readl(creg);
407 }
408 if (csr & AT91_UDP_TXPKTRDY)
409 return 0;
410 }
411
412 buf = req->req.buf + req->req.actual;
413 prefetch(buf);
414 total = req->req.length - req->req.actual;
415 if (ep->ep.maxpacket < total) {
416 count = ep->ep.maxpacket;
417 is_last = 0;
418 } else {
419 count = total;
420 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
421 }
422
423 /*
424 * Write the packet, maybe it's a ZLP.
425 *
426 * NOTE: incrementing req->actual before we receive the ACK means
427 * gadget driver IN bytecounts can be wrong in fault cases. That's
428 * fixable with PIO drivers like this one (save "count" here, and
429 * do the increment later on TX irq), but not for most DMA hardware.
430 *
431 * So all gadget drivers must accept that potential error. Some
432 * hardware supports precise fifo status reporting, letting them
433 * recover when the actual bytecount matters (e.g. for USB Test
434 * and Measurement Class devices).
435 */
436 __raw_writesb(dreg, buf, count);
437 csr &= ~SET_FX;
438 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
439 __raw_writel(csr, creg);
440 req->req.actual += count;
441
442 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
443 is_last ? " (done)" : "");
444 if (is_last)
445 done(ep, req, 0);
446 return is_last;
447 }
448
449 static void nuke(struct at91_ep *ep, int status)
450 {
451 struct at91_request *req;
452
453 /* terminate any request in the queue */
454 ep->stopped = 1;
455 if (list_empty(&ep->queue))
456 return;
457
458 VDBG("%s %s\n", __func__, ep->ep.name);
459 while (!list_empty(&ep->queue)) {
460 req = list_entry(ep->queue.next, struct at91_request, queue);
461 done(ep, req, status);
462 }
463 }
464
465 /*-------------------------------------------------------------------------*/
466
467 static int at91_ep_enable(struct usb_ep *_ep,
468 const struct usb_endpoint_descriptor *desc)
469 {
470 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
471 struct at91_udc *udc;
472 u16 maxpacket;
473 u32 tmp;
474 unsigned long flags;
475
476 if (!_ep || !ep
477 || !desc || _ep->name == ep0name
478 || desc->bDescriptorType != USB_DT_ENDPOINT
479 || (maxpacket = usb_endpoint_maxp(desc)) == 0
480 || maxpacket > ep->maxpacket) {
481 DBG("bad ep or descriptor\n");
482 return -EINVAL;
483 }
484
485 udc = ep->udc;
486 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
487 DBG("bogus device state\n");
488 return -ESHUTDOWN;
489 }
490
491 tmp = usb_endpoint_type(desc);
492 switch (tmp) {
493 case USB_ENDPOINT_XFER_CONTROL:
494 DBG("only one control endpoint\n");
495 return -EINVAL;
496 case USB_ENDPOINT_XFER_INT:
497 if (maxpacket > 64)
498 goto bogus_max;
499 break;
500 case USB_ENDPOINT_XFER_BULK:
501 switch (maxpacket) {
502 case 8:
503 case 16:
504 case 32:
505 case 64:
506 goto ok;
507 }
508 bogus_max:
509 DBG("bogus maxpacket %d\n", maxpacket);
510 return -EINVAL;
511 case USB_ENDPOINT_XFER_ISOC:
512 if (!ep->is_pingpong) {
513 DBG("iso requires double buffering\n");
514 return -EINVAL;
515 }
516 break;
517 }
518
519 ok:
520 spin_lock_irqsave(&udc->lock, flags);
521
522 /* initialize endpoint to match this descriptor */
523 ep->is_in = usb_endpoint_dir_in(desc);
524 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
525 ep->stopped = 0;
526 if (ep->is_in)
527 tmp |= 0x04;
528 tmp <<= 8;
529 tmp |= AT91_UDP_EPEDS;
530 __raw_writel(tmp, ep->creg);
531
532 ep->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
545 static 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
578 static struct usb_request *
579 at91_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
591 static 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
600 static 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) {
667 ep0_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 }
695 done:
696 spin_unlock_irqrestore(&udc->lock, flags);
697 return (status < 0) ? status : 0;
698 }
699
700 static 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
730 static 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
772 static 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
785 static 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
794 static 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
815 done:
816 spin_unlock_irqrestore(&udc->lock, flags);
817 return status;
818 }
819
820 /* reinit == restore initial software state */
821 static 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 usb_ep_set_maxpacket_limit(&ep->ep, 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
843 static 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
867 static void clk_on(struct at91_udc *udc)
868 {
869 if (udc->clocked)
870 return;
871 udc->clocked = 1;
872
873 if (IS_ENABLED(CONFIG_COMMON_CLK)) {
874 clk_set_rate(udc->uclk, 48000000);
875 clk_prepare_enable(udc->uclk);
876 }
877 clk_prepare_enable(udc->iclk);
878 clk_prepare_enable(udc->fclk);
879 }
880
881 static void clk_off(struct at91_udc *udc)
882 {
883 if (!udc->clocked)
884 return;
885 udc->clocked = 0;
886 udc->gadget.speed = USB_SPEED_UNKNOWN;
887 clk_disable_unprepare(udc->fclk);
888 clk_disable_unprepare(udc->iclk);
889 if (IS_ENABLED(CONFIG_COMMON_CLK))
890 clk_disable_unprepare(udc->uclk);
891 }
892
893 /*
894 * activate/deactivate link with host; minimize power usage for
895 * inactive links by cutting clocks and transceiver power.
