/drivers/usb/gadget/at91_udc.c
C | 1998 lines | 1451 code | 275 blank | 272 comment | 301 complexity | 1d153ce5cf415847f082291b383643cc MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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1/*
2 * at91_udc -- driver for at91-series USB peripheral controller
3 *
4 * Copyright (C) 2004 by Thomas Rathbone
5 * Copyright (C) 2005 by HP Labs
6 * Copyright (C) 2005 by David Brownell
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
22 */
23
24#undef VERBOSE_DEBUG
25#undef PACKET_TRACE
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/platform_device.h>
30#include <linux/delay.h>
31#include <linux/ioport.h>
32#include <linux/slab.h>
33#include <linux/errno.h>
34#include <linux/init.h>
35#include <linux/list.h>
36#include <linux/interrupt.h>
37#include <linux/proc_fs.h>
38#include <linux/clk.h>
39#include <linux/usb/ch9.h>
40#include <linux/usb/gadget.h>
41#include <linux/prefetch.h>
42
43#include <asm/byteorder.h>
44#include <mach/hardware.h>
45#include <asm/io.h>
46#include <asm/irq.h>
47#include <asm/system.h>
48#include <asm/gpio.h>
49
50#include <mach/board.h>
51#include <mach/cpu.h>
52#include <mach/at91sam9261_matrix.h>
53
54#include "at91_udc.h"
55
56
57/*
58 * This controller is simple and PIO-only. It's used in many AT91-series
59 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
60 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
61 *
62 * This driver expects the board has been wired with two GPIOs suppporting
63 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
64 * testing hasn't covered such cases.)
65 *
66 * The pullup is most important (so it's integrated on sam926x parts). It
67 * provides software control over whether the host enumerates the device.
68 *
69 * The VBUS sensing helps during enumeration, and allows both USB clocks
70 * (and the transceiver) to stay gated off until they're necessary, saving
71 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
72 * it may also be gated off by software during some Linux sleep states.
73 */
74
75#define DRIVER_VERSION "3 May 2006"
76
77static const char driver_name [] = "at91_udc";
78static const char ep0name[] = "ep0";
79
80#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
81
82#define at91_udp_read(udc, reg) \
83 __raw_readl((udc)->udp_baseaddr + (reg))
84#define at91_udp_write(udc, reg, val) \
85 __raw_writel((val), (udc)->udp_baseaddr + (reg))
86
87/*-------------------------------------------------------------------------*/
88
89#ifdef CONFIG_USB_GADGET_DEBUG_FILES
90
91#include <linux/seq_file.h>
92
93static const char debug_filename[] = "driver/udc";
94
95#define FOURBITS "%s%s%s%s"
96#define EIGHTBITS FOURBITS FOURBITS
97
98static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
99{
100 static char *types[] = {
101 "control", "out-iso", "out-bulk", "out-int",
102 "BOGUS", "in-iso", "in-bulk", "in-int"};
103
104 u32 csr;
105 struct at91_request *req;
106 unsigned long flags;
107 struct at91_udc *udc = ep->udc;
108
109 spin_lock_irqsave(&udc->lock, flags);
110
111 csr = __raw_readl(ep->creg);
112
113 /* NOTE: not collecting per-endpoint irq statistics... */
114
115 seq_printf(s, "\n");
116 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
117 ep->ep.name, ep->ep.maxpacket,
118 ep->is_in ? "in" : "out",
119 ep->is_iso ? " iso" : "",
120 ep->is_pingpong
121 ? (ep->fifo_bank ? "pong" : "ping")
122 : "",
123 ep->stopped ? " stopped" : "");
124 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
125 csr,
126 (csr & 0x07ff0000) >> 16,
127 (csr & (1 << 15)) ? "enabled" : "disabled",
128 (csr & (1 << 11)) ? "DATA1" : "DATA0",
129 types[(csr & 0x700) >> 8],
130
131 /* iff type is control then print current direction */
132 (!(csr & 0x700))
133 ? ((csr & (1 << 7)) ? " IN" : " OUT")
134 : "",
135 (csr & (1 << 6)) ? " rxdatabk1" : "",
136 (csr & (1 << 5)) ? " forcestall" : "",
137 (csr & (1 << 4)) ? " txpktrdy" : "",
138
139 (csr & (1 << 3)) ? " stallsent" : "",
140 (csr & (1 << 2)) ? " rxsetup" : "",
141 (csr & (1 << 1)) ? " rxdatabk0" : "",
142 (csr & (1 << 0)) ? " txcomp" : "");
143 if (list_empty (&ep->queue))
144 seq_printf(s, "\t(queue empty)\n");
145
146 else list_for_each_entry (req, &ep->queue, queue) {
147 unsigned length = req->req.actual;
148
149 seq_printf(s, "\treq %p len %d/%d buf %p\n",
150 &req->req, length,
151 req->req.length, req->req.buf);
152 }
153 spin_unlock_irqrestore(&udc->lock, flags);
154}
155
156static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
157{
158 int i;
159
160 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
161 (mask & (1 << 13)) ? " wakeup" : "",
162 (mask & (1 << 12)) ? " endbusres" : "",
163
164 (mask & (1 << 11)) ? " sofint" : "",
165 (mask & (1 << 10)) ? " extrsm" : "",
166 (mask & (1 << 9)) ? " rxrsm" : "",
167 (mask & (1 << 8)) ? " rxsusp" : "");
168 for (i = 0; i < 8; i++) {
169 if (mask & (1 << i))
170 seq_printf(s, " ep%d", i);
171 }
172 seq_printf(s, "\n");
173}
174
175static int proc_udc_show(struct seq_file *s, void *unused)
176{
177 struct at91_udc *udc = s->private;
178 struct at91_ep *ep;
179 u32 tmp;
180
181 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
182
183 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
184 udc->vbus ? "present" : "off",
185 udc->enabled
186 ? (udc->vbus ? "active" : "enabled")
187 : "disabled",
188 udc->selfpowered ? "self" : "VBUS",
189 udc->suspended ? ", suspended" : "",
190 udc->driver ? udc->driver->driver.name : "(none)");
191
192 /* don't access registers when interface isn't clocked */
193 if (!udc->clocked) {
194 seq_printf(s, "(not clocked)\n");
195 return 0;
196 }
197
198 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
199 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
200 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
201 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
202 (tmp & AT91_UDP_NUM));
203
204 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
205 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
206 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
207 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
208 (tmp & AT91_UDP_ESR) ? " esr" : "",
209 (tmp & AT91_UDP_CONFG) ? " confg" : "",
210 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
211
212 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
213 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
214 (tmp & AT91_UDP_FEN) ? " fen" : "",
215 (tmp & AT91_UDP_FADD));
216
217 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
218 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
219
220 if (udc->enabled && udc->vbus) {
221 proc_ep_show(s, &udc->ep[0]);
222 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
223 if (ep->desc)
224 proc_ep_show(s, ep);
225 }
226 }
227 return 0;
228}
229
230static int proc_udc_open(struct inode *inode, struct file *file)
231{
232 return single_open(file, proc_udc_show, PDE(inode)->data);
233}
234
235static const struct file_operations proc_ops = {
236 .owner = THIS_MODULE,
237 .open = proc_udc_open,
238 .read = seq_read,
239 .llseek = seq_lseek,
240 .release = single_release,
241};
242
243static void create_debug_file(struct at91_udc *udc)
244{
245 udc->pde = proc_create_data(debug_filename, 0, NULL, &proc_ops, udc);
246}
247
248static void remove_debug_file(struct at91_udc *udc)
249{
250 if (udc->pde)
251 remove_proc_entry(debug_filename, NULL);
252}
253
254#else
255
256static inline void create_debug_file(struct at91_udc *udc) {}
257static inline void remove_debug_file(struct at91_udc *udc) {}
258
259#endif
260
261
262/*-------------------------------------------------------------------------*/
263
264static void done(struct at91_ep *ep, struct at91_request *req, int status)
265{
266 unsigned stopped = ep->stopped;
267 struct at91_udc *udc = ep->udc;
268
269 list_del_init(&req->queue);
270 if (req->req.status == -EINPROGRESS)
271 req->req.status = status;
272 else
273 status = req->req.status;
274 if (status && status != -ESHUTDOWN)
275 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
276
277 ep->stopped = 1;
278 spin_unlock(&udc->lock);
279 req->req.complete(&ep->ep, &req->req);
280 spin_lock(&udc->lock);
281 ep->stopped = stopped;
282
283 /* ep0 is always ready; other endpoints need a non-empty queue */
284 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
285 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
286}
287
288/*-------------------------------------------------------------------------*/
289
290/* bits indicating OUT fifo has data ready */
291#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
292
293/*
294 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
295 * back most of the value you just read (because of side effects, including
296 * bits that may change after reading and before writing).
