1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * core.c - DesignWare USB3 DRD Controller Core file 4 * 5 * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com 6 * 7 * Authors: Felipe Balbi <balbi@ti.com>, 8 * Sebastian Andrzej Siewior <bigeasy@linutronix.de> 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/version.h> 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/slab.h> 16 #include <linux/spinlock.h> 17 #include <linux/platform_device.h> 18 #include <linux/pm_runtime.h> 19 #include <linux/interrupt.h> 20 #include <linux/ioport.h> 21 #include <linux/io.h> 22 #include <linux/list.h> 23 #include <linux/delay.h> 24 #include <linux/dma-mapping.h> 25 #include <linux/of.h> 26 #include <linux/of_graph.h> 27 #include <linux/acpi.h> 28 #include <linux/pinctrl/consumer.h> 29 #include <linux/reset.h> 30 #include <linux/bitfield.h> 31 32 #include <linux/usb/ch9.h> 33 #include <linux/usb/gadget.h> 34 #include <linux/usb/of.h> 35 #include <linux/usb/otg.h> 36 37 #include "core.h" 38 #include "gadget.h" 39 #include "io.h" 40 41 #include "debug.h" 42 43 #define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */ 44 45 /** 46 * dwc3_get_dr_mode - Validates and sets dr_mode 47 * @dwc: pointer to our context structure 48 */ 49 static int dwc3_get_dr_mode(struct dwc3 *dwc) 50 { 51 enum usb_dr_mode mode; 52 struct device *dev = dwc->dev; 53 unsigned int hw_mode; 54 55 if (dwc->dr_mode == USB_DR_MODE_UNKNOWN) 56 dwc->dr_mode = USB_DR_MODE_OTG; 57 58 mode = dwc->dr_mode; 59 hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); 60 61 switch (hw_mode) { 62 case DWC3_GHWPARAMS0_MODE_GADGET: 63 if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) { 64 dev_err(dev, 65 "Controller does not support host mode.\n"); 66 return -EINVAL; 67 } 68 mode = USB_DR_MODE_PERIPHERAL; 69 break; 70 case DWC3_GHWPARAMS0_MODE_HOST: 71 if (IS_ENABLED(CONFIG_USB_DWC3_GADGET)) { 72 dev_err(dev, 73 "Controller does not support device mode.\n"); 74 return -EINVAL; 75 } 76 mode = USB_DR_MODE_HOST; 77 break; 78 default: 79 if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) 80 mode = USB_DR_MODE_HOST; 81 else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET)) 82 mode = USB_DR_MODE_PERIPHERAL; 83 84 /* 85 * DWC_usb31 and DWC_usb3 v3.30a and higher do not support OTG 86 * mode. If the controller supports DRD but the dr_mode is not 87 * specified or set to OTG, then set the mode to peripheral. 88 */ 89 if (mode == USB_DR_MODE_OTG && !dwc->edev && 90 (!IS_ENABLED(CONFIG_USB_ROLE_SWITCH) || 91 !device_property_read_bool(dwc->dev, "usb-role-switch")) && 92 !DWC3_VER_IS_PRIOR(DWC3, 330A)) 93 mode = USB_DR_MODE_PERIPHERAL; 94 } 95 96 if (mode != dwc->dr_mode) { 97 dev_warn(dev, 98 "Configuration mismatch. dr_mode forced to %s\n", 99 mode == USB_DR_MODE_HOST ? "host" : "gadget"); 100 101 dwc->dr_mode = mode; 102 } 103 104 return 0; 105 } 106 107 void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode) 108 { 109 u32 reg; 110 111 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 112 reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG)); 113 reg |= DWC3_GCTL_PRTCAPDIR(mode); 114 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 115 116 dwc->current_dr_role = mode; 117 } 118 119 static void __dwc3_set_mode(struct work_struct *work) 120 { 121 struct dwc3 *dwc = work_to_dwc(work); 122 unsigned long flags; 123 int ret; 124 u32 reg; 125 u32 desired_dr_role; 126 127 mutex_lock(&dwc->mutex); 128 spin_lock_irqsave(&dwc->lock, flags); 129 desired_dr_role = dwc->desired_dr_role; 130 spin_unlock_irqrestore(&dwc->lock, flags); 131 132 pm_runtime_get_sync(dwc->dev); 133 134 if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG) 135 dwc3_otg_update(dwc, 0); 136 137 if (!desired_dr_role) 138 goto out; 139 140 if (desired_dr_role == dwc->current_dr_role) 141 goto out; 142 143 if (desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev) 144 goto out; 145 146 switch (dwc->current_dr_role) { 147 case DWC3_GCTL_PRTCAP_HOST: 148 dwc3_host_exit(dwc); 149 break; 150 case DWC3_GCTL_PRTCAP_DEVICE: 151 dwc3_gadget_exit(dwc); 152 dwc3_event_buffers_cleanup(dwc); 153 break; 154 case DWC3_GCTL_PRTCAP_OTG: 155 dwc3_otg_exit(dwc); 156 spin_lock_irqsave(&dwc->lock, flags); 157 dwc->desired_otg_role = DWC3_OTG_ROLE_IDLE; 158 spin_unlock_irqrestore(&dwc->lock, flags); 159 dwc3_otg_update(dwc, 1); 160 break; 161 default: 162 break; 163 } 164 165 /* 166 * When current_dr_role is not set, there's no role switching. 167 * Only perform GCTL.CoreSoftReset when there's DRD role switching. 168 */ 169 if (dwc->current_dr_role && ((DWC3_IP_IS(DWC3) || 170 DWC3_VER_IS_PRIOR(DWC31, 190A)) && 171 desired_dr_role != DWC3_GCTL_PRTCAP_OTG)) { 172 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 173 reg |= DWC3_GCTL_CORESOFTRESET; 174 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 175 176 /* 177 * Wait for internal clocks to synchronized. DWC_usb31 and 178 * DWC_usb32 may need at least 50ms (less for DWC_usb3). To 179 * keep it consistent across different IPs, let's wait up to 180 * 100ms before clearing GCTL.CORESOFTRESET. 181 */ 182 msleep(100); 183 184 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 185 reg &= ~DWC3_GCTL_CORESOFTRESET; 186 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 187 } 188 189 spin_lock_irqsave(&dwc->lock, flags); 190 191 dwc3_set_prtcap(dwc, desired_dr_role); 192 193 spin_unlock_irqrestore(&dwc->lock, flags); 194 195 switch (desired_dr_role) { 196 case DWC3_GCTL_PRTCAP_HOST: 197 ret = dwc3_host_init(dwc); 198 if (ret) { 199 dev_err(dwc->dev, "failed to initialize host\n"); 200 } else { 201 if (dwc->usb2_phy) 202 otg_set_vbus(dwc->usb2_phy->otg, true); 203 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST); 204 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST); 205 if (dwc->dis_split_quirk) { 206 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3); 207 reg |= DWC3_GUCTL3_SPLITDISABLE; 208 dwc3_writel(dwc->regs, DWC3_GUCTL3, reg); 209 } 210 } 211 break; 212 case DWC3_GCTL_PRTCAP_DEVICE: 213 dwc3_core_soft_reset(dwc); 214 215 dwc3_event_buffers_setup(dwc); 216 217 if (dwc->usb2_phy) 218 otg_set_vbus(dwc->usb2_phy->otg, false); 219 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE); 220 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE); 221 222 ret = dwc3_gadget_init(dwc); 223 if (ret) 224 dev_err(dwc->dev, "failed to initialize peripheral\n"); 225 break; 226 case DWC3_GCTL_PRTCAP_OTG: 227 dwc3_otg_init(dwc); 228 dwc3_otg_update(dwc, 0); 229 break; 230 default: 231 break; 232 } 233 234 out: 235 pm_runtime_mark_last_busy(dwc->dev); 236 pm_runtime_put_autosuspend(dwc->dev); 237 mutex_unlock(&dwc->mutex); 238 } 239 240 void dwc3_set_mode(struct dwc3 *dwc, u32 mode) 241 { 242 unsigned long flags; 243 244 if (dwc->dr_mode != USB_DR_MODE_OTG) 245 return; 246 247 spin_lock_irqsave(&dwc->lock, flags); 248 dwc->desired_dr_role = mode; 249 spin_unlock_irqrestore(&dwc->lock, flags); 250 251 queue_work(system_freezable_wq, &dwc->drd_work); 252 } 253 254 u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type) 255 { 256 struct dwc3 *dwc = dep->dwc; 257 u32 reg; 258 259 dwc3_writel(dwc->regs, DWC3_GDBGFIFOSPACE, 260 DWC3_GDBGFIFOSPACE_NUM(dep->number) | 261 DWC3_GDBGFIFOSPACE_TYPE(type)); 262 263 reg = dwc3_readl(dwc->regs, DWC3_GDBGFIFOSPACE); 264 265 return DWC3_GDBGFIFOSPACE_SPACE_AVAILABLE(reg); 266 } 267 268 /** 269 * dwc3_core_soft_reset - Issues core soft reset and PHY reset 270 * @dwc: pointer to our context structure 271 */ 272 int dwc3_core_soft_reset(struct dwc3 *dwc) 273 { 274 u32 reg; 275 int retries = 1000; 276 277 /* 278 * We're resetting only the device side because, if we're in host mode, 279 * XHCI driver will reset the host block. If dwc3 was configured for 280 * host-only mode, then we can return early. 281 */ 282 if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) 283 return 0; 284 285 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 286 reg |= DWC3_DCTL_CSFTRST; 287 reg &= ~DWC3_DCTL_RUN_STOP; 288 dwc3_gadget_dctl_write_safe(dwc, reg); 289 290 /* 291 * For DWC_usb31 controller 1.90a and later, the DCTL.CSFRST bit 292 * is cleared only after all the clocks are synchronized. This can 293 * take a little more than 50ms. Set the polling rate at 20ms 294 * for 10 times instead. 295 */ 296 if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32)) 297 retries = 10; 298 299 do { 300 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 301 if (!