1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Generic platform ehci driver 4 * 5 * Copyright 2007 Steven Brown <sbrown@cortland.com> 6 * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de> 7 * Copyright 2014 Hans de Goede <hdegoede@redhat.com> 8 * 9 * Derived from the ohci-ssb driver 10 * Copyright 2007 Michael Buesch <m@bues.ch> 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 #define BCM_USB_FIFO_THRESHOLD 0x00800040 46 47 struct ehci_platform_priv { 48 struct clk *clks[EHCI_MAX_CLKS]; 49 struct reset_control *rsts; 50 bool reset_on_resume; 51 bool quirk_poll; 52 struct timer_list poll_timer; 53 struct delayed_work poll_work; 54 }; 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 79 if (of_device_is_compatible(pdev->dev.of_node, "brcm,xgs-iproc-ehci")) 80 ehci_writel(ehci, BCM_USB_FIFO_THRESHOLD, 81 &ehci->regs->brcm_insnreg[1]); 82 83 return 0; 84 } 85 86 static int ehci_platform_power_on(struct platform_device *dev) 87 { 88 struct usb_hcd *hcd = platform_get_drvdata(dev); 89 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 90 int clk, ret; 91 92 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) { 93 ret = clk_prepare_enable(priv->clks[clk]); 94 if (ret) 95 goto err_disable_clks; 96 } 97 98 return 0; 99 100 err_disable_clks: 101 while (--clk >= 0) 102 clk_disable_unprepare(priv->clks[clk]); 103 104 return ret; 105 } 106 107 static void ehci_platform_power_off(struct platform_device *dev) 108 { 109 struct usb_hcd *hcd = platform_get_drvdata(dev); 110 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 111 int clk; 112 113 for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--) 114 if (priv->clks[clk]) 115 clk_disable_unprepare(priv->clks[clk]); 116 } 117 118 static struct hc_driver __read_mostly ehci_platform_hc_driver; 119 120 static const struct ehci_driver_overrides platform_overrides __initconst = { 121 .reset = ehci_platform_reset, 122 .extra_priv_size = sizeof(struct ehci_platform_priv), 123 }; 124 125 static struct usb_ehci_pdata ehci_platform_defaults = { 126 .power_on = ehci_platform_power_on, 127 .power_suspend = ehci_platform_power_off, 128 .power_off = ehci_platform_power_off, 129 }; 130 131 /** 132 * quirk_poll_check_port_status - Poll port_status if the device sticks 133 * @ehci: the ehci hcd pointer 134 * 135 * Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting 136 * stuck very rarely after a full/low usb device was disconnected. To 137 * detect such a situation, the controllers require a special way which poll 138 * the EHCI PORTSC register. 139 * 140 * Return: true if the controller's port_status indicated getting stuck 141 */ 142 static bool quirk_poll_check_port_status(struct ehci_hcd *ehci) 143 { 144 u32 port_status = ehci_readl(ehci, &ehci->regs->port_status[0]); 145 146 if (!(port_status & PORT_OWNER) && 147 (port_status & PORT_POWER) && 148 !(port_status & PORT_CONNECT) && 149 (port_status & PORT_LS_MASK)) 150 return true; 151 152 return false; 153 } 154 155 /** 156 * quirk_poll_rebind_companion - rebind comanion device to recover 157 * @ehci: the ehci hcd pointer 158 * 159 * Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting 160 * stuck very rarely after a full/low usb device was disconnected. To 161 * recover from such a situation, the controllers require changing the OHCI 162 * functional state. 