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         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
  81         if (ret)
  82                 return ret;
  83
  84         hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
  85                         pdev->name);
  86         if (!hcd)
  87                 return -ENOMEM;
  88
  89         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  90         hcd->rsrc_start = res->start;
  91         hcd->rsrc_len = resource_size(res);
  92
  93         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  94                 pr_err("%s: request_mem_region failed\n", __func__);
  95                 ret = -EBUSY;
  96                 goto err_rmr;
  97         }
  98
  99         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 100         if (!hcd->regs) {
 101                 pr_err("%s: ioremap failed\n", __func__);
 102                 ret = -ENOMEM;
 103                 goto err_irq;
 104         }
 105         uhci = hcd_to_uhci(hcd);
 106
 107         uhci->regs = hcd->regs;
 108
 109         ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED |
 110                                                                 IRQF_SHARED);
 111         if (ret)
 112                 goto err_uhci;
 113
 114         return 0;
 115
 116 err_uhci:
 117         iounmap(hcd->regs);
 118 err_irq:
 119         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 120 err_rmr:
 121         usb_put_hcd(hcd);
 122
 123         return ret;
 124 }
 125
 126 static int uhci_hcd_platform_remove(struct platform_device *pdev)
 127 {
 128         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 129
 130         usb_remove_hcd(hcd);
 131         iounmap(hcd->regs);
 132         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 133         usb_put_hcd(hcd);
 134
 135         return 0;
 136 }
 137
 138 /* Make sure the controller is quiescent and that we're not using it
 139  * any more.  This is mainly for the benefit of programs which, like kexec,
 140  * expect the hardware to be idle: not doing DMA or generating IRQs.
 141  *
 142  * This routine may be called in a damaged or failing kernel.  Hence we
 143  * do not acquire the spinlock before shutting down the controller.
 144  */
 145 static void uhci_hcd_platform_shutdown(struct platform_device *op)
 146 {
 147         struct usb_hcd *hcd = platform_get_drvdata(op);
 148
 149         uhci_hc_died(hcd_to_uhci(hcd));
 150 }
 151
 152 static const struct of_device_id platform_uhci_ids[] = {
 153         { .compatible = "platform-uhci", },
 154         {}
 155 };
 156
 157 static struct platform_driver uhci_platform_driver = {
 158         .probe          = uhci_hcd_platform_probe,
 159         .remove         = uhci_hcd_platform_remove,
 160         .shutdown       = uhci_hcd_platform_shutdown,
 161         .driver = {
 162                 .name = "platform-uhci",
 163                 .owner = THIS_MODULE,
 164                 .of_match_table = platform_uhci_ids,
 165         },
 166 };