projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
usb: gadget: remove incorrect __init/__exit annotations
[deliverable/linux.git] / drivers / usb / gadget / udc / at91_udc.c
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 #include <linux/regmap.h>
35 #include <linux/mfd/syscon.h>
36 #include <linux/mfd/syscon/atmel-matrix.h>
37
38 #include "at91_udc.h"
39
40
41 /*
42 * This controller is simple and PIO-only. It's used in many AT91-series
43 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
44 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
45 *
46 * This driver expects the board has been wired with two GPIOs supporting
47 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
48 * testing hasn't covered such cases.)
49 *
50 * The pullup is most important (so it's integrated on sam926x parts). It
51 * provides software control over whether the host enumerates the device.
52 *
53 * The VBUS sensing helps during enumeration, and allows both USB clocks
54 * (and the transceiver) to stay gated off until they're necessary, saving
55 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
56 * it may also be gated off by software during some Linux sleep states.
57 */
58
59 #define DRIVER_VERSION "3 May 2006"
60
61 static const char driver_name [] = "at91_udc";
62 static const char * const ep_names[] = {
63 "ep0",
64 "ep1",
65 "ep2",
66 "ep3-int",
67 "ep4",
68 "ep5",
69 };
70 #define ep0name ep_names[0]
71
72 #define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
73
74 #define at91_udp_read(udc, reg) \
75 __raw_readl((udc)->udp_baseaddr + (reg))
76 #define at91_udp_write(udc, reg, val) \
77 __raw_writel((val), (udc)->udp_baseaddr + (reg))
78
79 /*-------------------------------------------------------------------------*/
80
81 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
82
83 #include <linux/seq_file.h>
84
85 static const char debug_filename[] = "driver/udc";
86
87 #define FOURBITS "%s%s%s%s"
88 #define EIGHTBITS FOURBITS FOURBITS
89
90 static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
91 {
92 static char *types[] = {
93 "control", "out-iso", "out-bulk", "out-int",
94 "BOGUS", "in-iso", "in-bulk", "in-int"};
95
96 u32 csr;
97 struct at91_request *req;
98 unsigned long flags;
99 struct at91_udc *udc = ep->udc;
100
101 spin_lock_irqsave(&udc->lock, flags);
102
103 csr = __raw_readl(ep->creg);
104
105 /* NOTE: not collecting per-endpoint irq statistics... */
106
107 seq_printf(s, "\n");
108 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
109 ep->ep.name, ep->ep.maxpacket,
110 ep->is_in ? "in" : "out",
111 ep->is_iso ? " iso" : "",
112 ep->is_pingpong
113 ? (ep->fifo_bank ? "pong" : "ping")
114 : "",
115 ep->stopped ? " stopped" : "");
116 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
117 csr,
118 (csr & 0x07ff0000) >> 16,
119 (csr & (1 << 15)) ? "enabled" : "disabled",
120 (csr & (1 << 11)) ? "DATA1" : "DATA0",
121 types[(csr & 0x700) >> 8],
122
123 /* iff type is control then print current direction */
124 (!(csr & 0x700))
125 ? ((csr & (1 << 7)) ? " IN" : " OUT")
126 : "",
127 (csr & (1 << 6)) ? " rxdatabk1" : "",
128 (csr & (1 << 5)) ? " forcestall" : "",
129 (csr & (1 << 4)) ? " txpktrdy" : "",
130
131 (csr & (1 << 3)) ? " stallsent" : "",
132 (csr & (1 << 2)) ? " rxsetup" : "",
133 (csr & (1 << 1)) ? " rxdatabk0" : "",
134 (csr & (1 << 0)) ? " txcomp" : "");
135 if (list_empty (&ep->queue))
136 seq_printf(s, "\t(queue empty)\n");
137
138 else list_for_each_entry (req, &ep->queue, queue) {
139 unsigned length = req->req.actual;
140
141 seq_printf(s, "\treq %p len %d/%d buf %p\n",
142 &req->req, length,
143 req->req.length, req->req.buf);
144 }
145 spin_unlock_irqrestore(&udc->lock, flags);
146 }
147
148 static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
149 {
150 int i;
151
152 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
153 (mask & (1 << 13)) ? " wakeup" : "",
154 (mask & (1 << 12)) ? " endbusres" : "",
155
156 (mask & (1 << 11)) ? " sofint" : "",
157 (mask & (1 << 10)) ? " extrsm" : "",
158 (mask & (1 << 9)) ? " rxrsm" : "",
159 (mask & (1 << 8)) ? " rxsusp" : "");
160 for (i = 0; i < 8; i++) {
161 if (mask & (1 << i))
162 seq_printf(s, " ep%d", i);
163 }
164 seq_printf(s, "\n");
165 }
166
167 static int proc_udc_show(struct seq_file *s, void *unused)
168 {
169 struct at91_udc *udc = s->private;
170 struct at91_ep *ep;
171 u32 tmp;
172
173 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
174
175 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
176 udc->vbus ? "present" : "off",
177 udc->enabled
178 ? (udc->vbus ? "active" : "enabled")
179 : "disabled",
180 udc->gadget.is_selfpowered ? "self" : "VBUS",
181 udc->suspended ? ", suspended" : "",
182 udc->driver ? udc->driver->driver.name : "(none)");
183
184 /* don't access registers when interface isn't clocked */
185 if (!udc->clocked) {
186 seq_printf(s, "(not clocked)\n");
187 return 0;
188 }
189
190 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
191 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
192 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
193 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
194 (tmp & AT91_UDP_NUM));
195
196 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
197 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
198 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
199 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
200 (tmp & AT91_UDP_ESR) ? " esr" : "",
201 (tmp & AT91_UDP_CONFG) ? " confg" : "",
202 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
203
204 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
205 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
206 (tmp & AT91_UDP_FEN) ? " fen" : "",
207 (tmp & AT91_UDP_FADD));
208
209 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
210 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
211
212 if (udc->enabled && udc->vbus) {
213 proc_ep_show(s, &udc->ep[0]);
214 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
215 if (ep->ep.desc)
216 proc_ep_show(s, ep);
217 }
218 }
219 return 0;
220 }
221
222 static int proc_udc_open(struct inode *inode, struct file *file)
223 {
224 return single_open(file, proc_udc_show, PDE_DATA(inode));
225 }
226
227 static const struct file_operations proc_ops = {
228 .owner = THIS_MODULE,
229 .open = proc_udc_open,
230 .read = seq_read,
231 .llseek = seq_lseek,
232 .release = single_release,
233 };
234
235 static void create_debug_file(struct at91_udc *udc)
236 {
237 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
238 }
239
240 static void remove_debug_file(struct at91_udc *udc)
241 {
242 if (udc->pde)
243 remove_proc_entry(debug_filename, NULL);
244 }
245
246 #else
247
248 static inline void create_debug_file(struct at91_udc *udc) {}
249 static inline void remove_debug_file(struct at91_udc *udc) {}
250
251 #endif
252
253
254 /*-------------------------------------------------------------------------*/
255
256 static void done(struct at91_ep *ep, struct at91_request *req, int status)
257 {
258 unsigned stopped = ep->stopped;
259 struct at91_udc *udc = ep->udc;
260
261 list_del_init(&req->queue);
262 if (req->req.status == -EINPROGRESS)
263 req->req.status = status;
264 else
265 status = req->req.status;
266 if (status && status != -ESHUTDOWN)
267 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
268
269 ep->stopped = 1;
270 spin_unlock(&udc->lock);
271 usb_gadget_giveback_request(&ep->ep, &req->req);
272 spin_lock(&udc->lock);
273 ep->stopped = stopped;
274
275 /* ep0 is always ready; other endpoints need a non-empty queue */
276 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
277 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
278 }
279
280 /*-------------------------------------------------------------------------*/
281
282 /* bits indicating OUT fifo has data ready */
283 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
284
285 /*
286 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
287 * back most of the value you just read (because of side effects, including
288 * bits that may change after reading and before writing).
289 *
290 * Except when changing a specific bit, always write values which:
291 * - clear SET_FX bits (setting them could change something)
292 * - set CLR_FX bits (clearing them could change something)
293 *
294 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
295 * that shouldn't normally be changed.
296 *
297 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
298 * implying a need to wait for one write to complete (test relevant bits)
299 * before starting the next write. This shouldn't be an issue given how
300 * infrequently we write, except maybe for write-then-read idioms.
301 */
302 #define SET_FX (AT91_UDP_TXPKTRDY)
303 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
304 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
305
306 /* pull OUT packet data from the endpoint's fifo */
307 static int read_fifo (struct at91_ep *ep, struct at91_request *req)
308 {
309 u32 __iomem *creg = ep->creg;
310 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
311 u32 csr;
312 u8 *buf;
313 unsigned int count, bufferspace, is_done;
314
315 buf = req->req.buf + req->req.actual;
316 bufferspace = req->req.length - req->req.actual;
317
318 /*
319 * there might be nothing to read if ep_queue() calls us,
320 * or if we already emptied both pingpong buffers
321 */
322 rescan:
323 csr = __raw_readl(creg);
324 if ((csr & RX_DATA_READY) == 0)
325 return 0;
326
327 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
328 if (count > ep->ep.maxpacket)
329 count = ep->ep.maxpacket;
330 if (count > bufferspace) {
331 DBG("%s buffer overflow\n", ep->ep.name);
332 req->req.status = -EOVERFLOW;
333 count = bufferspace;
334 }
335 __raw_readsb(dreg, buf, count);
336
337 /* release and swap pingpong mem bank */
338 csr |= CLR_FX;
339 if (ep->is_pingpong) {
340 if (ep->fifo_bank == 0) {
341 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
342 ep->fifo_bank = 1;
343 } else {
344 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
345 ep->fifo_bank = 0;
346 }
347 } else
348 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
349 __raw_writel(csr, creg);
350
351 req->req.actual += count;
352 is_done = (count < ep->ep.maxpacket);
353 if (count == bufferspace)
354 is_done = 1;
355
356 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
357 is_done ? " (done)" : "");
358
359 /*
360 * avoid extra trips through IRQ logic for packets already in
361 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
362 */
363 if (is_done)
364 done(ep, req, 0);
365 else if (ep->is_pingpong) {
366 /*
367 * One dummy read to delay the code because of a HW glitch:
368 * CSR returns bad RXCOUNT when read too soon after updating
369 * RX_DATA_BK flags.
370 */
371 csr = __raw_readl(creg);
372
373 bufferspace -= count;
374 buf += count;
375 goto rescan;
376 }
377
378 return is_done;
379 }
380
381 /* load fifo for an IN packet */
382 static int write_fifo(struct at91_ep *ep, struct at91_request *req)
383 {
384 u32 __iomem *creg = ep->creg;
385 u32 csr = __raw_readl(creg);
386 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
387 unsigned total, count, is_last;
388 u8 *buf;
389
390 /*
391 * TODO: allow for writing two packets to the fifo ... that'll
392 * reduce the amount of IN-NAKing, but probably won't affect
393 * throughput much. (Unlike preventing OUT-NAKing!)
394 */
395
396 /*
397 * If ep_queue() calls us, the queue is empty and possibly in
398 * odd states like TXCOMP not yet cleared (we do it, saving at
399 * least one IRQ) or the fifo not yet being free. Those aren't
400 * issues normally (IRQ handler fast path).
401 */
402 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
403 if (csr & AT91_UDP_TXCOMP) {
404 csr |= CLR_FX;
405 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
406 __raw_writel(csr, creg);
407 csr = __raw_readl(creg);
408 }
409 if (csr & AT91_UDP_TXPKTRDY)
410 return 0;
411 }
412
413 buf = req->req.buf + req->req.actual;
414 prefetch(buf);
415 total = req->req.length - req->req.actual;
416 if (ep->ep.maxpacket < total) {
417 count = ep->ep.maxpacket;
418 is_last = 0;
419 } else {
420 count = total;
421 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
422 }
423
424 /*
425 * Write the packet, maybe it's a ZLP.
426 *
427 * NOTE: incrementing req->actual before we receive the ACK means
428 * gadget driver IN bytecounts can be wrong in fault cases. That's
429 * fixable with PIO drivers like this one (save "count" here, and
430 * do the increment later on TX irq), but not for most DMA hardware.
431 *
432 * So all gadget drivers must accept that potential error. Some
433 * hardware supports precise fifo status reporting, letting them
434 * recover when the actual bytecount matters (e.g. for USB Test
435 * and Measurement Class devices).
436 */
437 __raw_writesb(dreg, buf, count);
438 csr &= ~SET_FX;
439 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
440 __raw_writel(csr, creg);
441 req->req.actual += count;
442
443 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
444 is_last ? " (done)" : "");
445 if (is_last)
446 done(ep, req, 0);
447 return is_last;
448 }
449
450 static void nuke(struct at91_ep *ep, int status)
451 {
452 struct at91_request *req;
453
454 /* terminate any request in the queue */
455 ep->stopped = 1;
456 if (list_empty(&ep->queue))
457 return;
458
459 VDBG("%s %s\n", __func__, ep->ep.name);
460 while (!list_empty(&ep->queue)) {
461 req = list_entry(ep->queue.next, struct at91_request, queue);
462 done(ep, req, status);
463 }
464 }
465
466 /*-------------------------------------------------------------------------*/
467
468 static int at91_ep_enable(struct usb_ep *_ep,
469 const struct usb_endpoint_descriptor *desc)
470 {
471 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
472 struct at91_udc *udc;
473 u16 maxpacket;
474 u32 tmp;
475 unsigned long flags;
476
477 if (!_ep || !ep
478 || !desc || _ep->name == ep0name
479 || desc->bDescriptorType != USB_DT_ENDPOINT
480 || (maxpacket = usb_endpoint_maxp(desc)) == 0
481 || maxpacket > ep->maxpacket) {
482 DBG("bad ep or descriptor\n");
483 return -EINVAL;
484 }
485
486 udc = ep->udc;
487 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
488 DBG("bogus device state\n");
489 return -ESHUTDOWN;
490 }
491
492 tmp = usb_endpoint_type(desc);
493 switch (tmp) {
494 case USB_ENDPOINT_XFER_CONTROL:
495 DBG("only one control endpoint\n");
496 return -EINVAL;
497 case USB_ENDPOINT_XFER_INT:
498 if (maxpacket > 64)
499 goto bogus_max;
500 break;
501 case USB_ENDPOINT_XFER_BULK:
502 switch (maxpacket) {
503 case 8:
504 case 16:
505 case 32:
506 case 64:
507 goto ok;
508 }
509 bogus_max:
510 DBG("bogus maxpacket %d\n", maxpacket);
511 return -EINVAL;
512 case USB_ENDPOINT_XFER_ISOC:
513 if (!ep->is_pingpong) {
514 DBG("iso requires double buffering\n");
515 return -EINVAL;
516 }
517 break;
518 }
519
520 ok:
521 spin_lock_irqsave(&udc->lock, flags);
522
523 /* initialize endpoint to match this descriptor */
524 ep->is_in = usb_endpoint_dir_in(desc);
525 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
526 ep->stopped = 0;
527 if (ep->is_in)
528 tmp |= 0x04;
529 tmp <<= 8;
530 tmp |= AT91_UDP_EPEDS;
531 __raw_writel(tmp, ep->creg);
532
533 ep->ep.maxpacket = maxpacket;
534
535 /*
536 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
537 * since endpoint resets don't reset hw pingpong state.
