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         if (!pdev->dev.dma_mask)
  79                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
  80         if (!pdev->dev.coherent_dma_mask)
  81                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
  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->rsrc_start = res->start;
  90         hcd->rsrc_len = resource_size(res);
  91
  92         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  93                 pr_err("%s: request_mem_region failed\n", __func__);
  94                 ret = -EBUSY;
  95                 goto err_rmr;
  96         }
  97
  98         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  99         if (!hcd->regs) {
 100                 pr_err("%s: ioremap failed\n", __func__);
 101                 ret = -ENOMEM;
 102                 goto err_irq;
 103         }
 104         uhci = hcd_to_uhci(hcd);
 105
 106         uhci->regs = hcd->regs;
 107
 108         ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED |
 109                                                                 IRQF_SHARED);
 110         if (ret)
 111                 goto err_uhci;
 112
 113         return 0;
 114
 115 err_uhci:
 116         iounmap(hcd->regs);
 117 err_irq:
 118         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 119 err_rmr:
 120         usb_put_hcd(hcd);
 121
 122         return ret;
 123 }
 124
 125 static int uhci_hcd_platform_remove(struct platform_device *pdev)
 126 {
 127         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 128
 129         usb_remove_hcd(hcd);
 130         iounmap(hcd->regs);
 131         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 132         usb_put_hcd(hcd);
 133
 134         return 0;
 135 }
 136
 137 /* Make sure the controller is quiescent and that we're not using it
 138  * any more.  This is mainly for the benefit of programs which, like kexec,
 139  * expect the hardware to be idle: not doing DMA or generating IRQs.
 140  *
 141  * This routine may be called in a damaged or failing kernel.  Hence we
 142  * do not acquire the spinlock before shutting down the controller.
 143  */
 144 static void uhci_hcd_platform_shutdown(struct platform_device *op)
 145 {
 146         struct usb_hcd *hcd = platform_get_drvdata(op);
 147
 148         uhci_hc_died(hcd_to_uhci(hcd));
 149 }
 150
 151 static const struct of_device_id platform_uhci_ids[] = {
 152         { .compatible = "platform-uhci", },
 153         {}
 154 };
 155
 156 static struct platform_driver uhci_platform_driver = {
 157         .probe          = uhci_hcd_platform_probe,
 158         .remove         = uhci_hcd_platform_remove,
 159         .shutdown       = uhci_hcd_platform_shutdown,
 160         .driver = {
 161                 .name = "platform-uhci",
 162                 .owner = THIS_MODULE,
 163                 .of_match_table = platform_uhci_ids,
 164         },
 165 };