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USB: Fix EHCI warning
[deliverable/linux.git] / drivers / usb / gadget / at91_udc.c
CommitLineData
bae4bd84
DB		 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 DEBUG
25#undef VERBOSE
26#undef PACKET_TRACE
27
bae4bd84
DB		 28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/platform_device.h>
31#include <linux/delay.h>
32#include <linux/ioport.h>
33#include <linux/sched.h>
34#include <linux/slab.h>
35#include <linux/smp_lock.h>
36#include <linux/errno.h>
37#include <linux/init.h>
38#include <linux/list.h>
39#include <linux/interrupt.h>
40#include <linux/proc_fs.h>
41#include <linux/clk.h>
42#include <linux/usb_ch9.h>
43#include <linux/usb_gadget.h>
44
45#include <asm/byteorder.h>
ffd3326b 46#include <asm/hardware.h>
bae4bd84
DB		 47#include <asm/io.h>
48#include <asm/irq.h>
49#include <asm/system.h>
50#include <asm/mach-types.h>
51
bae4bd84
DB		 52#include <asm/arch/gpio.h>
53#include <asm/arch/board.h>
29ba4b53
AV		 54#include <asm/arch/cpu.h>
55#include <asm/arch/at91sam9261_matrix.h>
bae4bd84
DB		 56
57#include "at91_udc.h"
58
59
60/*
61 * This controller is simple and PIO-only. It's used in many AT91-series
8b2e7668
DB		 62 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
63 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
bae4bd84
DB		 64 *
65 * This driver expects the board has been wired with two GPIOs suppporting
66 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
8b2e7668
DB		 67 * testing hasn't covered such cases.)
68 *
69 * The pullup is most important (so it's integrated on sam926x parts). It
bae4bd84 70 * provides software control over whether the host enumerates the device.
8b2e7668 71 *
bae4bd84
DB		 72 * The VBUS sensing helps during enumeration, and allows both USB clocks
73 * (and the transceiver) to stay gated off until they're necessary, saving
8b2e7668
DB		 74 * power. During USB suspend, the 48 MHz clock is gated off in hardware;
75 * it may also be gated off by software during some Linux sleep states.
bae4bd84
DB		 76 */
77
8b2e7668 78#define DRIVER_VERSION "3 May 2006"
bae4bd84
DB		 79
80static const char driver_name [] = "at91_udc";
81static const char ep0name[] = "ep0";
82
bae4bd84 83
ffd3326b
AV		 84#define at91_udp_read(dev, reg) \
85 __raw_readl((dev)->udp_baseaddr + (reg))
86#define at91_udp_write(dev, reg, val) \
87 __raw_writel((val), (dev)->udp_baseaddr + (reg))
bae4bd84
DB		 88
89/*-------------------------------------------------------------------------*/
90
91#ifdef CONFIG_USB_GADGET_DEBUG_FILES
92
93#include <linux/seq_file.h>
94
95static const char debug_filename[] = "driver/udc";
96
97#define FOURBITS "%s%s%s%s"
98#define EIGHTBITS FOURBITS FOURBITS
99
100static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
101{
102 static char *types[] = {
103 "control", "out-iso", "out-bulk", "out-int",
104 "BOGUS", "in-iso", "in-bulk", "in-int"};
105
106 u32 csr;
107 struct at91_request *req;
108 unsigned long flags;
109
110 local_irq_save(flags);
111
112 csr = __raw_readl(ep->creg);
113
114 /* NOTE: not collecting per-endpoint irq statistics... */
115
116 seq_printf(s, "\n");
117 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
118 ep->ep.name, ep->ep.maxpacket,
119 ep->is_in ? "in" : "out",
120 ep->is_iso ? " iso" : "",
121 ep->is_pingpong
122 ? (ep->fifo_bank ? "pong" : "ping")
123 : "",
124 ep->stopped ? " stopped" : "");
125 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
126 csr,
127 (csr & 0x07ff0000) >> 16,
128 (csr & (1 << 15)) ? "enabled" : "disabled",
129 (csr & (1 << 11)) ? "DATA1" : "DATA0",
130 types[(csr & 0x700) >> 8],
131
132 /* iff type is control then print current direction */
133 (!(csr & 0x700))
134 ? ((csr & (1 << 7)) ? " IN" : " OUT")
135 : "",
136 (csr & (1 << 6)) ? " rxdatabk1" : "",
137 (csr & (1 << 5)) ? " forcestall" : "",
138 (csr & (1 << 4)) ? " txpktrdy" : "",
139
140 (csr & (1 << 3)) ? " stallsent" : "",
141 (csr & (1 << 2)) ? " rxsetup" : "",
142 (csr & (1 << 1)) ? " rxdatabk0" : "",
143 (csr & (1 << 0)) ? " txcomp" : "");
144 if (list_empty (&ep->queue))
145 seq_printf(s, "\t(queue empty)\n");
146
147 else list_for_each_entry (req, &ep->queue, queue) {
148 unsigned length = req->req.actual;
149
150 seq_printf(s, "\treq %p len %d/%d buf %p\n",
151 &req->req, length,
152 req->req.length, req->req.buf);
153 }
154 local_irq_restore(flags);
155}
156
157static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
158{
159 int i;
160
161 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
162 (mask & (1 << 13)) ? " wakeup" : "",
163 (mask & (1 << 12)) ? " endbusres" : "",
164
165 (mask & (1 << 11)) ? " sofint" : "",
166 (mask & (1 << 10)) ? " extrsm" : "",
167 (mask & (1 << 9)) ? " rxrsm" : "",
168 (mask & (1 << 8)) ? " rxsusp" : "");
169 for (i = 0; i < 8; i++) {
170 if (mask & (1 << i))
171 seq_printf(s, " ep%d", i);
172 }
173 seq_printf(s, "\n");
174}
175
176static int proc_udc_show(struct seq_file *s, void *unused)
177{
178 struct at91_udc *udc = s->private;
179 struct at91_ep *ep;
180 u32 tmp;
181
182 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
183
184 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
185 udc->vbus ? "present" : "off",
186 udc->enabled
187 ? (udc->vbus ? "active" : "enabled")
188 : "disabled",
189 udc->selfpowered ? "self" : "VBUS",
190 udc->suspended ? ", suspended" : "",
191 udc->driver ? udc->driver->driver.name : "(none)");
192
193 /* don't access registers when interface isn't clocked */
194 if (!udc->clocked) {
195 seq_printf(s, "(not clocked)\n");
196 return 0;
197 }
198
ffd3326b 199 tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
bae4bd84
DB		 200 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
201 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
202 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
203 (tmp & AT91_UDP_NUM));
204
ffd3326b 205 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
bae4bd84
DB		 206 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
207 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
208 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
209 (tmp & AT91_UDP_ESR) ? " esr" : "",
210 (tmp & AT91_UDP_CONFG) ? " confg" : "",
211 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
212
ffd3326b 213 tmp = at91_udp_read(udc, AT91_UDP_FADDR);
bae4bd84
DB		 214 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
215 (tmp & AT91_UDP_FEN) ? " fen" : "",
216 (tmp & AT91_UDP_FADD));
217
ffd3326b
AV		 218 proc_irq_show(s, "imr ", at91_udp_read(udc, AT91_UDP_IMR));
