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

   1 /*
   2  *  Bus Glue for Atheros AR71xx built-in EHCI controller.
   3  *
   4  *  Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Parts of this file are based on Atheros' 2.6.15 BSP
   8  *      Copyright (C) 2007 Atheros Communications, Inc.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License version 2 as published
  12  *  by the Free Software Foundation.
  13  */
  14
  15 #include <linux/platform_device.h>
  16 #include <linux/delay.h>
  17
  18 extern int usb_disabled(void);
  19
  20 static void ehci_ar71xx_setup(void)
  21 {
  22         /*
  23          * TODO: implement
  24          */
  25 }
  26
  27 static int ehci_ar71xx_probe(const struct hc_driver *driver,
  28                              struct usb_hcd **hcd_out,
  29                              struct platform_device *pdev)
  30 {
  31         struct usb_hcd *hcd;
  32         struct ehci_hcd *ehci;
  33         struct resource *res;
  34         int irq;
  35         int ret;
  36
  37         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  38         if (!res) {
  39                 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
  40                         pdev->dev.bus_id);
  41                 return -ENODEV;
  42         }
  43         irq = res->start;
  44
  45         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  46         if (!res) {
  47                 dev_dbg(&pdev->dev, "no base address specified for %s\n",
  48                         pdev->dev.bus_id);
  49                 return -ENODEV;
  50         }
  51
  52         hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
  53         if (!hcd)
  54                 return -ENOMEM;
  55
  56         hcd->rsrc_start = res->start;
  57         hcd->rsrc_len   = res->end - res->start + 1;
  58
  59         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  60                 dev_dbg(&pdev->dev, "controller already in use\n");
  61                 ret = -EBUSY;
  62                 goto err_put_hcd;
  63         }
  64
  65         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  66         if (!hcd->regs) {
  67                 dev_dbg(&pdev->dev, "error mapping memory\n");
  68                 ret = -EFAULT;
  69                 goto err_release_region;
  70         }
  71
  72         ehci = hcd_to_ehci(hcd);
  73         ehci->caps = hcd->regs;
  74         ehci->regs = hcd->regs +
  75                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  76         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  77
  78         ehci_ar71xx_setup();
  79
  80         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
  81         if (ret)
  82                 goto err_iounmap;
  83
  84         return 0;
  85
  86  err_iounmap:
  87         iounmap(hcd->regs);
  88
  89  err_release_region:
  90         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  91  err_put_hcd:
  92         usb_put_hcd(hcd);
  93         return ret;
  94 }
  95
  96 static void ehci_ar71xx_remove(struct usb_hcd *hcd,
  97                                struct platform_device *pdev)
  98 {
  99         usb_remove_hcd(hcd);
 100         iounmap(hcd->regs);
 101         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 102         usb_put_hcd(hcd);
 103 }
 104
 105 static const struct hc_driver ehci_ar71xx_hc_driver = {
 106         .description            = hcd_name,
 107         .product_desc           = "Atheros AR71xx built-in EHCI controller",
 108         .hcd_priv_size          = sizeof(struct ehci_hcd),
 109
 110         /*
 111          * generic hardware linkage
 112          */
 113         .irq                    = ehci_irq,
 114         .flags                  = HCD_MEMORY | HCD_USB2,
 115
 116         /*
 117          * basic lifecycle operations
 118          */
 119         .reset                  = ehci_init,
 120         .start                  = ehci_run,
 121         .stop                   = ehci_stop,
 122         .shutdown               = ehci_shutdown,
 123
 124         /*
 125          * managing i/o requests and associated device resources
 126          */
 127         .urb_enqueue            = ehci_urb_enqueue,
 128         .urb_dequeue            = ehci_urb_dequeue,
 129         .endpoint_disable       = ehci_endpoint_disable,
 130
 131         /*
 132          * scheduling support
 133          */
 134         .get_frame_number       = ehci_get_frame,
 135
 136         /*
 137          * root hub support
 138          */
 139         .hub_status_data        = ehci_hub_status_data,
 140         .hub_control            = ehci_hub_control,
 141 #ifdef CONFIG_PM
 142         .hub_suspend            = ehci_hub_suspend,
 143         .hub_resume             = ehci_hub_resume,
 144 #endif
 145 };
 146
 147 static int ehci_ar71xx_driver_probe(struct platform_device *pdev)
 148 {
 149         struct usb_hcd *hcd = NULL;
 150
 151         if (usb_disabled())
 152                 return -ENODEV;
 153
 154         return ehci_ar71xx_probe(&ehci_ar71xx_hc_driver, &hcd, pdev);
 155 }
 156
 157 static int ehci_ar71xx_driver_remove(struct platform_device *pdev)
 158 {
 159         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 160
 161         ehci_ar71xx_remove(hcd, pdev);
 162         return 0;
 163 }
 164
 165 MODULE_ALIAS("platform:ar71xx-ehci");
 166
 167 static struct platform_driver ehci_ar71xx_driver = {
 168         .probe          = ehci_ar71xx_driver_probe,
 169         .remove         = ehci_ar71xx_driver_remove,
 170         .driver = {
 171                 .name   = "ar71xx-ehci",
 172         }
 173 };