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 #include <linux/usb/xhci_pdriver.h>
  21
  22 #include "xhci.h"
  23 #include "xhci-mvebu.h"
  24 #include "xhci-rcar.h"
  25
  26 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
  27 {
  28         /*
  29          * As of now platform drivers don't provide MSI support so we ensure
  30          * here that the generic code does not try to make a pci_dev from our
  31          * dev struct in order to setup MSI
  32          */
  33         xhci->quirks |= XHCI_PLAT;
  34 }
  35
  36 /* called during probe() after chip reset completes */
  37 static int xhci_plat_setup(struct usb_hcd *hcd)
  38 {
  39         struct device_node *of_node = hcd->self.controller->of_node;
  40         int ret;
  41
  42         if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
  43             of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) {
  44                 ret = xhci_rcar_init_quirk(hcd);
  45                 if (ret)
  46                         return ret;
  47         }
  48
  49         return xhci_gen_setup(hcd, xhci_plat_quirks);
  50 }
  51
  52 static int xhci_plat_start(struct usb_hcd *hcd)
  53 {
  54         struct device_node *of_node = hcd->self.controller->of_node;
  55
  56         if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
  57             of_device_is_compatible(of_node, "renesas,xhci-r8a7791"))
  58                 xhci_rcar_start(hcd);
  59
  60         return xhci_run(hcd);
  61 }
  62
  63 static const struct hc_driver xhci_plat_xhci_driver = {
  64         .description =          "xhci-hcd",
  65         .product_desc =         "xHCI Host Controller",
  66         .hcd_priv_size =        sizeof(struct xhci_hcd *),
  67
  68         /*
  69          * generic hardware linkage
  70          */
  71         .irq =                  xhci_irq,
  72         .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,
  73
  74         /*
  75          * basic lifecycle operations
  76          */
  77         .reset =                xhci_plat_setup,
  78         .start =                xhci_plat_start,
  79         .stop =                 xhci_stop,
  80         .shutdown =             xhci_shutdown,
  81
  82         /*
  83          * managing i/o requests and associated device resources
  84          */
  85         .urb_enqueue =          xhci_urb_enqueue,
  86         .urb_dequeue =          xhci_urb_dequeue,
  87         .alloc_dev =            xhci_alloc_dev,
  88         .free_dev =             xhci_free_dev,
  89         .alloc_streams =        xhci_alloc_streams,
  90         .free_streams =         xhci_free_streams,
  91         .add_endpoint =         xhci_add_endpoint,
  92         .drop_endpoint =        xhci_drop_endpoint,
  93         .endpoint_reset =       xhci_endpoint_reset,
  94         .check_bandwidth =      xhci_check_bandwidth,
  95         .reset_bandwidth =      xhci_reset_bandwidth,
  96         .address_device =       xhci_address_device,
  97         .enable_device =        xhci_enable_device,
  98         .update_hub_device =    xhci_update_hub_device,
  99         .reset_device =         xhci_discover_or_reset_device,
 100
 101         /*
 102          * scheduling support
 103          */
 104         .get_frame_number =     xhci_get_frame,
 105
 106         /* Root hub support */
 107         .hub_control =          xhci_hub_control,
 108         .hub_status_data =      xhci_hub_status_data,
 109         .bus_suspend =          xhci_bus_suspend,
 110         .bus_resume =           xhci_bus_resume,
 111
 112         .enable_usb3_lpm_timeout =      xhci_enable_usb3_lpm_timeout,
 113         .disable_usb3_lpm_timeout =     xhci_disable_usb3_lpm_timeout,
 114 };
 115
 116 static int xhci_plat_probe(struct platform_device *pdev)
 117 {
 118         struct device_node      *node = pdev->dev.of_node;
 119         struct usb_xhci_pdata   *pdata = dev_get_platdata(&pdev->dev);
 120         const struct hc_driver  *driver;
 121         struct xhci_hcd         *xhci;
 122         struct resource         *res;
 123         struct usb_hcd          *hcd;
 124         struct clk              *clk;
 125         int                     ret;
 126         int                     irq;
 127
 128         if (usb_disabled())
 129                 return -ENODEV;
 130
 131         driver = &xhci_plat_xhci_driver;
 132
 133         irq = platform_get_irq(pdev, 0);
 134         if (irq < 0)
 135                 return -ENODEV;
 136
 137         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 138         if (!res)
 139                 return -ENODEV;
 140
 141         if (of_device_is_compatible(pdev->dev.of_node,
 142                                     "marvell,armada-375-xhci") ||
 143             of_device_is_compatible(pdev->dev.of_node,
 144                                     "marvell,armada-380-xhci")) {
 145                 ret = xhci_mvebu_mbus_init_quirk(pdev);
 146                 if (ret)
 147                         return ret;
 148         }
 149
 150         /* Initialize dma_mask and coherent_dma_mask to 32-bits */
 151         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 152         if (ret)
 153                 return ret;
 154         if (!pdev->dev.dma_mask)
 155                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 156         else
 157                 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 158
 159         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 160         if (!hcd)
 161                 return -ENOMEM;
 162
 163         hcd->rsrc_start = res->start;
 164         hcd->rsrc_len = resource_size(res);
 165
 166         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 167         if (IS_ERR(hcd->regs)) {
 168                 ret = PTR_ERR(hcd->regs);
 169                 goto put_hcd;
 170         }
 171
 172         /*
 173          * Not all platforms have a clk so it is not an error if the
 174          * clock does not exists.
 175          */
 176         clk = devm_clk_get(&pdev->dev, NULL);
 177         if (!IS_ERR(clk)) {
 178                 ret = clk_prepare_enable(clk);
 179                 if (ret)
 180                         goto put_hcd;
 181         }
 182
 183         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 184         if (ret)
 185                 goto disable_clk;
 186
 187         device_wakeup_enable(hcd->self.controller);
 188
 189         /* USB 2.0 roothub is stored in the platform_device now. */
 190         hcd = platform_get_drvdata(pdev);
 191         xhci = hcd_to_xhci(hcd);
 192         xhci->clk = clk;
 193         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
 194                         dev_name(&pdev->dev), hcd);
 195         if (!xhci->shared_hcd) {
 196                 ret = -ENOMEM;
 197                 goto dealloc_usb2_hcd;
 198         }
 199
 200         if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
 201                         (pdata && pdata->usb3_lpm_capable))
 202                 xhci->quirks |= XHCI_LPM_SUPPORT;
 203         /*
 204          * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
 205          * is called by usb_add_hcd().
 206          */
 207         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 208
 209         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 210         if (ret)
 211                 goto put_usb3_hcd;
 212
 213         return 0;
 214
 215 put_usb3_hcd:
 216         usb_put_hcd(xhci->shared_hcd);
 217
 218 dealloc_usb2_hcd:
 219         usb_remove_hcd(hcd);
 220
 221 disable_clk:
 222         if (!IS_ERR(clk))
 223                 clk_disable_unprepare(clk);
 224
 225 put_hcd:
 226         usb_put_hcd(hcd);
 227
 228         return ret;
 229 }
 230
 231 static int xhci_plat_remove(struct platform_device *dev)
 232 {
 233         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 234         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 235         struct clk *clk = xhci->clk;
 236
 237         usb_remove_hcd(xhci->shared_hcd);
 238         usb_put_hcd(xhci->shared_hcd);
 239
 240         usb_remove_hcd(hcd);
 241         if (!IS_ERR(clk))
 242                 clk_disable_unprepare(clk);
 243         usb_put_hcd(hcd);
 244         kfree(xhci);
 245
 246         return 0;
 247 }
 248
 249 #ifdef CONFIG_PM_SLEEP
 250 static int xhci_plat_suspend(struct device *dev)
 251 {
 252         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 253         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 254
 255         return xhci_suspend(xhci);
 256 }
 257
 258 static int xhci_plat_resume(struct device *dev)
 259 {
 260         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 261         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 262
 263         return xhci_resume(xhci, 0);
 264 }
 265
 266 static const struct dev_pm_ops xhci_plat_pm_ops = {
 267         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
 268 };
 269 #define DEV_PM_OPS      (&xhci_plat_pm_ops)
 270 #else
 271 #define DEV_PM_OPS      NULL
 272 #endif /* CONFIG_PM */
 273
 274 #ifdef CONFIG_OF
 275 static const struct of_device_id usb_xhci_of_match[] = {
 276         { .compatible = "generic-xhci" },
 277         { .compatible = "xhci-platform" },
 278         { .compatible = "marvell,armada-375-xhci"},
 279         { .compatible = "marvell,armada-380-xhci"},
 280         { .compatible = "renesas,xhci-r8a7790"},
 281         { .compatible = "renesas,xhci-r8a7791"},
 282         { },
 283 };
 284 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 285 #endif
 286
 287 static struct platform_driver usb_xhci_driver = {
 288         .probe  = xhci_plat_probe,
 289         .remove = xhci_plat_remove,
 290         .driver = {
 291                 .name = "xhci-hcd",
 292                 .pm = DEV_PM_OPS,
 293                 .of_match_table = of_match_ptr(usb_xhci_of_match),
 294         },
 295 };
 296 MODULE_ALIAS("platform:xhci-hcd");
 297
 298 int xhci_register_plat(void)
 299 {
 300         return platform_driver_register(&usb_xhci_driver);
 301 }
 302
 303 void xhci_unregister_plat(void)
 304 {
 305         platform_driver_unregister(&usb_xhci_driver);
 306 }