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authorDavid Brownell <david-b@pacbell.net>2006-01-22 13:32:37 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2006-03-20 17:49:56 -0500
commitbae4bd848dc0b7e6defc7a5d62834a35d1eed06d (patch)
tree17f942f787c55e96afd13edc30875138a40c125c /drivers/usb/gadget/at91_udc.c
parent39a269c09f854d3d98cbb755b3568175f04efa10 (diff)
[PATCH] USB: add support for AT91 gadget
This adds support for the USB peripheral controller on AT91 (rm9200, eventually also sam9261 or uClinux) platforms. More SOC support for Linux-USB ... an uncomplicated pure PIO driver. It'd be worth using this as a model, if you're starting a driver for some other peripheral controller. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/at91_udc.c')
-rw-r--r--drivers/usb/gadget/at91_udc.c1773
1 files changed, 1773 insertions, 0 deletions
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
new file mode 100644
index 000000000000..865858cfd1c2
--- /dev/null
+++ b/drivers/usb/gadget/at91_udc.c
@@ -0,0 +1,1773 @@
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
28#include <linux/config.h>
29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/platform_device.h>
32#include <linux/delay.h>
33#include <linux/ioport.h>
34#include <linux/sched.h>
35#include <linux/slab.h>
36#include <linux/smp_lock.h>
37#include <linux/errno.h>
38#include <linux/init.h>
39#include <linux/list.h>
40#include <linux/interrupt.h>
41#include <linux/proc_fs.h>
42#include <linux/clk.h>
43#include <linux/usb_ch9.h>
44#include <linux/usb_gadget.h>
45
46#include <asm/byteorder.h>
47#include <asm/io.h>
48#include <asm/irq.h>
49#include <asm/system.h>
50#include <asm/mach-types.h>
51
52#include <asm/arch/hardware.h>
53#include <asm/arch/gpio.h>
54#include <asm/arch/board.h>
55
56#include "at91_udc.h"
57
58
59/*
60 * This controller is simple and PIO-only. It's used in many AT91-series
61 * ARMv4T controllers, including the at91rm9200 (arm920T, with MMU),
62 * at91sam9261 (arm926ejs, with MMU), and several no-mmu versions.
63 *
64 * This driver expects the board has been wired with two GPIOs suppporting
65 * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the
66 * testing hasn't covered such cases.) The pullup is most important; it
67 * provides software control over whether the host enumerates the device.
68 * The VBUS sensing helps during enumeration, and allows both USB clocks
69 * (and the transceiver) to stay gated off until they're necessary, saving
70 * power. During USB suspend, the 48 MHz clock is gated off.
71 */
72
73#define DRIVER_VERSION "8 March 2005"
74
75static const char driver_name [] = "at91_udc";
76static const char ep0name[] = "ep0";
77
78/*-------------------------------------------------------------------------*/
79
80/*
81 * Read from a UDP register.
82 */
83static inline unsigned long at91_udp_read(unsigned int reg)
84{
85 void __iomem *udp_base = (void __iomem *)AT91_VA_BASE_UDP;
86
87 return __raw_readl(udp_base + reg);
88}
89
90/*
91 * Write to a UDP register.
92 */
93static inline void at91_udp_write(unsigned int reg, unsigned long value)
94{
95 void __iomem *udp_base = (void __iomem *)AT91_VA_BASE_UDP;
96
97 __raw_writel(value, udp_base + reg);
98}
99
100/*-------------------------------------------------------------------------*/
101
102#ifdef CONFIG_USB_GADGET_DEBUG_FILES
103
104#include <linux/seq_file.h>
105
106static const char debug_filename[] = "driver/udc";
107
108#define FOURBITS "%s%s%s%s"
109#define EIGHTBITS FOURBITS FOURBITS
110
111static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
112{
113 static char *types[] = {
114 "control", "out-iso", "out-bulk", "out-int",
115 "BOGUS", "in-iso", "in-bulk", "in-int"};
116
117 u32 csr;
118 struct at91_request *req;
119 unsigned long flags;
120
121 local_irq_save(flags);
122
123 csr = __raw_readl(ep->creg);
124
125 /* NOTE: not collecting per-endpoint irq statistics... */
126
127 seq_printf(s, "\n");
128 seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
129 ep->ep.name, ep->ep.maxpacket,
130 ep->is_in ? "in" : "out",
131 ep->is_iso ? " iso" : "",
132 ep->is_pingpong
133 ? (ep->fifo_bank ? "pong" : "ping")
134 : "",
135 ep->stopped ? " stopped" : "");
136 seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
137 csr,
138 (csr & 0x07ff0000) >> 16,
139 (csr & (1 << 15)) ? "enabled" : "disabled",
140 (csr & (1 << 11)) ? "DATA1" : "DATA0",
141 types[(csr & 0x700) >> 8],
142
143 /* iff type is control then print current direction */
144 (!(csr & 0x700))
145 ? ((csr & (1 << 7)) ? " IN" : " OUT")
146 : "",
147 (csr & (1 << 6)) ? " rxdatabk1" : "",
148 (csr & (1 << 5)) ? " forcestall" : "",
149 (csr & (1 << 4)) ? " txpktrdy" : "",
150
151 (csr & (1 << 3)) ? " stallsent" : "",
152 (csr & (1 << 2)) ? " rxsetup" : "",
153 (csr & (1 << 1)) ? " rxdatabk0" : "",
154 (csr & (1 << 0)) ? " txcomp" : "");
155 if (list_empty (&ep->queue))
156 seq_printf(s, "\t(queue empty)\n");
157
158 else list_for_each_entry (req, &ep->queue, queue) {
159 unsigned length = req->req.actual;
160
161 seq_printf(s, "\treq %p len %d/%d buf %p\n",
162 &req->req, length,
163 req->req.length, req->req.buf);
164 }
165 local_irq_restore(flags);
166}
167
168static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
169{
170 int i;
171
172 seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
173 (mask & (1 << 13)) ? " wakeup" : "",
174 (mask & (1 << 12)) ? " endbusres" : "",
175
176 (mask & (1 << 11)) ? " sofint" : "",
177 (mask & (1 << 10)) ? " extrsm" : "",
178 (mask & (1 << 9)) ? " rxrsm" : "",
179 (mask & (1 << 8)) ? " rxsusp" : "");
180 for (i = 0; i < 8; i++) {
181 if (mask & (1 << i))
182 seq_printf(s, " ep%d", i);
183 }
184 seq_printf(s, "\n");
185}
186
187static int proc_udc_show(struct seq_file *s, void *unused)
188{
189 struct at91_udc *udc = s->private;
190 struct at91_ep *ep;
191 u32 tmp;
192
193 seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);
194
195 seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
196 udc->vbus ? "present" : "off",
197 udc->enabled
198 ? (udc->vbus ? "active" : "enabled")
199 : "disabled",
200 udc->selfpowered ? "self" : "VBUS",
201 udc->suspended ? ", suspended" : "",
202 udc->driver ? udc->driver->driver.name : "(none)");
203
