summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ehci-msm.c
blob: 2f8d3af811ce0689b15eb1f19b98edd092d61198 (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
/* 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 <linux/acpi.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 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;

	/* select ULPI phy and clear other status/control bits in PORTSC */
	writel(PORTSC_PTS_ULPI, USB_PORTSC);
	/* bursts of unspecified length. */
	writel(0, USB_AHBBURST);
	/* Use the AHB transactor, allow posted data writes */
	writel(0x8, USB_AHBMODE);
	/* Disable streaming mode and select host mode */
	writel(0x13, USB_USBMODE);
	/* Disable ULPI_TX_PKT_EN_CLR_FIX which is valid only for HSIC */
	writel(readl(USB_GENCONFIG_2) & ~ULPI_TX_PKT_EN_CLR_FIX, USB_GENCONFIG_2);

	return 0;
}

static int ehci_msm_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct resource *res;
	struct usb_phy *phy;
	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;
	}

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

	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;
	}

	/*
	 * If there is an OTG driver, let it take care of PHY initialization,
	 * clock management, powering up VBUS, mapping of registers address
	 * space and power management.
	 */
	if (pdev->dev.of_node)
		phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
	else
		phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);

	if (IS_ERR(phy)) {
		if (PTR_ERR(phy) == -EPROBE_DEFER) {
			dev_err(&pdev->dev, "unable to find transceiver\n");
			ret = -EPROBE_DEFER;
			goto put_hcd;
		}
		phy = NULL;
	}

	hcd->usb_phy = phy;
	device_init_wakeup(&pdev->dev, 1);

	if (phy && phy->otg) {
		/*
		 * MSM OTG driver takes care of adding the HCD and
		 * placing hardware into low power mode via runtime PM.
		 */
		ret = otg_set_host(phy->otg, &hcd->self);
		if (ret < 0) {
			dev_err(&pdev->dev, "unable to register with transceiver\n");
			goto put_hcd;
		}

		pm_runtime_no_callbacks(&pdev->dev);
		pm_runtime_enable(&pdev->dev);
	} else {
		ret = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
		if (ret)
			goto put_hcd;
	}

	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);

	if (hcd->usb_phy && hcd->usb_phy->otg)
		otg_set_host(hcd->usb_phy->otg, NULL);
	else
		usb_remove_hcd(hcd);

	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);
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
	bool do_wakeup = device_may_wakeup(dev);

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

	/* Only call ehci_suspend if ehci_setup has been done */
	if (ehci->sbrn)
		return ehci_suspend(hcd, do_wakeup);

	return 0;
}

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

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

	/* Only call ehci_resume if ehci_setup has been done */
	if (ehci->sbrn)
		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 const struct acpi_device_id msm_ehci_acpi_ids[] = {
	{ "QCOM8040", 0 },
	{ }
};
MODULE_DEVICE_TABLE(acpi, msm_ehci_acpi_ids);

static const struct of_device_id msm_ehci_dt_match[] = {
	{ .compatible = "qcom,ehci-host", },
	{}
};
MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);

static struct platform_driver ehci_msm_driver = {
	.probe	= ehci_msm_probe,
	.remove	= ehci_msm_remove,
	.shutdown = usb_hcd_platform_shutdown,
	.driver = {
		   .name = "msm_hsusb_host",
		   .pm = &ehci_msm_dev_pm_ops,
		   .of_match_table = msm_ehci_dt_match,
		   .acpi_match_table = ACPI_PTR(msm_ehci_acpi_ids),
	},
};

static const struct ehci_driver_overrides msm_overrides __initconst = {
	.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");