896 */
897 static void pullup(struct at91_udc *udc, int is_on)
898 {
899 int active = !udc->board.pullup_active_low;
900
901 if (!udc->enabled || !udc->vbus)
902 is_on = 0;
903 DBG("%sactive\n", is_on ? "" : "in");
904
905 if (is_on) {
906 clk_on(udc);
907 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
908 at91_udp_write(udc, AT91_UDP_TXVC, 0);
909 if (cpu_is_at91rm9200())
910 gpio_set_value(udc->board.pullup_pin, active);
911 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
912 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
913
914 txvc |= AT91_UDP_TXVC_PUON;
915 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
916 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
917 u32 usbpucr;
918
919 usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
920 usbpucr |= AT91_MATRIX_USBPUCR_PUON;
921 at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
922 }
923 } else {
924 stop_activity(udc);
925 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
926 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
927 if (cpu_is_at91rm9200())
928 gpio_set_value(udc->board.pullup_pin, !active);
929 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
930 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
931
932 txvc &= ~AT91_UDP_TXVC_PUON;
933 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
934 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
935 u32 usbpucr;
936
937 usbpucr = at91_matrix_read(AT91_MATRIX_USBPUCR);
938 usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
939 at91_matrix_write(AT91_MATRIX_USBPUCR, usbpucr);
940 }
941 clk_off(udc);
942 }
943 }
944
945 /* vbus is here! turn everything on that's ready */
946 static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
947 {
948 struct at91_udc *udc = to_udc(gadget);
949 unsigned long flags;
950
951 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
952 spin_lock_irqsave(&udc->lock, flags);
953 udc->vbus = (is_active != 0);
954 if (udc->driver)
955 pullup(udc, is_active);
956 else
957 pullup(udc, 0);
958 spin_unlock_irqrestore(&udc->lock, flags);
959 return 0;
960 }
961
962 static int at91_pullup(struct usb_gadget *gadget, int is_on)
963 {
964 struct at91_udc *udc = to_udc(gadget);
965 unsigned long flags;
966
967 spin_lock_irqsave(&udc->lock, flags);
968 udc->enabled = is_on = !!is_on;
969 pullup(udc, is_on);
970 spin_unlock_irqrestore(&udc->lock, flags);
971 return 0;
972 }
973
974 static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
975 {
976 struct at91_udc *udc = to_udc(gadget);
977 unsigned long flags;
978
979 spin_lock_irqsave(&udc->lock, flags);
980 udc->selfpowered = (is_on != 0);
981 spin_unlock_irqrestore(&udc->lock, flags);
982 return 0;
983 }
984
985 static int at91_start(struct usb_gadget *gadget,
986 struct usb_gadget_driver *driver);
987 static int at91_stop(struct usb_gadget *gadget,
988 struct usb_gadget_driver *driver);
989 static const struct usb_gadget_ops at91_udc_ops = {
990 .get_frame = at91_get_frame,
991 .wakeup = at91_wakeup,
992 .set_selfpowered = at91_set_selfpowered,
993 .vbus_session = at91_vbus_session,
994 .pullup = at91_pullup,
995 .udc_start = at91_start,
996 .udc_stop = at91_stop,
997
998 /*
999 * VBUS-powered devices may also also want to support bigger
1000 * power budgets after an appropriate SET_CONFIGURATION.
1001 */
1002 /* .vbus_power = at91_vbus_power, */
1003 };
1004
1005 /*-------------------------------------------------------------------------*/
1006
1007 static int handle_ep(struct at91_ep *ep)
1008 {
1009 struct at91_request *req;
1010 u32 __iomem *creg = ep->creg;
1011 u32 csr = __raw_readl(creg);
1012
1013 if (!list_empty(&ep->queue))
1014 req = list_entry(ep->queue.next,
1015 struct at91_request, queue);
1016 else
1017 req = NULL;
1018
1019 if (ep->is_in) {
1020 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1021 csr |= CLR_FX;
1022 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1023 __raw_writel(csr, creg);
1024 }
1025 if (req)
1026 return write_fifo(ep, req);
1027
1028 } else {
1029 if (csr & AT91_UDP_STALLSENT) {
1030 /* STALLSENT bit == ISOERR */
1031 if (ep->is_iso && req)
1032 req->req.status = -EILSEQ;
1033 csr |= CLR_FX;
1034 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1035 __raw_writel(csr, creg);
1036 csr = __raw_readl(creg);
1037 }
1038 if (req && (csr & RX_DATA_READY))
1039 return read_fifo(ep, req);
1040 }
1041 return 0;
1042 }
1043
1044 union setup {
1045 u8 raw[8];
1046 struct usb_ctrlrequest r;
1047 };
1048
1049 static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1050 {
1051 u32 __iomem *creg = ep->creg;
1052 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1053 unsigned rxcount, i = 0;
1054 u32 tmp;
1055 union setup pkt;
1056 int status = 0;
1057
1058 /* read and ack SETUP; hard-fail for bogus packets */
1059 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1060 if (likely(rxcount == 8)) {
1061 while (rxcount--)
1062 pkt.raw[i++] = __raw_readb(dreg);
1063 if (pkt.r.bRequestType & USB_DIR_IN) {
1064 csr |= AT91_UDP_DIR;
1065 ep->is_in = 1;
1066 } else {
1067 csr &= ~AT91_UDP_DIR;
1068 ep->is_in = 0;
1069 }
1070 } else {
1071 /* REVISIT this happens sometimes under load; why?? */
1072 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1073 status = -EINVAL;
1074 }
1075 csr |= CLR_FX;
1076 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1077 __raw_writel(csr, creg);
1078 udc->wait_for_addr_ack = 0;
1079 udc->wait_for_config_ack = 0;
1080 ep->stopped = 0;
1081 if (unlikely(status != 0))
1082 goto stall;
1083
1084 #define w_index le16_to_cpu(pkt.r.wIndex)
1085 #define w_value le16_to_cpu(pkt.r.wValue)
1086 #define w_length le16_to_cpu(pkt.r.wLength)
1087
1088 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1089 pkt.r.bRequestType, pkt.r.bRequest,
1090 w_value, w_index, w_length);
1091
1092 /*
1093 * A few standard requests get handled here, ones that touch
1094 * hardware ... notably for device and endpoint features.