219 proc_irq_show(s, "isr ", at91_udp_read(udc, AT91_UDP_ISR));
bae4bd84
DB		 220
221 if (udc->enabled && udc->vbus) {
222 proc_ep_show(s, &udc->ep[0]);
223 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
224 if (ep->desc)
225 proc_ep_show(s, ep);
226 }
227 }
228 return 0;
229}
230
231static int proc_udc_open(struct inode *inode, struct file *file)
232{
233 return single_open(file, proc_udc_show, PDE(inode)->data);
234}
235
066202dd 236static const struct file_operations proc_ops = {
bae4bd84
DB		 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 struct proc_dir_entry *pde;
246
247 pde = create_proc_entry (debug_filename, 0, NULL);
248 udc->pde = pde;
249 if (pde == NULL)
250 return;
251
252 pde->proc_fops = &proc_ops;
253 pde->data = udc;
254}
255
256static void remove_debug_file(struct at91_udc *udc)
257{
258 if (udc->pde)
259 remove_proc_entry(debug_filename, NULL);
260}
261
262#else
263
264static inline void create_debug_file(struct at91_udc *udc) {}
265static inline void remove_debug_file(struct at91_udc *udc) {}
266
267#endif
268
269
270/*-------------------------------------------------------------------------*/
271
272static void done(struct at91_ep *ep, struct at91_request *req, int status)
273{
274 unsigned stopped = ep->stopped;
ffd3326b 275 struct at91_udc *udc = ep->udc;
bae4bd84
DB		 276
277 list_del_init(&req->queue);
278 if (req->req.status == -EINPROGRESS)
279 req->req.status = status;
280 else
281 status = req->req.status;
282 if (status && status != -ESHUTDOWN)
283 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
284
285 ep->stopped = 1;
286 req->req.complete(&ep->ep, &req->req);
287 ep->stopped = stopped;
288
289 /* ep0 is always ready; other endpoints need a non-empty queue */
290 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
ffd3326b 291 at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
bae4bd84
DB		 292}
293
294/*-------------------------------------------------------------------------*/
295
296/* bits indicating OUT fifo has data ready */
297#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
298
299/*
300 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
301 * back most of the value you just read (because of side effects, including
302 * bits that may change after reading and before writing).
303 *
304 * Except when changing a specific bit, always write values which:
305 * - clear SET_FX bits (setting them could change something)
306 * - set CLR_FX bits (clearing them could change something)
307 *
308 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
309 * that shouldn't normally be changed.
8b2e7668
DB		 310 *
311 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
312 * implying a need to wait for one write to complete (test relevant bits)
313 * before starting the next write. This shouldn't be an issue given how
314 * infrequently we write, except maybe for write-then-read idioms.
bae4bd84
DB		 315 */
316#define SET_FX (AT91_UDP_TXPKTRDY)
8b2e7668
DB		 317#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP \
318 | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
bae4bd84
DB		 319
320/* pull OUT packet data from the endpoint's fifo */
321static int read_fifo (struct at91_ep *ep, struct at91_request *req)
322{
323 u32 __iomem *creg = ep->creg;
324 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
325 u32 csr;
326 u8 *buf;
327 unsigned int count, bufferspace, is_done;
328
329 buf = req->req.buf + req->req.actual;
330 bufferspace = req->req.length - req->req.actual;
331
332 /*
333 * there might be nothing to read if ep_queue() calls us,
334 * or if we already emptied both pingpong buffers
335 */
336rescan:
337 csr = __raw_readl(creg);
338 if ((csr & RX_DATA_READY) == 0)
339 return 0;
340
341 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
342 if (count > ep->ep.maxpacket)
343 count = ep->ep.maxpacket;
344 if (count > bufferspace) {
345 DBG("%s buffer overflow\n", ep->ep.name);
346 req->req.status = -EOVERFLOW;
347 count = bufferspace;
348 }
349 __raw_readsb(dreg, buf, count);
350
351 /* release and swap pingpong mem bank */
352 csr |= CLR_FX;
353 if (ep->is_pingpong) {
354 if (ep->fifo_bank == 0) {
355 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
356 ep->fifo_bank = 1;
357 } else {
358 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
359 ep->fifo_bank = 0;
360 }
361 } else
362 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
363 __raw_writel(csr, creg);
364
365 req->req.actual += count;
366 is_done = (count < ep->ep.maxpacket);
367 if (count == bufferspace)
368 is_done = 1;
369
370 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
371 is_done ? " (done)" : "");
372
373 /*
374 * avoid extra trips through IRQ logic for packets already in
375 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
376 */
377 if (is_done)
378 done(ep, req, 0);
379 else if (ep->is_pingpong) {
380 bufferspace -= count;
381 buf += count;
382 goto rescan;
383 }
384
385 return is_done;
386}
387
388/* load fifo for an IN packet */
389static int write_fifo(struct at91_ep *ep, struct at91_request *req)
390{
391 u32 __iomem *creg = ep->creg;
392 u32 csr = __raw_readl(creg);
393 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
394 unsigned total, count, is_last;
395
396 /*
397 * TODO: allow for writing two packets to the fifo ... that'll
398 * reduce the amount of IN-NAKing, but probably won't affect
399 * throughput much. (Unlike preventing OUT-NAKing!)
400 */
401
402 /*
403 * If ep_queue() calls us, the queue is empty and possibly in
404 * odd states like TXCOMP not yet cleared (we do it, saving at
405 * least one IRQ) or the fifo not yet being free. Those aren't
406 * issues normally (IRQ handler fast path).
407 */
408 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
409 if (csr & AT91_UDP_TXCOMP) {
410 csr |= CLR_FX;
411 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
412 __raw_writel(csr, creg);
413 csr = __raw_readl(creg);
414 }
415 if (csr & AT91_UDP_TXPKTRDY)
416 return 0;
417 }
418
419 total = req->req.length - req->req.actual;
420 if (ep->ep.maxpacket < total) {
421 count = ep->ep.maxpacket;
422 is_last = 0;
423 } else {
424 count = total;
425 is_last = (count < ep->ep.maxpacket) || !req->req.zero;
426 }
427
428 /*
429 * Write the packet, maybe it's a ZLP.
430 *
431 * NOTE: incrementing req->actual before we receive the ACK means
432 * gadget driver IN bytecounts can be wrong in fault cases. That's
433 * fixable with PIO drivers like this one (save "count" here, and
434 * do the increment later on TX irq), but not for most DMA hardware.
