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x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / usb / gadget / udc / at91_udc.c
blobad743a8493be2eceabb2031a48a834c702b823b9
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * at91_udc -- driver for at91-series USB peripheral controller
4 *
5 * Copyright (C) 2004 by Thomas Rathbone
6 * Copyright (C) 2005 by HP Labs
7 * Copyright (C) 2005 by David Brownell
8 */
9
10 #undef VERBOSE_DEBUG
11 #undef PACKET_TRACE
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/delay.h>
17 #include <linux/ioport.h>
18 #include <linux/slab.h>
19 #include <linux/errno.h>
20 #include <linux/list.h>
21 #include <linux/interrupt.h>
22 #include <linux/proc_fs.h>
23 #include <linux/prefetch.h>
24 #include <linux/clk.h>
25 #include <linux/usb/ch9.h>
26 #include <linux/usb/gadget.h>
27 #include <linux/of.h>
28 #include <linux/of_gpio.h>
29 #include <linux/platform_data/atmel.h>
30 #include <linux/regmap.h>
31 #include <linux/mfd/syscon.h>
32 #include <linux/mfd/syscon/atmel-matrix.h>
33
34 #include "at91_udc.h"
35
36
37 /*
38 * This controller is simple and PIO-only. It's used in many AT91-series
39 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
40 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
41 *
42 * This driver expects the board has been wired with two GPIOs supporting
43 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
44 * testing hasn't covered such cases.)
45 *
46 * The pullup is most important (so it's integrated on sam926x parts). It
47 * provides software control over whether the host enumerates the device.
48 *
49 * The VBUS sensing helps during enumeration, and allows both USB clocks
50 * (and the transceiver) to stay gated off until they're necessary, saving
51 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
52 * it may also be gated off by software during some Linux sleep states.
53 */
54
55 #define DRIVER_VERSION "3 May 2006"
56
57 static const char driver_name [] = "at91_udc";
58
59 static const struct {
60 const char *name;
61 const struct usb_ep_caps caps;
62 } ep_info[] = {
63 #define EP_INFO(_name, _caps) \
64 { \
65 .name = _name, \
66 .caps = _caps, \
67 }
68
69 EP_INFO("ep0",
70 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
71 EP_INFO("ep1",
72 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
73 EP_INFO("ep2",
74 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
75 EP_INFO("ep3-int",
76 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_ALL)),
77 EP_INFO("ep4",
78 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
79 EP_INFO("ep5",
80 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_ALL)),
81
82 #undef EP_INFO
83 };
84
85 #define ep0name ep_info[0].name
86
87 #define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
88
89 #define at91_udp_read(udc, reg) \
90 __raw_readl((udc)->udp_baseaddr + (reg))
91 #define at91_udp_write(udc, reg, val) \
92 __raw_writel((val), (udc)->udp_baseaddr + (reg))
93
94 /*-------------------------------------------------------------------------*/
95
96 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
97
98 #include <linux/seq_file.h>
99
100 static const char debug_filename[] = "driver/udc";
101
102 #define FOURBITS "%s%s%s%s"
103 #define EIGHTBITS FOURBITS FOURBITS
104
105 static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
106 {
107 static char *types[] = {
108 "control", "out-iso", "out-bulk", "out-int",
109 "BOGUS", "in-iso", "in-bulk", "in-int"};
110
111 u32 csr;
112 struct at91_request *req;
113 unsigned long flags;
114 struct at91_udc *udc = ep->udc;
115
116 spin_lock_irqsave(&udc->lock, flags);
117
118 csr = __raw_readl(ep->creg);
119
120 /* NOTE: not collecting per-endpoint irq statistics... */
121
122 seq_printf(s, "\n");
123 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
124 ep->ep.name, ep->ep.maxpacket,
125 ep->is_in ? "in" : "out",
126 ep->is_iso ? " iso" : "",
127 ep->is_pingpong
128 ? (ep->fifo_bank ? "pong" : "ping")
129 : "",
130 ep->stopped ? " stopped" : "");
131 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
132 csr,
133 (csr & 0x07ff0000) >> 16,
134 (csr & (1 << 15)) ? "enabled" : "disabled",
135 (csr & (1 << 11)) ? "DATA1" : "DATA0",
136 types[(csr & 0x700) >> 8],
137
138 /* iff type is control then print current direction */
139 (!(csr & 0x700))
140 ? ((csr & (1 << 7)) ? " IN" : " OUT")
141 : "",
142 (csr & (1 << 6)) ? " rxdatabk1" : "",
143 (csr & (1 << 5)) ? " forcestall" : "",
144 (csr & (1 << 4)) ? " txpktrdy" : "",
145
146 (csr & (1 << 3)) ? " stallsent" : "",
147 (csr & (1 << 2)) ? " rxsetup" : "",
148 (csr & (1 << 1)) ? " rxdatabk0" : "",
149 (csr & (1 << 0)) ? " txcomp" : "");
150 if (list_empty (&ep->queue))
151 seq_printf(s, "\t(queue empty)\n");
152
153 else list_for_each_entry (req, &ep->queue, queue) {
154 unsigned length = req->req.actual;
155
156 seq_printf(s, "\treq %p len %d/%d buf %p\n",
157 &req->req, length,
158 req->req.length, req->req.buf);
159 }
160 spin_unlock_irqrestore(&udc->lock, flags);
161 }
162
163 static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
164 {
165 int i;
166
167 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
168 (mask & (1 << 13)) ? " wakeup" : "",
169 (mask & (1 << 12)) ? " endbusres" : "",
170
171 (mask & (1 << 11)) ? " sofint" : "",
172 (mask & (1 << 10)) ? " extrsm" : "",
173 (mask & (1 << 9)) ? " rxrsm" : "",
174 (mask & (1 << 8)) ? " rxsusp" : "");
175 for (i = 0; i < 8; i++) {
176 if (mask & (1 << i))
177 seq_printf(s, " ep%d", i);
178 }
179 seq_printf(s, "\n");
180 }
181
182 static int proc_udc_show(struct seq_file *s, void *unused)
183 {
184 struct at91_udc *udc = s->private;
185 struct at91_ep *ep;
186 u32 tmp;
187
188 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
189
190 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
191 udc->vbus ? "present" : "off",
192 udc->enabled
193 ? (udc->vbus ? "active" : "enabled")
194 : "disabled",
195 udc->gadget.is_selfpowered ? "self" : "VBUS",
196 udc->suspended ? ", suspended" : "",
197 udc->driver ? udc->driver->driver.name : "(none)");
198
199 /* don't access registers when interface isn't clocked */
200 if (!udc->clocked) {
201 seq_printf(s, "(not clocked)\n");
202 return 0;
203 }
204
205 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
206 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
207 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
208 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
209 (tmp & AT91_UDP_NUM));
210
211 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
212 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
213 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
214 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
215 (tmp & AT91_UDP_ESR) ? " esr" : "",
216 (tmp & AT91_UDP_CONFG) ? " confg" : "",
217 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
218
219 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
220 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
221 (tmp & AT91_UDP_FEN) ? " fen" : "",
222 (tmp & AT91_UDP_FADD));
223
224 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
225 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
226
227 if (udc->enabled && udc->vbus) {
228 proc_ep_show(s, &udc->ep[0]);
229 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
230 if (ep->ep.desc)
231 proc_ep_show(s, ep);
232 }
233 }
234 return 0;
235 }
236
237 static int proc_udc_open(struct inode *inode, struct file *file)
238 {
239 return single_open(file, proc_udc_show, PDE_DATA(inode));
240 }
241
242 static const struct file_operations proc_ops = {
243 .owner = THIS_MODULE,
244 .open = proc_udc_open,
245 .read = seq_read,
246 .llseek = seq_lseek,
247 .release = single_release,
248 };
249
250 static void create_debug_file(struct at91_udc *udc)
251 {
252 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
253 }
254
255 static void remove_debug_file(struct at91_udc *udc)
256 {
257 if (udc->pde)
258 remove_proc_entry(debug_filename, NULL);
259 }
260
261 #else
262
263 static inline void create_debug_file(struct at91_udc *udc) {}
264 static inline void remove_debug_file(struct at91_udc *udc) {}
265
266 #endif
267
268
269 /*-------------------------------------------------------------------------*/
270
271 static void done(struct at91_ep *ep, struct at91_request *req, int status)
272 {
273 unsigned stopped = ep->stopped;
274 struct at91_udc *udc = ep->udc;
275
276 list_del_init(&req->queue);
277 if (req->req.status == -EINPROGRESS)
278 req->req.status = status;
279 else
280 status = req->req.status;
281 if (status && status != -ESHUTDOWN)
282 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
283
284 ep->stopped = 1;
285 spin_unlock(&udc->lock);
286 usb_gadget_giveback_request(&ep->ep, &req->req);
287 spin_lock(&udc->lock);
288 ep->stopped = stopped;
289
290 /* ep0 is always ready; other endpoints need a non-empty queue */
291 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
292 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
293 }
294
295 /*-------------------------------------------------------------------------*/
296
297 /* bits indicating OUT fifo has data ready */
298 #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
299
300 /*
301 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
302 * back most of the value you just read (because of side effects, including
303 * bits that may change after reading and before writing).
