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Linux/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 
 46 static 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 
 68 static 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         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_resource(&pdev->dev, res);
100         if (IS_ERR(hcd->regs)) {
101                 ret = PTR_ERR(hcd->regs);
102                 goto put_hcd;
103         }
104 
105         /*
106          * OTG driver takes care of PHY initialization, clock management,
107          * powering up VBUS, mapping of registers address space and power
108          * management.
109          */
110         if (pdev->dev.of_node)
111                 phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
112         else
113                 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
114 
115         if (IS_ERR(phy)) {
116                 dev_err(&pdev->dev, "unable to find transceiver\n");
117                 ret = -EPROBE_DEFER;
118                 goto put_hcd;
119         }
120 
121         ret = otg_set_host(phy->otg, &hcd->self);
122         if (ret < 0) {
123                 dev_err(&pdev->dev, "unable to register with transceiver\n");
124                 goto put_hcd;
125         }
126 
127         hcd->phy = phy;
128         device_init_wakeup(&pdev->dev, 1);
129         /*
130          * OTG device parent of HCD takes care of putting
131          * hardware into low power mode.
132          */
133         pm_runtime_no_callbacks(&pdev->dev);
134         pm_runtime_enable(&pdev->dev);
135 
136         /* FIXME: need to call usb_add_hcd() here? */
137 
138         return 0;
139 
140 put_hcd:
141         usb_put_hcd(hcd);
142 
143         return ret;
144 }
145 
146 static int ehci_msm_remove(struct platform_device *pdev)
147 {
148         struct usb_hcd *hcd = platform_get_drvdata(pdev);
149 
150         device_init_wakeup(&pdev->dev, 0);
151         pm_runtime_disable(&pdev->dev);
152         pm_runtime_set_suspended(&pdev->dev);
153 
154         otg_set_host(hcd->phy->otg, NULL);
155 
156         /* FIXME: need to call usb_remove_hcd() here? */
157 
158         usb_put_hcd(hcd);
159 
160         return 0;
161 }
162 
163 #ifdef CONFIG_PM
164 static int ehci_msm_pm_suspend(struct device *dev)
165 {
166         struct usb_hcd *hcd = dev_get_drvdata(dev);
167         bool do_wakeup = device_may_wakeup(dev);
168 
169         dev_dbg(dev, "ehci-msm PM suspend\n");
170 
171         return ehci_suspend(hcd, do_wakeup);
172 }
173 
174 static int ehci_msm_pm_resume(struct device *dev)
175 {
176         struct usb_hcd *hcd = dev_get_drvdata(dev);
177 
178         dev_dbg(dev, "ehci-msm PM resume\n");
179         ehci_resume(hcd, false);
180 
181         return 0;
182 }
183 #else
184 #define ehci_msm_pm_suspend     NULL
185 #define ehci_msm_pm_resume      NULL
186 #endif
187 
188 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
189         .suspend         = ehci_msm_pm_suspend,
190         .resume          = ehci_msm_pm_resume,
191 };
192 
193 static const struct of_device_id msm_ehci_dt_match[] = {
194         { .compatible = "qcom,ehci-host", },
195         {}
196 };
197 MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);
198 
199 static struct platform_driver ehci_msm_driver = {
200         .probe  = ehci_msm_probe,
201         .remove = ehci_msm_remove,
202         .driver = {
203                    .name = "msm_hsusb_host",
204                    .pm = &ehci_msm_dev_pm_ops,
205                    .of_match_table = msm_ehci_dt_match,
206         },
207 };
208 
209 static const struct ehci_driver_overrides msm_overrides __initdata = {
210         .reset = ehci_msm_reset,
211 };
212 
213 static int __init ehci_msm_init(void)
214 {
215         if (usb_disabled())
216                 return -ENODEV;
217 
218         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
219         ehci_init_driver(&msm_hc_driver, &msm_overrides);
220         return platform_driver_register(&ehci_msm_driver);
221 }
222 module_init(ehci_msm_init);
223 
224 static void __exit ehci_msm_cleanup(void)
225 {
226         platform_driver_unregister(&ehci_msm_driver);
227 }
228 module_exit(ehci_msm_cleanup);
229 
230 MODULE_DESCRIPTION(DRIVER_DESC);
231 MODULE_ALIAS("platform:msm-ehci");
232 MODULE_LICENSE("GPL");
233 

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