drivers/usb/host/ehci-platform.c

   1 /*
   2  * Generic platform ehci driver
   3  *
   4  * Copyright 2007 Steven Brown <sbrown@cortland.com>
   5  * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
   6  *
   7  * Derived from the ohci-ssb driver
   8  * Copyright 2007 Michael Buesch <m@bues.ch>
   9  *
  10  * Derived from the EHCI-PCI driver
  11  * Copyright (c) 2000-2004 by David Brownell
  12  *
  13  * Derived from the ohci-pci driver
  14  * Copyright 1999 Roman Weissgaerber
  15  * Copyright 2000-2002 David Brownell
  16  * Copyright 1999 Linus Torvalds
  17  * Copyright 1999 Gregory P. Smith
  18  *
  19  * Licensed under the GNU/GPL. See COPYING for details.
  20  */
  21 #include <linux/err.h>
  22 #include <linux/kernel.h>
  23 #include <linux/hrtimer.h>
  24 #include <linux/io.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/usb.h>
  28 #include <linux/usb/hcd.h>
  29 #include <linux/usb/ehci_pdriver.h>
  30
  31 #include "ehci.h"
  32
  33 #define DRIVER_DESC "EHCI generic platform driver"
  34
  35 static const char hcd_name[] = "ehci-platform";
  36
  37 static int ehci_platform_reset(struct usb_hcd *hcd)
  38 {
  39         struct platform_device *pdev = to_platform_device(hcd->self.controller);
  40         struct usb_ehci_pdata *pdata = pdev->dev.platform_data;
  41         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  42         int retval;
  43
  44         hcd->has_tt = pdata->has_tt;
  45         ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
  46         ehci->big_endian_desc = pdata->big_endian_desc;
  47         ehci->big_endian_mmio = pdata->big_endian_mmio;
  48
  49         ehci->caps = hcd->regs + pdata->caps_offset;
  50         retval = ehci_setup(hcd);
  51         if (retval)
  52                 return retval;
  53
  54         if (pdata->no_io_watchdog)
  55                 ehci->need_io_watchdog = 0;
  56         return 0;
  57 }
  58
  59 static struct hc_driver __read_mostly ehci_platform_hc_driver;
  60
  61 static const struct ehci_driver_overrides platform_overrides __initdata = {
  62         .reset =        ehci_platform_reset,
  63 };
  64
  65 static int ehci_platform_probe(struct platform_device *dev)
  66 {
  67         struct usb_hcd *hcd;
  68         struct resource *res_mem;
  69         struct usb_ehci_pdata *pdata = dev->dev.platform_data;
  70         int irq;
  71         int err = -ENOMEM;
  72
  73         if (!pdata) {
  74                 WARN_ON(1);
  75                 return -ENODEV;
  76         }
  77
  78         if (usb_disabled())
  79                 return -ENODEV;
  80
  81         irq = platform_get_irq(dev, 0);
  82         if (irq < 0) {
  83                 dev_err(&dev->dev, "no irq provided");
  84                 return irq;
  85         }
  86         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
  87         if (!res_mem) {
  88                 dev_err(&dev->dev, "no memory resource provided");
  89                 return -ENXIO;
  90         }
  91
  92         if (pdata->power_on) {
  93                 err = pdata->power_on(dev);
  94                 if (err < 0)
  95                         return err;
  96         }
  97
  98         hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
  99                              dev_name(&dev->dev));
 100         if (!hcd) {
 101                 err = -ENOMEM;
 102                 goto err_power;
 103         }
 104
 105         hcd->rsrc_start = res_mem->start;
 106         hcd->rsrc_len = resource_size(res_mem);
 107
 108         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
 109         if (IS_ERR(hcd->regs)) {
 110                 err = PTR_ERR(hcd->regs);
 111                 goto err_put_hcd;
