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 */ 49static 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 107void 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 119static 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 234out: 235 pm_runtime_mark_last_busy(dwc->dev); 236 pm_runtime_put_autosuspend(dwc->dev); 237 mutex_unlock(&dwc->mutex); 238} 239 240void 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 254u32 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 */ 272int 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 313done: 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 */ 329static 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 */ 357static 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 */ 427static 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 */ 441static 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 */ 468static 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 */ 485static 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 */ 505int 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 522void 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 537static 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 544static 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 562static 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 */ 586static 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 734static 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 751err_exit_usb2_phy: 752 phy_exit(dwc->usb2_generic_phy); 753err_shutdown_usb3_phy: 754 usb_phy_shutdown(dwc->usb3_phy); 755 usb_phy_shutdown(dwc->usb2_phy); 756 757 return ret; 758} 759 760static 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 769static 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 786err_power_off_usb2_phy: 787 phy_power_off(dwc->usb2_generic_phy); 788err_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 795static 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 804static 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 822disable_ref_clk: 823 clk_disable_unprepare(dwc->ref_clk); 824disable_bus_clk: 825 clk_disable_unprepare(dwc->bus_clk); 826 return ret; 827} 828 829static 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 836static 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 845static 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 865static 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 934static int dwc3_core_get_phy(struct dwc3 *dwc); 935static int dwc3_core_ulpi_init(struct dwc3 *dwc); 936 937/* set global incr burst type configuration registers */ 938static 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 1029static 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 1060static void dwc3_config_threshold(struct dwc3 *dwc) 1061{ 1062 u32 reg; 1063 u8 rx_thr_num; 1064 u8 rx_maxburst; 1065 u8 tx_thr_num; 1066 u8 tx_maxburst; 1067 1068 /* 1069 * Must config both number of packets and max burst settings to enable 1070 * RX and/or TX threshold. 1071 */ 1072 if (!DWC3_IP_IS(DWC3) && dwc->dr_mode == USB_DR_MODE_HOST) { 1073 rx_thr_num = dwc->rx_thr_num_pkt_prd; 1074 rx_maxburst = dwc->rx_max_burst_prd; 1075 tx_thr_num = dwc->tx_thr_num_pkt_prd; 1076 tx_maxburst = dwc->tx_max_burst_prd; 1077 1078 if (rx_thr_num && rx_maxburst) { 1079 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG); 1080 reg |= DWC31_RXTHRNUMPKTSEL_PRD; 1081 1082 reg &= ~DWC31_RXTHRNUMPKT_PRD(~0); 1083 reg |= DWC31_RXTHRNUMPKT_PRD(rx_thr_num); 1084 1085 reg &= ~DWC31_MAXRXBURSTSIZE_PRD(~0); 1086 reg |= DWC31_MAXRXBURSTSIZE_PRD(rx_maxburst); 1087 1088 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg); 