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         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
 134 put_hcd:
 135         usb_put_hcd(hcd);
 136
 137         return ret;
 138 }
 139
 140 static 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
 158 static 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
 168 static 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
 182 static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
 183         .suspend         = ehci_msm_pm_suspend,
 184         .resume          = ehci_msm_pm_resume,
 185 };
 186
 187 static const struct of_device_id msm_ehci_dt_match[] = {
 188         { .compatible = "qcom,ehci-host", },
 189         {}
 190 };
 191 MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);
 192
 193 static 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
 203 static const struct ehci_driver_overrides msm_overrides __initdata = {
 204         .reset = ehci_msm_reset,
 205 };
 206
 207 static 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 }
 216 module_init(ehci_msm_init);
 217
 218 static void __exit ehci_msm_cleanup(void)
 219 {
 220         platform_driver_unregister(&ehci_msm_driver);
 221 }
 222 module_exit(ehci_msm_cleanup);
 223
 224 MODULE_DESCRIPTION(DRIVER_DESC);
 225 MODULE_ALIAS("platform:msm-ehci");
 226 MODULE_LICENSE("GPL");