target/linux/ar71xx/files/drivers/usb/host/ohci-ar71xx.c

   1 /*
   2  *  OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  *  Bus Glue for Atheros AR71xx built-in OHCI controller.
   5  *
   6  *  Copyright (C) 2008 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 #include <linux/delay.h>
  19
  20 extern int usb_disabled(void);
  21
  22 static int usb_hcd_ar71xx_probe(const struct hc_driver *driver,
  23                                 struct platform_device *pdev)
  24 {
  25         struct usb_hcd *hcd;
  26         struct resource *res;
  27         int irq;
  28         int ret;
  29
  30         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  31         if (!res) {
  32                 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
  33                         pdev->dev.bus_id);
  34                 return -ENODEV;
  35         }
  36         irq = res->start;
  37
  38         hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
  39         if (!hcd)
  40                 return -ENOMEM;
  41
  42         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  43         if (!res) {
  44                 dev_dbg(&pdev->dev, "no base address specified for %s\n",
  45                         pdev->dev.bus_id);
  46                 ret = -ENODEV;
  47                 goto err_put_hcd;
  48         }
  49         hcd->rsrc_start = res->start;
  50         hcd->rsrc_len   = res->end - res->start + 1;
  51
  52         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  53                 dev_dbg(&pdev->dev, "controller already in use\n");
  54                 ret = -EBUSY;
  55                 goto err_put_hcd;
  56         }
  57
  58         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  59         if (!hcd->regs) {
  60                 dev_dbg(&pdev->dev, "error mapping memory\n");
  61                 ret = -EFAULT;
  62                 goto err_release_region;
  63         }
  64
  65         ohci_hcd_init(hcd_to_ohci(hcd));
  66
  67         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
  68         if (ret)
  69                 goto err_stop_hcd;
  70
  71         return 0;
  72
  73  err_stop_hcd:
  74         iounmap(hcd->regs);
  75  err_release_region:
  76         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  77  err_put_hcd:
  78         usb_put_hcd(hcd);
  79         return ret;
  80 }
  81
  82 void usb_hcd_ar71xx_remove(struct usb_hcd *hcd, struct platform_device *pdev)
  83 {
  84         usb_remove_hcd(hcd);
  85         iounmap(hcd->regs);
  86         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  87         usb_put_hcd(hcd);
  88 }
  89
  90 static int __devinit ohci_ar71xx_start(struct usb_hcd *hcd)
  91 {
  92         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  93         int ret;
  94
  95         ret = ohci_init(ohci);
  96         if (ret < 0)
  97                 return ret;
  98
  99         ret = ohci_run(ohci);
 100         if (ret < 0)
 101                 goto err;
 102
 103         return 0;
 104
 105  err:
 106         ohci_stop(hcd);
 107         return ret;
 108 }
 109
 110 static const struct hc_driver ohci_ar71xx_hc_driver = {
 111         .description            = hcd_name,
 112         .product_desc           = "Atheros AR71xx built-in OHCI controller",
 113         .hcd_priv_size          = sizeof(struct ohci_hcd),
 114
 115         .irq                    = ohci_irq,
 116         .flags                  = HCD_USB11 | HCD_MEMORY,
 117
 118         .start                  = ohci_ar71xx_start,
 119         .stop                   = ohci_stop,
 120         .shutdown               = ohci_shutdown,
 121
 122         .urb_enqueue            = ohci_urb_enqueue,
 123         .urb_dequeue            = ohci_urb_dequeue,
 124         .endpoint_disable       = ohci_endpoint_disable,
 125
 126         /*
 127          * scheduling support
 128          */
 129         .get_frame_number       = ohci_get_frame,
 130
 131         /*
 132          * root hub support
 133          */
 134         .hub_status_data        = ohci_hub_status_data,
 135         .hub_control            = ohci_hub_control,
 136         .start_port_reset       = ohci_start_port_reset,
 137 };
 138
 139 static int ohci_hcd_ar71xx_drv_probe(struct platform_device *pdev)
 140 {
 141         if (usb_disabled())
 142                 return -ENODEV;
 143
 144         return usb_hcd_ar71xx_probe(&ohci_ar71xx_hc_driver, pdev);
 145 }
 146
 147 static int ohci_hcd_ar71xx_drv_remove(struct platform_device *pdev)
 148 {
 149         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 150
 151         usb_hcd_ar71xx_remove(hcd, pdev);
 152         return 0;
 153 }
 154
 155 MODULE_ALIAS("platform:ar71xx-ohci");
 156
 157 static struct platform_driver ohci_hcd_ar71xx_driver = {
 158         .probe          = ohci_hcd_ar71xx_drv_probe,
 159         .remove         = ohci_hcd_ar71xx_drv_remove,
 160         .shutdown       = usb_hcd_platform_shutdown,
 161         .driver         = {
 162                 .name   = "ar71xx-ohci",
 163                 .owner  = THIS_MODULE,
 164         },
 165 };