summaryrefslogtreecommitdiffstats
path: root/drivers/usb/gadget/pxa27x_udc.c
blob: efd5c7fda146177cb521dd819fcae332679a60bb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
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
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
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
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
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
472
473
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
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
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
667
668
669
670
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
699
700
701
702
703
/*
 * PXA27x USB device driver for u-boot.
 *
 * Copyright (C) 2007 Rodolfo Giometti <giometti@linux.it>
 * Copyright (C) 2007 Eurotech S.p.A.  <info@eurotech.it>
 * Copyright (C) 2008 Vivek Kutal      <vivek.kutal@azingo.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */


#include <common.h>
#include <config.h>
#include <asm/byteorder.h>
#include <usbdevice.h>
#include <asm/arch/hardware.h>
#include <asm/io.h>
#include <usb/pxa27x_udc.h>
#include <usb/udc.h>

#include "ep0.h"

/* number of endpoints on this UDC */
#define UDC_MAX_ENDPOINTS	24

static struct urb *ep0_urb;
static struct usb_device_instance *udc_device;
static int ep0state = EP0_IDLE;

#ifdef USBDDBG
static void udc_dump_buffer(char *name, u8 *buf, int len)
{
	usbdbg("%s - buf %p, len %d", name, buf, len);
	print_buffer(0, buf, 1, len, 0);
}
#else
#define udc_dump_buffer(name, buf, len)		/* void */
#endif

static inline void udc_ack_int_UDCCR(int mask)
{
	writel(readl(USIR1) | mask, USIR1);
}

/*
 * If the endpoint has an active tx_urb, then the next packet of data from the
 * URB is written to the tx FIFO.
 * The total amount of data in the urb is given by urb->actual_length.
 * The maximum amount of data that can be sent in any one packet is given by
 * endpoint->tx_packetSize.
 * The number of data bytes from this URB that have already been transmitted
 * is given by endpoint->sent.
 * endpoint->last is updated by this routine with the number of data bytes
 * transmitted in this packet.
 */
static int udc_write_urb(struct usb_endpoint_instance *endpoint)
{
	struct urb *urb = endpoint->tx_urb;
	int ep_num = endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK;
	u32 *data32 = (u32 *) urb->buffer;
	u8  *data8 = (u8 *) urb->buffer;
	unsigned int i, n, w, b, is_short;
	int timeout = 2000;	/* 2ms */

	if (!urb || !urb->actual_length)
		return -1;

	n = min(urb->actual_length - endpoint->sent, endpoint->tx_packetSize);
	if (n <= 0)
		return -1;

	usbdbg("write urb on ep %d", ep_num);
#if defined(USBDDBG) && defined(USBDPARANOIA)
	usbdbg("urb: buf %p, buf_len %d, actual_len %d",
		urb->buffer, urb->buffer_length, urb->actual_length);
	usbdbg("endpoint: sent %d, tx_packetSize %d, last %d",
		endpoint->sent, endpoint->tx_packetSize, endpoint->last);
#endif

	is_short = n != endpoint->tx_packetSize;
	w = n / 4;
	b = n % 4;
	usbdbg("n %d%s w %d b %d", n, is_short ? "-s" : "", w, b);
	udc_dump_buffer("urb write", data8 + endpoint->sent, n);

	/* Prepare for data send */
	if (ep_num)
		writel(UDCCSR_PC ,UDCCSN(ep_num));

	for (i = 0; i < w; i++)
		  writel(data32[endpoint->sent / 4 + i], UDCDN(ep_num));

	for (i = 0; i < b; i++)
		  writeb(data8[endpoint->sent + w * 4 + i], UDCDN(ep_num));

	/* Set "Packet Complete" if less data then tx_packetSize */
	if (is_short)
		writel(ep_num ? UDCCSR_SP : UDCCSR0_IPR, UDCCSN(ep_num));

	/* Wait for data sent */
	if (ep_num) {
		while (!(readl(UDCCSN(ep_num)) & UDCCSR_PC)) {
			if (timeout-- == 0)
				return -1;
			else
				udelay(1);
		}
	}

	endpoint->last = n;

	if (ep_num) {
		usbd_tx_complete(endpoint);
	} else {
		endpoint->sent += n;
		endpoint->last -= n;
	}

	if (endpoint->sent >= urb->actual_length) {
		urb->actual_length = 0;
		endpoint->sent = 0;
		endpoint->last = 0;
	}

	if ((endpoint->sent >= urb->actual_length) && (!ep_num)) {
		usbdbg("ep0 IN stage done");
		if (is_short)
			ep0state = EP0_IDLE;
		else
			ep0state = EP0_XFER_COMPLETE;
	}

	return 0;
}

static int udc_read_urb(struct usb_endpoint_instance *endpoint)
{
	struct urb *urb = endpoint->rcv_urb;
	int ep_num = endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK;
	u32 *data32 = (u32 *) urb->buffer;
	unsigned int i, n;

	usbdbg("read urb on ep %d", ep_num);
#if defined(USBDDBG) && defined(USBDPARANOIA)
	usbdbg("urb: buf %p, buf_len %d, actual_len %d",
		urb->buffer, urb->buffer_length, urb->actual_length);
	usbdbg("endpoint: rcv_packetSize %d",
		endpoint->rcv_packetSize);
#endif

	if (readl(UDCCSN(ep_num)) & UDCCSR_BNE)
		n = readl(UDCBCN(ep_num)) & 0x3ff;
	else /* zlp */
		n = 0;

	usbdbg("n %d%s", n, n != endpoint->rcv_packetSize ? "-s" : "");
	for (i = 0; i < n; i += 4)
		data32[urb->actual_length / 4 + i / 4] = readl(UDCDN(ep_num));

	udc_dump_buffer("urb read", (u8 *) data32, urb->actual_length + n);
	usbd_rcv_complete(endpoint, n, 0);

	return 0;
}

static int udc_read_urb_ep0(void)
{
	u32 *data32 = (u32 *) ep0_urb->buffer;
	u8 *data8 = (u8 *) ep0_urb->buffer;
	unsigned int i, n, w, b;

	usbdbg("read urb on ep 0");
#if defined(USBDDBG) && defined(USBDPARANOIA)
	usbdbg("urb: buf %p, buf_len %d, actual_len %d",
		ep0_urb->buffer, ep0_urb->buffer_length, ep0_urb->actual_length);
#endif

	n = readl(UDCBCR0);
	w = n / 4;
	b = n % 4;

	for (i = 0; i < w; i++) {
		data32[ep0_urb->actual_length / 4 + i] = readl(UDCDN(0));
		/* ep0_urb->actual_length += 4; */
	}

	for (i = 0; i < b; i++) {
		data8[ep0_urb->actual_length + w * 4 + i] = readb(UDCDN(0));
		/* ep0_urb->actual_length++; */
	}

	ep0_urb->actual_length += n;

	udc_dump_buffer("urb read", (u8 *) data32, ep0_urb->actual_length);

	writel(UDCCSR0_OPC | UDCCSR0_IPR, UDCCSR0);
	if (ep0_urb->actual_length == ep0_urb->device_request.wLength)
		return 1;

	return 0;
}

static void udc_handle_ep0(struct usb_endpoint_instance *endpoint)
{
	u32 udccsr0 = readl(UDCCSR0);
	u32 *data = (u32 *) &ep0_urb->device_request;
	int i;

	usbdbg("udccsr0 %x", udccsr0);

	/* Clear stall status */
	if (udccsr0 & UDCCSR0_SST) {
		usberr("clear stall status");
		writel(UDCCSR0_SST, UDCCSR0);
		ep0state = EP0_IDLE;
	}

	/* previous request unfinished?  non-error iff back-to-back ... */
	if ((udccsr0 & UDCCSR0_SA) != 0 && ep0state != EP0_IDLE)
		ep0state = EP0_IDLE;

	switch (ep0state) {

	case EP0_IDLE:
		udccsr0 = readl(UDCCSR0);
		/* Start control request? */
		if ((udccsr0 & (UDCCSR0_OPC | UDCCSR0_SA | UDCCSR0_RNE))
			== (UDCCSR0_OPC | UDCCSR0_SA | UDCCSR0_RNE)) {

			/* Read SETUP packet.
			 * SETUP packet size is 8 bytes (aka 2 words)
			 */
			usbdbg("try reading SETUP packet");
			for (i = 0; i < 2; i++) {
				if ((readl(UDCCSR0) & UDCCSR0_RNE) == 0) {
					usberr("setup packet too short:%d", i);
					goto stall;
				}
				data[i] = readl(UDCDR0);
			}

			writel(readl(UDCCSR0) | UDCCSR0_OPC | UDCCSR0_SA, UDCCSR0);
			if ((readl(UDCCSR0) & UDCCSR0_RNE) != 0) {
				usberr("setup packet too long");
				goto stall;
			}

			udc_dump_buffer("ep0 setup read", (u8 *) data, 8);

			if (ep0_urb->device_request.wLength == 0) {
				usbdbg("Zero Data control Packet\n");
				if (ep0_recv_setup(ep0_urb)) {
					usberr("Invalid Setup Packet\n");
					udc_dump_buffer("ep0 setup read",
								(u8 *)data, 8);
					goto stall;
				}
				writel(UDCCSR0_IPR, UDCCSR0);
				ep0state = EP0_IDLE;
			} else {
				/* Check direction */
				if ((ep0_urb->device_request.bmRequestType &
						USB_REQ_DIRECTION_MASK)
						== USB_REQ_HOST2DEVICE) {
					ep0state = EP0_OUT_DATA;
					ep0_urb->buffer =
						(u8 *)ep0_urb->buffer_data;
					ep0_urb->buffer_length =
						sizeof(ep0_urb->buffer_data);
					ep0_urb->actual_length = 0;
					writel(UDCCSR0_IPR, UDCCSR0);
				} else {
					/* The ep0_recv_setup function has
					 * already placed our response packet
					 * data in ep0_urb->buffer and the
					 * packet length in
					 * ep0_urb->actual_length.
					 */
					if (ep0_recv_setup(ep0_urb)) {
stall:
						usberr("Invalid setup packet");
						udc_dump_buffer("ep0 setup read"
							, (u8 *) data, 8);
						ep0state = EP0_IDLE;

						writel(UDCCSR0_SA |
						UDCCSR0_OPC | UDCCSR0_FST |
						UDCCS0_FTF, UDCCSR0);

						return;
					}

					endpoint->tx_urb = ep0_urb;
					endpoint->sent = 0;
					usbdbg("EP0_IN_DATA");
					ep0state = EP0_IN_DATA;
					if (udc_write_urb(endpoint) < 0)
						goto stall;

				}
			}
			return;
		} else if ((udccsr0 & (UDCCSR0_OPC | UDCCSR0_SA))
			== (UDCCSR0_OPC|UDCCSR0_SA)) {
			usberr("Setup Active but no data. Stalling ....\n");
			goto stall;
		} else {
			usbdbg("random early IRQs");
			/* Some random early IRQs:
			 * - we acked FST
			 * - IPR cleared
			 * - OPC got set, without SA (likely status stage)
			 */
			writel(udccsr0 & (UDCCSR0_SA | UDCCSR0_OPC), UDCCSR0);
		}
		break;

	case EP0_OUT_DATA:

		if ((udccsr0 & UDCCSR0_OPC) && !(udccsr0 & UDCCSR0_SA)) {
			if (udc_read_urb_ep0()) {
read_complete:
				ep0state = EP0_IDLE;
				if (ep0_recv_setup(ep0_urb)) {
					/* Not a setup packet, stall next
					 * EP0 transaction
					 */
					udc_dump_buffer("ep0 setup read",
							(u8 *) data, 8);
					usberr("can't parse setup packet\n");
					goto stall;
				}
			}
		} else if (!(udccsr0 & UDCCSR0_OPC) &&
				!(udccsr0 & UDCCSR0_IPR)) {
			if (ep0_urb->device_request.wLength ==
				ep0_urb->actual_length)
				goto read_complete;

			usberr("Premature Status\n");
			ep0state = EP0_IDLE;
		}
		break;

