summaryrefslogtreecommitdiffstats
path: root/drivers/usb/musb/omap2430.c
blob: a3d2fef6774682fdab89883907060fcbc81c93d0 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2005-2007 by Texas Instruments
 * Some code has been taken from tusb6010.c
 * Copyrights for that are attributable to:
 * Copyright (C) 2006 Nokia Corporation
 * Tony Lindgren <tony@atomide.com>
 *
 * This file is part of the Inventra Controller Driver for Linux.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/pm_runtime.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/usb/musb.h>
#include <linux/phy/omap_control_phy.h>
#include <linux/of_platform.h>

#include "musb_core.h"
#include "omap2430.h"

struct omap2430_glue {
	struct device		*dev;
	struct platform_device	*musb;
	enum musb_vbus_id_status status;
	struct work_struct	omap_musb_mailbox_work;
	struct device		*control_otghs;
};
#define glue_to_musb(g)		platform_get_drvdata(g->musb)

static struct omap2430_glue	*_glue;

static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
{
	struct usb_otg	*otg = musb->xceiv->otg;
	u8		devctl;
	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
	/* HDRC controls CPEN, but beware current surges during device
	 * connect.  They can trigger transient overcurrent conditions
	 * that must be ignored.
	 */

	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

	if (is_on) {
		if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) {
			int loops = 100;
			/* start the session */
			devctl |= MUSB_DEVCTL_SESSION;
			musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
			/*
			 * Wait for the musb to set as A device to enable the
			 * VBUS
			 */
			while (musb_readb(musb->mregs, MUSB_DEVCTL) &
			       MUSB_DEVCTL_BDEVICE) {

				mdelay(5);
				cpu_relax();

				if (time_after(jiffies, timeout)
				    || loops-- <= 0) {
					dev_err(musb->controller,
					"configured as A device timeout");
					break;
				}
			}

			otg_set_vbus(otg, 1);
		} else {
			musb->is_active = 1;
			musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
			devctl |= MUSB_DEVCTL_SESSION;
			MUSB_HST_MODE(musb);
		}
	} else {
		musb->is_active = 0;

		/* NOTE:  we're skipping A_WAIT_VFALL -> A_IDLE and
		 * jumping right to B_IDLE...
		 */

		musb->xceiv->otg->state = OTG_STATE_B_IDLE;
		devctl &= ~MUSB_DEVCTL_SESSION;

		MUSB_DEV_MODE(musb);
	}
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

	dev_dbg(musb->controller, "VBUS %s, devctl %02x "
		/* otg %3x conf %08x prcm %08x */ "\n",
		usb_otg_state_string(musb->xceiv->otg->state),
		musb_readb(musb->mregs, MUSB_DEVCTL));
}

static inline void omap2430_low_level_exit(struct musb *musb)
{
	u32 l;

	/* in any role */
	l = musb_readl(musb->mregs, OTG_FORCESTDBY);
	l |= ENABLEFORCE;	/* enable MSTANDBY */
	musb_writel(musb->mregs, OTG_FORCESTDBY, l);
}

static inline void omap2430_low_level_init(struct musb *musb)
{
	u32 l;

	l = musb_readl(musb->mregs, OTG_FORCESTDBY);
	l &= ~ENABLEFORCE;	/* disable MSTANDBY */
	musb_writel(musb->mregs, OTG_FORCESTDBY, l);
}

static int omap2430_musb_mailbox(enum musb_vbus_id_status status)
{
	struct omap2430_glue	*glue = _glue;

	if (!glue) {
		pr_err("%s: musb core is not yet initialized\n", __func__);
		return -EPROBE_DEFER;
	}
	glue->status = status;

	if (!glue_to_musb(glue)) {
		pr_err("%s: musb core is not yet ready\n", __func__);
		return -EPROBE_DEFER;
	}

	schedule_work(&glue->omap_musb_mailbox_work);

	return 0;
}

static void omap_musb_set_mailbox(struct omap2430_glue *glue)
{
	struct musb *musb = glue_to_musb(glue);
	struct musb_hdrc_platform_data *pdata =
		dev_get_platdata(musb->controller);
	struct omap_musb_board_data *data = pdata->board_data;

	pm_runtime_get_sync(musb->controller);
	switch (glue->status) {
	case MUSB_ID_GROUND:
		dev_dbg(musb->controller, "ID GND\n");

