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

   1 /*
   2  * OHCI 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 OHCI 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_ohci(struct platform_device *pdev)
  18 {
  19 }
  20
  21 static void ar71xx_stop_ohci(struct platform_device *pdev)
  22 {
  23         /*
  24          * TODO: implement
  25          */
  26 }
  27
  28 int usb_hcd_ar71xx_probe(const struct hc_driver *driver,
  29                          struct platform_device *pdev)
  30 {
  31         struct usb_hcd *hcd;
  32         struct resource *res;
  33         int irq;
  34         int ret;
  35
  36         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  37         if (!res) {
  38                 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
  39                         pdev->dev.bus_id);
  40                 return -ENODEV;
  41         }
  42         irq = res->start;
  43
  44         hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
  45         if (!hcd)
  46                 return -ENOMEM;
  47
  48         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  49         if (!res) {
  50                 dev_dbg(&pdev->dev, "no base address specified for %s\n",
  51                         pdev->dev.bus_id);
  52                 ret = -ENODEV;
  53                 goto err_put_hcd;
  54         }
  55         hcd->rsrc_start = res->start;
  56         hcd->rsrc_len   = res->end - res->start + 1;
  57
  58         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  59                 dev_dbg(&pdev->dev, "controller already in use\n");
  60                 ret = -EBUSY;
  61                 goto err_put_hcd;
  62         }
  63
  64         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  65         if (!hcd->regs) {
  66                 dev_dbg(&pdev->dev, "error mapping memory\n");
  67                 ret = -EFAULT;
  68                 goto err_release_region;
  69         }
  70
  71         ar71xx_start_ohci(pdev);
  72         ohci_hcd_init(hcd_to_ohci(hcd));
  73
  74         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
  75         if (ret)
  76                 goto err_stop_hcd;
  77
  78         return 0;
  79
  80 err_stop_hcd:
  81         ar71xx_stop_ohci(pdev);
  82         iounmap(hcd->regs);
  83 err_release_region:
  84         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  85 err_put_hcd:
  86         usb_put_hcd(hcd);
  87         return ret;
  88 }
  89
  90
  91 /* may be called without controller electrically present */
  92 /* may be called with controller, bus, and devices active */
  93
  94 /**
  95  * usb_hcd_ar71xx_remove - shutdown processing for AR71xx HCDs
  96  * @dev: USB Host Controller being removed
  97  * Context: !in_interrupt()
  98  *
  99  * Reverses the effect of usb_hcd_ar71xx_probe(), first invoking
 100  * the HCD's stop() method.  It is always called from a thread
 101  * context, normally "rmmod", "apmd", or something similar.
 102  *
 103  */
 104 void usb_hcd_ar71xx_remove(struct usb_hcd *hcd, struct platform_device *pdev)
 105 {
 106         usb_remove_hcd(hcd);
 107         ar71xx_stop_ohci(pdev);
 108         iounmap(hcd->regs);
 109         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 110         usb_put_hcd(hcd);
 111 }
 112
 113 static int __devinit ohci_ar71xx_start(struct usb_hcd *hcd)
 114 {
 115         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 116         int ret;
 117
 118         ret = ohci_init(ohci);
 119         if (ret < 0)
 120                 return ret;
 121
 122         ret = ohci_run(ohci);
 123         if (ret < 0)
 124                 goto err;
 125
 126         return 0;
 127
 128 err:
 129         ohci_stop(hcd);
 130         return ret;
 131 }
 132
 133 static const struct hc_driver ohci_ar71xx_hc_driver = {
 134         .description    = hcd_name,
 135         .product_desc   = "Atheros AR71xx built-in OHCI controller",
 136         .hcd_priv_size  = sizeof(struct ohci_hcd),
 137
 138         /*
 139          * generic hardware linkage
 140          */
 141         .irq            = ohci_irq,
 142         .flags          = HCD_USB11 | HCD_MEMORY,
 143
 144         /*
 145          * basic lifecycle operations
 146          */
 147         .start          = ohci_ar71xx_start,
 148         .stop           = ohci_stop,
 149         .shutdown       = ohci_shutdown,
 150
 151         /*
 152          * managing i/o requests and associated device resources
 153          */
 154         .urb_enqueue            = ohci_urb_enqueue,
 155         .urb_dequeue            = ohci_urb_dequeue,
 156         .endpoint_disable       = ohci_endpoint_disable,
 157
 158         /*
 159          * scheduling support
 160          */
 161         .get_frame_number       = ohci_get_frame,
 162
 163         /*
 164          * root hub support
 165          */
 166         .hub_status_data        = ohci_hub_status_data,
 167         .hub_control            = ohci_hub_control,
 168         .start_port_reset       = ohci_start_port_reset,
 169 };
 170
 171 static int ohci_hcd_ar71xx_drv_probe(struct platform_device *pdev)
 172 {
 173         int ret;
 174
 175         ret = -ENODEV;
 176         if (!usb_disabled())
 177                 ret = usb_hcd_ar71xx_probe(&ohci_ar71xx_hc_driver, pdev);
 178
 179         return ret;
 180 }
 181
 182 static int ohci_hcd_ar71xx_drv_remove(struct platform_device *pdev)
 183 {
 184         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 185
 186         usb_hcd_ar71xx_remove(hcd, pdev);
 187         return 0;
 188 }
 189
 190 static struct platform_driver ohci_hcd_ar71xx_driver = {
 191         .probe          = ohci_hcd_ar71xx_drv_probe,
 192         .remove         = ohci_hcd_ar71xx_drv_remove,
 193         .shutdown       = usb_hcd_platform_shutdown,
 194         .driver         = {
 195                 .name   = "ar71xx-ohci",
 196                 .owner  = THIS_MODULE,
 197         },
 198 };
 199
 200 MODULE_ALIAS("ar71xx-ohci");