root/drivers/usb/host/xhci-plat.c

DEFINITIONS

1. xhci_priv_plat_start
2. xhci_priv_init_quirk
3. xhci_priv_resume_quirk
4. xhci_plat_quirks
5. xhci_plat_setup
6. xhci_plat_start
7. xhci_plat_probe
8. xhci_plat_remove
9. xhci_plat_suspend
10. xhci_plat_resume
11. xhci_plat_runtime_suspend
12. xhci_plat_runtime_resume
13. xhci_plat_init
14. xhci_plat_exit

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * xhci-plat.c - xHCI host controller driver platform Bus Glue.
   4  *
   5  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
   6  * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   7  *
   8  * A lot of code borrowed from the Linux xHCI driver.
   9  */
  10 
  11 #include <linux/clk.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/module.h>
  14 #include <linux/pci.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/usb/phy.h>
  19 #include <linux/slab.h>
  20 #include <linux/acpi.h>
  21 #include <linux/usb/of.h>
  22 
  23 #include "xhci.h"
  24 #include "xhci-plat.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_plat_priv),
  35         .reset = xhci_plat_setup,
  36         .start = xhci_plat_start,
  37 };
  38 
  39 static void xhci_priv_plat_start(struct usb_hcd *hcd)
  40 {
  41         struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
  42 
  43         if (priv->plat_start)
  44                 priv->plat_start(hcd);
  45 }
  46 
  47 static int xhci_priv_init_quirk(struct usb_hcd *hcd)
  48 {
  49         struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
  50 
  51         if (!priv->init_quirk)
  52                 return 0;
  53 
  54         return priv->init_quirk(hcd);
  55 }
  56 
  57 static int xhci_priv_resume_quirk(struct usb_hcd *hcd)
  58 {
  59         struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
  60 
  61         if (!priv->resume_quirk)
  62                 return 0;
  63 
  64         return priv->resume_quirk(hcd);
  65 }
  66 
  67 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
  68 {
  69         struct xhci_plat_priv *priv = xhci_to_priv(xhci);
  70 
  71         /*
  72          * As of now platform drivers don't provide MSI support so we ensure
  73          * here that the generic code does not try to make a pci_dev from our
  74          * dev struct in order to setup MSI
  75          */
  76         xhci->quirks |= XHCI_PLAT | priv->quirks;
  77 }
  78 
  79 /* called during probe() after chip reset completes */
  80 static int xhci_plat_setup(struct usb_hcd *hcd)
  81 {
  82         int ret;
  83 
  84 
  85         ret = xhci_priv_init_quirk(hcd);
  86         if (ret)
  87                 return ret;
  88 
  89         return xhci_gen_setup(hcd, xhci_plat_quirks);
  90 }
  91 
  92 static int xhci_plat_start(struct usb_hcd *hcd)
  93 {
  94         xhci_priv_plat_start(hcd);
  95         return xhci_run(hcd);
  96 }
  97 
  98 #ifdef CONFIG_OF
  99 static const struct xhci_plat_priv xhci_plat_marvell_armada = {
 100         .init_quirk = xhci_mvebu_mbus_init_quirk,
 101 };
 102 
 103 static const struct xhci_plat_priv xhci_plat_marvell_armada3700 = {
 104         .init_quirk = xhci_mvebu_a3700_init_quirk,
 105 };
 106 
 107 static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
 108         SET_XHCI_PLAT_PRIV_FOR_RCAR(XHCI_RCAR_FIRMWARE_NAME_V1)
 109 };
 110 
 111 static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
 112         SET_XHCI_PLAT_PRIV_FOR_RCAR(XHCI_RCAR_FIRMWARE_NAME_V3)
 113 };
 114 
 115 static const struct of_device_id usb_xhci_of_match[] = {
 116         {
 117                 .compatible = "generic-xhci",
 118         }, {
 119                 .compatible = "xhci-platform",
 120         }, {
 121                 .compatible = "marvell,armada-375-xhci",
 122                 .data = &xhci_plat_marvell_armada,
 123         }, {
 124                 .compatible = "marvell,armada-380-xhci",
 125                 .data = &xhci_plat_marvell_armada,
 126         }, {
 127                 .compatible = "marvell,armada3700-xhci",
 128                 .data = &xhci_plat_marvell_armada3700,
 129         }, {
 130                 .compatible = "renesas,xhci-r8a7790",
