summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ehci-exynos.c
blob: f58c9750e3e4931dd42f34eafb70dfc532116095 (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
/*
 * SAMSUNG EXYNOS USB HOST EHCI Controller
 *
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Author: Jingoo Han <jg1.han@samsung.com>
 * Author: Joonyoung Shim <jy0922.shim@samsung.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.
 *
 */

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

#include "ehci.h"

#define DRIVER_DESC "EHCI EXYNOS driver"

#define EHCI_INSNREG00(base)			(base + 0x90)
#define EHCI_INSNREG00_ENA_INCR16		(0x1 << 25)
#define EHCI_INSNREG00_ENA_INCR8		(0x1 << 24)
#define EHCI_INSNREG00_ENA_INCR4		(0x1 << 23)
#define EHCI_INSNREG00_ENA_INCRX_ALIGN		(0x1 << 22)
#define EHCI_INSNREG00_ENABLE_DMA_BURST	\
	(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 |	\
	 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)

static const char hcd_name[] = "ehci-exynos";
static struct hc_driver __read_mostly exynos_ehci_hc_driver;

#define PHY_NUMBER 3

struct exynos_ehci_hcd {
	struct clk *clk;
	struct phy *phy[PHY_NUMBER];
};

#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)

static int exynos_ehci_get_phy(struct device *dev,
				struct exynos_ehci_hcd *exynos_ehci)
{
	struct device_node *child;
	struct phy *phy;
	int phy_number;
	int ret;

	/* Get PHYs for the controller */
	for_each_available_child_of_node(dev->of_node, child) {
		ret = of_property_read_u32(child, "reg", &phy_number);
		if (ret) {
			dev_err(dev, "Failed to parse device tree\n");
			of_node_put(child);
			return ret;
		}

		if (phy_number >= PHY_NUMBER) {
			dev_err(dev, "Invalid number of PHYs\n");
			of_node_put(child);
			return -EINVAL;
		}

		phy = devm_of_phy_get(dev, child, NULL);
		exynos_ehci->phy[phy_number] = phy;
		if (IS_ERR(phy)) {
			ret = PTR_ERR(phy);
			if (ret == -EPROBE_DEFER) {
				return ret;
			} else if (ret != -ENOSYS && ret != -ENODEV) {
				dev_err(dev,
					"Error retrieving usb2 phy: %d\n", ret);
				return ret;
			}
		}
	}

	return 0;
}

static int exynos_ehci_phy_enable(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	int i;
	int ret = 0;

	for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
		if (!IS_ERR(exynos_ehci->phy[i]))
			ret = phy_power_on(exynos_ehci->phy[i]);
	if (ret)
		for (i--; i >= 0; i--)
			if (!IS_ERR(exynos_ehci->phy[i]))
				phy_power_off(exynos_ehci->phy[i]);

	return ret;
}

static void exynos_ehci_phy_disable(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	int i;

	for (i = 0; i < PHY_NUMBER; i++)
		if (!IS_ERR(exynos_ehci->phy[i]))
			phy_power_off(exynos_ehci->phy[i]);
}

static void exynos_setup_vbus_gpio(struct device *dev)
{
	int err;
	int gpio;

	if (!dev->of_node)
		return;

	gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
	if (!gpio_is_valid(gpio))
		return;

	err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
				    "ehci_vbus_gpio");
	if (err)
		dev_err(dev, "can't request ehci vbus gpio %d", gpio);
}

static int exynos_ehci_probe(struct platform_device *pdev)
{
	struct exynos_ehci_hcd *exynos_ehci;
	struct usb_hcd *hcd;
	struct ehci_hcd *ehci;
	struct resource *res;
	int irq;
	int err;

	/*
	 * Right now device-tree probed devices don't get dma_mask set.
	 * Since shared usb code relies on it, set it here for now.
	 * Once we move to full device tree support this will vanish off.
	 */
	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
	if (err)
		return err;

	exynos_setup_vbus_gpio(&pdev->dev);

	hcd = usb_create_hcd(&exynos_ehci_hc_driver,
			     &pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		dev_err(&pdev->dev, "Unable to create HCD\n");
		return -ENOMEM;
	}
	exynos_ehci = to_exynos_ehci(hcd);

	if (of_device_is_compatible(pdev->dev.of_node,
					"samsung,exynos5440-ehci"))
		goto skip_phy;