1095 */
1096 udc->req_pending = 1;
1097 csr = __raw_readl(creg);
1098 csr |= CLR_FX;
1099 csr &= ~SET_FX;
1100 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1101
1102 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1103 | USB_REQ_SET_ADDRESS:
1104 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1105 udc->addr = w_value;
1106 udc->wait_for_addr_ack = 1;
1107 udc->req_pending = 0;
1108 /* FADDR is set later, when we ack host STATUS */
1109 return;
1110
1111 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1112 | USB_REQ_SET_CONFIGURATION:
1113 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1114 if (pkt.r.wValue)
1115 udc->wait_for_config_ack = (tmp == 0);
1116 else
1117 udc->wait_for_config_ack = (tmp != 0);
1118 if (udc->wait_for_config_ack)
1119 VDBG("wait for config\n");
1120 /* CONFG is toggled later, if gadget driver succeeds */
1121 break;
1122
1123 /*
1124 * Hosts may set or clear remote wakeup status, and
1125 * devices may report they're VBUS powered.
1126 */
1127 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1128 | USB_REQ_GET_STATUS:
1129 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1130 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1131 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1132 PACKET("get device status\n");
1133 __raw_writeb(tmp, dreg);
1134 __raw_writeb(0, dreg);
1135 goto write_in;
1136 /* then STATUS starts later, automatically */
1137 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1138 | USB_REQ_SET_FEATURE:
1139 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1140 goto stall;
1141 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1142 tmp |= AT91_UDP_ESR;
1143 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1144 goto succeed;
1145 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1146 | USB_REQ_CLEAR_FEATURE:
1147 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1148 goto stall;
1149 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1150 tmp &= ~AT91_UDP_ESR;
1151 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1152 goto succeed;
1153
1154 /*
1155 * Interfaces have no feature settings; this is pretty useless.
1156 * we won't even insist the interface exists...
1157 */
1158 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1159 | USB_REQ_GET_STATUS:
1160 PACKET("get interface status\n");
1161 __raw_writeb(0, dreg);
1162 __raw_writeb(0, dreg);
1163 goto write_in;
1164 /* then STATUS starts later, automatically */
1165 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1166 | USB_REQ_SET_FEATURE:
1167 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1168 | USB_REQ_CLEAR_FEATURE:
1169 goto stall;
1170
1171 /*
1172 * Hosts may clear bulk/intr endpoint halt after the gadget
1173 * driver sets it (not widely used); or set it (for testing)
1174 */
1175 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1176 | USB_REQ_GET_STATUS:
1177 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1178 ep = &udc->ep[tmp];
1179 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1180 goto stall;
1181
1182 if (tmp) {
1183 if ((w_index & USB_DIR_IN)) {
1184 if (!ep->is_in)
1185 goto stall;
1186 } else if (ep->is_in)
1187 goto stall;
1188 }
1189 PACKET("get %s status\n", ep->ep.name);
1190 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1191 tmp = (1 << USB_ENDPOINT_HALT);
1192 else
1193 tmp = 0;
1194 __raw_writeb(tmp, dreg);
1195 __raw_writeb(0, dreg);
1196 goto write_in;
1197 /* then STATUS starts later, automatically */
1198 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1199 | USB_REQ_SET_FEATURE:
1200 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1201 ep = &udc->ep[tmp];
1202 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1203 goto stall;
1204 if (!ep->ep.desc || ep->is_iso)
1205 goto stall;
1206 if ((w_index & USB_DIR_IN)) {
1207 if (!ep->is_in)
1208 goto stall;
1209 } else if (ep->is_in)
1210 goto stall;
1211
1212 tmp = __raw_readl(ep->creg);
1213 tmp &= ~SET_FX;
1214 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1215 __raw_writel(tmp, ep->creg);
1216 goto succeed;
1217 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1218 | USB_REQ_CLEAR_FEATURE:
1219 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1220 ep = &udc->ep[tmp];
1221 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1222 goto stall;
1223 if (tmp == 0)
1224 goto succeed;
1225 if (!ep->ep.desc || ep->is_iso)
1226 goto stall;
1227 if ((w_index & USB_DIR_IN)) {
1228 if (!ep->is_in)
1229 goto stall;
1230 } else if (ep->is_in)
1231 goto stall;
1232
1233 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1234 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1235 tmp = __raw_readl(ep->creg);
1236 tmp |= CLR_FX;
1237 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1238 __raw_writel(tmp, ep->creg);
1239 if (!list_empty(&ep->queue))
1240 handle_ep(ep);
1241 goto succeed;
1242 }
1243
1244 #undef w_value
1245 #undef w_index
1246 #undef w_length
1247
1248 /* pass request up to the gadget driver */
1249 if (udc->driver) {
1250 spin_unlock(&udc->lock);
1251 status = udc->driver->setup(&udc->gadget, &pkt.r);
1252 spin_lock(&udc->lock);
1253 }
1254 else
1255 status = -ENODEV;
1256 if (status < 0) {
1257 stall:
1258 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1259 pkt.r.bRequestType, pkt.r.bRequest, status);
1260 csr |= AT91_UDP_FORCESTALL;
1261 __raw_writel(csr, creg);
1262 udc->req_pending = 0;
1263 }
1264 return;
1265
1266 succeed:
1267 /* immediate successful (IN) STATUS after zero length DATA */
1268 PACKET("ep0 in/status\n");
1269 write_in:
1270 csr |= AT91_UDP_TXPKTRDY;
1271 __raw_writel(csr, creg);
1272 udc->req_pending = 0;
1273 }
1274
1275 static void handle_ep0(struct at91_udc *udc)
1276 {
1277 struct at91_ep *ep0 = &udc->ep[0];
1278 u32 __iomem *creg = ep0->creg;
1279 u32 csr = __raw_readl(creg);
1280 struct at91_request *req;
1281
1282 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1283 nuke(ep0, -EPROTO);
1284 udc->req_pending = 0;
1285 csr |= CLR_FX;
1286 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1287 __raw_writel(csr, creg);
1288 VDBG("ep0 stalled\n");
1289 csr = __raw_readl(creg);
1290 }
1291 if (csr & AT91_UDP_RXSETUP) {
1292 nuke(ep0, 0);
1293 udc->req_pending = 0;
1294 handle_setup(udc, ep0, csr);
1295 return;
1296 }
1297
1298 if (list_empty(&ep0->queue))
1299 req = NULL;
1300 else
1301 req = list_entry(ep0->queue.next, struct at91_request, queue);
1302
1303 /* host ACKed an IN packet that we sent */
1304 if (csr & AT91_UDP_TXCOMP) {
1305 csr |= CLR_FX;
1306 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1307
1308 /* write more IN DATA? */
1309 if (req && ep0->is_in) {
1310 if (handle_ep(ep0))
1311 udc->req_pending = 0;
1312
1313 /*
1314 * Ack after:
1315 * - last IN DATA packet (including GET_STATUS)
1316 * - IN/STATUS for OUT DATA
1317 * - IN/STATUS for any zero-length DATA stage
1318 * except for the IN DATA case, the host should send
1319 * an OUT status later, which we'll ack.
1320 */
1321 } else {
1322 udc->req_pending = 0;
1323 __raw_writel(csr, creg);
1324
1325 /*
1326 * SET_ADDRESS takes effect only after the STATUS
1327 * (to the original address) gets acked.
1328 */
1329 if (udc->wait_for_addr_ack) {
1330 u32 tmp;
1331
1332 at91_udp_write(udc, AT91_UDP_FADDR,
1333 AT91_UDP_FEN | udc->addr);
1334 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1335 tmp &= ~AT91_UDP_FADDEN;
1336 if (udc->addr)
1337 tmp |= AT91_UDP_FADDEN;
1338 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1339
1340 udc->wait_for_addr_ack = 0;
1341 VDBG("address %d\n", udc->addr);
1342 }
1343 }
1344 }
1345
1346 /* OUT packet arrived ... */
1347 else if (csr & AT91_UDP_RX_DATA_BK0) {
1348 csr |= CLR_FX;
1349 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1350
1351 /* OUT DATA stage */
1352 if (!ep0->is_in) {
1353 if (req) {
1354 if (handle_ep(ep0)) {
1355 /* send IN/STATUS */
1356 PACKET("ep0 in/status\n");
1357 csr = __raw_readl(creg);
1358 csr &= ~SET_FX;
1359 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1360 __raw_writel(csr, creg);
1361 udc->req_pending = 0;
1362 }
1363 } else if (udc->req_pending) {
1364 /*
1365 * AT91 hardware has a hard time with this
1366 * "deferred response" mode for control-OUT
1367 * transfers. (For control-IN it's fine.)
1368 *
1369 * The normal solution leaves OUT data in the
1370 * fifo until the gadget driver is ready.
1371 * We couldn't do that here without disabling
1372 * the IRQ that tells about SETUP packets,
1373 * e.g. when the host gets impatient...
1374 *
1375 * Working around it by copying into a buffer
1376 * would almost be a non-deferred response,
1377 * except that it wouldn't permit reliable
1378 * stalling of the request. Instead, demand
1379 * that gadget drivers not use this mode.
1380 */
1381 DBG("no control-OUT deferred responses!\n");
1382 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1383 udc->req_pending = 0;
1384 }
1385
1386 /* STATUS stage for control-IN; ack. */
1387 } else {
1388 PACKET("ep0 out/status ACK\n");
1389 __raw_writel(csr, creg);
1390
1391 /* "early" status stage */
1392 if (req)
1393 done(ep0, req, 0);
1394 }
1395 }
1396 }
1397
1398 static irqreturn_t at91_udc_irq (int irq, void *_udc)
1399 {
1400 struct at91_udc *udc = _udc;
1401 u32 rescans = 5;
1402 int disable_clock = 0;
1403 unsigned long flags;
1404
1405 spin_lock_irqsave(&udc->lock, flags);
1406
1407 if (!udc->clocked) {
1408 clk_on(udc);
1409 disable_clock = 1;
1410 }
1411
1412 while (rescans--) {
1413 u32 status;
1414
1415 status = at91_udp_read(udc, AT91_UDP_ISR)
1416 & at91_udp_read(udc, AT91_UDP_IMR);
1417 if (!status)
1418 break;
1419
1420 /* USB reset irq: not maskable */
1421 if (status & AT91_UDP_ENDBUSRES) {
1422 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1423 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1424 /* Atmel code clears this irq twice */
1425 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1426 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1427 VDBG("end bus reset\n");
1428 udc->addr = 0;
1429 stop_activity(udc);
1430
1431 /* enable ep0 */
1432 at91_udp_write(udc, AT91_UDP_CSR(0),
1433 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1434 udc->gadget.speed = USB_SPEED_FULL;
1435 udc->suspended = 0;
1436 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1437
1438 /*
1439 * NOTE: this driver keeps clocks off unless the
1440 * USB host is present. That saves power, but for
1441 * boards that don't support VBUS detection, both
1442 * clocks need to be active most of the time.
1443 */
1444
1445 /* host initiated suspend (3+ms bus idle) */
1446 } else if (status & AT91_UDP_RXSUSP) {
1447 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1448 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1449 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1450 /* VDBG("bus suspend\n"); */
1451 if (udc->suspended)
1452 continue;
1453 udc->suspended = 1;
1454
1455 /*
1456 * NOTE: when suspending a VBUS-powered device, the
1457 * gadget driver should switch into slow clock mode
1458 * and then into standby to avoid drawing more than
1459 * 500uA power (2500uA for some high-power configs).
1460 */
1461 if (udc->driver && udc->driver->suspend) {
1462 spin_unlock(&udc->lock);
1463 udc->driver->suspend(&udc->gadget);
1464 spin_lock(&udc->lock);
1465 }
1466
1467 /* host initiated resume */
1468 } else if (status & AT91_UDP_RXRSM) {
1469 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1470 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1471 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1472 /* VDBG("bus resume\n"); */
1473 if (!udc->suspended)
1474 continue;
1475 udc->suspended = 0;
1476
1477 /*
1478 * NOTE: for a VBUS-powered device, the gadget driver
1479 * would normally want to switch out of slow clock
1480 * mode into normal mode.
1481 */
1482 if (udc->driver && udc->driver->resume) {
1483 spin_unlock(&udc->lock);
1484 udc->driver->resume(&udc->gadget);
1485 spin_lock(&udc->lock);
1486 }
1487
1488 /* endpoint IRQs are cleared by handling them */
1489 } else {
1490 int i;
1491 unsigned mask = 1;
1492 struct at91_ep *ep = &udc->ep[1];
1493
1494 if (status & mask)
1495 handle_ep0(udc);
1496 for (i = 1; i < NUM_ENDPOINTS; i++) {
1497 mask <<= 1;
1498 if (status & mask)
1499 handle_ep(ep);
1500 ep++;
1501 }
1502 }
1503 }
1504
1505 if (disable_clock)
1506 clk_off(udc);
1507
1508 spin_unlock_irqrestore(&udc->lock, flags);
1509
1510 return IRQ_HANDLED;
1511 }
1512
1513 /*-------------------------------------------------------------------------*/
1514
1515 static void nop_release(struct device *dev)
1516 {
1517 /* nothing to free */
1518 }
1519
1520 static struct at91_udc controller = {
1521 .gadget = {