204 /* don't access registers when interface isn't clocked */
205 if (!udc->clocked) {
206 seq_printf(s, "(not clocked)\n");
207 return 0;
208 }
209
210 tmp = at91_udp_read(AT91_UDP_FRM_NUM);
211 seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
212 (tmp & AT91_UDP_FRM_OK) ? " ok" : "",
213 (tmp & AT91_UDP_FRM_ERR) ? " err" : "",
214 (tmp & AT91_UDP_NUM));
215
216 tmp = at91_udp_read(AT91_UDP_GLB_STAT);
217 seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
218 (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
219 (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
220 (tmp & AT91_UDP_ESR) ? " esr" : "",
221 (tmp & AT91_UDP_CONFG) ? " confg" : "",
222 (tmp & AT91_UDP_FADDEN) ? " fadden" : "");
223
224 tmp = at91_udp_read(AT91_UDP_FADDR);
225 seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp,
226 (tmp & AT91_UDP_FEN) ? " fen" : "",
227 (tmp & AT91_UDP_FADD));
228
229 proc_irq_show(s, "imr ", at91_udp_read(AT91_UDP_IMR));
230 proc_irq_show(s, "isr ", at91_udp_read(AT91_UDP_ISR));
231
232 if (udc->enabled && udc->vbus) {
233 proc_ep_show(s, &udc->ep[0]);
234 list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
235 if (ep->desc)
236 proc_ep_show(s, ep);
237 }
238 }
239 return 0;
240}
241
242static int proc_udc_open(struct inode *inode, struct file *file)
243{
244 return single_open(file, proc_udc_show, PDE(inode)->data);
245}
246
247static struct file_operations proc_ops = {
248 .open = proc_udc_open,
249 .read = seq_read,
250 .llseek = seq_lseek,
251 .release = single_release,
252};
253
254static void create_debug_file(struct at91_udc *udc)
255{
256 struct proc_dir_entry *pde;
257
258 pde = create_proc_entry (debug_filename, 0, NULL);
259 udc->pde = pde;
260 if (pde == NULL)
261 return;
262
263 pde->proc_fops = &proc_ops;
264 pde->data = udc;
265}
266
267static void remove_debug_file(struct at91_udc *udc)
268{
269 if (udc->pde)
270 remove_proc_entry(debug_filename, NULL);
271}
272
273#else
274
275static inline void create_debug_file(struct at91_udc *udc) {}
276static inline void remove_debug_file(struct at91_udc *udc) {}
277
278#endif
279
280
281/*-------------------------------------------------------------------------*/
282
283static void done(struct at91_ep *ep, struct at91_request *req, int status)
284{
285 unsigned stopped = ep->stopped;
286
287 list_del_init(&req->queue);
288 if (req->req.status == -EINPROGRESS)
289 req->req.status = status;
290 else
291 status = req->req.status;
292 if (status && status != -ESHUTDOWN)
293 VDBG("%s done %p, status %d\n", ep->ep.name, req, status);
294
295 ep->stopped = 1;
296 req->req.complete(&ep->ep, &req->req);
297 ep->stopped = stopped;
298
299 /* ep0 is always ready; other endpoints need a non-empty queue */
300 if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
301 at91_udp_write(AT91_UDP_IDR, ep->int_mask);
302}
303
304/*-------------------------------------------------------------------------*/
305
306/* bits indicating OUT fifo has data ready */
307#define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)
308
309/*
310 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
311 * back most of the value you just read (because of side effects, including
312 * bits that may change after reading and before writing).
313 *
314 * Except when changing a specific bit, always write values which:
315 * - clear SET_FX bits (setting them could change something)
316 * - set CLR_FX bits (clearing them could change something)
317 *
318 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
319 * that shouldn't normally be changed.
320 */
321#define SET_FX (AT91_UDP_TXPKTRDY)
322#define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
323
324/* pull OUT packet data from the endpoint's fifo */
325static int read_fifo (struct at91_ep *ep, struct at91_request *req)
326{
327 u32 __iomem *creg = ep->creg;
328 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
329 u32 csr;
330 u8 *buf;
331 unsigned int count, bufferspace, is_done;
332
333 buf = req->req.buf + req->req.actual;
334 bufferspace = req->req.length - req->req.actual;
335
336 /*
337 * there might be nothing to read if ep_queue() calls us,
338 * or if we already emptied both pingpong buffers
339 */
340rescan:
341 csr = __raw_readl(creg);
342 if ((csr & RX_DATA_READY) == 0)
343 return 0;
344
345 count = (csr & AT91_UDP_RXBYTECNT) >> 16;
346 if (count > ep->ep.maxpacket)
347 count = ep->ep.maxpacket;
348 if (count > bufferspace) {
349 DBG("%s buffer overflow\n", ep->ep.name);
350 req->req.status = -EOVERFLOW;
351 count = bufferspace;
352 }
353 __raw_readsb(dreg, buf, count);
354
355 /* release and swap pingpong mem bank */
356 csr |= CLR_FX;
357 if (ep->is_pingpong) {
358 if (ep->fifo_bank == 0) {
359 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
360 ep->fifo_bank = 1;
361 } else {
362 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
363 ep->fifo_bank = 0;
364 }
365 } else
366 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
367 __raw_writel(csr, creg);
368
369 req->req.actual += count;
370 is_done = (count < ep->ep.maxpacket);
371 if (count == bufferspace)
372 is_done = 1;
373
374 PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
375 is_done ? " (done)" : "");
376
377 /*
378 * avoid extra trips through IRQ logic for packets already in
379 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
380 */
381 if (is_done)
382 done(ep, req, 0);
383 else if (ep->is_pingpong) {
384 bufferspace -= count;
385 buf += count;
386 goto rescan;
387 }
388
389 return is_done;
390}
391
392/* load fifo for an IN packet */
393static int write_fifo(struct at91_ep *ep, struct at91_request *req)
394{
395 u32 __iomem *creg = ep->creg;
396 u32 csr = __raw_readl(creg);
397 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
398 unsigned total, count, is_last;
399
400 /*
401 * TODO: allow for writing two packets to the fifo ... that'll
402 * reduce the amount of IN-NAKing, but probably won't affect
403 * throughput much. (Unlike preventing OUT-NAKing!)
404 */
405
406 /*
407 * If ep_queue() calls us, the queue is empty and possibly in
408 * odd states like TXCOMP not yet cleared (we do it, saving at
409 * least one IRQ) or the fifo not yet being free. Those aren't
410 * issues normally (IRQ handler fast path).
