summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ehci-msm.c
blob: 0f717dc688b7276fb75f65a9920bb799facfb164 (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
/* ehci-msm.c - HSUSB Host Controller Driver Implementation
 *
 * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
 *
 * Partly derived from ehci-fsl.c and ehci-hcd.c
 * Copyright (c) 2000-2004 by David Brownell
 * Copyright (c) 2005 MontaVista Software
 *
 * All source code in this file is licensed under the following license except
 * where indicated.
 *
 * 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.
 *
 * 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, you can find it at http://www.fsf.org
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/usb/otg.h>
#include <linux/usb/msm_hsusb_hw.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>

#include "ehci.h"

#define MSM_USB_BASE (hcd->regs)

#define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller"

static const char hcd_name[] = "ehci-msm";
static struct hc_driver __read_mostly msm_hc_driver;
static struct usb_phy *phy;

static int ehci_msm_reset(struct usb_hcd *hcd)
{
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
	int retval;

	ehci->caps = USB_CAPLENGTH;
	hcd->has_tt = 1;

	retval = ehci_setup(hcd);
	if (retval)
		return retval;

	/* bursts of unspecified length. */
	writel(0, USB_AHBBURST);
	/* Use the AHB transactor */
	writel(0, USB_AHBMODE);
	/* Disable streaming mode and select host mode */
	writel(0x13, USB_USBMODE);

	return 0;
}

static int ehci_msm_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct resource *res;
	int ret;

	dev_dbg(&pdev->dev, "ehci_msm proble\n");

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

	hcd->irq = platform_get_irq(pdev, 0);
	if (hcd->irq < 0) {
		dev_err(&pdev->dev, "Unable to get IRQ resource\n");
		ret = hcd->irq;
		goto put_hcd;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Unable to get memory resource\n");
		ret = -ENODEV;
		goto put_hcd;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto put_hcd;
	}

	/*
	 * OTG driver takes care of PHY initialization, clock management,
	 * powering up VBUS, mapping of registers address space and power
	 * management.
	 */
	phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
	if (IS_ERR(phy)) {
		dev_err(&pdev->dev, "unable to find transceiver\n");
		ret = -ENODEV;
		goto put_hcd;
	}

	ret = otg_set_host(phy->otg, &hcd->self);
	if (ret < 0) {
		dev_err(&pdev->dev, "unable to register with transceiver\n");
		goto put_hcd;
	}

	device_init_wakeup(&pdev->dev, 1);
	/*
	 * OTG device parent of HCD takes care of putting
	 * hardware into low power mode.
	 */
	pm_runtime_no_callbacks(&pdev->dev);
	pm_runtime_enable(&pdev->dev);

	/* FIXME: need to call usb_add_hcd() here? */

	return 0;

put_hcd:
	usb_put_hcd(hcd);

	return ret;
}

static int ehci_msm_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	device_init_wakeup(&pdev->dev, 0);
	pm_runtime_disable(&pdev->dev);
	pm_runtime_set_suspended(&pdev->dev);

	otg_set_host(phy->otg, NULL);

	/* FIXME: need to call usb_remove_hcd() here? */

	usb_put_hcd(hcd);

	return 0;
}

#ifdef CONFIG_PM
static int ehci_msm_pm_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	bool do_wakeup = device_may_wakeup(dev);

	dev_dbg(dev, "ehci-msm PM suspend\n");

	return ehci_suspend(hcd, do_wakeup);
}

static int ehci_msm_pm_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);

	dev_dbg(dev, "ehci-msm PM resume\n");
	ehci_resume(hcd, false);

	return 0;
}
#else
#define ehci_msm_pm_suspend	NULL
#define ehci_msm_pm_resume	NULL
#endif

static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
	.suspend         = ehci_msm_pm_suspend,
	.resume          = ehci_msm_pm_resume,
};

static struct platform_driver ehci_msm_driver = {
	.probe	= ehci_msm_probe,
	.remove	= ehci_msm_remove,
	.driver = {
		   .name = "msm_hsusb_host",
		   .pm = &ehci_msm_dev_pm_ops,
	},
};

static const struct ehci_driver_overrides msm_overrides __initdata = {
	.reset = ehci_msm_reset,
};

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

	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
	ehci_init_driver(&msm_hc_driver, &msm_overrides);
	return platform_driver_register(&ehci_msm_driver);
}
module_init(ehci_msm_init);

static void __exit ehci_msm_cleanup(void)
{
	platform_driver_unregister(&ehci_msm_driver);
}
module_exit(ehci_msm_cleanup);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:msm-ehci");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud