at91_udc.c 46.8 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
/*
 * at91_udc -- driver for at91-series USB peripheral controller
 *
 * Copyright (C) 2004 by Thomas Rathbone
 * Copyright (C) 2005 by HP Labs
 * Copyright (C) 2005 by David Brownell
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA  02111-1307, USA.
 */

24
#undef	VERBOSE_DEBUG
25
26
27
28
29
30
31
32
33
34
35
36
37
38
#undef	PACKET_TRACE

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/clk.h>
39
#include <linux/usb/ch9.h>
40
#include <linux/usb/gadget.h>
41
42

#include <asm/byteorder.h>
43
#include <asm/hardware.h>
44
45
46
47
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/mach-types.h>
48
#include <asm/gpio.h>
49
50

#include <asm/arch/board.h>
Andrew Victor's avatar
Andrew Victor committed
51
52
#include <asm/arch/cpu.h>
#include <asm/arch/at91sam9261_matrix.h>
53
54
55
56
57
58

#include "at91_udc.h"


/*
 * This controller is simple and PIO-only.  It's used in many AT91-series
59
60
 * full speed USB controllers, including the at91rm9200 (arm920T, with MMU),
 * at91sam926x (arm926ejs, with MMU), and several no-mmu versions.
61
62
63
 *
 * This driver expects the board has been wired with two GPIOs suppporting
 * a VBUS sensing IRQ, and a D+ pullup.  (They may be omitted, but the
64
65
66
 * testing hasn't covered such cases.)
 *
 * The pullup is most important (so it's integrated on sam926x parts).  It
67
 * provides software control over whether the host enumerates the device.
68
 *
69
70
 * The VBUS sensing helps during enumeration, and allows both USB clocks
 * (and the transceiver) to stay gated off until they're necessary, saving
71
72
 * power.  During USB suspend, the 48 MHz clock is gated off in hardware;
 * it may also be gated off by software during some Linux sleep states.
73
74
 */

75
#define	DRIVER_VERSION	"3 May 2006"
76
77
78
79
80

static const char driver_name [] = "at91_udc";
static const char ep0name[] = "ep0";


81
82
83
84
#define at91_udp_read(dev, reg) \
	__raw_readl((dev)->udp_baseaddr + (reg))
#define at91_udp_write(dev, reg, val) \
	__raw_writel((val), (dev)->udp_baseaddr + (reg))
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195

/*-------------------------------------------------------------------------*/

#ifdef CONFIG_USB_GADGET_DEBUG_FILES

#include <linux/seq_file.h>

static const char debug_filename[] = "driver/udc";

#define FOURBITS "%s%s%s%s"
#define EIGHTBITS FOURBITS FOURBITS

static void proc_ep_show(struct seq_file *s, struct at91_ep *ep)
{
	static char		*types[] = {
		"control", "out-iso", "out-bulk", "out-int",
		"BOGUS",   "in-iso",  "in-bulk",  "in-int"};

	u32			csr;
	struct at91_request	*req;
	unsigned long	flags;

	local_irq_save(flags);

	csr = __raw_readl(ep->creg);

	/* NOTE:  not collecting per-endpoint irq statistics... */

	seq_printf(s, "\n");
	seq_printf(s, "%s, maxpacket %d %s%s %s%s\n",
			ep->ep.name, ep->ep.maxpacket,
			ep->is_in ? "in" : "out",
			ep->is_iso ? " iso" : "",
			ep->is_pingpong
				? (ep->fifo_bank ? "pong" : "ping")
				: "",
			ep->stopped ? " stopped" : "");
	seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n",
		csr,
		(csr & 0x07ff0000) >> 16,
		(csr & (1 << 15)) ? "enabled" : "disabled",
		(csr & (1 << 11)) ? "DATA1" : "DATA0",
		types[(csr & 0x700) >> 8],

		/* iff type is control then print current direction */
		(!(csr & 0x700))
			? ((csr & (1 << 7)) ? " IN" : " OUT")
			: "",
		(csr & (1 << 6)) ? " rxdatabk1" : "",
		(csr & (1 << 5)) ? " forcestall" : "",
		(csr & (1 << 4)) ? " txpktrdy" : "",

		(csr & (1 << 3)) ? " stallsent" : "",
		(csr & (1 << 2)) ? " rxsetup" : "",
		(csr & (1 << 1)) ? " rxdatabk0" : "",
		(csr & (1 << 0)) ? " txcomp" : "");
	if (list_empty (&ep->queue))
		seq_printf(s, "\t(queue empty)\n");

	else list_for_each_entry (req, &ep->queue, queue) {
		unsigned	length = req->req.actual;

		seq_printf(s, "\treq %p len %d/%d buf %p\n",
				&req->req, length,
				req->req.length, req->req.buf);
	}
	local_irq_restore(flags);
}

static void proc_irq_show(struct seq_file *s, const char *label, u32 mask)
{
	int i;

	seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask,
		(mask & (1 << 13)) ? " wakeup" : "",
		(mask & (1 << 12)) ? " endbusres" : "",

		(mask & (1 << 11)) ? " sofint" : "",
		(mask & (1 << 10)) ? " extrsm" : "",
		(mask & (1 << 9)) ? " rxrsm" : "",
		(mask & (1 << 8)) ? " rxsusp" : "");
	for (i = 0; i < 8; i++) {
		if (mask & (1 << i))
			seq_printf(s, " ep%d", i);
	}
	seq_printf(s, "\n");
}

static int proc_udc_show(struct seq_file *s, void *unused)
{
	struct at91_udc	*udc = s->private;
	struct at91_ep	*ep;
	u32		tmp;

	seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION);

	seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n",
		udc->vbus ? "present" : "off",
		udc->enabled
			? (udc->vbus ? "active" : "enabled")
			: "disabled",
		udc->selfpowered ? "self" : "VBUS",
		udc->suspended ? ", suspended" : "",
		udc->driver ? udc->driver->driver.name : "(none)");

	/* don't access registers when interface isn't clocked */
	if (!udc->clocked) {
		seq_printf(s, "(not clocked)\n");
		return 0;
	}

196
	tmp = at91_udp_read(udc, AT91_UDP_FRM_NUM);
197
198
199
200
201
	seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp,
		(tmp & AT91_UDP_FRM_OK) ? " ok" : "",
		(tmp & AT91_UDP_FRM_ERR) ? " err" : "",
		(tmp & AT91_UDP_NUM));

202
	tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
203
204
205
206
207
208
209
	seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp,
		(tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "",
		(tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "",
		(tmp & AT91_UDP_ESR) ? " esr" : "",
		(tmp & AT91_UDP_CONFG) ? " confg" : "",
		(tmp & AT91_UDP_FADDEN) ? " fadden" : "");

210
	tmp = at91_udp_read(udc, AT91_UDP_FADDR);
211
212
213
214
	seq_printf(s, "faddr   %03x:%s fadd=%d\n", tmp,
		(tmp & AT91_UDP_FEN) ? " fen" : "",
		(tmp & AT91_UDP_FADD));

215
216
	proc_irq_show(s, "imr   ", at91_udp_read(udc, AT91_UDP_IMR));
	proc_irq_show(s, "isr   ", at91_udp_read(udc, AT91_UDP_ISR));
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232

	if (udc->enabled && udc->vbus) {
		proc_ep_show(s, &udc->ep[0]);
		list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
			if (ep->desc)
				proc_ep_show(s, ep);
		}
	}
	return 0;
}

static int proc_udc_open(struct inode *inode, struct file *file)
{
	return single_open(file, proc_udc_show, PDE(inode)->data);
}

233
static const struct file_operations proc_ops = {
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
	.open		= proc_udc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static void create_debug_file(struct at91_udc *udc)
{
	struct proc_dir_entry *pde;

	pde = create_proc_entry (debug_filename, 0, NULL);
	udc->pde = pde;
	if (pde == NULL)
		return;

	pde->proc_fops = &proc_ops;
	pde->data = udc;
}

static void remove_debug_file(struct at91_udc *udc)
{
	if (udc->pde)
		remove_proc_entry(debug_filename, NULL);
}

#else

static inline void create_debug_file(struct at91_udc *udc) {}
static inline void remove_debug_file(struct at91_udc *udc) {}

#endif


/*-------------------------------------------------------------------------*/

static void done(struct at91_ep *ep, struct at91_request *req, int status)
{
	unsigned	stopped = ep->stopped;
272
	struct at91_udc	*udc = ep->udc;
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287

	list_del_init(&req->queue);
	if (req->req.status == -EINPROGRESS)
		req->req.status = status;
	else
		status = req->req.status;
	if (status && status != -ESHUTDOWN)
		VDBG("%s done %p, status %d\n", ep->ep.name, req, status);

	ep->stopped = 1;
	req->req.complete(&ep->ep, &req->req);
	ep->stopped = stopped;

	/* ep0 is always ready; other endpoints need a non-empty queue */
	if (list_empty(&ep->queue) && ep->int_mask != (1 << 0))
288
		at91_udp_write(udc, AT91_UDP_IDR, ep->int_mask);
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
}

/*-------------------------------------------------------------------------*/

/* bits indicating OUT fifo has data ready */
#define	RX_DATA_READY	(AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1)

/*
 * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write
 * back most of the value you just read (because of side effects, including
 * bits that may change after reading and before writing).
 *
 * Except when changing a specific bit, always write values which:
 *  - clear SET_FX bits (setting them could change something)
 *  - set CLR_FX bits (clearing them could change something)
 *
 * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE
 * that shouldn't normally be changed.
307
308
309
310
311
 *
 * NOTE at91sam9260 docs mention synch between UDPCK and MCK clock domains,
 * implying a need to wait for one write to complete (test relevant bits)
 * before starting the next write.  This shouldn't be an issue given how
 * infrequently we write, except maybe for write-then-read idioms.
312
313
 */
#define	SET_FX	(AT91_UDP_TXPKTRDY)
314
315
#define	CLR_FX	(RX_DATA_READY | AT91_UDP_RXSETUP \
		| AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391

/* pull OUT packet data from the endpoint's fifo */
static int read_fifo (struct at91_ep *ep, struct at91_request *req)
{
	u32 __iomem	*creg = ep->creg;
	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
	u32		csr;
	u8		*buf;
	unsigned int	count, bufferspace, is_done;

	buf = req->req.buf + req->req.actual;
	bufferspace = req->req.length - req->req.actual;

	/*
	 * there might be nothing to read if ep_queue() calls us,
	 * or if we already emptied both pingpong buffers
	 */
rescan:
	csr = __raw_readl(creg);
	if ((csr & RX_DATA_READY) == 0)
		return 0;

	count = (csr & AT91_UDP_RXBYTECNT) >> 16;
	if (count > ep->ep.maxpacket)
		count = ep->ep.maxpacket;
	if (count > bufferspace) {
		DBG("%s buffer overflow\n", ep->ep.name);
		req->req.status = -EOVERFLOW;
		count = bufferspace;
	}
	__raw_readsb(dreg, buf, count);

	/* release and swap pingpong mem bank */
	csr |= CLR_FX;
	if (ep->is_pingpong) {
		if (ep->fifo_bank == 0) {
			csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
			ep->fifo_bank = 1;
		} else {
			csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1);
			ep->fifo_bank = 0;
		}
	} else
		csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);
	__raw_writel(csr, creg);

	req->req.actual += count;
	is_done = (count < ep->ep.maxpacket);
	if (count == bufferspace)
		is_done = 1;

	PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count,
			is_done ? " (done)" : "");

	/*
	 * avoid extra trips through IRQ logic for packets already in
	 * the fifo ... maybe preventing an extra (expensive) OUT-NAK
	 */
	if (is_done)
		done(ep, req, 0);
	else if (ep->is_pingpong) {
		bufferspace -= count;
		buf += count;
		goto rescan;
	}

	return is_done;
}

/* load fifo for an IN packet */
static int write_fifo(struct at91_ep *ep, struct at91_request *req)
{
	u32 __iomem	*creg = ep->creg;
	u32		csr = __raw_readl(creg);
	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
	unsigned	total, count, is_last;
392
	u8		*buf;
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416

	/*
	 * TODO: allow for writing two packets to the fifo ... that'll
	 * reduce the amount of IN-NAKing, but probably won't affect
	 * throughput much.  (Unlike preventing OUT-NAKing!)
	 */

	/*
	 * If ep_queue() calls us, the queue is empty and possibly in
	 * odd states like TXCOMP not yet cleared (we do it, saving at
	 * least one IRQ) or the fifo not yet being free.  Those aren't
	 * issues normally (IRQ handler fast path).
	 */
	if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) {
		if (csr & AT91_UDP_TXCOMP) {
			csr |= CLR_FX;
			csr &= ~(SET_FX | AT91_UDP_TXCOMP);
			__raw_writel(csr, creg);
			csr = __raw_readl(creg);
		}
		if (csr & AT91_UDP_TXPKTRDY)
			return 0;
	}

417
418
	buf = req->req.buf + req->req.actual;
	prefetch(buf);
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
	total = req->req.length - req->req.actual;
	if (ep->ep.maxpacket < total) {
		count = ep->ep.maxpacket;
		is_last = 0;
	} else {
		count = total;
		is_last = (count < ep->ep.maxpacket) || !req->req.zero;
	}

	/*
	 * Write the packet, maybe it's a ZLP.
	 *
	 * NOTE:  incrementing req->actual before we receive the ACK means
	 * gadget driver IN bytecounts can be wrong in fault cases.  That's
	 * fixable with PIO drivers like this one (save "count" here, and
	 * do the increment later on TX irq), but not for most DMA hardware.
	 *
	 * So all gadget drivers must accept that potential error.  Some
	 * hardware supports precise fifo status reporting, letting them
	 * recover when the actual bytecount matters (e.g. for USB Test
	 * and Measurement Class devices).
	 */
441
	__raw_writesb(dreg, buf, count);
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
	csr &= ~SET_FX;
	csr |= CLR_FX | AT91_UDP_TXPKTRDY;
	__raw_writel(csr, creg);
	req->req.actual += count;

	PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count,
			is_last ? " (done)" : "");
	if (is_last)
		done(ep, req, 0);
	return is_last;
}

static void nuke(struct at91_ep *ep, int status)
{
	struct at91_request *req;

