drivers/usb/host/ehci-platform.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Generic platform ehci driver
   4  *
   5  * Copyright 2007 Steven Brown <[email protected]>
   6  * Copyright 2010-2012 Hauke Mehrtens <[email protected]>
   7  * Copyright 2014 Hans de Goede <[email protected]>
   8  *
   9  * Derived from the ohci-ssb driver
  10  * Copyright 2007 Michael Buesch <[email protected]>
  11  *
  12  * Derived from the EHCI-PCI driver
  13  * Copyright (c) 2000-2004 by David Brownell
  14  *
  15  * Derived from the ohci-pci driver
  16  * Copyright 1999 Roman Weissgaerber
  17  * Copyright 2000-2002 David Brownell
  18  * Copyright 1999 Linus Torvalds
  19  * Copyright 1999 Gregory P. Smith
  20  */
  21 #include <linux/acpi.h>
  22 #include <linux/clk.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/err.h>
  25 #include <linux/kernel.h>
  26 #include <linux/hrtimer.h>
  27 #include <linux/io.h>
  28 #include <linux/module.h>
  29 #include <linux/of.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/reset.h>
  32 #include <linux/sys_soc.h>
  33 #include <linux/timer.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/hcd.h>
  36 #include <linux/usb/ehci_pdriver.h>
  37 #include <linux/usb/of.h>
  38
  39 #include "ehci.h"
  40
  41 #define DRIVER_DESC "EHCI generic platform driver"
  42 #define EHCI_MAX_CLKS 4
  43 #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
  44
  45 struct ehci_platform_priv {
  46         struct clk *clks[EHCI_MAX_CLKS];
  47         struct reset_control *rsts;
  48         bool reset_on_resume;
  49         bool quirk_poll;
  50         struct timer_list poll_timer;
  51         struct delayed_work poll_work;
  52 };
  53
  54 static const char hcd_name[] = "ehci-platform";
  55
  56 static int ehci_platform_reset(struct usb_hcd *hcd)
  57 {
  58         struct platform_device *pdev = to_platform_device(hcd->self.controller);
  59         struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
  60         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  61         int retval;
  62
  63         ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
  64
  65         if (pdata->pre_setup) {
  66                 retval = pdata->pre_setup(hcd);
  67                 if (retval < 0)
  68                         return retval;
  69         }
  70
  71         ehci->caps = hcd->regs + pdata->caps_offset;
  72         retval = ehci_setup(hcd);
  73         if (retval)
  74                 return retval;
  75
  76         if (pdata->no_io_watchdog)
  77                 ehci->need_io_watchdog = 0;
  78         return 0;
  79 }
  80
  81 static int ehci_platform_power_on(struct platform_device *dev)
  82 {
  83         struct usb_hcd *hcd = platform_get_drvdata(dev);
  84         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
  85         int clk, ret;
  86
  87         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
  88                 ret = clk_prepare_enable(priv->clks[clk]);
  89                 if (ret)
  90                         goto err_disable_clks;
  91         }
  92
  93         return 0;
  94
  95 err_disable_clks:
  96         while (--clk >= 0)
  97                 clk_disable_unprepare(priv->clks[clk]);
  98
  99         return ret;
 100 }
 101
 102 static void ehci_platform_power_off(struct platform_device *dev)
 103 {
 104         struct usb_hcd *hcd = platform_get_drvdata(dev);
 105         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 106         int clk;
 107
 108         for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
 109                 if (priv->clks[clk])
 110                         clk_disable_unprepare(priv->clks[clk]);
 111 }
 112
 113 static struct hc_driver __read_mostly ehci_platform_hc_driver;
 114
 115 static const struct ehci_driver_overrides platform_overrides __initconst = {
 116         .reset =                ehci_platform_reset,
 117         .extra_priv_size =      sizeof(struct ehci_platform_priv),
 118 };
 119
 120 static struct usb_ehci_pdata ehci_platform_defaults = {
 121         .power_on =             ehci_platform_power_on,
 122         .power_suspend =        ehci_platform_power_off,
 123         .power_off =            ehci_platform_power_off,
 124 };
 125
 126 /**
 127  * quirk_poll_check_port_status - Poll port_status if the device sticks
 128  * @ehci: the ehci hcd pointer
 129  *
 130  * Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting
 131  * stuck very rarely after a full/low usb device was disconnected. To
 132  * detect such a situation, the controllers require a special way which poll
 133  * the EHCI PORTSC register.