 112         }
 113         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 114         if (err)
 115                 goto err_put_hcd;
 116
 117         platform_set_drvdata(dev, hcd);
 118
 119         return err;
 120
 121 err_put_hcd:
 122         usb_put_hcd(hcd);
 123 err_power:
 124         if (pdata->power_off)
 125                 pdata->power_off(dev);
 126
 127         return err;
 128 }
 129
 130 static int ehci_platform_remove(struct platform_device *dev)
 131 {
 132         struct usb_hcd *hcd = platform_get_drvdata(dev);
 133         struct usb_ehci_pdata *pdata = dev->dev.platform_data;
 134
 135         usb_remove_hcd(hcd);
 136         usb_put_hcd(hcd);
 137         platform_set_drvdata(dev, NULL);
 138
 139         if (pdata->power_off)
 140                 pdata->power_off(dev);
 141
 142         return 0;
 143 }
 144
 145 #ifdef CONFIG_PM
 146
 147 static int ehci_platform_suspend(struct device *dev)
 148 {
 149         struct usb_hcd *hcd = dev_get_drvdata(dev);
 150         struct usb_ehci_pdata *pdata = dev->platform_data;
 151         struct platform_device *pdev =
 152                 container_of(dev, struct platform_device, dev);
 153         bool do_wakeup = device_may_wakeup(dev);
 154         int ret;
 155
 156         ret = ehci_suspend(hcd, do_wakeup);
 157
 158         if (pdata->power_suspend)
 159                 pdata->power_suspend(pdev);
 160
 161         return ret;
 162 }
 163
 164 static int ehci_platform_resume(struct device *dev)
 165 {
 166         struct usb_hcd *hcd = dev_get_drvdata(dev);
 167         struct usb_ehci_pdata *pdata = dev->platform_data;
 168         struct platform_device *pdev =
 169                 container_of(dev, struct platform_device, dev);
 170
 171         if (pdata->power_on) {
 172                 int err = pdata->power_on(pdev);
 173                 if (err < 0)
 174                         return err;
 175         }
 176
 177         ehci_resume(hcd, false);
 178         return 0;
 179 }
 180
 181 #else /* !CONFIG_PM */
 182 #define ehci_platform_suspend   NULL
 183 #define ehci_platform_resume    NULL
 184 #endif /* CONFIG_PM */
 185
 186 static const struct platform_device_id ehci_platform_table[] = {
 187         { "ehci-platform", 0 },
 188         { }
 189 };
 190 MODULE_DEVICE_TABLE(platform, ehci_platform_table);
 191
 192 static const struct dev_pm_ops ehci_platform_pm_ops = {
 193         .suspend        = ehci_platform_suspend,
 194         .resume         = ehci_platform_resume,
 195 };
 196
 197 static struct platform_driver ehci_platform_driver = {
 198         .id_table       = ehci_platform_table,
 199         .probe          = ehci_platform_probe,
 200         .remove         = ehci_platform_remove,
 201         .shutdown       = usb_hcd_platform_shutdown,
 202         .driver         = {
 203                 .owner  = THIS_MODULE,
 204                 .name   = "ehci-platform",
 205                 .pm     = &ehci_platform_pm_ops,
 206         }
 207 };
 208
 209 static int __init ehci_platform_init(void)
 210 {
 211         if (usb_disabled())
 212                 return -ENODEV;
 213
 214         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 215
 216         ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
 217         return platform_driver_register(&ehci_platform_driver);
 218 }
 219 module_init(ehci_platform_init);
 220
 221 static void __exit ehci_platform_cleanup(void)
 222 {
 223         platform_driver_unregister(&ehci_platform_driver);
 224 }
 225 module_exit(ehci_platform_cleanup);
 226
 227 MODULE_DESCRIPTION(DRIVER_DESC);
 228 MODULE_AUTHOR("Hauke Mehrtens");
 229 MODULE_AUTHOR("Alan Stern");
 230 MODULE_LICENSE("GPL");