411 */
412 if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
413 if (csr & AT91_UDP_TXCOMP) {
414 csr |= CLR_FX;
415 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
416 __raw_writel(csr, creg);
417 csr = __raw_readl(creg);
418 }
419 if (csr & AT91_UDP_TXPKTRDY)
420 return 0;
421 }
422
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, req->req.buf + req->req.actual, 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", __FUNCTION__, 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, const struct usb_endpoint_descriptor *desc)
477{
478 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
479 struct at91_udc *dev = ep->udc;
480 u16 maxpacket;
481 u32 tmp;
482 unsigned long flags;
483
484 if (!_ep || !ep
485 || !desc || ep->desc
486 || _ep->name == ep0name
487 || desc->bDescriptorType != USB_DT_ENDPOINT
488 || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0
489 || maxpacket > ep->maxpacket) {
490 DBG("bad ep or descriptor\n");
491 return -EINVAL;
492 }
493
494 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
495 DBG("bogus device state\n");
496 return -ESHUTDOWN;
497 }
498
499 tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
500 switch (tmp) {
501 case USB_ENDPOINT_XFER_CONTROL:
502 DBG("only one control endpoint\n");
503 return -EINVAL;
504 case USB_ENDPOINT_XFER_INT:
505 if (maxpacket > 64)
506 goto bogus_max;
507 break;
508 case USB_ENDPOINT_XFER_BULK:
509 switch (maxpacket) {
510 case 8:
511 case 16:
512 case 32:
513 case 64:
514 goto ok;
515 }
516bogus_max:
517 DBG("bogus maxpacket %d\n", maxpacket);
518 return -EINVAL;
519 case USB_ENDPOINT_XFER_ISOC:
520 if (!ep->is_pingpong) {
521 DBG("iso requires double buffering\n");
522 return -EINVAL;
523 }
524 break;
525 }
526
527ok:
528 local_irq_save(flags);
529
530 /* initialize endpoint to match this descriptor */
531 ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
532 ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
533 ep->stopped = 0;
534 if (ep->is_in)
535 tmp |= 0x04;
536 tmp <<= 8;
537 tmp |= AT91_UDP_EPEDS;
538 __raw_writel(tmp, ep->creg);
539
540 ep->desc = desc;
541 ep->ep.maxpacket = maxpacket;
542
543 /*
544 * reset/init endpoint fifo. NOTE: leaves fifo_bank alone,
545 * since endpoint resets don't reset hw pingpong state.
546 */
547 at91_udp_write(AT91_UDP_RST_EP, ep->int_mask);
548 at91_udp_write(AT91_UDP_RST_EP, 0);
549
550 local_irq_restore(flags);
551 return 0;
552}
553
554static int at91_ep_disable (struct usb_ep * _ep)
555{
556 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
557 unsigned long flags;
558
559 if (ep == &ep->udc->ep[0])
560 return -EINVAL;
561
562 local_irq_save(flags);
563
564 nuke(ep, -ESHUTDOWN);
565
566 /* restore the endpoint's pristine config */
567 ep->desc = NULL;
568 ep->ep.maxpacket = ep->maxpacket;
569
570 /* reset fifos and endpoint */
571 if (ep->udc->clocked) {
572 at91_udp_write(AT91_UDP_RST_EP, ep->int_mask);
573 at91_udp_write(AT91_UDP_RST_EP, 0);
574 __raw_writel(0, ep->creg);
575 }
576
577 local_irq_restore(flags);
578 return 0;
579}
580
581/*
582 * this is a PIO-only driver, so there's nothing
583 * interesting for request or buffer allocation.
584 */
585
586static struct usb_request *at91_ep_alloc_request (struct usb_ep *_ep, unsigned int gfp_flags)
587{
588 struct at91_request *req;
589
590 req = kcalloc(1, sizeof (struct at91_request), SLAB_KERNEL);
591 if (!req)
592 return NULL;
593
594 INIT_LIST_HEAD(&req->queue);
595 return &req->req;
596}
597
598static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
599{
600 struct at91_request *req;
601
602 req = container_of(_req, struct at91_request, req);
603 BUG_ON(!list_empty(&req->queue));
604 kfree(req);
605}
606
607static void *at91_ep_alloc_buffer(
608 struct usb_ep *_ep,
609 unsigned bytes,
610 dma_addr_t *dma,
611 gfp_t gfp_flags)
612{
613 *dma = ~0;
614 return kmalloc(bytes, gfp_flags);
615}
616
617static void at91_ep_free_buffer(
618 struct usb_ep *ep,
619 void *buf,
620 dma_addr_t dma,
621 unsigned bytes)
622{
623 kfree(buf);
624}
625
626static int at91_ep_queue(struct usb_ep *_ep,
627 struct usb_request *_req, gfp_t gfp_flags)
628{
629 struct at91_request *req;
630 struct at91_ep *ep;
631 struct at91_udc *dev;
632 int status;
633 unsigned long flags;
634
635 req = container_of(_req, struct at91_request, req);
636 ep = container_of(_ep, struct at91_ep, ep);
637
638 if (!_req || !_req->complete
639 || !_req->buf || !list_empty(&req->queue)) {
640 DBG("invalid request\n");
641 return -EINVAL;
642 }
643
644 if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
645 DBG("invalid ep\n");
646 return -EINVAL;
647 }
648
649 dev = ep->udc;
650
651 if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
652 DBG("invalid device\n");
653 return -EINVAL;
654 }
655
656 _req->status = -EINPROGRESS;
657 _req->actual = 0;
658
659 local_irq_save(flags);
660
661 /* try to kickstart any empty and idle queue */
662 if (list_empty(&ep->queue) && !ep->stopped) {
663 int is_ep0;
664
665 /*
666 * If this control request has a non-empty DATA stage, this
667 * will start that stage. It works just like a non-control
668 * request (until the status stage starts, maybe early).
669 *
670 * If the data stage is empty, then this starts a successful
671 * IN/STATUS stage. (Unsuccessful ones use set_halt.)
672 */
673 is_ep0 = (ep->ep.name == ep0name);
674 if (is_ep0) {
675 u32 tmp;
676
677 if (!dev->req_pending) {
678 status = -EINVAL;
679 goto done;
680 }
681
682 /*
683 * defer changing CONFG until after the gadget driver
684 * reconfigures the endpoints.
685 */
686 if (dev->wait_for_config_ack) {
687 tmp = at91_udp_read(AT91_UDP_GLB_STAT);
688 tmp ^= AT91_UDP_CONFG;
689 VDBG("toggle config\n");
690 at91_udp_write(AT91_UDP_GLB_STAT, tmp);
691 }
692 if (req->req.length == 0) {
693ep0_in_status:
694 PACKET("ep0 in/status\n");
695 status = 0;
696 tmp = __raw_readl(ep->creg);
697 tmp &= ~SET_FX;
698 tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
699 __raw_writel(tmp, ep->creg);
700 dev->req_pending = 0;
701 goto done;
702 }
703 }
704
705 if (ep->is_in)
706 status = write_fifo(ep, req);
707 else {
708 status = read_fifo(ep, req);
709
710 /* IN/STATUS stage is otherwise triggered by irq */
711 if (status && is_ep0)
712 goto ep0_in_status;
713 }
714 } else
715 status = 0;
716
717 if (req && !status) {
718 list_add_tail (&req->queue, &ep->queue);
719 at91_udp_write(AT91_UDP_IER, ep->int_mask);
720 }
721done:
722 local_irq_restore(flags);
723 return (status < 0) ? status : 0;
724}
725
726static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
727{
728 struct at91_ep *ep;
729 struct at91_request *req;
730
731 ep = container_of(_ep, struct at91_ep, ep);
732 if (!_ep || ep->ep.name == ep0name)
733 return -EINVAL;
734
735 /* make sure it's actually queued on this endpoint */
736 list_for_each_entry (req, &ep->queue, queue) {
737 if (&req->req == _req)
738 break;
739 }
740 if (&req->req != _req)
741 return -EINVAL;
742
743 done(ep, req, -ECONNRESET);
744 return 0;
745}
746
747static int at91_ep_set_halt(struct usb_ep *_ep, int value)
748{
749 struct at91_ep *ep = container_of(_ep, struct at91_ep, ep);
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 {
777 at91_udp_write(AT91_UDP_RST_EP, ep->int_mask);
778 at91_udp_write(AT91_UDP_RST_EP, 0);
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{
805 if (!to_udc(gadget)->clocked)
806 return -EINVAL;
807 return at91_udp_read(AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
808}
809
810static int at91_wakeup(struct usb_gadget *gadget)
811{
812 struct at91_udc *udc = to_udc(gadget);
813 u32 glbstate;
814 int status = -EINVAL;
815 unsigned long flags;
816
817 DBG("%s\n", __FUNCTION__ );
818 local_irq_save(flags);
819
820 if (!udc->clocked || !udc->suspended)
821 goto done;
822
823 /* NOTE: some "early versions" handle ESR differently ... */
824
825 glbstate = at91_udp_read(AT91_UDP_GLB_STAT);
826 if (!(glbstate & AT91_UDP_ESR))
827 goto done;
828 glbstate |= AT91_UDP_ESR;
829 at91_udp_write(AT91_UDP_GLB_STAT, glbstate);
830
831done:
832 local_irq_restore(flags);
833 return status;
834}
835
836/* reinit == restore inital software state */
837static void udc_reinit(struct at91_udc *udc)
838{
839 u32 i;
840
841 INIT_LIST_HEAD(&udc->gadget.ep_list);
842 INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);
843
844 for (i = 0; i < NUM_ENDPOINTS; i++) {
845 struct at91_ep *ep = &udc->ep[i];
846
847 if (i != 0)
848 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
849 ep->desc = NULL;
850 ep->stopped = 0;
851 ep->fifo_bank = 0;
852 ep->ep.maxpacket = ep->maxpacket;
853 // initialiser une queue par endpoint
854 INIT_LIST_HEAD(&ep->queue);
855 }
856}
857
858static void stop_activity(struct at91_udc *udc)
859{
860 struct usb_gadget_driver *driver = udc->driver;
861 int i;
862
863 if (udc->gadget.speed == USB_SPEED_UNKNOWN)
864 driver = NULL;
865 udc->gadget.speed = USB_SPEED_UNKNOWN;
866
867 for (i = 0; i < NUM_ENDPOINTS; i++) {
868 struct at91_ep *ep = &udc->ep[i];
869 ep->stopped = 1;
870 nuke(ep, -ESHUTDOWN);
871 }
872 if (driver)
873 driver->disconnect(&udc->gadget);
874
875 udc_reinit(udc);
876}
877
878static void clk_on(struct at91_udc *udc)
879{
880 if (udc->clocked)
881 return;
882 udc->clocked = 1;
883 clk_enable(udc->iclk);
884 clk_enable(udc->fclk);
885}
886
887static void clk_off(struct at91_udc *udc)
888{
889 if (!udc->clocked)
890 return;
891 udc->clocked = 0;
892 udc->gadget.speed = USB_SPEED_UNKNOWN;
893 clk_disable(udc->iclk);
894 clk_disable(udc->fclk);
895}
896
897/*
898 * activate/deactivate link with host; minimize power usage for
899 * inactive links by cutting clocks and transceiver power.
900 */
901static void pullup(struct at91_udc *udc, int is_on)
902{
903 if (!udc->enabled || !udc->vbus)
904 is_on = 0;
905 DBG("%sactive\n", is_on ? "" : "in");
906 if (is_on) {
907 clk_on(udc);
908 at91_udp_write(AT91_UDP_TXVC, 0);
909 at91_set_gpio_value(udc->board.pullup_pin, 1);
910 } else {
911 stop_activity(udc);
912 at91_udp_write(AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
913 at91_set_gpio_value(udc->board.pullup_pin, 0);
914 clk_off(udc);
915
916 // REVISIT: with transceiver disabled, will D- float
917 // so that a host would falsely detect a device?
918 }
919}
920
921/* vbus is here! turn everything on that's ready */
922static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
923{
924 struct at91_udc *udc = to_udc(gadget);
925 unsigned long flags;
926
927 // VDBG("vbus %s\n", is_active ? "on" : "off");
928 local_irq_save(flags);
929 udc->vbus = (is_active != 0);
930 pullup(udc, is_active);
931 local_irq_restore(flags);
932 return 0;
933}
934
935static int at91_pullup(struct usb_gadget *gadget, int is_on)
936{
937 struct at91_udc *udc = to_udc(gadget);
938 unsigned long flags;
939
940 local_irq_save(flags);
941 udc->enabled = is_on = !!is_on;
942 pullup(udc, is_on);
943 local_irq_restore(flags);
944 return 0;
945}
946
947static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
948{
949 struct at91_udc *udc = to_udc(gadget);
950 unsigned long flags;
951
952 local_irq_save(flags);
953 udc->selfpowered = (is_on != 0);
954 local_irq_restore(flags);
955 return 0;
956}
957
958static const struct usb_gadget_ops at91_udc_ops = {
959 .get_frame = at91_get_frame,
960 .wakeup = at91_wakeup,
961 .set_selfpowered = at91_set_selfpowered,
962 .vbus_session = at91_vbus_session,
963 .pullup = at91_pullup,
964
965 /*
966 * VBUS-powered devices may also also want to support bigger
967 * power budgets after an appropriate SET_CONFIGURATION.
