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         .update_hub_device =    xhci_update_hub_device,
  73         .reset_device =         xhci_discover_or_reset_device,
  74
  75         /*
  76          * scheduling support
  77          */
  78         .get_frame_number =     xhci_get_frame,
  79
  80         /* Root hub support */
  81         .hub_control =          xhci_hub_control,
  82         .hub_status_data =      xhci_hub_status_data,
  83         .bus_suspend =          xhci_bus_suspend,
  84         .bus_resume =           xhci_bus_resume,
  85 };
  86
  87 static int xhci_plat_probe(struct platform_device *pdev)
  88 {
  89         const struct hc_driver  *driver;
  90         struct xhci_hcd         *xhci;
  91         struct resource         *res;
  92         struct usb_hcd          *hcd;
  93         int                     ret;
  94         int                     irq;
  95
  96         if (usb_disabled())
  97                 return -ENODEV;
  98
  99         driver = &xhci_plat_xhci_driver;
 100
 101         irq = platform_get_irq(pdev, 0);
 102         if (irq < 0)
 103                 return -ENODEV;
 104
 105         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 106         if (!res)
 107                 return -ENODEV;
 108
 109         /* Initialize dma_mask and coherent_dma_mask to 32-bits */
 110         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 111         if (ret)
 112                 return ret;
 113         if (!pdev->dev.dma_mask)
 114                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 115         else
 116                 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 117
 118         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 119         if (!hcd)
 120                 return -ENOMEM;
 121
 122         hcd->rsrc_start = res->start;
 123         hcd->rsrc_len = resource_size(res);
 124
 125         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 126                                 driver->description)) {
 127                 dev_dbg(&pdev->dev, "controller already in use\n");
 128                 ret = -EBUSY;
 129                 goto put_hcd;
 130         }
 131
 132         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 133         if (!hcd->regs) {
 134                 dev_dbg(&pdev->dev, "error mapping memory\n");
 135                 ret = -EFAULT;
 136                 goto release_mem_region;
 137         }
 138
 139         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 140         if (ret)
 141                 goto unmap_registers;
 142
 143         /* USB 2.0 roothub is stored in the platform_device now. */
 144         hcd = platform_get_drvdata(pdev);
 145         xhci = hcd_to_xhci(hcd);
 146         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
 147                         dev_name(&pdev->dev), hcd);
 148         if (!xhci->shared_hcd) {
 149                 ret = -ENOMEM;
 150                 goto dealloc_usb2_hcd;
 151         }
 152
 153         /*
 154          * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
 155          * is called by usb_add_hcd().
 156          */
 157         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 158
 159         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 160         if (ret)
 161                 goto put_usb3_hcd;
 162
 163         return 0;
 164
 165 put_usb3_hcd:
 166         usb_put_hcd(xhci->shared_hcd);
 167
 168 dealloc_usb2_hcd:
 169         usb_remove_hcd(hcd);
 170
 171 unmap_registers:
 172         iounmap(hcd->regs);
 173
 174 release_mem_region:
 175         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 176
 177 put_hcd:
 178         usb_put_hcd(hcd);
 179
 180         return ret;
 181 }
 182
 183 static int xhci_plat_remove(struct platform_device *dev)
 184 {
 185         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 186         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 187
 188         usb_remove_hcd(xhci->shared_hcd);
 189         usb_put_hcd(xhci->shared_hcd);
 190
 191         usb_remove_hcd(hcd);
 192         iounmap(hcd->regs);
 193         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 194         usb_put_hcd(hcd);
 195         kfree(xhci);
 196
 197         return 0;
 198 }
 199
 200 #ifdef CONFIG_PM
 201 static int xhci_plat_suspend(struct device *dev)
 202 {
 203         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 204         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 205
 206         return xhci_suspend(xhci);
 207 }
 208
 209 static int xhci_plat_resume(struct device *dev)
 210 {
 211         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 212         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 213
 214         return xhci_resume(xhci, 0);
 215 }
 216
 217 static const struct dev_pm_ops xhci_plat_pm_ops = {
 218         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
 219 };
 220 #define DEV_PM_OPS      (&xhci_plat_pm_ops)
 221 #else
 222 #define DEV_PM_OPS      NULL
 223 #endif /* CONFIG_PM */
 224
 225 #ifdef CONFIG_OF
 226 static const struct of_device_id usb_xhci_of_match[] = {
 227         { .compatible = "xhci-platform" },
 228         { },
 229 };
 230 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 231 #endif
 232
 233 static struct platform_driver usb_xhci_driver = {
 234         .probe  = xhci_plat_probe,
 235         .remove = xhci_plat_remove,
 236         .driver = {
 237                 .name = "xhci-hcd",
 238                 .pm = DEV_PM_OPS,
 239                 .of_match_table = of_match_ptr(usb_xhci_of_match),
 240         },
 241 };
 242 MODULE_ALIAS("platform:xhci-hcd");
 243
 244 int xhci_register_plat(void)
 245 {
 246         return platform_driver_register(&usb_xhci_driver);
 247 }
 248
 249 void xhci_unregister_plat(void)
 250 {
 251         platform_driver_unregister(&usb_xhci_driver);
 252 }