drivers/usb/host/ohci-ath79.c

   1 /*
   2  *  OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  *  Bus Glue for Atheros AR71XX/AR724X built-in OHCI controller.
   5  *
   6  *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
   7  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   8  *
   9  *  Parts of this file are based on Atheros' 2.6.15 BSP
  10  *      Copyright (C) 2007 Atheros Communications, Inc.
  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
  17 #include <linux/platform_device.h>
  18
  19 static int __devinit ohci_ath79_start(struct usb_hcd *hcd)
  20 {
  21         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  22         int ret;
  23
  24         ret = ohci_init(ohci);
  25         if (ret < 0)
  26                 return ret;
  27
  28         ret = ohci_run(ohci);
  29         if (ret < 0)
  30                 goto err;
  31
  32         return 0;
  33
  34 err:
  35         ohci_stop(hcd);
  36         return ret;
  37 }
  38
  39 static const struct hc_driver ohci_ath79_hc_driver = {
  40         .description            = hcd_name,
  41         .product_desc           = "Atheros built-in OHCI controller",
  42         .hcd_priv_size          = sizeof(struct ohci_hcd),
  43
  44         .irq                    = ohci_irq,
  45         .flags                  = HCD_USB11 | HCD_MEMORY,
  46
  47         .start                  = ohci_ath79_start,
  48         .stop                   = ohci_stop,
  49         .shutdown               = ohci_shutdown,
  50
  51         .urb_enqueue            = ohci_urb_enqueue,
  52         .urb_dequeue            = ohci_urb_dequeue,
  53         .endpoint_disable       = ohci_endpoint_disable,
  54
  55         /*
  56          * scheduling support
  57          */
  58         .get_frame_number       = ohci_get_frame,
  59
  60         /*
  61          * root hub support
  62          */
  63         .hub_status_data        = ohci_hub_status_data,
  64         .hub_control            = ohci_hub_control,
  65         .start_port_reset       = ohci_start_port_reset,
  66 };
  67
  68 static int ohci_ath79_probe(struct platform_device *pdev)
  69 {
  70         struct usb_hcd *hcd;
  71         struct resource *res;
  72         int irq;
  73         int ret;
  74
  75         if (usb_disabled())
  76                 return -ENODEV;
  77
  78         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  79         if (!res) {
  80                 dev_dbg(&pdev->dev, "no IRQ specified\n");
  81                 return -ENODEV;
  82         }
  83         irq = res->start;
  84
  85         hcd = usb_create_hcd(&ohci_ath79_hc_driver, &pdev->dev,
  86                              dev_name(&pdev->dev));
  87         if (!hcd)
  88                 return -ENOMEM;
  89
  90         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  91         if (!res) {
  92                 dev_dbg(&pdev->dev, "no base address specified\n");
  93                 ret = -ENODEV;
  94                 goto err_put_hcd;
  95         }
  96         hcd->rsrc_start = res->start;
  97         hcd->rsrc_len = resource_size(res);
  98
  99         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 100                 dev_dbg(&pdev->dev, "controller already in use\n");
 101                 ret = -EBUSY;
 102                 goto err_put_hcd;
 103         }
 104
 105         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 106         if (!hcd->regs) {
 107                 dev_dbg(&pdev->dev, "error mapping memory\n");
 108                 ret = -EFAULT;
 109                 goto err_release_region;
 110         }
 111
 112         ohci_hcd_init(hcd_to_ohci(hcd));
 113
 114         ret = usb_add_hcd(hcd, irq, 0);
 115         if (ret)
 116                 goto err_stop_hcd;
 117
 118         return 0;
 119
 120 err_stop_hcd:
 121         iounmap(hcd->regs);
 122 err_release_region:
 123         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 124 err_put_hcd:
 125         usb_put_hcd(hcd);
 126         return ret;
 127 }
 128
 129 static int ohci_ath79_remove(struct platform_device *pdev)
 130 {
 131         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 132
 133         usb_remove_hcd(hcd);
 134         iounmap(hcd->regs);
 135         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 136         usb_put_hcd(hcd);
 137
 138         return 0;
 139 }
 140
 141 static struct platform_driver ohci_hcd_ath79_driver = {
 142         .probe          = ohci_ath79_probe,
 143         .remove         = ohci_ath79_remove,
 144         .shutdown       = usb_hcd_platform_shutdown,
 145         .driver         = {
 146                 .name   = "ath79-ohci",
 147                 .owner  = THIS_MODULE,
 148         },
 149 };
 150
 151 MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ath79-ohci");