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