aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/musb/ux500.c
blob: 59256b12f7469fe9170ec0fa7db0bee3cbbed6da (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
/*
 * Copyright (C) 2010 ST-Ericsson AB
 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
 *
 * Based on omap2430.c
 *
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/usb/musb-ux500.h>

#include "musb_core.h"

static struct musb_hdrc_config ux500_musb_hdrc_config = {
	.multipoint	= true,
	.dyn_fifo	= true,
	.num_eps	= 16,
	.ram_bits	= 16,
};

struct ux500_glue {
	struct device		*dev;
	struct platform_device	*musb;
	struct clk		*clk;
};
#define glue_to_musb(g)	platform_get_drvdata(g->musb)

static void ux500_musb_set_vbus(struct musb *musb, int is_on)
{
	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->state == OTG_STATE_A_IDLE) {
			/* 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) & 0x80) {

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

		} else {
			musb->is_active = 1;
			musb->xceiv->otg->default_a = 1;
			musb->xceiv->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->default_a = 0;
		devctl &= ~MUSB_DEVCTL_SESSION;
		MUSB_DEV_MODE(musb);
	}
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

	/*
	 * Devctl values will be updated after vbus goes below
	 * session_valid. The time taken depends on the capacitance
	 * on VBUS line. The max discharge time can be upto 1 sec
	 * as per the spec. Typically on our platform, it is 200ms
	 */
	if (!is_on)
		mdelay(200);

	dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
		usb_otg_state_string(musb->xceiv->state),
		musb_readb(musb->mregs, MUSB_DEVCTL));
}

static int musb_otg_notifications(struct notifier_block *nb,
		unsigned long event, void *unused)
{
	struct musb *musb = container_of(nb, struct musb, nb);

	dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
			event, usb_otg_state_string(musb->xceiv->state));

	switch (event) {
	case UX500_MUSB_ID:
		dev_dbg(musb->controller, "ID GND\n");
		ux500_musb_set_vbus(musb, 1);
		break;
	case UX500_MUSB_VBUS:
		dev_dbg(musb->controller, "VBUS Connect\n");
		break;
	case UX500_MUSB_NONE:
		dev_dbg(musb->controller, "VBUS Disconnect\n");
		if (is_host_active(musb))
			ux500_musb_set_vbus(musb, 0);
		else
			musb->xceiv->state = OTG_STATE_B_IDLE;
		break;
	default:
		dev_dbg(musb->controller, "ID float\n");
		return NOTIFY_DONE;
	}
	return NOTIFY_OK;
}

static irqreturn_t ux500_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 ux500_musb_init(struct musb *musb)
{
	int status;

	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
	if (IS_ERR_OR_NULL(musb->xceiv)) {
		pr_err("HS USB OTG: no transceiver configured\n");
		return -EPROBE_DEFER;
	}

	musb->nb.notifier_call = musb_otg_notifications;
	status = usb_register_notifier(musb->xceiv, &musb->nb);
	if (status < 0) {
		dev_dbg(musb->controller, "notification register failed\n");
		return status;
	}

	musb->isr = ux500_musb_interrupt;

	return 0;
}

static int ux500_musb_exit(struct musb *musb)
{
	usb_unregister_notifier(musb->xceiv, &musb->nb);

	usb_put_phy(musb->xceiv);

	return 0;
}

static const struct musb_platform_ops ux500_ops = {
	.init		= ux500_musb_init,
	.exit		= ux500_musb_exit,

	.set_vbus	= ux500_musb_set_vbus,
};

static struct musb_hdrc_platform_data *
ux500_of_probe(struct platform_device *pdev, struct device_node *np)
{
	struct musb_hdrc_platform_data *pdata;
	const char *mode;
	int strlen;