163 */ 164 static void quirk_poll_rebind_companion(struct ehci_hcd *ehci) 165 { 166 struct device *companion_dev; 167 struct usb_hcd *hcd = ehci_to_hcd(ehci); 168 169 companion_dev = usb_of_get_companion_dev(hcd->self.controller); 170 if (!companion_dev) 171 return; 172 173 device_release_driver(companion_dev); 174 if (device_attach(companion_dev) < 0) 175 ehci_err(ehci, "%s: failed\n", __func__); 176 177 put_device(companion_dev); 178 } 179 180 static void quirk_poll_work(struct work_struct *work) 181 { 182 struct ehci_platform_priv *priv = 183 container_of(to_delayed_work(work), struct ehci_platform_priv, 184 poll_work); 185 struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd, 186 priv); 187 188 /* check the status twice to reduce misdetection rate */ 189 if (!quirk_poll_check_port_status(ehci)) 190 return; 191 udelay(10); 192 if (!quirk_poll_check_port_status(ehci)) 193 return; 194 195 ehci_dbg(ehci, "%s: detected getting stuck. rebind now!\n", __func__); 196 quirk_poll_rebind_companion(ehci); 197 } 198 199 static void quirk_poll_timer(struct timer_list *t) 200 { 201 struct ehci_platform_priv *priv = timer_container_of(priv, t, 202 poll_timer); 203 struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd, 204 priv); 205 206 if (quirk_poll_check_port_status(ehci)) { 207 /* 208 * Now scheduling the work for testing the port more. Note that 209 * updating the status is possible to be delayed when 210 * reconnection. So, this uses delayed work with 5 ms delay 211 * to avoid misdetection. 212 */ 213 schedule_delayed_work(&priv->poll_work, msecs_to_jiffies(5)); 214 } 215 216 mod_timer(&priv->poll_timer, jiffies + HZ); 217 } 218 219 static void quirk_poll_init(struct ehci_platform_priv *priv) 220 { 221 INIT_DELAYED_WORK(&priv->poll_work, quirk_poll_work); 222 timer_setup(&priv->poll_timer, quirk_poll_timer, 0); 223 mod_timer(&priv->poll_timer, jiffies + HZ); 224 } 225 226 static void quirk_poll_end(struct ehci_platform_priv *priv) 227 { 228 timer_delete_sync(&priv->poll_timer); 229 cancel_delayed_work(&priv->poll_work); 230 } 231 232 static const struct soc_device_attribute quirk_poll_match[] = { 233 { .family = "R-Car Gen3" }, 234 { /* sentinel*/ } 235 }; 236 237 static int ehci_platform_probe(struct platform_device *dev) 238 { 239 struct usb_hcd *hcd; 240 struct resource *res_mem; 241 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev); 242 struct ehci_platform_priv *priv; 243 struct ehci_hcd *ehci; 244 int err, irq, clk = 0; 245 246 if (usb_disabled()) 247 return -ENODEV; 248 249 /* 250 * Use reasonable defaults so platforms don't have to provide these 251 * with DT probing on ARM. 252 */ 253 if (!pdata) 254 pdata = &ehci_platform_defaults; 255 256 err = dma_coerce_mask_and_coherent(&dev->dev, 257 pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32)); 258 if (err) { 259 dev_err(&dev->dev, "Error: DMA mask configuration failed\n"); 260 return err; 261 } 262 263 irq = platform_get_irq(dev, 0); 264 if (irq < 0) 265 return irq; 266 267 hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev, 268 dev_name(&dev->dev)); 269 if (!hcd) 270 return -ENOMEM; 271 272 platform_set_drvdata(dev, hcd); 273 dev->dev.platform_data = pdata; 274 priv = hcd_to_ehci_priv(hcd); 275 ehci = hcd_to_ehci(hcd); 276 277 if (pdata == &ehci_platform_defaults && dev->dev.of_node) { 278 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs")) 279 ehci->big_endian_mmio = 1; 280 281 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc")) 282 ehci->big_endian_desc = 1; 283 284 if (of_property_read_bool(dev->dev.of_node, "big-endian")) 285 ehci->big_endian_mmio = ehci->big_endian_desc = 1; 286 287 if (of_property_read_bool(dev->dev.of_node, "spurious-oc")) 288 ehci->spurious_oc = 1; 289 290 if (of_property_read_bool(dev->dev.of_node, 291 "needs-reset-on-resume")) 292 priv->reset_on_resume = true; 293 294 if (of_property_read_bool(dev->dev.of_node, 295 "has-transaction-translator")) 296 hcd->has_tt = 1; 297 298 if (of_device_is_compatible(dev->dev.of_node, 299 "aspeed,ast2500-ehci") || 300 of_device_is_compatible(dev->dev.of_node, 301 "aspeed,ast2600-ehci")) 302 ehci->is_aspeed = 1; 303 304 if (soc_device_match(quirk_poll_match)) 305 priv->quirk_poll = true; 306 307 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) { 308 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk); 309 if (IS_ERR(priv->clks[clk])) { 310 err = PTR_ERR(priv->clks[clk]); 311 if (err == -EPROBE_DEFER) 312 goto err_put_clks; 313 priv->clks[clk] = NULL; 314 break; 315 } 316 } 317 } 318 319 priv->rsts = devm_reset_control_array_get_optional_shared(&dev->dev); 320 if (IS_ERR(priv->rsts)) { 321 err = PTR_ERR(priv->rsts); 322 goto err_put_clks; 323 } 324 325 err = reset_control_deassert(priv->rsts); 326 if (err) 327 goto err_put_clks; 328 329 if (pdata->big_endian_desc) 330 ehci->big_endian_desc = 1; 331 if (pdata->big_endian_mmio) 332 ehci->big_endian_mmio = 1; 333 if (pdata->has_tt) 334 hcd->has_tt = 1; 335 if (pdata->reset_on_resume) 336 priv->reset_on_resume = true; 337 if (pdata->spurious_oc) 338 ehci->spurious_oc = 1; 339 340 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO 341 if (ehci->big_endian_mmio) { 342 dev_err(&dev->dev, 343 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n"); 344 err = -EINVAL; 345 goto err_reset; 346 } 347 #endif 348 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC 349 if (ehci->big_endian_desc) { 350 dev_err(&dev->dev, 351 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n"); 352 err = -EINVAL; 353 goto err_reset; 354 } 355 #endif 356 357 if (pdata->power_on) { 358 err = pdata->power_on(dev); 359 if (err < 0) 360 goto err_reset; 361 } 362 363 hcd->regs = devm_platform_get_and_ioremap_resource(dev, 0, &res_mem); 364 if (IS_ERR(hcd->regs)) { 365 err = PTR_ERR(hcd->regs); 366 goto err_power; 367 } 368 hcd->rsrc_start = res_mem->start; 369 hcd->rsrc_len = resource_size(res_mem); 370 371 hcd->tpl_support = of_usb_host_tpl_support(dev->dev.of_node); 372 373 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 374 if (err) 375 goto err_power; 376 377 device_wakeup_enable(hcd->self.controller); 378 device_enable_async_suspend(hcd->self.controller); 379 platform_set_drvdata(dev, hcd); 380 381 if (priv->quirk_poll) 382 quirk_poll_init(priv); 383 384 return err; 385 386 err_power: 387 if (pdata->power_off) 388 pdata->power_off(dev); 389 err_reset: 390 reset_control_assert(priv->rsts); 391 err_put_clks: 392 while (--clk >= 0) 393 clk_put(priv->clks[clk]); 394 395 if (pdata == &ehci_platform_defaults) 396 dev->dev.platform_data = NULL; 397 398 usb_put_hcd(hcd); 399 400 return err; 401 } 402 403 static void ehci_platform_remove(struct platform_device *dev) 404 { 405 struct usb_hcd *hcd = platform_get_drvdata(dev); 406 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev); 407 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 408 int clk; 409 410 if (priv->quirk_poll) 411 quirk_poll_end(priv); 412 413 usb_remove_hcd(hcd); 414 415 if (pdata->power_off) 416 pdata->power_off(dev); 417 418 reset_control_assert(priv->rsts); 419 420 