 131                 .data = &xhci_plat_renesas_rcar_gen2,
 132         }, {
 133                 .compatible = "renesas,xhci-r8a7791",
 134                 .data = &xhci_plat_renesas_rcar_gen2,
 135         }, {
 136                 .compatible = "renesas,xhci-r8a7793",
 137                 .data = &xhci_plat_renesas_rcar_gen2,
 138         }, {
 139                 .compatible = "renesas,xhci-r8a7795",
 140                 .data = &xhci_plat_renesas_rcar_gen3,
 141         }, {
 142                 .compatible = "renesas,xhci-r8a7796",
 143                 .data = &xhci_plat_renesas_rcar_gen3,
 144         }, {
 145                 .compatible = "renesas,rcar-gen2-xhci",
 146                 .data = &xhci_plat_renesas_rcar_gen2,
 147         }, {
 148                 .compatible = "renesas,rcar-gen3-xhci",
 149                 .data = &xhci_plat_renesas_rcar_gen3,
 150         },
 151         {},
 152 };
 153 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 154 #endif
 155 
 156 static int xhci_plat_probe(struct platform_device *pdev)
 157 {
 158         const struct xhci_plat_priv *priv_match;
 159         const struct hc_driver  *driver;
 160         struct device           *sysdev, *tmpdev;
 161         struct xhci_hcd         *xhci;
 162         struct resource         *res;
 163         struct usb_hcd          *hcd;
 164         int                     ret;
 165         int                     irq;
 166 
 167         if (usb_disabled())
 168                 return -ENODEV;
 169 
 170         driver = &xhci_plat_hc_driver;
 171 
 172         irq = platform_get_irq(pdev, 0);
 173         if (irq < 0)
 174                 return irq;
 175 
 176         /*
 177          * sysdev must point to a device that is known to the system firmware
 178          * or PCI hardware. We handle these three cases here:
 179          * 1. xhci_plat comes from firmware
 180          * 2. xhci_plat is child of a device from firmware (dwc3-plat)
 181          * 3. xhci_plat is grandchild of a pci device (dwc3-pci)
 182          */
 183         for (sysdev = &pdev->dev; sysdev; sysdev = sysdev->parent) {
 184                 if (is_of_node(sysdev->fwnode) ||
 185                         is_acpi_device_node(sysdev->fwnode))
 186                         break;
 187 #ifdef CONFIG_PCI
 188                 else if (sysdev->bus == &pci_bus_type)
 189                         break;
 190 #endif
 191         }
 192 
 193         if (!sysdev)
 194                 sysdev = &pdev->dev;
 195 
 196         /* Try to set 64-bit DMA first */
 197         if (WARN_ON(!sysdev->dma_mask))
 198                 /* Platform did not initialize dma_mask */
 199                 ret = dma_coerce_mask_and_coherent(sysdev,
 200                                                    DMA_BIT_MASK(64));
 201         else
 202                 ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(64));
 203 
 204         /* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
 205         if (ret) {
 206                 ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(32));
 207                 if (ret)
 208                         return ret;
 209         }
 210 
 211         pm_runtime_set_active(&pdev->dev);
 212         pm_runtime_enable(&pdev->dev);
 213         pm_runtime_get_noresume(&pdev->dev);
 214 
 215         hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
 216                                dev_name(&pdev->dev), NULL);
 217         if (!hcd) {
 218                 ret = -ENOMEM;
 219                 goto disable_runtime;
 220         }
 221 
 222         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 223         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 224         if (IS_ERR(hcd->regs)) {
 225                 ret = PTR_ERR(hcd->regs);
 226                 goto put_hcd;
 227         }
 228 
 229         hcd->rsrc_start = res->start;
 230         hcd->rsrc_len = resource_size(res);
 231 
 232         xhci = hcd_to_xhci(hcd);
 233 
 234         /*
 235          * Not all platforms have clks so it is not an error if the
 236          * clock do not exist.
