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 #include <asm/mach-ar71xx/platform.h>
  19
  20 extern int usb_disabled(void);
  21
  22 static void ehci_ar71xx_setup(void)
  23 {
  24         /*
  25          * TODO: implement
  26          */
  27 }
  28
  29 static int ehci_ar71xx_probe(const struct hc_driver *driver,
  30                              struct usb_hcd **hcd_out,
  31                              struct platform_device *pdev)
  32 {
  33         struct usb_hcd *hcd;
  34         struct ehci_hcd *ehci;
  35         struct resource *res;
  36         int irq;
  37         int ret;
  38
  39         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  40         if (!res) {
  41                 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
  42                         pdev->dev.bus_id);
  43                 return -ENODEV;
  44         }
  45         irq = res->start;
  46
  47         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  48         if (!res) {
  49                 dev_dbg(&pdev->dev, "no base address specified for %s\n",
  50                         pdev->dev.bus_id);
  51                 return -ENODEV;
  52         }
  53
  54         hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
  55         if (!hcd)
  56                 return -ENOMEM;
  57
  58         hcd->rsrc_start = res->start;
  59         hcd->rsrc_len   = res->end - res->start + 1;
  60
  61         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  62                 dev_dbg(&pdev->dev, "controller already in use\n");
  63                 ret = -EBUSY;
  64                 goto err_put_hcd;
  65         }
  66
  67         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  68         if (!hcd->regs) {
  69                 dev_dbg(&pdev->dev, "error mapping memory\n");
  70                 ret = -EFAULT;
  71                 goto err_release_region;
  72         }
  73
  74         ehci = hcd_to_ehci(hcd);
  75         ehci->caps = hcd->regs;
  76         ehci->regs = hcd->regs +
  77                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  78         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  79
  80         ehci_ar71xx_setup();
  81
  82         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
  83         if (ret)
  84                 goto err_iounmap;
  85
  86         return 0;
  87
  88  err_iounmap:
  89         iounmap(hcd->regs);
  90
  91  err_release_region:
  92         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  93  err_put_hcd:
  94         usb_put_hcd(hcd);
  95         return ret;
  96 }
  97
  98 static void ehci_ar71xx_remove(struct usb_hcd *hcd,
  99                                struct platform_device *pdev)
 100 {
 101         usb_remove_hcd(hcd);
 102         iounmap(hcd->regs);
 103         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 104         usb_put_hcd(hcd);
 105 }
 106
 107 static const struct hc_driver ehci_ar71xx_hc_driver = {
 108         .description            = hcd_name,
 109         .product_desc           = "Atheros AR71xx built-in EHCI controller",
 110         .hcd_priv_size          = sizeof(struct ehci_hcd),
 111
 112         /*
 113          * generic hardware linkage
 114          */
 115         .irq                    = ehci_irq,
 116         .flags                  = HCD_MEMORY | HCD_USB2,
 117
 118         /*
 119          * basic lifecycle operations
 120          */
 121         .reset                  = ehci_init,
 122         .start                  = ehci_run,
 123         .stop                   = ehci_stop,
 124         .shutdown               = ehci_shutdown,
 125
 126         /*
 127          * managing i/o requests and associated device resources
 128          */
 129         .urb_enqueue            = ehci_urb_enqueue,
 130         .urb_dequeue            = ehci_urb_dequeue,
 131         .endpoint_disable       = ehci_endpoint_disable,
 132
 133         /*
 134          * scheduling support
 135          */
 136         .get_frame_number       = ehci_get_frame,
 137
 138         /*
 139          * root hub support
 140          */
 141         .hub_status_data        = ehci_hub_status_data,
 142         .hub_control            = ehci_hub_control,
 143 #ifdef CONFIG_PM
 144         .hub_suspend            = ehci_hub_suspend,
 145         .hub_resume             = ehci_hub_resume,
 146 #endif
 147 };
 148
 149 static int ehci_ar71xx_driver_probe(struct platform_device *pdev)
 150 {
 151         struct usb_hcd *hcd = NULL;
 152
 153         if (usb_disabled())
 154                 return -ENODEV;
 155
 156         return ehci_ar71xx_probe(&ehci_ar71xx_hc_driver, &hcd, pdev);
 157 }
 158
 159 static int ehci_ar71xx_driver_remove(struct platform_device *pdev)
 160 {
 161         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 162
 163         ehci_ar71xx_remove(hcd, pdev);
 164         return 0;
 165 }
 166
 167 MODULE_ALIAS("platform:ar71xx-ehci");
 168
 169 static struct platform_driver ehci_ar71xx_driver = {
 170         .probe          = ehci_ar71xx_driver_probe,
 171         .remove         = ehci_ar71xx_driver_remove,
 172         .driver = {
 173                 .name   = "ar71xx-ehci",
 174         }
 175 };