drivers/usb/host/uhci-platform.c

   1 /*
   2  * Generic UHCI HCD (Host Controller Driver) for Platform Devices
   3  *
   4  * Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz>
   5  *
   6  * This file is based on uhci-grlib.c
   7  * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
   8  */
   9
  10 #include <linux/of.h>
  11 #include <linux/platform_device.h>
  12
  13 static int uhci_platform_init(struct usb_hcd *hcd)
  14 {
  15         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
  16
  17         uhci->rh_numports = uhci_count_ports(hcd);
  18
  19         /* Set up pointers to to generic functions */
  20         uhci->reset_hc = uhci_generic_reset_hc;
  21         uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
  22
  23         /* No special actions need to be taken for the functions below */
  24         uhci->configure_hc = NULL;
  25         uhci->resume_detect_interrupts_are_broken = NULL;
  26         uhci->global_suspend_mode_is_broken = NULL;
  27
  28         /* Reset if the controller isn't already safely quiescent. */
  29         check_and_reset_hc(uhci);
  30         return 0;
  31 }
  32
  33 static const struct hc_driver uhci_platform_hc_driver = {
  34         .description =          hcd_name,
  35         .product_desc =         "Generic UHCI Host Controller",
  36         .hcd_priv_size =        sizeof(struct uhci_hcd),
  37
  38         /* Generic hardware linkage */
  39         .irq =                  uhci_irq,
  40         .flags =                HCD_MEMORY | HCD_USB11,
  41
  42         /* Basic lifecycle operations */
  43         .reset =                uhci_platform_init,
  44         .start =                uhci_start,
  45 #ifdef CONFIG_PM
  46         .pci_suspend =          NULL,
  47         .pci_resume =           NULL,
  48         .bus_suspend =          uhci_rh_suspend,
  49         .bus_resume =           uhci_rh_resume,
  50 #endif
  51         .stop =                 uhci_stop,
  52
  53         .urb_enqueue =          uhci_urb_enqueue,
  54         .urb_dequeue =          uhci_urb_dequeue,
  55
  56         .endpoint_disable =     uhci_hcd_endpoint_disable,
  57         .get_frame_number =     uhci_hcd_get_frame_number,
  58
  59         .hub_status_data =      uhci_hub_status_data,
  60         .hub_control =          uhci_hub_control,
  61 };
  62
  63 static int uhci_hcd_platform_probe(struct platform_device *pdev)
  64 {
  65         struct usb_hcd *hcd;
  66         struct uhci_hcd *uhci;
  67         struct resource *res;
  68         int ret;
  69
  70         if (usb_disabled())
  71                 return -ENODEV;
  72
  73         /*
  74          * Right now device-tree probed devices don't get dma_mask set.
  75          * Since shared usb code relies on it, set it here for now.
  76          * Once we have dma capability bindings this can go away.
  77          */
  78         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
  79         if (ret)
  80                 return ret;
  81
  82         hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
  83                         pdev->name);
  84         if (!hcd)
  85                 return -ENOMEM;
  86
  87         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  88         hcd->rsrc_start = res->start;
  89         hcd->rsrc_len = resource_size(res);
  90
  91         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  92                 pr_err("%s: request_mem_region failed\n", __func__);
  93                 ret = -EBUSY;
  94                 goto err_rmr;
  95         }
  96
  97         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  98         if (!hcd->regs) {
  99                 pr_err("%s: ioremap failed\n", __func__);
 100                 ret = -ENOMEM;
 101                 goto err_irq;
 102         }
 103         uhci = hcd_to_uhci(hcd);
 104
 105         uhci->regs = hcd->regs;
 106
 107         ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
 108         if (ret)
 109                 goto err_uhci;
 110
 111         device_wakeup_enable(hcd->self.controller);
 112         return 0;
 113
 114 err_uhci:
 115         iounmap(hcd->regs);
 116 err_irq:
 117         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 118 err_rmr:
 119         usb_put_hcd(hcd);
 120
 121         return ret;
 122 }
 123
 124 static int uhci_hcd_platform_remove(struct platform_device *pdev)
 125 {
 126         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 127
 128         usb_remove_hcd(hcd);
 129         iounmap(hcd->regs);
 130         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 131         usb_put_hcd(hcd);
 132
 133         return 0;
 134 }
 135
 136 /* Make sure the controller is quiescent and that we're not using it
 137  * any more.  This is mainly for the benefit of programs which, like kexec,
 138  * expect the hardware to be idle: not doing DMA or generating IRQs.
 139  *
 140  * This routine may be called in a damaged or failing kernel.  Hence we
 141  * do not acquire the spinlock before shutting down the controller.
 142  */
 143 static void uhci_hcd_platform_shutdown(struct platform_device *op)
 144 {
 145         struct usb_hcd *hcd = platform_get_drvdata(op);
 146
 147         uhci_hc_died(hcd_to_uhci(hcd));
 148 }
 149
 150 static const struct of_device_id platform_uhci_ids[] = {
 151         { .compatible = "platform-uhci", },
 152         {}
 153 };
 154
 155 static struct platform_driver uhci_platform_driver = {
 156         .probe          = uhci_hcd_platform_probe,
 157         .remove         = uhci_hcd_platform_remove,
 158         .shutdown       = uhci_hcd_platform_shutdown,
 159         .driver = {
 160                 .name = "platform-uhci",
 161                 .owner = THIS_MODULE,
 162                 .of_match_table = platform_uhci_ids,
 163         },
 164 };