	// terminer chaque requete dans la queue
	ep->stopped = 1;
	if (list_empty(&ep->queue))
		return;

	VDBG("%s %s\n", __FUNCTION__, ep->ep.name);
	while (!list_empty(&ep->queue)) {
		req = list_entry(ep->queue.next, struct at91_request, queue);
		done(ep, req, status);
	}
}

/*-------------------------------------------------------------------------*/

472
473
static int at91_ep_enable(struct usb_ep *_ep,
				const struct usb_endpoint_descriptor *desc)
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
{
	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
	struct at91_udc	*dev = ep->udc;
	u16		maxpacket;
	u32		tmp;
	unsigned long	flags;

	if (!_ep || !ep
			|| !desc || ep->desc
			|| _ep->name == ep0name
			|| desc->bDescriptorType != USB_DT_ENDPOINT
			|| (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0
			|| maxpacket > ep->maxpacket) {
		DBG("bad ep or descriptor\n");
		return -EINVAL;
	}

	if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
		DBG("bogus device state\n");
		return -ESHUTDOWN;
	}

	tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
	switch (tmp) {
	case USB_ENDPOINT_XFER_CONTROL:
		DBG("only one control endpoint\n");
		return -EINVAL;
	case USB_ENDPOINT_XFER_INT:
		if (maxpacket > 64)
			goto bogus_max;
		break;
	case USB_ENDPOINT_XFER_BULK:
		switch (maxpacket) {
		case 8:
		case 16:
		case 32:
		case 64:
			goto ok;
		}
bogus_max:
		DBG("bogus maxpacket %d\n", maxpacket);
		return -EINVAL;
	case USB_ENDPOINT_XFER_ISOC:
		if (!ep->is_pingpong) {
			DBG("iso requires double buffering\n");
			return -EINVAL;
		}
		break;
	}

ok:
	local_irq_save(flags);

	/* initialize endpoint to match this descriptor */
	ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
	ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
	ep->stopped = 0;
	if (ep->is_in)
		tmp |= 0x04;
	tmp <<= 8;
	tmp |= AT91_UDP_EPEDS;
	__raw_writel(tmp, ep->creg);

	ep->desc = desc;
	ep->ep.maxpacket = maxpacket;

	/*
	 * reset/init endpoint fifo.  NOTE:  leaves fifo_bank alone,
	 * since endpoint resets don't reset hw pingpong state.
	 */
544
545
	at91_udp_write(dev, AT91_UDP_RST_EP, ep->int_mask);
	at91_udp_write(dev, AT91_UDP_RST_EP, 0);
546
547
548
549
550
551
552
553

	local_irq_restore(flags);
	return 0;
}

static int at91_ep_disable (struct usb_ep * _ep)
{
	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
554
	struct at91_udc	*udc = ep->udc;
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
	unsigned long	flags;

	if (ep == &ep->udc->ep[0])
		return -EINVAL;

	local_irq_save(flags);

	nuke(ep, -ESHUTDOWN);

	/* restore the endpoint's pristine config */
	ep->desc = NULL;
	ep->ep.maxpacket = ep->maxpacket;

	/* reset fifos and endpoint */
	if (ep->udc->clocked) {
570
571
		at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
		at91_udp_write(udc, AT91_UDP_RST_EP, 0);
572
573
574
575
576
577
578
579
580
581
582
583
		__raw_writel(0, ep->creg);
	}

	local_irq_restore(flags);
	return 0;
}

/*
 * this is a PIO-only driver, so there's nothing
 * interesting for request or buffer allocation.
 */

584
static struct usb_request *
585
at91_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
586
587
588
{
	struct at91_request *req;

589
	req = kzalloc(sizeof (struct at91_request), gfp_flags);
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
	if (!req)
		return NULL;

	INIT_LIST_HEAD(&req->queue);
	return &req->req;
}

static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
{
	struct at91_request *req;

	req = container_of(_req, struct at91_request, req);
	BUG_ON(!list_empty(&req->queue));
	kfree(req);
}

static int at91_ep_queue(struct usb_ep *_ep,
			struct usb_request *_req, gfp_t gfp_flags)
{
	struct at91_request	*req;
	struct at91_ep		*ep;
	struct at91_udc		*dev;
	int			status;
	unsigned long		flags;

	req = container_of(_req, struct at91_request, req);
	ep = container_of(_ep, struct at91_ep, ep);

	if (!_req || !_req->complete
			|| !_req->buf || !list_empty(&req->queue)) {
		DBG("invalid request\n");
		return -EINVAL;
	}

	if (!_ep || (!ep->desc && ep->ep.name != ep0name)) {
		DBG("invalid ep\n");
		return -EINVAL;
	}

	dev = ep->udc;

	if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
		DBG("invalid device\n");
		return -EINVAL;
	}

	_req->status = -EINPROGRESS;
	_req->actual = 0;

	local_irq_save(flags);

	/* try to kickstart any empty and idle queue */
	if (list_empty(&ep->queue) && !ep->stopped) {
		int	is_ep0;

		/*
		 * If this control request has a non-empty DATA stage, this
		 * will start that stage.  It works just like a non-control
		 * request (until the status stage starts, maybe early).
		 *
		 * If the data stage is empty, then this starts a successful
		 * IN/STATUS stage.  (Unsuccessful ones use set_halt.)
		 */
		is_ep0 = (ep->ep.name == ep0name);
		if (is_ep0) {
			u32	tmp;

			if (!dev->req_pending) {
				status = -EINVAL;
				goto done;
			}

			/*
			 * defer changing CONFG until after the gadget driver
			 * reconfigures the endpoints.
			 */
			if (dev->wait_for_config_ack) {
667
				tmp = at91_udp_read(dev, AT91_UDP_GLB_STAT);
668
669
				tmp ^= AT91_UDP_CONFG;
				VDBG("toggle config\n");
670
				at91_udp_write(dev, AT91_UDP_GLB_STAT, tmp);
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
			}
			if (req->req.length == 0) {
ep0_in_status:
				PACKET("ep0 in/status\n");
				status = 0;
				tmp = __raw_readl(ep->creg);
				tmp &= ~SET_FX;
				tmp |= CLR_FX | AT91_UDP_TXPKTRDY;
				__raw_writel(tmp, ep->creg);
				dev->req_pending = 0;
				goto done;
			}
		}

		if (ep->is_in)
			status = write_fifo(ep, req);
		else {
			status = read_fifo(ep, req);

			/* IN/STATUS stage is otherwise triggered by irq */
			if (status && is_ep0)
				goto ep0_in_status;
		}
	} else
		status = 0;

	if (req && !status) {
		list_add_tail (&req->queue, &ep->queue);
699
		at91_udp_write(dev, AT91_UDP_IER, ep->int_mask);
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
	}
done:
	local_irq_restore(flags);
	return (status < 0) ? status : 0;
}

static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
	struct at91_ep	*ep;
	struct at91_request	*req;

	ep = container_of(_ep, struct at91_ep, ep);
	if (!_ep || ep->ep.name == ep0name)
		return -EINVAL;

	/* make sure it's actually queued on this endpoint */
	list_for_each_entry (req, &ep->queue, queue) {
		if (&req->req == _req)
			break;
	}
	if (&req->req != _req)
		return -EINVAL;

	done(ep, req, -ECONNRESET);
	return 0;
}

static int at91_ep_set_halt(struct usb_ep *_ep, int value)
{
	struct at91_ep	*ep = container_of(_ep, struct at91_ep, ep);
730
	struct at91_udc	*udc = ep->udc;
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
	u32 __iomem	*creg;
	u32		csr;
	unsigned long	flags;
	int		status = 0;

	if (!_ep || ep->is_iso || !ep->udc->clocked)
		return -EINVAL;

	creg = ep->creg;
	local_irq_save(flags);

	csr = __raw_readl(creg);

	/*
	 * fail with still-busy IN endpoints, ensuring correct sequencing
	 * of data tx then stall.  note that the fifo rx bytecount isn't
	 * completely accurate as a tx bytecount.
	 */
	if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0))
		status = -EAGAIN;
	else {
		csr |= CLR_FX;
		csr &= ~SET_FX;
		if (value) {
			csr |= AT91_UDP_FORCESTALL;
			VDBG("halt %s\n", ep->ep.name);
		} else {
758
759
			at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
			at91_udp_write(udc, AT91_UDP_RST_EP, 0);
760
761
762
763
764
765
766
767
768
			csr &= ~AT91_UDP_FORCESTALL;
		}
		__raw_writel(csr, creg);
	}

	local_irq_restore(flags);
	return status;
}

769
static const struct usb_ep_ops at91_ep_ops = {
770
771
772
773
774
775
776
777
778
779
780
781
782
783
	.enable		= at91_ep_enable,
	.disable	= at91_ep_disable,
	.alloc_request	= at91_ep_alloc_request,
	.free_request	= at91_ep_free_request,
	.queue		= at91_ep_queue,
	.dequeue	= at91_ep_dequeue,
	.set_halt	= at91_ep_set_halt,
	// there's only imprecise fifo status reporting
};

/*-------------------------------------------------------------------------*/

static int at91_get_frame(struct usb_gadget *gadget)
{
784
785
	struct at91_udc *udc = to_udc(gadget);

786
787
	if (!to_udc(gadget)->clocked)
		return -EINVAL;
788
	return at91_udp_read(udc, AT91_UDP_FRM_NUM) & AT91_UDP_NUM;
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
}

static int at91_wakeup(struct usb_gadget *gadget)
{
	struct at91_udc	*udc = to_udc(gadget);
	u32		glbstate;
	int		status = -EINVAL;
	unsigned long	flags;

	DBG("%s\n", __FUNCTION__ );
	local_irq_save(flags);

	if (!udc->clocked || !udc->suspended)
		goto done;

	/* NOTE:  some "early versions" handle ESR differently ... */

806
	glbstate = at91_udp_read(udc, AT91_UDP_GLB_STAT);
807
808
809
	if (!(glbstate & AT91_UDP_ESR))
		goto done;
	glbstate |= AT91_UDP_ESR;
810
	at91_udp_write(udc, AT91_UDP_GLB_STAT, glbstate);
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833

done:
	local_irq_restore(flags);
	return status;
}

/* reinit == restore inital software state */
static void udc_reinit(struct at91_udc *udc)
{
	u32 i;

	INIT_LIST_HEAD(&udc->gadget.ep_list);
	INIT_LIST_HEAD(&udc->gadget.ep0->ep_list);

	for (i = 0; i < NUM_ENDPOINTS; i++) {
		struct at91_ep *ep = &udc->ep[i];

		if (i != 0)
			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
		ep->desc = NULL;
		ep->stopped = 0;
		ep->fifo_bank = 0;
		ep->ep.maxpacket = ep->maxpacket;
834
		ep->creg = (void __iomem *) udc->udp_baseaddr + AT91_UDP_CSR(i);
835
836
837
838
839
840
841
842
843
844
845
846
847
		// initialiser une queue par endpoint
		INIT_LIST_HEAD(&ep->queue);
	}
}

static void stop_activity(struct at91_udc *udc)
{
	struct usb_gadget_driver *driver = udc->driver;
	int i;

	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
		driver = NULL;
	udc->gadget.speed = USB_SPEED_UNKNOWN;
848
	udc->suspended = 0;
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876

	for (i = 0; i < NUM_ENDPOINTS; i++) {
		struct at91_ep *ep = &udc->ep[i];
		ep->stopped = 1;
		nuke(ep, -ESHUTDOWN);
	}
	if (driver)
		driver->disconnect(&udc->gadget);

	udc_reinit(udc);
}

static void clk_on(struct at91_udc *udc)
{
	if (udc->clocked)
		return;
	udc->clocked = 1;
	clk_enable(udc->iclk);
	clk_enable(udc->fclk);
}

static void clk_off(struct at91_udc *udc)
{
	if (!udc->clocked)
		return;
	udc->clocked = 0;
	udc->gadget.speed = USB_SPEED_UNKNOWN;
	clk_disable(udc->fclk);
877
	clk_disable(udc->iclk);
878
879
880
881
882
883
884
885
}

/*
 * activate/deactivate link with host; minimize power usage for
 * inactive links by cutting clocks and transceiver power.
 */
static void pullup(struct at91_udc *udc, int is_on)
{
886
887
	int	active = !udc->board.pullup_active_low;

888
889
890
	if (!udc->enabled || !udc->vbus)
		is_on = 0;
	DBG("%sactive\n", is_on ? "" : "in");
891

892
893
	if (is_on) {
		clk_on(udc);
894
		at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
895
		at91_udp_write(udc, AT91_UDP_TXVC, 0);
Andrew Victor's avatar
Andrew Victor committed
896
		if (cpu_is_at91rm9200())
897
			gpio_set_value(udc->board.pullup_pin, active);
898
		else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
Andrew Victor's avatar
Andrew Victor committed
899
900
901
902
903
904
905
906
907
908
909
			u32	txvc = at91_udp_read(udc, AT91_UDP_TXVC);

			txvc |= AT91_UDP_TXVC_PUON;
			at91_udp_write(udc, AT91_UDP_TXVC, txvc);
		} else if (cpu_is_at91sam9261()) {
			u32	usbpucr;

			usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
			usbpucr |= AT91_MATRIX_USBPUCR_PUON;
			at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
		}
910
	} else {
911
		stop_activity(udc);
912
		at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
913
		at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
Andrew Victor's avatar
Andrew Victor committed
914
		if (cpu_is_at91rm9200())
915
			gpio_set_value(udc->board.pullup_pin, !active);
916
		else if (cpu_is_at91sam9260() || cpu_is_at91sam9263()) {
Andrew Victor's avatar
Andrew Victor committed
917
918
919
920
921
922
923
924
925
926
927
			u32	txvc = at91_udp_read(udc, AT91_UDP_TXVC);

			txvc &= ~AT91_UDP_TXVC_PUON;
			at91_udp_write(udc, AT91_UDP_TXVC, txvc);
		} else if (cpu_is_at91sam9261()) {
			u32	usbpucr;

			usbpucr = at91_sys_read(AT91_MATRIX_USBPUCR);
			usbpucr &= ~AT91_MATRIX_USBPUCR_PUON;
			at91_sys_write(AT91_MATRIX_USBPUCR, usbpucr);
		}
928
929
930
931
932
933
934
935
936
937
938
939
940
		clk_off(udc);
	}
}