297 *
298 * Except when changing a specific bit, always write values which:
299 * - clear SET_FX bits (setting them could change something)
300 * - set CLR_FX bits (clearing them could change something)
301 *
302 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
303 * that shouldn't normally be changed.
304 *
305 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
306 * implying a need to wait for one write to complete (test relevant bits)
307 * before starting the next write. This shouldn't be an issue given how
308 * infrequently we write, except maybe for write-then-read idioms.
309 */
310#define SET_FX (AT91_UDP_TXPKTRDY)
311#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
312 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
313
314/* pull OUT packet data from the endpoint's fifo */
315static int read_fifo (struct at91_ep *ep, struct at91_request *req)
316{
317 u32 __iomem *creg = ep->creg;
318 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
319 u32 csr;
320 u8 *buf;
321 unsigned int count, bufferspace, is_done;
322
323 buf = req->req.buf + req->req.actual;
324 bufferspace = req->req.length - req->req.actual;
325
326 /*
327 * there might be nothing to read if ep_queue() calls us,
328 * or if we already emptied both pingpong buffers
329 */
330rescan:
331 csr = __raw_readl(creg);
332 if ((csr & RX_DATA_READY) == 0)
333 return 0;
334
335 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
336 if (count > ep->ep.maxpacket)
337 count = ep->ep.maxpacket;
338 if (count > bufferspace) {
339 DBG("%s buffer overflow\n", ep->ep.name);
340 req->req.status = -EOVERFLOW;
341 count = bufferspace;
342 }
343 __raw_readsb(dreg, buf, count);
344
345 /* release and swap pingpong mem bank */
346 csr |= CLR_FX;
347 if (ep->is_pingpong) {
348 if (ep->fifo_bank == 0) {
349 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
350 ep->fifo_bank = 1;
351 } else {
352 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
353 ep->fifo_bank = 0;
354 }
355 } else
356 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
357 __raw_writel(csr, creg);
358
359 req->req.actual += count;
360 is_done = (count < ep->ep.maxpacket);
361 if (count == bufferspace)
362 is_done = 1;
363
364 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
365 is_done ? " (done)" : "");
366
367 /*
368 * avoid extra trips through IRQ logic for packets already in
369 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
370 */
371 if (is_done)
372 done(ep, req, 0);
373 else if (ep->is_pingpong) {
374 /*
375 * One dummy read to delay the code because of a HW glitch:
376 * CSR returns bad RXCOUNT when read too soon after updating
377 * RX_DATA_BK flags.
378 */
379 csr = __raw_readl(creg);
380
381 bufferspace -= count;
382 buf += count;
383 goto rescan;
384 }
385
386 return is_done;
387}
388
389/* load fifo for an IN packet */
390static int write_fifo(struct at91_ep *ep, struct at91_request *req)
391{
392 u32 __iomem *creg = ep->creg;
393 u32 csr = __raw_readl(creg);
394 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
395 unsigned total, count, is_last;
396 u8 *buf;
397
398 /*
399 * TODO: allow for writing two packets to the fifo ... that'll
400 * reduce the amount of IN-NAKing, but probably won't affect
401 * throughput much. (Unlike preventing OUT-NAKing!)
402 */
403
404 /*
405 * If ep_queue() calls us, the queue is empty and possibly in
406 * odd states like TXCOMP not yet cleared (we do it, saving at
407 * least one IRQ) or the fifo not yet being free. Those aren't
408 * issues normally (IRQ handler fast path).
409 */
410 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
411 if (csr & AT91_UDP_TXCOMP) {
412 csr |= CLR_FX;
413 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
414 __raw_writel(csr, creg);
415 csr = __raw_readl(creg);
416 }
417 if (csr & AT91_UDP_TXPKTRDY)
418 return 0;
419 }
420
421 buf = req->req.buf + req->req.actual;
422 prefetch(buf);
423 total = req->req.length - req->req.actual;
424 if (ep->ep.maxpacket < total) {
425 count = ep->ep.maxpacket;
426 is_last = 0;
427 } else {
428 count = total;
429 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
430 }
431
432 /*
433 * Write the packet, maybe it's a ZLP.
434 *
435 * NOTE: incrementing req->actual before we receive the ACK means
436 * gadget driver IN bytecounts can be wrong in fault cases. That's
437 * fixable with PIO drivers like this one (save "count" here, and
438 * do the increment later on TX irq), but not for most DMA hardware.
439 *
440 * So all gadget drivers must accept that potential error. Some
441 * hardware supports precise fifo status reporting, letting them
442 * recover when the actual bytecount matters (e.g. for USB Test
443 * and Measurement Class devices).
444 */
445 __raw_writesb(dreg, buf, count);
446 csr &= ~SET_FX;
447 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
448 __raw_writel(csr, creg);
449 req->req.actual += count;
450
451 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
452 is_last ? " (done)" : "");
453 if (is_last)
454 done(ep, req, 0);
455 return is_last;
456}
457
458static void nuke(struct at91_ep *ep, int status)
459{
460 struct at91_request *req;
461
462 // terminer chaque requete dans la queue
463 ep->stopped = 1;
464 if (list_empty(&ep->queue))
465 return;
466
467 VDBG("%s %s\n", __func__, ep->ep.name);
468 while (!list_empty(&ep->queue)) {
469 req = list_entry(ep->queue.next, struct at91_request, queue);
470 done(ep, req, status);
471 }
472}
473
474/*-------------------------------------------------------------------------*/
475
476static int at91_ep_enable(struct usb_ep *_ep,
477 const struct usb_endpoint_descriptor *desc)
478{
479 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
480 struct at91_udc *udc = ep->udc;
481 u16 maxpacket;
482 u32 tmp;
483 unsigned long flags;
484
485 if (!_ep || !ep
486 || !desc || ep->desc
487 || _ep->name == ep0name
488 || desc->bDescriptorType != USB_DT_ENDPOINT
489 || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0
490 || maxpacket > ep->maxpacket) {
491 DBG("bad ep or descriptor\n");
492 return -EINVAL;
493 }
494
495 if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
496 DBG("bogus device state\n");
497 return -ESHUTDOWN;
498 }
499
500 tmp = usb_endpoint_type(desc);
501 switch (tmp) {
502 case USB_ENDPOINT_XFER_CONTROL:
503 DBG("only one control endpoint\n");
504 return -EINVAL;
505 case USB_ENDPOINT_XFER_INT:
506 if (maxpacket > 64)
507 goto bogus_max;
508 break;
509 case USB_ENDPOINT_XFER_BULK:
510 switch (maxpacket) {
511 case 8:
512 case 16:
513 case 32:
514 case 64:
515 goto ok;
516 }
517bogus_max:
518 DBG("bogus maxpacket %d\n", maxpacket);
519 return -EINVAL;
520 case USB_ENDPOINT_XFER_ISOC:
521 if (!ep->is_pingpong) {
522 DBG("iso requires double buffering\n");
523 return -EINVAL;
524 }
525 break;
526 }
527
528ok:
529 spin_lock_irqsave(&udc->lock, flags);
530
531 /* initialize endpoint to match this descriptor */
532 ep->is_in = usb_endpoint_dir_in(desc);
533 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
534 ep->stopped = 0;
535 if (ep->is_in)
536 tmp |= 0x04;
537 tmp <<= 8;
538 tmp |= AT91_UDP_EPEDS;
539 __raw_writel(tmp, ep->creg);
540
541 ep->desc = desc;
542 ep->ep.maxpacket = maxpacket;
543
544 /*
545 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
546 * since endpoint resets don't reset hw pingpong state.
