summaryrefslogtreecommitdiff
path: root/drivers/usb/host/ehci-mv.c
blob: 66ec1fdf9fe7d9860c3c0d277391b430c516e339 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
 * Author: Chao Xie <chao.xie@marvell.com>
 *        Neil Zhang <zhangwm@marvell.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/usb/otg.h>
#include <linux/platform_data/mv_usb.h>
#include <linux/io.h>

#include <linux/usb/hcd.h>

#include "ehci.h"

/* registers */
#define U2x_CAPREGS_OFFSET       0x100

#define CAPLENGTH_MASK         (0xff)

#define hcd_to_ehci_hcd_mv(h) ((struct ehci_hcd_mv *)hcd_to_ehci(h)->priv)

struct ehci_hcd_mv {
	/* Which mode does this ehci running OTG/Host ? */
	int mode;

	void __iomem *base;
	void __iomem *cap_regs;
	void __iomem *op_regs;

	struct usb_phy *otg;
	struct clk *clk;

	struct phy *phy;

	int (*set_vbus)(unsigned int vbus);
};

static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
{
	clk_prepare_enable(ehci_mv->clk);
}

static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
{
	clk_disable_unprepare(ehci_mv->clk);
}

static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
{
	ehci_clock_enable(ehci_mv);
	return phy_init(ehci_mv->phy);
}

static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
{
	phy_exit(ehci_mv->phy);
	ehci_clock_disable(ehci_mv);
}

static int mv_ehci_reset(struct usb_hcd *hcd)
{
	struct device *dev = hcd->self.controller;
	struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
	int retval;

	if (ehci_mv == NULL) {
		dev_err(dev, "Can not find private ehci data\n");
		return -ENODEV;
	}

	hcd->has_tt = 1;

	retval = ehci_setup(hcd);
	if (retval)
		dev_err(dev, "ehci_setup failed %d\n", retval);

	return retval;
}

static struct hc_driver __read_mostly ehci_platform_hc_driver;

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

static int mv_ehci_probe(struct platform_device *pdev)
{
	struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
	struct usb_hcd *hcd;
	struct ehci_hcd *ehci;
	struct ehci_hcd_mv *ehci_mv;
	struct resource *r;
	int retval = -ENODEV;
	u32 offset;

	if (usb_disabled())
		return -ENODEV;

	hcd = usb_create_hcd(&ehci_platform_hc_driver, &pdev->dev, "mv ehci");
	if (!hcd)
		return -ENOMEM;

	platform_set_drvdata(pdev, hcd);
	ehci_mv = hcd_to_ehci_hcd_mv(hcd);

	ehci_mv->mode = MV_USB_MODE_HOST;
	if (pdata) {
		ehci_mv->mode = pdata->mode;
		ehci_mv->set_vbus = pdata->set_vbus;
	}

	ehci_mv->phy = devm_phy_get(&pdev->dev, "usb");
	if (IS_ERR(ehci_mv->phy)) {
		retval = PTR_ERR(ehci_mv->phy);
		if (retval != -EPROBE_DEFER)
			dev_err(&pdev->dev, "Failed to get phy.\n");
		goto err_put_hcd;
	}

	ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(ehci_mv->clk)) {
		dev_err(&pdev->dev, "error getting clock\n");
		retval = PTR_ERR(ehci_mv->clk);
		goto err_put_hcd;
	}



