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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 | // SPDX-License-Identifier: GPL-2.0 /* * OHCI HCD (Host Controller Driver) for USB. * * TI DA8xx (OMAP-L1x) Bus Glue * * Derived from: ohci-omap.c and ohci-s3c2410.c * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com> */ #include <linux/clk.h> #include <linux/gpio/consumer.h> #include <linux/io.h> #include <linux/interrupt.h> #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/phy/phy.h> #include <linux/platform_data/usb-davinci.h> #include <linux/regulator/consumer.h> #include <linux/usb.h> #include <linux/usb/hcd.h> #include <asm/unaligned.h> #include "ohci.h" #define DRIVER_DESC "DA8XX" #define DRV_NAME "ohci-da8xx" static struct hc_driver __read_mostly ohci_da8xx_hc_driver; static int (*orig_ohci_hub_control)(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex, char *buf, u16 wLength); static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf); struct da8xx_ohci_hcd { struct usb_hcd *hcd; struct clk *usb11_clk; struct phy *usb11_phy; struct regulator *vbus_reg; struct notifier_block nb; struct gpio_desc *oc_gpio; }; #define to_da8xx_ohci(hcd) (struct da8xx_ohci_hcd *)(hcd_to_ohci(hcd)->priv) /* Over-current indicator change bitmask */ static volatile u16 ocic_mask; static int ohci_da8xx_enable(struct usb_hcd *hcd) { struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd); int ret; ret = clk_prepare_enable(da8xx_ohci->usb11_clk); if (ret) return ret; ret = phy_init(da8xx_ohci->usb11_phy); if (ret) goto err_phy_init; ret = phy_power_on(da8xx_ohci->usb11_phy); if (ret) goto err_phy_power_on; return 0; err_phy_power_on: phy_exit(da8xx_ohci->usb11_phy); err_phy_init: clk_disable_unprepare(da8xx_ohci->usb11_clk); return ret; } static void ohci_da8xx_disable(struct usb_hcd *hcd) { struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd); phy_power_off(da8xx_ohci->usb11_phy); phy_exit(da8xx_ohci->usb11_phy); clk_disable_unprepare(da8xx_ohci->usb11_clk); } static int ohci_da8xx_set_power(struct usb_hcd *hcd, int on) { struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd); struct device *dev = hcd->self.controller; int ret; if (!da8xx_ohci->vbus_reg) return 0; if (on) { ret = regulator_enable(da8xx_ohci->vbus_reg); if (ret) { dev_err(dev, "Failed to enable regulator: %d\n", ret); return ret; } } else { ret = regulator_disable(da8xx_ohci->vbus_reg); if (ret) { dev_err(dev, "Failed to disable regulator: %d\n", ret); return ret; } } return 0; } static int ohci_da8xx_get_power(struct usb_hcd *hcd) { struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd); if (da8xx_ohci->vbus_reg) return regulator_is_enabled(da8xx_ohci->vbus_reg); return 1; } static int ohci_da8xx_get_oci(struct usb_hcd *hcd) { struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd); unsigned int flags; int ret; if (da8xx_ohci->oc_gpio) return gpiod_get_value_cansleep(da8xx_ohci->oc_gpio); if (!da8xx_ohci->vbus_reg) return 0; ret = regulator_get_error_flags(da8xx_ohci->vbus_reg, &flags); if (ret) return ret; if (flags & REGULATOR_ERROR_OVER_CURRENT) return 1; return 0; } static int ohci_da8xx_has_set_power(struct usb_hcd *hcd) { struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd); if (da8xx_ohci->vbus_reg) return 1; return 0; } static int ohci_da8xx_has_oci(struct usb_hcd *hcd) { struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd); if (da8xx_ohci->oc_gpio) return 1; if (da8xx_ohci->vbus_reg) return 1; return 0; } static int ohci_da8xx_has_potpgt(struct usb_hcd *hcd) { struct device *dev = hcd->self.controller; struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev); if (hub && hub->potpgt) return 1; return 0; } static int ohci_da8xx_regulator_event(struct notifier_block *nb, unsigned long event, void *data) { struct da8xx_ohci_hcd *da8xx_ohci = container_of(nb, struct da8xx_ohci_hcd, nb); if (event & REGULATOR_EVENT_OVER_CURRENT) { ocic_mask |= 1 << 1; ohci_da8xx_set_power(da8xx_ohci->hcd, 0); } return 0; } static irqreturn_t ohci_da8xx_oc_thread(int irq, void *data) { struct da8xx_ohci_hcd *da8xx_ohci = data; struct device *dev = da8xx_ohci->hcd->self.controller; int ret; if (gpiod_get_value_cansleep(da8xx_ohci->oc_gpio) && da8xx_ohci->vbus_reg) { ret = regulator_disable(da8xx_ohci->vbus_reg); if (ret) dev_err(dev, "Failed to disable regulator: %d\n", ret); } return IRQ_HANDLED; } static int ohci_da8xx_register_notify(struct usb_hcd *hcd) { struct da8xx_ohci_hcd *da8xx_ohci = to_da8xx_ohci(hcd); struct device *dev = hcd->self.controller; int ret = 0; if (!da8xx_ohci->oc_gpio && da8xx_ohci->vbus_reg) { da8xx_ohci->nb.notifier_call = ohci_da8xx_regulator_event; ret = devm_regulator_register_notifier(da8xx_ohci->vbus_reg, &da8xx_ohci->nb); } if (ret) dev_err(dev, "Failed to register notifier: %d\n", ret); return ret; } static int ohci_da8xx_reset(struct usb_hcd *hcd) { struct device *dev = hcd->self.controller; struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); int result; u32 rh_a; dev_dbg(dev, "starting USB controller\n"); result = ohci_da8xx_enable(hcd); if (result < 0) return result; /* * DA8xx only have 1 port connected to the pins but the HC root hub * register A reports 2 ports, thus we'll have to override it... */ ohci->num_ports = 1; result = ohci_setup(hcd); if (result < 0) { ohci_da8xx_disable(hcd); return result; } /* * Since we're providing a board-specific root hub port power control * and over-current reporting, we have to override the HC root hub A * register's default value, so that ohci_hub_control() could return * the correct hub descriptor... */ rh_a = ohci_readl(ohci, &ohci->regs->roothub.a); if (ohci_da8xx_has_set_power(hcd)) { rh_a &= ~RH_A_NPS; rh_a |= RH_A_PSM; } if (ohci_da8xx_has_oci(hcd)) { rh_a &= ~RH_A_NOCP; rh_a |= RH_A_OCPM; } if (ohci_da8xx_has_potpgt(hcd)) { rh_a &= ~RH_A_POTPGT; rh_a |= hub->potpgt << 24; } ohci_writel(ohci, rh_a, &ohci->regs->roothub.a); return result; } /* * Update the status data from the hub with the over-current indicator change. */ static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf) { int length = orig_ohci_hub_status_data(hcd, buf); /* See if we have OCIC bit set on port 1 */ if (ocic_mask & (1 << 1)) { dev_dbg(hcd->self.controller, "over-current indicator change " "on port 1\n"); if (!length) length = 1; buf[0] |= 1 << 1; } return length; } /* * Look at the control requests to the root hub and see if we need to override. */ static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex, char *buf, u16 wLength) { struct device *dev = hcd->self.controller; int temp; switch (typeReq) { case GetPortStatus: /* Check the port number */ if (wIndex != 1) break; dev_dbg(dev, "GetPortStatus(%u)\n", wIndex); temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1); /* The port power status (PPS) bit defaults to 1 */ if (!ohci_da8xx_get_power(hcd)) temp &= ~RH_PS_PPS; /* The port over-current indicator (POCI) bit is always 0 */ if (ohci_da8xx_get_oci(hcd) > 0) temp |= RH_PS_POCI; /* The over-current indicator change (OCIC) bit is 0 too */ if (ocic_mask & (1 << wIndex)) temp |= RH_PS_OCIC; put_unaligned(cpu_to_le32(temp), (__le32 *)buf); return 0; case SetPortFeature: temp = 1; goto check_port; case ClearPortFeature: temp = 0; check_port: /* Check the port number */ if (wIndex != 1) break; switch (wValue) { case USB_PORT_FEAT_POWER: dev_dbg(dev, "%sPortFeature(%u): %s\n", temp ? "Set" : "Clear", wIndex, "POWER"); return ohci_da8xx_set_power(hcd, temp) ? -EPIPE : 0; case USB_PORT_FEAT_C_OVER_CURRENT: dev_dbg(dev, "%sPortFeature(%u): %s\n", temp ? "Set" : "Clear", wIndex, "C_OVER_CURRENT"); if (temp) ocic_mask |= 1 << wIndex; else ocic_mask &= ~(1 << wIndex); return 0; } } return orig_ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength); } /*-------------------------------------------------------------------------*/ #ifdef CONFIG_OF static const struct of_device_id da8xx_ohci_ids[] = { { .compatible = "ti,da830-ohci" }, { } }; MODULE_DEVICE_TABLE(of, da8xx_ohci_ids); #endif static int ohci_da8xx_probe(struct platform_device *pdev) { struct da8xx_ohci_hcd *da8xx_ohci; struct device *dev = &pdev->dev; int error, hcd_irq, oc_irq; struct usb_hcd *hcd; struct resource *mem; hcd = usb_create_hcd(&ohci_da8xx_hc_driver, dev, dev_name(dev)); if (!hcd) return -ENOMEM; da8xx_ohci = to_da8xx_ohci(hcd); da8xx_ohci->hcd = hcd; da8xx_ohci->usb11_clk = devm_clk_get(dev, NULL); if (IS_ERR(da8xx_ohci->usb11_clk)) { error = PTR_ERR(da8xx_ohci->usb11_clk); if (error != -EPROBE_DEFER) dev_err(dev, "Failed to get clock.