968 */
969 // .vbus_power = at91_vbus_power,
970};
971
972/*-------------------------------------------------------------------------*/
973
974static int handle_ep(struct at91_ep *ep)
975{
976 struct at91_request *req;
977 u32 __iomem *creg = ep->creg;
978 u32 csr = __raw_readl(creg);
979
980 if (!list_empty(&ep->queue))
981 req = list_entry(ep->queue.next,
982 struct at91_request, queue);
983 else
984 req = NULL;
985
986 if (ep->is_in) {
987 if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
988 csr |= CLR_FX;
989 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
990 __raw_writel(csr, creg);
991 }
992 if (req)
993 return write_fifo(ep, req);
994
995 } else {
996 if (csr & AT91_UDP_STALLSENT) {
997 /* STALLSENT bit == ISOERR */
998 if (ep->is_iso && req)
999 req->req.status = -EILSEQ;
1000 csr |= CLR_FX;
1001 csr &= ~(SET_FX | AT91_UDP_STALLSENT);
1002 __raw_writel(csr, creg);
1003 csr = __raw_readl(creg);
1004 }
1005 if (req && (csr & RX_DATA_READY))
1006 return read_fifo(ep, req);
1007 }
1008 return 0;
1009}
1010
1011union setup {
1012 u8 raw[8];
1013 struct usb_ctrlrequest r;
1014};
1015
1016static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
1017{
1018 u32 __iomem *creg = ep->creg;
1019 u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
1020 unsigned rxcount, i = 0;
1021 u32 tmp;
1022 union setup pkt;
1023 int status = 0;
1024
1025 /* read and ack SETUP; hard-fail for bogus packets */
1026 rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
1027 if (likely(rxcount == 8)) {
1028 while (rxcount--)
1029 pkt.raw[i++] = __raw_readb(dreg);
1030 if (pkt.r.bRequestType & USB_DIR_IN) {
1031 csr |= AT91_UDP_DIR;
1032 ep->is_in = 1;
1033 } else {
1034 csr &= ~AT91_UDP_DIR;
1035 ep->is_in = 0;
1036 }
1037 } else {
1038 // REVISIT this happens sometimes under load; why??
1039 ERR("SETUP len %d, csr %08x\n", rxcount, csr);
1040 status = -EINVAL;
1041 }
1042 csr |= CLR_FX;
1043 csr &= ~(SET_FX | AT91_UDP_RXSETUP);
1044 __raw_writel(csr, creg);
1045 udc->wait_for_addr_ack = 0;
1046 udc->wait_for_config_ack = 0;
1047 ep->stopped = 0;
1048 if (unlikely(status != 0))
1049 goto stall;
1050
1051#define w_index le16_to_cpu(pkt.r.wIndex)
1052#define w_value le16_to_cpu(pkt.r.wValue)
1053#define w_length le16_to_cpu(pkt.r.wLength)
1054
1055 VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
1056 pkt.r.bRequestType, pkt.r.bRequest,
1057 w_value, w_index, w_length);
1058
1059 /*
1060 * A few standard requests get handled here, ones that touch
1061 * hardware ... notably for device and endpoint features.
1062 */
1063 udc->req_pending = 1;
1064 csr = __raw_readl(creg);
1065 csr |= CLR_FX;
1066 csr &= ~SET_FX;
1067 switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {
1068
1069 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1070 | USB_REQ_SET_ADDRESS:
1071 __raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
1072 udc->addr = w_value;
1073 udc->wait_for_addr_ack = 1;
1074 udc->req_pending = 0;
1075 /* FADDR is set later, when we ack host STATUS */
1076 return;
1077
1078 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1079 | USB_REQ_SET_CONFIGURATION:
1080 tmp = at91_udp_read(AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1081 if (pkt.r.wValue)
1082 udc->wait_for_config_ack = (tmp == 0);
1083 else
1084 udc->wait_for_config_ack = (tmp != 0);
1085 if (udc->wait_for_config_ack)
1086 VDBG("wait for config\n");
1087 /* CONFG is toggled later, if gadget driver succeeds */
1088 break;
1089
1090 /*
1091 * Hosts may set or clear remote wakeup status, and
1092 * devices may report they're VBUS powered.
1093 */
1094 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1095 | USB_REQ_GET_STATUS:
1096 tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1097 if (at91_udp_read(AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1098 tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
1099 PACKET("get device status\n");
1100 __raw_writeb(tmp, dreg);
1101 __raw_writeb(0, dreg);
1102 goto write_in;
1103 /* then STATUS starts later, automatically */
1104 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1105 | USB_REQ_SET_FEATURE:
1106 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1107 goto stall;
1108 tmp = at91_udp_read(AT91_UDP_GLB_STAT);
1109 tmp |= AT91_UDP_ESR;
1110 at91_udp_write(AT91_UDP_GLB_STAT, tmp);
1111 goto succeed;
1112 case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
1113 | USB_REQ_CLEAR_FEATURE:
1114 if (w_value != USB_DEVICE_REMOTE_WAKEUP)
1115 goto stall;
1116 tmp = at91_udp_read(AT91_UDP_GLB_STAT);
1117 tmp &= ~AT91_UDP_ESR;
1118 at91_udp_write(AT91_UDP_GLB_STAT, tmp);
1119 goto succeed;
1120
1121 /*
1122 * Interfaces have no feature settings; this is pretty useless.
1123 * we won't even insist the interface exists...
1124 */
1125 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1126 | USB_REQ_GET_STATUS:
1127 PACKET("get interface status\n");
1128 __raw_writeb(0, dreg);
1129 __raw_writeb(0, dreg);
1130 goto write_in;
1131 /* then STATUS starts later, automatically */
1132 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1133 | USB_REQ_SET_FEATURE:
1134 case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
1135 | USB_REQ_CLEAR_FEATURE:
1136 goto stall;
1137
1138 /*
1139 * Hosts may clear bulk/intr endpoint halt after the gadget
1140 * driver sets it (not widely used); or set it (for testing)
1141 */
1142 case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1143 | USB_REQ_GET_STATUS:
1144 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1145 ep = &udc->ep[tmp];
1146 if (tmp > NUM_ENDPOINTS || (tmp && !ep->desc))
1147 goto stall;
1148
1149 if (tmp) {
1150 if ((w_index & USB_DIR_IN)) {
1151 if (!ep->is_in)
1152 goto stall;
1153 } else if (ep->is_in)
1154 goto stall;
1155 }
1156 PACKET("get %s status\n", ep->ep.name);
1157 if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
1158 tmp = (1 << USB_ENDPOINT_HALT);
1159 else
1160 tmp = 0;
1161 __raw_writeb(tmp, dreg);
1162 __raw_writeb(0, dreg);
1163 goto write_in;
1164 /* then STATUS starts later, automatically */
1165 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1166 | USB_REQ_SET_FEATURE:
1167 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1168 ep = &udc->ep[tmp];
1169 if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS)
1170 goto stall;
1171 if (!ep->desc || ep->is_iso)
1172 goto stall;
1173 if ((w_index & USB_DIR_IN)) {
1174 if (!ep->is_in)
