summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ehci-st.c
blob: b7c5cfa37a83501f8430837cab16fdf19b370c13 (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
/*
 * ST EHCI driver
 *
 * Copyright (C) 2014 STMicroelectronics – All Rights Reserved
 *
 * Author: Peter Griffin <peter.griffin@linaro.org>
 *
 * Derived from ehci-platform.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/hrtimer.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/ehci_pdriver.h>

#include "ehci.h"

#define USB_MAX_CLKS 3

struct st_ehci_platform_priv {
	struct clk *clks[USB_MAX_CLKS];
	struct clk *clk48;
	struct reset_control *rst;
	struct reset_control *pwr;
	struct phy *phy;
};

#define DRIVER_DESC "EHCI STMicroelectronics driver"

#define hcd_to_ehci_priv(h) \
	((struct st_ehci_platform_priv *)hcd_to_ehci(h)->priv)

static const char hcd_name[] = "ehci-st";

#define EHCI_CAPS_SIZE 0x10
#define AHB2STBUS_INSREG01 (EHCI_CAPS_SIZE + 0x84)

static int st_ehci_platform_reset(struct usb_hcd *hcd)
{
	struct platform_device *pdev = to_platform_device(hcd->self.controller);
	struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
	u32 threshold;

	/* Set EHCI packet buffer IN/OUT threshold to 128 bytes */
	threshold = 128 | (128 << 16);
	writel(threshold, hcd->regs + AHB2STBUS_INSREG01);

	ehci->caps = hcd->regs + pdata->caps_offset;
	return ehci_setup(hcd);
}

static int st_ehci_platform_power_on(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct st_ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
	int clk, ret;

	ret = reset_control_deassert(priv->pwr);
	if (ret)
		return ret;

	ret = reset_control_deassert(priv->rst);
	if (ret)
		goto err_assert_power;

	/* some SoCs don't have a dedicated 48Mhz clock, but those that do
	   need the rate to be explicitly set */
	if (priv->clk48) {
		ret = clk_set_rate(priv->clk48, 48000000);
		if (ret)
			goto err_assert_reset;
	}

	for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) {
		ret = clk_prepare_enable(priv->clks[clk]);
		if (ret)
			goto err_disable_clks;
	}

	ret = phy_init(priv->phy);
	if (ret)
		goto err_disable_clks;

	ret = phy_power_on(priv->phy);
	if (ret)
		goto err_exit_phy;

	return 0;

err_exit_phy:
	phy_exit(priv->phy);
err_disable_clks:
	while (--clk >= 0)
		clk_disable_unprepare(priv->clks[clk]);
err_assert_reset:
	reset_control_assert(priv->rst);
err_assert_power:
	reset_control_assert(priv->pwr);

	return ret;
}

static void st_ehci_platform_power_off(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct st_ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
	int clk;

	reset_control_assert(priv->pwr);

	reset_control_assert(priv->rst);

	phy_power_off(priv->phy);

	phy_exit(priv->phy);

	for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--)
		if (priv->clks[clk])
			clk_disable_unprepare(priv->clks[clk]);

}

static struct hc_driver __read_mostly ehci_platform_hc_driver;

static const struct ehci_driver_overrides platform_overrides __initconst = {
	.reset =		st_ehci_platform_reset,
	.extra_priv_size =	sizeof(struct st_ehci_platform_priv),
};

static struct usb_ehci_pdata ehci_platform_defaults = {
	.power_on =		st_ehci_platform_power_on,
	.power_suspend =	st_ehci_platform_power_off,
	.power_off =		st_ehci_platform_power_off,
};

static int st_ehci_platform_probe(struct platform_device *dev)
{
	struct usb_hcd *hcd;
	struct resource *res_mem;
	struct usb_ehci_pdata *pdata = &ehci_platform_defaults;
	struct st_ehci_platform_priv *priv;
	struct ehci_hcd *ehci;
	int err, irq, clk = 0;

	if (usb_disabled())
		return -ENODEV;

	irq = platform_get_irq(dev, 0);
	if (irq < 0) {
		dev_err(&dev->dev, "no irq provided");
		return irq;
	}
	res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!res_mem) {
		dev_err(&dev->dev, "no memory resource provided");
		return -ENXIO;
	}

	hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
			     dev_name(&dev->dev));
	if (!hcd)
		return -ENOMEM;

	platform_set_drvdata(dev, hcd);
	dev->dev.platform_data = pdata;
	priv = hcd_to_ehci_priv(hcd);
	ehci = hcd_to_ehci(hcd);

	priv->phy = devm_phy_get(&dev->dev, "usb");
	if (IS_ERR(priv->phy)) {
		err = PTR_ERR(priv->phy);
		goto err_put_hcd;
	}

	for (clk = 0; clk < USB_MAX_CLKS; clk++) {
		priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
		if (IS_ERR(priv->clks[clk])) {
			err = PTR_ERR(priv->clks[clk]);
			if (err == -EPROBE_DEFER)
				goto err_put_clks;
			priv->clks[clk] = NULL;
			break;
		}
	}