435 *
436 * So all gadget drivers must accept that potential error. Some
437 * hardware supports precise fifo status reporting, letting them
438 * recover when the actual bytecount matters (e.g. for USB Test
439 * and Measurement Class devices).
440 */
441 __raw_writesb(dreg, req->req.buf + req->req.actual, count);
442 csr &= ~SET_FX;
443 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
444 __raw_writel(csr, creg);
445 req->req.actual += count;
446
447 PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
448 is_last ? " (done)" : "");
449 if (is_last)
450 done(ep, req, 0);
451 return is_last;
452}
453
454static void nuke(struct at91_ep *ep, int status)
455{
456 struct at91_request *req;
457
458 // terminer chaque requete dans la queue
459 ep->stopped = 1;
460 if (list_empty(&ep->queue))
461 return;
462
463 VDBG("%s %s\n", __FUNCTION__, ep->ep.name);
464 while (!list_empty(&ep->queue)) {
465 req = list_entry(ep->queue.next, struct at91_request, queue);
466 done(ep, req, status);
467 }
468}
469
470/*-------------------------------------------------------------------------*/
471
8b2e7668
DB		 472static int at91_ep_enable(struct usb_ep *_ep,
473 const struct usb_endpoint_descriptor *desc)
bae4bd84
DB		 474{
475 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
476 struct at91_udc *dev = ep->udc;
477 u16 maxpacket;
478 u32 tmp;
479 unsigned long flags;
480
481 if (!_ep || !ep
482 || !desc || ep->desc
483 || _ep->name == ep0name
484 || desc->bDescriptorType != USB_DT_ENDPOINT
485 || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0
486 || maxpacket > ep->maxpacket) {
487 DBG("bad ep or descriptor\n");
488 return -EINVAL;
489 }
490
491 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
492 DBG("bogus device state\n");
493 return -ESHUTDOWN;
494 }
495
496 tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
497 switch (tmp) {
498 case USB_ENDPOINT_XFER_CONTROL:
499 DBG("only one control endpoint\n");
500 return -EINVAL;
501 case USB_ENDPOINT_XFER_INT:
502 if (maxpacket > 64)
503 goto bogus_max;
504 break;
505 case USB_ENDPOINT_XFER_BULK:
506 switch (maxpacket) {
507 case 8:
508 case 16:
509 case 32:
510 case 64:
511 goto ok;
512 }
513bogus_max:
514 DBG("bogus maxpacket %d\n", maxpacket);
515 return -EINVAL;
516 case USB_ENDPOINT_XFER_ISOC:
517 if (!ep->is_pingpong) {
518 DBG("iso requires double buffering\n");
519 return -EINVAL;
520 }
521 break;
522 }
523
524ok:
525 local_irq_save(flags);
526
527 /* initialize endpoint to match this descriptor */
528 ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
529 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
530 ep->stopped = 0;
531 if (ep->is_in)
532 tmp |= 0x04;
533 tmp <<= 8;
534 tmp |= AT91_UDP_EPEDS;
535 __raw_writel(tmp, ep->creg);
536
537 ep->desc = desc;
538 ep->ep.maxpacket = maxpacket;
539
540 /*
541 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
542 * since endpoint resets don't reset hw pingpong state.
543 */
ffd3326b
AV		 544 at91_udp_write(dev, AT91_UDP_RST_EP, ep->int_mask);
545 at91_udp_write(dev, AT91_UDP_RST_EP, 0);
bae4bd84
DB		 546
547 local_irq_restore(flags);
548 return 0;
549}
550
551static int at91_ep_disable (struct usb_ep * _ep)
552{
553 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
ffd3326b 554 struct at91_udc *udc = ep->udc;
bae4bd84
DB		 555 unsigned long flags;
556
557 if (ep == &ep->udc->ep[0])
558 return -EINVAL;
559
560 local_irq_save(flags);
561
562 nuke(ep, -ESHUTDOWN);
563
564 /* restore the endpoint's pristine config */
565 ep->desc = NULL;
566 ep->ep.maxpacket = ep->maxpacket;
567
568 /* reset fifos and endpoint */
569 if (ep->udc->clocked) {
ffd3326b
AV		 570 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
571 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
bae4bd84
DB		 572 __raw_writel(0, ep->creg);
573 }
574
575 local_irq_restore(flags);
576 return 0;
577}
578
579/*
580 * this is a PIO-only driver, so there's nothing
581 * interesting for request or buffer allocation.
582 */
583
8b2e7668
DB		 584static struct usb_request *
585at91_ep_alloc_request(struct usb_ep *_ep, unsigned int gfp_flags)
bae4bd84
DB		 586{
587 struct at91_request *req;
588
cd861280 589 req = kzalloc(sizeof (struct at91_request), gfp_flags);
bae4bd84
DB		 590 if (!req)
591 return NULL;
592
593 INIT_LIST_HEAD(&req->queue);
594 return &req->req;
595}
596
597static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
598{
599 struct at91_request *req;
600
601 req = container_of(_req, struct at91_request, req);
602 BUG_ON(!list_empty(&req->queue));
603 kfree(req);
604}
605
606static void *at91_ep_alloc_buffer(
607 struct usb_ep *_ep,
608 unsigned bytes,
609 dma_addr_t *dma,
610 gfp_t gfp_flags)
611{
612 *dma = ~0;
613 return kmalloc(bytes, gfp_flags);
614}
615
616static void at91_ep_free_buffer(
617 struct usb_ep *ep,
618 void *buf,
619 dma_addr_t dma,
620 unsigned bytes)
621{
622 kfree(buf);
623}
624
625static int at91_ep_queue(struct usb_ep *_ep,
626 struct usb_request *_req, gfp_t gfp_flags)
627{
628 struct at91_request *req;
629 struct at91_ep *ep;
630 struct at91_udc *dev;
631 int status;
632 unsigned long flags;
633
634 req = container_of(_req, struct at91_request, req);
635 ep = container_of(_ep, struct at91_ep, ep);
636
637 if (!_req || !_req->complete
638 || !_req->buf || !list_empty(&req->queue)) {
639 DBG("invalid request\n");
640 return -EINVAL;
641 }
642
643 if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
644 DBG("invalid ep\n");
645 return -EINVAL;
646 }
647
648 dev = ep->udc;
649
650 if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
651 DBG("invalid device\n");
652 return -EINVAL;
653 }
654
655 _req->status = -EINPROGRESS;
656 _req->actual = 0;
657
658 local_irq_save(flags);
659
660 /* try to kickstart any empty and idle queue */
661 if (list_empty(&ep->queue) && !ep->stopped) {
662 int is_ep0;
663
664 /*
665 * If this control request has a non-empty DATA stage, this
666 * will start that stage. It works just like a non-control
667 * request (until the status stage starts, maybe early).
668 *
669 * If the data stage is empty, then this starts a successful
670 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
671 */
672 is_ep0 = (ep->ep.name == ep0name);
673 if (is_ep0) {
674 u32 tmp;
675
676 if (!dev->req_pending) {
677 status = -EINVAL;
678 goto done;
679 }
680
681 /*
682 * defer changing CONFG until after the gadget driver
683 * reconfigures the endpoints.
684 */
685 if (dev->wait_for_config_ack) {
ffd3326b 686 tmp = at91_udp_read(dev, AT91_UDP_GLB_STAT);
bae4bd84
DB		 687 tmp ^= AT91_UDP_CONFG;
688 VDBG("toggle config\n");
ffd3326b 689 at91_udp_write(dev, AT91_UDP_GLB_STAT, tmp);
bae4bd84
DB		 690 }
691 if (req->req.length == 0) {
692ep0_in_status:
693 PACKET("ep0 in/status\n");
694 status = 0;
695 tmp = __raw_readl(ep->creg);
696 tmp &= ~SET_FX;
697 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
698 __raw_writel(tmp, ep->creg);
699 dev->req_pending = 0;
700 goto done;
701 }
702 }
703
704 if (ep->is_in)
705 status = write_fifo(ep, req);
706 else {
707 status = read_fifo(ep, req);
708
709 /* IN/STATUS stage is otherwise triggered by irq */
710 if (status && is_ep0)
711 goto ep0_in_status;
712 }
713 } else
714 status = 0;
715
716 if (req && !status) {
717 list_add_tail (&req->queue, &ep->queue);
ffd3326b 718 at91_udp_write(dev, AT91_UDP_IER, ep->int_mask);
bae4bd84
DB		 719 }
720done:
721 local_irq_restore(flags);
722 return (status < 0) ? status : 0;
723}
724
725static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
726{
727 struct at91_ep *ep;
728 struct at91_request *req;
729
730 ep = container_of(_ep, struct at91_ep, ep);
731 if (!_ep || ep->ep.name == ep0name)
732 return -EINVAL;
733
734 /* make sure it's actually queued on this endpoint */
735 list_for_each_entry (req, &ep->queue, queue) {
736 if (&req->req == _req)
737 break;
738 }
739 if (&req->req != _req)
740 return -EINVAL;
741
742 done(ep, req, -ECONNRESET);
743 return 0;
744}
745
746static int at91_ep_set_halt(struct usb_ep *_ep, int value)
747{
748 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
ffd3326b 749 struct at91_udc *udc = ep->udc;
bae4bd84
DB		 750 u32 __iomem *creg;
751 u32 csr;
752 unsigned long flags;
753 int status = 0;
754
755 if (!_ep || ep->is_iso || !ep->udc->clocked)
756 return -EINVAL;
757
758 creg = ep->creg;
759 local_irq_save(flags);
760
761 csr = __raw_readl(creg);
762
763 /*
764 * fail with still-busy IN endpoints, ensuring correct sequencing
765 * of data tx then stall. note that the fifo rx bytecount isn't
766 * completely accurate as a tx bytecount.
767 */
768 if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
769 status = -EAGAIN;
770 else {
771 csr |= CLR_FX;
772 csr &= ~SET_FX;
773 if (value) {
774 csr |= AT91_UDP_FORCESTALL;
775 VDBG("halt %s\n", ep->ep.name);
776 } else {
ffd3326b
AV		 777 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
778 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
bae4bd84
DB		 779 csr &= ~AT91_UDP_FORCESTALL;
780 }
781 __raw_writel(csr, creg);
782 }
783
784 local_irq_restore(flags);
785 return status;
786}
787
788static struct usb_ep_ops at91_ep_ops = {
789 .enable = at91_ep_enable,
790 .disable = at91_ep_disable,
791 .alloc_request = at91_ep_alloc_request,
792 .free_request = at91_ep_free_request,
793 .alloc_buffer = at91_ep_alloc_buffer,
794 .free_buffer = at91_ep_free_buffer,
795 .queue = at91_ep_queue,
796 .dequeue = at91_ep_dequeue,
797 .set_halt = at91_ep_set_halt,
798 // there's only imprecise fifo status reporting
799};
800
801/*-------------------------------------------------------------------------*/
802
803static int at91_get_frame(struct usb_gadget *gadget)
804{
ffd3326b
AV		 805 struct at91_udc *udc = to_udc(gadget);
806
bae4bd84
DB		 807 if (!to_udc(gadget)->clocked)
808 return -EINVAL;
ffd3326b 809 return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
bae4bd84
DB		 810}
811
812static int at91_wakeup(struct usb_gadget *gadget)
813{
814 struct at91_udc *udc = to_udc(gadget);
815 u32 glbstate;
816 int status = -EINVAL;
817 unsigned long flags;
818
819 DBG("%s\n", __FUNCTION__ );
820 local_irq_save(flags);
821
822 if (!udc->clocked || !udc->suspended)
823 goto done;
824
825 /* NOTE: some "early versions" handle ESR differently ... */
826
ffd3326b 827 glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
bae4bd84
DB		 828 if (!(glbstate & AT91_UDP_ESR))
829 goto done;
830 glbstate |= AT91_UDP_ESR;
ffd3326b 831 at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
bae4bd84
DB		 832
833done:
834 local_irq_restore(flags);
835 return status;
836}
837
838/* reinit == restore inital software state */
839static void udc_reinit(struct at91_udc *udc)
840{
841 u32 i;
842
843 INIT_LIST_HEAD(&udc->gadget.ep_list);
844 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
845
846 for (i = 0; i < NUM_ENDPOINTS; i++) {
847 struct at91_ep *ep = &udc->ep[i];
848
849 if (i != 0)
850 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
851 ep->desc = NULL;
852 ep->stopped = 0;
853 ep->fifo_bank = 0;
854 ep->ep.maxpacket = ep->maxpacket;
ffd3326b 855 ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
bae4bd84
DB		 856 // initialiser une queue par endpoint
857 INIT_LIST_HEAD(&ep->queue);
858 }
859}
860
861static void stop_activity(struct at91_udc *udc)
862{
863 struct usb_gadget_driver *driver = udc->driver;
864 int i;
865
866 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
867 driver = NULL;
868 udc->gadget.speed = USB_SPEED_UNKNOWN;
8b2e7668 869 udc->suspended = 0;
bae4bd84
DB		 870
871 for (i = 0; i < NUM_ENDPOINTS; i++) {
872 struct at91_ep *ep = &udc->ep[i];
873 ep->stopped = 1;
874 nuke(ep, -ESHUTDOWN);
875 }
876 if (driver)
877 driver->disconnect(&udc->gadget);
878
879 udc_reinit(udc);
880}
881
882static void clk_on(struct at91_udc *udc)
883{
884 if (udc->clocked)
885 return;
886 udc->clocked = 1;
887 clk_enable(udc->iclk);
888 clk_enable(udc->fclk);
889}
890
891static void clk_off(struct at91_udc *udc)
892{
893 if (!udc->clocked)
894 return;
895 udc->clocked = 0;
896 udc->gadget.speed = USB_SPEED_UNKNOWN;
bae4bd84 897 clk_disable(udc->fclk);
8b2e7668 898 clk_disable(udc->iclk);
bae4bd84
DB		 899}
900
901/*
902 * activate/deactivate link with host; minimize power usage for
903 * inactive links by cutting clocks and transceiver power.
