Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / drivers / usb / host / ehci-msm.c
blobf341651d6f6ce6e4ae67a2d53ab2cab3aefeb81e
1 /* ehci-msm.c - HSUSB Host Controller Driver Implementation
3 * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
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
9 * All source code in this file is licensed under the following license except
10 * where indicated.
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.
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.
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
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>
37 #include "ehci.h"
39 #define MSM_USB_BASE (hcd->regs)
41 #define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller"
43 static const char hcd_name[] = "ehci-msm";
44 static struct hc_driver __read_mostly msm_hc_driver;
46 static int ehci_msm_reset(struct usb_hcd *hcd)
48 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
49 int retval;
51 ehci->caps = USB_CAPLENGTH;
52 hcd->has_tt = 1;
54 retval = ehci_setup(hcd);
55 if (retval)
56 return retval;
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);
65 return 0;
68 static int ehci_msm_probe(struct platform_device *pdev)
70 struct usb_hcd *hcd;
71 struct resource *res;
72 struct usb_phy *phy;
73 int ret;
75 dev_dbg(&pdev->dev, "ehci_msm proble\n");
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;
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;
90 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
91 if (!res) {
92 dev_err(&pdev->dev, "Unable to get memory resource\n");
93 ret = -ENODEV;
94 goto put_hcd;
97 hcd->rsrc_start = res->start;
98 hcd->rsrc_len = resource_size(res);
99 hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
100 if (!hcd->regs) {
101 dev_err(&pdev->dev, "ioremap failed\n");
102 ret = -ENOMEM;
103 goto put_hcd;
107 * OTG driver takes care of PHY initialization, clock management,
108 * powering up VBUS, mapping of registers address space and power
109 * management.
111 if (pdev->dev.of_node)
112 phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
113 else
114 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
116 if (IS_ERR(phy)) {
117 dev_err(&pdev->dev, "unable to find transceiver\n");
118 ret = -EPROBE_DEFER;
119 goto put_hcd;
122 ret = otg_set_host(phy->otg, &hcd->self);
123 if (ret < 0) {
124 dev_err(&pdev->dev, "unable to register with transceiver\n");
125 goto put_hcd;
128 hcd->phy = phy;
129 device_init_wakeup(&pdev->dev, 1);
131 * OTG device parent of HCD takes care of putting
132 * hardware into low power mode.
134 pm_runtime_no_callbacks(&pdev->dev);
135 pm_runtime_enable(&pdev->dev);
137 /* FIXME: need to call usb_add_hcd() here? */
139 return 0;
141 put_hcd:
142 usb_put_hcd(hcd);
144 return ret;
147 static int ehci_msm_remove(struct platform_device *pdev)
149 struct usb_hcd *hcd = platform_get_drvdata(pdev);
151 device_init_wakeup(&pdev->dev, 0);
152 pm_runtime_disable(&pdev->dev);
153 pm_runtime_set_suspended(&pdev->dev);
155 otg_set_host(hcd->phy->otg, NULL);
157 /* FIXME: need to call usb_remove_hcd() here? */
159 usb_put_hcd(hcd);
161 return 0;
164 #ifdef CONFIG_PM
165 static int ehci_msm_pm_suspend(struct device *dev)
167 struct usb_hcd *hcd = dev_get_drvdata(dev);
168 bool do_wakeup = device_may_wakeup(dev);
170 dev_dbg(dev, "ehci-msm PM suspend\n");
172 return ehci_suspend(hcd, do_wakeup);
175 static int ehci_msm_pm_resume(struct device *dev)
177 struct usb_hcd *hcd = dev_get_drvdata(dev);
179 dev_dbg(dev, "ehci-msm PM resume\n");
180 ehci_resume(hcd, false);
182 return 0;
184 #else
185 #define ehci_msm_pm_suspend NULL
186 #define ehci_msm_pm_resume NULL
187 #endif
189 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
190 .suspend = ehci_msm_pm_suspend,
191 .resume = ehci_msm_pm_resume,
194 static struct of_device_id msm_ehci_dt_match[] = {
195 { .compatible = "qcom,ehci-host", },
198 MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);
200 static struct platform_driver ehci_msm_driver = {
201 .probe = ehci_msm_probe,
202 .remove = ehci_msm_remove,
203 .driver = {
204 .name = "msm_hsusb_host",
205 .pm = &ehci_msm_dev_pm_ops,
206 .of_match_table = msm_ehci_dt_match,
210 static const struct ehci_driver_overrides msm_overrides __initdata = {
211 .reset = ehci_msm_reset,
214 static int __init ehci_msm_init(void)
216 if (usb_disabled())
217 return -ENODEV;
219 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
220 ehci_init_driver(&msm_hc_driver, &msm_overrides);
221 return platform_driver_register(&ehci_msm_driver);
223 module_init(ehci_msm_init);
225 static void __exit ehci_msm_cleanup(void)
227 platform_driver_unregister(&ehci_msm_driver);
229 module_exit(ehci_msm_cleanup);
231 MODULE_DESCRIPTION(DRIVER_DESC);
232 MODULE_ALIAS("platform:msm-ehci");
233 MODULE_LICENSE("GPL");