1522 .ops = &at91_udc_ops,
1523 .ep0 = &controller.ep[0].ep,
1524 .name = driver_name,
1525 .dev = {
1526 .init_name = "gadget",
1527 .release = nop_release,
1528 }
1529 },
1530 .ep[0] = {
1531 .ep = {
1532 .name = ep0name,
1533 .ops = &at91_ep_ops,
1534 },
1535 .udc = &controller,
1536 .maxpacket = 8,
1537 .int_mask = 1 << 0,
1538 },
1539 .ep[1] = {
1540 .ep = {
1541 .name = "ep1",
1542 .ops = &at91_ep_ops,
1543 },
1544 .udc = &controller,
1545 .is_pingpong = 1,
1546 .maxpacket = 64,
1547 .int_mask = 1 << 1,
1548 },
1549 .ep[2] = {
1550 .ep = {
1551 .name = "ep2",
1552 .ops = &at91_ep_ops,
1553 },
1554 .udc = &controller,
1555 .is_pingpong = 1,
1556 .maxpacket = 64,
1557 .int_mask = 1 << 2,
1558 },
1559 .ep[3] = {
1560 .ep = {
1561 /* could actually do bulk too */
1562 .name = "ep3-int",
1563 .ops = &at91_ep_ops,
1564 },
1565 .udc = &controller,
1566 .maxpacket = 8,
1567 .int_mask = 1 << 3,
1568 },
1569 .ep[4] = {
1570 .ep = {
1571 .name = "ep4",
1572 .ops = &at91_ep_ops,
1573 },
1574 .udc = &controller,
1575 .is_pingpong = 1,
1576 .maxpacket = 256,
1577 .int_mask = 1 << 4,
1578 },
1579 .ep[5] = {
1580 .ep = {
1581 .name = "ep5",
1582 .ops = &at91_ep_ops,
1583 },
1584 .udc = &controller,
1585 .is_pingpong = 1,
1586 .maxpacket = 256,
1587 .int_mask = 1 << 5,
1588 },
1589 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1590 };
1591
1592 static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1593 {
1594 value ^= udc->board.vbus_active_low;
1595 if (value != udc->vbus)
1596 at91_vbus_session(&udc->gadget, value);
1597 }
1598
1599 static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1600 {
1601 struct at91_udc *udc = _udc;
1602
1603 /* vbus needs at least brief debouncing */
1604 udelay(10);
1605 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1606
1607 return IRQ_HANDLED;
1608 }
1609
1610 static void at91_vbus_timer_work(struct work_struct *work)
1611 {
1612 struct at91_udc *udc = container_of(work, struct at91_udc,
1613 vbus_timer_work);
1614
1615 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1616
1617 if (!timer_pending(&udc->vbus_timer))
1618 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1619 }
1620
1621 static void at91_vbus_timer(unsigned long data)
1622 {
1623 struct at91_udc *udc = (struct at91_udc *)data;
1624
1625 /*
1626 * If we are polling vbus it is likely that the gpio is on an
1627 * bus such as i2c or spi which may sleep, so schedule some work
1628 * to read the vbus gpio
1629 */
1630 schedule_work(&udc->vbus_timer_work);
1631 }
1632
1633 static int at91_start(struct usb_gadget *gadget,
1634 struct usb_gadget_driver *driver)
1635 {
1636 struct at91_udc *udc;
1637
1638 udc = container_of(gadget, struct at91_udc, gadget);
1639 udc->driver = driver;
1640 udc->gadget.dev.of_node = udc->pdev->dev.of_node;
1641 udc->enabled = 1;
1642 udc->selfpowered = 1;
1643
1644 DBG("bound to %s\n", driver->driver.name);
1645 return 0;
1646 }
1647
1648 static int at91_stop(struct usb_gadget *gadget,
1649 struct usb_gadget_driver *driver)
1650 {
1651 struct at91_udc *udc;
1652 unsigned long flags;
1653
1654 udc = container_of(gadget, struct at91_udc, gadget);
1655 spin_lock_irqsave(&udc->lock, flags);
1656 udc->enabled = 0;
1657 at91_udp_write(udc, AT91_UDP_IDR, ~0);
1658 spin_unlock_irqrestore(&udc->lock, flags);
1659
1660 udc->driver = NULL;
1661
1662 DBG("unbound from %s\n", driver->driver.name);
1663 return 0;
1664 }
1665
1666 /*-------------------------------------------------------------------------*/
1667
1668 static void at91udc_shutdown(struct platform_device *dev)
1669 {
1670 struct at91_udc *udc = platform_get_drvdata(dev);
1671 unsigned long flags;
1672
1673 /* force disconnect on reboot */
1674 spin_lock_irqsave(&udc->lock, flags);
1675 pullup(platform_get_drvdata(dev), 0);
1676 spin_unlock_irqrestore(&udc->lock, flags);
1677 }
1678
1679 static void at91udc_of_init(struct at91_udc *udc,
1680 struct device_node *np)
1681 {
1682 struct at91_udc_data *board = &udc->board;
1683 u32 val;
1684 enum of_gpio_flags flags;
1685
1686 if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
1687 board->vbus_polled = 1;
1688
1689 board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1690 &flags);
