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/clk.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20
  21 #include "xhci.h"
  22 #include "xhci-mvebu.h"
  23
  24 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
  25 {
  26         /*
  27          * As of now platform drivers don't provide MSI support so we ensure
  28          * here that the generic code does not try to make a pci_dev from our
  29          * dev struct in order to setup MSI
  30          */
  31         xhci->quirks |= XHCI_PLAT;
  32 }
  33
  34 /* called during probe() after chip reset completes */
  35 static int xhci_plat_setup(struct usb_hcd *hcd)
  36 {
  37         return xhci_gen_setup(hcd, xhci_plat_quirks);
  38 }
  39
  40 static int xhci_plat_start(struct usb_hcd *hcd)
  41 {
  42         return xhci_run(hcd);
  43 }
  44
  45 static const struct hc_driver xhci_plat_xhci_driver = {
  46         .description =          "xhci-hcd",
  47         .product_desc =         "xHCI Host Controller",
  48         .hcd_priv_size =        sizeof(struct xhci_hcd *),
  49
  50         /*
  51          * generic hardware linkage
  52          */
  53         .irq =                  xhci_irq,
  54         .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,
  55
  56         /*
  57          * basic lifecycle operations
  58          */
  59         .reset =                xhci_plat_setup,
  60         .start =                xhci_plat_start,
  61         .stop =                 xhci_stop,
  62         .shutdown =             xhci_shutdown,
  63
  64         /*
  65          * managing i/o requests and associated device resources
  66          */
  67         .urb_enqueue =          xhci_urb_enqueue,
  68         .urb_dequeue =          xhci_urb_dequeue,
  69         .alloc_dev =            xhci_alloc_dev,
  70         .free_dev =             xhci_free_dev,
  71         .alloc_streams =        xhci_alloc_streams,
  72         .free_streams =         xhci_free_streams,
  73         .add_endpoint =         xhci_add_endpoint,
  74         .drop_endpoint =        xhci_drop_endpoint,
  75         .endpoint_reset =       xhci_endpoint_reset,
  76         .check_bandwidth =      xhci_check_bandwidth,
  77         .reset_bandwidth =      xhci_reset_bandwidth,
  78         .address_device =       xhci_address_device,
  79         .enable_device =        xhci_enable_device,
  80         .update_hub_device =    xhci_update_hub_device,
  81         .reset_device =         xhci_discover_or_reset_device,
  82
  83         /*
  84          * scheduling support
  85          */
  86         .get_frame_number =     xhci_get_frame,
  87
  88         /* Root hub support */
  89         .hub_control =          xhci_hub_control,
  90         .hub_status_data =      xhci_hub_status_data,
  91         .bus_suspend =          xhci_bus_suspend,
  92         .bus_resume =           xhci_bus_resume,
  93 };
  94
  95 static int xhci_plat_probe(struct platform_device *pdev)
  96 {
  97         const struct hc_driver  *driver;
  98         struct xhci_hcd         *xhci;
  99         struct resource         *res;
 100         struct usb_hcd          *hcd;
 101         struct clk              *clk;
 102         int                     ret;
 103         int                     irq;
 104
 105         if (usb_disabled())
 106                 return -ENODEV;
 107
 108         driver = &xhci_plat_xhci_driver;
 109
 110         irq = platform_get_irq(pdev, 0);
 111         if (irq < 0)
 112                 return -ENODEV;
 113
 114         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 115         if (!res)
 116                 return -ENODEV;
 117
 118         if (of_device_is_compatible(pdev->dev.of_node,
 119                                     "marvell,armada-375-xhci") ||
 120             of_device_is_compatible(pdev->dev.of_node,
 121                                     "marvell,armada-380-xhci")) {
 122                 ret = xhci_mvebu_mbus_init_quirk(pdev);
 123                 if (ret)
 124                         return ret;
 125         }
 126
 127         /* Initialize dma_mask and coherent_dma_mask to 32-bits */
 128         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 129         if (ret)
 130                 return ret;
 131         if (!pdev->dev.dma_mask)
 132                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 133         else
 134                 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 135
 136         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 137         if (!hcd)
 138                 return -ENOMEM;
 139
 140         hcd->rsrc_start = res->start;
 141         hcd->rsrc_len = resource_size(res);
 142
 143         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 144                                 driver->description)) {
 145                 dev_dbg(&pdev->dev, "controller already in use\n");
 146                 ret = -EBUSY;
 147                 goto put_hcd;
 148         }
 149
 150         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 151         if (!hcd->regs) {
 152                 dev_dbg(&pdev->dev, "error mapping memory\n");
 153                 ret = -EFAULT;
 154                 goto release_mem_region;
 155         }
 156
 157         /*
 158          * Not all platforms have a clk so it is not an error if the
 159          * clock does not exists.
 160          */
 161         clk = devm_clk_get(&pdev->dev, NULL);
 162         if (!IS_ERR(clk)) {
 163                 ret = clk_prepare_enable(clk);
 164                 if (ret)
 165                         goto unmap_registers;
 166         }
 167
 168         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 169         if (ret)
 170                 goto disable_clk;
 171
 172         device_wakeup_enable(hcd->self.controller);
 173
 174         /* USB 2.0 roothub is stored in the platform_device now. */
 175         hcd = platform_get_drvdata(pdev);
 176         xhci = hcd_to_xhci(hcd);
 177         xhci->clk = clk;
 178         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
 179                         dev_name(&pdev->dev), hcd);
 180         if (!xhci->shared_hcd) {
 181                 ret = -ENOMEM;
 182                 goto dealloc_usb2_hcd;
 183         }
 184
 185         /*
 186          * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
 187          * is called by usb_add_hcd().
 188          */
 189         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 190
 191         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 192         if (ret)
 193                 goto put_usb3_hcd;
 194
 195         return 0;
 196
 197 put_usb3_hcd:
 198         usb_put_hcd(xhci->shared_hcd);
 199
 200 dealloc_usb2_hcd:
 201         usb_remove_hcd(hcd);
 202
 203 disable_clk:
 204         if (!IS_ERR(clk))
 205                 clk_disable_unprepare(clk);
 206
 207 unmap_registers:
 208         iounmap(hcd->regs);
 209
 210 release_mem_region:
 211         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 212
 213 put_hcd:
 214         usb_put_hcd(hcd);
 215
 216         return ret;
 217 }
 218
 219 static int xhci_plat_remove(struct platform_device *dev)
 220 {
 221         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 222         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 223         struct clk *clk = xhci->clk;
 224
 225         usb_remove_hcd(xhci->shared_hcd);
 226         usb_put_hcd(xhci->shared_hcd);
 227
 228         usb_remove_hcd(hcd);
 229         if (!IS_ERR(clk))
 230                 clk_disable_unprepare(clk);
 231         iounmap(hcd->regs);
 232         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 233         usb_put_hcd(hcd);
 234         kfree(xhci);
 235
 236         return 0;
 237 }
 238
 239 #ifdef CONFIG_PM_SLEEP
 240 static int xhci_plat_suspend(struct device *dev)
 241 {
 242         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 243         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 244
 245         return xhci_suspend(xhci);
 246 }
 247
 248 static int xhci_plat_resume(struct device *dev)
 249 {
 250         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 251         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 252
 253         return xhci_resume(xhci, 0);
 254 }
 255
 256 static const struct dev_pm_ops xhci_plat_pm_ops = {
 257         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
 258 };
 259 #define DEV_PM_OPS      (&xhci_plat_pm_ops)
 260 #else
 261 #define DEV_PM_OPS      NULL
 262 #endif /* CONFIG_PM */
 263
 264 #ifdef CONFIG_OF
 265 static const struct of_device_id usb_xhci_of_match[] = {
 266         { .compatible = "generic-xhci" },
 267         { .compatible = "xhci-platform" },
 268         { .compatible = "marvell,armada-375-xhci"},
 269         { .compatible = "marvell,armada-380-xhci"},
 270         { },
 271 };
 272 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 273 #endif
 274
 275 static struct platform_driver usb_xhci_driver = {
 276         .probe  = xhci_plat_probe,
 277         .remove = xhci_plat_remove,
 278         .driver = {
 279                 .name = "xhci-hcd",
 280                 .pm = DEV_PM_OPS,
 281                 .of_match_table = of_match_ptr(usb_xhci_of_match),
 282         },
 283 };
 284 MODULE_ALIAS("platform:xhci-hcd");
 285
 286 int xhci_register_plat(void)
 287 {
 288         return platform_driver_register(&usb_xhci_driver);
 289 }
 290
 291 void xhci_unregister_plat(void)
 292 {
 293         platform_driver_unregister(&usb_xhci_driver);
 294 }