(reg & DWC3_DCTL_CSFTRST)) 302 goto done; 303 304 if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32)) 305 msleep(20); 306 else 307 udelay(1); 308 } while (--retries); 309 310 dev_warn(dwc->dev, "DWC3 controller soft reset failed.\n"); 311 return -ETIMEDOUT; 312 313 done: 314 /* 315 * For DWC_usb31 controller 1.80a and prior, once DCTL.CSFRST bit 316 * is cleared, we must wait at least 50ms before accessing the PHY 317 * domain (synchronization delay). 318 */ 319 if (DWC3_VER_IS_WITHIN(DWC31, ANY, 180A)) 320 msleep(50); 321 322 return 0; 323 } 324 325 /* 326 * dwc3_frame_length_adjustment - Adjusts frame length if required 327 * @dwc3: Pointer to our controller context structure 328 */ 329 static void dwc3_frame_length_adjustment(struct dwc3 *dwc) 330 { 331 u32 reg; 332 u32 dft; 333 334 if (DWC3_VER_IS_PRIOR(DWC3, 250A)) 335 return; 336 337 if (dwc->fladj == 0) 338 return; 339 340 reg = dwc3_readl(dwc->regs, DWC3_GFLADJ); 341 dft = reg & DWC3_GFLADJ_30MHZ_MASK; 342 if (dft != dwc->fladj) { 343 reg &= ~DWC3_GFLADJ_30MHZ_MASK; 344 reg |= DWC3_GFLADJ_30MHZ_SDBND_SEL | dwc->fladj; 345 dwc3_writel(dwc->regs, DWC3_GFLADJ, reg); 346 } 347 } 348 349 /** 350 * dwc3_ref_clk_period - Reference clock period configuration 351 * Default reference clock period depends on hardware 352 * configuration. For systems with reference clock that differs 353 * from the default, this will set clock period in DWC3_GUCTL 354 * register. 355 * @dwc: Pointer to our controller context structure 356 */ 357 static void dwc3_ref_clk_period(struct dwc3 *dwc) 358 { 359 unsigned long period; 360 unsigned long fladj; 361 unsigned long decr; 362 unsigned long rate; 363 u32 reg; 364 365 if (dwc->ref_clk) { 366 rate = clk_get_rate(dwc->ref_clk); 367 if (!rate) 368 return; 369 period = NSEC_PER_SEC / rate; 370 } else if (dwc->ref_clk_per) { 371 period = dwc->ref_clk_per; 372 rate = NSEC_PER_SEC / period; 373 } else { 374 return; 375 } 376 377 reg = dwc3_readl(dwc->regs, DWC3_GUCTL); 378 reg &= ~DWC3_GUCTL_REFCLKPER_MASK; 379 reg |= FIELD_PREP(DWC3_GUCTL_REFCLKPER_MASK, period); 380 dwc3_writel(dwc->regs, DWC3_GUCTL, reg); 381 382 if (DWC3_VER_IS_PRIOR(DWC3, 250A)) 383 return; 384 385 /* 386 * The calculation below is 387 * 388 * 125000 * (NSEC_PER_SEC / (rate * period) - 1) 389 * 390 * but rearranged for fixed-point arithmetic. The division must be 391 * 64-bit because 125000 * NSEC_PER_SEC doesn't fit in 32 bits (and 392 * neither does rate * period). 393 * 394 * Note that rate * period ~= NSEC_PER_SECOND, minus the number of 395 * nanoseconds of error caused by the truncation which happened during 396 * the division when calculating rate or period (whichever one was 397 * derived from the other). We first calculate the relative error, then 398 * scale it to units of 8 ppm. 399 */ 400 fladj = div64_u64(125000ULL * NSEC_PER_SEC, (u64)rate * period); 401 fladj -= 125000; 402 403 /* 404 * The documented 240MHz constant is scaled by 2 to get PLS1 as well. 405 */ 406 decr = 480000000 / rate; 407 408 reg = dwc3_readl(dwc->regs, DWC3_GFLADJ); 409 reg &= ~DWC3_GFLADJ_REFCLK_FLADJ_MASK 410 & ~DWC3_GFLADJ_240MHZDECR 411 & ~DWC3_GFLADJ_240MHZDECR_PLS1; 412 reg |= FIELD_PREP(DWC3_GFLADJ_REFCLK_FLADJ_MASK, fladj) 413 | FIELD_PREP(DWC3_GFLADJ_240MHZDECR, decr >> 1) 414 | FIELD_PREP(DWC3_GFLADJ_240MHZDECR_PLS1, decr & 1); 415 416 if (dwc->gfladj_refclk_lpm_sel) 417 reg |= DWC3_GFLADJ_REFCLK_LPM_SEL; 418 419 dwc3_writel(dwc->regs, DWC3_GFLADJ, reg); 420 } 421 422 /** 423 * dwc3_free_one_event_buffer - Frees one event buffer 424 * @dwc: Pointer to our controller context structure 425 * @evt: Pointer to event buffer to be freed 426 */ 427 static void dwc3_free_one_event_buffer(struct dwc3 *dwc, 428 struct dwc3_event_buffer *evt) 429 { 430 dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma); 431 } 432 433 /** 434 * dwc3_alloc_one_event_buffer - Allocates one event buffer structure 435 * @dwc: Pointer to our controller context structure 436 * @length: size of the event buffer 437 * 438 * Returns a pointer to the allocated event buffer structure on success 439 * otherwise ERR_PTR(errno). 440 */ 441 static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc, 442 unsigned int length) 443 { 444 struct dwc3_event_buffer *evt; 445 446 evt = devm_kzalloc(dwc->dev, sizeof(*evt), GFP_KERNEL); 447 if (!evt) 448 return ERR_PTR(-ENOMEM); 449 450 evt->dwc = dwc; 451 evt->length = length; 452 evt->cache = devm_kzalloc(dwc->dev, length, GFP_KERNEL); 453 if (!evt->cache) 454 return ERR_PTR(-ENOMEM); 455 456 evt->buf = dma_alloc_coherent(dwc->sysdev, length, 457 &evt->dma, GFP_KERNEL); 458 if (!evt->buf) 459 return ERR_PTR(-ENOMEM); 460 461 return evt; 462 } 463 464 /** 465 * dwc3_free_event_buffers - frees all allocated event buffers 466 * @dwc: Pointer to our controller context structure 467 */ 468 static void dwc3_free_event_buffers(struct dwc3 *dwc) 469 { 470 struct dwc3_event_buffer *evt; 471 472 evt = dwc->ev_buf; 473 if (evt) 474 dwc3_free_one_event_buffer(dwc, evt); 475 } 476 477 /** 478 * dwc3_alloc_event_buffers - Allocates @num event buffers of size @length 479 * @dwc: pointer to our controller context structure 480 * @length: size of event buffer 481 * 482 * Returns 0 on success otherwise negative errno. In the error case, dwc 483 * may contain some buffers allocated but not all which were requested. 484 */ 485 static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned int length) 486 { 487 struct dwc3_event_buffer *evt; 488 489 evt = dwc3_alloc_one_event_buffer(dwc, length); 490 if (IS_ERR(evt)) { 491 dev_err(dwc->dev, "can't allocate event buffer\n"); 492 return PTR_ERR(evt); 493 } 494 dwc->ev_buf = evt; 495 496 return 0; 497 } 498 499 /** 500 * dwc3_event_buffers_setup - setup our allocated event buffers 501 * @dwc: pointer to our controller context structure 502 * 503 * Returns 0 on success otherwise negative errno. 504 */ 505 int dwc3_event_buffers_setup(struct dwc3 *dwc) 506 { 507 struct dwc3_event_buffer *evt; 508 509 evt = dwc->ev_buf; 510 evt->lpos = 0; 511 dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), 512 lower_32_bits(evt->dma)); 513 dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0), 514 upper_32_bits(evt->dma)); 515 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), 516 DWC3_GEVNTSIZ_SIZE(evt->length)); 517 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0); 518 519 return 0; 520 } 521 522 void dwc3_event_buffers_cleanup(struct dwc3 *dwc) 523 { 524 struct dwc3_event_buffer *evt; 525 526 evt = dwc->ev_buf; 527 528 evt->lpos = 0; 529 530 dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), 0); 531 dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0), 0); 532 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), DWC3_GEVNTSIZ_INTMASK 533 | DWC3_GEVNTSIZ_SIZE(0)); 534 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0); 535 } 536 537 static void dwc3_core_num_eps(struct dwc3 *dwc) 538 { 539 struct dwc3_hwparams *parms = &dwc->hwparams; 540 541 dwc->num_eps = DWC3_NUM_EPS(parms); 542 } 543 544 static void dwc3_cache_hwparams(struct dwc3 *dwc) 545 { 546 struct dwc3_hwparams *parms = &dwc->hwparams; 547 548 parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0); 549 parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1); 550 parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2); 551 parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3); 552 parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4); 553 parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5); 554 parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6); 555 parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7); 556 parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8); 557 558 if (DWC3_IP_IS(DWC32)) 559 parms->hwparams9 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS9); 560 } 561 562 static int dwc3_core_ulpi_init(struct dwc3 *dwc) 563 { 564 int intf; 565 int ret = 0; 566 567 intf = DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3); 568 569 if (intf == DWC3_GHWPARAMS3_HSPHY_IFC_ULPI || 570 (intf == DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI && 571 dwc->hsphy_interface && 572 !strncmp(dwc->hsphy_interface, "ulpi", 4))) 573 ret = dwc3_ulpi_init(dwc); 574 575 return ret; 576 } 577 578 /** 579 * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core 580 * @dwc: Pointer to our controller context structure 581 * 582 * Returns 0 on success. The USB PHY interfaces are configured but not 583 * initialized. The PHY interfaces and the PHYs get initialized together with 584 * the core in dwc3_core_init. 585 */ 586 static int dwc3_phy_setup(struct dwc3 *dwc) 587 { 588 unsigned int hw_mode; 589 u32 reg; 590 591 hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); 592 593 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)); 594 595 /* 596 * Make sure UX_EXIT_PX is cleared as that causes issues with some 597 * PHYs. Also, this bit is not supposed to be used in normal operation. 