904 */
905static void pullup(struct at91_udc *udc, int is_on)
906{
907 if (!udc->enabled || !udc->vbus)
908 is_on = 0;
909 DBG("%sactive\n", is_on ? "" : "in");
ffd3326b 910
bae4bd84
DB		 911 if (is_on) {
912 clk_on(udc);
ffd3326b 913 at91_udp_write(udc, AT91_UDP_TXVC, 0);
29ba4b53
AV		 914 if (cpu_is_at91rm9200())
915 at91_set_gpio_value(udc->board.pullup_pin, 1);
916 else if (cpu_is_at91sam9260()) {
917 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
918
919 txvc |= AT91_UDP_TXVC_PUON;
920 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
921 } else if (cpu_is_at91sam9261()) {
922 u32 usbpucr;
923
924 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
925 usbpucr |= AT91_MATRIX_USBPUCR_PUON;
926 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
927 }
ffd3326b 928 } else {
bae4bd84 929 stop_activity(udc);
ffd3326b 930 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
29ba4b53
AV		 931 if (cpu_is_at91rm9200())
932 at91_set_gpio_value(udc->board.pullup_pin, 0);
933 else if (cpu_is_at91sam9260()) {
934 u32 txvc = at91_udp_read(udc, AT91_UDP_TXVC);
935
936 txvc &= ~AT91_UDP_TXVC_PUON;
937 at91_udp_write(udc, AT91_UDP_TXVC, txvc);
938 } else if (cpu_is_at91sam9261()) {
939 u32 usbpucr;
940
941 usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
942 usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
943 at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
944 }
bae4bd84 945 clk_off(udc);
bae4bd84
DB		 946 }
947}
948
949/* vbus is here! turn everything on that's ready */
950static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
951{
952 struct at91_udc *udc = to_udc(gadget);
953 unsigned long flags;
954
955 // VDBG("vbus %s\n", is_active ? "on" : "off");
956 local_irq_save(flags);
957 udc->vbus = (is_active != 0);
bfb7fb79
WK		 958 if (udc->driver)
959 pullup(udc, is_active);
960 else
961 pullup(udc, 0);
bae4bd84
DB		 962 local_irq_restore(flags);
963 return 0;
964}
965
966static int at91_pullup(struct usb_gadget *gadget, int is_on)
967{
968 struct at91_udc *udc = to_udc(gadget);
969 unsigned long flags;
970
971 local_irq_save(flags);
972 udc->enabled = is_on = !!is_on;
973 pullup(udc, is_on);
974 local_irq_restore(flags);
975 return 0;
976}
977
978static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
979{
980 struct at91_udc *udc = to_udc(gadget);
981 unsigned long flags;
982
983 local_irq_save(flags);
984 udc->selfpowered = (is_on != 0);
985 local_irq_restore(flags);
986 return 0;
987}
988
989static const struct usb_gadget_ops at91_udc_ops = {
990 .get_frame = at91_get_frame,
991 .wakeup = at91_wakeup,
992 .set_selfpowered = at91_set_selfpowered,
993 .vbus_session = at91_vbus_session,
994 .pullup = at91_pullup,
995
996 /*
997 * VBUS-powered devices may also also want to support bigger
998 * power budgets after an appropriate SET_CONFIGURATION.
999 */
1000 // .vbus_power = at91_vbus_power,
1001};
1002
1003/*-------------------------------------------------------------------------*/
1004
1005static 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
1042union setup {
1043 u8 raw[8];
1044 struct usb_ctrlrequest r;
1045};
1046
1047static 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:
ffd3326b 1111 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
bae4bd84
DB		 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->selfpowered << USB_DEVICE_SELF_POWERED);
ffd3326b 1128 if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
bae4bd84
DB		 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;
ffd3326b 1139 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
bae4bd84 1140 tmp |= AT91_UDP_ESR;
ffd3326b 1141 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
bae4bd84
DB		 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;
ffd3326b 1147 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
bae4bd84 1148 tmp &= ~AT91_UDP_ESR;
ffd3326b 1149 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
bae4bd84
DB		 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->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->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->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
ffd3326b
AV		 1231 at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
1232 at91_udp_write(udc, AT91_UDP_RST_EP, 0);
bae4bd84
DB		 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 */
bfb7fb79
WK		 1247 if (udc->driver)
1248 status = udc->driver->setup(&udc->gadget, &pkt.r);
1249 else
1250 status = -ENODEV;
bae4bd84
DB		 1251 if (status < 0) {
1252stall:
1253 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1254 pkt.r.bRequestType, pkt.r.bRequest, status);
1255 csr |= AT91_UDP_FORCESTALL;
1256 __raw_writel(csr, creg);
1257 udc->req_pending = 0;
1258 }
1259 return;
1260
1261succeed:
1262 /* immediate successful (IN) STATUS after zero length DATA */
1263 PACKET("ep0 in/status\n");
1264write_in:
1265 csr |= AT91_UDP_TXPKTRDY;
1266 __raw_writel(csr, creg);
1267 udc->req_pending = 0;
1268 return;
1269}
1270
1271static void handle_ep0(struct at91_udc *udc)
1272{
1273 struct at91_ep *ep0 = &udc->ep[0];
1274 u32 __iomem *creg = ep0->creg;
1275 u32 csr = __raw_readl(creg);
1276 struct at91_request *req;
1277
1278 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1279 nuke(ep0, -EPROTO);
1280 udc->req_pending = 0;
1281 csr |= CLR_FX;
1282 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1283 __raw_writel(csr, creg);
1284 VDBG("ep0 stalled\n");
1285 csr = __raw_readl(creg);
1286 }
1287 if (csr & AT91_UDP_RXSETUP) {
1288 nuke(ep0, 0);
1289 udc->req_pending = 0;
1290 handle_setup(udc, ep0, csr);
1291 return;
1292 }
1293
1294 if (list_empty(&ep0->queue))
1295 req = NULL;
1296 else
1297 req = list_entry(ep0->queue.next, struct at91_request, queue);
1298
1299 /* host ACKed an IN packet that we sent */
1300 if (csr & AT91_UDP_TXCOMP) {
1301 csr |= CLR_FX;
1302 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1303
1304 /* write more IN DATA? */
1305 if (req && ep0->is_in) {
1306 if (handle_ep(ep0))
1307 udc->req_pending = 0;
1308
1309 /*
1310 * Ack after:
1311 * - last IN DATA packet (including GET_STATUS)
1312 * - IN/STATUS for OUT DATA
1313 * - IN/STATUS for any zero-length DATA stage
1314 * except for the IN DATA case, the host should send
1315 * an OUT status later, which we'll ack.
1316 */
1317 } else {
1318 udc->req_pending = 0;
1319 __raw_writel(csr, creg);
1320
1321 /*
1322 * SET_ADDRESS takes effect only after the STATUS
1323 * (to the original address) gets acked.
1324 */
1325 if (udc->wait_for_addr_ack) {
1326 u32 tmp;
1327
ffd3326b 1328 at91_udp_write(udc, AT91_UDP_FADDR,
8b2e7668 1329 AT91_UDP_FEN | udc->addr);
ffd3326b 1330 tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
bae4bd84
DB		 1331 tmp &= ~AT91_UDP_FADDEN;
1332 if (udc->addr)
1333 tmp |= AT91_UDP_FADDEN;
ffd3326b 1334 at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
bae4bd84
DB		 1335
1336 udc->wait_for_addr_ack = 0;
1337 VDBG("address %d\n", udc->addr);
1338 }
1339 }
1340 }
1341
1342 /* OUT packet arrived ... */
1343 else if (csr & AT91_UDP_RX_DATA_BK0) {
1344 csr |= CLR_FX;
1345 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1346
1347 /* OUT DATA stage */
1348 if (!ep0->is_in) {
1349 if (req) {
1350 if (handle_ep(ep0)) {
1351 /* send IN/STATUS */
1352 PACKET("ep0 in/status\n");
1353 csr = __raw_readl(creg);
1354 csr &= ~SET_FX;
1355 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1356 __raw_writel(csr, creg);
1357 udc->req_pending = 0;
1358 }
1359 } else if (udc->req_pending) {
1360 /*
1361 * AT91 hardware has a hard time with this
1362 * "deferred response" mode for control-OUT
1363 * transfers. (For control-IN it's fine.)
1364 *
1365 * The normal solution leaves OUT data in the
1366 * fifo until the gadget driver is ready.
1367 * We couldn't do that here without disabling
1368 * the IRQ that tells about SETUP packets,
1369 * e.g. when the host gets impatient...
1370 *
1371 * Working around it by copying into a buffer
1372 * would almost be a non-deferred response,
1373 * except that it wouldn't permit reliable
1374 * stalling of the request. Instead, demand
1375 * that gadget drivers not use this mode.
1376 */
1377 DBG("no control-OUT deferred responses!\n");
1378 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1379 udc->req_pending = 0;
1380 }
1381
1382 /* STATUS stage for control-IN; ack. */
1383 } else {
1384 PACKET("ep0 out/status ACK\n");
1385 __raw_writel(csr, creg);
1386
1387 /* "early" status stage */
1388 if (req)
1389 done(ep0, req, 0);
1390 }
1391 }
1392}
1393
7d12e780 1394static irqreturn_t at91_udc_irq (int irq, void *_udc)
bae4bd84
DB		 1395{
1396 struct at91_udc *udc = _udc;
1397 u32 rescans = 5;
1398
1399 while (rescans--) {
8b2e7668 1400 u32 status;
bae4bd84 1401
ffd3326b
AV		 1402 status = at91_udp_read(udc, AT91_UDP_ISR)
1403 & at91_udp_read(udc, AT91_UDP_IMR);
bae4bd84
DB		 1404 if (!status)
1405 break;
1406
1407 /* USB reset irq: not maskable */
1408 if (status & AT91_UDP_ENDBUSRES) {
ffd3326b
AV		 1409 at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1410 at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
bae4bd84 1411 /* Atmel code clears this irq twice */
ffd3326b
AV		 1412 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1413 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
bae4bd84
DB		 1414 VDBG("end bus reset\n");
1415 udc->addr = 0;
1416 stop_activity(udc);
1417
1418 /* enable ep0 */
ffd3326b 1419 at91_udp_write(udc, AT91_UDP_CSR(0),
8b2e7668 1420 AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
bae4bd84
DB		 1421 udc->gadget.speed = USB_SPEED_FULL;
1422 udc->suspended = 0;
ffd3326b 1423 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
bae4bd84
DB		 1424
1425 /*
1426 * NOTE: this driver keeps clocks off unless the
8b2e7668
DB		 1427 * USB host is present. That saves power, but for
1428 * boards that don't support VBUS detection, both
1429 * clocks need to be active most of the time.
bae4bd84
DB		 1430 */
1431
1432 /* host initiated suspend (3+ms bus idle) */
1433 } else if (status & AT91_UDP_RXSUSP) {
ffd3326b
AV		 1434 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
1435 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
1436 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
bae4bd84
DB		 1437 // VDBG("bus suspend\n");
1438 if (udc->suspended)
1439 continue;
1440 udc->suspended = 1;
1441
1442 /*
1443 * NOTE: when suspending a VBUS-powered device, the
1444 * gadget driver should switch into slow clock mode
1445 * and then into standby to avoid drawing more than
1446 * 500uA power (2500uA for some high-power configs).
1447 */
1448 if (udc->driver && udc->driver->suspend)
1449 udc->driver->suspend(&udc->gadget);
1450
1451 /* host initiated resume */
1452 } else if (status & AT91_UDP_RXRSM) {
ffd3326b
AV		 1453 at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
1454 at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
1455 at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
bae4bd84
DB		 1456 // VDBG("bus resume\n");
1457 if (!udc->suspended)
1458 continue;
1459 udc->suspended = 0;
1460
1461 /*
1462 * NOTE: for a VBUS-powered device, the gadget driver
1463 * would normally want to switch out of slow clock
1464 * mode into normal mode.