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) 421 clk_put(priv->clks[clk]); 422 423 usb_put_hcd(hcd); 424 425 if (pdata == &ehci_platform_defaults) 426 dev->dev.platform_data = NULL; 427 } 428 429 static int __maybe_unused ehci_platform_suspend(struct device *dev) 430 { 431 struct usb_hcd *hcd = dev_get_drvdata(dev); 432 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 433 struct platform_device *pdev = to_platform_device(dev); 434 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 435 bool do_wakeup = device_may_wakeup(dev); 436 int ret; 437 438 if (priv->quirk_poll) 439 quirk_poll_end(priv); 440 441 ret = ehci_suspend(hcd, do_wakeup); 442 if (ret) 443 return ret; 444 445 if (pdata->power_suspend) 446 pdata->power_suspend(pdev); 447 448 return ret; 449 } 450 451 static int __maybe_unused ehci_platform_resume(struct device *dev) 452 { 453 struct usb_hcd *hcd = dev_get_drvdata(dev); 454 struct usb_ehci_pdata *pdata = dev_get_platdata(dev); 455 struct platform_device *pdev = to_platform_device(dev); 456 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd); 457 struct device *companion_dev; 458 459 if (pdata->power_on) { 460 int err = pdata->power_on(pdev); 461 if (err < 0) 462 return err; 463 } 464 465 companion_dev = usb_of_get_companion_dev(hcd->self.controller); 466 if (companion_dev) { 467 device_pm_wait_for_dev(hcd->self.controller, companion_dev); 468 put_device(companion_dev); 469 } 470 471 ehci_resume(hcd, priv->reset_on_resume); 472 473 pm_runtime_disable(dev); 474 pm_runtime_set_active(dev); 475 pm_runtime_enable(dev); 476 477 if (priv->quirk_poll) 478 quirk_poll_init(priv); 479 480 return 0; 481 } 482 483 static const struct of_device_id vt8500_ehci_ids[] = { 484 { .compatible = "via,vt8500-ehci", }, 485 { .compatible = "wm,prizm-ehci", }, 486 { .compatible = "generic-ehci", }, 487 { .compatible = "cavium,octeon-6335-ehci", }, 488 {} 489 }; 490 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids); 491 492 #ifdef CONFIG_ACPI 493 static const struct acpi_device_id ehci_acpi_match[] = { 494 { "PNP0D20", 0 }, /* EHCI controller without debug */ 495 { } 496 }; 497 MODULE_DEVICE_TABLE(acpi, ehci_acpi_match); 498 #endif 499 500 static const struct platform_device_id ehci_platform_table[] = { 501 { "ehci-platform", 0 }, 502 { } 503 }; 504 MODULE_DEVICE_TABLE(platform, ehci_platform_table); 505 506 static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend, 507 ehci_platform_resume); 508 509 static struct platform_driver ehci_platform_driver = { 510 .id_table = ehci_platform_table, 511 .probe = ehci_platform_probe, 512 .remove = ehci_platform_remove, 513 .shutdown = usb_hcd_platform_shutdown, 514 .driver = { 515 .name = "ehci-platform", 516 .pm = pm_ptr(&ehci_platform_pm_ops), 517 .of_match_table = vt8500_ehci_ids, 518 .acpi_match_table = ACPI_PTR(ehci_acpi_match), 519 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 520 } 521 }; 522 523 static int __init ehci_platform_init(void) 524 { 525 if (usb_disabled()) 526 return -ENODEV; 527 528 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides); 529 return platform_driver_register(&ehci_platform_driver); 530 } 531 module_init(ehci_platform_init); 532 533 static void __exit ehci_platform_cleanup(void) 534 { 535 platform_driver_unregister(&ehci_platform_driver); 536 } 537 module_exit(ehci_platform_cleanup); 538 539 MODULE_DESCRIPTION(DRIVER_DESC); 540 MODULE_AUTHOR("Hauke Mehrtens"); 541 MODULE_AUTHOR("Alan Stern"); 542 MODULE_LICENSE("GPL"); 543