598 */ 599 reg &= ~DWC3_GUSB3PIPECTL_UX_EXIT_PX; 600 601 /* 602 * Above 1.94a, it is recommended to set DWC3_GUSB3PIPECTL_SUSPHY 603 * to '0' during coreConsultant configuration. So default value 604 * will be '0' when the core is reset. Application needs to set it 605 * to '1' after the core initialization is completed. 606 */ 607 if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) 608 reg |= DWC3_GUSB3PIPECTL_SUSPHY; 609 610 /* 611 * For DRD controllers, GUSB3PIPECTL.SUSPENDENABLE must be cleared after 612 * power-on reset, and it can be set after core initialization, which is 613 * after device soft-reset during initialization. 614 */ 615 if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD) 616 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY; 617 618 if (dwc->u2ss_inp3_quirk) 619 reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK; 620 621 if (dwc->dis_rxdet_inp3_quirk) 622 reg |= DWC3_GUSB3PIPECTL_DISRXDETINP3; 623 624 if (dwc->req_p1p2p3_quirk) 625 reg |= DWC3_GUSB3PIPECTL_REQP1P2P3; 626 627 if (dwc->del_p1p2p3_quirk) 628 reg |= DWC3_GUSB3PIPECTL_DEP1P2P3_EN; 629 630 if (dwc->del_phy_power_chg_quirk) 631 reg |= DWC3_GUSB3PIPECTL_DEPOCHANGE; 632 633 if (dwc->lfps_filter_quirk) 634 reg |= DWC3_GUSB3PIPECTL_LFPSFILT; 635 636 if (dwc->rx_detect_poll_quirk) 637 reg |= DWC3_GUSB3PIPECTL_RX_DETOPOLL; 638 639 if (dwc->tx_de_emphasis_quirk) 640 reg |= DWC3_GUSB3PIPECTL_TX_DEEPH(dwc->tx_de_emphasis); 641 642 if (dwc->dis_u3_susphy_quirk) 643 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY; 644 645 if (dwc->dis_del_phy_power_chg_quirk) 646 reg &= ~DWC3_GUSB3PIPECTL_DEPOCHANGE; 647 648 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg); 649 650 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 651 652 /* Select the HS PHY interface */ 653 switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) { 654 case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI: 655 if (dwc->hsphy_interface && 656 !strncmp(dwc->hsphy_interface, "utmi", 4)) { 657 reg &= ~DWC3_GUSB2PHYCFG_ULPI_UTMI; 658 break; 659 } else if (dwc->hsphy_interface && 660 !strncmp(dwc->hsphy_interface, "ulpi", 4)) { 661 reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI; 662 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 663 } else { 664 /* Relying on default value. */ 665 if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI)) 666 break; 667 } 668 fallthrough; 669 case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI: 670 default: 671 break; 672 } 673 674 switch (dwc->hsphy_mode) { 675 case USBPHY_INTERFACE_MODE_UTMI: 676 reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK | 677 DWC3_GUSB2PHYCFG_USBTRDTIM_MASK); 678 reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_8_BIT) | 679 DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_8_BIT); 680 break; 681 case USBPHY_INTERFACE_MODE_UTMIW: 682 reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK | 683 DWC3_GUSB2PHYCFG_USBTRDTIM_MASK); 684 reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_16_BIT) | 685 DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_16_BIT); 686 break; 687 default: 688 break; 689 } 690 691 /* 692 * Above 1.94a, it is recommended to set DWC3_GUSB2PHYCFG_SUSPHY to 693 * '0' during coreConsultant configuration. So default value will 694 * be '0' when the core is reset. Application needs to set it to 695 * '1' after the core initialization is completed. 696 */ 697 if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) 698 reg |= DWC3_GUSB2PHYCFG_SUSPHY; 699 700 /* 701 * For DRD controllers, GUSB2PHYCFG.SUSPHY must be cleared after 702 * power-on reset, and it can be set after core initialization, which is 703 * after device soft-reset during initialization. 704 */ 705 if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD) 706 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; 707 708 if (dwc->dis_u2_susphy_quirk) 709 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; 710 711 if (dwc->dis_enblslpm_quirk) 712 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM; 713 else 714 reg |= DWC3_GUSB2PHYCFG_ENBLSLPM; 715 716 if (dwc->dis_u2_freeclk_exists_quirk || dwc->gfladj_refclk_lpm_sel) 717 reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS; 718 719 /* 720 * Some ULPI USB PHY does not support internal VBUS supply, to drive 721 * the CPEN pin requires the configuration of the ULPI DRVVBUSEXTERNAL 722 * bit of OTG_CTRL register. Controller configures the USB2 PHY 723 * ULPIEXTVBUSDRV bit[17] of the GUSB2PHYCFG register to drive vBus 724 * with an external supply. 725 */ 726 if (dwc->ulpi_ext_vbus_drv) 727 reg |= DWC3_GUSB2PHYCFG_ULPIEXTVBUSDRV; 728 729 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 730 731 return 0; 732 } 733 734 static int dwc3_phy_init(struct dwc3 *dwc) 735 { 736 int ret; 737 738 usb_phy_init(dwc->usb2_phy); 739 usb_phy_init(dwc->usb3_phy); 740 741 ret = phy_init(dwc->usb2_generic_phy); 742 if (ret < 0) 743 goto err_shutdown_usb3_phy; 744 745 ret = phy_init(dwc->usb3_generic_phy); 746 if (ret < 0) 747 goto err_exit_usb2_phy; 748 749 return 0; 750 751 err_exit_usb2_phy: 752 phy_exit(dwc->usb2_generic_phy); 753 err_shutdown_usb3_phy: 754 usb_phy_shutdown(dwc->usb3_phy); 755 usb_phy_shutdown(dwc->usb2_phy); 756 757 return ret; 758 } 759 760 static void dwc3_phy_exit(struct dwc3 *dwc) 761 { 762 phy_exit(dwc->usb3_generic_phy); 763 phy_exit(dwc->usb2_generic_phy); 764 765 usb_phy_shutdown(dwc->usb3_phy); 766 usb_phy_shutdown(dwc->usb2_phy); 767 } 768 769 static int dwc3_phy_power_on(struct dwc3 *dwc) 770 { 771 int ret; 772 773 usb_phy_set_suspend(dwc->usb2_phy, 0); 774 usb_phy_set_suspend(dwc->usb3_phy, 0); 775 776 ret = phy_power_on(dwc->usb2_generic_phy); 777 if (ret < 0) 778 goto err_suspend_usb3_phy; 779 780 ret = phy_power_on(dwc->usb3_generic_phy); 781 if (ret < 0) 782 goto err_power_off_usb2_phy; 783 784 return 0; 785 786 err_power_off_usb2_phy: 787 phy_power_off(dwc->usb2_generic_phy); 788 err_suspend_usb3_phy: 789 usb_phy_set_suspend(dwc->usb3_phy, 1); 790 usb_phy_set_suspend(dwc->usb2_phy, 1); 791 792 return ret; 793 } 794 795 static void dwc3_phy_power_off(struct dwc3 *dwc) 796 { 797 phy_power_off(dwc->usb3_generic_phy); 798 phy_power_off(dwc->usb2_generic_phy); 799 800 usb_phy_set_suspend(dwc->usb3_phy, 1); 801 usb_phy_set_suspend(dwc->usb2_phy, 1); 802 } 803 804 static int dwc3_clk_enable(struct dwc3 *dwc) 805 { 806 int ret; 807 808 ret = clk_prepare_enable(dwc->bus_clk); 809 if (ret) 810 return ret; 811 812 ret = clk_prepare_enable(dwc->ref_clk); 813 if (ret) 814 goto disable_bus_clk; 815 816 ret = clk_prepare_enable(dwc->susp_clk); 817 if (ret) 818 goto disable_ref_clk; 819 820 return 0; 821 822 disable_ref_clk: 823 clk_disable_unprepare(dwc->ref_clk); 824 disable_bus_clk: 825 clk_disable_unprepare(dwc->bus_clk); 826 return ret; 827 } 828 829 static void dwc3_clk_disable(struct dwc3 *dwc) 830 { 831 clk_disable_unprepare(dwc->susp_clk); 832 clk_disable_unprepare(dwc->ref_clk); 833 clk_disable_unprepare(dwc->bus_clk); 834 } 835 836 static void dwc3_core_exit(struct dwc3 *dwc) 837 { 838 dwc3_event_buffers_cleanup(dwc); 839 dwc3_phy_power_off(dwc); 840 dwc3_phy_exit(dwc); 841 dwc3_clk_disable(dwc); 842 reset_control_assert(dwc->reset); 843 } 844 845 static bool dwc3_core_is_valid(struct dwc3 *dwc) 846 { 847 u32 reg; 848 849 reg = dwc3_readl(dwc->regs, DWC3_GSNPSID); 850 dwc->ip = DWC3_GSNPS_ID(reg); 851 852 /* This should read as U3 followed by revision number */ 853 if (DWC3_IP_IS(DWC3)) { 854 dwc->revision = reg; 855 } else if (DWC3_IP_IS(DWC31) || DWC3_IP_IS(DWC32)) { 856 dwc->revision = dwc3_readl(dwc->regs, DWC3_VER_NUMBER); 857 dwc->version_type = dwc3_readl(dwc->regs, DWC3_VER_TYPE); 858 } else { 859 return false; 860 } 861 862 return true; 863 } 864 865 static void dwc3_core_setup_global_control(struct dwc3 *dwc) 866 { 867 u32 reg; 868 869 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 870 reg &= ~DWC3_GCTL_SCALEDOWN_MASK; 871 872 switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) { 873 case DWC3_GHWPARAMS1_EN_PWROPT_CLK: 874 /** 875 * WORKAROUND: DWC3 revisions between 2.10a and 2.50a have an 876 * issue which would cause xHCI compliance tests to fail. 877 * 878 * Because of that we cannot enable clock gating on such 879 * configurations. 