drivers/usb/host/ehci-xls.c

   1 /*
   2  * EHCI HCD for Netlogic XLS processors.
   3  *
   4  * (C) Copyright 2011 Netlogic Microsystems Inc.
   5  *
   6  *  Based on various ehci-*.c drivers
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file COPYING in the main directory of this archive for
  10  * more details.
  11  */
  12
  13 #include <linux/platform_device.h>
  14
  15 static int ehci_xls_setup(struct usb_hcd *hcd)
  16 {
  17         int     retval;
  18         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  19
  20         ehci->caps = hcd->regs;
  21         ehci->regs = hcd->regs +
  22                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  23         dbg_hcs_params(ehci, "reset");
  24         dbg_hcc_params(ehci, "reset");
  25
  26         /* cache this readonly data; minimize chip reads */
  27         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  28
  29         retval = ehci_halt(ehci);
  30         if (retval)
  31                 return retval;
  32
  33         /* data structure init */
  34         retval = ehci_init(hcd);
  35         if (retval)
  36                 return retval;
  37
  38         ehci_reset(ehci);
  39
  40         return retval;
  41 }
  42
  43 int ehci_xls_probe_internal(const struct hc_driver *driver,
  44         struct platform_device *pdev)
  45 {
  46         struct usb_hcd  *hcd;
  47         struct resource *res;
  48         int retval, irq;
  49
  50         /* Get our IRQ from an earlier registered Platform Resource */
  51         irq = platform_get_irq(pdev, 0);
  52         if (irq < 0) {
  53                 dev_err(&pdev->dev, "Found HC with no IRQ. Check %s setup!\n",
  54                                 dev_name(&pdev->dev));
  55                 return -ENODEV;
  56         }
  57
  58         /* Get our Memory Handle */
  59         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  60         if (!res) {
  61                 dev_err(&pdev->dev, "Error: MMIO Handle %s setup!\n",
  62                                 dev_name(&pdev->dev));
  63                 return -ENODEV;
  64         }
  65         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  66         if (!hcd) {
  67                 retval = -ENOMEM;
  68                 goto err1;
  69         }
  70
  71         hcd->rsrc_start = res->start;
  72         hcd->rsrc_len = resource_size(res);
  73
  74         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
  75                                 driver->description)) {
  76                 dev_dbg(&pdev->dev, "controller already in use\n");
  77                 retval = -EBUSY;
  78                 goto err2;
  79         }
  80         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
  81
  82         if (hcd->regs == NULL) {
  83                 dev_dbg(&pdev->dev, "error mapping memory\n");
  84                 retval = -EFAULT;
  85                 goto err3;
  86         }
  87
  88         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
  89         if (retval != 0)
  90                 goto err4;
  91         return retval;
  92
  93 err4:
  94         iounmap(hcd->regs);
  95 err3:
  96         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  97 err2:
  98         usb_put_hcd(hcd);
  99 err1:
 100         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev),
 101                         retval);
 102         return retval;
 103 }
 104
 105 static struct hc_driver ehci_xls_hc_driver = {
 106         .description    = hcd_name,
 107         .product_desc   = "XLS EHCI Host Controller",
 108         .hcd_priv_size  = sizeof(struct ehci_hcd),
 109         .irq            = ehci_irq,
 110         .flags          = HCD_USB2 | HCD_MEMORY,
 111         .reset          = ehci_xls_setup,
 112         .start          = ehci_run,
 113         .stop           = ehci_stop,
 114         .shutdown       = ehci_shutdown,
 115
 116         .urb_enqueue    = ehci_urb_enqueue,
 117         .urb_dequeue    = ehci_urb_dequeue,
 118         .endpoint_disable = ehci_endpoint_disable,
 119         .endpoint_reset = ehci_endpoint_reset,
 120
 121         .get_frame_number = ehci_get_frame,
 122
 123         .hub_status_data = ehci_hub_status_data,
 124         .hub_control    = ehci_hub_control,
 125         .bus_suspend    = ehci_bus_suspend,
 126         .bus_resume     = ehci_bus_resume,
 127         .relinquish_port = ehci_relinquish_port,
 128         .port_handed_over = ehci_port_handed_over,
 129
 130         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 131 };
 132
 133 static int ehci_xls_probe(struct platform_device *pdev)
 134 {
 135         if (usb_disabled())
 136                 return -ENODEV;
 137
 138         return ehci_xls_probe_internal(&ehci_xls_hc_driver, pdev);
 139 }
 140
 141 static int ehci_xls_remove(struct platform_device *pdev)
 142 {
 143         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 144
 145         usb_remove_hcd(hcd);
 146         iounmap(hcd->regs);
 147         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 148         usb_put_hcd(hcd);
 149         return 0;
 150 }
 151
 152 MODULE_ALIAS("ehci-xls");
 153
 154 static struct platform_driver ehci_xls_driver = {
 155         .probe          = ehci_xls_probe,
 156         .remove         = ehci_xls_remove,
 157         .shutdown       = usb_hcd_platform_shutdown,
 158         .driver         = {
 159                 .name = "ehci-xls",
 160         },
 161 };