	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
	if (err)
		goto fail_clk;

skip_phy:

	exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");

	if (IS_ERR(exynos_ehci->clk)) {
		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
		err = PTR_ERR(exynos_ehci->clk);
		goto fail_clk;
	}

	err = clk_prepare_enable(exynos_ehci->clk);
	if (err)
		goto fail_clk;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(hcd->regs)) {
		err = PTR_ERR(hcd->regs);
		goto fail_io;
	}

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

	irq = platform_get_irq(pdev, 0);
	if (!irq) {
		dev_err(&pdev->dev, "Failed to get IRQ\n");
		err = -ENODEV;
		goto fail_io;
	}

	err = exynos_ehci_phy_enable(&pdev->dev);
	if (err) {
		dev_err(&pdev->dev, "Failed to enable USB phy\n");
		goto fail_io;
	}

	ehci = hcd_to_ehci(hcd);
	ehci->caps = hcd->regs;

	/* DMA burst Enable */
	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));

	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (err) {
		dev_err(&pdev->dev, "Failed to add USB HCD\n");
		goto fail_add_hcd;
	}
	device_wakeup_enable(hcd->self.controller);

	platform_set_drvdata(pdev, hcd);

	return 0;

fail_add_hcd:
	exynos_ehci_phy_disable(&pdev->dev);
fail_io:
	clk_disable_unprepare(exynos_ehci->clk);
fail_clk:
	usb_put_hcd(hcd);
	return err;
}

static int exynos_ehci_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);

	usb_remove_hcd(hcd);

	exynos_ehci_phy_disable(&pdev->dev);

	clk_disable_unprepare(exynos_ehci->clk);

	usb_put_hcd(hcd);

	return 0;
}

#ifdef CONFIG_PM
static int exynos_ehci_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);

	bool do_wakeup = device_may_wakeup(dev);
	int rc;

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

	exynos_ehci_phy_disable(dev);

	clk_disable_unprepare(exynos_ehci->clk);

	return rc;
}

static int exynos_ehci_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	int ret;

	clk_prepare_enable(exynos_ehci->clk);

	ret = exynos_ehci_phy_enable(dev);
	if (ret) {
		dev_err(dev, "Failed to enable USB phy\n");
		clk_disable_unprepare(exynos_ehci->clk);
		return ret;
	}

	/* DMA burst Enable */
	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));

	ehci_resume(hcd, false);
	return 0;
}
#else
#define exynos_ehci_suspend	NULL
#define exynos_ehci_resume	NULL
#endif

static const struct dev_pm_ops exynos_ehci_pm_ops = {
	.suspend	= exynos_ehci_suspend,
	.resume		= exynos_ehci_resume,
};

#ifdef CONFIG_OF
static const struct of_device_id exynos_ehci_match[] = {
	{ .compatible = "samsung,exynos4210-ehci" },
	{ .compatible = "samsung,exynos5440-ehci" },
	{},
};
MODULE_DEVICE_TABLE(of, exynos_ehci_match);
#endif

static struct platform_driver exynos_ehci_driver = {
	.probe		= exynos_ehci_probe,
	.remove		= exynos_ehci_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver = {
		.name	= "exynos-ehci",
		.owner	= THIS_MODULE,
		.pm	= &exynos_ehci_pm_ops,
		.of_match_table = of_match_ptr(exynos_ehci_match),
	}
};
static const struct ehci_driver_overrides exynos_overrides __initdata = {
	.extra_priv_size = sizeof(struct exynos_ehci_hcd),
};

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

	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
	ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
	return platform_driver_register(&exynos_ehci_driver);
}
module_init(ehci_exynos_init);

static void __exit ehci_exynos_cleanup(void)
{
	platform_driver_unregister(&exynos_ehci_driver);
}
module_exit(ehci_exynos_cleanup);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:exynos-ehci");
MODULE_AUTHOR("Jingoo Han");
MODULE_AUTHOR("Joonyoung Shim");
MODULE_LICENSE("GPL v2");