		musb->xceiv->otg->state = OTG_STATE_A_IDLE;
		musb->xceiv->last_event = USB_EVENT_ID;
		if (musb->gadget_driver) {
			omap_control_usb_set_mode(glue->control_otghs,
				USB_MODE_HOST);
			omap2430_musb_set_vbus(musb, 1);
		}
		break;

	case MUSB_VBUS_VALID:
		dev_dbg(musb->controller, "VBUS Connect\n");

		musb->xceiv->otg->state = OTG_STATE_B_IDLE;
		musb->xceiv->last_event = USB_EVENT_VBUS;
		omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
		break;

	case MUSB_ID_FLOAT:
	case MUSB_VBUS_OFF:
		dev_dbg(musb->controller, "VBUS Disconnect\n");

		musb->xceiv->last_event = USB_EVENT_NONE;
		if (musb->gadget_driver)
			omap2430_musb_set_vbus(musb, 0);

		if (data->interface_type == MUSB_INTERFACE_UTMI)
			otg_set_vbus(musb->xceiv->otg, 0);

		omap_control_usb_set_mode(glue->control_otghs,
			USB_MODE_DISCONNECT);
		break;
	default:
		dev_dbg(musb->controller, "ID float\n");
	}
	pm_runtime_mark_last_busy(musb->controller);
	pm_runtime_put_autosuspend(musb->controller);
	atomic_notifier_call_chain(&musb->xceiv->notifier,
			musb->xceiv->last_event, NULL);
}


static void omap_musb_mailbox_work(struct work_struct *mailbox_work)
{
	struct omap2430_glue *glue = container_of(mailbox_work,
				struct omap2430_glue, omap_musb_mailbox_work);

	omap_musb_set_mailbox(glue);
}

static irqreturn_t omap2430_musb_interrupt(int irq, void *__hci)
{
	unsigned long   flags;
	irqreturn_t     retval = IRQ_NONE;
	struct musb     *musb = __hci;

	spin_lock_irqsave(&musb->lock, flags);

	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);

	if (musb->int_usb || musb->int_tx || musb->int_rx)
		retval = musb_interrupt(musb);

	spin_unlock_irqrestore(&musb->lock, flags);

	return retval;
}

static int omap2430_musb_init(struct musb *musb)
{
	u32 l;
	int status = 0;
	struct device *dev = musb->controller;
	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
	struct musb_hdrc_platform_data *plat = dev_get_platdata(dev);
	struct omap_musb_board_data *data = plat->board_data;

	/* We require some kind of external transceiver, hooked
	 * up through ULPI.  TWL4030-family PMICs include one,
	 * which needs a driver, drivers aren't always needed.
	 */
	musb->phy = devm_phy_get(dev->parent, "usb2-phy");

	/* We can't totally remove musb->xceiv as of now because
	 * musb core uses xceiv.state and xceiv.otg. Once we have
	 * a separate state machine to handle otg, these can be moved
	 * out of xceiv and then we can start using the generic PHY
	 * framework
	 */
	musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "usb-phy", 0);

	if (IS_ERR(musb->xceiv)) {
		status = PTR_ERR(musb->xceiv);

		if (status == -ENXIO)
			return status;

		dev_dbg(dev, "HS USB OTG: no transceiver configured\n");
		return -EPROBE_DEFER;
	}

	if (IS_ERR(musb->phy)) {
		dev_err(dev, "HS USB OTG: no PHY configured\n");
		return PTR_ERR(musb->phy);
	}
	musb->isr = omap2430_musb_interrupt;
	phy_init(musb->phy);
	phy_power_on(musb->phy);

	l = musb_readl(musb->mregs, OTG_INTERFSEL);

	if (data->interface_type == MUSB_INTERFACE_UTMI) {
		/* OMAP4 uses Internal PHY GS70 which uses UTMI interface */
		l &= ~ULPI_12PIN;       /* Disable ULPI */
		l |= UTMI_8BIT;         /* Enable UTMI  */
	} else {
		l |= ULPI_12PIN;
	}

	musb_writel(musb->mregs, OTG_INTERFSEL, l);

	dev_dbg(dev, "HS USB OTG: revision 0x%x, sysconfig 0x%02x, "
			"sysstatus 0x%x, intrfsel 0x%x, simenable  0x%x\n",
			musb_readl(musb->mregs, OTG_REVISION),
			musb_readl(musb->mregs, OTG_SYSCONFIG),
			musb_readl(musb->mregs, OTG_SYSSTATUS),
			musb_readl(musb->mregs, OTG_INTERFSEL),
			musb_readl(musb->mregs, OTG_SIMENABLE));

	if (glue->status != MUSB_UNKNOWN)
		omap_musb_set_mailbox(glue);

	return 0;
}

static void omap2430_musb_enable(struct musb *musb)
{
	u8		devctl;
	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
	struct device *dev = musb->controller;
	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
	struct musb_hdrc_platform_data *pdata = dev_get_platdata(dev);
	struct omap_musb_board_data *data = pdata->board_data;


	switch (glue->status) {

	case MUSB_ID_GROUND:
		omap_control_usb_set_mode(glue->control_otghs, USB_MODE_HOST);
		if (data->interface_type != MUSB_INTERFACE_UTMI)
			break;
		devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
		/* start the session */
		devctl |= MUSB_DEVCTL_SESSION;
		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
		while (musb_readb(musb->mregs, MUSB_DEVCTL) &
				MUSB_DEVCTL_BDEVICE) {
			cpu_relax();

			if (time_after(jiffies, timeout)) {
				dev_err(dev, "configured as A device timeout");
				break;
			}
		}
		break;

	case MUSB_VBUS_VALID:
		omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE);
		break;

	default:
		break;
	}
}

static void omap2430_musb_disable(struct musb *musb)
{
	struct device *dev = musb->controller;
	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);

	if (glue->status != MUSB_UNKNOWN)
		omap_control_usb_set_mode(glue->control_otghs,
			USB_MODE_DISCONNECT);
}

static int omap2430_musb_exit(struct musb *musb)
{
	struct device *dev = musb->controller;
	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);

	omap2430_low_level_exit(musb);
	phy_power_off(musb->phy);
	phy_exit(musb->phy);
	musb->phy = NULL;
	cancel_work_sync(&glue->omap_musb_mailbox_work);

	return 0;
}

static const struct musb_platform_ops omap2430_ops = {
	.quirks		= MUSB_DMA_INVENTRA,
#ifdef CONFIG_USB_INVENTRA_DMA
	.dma_init	= musbhs_dma_controller_create,
	.dma_exit	= musbhs_dma_controller_destroy,
#endif
	.init		= omap2430_musb_init,
	.exit		= omap2430_musb_exit,

	.set_vbus	= omap2430_musb_set_vbus,

	.enable		= omap2430_musb_enable,
	.disable	= omap2430_musb_disable,

	.phy_callback	= omap2430_musb_mailbox,
};

static u64 omap2430_dmamask = DMA_BIT_MASK(32);

static int omap2430_probe(struct platform_device *pdev)
{
	struct resource			musb_resources[3];
	struct musb_hdrc_platform_data	*pdata = dev_get_platdata(&pdev->dev);
	struct omap_musb_board_data	*data;
	struct platform_device		*musb;
	struct omap2430_glue		*glue;
	struct device_node		*np = pdev->dev.of_node;
	struct musb_hdrc_config		*config;
	struct device_node		*control_node;
	struct platform_device		*control_pdev;
	int				ret = -ENOMEM, val;

	if (!np)
		return -ENODEV;

	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
	if (!glue)
		goto err0;

	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
	if (!musb) {
		dev_err(&pdev->dev, "failed to allocate musb device\n");
		goto err0;
	}

	musb->dev.parent		= &pdev->dev;
	musb->dev.dma_mask		= &omap2430_dmamask;
	musb->dev.coherent_dma_mask	= omap2430_dmamask;

	glue->dev			= &pdev->dev;
	glue->musb			= musb;
	glue->status			= MUSB_UNKNOWN;
	glue->control_otghs = ERR_PTR(-ENODEV);

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		goto err2;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		goto err2;

	config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
	if (!config)
		goto err2;

	of_property_read_u32(np, "mode", (u32 *)&pdata->mode);
	of_property_read_u32(np, "interface-type",
			(u32 *)&data->interface_type);
	of_property_read_u32(np, "num-eps", (u32 *)&config->num_eps);
	of_property_read_u32(np, "ram-bits", (u32 *)&config->ram_bits);
	of_property_read_u32(np, "power", (u32 *)&pdata->power);

	ret = of_property_read_u32(np, "multipoint", &val);
	if (!ret && val)
		config->multipoint = true;

	pdata->board_data	= data;
	pdata->config		= config;

	control_node = of_parse_phandle(np, "ctrl-module", 0);
	if (control_node) {
		control_pdev = of_find_device_by_node(control_node);
		if (!control_pdev) {
			dev_err(&pdev->dev, "Failed to get control device\n");
			ret = -EINVAL;
			goto err2;
		}
		glue->control_otghs = &control_pdev->dev;
	}

	pdata->platform_ops		= &omap2430_ops;

	platform_set_drvdata(pdev, glue);