1691 board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1692
1693 board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
1694 &flags);
1695
1696 board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1697 }
1698
1699 static int at91udc_probe(struct platform_device *pdev)
1700 {
1701 struct device *dev = &pdev->dev;
1702 struct at91_udc *udc;
1703 int retval;
1704 struct resource *res;
1705
1706 if (!dev_get_platdata(dev) && !pdev->dev.of_node) {
1707 /* small (so we copy it) but critical! */
1708 DBG("missing platform_data\n");
1709 return -ENODEV;
1710 }
1711
1712 if (pdev->num_resources != 2) {
1713 DBG("invalid num_resources\n");
1714 return -ENODEV;
1715 }
1716 if ((pdev->resource[0].flags != IORESOURCE_MEM)
1717 || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1718 DBG("invalid resource type\n");
1719 return -ENODEV;
1720 }
1721
1722 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1723 if (!res)
1724 return -ENXIO;
1725
1726 if (!request_mem_region(res->start, resource_size(res), driver_name)) {
1727 DBG("someone's using UDC memory\n");
1728 return -EBUSY;
1729 }
1730
1731 /* init software state */
1732 udc = &controller;
1733 udc->gadget.dev.parent = dev;
1734 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
1735 at91udc_of_init(udc, pdev->dev.of_node);
1736 else
1737 memcpy(&udc->board, dev_get_platdata(dev),
1738 sizeof(struct at91_udc_data));
1739 udc->pdev = pdev;
1740 udc->enabled = 0;
1741 spin_lock_init(&udc->lock);
1742
1743 /* rm9200 needs manual D+ pullup; off by default */
1744 if (cpu_is_at91rm9200()) {
1745 if (!gpio_is_valid(udc->board.pullup_pin)) {
1746 DBG("no D+ pullup?\n");
1747 retval = -ENODEV;
1748 goto fail0;
1749 }
1750 retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
1751 if (retval) {
1752 DBG("D+ pullup is busy\n");
1753 goto fail0;
1754 }
1755 gpio_direction_output(udc->board.pullup_pin,
1756 udc->board.pullup_active_low);
1757 }
1758
1759 /* newer chips have more FIFO memory than rm9200 */
1760 if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
1761 usb_ep_set_maxpacket_limit(&udc->ep[0].ep, 64);
1762 usb_ep_set_maxpacket_limit(&udc->ep[3].ep, 64);
1763 usb_ep_set_maxpacket_limit(&udc->ep[4].ep, 512);
1764 usb_ep_set_maxpacket_limit(&udc->ep[5].ep, 512);
1765 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1766 usb_ep_set_maxpacket_limit(&udc->ep[3].ep, 64);
1767 } else if (cpu_is_at91sam9263()) {
1768 usb_ep_set_maxpacket_limit(&udc->ep[0].ep, 64);
1769 usb_ep_set_maxpacket_limit(&udc->ep[3].ep, 64);
1770 }
1771
1772 udc->udp_baseaddr = ioremap(res->start, resource_size(res));
1773 if (!udc->udp_baseaddr) {
1774 retval = -ENOMEM;
1775 goto fail0a;
1776 }
1777
1778 udc_reinit(udc);
1779
1780 /* get interface and function clocks */
1781 udc->iclk = clk_get(dev, "udc_clk");
1782 udc->fclk = clk_get(dev, "udpck");
1783 if (IS_ENABLED(CONFIG_COMMON_CLK))
1784 udc->uclk = clk_get(dev, "usb_clk");
1785 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk) ||
1786 (IS_ENABLED(CONFIG_COMMON_CLK) && IS_ERR(udc->uclk))) {
1787 DBG("clocks missing\n");
1788 retval = -ENODEV;
1789 goto fail1;
1790 }
1791
1792 /* don't do anything until we have both gadget driver and VBUS */
1793 retval = clk_prepare_enable(udc->iclk);
1794 if (retval)
1795 goto fail1;
1796 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1797 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1798 /* Clear all pending interrupts - UDP may be used by bootloader. */
1799 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1800 clk_disable_unprepare(udc->iclk);
1801
1802 /* request UDC and maybe VBUS irqs */
1803 udc->udp_irq = platform_get_irq(pdev, 0);
1804 retval = request_irq(udc->udp_irq, at91_udc_irq,
1805 0, driver_name, udc);
1806 if (retval < 0) {
1807 DBG("request irq %d failed\n", udc->udp_irq);
1808 goto fail1;
1809 }
1810 if (gpio_is_valid(udc->board.vbus_pin)) {
1811 retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
1812 if (retval < 0) {
1813 DBG("request vbus pin failed\n");
1814 goto fail2;
1815 }
1816 gpio_direction_input(udc->board.vbus_pin);
1817
1818 /*
1819 * Get the initial state of VBUS - we cannot expect
1820 * a pending interrupt.
