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 #include <linux/of.h>
  18 #include <linux/dma-mapping.h>
  19
  20 #include "xhci.h"
  21
  22 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
  23 {
  24         /*
  25          * As of now platform drivers don't provide MSI support so we ensure
  26          * here that the generic code does not try to make a pci_dev from our
  27          * dev struct in order to setup MSI
  28          */
  29         xhci->quirks |= XHCI_PLAT;
  30 }
  31
  32 /* called during probe() after chip reset completes */
  33 static int xhci_plat_setup(struct usb_hcd *hcd)
  34 {
  35         return xhci_gen_setup(hcd, xhci_plat_quirks);
  36 }
  37
  38 static const struct hc_driver xhci_plat_xhci_driver = {
  39         .description =          "xhci-hcd",
  40         .product_desc =         "xHCI Host Controller",
  41         .hcd_priv_size =        sizeof(struct xhci_hcd *),
  42
  43         /*
  44          * generic hardware linkage
  45          */
  46         .irq =                  xhci_irq,
  47         .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,
  48
  49         /*
  50          * basic lifecycle operations
  51          */
  52         .reset =                xhci_plat_setup,
  53         .start =                xhci_run,
  54         .stop =                 xhci_stop,
  55         .shutdown =             xhci_shutdown,
  56
  57         /*
  58          * managing i/o requests and associated device resources
  59          */
  60         .urb_enqueue =          xhci_urb_enqueue,
  61         .urb_dequeue =          xhci_urb_dequeue,
  62         .alloc_dev =            xhci_alloc_dev,
  63         .free_dev =             xhci_free_dev,
  64         .alloc_streams =        xhci_alloc_streams,
  65         .free_streams =         xhci_free_streams,
  66         .add_endpoint =         xhci_add_endpoint,
  67         .drop_endpoint =        xhci_drop_endpoint,
  68         .endpoint_reset =       xhci_endpoint_reset,
  69         .check_bandwidth =      xhci_check_bandwidth,
  70         .reset_bandwidth =      xhci_reset_bandwidth,
  71         .address_device =       xhci_address_device,
  72         .enable_device =        xhci_enable_device,
  73         .update_hub_device =    xhci_update_hub_device,
  74         .reset_device =         xhci_discover_or_reset_device,
  75
  76         /*
  77          * scheduling support
  78          */
  79         .get_frame_number =     xhci_get_frame,
  80
  81         /* Root hub support */
  82         .hub_control =          xhci_hub_control,
  83         .hub_status_data =      xhci_hub_status_data,
  84         .bus_suspend =          xhci_bus_suspend,
  85         .bus_resume =           xhci_bus_resume,
  86 };
  87
  88 static int xhci_plat_probe(struct platform_device *pdev)
  89 {
  90         const struct hc_driver  *driver;
  91         struct xhci_hcd         *xhci;
  92         struct resource         *res;
  93         struct usb_hcd          *hcd;
  94         int                     ret;
  95         int                     irq;
  96
  97         if (usb_disabled())
  98                 return -ENODEV;
  99
 100         driver = &xhci_plat_xhci_driver;
 101
 102         irq = platform_get_irq(pdev, 0);
 103         if (irq < 0)
 104                 return -ENODEV;
 105
 106         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 107         if (!res)
 108                 return -ENODEV;
 109
 110         /* Initialize dma_mask and coherent_dma_mask to 32-bits */
 111         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 112         if (ret)
 113                 return ret;
 114         if (!pdev->dev.dma_mask)
 115                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 116         else
 117                 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 118
 119         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 120         if (!hcd)
 121                 return -ENOMEM;
 122
 123         hcd->rsrc_start = res->start;
 124         hcd->rsrc_len = resource_size(res);
 125
 126         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 127                                 driver->description)) {
 128                 dev_dbg(&pdev->dev, "controller already in use\n");
 129                 ret = -EBUSY;
 130                 goto put_hcd;
 131         }
 132
 133         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 134         if (!hcd->regs) {
 135                 dev_dbg(&pdev->dev, "error mapping memory\n");
 136                 ret = -EFAULT;
 137                 goto release_mem_region;
 138         }
 139
 140         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 141         if (ret)
 142                 goto unmap_registers;
 143         device_wakeup_enable(hcd->self.controller);
 144
 145         /* USB 2.0 roothub is stored in the platform_device now. */
 146         hcd = platform_get_drvdata(pdev);
 147         xhci = hcd_to_xhci(hcd);
 148         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
 149                         dev_name(&pdev->dev), hcd);
 150         if (!xhci->shared_hcd) {
 151                 ret = -ENOMEM;
 152                 goto dealloc_usb2_hcd;
 153         }
 154
 155         /*
 156          * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
 157          * is called by usb_add_hcd().
 158          */
 159         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 160
 161         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 162         if (ret)
 163                 goto put_usb3_hcd;
 164
 165         return 0;
 166
 167 put_usb3_hcd:
 168         usb_put_hcd(xhci->shared_hcd);
 169
 170 dealloc_usb2_hcd:
 171         usb_remove_hcd(hcd);
 172
 173 unmap_registers:
 174         iounmap(hcd->regs);
 175
 176 release_mem_region:
 177         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 178
 179 put_hcd:
 180         usb_put_hcd(hcd);
 181
 182         return ret;
 183 }
 184
 185 static int xhci_plat_remove(struct platform_device *dev)
 186 {
 187         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 188         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 189
 190         usb_remove_hcd(xhci->shared_hcd);
 191         usb_put_hcd(xhci->shared_hcd);
 192
 193         usb_remove_hcd(hcd);
 194         iounmap(hcd->regs);
 195         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 196         usb_put_hcd(hcd);
 197         kfree(xhci);
 198
 199         return 0;
 200 }
 201
 202 #ifdef CONFIG_PM
 203 static int xhci_plat_suspend(struct device *dev)
 204 {
 205         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 206         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 207
 208         return xhci_suspend(xhci);
 209 }
 210
 211 static int xhci_plat_resume(struct device *dev)
 212 {
 213         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 214         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 215
 216         return xhci_resume(xhci, 0);
 217 }
 218
 219 static const struct dev_pm_ops xhci_plat_pm_ops = {
 220         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
 221 };
 222 #define DEV_PM_OPS      (&xhci_plat_pm_ops)
 223 #else
 224 #define DEV_PM_OPS      NULL
 225 #endif /* CONFIG_PM */
 226
 227 #ifdef CONFIG_OF
 228 static const struct of_device_id usb_xhci_of_match[] = {
 229         { .compatible = "xhci-platform" },
 230         { },
 231 };
 232 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 233 #endif
 234
 235 static struct platform_driver usb_xhci_driver = {
 236         .probe  = xhci_plat_probe,
 237         .remove = xhci_plat_remove,
 238         .driver = {
 239                 .name = "xhci-hcd",
 240                 .pm = DEV_PM_OPS,
 241                 .of_match_table = of_match_ptr(usb_xhci_of_match),
 242         },
 243 };
 244 MODULE_ALIAS("platform:xhci-hcd");
 245
 246 int xhci_register_plat(void)
 247 {
 248         return platform_driver_register(&usb_xhci_driver);
 249 }
 250
 251 void xhci_unregister_plat(void)
 252 {
 253         platform_driver_unregister(&usb_xhci_driver);
 254 }