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

   1 /*
   2  * EHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * Copyright (C) 2007 Atheros Communications, Inc.
   5  * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
   6  * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   7  *
   8  * Bus Glue for Atheros AR71xx built-in EHCI controller
   9  *
  10  */
  11
  12 #include <linux/platform_device.h>
  13 #include <linux/delay.h>
  14
  15 extern int usb_disabled(void);
  16
  17 static void ar71xx_start_ehci(struct platform_device *pdev)
  18 {
  19 }
  20
  21 static void ar71xx_stop_ehci(struct platform_device *pdev)
  22 {
  23         /*
  24          * TODO: implement
  25          */
  26 }
  27
  28 int usb_ehci_ar71xx_probe(const struct hc_driver *driver,
  29                           struct usb_hcd **hcd_out,
  30                           struct platform_device *pdev)
  31 {
  32         struct usb_hcd *hcd;
  33         struct ehci_hcd *ehci;
  34         struct resource *res;
  35         int irq;
  36         int ret;
  37
  38         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  39         if (!res) {
  40                 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
  41                         pdev->dev.bus_id);
  42                 return -ENODEV;
  43         }
  44         irq = res->start;
  45
  46         hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
  47         if (!hcd)
  48                 return -ENOMEM;
  49
  50         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  51         if (!res) {
  52                 dev_dbg(&pdev->dev, "no base address specified for %s\n",
  53                         pdev->dev.bus_id);
  54                 ret = -ENODEV;
  55                 goto err_put_hcd;
  56         }
  57         hcd->rsrc_start = res->start;
  58         hcd->rsrc_len   = res->end - res->start + 1;
  59
  60         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  61                 dev_dbg(&pdev->dev, "controller already in use\n");
  62                 ret = -EBUSY;
  63                 goto err_put_hcd;
  64         }
  65
  66         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  67         if (!hcd->regs) {
  68                 dev_dbg(&pdev->dev, "error mapping memory\n");
  69                 ret = -EFAULT;
  70                 goto err_release_region;
  71         }
  72
  73         ar71xx_start_ehci(pdev);
  74
  75         ehci            = hcd_to_ehci(hcd);
  76         ehci->caps      = hcd->regs;
  77         ehci->regs      = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
  78         ehci->hcs_params = readl(&ehci->caps->hcs_params);
  79
  80         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
  81         if (ret)
  82                 goto err_stop_ehc;
  83
  84         return 0;
  85
  86 err_stop_ehc:
  87         ar71xx_stop_ehci(pdev);
  88         iounmap(hcd->regs);
  89
  90 err_release_region:
  91         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  92 err_put_hcd:
  93         usb_put_hcd(hcd);
  94         return ret;
  95 }
  96
  97 /* may be called without controller electrically present */
  98 /* may be called with controller, bus, and devices active */
  99
 100 /**
 101  * usb_ehci_ar71xx_remove - shutdown processing for AR71xx-based HCDs
 102  * @dev: USB Host Controller being removed
 103  * Context: !in_interrupt()
 104  *
 105  * Reverses the effect of usb_hcd_ar71xx_probe(), first invoking
 106  * the HCD's stop() method.  It is always called from a thread
 107  * context, normally "rmmod", "apmd", or something similar.
 108  *
 109  */
 110 static void usb_ehci_ar71xx_remove(struct usb_hcd *hcd,
 111                                    struct platform_device *pdev)
 112 {
 113         usb_remove_hcd(hcd);
 114         ar71xx_stop_ehci(pdev);
 115         iounmap(hcd->regs);
 116         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 117         usb_put_hcd(hcd);
 118 }
 119
 120 static const struct hc_driver ehci_ar71xx_hc_driver = {
 121         .description    = hcd_name,
 122         .product_desc   = "Atheros AR71xx built-in EHCI controller",
 123         .hcd_priv_size  = sizeof(struct ehci_hcd),
 124         /*
 125          * generic hardware linkage
 126          */
 127         .irq            = ehci_irq,
 128         .flags          = HCD_MEMORY | HCD_USB2,
 129
 130         /*
 131          * basic lifecycle operations
 132          */
 133         .reset          = ehci_init,
 134         .start          = ehci_run,
 135         .stop           = ehci_stop,
 136         .shutdown       = ehci_shutdown,
 137
 138         /*
 139          * managing i/o requests and associated device resources
 140          */
 141         .urb_enqueue            = ehci_urb_enqueue,
 142         .urb_dequeue            = ehci_urb_dequeue,
 143         .endpoint_disable       = ehci_endpoint_disable,
 144
 145         /*
 146          * scheduling support
 147          */
 148         .get_frame_number = ehci_get_frame,
 149
 150         /*
 151          * root hub support
 152          */
 153         .hub_status_data        = ehci_hub_status_data,
 154         .hub_control            = ehci_hub_control,
 155 #ifdef CONFIG_PM
 156         .hub_suspend            = ehci_hub_suspend,
 157         .hub_resume             = ehci_hub_resume,
 158 #endif
 159 };
 160
 161 static int ehci_hcd_ar71xx_drv_probe(struct platform_device *pdev)
 162 {
 163         struct usb_hcd *hcd = NULL;
 164         int ret;
 165
 166         ret = -ENODEV;
 167         if (!usb_disabled())
 168                 ret = usb_ehci_ar71xx_probe(&ehci_ar71xx_hc_driver, &hcd, pdev);
 169
 170         return ret;
 171 }
 172
 173 static int ehci_hcd_ar71xx_drv_remove(struct platform_device *pdev)
 174 {
 175         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 176
 177         usb_ehci_ar71xx_remove(hcd, pdev);
 178         return 0;
 179 }
 180
 181 static struct platform_driver ehci_hcd_ar71xx_driver = {
 182         .probe          = ehci_hcd_ar71xx_drv_probe,
 183         .remove         = ehci_hcd_ar71xx_drv_remove,
 184         .shutdown       = usb_hcd_platform_shutdown,
 185         .driver = {
 186                 .name   = "ar71xx-ehci",
 187                 .bus    = &platform_bus_type
 188         }
 189 };
 190
 191 MODULE_ALIAS("ar71xx-ehci");