summaryrefslogtreecommitdiffstats
path: root/common/usb_hub.c
blob: 0f39c9faf7ea4248cd8e60da5fc1b6446208ebf7 (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
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
730
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
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
/*
 * Most of this source has been derived from the Linux USB
 * project:
 * (C) Copyright Linus Torvalds 1999
 * (C) Copyright Johannes Erdfelt 1999-2001
 * (C) Copyright Andreas Gal 1999
 * (C) Copyright Gregory P. Smith 1999
 * (C) Copyright Deti Fliegl 1999 (new USB architecture)
 * (C) Copyright Randy Dunlap 2000
 * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
 * (C) Copyright Yggdrasil Computing, Inc. 2000
 *     (usb_device_id matching changes by Adam J. Richter)
 *
 * Adapted for U-Boot:
 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/****************************************************************************
 * HUB "Driver"
 * Probes device for being a hub and configurate it
 */

#include <common.h>
#include <command.h>
#include <dm.h>
#include <errno.h>
#include <memalign.h>
#include <asm/processor.h>
#include <asm/unaligned.h>
#include <linux/ctype.h>
#include <linux/list.h>
#include <asm/byteorder.h>
#ifdef CONFIG_SANDBOX
#include <asm/state.h>
#endif
#include <asm/unaligned.h>
#include <dm/root.h>

DECLARE_GLOBAL_DATA_PTR;

#include <usb.h>
#ifdef CONFIG_4xx
#include <asm/4xx_pci.h>
#endif

#define USB_BUFSIZ	512

#define HUB_SHORT_RESET_TIME	20
#define HUB_LONG_RESET_TIME	200

#define PORT_OVERCURRENT_MAX_SCAN_COUNT		3

struct usb_device_scan {
	struct usb_device *dev;		/* USB hub device to scan */
	struct usb_hub_device *hub;	/* USB hub struct */
	int port;			/* USB port to scan */
	struct list_head list;
};

/* TODO(sjg@chromium.org): Remove this when CONFIG_DM_USB is defined */
static struct usb_hub_device hub_dev[USB_MAX_HUB];
static int usb_hub_index;
static LIST_HEAD(usb_scan_list);

__weak void usb_hub_reset_devices(int port)
{
	return;
}

static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
		USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
}

static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
				port, NULL, 0, USB_CNTL_TIMEOUT);
}

static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
				port, NULL, 0, USB_CNTL_TIMEOUT);
}

static int usb_get_hub_status(struct usb_device *dev, void *data)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
			data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
}

int usb_get_port_status(struct usb_device *dev, int port, void *data)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
			data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
}


static void usb_hub_power_on(struct usb_hub_device *hub)
{
	int i;
	struct usb_device *dev;
	unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
	const char *env;

	dev = hub->pusb_dev;

	debug("enabling power on all ports\n");
	for (i = 0; i < dev->maxchild; i++) {
		usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
		debug("port %d returns %lX\n", i + 1, dev->status);
	}

#ifdef CONFIG_SANDBOX
	/*
	 * Don't set timeout / delay values here. This results
	 * in these values still being reset to 0.
	 */
	if (state_get_skip_delays())
		return;
#endif

	/*
	 * Wait for power to become stable,
	 * plus spec-defined max time for device to connect
	 * but allow this time to be increased via env variable as some
	 * devices break the spec and require longer warm-up times
	 */
	env = getenv("usb_pgood_delay");
	if (env)
		pgood_delay = max(pgood_delay,
			          (unsigned)simple_strtol(env, NULL, 0));
	debug("pgood_delay=%dms\n", pgood_delay);

	/*
	 * Do a minimum delay of the larger value of 100ms or pgood_delay
	 * so that the power can stablize before the devices are queried
	 */
	hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);

	/*
	 * Record the power-on timeout here. The max. delay (timeout)
	 * will be done based on this value in the USB port loop in
	 * usb_hub_configure() later.
	 */
	hub->connect_timeout = hub->query_delay + 1000;
	debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
	      dev->devnum, max(100, (int)pgood_delay),
	      max(100, (int)pgood_delay) + 1000);
}

void usb_hub_reset(void)
{
	usb_hub_index = 0;

