tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* ehci-msm.c - HSUSB Host Controller Driver Implementation
2 *
3 * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
4 *
5 * Partly derived from ehci-fsl.c and ehci-hcd.c
6 * Copyright (c) 2000-2004 by David Brownell
7 * Copyright (c) 2005 MontaVista Software
8 *
9 * All source code in this file is licensed under the following license except
10 * where indicated.
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License version 2 as published
14 * by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 *
20 * See the GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, you can find it at http://www.fsf.org
23 */
24
25#include <linux/clk.h>
26#include <linux/err.h>
27#include <linux/io.h>
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/platform_device.h>
31#include <linux/pm_runtime.h>
32#include <linux/usb/otg.h>
33#include <linux/usb/msm_hsusb_hw.h>
34#include <linux/usb.h>
35#include <linux/usb/hcd.h>
36
37#include "ehci.h"
38
39#define MSM_USB_BASE (hcd->regs)
40
41#define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller"
42
43static const char hcd_name[] = "ehci-msm";
44static struct hc_driver __read_mostly msm_hc_driver;
45
46static int ehci_msm_reset(struct usb_hcd *hcd)
47{
48 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
49 int retval;
50
51 ehci->caps = USB_CAPLENGTH;
52 hcd->has_tt = 1;
53
54 retval = ehci_setup(hcd);
55 if (retval)
56 return retval;
57
58 /* bursts of unspecified length. */
59 writel(0, USB_AHBBURST);
60 /* Use the AHB transactor */
61 writel(0, USB_AHBMODE);
62 /* Disable streaming mode and select host mode */
63 writel(0x13, USB_USBMODE);
64
65 return 0;
66}
67
68static int ehci_msm_probe(struct platform_device *pdev)
69{
70 struct usb_hcd *hcd;
71 struct resource *res;
72 struct usb_phy *phy;
73 int ret;
74
75 dev_dbg(&pdev->dev, "ehci_msm proble\n");
76
77 hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
78 if (!hcd) {
79 dev_err(&pdev->dev, "Unable to create HCD\n");
80 return -ENOMEM;
81 }
82
83 hcd->irq = platform_get_irq(pdev, 0);
84 if (hcd->irq < 0) {
85 dev_err(&pdev->dev, "Unable to get IRQ resource\n");
86 ret = hcd->irq;
87 goto put_hcd;
88 }
89
90 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
91 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
92 if (IS_ERR(hcd->regs)) {
93 ret = PTR_ERR(hcd->regs);
94 goto put_hcd;
95 }
96 hcd->rsrc_start = res->start;
97 hcd->rsrc_len = resource_size(res);
98
99 /*
100 * OTG driver takes care of PHY initialization, clock management,
101 * powering up VBUS, mapping of registers address space and power
102 * management.
103 */
104 if (pdev->dev.of_node)
105 phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
106 else
107 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
108
109 if (IS_ERR(phy)) {
110 dev_err(&pdev->dev, "unable to find transceiver\n");
111 ret = -EPROBE_DEFER;
112 goto put_hcd;
113 }
114
115 ret = otg_set_host(phy->otg, &hcd->self);
116 if (ret < 0) {
117 dev_err(&pdev->dev, "unable to register with transceiver\n");
118 goto put_hcd;
119 }
120
121 hcd->usb_phy = phy;
122 device_init_wakeup(&pdev->dev, 1);
123 /*
124 * OTG device parent of HCD takes care of putting
125 * hardware into low power mode.
126 */
127 pm_runtime_no_callbacks(&pdev->dev);
128 pm_runtime_enable(&pdev->dev);
129
130 /* FIXME: need to call usb_add_hcd() here? */
131
132 return 0;
133
134put_hcd:
135 usb_put_hcd(hcd);
136
137 return ret;
138}
139
140static int ehci_msm_remove(struct platform_device *pdev)
141{
142 struct usb_hcd *hcd = platform_get_drvdata(pdev);
143
144 device_init_wakeup(&pdev->dev, 0);
145 pm_runtime_disable(&pdev->dev);
146 pm_runtime_set_suspended(&pdev->dev);
147
148 otg_set_host(hcd->usb_phy->otg, NULL);
149
150 /* FIXME: need to call usb_remove_hcd() here? */
151
152 usb_put_hcd(hcd);
153
154 return 0;
155}
156
157#ifdef CONFIG_PM
158static int ehci_msm_pm_suspend(struct device *dev)
159{
160 struct usb_hcd *hcd = dev_get_drvdata(dev);
161 bool do_wakeup = device_may_wakeup(dev);
162
163 dev_dbg(dev, "ehci-msm PM suspend\n");
164
165 return ehci_suspend(hcd, do_wakeup);
166}
167
168static int ehci_msm_pm_resume(struct device *dev)
169{
170 struct usb_hcd *hcd = dev_get_drvdata(dev);
171
172 dev_dbg(dev, "ehci-msm PM resume\n");
173 ehci_resume(hcd, false);
174
175 return 0;
176}
177#else
178#define ehci_msm_pm_suspend NULL
179#define ehci_msm_pm_resume NULL
180#endif
181
182static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
183 .suspend = ehci_msm_pm_suspend,
184 .resume = ehci_msm_pm_resume,
185};
186
187static const struct of_device_id msm_ehci_dt_match[] = {
188 { .compatible = "qcom,ehci-host", },
189 {}
190};
191MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);
192
193static struct platform_driver ehci_msm_driver = {
194 .probe = ehci_msm_probe,
195 .remove = ehci_msm_remove,
196 .driver = {
197 .name = "msm_hsusb_host",
198 .pm = &ehci_msm_dev_pm_ops,
199 .of_match_table = msm_ehci_dt_match,
200 },
201};
202
203static const struct ehci_driver_overrides msm_overrides __initdata = {
204 .reset = ehci_msm_reset,
205};
206
207static int __init ehci_msm_init(void)
208{
209 if (usb_disabled())
210 return -ENODEV;
211
212 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
213 ehci_init_driver(&msm_hc_driver, &msm_overrides);
214 return platform_driver_register(&ehci_msm_driver);
215}
216module_init(ehci_msm_init);
217
218static void __exit ehci_msm_cleanup(void)
219{
220 platform_driver_unregister(&ehci_msm_driver);
221}
222module_exit(ehci_msm_cleanup);
223
224MODULE_DESCRIPTION(DRIVER_DESC);
225MODULE_ALIAS("platform:msm-ehci");
226MODULE_LICENSE("GPL");