summaryrefslogtreecommitdiff
path: root/drivers/usb/otg/ab8500-usb.c
blob: d14736b3107b070b6ee3ee2ef82fdddb9f2219d4 (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
/*
 * drivers/usb/otg/ab8500_usb.c
 *
 * USB transceiver driver for AB8500 chip
 *
 * Copyright (C) 2010 ST-Ericsson AB
 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/otg.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/ab8500.h>

#define AB8500_MAIN_WD_CTRL_REG 0x01
#define AB8500_USB_LINE_STAT_REG 0x80
#define AB8500_USB_PHY_CTRL_REG 0x8A

#define AB8500_BIT_OTG_STAT_ID (1 << 0)
#define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
#define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
#define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
#define AB8500_BIT_WD_CTRL_KICK (1 << 1)

#define AB8500_V1x_LINK_STAT_WAIT (HZ/10)
#define AB8500_WD_KICK_DELAY_US 100 /* usec */
#define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
#define AB8500_WD_V10_DISABLE_DELAY_MS 100 /* ms */

/* Usb line status register */
enum ab8500_usb_link_status {
	USB_LINK_NOT_CONFIGURED = 0,
	USB_LINK_STD_HOST_NC,
	USB_LINK_STD_HOST_C_NS,
	USB_LINK_STD_HOST_C_S,
	USB_LINK_HOST_CHG_NM,
	USB_LINK_HOST_CHG_HS,
	USB_LINK_HOST_CHG_HS_CHIRP,
	USB_LINK_DEDICATED_CHG,
	USB_LINK_ACA_RID_A,
	USB_LINK_ACA_RID_B,
	USB_LINK_ACA_RID_C_NM,
	USB_LINK_ACA_RID_C_HS,
	USB_LINK_ACA_RID_C_HS_CHIRP,
	USB_LINK_HM_IDGND,
	USB_LINK_RESERVED,
	USB_LINK_NOT_VALID_LINK
};

struct ab8500_usb {
	struct otg_transceiver otg;
	struct device *dev;
	int irq_num_id_rise;
	int irq_num_id_fall;
	int irq_num_vbus_rise;
	int irq_num_vbus_fall;
	int irq_num_link_status;
	unsigned vbus_draw;
	struct delayed_work dwork;
	struct work_struct phy_dis_work;
	unsigned long link_status_wait;
	int rev;
};

static inline struct ab8500_usb *xceiv_to_ab(struct otg_transceiver *x)
{
	return container_of(x, struct ab8500_usb, otg);
}

static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
{
	abx500_set_register_interruptible(ab->dev,
		AB8500_SYS_CTRL2_BLOCK,
		AB8500_MAIN_WD_CTRL_REG,
		AB8500_BIT_WD_CTRL_ENABLE);

	udelay(AB8500_WD_KICK_DELAY_US);

	abx500_set_register_interruptible(ab->dev,
		AB8500_SYS_CTRL2_BLOCK,
		AB8500_MAIN_WD_CTRL_REG,
		(AB8500_BIT_WD_CTRL_ENABLE
		| AB8500_BIT_WD_CTRL_KICK));

	if (ab->rev > 0x10) /* v1.1 v2.0 */
		udelay(AB8500_WD_V11_DISABLE_DELAY_US);
	else /* v1.0 */
		msleep(AB8500_WD_V10_DISABLE_DELAY_MS);

	abx500_set_register_interruptible(ab->dev,
		AB8500_SYS_CTRL2_BLOCK,
		AB8500_MAIN_WD_CTRL_REG,
		0);
}

static void ab8500_usb_phy_ctrl(struct ab8500_usb *ab, bool sel_host,
					bool enable)
{
	u8 ctrl_reg;
	abx500_get_register_interruptible(ab->dev,
				AB8500_USB,
				AB8500_USB_PHY_CTRL_REG,
				&ctrl_reg);
	if (sel_host) {
		if (enable)
			ctrl_reg |= AB8500_BIT_PHY_CTRL_HOST_EN;
		else
			ctrl_reg &= ~AB8500_BIT_PHY_CTRL_HOST_EN;
	} else {
		if (enable)
			ctrl_reg |= AB8500_BIT_PHY_CTRL_DEVICE_EN;
		else
			ctrl_reg &= ~AB8500_BIT_PHY_CTRL_DEVICE_EN;
	}

	abx500_set_register_interruptible(ab->dev,
				AB8500_USB,
				AB8500_USB_PHY_CTRL_REG,
				ctrl_reg);