304 *
305 * Except when changing a specific bit, always write values which:
306 * - clear SET_FX bits (setting them could change something)
307 * - set CLR_FX bits (clearing them could change something)
308 *
309 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
310 * that shouldn't normally be changed.
311 *
312 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
313 * implying a need to wait for one write to complete (test relevant bits)
314 * before starting the next write. This shouldn't be an issue given how
315 * infrequently we write, except maybe for write-then-read idioms.
316 */
317 #define SET_FX (AT91_UDP_TXPKTRDY)
318 #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
319 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
320
321 /* pull OUT packet data from the endpoint's fifo */
322 static int read_fifo (struct at91_ep *ep, struct at91_request *req)
323 {
324 u32 __iomem *creg = ep->creg;
325 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
326 u32 csr;
327 u8 *buf;
328 unsigned int count, bufferspace, is_done;
329
330 buf = req->req.buf + req->req.actual;
331 bufferspace = req->req.length - req->req.actual;
332
333 /*
334 * there might be nothing to read if ep_queue() calls us,
335 * or if we already emptied both pingpong buffers
336 */
337 rescan:
338 csr = __raw_readl(creg);
339 if ((csr & RX_DATA_READY) == 0)
340 return 0;
341
342 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
343 if (count > ep->ep.maxpacket)
344 count = ep->ep.maxpacket;
345 if (count > bufferspace) {
346 DBG("%s buffer overflow\n", ep->ep.name);
347 req->req.status = -EOVERFLOW;
348 count = bufferspace;
349 }
350 __raw_readsb(dreg, buf, count);
351
352 /* release and swap pingpong mem bank */
353 csr |= CLR_FX;
354 if (ep->is_pingpong) {
355 if (ep->fifo_bank == 0) {
356 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
357 ep->fifo_bank = 1;
358 } else {
359 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
360 ep->fifo_bank = 0;
361 }
362 } else
363 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
364 __raw_writel(csr, creg);
365
366 req->req.actual += count;
367 is_done = (count < ep->ep.maxpacket);
368 if (count == bufferspace)
369 is_done = 1;
370
371 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
372 is_done ? " (done)" : "");
373
374 /*
375 * avoid extra trips through IRQ logic for packets already in
376 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
377 */
378 if (is_done)
379 done(ep, req, 0);
380 else if (ep->is_pingpong) {
381 /*
382 * One dummy read to delay the code because of a HW glitch:
383 * CSR returns bad RXCOUNT when read too soon after updating
384 * RX_DATA_BK flags.
385 */
386 csr = __raw_readl(creg);
387
388 bufferspace -= count;
389 buf += count;
390 goto rescan;
391 }
392
393 return is_done;
394 }
395
396 /* load fifo for an IN packet */
397 static int write_fifo(struct at91_ep *ep, struct at91_request *req)
398 {
399 u32 __iomem *creg = ep->creg;
400 u32 csr = __raw_readl(creg);
401 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
402 unsigned total, count, is_last;
403 u8 *buf;
404
405 /*
406 * TODO: allow for writing two packets to the fifo ... that'll
407 * reduce the amount of IN-NAKing, but probably won't affect
408 * throughput much. (Unlike preventing OUT-NAKing!)
409 */
410
411 /*
412 * If ep_queue() calls us, the queue is empty and possibly in
413 * odd states like TXCOMP not yet cleared (we do it, saving at
414 * least one IRQ) or the fifo not yet being free. Those aren't
415 * issues normally (IRQ handler fast path).
416 */
417 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
418 if (csr & AT91_UDP_TXCOMP) {
419 csr |= CLR_FX;
420 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
421 __raw_writel(csr, creg);
422 csr = __raw_readl(creg);
423 }
424 if (csr & AT91_UDP_TXPKTRDY)
425 return 0;
426 }
427
428 buf = req->req.buf + req->req.actual;
429 prefetch(buf);
430 total = req->req.length - req->req.actual;
431 if (ep->ep.maxpacket < total) {
432 count = ep->ep.maxpacket;
433 is_last = 0;
434 } else {
435 count = total;
436 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
437 }
438
439 /*
440 * Write the packet, maybe it's a ZLP.
441 *
442 * NOTE: incrementing req->actual before we receive the ACK means
443 * gadget driver IN bytecounts can be wrong in fault cases. That's
444 * fixable with PIO drivers like this one (save "count" here, and
445 * do the increment later on TX irq), but not for most DMA hardware.
446 *
447 * So all gadget drivers must accept that potential error. Some
448 * hardware supports precise fifo status reporting, letting them
449 * recover when the actual bytecount matters (e.g. for USB Test
450 * and Measurement Class devices).
451 */
452 __raw_writesb(dreg, buf, count);
453 csr &= ~SET_FX;
454 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
455 __raw_writel(csr, creg);
456 req->req.actual += count;
457
458 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
459 is_last ? " (done)" : "");
460 if (is_last)
461 done(ep, req, 0);
462 return is_last;
463 }
464
465 static void nuke(struct at91_ep *ep, int status)
466 {
467 struct at91_request *req;
468
469 /* terminate any request in the queue */
470 ep->stopped = 1;
471 if (list_empty(&ep->queue))
472 return;
473
474 VDBG("%s %s\n", __func__, ep->ep.name);
475 while (!list_empty(&ep->queue)) {
476 req = list_entry(ep->queue.next, struct at91_request, queue);
477 done(ep, req, status);
478 }
479 }
480
481 /*-------------------------------------------------------------------------*/
482
483 static int at91_ep_enable(struct usb_ep *_ep,
484 const struct usb_endpoint_descriptor *desc)
485 {
486 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
487 struct at91_udc *udc;
488 u16 maxpacket;
489 u32 tmp;
490 unsigned long flags;
491
492 if (!_ep || !ep
493 || !desc || _ep->name == ep0name
494 || desc->bDescriptorType != USB_DT_ENDPOINT
495 || (maxpacket = usb_endpoint_maxp(desc)) == 0
496 || maxpacket > ep->maxpacket) {
497 DBG("bad ep or descriptor\n");
498 return -EINVAL;
499 }
500
501 udc = ep->udc;
502 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
503 DBG("bogus device state\n");
504 return -ESHUTDOWN;
505 }
506
507 tmp = usb_endpoint_type(desc);
508 switch (tmp) {
509 case USB_ENDPOINT_XFER_CONTROL:
510 DBG("only one control endpoint\n");
511 return -EINVAL;
512 case USB_ENDPOINT_XFER_INT:
513 if (maxpacket > 64)
514 goto bogus_max;
515 break;
516 case USB_ENDPOINT_XFER_BULK:
517 switch (maxpacket) {
518 case 8:
519 case 16:
520 case 32:
521 case 64:
522 goto ok;
523 }
524 bogus_max:
525 DBG("bogus maxpacket %d\n", maxpacket);
526 return -EINVAL;
527 case USB_ENDPOINT_XFER_ISOC:
528 if (!ep->is_pingpong) {
529 DBG("iso requires double buffering\n");
530 return -EINVAL;
531 }
532 break;
533 }
534
535 ok:
536 spin_lock_irqsave(&udc->lock, flags);
537
538 /* initialize endpoint to match this descriptor */
539 ep->is_in = usb_endpoint_dir_in(desc);
540 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
541 ep->stopped = 0;
542 if (ep->is_in)
543 tmp |= 0x04;
544 tmp <<= 8;
545 tmp |= AT91_UDP_EPEDS;
546 __raw_writel(tmp, ep->creg);
547
548 ep->ep.maxpacket = maxpacket;
549
550 /*
551 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
552 * since endpoint resets don't reset hw pingpong state.
553 */
554 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
555 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
556
557 spin_unlock_irqrestore(&udc->lock, flags);
558 return 0;
559 }
560
561 static int at91_ep_disable (struct usb_ep * _ep)
562 {
563 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
564 struct at91_udc *udc = ep->udc;
565 unsigned long flags;
566
567 if (ep == &ep->udc->ep[0])
568 return -EINVAL;
569
570 spin_lock_irqsave(&udc->lock, flags);
571
572 nuke(ep, -ESHUTDOWN);
573
574 /* restore the endpoint's pristine config */
575 ep->ep.desc = NULL;
576 ep->ep.maxpacket = ep->maxpacket;
577
578 /* reset fifos and endpoint */
579 if (ep->udc->clocked) {
580 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
581 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
582 __raw_writel(0, ep->creg);
583 }
584
585 spin_unlock_irqrestore(&udc->lock, flags);
586 return 0;
587 }
588
589 /*
590 * this is a PIO-only driver, so there's nothing
591 * interesting for request or buffer allocation.
592 */
593
594 static struct usb_request *
595 at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
596 {
597 struct at91_request *req;
598
599 req = kzalloc(sizeof (struct at91_request), gfp_flags);
600 if (!req)
601 return NULL;
602
603 INIT_LIST_HEAD(&req->queue);
604 return &req->req;
605 }
606
607 static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
608 {
609 struct at91_request *req;
610
611 req = container_of(_req, struct at91_request, req);
612 BUG_ON(!list_empty(&req->queue));
613 kfree(req);
614 }
615
616 static int at91_ep_queue(struct usb_ep *_ep,
617 struct usb_request *_req, gfp_t gfp_flags)
618 {
619 struct at91_request *req;
620 struct at91_ep *ep;
621 struct at91_udc *udc;
622 int status;
623 unsigned long flags;
624
625 req = container_of(_req, struct at91_request, req);
626 ep = container_of(_ep, struct at91_ep, ep);
627
628 if (!_req || !_req->complete
629 || !_req->buf || !list_empty(&req->queue)) {
630 DBG("invalid request\n");
631 return -EINVAL;
632 }
633
634 if (!_ep || (!ep->ep.desc && ep->ep.name != ep0name)) {
635 DBG("invalid ep\n");
636 return -EINVAL;
637 }
638
639 udc = ep->udc;
640
641 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
642 DBG("invalid device\n");
643 return -EINVAL;
644 }
645
646 _req->status = -EINPROGRESS;
647 _req->actual = 0;
648
649 spin_lock_irqsave(&udc->lock, flags);
650
651 /* try to kickstart any empty and idle queue */
652 if (list_empty(&ep->queue) && !ep->stopped) {
653 int is_ep0;
654
655 /*
656 * If this control request has a non-empty DATA stage, this
657 * will start that stage. It works just like a non-control
658 * request (until the status stage starts, maybe early).
659 *
660 * If the data stage is empty, then this starts a successful
661 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
662 */
663 is_ep0 = (ep->ep.name == ep0name);
664 if (is_ep0) {
665 u32 tmp;
666
667 if (!udc->req_pending) {
668 status = -EINVAL;
669 goto done;
670 }
671
672 /*
673 * defer changing CONFG until after the gadget driver
674 * reconfigures the endpoints.
675 */
676 if (udc->wait_for_config_ack) {
677 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
678 tmp ^= AT91_UDP_CONFG;
679 VDBG("toggle config\n");
680 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
681 }
682 if (req->req.length == 0) {
683 ep0_in_status:
684 PACKET("ep0 in/status\n");
685 status = 0;
686 tmp = __raw_readl(ep->creg);
687 tmp &= ~SET_FX;
688 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
689 __raw_writel(tmp, ep->creg);
690 udc->req_pending = 0;
691 goto done;
692 }
693 }
694
695 if (ep->is_in)
696 status = write_fifo(ep, req);
697 else {
698 status = read_fifo(ep, req);
699
700 /* IN/STATUS stage is otherwise triggered by irq */
701 if (status && is_ep0)
702 goto ep0_in_status;
703 }
704 } else
705 status = 0;
706
707 if (req && !status) {
708 list_add_tail (&req->queue, &ep->queue);
709 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
710 }
711 done:
712 spin_unlock_irqrestore(&udc->lock, flags);
713 return (status < 0) ? status : 0;
714 }
715
716 static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
717 {
718 struct at91_ep *ep;
719 struct at91_request *req;
720 unsigned long flags;
721 struct at91_udc *udc;
722
723 ep = container_of(_ep, struct at91_ep, ep);
724 if (!_ep || ep->ep.name == ep0name)
725 return -EINVAL;
726
727 udc = ep->udc;
728
729 spin_lock_irqsave(&udc->lock, flags);
730
731 /* make sure it's actually queued on this endpoint */
732 list_for_each_entry (req, &ep->queue, queue) {
733 if (&req->req == _req)
734 break;
735 }
736 if (&req->req != _req) {
737 spin_unlock_irqrestore(&udc->lock, flags);
738 return -EINVAL;
739 }
740
741 done(ep, req, -ECONNRESET);
742 spin_unlock_irqrestore(&udc->lock, flags);
743 return 0;
744 }
745
746 static int at91_ep_set_halt(struct usb_ep *_ep, int value)
747 {
748 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
749 struct at91_udc *udc = ep->udc;
750 u32 __iomem *creg;
751 u32 csr;
752 unsigned long flags;
753 int status = 0;
754
755 if (!_ep || ep->is_iso || !ep->udc->clocked)
756 return -EINVAL;
757
758 creg = ep->creg;
759 spin_lock_irqsave(&udc->lock, flags);
760
761 csr = __raw_readl(creg);
762
763 /*
764 * fail with still-busy IN endpoints, ensuring correct sequencing
765 * of data tx then stall. note that the fifo rx bytecount isn't
766 * completely accurate as a tx bytecount.
767 */
768 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
769 status = -EAGAIN;
770 else {
771 csr |= CLR_FX;
772 csr &= ~SET_FX;
773 if (value) {
774 csr |= AT91_UDP_FORCESTALL;
775 VDBG("halt %s\n", ep->ep.name);
776 } else {
777 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
778 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
779 csr &= ~AT91_UDP_FORCESTALL;
780 }
781 __raw_writel(csr, creg);
782 }
783
784 spin_unlock_irqrestore(&udc->lock, flags);
785 return status;
786 }
787
788 static const struct usb_ep_ops at91_ep_ops = {
789 .enable = at91_ep_enable,
790 .disable = at91_ep_disable,
791 .alloc_request = at91_ep_alloc_request,
792 .free_request = at91_ep_free_request,
793 .queue = at91_ep_queue,
794 .dequeue = at91_ep_dequeue,
795 .set_halt = at91_ep_set_halt,
796 /* there's only imprecise fifo status reporting */
797 };
798
799 /*-------------------------------------------------------------------------*/
800
801 static int at91_get_frame(struct usb_gadget *gadget)
802 {
803 struct at91_udc *udc = to_udc(gadget);
804
805 if (!to_udc(gadget)->clocked)
806 return -EINVAL;
807 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
808 }
809
810 static int at91_wakeup(struct usb_gadget *gadget)
811 {
812 struct at91_udc *udc = to_udc(gadget);
813 u32 glbstate;
814 int status = -EINVAL;
815 unsigned long flags;
816
817 DBG("%s\n", __func__ );
818 spin_lock_irqsave(&udc->lock, flags);
819
820 if (!udc->clocked || !udc->suspended)
821 goto done;
822
823 /* NOTE: some "early versions" handle ESR differently ... */
824
825 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
826 if (!(glbstate & AT91_UDP_ESR))
827 goto done;
828 glbstate |= AT91_UDP_ESR;
829 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
830
831 done:
832 spin_unlock_irqrestore(&udc->lock, flags);
833 return status;
834 }
835
836 /* reinit == restore initial software state */
837 static void udc_reinit(struct at91_udc *udc)
838 {
839 u32 i;
840
841 INIT_LIST_HEAD(&udc->gadget.ep_list);
842 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
843 udc->gadget.quirk_stall_not_supp = 1;
844
845 for (i = 0; i < NUM_ENDPOINTS; i++) {
846 struct at91_ep *ep = &udc->ep[i];
847
848 if (i != 0)
849 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
850 ep->ep.desc = NULL;
851 ep->stopped = 0;
852 ep->fifo_bank = 0;
853 usb_ep_set_maxpacket_limit(&ep->ep, ep->maxpacket);
854 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
855 /* initialize one queue per endpoint */
856 INIT_LIST_HEAD(&ep->queue);
857 }
858 }
859
860 static void reset_gadget(struct at91_udc *udc)
861 {
862 struct usb_gadget_driver *driver = udc->driver;
863 int i;
864
865 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
866 driver = NULL;
867 udc->gadget.speed = USB_SPEED_UNKNOWN;
868 udc->suspended = 0;
869
870 for (i = 0; i < NUM_ENDPOINTS; i++) {
871 struct at91_ep *ep = &udc->ep[i];
872
873 ep->stopped = 1;
874 nuke(ep, -ESHUTDOWN);
875 }
876 if (driver) {
877 spin_unlock(&udc->lock);
878 usb_gadget_udc_reset(&udc->gadget, driver);
879 spin_lock(&udc->lock);
880 }
881
882 udc_reinit(udc);
883 }
884
885 static void stop_activity(struct at91_udc *udc)
886 {
887 struct usb_gadget_driver *driver = udc->driver;
888 int i;
889
890 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
891 driver = NULL;
892 udc->gadget.speed = USB_SPEED_UNKNOWN;
893 udc->suspended = 0;
894
895 for (i = 0; i < NUM_ENDPOINTS; i++) {
896 struct at91_ep *ep = &udc->ep[i];
897 ep->stopped = 1;
898 nuke(ep, -ESHUTDOWN);
899 }
900 if (driver) {
901 spin_unlock(&udc->lock);
902 driver->disconnect(&udc->gadget);
903 spin_lock(&udc->lock);
904 }
905
906 udc_reinit(udc);
907 }
908
909 static void clk_on(struct at91_udc *udc)
910 {
911 if (udc->clocked)
912 return;
913 udc->clocked = 1;
914
915 clk_enable(udc->iclk);
916 clk_enable(udc->fclk);
917 }
918
919 static void clk_off(struct at91_udc *udc)
920 {
921 if (!udc->clocked)
922 return;
923 udc->clocked = 0;
924 udc->gadget.speed = USB_SPEED_UNKNOWN;
925 clk_disable(udc->fclk);
926 clk_disable(udc->iclk);
927 }
928
929 /*
930 * activate/deactivate link with host; minimize power usage for
931 * inactive links by cutting clocks and transceiver power.
932 */
933 static void pullup(struct at91_udc *udc, int is_on)
934 {
935 if (!udc->enabled || !udc->vbus)
936 is_on = 0;
937 DBG("%sactive\n", is_on ? "" : "in");
938
939 if (is_on) {
940 clk_on(udc);
941 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
942 at91_udp_write(udc, AT91_UDP_TXVC, 0);
943 } else {
944 stop_activity(udc);
945 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
946 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
947 clk_off(udc);
948 }
949
950 if (udc->caps && udc->caps->pullup)
951 udc->caps->pullup(udc, is_on);
952 }
953
954 /* vbus is here! turn everything on that's ready */
955 static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
956 {
957 struct at91_udc *udc = to_udc(gadget);
958 unsigned long flags;
959
960 /* VDBG("vbus %s\n", is_active ? "on" : "off"); */
961 spin_lock_irqsave(&udc->lock, flags);
962 udc->vbus = (is_active != 0);
963 if (udc->driver)
964 pullup(udc, is_active);
965 else
966 pullup(udc, 0);
967 spin_unlock_irqrestore(&udc->lock, flags);
968 return 0;
969 }
970
971 static int at91_pullup(struct usb_gadget *gadget, int is_on)
972 {
973 struct at91_udc *udc = to_udc(gadget);
974 unsigned long flags;
975
976 spin_lock_irqsave(&udc->lock, flags);
977 udc->enabled = is_on = !!is_on;
978 pullup(udc, is_on);
979 spin_unlock_irqrestore(&udc->lock, flags);
980 return 0;
981 }
982
983 static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
984 {
985 struct at91_udc *udc = to_udc(gadget);
986 unsigned long flags;
987
988 spin_lock_irqsave(&udc->lock, flags);
989 gadget->is_selfpowered = (is_on != 0);
990 spin_unlock_irqrestore(&udc->lock, flags);
991 return 0;
992 }
993
994 static int at91_start(struct usb_gadget *gadget,
995 struct usb_gadget_driver *driver);
996 static int at91_stop(struct usb_gadget *gadget);
997
998 static const struct usb_gadget_ops at91_udc_ops = {
999 .get_frame = at91_get_frame,
1000 .wakeup = at91_wakeup,
1001 .set_selfpowered = at91_set_selfpowered,
1002 .vbus_session = at91_vbus_session,
1003 .pullup = at91_pullup,
1004 .udc_start = at91_start,
1005 .udc_stop = at91_stop,
1006
1007 /*
1008 * VBUS-powered devices may also also want to support bigger
1009 * power budgets after an appropriate SET_CONFIGURATION.
1010 */
1011 /* .vbus_power = at91_vbus_power, */
1012 };
1013
1014 /*-------------------------------------------------------------------------*/
1015
1016 static int handle_ep(struct at91_ep *ep)
1017 {
1018 struct at91_request *req;
1019 u32 __iomem *creg = ep->creg;
1020 u32 csr = __raw_readl(creg);
1021
1022 if (!list_empty(&ep->queue))
1023 req = list_entry(ep->queue.next,
1024 struct at91_request, queue);
1025 else
1026 req = NULL;
1027
1028 if (ep->is_in) {
1029 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1030 csr |= CLR_FX;
1031 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1032 __raw_writel(csr, creg);
1033 }
1034 if (req)
1035 return write_fifo(ep, req);
1036
1037 } else {
1038 if (csr & AT91_UDP_STALLSENT) {
1039 /* STALLSENT bit == ISOERR */
1040 if (ep->is_iso && req)
1041 req->req.status = -EILSEQ;
1042 csr |= CLR_FX;
1043 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1044 __raw_writel(csr, creg);
1045 csr = __raw_readl(creg);
1046 }
1047 if (req && (csr & RX_DATA_READY))
1048 return read_fifo(ep, req);
1049 }
1050 return 0;
1051 }
1052
1053 union setup {
1054 u8 raw[8];
1055 struct usb_ctrlrequest r;
1056 };
1057
1058 static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1059 {
1060 u32 __iomem *creg = ep->creg;
1061 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1062 unsigned rxcount, i = 0;
1063 u32 tmp;
1064 union setup pkt;
1065 int status = 0;
1066
1067 /* read and ack SETUP; hard-fail for bogus packets */
1068 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1069 if (likely(rxcount == 8)) {
1070 while (rxcount--)
1071 pkt.raw[i++] = __raw_readb(dreg);
1072 if (pkt.r.bRequestType & USB_DIR_IN) {
1073 csr |= AT91_UDP_DIR;
1074 ep->is_in = 1;
1075 } else {
1076 csr &= ~AT91_UDP_DIR;
1077 ep->is_in = 0;
1078 }
1079 } else {
1080 /* REVISIT this happens sometimes under load; why?? */
1081 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1082 status = -EINVAL;
1083 }
1084 csr |= CLR_FX;
1085 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1086 __raw_writel(csr, creg);
1087 udc->wait_for_addr_ack = 0;
1088 udc->wait_for_config_ack = 0;
1089 ep->stopped = 0;
1090 if (unlikely(status != 0))
1091 goto stall;
1092
1093 #define w_index le16_to_cpu(pkt.r.wIndex)
1094 #define w_value le16_to_cpu(pkt.r.wValue)
1095 #define w_length le16_to_cpu(pkt.r.wLength)
1096
1097 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1098 pkt.r.bRequestType, pkt.r.bRequest,
1099 w_value, w_index, w_length);
1100
1101 /*
1102 * A few standard requests get handled here, ones that touch
1103 * hardware ... notably for device and endpoint features.
1104 */
1105 udc->req_pending = 1;
1106 csr = __raw_readl(creg);
1107 csr |= CLR_FX;
1108 csr &= ~SET_FX;
1109 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1110
1111 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1112 | USB_REQ_SET_ADDRESS:
1113 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1114 udc->addr = w_value;
1115 udc->wait_for_addr_ack = 1;
1116 udc->req_pending = 0;
1117 /* FADDR is set later, when we ack host STATUS */
1118 return;
1119
1120 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1121 | USB_REQ_SET_CONFIGURATION:
1122 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1123 if (pkt.r.wValue)
1124 udc->wait_for_config_ack = (tmp == 0);
1125 else
1126 udc->wait_for_config_ack = (tmp != 0);
1127 if (udc->wait_for_config_ack)
1128 VDBG("wait for config\n");
1129 /* CONFG is toggled later, if gadget driver succeeds */
1130 break;
1131
1132 /*
1133 * Hosts may set or clear remote wakeup status, and
1134 * devices may report they're VBUS powered.
1135 */
1136 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1137 | USB_REQ_GET_STATUS:
1138 tmp = (udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED);
1139 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1140 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1141 PACKET("get device status\n");
1142 __raw_writeb(tmp, dreg);
1143 __raw_writeb(0, dreg);
1144 goto write_in;
1145 /* then STATUS starts later, automatically */
1146 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1147 | USB_REQ_SET_FEATURE:
1148 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1149 goto stall;
1150 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1151 tmp |= AT91_UDP_ESR;
1152 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1153 goto succeed;
1154 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1155 | USB_REQ_CLEAR_FEATURE:
1156 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1157 goto stall;
1158 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1159 tmp &= ~AT91_UDP_ESR;
1160 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1161 goto succeed;
1162
1163 /*
1164 * Interfaces have no feature settings; this is pretty useless.
1165 * we won't even insist the interface exists...
1166 */
1167 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1168 | USB_REQ_GET_STATUS:
1169 PACKET("get interface status\n");
1170 __raw_writeb(0, dreg);
1171 __raw_writeb(0, dreg);
1172 goto write_in;
1173 /* then STATUS starts later, automatically */
1174 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1175 | USB_REQ_SET_FEATURE:
1176 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1177 | USB_REQ_CLEAR_FEATURE:
1178 goto stall;
1179
1180 /*
1181 * Hosts may clear bulk/intr endpoint halt after the gadget
1182 * driver sets it (not widely used); or set it (for testing)
1183 */
1184 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1185 | USB_REQ_GET_STATUS:
1186 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1187 ep = &udc->ep[tmp];
1188 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->ep.desc))
1189 goto stall;
1190
1191 if (tmp) {
1192 if ((w_index & USB_DIR_IN)) {
1193 if (!ep->is_in)
1194 goto stall;
1195 } else if (ep->is_in)
1196 goto stall;
1197 }
1198 PACKET("get %s status\n", ep->ep.name);
1199 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1200 tmp = (1 << USB_ENDPOINT_HALT);
1201 else
1202 tmp = 0;
1203 __raw_writeb(tmp, dreg);
1204 __raw_writeb(0, dreg);
1205 goto write_in;
1206 /* then STATUS starts later, automatically */
1207 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1208 | USB_REQ_SET_FEATURE:
1209 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1210 ep = &udc->ep[tmp];
1211 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1212 goto stall;
1213 if (!ep->ep.desc || ep->is_iso)
1214 goto stall;
1215 if ((w_index & USB_DIR_IN)) {
1216 if (!ep->is_in)
1217 goto stall;
1218 } else if (ep->is_in)
1219 goto stall;
1220
1221 tmp = __raw_readl(ep->creg);
1222 tmp &= ~SET_FX;
1223 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1224 __raw_writel(tmp, ep->creg);
1225 goto succeed;
1226 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1227 | USB_REQ_CLEAR_FEATURE:
1228 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1229 ep = &udc->ep[tmp];
1230 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1231 goto stall;
1232 if (tmp == 0)
1233 goto succeed;
1234 if (!ep->ep.desc || ep->is_iso)
1235 goto stall;
1236 if ((w_index & USB_DIR_IN)) {
1237 if (!ep->is_in)
1238 goto stall;
1239 } else if (ep->is_in)
1240 goto stall;
1241
1242 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1243 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1244 tmp = __raw_readl(ep->creg);
1245 tmp |= CLR_FX;
1246 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1247 __raw_writel(tmp, ep->creg);
1248 if (!list_empty(&ep->queue))
1249 handle_ep(ep);
1250 goto succeed;
1251 }
1252
1253 #undef w_value
1254 #undef w_index
1255 #undef w_length
1256
1257 /* pass request up to the gadget driver */
1258 if (udc->driver) {
1259 spin_unlock(&udc->lock);
1260 status = udc->driver->setup(&udc->gadget, &pkt.r);
1261 spin_lock(&udc->lock);
1262 }
1263 else
1264 status = -ENODEV;
1265 if (status < 0) {
1266 stall:
1267 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1268 pkt.r.bRequestType, pkt.r.bRequest, status);
1269 csr |= AT91_UDP_FORCESTALL;
1270 __raw_writel(csr, creg);
1271 udc->req_pending = 0;
1272 }
1273 return;
1274
1275 succeed:
1276 /* immediate successful (IN) STATUS after zero length DATA */
1277 PACKET("ep0 in/status\n");
1278 write_in:
1279 csr |= AT91_UDP_TXPKTRDY;
1280 __raw_writel(csr, creg);
1281 udc->req_pending = 0;
1282 }
1283
1284 static void handle_ep0(struct at91_udc *udc)
1285 {
1286 struct at91_ep *ep0 = &udc->ep[0];
1287 u32 __iomem *creg = ep0->creg;
1288 u32 csr = __raw_readl(creg);
1289 struct at91_request *req;
1290
1291 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1292 nuke(ep0, -EPROTO);
1293 udc->req_pending = 0;
1294 csr |= CLR_FX;
1295 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1296 __raw_writel(csr, creg);
1297 VDBG("ep0 stalled\n");
1298 csr = __raw_readl(creg);
1299 }
1300 if (csr & AT91_UDP_RXSETUP) {
1301 nuke(ep0, 0);
1302 udc->req_pending = 0;
1303 handle_setup(udc, ep0, csr);
1304 return;
1305 }
1306
1307 if (list_empty(&ep0->queue))
1308 req = NULL;
1309 else
1310 req = list_entry(ep0->queue.next, struct at91_request, queue);
1311
1312 /* host ACKed an IN packet that we sent */
1313 if (csr & AT91_UDP_TXCOMP) {
1314 csr |= CLR_FX;
1315 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1316
1317 /* write more IN DATA? */
1318 if (req && ep0->is_in) {
1319 if (handle_ep(ep0))
1320 udc->req_pending = 0;
1321
1322 /*
1323 * Ack after:
1324 * - last IN DATA packet (including GET_STATUS)
1325 * - IN/STATUS for OUT DATA
1326 * - IN/STATUS for any zero-length DATA stage
1327 * except for the IN DATA case, the host should send
1328 * an OUT status later, which we'll ack.
1329 */
1330 } else {
1331 udc->req_pending = 0;
1332 __raw_writel(csr, creg);
1333
1334 /*
1335 * SET_ADDRESS takes effect only after the STATUS
1336 * (to the original address) gets acked.
1337 */
1338 if (udc->wait_for_addr_ack) {
1339 u32 tmp;
1340
1341 at91_udp_write(udc, AT91_UDP_FADDR,
1342 AT91_UDP_FEN | udc->addr);
1343 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1344 tmp &= ~AT91_UDP_FADDEN;
1345 if (udc->addr)
1346 tmp |= AT91_UDP_FADDEN;
1347 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1348
1349 udc->wait_for_addr_ack = 0;
1350 VDBG("address %d\n", udc->addr);
1351 }
1352 }
1353 }
1354
1355 /* OUT packet arrived ... */
1356 else if (csr & AT91_UDP_RX_DATA_BK0) {
1357 csr |= CLR_FX;
1358 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1359
1360 /* OUT DATA stage */
1361 if (!ep0->is_in) {
1362 if (req) {
1363 if (handle_ep(ep0)) {
1364 /* send IN/STATUS */
1365 PACKET("ep0 in/status\n");
1366 csr = __raw_readl(creg);
1367 csr &= ~SET_FX;
1368 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1369 __raw_writel(csr, creg);
1370 udc->req_pending = 0;
1371 }
1372 } else if (udc->req_pending) {
1373 /*
1374 * AT91 hardware has a hard time with this
1375 * "deferred response" mode for control-OUT
1376 * transfers. (For control-IN it's fine.)
1377 *
1378 * The normal solution leaves OUT data in the
1379 * fifo until the gadget driver is ready.
1380 * We couldn't do that here without disabling
1381 * the IRQ that tells about SETUP packets,
1382 * e.g. when the host gets impatient...
1383 *
1384 * Working around it by copying into a buffer
1385 * would almost be a non-deferred response,
1386 * except that it wouldn't permit reliable
1387 * stalling of the request. Instead, demand
1388 * that gadget drivers not use this mode.
1389 */
1390 DBG("no control-OUT deferred responses!\n");
1391 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1392 udc->req_pending = 0;
1393 }
1394
1395 /* STATUS stage for control-IN; ack. */
1396 } else {
1397 PACKET("ep0 out/status ACK\n");
1398 __raw_writel(csr, creg);
1399
1400 /* "early" status stage */
1401 if (req)
1402 done(ep0, req, 0);
1403 }
1404 }
1405 }
1406
1407 static irqreturn_t at91_udc_irq (int irq, void *_udc)
1408 {
1409 struct at91_udc *udc = _udc;
1410 u32 rescans = 5;
1411 int disable_clock = 0;
1412 unsigned long flags;
1413
1414 spin_lock_irqsave(&udc->lock, flags);
1415
1416 if (!udc->clocked) {
1417 clk_on(udc);
1418 disable_clock = 1;
1419 }
1420
1421 while (rescans--) {
1422 u32 status;
1423
1424 status = at91_udp_read(udc, AT91_UDP_ISR)
1425 & at91_udp_read(udc, AT91_UDP_IMR);
1426 if (!status)
1427 break;
1428
1429 /* USB reset irq: not maskable */
1430 if (status & AT91_UDP_ENDBUSRES) {
1431 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1432 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1433 /* Atmel code clears this irq twice */
1434 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1435 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1436 VDBG("end bus reset\n");
1437 udc->addr = 0;
1438 reset_gadget(udc);
1439
1440 /* enable ep0 */
1441 at91_udp_write(udc, AT91_UDP_CSR(0),
1442 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1443 udc->gadget.speed = USB_SPEED_FULL;
1444 udc->suspended = 0;
1445 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1446
1447 /*
1448 * NOTE: this driver keeps clocks off unless the
1449 * USB host is present. That saves power, but for
1450 * boards that don't support VBUS detection, both
1451 * clocks need to be active most of the time.
1452 */
1453
1454 /* host initiated suspend (3+ms bus idle) */
1455 } else if (status & AT91_UDP_RXSUSP) {
1456 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1457 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1458 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1459 /* VDBG("bus suspend\n"); */
1460 if (udc->suspended)
1461 continue;
1462 udc->suspended = 1;
1463
1464 /*
1465 * NOTE: when suspending a VBUS-powered device, the
1466 * gadget driver should switch into slow clock mode
1467 * and then into standby to avoid drawing more than
1468 * 500uA power (2500uA for some high-power configs).
1469 */
1470 if (udc->driver && udc->driver->suspend) {
1471 spin_unlock(&udc->lock);
1472 udc->driver->suspend(&udc->gadget);
1473 spin_lock(&udc->lock);
1474 }
1475
1476 /* host initiated resume */
1477 } else if (status & AT91_UDP_RXRSM) {
1478 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1479 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1480 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1481 /* VDBG("bus resume\n"); */
1482 if (!udc->suspended)
1483 continue;
1484 udc->suspended = 0;
1485
1486 /*
1487 * NOTE: for a VBUS-powered device, the gadget driver
1488 * would normally want to switch out of slow clock
1489 * mode into normal mode.