538 */
539 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
540 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
541
542 spin_unlock_irqrestore(&udc->lock, flags);
543 return 0;
544 }
545
546 static int at91_ep_disable (struct usb_ep * _ep)
547 {
548 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
549 struct at91_udc *udc = ep->udc;
550 unsigned long flags;
551
552 if (ep == &ep->udc->ep[0])
553 return -EINVAL;
554
555 spin_lock_irqsave(&udc->lock, flags);
556
557 nuke(ep, -ESHUTDOWN);
558
559 /* restore the endpoint's pristine config */
560 ep->ep.desc = NULL;
561 ep->ep.maxpacket = ep->maxpacket;
562
563 /* reset fifos and endpoint */
564 if (ep->udc->clocked) {
565 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
566 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
567 __raw_writel(0, ep->creg);
568 }
569
570 spin_unlock_irqrestore(&udc->lock, flags);
571 return 0;
572 }
573
574 /*
575 * this is a PIO-only driver, so there's nothing
576 * interesting for request or buffer allocation.
577 */
578
579 static struct usb_request *
580 at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
581 {
582 struct at91_request *req;
583
584 req = kzalloc(sizeof (struct at91_request), gfp_flags);
585 if (!req)
586 return NULL;
587
588 INIT_LIST_HEAD(&req->queue);
589 return &req->req;
590 }
591
592 static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
593 {
594 struct at91_request *req;
595
596 req = container_of(_req, struct at91_request, req);
597 BUG_ON(!list_empty(&req->queue));
598 kfree(req);
599 }
600
601 static int at91_ep_queue(struct usb_ep *_ep,
602 struct usb_request *_req, gfp_t gfp_flags)
603 {
604 struct at91_request *req;
605 struct at91_ep *ep;
606 struct at91_udc *udc;
607 int status;
608 unsigned long flags;
609
610 req = container_of(_req, struct at91_request, req);
611 ep = container_of(_ep, struct at91_ep, ep);
612
613 if (!_req || !_req->complete
614 || !_req->buf || !list_empty(&req->queue)) {
615 DBG("invalid request\n");
616 return -EINVAL;
617 }
618
619 if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
620 DBG("invalid ep\n");
621 return -EINVAL;
622 }
623
624 udc = ep->udc;
625
626 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
627 DBG("invalid device\n");
628 return -EINVAL;
629 }
630
631 _req->status = -EINPROGRESS;
632 _req->actual = 0;
633
634 spin_lock_irqsave(&udc->lock, flags);
635
636 /* try to kickstart any empty and idle queue */
637 if (list_empty(&ep->queue) && !ep->stopped) {
638 int is_ep0;
639
640 /*
641 * If this control request has a non-empty DATA stage, this
642 * will start that stage. It works just like a non-control
643 * request (until the status stage starts, maybe early).
644 *
645 * If the data stage is empty, then this starts a successful
646 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
647 */
648 is_ep0 = (ep->ep.name == ep0name);
649 if (is_ep0) {
650 u32 tmp;
651
652 if (!udc->req_pending) {
653 status = -EINVAL;
654 goto done;
655 }
656
657 /*
658 * defer changing CONFG until after the gadget driver
659 * reconfigures the endpoints.
660 */
661 if (udc->wait_for_config_ack) {
662 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
663 tmp ^= AT91_UDP_CONFG;
664 VDBG("toggle config\n");
665 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
666 }
667 if (req->req.length == 0) {
668 ep0_in_status:
669 PACKET("ep0 in/status\n");
670 status = 0;
671 tmp = __raw_readl(ep->creg);
672 tmp &= ~SET_FX;
673 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
674 __raw_writel(tmp, ep->creg);
675 udc->req_pending = 0;
676 goto done;
677 }
678 }
679
680 if (ep->is_in)
681 status = write_fifo(ep, req);
682 else {
683 status = read_fifo(ep, req);
684
685 /* IN/STATUS stage is otherwise triggered by irq */
686 if (status && is_ep0)
687 goto ep0_in_status;
688 }
689 } else
690 status = 0;
691
692 if (req && !status) {
693 list_add_tail (&req->queue, &ep->queue);
694 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
695 }
696 done:
697 spin_unlock_irqrestore(&udc->lock, flags);
698 return (status < 0) ? status : 0;
699 }
700
701 static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
702 {
703 struct at91_ep *ep;
704 struct at91_request *req;
705 unsigned long flags;
706 struct at91_udc *udc;
707
708 ep = container_of(_ep, struct at91_ep, ep);
709 if (!_ep || ep->ep.name == ep0name)
710 return -EINVAL;
711
712 udc = ep->udc;
713
714 spin_lock_irqsave(&udc->lock, flags);
715
716 /* make sure it's actually queued on this endpoint */
717 list_for_each_entry (req, &ep->queue, queue) {
718 if (&req->req == _req)
719 break;
720 }
721 if (&req->req != _req) {
722 spin_unlock_irqrestore(&udc->lock, flags);
723 return -EINVAL;
724 }
725
726 done(ep, req, -ECONNRESET);
727 spin_unlock_irqrestore(&udc->lock, flags);
728 return 0;
729 }
730
731 static int at91_ep_set_halt(struct usb_ep *_ep, int value)
732 {
733 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
734 struct at91_udc *udc = ep->udc;
735 u32 __iomem *creg;
736 u32 csr;
737 unsigned long flags;
738 int status = 0;
739
740 if (!_ep || ep->is_iso || !ep->udc->clocked)
741 return -EINVAL;
742
743 creg = ep->creg;
744 spin_lock_irqsave(&udc->lock, flags);
745
746 csr = __raw_readl(creg);
747
748 /*
749 * fail with still-busy IN endpoints, ensuring correct sequencing
750 * of data tx then stall. note that the fifo rx bytecount isn't
751 * completely accurate as a tx bytecount.