	case EP0_IN_DATA:
		/* GET_DESCRIPTOR etc */
		if (udccsr0 & UDCCSR0_OPC) {
			writel(UDCCSR0_OPC | UDCCSR0_FTF, UDCCSR0);
			usberr("ep0in premature status");
			ep0state = EP0_IDLE;
		} else {
			/* irq was IPR clearing */
			if (udc_write_urb(endpoint) < 0) {
				usberr("ep0_write_error\n");
				goto stall;
			}
		}
		break;

	case EP0_XFER_COMPLETE:
		writel(UDCCSR0_IPR, UDCCSR0);
		ep0state = EP0_IDLE;
		break;

	default:
		usbdbg("Default\n");
	}
	writel(USIR0_IR0, USIR0);
}

static void udc_handle_ep(struct usb_endpoint_instance *endpoint)
{
	int ep_addr = endpoint->endpoint_address;
	int ep_num = ep_addr & USB_ENDPOINT_NUMBER_MASK;
	int ep_isout = (ep_addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT;

	u32 flags = readl(UDCCSN(ep_num)) & (UDCCSR_SST | UDCCSR_TRN);
	if (flags)
		writel(flags, UDCCSN(ep_num));

	if (ep_isout)
		udc_read_urb(endpoint);
	else
		udc_write_urb(endpoint);

	writel(UDCCSR_PC, UDCCSN(ep_num));
}

static void udc_state_changed(void)
{

	writel(readl(UDCCR) | UDCCR_SMAC, UDCCR);

	usbdbg("New UDC settings are: conf %d - inter %d - alter %d",
	       (readl(UDCCR) & UDCCR_ACN) >> UDCCR_ACN_S,
	       (readl(UDCCR) & UDCCR_AIN) >> UDCCR_AIN_S,
	       (readl(UDCCR) & UDCCR_AAISN) >> UDCCR_AAISN_S);

	usbd_device_event_irq(udc_device, DEVICE_CONFIGURED, 0);
	writel(UDCISR1_IRCC, UDCISR1);
}

void udc_irq(void)
{
	int handled;
	struct usb_endpoint_instance *endpoint;
	int ep_num, i;
	u32 udcisr0;

	do {
		handled = 0;
		/* Suspend Interrupt Request */
		if (readl(USIR1) & UDCCR_SUSIR) {
			usbdbg("Suspend\n");
			udc_ack_int_UDCCR(UDCCR_SUSIR);
			handled = 1;
			ep0state = EP0_IDLE;
		}

		/* Resume Interrupt Request */
		if (readl(USIR1) & UDCCR_RESIR) {
			udc_ack_int_UDCCR(UDCCR_RESIR);
			handled = 1;
			usbdbg("USB resume\n");
		}

		if (readl(USIR1) & (1<<31)) {
			handled = 1;
			udc_state_changed();
		}

		/* Reset Interrupt Request */
		if (readl(USIR1) & UDCCR_RSTIR) {
			udc_ack_int_UDCCR(UDCCR_RSTIR);
			handled = 1;
			usbdbg("Reset\n");
			usbd_device_event_irq(udc_device, DEVICE_RESET, 0);
		} else {
			if (readl(USIR0))
				usbdbg("UISR0: %x \n", readl(USIR0));

			if (readl(USIR0) & 0x2)
				writel(0x2, USIR0);

			/* Control traffic */
			if (readl(USIR0)  & USIR0_IR0) {
				handled = 1;
				writel(USIR0_IR0, USIR0);
				udc_handle_ep0(udc_device->bus->endpoint_array);
			}

			endpoint = udc_device->bus->endpoint_array;
			for (i = 0; i < udc_device->bus->max_endpoints; i++) {
				ep_num = (endpoint[i].endpoint_address) &
						USB_ENDPOINT_NUMBER_MASK;
				if (!ep_num)
					continue;
				udcisr0 = readl(UDCISR0);
				if (udcisr0 &
					UDCISR_INT(ep_num, UDC_INT_PACKETCMP)) {
					writel(UDCISR_INT(ep_num, UDC_INT_PACKETCMP),
					       UDCISR0);
					udc_handle_ep(&endpoint[i]);
				}
			}
		}

