drivers/usb/host/ohci-ep93xx.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  * (C) Copyright 2002 Hewlett-Packard Company
   7  *
   8  * Bus Glue for ep93xx.
   9  *
  10  * Written by Christopher Hoover <ch@hpl.hp.com>
  11  * Based on fragments of previous driver by Russell King et al.
  12  *
  13  * Modified for LH7A404 from ohci-sa1111.c
  14  *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
  15  *
  16  * Modified for pxa27x from ohci-lh7a404.c
  17  *  by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
  18  *
  19  * Modified for ep93xx from ohci-pxa27x.c
  20  *  by Lennert Buytenhek <buytenh@wantstofly.org> 28-2-2006
  21  *  Based on an earlier driver by Ray Lehtiniemi
  22  *
  23  * This file is licenced under the GPL.
  24  */
  25
  26 #include <linux/clk.h>
  27 #include <linux/device.h>
  28 #include <linux/io.h>
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/signal.h>
  33 #include <linux/usb.h>
  34 #include <linux/usb/hcd.h>
  35
  36 #include "ohci.h"
  37
  38 #define DRIVER_DESC "OHCI EP93xx driver"
  39
  40 static const char hcd_name[] = "ohci-ep93xx";
  41
  42 static struct hc_driver __read_mostly ohci_ep93xx_hc_driver;
  43
  44 static struct clk *usb_host_clock;
  45
  46 static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
  47 {
  48         struct usb_hcd *hcd;
  49         struct resource *res;
  50         int irq;
  51         int ret;
  52
  53         if (usb_disabled())
  54                 return -ENODEV;
  55
  56         irq = platform_get_irq(pdev, 0);
  57         if (irq < 0)
  58                 return irq;
  59
  60         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  61         if (!res)
  62                 return -ENXIO;
  63
  64         hcd = usb_create_hcd(&ohci_ep93xx_hc_driver, &pdev->dev, "ep93xx");
  65         if (!hcd)
  66                 return -ENOMEM;
  67
  68         hcd->rsrc_start = res->start;
  69         hcd->rsrc_len = resource_size(res);
  70
  71         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
  72         if (IS_ERR(hcd->regs)) {
  73                 ret = PTR_ERR(hcd->regs);
  74                 goto err_put_hcd;
  75         }
  76
  77         usb_host_clock = devm_clk_get(&pdev->dev, NULL);
  78         if (IS_ERR(usb_host_clock)) {
  79                 ret = PTR_ERR(usb_host_clock);
  80                 goto err_put_hcd;
  81         }
  82
  83         clk_enable(usb_host_clock);
  84
  85         ret = usb_add_hcd(hcd, irq, 0);
  86         if (ret)
  87                 goto err_clk_disable;
  88
  89         return 0;
  90
  91 err_clk_disable:
  92         clk_disable(usb_host_clock);
  93 err_put_hcd:
  94         usb_put_hcd(hcd);
  95
  96         return ret;
  97 }
  98
  99 static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
 100 {
 101         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 102
 103         usb_remove_hcd(hcd);
 104         clk_disable(usb_host_clock);
 105         usb_put_hcd(hcd);
 106
 107         return 0;
 108 }
 109
 110 #ifdef CONFIG_PM
 111 static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
 112 {
 113         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 114         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 115
 116         if (time_before(jiffies, ohci->next_statechange))
 117                 msleep(5);
 118         ohci->next_statechange = jiffies;
 119
 120         clk_disable(usb_host_clock);
 121         return 0;
 122 }
 123
 124 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
 125 {
 126         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 127         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 128
 129         if (time_before(jiffies, ohci->next_statechange))
 130                 msleep(5);
 131         ohci->next_statechange = jiffies;
 132
 133         clk_enable(usb_host_clock);
 134
 135         ohci_resume(hcd, false);
 136         return 0;
 137 }
 138 #endif
 139
 140 static struct platform_driver ohci_hcd_ep93xx_driver = {
 141         .probe          = ohci_hcd_ep93xx_drv_probe,
 142         .remove         = ohci_hcd_ep93xx_drv_remove,
 143         .shutdown       = usb_hcd_platform_shutdown,
 144 #ifdef CONFIG_PM
 145         .suspend        = ohci_hcd_ep93xx_drv_suspend,
 146         .resume         = ohci_hcd_ep93xx_drv_resume,
 147 #endif
 148         .driver         = {
 149                 .name   = "ep93xx-ohci",
 150                 .owner  = THIS_MODULE,
 151         },
 152 };
 153
 154 static int __init ohci_ep93xx_init(void)
 155 {
 156         if (usb_disabled())
 157                 return -ENODEV;
 158
 159         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 160
 161         ohci_init_driver(&ohci_ep93xx_hc_driver, NULL);
 162         return platform_driver_register(&ohci_hcd_ep93xx_driver);
 163 }
 164 module_init(ohci_ep93xx_init);
 165
 166 static void __exit ohci_ep93xx_cleanup(void)
 167 {
 168         platform_driver_unregister(&ohci_hcd_ep93xx_driver);
 169 }
 170 module_exit(ohci_ep93xx_cleanup);
 171
 172 MODULE_DESCRIPTION(DRIVER_DESC);
 173 MODULE_LICENSE("GPL");
 174 MODULE_ALIAS("platform:ep93xx-ohci");