752 */
753 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
754 status = -EAGAIN;
755 else {
756 csr |= CLR_FX;
757 csr &= ~SET_FX;
758 if (value) {
759 csr |= AT91_UDP_FORCESTALL;
760 VDBG("halt %s\n", ep->ep.name);
761 } else {
762 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
763 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
764 csr &= ~AT91_UDP_FORCESTALL;
765 }
766 __raw_writel(csr, creg);
767 }
768
769 spin_unlock_irqrestore(&udc->lock, flags);
770 return status;
771 }
772
773 static const struct usb_ep_ops at91_ep_ops = {
774 .enable = at91_ep_enable,
775 .disable = at91_ep_disable,
776 .alloc_request = at91_ep_alloc_request,
777 .free_request = at91_ep_free_request,
778 .queue = at91_ep_queue,
779 .dequeue = at91_ep_dequeue,
780 .set_halt = at91_ep_set_halt,
781 /* there's only imprecise fifo status reporting */
782 };
783
784 /*-------------------------------------------------------------------------*/
785
786 static int at91_get_frame(struct usb_gadget *gadget)
787 {
788 struct at91_udc *udc = to_udc(gadget);
789
790 if (!to_udc(gadget)->clocked)
791 return -EINVAL;
792 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
793 }
794
795 static int at91_wakeup(struct usb_gadget *gadget)
796 {
797 struct at91_udc *udc = to_udc(gadget);
798 u32 glbstate;
799 int status = -EINVAL;
800 unsigned long flags;
801
802 DBG("%s\n", __func__ );
803 spin_lock_irqsave(&udc->lock, flags);
804
805 if (!udc->clocked || !udc->suspended)
806 goto done;
807
808 /* NOTE: some "early versions" handle ESR differently ... */
809
810 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
811 if (!(glbstate & AT91_UDP_ESR))
812 goto done;
813 glbstate |= AT91_UDP_ESR;
814 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
815
816 done:
817 spin_unlock_irqrestore(&udc->lock, flags);
818 return status;
819 }
820
821 /* reinit == restore initial software state */
822 static void udc_reinit(struct at91_udc *udc)
823 {
824 u32 i;
825
826 INIT_LIST_HEAD(&udc->gadget.ep_list);
827 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
828
829 for (i = 0; i < NUM_ENDPOINTS; i++) {
830 struct at91_ep *ep = &udc->ep[i];
831
832 if (i != 0)
833 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
834 ep->ep.desc = NULL;
835 ep->stopped = 0;
836 ep->fifo_bank = 0;
837 usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
838 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
839 /* initialize one queue per endpoint */
840 INIT_LIST_HEAD(&ep->queue);
841 }
842 }
843
844 static void reset_gadget(struct at91_udc *udc)
845 {
846 struct usb_gadget_driver *driver = udc->driver;
847 int i;
848
849 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
850 driver = NULL;
851 udc->gadget.speed = USB_SPEED_UNKNOWN;
852 udc->suspended = 0;
853
854 for (i = 0; i < NUM_ENDPOINTS; i++) {
855 struct at91_ep *ep = &udc->ep[i];
856
857 ep->stopped = 1;
858 nuke(ep, -ESHUTDOWN);
859 }
860 if (driver) {
861 spin_unlock(&udc->lock);
862 usb_gadget_udc_reset(&udc->gadget, driver);
863 spin_lock(&udc->lock);
864 }
865
866 udc_reinit(udc);
867 }
868
869 static void stop_activity(struct at91_udc *udc)
870 {
871 struct usb_gadget_driver *driver = udc->driver;
872 int i;
873
874 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
875 driver = NULL;
876 udc->gadget.speed = USB_SPEED_UNKNOWN;
877 udc->suspended = 0;
878
879 for (i = 0; i < NUM_ENDPOINTS; i++) {
880 struct at91_ep *ep = &udc->ep[i];
881 ep->stopped = 1;
882 nuke(ep, -ESHUTDOWN);
883 }
884 if (driver) {
885 spin_unlock(&udc->lock);
886 driver->disconnect(&udc->gadget);
887 spin_lock(&udc->lock);
888 }
889
890 udc_reinit(udc);
891 }
892
893 static void clk_on(struct at91_udc *udc)
894 {
895 if (udc->clocked)
896 return;
897 udc->clocked = 1;
898
899 clk_enable(udc->iclk);
900 clk_enable(udc->fclk);
901 }
902
903 static void clk_off(struct at91_udc *udc)
904 {
905 if (!udc->clocked)
906 return;
907 udc->clocked = 0;
908 udc->gadget.speed = USB_SPEED_UNKNOWN;
909 clk_disable(udc->fclk);
910 clk_disable(udc->iclk);
911 }
912
913 /*
914 * activate/deactivate link with host; minimize power usage for
915 * inactive links by cutting clocks and transceiver power.
916 */
917 static void pullup(struct at91_udc *udc, int is_on)
918 {
919 if (!udc->enabled || !udc->vbus)
920 is_on = 0;
921 DBG("%sactive\n", is_on ? "" : "in");
922
923 if (is_on) {
924 clk_on(udc);
925 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
926 at91_udp_write(udc, AT91_UDP_TXVC, 0);
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 clk_off(udc);
932 }
933
934 if (udc->caps && udc->caps->pullup)
935 udc->caps->pullup(udc, is_on);
936 }
937
938 /* vbus is here! turn everything on that's ready */
939 static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
940 {
941 struct at91_udc *udc = to_udc(gadget);
942 unsigned long flags;
943
944 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
945 spin_lock_irqsave(&udc->lock, flags);
946 udc->vbus = (is_active != 0);
947 if (udc->driver)
948 pullup(udc, is_active);
949 else
950 pullup(udc, 0);
951 spin_unlock_irqrestore(&udc->lock, flags);
952 return 0;
953 }
954
955 static int at91_pullup(struct usb_gadget *gadget, int is_on)
956 {
957 struct at91_udc *udc = to_udc(gadget);
958 unsigned long flags;
959
960 spin_lock_irqsave(&udc->lock, flags);
961 udc->enabled = is_on = !!is_on;
962 pullup(udc, is_on);
963 spin_unlock_irqrestore(&udc->lock, flags);
964 return 0;
965 }
966
967 static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
968 {
969 struct at91_udc *udc = to_udc(gadget);
970 unsigned long flags;
971
972 spin_lock_irqsave(&udc->lock, flags);
973 gadget->is_selfpowered = (is_on != 0);
974 spin_unlock_irqrestore(&udc->lock, flags);
975 return 0;
976 }
977
978 static int at91_start(struct usb_gadget *gadget,
979 struct usb_gadget_driver *driver);
980 static int at91_stop(struct usb_gadget *gadget);
981
982 static const struct usb_gadget_ops at91_udc_ops = {
983 .get_frame = at91_get_frame,
984 .wakeup = at91_wakeup,
985 .set_selfpowered = at91_set_selfpowered,
986 .vbus_session = at91_vbus_session,
987 .pullup = at91_pullup,
988 .udc_start = at91_start,
989 .udc_stop = at91_stop,
990
991 /*
992 * VBUS-powered devices may also also want to support bigger
993 * power budgets after an appropriate SET_CONFIGURATION.
994 */
995 /* .vbus_power = at91_vbus_power, */
996 };
997
998 /*-------------------------------------------------------------------------*/
999
1000 static int handle_ep(struct at91_ep *ep)
1001 {
1002 struct at91_request *req;
1003 u32 __iomem *creg = ep->creg;
1004 u32 csr = __raw_readl(creg);
1005
1006 if (!list_empty(&ep->queue))
1007 req = list_entry(ep->queue.next,
1008 struct at91_request, queue);
1009 else
1010 req = NULL;
1011
1012 if (ep->is_in) {
1013 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1014 csr |= CLR_FX;
1015 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1016 __raw_writel(csr, creg);
1017 }
1018 if (req)
1019 return write_fifo(ep, req);
1020
1021 } else {
1022 if (csr & AT91_UDP_STALLSENT) {
1023 /* STALLSENT bit == ISOERR */
1024 if (ep->is_iso && req)
1025 req->req.status = -EILSEQ;
1026 csr |= CLR_FX;
1027 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1028 __raw_writel(csr, creg);
1029 csr = __raw_readl(creg);
1030 }
1031 if (req && (csr & RX_DATA_READY))
1032 return read_fifo(ep, req);
1033 }
1034 return 0;
1035 }
1036
1037 union setup {
1038 u8 raw[8];
1039 struct usb_ctrlrequest r;
1040 };
1041
1042 static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1043 {
1044 u32 __iomem *creg = ep->creg;
1045 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1046 unsigned rxcount, i = 0;
1047 u32 tmp;
1048 union setup pkt;
1049 int status = 0;
1050
1051 /* read and ack SETUP; hard-fail for bogus packets */
1052 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1053 if (likely(rxcount == 8)) {
1054 while (rxcount--)
1055 pkt.raw[i++] = __raw_readb(dreg);
1056 if (pkt.r.bRequestType & USB_DIR_IN) {
1057 csr |= AT91_UDP_DIR;
1058 ep->is_in = 1;
1059 } else {
1060 csr &= ~AT91_UDP_DIR;
1061 ep->is_in = 0;
1062 }
1063 } else {
1064 /* REVISIT this happens sometimes under load; why?? */
1065 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1066 status = -EINVAL;
1067 }
1068 csr |= CLR_FX;
1069 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1070 __raw_writel(csr, creg);
1071 udc->wait_for_addr_ack = 0;
1072 udc->wait_for_config_ack = 0;
1073 ep->stopped = 0;
1074 if (unlikely(status != 0))
1075 goto stall;
1076
1077 #define w_index le16_to_cpu(pkt.r.wIndex)
1078 #define w_value le16_to_cpu(pkt.r.wValue)
1079 #define w_length le16_to_cpu(pkt.r.wLength)
1080
1081 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1082 pkt.r.bRequestType, pkt.r.bRequest,
1083 w_value, w_index, w_length);
1084
1085 /*
1086 * A few standard requests get handled here, ones that touch
1087 * hardware ... notably for device and endpoint features.