	/* Zero out global hub_dev in case its re-used again */
	memset(hub_dev, 0, sizeof(hub_dev));
}

static struct usb_hub_device *usb_hub_allocate(void)
{
	if (usb_hub_index < USB_MAX_HUB)
		return &hub_dev[usb_hub_index++];

	printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
	return NULL;
}

#define MAX_TRIES 5

static inline char *portspeed(int portstatus)
{
	char *speed_str;

	switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
	case USB_PORT_STAT_SUPER_SPEED:
		speed_str = "5 Gb/s";
		break;
	case USB_PORT_STAT_HIGH_SPEED:
		speed_str = "480 Mb/s";
		break;
	case USB_PORT_STAT_LOW_SPEED:
		speed_str = "1.5 Mb/s";
		break;
	default:
		speed_str = "12 Mb/s";
		break;
	}

	return speed_str;
}

int legacy_hub_port_reset(struct usb_device *dev, int port,
			unsigned short *portstat)
{
	int err, tries;
	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
	unsigned short portstatus, portchange;
	int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */

#ifdef CONFIG_DM_USB
	debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
	      port + 1);
#else
	debug("%s: resetting port %d...\n", __func__, port + 1);
#endif
	for (tries = 0; tries < MAX_TRIES; tries++) {
		err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
		if (err < 0)
			return err;

		mdelay(delay);

		if (usb_get_port_status(dev, port + 1, portsts) < 0) {
			debug("get_port_status failed status %lX\n",
			      dev->status);
			return -1;
		}
		portstatus = le16_to_cpu(portsts->wPortStatus);
		portchange = le16_to_cpu(portsts->wPortChange);

		debug("portstatus %x, change %x, %s\n", portstatus, portchange,
							portspeed(portstatus));

		debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
		      "  USB_PORT_STAT_ENABLE %d\n",
		      (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
		      (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
		      (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);

		/*
		 * Perhaps we should check for the following here:
		 * - C_CONNECTION hasn't been set.
		 * - CONNECTION is still set.
		 *
		 * Doing so would ensure that the device is still connected
		 * to the bus, and hasn't been unplugged or replaced while the
		 * USB bus reset was going on.
		 *
		 * However, if we do that, then (at least) a San Disk Ultra
		 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
		 * Tegra Jetson TK1 board. For some reason, the device appears
		 * to briefly drop off the bus when this second bus reset is
		 * executed, yet if we retry this loop, it'll eventually come
		 * back after another reset or two.
		 */

		if (portstatus & USB_PORT_STAT_ENABLE)
			break;

		/* Switch to long reset delay for the next round */
		delay = HUB_LONG_RESET_TIME;
	}

	if (tries == MAX_TRIES) {
		debug("Cannot enable port %i after %i retries, " \
		      "disabling port.\n", port + 1, MAX_TRIES);
		debug("Maybe the USB cable is bad?\n");
		return -1;
	}

	usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
	*portstat = portstatus;
	return 0;
}

#ifdef CONFIG_DM_USB
int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat)
{
	struct usb_device *udev = dev_get_parent_priv(dev);

	return legacy_hub_port_reset(udev, port, portstat);
}
#endif

int usb_hub_port_connect_change(struct usb_device *dev, int port)
{
	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
	unsigned short portstatus;
	int ret, speed;

	/* Check status */
	ret = usb_get_port_status(dev, port + 1, portsts);
	if (ret < 0) {
		debug("get_port_status failed\n");
		return ret;
	}

	portstatus = le16_to_cpu(portsts->wPortStatus);
	debug("portstatus %x, change %x, %s\n",
	      portstatus,
	      le16_to_cpu(portsts->wPortChange),
	      portspeed(portstatus));

	/* Clear the connection change status */
	usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);

	/* Disconnect any existing devices under this port */
	if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
	     (!(portstatus & USB_PORT_STAT_ENABLE))) ||
	    usb_device_has_child_on_port(dev, port)) {
		debug("usb_disconnect(&hub->children[port]);\n");
		/* Return now if nothing is connected */
		if (!(portstatus & USB_PORT_STAT_CONNECTION))
			return -ENOTCONN;
	}

	/* Reset the port */
	ret = legacy_hub_port_reset(dev, port, &portstatus);
	if (ret < 0) {
		if (ret != -ENXIO)
			printf("cannot reset port %i!?\n", port + 1);
		return ret;
	}

	switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
	case USB_PORT_STAT_SUPER_SPEED:
		speed = USB_SPEED_SUPER;
		break;
	case USB_PORT_STAT_HIGH_SPEED:
		speed = USB_SPEED_HIGH;
		break;
	case USB_PORT_STAT_LOW_SPEED:
		speed = USB_SPEED_LOW;
		break;
	default:
		speed = USB_SPEED_FULL;
		break;
	}