	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	ehci_mv->base = devm_ioremap_resource(&pdev->dev, r);
	if (IS_ERR(ehci_mv->base)) {
		retval = PTR_ERR(ehci_mv->base);
		goto err_put_hcd;
	}

	retval = mv_ehci_enable(ehci_mv);
	if (retval) {
		dev_err(&pdev->dev, "init phy error %d\n", retval);
		goto err_put_hcd;
	}

	ehci_mv->cap_regs =
		(void __iomem *) ((unsigned long) ehci_mv->base + U2x_CAPREGS_OFFSET);
	offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
	ehci_mv->op_regs =
		(void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);

	hcd->rsrc_start = r->start;
	hcd->rsrc_len = resource_size(r);
	hcd->regs = ehci_mv->op_regs;

	hcd->irq = platform_get_irq(pdev, 0);
	if (!hcd->irq) {
		dev_err(&pdev->dev, "Cannot get irq.");
		retval = -ENODEV;
		goto err_disable_clk;
	}

	ehci = hcd_to_ehci(hcd);
	ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;

	if (ehci_mv->mode == MV_USB_MODE_OTG) {
		ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
		if (IS_ERR(ehci_mv->otg)) {
			retval = PTR_ERR(ehci_mv->otg);

			if (retval == -ENXIO)
				dev_info(&pdev->dev, "MV_USB_MODE_OTG "
						"must have CONFIG_USB_PHY enabled\n");
			else
				dev_err(&pdev->dev,
						"unable to find transceiver\n");
			goto err_disable_clk;
		}

		retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
		if (retval < 0) {
			dev_err(&pdev->dev,
				"unable to register with transceiver\n");
			retval = -ENODEV;
			goto err_disable_clk;
		}
		/* otg will enable clock before use as host */
		mv_ehci_disable(ehci_mv);
	} else {
		if (ehci_mv->set_vbus)
			ehci_mv->set_vbus(1);

		retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
		if (retval) {
			dev_err(&pdev->dev,
				"failed to add hcd with err %d\n", retval);
			goto err_set_vbus;
		}
		device_wakeup_enable(hcd->self.controller);
	}

	dev_info(&pdev->dev,
		 "successful find EHCI device with regs 0x%p irq %d"
		 " working in %s mode\n", hcd->regs, hcd->irq,
		 ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");

	return 0;

err_set_vbus:
	if (ehci_mv->set_vbus)
		ehci_mv->set_vbus(0);
err_disable_clk:
	mv_ehci_disable(ehci_mv);
err_put_hcd:
	usb_put_hcd(hcd);

	return retval;
}

static int mv_ehci_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);

	if (hcd->rh_registered)
		usb_remove_hcd(hcd);

	if (!IS_ERR_OR_NULL(ehci_mv->otg))
		otg_set_host(ehci_mv->otg->otg, NULL);

	if (ehci_mv->mode == MV_USB_MODE_HOST) {
		if (ehci_mv->set_vbus)
			ehci_mv->set_vbus(0);

		mv_ehci_disable(ehci_mv);
	}

	usb_put_hcd(hcd);

	return 0;
}

MODULE_ALIAS("mv-ehci");

static const struct platform_device_id ehci_id_table[] = {
	{"pxa-u2oehci", PXA_U2OEHCI},
	{"pxa-sph", PXA_SPH},
	{"mmp3-hsic", MMP3_HSIC},
	{"mmp3-fsic", MMP3_FSIC},
	{},
};

static void mv_ehci_shutdown(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	if (!hcd->rh_registered)
		return;

	if (hcd->driver->shutdown)
		hcd->driver->shutdown(hcd);
}

static const struct of_device_id ehci_mv_dt_ids[] = {
	{ .compatible = "marvell,pxau2o-ehci", },
	{},
};

static struct platform_driver ehci_mv_driver = {
	.probe = mv_ehci_probe,
	.remove = mv_ehci_remove,
	.shutdown = mv_ehci_shutdown,
	.driver = {
		.name = "mv-ehci",
		.bus = &platform_bus_type,
		.of_match_table = ehci_mv_dt_ids,
	},
	.id_table = ehci_id_table,
};

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

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

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

MODULE_DESCRIPTION("Marvell EHCI driver");
MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>");
MODULE_AUTHOR("Neil Zhang <zhangwm@marvell.com>");
MODULE_ALIAS("mv-ehci");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(of, ehci_mv_dt_ids);