	} while (handled);
}

/* The UDCCR reg contains mask and interrupt status bits,
 * so using '|=' isn't safe as it may ack an interrupt.
 */
#define UDCCR_OEN		(1 << 31)   /* On-the-Go Enable */
#define UDCCR_MASK_BITS     	(UDCCR_OEN | UDCCR_UDE)

static inline void udc_set_mask_UDCCR(int mask)
{
    writel((readl(UDCCR) & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS), UDCCR);
}

static inline void udc_clear_mask_UDCCR(int mask)
{
    writel((readl(UDCCR) & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS), UDCCR);
}

static void pio_irq_enable(int ep_num)
{
	if (ep_num < 16)
		writel(readl(UDCICR0) | 3 << (ep_num * 2), UDCICR0);
	else {
		ep_num -= 16;
		writel(readl(UDCICR1) | 3 << (ep_num * 2), UDCICR1);
	}
}

/*
 * udc_set_nak
 *
 * Allow upper layers to signal lower layers should not accept more RX data
 */
void udc_set_nak(int ep_num)
{
	/* TODO */
}

/*
 * udc_unset_nak
 *
 * Suspend sending of NAK tokens for DATA OUT tokens on a given endpoint.
 * Switch off NAKing on this endpoint to accept more data output from host.
 */
void udc_unset_nak(int ep_num)
{
	/* TODO */
}

int udc_endpoint_write(struct usb_endpoint_instance *endpoint)
{
	return udc_write_urb(endpoint);
}

/* Associate a physical endpoint with endpoint instance */
void udc_setup_ep(struct usb_device_instance *device, unsigned int id,
				struct usb_endpoint_instance *endpoint)
{
	int ep_num, ep_addr, ep_isout, ep_type, ep_size;
	int config, interface, alternate;
	u32 tmp;

	usbdbg("setting up endpoint id %d", id);

	if (!endpoint) {
		usberr("endpoint void!");
		return;
	}

	ep_num = endpoint->endpoint_address & USB_ENDPOINT_NUMBER_MASK;
	if (ep_num >= UDC_MAX_ENDPOINTS) {
		usberr("unable to setup ep %d!", ep_num);
		return;
	}

	pio_irq_enable(ep_num);
	if (ep_num == 0) {
		/* Done for ep0 */
		return;
	}

	config = 1;
	interface = 0;
	alternate = 0;

	usbdbg("config %d - interface %d - alternate %d",
		config, interface, alternate);

	ep_addr = endpoint->endpoint_address;
	ep_num = ep_addr & USB_ENDPOINT_NUMBER_MASK;
	ep_isout = (ep_addr & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT;
	ep_type = ep_isout ? endpoint->rcv_attributes : endpoint->tx_attributes;
	ep_size = ep_isout ? endpoint->rcv_packetSize : endpoint->tx_packetSize;

	usbdbg("addr %x, num %d, dir %s, type %s, packet size %d",
		ep_addr, ep_num,
		ep_isout ? "out" : "in",
		ep_type == USB_ENDPOINT_XFER_ISOC ? "isoc" :
		ep_type == USB_ENDPOINT_XFER_BULK ? "bulk" :
		ep_type == USB_ENDPOINT_XFER_INT ? "int" : "???",
		ep_size
		);

	/* Configure UDCCRx */
	tmp = 0;
	tmp |= (config << UDCCONR_CN_S) & UDCCONR_CN;
	tmp |= (interface << UDCCONR_IN_S) & UDCCONR_IN;
	tmp |= (alternate << UDCCONR_AISN_S) & UDCCONR_AISN;
	tmp |= (ep_num << UDCCONR_EN_S) & UDCCONR_EN;
	tmp |= (ep_type << UDCCONR_ET_S) & UDCCONR_ET;
	tmp |= ep_isout ? 0 : UDCCONR_ED;
	tmp |= (ep_size << UDCCONR_MPS_S) & UDCCONR_MPS;
	tmp |= UDCCONR_EE;

	writel(tmp, UDCCN(ep_num));

	usbdbg("UDCCR%c = %x", 'A' + ep_num-1, readl(UDCCN(ep_num)));
	usbdbg("UDCCSR%c = %x", 'A' + ep_num-1, readl(UDCCSN(ep_num)));
}

/* Connect the USB device to the bus */
void udc_connect(void)
{
	usbdbg("UDC connect");

#ifdef CONFIG_USB_DEV_PULLUP_GPIO
	/* Turn on the USB connection by enabling the pullup resistor */
	writel(readl(GPDR(CONFIG_USB_DEV_PULLUP_GPIO))
		     | GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO),
	       GPDR(CONFIG_USB_DEV_PULLUP_GPIO));
	writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO), GPSR(CONFIG_USB_DEV_PULLUP_GPIO));
#else
	/* Host port 2 transceiver D+ pull up enable */
	writel(readl(UP2OCR) | UP2OCR_DPPUE, UP2OCR);
#endif
}

/* Disconnect the USB device to the bus */
void udc_disconnect(void)
{
	usbdbg("UDC disconnect");

#ifdef CONFIG_USB_DEV_PULLUP_GPIO
	/* Turn off the USB connection by disabling the pullup resistor */
	writel(GPIO_bit(CONFIG_USB_DEV_PULLUP_GPIO), GPCR(CONFIG_USB_DEV_PULLUP_GPIO));
#else
	/* Host port 2 transceiver D+ pull up disable */
	writel(readl(UP2OCR) & ~UP2OCR_DPPUE, UP2OCR);
#endif
}

/* Switch on the UDC */
void udc_enable(struct usb_device_instance *device)
{

	ep0state = EP0_IDLE;

	/* enable endpoint 0, A, B's Packet Complete Interrupt. */
	writel(0xffffffff, UDCICR0);
	writel(0xa8000000, UDCICR1);

	/* clear the interrupt status/control registers */
	writel(0xffffffff, UDCISR0);
	writel(0xffffffff, UDCISR1);

	/* set UDC-enable */
	udc_set_mask_UDCCR(UDCCR_UDE);

	udc_device = device;
	if (!ep0_urb)
		ep0_urb = usbd_alloc_urb(udc_device,
				udc_device->bus->endpoint_array);
	else
		usbinfo("ep0_urb %p already allocated", ep0_urb);

	usbdbg("UDC Enabled\n");
}

/* Need to check this again */
void udc_disable(void)
{
	usbdbg("disable UDC");

	udc_clear_mask_UDCCR(UDCCR_UDE);

	/* Disable clock for USB device */
	writel(readl(CKEN) & ~CKEN11_USB, CKEN);

	/* Free ep0 URB */
	if (ep0_urb) {
		usbd_dealloc_urb(ep0_urb);
		ep0_urb = NULL;
	}

	/* Reset device pointer */
	udc_device = NULL;
}

/* Allow udc code to do any additional startup */
void udc_startup_events(struct usb_device_instance *device)
{
	/* The DEVICE_INIT event puts the USB device in the state STATE_INIT */
	usbd_device_event_irq(device, DEVICE_INIT, 0);

	/* The DEVICE_CREATE event puts the USB device in the state
	 * STATE_ATTACHED */
	usbd_device_event_irq(device, DEVICE_CREATE, 0);

	/* Some USB controller driver implementations signal
	 * DEVICE_HUB_CONFIGURED and DEVICE_RESET events here.
	 * DEVICE_HUB_CONFIGURED causes a transition to the state
	 * STATE_POWERED, and DEVICE_RESET causes a transition to
	 * the state STATE_DEFAULT.
	 */
	udc_enable(device);
}

/* Initialize h/w stuff */
int udc_init(void)
{
	udc_device = NULL;
	usbdbg("PXA27x usbd start");

	/* Enable clock for USB device */
	writel(readl(CKEN) | CKEN11_USB, CKEN);

	/* Disable the UDC */
	udc_clear_mask_UDCCR(UDCCR_UDE);

	/* Disable IRQs: we don't use them */
	writel(0, UDCICR0);
	writel(0, UDCICR1);

	return 0;
}
OpenPOWER on IntegriCloud