#ifdef CONFIG_DM_USB
	struct udevice *child;

	ret = usb_scan_device(dev->dev, port + 1, speed, &child);
#else
	struct usb_device *usb;

	ret = usb_alloc_new_device(dev->controller, &usb);
	if (ret) {
		printf("cannot create new device: ret=%d", ret);
		return ret;
	}

	dev->children[port] = usb;
	usb->speed = speed;
	usb->parent = dev;
	usb->portnr = port + 1;
	/* Run it through the hoops (find a driver, etc) */
	ret = usb_new_device(usb);
	if (ret < 0) {
		/* Woops, disable the port */
		usb_free_device(dev->controller);
		dev->children[port] = NULL;
	}
#endif
	if (ret < 0) {
		debug("hub: disabling port %d\n", port + 1);
		usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
	}

	return ret;
}

static int usb_scan_port(struct usb_device_scan *usb_scan)
{
	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
	unsigned short portstatus;
	unsigned short portchange;
	struct usb_device *dev;
	struct usb_hub_device *hub;
	int ret = 0;
	int i;

	dev = usb_scan->dev;
	hub = usb_scan->hub;
	i = usb_scan->port;

	/*
	 * Don't talk to the device before the query delay is expired.
	 * This is needed for voltages to stabalize.
	 */
	if (get_timer(0) < hub->query_delay)
		return 0;

	ret = usb_get_port_status(dev, i + 1, portsts);
	if (ret < 0) {
		debug("get_port_status failed\n");
		if (get_timer(0) >= hub->connect_timeout) {
			debug("devnum=%d port=%d: timeout\n",
			      dev->devnum, i + 1);
			/* Remove this device from scanning list */
			list_del(&usb_scan->list);
			free(usb_scan);
			return 0;
		}
		return 0;
	}

	portstatus = le16_to_cpu(portsts->wPortStatus);
	portchange = le16_to_cpu(portsts->wPortChange);
	debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);

	/* No connection change happened, wait a bit more. */
	if (!(portchange & USB_PORT_STAT_C_CONNECTION)) {
		if (get_timer(0) >= hub->connect_timeout) {
			debug("devnum=%d port=%d: timeout\n",
			      dev->devnum, i + 1);
			/* Remove this device from scanning list */
			list_del(&usb_scan->list);
			free(usb_scan);
			return 0;
		}
		return 0;
	}

	/* Test if the connection came up, and if not exit */
	if (!(portstatus & USB_PORT_STAT_CONNECTION))
		return 0;

	/* A new USB device is ready at this point */
	debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);

	usb_hub_port_connect_change(dev, i);

	if (portchange & USB_PORT_STAT_C_ENABLE) {
		debug("port %d enable change, status %x\n", i + 1, portstatus);
		usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
		/*
		 * The following hack causes a ghost device problem
		 * to Faraday EHCI
		 */
#ifndef CONFIG_USB_EHCI_FARADAY
		/*
		 * EM interference sometimes causes bad shielded USB
		 * devices to be shutdown by the hub, this hack enables
		 * them again. Works at least with mouse driver
		 */
		if (!(portstatus & USB_PORT_STAT_ENABLE) &&
		    (portstatus & USB_PORT_STAT_CONNECTION) &&
		    usb_device_has_child_on_port(dev, i)) {
			debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
			      i + 1);
			usb_hub_port_connect_change(dev, i);
		}
#endif
	}

	if (portstatus & USB_PORT_STAT_SUSPEND) {
		debug("port %d suspend change\n", i + 1);
		usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
	}

	if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
		debug("port %d over-current change\n", i + 1);
		usb_clear_port_feature(dev, i + 1,
				       USB_PORT_FEAT_C_OVER_CURRENT);
		/* Only power-on this one port */
		usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
		hub->overcurrent_count[i]++;

		/*
		 * If the max-scan-count is not reached, return without removing
		 * the device from scan-list. This will re-issue a new scan.
		 */
		if (hub->overcurrent_count[i] <=
		    PORT_OVERCURRENT_MAX_SCAN_COUNT)
			return 0;

		/* Otherwise the device will get removed */
		printf("Port %d over-current occurred %d times\n", i + 1,
		       hub->overcurrent_count[i]);
	}

	if (portchange & USB_PORT_STAT_C_RESET) {
		debug("port %d reset change\n", i + 1);
		usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
	}

