kernel/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
  23 #include "xhci.h"
  24 #include "xhci-mvebu.h"
  25 #include "xhci-rcar.h"
  26
  27 static struct hc_driver __read_mostly xhci_plat_hc_driver;
  28
  29 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
  30 {
  31         /*
  32          * As of now platform drivers don't provide MSI support so we ensure
  33          * here that the generic code does not try to make a pci_dev from our
  34          * dev struct in order to setup MSI
  35          */
  36         xhci->quirks |= XHCI_PLAT;
  37 }
  38
  39 /* called during probe() after chip reset completes */
  40 static int xhci_plat_setup(struct usb_hcd *hcd)
  41 {
  42         struct device_node *of_node = hcd->self.controller->of_node;
  43         int ret;
  44
  45         if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
  46             of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) {
  47                 ret = xhci_rcar_init_quirk(hcd);
  48                 if (ret)
  49                         return ret;
  50         }
  51
  52         return xhci_gen_setup(hcd, xhci_plat_quirks);
  53 }
  54
  55 static int xhci_plat_start(struct usb_hcd *hcd)
  56 {
  57         struct device_node *of_node = hcd->self.controller->of_node;
  58
  59         if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
  60             of_device_is_compatible(of_node, "renesas,xhci-r8a7791"))
  61                 xhci_rcar_start(hcd);
  62
  63         return xhci_run(hcd);
  64 }
  65
  66 static int xhci_plat_probe(struct platform_device *pdev)
  67 {
  68         struct device_node      *node = pdev->dev.of_node;
  69         struct usb_xhci_pdata   *pdata = dev_get_platdata(&pdev->dev);
  70         const struct hc_driver  *driver;
  71         struct xhci_hcd         *xhci;
  72         struct resource         *res;
  73         struct usb_hcd          *hcd;
  74         struct clk              *clk;
  75         int                     ret;
  76         int                     irq;
  77
  78         if (usb_disabled())
  79                 return -ENODEV;
  80
  81         driver = &xhci_plat_hc_driver;
  82
  83         irq = platform_get_irq(pdev, 0);
  84         if (irq < 0)
  85                 return -ENODEV;
  86
  87         /* Initialize dma_mask and coherent_dma_mask to 32-bits */
  88         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
  89         if (ret)
  90                 return ret;
  91         if (!pdev->dev.dma_mask)
  92                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
  93         else
  94                 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
  95
  96         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  97         if (!hcd)
  98                 return -ENOMEM;
  99
 100         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 101         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 102         if (IS_ERR(hcd->regs)) {
 103                 ret = PTR_ERR(hcd->regs);
 104                 goto put_hcd;
 105         }
 106
 107         hcd->rsrc_start = res->start;
 108         hcd->rsrc_len = resource_size(res);
 109
 110         /*
 111          * Not all platforms have a clk so it is not an error if the
 112          * clock does not exists.
 113          */
 114         clk = devm_clk_get(&pdev->dev, NULL);
 115         if (!IS_ERR(clk)) {
 116                 ret = clk_prepare_enable(clk);
 117                 if (ret)
 118                         goto put_hcd;
 119         }
 120
 121         if (of_device_is_compatible(pdev->dev.of_node,
 122                                     "marvell,armada-375-xhci") ||
 123             of_device_is_compatible(pdev->dev.of_node,
 124                                     "marvell,armada-380-xhci")) {
 125                 ret = xhci_mvebu_mbus_init_quirk(pdev);
 126                 if (ret)
 127                         goto disable_clk;
 128         }
 129
 130         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 131         if (ret)
 132                 goto disable_clk;
 133
 134         device_wakeup_enable(hcd->self.controller);
 135
 136         /* USB 2.0 roothub is stored in the platform_device now. */
 137         hcd = platform_get_drvdata(pdev);
 138         xhci = hcd_to_xhci(hcd);
 139         xhci->clk = clk;
 140         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
 141                         dev_name(&pdev->dev), hcd);
 142         if (!xhci->shared_hcd) {
 143                 ret = -ENOMEM;
 144                 goto dealloc_usb2_hcd;
 145         }
 146
 147         if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
 148                         (pdata && pdata->usb3_lpm_capable))
 149                 xhci->quirks |= XHCI_LPM_SUPPORT;
 150         /*
 151          * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
 152          * is called by usb_add_hcd().