\n"); goto err; } da8xx_ohci->usb11_phy = devm_phy_get(dev, "usb-phy"); if (IS_ERR(da8xx_ohci->usb11_phy)) { error = PTR_ERR(da8xx_ohci->usb11_phy); if (error != -EPROBE_DEFER) dev_err(dev, "Failed to get phy.\n"); goto err; } da8xx_ohci->vbus_reg = devm_regulator_get_optional(dev, "vbus"); if (IS_ERR(da8xx_ohci->vbus_reg)) { error = PTR_ERR(da8xx_ohci->vbus_reg); if (error == -ENODEV) { da8xx_ohci->vbus_reg = NULL; } else if (error == -EPROBE_DEFER) { goto err; } else { dev_err(dev, "Failed to get regulator\n"); goto err; } } da8xx_ohci->oc_gpio = devm_gpiod_get_optional(dev, "oc", GPIOD_IN); if (IS_ERR(da8xx_ohci->oc_gpio)) { error = PTR_ERR(da8xx_ohci->oc_gpio); goto err; } if (da8xx_ohci->oc_gpio) { oc_irq = gpiod_to_irq(da8xx_ohci->oc_gpio); if (oc_irq < 0) { error = oc_irq; goto err; } error = devm_request_threaded_irq(dev, oc_irq, NULL, ohci_da8xx_oc_thread, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "OHCI over-current indicator", da8xx_ohci); if (error) goto err; } mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); hcd->regs = devm_ioremap_resource(dev, mem); if (IS_ERR(hcd->regs)) { error = PTR_ERR(hcd->regs); goto err; } hcd->rsrc_start = mem->start; hcd->rsrc_len = resource_size(mem); hcd_irq = platform_get_irq(pdev, 0); if (hcd_irq < 0) { error = -ENODEV; goto err; } error = usb_add_hcd(hcd, hcd_irq, 0); if (error) goto err; device_wakeup_enable(hcd->self.controller); error = ohci_da8xx_register_notify(hcd); if (error) goto err_remove_hcd; return 0; err_remove_hcd: usb_remove_hcd(hcd); err: usb_put_hcd(hcd); return error; } static int ohci_da8xx_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); usb_remove_hcd(hcd); usb_put_hcd(hcd); return 0; } #ifdef CONFIG_PM static int ohci_da8xx_suspend(struct platform_device *pdev, pm_message_t message) { struct usb_hcd *hcd = platform_get_drvdata(pdev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); bool do_wakeup = device_may_wakeup(&pdev->dev); int ret; if (time_before(jiffies, ohci->next_statechange)) msleep(5); ohci->next_statechange = jiffies; ret = ohci_suspend(hcd, do_wakeup); if (ret) return ret; ohci_da8xx_disable(hcd); hcd->state = HC_STATE_SUSPENDED; return ret; } static int ohci_da8xx_resume(struct platform_device *dev) { struct usb_hcd *hcd = platform_get_drvdata(dev); struct ohci_hcd *ohci = hcd_to_ohci(hcd); int ret; if (time_before(jiffies, ohci->next_statechange)) msleep(5); ohci->next_statechange = jiffies; ret = ohci_da8xx_enable(hcd); if (ret) return ret; ohci_resume(hcd, false); return 0; } #endif static const struct ohci_driver_overrides da8xx_overrides __initconst = { .reset = ohci_da8xx_reset, .extra_priv_size = sizeof(struct da8xx_ohci_hcd), }; /* * Driver definition to register with platform structure. */ static struct platform_driver ohci_hcd_da8xx_driver = { .probe = ohci_da8xx_probe, .remove = ohci_da8xx_remove, .shutdown = usb_hcd_platform_shutdown, #ifdef CONFIG_PM .suspend = ohci_da8xx_suspend, .resume = ohci_da8xx_resume, #endif .driver = { .name = DRV_NAME, .of_match_table = of_match_ptr(da8xx_ohci_ids), }, }; static int __init ohci_da8xx_init(void) { if (usb_disabled()) return -ENODEV; ohci_init_driver(&ohci_da8xx_hc_driver, &da8xx_overrides); /* * The Davinci da8xx HW has some unusual quirks, which require * da8xx-specific workarounds. We override certain hc_driver * functions here to achieve that. We explicitly do not enhance * ohci_driver_overrides to allow this more easily, since this * is an unusual case, and we don't want to encourage others to * override these functions by making it too easy. */ orig_ohci_hub_control = ohci_da8xx_hc_driver.hub_control; orig_ohci_hub_status_data = ohci_da8xx_hc_driver.hub_status_data; ohci_da8xx_hc_driver.hub_status_data = ohci_da8xx_hub_status_data; ohci_da8xx_hc_driver.hub_control = ohci_da8xx_hub_control; return platform_driver_register(&ohci_hcd_da8xx_driver); } module_init(ohci_da8xx_init); static void __exit ohci_da8xx_exit(void) { platform_driver_unregister(&ohci_hcd_da8xx_driver); } module_exit(ohci_da8xx_exit); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DRV_NAME); |