/* vbus is here!  turn everything on that's ready */
static int at91_vbus_session(struct usb_gadget *gadget, int is_active)
{
	struct at91_udc	*udc = to_udc(gadget);
	unsigned long	flags;

	// VDBG("vbus %s\n", is_active ? "on" : "off");
	local_irq_save(flags);
	udc->vbus = (is_active != 0);
941
942
943
944
	if (udc->driver)
		pullup(udc, is_active);
	else
		pullup(udc, 0);
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
	local_irq_restore(flags);
	return 0;
}

static int at91_pullup(struct usb_gadget *gadget, int is_on)
{
	struct at91_udc	*udc = to_udc(gadget);
	unsigned long	flags;

	local_irq_save(flags);
	udc->enabled = is_on = !!is_on;
	pullup(udc, is_on);
	local_irq_restore(flags);
	return 0;
}

static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on)
{
	struct at91_udc	*udc = to_udc(gadget);
	unsigned long	flags;

	local_irq_save(flags);
	udc->selfpowered = (is_on != 0);
	local_irq_restore(flags);
	return 0;
}

static const struct usb_gadget_ops at91_udc_ops = {
	.get_frame		= at91_get_frame,
	.wakeup			= at91_wakeup,
	.set_selfpowered	= at91_set_selfpowered,
	.vbus_session		= at91_vbus_session,
	.pullup			= at91_pullup,

	/*
	 * VBUS-powered devices may also also want to support bigger
	 * power budgets after an appropriate SET_CONFIGURATION.
	 */
	// .vbus_power		= at91_vbus_power,
};

/*-------------------------------------------------------------------------*/

static int handle_ep(struct at91_ep *ep)
{
	struct at91_request	*req;
	u32 __iomem		*creg = ep->creg;
	u32			csr = __raw_readl(creg);

	if (!list_empty(&ep->queue))
		req = list_entry(ep->queue.next,
			struct at91_request, queue);
	else
		req = NULL;

	if (ep->is_in) {
		if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) {
			csr |= CLR_FX;
			csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP);
			__raw_writel(csr, creg);
		}
		if (req)
			return write_fifo(ep, req);

	} else {
		if (csr & AT91_UDP_STALLSENT) {
			/* STALLSENT bit == ISOERR */
			if (ep->is_iso && req)
				req->req.status = -EILSEQ;
			csr |= CLR_FX;
			csr &= ~(SET_FX | AT91_UDP_STALLSENT);
			__raw_writel(csr, creg);
			csr = __raw_readl(creg);
		}
		if (req && (csr & RX_DATA_READY))
			return read_fifo(ep, req);
	}
	return 0;
}

union setup {
	u8			raw[8];
	struct usb_ctrlrequest	r;
};

static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr)
{
	u32 __iomem	*creg = ep->creg;
	u8 __iomem	*dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
	unsigned	rxcount, i = 0;
	u32		tmp;
	union setup	pkt;
	int		status = 0;

	/* read and ack SETUP; hard-fail for bogus packets */
	rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16;
	if (likely(rxcount == 8)) {
		while (rxcount--)
			pkt.raw[i++] = __raw_readb(dreg);
		if (pkt.r.bRequestType & USB_DIR_IN) {
			csr |= AT91_UDP_DIR;
			ep->is_in = 1;
		} else {
			csr &= ~AT91_UDP_DIR;
			ep->is_in = 0;
		}
	} else {
		// REVISIT this happens sometimes under load; why??
		ERR("SETUP len %d, csr %08x\n", rxcount, csr);
		status = -EINVAL;
	}
	csr |= CLR_FX;
	csr &= ~(SET_FX | AT91_UDP_RXSETUP);
	__raw_writel(csr, creg);
	udc->wait_for_addr_ack = 0;
	udc->wait_for_config_ack = 0;
	ep->stopped = 0;
	if (unlikely(status != 0))
		goto stall;

#define w_index		le16_to_cpu(pkt.r.wIndex)
#define w_value		le16_to_cpu(pkt.r.wValue)
#define w_length	le16_to_cpu(pkt.r.wLength)

	VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n",
			pkt.r.bRequestType, pkt.r.bRequest,
			w_value, w_index, w_length);

	/*
	 * A few standard requests get handled here, ones that touch
	 * hardware ... notably for device and endpoint features.
	 */
	udc->req_pending = 1;
	csr = __raw_readl(creg);
	csr |= CLR_FX;
	csr &= ~SET_FX;
	switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) {

	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_SET_ADDRESS:
		__raw_writel(csr | AT91_UDP_TXPKTRDY, creg);
		udc->addr = w_value;
		udc->wait_for_addr_ack = 1;
		udc->req_pending = 0;
		/* FADDR is set later, when we ack host STATUS */
		return;

	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_SET_CONFIGURATION:
1094
		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_CONFG;
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
		if (pkt.r.wValue)
			udc->wait_for_config_ack = (tmp == 0);
		else
			udc->wait_for_config_ack = (tmp != 0);
		if (udc->wait_for_config_ack)
			VDBG("wait for config\n");
		/* CONFG is toggled later, if gadget driver succeeds */
		break;

	/*
	 * Hosts may set or clear remote wakeup status, and
	 * devices may report they're VBUS powered.
	 */
	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_GET_STATUS:
		tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED);
1111
		if (at91_udp_read(udc, AT91_UDP_GLB_STAT) & AT91_UDP_ESR)
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
			tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP);
		PACKET("get device status\n");
		__raw_writeb(tmp, dreg);
		__raw_writeb(0, dreg);
		goto write_in;
		/* then STATUS starts later, automatically */
	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_SET_FEATURE:
		if (w_value != USB_DEVICE_REMOTE_WAKEUP)
			goto stall;
1122
		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1123
		tmp |= AT91_UDP_ESR;
1124
		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1125
1126
1127
1128
1129
		goto succeed;
	case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8)
			| USB_REQ_CLEAR_FEATURE:
		if (w_value != USB_DEVICE_REMOTE_WAKEUP)
			goto stall;
1130
		tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1131
		tmp &= ~AT91_UDP_ESR;
1132
		at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
		goto succeed;

	/*
	 * Interfaces have no feature settings; this is pretty useless.
	 * we won't even insist the interface exists...
	 */
	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
			| USB_REQ_GET_STATUS:
		PACKET("get interface status\n");
		__raw_writeb(0, dreg);
		__raw_writeb(0, dreg);
		goto write_in;
		/* then STATUS starts later, automatically */
	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
			| USB_REQ_SET_FEATURE:
	case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8)
			| USB_REQ_CLEAR_FEATURE:
		goto stall;

	/*
	 * Hosts may clear bulk/intr endpoint halt after the gadget
	 * driver sets it (not widely used); or set it (for testing)
	 */
	case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
			| USB_REQ_GET_STATUS:
		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
		ep = &udc->ep[tmp];
1160
		if (tmp >= NUM_ENDPOINTS || (tmp && !ep->desc))
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
			goto stall;

		if (tmp) {
			if ((w_index & USB_DIR_IN)) {
				if (!ep->is_in)
					goto stall;
			} else if (ep->is_in)
				goto stall;
		}
		PACKET("get %s status\n", ep->ep.name);
		if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL)
			tmp = (1 << USB_ENDPOINT_HALT);
		else
			tmp = 0;
		__raw_writeb(tmp, dreg);
		__raw_writeb(0, dreg);
		goto write_in;
		/* then STATUS starts later, automatically */
	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
			| USB_REQ_SET_FEATURE:
		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
		ep = &udc->ep[tmp];
1183
		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
			goto stall;
		if (!ep->desc || ep->is_iso)
			goto stall;
		if ((w_index & USB_DIR_IN)) {
			if (!ep->is_in)
				goto stall;
		} else if (ep->is_in)
			goto stall;

		tmp = __raw_readl(ep->creg);
		tmp &= ~SET_FX;
		tmp |= CLR_FX | AT91_UDP_FORCESTALL;
		__raw_writel(tmp, ep->creg);
		goto succeed;
	case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8)
			| USB_REQ_CLEAR_FEATURE:
		tmp = w_index & USB_ENDPOINT_NUMBER_MASK;
		ep = &udc->ep[tmp];
1202
		if (w_value != USB_ENDPOINT_HALT || tmp >= NUM_ENDPOINTS)
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
			goto stall;
		if (tmp == 0)
			goto succeed;
		if (!ep->desc || ep->is_iso)
			goto stall;
		if ((w_index & USB_DIR_IN)) {
			if (!ep->is_in)
				goto stall;
		} else if (ep->is_in)
			goto stall;

1214
1215
		at91_udp_write(udc, AT91_UDP_RST_EP, ep->int_mask);
		at91_udp_write(udc, AT91_UDP_RST_EP, 0);
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
		tmp = __raw_readl(ep->creg);
		tmp |= CLR_FX;
		tmp &= ~(SET_FX | AT91_UDP_FORCESTALL);
		__raw_writel(tmp, ep->creg);
		if (!list_empty(&ep->queue))
			handle_ep(ep);
		goto succeed;
	}

#undef w_value
#undef w_index
#undef w_length

	/* pass request up to the gadget driver */
1230
1231
1232
1233
	if (udc->driver)
		status = udc->driver->setup(&udc->gadget, &pkt.r);
	else
		status = -ENODEV;
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
	if (status < 0) {
stall:
		VDBG("req %02x.%02x protocol STALL; stat %d\n",
				pkt.r.bRequestType, pkt.r.bRequest, status);
		csr |= AT91_UDP_FORCESTALL;
		__raw_writel(csr, creg);
		udc->req_pending = 0;
	}
	return;

succeed:
	/* immediate successful (IN) STATUS after zero length DATA */
	PACKET("ep0 in/status\n");
write_in:
	csr |= AT91_UDP_TXPKTRDY;
	__raw_writel(csr, creg);
	udc->req_pending = 0;
	return;
}

static void handle_ep0(struct at91_udc *udc)
{
	struct at91_ep		*ep0 = &udc->ep[0];
	u32 __iomem		*creg = ep0->creg;
	u32			csr = __raw_readl(creg);
	struct at91_request	*req;

	if (unlikely(csr & AT91_UDP_STALLSENT)) {
		nuke(ep0, -EPROTO);
		udc->req_pending = 0;
		csr |= CLR_FX;
		csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL);
		__raw_writel(csr, creg);
		VDBG("ep0 stalled\n");
		csr = __raw_readl(creg);
	}
	if (csr & AT91_UDP_RXSETUP) {
		nuke(ep0, 0);
		udc->req_pending = 0;
		handle_setup(udc, ep0, csr);
		return;
	}

	if (list_empty(&ep0->queue))
		req = NULL;
	else
		req = list_entry(ep0->queue.next, struct at91_request, queue);

	/* host ACKed an IN packet that we sent */
	if (csr & AT91_UDP_TXCOMP) {
		csr |= CLR_FX;
		csr &= ~(SET_FX | AT91_UDP_TXCOMP);

		/* write more IN DATA? */
		if (req && ep0->is_in) {
			if (handle_ep(ep0))
				udc->req_pending = 0;

		/*
		 * Ack after:
		 *  - last IN DATA packet (including GET_STATUS)
		 *  - IN/STATUS for OUT DATA
		 *  - IN/STATUS for any zero-length DATA stage
		 * except for the IN DATA case, the host should send
		 * an OUT status later, which we'll ack.
		 */
		} else {
			udc->req_pending = 0;
			__raw_writel(csr, creg);

			/*
			 * SET_ADDRESS takes effect only after the STATUS
			 * (to the original address) gets acked.
			 */
			if (udc->wait_for_addr_ack) {
				u32	tmp;

1311
				at91_udp_write(udc, AT91_UDP_FADDR,
1312
						AT91_UDP_FEN | udc->addr);
1313
				tmp = at91_udp_read(udc, AT91_UDP_GLB_STAT);
1314
1315
1316
				tmp &= ~AT91_UDP_FADDEN;
				if (udc->addr)
					tmp |= AT91_UDP_FADDEN;
1317
				at91_udp_write(udc, AT91_UDP_GLB_STAT, tmp);
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376

				udc->wait_for_addr_ack = 0;
				VDBG("address %d\n", udc->addr);
			}
		}
	}

	/* OUT packet arrived ... */
	else if (csr & AT91_UDP_RX_DATA_BK0) {
		csr |= CLR_FX;
		csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0);

		/* OUT DATA stage */
		if (!ep0->is_in) {
			if (req) {
				if (handle_ep(ep0)) {
					/* send IN/STATUS */
					PACKET("ep0 in/status\n");
					csr = __raw_readl(creg);
					csr &= ~SET_FX;
					csr |= CLR_FX | AT91_UDP_TXPKTRDY;
					__raw_writel(csr, creg);
					udc->req_pending = 0;
				}
			} else if (udc->req_pending) {
				/*
				 * AT91 hardware has a hard time with this
				 * "deferred response" mode for control-OUT
				 * transfers.  (For control-IN it's fine.)
				 *
				 * The normal solution leaves OUT data in the
				 * fifo until the gadget driver is ready.
				 * We couldn't do that here without disabling
				 * the IRQ that tells about SETUP packets,
				 * e.g. when the host gets impatient...
				 *
				 * Working around it by copying into a buffer
				 * would almost be a non-deferred response,
				 * except that it wouldn't permit reliable
				 * stalling of the request.  Instead, demand
				 * that gadget drivers not use this mode.
				 */
				DBG("no control-OUT deferred responses!\n");
				__raw_writel(csr | AT91_UDP_FORCESTALL, creg);
				udc->req_pending = 0;
			}

		/* STATUS stage for control-IN; ack.  */
		} else {
			PACKET("ep0 out/status ACK\n");
			__raw_writel(csr, creg);

			/* "early" status stage */
			if (req)
				done(ep0, req, 0);
		}
	}
}

1377
static irqreturn_t at91_udc_irq (int irq, void *_udc)
1378
1379
1380
1381
1382
{
	struct at91_udc		*udc = _udc;
	u32			rescans = 5;

	while (rescans--) {
1383
		u32 status;
1384

1385
1386
		status = at91_udp_read(udc, AT91_UDP_ISR)
			& at91_udp_read(udc, AT91_UDP_IMR);
1387
1388
1389
1390
1391
		if (!status)
			break;

