drivers/usb/host/xhci-plat.c

   1 /*
   2  * xhci-plat.c - xHCI host controller driver platform Bus Glue.
   3  *
   4  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
   5  * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   6  *
   7  * A lot of code borrowed from the Linux xHCI driver.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/platform_device.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17
  18 #include "xhci.h"
  19
  20 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
  21 {
  22         /*
  23          * As of now platform drivers don't provide MSI support so we ensure
  24          * here that the generic code does not try to make a pci_dev from our
  25          * dev struct in order to setup MSI
  26          */
  27         xhci->quirks |= XHCI_BROKEN_MSI;
  28 }
  29
  30 /* called during probe() after chip reset completes */
  31 static int xhci_plat_setup(struct usb_hcd *hcd)
  32 {
  33         return xhci_gen_setup(hcd, xhci_plat_quirks);
  34 }
  35
  36 static const struct hc_driver xhci_plat_xhci_driver = {
  37         .description =          "xhci-hcd",
  38         .product_desc =         "xHCI Host Controller",
  39         .hcd_priv_size =        sizeof(struct xhci_hcd *),
  40
  41         /*
  42          * generic hardware linkage
  43          */
  44         .irq =                  xhci_irq,
  45         .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,
  46
  47         /*
  48          * basic lifecycle operations
  49          */
  50         .reset =                xhci_plat_setup,
  51         .start =                xhci_run,
  52         .stop =                 xhci_stop,
  53         .shutdown =             xhci_shutdown,
  54
  55         /*
  56          * managing i/o requests and associated device resources
  57          */
  58         .urb_enqueue =          xhci_urb_enqueue,
  59         .urb_dequeue =          xhci_urb_dequeue,
  60         .alloc_dev =            xhci_alloc_dev,
  61         .free_dev =             xhci_free_dev,
  62         .alloc_streams =        xhci_alloc_streams,
  63         .free_streams =         xhci_free_streams,
  64         .add_endpoint =         xhci_add_endpoint,
  65         .drop_endpoint =        xhci_drop_endpoint,
  66         .endpoint_reset =       xhci_endpoint_reset,
  67         .check_bandwidth =      xhci_check_bandwidth,
  68         .reset_bandwidth =      xhci_reset_bandwidth,
  69         .address_device =       xhci_address_device,
  70         .update_hub_device =    xhci_update_hub_device,
  71         .reset_device =         xhci_discover_or_reset_device,
  72
  73         /*
  74          * scheduling support
  75          */
  76         .get_frame_number =     xhci_get_frame,
  77
  78         /* Root hub support */
  79         .hub_control =          xhci_hub_control,
  80         .hub_status_data =      xhci_hub_status_data,
  81         .bus_suspend =          xhci_bus_suspend,
  82         .bus_resume =           xhci_bus_resume,
  83 };
  84
  85 static int xhci_plat_probe(struct platform_device *pdev)
  86 {
  87         const struct hc_driver  *driver;
  88         struct xhci_hcd         *xhci;
  89         struct resource         *res;
  90         struct usb_hcd          *hcd;
  91         int                     ret;
  92         int                     irq;
  93
  94         if (usb_disabled())
  95                 return -ENODEV;
  96
  97         driver = &xhci_plat_xhci_driver;
  98
  99         irq = platform_get_irq(pdev, 0);
 100         if (irq < 0)
 101                 return -ENODEV;
 102
 103         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 104         if (!res)
 105                 return -ENODEV;
 106
 107         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 108         if (!hcd)
 109                 return -ENOMEM;
 110
 111         hcd->rsrc_start = res->start;
 112         hcd->rsrc_len = resource_size(res);
 113
 114         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 115                                 driver->description)) {
 116                 dev_dbg(&pdev->dev, "controller already in use\n");
 117                 ret = -EBUSY;
 118                 goto put_hcd;
 119         }
 120
 121         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 122         if (!hcd->regs) {
 123                 dev_dbg(&pdev->dev, "error mapping memory\n");
 124                 ret = -EFAULT;
 125                 goto release_mem_region;
 126         }
 127
 128         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 129         if (ret)
 130                 goto unmap_registers;
 131
 132         /* USB 2.0 roothub is stored in the platform_device now. */
 133         hcd = dev_get_drvdata(&pdev->dev);
 134         xhci = hcd_to_xhci(hcd);
 135         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
 136                         dev_name(&pdev->dev), hcd);
 137         if (!xhci->shared_hcd) {
 138                 ret = -ENOMEM;
 139                 goto dealloc_usb2_hcd;
 140         }
 141
 142         /*
 143          * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
 144          * is called by usb_add_hcd().
 145          */
 146         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 147
 148         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 149         if (ret)
 150                 goto put_usb3_hcd;
 151
 152         return 0;
 153
 154 put_usb3_hcd:
 155         usb_put_hcd(xhci->shared_hcd);
 156
 157 dealloc_usb2_hcd:
 158         usb_remove_hcd(hcd);
 159
 160 unmap_registers:
 161         iounmap(hcd->regs);
 162
 163 release_mem_region:
 164         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 165
 166 put_hcd:
 167         usb_put_hcd(hcd);
 168
 169         return ret;
 170 }
 171
 172 static int xhci_plat_remove(struct platform_device *dev)
 173 {
 174         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 175         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 176
 177         usb_remove_hcd(xhci->shared_hcd);
 178         usb_put_hcd(xhci->shared_hcd);
 179
 180         usb_remove_hcd(hcd);
 181         iounmap(hcd->regs);
 182         usb_put_hcd(hcd);
 183         kfree(xhci);
 184
 185         return 0;
 186 }
 187
 188 static struct platform_driver usb_xhci_driver = {
 189         .probe  = xhci_plat_probe,
 190         .remove = xhci_plat_remove,
 191         .driver = {
 192                 .name = "xhci-hcd",
 193         },
 194 };
 195 MODULE_ALIAS("platform:xhci-hcd");
 196
 197 int xhci_register_plat(void)
 198 {
 199         return platform_driver_register(&usb_xhci_driver);
 200 }
 201
 202 void xhci_unregister_plat(void)
 203 {
 204         platform_driver_unregister(&usb_xhci_driver);
 205 }