 134  *
 135  * Return: true if the controller's port_status indicated getting stuck
 136  */
 137 static bool quirk_poll_check_port_status(struct ehci_hcd *ehci)
 138 {
 139         u32 port_status = ehci_readl(ehci, &ehci->regs->port_status[0]);
 140
 141         if (!(port_status & PORT_OWNER) &&
 142              (port_status & PORT_POWER) &&
 143             !(port_status & PORT_CONNECT) &&
 144              (port_status & PORT_LS_MASK))
 145                 return true;
 146
 147         return false;
 148 }
 149
 150 /**
 151  * quirk_poll_rebind_companion - rebind comanion device to recover
 152  * @ehci: the ehci hcd pointer
 153  *
 154  * Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting
 155  * stuck very rarely after a full/low usb device was disconnected. To
 156  * recover from such a situation, the controllers require changing the OHCI
 157  * functional state.
 158  */
 159 static void quirk_poll_rebind_companion(struct ehci_hcd *ehci)
 160 {
 161         struct device *companion_dev;
 162         struct usb_hcd *hcd = ehci_to_hcd(ehci);
 163
 164         companion_dev = usb_of_get_companion_dev(hcd->self.controller);
 165         if (!companion_dev)
 166                 return;
 167
 168         device_release_driver(companion_dev);
 169         if (device_attach(companion_dev) < 0)
 170                 ehci_err(ehci, "%s: failed\n", __func__);
 171
 172         put_device(companion_dev);
 173 }
 174
 175 static void quirk_poll_work(struct work_struct *work)
 176 {
 177         struct ehci_platform_priv *priv =
 178                 container_of(to_delayed_work(work), struct ehci_platform_priv,
 179                              poll_work);
 180         struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd,
 181                                              priv);
 182
 183         /* check the status twice to reduce misdetection rate */
 184         if (!quirk_poll_check_port_status(ehci))
 185                 return;
 186         udelay(10);
 187         if (!quirk_poll_check_port_status(ehci))
 188                 return;
 189
 190         ehci_dbg(ehci, "%s: detected getting stuck. rebind now!\n", __func__);
 191         quirk_poll_rebind_companion(ehci);
 192 }
 193
 194 static void quirk_poll_timer(struct timer_list *t)
 195 {
 196         struct ehci_platform_priv *priv = from_timer(priv, t, poll_timer);
 197         struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd,
 198                                              priv);
 199
 200         if (quirk_poll_check_port_status(ehci)) {
 201                 /*
 202                  * Now scheduling the work for testing the port more. Note that
 203                  * updating the status is possible to be delayed when
 204                  * reconnection. So, this uses delayed work with 5 ms delay
 205                  * to avoid misdetection.
 206                  */
 207                 schedule_delayed_work(&priv->poll_work, msecs_to_jiffies(5));
 208         }
 209
 210         mod_timer(&priv->poll_timer, jiffies + HZ);
 211 }
 212
 213 static void quirk_poll_init(struct ehci_platform_priv *priv)
 214 {
 215         INIT_DELAYED_WORK(&priv->poll_work, quirk_poll_work);
 216         timer_setup(&priv->poll_timer, quirk_poll_timer, 0);
 217         mod_timer(&priv->poll_timer, jiffies + HZ);
 218 }
 219
 220 static void quirk_poll_end(struct ehci_platform_priv *priv)
 221 {
 222         del_timer_sync(&priv->poll_timer);
 223         cancel_delayed_work(&priv->poll_work);
 224 }
 225
 226 static const struct soc_device_attribute quirk_poll_match[] = {
 227         { .family = "R-Car Gen3" },
 228         { /* sentinel*/ }
 229 };
 230
 231 static int ehci_platform_probe(struct platform_device *dev)
 232 {
 233         struct usb_hcd *hcd;
 234         struct resource *res_mem;
 235         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 236         struct ehci_platform_priv *priv;
 237         struct ehci_hcd *ehci;
 238         int err, irq, clk = 0;
 239
 240         if (usb_disabled())
 241                 return -ENODEV;
 242
 243         /*
 244          * Use reasonable defaults so platforms don't have to provide these
 245          * with DT probing on ARM.
