target/linux/ramips/files/drivers/usb/host/ohci-rt3883.c

   1 /*
   2  *  Bus Glue for the built-in OHCI controller of the Ralink RT3662/RT3883 SoCs
   3  *
   4  *  Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  Parts of this file are based on Ralink's 2.6.21 BSP
   7  *
   8  *  This program is free software; you can redistribute it and/or modify it
   9  *  under the terms of the GNU General Public License version 2 as published
  10  *  by the Free Software Foundation.
  11  */
  12
  13 #include <linux/platform_device.h>
  14 #include <asm/mach-ralink/rt3883.h>
  15 #include <asm/mach-ralink/rt3883_ohci_platform.h>
  16
  17 static int __devinit ohci_rt3883_start(struct usb_hcd *hcd)
  18 {
  19         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  20         int ret;
  21
  22         ret = ohci_init(ohci);
  23         if (ret < 0)
  24                 return ret;
  25
  26         ret = ohci_run(ohci);
  27         if (ret < 0)
  28                 goto err;
  29
  30         return 0;
  31
  32 err:
  33         ohci_stop(hcd);
  34         return ret;
  35 }
  36
  37 static const struct hc_driver ohci_rt3883_hc_driver = {
  38         .description            = hcd_name,
  39         .product_desc           = "Ralink RT3883 built-in OHCI controller",
  40         .hcd_priv_size          = sizeof(struct ohci_hcd),
  41
  42         .irq                    = ohci_irq,
  43         .flags                  = HCD_USB11 | HCD_MEMORY,
  44
  45         .start                  = ohci_rt3883_start,
  46         .stop                   = ohci_stop,
  47         .shutdown               = ohci_shutdown,
  48
  49         .urb_enqueue            = ohci_urb_enqueue,
  50         .urb_dequeue            = ohci_urb_dequeue,
  51         .endpoint_disable       = ohci_endpoint_disable,
  52
  53         /*
  54          * scheduling support
  55          */
  56         .get_frame_number       = ohci_get_frame,
  57
  58         /*
  59          * root hub support
  60          */
  61         .hub_status_data        = ohci_hub_status_data,
  62         .hub_control            = ohci_hub_control,
  63         .start_port_reset       = ohci_start_port_reset,
  64 };
  65
  66 static int ohci_rt3883_probe(struct platform_device *pdev)
  67 {
  68         struct rt3883_ohci_platform_data *pdata;
  69         struct usb_hcd *hcd;
  70         struct resource *res;
  71         int irq;
  72         int ret;
  73
  74         if (usb_disabled())
  75                 return -ENODEV;
  76
  77         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  78         if (!res) {
  79                 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
  80                         dev_name(&pdev->dev));
  81                 return -ENODEV;
  82         }
  83         irq = res->start;
  84
  85         hcd = usb_create_hcd(&ohci_rt3883_hc_driver,
  86                              &pdev->dev, 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 for %s\n",
  93                         dev_name(&pdev->dev));
  94                 ret = -ENODEV;
  95                 goto err_put_hcd;
  96         }
  97         hcd->rsrc_start = res->start;
  98         hcd->rsrc_len   = res->end - res->start + 1;
  99
 100         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 101                 dev_dbg(&pdev->dev, "controller already in use\n");
 102                 ret = -EBUSY;
 103                 goto err_put_hcd;
 104         }
 105
 106         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 107         if (!hcd->regs) {
 108                 dev_dbg(&pdev->dev, "error mapping memory\n");
 109                 ret = -EFAULT;
 110                 goto err_release_region;
 111         }
 112
 113         pdata = pdev->dev.platform_data;
 114         if (pdata && pdata->start_hw)
 115                 pdata->start_hw();
 116
 117         ohci_hcd_init(hcd_to_ohci(hcd));
 118
 119         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 120         if (ret)
 121                 goto err_stop_hcd;
 122
 123         return 0;
 124
 125 err_stop_hcd:
 126         iounmap(hcd->regs);
 127 err_release_region:
 128         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 129 err_put_hcd:
 130         usb_put_hcd(hcd);
 131         return ret;
 132 }
 133
 134 static int ohci_rt3883_remove(struct platform_device *pdev)
 135 {
 136         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 137         struct rt3883_ohci_platform_data *pdata;
 138
 139         usb_remove_hcd(hcd);
 140         iounmap(hcd->regs);
 141         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 142         usb_put_hcd(hcd);
 143
 144         pdata = pdev->dev.platform_data;
 145         if (pdata && pdata->stop_hw)
 146                 pdata->stop_hw();
 147
 148         return 0;
 149 }
 150
 151 static struct platform_driver ohci_rt3883_driver = {
 152         .probe          = ohci_rt3883_probe,
 153         .remove         = ohci_rt3883_remove,
 154         .shutdown       = usb_hcd_platform_shutdown,
 155         .driver         = {
 156                 .name   = "rt3883-ohci",
 157                 .owner  = THIS_MODULE,
 158         },
 159 };
 160
 161 MODULE_ALIAS("platform:rt3883-ohci");