880 * 881 * Refers to: 882 * 883 * STAR#9000588375: Clock Gating, SOF Issues when ref_clk-Based 884 * SOF/ITP Mode Used 885 */ 886 if ((dwc->dr_mode == USB_DR_MODE_HOST || 887 dwc->dr_mode == USB_DR_MODE_OTG) && 888 DWC3_VER_IS_WITHIN(DWC3, 210A, 250A)) 889 reg |= DWC3_GCTL_DSBLCLKGTNG | DWC3_GCTL_SOFITPSYNC; 890 else 891 reg &= ~DWC3_GCTL_DSBLCLKGTNG; 892 break; 893 case DWC3_GHWPARAMS1_EN_PWROPT_HIB: 894 /* 895 * REVISIT Enabling this bit so that host-mode hibernation 896 * will work. Device-mode hibernation is not yet implemented. 897 */ 898 reg |= DWC3_GCTL_GBLHIBERNATIONEN; 899 break; 900 default: 901 /* nothing */ 902 break; 903 } 904 905 /* check if current dwc3 is on simulation board */ 906 if (dwc->hwparams.hwparams6 & DWC3_GHWPARAMS6_EN_FPGA) { 907 dev_info(dwc->dev, "Running with FPGA optimizations\n"); 908 dwc->is_fpga = true; 909 } 910 911 WARN_ONCE(dwc->disable_scramble_quirk && !dwc->is_fpga, 912 "disable_scramble cannot be used on non-FPGA builds\n"); 913 914 if (dwc->disable_scramble_quirk && dwc->is_fpga) 915 reg |= DWC3_GCTL_DISSCRAMBLE; 916 else 917 reg &= ~DWC3_GCTL_DISSCRAMBLE; 918 919 if (dwc->u2exit_lfps_quirk) 920 reg |= DWC3_GCTL_U2EXIT_LFPS; 921 922 /* 923 * WORKAROUND: DWC3 revisions <1.90a have a bug 924 * where the device can fail to connect at SuperSpeed 925 * and falls back to high-speed mode which causes 926 * the device to enter a Connect/Disconnect loop 927 */ 928 if (DWC3_VER_IS_PRIOR(DWC3, 190A)) 929 reg |= DWC3_GCTL_U2RSTECN; 930 931 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 932 } 933 934 static int dwc3_core_get_phy(struct dwc3 *dwc); 935 static int dwc3_core_ulpi_init(struct dwc3 *dwc); 936 937 /* set global incr burst type configuration registers */ 938 static void dwc3_set_incr_burst_type(struct dwc3 *dwc) 939 { 940 struct device *dev = dwc->dev; 941 /* incrx_mode : for INCR burst type. */ 942 bool incrx_mode; 943 /* incrx_size : for size of INCRX burst. */ 944 u32 incrx_size; 945 u32 *vals; 946 u32 cfg; 947 int ntype; 948 int ret; 949 int i; 950 951 cfg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0); 952 953 /* 954 * Handle property "snps,incr-burst-type-adjustment". 955 * Get the number of value from this property: 956 * result <= 0, means this property is not supported. 957 * result = 1, means INCRx burst mode supported. 958 * result > 1, means undefined length burst mode supported. 959 */ 960 ntype = device_property_count_u32(dev, "snps,incr-burst-type-adjustment"); 961 if (ntype <= 0) 962 return; 963 964 vals = kcalloc(ntype, sizeof(u32), GFP_KERNEL); 965 if (!vals) 966 return; 967 968 /* Get INCR burst type, and parse it */ 969 ret = device_property_read_u32_array(dev, 970 "snps,incr-burst-type-adjustment", vals, ntype); 971 if (ret) { 972 kfree(vals); 973 dev_err(dev, "Error to get property\n"); 974 return; 975 } 976 977 incrx_size = *vals; 978 979 if (ntype > 1) { 980 /* INCRX (undefined length) burst mode */ 981 incrx_mode = INCRX_UNDEF_LENGTH_BURST_MODE; 982 for (i = 1; i < ntype; i++) { 983 if (vals[i] > incrx_size) 984 incrx_size = vals[i]; 985 } 986 } else { 987 /* INCRX burst mode */ 988 incrx_mode = INCRX_BURST_MODE; 989 } 990 991 kfree(vals); 992 993 /* Enable Undefined Length INCR Burst and Enable INCRx Burst */ 994 cfg &= ~DWC3_GSBUSCFG0_INCRBRST_MASK; 995 if (incrx_mode) 996 cfg |= DWC3_GSBUSCFG0_INCRBRSTENA; 997 switch (incrx_size) { 998 case 256: 999 cfg |= DWC3_GSBUSCFG0_INCR256BRSTENA; 1000 break; 1001 case 128: 1002 cfg |= DWC3_GSBUSCFG0_INCR128BRSTENA; 1003 break; 1004 case 64: 1005 cfg |= DWC3_GSBUSCFG0_INCR64BRSTENA; 1006 break; 1007 case 32: 1008 cfg |= DWC3_GSBUSCFG0_INCR32BRSTENA; 1009 break; 1010 case 16: 1011 cfg |= DWC3_GSBUSCFG0_INCR16BRSTENA; 1012 break; 1013 case 8: 1014 cfg |= DWC3_GSBUSCFG0_INCR8BRSTENA; 1015 break; 1016 case 4: 1017 cfg |= DWC3_GSBUSCFG0_INCR4BRSTENA; 1018 break; 1019 case 1: 1020 break; 1021 default: 1022 dev_err(dev, "Invalid property\n"); 1023 break; 1024 } 1025 1026 dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, cfg); 1027 } 1028 1029 static void dwc3_set_power_down_clk_scale(struct dwc3 *dwc) 1030 { 1031 u32 scale; 1032 u32 reg; 1033 1034 if (!dwc->susp_clk) 1035 return; 1036 1037 /* 1038 * The power down scale field specifies how many suspend_clk 1039 * periods fit into a 16KHz clock period. When performing 1040 * the division, round up the remainder. 1041 * 1042 * The power down scale value is calculated using the fastest 1043 * frequency of the suspend_clk. If it isn't fixed (but within 1044 * the accuracy requirement), the driver may not know the max 1045 * rate of the suspend_clk, so only update the power down scale 1046 * if the default is less than the calculated value from 1047 * clk_get_rate() or if the default is questionably high 1048 * (3x or more) to be within the requirement. 1049 */ 1050 scale = DIV_ROUND_UP(clk_get_rate(dwc->susp_clk), 16000); 1051 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 1052 if ((reg & DWC3_GCTL_PWRDNSCALE_MASK) < DWC3_GCTL_PWRDNSCALE(scale) || 1053 (reg & DWC3_GCTL_PWRDNSCALE_MASK) > DWC3_GCTL_PWRDNSCALE(scale*3)) { 1054 reg &= ~(DWC3_GCTL_PWRDNSCALE_MASK); 1055 reg |= DWC3_GCTL_PWRDNSCALE(scale); 1056 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 1057 } 1058 } 1059 1060 /** 1061 * dwc3_core_init - Low-level initialization of DWC3 Core 1062 * @dwc: Pointer to our controller context structure 1063 * 1064 * Returns 0 on success otherwise negative errno. 1065 */ 1066 static int dwc3_core_init(struct dwc3 *dwc) 1067 { 1068 unsigned int hw_mode; 1069 u32 reg; 1070 int ret; 1071 1072 hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); 1073 1074 /* 1075 * Write Linux Version Code to our GUID register so it's easy to figure 1076 * out which kernel version a bug was found. 1077 */ 1078 dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE); 1079 1080 ret = dwc3_phy_setup(dwc); 1081 if (ret) 1082 return ret; 1083 1084 if (!dwc->ulpi_ready) { 1085 ret = dwc3_core_ulpi_init(dwc); 1086 if (ret) { 1087 if (ret == -ETIMEDOUT) { 1088 dwc3_core_soft_reset(dwc); 1089 ret = -EPROBE_DEFER; 1090 } 1091 return ret; 1092 } 1093 dwc->ulpi_ready = true; 1094 } 1095 1096 if (!dwc->phys_ready) { 1097 ret = dwc3_core_get_phy(dwc); 1098 if (ret) 1099 goto err_exit_ulpi; 1100 dwc->phys_ready = true; 1101 } 1102 1103 ret = dwc3_phy_init(dwc); 1104 if (ret) 1105 goto err_exit_ulpi; 1106 1107 ret = dwc3_core_soft_reset(dwc); 1108 if (ret) 1109 goto err_exit_phy; 1110 1111 if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD && 1112 !DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) { 1113 if (!dwc->dis_u3_susphy_quirk) { 1114 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)); 1115 reg |= DWC3_GUSB3PIPECTL_SUSPHY; 1116 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg); 1117 } 1118 1119 if (!dwc->dis_u2_susphy_quirk) { 1120 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 1121 reg |= DWC3_GUSB2PHYCFG_SUSPHY; 1122 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 1123 } 1124 } 1125 1126 dwc3_core_setup_global_control(dwc); 1127 dwc3_core_num_eps(dwc); 1128 1129 /* Set power down scale of suspend_clk */ 1130 dwc3_set_power_down_clk_scale(dwc); 1131 1132 /* Adjust Frame Length */ 1133 dwc3_frame_length_adjustment(dwc); 1134 1135 /* Adjust Reference Clock Period */ 1136 dwc3_ref_clk_period(dwc); 1137 1138 dwc3_set_incr_burst_type(dwc); 1139 1140 ret = dwc3_phy_power_on(dwc); 1141 if (ret) 1142 goto err_exit_phy; 1143 1144 ret = dwc3_event_buffers_setup(dwc); 1145 if (ret) { 1146 dev_err(dwc->dev, "failed to setup event buffers\n"); 1147 goto err_power_off_phy; 1148 } 1149 1150 /* 1151 * ENDXFER polling is available on version 3.10a and later of 1152 * the DWC_usb3 controller. It is NOT available in the 1153 * DWC_usb31 controller. 1154 */ 1155 if (DWC3_VER_IS_WITHIN(DWC3, 310A, ANY)) { 1156 reg = dwc3_readl(dwc->regs, DWC3_GUCTL2); 1157 reg |= DWC3_GUCTL2_RST_ACTBITLATER; 1158 dwc3_writel(dwc->regs, DWC3_GUCTL2, reg); 1159 } 1160 1161 /* 1162 * When configured in HOST mode, after issuing U3/L2 exit controller 1163 * fails to send proper CRC checksum in CRC5 feild. Because of this 1164 * behaviour Transaction Error is generated, resulting in reset and 1165 * re-enumeration of usb device attached. All the termsel, xcvrsel, 1166 * opmode becomes 0 during end of resume. Enabling bit 10 of GUCTL1 1167 * will correct this problem. This option is to support certain 1168 * legacy ULPI PHYs. 1169 */ 1170 if (dwc->resume_hs_terminations) { 1171 reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); 1172 reg |= DWC3_GUCTL1_RESUME_OPMODE_HS_HOST; 1173 dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); 1174 } 1175 1176 if (!DWC3_VER_IS_PRIOR(DWC3, 250A)) { 1177 reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); 1178 1179 /* 1180 * Enable hardware control of sending remote wakeup 1181 * in HS when the device is in the L1 state. 1182 */ 1183 if (!DWC3_VER_IS_PRIOR(DWC3, 290A)) 1184 reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW; 1185 1186 /* 1187 * Decouple USB 2.0 L1 & L2 events which will allow for 1188 * gadget driver to only receive U3/L2 suspend & wakeup 1189 * events and prevent the more frequent L1 LPM transitions 1190 * from interrupting the driver. 1191 */ 1192 if (!DWC3_VER_IS_PRIOR(DWC3, 300A)) 1193 reg |= DWC3_GUCTL1_DEV_DECOUPLE_L1L2_EVT; 1194 1195 if (dwc->dis_tx_ipgap_linecheck_quirk) 1196 reg |= DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS; 1197 1198 if (dwc->parkmode_disable_ss_quirk) 1199 reg |= DWC3_GUCTL1_PARKMODE_DISABLE_SS; 1200 1201 if (dwc->parkmode_disable_hs_quirk) 1202 reg |= DWC3_GUCTL1_PARKMODE_DISABLE_HS; 1203 1204 if (DWC3_VER_IS_WITHIN(DWC3, 290A, ANY) && 1205 (dwc->maximum_speed == USB_SPEED_HIGH || 1206 dwc->maximum_speed == USB_SPEED_FULL)) 1207 reg |= DWC3_GUCTL1_DEV_FORCE_20_CLK_FOR_30_CLK; 1208 1209 dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); 1210 } 1211 1212 if (dwc->dr_mode == USB_DR_MODE_HOST || 1213 dwc->dr_mode == USB_DR_MODE_OTG) { 1214 reg = dwc3_readl(dwc->regs, DWC3_GUCTL); 1215 1216 /* 1217 * Enable Auto retry Feature to make the controller operating in 1218 * Host mode on seeing transaction errors(CRC errors or internal 1219 * overrun scenerios) on IN transfers to reply to the device 1220 * with a non-terminating retry ACK (i.e, an ACK transcation 1221 * packet with Retry=1 & Nump != 0) 1222 */ 1223 reg |= DWC3_GUCTL_HSTINAUTORETRY; 1224 1225 dwc3_writel(dwc->regs, DWC3_GUCTL, reg); 1226 } 1227 1228 /* 1229 * Must config both number of packets and max burst settings to enable 1230 * RX and/or TX threshold. 1231 */ 1232 if (!DWC3_IP_IS(DWC3) && dwc->dr_mode == USB_DR_MODE_HOST) { 1233 u8 rx_thr_num = dwc->rx_thr_num_pkt_prd; 1234 u8 rx_maxburst = dwc->rx_max_burst_prd; 1235 u8 tx_thr_num = dwc->tx_thr_num_pkt_prd; 1236 u8 tx_maxburst = dwc->tx_max_burst_prd; 1237 1238 if (rx_thr_num && rx_maxburst) { 1239 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG); 1240 reg |= DWC31_RXTHRNUMPKTSEL_PRD; 1241 1242 reg &= ~DWC31_RXTHRNUMPKT_PRD(~0); 1243 reg |= DWC31_RXTHRNUMPKT_PRD(rx_thr_num); 1244 1245 reg &= ~DWC31_MAXRXBURSTSIZE_PRD(~0); 1246 reg |= DWC31_MAXRXBURSTSIZE_PRD(rx_maxburst); 1247 1248 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg); 1249 } 1250 1251 if (tx_thr_num && tx_maxburst) { 1252 reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG); 1253 reg |= DWC31_TXTHRNUMPKTSEL_PRD; 1254 1255 reg &= ~DWC31_TXTHRNUMPKT_PRD(~0); 1256 reg |= DWC31_TXTHRNUMPKT_PRD(tx_thr_num); 1257 1258 reg &= ~DWC31_MAXTXBURSTSIZE_PRD(~0); 1259 reg |= DWC31_MAXTXBURSTSIZE_PRD(tx_maxburst); 1260 1261 dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg); 1262 } 1263 } 1264 1265 return 0; 1266 1267 err_power_off_phy: 1268 dwc3_phy_power_off(dwc); 1269 err_exit_phy: 1270 dwc3_phy_exit(dwc); 1271 err_exit_ulpi: 1272 dwc3_ulpi_exit(dwc); 1273 1274 return ret; 1275 } 1276 1277 static int dwc3_core_get_phy(struct dwc3 *dwc) 1278 { 1279 struct device *dev = dwc->dev; 1280 struct device_node *node = dev->of_node; 1281 int ret; 1282 1283 if (node) { 1284 dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0); 1285 dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1); 1286 } else { 1287 dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 1288 dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3); 1289 } 1290 1291 if (IS_ERR(dwc->usb2_phy)) { 1292 ret = PTR_ERR(dwc->usb2_phy); 1293 if (ret == -ENXIO || ret == -ENODEV) 1294 dwc->usb2_phy = NULL; 1295 else 1296 return dev_err_probe(dev, ret, "no usb2 phy configured\n"); 1297 } 1298 1299 if (IS_ERR(dwc->usb3_phy)) { 1300 ret = PTR_ERR(dwc->usb3_phy); 1301 if (ret == -ENXIO || ret == -ENODEV) 1302 dwc->usb3_phy = NULL; 1303 else 1304 return dev_err_probe(dev, ret, "no usb3 phy configured\n"); 1305 } 1306 1307 dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy"); 1308 if (IS_ERR(dwc->usb2_generic_phy)) { 1309 ret = PTR_ERR(dwc->usb2_generic_phy); 1310 if (ret == -ENOSYS || ret == -ENODEV) 1311 dwc->usb2_generic_phy = NULL; 1312 else 1313 return dev_err_probe(dev, ret, "no usb2 phy configured\n"); 1314 } 1315 1316 dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy"); 1317 if (IS_ERR(dwc->usb3_generic_phy)) { 1318 ret = PTR_ERR(dwc->usb3_generic_phy); 1319 if (ret == -ENOSYS || ret == -ENODEV) 1320 dwc->usb3_generic_phy = NULL; 1321 else 1322 return dev_err_probe(dev, ret, "no usb3 phy configured\n"); 1323 } 1324 1325 return 0; 1326 } 1327 1328 static int dwc3_core_init_mode(struct dwc3 *dwc) 1329 { 1330 struct device *dev = dwc->dev; 1331 int ret; 1332 1333 switch (dwc->dr_mode) { 1334 case USB_DR_MODE_PERIPHERAL: 1335 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE); 1336 1337 if (dwc->usb2_phy) 1338 otg_set_vbus(dwc->usb2_phy->otg, false); 1339 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE); 1340 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE); 1341 1342 ret = dwc3_gadget_init(dwc); 1343 if (ret) 1344 return dev_err_probe(dev, ret, "failed to initialize gadget\n"); 1345 break; 1346 case USB_DR_MODE_HOST: 1347 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); 1348 1349 if (dwc->usb2_phy) 1350 otg_set_vbus(dwc->usb2_phy->otg, true); 1351 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST); 1352 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST); 1353 1354 ret = dwc3_host_init(dwc); 1355 if (ret) 1356 return dev_err_probe(dev, ret, "failed to initialize host\n"); 1357 break; 1358 case USB_DR_MODE_OTG: 1359 INIT_WORK(&dwc->drd_work, __dwc3_set_mode); 1360 ret = dwc3_drd_init(dwc); 1361 if (ret) 1362 return dev_err_probe(dev, ret, "failed to initialize dual-role\n"); 1363 break; 1364 default: 1365 dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode); 1366 return -EINVAL; 1367 } 1368 1369 return 0; 1370 } 1371 1372 static void dwc3_core_exit_mode(struct dwc3 *dwc) 1373 { 1374 switch (dwc->dr_mode) { 1375 case USB_DR_MODE_PERIPHERAL: 1376 dwc3_gadget_exit(dwc); 1377 break; 1378 case USB_DR_MODE_HOST: 1379 dwc3_host_exit(dwc); 1380 break; 1381 case USB_DR_MODE_OTG: 1382 dwc3_drd_exit(dwc); 1383 break; 1384 default: 1385 /* do nothing */ 1386 break; 1387 } 1388 1389 /* de-assert DRVVBUS for HOST and OTG mode */ 1390 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE); 1391 } 1392 1393 static void dwc3_get_properties(struct dwc3 *dwc) 1394 { 1395 struct device *dev = dwc->dev; 1396 u8 lpm_nyet_threshold; 1397 u8 tx_de_emphasis; 1398 u8 hird_threshold; 1399 u8 rx_thr_num_pkt_prd = 0; 1400 u8 rx_max_burst_prd = 0; 1401 u8 tx_thr_num_pkt_prd = 0; 1402 u8 tx_max_burst_prd = 0; 1403 u8 tx_fifo_resize_max_num; 1404 const char *usb_psy_name; 1405 int ret; 1406 1407 /* default to highest possible threshold */ 1408 lpm_nyet_threshold = 0xf; 1409 1410 /* default to -3.5dB de-emphasis */ 1411 tx_de_emphasis = 1; 1412 1413 /* 1414 * default to assert utmi_sleep_n and use maximum allowed HIRD 1415 * threshold value of 0b1100 1416 */ 1417 hird_threshold = 12; 1418 1419 /* 1420 * default to a TXFIFO size large enough to fit 6 max packets. This 1421 * allows for systems with larger bus latencies to have some headroom 1422 * for endpoints that have a large bMaxBurst value. 1423 */ 1424 tx_fifo_resize_max_num = 6; 1425 1426 dwc->maximum_speed = usb_get_maximum_speed(dev); 1427 dwc->max_ssp_rate = usb_get_maximum_ssp_rate(dev); 1428 dwc->dr_mode = usb_get_dr_mode(dev); 1429 dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node); 1430 1431 dwc->sysdev_is_parent = device_property_read_bool(dev, 1432 "linux,sysdev_is_parent"); 1433 if (dwc->sysdev_is_parent) 1434 dwc->sysdev = dwc->dev->parent; 1435 else 1436 dwc->sysdev = dwc->dev; 1437 1438 ret = device_property_read_string(dev, "usb-psy-name", &usb_psy_name); 1439 if (ret >= 0) { 1440 dwc->usb_psy = power_supply_get_by_name(usb_psy_name); 1441 if (!dwc->usb_psy) 1442 dev_err(dev, "couldn't get usb power supply\n"); 1443 } 1444 1445 dwc->has_lpm_erratum = device_property_read_bool(dev, 1446 "snps,has-lpm-erratum"); 1447 device_property_read_u8(dev, "snps,lpm-nyet-threshold", 1448 &lpm_nyet_threshold); 1449 dwc->is_utmi_l1_suspend = device_property_read_bool(dev, 1450 "snps,is-utmi-l1-suspend"); 1451 device_property_read_u8(dev, "snps,hird-threshold", 1452 &hird_threshold); 1453 dwc->dis_start_transfer_quirk = device_property_read_bool(dev, 1454 "snps,dis-start-transfer-quirk"); 1455 dwc->usb3_lpm_capable = device_property_read_bool(dev, 1456 "snps,usb3_lpm_capable"); 1457 dwc->usb2_lpm_disable = device_property_read_bool(dev, 1458 "snps,usb2-lpm-disable"); 1459 dwc->usb2_gadget_lpm_disable = device_property_read_bool(dev, 1460 "snps,usb2-gadget-lpm-disable"); 1461 device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd", 1462 &rx_thr_num_pkt_prd); 1463 device_property_read_u8(dev, "snps,rx-max-burst-prd", 1464 &rx_max_burst_prd); 1465 device_property_read_u8(dev, "snps,tx-thr-num-pkt-prd", 1466 &tx_thr_num_pkt_prd); 1467 device_property_read_u8(dev, "snps,tx-max-burst-prd", 1468 &tx_max_burst_prd); 1469 dwc->do_fifo_resize = device_property_read_bool(dev, 1470 "tx-fifo-resize"); 1471 if (dwc->do_fifo_resize) 1472 device_property_read_u8(dev, "tx-fifo-max-num", 1473 &tx_fifo_resize_max_num); 1474 1475 dwc->disable_scramble_quirk = device_property_read_bool(dev, 1476 "snps,disable_scramble_quirk"); 1477 dwc->u2exit_lfps_quirk = device_property_read_bool(dev, 1478 "snps,u2exit_lfps_quirk"); 1479 dwc->u2ss_inp3_quirk = device_property_read_bool(dev, 1480 "snps,u2ss_inp3_quirk"); 1481 dwc->req_p1p2p3_quirk = device_property_read_bool(dev, 1482 "snps,req_p1p2p3_quirk"); 1483 dwc->del_p1p2p3_quirk = device_property_read_bool(dev, 1484 "snps,del_p1p2p3_quirk"); 1485 dwc->del_phy_power_chg_quirk = device_property_read_bool(dev, 1486 "snps,del_phy_power_chg_quirk"); 1487 dwc->lfps_filter_quirk = device_property_read_bool(dev, 1488 "snps,lfps_filter_quirk"); 1489 dwc->rx_detect_poll_quirk = device_property_read_bool(dev, 1490 "snps,rx_detect_poll_quirk"); 1491 dwc->dis_u3_susphy_quirk = device_property_read_bool(dev, 1492 "snps,dis_u3_susphy_quirk"); 1493 dwc->dis_u2_susphy_quirk = device_property_read_bool(dev, 1494 "snps,dis_u2_susphy_quirk"); 1495 dwc->dis_enblslpm_quirk = device_property_read_bool(dev, 1496 "snps,dis_enblslpm_quirk"); 1497 dwc->dis_u1_entry_quirk = device_property_read_bool(dev, 1498 "snps,dis-u1-entry-quirk"); 1499 dwc->dis_u2_entry_quirk = device_property_read_bool(dev, 1500 "snps,dis-u2-entry-quirk"); 1501 dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev, 1502 "snps,dis_rxdet_inp3_quirk"); 1503 dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev, 1504 "snps,dis-u2-freeclk-exists-quirk"); 1505 dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev, 1506 "snps,dis-del-phy-power-chg-quirk"); 1507 dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev, 1508 "snps,dis-tx-ipgap-linecheck-quirk"); 1509 dwc->resume_hs_terminations = device_property_read_bool(dev, 1510 "snps,resume-hs-terminations"); 1511 dwc->ulpi_ext_vbus_drv = device_property_read_bool(dev, 1512 "snps,ulpi-ext-vbus-drv"); 1513 dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev, 1514 "snps,parkmode-disable-ss-quirk"); 1515 dwc->parkmode_disable_hs_quirk = device_property_read_bool(dev, 1516 "snps,parkmode-disable-hs-quirk"); 1517 dwc->gfladj_refclk_lpm_sel = device_property_read_bool(dev, 1518 "snps,gfladj-refclk-lpm-sel-quirk"); 1519 1520 dwc->tx_de_emphasis_quirk = device_property_read_bool(dev, 1521 "snps,tx_de_emphasis_quirk"); 1522 device_property_read_u8(dev, "snps,tx_de_emphasis", 1523 &tx_de_emphasis); 1524 device_property_read_string(dev, "snps,hsphy_interface", 1525 &dwc->hsphy_interface); 1526 device_property_read_u32(dev, "snps,quirk-frame-length-adjustment", 1527 &dwc->fladj); 1528 device_property_read_u32(dev, "snps,ref-clock-period-ns", 1529 &dwc->ref_clk_per); 1530 1531 dwc->dis_metastability_quirk = device_property_read_bool(dev, 1532 "snps,dis_metastability_quirk"); 1533 1534 dwc->dis_split_quirk = device_property_read_bool(dev, 1535 "snps,dis-split-quirk"); 1536 1537 dwc->lpm_nyet_threshold = lpm_nyet_threshold; 1538 dwc->tx_de_emphasis = tx_de_emphasis; 1539 1540 dwc->hird_threshold = hird_threshold; 1541 1542 dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd; 1543 dwc->rx_max_burst_prd = rx_max_burst_prd; 1544 1545 dwc->tx_thr_num_pkt_prd = tx_thr_num_pkt_prd; 1546 dwc->tx_max_burst_prd = tx_max_burst_prd; 1547 1548 dwc->imod_interval = 0; 1549 1550 dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num; 1551 } 1552 1553 /* check whether the core supports IMOD */ 1554 bool dwc3_has_imod(struct dwc3 *dwc) 1555 { 1556 return DWC3_VER_IS_WITHIN(DWC3, 300A, ANY) || 1557 DWC3_VER_IS_WITHIN(DWC31, 120A, ANY) || 1558 DWC3_IP_IS(DWC32); 1559 } 1560 1561 static void dwc3_check_params(struct dwc3 *dwc) 1562 { 1563 struct device *dev = dwc->dev; 1564 unsigned int hwparam_gen = 1565 DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3); 1566 1567 /* Check for proper value of imod_interval */ 1568 if (dwc->imod_interval && !dwc3_has_imod(dwc)) { 1569 dev_warn(dwc->dev, "Interrupt moderation not supported\n"); 1570 dwc->imod_interval = 0; 1571 } 1572 1573 /* 1574 * Workaround for STAR 9000961433 which affects only version 1575 * 3.00a of the DWC_usb3 core. This prevents the controller 1576 * interrupt from being masked while handling events. IMOD 1577 * allows us to work around this issue. Enable it for the 1578 * affected version. 1579 */ 1580 if (!dwc->imod_interval && 1581 DWC3_VER_IS(DWC3, 300A)) 1582 dwc->imod_interval = 1; 1583 1584 /* Check the maximum_speed parameter */ 1585 switch (dwc->maximum_speed) { 1586 case USB_SPEED_FULL: 1587 case USB_SPEED_HIGH: 1588 break; 1589 case USB_SPEED_SUPER: 1590 if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS) 1591 dev_warn(dev, "UDC doesn't support Gen 1\n"); 1592 break; 1593 case USB_SPEED_SUPER_PLUS: 1594 if ((DWC3_IP_IS(DWC32) && 1595 hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS) || 1596 (!DWC3_IP_IS(DWC32) && 1597 hwparam_gen != DWC3_GHWPARAMS3_SSPHY_IFC_GEN2)) 1598 dev_warn(dev, "UDC doesn't support SSP\n"); 1599 break; 1600 default: 1601 dev_err(dev, "invalid maximum_speed parameter %d\n", 1602 dwc->maximum_speed); 1603 fallthrough; 1604 case USB_SPEED_UNKNOWN: 1605 switch (hwparam_gen) { 1606 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2: 1607 dwc->maximum_speed = USB_SPEED_SUPER_PLUS; 1608 break; 1609 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1: 1610 if (DWC3_IP_IS(DWC32)) 1611 dwc->maximum_speed = USB_SPEED_SUPER_PLUS; 1612 else 1613 dwc->maximum_speed = USB_SPEED_SUPER; 1614 break; 1615 case DWC3_GHWPARAMS3_SSPHY_IFC_DIS: 1616 dwc->maximum_speed = USB_SPEED_HIGH; 1617 break; 1618 default: 1619 dwc->maximum_speed = USB_SPEED_SUPER; 1620 break; 1621 } 1622 break; 1623 } 1624 1625 /* 1626 * Currently the controller does not have visibility into the HW 1627 * parameter to determine the maximum number of lanes the HW supports. 