 153          */
 154         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 155
 156         if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
 157                 xhci->shared_hcd->can_do_streams = 1;
 158
 159         hcd->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
 160         if (IS_ERR(hcd->usb_phy)) {
 161                 ret = PTR_ERR(hcd->usb_phy);
 162                 if (ret == -EPROBE_DEFER)
 163                         goto put_usb3_hcd;
 164                 hcd->usb_phy = NULL;
 165         } else {
 166                 ret = usb_phy_init(hcd->usb_phy);
 167                 if (ret)
 168                         goto put_usb3_hcd;
 169         }
 170
 171         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 172         if (ret)
 173                 goto disable_usb_phy;
 174
 175         return 0;
 176
 177 disable_usb_phy:
 178         usb_phy_shutdown(hcd->usb_phy);
 179
 180 put_usb3_hcd:
 181         usb_put_hcd(xhci->shared_hcd);
 182
 183 dealloc_usb2_hcd:
 184         usb_remove_hcd(hcd);
 185
 186 disable_clk:
 187         if (!IS_ERR(clk))
 188                 clk_disable_unprepare(clk);
 189
 190 put_hcd:
 191         usb_put_hcd(hcd);
 192
 193         return ret;
 194 }
 195
 196 static int xhci_plat_remove(struct platform_device *dev)
 197 {
 198         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 199         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 200         struct clk *clk = xhci->clk;
 201
 202         usb_remove_hcd(xhci->shared_hcd);
 203         usb_phy_shutdown(hcd->usb_phy);
 204         usb_put_hcd(xhci->shared_hcd);
 205
 206         usb_remove_hcd(hcd);
 207         if (!IS_ERR(clk))
 208                 clk_disable_unprepare(clk);
 209         usb_put_hcd(hcd);
 210         kfree(xhci);
 211
 212         return 0;
 213 }
 214
 215 #ifdef CONFIG_PM_SLEEP
 216 static int xhci_plat_suspend(struct device *dev)
 217 {
 218         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 219         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 220
 221         /*
 222          * xhci_suspend() needs `do_wakeup` to know whether host is allowed
 223          * to do wakeup during suspend. Since xhci_plat_suspend is currently
 224          * only designed for system suspend, device_may_wakeup() is enough
 225          * to dertermine whether host is allowed to do wakeup. Need to
 226          * reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
 227          * also applies to runtime suspend.
 228          */
 229         return xhci_suspend(xhci, device_may_wakeup(dev));
 230 }
 231
 232 static int xhci_plat_resume(struct device *dev)
 233 {
 234         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 235         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 236
 237         return xhci_resume(xhci, 0);
 238 }
 239
 240 static const struct dev_pm_ops xhci_plat_pm_ops = {
 241         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
 242 };
 243 #define DEV_PM_OPS      (&xhci_plat_pm_ops)
 244 #else
 245 #define DEV_PM_OPS      NULL
 246 #endif /* CONFIG_PM */
 247
 248 #ifdef CONFIG_OF
 249 static const struct of_device_id usb_xhci_of_match[] = {
 250         { .compatible = "generic-xhci" },
 251         { .compatible = "xhci-platform" },
 252         { .compatible = "marvell,armada-375-xhci"},
 253         { .compatible = "marvell,armada-380-xhci"},
 254         { .compatible = "renesas,xhci-r8a7790"},
 255         { .compatible = "renesas,xhci-r8a7791"},
 256         { },
 257 };
 258 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 259 #endif
 260
 261 static struct platform_driver usb_xhci_driver = {
 262         .probe  = xhci_plat_probe,
 263         .remove = xhci_plat_remove,
 264         .driver = {
 265                 .name = "xhci-hcd",
 266                 .pm = DEV_PM_OPS,
 267                 .of_match_table = of_match_ptr(usb_xhci_of_match),
 268         },
 269 };
 270 MODULE_ALIAS("platform:xhci-hcd");
 271
 272 static int __init xhci_plat_init(void)
 273 {
 274         xhci_init_driver(&xhci_plat_hc_driver, xhci_plat_setup);
 275         xhci_plat_hc_driver.start = xhci_plat_start;
 276         return platform_driver_register(&usb_xhci_driver);
 277 }
 278 module_init(xhci_plat_init);
 279
 280 static void __exit xhci_plat_exit(void)
 281 {
 282         platform_driver_unregister(&usb_xhci_driver);
 283 }
 284 module_exit(xhci_plat_exit);
 285
 286 MODULE_DESCRIPTION("xHCI Platform Host Controller Driver");
 287 MODULE_LICENSE("GPL");