547 */
548 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
549 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
550
551 spin_unlock_irqrestore(&udc->lock, flags);
552 return 0;
553}
554
555static int at91_ep_disable (struct usb_ep * _ep)
556{
557 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
558 struct at91_udc *udc = ep->udc;
559 unsigned long flags;
560
561 if (ep == &ep->udc->ep[0])
562 return -EINVAL;
563
564 spin_lock_irqsave(&udc->lock, flags);
565
566 nuke(ep, -ESHUTDOWN);
567
568 /* restore the endpoint's pristine config */
569 ep->desc = NULL;
570 ep->ep.maxpacket = ep->maxpacket;
571
572 /* reset fifos and endpoint */
573 if (ep->udc->clocked) {
574 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
575 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
576 __raw_writel(0, ep->creg);
577 }
578
579 spin_unlock_irqrestore(&udc->lock, flags);
580 return 0;
581}
582
583/*
584 * this is a PIO-only driver, so there's nothing
585 * interesting for request or buffer allocation.
586 */
587
588static struct usb_request *
589at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
590{
591 struct at91_request *req;
592
593 req = kzalloc(sizeof (struct at91_request), gfp_flags);
594 if (!req)
595 return NULL;
596
597 INIT_LIST_HEAD(&req->queue);
598 return &req->req;
599}
600
601static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
602{
603 struct at91_request *req;
604
605 req = container_of(_req, struct at91_request, req);
606 BUG_ON(!list_empty(&req->queue));
607 kfree(req);
608}
609
610static int at91_ep_queue(struct usb_ep *_ep,
611 struct usb_request *_req, gfp_t gfp_flags)
612{
613 struct at91_request *req;
614 struct at91_ep *ep;
615 struct at91_udc *udc;
616 int status;
617 unsigned long flags;
618
619 req = container_of(_req, struct at91_request, req);
620 ep = container_of(_ep, struct at91_ep, ep);
621
622 if (!_req || !_req->complete
623 || !_req->buf || !list_empty(&req->queue)) {
624 DBG("invalid request\n");
625 return -EINVAL;
626 }
627
628 if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
629 DBG("invalid ep\n");
630 return -EINVAL;
631 }
632
633 udc = ep->udc;
634
635 if (!udc || !udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
636 DBG("invalid device\n");
637 return -EINVAL;
638 }
639
640 _req->status = -EINPROGRESS;
641 _req->actual = 0;
642
643 spin_lock_irqsave(&udc->lock, flags);
644
645 /* try to kickstart any empty and idle queue */
646 if (list_empty(&ep->queue) && !ep->stopped) {
647 int is_ep0;
648
649 /*
650 * If this control request has a non-empty DATA stage, this
651 * will start that stage. It works just like a non-control
652 * request (until the status stage starts, maybe early).
653 *
654 * If the data stage is empty, then this starts a successful
655 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
656 */
657 is_ep0 = (ep->ep.name == ep0name);
658 if (is_ep0) {
659 u32 tmp;
660
661 if (!udc->req_pending) {
662 status = -EINVAL;
663 goto done;
664 }
665
666 /*
667 * defer changing CONFG until after the gadget driver
668 * reconfigures the endpoints.
669 */
670 if (udc->wait_for_config_ack) {
671 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
672 tmp ^= AT91_UDP_CONFG;
673 VDBG("toggle config\n");
674 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
675 }
676 if (req->req.length == 0) {
677ep0_in_status:
678 PACKET("ep0 in/status\n");
679 status = 0;
680 tmp = __raw_readl(ep->creg);
681 tmp &= ~SET_FX;
682 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
683 __raw_writel(tmp, ep->creg);
684 udc->req_pending = 0;
685 goto done;
686 }
687 }
688
689 if (ep->is_in)
690 status = write_fifo(ep, req);
691 else {
692 status = read_fifo(ep, req);
693
694 /* IN/STATUS stage is otherwise triggered by irq */
695 if (status && is_ep0)
696 goto ep0_in_status;
697 }
698 } else
699 status = 0;
700
701 if (req && !status) {
702 list_add_tail (&req->queue, &ep->queue);
703 at91_udp_write(udc, AT91_UDP_IER, ep->int_mask);
704 }
705done:
706 spin_unlock_irqrestore(&udc->lock, flags);
707 return (status < 0) ? status : 0;
708}
709
710static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
711{
712 struct at91_ep *ep;
713 struct at91_request *req;
714 unsigned long flags;
715 struct at91_udc *udc;
716
717 ep = container_of(_ep, struct at91_ep, ep);
718 if (!_ep || ep->ep.name == ep0name)
719 return -EINVAL;
720
721 udc = ep->udc;
722
723 spin_lock_irqsave(&udc->lock, flags);
724
725 /* make sure it's actually queued on this endpoint */
726 list_for_each_entry (req, &ep->queue, queue) {
727 if (&req->req == _req)
728 break;
729 }
730 if (&req->req != _req) {
731 spin_unlock_irqrestore(&udc->lock, flags);
732 return -EINVAL;
733 }
734
735 done(ep, req, -ECONNRESET);
736 spin_unlock_irqrestore(&udc->lock, flags);
737 return 0;
738}
739
740static int at91_ep_set_halt(struct usb_ep *_ep, int value)
741{
742 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
743 struct at91_udc *udc = ep->udc;
744 u32 __iomem *creg;
745 u32 csr;
746 unsigned long flags;
747 int status = 0;
748
749 if (!_ep || ep->is_iso || !ep->udc->clocked)
750 return -EINVAL;
751
752 creg = ep->creg;
753 spin_lock_irqsave(&udc->lock, flags);
754
755 csr = __raw_readl(creg);
756
757 /*
758 * fail with still-busy IN endpoints, ensuring correct sequencing
759 * of data tx then stall. note that the fifo rx bytecount isn't
760 * completely accurate as a tx bytecount.