1088 */
1089 udc->req_pending = 1;
1090 csr = __raw_readl(creg);
1091 csr |= CLR_FX;
1092 csr &= ~SET_FX;
1093 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1094
1095 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1096 | USB_REQ_SET_ADDRESS:
1097 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1098 udc->addr = w_value;
1099 udc->wait_for_addr_ack = 1;
1100 udc->req_pending = 0;
1101 /* FADDR is set later, when we ack host STATUS */
1102 return;
1103
1104 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1105 | USB_REQ_SET_CONFIGURATION:
1106 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1107 if (pkt.r.wValue)
1108 udc->wait_for_config_ack = (tmp == 0);
1109 else
1110 udc->wait_for_config_ack = (tmp != 0);
1111 if (udc->wait_for_config_ack)
1112 VDBG("wait for config\n");
1113 /* CONFG is toggled later, if gadget driver succeeds */
1114 break;
1115
1116 /*
1117 * Hosts may set or clear remote wakeup status, and
1118 * devices may report they're VBUS powered.
1119 */
1120 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1121 | USB_REQ_GET_STATUS:
1122 tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED);
1123 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1124 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1125 PACKET("get device status\n");
1126 __raw_writeb(tmp, dreg);
1127 __raw_writeb(0, dreg);
1128 goto write_in;
1129 /* then STATUS starts later, automatically */
1130 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1131 | USB_REQ_SET_FEATURE:
1132 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1133 goto stall;
1134 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1135 tmp |= AT91_UDP_ESR;
1136 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1137 goto succeed;
1138 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1139 | USB_REQ_CLEAR_FEATURE:
1140 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1141 goto stall;
1142 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1143 tmp &= ~AT91_UDP_ESR;
1144 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1145 goto succeed;
1146
1147 /*
1148 * Interfaces have no feature settings; this is pretty useless.
1149 * we won't even insist the interface exists...
1150 */
1151 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1152 | USB_REQ_GET_STATUS:
1153 PACKET("get interface status\n");
1154 __raw_writeb(0, dreg);
1155 __raw_writeb(0, dreg);
1156 goto write_in;
1157 /* then STATUS starts later, automatically */
1158 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1159 | USB_REQ_SET_FEATURE:
1160 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1161 | USB_REQ_CLEAR_FEATURE:
1162 goto stall;
1163
1164 /*
1165 * Hosts may clear bulk/intr endpoint halt after the gadget
1166 * driver sets it (not widely used); or set it (for testing)
1167 */
1168 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1169 | USB_REQ_GET_STATUS:
1170 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1171 ep = &udc->ep[tmp];
1172 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1173 goto stall;
1174
1175 if (tmp) {
1176 if ((w_index & USB_DIR_IN)) {
1177 if (!ep->is_in)
1178 goto stall;
1179 } else if (ep->is_in)
1180 goto stall;
1181 }
1182 PACKET("get %s status\n", ep->ep.name);
1183 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1184 tmp = (1 << USB_ENDPOINT_HALT);
1185 else
1186 tmp = 0;
1187 __raw_writeb(tmp, dreg);
1188 __raw_writeb(0, dreg);
1189 goto write_in;
1190 /* then STATUS starts later, automatically */
1191 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1192 | USB_REQ_SET_FEATURE:
1193 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1194 ep = &udc->ep[tmp];
1195 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1196 goto stall;
1197 if (!ep->ep.desc || ep->is_iso)
1198 goto stall;
1199 if ((w_index & USB_DIR_IN)) {
1200 if (!ep->is_in)
1201 goto stall;
1202 } else if (ep->is_in)
1203 goto stall;
1204
1205 tmp = __raw_readl(ep->creg);
1206 tmp &= ~SET_FX;
1207 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1208 __raw_writel(tmp, ep->creg);
1209 goto succeed;
1210 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1211 | USB_REQ_CLEAR_FEATURE:
1212 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1213 ep = &udc->ep[tmp];
1214 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1215 goto stall;
1216 if (tmp == 0)
1217 goto succeed;
1218 if (!ep->ep.desc || ep->is_iso)
1219 goto stall;
1220 if ((w_index & USB_DIR_IN)) {
1221 if (!ep->is_in)
1222 goto stall;
1223 } else if (ep->is_in)
1224 goto stall;
1225
1226 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1227 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1228 tmp = __raw_readl(ep->creg);
1229 tmp |= CLR_FX;
1230 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1231 __raw_writel(tmp, ep->creg);
1232 if (!list_empty(&ep->queue))
1233 handle_ep(ep);
1234 goto succeed;
1235 }
1236
1237 #undef w_value
1238 #undef w_index
1239 #undef w_length
1240
1241 /* pass request up to the gadget driver */
1242 if (udc->driver) {
1243 spin_unlock(&udc->lock);
1244 status = udc->driver->setup(&udc->gadget, &pkt.r);
1245 spin_lock(&udc->lock);
1246 }
1247 else
1248 status = -ENODEV;
1249 if (status < 0) {
1250 stall:
1251 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1252 pkt.r.bRequestType, pkt.r.bRequest, status);
1253 csr |= AT91_UDP_FORCESTALL;
1254 __raw_writel(csr, creg);
1255 udc->req_pending = 0;
1256 }
1257 return;
1258
1259 succeed:
1260 /* immediate successful (IN) STATUS after zero length DATA */
1261 PACKET("ep0 in/status\n");
1262 write_in:
1263 csr |= AT91_UDP_TXPKTRDY;
1264 __raw_writel(csr, creg);
1265 udc->req_pending = 0;
1266 }
1267
1268 static void handle_ep0(struct at91_udc *udc)
1269 {
1270 struct at91_ep *ep0 = &udc->ep[0];
1271 u32 __iomem *creg = ep0->creg;
1272 u32 csr = __raw_readl(creg);
1273 struct at91_request *req;
1274
1275 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1276 nuke(ep0, -EPROTO);
1277 udc->req_pending = 0;
1278 csr |= CLR_FX;
1279 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1280 __raw_writel(csr, creg);
1281 VDBG("ep0 stalled\n");
1282 csr = __raw_readl(creg);
1283 }
1284 if (csr & AT91_UDP_RXSETUP) {
1285 nuke(ep0, 0);
1286 udc->req_pending = 0;
1287 handle_setup(udc, ep0, csr);
1288 return;
1289 }
1290
1291 if (list_empty(&ep0->queue))
1292 req = NULL;
1293 else
1294 req = list_entry(ep0->queue.next, struct at91_request, queue);
1295
1296 /* host ACKed an IN packet that we sent */
1297 if (csr & AT91_UDP_TXCOMP) {
1298 csr |= CLR_FX;
1299 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1300
1301 /* write more IN DATA? */
1302 if (req && ep0->is_in) {
1303 if (handle_ep(ep0))
1304 udc->req_pending = 0;
1305
1306 /*
1307 * Ack after:
1308 * - last IN DATA packet (including GET_STATUS)
1309 * - IN/STATUS for OUT DATA
1310 * - IN/STATUS for any zero-length DATA stage
1311 * except for the IN DATA case, the host should send
1312 * an OUT status later, which we'll ack.