1465 */
1466 if (udc->driver && udc->driver->resume)
1467 udc->driver->resume(&udc->gadget);
1468
1469 /* endpoint IRQs are cleared by handling them */
1470 } else {
1471 int i;
1472 unsigned mask = 1;
1473 struct at91_ep *ep = &udc->ep[1];
1474
1475 if (status & mask)
1476 handle_ep0(udc);
1477 for (i = 1; i < NUM_ENDPOINTS; i++) {
1478 mask <<= 1;
1479 if (status & mask)
1480 handle_ep(ep);
1481 ep++;
1482 }
1483 }
1484 }
1485
1486 return IRQ_HANDLED;
1487}
1488
1489/*-------------------------------------------------------------------------*/
1490
8b2e7668
DB		 1491static void nop_release(struct device *dev)
1492{
1493 /* nothing to free */
1494}
1495
bae4bd84
DB		 1496static struct at91_udc controller = {
1497 .gadget = {
8b2e7668
DB		 1498 .ops = &at91_udc_ops,
1499 .ep0 = &controller.ep[0].ep,
1500 .name = driver_name,
1501 .dev = {
1502 .bus_id = "gadget",
1503 .release = nop_release,
bae4bd84
DB		 1504 }
1505 },
1506 .ep[0] = {
1507 .ep = {
1508 .name = ep0name,
1509 .ops = &at91_ep_ops,
1510 },
1511 .udc = &controller,
1512 .maxpacket = 8,
bae4bd84
DB		 1513 .int_mask = 1 << 0,
1514 },
1515 .ep[1] = {
1516 .ep = {
1517 .name = "ep1",
1518 .ops = &at91_ep_ops,
1519 },
1520 .udc = &controller,
1521 .is_pingpong = 1,
1522 .maxpacket = 64,
bae4bd84
DB		 1523 .int_mask = 1 << 1,
1524 },
1525 .ep[2] = {
1526 .ep = {
1527 .name = "ep2",
1528 .ops = &at91_ep_ops,
1529 },
1530 .udc = &controller,
1531 .is_pingpong = 1,
1532 .maxpacket = 64,
bae4bd84
DB		 1533 .int_mask = 1 << 2,
1534 },
1535 .ep[3] = {
1536 .ep = {
1537 /* could actually do bulk too */
1538 .name = "ep3-int",
1539 .ops = &at91_ep_ops,
1540 },
1541 .udc = &controller,
1542 .maxpacket = 8,
bae4bd84
DB		 1543 .int_mask = 1 << 3,
1544 },
1545 .ep[4] = {
1546 .ep = {
1547 .name = "ep4",
1548 .ops = &at91_ep_ops,
1549 },
1550 .udc = &controller,
1551 .is_pingpong = 1,
1552 .maxpacket = 256,
bae4bd84
DB		 1553 .int_mask = 1 << 4,
1554 },
1555 .ep[5] = {
1556 .ep = {
1557 .name = "ep5",
1558 .ops = &at91_ep_ops,
1559 },
1560 .udc = &controller,
1561 .is_pingpong = 1,
1562 .maxpacket = 256,
bae4bd84
DB		 1563 .int_mask = 1 << 5,
1564 },
8b2e7668 1565 /* ep6 and ep7 are also reserved (custom silicon might use them) */
bae4bd84
DB		 1566};
1567
7d12e780 1568static irqreturn_t at91_vbus_irq(int irq, void *_udc)
bae4bd84
DB		 1569{
1570 struct at91_udc *udc = _udc;
1571 unsigned value;
1572
1573 /* vbus needs at least brief debouncing */
1574 udelay(10);
1575 value = at91_get_gpio_value(udc->board.vbus_pin);
1576 if (value != udc->vbus)
1577 at91_vbus_session(&udc->gadget, value);
1578
1579 return IRQ_HANDLED;
1580}
1581
1582int usb_gadget_register_driver (struct usb_gadget_driver *driver)
1583{
1584 struct at91_udc *udc = &controller;
1585 int retval;
1586
1587 if (!driver
bc92c32a 1588 || driver->speed < USB_SPEED_FULL
bae4bd84 1589 || !driver->bind
bae4bd84
DB		 1590 || !driver->setup) {
1591 DBG("bad parameter.\n");
1592 return -EINVAL;
1593 }
1594
1595 if (udc->driver) {
1596 DBG("UDC already has a gadget driver\n");
1597 return -EBUSY;
1598 }
1599
1600 udc->driver = driver;
1601 udc->gadget.dev.driver = &driver->driver;
1602 udc->gadget.dev.driver_data = &driver->driver;
1603 udc->enabled = 1;
1604 udc->selfpowered = 1;
1605
1606 retval = driver->bind(&udc->gadget);
1607 if (retval) {
1608 DBG("driver->bind() returned %d\n", retval);
1609 udc->driver = NULL;
943c4419
WK		 1610 udc->gadget.dev.driver = NULL;
1611 udc->gadget.dev.driver_data = NULL;
1612 udc->enabled = 0;
1613 udc->selfpowered = 0;
bae4bd84
DB		 1614 return retval;
1615 }
1616
1617 local_irq_disable();
1618 pullup(udc, 1);
1619 local_irq_enable();
1620
1621 DBG("bound to %s\n", driver->driver.name);
1622 return 0;
1623}
1624EXPORT_SYMBOL (usb_gadget_register_driver);
1625
1626int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
1627{
1628 struct at91_udc *udc = &controller;
1629
6bea476c 1630 if (!driver || driver != udc->driver || !driver->unbind)
bae4bd84
DB		 1631 return -EINVAL;
1632
1633 local_irq_disable();
1634 udc->enabled = 0;
ffd3326b 1635 at91_udp_write(udc, AT91_UDP_IDR, ~0);
bae4bd84
DB		 1636 pullup(udc, 0);
1637 local_irq_enable();
1638
1639 driver->unbind(&udc->gadget);
1640 udc->driver = NULL;
1641
1642 DBG("unbound from %s\n", driver->driver.name);
1643 return 0;
1644}
1645EXPORT_SYMBOL (usb_gadget_unregister_driver);
1646
1647/*-------------------------------------------------------------------------*/
1648
1649static void at91udc_shutdown(struct platform_device *dev)
1650{
1651 /* force disconnect on reboot */
1652 pullup(platform_get_drvdata(dev), 0);
1653}
1654
1655static int __devinit at91udc_probe(struct platform_device *pdev)
1656{
1657 struct device *dev = &pdev->dev;
1658 struct at91_udc *udc;
1659 int retval;
ffd3326b 1660 struct resource *res;
bae4bd84
DB		 1661
1662 if (!dev->platform_data) {
1663 /* small (so we copy it) but critical! */
1664 DBG("missing platform_data\n");
1665 return -ENODEV;
1666 }
1667
8b2e7668
DB		 1668 if (pdev->num_resources != 2) {
1669 DBG("invalid num_resources");
1670 return -ENODEV;
1671 }
1672 if ((pdev->resource[0].flags != IORESOURCE_MEM)
1673 || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1674 DBG("invalid resource type");
1675 return -ENODEV;
1676 }
1677
ffd3326b
AV		 1678 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1679 if (!res)
1680 return -ENXIO;
1681
1682 if (!request_mem_region(res->start,
1683 res->end - res->start + 1,
1684 driver_name)) {
bae4bd84
DB		 1685 DBG("someone's using UDC memory\n");
1686 return -EBUSY;
1687 }
1688
1689 /* init software state */
1690 udc = &controller;
1691 udc->gadget.dev.parent = dev;
1692 udc->board = *(struct at91_udc_data *) dev->platform_data;
1693 udc->pdev = pdev;
bae4bd84
DB		 1694 udc->enabled = 0;
1695
ffd3326b
AV		 1696 udc->udp_baseaddr = ioremap(res->start, res->end - res->start + 1);
1697 if (!udc->udp_baseaddr) {
1698 release_mem_region(res->start, res->end - res->start + 1);
1699 return -ENOMEM;
1700 }
1701
1702 udc_reinit(udc);
1703
bae4bd84
DB		 1704 /* get interface and function clocks */
1705 udc->iclk = clk_get(dev, "udc_clk");
1706 udc->fclk = clk_get(dev, "udpck");
1707 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
1708 DBG("clocks missing\n");
29ba4b53
AV		 1709 retval = -ENODEV;
1710 goto fail0;
bae4bd84
DB		 1711 }
1712
1713 retval = device_register(&udc->gadget.dev);
1714 if (retval < 0)
1715 goto fail0;
1716
8b2e7668
DB		 1717 /* don't do anything until we have both gadget driver and VBUS */
1718 clk_enable(udc->iclk);
ffd3326b
AV		 1719 at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
1720 at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
29ba4b53
AV		 1721 /* Clear all pending interrupts - UDP may be used by bootloader. */
1722 at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
8b2e7668 1723 clk_disable(udc->iclk);
bae4bd84
DB		 1724
1725 /* request UDC and maybe VBUS irqs */
8b2e7668
DB		 1726 udc->udp_irq = platform_get_irq(pdev, 0);
1727 if (request_irq(udc->udp_irq, at91_udc_irq,
1728 IRQF_DISABLED, driver_name, udc)) {
1729 DBG("request irq %d failed\n", udc->udp_irq);
bae4bd84
DB		 1730 retval = -EBUSY;
1731 goto fail1;
1732 }
1733 if (udc->board.vbus_pin > 0) {
29ba4b53
AV		 1734 /*
1735 * Get the initial state of VBUS - we cannot expect
1736 * a pending interrupt.