 246          */
 247         if (!pdata)
 248                 pdata = &ehci_platform_defaults;
 249
 250         err = dma_coerce_mask_and_coherent(&dev->dev,
 251                 pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
 252         if (err) {
 253                 dev_err(&dev->dev, "Error: DMA mask configuration failed\n");
 254                 return err;
 255         }
 256
 257         irq = platform_get_irq(dev, 0);
 258         if (irq < 0)
 259                 return irq;
 260
 261         hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
 262                              dev_name(&dev->dev));
 263         if (!hcd)
 264                 return -ENOMEM;
 265
 266         platform_set_drvdata(dev, hcd);
 267         dev->dev.platform_data = pdata;
 268         priv = hcd_to_ehci_priv(hcd);
 269         ehci = hcd_to_ehci(hcd);
 270
 271         if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
 272                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
 273                         ehci->big_endian_mmio = 1;
 274
 275                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
 276                         ehci->big_endian_desc = 1;
 277
 278                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
 279                         ehci->big_endian_mmio = ehci->big_endian_desc = 1;
 280
 281                 if (of_property_read_bool(dev->dev.of_node,
 282                                           "needs-reset-on-resume"))
 283                         priv->reset_on_resume = true;
 284
 285                 if (of_property_read_bool(dev->dev.of_node,
 286                                           "has-transaction-translator"))
 287                         hcd->has_tt = 1;
 288
 289                 if (soc_device_match(quirk_poll_match))
 290                         priv->quirk_poll = true;
 291
 292                 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
 293                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
 294                         if (IS_ERR(priv->clks[clk])) {
 295                                 err = PTR_ERR(priv->clks[clk]);
 296                                 if (err == -EPROBE_DEFER)
 297                                         goto err_put_clks;
 298                                 priv->clks[clk] = NULL;
 299                                 break;
 300                         }
 301                 }
 302         }
 303
 304         priv->rsts = devm_reset_control_array_get_optional_shared(&dev->dev);
 305         if (IS_ERR(priv->rsts)) {
 306                 err = PTR_ERR(priv->rsts);
 307                 goto err_put_clks;
 308         }
 309
 310         err = reset_control_deassert(priv->rsts);
 311         if (err)
 312                 goto err_put_clks;
 313
 314         if (pdata->big_endian_desc)
 315                 ehci->big_endian_desc = 1;
 316         if (pdata->big_endian_mmio)
 317                 ehci->big_endian_mmio = 1;
 318         if (pdata->has_tt)
 319                 hcd->has_tt = 1;
 320         if (pdata->reset_on_resume)
 321                 priv->reset_on_resume = true;
 322
 323 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 324         if (ehci->big_endian_mmio) {
 325                 dev_err(&dev->dev,
 326                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
 327                 err = -EINVAL;
 328                 goto err_reset;
 329         }
 330 #endif
 331 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
 332         if (ehci->big_endian_desc) {
 333                 dev_err(&dev->dev,
 334                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
 335                 err = -EINVAL;
 336                 goto err_reset;
 337         }
 338 #endif
 339
 340         if (pdata->power_on) {
 341                 err = pdata->power_on(dev);
 342                 if (err < 0)
 343                         goto err_reset;
 344         }
 345
 346         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 347         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
 348         if (IS_ERR(hcd->regs)) {
 349                 err = PTR_ERR(hcd->regs);
 350                 goto err_power;
 351         }
 352         hcd->rsrc_start = res_mem->start;
 353         hcd->rsrc_len = resource_size(res_mem);
 354
 355         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 356         if (err)
 357                 goto err_power;
 358
 359         device_wakeup_enable(hcd->self.controller);
 360         device_enable_async_suspend(hcd->self.controller);
 361         platform_set_drvdata(dev, hcd);
 362
 363         if (priv->quirk_poll)
 364                 quirk_poll_init(priv);
 365
 366         return err;
 367
 368 err_power:
 369         if (pdata->power_off)
 370                 pdata->power_off(dev);
 371 err_reset:
 372         reset_control_assert(priv->rsts);
 373 err_put_clks:
 374         while (--clk >= 0)
 375                 clk_put(priv->clks[clk]);
 376
 377         if (pdata == &ehci_platform_defaults)