	/* Needed to enable the phy.*/
	if (enable)
		ab8500_usb_wd_workaround(ab);
}

#define ab8500_usb_host_phy_en(ab)	ab8500_usb_phy_ctrl(ab, true, true)
#define ab8500_usb_host_phy_dis(ab)	ab8500_usb_phy_ctrl(ab, true, false)
#define ab8500_usb_peri_phy_en(ab)	ab8500_usb_phy_ctrl(ab, false, true)
#define ab8500_usb_peri_phy_dis(ab)	ab8500_usb_phy_ctrl(ab, false, false)

static int ab8500_usb_link_status_update(struct ab8500_usb *ab)
{
	u8 reg;
	enum ab8500_usb_link_status lsts;
	void *v = NULL;
	enum usb_xceiv_events event;

	abx500_get_register_interruptible(ab->dev,
			AB8500_USB,
			AB8500_USB_LINE_STAT_REG,
			&reg);

	lsts = (reg >> 3) & 0x0F;

	switch (lsts) {
	case USB_LINK_NOT_CONFIGURED:
	case USB_LINK_RESERVED:
	case USB_LINK_NOT_VALID_LINK:
		/* TODO: Disable regulators. */
		ab8500_usb_host_phy_dis(ab);
		ab8500_usb_peri_phy_dis(ab);
		ab->otg.state = OTG_STATE_B_IDLE;
		ab->otg.default_a = false;
		ab->vbus_draw = 0;
		event = USB_EVENT_NONE;
		break;

	case USB_LINK_STD_HOST_NC:
	case USB_LINK_STD_HOST_C_NS:
	case USB_LINK_STD_HOST_C_S:
	case USB_LINK_HOST_CHG_NM:
	case USB_LINK_HOST_CHG_HS:
	case USB_LINK_HOST_CHG_HS_CHIRP:
		if (ab->otg.gadget) {
			/* TODO: Enable regulators. */
			ab8500_usb_peri_phy_en(ab);
			v = ab->otg.gadget;
		}
		event = USB_EVENT_VBUS;
		break;

	case USB_LINK_HM_IDGND:
		if (ab->otg.host) {
			/* TODO: Enable regulators. */
			ab8500_usb_host_phy_en(ab);
			v = ab->otg.host;
		}
		ab->otg.state = OTG_STATE_A_IDLE;
		ab->otg.default_a = true;
		event = USB_EVENT_ID;
		break;

	case USB_LINK_ACA_RID_A:
	case USB_LINK_ACA_RID_B:
		/* TODO */
	case USB_LINK_ACA_RID_C_NM:
	case USB_LINK_ACA_RID_C_HS:
	case USB_LINK_ACA_RID_C_HS_CHIRP:
	case USB_LINK_DEDICATED_CHG:
		/* TODO: vbus_draw */
		event = USB_EVENT_CHARGER;
		break;
	}

	blocking_notifier_call_chain(&ab->otg.notifier, event, v);

	return 0;
}

static void ab8500_usb_delayed_work(struct work_struct *work)
{
	struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
						dwork.work);

	ab8500_usb_link_status_update(ab);
}

static irqreturn_t ab8500_usb_v1x_common_irq(int irq, void *data)
{
	struct ab8500_usb *ab = (struct ab8500_usb *) data;

	/* Wait for link status to become stable. */
	schedule_delayed_work(&ab->dwork, ab->link_status_wait);

	return IRQ_HANDLED;
}

static irqreturn_t ab8500_usb_v1x_vbus_fall_irq(int irq, void *data)
{
	struct ab8500_usb *ab = (struct ab8500_usb *) data;

	/* Link status will not be updated till phy is disabled. */
	ab8500_usb_peri_phy_dis(ab);

	/* Wait for link status to become stable. */
	schedule_delayed_work(&ab->dwork, ab->link_status_wait);

	return IRQ_HANDLED;
}

static irqreturn_t ab8500_usb_v20_irq(int irq, void *data)
{
	struct ab8500_usb *ab = (struct ab8500_usb *) data;

	ab8500_usb_link_status_update(ab);

	return IRQ_HANDLED;
}

static void ab8500_usb_phy_disable_work(struct work_struct *work)
{
	struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
						phy_dis_work);

	if (!ab->otg.host)
		ab8500_usb_host_phy_dis(ab);

	if (!ab->otg.gadget)
		ab8500_usb_peri_phy_dis(ab);
}

static int ab8500_usb_set_power(struct otg_transceiver *otg, unsigned mA)
{
	struct ab8500_usb *ab;

	if (!otg)
		return -ENODEV;

	ab = xceiv_to_ab(otg);

	ab->vbus_draw = mA;

	if (mA)
		blocking_notifier_call_chain(&ab->otg.notifier,
				USB_EVENT_ENUMERATED, ab->otg.gadget);
	return 0;
}

/* TODO: Implement some way for charging or other drivers to read
 * ab->vbus_draw.
 */

static int ab8500_usb_set_suspend(struct otg_transceiver *x, int suspend)
{
	/* TODO */
	return 0;
}

static int ab8500_usb_set_peripheral(struct otg_transceiver *otg,
		struct usb_gadget *gadget)
{
	struct ab8500_usb *ab;

	if (!otg)
		return -ENODEV;

	ab = xceiv_to_ab(otg);

	/* Some drivers call this function in atomic context.
	 * Do not update ab8500 registers directly till this
	 * is fixed.
	 */

	if (!gadget) {
		/* TODO: Disable regulators. */
		ab->otg.gadget = NULL;
		schedule_work(&ab->phy_dis_work);
	} else {
		ab->otg.gadget = gadget;
		ab->otg.state = OTG_STATE_B_IDLE;

		/* Phy will not be enabled if cable is already
		 * plugged-in. Schedule to enable phy.
		 * Use same delay to avoid any race condition.
		 */
		schedule_delayed_work(&ab->dwork, ab->link_status_wait);
	}

	return 0;
}

static int ab8500_usb_set_host(struct otg_transceiver *otg,
					struct usb_bus *host)
{
	struct ab8500_usb *ab;

	if (!otg)
		return -ENODEV;

	ab = xceiv_to_ab(otg);

	/* Some drivers call this function in atomic context.
	 * Do not update ab8500 registers directly till this
	 * is fixed.
	 */

	if (!host) {
		/* TODO: Disable regulators. */
		ab->otg.host = NULL;
		schedule_work(&ab->phy_dis_work);
	} else {
		ab->otg.host = host;
		/* Phy will not be enabled if cable is already
		 * plugged-in. Schedule to enable phy.
		 * Use same delay to avoid any race condition.
		 */
		schedule_delayed_work(&ab->dwork, ab->link_status_wait);
	}

	return 0;
}

static void ab8500_usb_irq_free(struct ab8500_usb *ab)
{
	if (ab->rev < 0x20) {
		free_irq(ab->irq_num_id_rise, ab);
		free_irq(ab->irq_num_id_fall, ab);
		free_irq(ab->irq_num_vbus_rise, ab);
		free_irq(ab->irq_num_vbus_fall, ab);
	} else {
		free_irq(ab->irq_num_link_status, ab);
	}
}

static int ab8500_usb_v1x_res_setup(struct platform_device *pdev,
				struct ab8500_usb *ab)
{
	int err;

	ab->irq_num_id_rise = platform_get_irq_byname(pdev, "ID_WAKEUP_R");
	if (ab->irq_num_id_rise < 0) {
		dev_err(&pdev->dev, "ID rise irq not found\n");
		return ab->irq_num_id_rise;
	}
	err = request_threaded_irq(ab->irq_num_id_rise, NULL,
		ab8500_usb_v1x_common_irq,
		IRQF_NO_SUSPEND | IRQF_SHARED,
		"usb-id-rise", ab);
	if (err < 0) {
		dev_err(ab->dev, "request_irq failed for ID rise irq\n");
		goto fail0;
	}

	ab->irq_num_id_fall = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
	if (ab->irq_num_id_fall < 0) {
		dev_err(&pdev->dev, "ID fall irq not found\n");
		return ab->irq_num_id_fall;
	}
	err = request_threaded_irq(ab->irq_num_id_fall, NULL,
		ab8500_usb_v1x_common_irq,
		IRQF_NO_SUSPEND | IRQF_SHARED,
		"usb-id-fall", ab);
	if (err < 0) {
		dev_err(ab->dev, "request_irq failed for ID fall irq\n");
		goto fail1;
	}

	ab->irq_num_vbus_rise = platform_get_irq_byname(pdev, "VBUS_DET_R");
	if (ab->irq_num_vbus_rise < 0) {
		dev_err(&pdev->dev, "VBUS rise irq not found\n");
		return ab->irq_num_vbus_rise;
	}
	err = request_threaded_irq(ab->irq_num_vbus_rise, NULL,
		ab8500_usb_v1x_common_irq,
		IRQF_NO_SUSPEND | IRQF_SHARED,
		"usb-vbus-rise", ab);
	if (err < 0) {
		dev_err(ab->dev, "request_irq failed for Vbus rise irq\n");
		goto fail2;
	}

	ab->irq_num_vbus_fall = platform_get_irq_byname(pdev, "VBUS_DET_F");
	if (ab->irq_num_vbus_fall < 0) {
		dev_err(&pdev->dev, "VBUS fall irq not found\n");
		return ab->irq_num_vbus_fall;
	}
	err = request_threaded_irq(ab->irq_num_vbus_fall, NULL,
		ab8500_usb_v1x_vbus_fall_irq,
		IRQF_NO_SUSPEND | IRQF_SHARED,
		"usb-vbus-fall", ab);
	if (err < 0) {
		dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
		goto fail3;
	}