1628 * If the number of lanes is not specified in the device property, then 1629 * set the default to support dual-lane for DWC_usb32 and single-lane 1630 * for DWC_usb31 for super-speed-plus. 1631 */ 1632 if (dwc->maximum_speed == USB_SPEED_SUPER_PLUS) { 1633 switch (dwc->max_ssp_rate) { 1634 case USB_SSP_GEN_2x1: 1635 if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_GEN1) 1636 dev_warn(dev, "UDC only supports Gen 1\n"); 1637 break; 1638 case USB_SSP_GEN_1x2: 1639 case USB_SSP_GEN_2x2: 1640 if (DWC3_IP_IS(DWC31)) 1641 dev_warn(dev, "UDC only supports single lane\n"); 1642 break; 1643 case USB_SSP_GEN_UNKNOWN: 1644 default: 1645 switch (hwparam_gen) { 1646 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2: 1647 if (DWC3_IP_IS(DWC32)) 1648 dwc->max_ssp_rate = USB_SSP_GEN_2x2; 1649 else 1650 dwc->max_ssp_rate = USB_SSP_GEN_2x1; 1651 break; 1652 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1: 1653 if (DWC3_IP_IS(DWC32)) 1654 dwc->max_ssp_rate = USB_SSP_GEN_1x2; 1655 break; 1656 } 1657 break; 1658 } 1659 } 1660 } 1661 1662 static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc) 1663 { 1664 struct device *dev = dwc->dev; 1665 struct device_node *np_phy; 1666 struct extcon_dev *edev = NULL; 1667 const char *name; 1668 1669 if (device_property_read_bool(dev, "extcon")) 1670 return extcon_get_edev_by_phandle(dev, 0); 1671 1672 /* 1673 * Device tree platforms should get extcon via phandle. 1674 * On ACPI platforms, we get the name from a device property. 1675 * This device property is for kernel internal use only and 1676 * is expected to be set by the glue code. 1677 */ 1678 if (device_property_read_string(dev, "linux,extcon-name", &name) == 0) 1679 return extcon_get_extcon_dev(name); 1680 1681 /* 1682 * Check explicitly if "usb-role-switch" is used since 1683 * extcon_find_edev_by_node() can not be used to check the absence of 1684 * an extcon device. In the absence of an device it will always return 1685 * EPROBE_DEFER. 1686 */ 1687 if (IS_ENABLED(CONFIG_USB_ROLE_SWITCH) && 1688 device_property_read_bool(dev, "usb-role-switch")) 1689 return NULL; 1690 1691 /* 1692 * Try to get an extcon device from the USB PHY controller's "port" 1693 * node. Check if it has the "port" node first, to avoid printing the 1694 * error message from underlying code, as it's a valid case: extcon 1695 * device (and "port" node) may be missing in case of "usb-role-switch" 1696 * or OTG mode. 1697 */ 1698 np_phy = of_parse_phandle(dev->of_node, "phys", 0); 1699 if (of_graph_is_present(np_phy)) { 1700 struct device_node *np_conn; 1701 1702 np_conn = of_graph_get_remote_node(np_phy, -1, -1); 1703 if (np_conn) 1704 edev = extcon_find_edev_by_node(np_conn); 1705 of_node_put(np_conn); 1706 } 1707 of_node_put(np_phy); 1708 1709 return edev; 1710 } 1711 1712 static int dwc3_get_clocks(struct dwc3 *dwc) 1713 { 1714 struct device *dev = dwc->dev; 1715 1716 if (!dev->of_node) 1717 return 0; 1718 1719 /* 1720 * Clocks are optional, but new DT platforms should support all clocks 1721 * as required by the DT-binding. 1722 * Some devices have different clock names in legacy device trees, 1723 * check for them to retain backwards compatibility. 1724 */ 1725 dwc->bus_clk = devm_clk_get_optional(dev, "bus_early"); 1726 if (IS_ERR(dwc->bus_clk)) { 1727 return dev_err_probe(dev, PTR_ERR(dwc->bus_clk), 1728 "could not get bus clock\n"); 1729 } 1730 1731 if (dwc->bus_clk == NULL) { 1732 dwc->bus_clk = devm_clk_get_optional(dev, "bus_clk"); 1733 if (IS_ERR(dwc->bus_clk)) { 1734 return dev_err_probe(dev, PTR_ERR(dwc->bus_clk), 1735 "could not get bus clock\n"); 1736 } 1737 } 1738 1739 dwc->ref_clk = devm_clk_get_optional(dev, "ref"); 1740 if (IS_ERR(dwc->ref_clk)) { 1741 return dev_err_probe(dev, PTR_ERR(dwc->ref_clk), 1742 "could not get ref clock\n"); 1743 } 1744 1745 if (dwc->ref_clk == NULL) { 1746 dwc->ref_clk = devm_clk_get_optional(dev, "ref_clk"); 1747 if (IS_ERR(dwc->ref_clk)) { 1748 return dev_err_probe(dev, PTR_ERR(dwc->ref_clk), 1749 "could not get ref clock\n"); 1750 } 1751 } 1752 1753 dwc->susp_clk = devm_clk_get_optional(dev, "suspend"); 1754 if (IS_ERR(dwc->susp_clk)) { 1755 return dev_err_probe(dev, PTR_ERR(dwc->susp_clk), 1756 "could not get suspend clock\n"); 1757 } 1758 1759 if (dwc->susp_clk == NULL) { 1760 dwc->susp_clk = devm_clk_get_optional(dev, "suspend_clk"); 1761 if (IS_ERR(dwc->susp_clk)) { 1762 return dev_err_probe(dev, PTR_ERR(dwc->susp_clk), 1763 "could not get suspend clock\n"); 1764 } 1765 } 1766 1767 return 0; 1768 } 1769 1770 static int dwc3_probe(struct platform_device *pdev) 1771 { 1772 struct device *dev = &pdev->dev; 1773 struct resource *res, dwc_res; 1774 void __iomem *regs; 1775 struct dwc3 *dwc; 1776 int ret; 1777 1778 dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL); 1779 if (!dwc) 1780 return -ENOMEM; 1781 1782 dwc->dev = dev; 1783 1784 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1785 if (!res) { 1786 dev_err(dev, "missing memory resource\n"); 1787 return -ENODEV; 1788 } 1789 1790 dwc->xhci_resources[0].start = res->start; 1791 dwc->xhci_resources[0].end = dwc->xhci_resources[0].start + 1792 DWC3_XHCI_REGS_END; 1793 dwc->xhci_resources[0].flags = res->flags; 1794 dwc->xhci_resources[0].name = res->name; 1795 1796 /* 1797 * Request memory region but exclude xHCI regs, 1798 * since it will be requested by the xhci-plat driver. 1799 */ 1800 dwc_res = *res; 1801 dwc_res.start += DWC3_GLOBALS_REGS_START; 1802 1803 if (dev->of_node) { 1804 struct device_node *parent = of_get_parent(dev->of_node); 1805 1806 if (of_device_is_compatible(parent, "realtek,rtd-dwc3")) { 1807 dwc_res.start -= DWC3_GLOBALS_REGS_START; 1808 dwc_res.start += DWC3_RTK_RTD_GLOBALS_REGS_START; 1809 } 1810 1811 of_node_put(parent); 1812 } 1813 1814 regs = devm_ioremap_resource(dev, &dwc_res); 1815 if (IS_ERR(regs)) 1816 return PTR_ERR(regs); 1817 1818 dwc->regs = regs; 1819 dwc->regs_size = resource_size(&dwc_res); 1820 1821 dwc3_get_properties(dwc); 1822 1823 dwc->reset = devm_reset_control_array_get_optional_shared(dev); 1824 if (IS_ERR(dwc->reset)) { 1825 ret = PTR_ERR(dwc->reset); 1826 goto err_put_psy; 1827 } 1828 1829 ret = dwc3_get_clocks(dwc); 1830 if (ret) 1831 goto err_put_psy; 1832 1833 ret = reset_control_deassert(dwc->reset); 1834 if (ret) 1835 goto err_put_psy; 1836 1837 ret = dwc3_clk_enable(dwc); 1838 if (ret) 1839 goto err_assert_reset; 1840 1841 if (!dwc3_core_is_valid(dwc)) { 1842 dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n"); 1843 ret = -ENODEV; 1844 goto err_disable_clks; 1845 } 1846 1847 platform_set_drvdata(pdev, dwc); 1848 dwc3_cache_hwparams(dwc); 1849 1850 if (!dwc->sysdev_is_parent && 1851 DWC3_GHWPARAMS0_AWIDTH(dwc->hwparams.hwparams0) == 64) { 1852 ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64)); 1853 if (ret) 1854 goto err_disable_clks; 1855 } 1856 1857 spin_lock_init(&dwc->lock); 1858 mutex_init(&dwc->mutex); 1859 1860 pm_runtime_get_noresume(dev); 1861 pm_runtime_set_active(dev); 1862 pm_runtime_use_autosuspend(dev); 1863 pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY); 1864 pm_runtime_enable(dev); 1865 1866 pm_runtime_forbid(dev); 1867 1868 ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE); 1869 if (ret) { 1870 dev_err(dwc->dev, "failed to allocate event buffers\n"); 1871 ret = -ENOMEM; 1872 goto err_allow_rpm; 1873 } 1874 1875 dwc->edev = dwc3_get_extcon(dwc); 1876 if (IS_ERR(dwc->edev)) { 1877 ret = dev_err_probe(dwc->dev, PTR_ERR(dwc->edev), "failed to get extcon\n"); 1878 goto err_free_event_buffers; 1879 } 1880 1881 ret = dwc3_get_dr_mode(dwc); 1882 if (ret) 1883 goto err_free_event_buffers; 1884 1885 ret = dwc3_core_init(dwc); 1886 if (ret) { 1887 dev_err_probe(dev, ret, "failed to initialize core\n"); 1888 goto err_free_event_buffers; 1889 } 1890 1891 dwc3_check_params(dwc); 1892 dwc3_debugfs_init(dwc); 1893 1894 ret = dwc3_core_init_mode(dwc); 1895 if (ret) 1896 goto err_exit_debugfs; 1897 1898 pm_runtime_put(dev); 1899 1900 return 0; 1901 1902 err_exit_debugfs: 1903 dwc3_debugfs_exit(dwc); 1904 dwc3_event_buffers_cleanup(dwc); 1905 dwc3_phy_power_off(dwc); 1906 dwc3_phy_exit(dwc); 1907 dwc3_ulpi_exit(dwc); 1908 err_free_event_buffers: 1909 dwc3_free_event_buffers(dwc); 1910 err_allow_rpm: 1911 pm_runtime_allow(dev); 1912 pm_runtime_disable(dev); 1913 pm_runtime_dont_use_autosuspend(dev); 1914 pm_runtime_set_suspended(dev); 1915 pm_runtime_put_noidle(dev); 1916 err_disable_clks: 1917 dwc3_clk_disable(dwc); 1918 err_assert_reset: 1919 reset_control_assert(dwc->reset); 1920 err_put_psy: 1921 if (dwc->usb_psy) 1922 power_supply_put(dwc->usb_psy); 1923 1924 return ret; 1925 } 1926 1927 static void dwc3_remove(struct platform_device *pdev) 1928 { 1929 struct dwc3 *dwc = platform_get_drvdata(pdev); 1930 1931 pm_runtime_get_sync(&pdev->dev); 1932 1933 dwc3_core_exit_mode(dwc); 1934 dwc3_debugfs_exit(dwc); 1935 1936 dwc3_core_exit(dwc); 1937 dwc3_ulpi_exit(dwc); 1938 1939 pm_runtime_allow(&pdev->dev); 1940 pm_runtime_disable(&pdev->dev); 1941 pm_runtime_dont_use_autosuspend(&pdev->dev); 1942 pm_runtime_put_noidle(&pdev->dev); 1943 /* 1944 * HACK: Clear the driver data, which is currently accessed by parent 1945 * glue drivers, before allowing the parent to suspend. 