 378                 dev->dev.platform_data = NULL;
 379
 380         usb_put_hcd(hcd);
 381
 382         return err;
 383 }
 384
 385 static int ehci_platform_remove(struct platform_device *dev)
 386 {
 387         struct usb_hcd *hcd = platform_get_drvdata(dev);
 388         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 389         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 390         int clk;
 391
 392         if (priv->quirk_poll)
 393                 quirk_poll_end(priv);
 394
 395         usb_remove_hcd(hcd);
 396
 397         if (pdata->power_off)
 398                 pdata->power_off(dev);
 399
 400         reset_control_assert(priv->rsts);
 401
 402         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
 403                 clk_put(priv->clks[clk]);
 404
 405         usb_put_hcd(hcd);
 406
 407         if (pdata == &ehci_platform_defaults)
 408                 dev->dev.platform_data = NULL;
 409
 410         return 0;
 411 }
 412
 413 #ifdef CONFIG_PM_SLEEP
 414 static int ehci_platform_suspend(struct device *dev)
 415 {
 416         struct usb_hcd *hcd = dev_get_drvdata(dev);
 417         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
 418         struct platform_device *pdev = to_platform_device(dev);
 419         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 420         bool do_wakeup = device_may_wakeup(dev);
 421         int ret;
 422
 423         if (priv->quirk_poll)
 424                 quirk_poll_end(priv);
 425
 426         ret = ehci_suspend(hcd, do_wakeup);
 427         if (ret)
 428                 return ret;
 429
 430         if (pdata->power_suspend)
 431                 pdata->power_suspend(pdev);
 432
 433         return ret;
 434 }
 435
 436 static int ehci_platform_resume(struct device *dev)
 437 {
 438         struct usb_hcd *hcd = dev_get_drvdata(dev);
 439         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
 440         struct platform_device *pdev = to_platform_device(dev);
 441         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 442         struct device *companion_dev;
 443
 444         if (pdata->power_on) {
 445                 int err = pdata->power_on(pdev);
 446                 if (err < 0)
 447                         return err;
 448         }
 449
 450         companion_dev = usb_of_get_companion_dev(hcd->self.controller);
 451         if (companion_dev) {
 452                 device_pm_wait_for_dev(hcd->self.controller, companion_dev);
 453                 put_device(companion_dev);
 454         }
 455
 456         ehci_resume(hcd, priv->reset_on_resume);
 457
 458         pm_runtime_disable(dev);
 459         pm_runtime_set_active(dev);
 460         pm_runtime_enable(dev);
 461
 462         if (priv->quirk_poll)
 463                 quirk_poll_init(priv);
 464
 465         return 0;
 466 }
 467 #endif /* CONFIG_PM_SLEEP */
 468
 469 static const struct of_device_id vt8500_ehci_ids[] = {
 470         { .compatible = "via,vt8500-ehci", },
 471         { .compatible = "wm,prizm-ehci", },
 472         { .compatible = "generic-ehci", },
 473         { .compatible = "cavium,octeon-6335-ehci", },
 474         {}
 475 };
 476 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
 477
 478 #ifdef CONFIG_ACPI
 479 static const struct acpi_device_id ehci_acpi_match[] = {
 480         { "PNP0D20", 0 }, /* EHCI controller without debug */
 481         { }
 482 };
 483 MODULE_DEVICE_TABLE(acpi, ehci_acpi_match);
 484 #endif
 485
 486 static const struct platform_device_id ehci_platform_table[] = {
 487         { "ehci-platform", 0 },
 488         { }
 489 };
 490 MODULE_DEVICE_TABLE(platform, ehci_platform_table);
 491
 492 static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
 493         ehci_platform_resume);
 494
 495 static struct platform_driver ehci_platform_driver = {
 496         .id_table       = ehci_platform_table,
 497         .probe          = ehci_platform_probe,
 498         .remove         = ehci_platform_remove,
 499         .shutdown       = usb_hcd_platform_shutdown,
 500         .driver         = {
 501                 .name   = "ehci-platform",
 502                 .pm     = &ehci_platform_pm_ops,
 503                 .of_match_table = vt8500_ehci_ids,
 504                 .acpi_match_table = ACPI_PTR(ehci_acpi_match),
 505         }
 506 };
 507
 508 static int __init ehci_platform_init(void)
 509 {
 510         if (usb_disabled())
 511                 return -ENODEV;
 512
 513         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 514
 515         ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
 516         return platform_driver_register(&ehci_platform_driver);
 517 }
 518 module_init(ehci_platform_init);
 519
 520 static void __exit ehci_platform_cleanup(void)
 521 {
 522         platform_driver_unregister(&ehci_platform_driver);
 523 }
 524 module_exit(ehci_platform_cleanup);
 525
 526 MODULE_DESCRIPTION(DRIVER_DESC);
 527 MODULE_AUTHOR("Hauke Mehrtens");
 528 MODULE_AUTHOR("Alan Stern");
 529 MODULE_LICENSE("GPL");