	/*
	 * REVISIT if we ever have two instances of the wrapper, we will be
	 * in big trouble
	 */
	_glue	= glue;

	INIT_WORK(&glue->omap_musb_mailbox_work, omap_musb_mailbox_work);

	memset(musb_resources, 0x00, sizeof(*musb_resources) *
			ARRAY_SIZE(musb_resources));

	musb_resources[0].name = pdev->resource[0].name;
	musb_resources[0].start = pdev->resource[0].start;
	musb_resources[0].end = pdev->resource[0].end;
	musb_resources[0].flags = pdev->resource[0].flags;

	musb_resources[1].name = pdev->resource[1].name;
	musb_resources[1].start = pdev->resource[1].start;
	musb_resources[1].end = pdev->resource[1].end;
	musb_resources[1].flags = pdev->resource[1].flags;

	musb_resources[2].name = pdev->resource[2].name;
	musb_resources[2].start = pdev->resource[2].start;
	musb_resources[2].end = pdev->resource[2].end;
	musb_resources[2].flags = pdev->resource[2].flags;

	ret = platform_device_add_resources(musb, musb_resources,
			ARRAY_SIZE(musb_resources));
	if (ret) {
		dev_err(&pdev->dev, "failed to add resources\n");
		goto err2;
	}

	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	if (ret) {
		dev_err(&pdev->dev, "failed to add platform_data\n");
		goto err2;
	}

	pm_runtime_enable(glue->dev);

	ret = platform_device_add(musb);
	if (ret) {
		dev_err(&pdev->dev, "failed to register musb device\n");
		goto err3;
	}

	return 0;

err3:
	pm_runtime_disable(glue->dev);

err2:
	platform_device_put(musb);

err0:
	return ret;
}

static int omap2430_remove(struct platform_device *pdev)
{
	struct omap2430_glue *glue = platform_get_drvdata(pdev);

	platform_device_unregister(glue->musb);
	pm_runtime_disable(glue->dev);

	return 0;
}

#ifdef CONFIG_PM

static int omap2430_runtime_suspend(struct device *dev)
{
	struct omap2430_glue		*glue = dev_get_drvdata(dev);
	struct musb			*musb = glue_to_musb(glue);

	if (!musb)
		return 0;

	musb->context.otg_interfsel = musb_readl(musb->mregs,
						 OTG_INTERFSEL);

	omap2430_low_level_exit(musb);

	phy_power_off(musb->phy);
	phy_exit(musb->phy);

	return 0;
}

static int omap2430_runtime_resume(struct device *dev)
{
	struct omap2430_glue		*glue = dev_get_drvdata(dev);
	struct musb			*musb = glue_to_musb(glue);

	if (!musb)
		return 0;

	phy_init(musb->phy);
	phy_power_on(musb->phy);

	omap2430_low_level_init(musb);
	musb_writel(musb->mregs, OTG_INTERFSEL,
		    musb->context.otg_interfsel);

	return 0;
}

static const struct dev_pm_ops omap2430_pm_ops = {
	.runtime_suspend = omap2430_runtime_suspend,
	.runtime_resume = omap2430_runtime_resume,
};

#define DEV_PM_OPS	(&omap2430_pm_ops)
#else
#define DEV_PM_OPS	NULL
#endif

#ifdef CONFIG_OF
static const struct of_device_id omap2430_id_table[] = {
	{
		.compatible = "ti,omap4-musb"
	},
	{
		.compatible = "ti,omap3-musb"
	},
	{},
};
MODULE_DEVICE_TABLE(of, omap2430_id_table);
#endif

static struct platform_driver omap2430_driver = {
	.probe		= omap2430_probe,
	.remove		= omap2430_remove,
	.driver		= {
		.name	= "musb-omap2430",
		.pm	= DEV_PM_OPS,
		.of_match_table = of_match_ptr(omap2430_id_table),
	},
};

module_platform_driver(omap2430_driver);

MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("GPL v2");