	/*
	 * We're done with this device, so let's remove this device from
	 * scanning list
	 */
	list_del(&usb_scan->list);
	free(usb_scan);

	return 0;
}

static int usb_device_list_scan(void)
{
	struct usb_device_scan *usb_scan;
	struct usb_device_scan *tmp;
	static int running;
	int ret = 0;

	/* Only run this loop once for each controller */
	if (running)
		return 0;

	running = 1;

	while (1) {
		/* We're done, once the list is empty again */
		if (list_empty(&usb_scan_list))
			goto out;

		list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
			int ret;

			/* Scan this port */
			ret = usb_scan_port(usb_scan);
			if (ret)
				goto out;
		}
	}

out:
	/*
	 * This USB controller has finished scanning all its connected
	 * USB devices. Set "running" back to 0, so that other USB controllers
	 * will scan their devices too.
	 */
	running = 0;

	return ret;
}

static int usb_hub_configure(struct usb_device *dev)
{
	int i, length;
	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
	unsigned char *bitmap;
	short hubCharacteristics;
	struct usb_hub_descriptor *descriptor;
	struct usb_hub_device *hub;
	__maybe_unused struct usb_hub_status *hubsts;
	int ret;

	/* "allocate" Hub device */
	hub = usb_hub_allocate();
	if (hub == NULL)
		return -ENOMEM;
	hub->pusb_dev = dev;
	/* Get the the hub descriptor */
	ret = usb_get_hub_descriptor(dev, buffer, 4);
	if (ret < 0) {
		debug("usb_hub_configure: failed to get hub " \
		      "descriptor, giving up %lX\n", dev->status);
		return ret;
	}
	descriptor = (struct usb_hub_descriptor *)buffer;

	length = min_t(int, descriptor->bLength,
		       sizeof(struct usb_hub_descriptor));

	ret = usb_get_hub_descriptor(dev, buffer, length);
	if (ret < 0) {
		debug("usb_hub_configure: failed to get hub " \
		      "descriptor 2nd giving up %lX\n", dev->status);
		return ret;
	}
	memcpy((unsigned char *)&hub->desc, buffer, length);
	/* adjust 16bit values */
	put_unaligned(le16_to_cpu(get_unaligned(
			&descriptor->wHubCharacteristics)),
			&hub->desc.wHubCharacteristics);
	/* set the bitmap */
	bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
	/* devices not removable by default */
	memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
	bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
	memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */

	for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
		hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];

	for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
		hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];

	dev->maxchild = descriptor->bNbrPorts;
	debug("%d ports detected\n", dev->maxchild);

	hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
	switch (hubCharacteristics & HUB_CHAR_LPSM) {
	case 0x00:
		debug("ganged power switching\n");
		break;
	case 0x01:
		debug("individual port power switching\n");
		break;
	case 0x02:
	case 0x03:
		debug("unknown reserved power switching mode\n");
		break;
	}

	if (hubCharacteristics & HUB_CHAR_COMPOUND)
		debug("part of a compound device\n");
	else
		debug("standalone hub\n");

	switch (hubCharacteristics & HUB_CHAR_OCPM) {
	case 0x00:
		debug("global over-current protection\n");
		break;
	case 0x08:
		debug("individual port over-current protection\n");
		break;
	case 0x10:
	case 0x18:
		debug("no over-current protection\n");
		break;
	}

	debug("power on to power good time: %dms\n",
	      descriptor->bPwrOn2PwrGood * 2);
	debug("hub controller current requirement: %dmA\n",
	      descriptor->bHubContrCurrent);

	for (i = 0; i < dev->maxchild; i++)
		debug("port %d is%s removable\n", i + 1,
		      hub->desc.DeviceRemovable[(i + 1) / 8] & \
		      (1 << ((i + 1) % 8)) ? " not" : "");

	if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
		debug("usb_hub_configure: failed to get Status - " \
		      "too long: %d\n", descriptor->bLength);
		return -EFBIG;
	}

	ret = usb_get_hub_status(dev, buffer);
	if (ret < 0) {
		debug("usb_hub_configure: failed to get Status %lX\n",
		      dev->status);
		return ret;
	}

#ifdef DEBUG
	hubsts = (struct usb_hub_status *)buffer;
#endif

	debug("get_hub_status returned status %X, change %X\n",
	      le16_to_cpu(hubsts->wHubStatus),
	      le16_to_cpu(hubsts->wHubChange));
	debug("local power source is %s\n",
	      (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
	      "lost (inactive)" : "good");
	debug("%sover-current condition exists\n",
	      (le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
	      "" : "no ");
	usb_hub_power_on(hub);

	/*
	 * Reset any devices that may be in a bad state when applying
	 * the power.  This is a __weak function.  Resetting of the devices
	 * should occur in the board file of the device.
	 */
	for (i = 0; i < dev->maxchild; i++)
		usb_hub_reset_devices(i + 1);

	/*
	 * Only add the connected USB devices, including potential hubs,
	 * to a scanning list. This list will get scanned and devices that
	 * are detected (either via port connected or via port timeout)
	 * will get removed from this list. Scanning of the devices on this
	 * list will continue until all devices are removed.
	 */
	for (i = 0; i < dev->maxchild; i++) {
		struct usb_device_scan *usb_scan;

		usb_scan = calloc(1, sizeof(*usb_scan));
		if (!usb_scan) {
			printf("Can't allocate memory for USB device!\n");
			return -ENOMEM;
		}
		usb_scan->dev = dev;
		usb_scan->hub = hub;
		usb_scan->port = i;
		list_add_tail(&usb_scan->list, &usb_scan_list);
	}

	/*
	 * And now call the scanning code which loops over the generated list
	 */
	ret = usb_device_list_scan();

	return ret;
}

static int usb_hub_check(struct usb_device *dev, int ifnum)
{
	struct usb_interface *iface;
	struct usb_endpoint_descriptor *ep = NULL;

	iface = &dev->config.if_desc[ifnum];
	/* Is it a hub? */
	if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
		goto err;
	/* Some hubs have a subclass of 1, which AFAICT according to the */
	/*  specs is not defined, but it works */
	if ((iface->desc.bInterfaceSubClass != 0) &&
	    (iface->desc.bInterfaceSubClass != 1))
		goto err;
	/* Multiple endpoints? What kind of mutant ninja-hub is this? */
	if (iface->desc.bNumEndpoints != 1)
		goto err;
	ep = &iface->ep_desc[0];
	/* Output endpoint? Curiousier and curiousier.. */
	if (!(ep->bEndpointAddress & USB_DIR_IN))
		goto err;
	/* If it's not an interrupt endpoint, we'd better punt! */
	if ((ep->bmAttributes & 3) != 3)
		goto err;
	/* We found a hub */
	debug("USB hub found\n");
	return 0;

err:
	debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
	      iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
	      iface->desc.bNumEndpoints);
	if (ep) {
		debug("   bEndpointAddress=%#x, bmAttributes=%d",
		      ep->bEndpointAddress, ep->bmAttributes);
	}

	return -ENOENT;
}

int usb_hub_probe(struct usb_device *dev, int ifnum)
{
	int ret;

	ret = usb_hub_check(dev, ifnum);
	if (ret)
		return 0;
	ret = usb_hub_configure(dev);
	return ret;
}

#ifdef CONFIG_DM_USB
int usb_hub_scan(struct udevice *hub)
{
	struct usb_device *udev = dev_get_parent_priv(hub);

	return usb_hub_configure(udev);
}

static int usb_hub_post_bind(struct udevice *dev)
{
	/* Scan the bus for devices */
	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
}

static int usb_hub_post_probe(struct udevice *dev)
{
	debug("%s\n", __func__);
	return usb_hub_scan(dev);
}

static const struct udevice_id usb_hub_ids[] = {
	{ .compatible = "usb-hub" },
	{ }
};

U_BOOT_DRIVER(usb_generic_hub) = {
	.name	= "usb_hub",
	.id	= UCLASS_USB_HUB,
	.of_match = usb_hub_ids,
	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
};

UCLASS_DRIVER(usb_hub) = {
	.id		= UCLASS_USB_HUB,
	.name		= "usb_hub",
	.post_bind	= usb_hub_post_bind,
	.post_probe	= usb_hub_post_probe,
	.child_pre_probe	= usb_child_pre_probe,
	.per_child_auto_alloc_size = sizeof(struct usb_device),
	.per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
};

static const struct usb_device_id hub_id_table[] = {
	{
		.match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
		.bDeviceClass = USB_CLASS_HUB
	},
	{ }	/* Terminating entry */
};

U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);

#endif
OpenPOWER on IntegriCloud