761 */
762 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
763 status = -EAGAIN;
764 else {
765 csr |= CLR_FX;
766 csr &= ~SET_FX;
767 if (value) {
768 csr |= AT91_UDP_FORCESTALL;
769 VDBG("halt %s\n", ep->ep.name);
770 } else {
771 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
772 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
773 csr &= ~AT91_UDP_FORCESTALL;
774 }
775 __raw_writel(csr, creg);
776 }
777
778 spin_unlock_irqrestore(&udc->lock, flags);
779 return status;
780}
781
782static const struct usb_ep_ops at91_ep_ops = {
783 .enable = at91_ep_enable,
784 .disable = at91_ep_disable,
785 .alloc_request = at91_ep_alloc_request,
786 .free_request = at91_ep_free_request,
787 .queue = at91_ep_queue,
788 .dequeue = at91_ep_dequeue,
789 .set_halt = at91_ep_set_halt,
790 // there's only imprecise fifo status reporting
791};
792
793/*-------------------------------------------------------------------------*/
794
795static int at91_get_frame(struct usb_gadget *gadget)
796{
797 struct at91_udc *udc = to_udc(gadget);
798
799 if (!to_udc(gadget)->clocked)
800 return -EINVAL;
801 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
802}
803
804static int at91_wakeup(struct usb_gadget *gadget)
805{
806 struct at91_udc *udc = to_udc(gadget);
807 u32 glbstate;
808 int status = -EINVAL;
809 unsigned long flags;
810
811 DBG("%s\n", __func__ );
812 spin_lock_irqsave(&udc->lock, flags);
813
814 if (!udc->clocked || !udc->suspended)
815 goto done;
816
817 /* NOTE: some "early versions" handle ESR differently ... */
818
819 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
820 if (!(glbstate & AT91_UDP_ESR))
821 goto done;
822 glbstate |= AT91_UDP_ESR;
823 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
824
825done:
826 spin_unlock_irqrestore(&udc->lock, flags);
827 return status;
828}
829
830/* reinit == restore initial software state */
831static void udc_reinit(struct at91_udc *udc)
832{
833 u32 i;
834
835 INIT_LIST_HEAD(&udc->gadget.ep_list);
836 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
837
838 for (i = 0; i < NUM_ENDPOINTS; i++) {
839 struct at91_ep *ep = &udc->ep[i];
840
841 if (i != 0)
842 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
843 ep->desc = NULL;
844 ep->stopped = 0;
845 ep->fifo_bank = 0;
846 ep->ep.maxpacket = ep->maxpacket;
847 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
848 // initialiser une queue par endpoint
849 INIT_LIST_HEAD(&ep->queue);
850 }
851}
852
853static void stop_activity(struct at91_udc *udc)
854{
855 struct usb_gadget_driver *driver = udc->driver;
856 int i;
857
858 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
859 driver = NULL;
860 udc->gadget.speed = USB_SPEED_UNKNOWN;
861 udc->suspended = 0;
862
863 for (i = 0; i < NUM_ENDPOINTS; i++) {
864 struct at91_ep *ep = &udc->ep[i];
865 ep->stopped = 1;
866 nuke(ep, -ESHUTDOWN);
867 }
868 if (driver) {
869 spin_unlock(&udc->lock);
870 driver->disconnect(&udc->gadget);
871 spin_lock(&udc->lock);
872 }
873
874 udc_reinit(udc);
875}
876
877static void clk_on(struct at91_udc *udc)
878{
879 if (udc->clocked)
880 return;
881 udc->clocked = 1;
882 clk_enable(udc->iclk);
883 clk_enable(udc->fclk);
884}
885
886static void clk_off(struct at91_udc *udc)
887{
888 if (!udc->clocked)
889 return;
890 udc->clocked = 0;
891 udc->gadget.speed = USB_SPEED_UNKNOWN;
892 clk_disable(udc->fclk);
893 clk_disable(udc->iclk);
894}
895
896/*
897 * activate/deactivate link with host; minimize power usage for
898 * inactive links by cutting clocks and transceiver power.
899 */
900static void pullup(struct at91_udc *udc, int is_on)
901{
902 int active = !udc->board.pullup_active_low;
903
904 if (!udc->enabled || !udc->vbus)
905 is_on = 0;
906 DBG("%sactive\n", is_on ? "" : "in");
907
908 if (is_on) {
909 clk_on(udc);
910 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
911 at91_udp_write(udc, AT91_UDP_TXVC, 0);
912 if (cpu_is_at91rm9200())
913 gpio_set_value(udc->board.pullup_pin, active);
914 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
915 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
916
917 txvc |= AT91_UDP_TXVC_PUON;
918 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
919 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
920 u32 usbpucr;
921
922 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
923 usbpucr |= AT91_MATRIX_USBPUCR_PUON;
924 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
925 }
926 } else {
927 stop_activity(udc);
928 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
929 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
930 if (cpu_is_at91rm9200())
931 gpio_set_value(udc->board.pullup_pin, !active);
932 else if (cpu_is_at91sam9260() || cpu_is_at91sam9263() || cpu_is_at91sam9g20()) {
933 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
934
935 txvc &= ~AT91_UDP_TXVC_PUON;
936 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
937 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
938 u32 usbpucr;
939
940 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
941 usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
942 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
943 }
944 clk_off(udc);
945 }
946}
947
948/* vbus is here! turn everything on that's ready */
949static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
950{
951 struct at91_udc *udc = to_udc(gadget);
952 unsigned long flags;
953
954 // VDBG("vbus %s\n", is_active ? "on" : "off");
955 spin_lock_irqsave(&udc->lock, flags);
956 udc->vbus = (is_active != 0);
957 if (udc->driver)
958 pullup(udc, is_active);
959 else
960 pullup(udc, 0);
961 spin_unlock_irqrestore(&udc->lock, flags);
962 return 0;
963}
964
965static int at91_pullup(struct usb_gadget *gadget, int is_on)
966{
967 struct at91_udc *udc = to_udc(gadget);
968 unsigned long flags;
969
970 spin_lock_irqsave(&udc->lock, flags);
971 udc->enabled = is_on = !!is_on;
972 pullup(udc, is_on);
973 spin_unlock_irqrestore(&udc->lock, flags);
974 return 0;
975}
976
977static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
978{
979 struct at91_udc *udc = to_udc(gadget);
980 unsigned long flags;
981
982 spin_lock_irqsave(&udc->lock, flags);
983 udc->selfpowered = (is_on != 0);
984 spin_unlock_irqrestore(&udc->lock, flags);
985 return 0;
986}
987
988static const struct usb_gadget_ops at91_udc_ops = {
989 .get_frame = at91_get_frame,
990 .wakeup = at91_wakeup,
991 .set_selfpowered = at91_set_selfpowered,
992 .vbus_session = at91_vbus_session,
993 .pullup = at91_pullup,
994
995 /*
996 * VBUS-powered devices may also also want to support bigger
997 * power budgets after an appropriate SET_CONFIGURATION.