1737 */
1738 udc->vbus = at91_get_gpio_value(udc->board.vbus_pin);
8b2e7668
DB		 1739 if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
1740 IRQF_DISABLED, driver_name, udc)) {
1741 DBG("request vbus irq %d failed\n",
1742 udc->board.vbus_pin);
1743 free_irq(udc->udp_irq, udc);
bae4bd84
DB		 1744 retval = -EBUSY;
1745 goto fail1;
1746 }
1747 } else {
1748 DBG("no VBUS detection, assuming always-on\n");
1749 udc->vbus = 1;
1750 }
1751 dev_set_drvdata(dev, udc);
8b2e7668 1752 device_init_wakeup(dev, 1);
bae4bd84
DB		 1753 create_debug_file(udc);
1754
1755 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1756 return 0;
1757
1758fail1:
1759 device_unregister(&udc->gadget.dev);
1760fail0:
ffd3326b 1761 release_mem_region(res->start, res->end - res->start + 1);
bae4bd84
DB		 1762 DBG("%s probe failed, %d\n", driver_name, retval);
1763 return retval;
1764}
1765
8b2e7668 1766static int __devexit at91udc_remove(struct platform_device *pdev)
bae4bd84 1767{
8b2e7668 1768 struct at91_udc *udc = platform_get_drvdata(pdev);
ffd3326b 1769 struct resource *res;
bae4bd84
DB		 1770
1771 DBG("remove\n");
1772
6bea476c
DB		 1773 if (udc->driver)
1774 return -EBUSY;
bae4bd84 1775
6bea476c 1776 pullup(udc, 0);
bae4bd84 1777
8b2e7668 1778 device_init_wakeup(&pdev->dev, 0);
bae4bd84
DB		 1779 remove_debug_file(udc);
1780 if (udc->board.vbus_pin > 0)
1781 free_irq(udc->board.vbus_pin, udc);
8b2e7668 1782 free_irq(udc->udp_irq, udc);
bae4bd84 1783 device_unregister(&udc->gadget.dev);
ffd3326b
AV		 1784
1785 iounmap(udc->udp_baseaddr);
1786 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1787 release_mem_region(res->start, res->end - res->start + 1);
bae4bd84
DB		 1788
1789 clk_put(udc->iclk);
1790 clk_put(udc->fclk);
1791
1792 return 0;
1793}
1794
1795#ifdef CONFIG_PM
8b2e7668 1796static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
bae4bd84 1797{
8b2e7668
DB		 1798 struct at91_udc *udc = platform_get_drvdata(pdev);
1799 int wake = udc->driver && device_may_wakeup(&pdev->dev);
bae4bd84 1800
8b2e7668
DB		 1801 /* Unless we can act normally to the host (letting it wake us up
1802 * whenever it has work for us) force disconnect. Wakeup requires
1803 * PLLB for USB events (signaling for reset, wakeup, or incoming
1804 * tokens) and VBUS irqs (on systems which support them).
bae4bd84 1805 */
8b2e7668
DB		 1806 if ((!udc->suspended && udc->addr)
1807 || !wake
1808 || at91_suspend_entering_slow_clock()) {
bae4bd84 1809 pullup(udc, 0);
8b2e7668
DB		 1810 disable_irq_wake(udc->udp_irq);
1811 } else
1812 enable_irq_wake(udc->udp_irq);
1813
1814 if (udc->board.vbus_pin > 0) {
1815 if (wake)
1816 enable_irq_wake(udc->board.vbus_pin);
1817 else
1818 disable_irq_wake(udc->board.vbus_pin);
1819 }
bae4bd84
DB		 1820 return 0;
1821}
1822
8b2e7668 1823static int at91udc_resume(struct platform_device *pdev)
bae4bd84 1824{
8b2e7668 1825 struct at91_udc *udc = platform_get_drvdata(pdev);
bae4bd84
DB		 1826
1827 /* maybe reconnect to host; if so, clocks on */
1828 pullup(udc, 1);
1829 return 0;
1830}
1831#else
1832#define at91udc_suspend NULL
1833#define at91udc_resume NULL
1834#endif
1835
1836static struct platform_driver at91_udc = {
1837 .probe = at91udc_probe,
1838 .remove = __devexit_p(at91udc_remove),
1839 .shutdown = at91udc_shutdown,
1840 .suspend = at91udc_suspend,
8b2e7668 1841 .resume = at91udc_resume,
bae4bd84
DB		 1842 .driver = {
1843 .name = (char *) driver_name,
1844 .owner = THIS_MODULE,
1845 },
1846};
1847
1848static int __devinit udc_init_module(void)
1849{
1850 return platform_driver_register(&at91_udc);
1851}
1852module_init(udc_init_module);
1853
1854static void __devexit udc_exit_module(void)
1855{
1856 platform_driver_unregister(&at91_udc);
1857}
1858module_exit(udc_exit_module);
1859
8b2e7668 1860MODULE_DESCRIPTION("AT91 udc driver");
bae4bd84
DB		 1861MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1862MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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