1313 */
1314 } else {
1315 udc->req_pending = 0;
1316 __raw_writel(csr, creg);
1317
1318 /*
1319 * SET_ADDRESS takes effect only after the STATUS
1320 * (to the original address) gets acked.
1321 */
1322 if (udc->wait_for_addr_ack) {
1323 u32 tmp;
1324
1325 at91_udp_write(udc, AT91_UDP_FADDR,
1326 AT91_UDP_FEN | udc->addr);
1327 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1328 tmp &= ~AT91_UDP_FADDEN;
1329 if (udc->addr)
1330 tmp |= AT91_UDP_FADDEN;
1331 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1332
1333 udc->wait_for_addr_ack = 0;
1334 VDBG("address %d\n", udc->addr);
1335 }
1336 }
1337 }
1338
1339 /* OUT packet arrived ... */
1340 else if (csr & AT91_UDP_RX_DATA_BK0) {
1341 csr |= CLR_FX;
1342 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1343
1344 /* OUT DATA stage */
1345 if (!ep0->is_in) {
1346 if (req) {
1347 if (handle_ep(ep0)) {
1348 /* send IN/STATUS */
1349 PACKET("ep0 in/status\n");
1350 csr = __raw_readl(creg);
1351 csr &= ~SET_FX;
1352 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1353 __raw_writel(csr, creg);
1354 udc->req_pending = 0;
1355 }
1356 } else if (udc->req_pending) {
1357 /*
1358 * AT91 hardware has a hard time with this
1359 * "deferred response" mode for control-OUT
1360 * transfers. (For control-IN it's fine.)
1361 *
1362 * The normal solution leaves OUT data in the
1363 * fifo until the gadget driver is ready.
1364 * We couldn't do that here without disabling
1365 * the IRQ that tells about SETUP packets,
1366 * e.g. when the host gets impatient...
1367 *
1368 * Working around it by copying into a buffer
1369 * would almost be a non-deferred response,
1370 * except that it wouldn't permit reliable
1371 * stalling of the request. Instead, demand
1372 * that gadget drivers not use this mode.
1373 */
1374 DBG("no control-OUT deferred responses!\n");
1375 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1376 udc->req_pending = 0;
1377 }
1378
1379 /* STATUS stage for control-IN; ack. */
1380 } else {
1381 PACKET("ep0 out/status ACK\n");
1382 __raw_writel(csr, creg);
1383
1384 /* "early" status stage */
1385 if (req)
1386 done(ep0, req, 0);
1387 }
1388 }
1389 }
1390
1391 static irqreturn_t at91_udc_irq (int irq, void *_udc)
1392 {
1393 struct at91_udc *udc = _udc;
1394 u32 rescans = 5;
1395 int disable_clock = 0;
1396 unsigned long flags;
1397
1398 spin_lock_irqsave(&udc->lock, flags);
1399
1400 if (!udc->clocked) {
1401 clk_on(udc);
1402 disable_clock = 1;
1403 }
1404
1405 while (rescans--) {
1406 u32 status;
1407
1408 status = at91_udp_read(udc, AT91_UDP_ISR)
1409 & at91_udp_read(udc, AT91_UDP_IMR);
1410 if (!status)
1411 break;
1412
1413 /* USB reset irq: not maskable */
1414 if (status & AT91_UDP_ENDBUSRES) {
1415 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1416 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1417 /* Atmel code clears this irq twice */
1418 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1419 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1420 VDBG("end bus reset\n");
1421 udc->addr = 0;
1422 reset_gadget(udc);
1423
1424 /* enable ep0 */
1425 at91_udp_write(udc, AT91_UDP_CSR(0),
1426 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1427 udc->gadget.speed = USB_SPEED_FULL;
1428 udc->suspended = 0;
1429 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1430
1431 /*
1432 * NOTE: this driver keeps clocks off unless the
1433 * USB host is present. That saves power, but for
1434 * boards that don't support VBUS detection, both
1435 * clocks need to be active most of the time.
1436 */
1437
1438 /* host initiated suspend (3+ms bus idle) */
1439 } else if (status & AT91_UDP_RXSUSP) {
1440 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1441 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1442 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1443 /* VDBG("bus suspend\n"); */
1444 if (udc->suspended)
1445 continue;
1446 udc->suspended = 1;
1447
1448 /*
1449 * NOTE: when suspending a VBUS-powered device, the
1450 * gadget driver should switch into slow clock mode
1451 * and then into standby to avoid drawing more than
1452 * 500uA power (2500uA for some high-power configs).
1453 */
1454 if (udc->driver && udc->driver->suspend) {
1455 spin_unlock(&udc->lock);
1456 udc->driver->suspend(&udc->gadget);
1457 spin_lock(&udc->lock);
1458 }
1459
1460 /* host initiated resume */
1461 } else if (status & AT91_UDP_RXRSM) {
1462 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1463 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1464 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1465 /* VDBG("bus resume\n"); */
1466 if (!udc->suspended)
1467 continue;
1468 udc->suspended = 0;
1469
1470 /*
1471 * NOTE: for a VBUS-powered device, the gadget driver
1472 * would normally want to switch out of slow clock
1473 * mode into normal mode.
1474 */
1475 if (udc->driver && udc->driver->resume) {
1476 spin_unlock(&udc->lock);
1477 udc->driver->resume(&udc->gadget);
1478 spin_lock(&udc->lock);
1479 }
1480
1481 /* endpoint IRQs are cleared by handling them */
1482 } else {
1483 int i;
1484 unsigned mask = 1;
1485 struct at91_ep *ep = &udc->ep[1];
1486
1487 if (status & mask)
1488 handle_ep0(udc);
1489 for (i = 1; i < NUM_ENDPOINTS; i++) {
1490 mask <<= 1;
1491 if (status & mask)
1492 handle_ep(ep);
1493 ep++;
1494 }
1495 }
1496 }
1497
1498 if (disable_clock)
1499 clk_off(udc);
1500
1501 spin_unlock_irqrestore(&udc->lock, flags);
1502
1503 return IRQ_HANDLED;
1504 }
1505
1506 /*-------------------------------------------------------------------------*/
1507
1508 static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1509 {
1510 value ^= udc->board.vbus_active_low;
1511 if (value != udc->vbus)
1512 at91_vbus_session(&udc->gadget, value);
1513 }
1514
1515 static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1516 {
1517 struct at91_udc *udc = _udc;
1518
1519 /* vbus needs at least brief debouncing */
1520 udelay(10);
1521 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1522
1523 return IRQ_HANDLED;
1524 }
1525
1526 static void at91_vbus_timer_work(struct work_struct *work)
1527 {
1528 struct at91_udc *udc = container_of(work, struct at91_udc,
1529 vbus_timer_work);
1530
1531 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1532
1533 if (!timer_pending(&udc->vbus_timer))
1534 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1535 }
1536
1537 static void at91_vbus_timer(unsigned long data)
1538 {
1539 struct at91_udc *udc = (struct at91_udc *)data;