1089 } 1090 1091 if (tx_thr_num && tx_maxburst) { 1092 reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG); 1093 reg |= DWC31_TXTHRNUMPKTSEL_PRD; 1094 1095 reg &= ~DWC31_TXTHRNUMPKT_PRD(~0); 1096 reg |= DWC31_TXTHRNUMPKT_PRD(tx_thr_num); 1097 1098 reg &= ~DWC31_MAXTXBURSTSIZE_PRD(~0); 1099 reg |= DWC31_MAXTXBURSTSIZE_PRD(tx_maxburst); 1100 1101 dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg); 1102 } 1103 } 1104 1105 rx_thr_num = dwc->rx_thr_num_pkt; 1106 rx_maxburst = dwc->rx_max_burst; 1107 tx_thr_num = dwc->tx_thr_num_pkt; 1108 tx_maxburst = dwc->tx_max_burst; 1109 1110 if (DWC3_IP_IS(DWC3)) { 1111 if (rx_thr_num && rx_maxburst) { 1112 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG); 1113 reg |= DWC3_GRXTHRCFG_PKTCNTSEL; 1114 1115 reg &= ~DWC3_GRXTHRCFG_RXPKTCNT(~0); 1116 reg |= DWC3_GRXTHRCFG_RXPKTCNT(rx_thr_num); 1117 1118 reg &= ~DWC3_GRXTHRCFG_MAXRXBURSTSIZE(~0); 1119 reg |= DWC3_GRXTHRCFG_MAXRXBURSTSIZE(rx_maxburst); 1120 1121 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg); 1122 } 1123 1124 if (tx_thr_num && tx_maxburst) { 1125 reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG); 1126 reg |= DWC3_GTXTHRCFG_PKTCNTSEL; 1127 1128 reg &= ~DWC3_GTXTHRCFG_TXPKTCNT(~0); 1129 reg |= DWC3_GTXTHRCFG_TXPKTCNT(tx_thr_num); 1130 1131 reg &= ~DWC3_GTXTHRCFG_MAXTXBURSTSIZE(~0); 1132 reg |= DWC3_GTXTHRCFG_MAXTXBURSTSIZE(tx_maxburst); 1133 1134 dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg); 1135 } 1136 } else { 1137 if (rx_thr_num && rx_maxburst) { 1138 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG); 1139 reg |= DWC31_GRXTHRCFG_PKTCNTSEL; 1140 1141 reg &= ~DWC31_GRXTHRCFG_RXPKTCNT(~0); 1142 reg |= DWC31_GRXTHRCFG_RXPKTCNT(rx_thr_num); 1143 1144 reg &= ~DWC31_GRXTHRCFG_MAXRXBURSTSIZE(~0); 1145 reg |= DWC31_GRXTHRCFG_MAXRXBURSTSIZE(rx_maxburst); 1146 1147 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg); 1148 } 1149 1150 if (tx_thr_num && tx_maxburst) { 1151 reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG); 1152 reg |= DWC31_GTXTHRCFG_PKTCNTSEL; 1153 1154 reg &= ~DWC31_GTXTHRCFG_TXPKTCNT(~0); 1155 reg |= DWC31_GTXTHRCFG_TXPKTCNT(tx_thr_num); 1156 1157 reg &= ~DWC31_GTXTHRCFG_MAXTXBURSTSIZE(~0); 1158 reg |= DWC31_GTXTHRCFG_MAXTXBURSTSIZE(tx_maxburst); 1159 1160 dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg); 1161 } 1162 } 1163} 1164 1165/** 1166 * dwc3_core_init - Low-level initialization of DWC3 Core 1167 * @dwc: Pointer to our controller context structure 1168 * 1169 * Returns 0 on success otherwise negative errno. 1170 */ 1171static int dwc3_core_init(struct dwc3 *dwc) 1172{ 1173 unsigned int hw_mode; 1174 u32 reg; 1175 int ret; 1176 1177 hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); 1178 1179 /* 1180 * Write Linux Version Code to our GUID register so it's easy to figure 1181 * out which kernel version a bug was found. 1182 */ 1183 dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE); 1184 1185 ret = dwc3_phy_setup(dwc); 1186 if (ret) 1187 return ret; 1188 1189 if (!dwc->ulpi_ready) { 1190 ret = dwc3_core_ulpi_init(dwc); 1191 if (ret) { 1192 if (ret == -ETIMEDOUT) { 1193 dwc3_core_soft_reset(dwc); 1194 ret = -EPROBE_DEFER; 1195 } 1196 return ret; 1197 } 1198 dwc->ulpi_ready = true; 1199 } 1200 1201 if (!dwc->phys_ready) { 1202 ret = dwc3_core_get_phy(dwc); 1203 if (ret) 1204 goto err_exit_ulpi; 1205 dwc->phys_ready = true; 1206 } 1207 1208 ret = dwc3_phy_init(dwc); 1209 if (ret) 1210 goto err_exit_ulpi; 1211 1212 ret = dwc3_core_soft_reset(dwc); 1213 if (ret) 1214 goto err_exit_phy; 1215 1216 if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD && 1217 !DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) { 1218 if (!dwc->dis_u3_susphy_quirk) { 1219 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)); 1220 reg |= DWC3_GUSB3PIPECTL_SUSPHY; 1221 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg); 1222 } 1223 1224 if (!dwc->dis_u2_susphy_quirk) { 1225 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 1226 reg |= DWC3_GUSB2PHYCFG_SUSPHY; 1227 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 1228 } 1229 } 1230 1231 dwc3_core_setup_global_control(dwc); 1232 dwc3_core_num_eps(dwc); 1233 1234 /* Set power down scale of suspend_clk */ 1235 dwc3_set_power_down_clk_scale(dwc); 1236 1237 /* Adjust Frame Length */ 1238 dwc3_frame_length_adjustment(dwc); 1239 1240 /* Adjust Reference Clock Period */ 1241 dwc3_ref_clk_period(dwc); 1242 1243 dwc3_set_incr_burst_type(dwc); 1244 1245 ret = dwc3_phy_power_on(dwc); 1246 if (ret) 1247 goto err_exit_phy; 1248 1249 ret = dwc3_event_buffers_setup(dwc); 1250 if (ret) { 1251 dev_err(dwc->dev, "failed to setup event buffers\n"); 1252 goto err_power_off_phy; 1253 } 1254 1255 /* 1256 * ENDXFER polling is available on version 3.10a and later of 1257 * the DWC_usb3 controller. It is NOT available in the 1258 * DWC_usb31 controller. 1259 */ 1260 if (DWC3_VER_IS_WITHIN(DWC3, 310A, ANY)) { 1261 reg = dwc3_readl(dwc->regs, DWC3_GUCTL2); 1262 reg |= DWC3_GUCTL2_RST_ACTBITLATER; 1263 dwc3_writel(dwc->regs, DWC3_GUCTL2, reg); 1264 } 1265 1266 /* 1267 * When configured in HOST mode, after issuing U3/L2 exit controller 1268 * fails to send proper CRC checksum in CRC5 feild. Because of this 1269 * behaviour Transaction Error is generated, resulting in reset and 1270 * re-enumeration of usb device attached. All the termsel, xcvrsel, 1271 * opmode becomes 0 during end of resume. Enabling bit 10 of GUCTL1 1272 * will correct this problem. This option is to support certain 1273 * legacy ULPI PHYs. 1274 */ 1275 if (dwc->resume_hs_terminations) { 1276 reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); 1277 reg |= DWC3_GUCTL1_RESUME_OPMODE_HS_HOST; 1278 dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); 1279 } 1280 1281 if (!DWC3_VER_IS_PRIOR(DWC3, 250A)) { 1282 reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); 1283 1284 /* 1285 * Enable hardware control of sending remote wakeup 1286 * in HS when the device is in the L1 state. 1287 */ 1288 if (!DWC3_VER_IS_PRIOR(DWC3, 290A)) 1289 reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW; 1290 1291 /* 1292 * Decouple USB 2.0 L1 & L2 events which will allow for 1293 * gadget driver to only receive U3/L2 suspend & wakeup 1294 * events and prevent the more frequent L1 LPM transitions 1295 * from interrupting the driver. 1296 */ 1297 if (!DWC3_VER_IS_PRIOR(DWC3, 300A)) 1298 reg |= DWC3_GUCTL1_DEV_DECOUPLE_L1L2_EVT; 1299 1300 if (dwc->dis_tx_ipgap_linecheck_quirk) 1301 reg |= DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS; 1302 1303 if (dwc->parkmode_disable_ss_quirk) 1304 reg |= DWC3_GUCTL1_PARKMODE_DISABLE_SS; 1305 1306 if (dwc->parkmode_disable_hs_quirk) 1307 reg |= DWC3_GUCTL1_PARKMODE_DISABLE_HS; 1308 1309 if (DWC3_VER_IS_WITHIN(DWC3, 290A, ANY) && 1310 (dwc->maximum_speed == USB_SPEED_HIGH || 1311 dwc->maximum_speed == USB_SPEED_FULL)) 1312 reg |= DWC3_GUCTL1_DEV_FORCE_20_CLK_FOR_30_CLK; 1313 1314 dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); 1315 } 1316 1317 dwc3_config_threshold(dwc); 1318 1319 return 0; 1320 1321err_power_off_phy: 1322 dwc3_phy_power_off(dwc); 1323err_exit_phy: 1324 dwc3_phy_exit(dwc); 1325err_exit_ulpi: 1326 dwc3_ulpi_exit(dwc); 1327 1328 return ret; 1329} 1330 1331static int dwc3_core_get_phy(struct dwc3 *dwc) 