drivers/usb/host/ehci-ixp4xx.c

   1 /*
   2  * IXP4XX EHCI Host Controller Driver
   3  *
   4  * Author: Vladimir Barinov <vbarinov@embeddedalley.com>
   5  *
   6  * Based on "ehci-fsl.c" by Randy Vinson <rvinson@mvista.com>
   7  *
   8  * 2007 (c) MontaVista Software, Inc. This file is licensed under
   9  * the terms of the GNU General Public License version 2. This program
  10  * is licensed "as is" without any warranty of any kind, whether express
  11  * or implied.
  12  */
  13
  14 #include <linux/platform_device.h>
  15
  16 static int ixp4xx_ehci_init(struct usb_hcd *hcd)
  17 {
  18         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  19         int retval = 0;
  20
  21         ehci->big_endian_desc = 1;
  22         ehci->big_endian_mmio = 1;
  23
  24         ehci->caps = hcd->regs + 0x100;
  25
  26         hcd->has_tt = 1;
  27
  28         retval = ehci_setup(hcd);
  29         if (retval)
  30                 return retval;
  31
  32         ehci_port_power(ehci, 0);
  33
  34         return retval;
  35 }
  36
  37 static const struct hc_driver ixp4xx_ehci_hc_driver = {
  38         .description            = hcd_name,
  39         .product_desc           = "IXP4XX EHCI Host Controller",
  40         .hcd_priv_size          = sizeof(struct ehci_hcd),
  41         .irq                    = ehci_irq,
  42         .flags                  = HCD_MEMORY | HCD_USB2,
  43         .reset                  = ixp4xx_ehci_init,
  44         .start                  = ehci_run,
  45         .stop                   = ehci_stop,
  46         .shutdown               = ehci_shutdown,
  47         .urb_enqueue            = ehci_urb_enqueue,
  48         .urb_dequeue            = ehci_urb_dequeue,
  49         .endpoint_disable       = ehci_endpoint_disable,
  50         .endpoint_reset         = ehci_endpoint_reset,
  51         .get_frame_number       = ehci_get_frame,
  52         .hub_status_data        = ehci_hub_status_data,
  53         .hub_control            = ehci_hub_control,
  54 #if defined(CONFIG_PM)
  55         .bus_suspend            = ehci_bus_suspend,
  56         .bus_resume             = ehci_bus_resume,
  57 #endif
  58         .relinquish_port        = ehci_relinquish_port,
  59         .port_handed_over       = ehci_port_handed_over,
  60
  61         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  62 };
  63
  64 static int ixp4xx_ehci_probe(struct platform_device *pdev)
  65 {
  66         struct usb_hcd *hcd;
  67         const struct hc_driver *driver = &ixp4xx_ehci_hc_driver;
  68         struct resource *res;
  69         int irq;
  70         int retval;
  71
  72         if (usb_disabled())
  73                 return -ENODEV;
  74
  75         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  76         if (!res) {
  77                 dev_err(&pdev->dev,
  78                         "Found HC with no IRQ. Check %s setup!\n",
  79                         dev_name(&pdev->dev));
  80                 return -ENODEV;
  81         }
  82         irq = res->start;
  83
  84         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  85         if (!hcd) {
  86                 retval = -ENOMEM;
  87                 goto fail_create_hcd;
  88         }
  89
  90         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  91         if (!res) {
  92                 dev_err(&pdev->dev,
  93                         "Found HC with no register addr. Check %s setup!\n",
  94                         dev_name(&pdev->dev));
  95                 retval = -ENODEV;
  96                 goto fail_request_resource;
  97         }
  98         hcd->rsrc_start = res->start;
  99         hcd->rsrc_len = resource_size(res);
 100
 101         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 102                                 driver->description)) {
 103                 dev_dbg(&pdev->dev, "controller already in use\n");
 104                 retval = -EBUSY;
 105                 goto fail_request_resource;
 106         }
 107
 108         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 109         if (hcd->regs == NULL) {
 110                 dev_dbg(&pdev->dev, "error mapping memory\n");
 111                 retval = -EFAULT;
 112                 goto fail_ioremap;
 113         }
 114
 115         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 116         if (retval)
 117                 goto fail_add_hcd;
 118
 119         return retval;
 120
 121 fail_add_hcd:
 122         iounmap(hcd->regs);
 123 fail_ioremap:
 124         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 125 fail_request_resource:
 126         usb_put_hcd(hcd);
 127 fail_create_hcd:
 128         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), retval);
 129         return retval;
 130 }
 131
 132 static int ixp4xx_ehci_remove(struct platform_device *pdev)
 133 {
 134         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 135
 136         usb_remove_hcd(hcd);
 137         iounmap(hcd->regs);
 138         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 139         usb_put_hcd(hcd);
 140
 141         return 0;
 142 }
 143
 144 MODULE_ALIAS("platform:ixp4xx-ehci");
 145
 146 static struct platform_driver ixp4xx_ehci_driver = {
 147         .probe = ixp4xx_ehci_probe,
 148         .remove = ixp4xx_ehci_remove,
 149         .driver = {
 150                 .name = "ixp4xx-ehci",
 151         },
 152 };