998 */
999 // .vbus_power = at91_vbus_power,
1000};
1001
1002/*-------------------------------------------------------------------------*/
1003
1004static int handle_ep(struct at91_ep *ep)
1005{
1006 struct at91_request *req;
1007 u32 __iomem *creg = ep->creg;
1008 u32 csr = __raw_readl(creg);
1009
1010 if (!list_empty(&ep->queue))
1011 req = list_entry(ep->queue.next,
1012 struct at91_request, queue);
1013 else
1014 req = NULL;
1015
1016 if (ep->is_in) {
1017 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
1018 csr |= CLR_FX;
1019 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
1020 __raw_writel(csr, creg);
1021 }
1022 if (req)
1023 return write_fifo(ep, req);
1024
1025 } else {
1026 if (csr & AT91_UDP_STALLSENT) {
1027 /* STALLSENT bit == ISOERR */
1028 if (ep->is_iso && req)
1029 req->req.status = -EILSEQ;
1030 csr |= CLR_FX;
1031 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1032 __raw_writel(csr, creg);
1033 csr = __raw_readl(creg);
1034 }
1035 if (req && (csr & RX_DATA_READY))
1036 return read_fifo(ep, req);
1037 }
1038 return 0;
1039}
1040
1041union setup {
1042 u8 raw[8];
1043 struct usb_ctrlrequest r;
1044};
1045
1046static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1047{
1048 u32 __iomem *creg = ep->creg;
1049 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1050 unsigned rxcount, i = 0;
1051 u32 tmp;
1052 union setup pkt;
1053 int status = 0;
1054
1055 /* read and ack SETUP; hard-fail for bogus packets */
1056 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1057 if (likely(rxcount == 8)) {
1058 while (rxcount--)
1059 pkt.raw[i++] = __raw_readb(dreg);
1060 if (pkt.r.bRequestType & USB_DIR_IN) {
1061 csr |= AT91_UDP_DIR;
1062 ep->is_in = 1;
1063 } else {
1064 csr &= ~AT91_UDP_DIR;
1065 ep->is_in = 0;
1066 }
1067 } else {
1068 // REVISIT this happens sometimes under load; why??
1069 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1070 status = -EINVAL;
1071 }
1072 csr |= CLR_FX;
1073 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1074 __raw_writel(csr, creg);
1075 udc->wait_for_addr_ack = 0;
1076 udc->wait_for_config_ack = 0;
1077 ep->stopped = 0;
1078 if (unlikely(status != 0))
1079 goto stall;
1080
1081#define w_index le16_to_cpu(pkt.r.wIndex)
1082#define w_value le16_to_cpu(pkt.r.wValue)
1083#define w_length le16_to_cpu(pkt.r.wLength)
1084
1085 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1086 pkt.r.bRequestType, pkt.r.bRequest,
1087 w_value, w_index, w_length);
1088
1089 /*
1090 * A few standard requests get handled here, ones that touch
1091 * hardware ... notably for device and endpoint features.
1092 */
1093 udc->req_pending = 1;
1094 csr = __raw_readl(creg);
1095 csr |= CLR_FX;
1096 csr &= ~SET_FX;
1097 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1098
1099 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1100 | USB_REQ_SET_ADDRESS:
1101 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1102 udc->addr = w_value;
1103 udc->wait_for_addr_ack = 1;
1104 udc->req_pending = 0;
1105 /* FADDR is set later, when we ack host STATUS */
1106 return;
1107
1108 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1109 | USB_REQ_SET_CONFIGURATION:
1110 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1111 if (pkt.r.wValue)
1112 udc->wait_for_config_ack = (tmp == 0);
1113 else
1114 udc->wait_for_config_ack = (tmp != 0);
1115 if (udc->wait_for_config_ack)
1116 VDBG("wait for config\n");
1117 /* CONFG is toggled later, if gadget driver succeeds */
1118 break;
1119
1120 /*
1121 * Hosts may set or clear remote wakeup status, and
1122 * devices may report they're VBUS powered.
1123 */
1124 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1125 | USB_REQ_GET_STATUS:
1126 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1127 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1128 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1129 PACKET("get device status\n");
1130 __raw_writeb(tmp, dreg);
1131 __raw_writeb(0, dreg);
1132 goto write_in;
1133 /* then STATUS starts later, automatically */
1134 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1135 | USB_REQ_SET_FEATURE:
1136 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1137 goto stall;
1138 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1139 tmp |= AT91_UDP_ESR;
1140 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1141 goto succeed;
1142 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1143 | USB_REQ_CLEAR_FEATURE:
1144 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1145 goto stall;
1146 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1147 tmp &= ~AT91_UDP_ESR;
1148 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1149 goto succeed;
1150
1151 /*
1152 * Interfaces have no feature settings; this is pretty useless.
1153 * we won't even insist the interface exists...
1154 */
1155 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1156 | USB_REQ_GET_STATUS:
1157 PACKET("get interface status\n");
1158 __raw_writeb(0, dreg);
1159 __raw_writeb(0, dreg);
1160 goto write_in;
1161 /* then STATUS starts later, automatically */
1162 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1163 | USB_REQ_SET_FEATURE:
1164 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1165 | USB_REQ_CLEAR_FEATURE:
1166 goto stall;
1167
1168 /*
1169 * Hosts may clear bulk/intr endpoint halt after the gadget
1170 * driver sets it (not widely used); or set it (for testing)
1171 */
1172 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1173 | USB_REQ_GET_STATUS:
1174 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1175 ep = &udc->ep[tmp];
1176 if (tmp >= NUM_ENDPOINTS || (tmp && !ep->desc))
1177 goto stall;
1178
1179 if (tmp) {
1180 if ((w_index & USB_DIR_IN)) {
1181 if (!ep->is_in)
1182 goto stall;
1183 } else if (ep->is_in)
1184 goto stall;
1185 }
1186 PACKET("get %s status\n", ep->ep.name);
1187 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1188 tmp = (1 << USB_ENDPOINT_HALT);
1189 else
1190 tmp = 0;
1191 __raw_writeb(tmp, dreg);
1192 __raw_writeb(0, dreg);
1193 goto write_in;
1194 /* then STATUS starts later, automatically */
1195 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1196 | USB_REQ_SET_FEATURE:
1197 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1198 ep = &udc->ep[tmp];
1199 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1200 goto stall;
1201 if (!ep->desc || ep->is_iso)
1202 goto stall;
1203 if ((w_index & USB_DIR_IN)) {
1204 if (!ep->is_in)
1205 goto stall;
1206 } else if (ep->is_in)
1207 goto stall;
1208
1209 tmp = __raw_readl(ep->creg);
1210 tmp &= ~SET_FX;
1211 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1212 __raw_writel(tmp, ep->creg);
1213 goto succeed;
1214 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1215 | USB_REQ_CLEAR_FEATURE:
1216 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1217 ep = &udc->ep[tmp];
1218 if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1219 goto stall;
1220 if (tmp == 0)
1221 goto succeed;
1222 if (!ep->desc || ep->is_iso)
1223 goto stall;
1224 if ((w_index & USB_DIR_IN)) {
1225 if (!ep->is_in)
1226 goto stall;
1227 } else if (ep->is_in)
1228 goto stall;
1229
1230 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1231 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1232 tmp = __raw_readl(ep->creg);
1233 tmp |= CLR_FX;
1234 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1235 __raw_writel(tmp, ep->creg);
1236 if (!list_empty(&ep->queue))
1237 handle_ep(ep);
1238 goto succeed;
1239 }
1240
1241#undef w_value
1242#undef w_index
1243#undef w_length
1244
1245 /* pass request up to the gadget driver */
1246 if (udc->driver) {
1247 spin_unlock(&udc->lock);
1248 status = udc->driver->setup(&udc->gadget, &pkt.r);
1249 spin_lock(&udc->lock);
1250 }
1251 else
1252 status = -ENODEV;
1253 if (status < 0) {
1254stall:
1255 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1256 pkt.r.bRequestType, pkt.r.bRequest, status);
1257 csr |= AT91_UDP_FORCESTALL;
1258 __raw_writel(csr, creg);
1259 udc->req_pending = 0;
1260 }
1261 return;
1262
1263succeed:
1264 /* immediate successful (IN) STATUS after zero length DATA */
1265 PACKET("ep0 in/status\n");
1266write_in:
1267 csr |= AT91_UDP_TXPKTRDY;
1268 __raw_writel(csr, creg);
1269 udc->req_pending = 0;
1270}
1271
1272static void handle_ep0(struct at91_udc *udc)
1273{
1274 struct at91_ep *ep0 = &udc->ep[0];
1275 u32 __iomem *creg = ep0->creg;
1276 u32 csr = __raw_readl(creg);
1277 struct at91_request *req;
1278
1279 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1280 nuke(ep0, -EPROTO);
1281 udc->req_pending = 0;
1282 csr |= CLR_FX;
1283 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1284 __raw_writel(csr, creg);
1285 VDBG("ep0 stalled\n");
1286 csr = __raw_readl(creg);
1287 }
1288 if (csr & AT91_UDP_RXSETUP) {
1289 nuke(ep0, 0);
1290 udc->req_pending = 0;
1291 handle_setup(udc, ep0, csr);
1292 return;
1293 }
1294
1295 if (list_empty(&ep0->queue))
1296 req = NULL;
1297 else
1298 req = list_entry(ep0->queue.next, struct at91_request, queue);
1299
1300 /* host ACKed an IN packet that we sent */
1301 if (csr & AT91_UDP_TXCOMP) {
1302 csr |= CLR_FX;
1303 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1304
1305 /* write more IN DATA? */
1306 if (req && ep0->is_in) {
1307 if (handle_ep(ep0))
1308 udc->req_pending = 0;
1309
1310 /*
1311 * Ack after:
1312 * - last IN DATA packet (including GET_STATUS)
1313 * - IN/STATUS for OUT DATA
1314 * - IN/STATUS for any zero-length DATA stage
1315 * except for the IN DATA case, the host should send
1316 * an OUT status later, which we'll ack.