1946 */ 1947 platform_set_drvdata(pdev, NULL); 1948 pm_runtime_set_suspended(&pdev->dev); 1949 1950 dwc3_free_event_buffers(dwc); 1951 1952 if (dwc->usb_psy) 1953 power_supply_put(dwc->usb_psy); 1954 } 1955 1956 #ifdef CONFIG_PM 1957 static int dwc3_core_init_for_resume(struct dwc3 *dwc) 1958 { 1959 int ret; 1960 1961 ret = reset_control_deassert(dwc->reset); 1962 if (ret) 1963 return ret; 1964 1965 ret = dwc3_clk_enable(dwc); 1966 if (ret) 1967 goto assert_reset; 1968 1969 ret = dwc3_core_init(dwc); 1970 if (ret) 1971 goto disable_clks; 1972 1973 return 0; 1974 1975 disable_clks: 1976 dwc3_clk_disable(dwc); 1977 assert_reset: 1978 reset_control_assert(dwc->reset); 1979 1980 return ret; 1981 } 1982 1983 static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) 1984 { 1985 unsigned long flags; 1986 u32 reg; 1987 1988 switch (dwc->current_dr_role) { 1989 case DWC3_GCTL_PRTCAP_DEVICE: 1990 if (pm_runtime_suspended(dwc->dev)) 1991 break; 1992 dwc3_gadget_suspend(dwc); 1993 synchronize_irq(dwc->irq_gadget); 1994 dwc3_core_exit(dwc); 1995 break; 1996 case DWC3_GCTL_PRTCAP_HOST: 1997 if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) { 1998 dwc3_core_exit(dwc); 1999 break; 2000 } 2001 2002 /* Let controller to suspend HSPHY before PHY driver suspends */ 2003 if (dwc->dis_u2_susphy_quirk || 2004 dwc->dis_enblslpm_quirk) { 2005 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 2006 reg |= DWC3_GUSB2PHYCFG_ENBLSLPM | 2007 DWC3_GUSB2PHYCFG_SUSPHY; 2008 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 2009 2010 /* Give some time for USB2 PHY to suspend */ 2011 usleep_range(5000, 6000); 2012 } 2013 2014 phy_pm_runtime_put_sync(dwc->usb2_generic_phy); 2015 phy_pm_runtime_put_sync(dwc->usb3_generic_phy); 2016 break; 2017 case DWC3_GCTL_PRTCAP_OTG: 2018 /* do nothing during runtime_suspend */ 2019 if (PMSG_IS_AUTO(msg)) 2020 break; 2021 2022 if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) { 2023 spin_lock_irqsave(&dwc->lock, flags); 2024 dwc3_gadget_suspend(dwc); 2025 spin_unlock_irqrestore(&dwc->lock, flags); 2026 synchronize_irq(dwc->irq_gadget); 2027 } 2028 2029 dwc3_otg_exit(dwc); 2030 dwc3_core_exit(dwc); 2031 break; 2032 default: 2033 /* do nothing */ 2034 break; 2035 } 2036 2037 return 0; 2038 } 2039 2040 static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) 2041 { 2042 unsigned long flags; 2043 int ret; 2044 u32 reg; 2045 2046 switch (dwc->current_dr_role) { 2047 case DWC3_GCTL_PRTCAP_DEVICE: 2048 ret = dwc3_core_init_for_resume(dwc); 2049 if (ret) 2050 return ret; 2051 2052 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE); 2053 dwc3_gadget_resume(dwc); 2054 break; 2055 case DWC3_GCTL_PRTCAP_HOST: 2056 if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) { 2057 ret = dwc3_core_init_for_resume(dwc); 2058 if (ret) 2059 return ret; 2060 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); 2061 break; 2062 } 2063 /* Restore GUSB2PHYCFG bits that were modified in suspend */ 2064 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 2065 if (dwc->dis_u2_susphy_quirk) 2066 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; 2067 2068 if (dwc->dis_enblslpm_quirk) 2069 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM; 2070 2071 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 2072 2073 phy_pm_runtime_get_sync(dwc->usb2_generic_phy); 2074 phy_pm_runtime_get_sync(dwc->usb3_generic_phy); 2075 break; 2076 case DWC3_GCTL_PRTCAP_OTG: 2077 /* nothing to do on runtime_resume */ 2078 if (PMSG_IS_AUTO(msg)) 2079 break; 2080 2081 ret = dwc3_core_init_for_resume(dwc); 2082 if (ret) 2083 return ret; 2084 2085 dwc3_set_prtcap(dwc, dwc->current_dr_role); 2086 2087 dwc3_otg_init(dwc); 2088 if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST) { 2089 dwc3_otg_host_init(dwc); 2090 } else if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) { 2091 spin_lock_irqsave(&dwc->lock, flags); 2092 dwc3_gadget_resume(dwc); 2093 spin_unlock_irqrestore(&dwc->lock, flags); 2094 } 2095 2096 break; 2097 default: 2098 /* do nothing */ 2099 break; 2100 } 2101 2102 return 0; 2103 } 2104 2105 static int dwc3_runtime_checks(struct dwc3 *dwc) 2106 { 2107 switch (dwc->current_dr_role) { 2108 case DWC3_GCTL_PRTCAP_DEVICE: 2109 if (dwc->connected) 2110 return -EBUSY; 2111 break; 2112 case DWC3_GCTL_PRTCAP_HOST: 2113 default: 2114 /* do nothing */ 2115 break; 2116 } 2117 2118 return 0; 2119 } 2120 2121 static int dwc3_runtime_suspend(struct device *dev) 2122 { 2123 struct dwc3 *dwc = dev_get_drvdata(dev); 2124 int ret; 2125 2126 if (dwc3_runtime_checks(dwc)) 2127 return -EBUSY; 2128 2129 ret = dwc3_suspend_common(dwc, PMSG_AUTO_SUSPEND); 2130 if (ret) 2131 return ret; 2132 2133 return 0; 2134 } 2135 2136 static int dwc3_runtime_resume(struct device *dev) 2137 { 2138 struct dwc3 *dwc = dev_get_drvdata(dev); 2139 int ret; 2140 2141 ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME); 2142 if (ret) 2143 return ret; 2144 2145 switch (dwc->current_dr_role) { 2146 case DWC3_GCTL_PRTCAP_DEVICE: 2147 dwc3_gadget_process_pending_events(dwc); 2148 break; 2149 case DWC3_GCTL_PRTCAP_HOST: 2150 default: 2151 /* do nothing */ 2152 break; 2153 } 2154 2155 pm_runtime_mark_last_busy(dev); 2156 2157 return 0; 2158 } 2159 2160 static int dwc3_runtime_idle(struct device *dev) 2161 { 2162 struct dwc3 *dwc = dev_get_drvdata(dev); 2163 2164 switch (dwc->current_dr_role) { 2165 case DWC3_GCTL_PRTCAP_DEVICE: 2166 if (dwc3_runtime_checks(dwc)) 2167 return -EBUSY; 2168 break; 2169 case DWC3_GCTL_PRTCAP_HOST: 2170 default: 2171 /* do nothing */ 2172 break; 2173 } 2174 2175 pm_runtime_mark_last_busy(dev); 2176 pm_runtime_autosuspend(dev); 2177 2178 return 0; 2179 } 2180 #endif /* CONFIG_PM */ 2181 2182 #ifdef CONFIG_PM_SLEEP 2183 static int dwc3_suspend(struct device *dev) 2184 { 2185 struct dwc3 *dwc = dev_get_drvdata(dev); 2186 int ret; 2187 2188 ret = dwc3_suspend_common(dwc, PMSG_SUSPEND); 2189 if (ret) 2190 return ret; 2191 2192 pinctrl_pm_select_sleep_state(dev); 2193 2194 return 0; 2195 } 2196 2197 static int dwc3_resume(struct device *dev) 2198 { 2199 struct dwc3 *dwc = dev_get_drvdata(dev); 2200 int ret; 2201 2202 pinctrl_pm_select_default_state(dev); 2203 2204 ret = dwc3_resume_common(dwc, PMSG_RESUME); 2205 if (ret) 2206 return ret; 2207 2208 pm_runtime_disable(dev); 2209 pm_runtime_set_active(dev); 2210 pm_runtime_enable(dev); 2211 2212 return 0; 2213 } 2214 2215 static void dwc3_complete(struct device *dev) 2216 { 2217 struct dwc3 *dwc = dev_get_drvdata(dev); 2218 u32 reg; 2219 2220 if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST && 2221 dwc->dis_split_quirk) { 2222 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3); 2223 reg |= DWC3_GUCTL3_SPLITDISABLE; 2224 dwc3_writel(dwc->regs, DWC3_GUCTL3, reg); 2225 } 2226 } 2227 #else 2228 #define dwc3_complete NULL 2229 #endif /* CONFIG_PM_SLEEP */ 2230 2231 static const struct dev_pm_ops dwc3_dev_pm_ops = { 2232 SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume) 2233 .complete = dwc3_complete, 2234 SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume, 2235 dwc3_runtime_idle) 2236 }; 2237 2238 #ifdef CONFIG_OF 2239 static const struct of_device_id of_dwc3_match[] = { 2240 { 2241 .compatible = "snps,dwc3" 2242 }, 2243 { 2244 .compatible = "synopsys,dwc3" 2245 }, 2246 { }, 2247 }; 2248 MODULE_DEVICE_TABLE(of, of_dwc3_match); 2249 #endif 2250 2251 #ifdef CONFIG_ACPI 2252 2253 #define ACPI_ID_INTEL_BSW "808622B7" 2254 2255 static const struct acpi_device_id dwc3_acpi_match[] = { 2256 { ACPI_ID_INTEL_BSW, 0 }, 2257 { }, 2258 }; 2259 MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match); 2260 #endif 2261 2262 static struct platform_driver dwc3_driver = { 2263 .probe = dwc3_probe, 2264 .remove_new = dwc3_remove, 2265 .driver = { 2266 .name = "dwc3", 2267 .of_match_table = of_match_ptr(of_dwc3_match), 2268 .acpi_match_table = ACPI_PTR(dwc3_acpi_match), 2269 .pm = &dwc3_dev_pm_ops, 2270 }, 2271 }; 2272 2273 module_platform_driver(dwc3_driver); 2274 2275 MODULE_ALIAS("platform:dwc3"); 2276 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 2277 MODULE_LICENSE("GPL v2"); 2278 MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver"); 2279