 237          */
 238         xhci->reg_clk = devm_clk_get_optional(&pdev->dev, "reg");
 239         if (IS_ERR(xhci->reg_clk)) {
 240                 ret = PTR_ERR(xhci->reg_clk);
 241                 goto put_hcd;
 242         }
 243 
 244         ret = clk_prepare_enable(xhci->reg_clk);
 245         if (ret)
 246                 goto put_hcd;
 247 
 248         xhci->clk = devm_clk_get_optional(&pdev->dev, NULL);
 249         if (IS_ERR(xhci->clk)) {
 250                 ret = PTR_ERR(xhci->clk);
 251                 goto disable_reg_clk;
 252         }
 253 
 254         ret = clk_prepare_enable(xhci->clk);
 255         if (ret)
 256                 goto disable_reg_clk;
 257 
 258         priv_match = of_device_get_match_data(&pdev->dev);
 259         if (priv_match) {
 260                 struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
 261 
 262                 /* Just copy data for now */
 263                 if (priv_match)
 264                         *priv = *priv_match;
 265         }
 266 
 267         device_wakeup_enable(hcd->self.controller);
 268 
 269         xhci->main_hcd = hcd;
 270         xhci->shared_hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
 271                         dev_name(&pdev->dev), hcd);
 272         if (!xhci->shared_hcd) {
 273                 ret = -ENOMEM;
 274                 goto disable_clk;
 275         }
 276 
 277         /* imod_interval is the interrupt moderation value in nanoseconds. */
 278         xhci->imod_interval = 40000;
 279 
 280         /* Iterate over all parent nodes for finding quirks */
 281         for (tmpdev = &pdev->dev; tmpdev; tmpdev = tmpdev->parent) {
 282 
 283                 if (device_property_read_bool(tmpdev, "usb2-lpm-disable"))
 284                         xhci->quirks |= XHCI_HW_LPM_DISABLE;
 285 
 286                 if (device_property_read_bool(tmpdev, "usb3-lpm-capable"))
 287                         xhci->quirks |= XHCI_LPM_SUPPORT;
 288 
 289                 if (device_property_read_bool(tmpdev, "quirk-broken-port-ped"))
 290                         xhci->quirks |= XHCI_BROKEN_PORT_PED;
 291 
 292                 device_property_read_u32(tmpdev, "imod-interval-ns",
 293                                          &xhci->imod_interval);
 294         }
 295 
 296         hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
 297         if (IS_ERR(hcd->usb_phy)) {
 298                 ret = PTR_ERR(hcd->usb_phy);
 299                 if (ret == -EPROBE_DEFER)
 300                         goto put_usb3_hcd;
 301                 hcd->usb_phy = NULL;
 302         } else {
 303                 ret = usb_phy_init(hcd->usb_phy);
 304                 if (ret)
 305                         goto put_usb3_hcd;
 306         }
 307 
 308         hcd->tpl_support = of_usb_host_tpl_support(sysdev->of_node);
 309         xhci->shared_hcd->tpl_support = hcd->tpl_support;
 310         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 311         if (ret)
 312                 goto disable_usb_phy;
 313 
 314         if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
 315                 xhci->shared_hcd->can_do_streams = 1;
 316 
 317         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 318         if (ret)
 319                 goto dealloc_usb2_hcd;
 320 
 321         device_enable_async_suspend(&pdev->dev);
 322         pm_runtime_put_noidle(&pdev->dev);
 323 
 324         /*
 325          * Prevent runtime pm from being on as default, users should enable
 326          * runtime pm using power/control in sysfs.
 327          */
 328         pm_runtime_forbid(&pdev->dev);
 329 
 330         return 0;
 331 
 332 
 333 dealloc_usb2_hcd:
 334         usb_remove_hcd(hcd);
 335 
 336 disable_usb_phy:
 337         usb_phy_shutdown(hcd->usb_phy);
 338 
 339 put_usb3_hcd:
 340         usb_put_hcd(xhci->shared_hcd);
 341 
 342 disable_clk:
 343         clk_disable_unprepare(xhci->clk);
 344 
 345 disable_reg_clk:
 346         clk_disable_unprepare(xhci->reg_clk);
 347 
 348 put_hcd:
 349         usb_put_hcd(hcd);
 350 
 351 disable_runtime:
 352         pm_runtime_put_noidle(&pdev->dev);
 353         pm_runtime_disable(&pdev->dev);
 354 
 355         return ret;
 356 }
 357 
 358 static int xhci_plat_remove(struct platform_device *dev)
 359 {
 360         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 361         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 362         struct clk *clk = xhci->clk;
 363         struct clk *reg_clk = xhci->reg_clk;
 364         struct usb_hcd *shared_hcd = xhci->shared_hcd;
 365 
 366         pm_runtime_get_sync(&dev->dev);
 367         xhci->xhc_state |= XHCI_STATE_REMOVING;
 368 
 369         usb_remove_hcd(shared_hcd);
 370         xhci->shared_hcd = NULL;
 371         usb_phy_shutdown(hcd->usb_phy);
 372 
 373         usb_remove_hcd(hcd);
 374         usb_put_hcd(shared_hcd);
 375 
 376         clk_disable_unprepare(clk);
 377         clk_disable_unprepare(reg_clk);
 378         usb_put_hcd(hcd);
 379 
 380         pm_runtime_disable(&dev->dev);
 381         pm_runtime_put_noidle(&dev->dev);
 382         pm_runtime_set_suspended(&dev->dev);
 383 
 384         return 0;
 385 }
 386 
 387 static int __maybe_unused xhci_plat_suspend(struct device *dev)
 388 {
 389         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 390         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 391 
 392         /*
 393          * xhci_suspend() needs `do_wakeup` to know whether host is allowed
 394          * to do wakeup during suspend. Since xhci_plat_suspend is currently
 395          * only designed for system suspend, device_may_wakeup() is enough
 396          * to dertermine whether host is allowed to do wakeup. Need to
 397          * reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
 398          * also applies to runtime suspend.
 399          */
 400         return xhci_suspend(xhci, device_may_wakeup(dev));
 401 }
 402 
 403 static int __maybe_unused xhci_plat_resume(struct device *dev)
 404 {
 405         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 406         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 407         int ret;
 408 
 409         ret = xhci_priv_resume_quirk(hcd);
 410         if (ret)
 411                 return ret;
 412 
 413         return xhci_resume(xhci, 0);
 414 }
 415 
 416 static int __maybe_unused xhci_plat_runtime_suspend(struct device *dev)
 417 {
 418         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 419         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 420 
 421         return xhci_suspend(xhci, true);
 422 }
 423 
 424 static int __maybe_unused xhci_plat_runtime_resume(struct device *dev)
 425 {
 426         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 427         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 428 
 429         return xhci_resume(xhci, 0);
 430 }
 431 
 432 static const struct dev_pm_ops xhci_plat_pm_ops = {
 433         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
 434 
 435         SET_RUNTIME_PM_OPS(xhci_plat_runtime_suspend,
 436                            xhci_plat_runtime_resume,
 437                            NULL)
 438 };
 439 
 440 static const struct acpi_device_id usb_xhci_acpi_match[] = {
 441         /* XHCI-compliant USB Controller */
 442         { "PNP0D10", },
 443         { }
 444 };
 445 MODULE_DEVICE_TABLE(acpi, usb_xhci_acpi_match);
 446 
 447 static struct platform_driver usb_xhci_driver = {
 448         .probe  = xhci_plat_probe,
 449         .remove = xhci_plat_remove,
 450         .shutdown = usb_hcd_platform_shutdown,
 451         .driver = {
 452                 .name = "xhci-hcd",
 453                 .pm = &xhci_plat_pm_ops,
 454                 .of_match_table = of_match_ptr(usb_xhci_of_match),
 455                 .acpi_match_table = ACPI_PTR(usb_xhci_acpi_match),
 456         },
 457 };
 458 MODULE_ALIAS("platform:xhci-hcd");
 459 
 460 static int __init xhci_plat_init(void)
 461 {
 462         xhci_init_driver(&xhci_plat_hc_driver, &xhci_plat_overrides);
 463         return platform_driver_register(&usb_xhci_driver);
 464 }
 465 module_init(xhci_plat_init);
 466 
 467 static void __exit xhci_plat_exit(void)
 468 {
 469         platform_driver_unregister(&usb_xhci_driver);
 470 }
 471 module_exit(xhci_plat_exit);
 472 
 473 MODULE_DESCRIPTION("xHCI Platform Host Controller Driver");
 474 MODULE_LICENSE("GPL");