	return 0;
fail3:
	free_irq(ab->irq_num_vbus_rise, ab);
fail2:
	free_irq(ab->irq_num_id_fall, ab);
fail1:
	free_irq(ab->irq_num_id_rise, ab);
fail0:
	return err;
}

static int ab8500_usb_v2_res_setup(struct platform_device *pdev,
				struct ab8500_usb *ab)
{
	int err;

	ab->irq_num_link_status = platform_get_irq_byname(pdev,
						"USB_LINK_STATUS");
	if (ab->irq_num_link_status < 0) {
		dev_err(&pdev->dev, "Link status irq not found\n");
		return ab->irq_num_link_status;
	}

	err = request_threaded_irq(ab->irq_num_link_status, NULL,
		ab8500_usb_v20_irq,
		IRQF_NO_SUSPEND | IRQF_SHARED,
		"usb-link-status", ab);
	if (err < 0) {
		dev_err(ab->dev,
			"request_irq failed for link status irq\n");
		return err;
	}

	return 0;
}

static int __devinit ab8500_usb_probe(struct platform_device *pdev)
{
	struct ab8500_usb	*ab;
	int err;
	int rev;

	rev = abx500_get_chip_id(&pdev->dev);
	if (rev < 0) {
		dev_err(&pdev->dev, "Chip id read failed\n");
		return rev;
	} else if (rev < 0x10) {
		dev_err(&pdev->dev, "Unsupported AB8500 chip\n");
		return -ENODEV;
	}

	ab = kzalloc(sizeof *ab, GFP_KERNEL);
	if (!ab)
		return -ENOMEM;

	ab->dev			= &pdev->dev;
	ab->rev			= rev;
	ab->otg.dev		= ab->dev;
	ab->otg.label		= "ab8500";
	ab->otg.state		= OTG_STATE_UNDEFINED;
	ab->otg.set_host	= ab8500_usb_set_host;
	ab->otg.set_peripheral	= ab8500_usb_set_peripheral;
	ab->otg.set_suspend	= ab8500_usb_set_suspend;
	ab->otg.set_power	= ab8500_usb_set_power;

	platform_set_drvdata(pdev, ab);

	BLOCKING_INIT_NOTIFIER_HEAD(&ab->otg.notifier);

	/* v1: Wait for link status to become stable.
	 * all: Updates form set_host and set_peripheral as they are atomic.
	 */
	INIT_DELAYED_WORK(&ab->dwork, ab8500_usb_delayed_work);

	/* all: Disable phy when called from set_host and set_peripheral */
	INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);

	if (ab->rev < 0x20) {
		err = ab8500_usb_v1x_res_setup(pdev, ab);
		ab->link_status_wait = AB8500_V1x_LINK_STAT_WAIT;
	} else {
		err = ab8500_usb_v2_res_setup(pdev, ab);
	}

	if (err < 0)
		goto fail0;

	err = otg_set_transceiver(&ab->otg);
	if (err) {
		dev_err(&pdev->dev, "Can't register transceiver\n");
		goto fail1;
	}

	dev_info(&pdev->dev, "AB8500 usb driver initialized\n");

	return 0;
fail1:
	ab8500_usb_irq_free(ab);
fail0:
	kfree(ab);
	return err;
}

static int __devexit ab8500_usb_remove(struct platform_device *pdev)
{
	struct ab8500_usb *ab = platform_get_drvdata(pdev);

	ab8500_usb_irq_free(ab);

	cancel_delayed_work_sync(&ab->dwork);

	cancel_work_sync(&ab->phy_dis_work);

	otg_set_transceiver(NULL);

	ab8500_usb_host_phy_dis(ab);
	ab8500_usb_peri_phy_dis(ab);

	platform_set_drvdata(pdev, NULL);

	kfree(ab);

	return 0;
}

static struct platform_driver ab8500_usb_driver = {
	.probe		= ab8500_usb_probe,
	.remove		= __devexit_p(ab8500_usb_remove),
	.driver		= {
		.name	= "ab8500-usb",
		.owner	= THIS_MODULE,
	},
};

static int __init ab8500_usb_init(void)
{
	return platform_driver_register(&ab8500_usb_driver);
}
subsys_initcall(ab8500_usb_init);

static void __exit ab8500_usb_exit(void)
{
	platform_driver_unregister(&ab8500_usb_driver);
}
module_exit(ab8500_usb_exit);

MODULE_ALIAS("platform:ab8500_usb");
MODULE_AUTHOR("ST-Ericsson AB");
MODULE_DESCRIPTION("AB8500 usb transceiver driver");
MODULE_LICENSE("GPL");