1175 goto stall;
1176 } else if (ep->is_in)
1177 goto stall;
1178
1179 tmp = __raw_readl(ep->creg);
1180 tmp &= ~SET_FX;
1181 tmp |= CLR_FX | AT91_UDP_FORCESTALL;
1182 __raw_writel(tmp, ep->creg);
1183 goto succeed;
1184 case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
1185 | USB_REQ_CLEAR_FEATURE:
1186 tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
1187 ep = &udc->ep[tmp];
1188 if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS)
1189 goto stall;
1190 if (tmp == 0)
1191 goto succeed;
1192 if (!ep->desc || ep->is_iso)
1193 goto stall;
1194 if ((w_index & USB_DIR_IN)) {
1195 if (!ep->is_in)
1196 goto stall;
1197 } else if (ep->is_in)
1198 goto stall;
1199
1200 at91_udp_write(AT91_UDP_RST_EP, ep->int_mask);
1201 at91_udp_write(AT91_UDP_RST_EP, 0);
1202 tmp = __raw_readl(ep->creg);
1203 tmp |= CLR_FX;
1204 tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
1205 __raw_writel(tmp, ep->creg);
1206 if (!list_empty(&ep->queue))
1207 handle_ep(ep);
1208 goto succeed;
1209 }
1210
1211#undef w_value
1212#undef w_index
1213#undef w_length
1214
1215 /* pass request up to the gadget driver */
1216 status = udc->driver->setup(&udc->gadget, &pkt.r);
1217 if (status < 0) {
1218stall:
1219 VDBG("req %02x.%02x protocol STALL; stat %d\n",
1220 pkt.r.bRequestType, pkt.r.bRequest, status);
1221 csr |= AT91_UDP_FORCESTALL;
1222 __raw_writel(csr, creg);
1223 udc->req_pending = 0;
1224 }
1225 return;
1226
1227succeed:
1228 /* immediate successful (IN) STATUS after zero length DATA */
1229 PACKET("ep0 in/status\n");
1230write_in:
1231 csr |= AT91_UDP_TXPKTRDY;
1232 __raw_writel(csr, creg);
1233 udc->req_pending = 0;
1234 return;
1235}
1236
1237static void handle_ep0(struct at91_udc *udc)
1238{
1239 struct at91_ep *ep0 = &udc->ep[0];
1240 u32 __iomem *creg = ep0->creg;
1241 u32 csr = __raw_readl(creg);
1242 struct at91_request *req;
1243
1244 if (unlikely(csr & AT91_UDP_STALLSENT)) {
1245 nuke(ep0, -EPROTO);
1246 udc->req_pending = 0;
1247 csr |= CLR_FX;
1248 csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
1249 __raw_writel(csr, creg);
1250 VDBG("ep0 stalled\n");
1251 csr = __raw_readl(creg);
1252 }
1253 if (csr & AT91_UDP_RXSETUP) {
1254 nuke(ep0, 0);
1255 udc->req_pending = 0;
1256 handle_setup(udc, ep0, csr);
1257 return;
1258 }
1259
1260 if (list_empty(&ep0->queue))
1261 req = NULL;
1262 else
1263 req = list_entry(ep0->queue.next, struct at91_request, queue);
1264
1265 /* host ACKed an IN packet that we sent */
1266 if (csr & AT91_UDP_TXCOMP) {
1267 csr |= CLR_FX;
1268 csr &= ~(SET_FX | AT91_UDP_TXCOMP);
1269
1270 /* write more IN DATA? */
1271 if (req && ep0->is_in) {
1272 if (handle_ep(ep0))
1273 udc->req_pending = 0;
1274
1275 /*
1276 * Ack after:
1277 * - last IN DATA packet (including GET_STATUS)
1278 * - IN/STATUS for OUT DATA
1279 * - IN/STATUS for any zero-length DATA stage
1280 * except for the IN DATA case, the host should send
1281 * an OUT status later, which we'll ack.
1282 */
1283 } else {
1284 udc->req_pending = 0;
1285 __raw_writel(csr, creg);
1286
1287 /*
1288 * SET_ADDRESS takes effect only after the STATUS
1289 * (to the original address) gets acked.
1290 */
1291 if (udc->wait_for_addr_ack) {
1292 u32 tmp;
1293
1294 at91_udp_write(AT91_UDP_FADDR, AT91_UDP_FEN | udc->addr);
1295 tmp = at91_udp_read(AT91_UDP_GLB_STAT);
1296 tmp &= ~AT91_UDP_FADDEN;
1297 if (udc->addr)
1298 tmp |= AT91_UDP_FADDEN;
1299 at91_udp_write(AT91_UDP_GLB_STAT, tmp);
1300
1301 udc->wait_for_addr_ack = 0;
1302 VDBG("address %d\n", udc->addr);
1303 }
1304 }
1305 }
1306
1307 /* OUT packet arrived ... */
1308 else if (csr & AT91_UDP_RX_DATA_BK0) {
1309 csr |= CLR_FX;
1310 csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
1311
1312 /* OUT DATA stage */
1313 if (!ep0->is_in) {
1314 if (req) {
1315 if (handle_ep(ep0)) {
1316 /* send IN/STATUS */
1317 PACKET("ep0 in/status\n");
1318 csr = __raw_readl(creg);
1319 csr &= ~SET_FX;
1320 csr |= CLR_FX | AT91_UDP_TXPKTRDY;
1321 __raw_writel(csr, creg);
1322 udc->req_pending = 0;
1323 }
1324 } else if (udc->req_pending) {
1325 /*
1326 * AT91 hardware has a hard time with this
1327 * "deferred response" mode for control-OUT
1328 * transfers. (For control-IN it's fine.)
1329 *
1330 * The normal solution leaves OUT data in the
1331 * fifo until the gadget driver is ready.
1332 * We couldn't do that here without disabling
1333 * the IRQ that tells about SETUP packets,
1334 * e.g. when the host gets impatient...
1335 *
1336 * Working around it by copying into a buffer
1337 * would almost be a non-deferred response,
1338 * except that it wouldn't permit reliable
1339 * stalling of the request. Instead, demand
1340 * that gadget drivers not use this mode.
1341 */
1342 DBG("no control-OUT deferred responses!\n");
1343 __raw_writel(csr | AT91_UDP_FORCESTALL, creg);
1344 udc->req_pending = 0;
1345 }
1346
1347 /* STATUS stage for control-IN; ack. */
1348 } else {
1349 PACKET("ep0 out/status ACK\n");
1350 __raw_writel(csr, creg);
1351
1352 /* "early" status stage */
1353 if (req)
1354 done(ep0, req, 0);
1355 }
1356 }
1357}
1358
1359static irqreturn_t at91_udc_irq (int irq, void *_udc, struct pt_regs *r)
1360{
1361 struct at91_udc *udc = _udc;
1362 u32 rescans = 5;
1363
1364 while (rescans--) {
1365 u32 status = at91_udp_read(AT91_UDP_ISR);
1366
1367 status &= at91_udp_read(AT91_UDP_IMR);
1368 if (!status)
1369 break;
1370
1371 /* USB reset irq: not maskable */
1372 if (status & AT91_UDP_ENDBUSRES) {
1373 at91_udp_write(AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
1374 at91_udp_write(AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1375 /* Atmel code clears this irq twice */
1376 at91_udp_write(AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1377 at91_udp_write(AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1378 VDBG("end bus reset\n");
1379 udc->addr = 0;
1380 stop_activity(udc);
1381
1382 /* enable ep0 */
1383 at91_udp_write(AT91_UDP_CSR(0), AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1384 udc->gadget.speed = USB_SPEED_FULL;
1385 udc->suspended = 0;
1386 at91_udp_write(AT91_UDP_IER, AT91_UDP_EP(0));
1387
1388 /*
1389 * NOTE: this driver keeps clocks off unless the
1390 * USB host is present. That saves power, and also
1391 * eliminates IRQs (reset, resume, suspend) that can
1392 * otherwise flood from the controller. If your
1393 * board doesn't support VBUS detection, suspend and
1394 * resume irq logic may need more attention...