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

	mode = of_get_property(np, "dr_mode", &strlen);
	if (!mode) {
		dev_err(&pdev->dev, "No 'dr_mode' property found\n");
		return NULL;
	}

	if (strlen > 0) {
		if (!strcmp(mode, "host"))
			pdata->mode = MUSB_HOST;
		if (!strcmp(mode, "otg"))
			pdata->mode = MUSB_OTG;
		if (!strcmp(mode, "peripheral"))
			pdata->mode = MUSB_PERIPHERAL;
	}

	return pdata;
}

static int ux500_probe(struct platform_device *pdev)
{
	struct resource musb_resources[2];
	struct musb_hdrc_platform_data	*pdata = dev_get_platdata(&pdev->dev);
	struct device_node		*np = pdev->dev.of_node;
	struct platform_device		*musb;
	struct ux500_glue		*glue;
	struct clk			*clk;
	int				ret = -ENOMEM;

	if (!pdata) {
		if (np) {
			pdata = ux500_of_probe(pdev, np);
			if (!pdata)
				goto err0;

			pdev->dev.platform_data = pdata;
		} else {
			dev_err(&pdev->dev, "no pdata or device tree found\n");
			goto err0;
		}
	}

	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
	if (!glue) {
		dev_err(&pdev->dev, "failed to allocate glue context\n");
		goto err0;
	}

	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
	if (!musb) {
		dev_err(&pdev->dev, "failed to allocate musb device\n");
		goto err1;
	}

	clk = clk_get(&pdev->dev, "usb");
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		ret = PTR_ERR(clk);
		goto err3;
	}

	ret = clk_prepare_enable(clk);
	if (ret) {
		dev_err(&pdev->dev, "failed to enable clock\n");
		goto err4;
	}

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

	glue->dev			= &pdev->dev;
	glue->musb			= musb;
	glue->clk			= clk;

	pdata->platform_ops		= &ux500_ops;
	pdata->config 			= &ux500_musb_hdrc_config;

	platform_set_drvdata(pdev, glue);

	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;

	ret = platform_device_add_resources(musb, musb_resources,
			ARRAY_SIZE(musb_resources));
	if (ret) {
		dev_err(&pdev->dev, "failed to add resources\n");
		goto err5;
	}

	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	if (ret) {
		dev_err(&pdev->dev, "failed to add platform_data\n");
		goto err5;
	}

	ret = platform_device_add(musb);
	if (ret) {
		dev_err(&pdev->dev, "failed to register musb device\n");
		goto err5;
	}

	return 0;

err5:
	clk_disable_unprepare(clk);

err4:
	clk_put(clk);

err3:
	platform_device_put(musb);

err1:
	kfree(glue);

err0:
	return ret;
}

static int ux500_remove(struct platform_device *pdev)
{
	struct ux500_glue	*glue = platform_get_drvdata(pdev);

	platform_device_unregister(glue->musb);
	clk_disable_unprepare(glue->clk);
	clk_put(glue->clk);
	kfree(glue);

	return 0;
}

#ifdef CONFIG_PM
static int ux500_suspend(struct device *dev)
{
	struct ux500_glue	*glue = dev_get_drvdata(dev);
	struct musb		*musb = glue_to_musb(glue);

	usb_phy_set_suspend(musb->xceiv, 1);
	clk_disable_unprepare(glue->clk);

	return 0;
}

static int ux500_resume(struct device *dev)
{
	struct ux500_glue	*glue = dev_get_drvdata(dev);
	struct musb		*musb = glue_to_musb(glue);
	int			ret;

	ret = clk_prepare_enable(glue->clk);
	if (ret) {
		dev_err(dev, "failed to enable clock\n");
		return ret;
	}

	usb_phy_set_suspend(musb->xceiv, 0);

	return 0;
}

static const struct dev_pm_ops ux500_pm_ops = {
	.suspend	= ux500_suspend,
	.resume		= ux500_resume,
};

#define DEV_PM_OPS	(&ux500_pm_ops)
#else
#define DEV_PM_OPS	NULL
#endif

static const struct of_device_id ux500_match[] = {
        { .compatible = "stericsson,db8500-musb", },
        {}
};

static struct platform_driver ux500_driver = {
	.probe		= ux500_probe,
	.remove		= ux500_remove,
	.driver		= {
		.name	= "musb-ux500",
		.pm	= DEV_PM_OPS,
		.of_match_table = ux500_match,
	},
};

MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
MODULE_LICENSE("GPL v2");
module_platform_driver(ux500_driver);

Privacy Policy