1490 */
1491 if (udc->driver && udc->driver->resume) {
1492 spin_unlock(&udc->lock);
1493 udc->driver->resume(&udc->gadget);
1494 spin_lock(&udc->lock);
1495 }
1496
1497 /* endpoint IRQs are cleared by handling them */
1498 } else {
1499 int i;
1500 unsigned mask = 1;
1501 struct at91_ep *ep = &udc->ep[1];
1502
1503 if (status & mask)
1504 handle_ep0(udc);
1505 for (i = 1; i < NUM_ENDPOINTS; i++) {
1506 mask <<= 1;
1507 if (status & mask)
1508 handle_ep(ep);
1509 ep++;
1510 }
1511 }
1512 }
1513
1514 if (disable_clock)
1515 clk_off(udc);
1516
1517 spin_unlock_irqrestore(&udc->lock, flags);
1518
1519 return IRQ_HANDLED;
1520 }
1521
1522 /*-------------------------------------------------------------------------*/
1523
1524 static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1525 {
1526 value ^= udc->board.vbus_active_low;
1527 if (value != udc->vbus)
1528 at91_vbus_session(&udc->gadget, value);
1529 }
1530
1531 static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1532 {
1533 struct at91_udc *udc = _udc;
1534
1535 /* vbus needs at least brief debouncing */
1536 udelay(10);
1537 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1538
1539 return IRQ_HANDLED;
1540 }
1541
1542 static void at91_vbus_timer_work(struct work_struct *work)
1543 {
1544 struct at91_udc *udc = container_of(work, struct at91_udc,
1545 vbus_timer_work);
1546
1547 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1548
1549 if (!timer_pending(&udc->vbus_timer))
1550 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1551 }
1552
1553 static void at91_vbus_timer(struct timer_list *t)
1554 {
1555 struct at91_udc *udc = from_timer(udc, t, vbus_timer);
1556
1557 /*
1558 * If we are polling vbus it is likely that the gpio is on an
1559 * bus such as i2c or spi which may sleep, so schedule some work
1560 * to read the vbus gpio
1561 */
1562 schedule_work(&udc->vbus_timer_work);
1563 }
1564
1565 static int at91_start(struct usb_gadget *gadget,
1566 struct usb_gadget_driver *driver)
1567 {
1568 struct at91_udc *udc;
1569
1570 udc = container_of(gadget, struct at91_udc, gadget);
1571 udc->driver = driver;
1572 udc->gadget.dev.of_node = udc->pdev->dev.of_node;
1573 udc->enabled = 1;
1574 udc->gadget.is_selfpowered = 1;
1575
1576 return 0;
1577 }
1578
1579 static int at91_stop(struct usb_gadget *gadget)
1580 {
1581 struct at91_udc *udc;
1582 unsigned long flags;
1583
1584 udc = container_of(gadget, struct at91_udc, gadget);
1585 spin_lock_irqsave(&udc->lock, flags);
1586 udc->enabled = 0;
1587 at91_udp_write(udc, AT91_UDP_IDR, ~0);
1588 spin_unlock_irqrestore(&udc->lock, flags);
1589
1590 udc->driver = NULL;
1591
1592 return 0;
1593 }
1594
1595 /*-------------------------------------------------------------------------*/
1596
1597 static void at91udc_shutdown(struct platform_device *dev)
1598 {
1599 struct at91_udc *udc = platform_get_drvdata(dev);
1600 unsigned long flags;
1601
1602 /* force disconnect on reboot */
1603 spin_lock_irqsave(&udc->lock, flags);
1604 pullup(platform_get_drvdata(dev), 0);
1605 spin_unlock_irqrestore(&udc->lock, flags);
1606 }
1607
1608 static int at91rm9200_udc_init(struct at91_udc *udc)
1609 {
1610 struct at91_ep *ep;
1611 int ret;
1612 int i;
1613
1614 for (i = 0; i < NUM_ENDPOINTS; i++) {
1615 ep = &udc->ep[i];
1616
1617 switch (i) {
1618 case 0:
1619 case 3:
1620 ep->maxpacket = 8;
1621 break;
1622 case 1 ... 2:
1623 ep->maxpacket = 64;
1624 break;
1625 case 4 ... 5:
1626 ep->maxpacket = 256;
1627 break;
1628 }
1629 }
1630
1631 if (!gpio_is_valid(udc->board.pullup_pin)) {
1632 DBG("no D+ pullup?\n");
1633 return -ENODEV;
1634 }
1635
1636 ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin,
1637 "udc_pullup");
1638 if (ret) {
1639 DBG("D+ pullup is busy\n");
1640 return ret;
1641 }
1642
1643 gpio_direction_output(udc->board.pullup_pin,
1644 udc->board.pullup_active_low);
1645
1646 return 0;
1647 }
1648
1649 static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
1650 {
1651 int active = !udc->board.pullup_active_low;
1652
1653 if (is_on)
1654 gpio_set_value(udc->board.pullup_pin, active);
1655 else
1656 gpio_set_value(udc->board.pullup_pin, !active);
1657 }
1658
1659 static const struct at91_udc_caps at91rm9200_udc_caps = {
1660 .init = at91rm9200_udc_init,
1661 .pullup = at91rm9200_udc_pullup,
1662 };
1663
1664 static int at91sam9260_udc_init(struct at91_udc *udc)
1665 {
1666 struct at91_ep *ep;
1667 int i;
1668
1669 for (i = 0; i < NUM_ENDPOINTS; i++) {
1670 ep = &udc->ep[i];
1671
1672 switch (i) {
1673 case 0 ... 3:
1674 ep->maxpacket = 64;
1675 break;
1676 case 4 ... 5:
1677 ep->maxpacket = 512;
1678 break;
1679 }
1680 }
1681
1682 return 0;
1683 }
1684
1685 static void at91sam9260_udc_pullup(struct at91_udc *udc, int is_on)
1686 {
1687 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
1688
1689 if (is_on)
1690 txvc |= AT91_UDP_TXVC_PUON;
1691 else
1692 txvc &= ~AT91_UDP_TXVC_PUON;
1693
1694 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
1695 }
1696
1697 static const struct at91_udc_caps at91sam9260_udc_caps = {
1698 .init = at91sam9260_udc_init,
1699 .pullup = at91sam9260_udc_pullup,
1700 };
1701
1702 static int at91sam9261_udc_init(struct at91_udc *udc)
1703 {
1704 struct at91_ep *ep;
1705 int i;
1706
1707 for (i = 0; i < NUM_ENDPOINTS; i++) {
1708 ep = &udc->ep[i];
1709
1710 switch (i) {
1711 case 0:
1712 ep->maxpacket = 8;
1713 break;
1714 case 1 ... 3:
1715 ep->maxpacket = 64;
1716 break;
1717 case 4 ... 5:
1718 ep->maxpacket = 256;
1719 break;
1720 }
1721 }
1722
1723 udc->matrix = syscon_regmap_lookup_by_phandle(udc->pdev->dev.of_node,
1724 "atmel,matrix");
1725 return PTR_ERR_OR_ZERO(udc->matrix);
1726 }
1727
1728 static void at91sam9261_udc_pullup(struct at91_udc *udc, int is_on)
1729 {
1730 u32 usbpucr = 0;
1731
1732 if (is_on)
1733 usbpucr = AT91_MATRIX_USBPUCR_PUON;
1734
1735 regmap_update_bits(udc->matrix, AT91SAM9261_MATRIX_USBPUCR,
1736 AT91_MATRIX_USBPUCR_PUON, usbpucr);
1737 }
1738
1739 static const struct at91_udc_caps at91sam9261_udc_caps = {
1740 .init = at91sam9261_udc_init,
1741 .pullup = at91sam9261_udc_pullup,
1742 };
1743
1744 static int at91sam9263_udc_init(struct at91_udc *udc)
1745 {
1746 struct at91_ep *ep;
1747 int i;
1748
1749 for (i = 0; i < NUM_ENDPOINTS; i++) {
1750 ep = &udc->ep[i];
1751
1752 switch (i) {
1753 case 0:
1754 case 1:
1755 case 2:
1756 case 3:
1757 ep->maxpacket = 64;
1758 break;
1759 case 4:
1760 case 5:
1761 ep->maxpacket = 256;
1762 break;
1763 }
1764 }
1765
1766 return 0;
1767 }
1768
1769 static const struct at91_udc_caps at91sam9263_udc_caps = {
1770 .init = at91sam9263_udc_init,
1771 .pullup = at91sam9260_udc_pullup,
1772 };
1773
1774 static const struct of_device_id at91_udc_dt_ids[] = {
1775 {
1776 .compatible = "atmel,at91rm9200-udc",
1777 .data = &at91rm9200_udc_caps,
1778 },
1779 {
1780 .compatible = "atmel,at91sam9260-udc",
1781 .data = &at91sam9260_udc_caps,
1782 },
1783 {
1784 .compatible = "atmel,at91sam9261-udc",
1785 .data = &at91sam9261_udc_caps,
1786 },
1787 {
1788 .compatible = "atmel,at91sam9263-udc",
1789 .data = &at91sam9263_udc_caps,
1790 },
1791 { /* sentinel */ }
1792 };
1793 MODULE_DEVICE_TABLE(of, at91_udc_dt_ids);
1794
1795 static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
1796 {
1797 struct at91_udc_data *board = &udc->board;
