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         ehci->regs = hcd->regs + 0x100
  26                 + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  27         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  28
  29         hcd->has_tt = 1;
  30         ehci_reset(ehci);
  31
  32         retval = ehci_init(hcd);
  33         if (retval)
  34                 return retval;
  35
  36         ehci_port_power(ehci, 0);
  37
  38         return retval;
  39 }
  40
  41 static const struct hc_driver ixp4xx_ehci_hc_driver = {
  42         .description            = hcd_name,
  43         .product_desc           = "IXP4XX EHCI Host Controller",
  44         .hcd_priv_size          = sizeof(struct ehci_hcd),
  45         .irq                    = ehci_irq,
  46         .flags                  = HCD_MEMORY | HCD_USB2,
  47         .reset                  = ixp4xx_ehci_init,
  48         .start                  = ehci_run,
  49         .stop                   = ehci_stop,
  50         .shutdown               = ehci_shutdown,
  51         .urb_enqueue            = ehci_urb_enqueue,
  52         .urb_dequeue            = ehci_urb_dequeue,
  53         .endpoint_disable       = ehci_endpoint_disable,
  54         .endpoint_reset         = ehci_endpoint_reset,
  55         .get_frame_number       = ehci_get_frame,
  56         .hub_status_data        = ehci_hub_status_data,
  57         .hub_control            = ehci_hub_control,
  58 #if defined(CONFIG_PM)
  59         .bus_suspend            = ehci_bus_suspend,
  60         .bus_resume             = ehci_bus_resume,
  61 #endif
  62         .relinquish_port        = ehci_relinquish_port,
  63         .port_handed_over       = ehci_port_handed_over,
  64
  65         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  66 };
  67
  68 static int ixp4xx_ehci_probe(struct platform_device *pdev)
  69 {
  70         struct usb_hcd *hcd;
  71         const struct hc_driver *driver = &ixp4xx_ehci_hc_driver;
  72         struct resource *res;
  73         int irq;
  74         int retval;
  75
  76         if (usb_disabled())
  77                 return -ENODEV;
  78
  79         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  80         if (!res) {
  81                 dev_err(&pdev->dev,
  82                         "Found HC with no IRQ. Check %s setup!\n",
  83                         dev_name(&pdev->dev));
  84                 return -ENODEV;
  85         }
  86         irq = res->start;
  87
  88         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  89         if (!hcd) {
  90                 retval = -ENOMEM;
  91                 goto fail_create_hcd;
  92         }
  93
  94         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  95         if (!res) {
  96                 dev_err(&pdev->dev,
  97                         "Found HC with no register addr. Check %s setup!\n",
  98                         dev_name(&pdev->dev));
  99                 retval = -ENODEV;
 100                 goto fail_request_resource;
 101         }
 102         hcd->rsrc_start = res->start;
 103         hcd->rsrc_len = res->end - res->start + 1;
 104
 105         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 106                                 driver->description)) {
 107                 dev_dbg(&pdev->dev, "controller already in use\n");
 108                 retval = -EBUSY;
 109                 goto fail_request_resource;
 110         }
 111
 112         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 113         if (hcd->regs == NULL) {
 114                 dev_dbg(&pdev->dev, "error mapping memory\n");
 115                 retval = -EFAULT;
 116                 goto fail_ioremap;
 117         }
 118
 119         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 120         if (retval)
 121                 goto fail_add_hcd;
 122
 123         return retval;
 124
 125 fail_add_hcd:
 126         iounmap(hcd->regs);
 127 fail_ioremap:
 128         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 129 fail_request_resource:
 130         usb_put_hcd(hcd);
 131 fail_create_hcd:
 132         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), retval);
 133         return retval;
 134 }
 135
 136 static int ixp4xx_ehci_remove(struct platform_device *pdev)
 137 {
 138         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 139
 140         usb_remove_hcd(hcd);
 141         iounmap(hcd->regs);
 142         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 143         usb_put_hcd(hcd);
 144
 145         return 0;
 146 }
 147
 148 MODULE_ALIAS("platform:ixp4xx-ehci");
 149
 150 static struct platform_driver ixp4xx_ehci_driver = {
 151         .probe = ixp4xx_ehci_probe,
 152         .remove = ixp4xx_ehci_remove,
 153         .driver = {
 154                 .name = "ixp4xx-ehci",
 155         },
 156 };