1317 */
1318 } else {
1319 udc->req_pending = 0;
1320 __raw_writel(csr, creg);
1321
1322 /*
1323 * SET_ADDRESS takes effect only after the STATUS
1324 * (to the original address) gets acked.
1325 */
1326 if (udc->wait_for_addr_ack) {
1327 u32 tmp;
1328
1329 at91_udp_write(udc, AT91_UDP_FADDR,
1330 AT91_UDP_FEN | udc->addr);
1331 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1332 tmp &= ~AT91_UDP_FADDEN;
1333 if (udc->addr)
1334 tmp |= AT91_UDP_FADDEN;
1335 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1336
1337 udc->wait_for_addr_ack = 0;
1338 VDBG("address %d\n", udc->addr);
1339 }
1340 }
1341 }
1342
1343 /* OUT packet arrived ... */
1344 else if (csr & AT91_UDP_RX_DATA_BK0) {
1345 csr |= CLR_FX;
1346 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1347
1348 /* OUT DATA stage */
1349 if (!ep0->is_in) {
1350 if (req) {
1351 if (handle_ep(ep0)) {
1352 /* send IN/STATUS */
1353 PACKET("ep0 in/status\n");
1354 csr = __raw_readl(creg);
1355 csr &= ~SET_FX;
1356 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1357 __raw_writel(csr, creg);
1358 udc->req_pending = 0;
1359 }
1360 } else if (udc->req_pending) {
1361 /*
1362 * AT91 hardware has a hard time with this
1363 * "deferred response" mode for control-OUT
1364 * transfers. (For control-IN it's fine.)
1365 *
1366 * The normal solution leaves OUT data in the
1367 * fifo until the gadget driver is ready.
1368 * We couldn't do that here without disabling
1369 * the IRQ that tells about SETUP packets,
1370 * e.g. when the host gets impatient...
1371 *
1372 * Working around it by copying into a buffer
1373 * would almost be a non-deferred response,
1374 * except that it wouldn't permit reliable
1375 * stalling of the request. Instead, demand
1376 * that gadget drivers not use this mode.
1377 */
1378 DBG("no control-OUT deferred responses!\n");
1379 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1380 udc->req_pending = 0;
1381 }
1382
1383 /* STATUS stage for control-IN; ack. */
1384 } else {
1385 PACKET("ep0 out/status ACK\n");
1386 __raw_writel(csr, creg);
1387
1388 /* "early" status stage */
1389 if (req)
1390 done(ep0, req, 0);
1391 }
1392 }
1393}
1394
1395static irqreturn_t at91_udc_irq (int irq, void *_udc)
1396{
1397 struct at91_udc *udc = _udc;
1398 u32 rescans = 5;
1399 int disable_clock = 0;
1400 unsigned long flags;
1401
1402 spin_lock_irqsave(&udc->lock, flags);
1403
1404 if (!udc->clocked) {
1405 clk_on(udc);
1406 disable_clock = 1;
1407 }
1408
1409 while (rescans--) {
1410 u32 status;
1411
1412 status = at91_udp_read(udc, AT91_UDP_ISR)
1413 & at91_udp_read(udc, AT91_UDP_IMR);
1414 if (!status)
1415 break;
1416
1417 /* USB reset irq: not maskable */
1418 if (status & AT91_UDP_ENDBUSRES) {
1419 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1420 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1421 /* Atmel code clears this irq twice */
1422 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1423 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1424 VDBG("end bus reset\n");
1425 udc->addr = 0;
1426 stop_activity(udc);
1427
1428 /* enable ep0 */
1429 at91_udp_write(udc, AT91_UDP_CSR(0),
1430 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1431 udc->gadget.speed = USB_SPEED_FULL;
1432 udc->suspended = 0;
1433 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1434
1435 /*
1436 * NOTE: this driver keeps clocks off unless the
1437 * USB host is present. That saves power, but for
1438 * boards that don't support VBUS detection, both
1439 * clocks need to be active most of the time.
1440 */
1441
1442 /* host initiated suspend (3+ms bus idle) */
1443 } else if (status & AT91_UDP_RXSUSP) {
1444 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1445 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1446 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1447 // VDBG("bus suspend\n");
1448 if (udc->suspended)
1449 continue;
1450 udc->suspended = 1;
1451
1452 /*
1453 * NOTE: when suspending a VBUS-powered device, the
1454 * gadget driver should switch into slow clock mode
1455 * and then into standby to avoid drawing more than
1456 * 500uA power (2500uA for some high-power configs).
1457 */
1458 if (udc->driver && udc->driver->suspend) {
1459 spin_unlock(&udc->lock);
1460 udc->driver->suspend(&udc->gadget);
1461 spin_lock(&udc->lock);
1462 }
1463
1464 /* host initiated resume */
1465 } else if (status & AT91_UDP_RXRSM) {
1466 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1467 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1468 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1469 // VDBG("bus resume\n");
1470 if (!udc->suspended)
1471 continue;
1472 udc->suspended = 0;
1473
1474 /*
1475 * NOTE: for a VBUS-powered device, the gadget driver
1476 * would normally want to switch out of slow clock
1477 * mode into normal mode.
