xhci: tegra: support HSIC ports
[linux-3.10.git] / drivers / usb / host / ehci-msm.c
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
43 static const char hcd_name[] = "ehci-msm";
44 static struct hc_driver __read_mostly msm_hc_driver;
45 static struct usb_phy *phy;
46
47 static int ehci_msm_reset(struct usb_hcd *hcd)
48 {
49         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
50         int retval;
51
52         ehci->caps = USB_CAPLENGTH;
53         hcd->has_tt = 1;
54
55         retval = ehci_setup(hcd);
56         if (retval)
57                 return retval;
58
59         /* bursts of unspecified length. */
60         writel(0, USB_AHBBURST);
61         /* Use the AHB transactor */
62         writel(0, USB_AHBMODE);
63         /* Disable streaming mode and select host mode */
64         writel(0x13, USB_USBMODE);
65
66         return 0;
67 }
68
69 static int ehci_msm_probe(struct platform_device *pdev)
70 {
71         struct usb_hcd *hcd;
72         struct resource *res;
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         if (!res) {
92                 dev_err(&pdev->dev, "Unable to get memory resource\n");
93                 ret = -ENODEV;
94                 goto put_hcd;
95         }
96
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;
104         }
105
106         /*
107          * OTG driver takes care of PHY initialization, clock management,
108          * powering up VBUS, mapping of registers address space and power
109          * management.
110          */
111         phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
112         if (IS_ERR(phy)) {
113                 dev_err(&pdev->dev, "unable to find transceiver\n");
114                 ret = -ENODEV;
115                 goto put_hcd;
116         }
117
118         ret = otg_set_host(phy->otg, &hcd->self);
119         if (ret < 0) {
120                 dev_err(&pdev->dev, "unable to register with transceiver\n");
121                 goto put_hcd;
122         }
123
124         device_init_wakeup(&pdev->dev, 1);
125         /*
126          * OTG device parent of HCD takes care of putting
127          * hardware into low power mode.
128          */
129         pm_runtime_no_callbacks(&pdev->dev);
130         pm_runtime_enable(&pdev->dev);
131
132         /* FIXME: need to call usb_add_hcd() here? */
133
134         return 0;
135
136 put_hcd:
137         usb_put_hcd(hcd);
138
139         return ret;
140 }
141
142 static int ehci_msm_remove(struct platform_device *pdev)
143 {
144         struct usb_hcd *hcd = platform_get_drvdata(pdev);
145
146         device_init_wakeup(&pdev->dev, 0);
147         pm_runtime_disable(&pdev->dev);
148         pm_runtime_set_suspended(&pdev->dev);
149
150         otg_set_host(phy->otg, NULL);
151
152         /* FIXME: need to call usb_remove_hcd() here? */
153
154         usb_put_hcd(hcd);
155
156         return 0;
157 }
158
159 #ifdef CONFIG_PM
160 static int ehci_msm_pm_suspend(struct device *dev)
161 {
162         struct usb_hcd *hcd = dev_get_drvdata(dev);
163         bool do_wakeup = device_may_wakeup(dev);
164
165         dev_dbg(dev, "ehci-msm PM suspend\n");
166
167         return ehci_suspend(hcd, do_wakeup);
168 }
169
170 static int ehci_msm_pm_resume(struct device *dev)
171 {
172         struct usb_hcd *hcd = dev_get_drvdata(dev);
173
174         dev_dbg(dev, "ehci-msm PM resume\n");
175         ehci_resume(hcd, false);
176
177         return 0;
178 }
179 #else
180 #define ehci_msm_pm_suspend     NULL
181 #define ehci_msm_pm_resume      NULL
182 #endif
183
184 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
185         .suspend         = ehci_msm_pm_suspend,
186         .resume          = ehci_msm_pm_resume,
187 };
188
189 static struct platform_driver ehci_msm_driver = {
190         .probe  = ehci_msm_probe,
191         .remove = ehci_msm_remove,
192         .driver = {
193                    .name = "msm_hsusb_host",
194                    .pm = &ehci_msm_dev_pm_ops,
195         },
196 };
197
198 static const struct ehci_driver_overrides msm_overrides __initdata = {
199         .reset = ehci_msm_reset,
200 };
201
202 static int __init ehci_msm_init(void)
203 {
204         if (usb_disabled())
205                 return -ENODEV;
206
207         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
208         ehci_init_driver(&msm_hc_driver, &msm_overrides);
209         return platform_driver_register(&ehci_msm_driver);
210 }
211 module_init(ehci_msm_init);
212
213 static void __exit ehci_msm_cleanup(void)
214 {
215         platform_driver_unregister(&ehci_msm_driver);
216 }
217 module_exit(ehci_msm_cleanup);
218
219 MODULE_DESCRIPTION(DRIVER_DESC);
220 MODULE_ALIAS("platform:msm-ehci");
221 MODULE_LICENSE("GPL");