		/* USB reset irq:  not maskable */
		if (status & AT91_UDP_ENDBUSRES) {
1392
1393
			at91_udp_write(udc, AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS);
			at91_udp_write(udc, AT91_UDP_IER, MINIMUS_INTERRUPTUS);
1394
			/* Atmel code clears this irq twice */
1395
1396
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_ENDBUSRES);
1397
1398
1399
1400
1401
			VDBG("end bus reset\n");
			udc->addr = 0;
			stop_activity(udc);

			/* enable ep0 */
1402
			at91_udp_write(udc, AT91_UDP_CSR(0),
1403
					AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL);
1404
1405
			udc->gadget.speed = USB_SPEED_FULL;
			udc->suspended = 0;
1406
			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_EP(0));
1407
1408
1409

			/*
			 * NOTE:  this driver keeps clocks off unless the
1410
1411
1412
			 * USB host is present.  That saves power, but for
			 * boards that don't support VBUS detection, both
			 * clocks need to be active most of the time.
1413
1414
1415
1416
			 */

		/* host initiated suspend (3+ms bus idle) */
		} else if (status & AT91_UDP_RXSUSP) {
1417
1418
1419
			at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXSUSP);
			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXRSM);
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXSUSP);
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
			// VDBG("bus suspend\n");
			if (udc->suspended)
				continue;
			udc->suspended = 1;

			/*
			 * NOTE:  when suspending a VBUS-powered device, the
			 * gadget driver should switch into slow clock mode
			 * and then into standby to avoid drawing more than
			 * 500uA power (2500uA for some high-power configs).
			 */
			if (udc->driver && udc->driver->suspend)
				udc->driver->suspend(&udc->gadget);

		/* host initiated resume */
		} else if (status & AT91_UDP_RXRSM) {
1436
1437
1438
			at91_udp_write(udc, AT91_UDP_IDR, AT91_UDP_RXRSM);
			at91_udp_write(udc, AT91_UDP_IER, AT91_UDP_RXSUSP);
			at91_udp_write(udc, AT91_UDP_ICR, AT91_UDP_RXRSM);
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
			// VDBG("bus resume\n");
			if (!udc->suspended)
				continue;
			udc->suspended = 0;

			/*
			 * NOTE:  for a VBUS-powered device, the gadget driver
			 * would normally want to switch out of slow clock
			 * mode into normal mode.
			 */
			if (udc->driver && udc->driver->resume)
				udc->driver->resume(&udc->gadget);

		/* endpoint IRQs are cleared by handling them */
		} else {
			int		i;
			unsigned	mask = 1;
			struct at91_ep	*ep = &udc->ep[1];

			if (status & mask)
				handle_ep0(udc);
			for (i = 1; i < NUM_ENDPOINTS; i++) {
				mask <<= 1;
				if (status & mask)
					handle_ep(ep);
				ep++;
			}
		}
	}

	return IRQ_HANDLED;
}

/*-------------------------------------------------------------------------*/

1474
1475
1476
1477
1478
static void nop_release(struct device *dev)
{
	/* nothing to free */
}

1479
1480
static struct at91_udc controller = {
	.gadget = {
1481
1482
1483
1484
1485
1486
		.ops	= &at91_udc_ops,
		.ep0	= &controller.ep[0].ep,
		.name	= driver_name,
		.dev	= {
			.bus_id = "gadget",
			.release = nop_release,
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
		}
	},
	.ep[0] = {
		.ep = {
			.name	= ep0name,
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.maxpacket	= 8,
		.int_mask	= 1 << 0,
	},
	.ep[1] = {
		.ep = {
			.name	= "ep1",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.is_pingpong	= 1,
		.maxpacket	= 64,
		.int_mask	= 1 << 1,
	},
	.ep[2] = {
		.ep = {
			.name	= "ep2",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.is_pingpong	= 1,
		.maxpacket	= 64,
		.int_mask	= 1 << 2,
	},
	.ep[3] = {
		.ep = {
			/* could actually do bulk too */
			.name	= "ep3-int",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.maxpacket	= 8,
		.int_mask	= 1 << 3,
	},
	.ep[4] = {
		.ep = {
			.name	= "ep4",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.is_pingpong	= 1,
		.maxpacket	= 256,
		.int_mask	= 1 << 4,
	},
	.ep[5] = {
		.ep = {
			.name	= "ep5",
			.ops	= &at91_ep_ops,
		},
		.udc		= &controller,
		.is_pingpong	= 1,
		.maxpacket	= 256,
		.int_mask	= 1 << 5,
	},
1548
	/* ep6 and ep7 are also reserved (custom silicon might use them) */
1549
1550
};

1551
static irqreturn_t at91_vbus_irq(int irq, void *_udc)
1552
1553
1554
1555
1556
1557
{
	struct at91_udc	*udc = _udc;
	unsigned	value;

	/* vbus needs at least brief debouncing */
	udelay(10);
1558
	value = gpio_get_value(udc->board.vbus_pin);
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
	if (value != udc->vbus)
		at91_vbus_session(&udc->gadget, value);

	return IRQ_HANDLED;
}

int usb_gadget_register_driver (struct usb_gadget_driver *driver)
{
	struct at91_udc	*udc = &controller;
	int		retval;

	if (!driver
1571
			|| driver->speed < USB_SPEED_FULL
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
			|| !driver->bind
			|| !driver->setup) {
		DBG("bad parameter.\n");
		return -EINVAL;
	}

	if (udc->driver) {
		DBG("UDC already has a gadget driver\n");
		return -EBUSY;
	}

	udc->driver = driver;
	udc->gadget.dev.driver = &driver->driver;
	udc->gadget.dev.driver_data = &driver->driver;
	udc->enabled = 1;
	udc->selfpowered = 1;

	retval = driver->bind(&udc->gadget);
	if (retval) {
		DBG("driver->bind() returned %d\n", retval);
		udc->driver = NULL;
1593
1594
1595
1596
		udc->gadget.dev.driver = NULL;
		udc->gadget.dev.driver_data = NULL;
		udc->enabled = 0;
		udc->selfpowered = 0;
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
		return retval;
	}

	local_irq_disable();
	pullup(udc, 1);
	local_irq_enable();

	DBG("bound to %s\n", driver->driver.name);
	return 0;
}
EXPORT_SYMBOL (usb_gadget_register_driver);

int usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
{
	struct at91_udc *udc = &controller;

1613
	if (!driver || driver != udc->driver || !driver->unbind)
1614
1615
1616
1617
		return -EINVAL;

	local_irq_disable();
	udc->enabled = 0;
1618
	at91_udp_write(udc, AT91_UDP_IDR, ~0);
1619
1620
1621
1622
	pullup(udc, 0);
	local_irq_enable();

	driver->unbind(&udc->gadget);
1623
1624
	udc->gadget.dev.driver = NULL;
	udc->gadget.dev.driver_data = NULL;
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
	udc->driver = NULL;

	DBG("unbound from %s\n", driver->driver.name);
	return 0;
}
EXPORT_SYMBOL (usb_gadget_unregister_driver);

/*-------------------------------------------------------------------------*/

static void at91udc_shutdown(struct platform_device *dev)
{
	/* force disconnect on reboot */
	pullup(platform_get_drvdata(dev), 0);
}

1640
static int __init at91udc_probe(struct platform_device *pdev)
1641
1642
1643
1644
{
	struct device	*dev = &pdev->dev;
	struct at91_udc	*udc;
	int		retval;
1645
	struct resource	*res;
1646
1647
1648
1649
1650
1651
1652

	if (!dev->platform_data) {
		/* small (so we copy it) but critical! */
		DBG("missing platform_data\n");
		return -ENODEV;
	}

1653
	if (pdev->num_resources != 2) {
1654
		DBG("invalid num_resources\n");
1655
1656
1657
1658
		return -ENODEV;
	}
	if ((pdev->resource[0].flags != IORESOURCE_MEM)
			|| (pdev->resource[1].flags != IORESOURCE_IRQ)) {
1659
		DBG("invalid resource type\n");
1660
1661
1662
		return -ENODEV;
	}

1663
1664
1665
1666
1667
1668
1669
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENXIO;

	if (!request_mem_region(res->start,
			res->end - res->start + 1,
			driver_name)) {
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
		DBG("someone's using UDC memory\n");
		return -EBUSY;
	}

	/* init software state */
	udc = &controller;
	udc->gadget.dev.parent = dev;
	udc->board = *(struct at91_udc_data *) dev->platform_data;
	udc->pdev = pdev;
	udc->enabled = 0;

1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
	/* rm9200 needs manual D+ pullup; off by default */
	if (cpu_is_at91rm9200()) {
		if (udc->board.pullup_pin <= 0) {
			DBG("no D+ pullup?\n");
			retval = -ENODEV;
			goto fail0;
		}
		retval = gpio_request(udc->board.pullup_pin, "udc_pullup");
		if (retval) {
			DBG("D+ pullup is busy\n");
			goto fail0;
		}
		gpio_direction_output(udc->board.pullup_pin,
				udc->board.pullup_active_low);
	}

1697
1698
	udc->udp_baseaddr = ioremap(res->start, res->end - res->start + 1);
	if (!udc->udp_baseaddr) {
1699
1700
		retval = -ENOMEM;
		goto fail0a;
1701
1702
1703
1704
	}

	udc_reinit(udc);

1705
1706
1707
1708
1709
	/* get interface and function clocks */
	udc->iclk = clk_get(dev, "udc_clk");
	udc->fclk = clk_get(dev, "udpck");
	if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
		DBG("clocks missing\n");
Andrew Victor's avatar
Andrew Victor committed
1710
		retval = -ENODEV;
1711
1712
		/* NOTE: we "know" here that refcounts on these are NOPs */
		goto fail0b;
1713
1714
1715
1716
	}

	retval = device_register(&udc->gadget.dev);
	if (retval < 0)
1717
		goto fail0b;
1718

1719
1720
	/* don't do anything until we have both gadget driver and VBUS */
	clk_enable(udc->iclk);
1721
1722
	at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS);
	at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff);
Andrew Victor's avatar
Andrew Victor committed
1723
1724
	/* Clear all pending interrupts - UDP may be used by bootloader. */
	at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff);
1725
	clk_disable(udc->iclk);
1726
1727

	/* request UDC and maybe VBUS irqs */
1728
	udc->udp_irq = platform_get_irq(pdev, 0);
1729
1730
1731
	retval = request_irq(udc->udp_irq, at91_udc_irq,
			IRQF_DISABLED, driver_name, udc);
	if (retval < 0) {
1732
		DBG("request irq %d failed\n", udc->udp_irq);
1733
1734
1735
		goto fail1;
	}
	if (udc->board.vbus_pin > 0) {
1736
1737
1738
1739
1740
1741
1742
		retval = gpio_request(udc->board.vbus_pin, "udc_vbus");
		if (retval < 0) {
			DBG("request vbus pin failed\n");
			goto fail2;
		}
		gpio_direction_input(udc->board.vbus_pin);

Andrew Victor's avatar
Andrew Victor committed
1743
1744
1745
1746
		/*
		 * Get the initial state of VBUS - we cannot expect
		 * a pending interrupt.
		 */
1747
		udc->vbus = gpio_get_value(udc->board.vbus_pin);
1748
1749
1750
1751
1752
		if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
				IRQF_DISABLED, driver_name, udc)) {
			DBG("request vbus irq %d failed\n",
					udc->board.vbus_pin);
			free_irq(udc->udp_irq, udc);
1753
			retval = -EBUSY;
1754
			goto fail3;
1755
1756
1757
1758
1759
1760
		}
	} else {
		DBG("no VBUS detection, assuming always-on\n");
		udc->vbus = 1;
	}
	dev_set_drvdata(dev, udc);
1761
	device_init_wakeup(dev, 1);
1762
1763
1764
1765
1766
	create_debug_file(udc);

	INFO("%s version %s\n", driver_name, DRIVER_VERSION);
	return 0;

1767
1768
1769
1770
1771
fail3:
	if (udc->board.vbus_pin > 0)
		gpio_free(udc->board.vbus_pin);
fail2:
	free_irq(udc->udp_irq, udc);
1772
1773
fail1:
	device_unregister(&udc->gadget.dev);
1774
1775
1776
1777
1778
fail0b:
	iounmap(udc->udp_baseaddr);
fail0a:
	if (cpu_is_at91rm9200())
		gpio_free(udc->board.pullup_pin);
1779
fail0:
1780
	release_mem_region(res->start, res->end - res->start + 1);
1781
1782
1783
1784
	DBG("%s probe failed, %d\n", driver_name, retval);
	return retval;
}

1785
static int __exit at91udc_remove(struct platform_device *pdev)
1786
{
1787
	struct at91_udc *udc = platform_get_drvdata(pdev);
1788
	struct resource *res;
1789
1790
1791

	DBG("remove\n");

1792
1793
	if (udc->driver)
		return -EBUSY;
1794

1795
	pullup(udc, 0);
1796

1797
	device_init_wakeup(&pdev->dev, 0);
1798
	remove_debug_file(udc);
1799
	if (udc->board.vbus_pin > 0) {
1800
		free_irq(udc->board.vbus_pin, udc);
1801
1802
		gpio_free(udc->board.vbus_pin);
	}
1803
	free_irq(udc->udp_irq, udc);
1804
	device_unregister(&udc->gadget.dev);
1805
1806

	iounmap(udc->udp_baseaddr);
1807
1808
1809
1810

	if (cpu_is_at91rm9200())
		gpio_free(udc->board.pullup_pin);

1811
1812
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, res->end - res->start + 1);
1813
1814
1815
1816
1817
1818
1819
1820

	clk_put(udc->iclk);
	clk_put(udc->fclk);

	return 0;
}

#ifdef CONFIG_PM
1821
static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
1822
{
1823
1824
	struct at91_udc *udc = platform_get_drvdata(pdev);
	int		wake = udc->driver && device_may_wakeup(&pdev->dev);
1825

1826
1827
1828
1829
	/* Unless we can act normally to the host (letting it wake us up
	 * whenever it has work for us) force disconnect.  Wakeup requires
	 * PLLB for USB events (signaling for reset, wakeup, or incoming
	 * tokens) and VBUS irqs (on systems which support them).
1830