1478 */
1479 if (udc->driver && udc->driver->resume) {
1480 spin_unlock(&udc->lock);
1481 udc->driver->resume(&udc->gadget);
1482 spin_lock(&udc->lock);
1483 }
1484
1485 /* endpoint IRQs are cleared by handling them */
1486 } else {
1487 int i;
1488 unsigned mask = 1;
1489 struct at91_ep *ep = &udc->ep[1];
1490
1491 if (status & mask)
1492 handle_ep0(udc);
1493 for (i = 1; i < NUM_ENDPOINTS; i++) {
1494 mask <<= 1;
1495 if (status & mask)
1496 handle_ep(ep);
1497 ep++;
1498 }
1499 }
1500 }
1501
1502 if (disable_clock)
1503 clk_off(udc);
1504
1505 spin_unlock_irqrestore(&udc->lock, flags);
1506
1507 return IRQ_HANDLED;
1508}
1509
1510/*-------------------------------------------------------------------------*/
1511
1512static void nop_release(struct device *dev)
1513{
1514 /* nothing to free */
1515}
1516
1517static struct at91_udc controller = {
1518 .gadget = {
1519 .ops = &at91_udc_ops,
1520 .ep0 = &controller.ep[0].ep,
1521 .name = driver_name,
1522 .dev = {
1523 .init_name = "gadget",
1524 .release = nop_release,
1525 }
1526 },
1527 .ep[0] = {
1528 .ep = {
1529 .name = ep0name,
1530 .ops = &at91_ep_ops,
1531 },
1532 .udc = &controller,
1533 .maxpacket = 8,
1534 .int_mask = 1 << 0,
1535 },
1536 .ep[1] = {
1537 .ep = {
1538 .name = "ep1",
1539 .ops = &at91_ep_ops,
1540 },
1541 .udc = &controller,
1542 .is_pingpong = 1,
1543 .maxpacket = 64,
1544 .int_mask = 1 << 1,
1545 },
1546 .ep[2] = {
1547 .ep = {
1548 .name = "ep2",
1549 .ops = &at91_ep_ops,
1550 },
1551 .udc = &controller,
1552 .is_pingpong = 1,
1553 .maxpacket = 64,
1554 .int_mask = 1 << 2,
1555 },
1556 .ep[3] = {
1557 .ep = {
1558 /* could actually do bulk too */
1559 .name = "ep3-int",
1560 .ops = &at91_ep_ops,
1561 },
1562 .udc = &controller,
1563 .maxpacket = 8,
1564 .int_mask = 1 << 3,
1565 },
1566 .ep[4] = {
1567 .ep = {
1568 .name = "ep4",
1569 .ops = &at91_ep_ops,
1570 },
1571 .udc = &controller,
1572 .is_pingpong = 1,
1573 .maxpacket = 256,
1574 .int_mask = 1 << 4,
1575 },
1576 .ep[5] = {
1577 .ep = {
1578 .name = "ep5",
1579 .ops = &at91_ep_ops,
1580 },
1581 .udc = &controller,
1582 .is_pingpong = 1,
1583 .maxpacket = 256,
1584 .int_mask = 1 << 5,
1585 },
1586 /* ep6 and ep7 are also reserved (custom silicon might use them) */
1587};
1588
1589static void at91_vbus_update(struct at91_udc *udc, unsigned value)
1590{
1591 value ^= udc->board.vbus_active_low;
1592 if (value != udc->vbus)
1593 at91_vbus_session(&udc->gadget, value);
1594}
1595
1596static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1597{
1598 struct at91_udc *udc = _udc;
1599
1600 /* vbus needs at least brief debouncing */
1601 udelay(10);
1602 at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
1603
1604 return IRQ_HANDLED;
1605}
1606
1607static void at91_vbus_timer_work(struct work_struct *work)
1608{
1609 struct at91_udc *udc = container_of(work, struct at91_udc,
1610 vbus_timer_work);
1611
1612 at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
1613
1614 if (!timer_pending(&udc->vbus_timer))
1615 mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
1616}
1617
1618static void at91_vbus_timer(unsigned long data)
1619{
1620 struct at91_udc *udc = (struct at91_udc *)data;
1621
1622 /*
1623 * If we are polling vbus it is likely that the gpio is on an
1624 * bus such as i2c or spi which may sleep, so schedule some work
1625 * to read the vbus gpio
1626 */
1627 if (!work_pending(&udc->vbus_timer_work))
1628 schedule_work(&udc->vbus_timer_work);
1629}
1630
1631int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
1632 int (*bind)(struct usb_gadget *))
1633{
1634 struct at91_udc *udc = &controller;
1635 int retval;
1636 unsigned long flags;
1637
1638 if (!driver
1639 || driver->speed < USB_SPEED_FULL
1640 || !bind
1641 || !driver->setup) {
1642 DBG("bad parameter.\n");
1643 return -EINVAL;
1644 }
1645
1646 if (udc->driver) {
1647 DBG("UDC already has a gadget driver\n");
1648 return -EBUSY;
1649 }
1650
1651 udc->driver = driver;
1652 udc->gadget.dev.driver = &driver->driver;
1653 dev_set_drvdata(&udc->gadget.dev, &driver->driver);
1654 udc->enabled = 1;
1655 udc->selfpowered = 1;
1656
1657 retval = bind(&udc->gadget);
1658 if (retval) {
1659 DBG("bind() returned %d\n", retval);
1660 udc->driver = NULL;
1661 udc->gadget.dev.driver = NULL;
1662 dev_set_drvdata(&udc->gadget.dev, NULL);
1663 udc->enabled = 0;
1664 udc->selfpowered = 0;
1665 return retval;
1666 }
1667
1668 spin_lock_irqsave(&udc->lock, flags);
1669 pullup(udc, 1);
1670 spin_unlock_irqrestore(&udc->lock, flags);
1671
1672 DBG("bound to %s\n", driver->driver.name);
1673 return 0;
1674}
1675EXPORT_SYMBOL(usb_gadget_probe_driver);
1676
1677int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
1678{
1679 struct at91_udc *udc = &controller;
1680 unsigned long flags;
1681
1682 if (!driver || driver != udc->driver || !driver->unbind)
1683 return -EINVAL;
1684
1685 spin_lock_irqsave(&udc->lock, flags);
1686 udc->enabled = 0;
1687 at91_udp_write(udc, AT91_UDP_IDR, ~0);
1688 pullup(udc, 0);
1689 spin_unlock_irqrestore(&udc->lock, flags);
1690
1691 driver->unbind(&udc->gadget);
1692 udc->gadget.dev.driver = NULL;
1693 dev_set_drvdata(&udc->gadget.dev, NULL);
1694 udc->driver = NULL;
1695
1696 DBG("unbound from %s\n", driver->driver.name);
1697 return 0;
1698}
1699EXPORT_SYMBOL (usb_gadget_unregister_driver);
1700
1701/*-------------------------------------------------------------------------*/
1702
1703static void at91udc_shutdown(struct platform_device *dev)
1704{
1705 struct at91_udc *udc = platform_get_drvdata(dev);
1706 unsigned long flags;
1707
1708 /* force disconnect on reboot */
1709 spin_lock_irqsave(&udc->lock, flags);
1710 pullup(platform_get_drvdata(dev), 0);
1711 spin_unlock_irqrestore(&udc->lock, flags);
1712}
1713
1714static int __init at91udc_probe(struct platform_device *pdev)
1715{
1716 struct device *dev = &pdev->dev;
1717 struct at91_udc *udc;
1718 int retval;
1719 struct resource *res;
1720
1721 if (!dev->platform_data) {
1722 /* small (so we copy it) but critical! */
1723 DBG("missing platform_data\n");
1724 return -ENODEV;
1725 }
1726
1727 if (pdev->num_resources != 2) {
1728 DBG("invalid num_resources\n");
1729 return -ENODEV;
1730 }
1731 if ((pdev->resource[0].flags != IORESOURCE_MEM)
1732 || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1733 DBG("invalid resource type\n");