1798 const struct of_device_id *match;
1799 enum of_gpio_flags flags;
1800 u32 val;
1801
1802 if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
1803 board->vbus_polled = 1;
1804
1805 board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1806 &flags);
1807 board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1808
1809 board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
1810 &flags);
1811
1812 board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1813
1814 match = of_match_node(at91_udc_dt_ids, np);
1815 if (match)
1816 udc->caps = match->data;
1817 }
1818
1819 static int at91udc_probe(struct platform_device *pdev)
1820 {
1821 struct device *dev = &pdev->dev;
1822 struct at91_udc *udc;
1823 int retval;
1824 struct resource *res;
1825 struct at91_ep *ep;
1826 int i;
1827
1828 udc = devm_kzalloc(dev, sizeof(*udc), GFP_KERNEL);
1829 if (!udc)
1830 return -ENOMEM;
1831
1832 /* init software state */
1833 udc->gadget.dev.parent = dev;
1834 at91udc_of_init(udc, pdev->dev.of_node);
1835 udc->pdev = pdev;
1836 udc->enabled = 0;
1837 spin_lock_init(&udc->lock);
1838
1839 udc->gadget.ops = &at91_udc_ops;
1840 udc->gadget.ep0 = &udc->ep[0].ep;
1841 udc->gadget.name = driver_name;
1842 udc->gadget.dev.init_name = "gadget";
1843
1844 for (i = 0; i < NUM_ENDPOINTS; i++) {
1845 ep = &udc->ep[i];
1846 ep->ep.name = ep_info[i].name;
1847 ep->ep.caps = ep_info[i].caps;
1848 ep->ep.ops = &at91_ep_ops;
1849 ep->udc = udc;
1850 ep->int_mask = BIT(i);
1851 if (i != 0 && i != 3)
1852 ep->is_pingpong = 1;
1853 }
1854
1855 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1856 udc->udp_baseaddr = devm_ioremap_resource(dev, res);
1857 if (IS_ERR(udc->udp_baseaddr))
1858 return PTR_ERR(udc->udp_baseaddr);
1859
1860 if (udc->caps && udc->caps->init) {
1861 retval = udc->caps->init(udc);
1862 if (retval)
1863 return retval;
1864 }
1865
1866 udc_reinit(udc);
1867
1868 /* get interface and function clocks */
1869 udc->iclk = devm_clk_get(dev, "pclk");
1870 if (IS_ERR(udc->iclk))
1871 return PTR_ERR(udc->iclk);
1872
1873 udc->fclk = devm_clk_get(dev, "hclk");
1874 if (IS_ERR(udc->fclk))
1875 return PTR_ERR(udc->fclk);
1876
1877 /* don't do anything until we have both gadget driver and VBUS */
1878 clk_set_rate(udc->fclk, 48000000);
1879 retval = clk_prepare(udc->fclk);
1880 if (retval)
1881 return retval;
1882
1883 retval = clk_prepare_enable(udc->iclk);
1884 if (retval)
1885 goto err_unprepare_fclk;
1886
1887 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1888 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1889 /* Clear all pending interrupts - UDP may be used by bootloader. */
1890 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1891 clk_disable(udc->iclk);
1892
1893 /* request UDC and maybe VBUS irqs */
1894 udc->udp_irq = platform_get_irq(pdev, 0);
1895 retval = devm_request_irq(dev, udc->udp_irq, at91_udc_irq, 0,
1896 driver_name, udc);
1897 if (retval) {
1898 DBG("request irq %d failed\n", udc->udp_irq);
1899 goto err_unprepare_iclk;
1900 }
1901
1902 if (gpio_is_valid(udc->board.vbus_pin)) {
1903 retval = devm_gpio_request(dev, udc->board.vbus_pin,
1904 "udc_vbus");
1905 if (retval) {
1906 DBG("request vbus pin failed\n");
1907 goto err_unprepare_iclk;
1908 }
1909
1910 gpio_direction_input(udc->board.vbus_pin);
1911
1912 /*
1913 * Get the initial state of VBUS - we cannot expect
1914 * a pending interrupt.
1915 */
1916 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1917 udc->board.vbus_active_low;
1918
1919 if (udc->board.vbus_polled) {
1920 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1921 timer_setup(&udc->vbus_timer, at91_vbus_timer, 0);
1922 mod_timer(&udc->vbus_timer,
1923 jiffies + VBUS_POLL_TIMEOUT);
1924 } else {
1925 retval = devm_request_irq(dev,
1926 gpio_to_irq(udc->board.vbus_pin),
1927 at91_vbus_irq, 0, driver_name, udc);
1928 if (retval) {
1929 DBG("request vbus irq %d failed\n",
1930 udc->board.vbus_pin);
1931 goto err_unprepare_iclk;
1932 }
1933 }
1934 } else {
1935 DBG("no VBUS detection, assuming always-on\n");
1936 udc->vbus = 1;
1937 }
1938 retval = usb_add_gadget_udc(dev, &udc->gadget);
1939 if (retval)
1940 goto err_unprepare_iclk;
1941 dev_set_drvdata(dev, udc);
1942 device_init_wakeup(dev, 1);
1943 create_debug_file(udc);
1944
1945 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1946 return 0;
1947
1948 err_unprepare_iclk:
1949 clk_unprepare(udc->iclk);
1950 err_unprepare_fclk:
1951 clk_unprepare(udc->fclk);
1952
1953 DBG("%s probe failed, %d\n", driver_name, retval);
1954
1955 return retval;
1956 }
1957
1958 static int at91udc_remove(struct platform_device *pdev)
1959 {
1960 struct at91_udc *udc = platform_get_drvdata(pdev);
1961 unsigned long flags;
1962
1963 DBG("remove\n");
1964
1965 usb_del_gadget_udc(&udc->gadget);
1966 if (udc->driver)
1967 return -EBUSY;
1968
1969 spin_lock_irqsave(&udc->lock, flags);
1970 pullup(udc, 0);
1971 spin_unlock_irqrestore(&udc->lock, flags);
1972
1973 device_init_wakeup(&pdev->dev, 0);
1974 remove_debug_file(udc);
1975 clk_unprepare(udc->fclk);
1976 clk_unprepare(udc->iclk);
1977
1978 return 0;
1979 }
1980
1981 #ifdef CONFIG_PM
1982 static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1983 {
1984 struct at91_udc *udc = platform_get_drvdata(pdev);
1985 int wake = udc->driver && device_may_wakeup(&pdev->dev);
1986 unsigned long flags;
1987
1988 /* Unless we can act normally to the host (letting it wake us up
1989 * whenever it has work for us) force disconnect. Wakeup requires
1990 * PLLB for USB events (signaling for reset, wakeup, or incoming
1991 * tokens) and VBUS irqs (on systems which support them).
1992 */
1993 if ((!udc->suspended && udc->addr)
1994 || !wake
1995 || at91_suspend_entering_slow_clock()) {
1996 spin_lock_irqsave(&udc->lock, flags);
1997 pullup(udc, 0);
1998 wake = 0;
1999 spin_unlock_irqrestore(&udc->lock, flags);
2000 } else
2001 enable_irq_wake(udc->udp_irq);
2002
2003 udc->active_suspend = wake;
2004 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
2005 enable_irq_wake(udc->board.vbus_pin);
2006 return 0;
2007 }
2008
2009 static int at91udc_resume(struct platform_device *pdev)
2010 {
2011 struct at91_udc *udc = platform_get_drvdata(pdev);
2012 unsigned long flags;
2013
2014 if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
2015 udc->active_suspend)
2016 disable_irq_wake(udc->board.vbus_pin);
2017
2018 /* maybe reconnect to host; if so, clocks on */
2019 if (udc->active_suspend)
2020 disable_irq_wake(udc->udp_irq);
2021 else {
2022 spin_lock_irqsave(&udc->lock, flags);
2023 pullup(udc, 1);
2024 spin_unlock_irqrestore(&udc->lock, flags);
2025 }
2026 return 0;
2027 }
2028 #else
2029 #define at91udc_suspend NULL
2030 #define at91udc_resume NULL
2031 #endif
2032
2033 static struct platform_driver at91_udc_driver = {
2034 .remove = at91udc_remove,
2035 .shutdown = at91udc_shutdown,
2036 .suspend = at91udc_suspend,
2037 .resume = at91udc_resume,
2038 .driver = {
2039 .name = (char *) driver_name,
2040 .of_match_table = at91_udc_dt_ids,
2041 },
2042 };
2043
2044 module_platform_driver_probe(at91_udc_driver, at91udc_probe);
2045
2046 MODULE_DESCRIPTION("AT91 udc driver");
2047 MODULE_AUTHOR("Thomas Rathbone, David Brownell");
2048 MODULE_LICENSE("GPL");
2049 MODULE_ALIAS("platform:at91_udc");
CRIS linux kernel tree