1395 */
1396
1397 /* host initiated suspend (3+ms bus idle) */
1398 } else if (status & AT91_UDP_RXSUSP) {
1399 at91_udp_write(AT91_UDP_IDR, AT91_UDP_RXSUSP);
1400 at91_udp_write(AT91_UDP_IER, AT91_UDP_RXRSM);
1401 at91_udp_write(AT91_UDP_ICR, AT91_UDP_RXSUSP);
1402 // VDBG("bus suspend\n");
1403 if (udc->suspended)
1404 continue;
1405 udc->suspended = 1;
1406
1407 /*
1408 * NOTE: when suspending a VBUS-powered device, the
1409 * gadget driver should switch into slow clock mode
1410 * and then into standby to avoid drawing more than
1411 * 500uA power (2500uA for some high-power configs).
1412 */
1413 if (udc->driver && udc->driver->suspend)
1414 udc->driver->suspend(&udc->gadget);
1415
1416 /* host initiated resume */
1417 } else if (status & AT91_UDP_RXRSM) {
1418 at91_udp_write(AT91_UDP_IDR, AT91_UDP_RXRSM);
1419 at91_udp_write(AT91_UDP_IER, AT91_UDP_RXSUSP);
1420 at91_udp_write(AT91_UDP_ICR, AT91_UDP_RXRSM);
1421 // VDBG("bus resume\n");
1422 if (!udc->suspended)
1423 continue;
1424 udc->suspended = 0;
1425
1426 /*
1427 * NOTE: for a VBUS-powered device, the gadget driver
1428 * would normally want to switch out of slow clock
1429 * mode into normal mode.
1430 */
1431 if (udc->driver && udc->driver->resume)
1432 udc->driver->resume(&udc->gadget);
1433
1434 /* endpoint IRQs are cleared by handling them */
1435 } else {
1436 int i;
1437 unsigned mask = 1;
1438 struct at91_ep *ep = &udc->ep[1];
1439
1440 if (status & mask)
1441 handle_ep0(udc);
1442 for (i = 1; i < NUM_ENDPOINTS; i++) {
1443 mask <<= 1;
1444 if (status & mask)
1445 handle_ep(ep);
1446 ep++;
1447 }
1448 }
1449 }
1450
1451 return IRQ_HANDLED;
1452}
1453
1454/*-------------------------------------------------------------------------*/
1455
1456static struct at91_udc controller = {
1457 .gadget = {
1458 .ops = &at91_udc_ops,
1459 .ep0 = &controller.ep[0].ep,
1460 .name = driver_name,
1461 .dev = {
1462 .bus_id = "gadget"
1463 }
1464 },
1465 .ep[0] = {
1466 .ep = {
1467 .name = ep0name,
1468 .ops = &at91_ep_ops,
1469 },
1470 .udc = &controller,
1471 .maxpacket = 8,
1472 .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(0)),
1473 .int_mask = 1 << 0,
1474 },
1475 .ep[1] = {
1476 .ep = {
1477 .name = "ep1",
1478 .ops = &at91_ep_ops,
1479 },
1480 .udc = &controller,
1481 .is_pingpong = 1,
1482 .maxpacket = 64,
1483 .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(1)),
1484 .int_mask = 1 << 1,
1485 },
1486 .ep[2] = {
1487 .ep = {
1488 .name = "ep2",
1489 .ops = &at91_ep_ops,
1490 },
1491 .udc = &controller,
1492 .is_pingpong = 1,
1493 .maxpacket = 64,
1494 .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(2)),
1495 .int_mask = 1 << 2,
1496 },
1497 .ep[3] = {
1498 .ep = {
1499 /* could actually do bulk too */
1500 .name = "ep3-int",
1501 .ops = &at91_ep_ops,
1502 },
1503 .udc = &controller,
1504 .maxpacket = 8,
1505 .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(3)),
1506 .int_mask = 1 << 3,
1507 },
1508 .ep[4] = {
1509 .ep = {
1510 .name = "ep4",
1511 .ops = &at91_ep_ops,
1512 },
1513 .udc = &controller,
1514 .is_pingpong = 1,
1515 .maxpacket = 256,
1516 .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(4)),
1517 .int_mask = 1 << 4,
1518 },
1519 .ep[5] = {
1520 .ep = {
1521 .name = "ep5",
1522 .ops = &at91_ep_ops,
1523 },
1524 .udc = &controller,
1525 .is_pingpong = 1,
1526 .maxpacket = 256,
1527 .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(5)),
1528 .int_mask = 1 << 5,
1529 },
1530 /* ep6 and ep7 are also reserved */
1531};
1532
1533static irqreturn_t at91_vbus_irq(int irq, void *_udc, struct pt_regs *r)
1534{
1535 struct at91_udc *udc = _udc;
1536 unsigned value;
1537
1538 /* vbus needs at least brief debouncing */
1539 udelay(10);
1540 value = at91_get_gpio_value(udc->board.vbus_pin);
1541 if (value != udc->vbus)
1542 at91_vbus_session(&udc->gadget, value);
1543
1544 return IRQ_HANDLED;
1545}
1546
1547int usb_gadget_register_driver (struct usb_gadget_driver *driver)
1548{
1549 struct at91_udc *udc = &controller;
1550 int retval;
1551
1552 if (!driver
1553 || driver->speed != USB_SPEED_FULL
1554 || !driver->bind
1555 || !driver->unbind
1556 || !driver->setup) {
1557 DBG("bad parameter.\n");
1558 return -EINVAL;
1559 }
1560
1561 if (udc->driver) {
1562 DBG("UDC already has a gadget driver\n");
1563 return -EBUSY;
1564 }
1565
1566 udc->driver = driver;
1567 udc->gadget.dev.driver = &driver->driver;
1568 udc->gadget.dev.driver_data = &driver->driver;
1569 udc->enabled = 1;
1570 udc->selfpowered = 1;
1571
1572 retval = driver->bind(&udc->gadget);
1573 if (retval) {
1574 DBG("driver->bind() returned %d\n", retval);
1575 udc->driver = NULL;
1576 return retval;
1577 }
1578
1579 local_irq_disable();
1580 pullup(udc, 1);
1581 local_irq_enable();
1582
1583 DBG("bound to %s\n", driver->driver.name);
1584 return 0;
1585}
1586EXPORT_SYMBOL (usb_gadget_register_driver);
1587
1588int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
1589{
1590 struct at91_udc *udc = &controller;
1591
1592 if (!driver || driver != udc->driver)
1593 return -EINVAL;
1594
1595 local_irq_disable();
1596 udc->enabled = 0;
1597 pullup(udc, 0);
1598 local_irq_enable();
1599
1600 driver->unbind(&udc->gadget);
1601 udc->driver = NULL;
1602
1603 DBG("unbound from %s\n", driver->driver.name);
1604 return 0;
1605}
1606EXPORT_SYMBOL (usb_gadget_unregister_driver);
1607
1608/*-------------------------------------------------------------------------*/
1609
1610static void at91udc_shutdown(struct platform_device *dev)
1611{
1612 /* force disconnect on reboot */
1613 pullup(platform_get_drvdata(dev), 0);
1614}
1615
1616static int __devinit at91udc_probe(struct platform_device *pdev)
1617{
1618 struct device *dev = &pdev->dev;
1619 struct at91_udc *udc;
1620 int retval;
1621
1622 if (!dev->platform_data) {
1623 /* small (so we copy it) but critical! */
1624 DBG("missing platform_data\n");
1625 return -ENODEV;
1626 }
1627
1628 if (!request_mem_region(AT91_BASE_UDP, SZ_16K, driver_name)) {
1629 DBG("someone's using UDC memory\n");
1630 return -EBUSY;
1631 }
1632
1633 /* init software state */
1634 udc = &controller;
1635 udc->gadget.dev.parent = dev;
1636 udc->board = *(struct at91_udc_data *) dev->platform_data;
1637 udc->pdev = pdev;
1638 udc_reinit(udc);
1639 udc->enabled = 0;
1640
1641 /* get interface and function clocks */
1642 udc->iclk = clk_get(dev, "udc_clk");
1643 udc->fclk = clk_get(dev, "udpck");
1644 if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
1645 DBG("clocks missing\n");
1646 return -ENODEV;
1647 }
1648
1649 retval = device_register(&udc->gadget.dev);
1650 if (retval < 0)
1651 goto fail0;
1652
1653 /* disable everything until there's a gadget driver and vbus */
1654 pullup(udc, 0);
1655
1656 /* request UDC and maybe VBUS irqs */
1657 if (request_irq(AT91_ID_UDP, at91_udc_irq, SA_INTERRUPT, driver_name, udc)) {
1658 DBG("request irq %d failed\n", AT91_ID_UDP);
1659 retval = -EBUSY;
1660 goto fail1;
1661 }
1662 if (udc->board.vbus_pin > 0) {
1663 if (request_irq(udc->board.vbus_pin, at91_vbus_irq, SA_INTERRUPT, driver_name, udc)) {
1664 DBG("request vbus irq %d failed\n", udc->board.vbus_pin);
1665 free_irq(AT91_ID_UDP, udc);
1666 retval = -EBUSY;
1667 goto fail1;
1668 }
1669 } else {
1670 DBG("no VBUS detection, assuming always-on\n");
1671 udc->vbus = 1;
1672 }
1673 dev_set_drvdata(dev, udc);
1674 create_debug_file(udc);
1675
1676 INFO("%s version %s\n", driver_name, DRIVER_VERSION);
1677 return 0;
1678
1679fail1:
1680 device_unregister(&udc->gadget.dev);
1681fail0:
1682 release_mem_region(AT91_VA_BASE_UDP, SZ_16K);
1683 DBG("%s probe failed, %d\n", driver_name, retval);
1684 return retval;
1685}
1686
1687static int __devexit at91udc_remove(struct platform_device *dev)
1688{
1689 struct at91_udc *udc = platform_get_drvdata(dev);
1690
1691 DBG("remove\n");
1692
1693 pullup(udc, 0);
1694
1695 if (udc->driver != 0)
1696 usb_gadget_unregister_driver(udc->driver);
1697
1698 remove_debug_file(udc);
1699 if (udc->board.vbus_pin > 0)
1700 free_irq(udc->board.vbus_pin, udc);
1701 free_irq(AT91_ID_UDP, udc);
1702 device_unregister(&udc->gadget.dev);
1703 release_mem_region(AT91_BASE_UDP, SZ_16K);
1704
1705 clk_put(udc->iclk);
1706 clk_put(udc->fclk);
1707
1708 return 0;
1709}
1710
1711#ifdef CONFIG_PM
1712static int at91udc_suspend(struct platform_device *dev, u32 state, u32 level)
1713{
1714 struct at91_udc *udc = platform_get_drvdata(dev);
1715
1716 /*
1717 * The "safe" suspend transitions are opportunistic ... e.g. when
1718 * the USB link is suspended (48MHz clock autogated off), or when
1719 * it's disconnected (programmatically gated off, elsewhere).
1720 * Then we can suspend, and the chip can enter slow clock mode.
1721 *
1722 * The problem case is some component (user mode?) suspending this
1723 * device while it's active, with the 48 MHz clock in use. There
1724 * are two basic approaches: (a) veto suspend levels involving slow
1725 * clock mode, (b) disconnect, so 48 MHz will no longer be in use
1726 * and we can enter slow clock mode. This uses (b) for now, since
1727 * it's simplest until AT91 PM exists and supports the other option.
1728 */
1729 if (udc->vbus && !udc->suspended)
1730 pullup(udc, 0);
1731 return 0;
1732}
1733
1734static int at91udc_resume(struct platform_device *dev, u32 level)
1735{
1736 struct at91_udc *udc = platform_get_drvdata(dev);
1737
1738 /* maybe reconnect to host; if so, clocks on */
1739 pullup(udc, 1);
1740 return 0;
1741}
1742#else
1743#define at91udc_suspend NULL
1744#define at91udc_resume NULL
1745#endif
1746
1747static struct platform_driver at91_udc = {
1748 .probe = at91udc_probe,
1749 .remove = __devexit_p(at91udc_remove),
1750 .shutdown = at91udc_shutdown,
1751 .suspend = at91udc_suspend,
1752 .resume = at91udc_resume,
1753 .driver = {
1754 .name = (char *) driver_name,
1755 .owner = THIS_MODULE,
1756 },
1757};
1758
1759static int __devinit udc_init_module(void)
1760{
1761 return platform_driver_register(&at91_udc);
1762}
1763module_init(udc_init_module);
1764
1765static void __devexit udc_exit_module(void)
1766{
1767 platform_driver_unregister(&at91_udc);
1768}
1769module_exit(udc_exit_module);
1770
1771MODULE_DESCRIPTION("AT91RM9200 udc driver");
1772MODULE_AUTHOR("Thomas Rathbone, David Brownell");
1773MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-16 13:10:28 -0500