1540
1541 /*
1542 * If we are polling vbus it is likely that the gpio is on an
1543 * bus such as i2c or spi which may sleep, so schedule some work
1544 * to read the vbus gpio
1545 */
1546 schedule_work(&udc->vbus_timer_work);
1547 }
1548
1549 static int at91_start(struct usb_gadget *gadget,
1550 struct usb_gadget_driver *driver)
1551 {
1552 struct at91_udc *udc;
1553
1554 udc = container_of(gadget, struct at91_udc, gadget);
1555 udc->driver = driver;
1556 udc->gadget.dev.of_node = udc->pdev->dev.of_node;
1557 udc->enabled = 1;
1558 udc->gadget.is_selfpowered = 1;
1559
1560 return 0;
1561 }
1562
1563 static int at91_stop(struct usb_gadget *gadget)
1564 {
1565 struct at91_udc *udc;
1566 unsigned long flags;
1567
1568 udc = container_of(gadget, struct at91_udc, gadget);
1569 spin_lock_irqsave(&udc->lock, flags);
1570 udc->enabled = 0;
1571 at91_udp_write(udc, AT91_UDP_IDR, ~0);
1572 spin_unlock_irqrestore(&udc->lock, flags);
1573
1574 udc->driver = NULL;
1575
1576 return 0;
1577 }
1578
1579 /*-------------------------------------------------------------------------*/
1580
1581 static void at91udc_shutdown(struct platform_device *dev)
1582 {
1583 struct at91_udc *udc = platform_get_drvdata(dev);
1584 unsigned long flags;
1585
1586 /* force disconnect on reboot */
1587 spin_lock_irqsave(&udc->lock, flags);
1588 pullup(platform_get_drvdata(dev), 0);
1589 spin_unlock_irqrestore(&udc->lock, flags);
1590 }
1591
1592 static int at91rm9200_udc_init(struct at91_udc *udc)
1593 {
1594 struct at91_ep *ep;
1595 int ret;
1596 int i;
1597
1598 for (i = 0; i < NUM_ENDPOINTS; i++) {
1599 ep = &udc->ep[i];
1600
1601 switch (i) {
1602 case 0:
1603 case 3:
1604 ep->maxpacket = 8;
1605 break;
1606 case 1 ... 2:
1607 ep->maxpacket = 64;
1608 break;
1609 case 4 ... 5:
1610 ep->maxpacket = 256;
1611 break;
1612 }
1613 }
1614
1615 if (!gpio_is_valid(udc->board.pullup_pin)) {
1616 DBG("no D+ pullup?\n");
1617 return -ENODEV;
1618 }
1619
1620 ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin,
1621 "udc_pullup");
1622 if (ret) {
1623 DBG("D+ pullup is busy\n");
1624 return ret;
1625 }
1626
1627 gpio_direction_output(udc->board.pullup_pin,
1628 udc->board.pullup_active_low);
1629
1630 return 0;
1631 }
1632
1633 static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
1634 {
1635 int active = !udc->board.pullup_active_low;
1636
1637 if (is_on)
1638 gpio_set_value(udc->board.pullup_pin, active);
1639 else
1640 gpio_set_value(udc->board.pullup_pin, !active);
1641 }
1642
1643 static const struct at91_udc_caps at91rm9200_udc_caps = {
1644 .init = at91rm9200_udc_init,
1645 .pullup = at91rm9200_udc_pullup,
1646 };
1647
1648 static int at91sam9260_udc_init(struct at91_udc *udc)
1649 {
1650 struct at91_ep *ep;
1651 int i;
1652
1653 for (i = 0; i < NUM_ENDPOINTS; i++) {
1654 ep = &udc->ep[i];
1655
1656 switch (i) {
1657 case 0 ... 3:
1658 ep->maxpacket = 64;
1659 break;
1660 case 4 ... 5:
1661 ep->maxpacket = 512;
1662 break;
1663 }
1664 }
1665
1666 return 0;
1667 }
1668
1669 static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
1670 {
1671 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
1672
1673 if (is_on)
1674 txvc |= AT91_UDP_TXVC_PUON;
1675 else
1676 txvc &= ~AT91_UDP_TXVC_PUON;
1677
1678 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
1679 }
1680
1681 static const struct at91_udc_caps at91sam9260_udc_caps = {
1682 .init = at91sam9260_udc_init,
1683 .pullup = at91sam9260_udc_pullup,
1684 };
1685
1686 static int at91sam9261_udc_init(struct at91_udc *udc)
1687 {
1688 struct at91_ep *ep;
1689 int i;
1690
1691 for (i = 0; i < NUM_ENDPOINTS; i++) {
1692 ep = &udc->ep[i];
1693
1694 switch (i) {
1695 case 0:
1696 ep->maxpacket = 8;
1697 break;
1698 case 1 ... 3:
1699 ep->maxpacket = 64;
1700 break;
1701 case 4 ... 5:
1702 ep->maxpacket = 256;
1703 break;
1704 }
1705 }
1706
1707 udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node,
1708 "atmel,matrix");
1709 if (IS_ERR(udc->matrix))
1710 return PTR_ERR(udc->matrix);
1711
1712 return 0;
1713 }
1714
1715 static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
1716 {
1717 u32 usbpucr = 0;
1718
1719 if (is_on)
1720 usbpucr = AT91_MATRIX_USBPUCR_PUON;
1721
1722 regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
1723 AT91_MATRIX_USBPUCR_PUON, usbpucr);
1724 }
1725
1726 static const struct at91_udc_caps at91sam9261_udc_caps = {
1727 .init = at91sam9261_udc_init,
1728 .pullup = at91sam9261_udc_pullup,
1729 };
1730
1731 static int at91sam9263_udc_init(struct at91_udc *udc)
1732 {
1733 struct at91_ep *ep;
1734 int i;
1735
1736 for (i = 0; i < NUM_ENDPOINTS; i++) {
1737 ep = &udc->ep[i];
1738
1739 switch (i) {
1740 case 0:
1741 case 1:
1742 case 2:
1743 case 3:
1744 ep->maxpacket = 64;
1745 break;
1746 case 4:
1747 case 5:
1748 ep->maxpacket = 256;
1749 break;
1750 }
1751 }
1752
1753 return 0;
1754 }
1755
1756 static const struct at91_udc_caps at91sam9263_udc_caps = {
1757 .init = at91sam9263_udc_init,
1758 .pullup = at91sam9260_udc_pullup,
1759 };
1760
1761 static const struct of_device_id at91_udc_dt_ids[] = {
1762 {
1763 .compatible = "atmel,at91rm9200-udc",
1764 .data = &at91rm9200_udc_caps,
1765 },
1766 {
1767 .compatible = "atmel,at91sam9260-udc",
1768 .data = &at91sam9260_udc_caps,
1769 },
1770 {
1771 .compatible = "atmel,at91sam9261-udc",
1772 .data = &at91sam9261_udc_caps,
1773 },
1774 {
1775 .compatible = "atmel,at91sam9263-udc",
1776 .data = &at91sam9263_udc_caps,
1777 },
1778 { /* sentinel */ }
1779 };
1780 MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
1781
1782 static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
1783 {
1784 struct at91_udc_data *board = &udc->board;
1785 const struct of_device_id *match;
1786 enum of_gpio_flags flags;
1787 u32 val;
1788
1789 if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
1790 board->vbus_polled = 1;
1791
1792 board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1793 &flags);
1794 board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1795
1796 board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
1797 &flags);
1798
1799 board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1800
1801 match = of_match_node(at91_udc_dt_ids, np);
1802 if (match)
1803 udc->caps = match->data;
1804 }
1805
1806 static int at91udc_probe(struct platform_device *pdev)
1807 {
1808 struct device *dev = &pdev->dev;
1809 struct at91_udc *udc;
1810 int retval;
1811 struct resource *res;
1812 struct at91_ep *ep;
1813 int i;
1814
1815 udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