1821 */
1822 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1823 udc->board.vbus_active_low;
1824
1825 if (udc->board.vbus_polled) {
1826 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1827 setup_timer(&udc->vbus_timer, at91_vbus_timer,
1828 (unsigned long)udc);
1829 mod_timer(&udc->vbus_timer,
1830 jiffies + VBUS_POLL_TIMEOUT);
1831 } else {
1832 if (request_irq(gpio_to_irq(udc->board.vbus_pin),
1833 at91_vbus_irq, 0, driver_name, udc)) {
1834 DBG("request vbus irq %d failed\n",
1835 udc->board.vbus_pin);
1836 retval = -EBUSY;
1837 goto fail3;
1838 }
1839 }
1840 } else {
1841 DBG("no VBUS detection, assuming always-on\n");
1842 udc->vbus = 1;
1843 }
1844 retval = usb_add_gadget_udc(dev, &udc->gadget);
1845 if (retval)
1846 goto fail4;
1847 dev_set_drvdata(dev, udc);
1848 device_init_wakeup(dev, 1);
1849 create_debug_file(udc);
1850
1851 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1852 return 0;
1853 fail4:
1854 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled)
1855 free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
1856 fail3:
1857 if (gpio_is_valid(udc->board.vbus_pin))
1858 gpio_free(udc->board.vbus_pin);
1859 fail2:
1860 free_irq(udc->udp_irq, udc);
1861 fail1:
1862 if (IS_ENABLED(CONFIG_COMMON_CLK) && !IS_ERR(udc->uclk))
1863 clk_put(udc->uclk);
1864 if (!IS_ERR(udc->fclk))
1865 clk_put(udc->fclk);
1866 if (!IS_ERR(udc->iclk))
1867 clk_put(udc->iclk);
1868 iounmap(udc->udp_baseaddr);
1869 fail0a:
1870 if (cpu_is_at91rm9200())
1871 gpio_free(udc->board.pullup_pin);
1872 fail0:
1873 release_mem_region(res->start, resource_size(res));
1874 DBG("%s probe failed, %d\n", driver_name, retval);
1875 return retval;
1876 }
1877
1878 static int __exit at91udc_remove(struct platform_device *pdev)
1879 {
1880 struct at91_udc *udc = platform_get_drvdata(pdev);
1881 struct resource *res;
1882 unsigned long flags;
1883
1884 DBG("remove\n");
1885
1886 usb_del_gadget_udc(&udc->gadget);
1887 if (udc->driver)
1888 return -EBUSY;
1889
1890 spin_lock_irqsave(&udc->lock, flags);
1891 pullup(udc, 0);
1892 spin_unlock_irqrestore(&udc->lock, flags);
1893
1894 device_init_wakeup(&pdev->dev, 0);
1895 remove_debug_file(udc);
1896 if (gpio_is_valid(udc->board.vbus_pin)) {
1897 free_irq(gpio_to_irq(udc->board.vbus_pin), udc);
1898 gpio_free(udc->board.vbus_pin);
1899 }
1900 free_irq(udc->udp_irq, udc);
1901 iounmap(udc->udp_baseaddr);
1902
1903 if (cpu_is_at91rm9200())
1904 gpio_free(udc->board.pullup_pin);
1905
1906 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1907 release_mem_region(res->start, resource_size(res));
1908
1909 clk_put(udc->iclk);
1910 clk_put(udc->fclk);
1911 if (IS_ENABLED(CONFIG_COMMON_CLK))
1912 clk_put(udc->uclk);
1913
1914 return 0;
1915 }
1916
1917 #ifdef CONFIG_PM
1918 static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1919 {
1920 struct at91_udc *udc = platform_get_drvdata(pdev);
1921 int wake = udc->driver && device_may_wakeup(&pdev->dev);
1922 unsigned long flags;
1923
1924 /* Unless we can act normally to the host (letting it wake us up
1925 * whenever it has work for us) force disconnect. Wakeup requires
1926 * PLLB for USB events (signaling for reset, wakeup, or incoming
1927 * tokens) and VBUS irqs (on systems which support them).
1928 */
1929 if ((!udc->suspended && udc->addr)
1930 || !wake
1931 || at91_suspend_entering_slow_clock()) {
1932 spin_lock_irqsave(&udc->lock, flags);
1933 pullup(udc, 0);
1934 wake = 0;
1935 spin_unlock_irqrestore(&udc->lock, flags);
1936 } else
1937 enable_irq_wake(udc->udp_irq);
1938
1939 udc->active_suspend = wake;
1940 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
1941 enable_irq_wake(udc->board.vbus_pin);
1942 return 0;
1943 }
1944
1945 static int at91udc_resume(struct platform_device *pdev)
1946 {
1947 struct at91_udc *udc = platform_get_drvdata(pdev);
1948 unsigned long flags;
1949
1950 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
1951 udc->active_suspend)
1952 disable_irq_wake(udc->board.vbus_pin);
1953
1954 /* maybe reconnect to host; if so, clocks on */
1955 if (udc->active_suspend)
1956 disable_irq_wake(udc->udp_irq);
1957 else {
1958 spin_lock_irqsave(&udc->lock, flags);
1959 pullup(udc, 1);
1960 spin_unlock_irqrestore(&udc->lock, flags);
1961 }
1962 return 0;
1963 }
1964 #else
1965 #define at91udc_suspend NULL
1966 #define at91udc_resume NULL
1967 #endif
1968
1969 #if defined(CONFIG_OF)
1970 static const struct of_device_id at91_udc_dt_ids[] = {
1971 { .compatible = "atmel,at91rm9200-udc" },
1972 { /* sentinel */ }
1973 };
1974
1975 MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
1976 #endif
1977
1978 static struct platform_driver at91_udc_driver = {
1979 .remove = __exit_p(at91udc_remove),
1980 .shutdown = at91udc_shutdown,
1981 .suspend = at91udc_suspend,
1982 .resume = at91udc_resume,
1983 .driver = {
1984 .name = (char *) driver_name,
1985 .owner = THIS_MODULE,
1986 .of_match_table = of_match_ptr(at91_udc_dt_ids),
1987 },
1988 };
1989
1990 module_platform_driver_probe(at91_udc_driver, at91udc_probe);
1991
1992 MODULE_DESCRIPTION("AT91 udc driver");
1993 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1994 MODULE_LICENSE("GPL");
1995 MODULE_ALIAS("platform:at91_udc");
Linux with added FPC-III support