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/usb/phy.h>
  20 #include <linux/slab.h>
  21 #include <linux/usb/xhci_pdriver.h>
  22 #include <linux/acpi.h>
  23
  24 #include "xhci.h"
  25 #include "xhci-mvebu.h"
  26 #include "xhci-rcar.h"
  27
  28 static struct hc_driver __read_mostly xhci_plat_hc_driver;
  29
  30 static int xhci_plat_setup(struct usb_hcd *hcd);
  31 static int xhci_plat_start(struct usb_hcd *hcd);
  32
  33 static const struct xhci_driver_overrides xhci_plat_overrides __initconst = {
  34         .extra_priv_size = sizeof(struct xhci_hcd),
  35         .reset = xhci_plat_setup,
  36         .start = xhci_plat_start,
  37 };
  38
  39 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
  40 {
  41         /*
  42          * As of now platform drivers don't provide MSI support so we ensure
  43          * here that the generic code does not try to make a pci_dev from our
  44          * dev struct in order to setup MSI
  45          */
  46         xhci->quirks |= XHCI_PLAT;
  47 }
  48
  49 /* called during probe() after chip reset completes */
  50 static int xhci_plat_setup(struct usb_hcd *hcd)
  51 {
  52         struct device_node *of_node = hcd->self.controller->of_node;
  53         int ret;
  54
  55         if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
  56             of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) {
  57                 ret = xhci_rcar_init_quirk(hcd);
  58                 if (ret)
  59                         return ret;
  60         }
  61
  62         return xhci_gen_setup(hcd, xhci_plat_quirks);
  63 }
  64
  65 static int xhci_plat_start(struct usb_hcd *hcd)
  66 {
  67         struct device_node *of_node = hcd->self.controller->of_node;
  68
  69         if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
  70             of_device_is_compatible(of_node, "renesas,xhci-r8a7791"))
  71                 xhci_rcar_start(hcd);
  72
  73         return xhci_run(hcd);
  74 }
  75
  76 static int xhci_plat_probe(struct platform_device *pdev)
  77 {
  78         struct device_node      *node = pdev->dev.of_node;
  79         struct usb_xhci_pdata   *pdata = dev_get_platdata(&pdev->dev);
  80         const struct hc_driver  *driver;
  81         struct xhci_hcd         *xhci;
  82         struct resource         *res;
  83         struct usb_hcd          *hcd;
  84         struct clk              *clk;
  85         int                     ret;
  86         int                     irq;
  87
  88         if (usb_disabled())
  89                 return -ENODEV;
  90
  91         driver = &xhci_plat_hc_driver;
  92
  93         irq = platform_get_irq(pdev, 0);
  94         if (irq < 0)
  95                 return -ENODEV;
  96
  97         /* Try to set 64-bit DMA first */
  98         if (WARN_ON(!pdev->dev.dma_mask))
  99                 /* Platform did not initialize dma_mask */
 100                 ret = dma_coerce_mask_and_coherent(&pdev->dev,
 101                                                    DMA_BIT_MASK(64));
 102         else
 103                 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 104
 105         /* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
 106         if (ret) {
 107                 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 108                 if (ret)
 109                         return ret;
 110         }
 111
 112         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 113         if (!hcd)
 114                 return -ENOMEM;
 115
 116         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 117         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 118         if (IS_ERR(hcd->regs)) {
 119                 ret = PTR_ERR(hcd->regs);
 120                 goto put_hcd;
 121         }
 122
 123         hcd->rsrc_start = res->start;
 124         hcd->rsrc_len = resource_size(res);
 125
 126         /*
 127          * Not all platforms have a clk so it is not an error if the
 128          * clock does not exists.
 129          */
 130         clk = devm_clk_get(&pdev->dev, NULL);
 131         if (!IS_ERR(clk)) {
 132                 ret = clk_prepare_enable(clk);
 133                 if (ret)
 134                         goto put_hcd;
 135         } else if (PTR_ERR(clk) == -EPROBE_DEFER) {
 136                 ret = -EPROBE_DEFER;
 137                 goto put_hcd;
 138         }
 139
 140         if (of_device_is_compatible(pdev->dev.of_node,
 141                                     "marvell,armada-375-xhci") ||
 142             of_device_is_compatible(pdev->dev.of_node,
 143                                     "marvell,armada-380-xhci")) {
 144                 ret = xhci_mvebu_mbus_init_quirk(pdev);
 145                 if (ret)
 146                         goto disable_clk;
 147         }
 148
 149         device_wakeup_enable(hcd->self.controller);
 150
 151         xhci = hcd_to_xhci(hcd);
 152         xhci->clk = clk;
 153         xhci->main_hcd = hcd;
 154         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
 155                         dev_name(&pdev->dev), hcd);
 156         if (!xhci->shared_hcd) {
 157                 ret = -ENOMEM;
 158                 goto disable_clk;
 159         }
 160
 161         if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
 162                         (pdata && pdata->usb3_lpm_capable))
 163                 xhci->quirks |= XHCI_LPM_SUPPORT;
 164
 165         if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
 166                 xhci->shared_hcd->can_do_streams = 1;
 167
 168         hcd->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
 169         if (IS_ERR(hcd->usb_phy)) {
 170                 ret = PTR_ERR(hcd->usb_phy);
 171                 if (ret == -EPROBE_DEFER)
 172                         goto put_usb3_hcd;
 173                 hcd->usb_phy = NULL;
 174         } else {
 175                 ret = usb_phy_init(hcd->usb_phy);
 176                 if (ret)
 177                         goto put_usb3_hcd;
 178         }
 179
 180         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 181         if (ret)
 182                 goto disable_usb_phy;
 183
 184         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 185         if (ret)
 186                 goto dealloc_usb2_hcd;
 187
 188         return 0;
 189
 190
 191 dealloc_usb2_hcd:
 192         usb_remove_hcd(hcd);
 193
 194 disable_usb_phy:
 195         usb_phy_shutdown(hcd->usb_phy);
 196
 197 put_usb3_hcd:
 198         usb_put_hcd(xhci->shared_hcd);
 199
 200 disable_clk:
 201         if (!IS_ERR(clk))
 202                 clk_disable_unprepare(clk);
 203
 204 put_hcd:
 205         usb_put_hcd(hcd);
 206
 207         return ret;
 208 }
 209
 210 static int xhci_plat_remove(struct platform_device *dev)
 211 {
 212         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 213         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 214         struct clk *clk = xhci->clk;
 215
 216         usb_remove_hcd(xhci->shared_hcd);
 217         usb_phy_shutdown(hcd->usb_phy);
 218
 219         usb_remove_hcd(hcd);
 220         usb_put_hcd(xhci->shared_hcd);
 221
 222         if (!IS_ERR(clk))
 223                 clk_disable_unprepare(clk);
 224         usb_put_hcd(hcd);
 225
 226         return 0;
 227 }
 228
 229 #ifdef CONFIG_PM_SLEEP
 230 static int xhci_plat_suspend(struct device *dev)
 231 {
 232         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 233         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 234
 235         /*
 236          * xhci_suspend() needs `do_wakeup` to know whether host is allowed
 237          * to do wakeup during suspend. Since xhci_plat_suspend is currently
 238          * only designed for system suspend, device_may_wakeup() is enough
 239          * to dertermine whether host is allowed to do wakeup. Need to
 240          * reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
 241          * also applies to runtime suspend.
 242          */
 243         return xhci_suspend(xhci, device_may_wakeup(dev));
 244 }
 245
 246 static int xhci_plat_resume(struct device *dev)
 247 {
 248         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 249         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 250
 251         return xhci_resume(xhci, 0);
 252 }
 253
 254 static const struct dev_pm_ops xhci_plat_pm_ops = {
 255         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
 256 };
 257 #define DEV_PM_OPS      (&xhci_plat_pm_ops)
 258 #else
 259 #define DEV_PM_OPS      NULL
 260 #endif /* CONFIG_PM */
 261
 262 #ifdef CONFIG_OF
 263 static const struct of_device_id usb_xhci_of_match[] = {
 264         { .compatible = "generic-xhci" },
 265         { .compatible = "xhci-platform" },
 266         { .compatible = "marvell,armada-375-xhci"},
 267         { .compatible = "marvell,armada-380-xhci"},
 268         { .compatible = "renesas,xhci-r8a7790"},
 269         { .compatible = "renesas,xhci-r8a7791"},
 270         { },
 271 };
 272 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 273 #endif
 274
 275 static const struct acpi_device_id usb_xhci_acpi_match[] = {
 276         /* XHCI-compliant USB Controller */
 277         { "PNP0D10", },
 278         { }
 279 };
 280 MODULE_DEVICE_TABLE(acpi, usb_xhci_acpi_match);
 281
 282 static struct platform_driver usb_xhci_driver = {
 283         .probe  = xhci_plat_probe,
 284         .remove = xhci_plat_remove,
 285         .driver = {
 286                 .name = "xhci-hcd",
 287                 .pm = DEV_PM_OPS,
 288                 .of_match_table = of_match_ptr(usb_xhci_of_match),
 289                 .acpi_match_table = ACPI_PTR(usb_xhci_acpi_match),
 290         },
 291 };
 292 MODULE_ALIAS("platform:xhci-hcd");
 293
 294 static int __init xhci_plat_init(void)
 295 {
 296         xhci_init_driver(&xhci_plat_hc_driver, &xhci_plat_overrides);
 297         return platform_driver_register(&usb_xhci_driver);
 298 }
 299 module_init(xhci_plat_init);
 300
 301 static void __exit xhci_plat_exit(void)
 302 {
 303         platform_driver_unregister(&usb_xhci_driver);
 304 }
 305 module_exit(xhci_plat_exit);
 306
 307 MODULE_DESCRIPTION("xHCI Platform Host Controller Driver");
 308 MODULE_LICENSE("GPL");