1816 if (!udc)
1817 return -ENOMEM;
1818
1819 /* init software state */
1820 udc->gadget.dev.parent = dev;
1821 at91udc_of_init(udc, pdev->dev.of_node);
1822 udc->pdev = pdev;
1823 udc->enabled = 0;
1824 spin_lock_init(&udc->lock);
1825
1826 udc->gadget.ops = &at91_udc_ops;
1827 udc->gadget.ep0 = &udc->ep[0].ep;
1828 udc->gadget.name = driver_name;
1829 udc->gadget.dev.init_name = "gadget";
1830
1831 for (i = 0; i < NUM_ENDPOINTS; i++) {
1832 ep = &udc->ep[i];
1833 ep->ep.name = ep_names[i];
1834 ep->ep.ops = &at91_ep_ops;
1835 ep->udc = udc;
1836 ep->int_mask = BIT(i);
1837 if (i != 0 && i != 3)
1838 ep->is_pingpong = 1;
1839 }
1840
1841 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1842 udc->udp_baseaddr = devm_ioremap_resource(dev, res);
1843 if (IS_ERR(udc->udp_baseaddr))
1844 return PTR_ERR(udc->udp_baseaddr);
1845
1846 if (udc->caps && udc->caps->init) {
1847 retval = udc->caps->init(udc);
1848 if (retval)
1849 return retval;
1850 }
1851
1852 udc_reinit(udc);
1853
1854 /* get interface and function clocks */
1855 udc->iclk = devm_clk_get(dev, "pclk");
1856 if (IS_ERR(udc->iclk))
1857 return PTR_ERR(udc->iclk);
1858
1859 udc->fclk = devm_clk_get(dev, "hclk");
1860 if (IS_ERR(udc->fclk))
1861 return PTR_ERR(udc->fclk);
1862
1863 /* don't do anything until we have both gadget driver and VBUS */
1864 clk_set_rate(udc->fclk, 48000000);
1865 retval = clk_prepare(udc->fclk);
1866 if (retval)
1867 return retval;
1868
1869 retval = clk_prepare_enable(udc->iclk);
1870 if (retval)
1871 goto err_unprepare_fclk;
1872
1873 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1874 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1875 /* Clear all pending interrupts - UDP may be used by bootloader. */
1876 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1877 clk_disable(udc->iclk);
1878
1879 /* request UDC and maybe VBUS irqs */
1880 udc->udp_irq = platform_get_irq(pdev, 0);
1881 retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
1882 driver_name, udc);
1883 if (retval) {
1884 DBG("request irq %d failed\n", udc->udp_irq);
1885 goto err_unprepare_iclk;
1886 }
1887
1888 if (gpio_is_valid(udc->board.vbus_pin)) {
1889 retval = devm_gpio_request(dev, udc->board.vbus_pin,
1890 "udc_vbus");
1891 if (retval) {
1892 DBG("request vbus pin failed\n");
1893 goto err_unprepare_iclk;
1894 }
1895
1896 gpio_direction_input(udc->board.vbus_pin);
1897
1898 /*
1899 * Get the initial state of VBUS - we cannot expect
1900 * a pending interrupt.
1901 */
1902 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1903 udc->board.vbus_active_low;
1904
1905 if (udc->board.vbus_polled) {
1906 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1907 setup_timer(&udc->vbus_timer, at91_vbus_timer,
1908 (unsigned long)udc);
1909 mod_timer(&udc->vbus_timer,
1910 jiffies + VBUS_POLL_TIMEOUT);
1911 } else {
1912 retval = devm_request_irq(dev,
1913 gpio_to_irq(udc->board.vbus_pin),
1914 at91_vbus_irq, 0, driver_name, udc);
1915 if (retval) {
1916 DBG("request vbus irq %d failed\n",
1917 udc->board.vbus_pin);
1918 goto err_unprepare_iclk;
1919 }
1920 }
1921 } else {
1922 DBG("no VBUS detection, assuming always-on\n");
1923 udc->vbus = 1;
1924 }
1925 retval = usb_add_gadget_udc(dev, &udc->gadget);
1926 if (retval)
1927 goto err_unprepare_iclk;
1928 dev_set_drvdata(dev, udc);
1929 device_init_wakeup(dev, 1);
1930 create_debug_file(udc);
1931
1932 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1933 return 0;
1934
1935 err_unprepare_iclk:
1936 clk_unprepare(udc->iclk);
1937 err_unprepare_fclk:
1938 clk_unprepare(udc->fclk);
1939
1940 DBG("%s probe failed, %d\n", driver_name, retval);
1941
1942 return retval;
1943 }
1944
1945 static int at91udc_remove(struct platform_device *pdev)
1946 {
1947 struct at91_udc *udc = platform_get_drvdata(pdev);
1948 unsigned long flags;
1949
1950 DBG("remove\n");
1951
1952 usb_del_gadget_udc(&udc->gadget);
1953 if (udc->driver)
1954 return -EBUSY;
1955
1956 spin_lock_irqsave(&udc->lock, flags);
1957 pullup(udc, 0);
1958 spin_unlock_irqrestore(&udc->lock, flags);
1959
1960 device_init_wakeup(&pdev->dev, 0);
1961 remove_debug_file(udc);
1962 clk_unprepare(udc->fclk);
1963 clk_unprepare(udc->iclk);
1964
1965 return 0;
1966 }
1967
1968 #ifdef CONFIG_PM
1969 static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1970 {
1971 struct at91_udc *udc = platform_get_drvdata(pdev);
1972 int wake = udc->driver && device_may_wakeup(&pdev->dev);
1973 unsigned long flags;
1974
1975 /* Unless we can act normally to the host (letting it wake us up
1976 * whenever it has work for us) force disconnect. Wakeup requires
1977 * PLLB for USB events (signaling for reset, wakeup, or incoming
1978 * tokens) and VBUS irqs (on systems which support them).
1979 */
1980 if ((!udc->suspended && udc->addr)
1981 || !wake
1982 || at91_suspend_entering_slow_clock()) {
1983 spin_lock_irqsave(&udc->lock, flags);
1984 pullup(udc, 0);
1985 wake = 0;
1986 spin_unlock_irqrestore(&udc->lock, flags);
1987 } else
1988 enable_irq_wake(udc->udp_irq);
1989
1990 udc->active_suspend = wake;
1991 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
1992 enable_irq_wake(udc->board.vbus_pin);
1993 return 0;
1994 }
1995
1996 static int at91udc_resume(struct platform_device *pdev)
1997 {
1998 struct at91_udc *udc = platform_get_drvdata(pdev);
1999 unsigned long flags;
2000
2001 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
2002 udc->active_suspend)
2003 disable_irq_wake(udc->board.vbus_pin);
2004
2005 /* maybe reconnect to host; if so, clocks on */
2006 if (udc->active_suspend)
2007 disable_irq_wake(udc->udp_irq);
2008 else {
2009 spin_lock_irqsave(&udc->lock, flags);
2010 pullup(udc, 1);
2011 spin_unlock_irqrestore(&udc->lock, flags);
2012 }
2013 return 0;
2014 }
2015 #else
2016 #define at91udc_suspend NULL
2017 #define at91udc_resume NULL
2018 #endif
2019
2020 static struct platform_driver at91_udc_driver = {
2021 .remove = at91udc_remove,
2022 .shutdown = at91udc_shutdown,
2023 .suspend = at91udc_suspend,
2024 .resume = at91udc_resume,
2025 .driver = {
2026 .name = (char *) driver_name,
2027 .of_match_table = at91_udc_dt_ids,
2028 },
2029 };
2030
2031 module_platform_driver_probe(at91_udc_driver, at91udc_probe);
2032
2033 MODULE_DESCRIPTION("AT91 udc driver");
2034 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
2035 MODULE_LICENSE("GPL");
2036 MODULE_ALIAS("platform:at91_udc");
Linux kernel - Deliverables
This page took 0.073821 seconds and 5 git commands to generate.