1734 return -ENODEV;
1735 }
1736
1737 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1738 if (!res)
1739 return -ENXIO;
1740
1741 if (!request_mem_region(res->start, resource_size(res), driver_name)) {
1742 DBG("someone's using UDC memory\n");
1743 return -EBUSY;
1744 }
1745
1746 /* init software state */
1747 udc = &controller;
1748 udc->gadget.dev.parent = dev;
1749 udc->board = *(struct at91_udc_data *) dev->platform_data;
1750 udc->pdev = pdev;
1751 udc->enabled = 0;
1752 spin_lock_init(&udc->lock);
1753
1754 /* rm9200 needs manual D+ pullup; off by default */
1755 if (cpu_is_at91rm9200()) {
1756 if (udc->board.pullup_pin <= 0) {
1757 DBG("no D+ pullup?\n");
1758 retval = -ENODEV;
1759 goto fail0;
1760 }
1761 retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
1762 if (retval) {
1763 DBG("D+ pullup is busy\n");
1764 goto fail0;
1765 }
1766 gpio_direction_output(udc->board.pullup_pin,
1767 udc->board.pullup_active_low);
1768 }
1769
1770 /* newer chips have more FIFO memory than rm9200 */
1771 if (cpu_is_at91sam9260() || cpu_is_at91sam9g20()) {
1772 udc->ep[0].maxpacket = 64;
1773 udc->ep[3].maxpacket = 64;
1774 udc->ep[4].maxpacket = 512;
1775 udc->ep[5].maxpacket = 512;
1776 } else if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()) {
1777 udc->ep[3].maxpacket = 64;
1778 } else if (cpu_is_at91sam9263()) {
1779 udc->ep[0].maxpacket = 64;
1780 udc->ep[3].maxpacket = 64;
1781 }
1782
1783 udc->udp_baseaddr = ioremap(res->start, resource_size(res));
1784 if (!udc->udp_baseaddr) {
1785 retval = -ENOMEM;
1786 goto fail0a;
1787 }
1788
1789 udc_reinit(udc);
1790
1791 /* get interface and function clocks */
1792 udc->iclk = clk_get(dev, "udc_clk");
1793 udc->fclk = clk_get(dev, "udpck");
1794 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
1795 DBG("clocks missing\n");
1796 retval = -ENODEV;
1797 /* NOTE: we "know" here that refcounts on these are NOPs */
1798 goto fail0b;
1799 }
1800
1801 retval = device_register(&udc->gadget.dev);
1802 if (retval < 0) {
1803 put_device(&udc->gadget.dev);
1804 goto fail0b;
1805 }
1806
1807 /* don't do anything until we have both gadget driver and VBUS */
1808 clk_enable(udc->iclk);
1809 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1810 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
1811 /* Clear all pending interrupts - UDP may be used by bootloader. */
1812 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1813 clk_disable(udc->iclk);
1814
1815 /* request UDC and maybe VBUS irqs */
1816 udc->udp_irq = platform_get_irq(pdev, 0);
1817 retval = request_irq(udc->udp_irq, at91_udc_irq,
1818 IRQF_DISABLED, driver_name, udc);
1819 if (retval < 0) {
1820 DBG("request irq %d failed\n", udc->udp_irq);
1821 goto fail1;
1822 }
1823 if (udc->board.vbus_pin > 0) {
1824 retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
1825 if (retval < 0) {
1826 DBG("request vbus pin failed\n");
1827 goto fail2;
1828 }
1829 gpio_direction_input(udc->board.vbus_pin);
1830
1831 /*
1832 * Get the initial state of VBUS - we cannot expect
1833 * a pending interrupt.
1834 */
1835 udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
1836 udc->board.vbus_active_low;
1837
1838 if (udc->board.vbus_polled) {
1839 INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
1840 setup_timer(&udc->vbus_timer, at91_vbus_timer,
1841 (unsigned long)udc);
1842 mod_timer(&udc->vbus_timer,
1843 jiffies + VBUS_POLL_TIMEOUT);
1844 } else {
1845 if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
1846 IRQF_DISABLED, driver_name, udc)) {
1847 DBG("request vbus irq %d failed\n",
1848 udc->board.vbus_pin);
1849 retval = -EBUSY;
1850 goto fail3;
1851 }
1852 }
1853 } else {
1854 DBG("no VBUS detection, assuming always-on\n");
1855 udc->vbus = 1;
1856 }
1857 dev_set_drvdata(dev, udc);
1858 device_init_wakeup(dev, 1);
1859 create_debug_file(udc);
1860
1861 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1862 return 0;
1863
1864fail3:
1865 if (udc->board.vbus_pin > 0)
1866 gpio_free(udc->board.vbus_pin);
1867fail2:
1868 free_irq(udc->udp_irq, udc);
1869fail1:
1870 device_unregister(&udc->gadget.dev);
1871fail0b:
1872 iounmap(udc->udp_baseaddr);
1873fail0a:
1874 if (cpu_is_at91rm9200())
1875 gpio_free(udc->board.pullup_pin);
1876fail0:
1877 release_mem_region(res->start, resource_size(res));
1878 DBG("%s probe failed, %d\n", driver_name, retval);
1879 return retval;
1880}
1881
1882static int __exit at91udc_remove(struct platform_device *pdev)
1883{
1884 struct at91_udc *udc = platform_get_drvdata(pdev);
1885 struct resource *res;
1886 unsigned long flags;
1887
1888 DBG("remove\n");
1889
1890 if (udc->driver)
1891 return -EBUSY;
1892
1893 spin_lock_irqsave(&udc->lock, flags);
1894 pullup(udc, 0);
1895 spin_unlock_irqrestore(&udc->lock, flags);
1896
1897 device_init_wakeup(&pdev->dev, 0);
1898 remove_debug_file(udc);
1899 if (udc->board.vbus_pin > 0) {
1900 free_irq(udc->board.vbus_pin, udc);
1901 gpio_free(udc->board.vbus_pin);
1902 }
1903 free_irq(udc->udp_irq, udc);
1904 device_unregister(&udc->gadget.dev);
1905
1906 iounmap(udc->udp_baseaddr);
1907
1908 if (cpu_is_at91rm9200())
1909 gpio_free(udc->board.pullup_pin);
1910
1911 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1912 release_mem_region(res->start, resource_size(res));
1913
1914 clk_put(udc->iclk);
1915 clk_put(udc->fclk);
1916
1917 return 0;
1918}
1919
1920#ifdef CONFIG_PM
1921static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1922{
1923 struct at91_udc *udc = platform_get_drvdata(pdev);
1924 int wake = udc->driver && device_may_wakeup(&pdev->dev);
1925 unsigned long flags;
1926
1927 /* Unless we can act normally to the host (letting it wake us up
1928 * whenever it has work for us) force disconnect. Wakeup requires
1929 * PLLB for USB events (signaling for reset, wakeup, or incoming
1930 * tokens) and VBUS irqs (on systems which support them).
1931 */
1932 if ((!udc->suspended && udc->addr)
1933 || !wake
1934 || at91_suspend_entering_slow_clock()) {
1935 spin_lock_irqsave(&udc->lock, flags);
1936 pullup(udc, 0);
1937 wake = 0;
1938 spin_unlock_irqrestore(&udc->lock, flags);
1939 } else
1940 enable_irq_wake(udc->udp_irq);
1941
1942 ud…Large files files are truncated, but you can click here to view the full file