	/* some SoCs don't have a dedicated 48Mhz clock, but those that
	   do need the rate to be explicitly set */
	priv->clk48 = devm_clk_get(&dev->dev, "clk48");
	if (IS_ERR(priv->clk48)) {
		dev_info(&dev->dev, "48MHz clk not found\n");
		priv->clk48 = NULL;
	}

	priv->pwr = devm_reset_control_get_optional(&dev->dev, "power");
	if (IS_ERR(priv->pwr)) {
		err = PTR_ERR(priv->pwr);
		if (err == -EPROBE_DEFER)
			goto err_put_clks;
		priv->pwr = NULL;
	}

	priv->rst = devm_reset_control_get_optional(&dev->dev, "softreset");
	if (IS_ERR(priv->rst)) {
		err = PTR_ERR(priv->rst);
		if (err == -EPROBE_DEFER)
			goto err_put_clks;
		priv->rst = NULL;
	}

	if (pdata->power_on) {
		err = pdata->power_on(dev);
		if (err < 0)
			goto err_put_clks;
	}

	hcd->rsrc_start = res_mem->start;
	hcd->rsrc_len = resource_size(res_mem);

	hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
	if (IS_ERR(hcd->regs)) {
		err = PTR_ERR(hcd->regs);
		goto err_put_clks;
	}

	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (err)
		goto err_put_clks;

	device_wakeup_enable(hcd->self.controller);
	platform_set_drvdata(dev, hcd);

	return err;

err_put_clks:
	while (--clk >= 0)
		clk_put(priv->clks[clk]);
err_put_hcd:
	if (pdata == &ehci_platform_defaults)
		dev->dev.platform_data = NULL;

	usb_put_hcd(hcd);

	return err;
}

static int st_ehci_platform_remove(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
	struct st_ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
	int clk;

	usb_remove_hcd(hcd);

	if (pdata->power_off)
		pdata->power_off(dev);

	for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++)
		clk_put(priv->clks[clk]);

	usb_put_hcd(hcd);

	if (pdata == &ehci_platform_defaults)
		dev->dev.platform_data = NULL;

	return 0;
}

#ifdef CONFIG_PM_SLEEP

static int st_ehci_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
	struct platform_device *pdev =
		container_of(dev, struct platform_device, dev);
	bool do_wakeup = device_may_wakeup(dev);
	int ret;

	ret = ehci_suspend(hcd, do_wakeup);
	if (ret)
		return ret;

	if (pdata->power_suspend)
		pdata->power_suspend(pdev);

	pinctrl_pm_select_sleep_state(dev);

	return ret;
}

static int st_ehci_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
	struct platform_device *pdev =
		container_of(dev, struct platform_device, dev);
	int err;

	pinctrl_pm_select_default_state(dev);

	if (pdata->power_on) {
		err = pdata->power_on(pdev);
		if (err < 0)
			return err;
	}

	ehci_resume(hcd, false);
	return 0;
}

static SIMPLE_DEV_PM_OPS(st_ehci_pm_ops, st_ehci_suspend, st_ehci_resume);

#endif /* CONFIG_PM_SLEEP */

static const struct of_device_id st_ehci_ids[] = {
	{ .compatible = "st,st-ehci-300x", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, st_ehci_ids);

static struct platform_driver ehci_platform_driver = {
	.probe		= st_ehci_platform_probe,
	.remove		= st_ehci_platform_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver		= {
		.name	= "st-ehci",
#ifdef CONFIG_PM_SLEEP
		.pm	= &st_ehci_pm_ops,
#endif
		.of_match_table = st_ehci_ids,
	}
};

static int __init ehci_platform_init(void)
{
	if (usb_disabled())
		return -ENODEV;

	pr_info("%s: " DRIVER_DESC "\n", hcd_name);

	ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
	return platform_driver_register(&ehci_platform_driver);
}
module_init(ehci_platform_init);

static void __exit ehci_platform_cleanup(void)
{
	platform_driver_unregister(&ehci_platform_driver);
}
module_exit(ehci_platform_cleanup);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud