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