1332{ 1333 struct device *dev = dwc->dev; 1334 struct device_node *node = dev->of_node; 1335 int ret; 1336 1337 if (node) { 1338 dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0); 1339 dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1); 1340 } else { 1341 dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 1342 dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3); 1343 } 1344 1345 if (IS_ERR(dwc->usb2_phy)) { 1346 ret = PTR_ERR(dwc->usb2_phy); 1347 if (ret == -ENXIO || ret == -ENODEV) 1348 dwc->usb2_phy = NULL; 1349 else 1350 return dev_err_probe(dev, ret, "no usb2 phy configured\n"); 1351 } 1352 1353 if (IS_ERR(dwc->usb3_phy)) { 1354 ret = PTR_ERR(dwc->usb3_phy); 1355 if (ret == -ENXIO || ret == -ENODEV) 1356 dwc->usb3_phy = NULL; 1357 else 1358 return dev_err_probe(dev, ret, "no usb3 phy configured\n"); 1359 } 1360 1361 dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy"); 1362 if (IS_ERR(dwc->usb2_generic_phy)) { 1363 ret = PTR_ERR(dwc->usb2_generic_phy); 1364 if (ret == -ENOSYS || ret == -ENODEV) 1365 dwc->usb2_generic_phy = NULL; 1366 else 1367 return dev_err_probe(dev, ret, "no usb2 phy configured\n"); 1368 } 1369 1370 dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy"); 1371 if (IS_ERR(dwc->usb3_generic_phy)) { 1372 ret = PTR_ERR(dwc->usb3_generic_phy); 1373 if (ret == -ENOSYS || ret == -ENODEV) 1374 dwc->usb3_generic_phy = NULL; 1375 else 1376 return dev_err_probe(dev, ret, "no usb3 phy configured\n"); 1377 } 1378 1379 return 0; 1380} 1381 1382static int dwc3_core_init_mode(struct dwc3 *dwc) 1383{ 1384 struct device *dev = dwc->dev; 1385 int ret; 1386 1387 switch (dwc->dr_mode) { 1388 case USB_DR_MODE_PERIPHERAL: 1389 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE); 1390 1391 if (dwc->usb2_phy) 1392 otg_set_vbus(dwc->usb2_phy->otg, false); 1393 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE); 1394 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE); 1395 1396 ret = dwc3_gadget_init(dwc); 1397 if (ret) 1398 return dev_err_probe(dev, ret, "failed to initialize gadget\n"); 1399 break; 1400 case USB_DR_MODE_HOST: 1401 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); 1402 1403 if (dwc->usb2_phy) 1404 otg_set_vbus(dwc->usb2_phy->otg, true); 1405 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST); 1406 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST); 1407 1408 ret = dwc3_host_init(dwc); 1409 if (ret) 1410 return dev_err_probe(dev, ret, "failed to initialize host\n"); 1411 break; 1412 case USB_DR_MODE_OTG: 1413 INIT_WORK(&dwc->drd_work, __dwc3_set_mode); 1414 ret = dwc3_drd_init(dwc); 1415 if (ret) 1416 return dev_err_probe(dev, ret, "failed to initialize dual-role\n"); 1417 break; 1418 default: 1419 dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode); 1420 return -EINVAL; 1421 } 1422 1423 return 0; 1424} 1425 1426static void dwc3_core_exit_mode(struct dwc3 *dwc) 1427{ 1428 switch (dwc->dr_mode) { 1429 case USB_DR_MODE_PERIPHERAL: 1430 dwc3_gadget_exit(dwc); 1431 break; 1432 case USB_DR_MODE_HOST: 1433 dwc3_host_exit(dwc); 1434 break; 1435 case USB_DR_MODE_OTG: 1436 dwc3_drd_exit(dwc); 1437 break; 1438 default: 1439 /* do nothing */ 1440 break; 1441 } 1442 1443 /* de-assert DRVVBUS for HOST and OTG mode */ 1444 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE); 1445} 1446 1447static void dwc3_get_properties(struct dwc3 *dwc) 1448{ 1449 struct device *dev = dwc->dev; 1450 u8 lpm_nyet_threshold; 1451 u8 tx_de_emphasis; 1452 u8 hird_threshold; 1453 u8 rx_thr_num_pkt = 0; 1454 u8 rx_max_burst = 0; 1455 u8 tx_thr_num_pkt = 0; 1456 u8 tx_max_burst = 0; 1457 u8 rx_thr_num_pkt_prd = 0; 1458 u8 rx_max_burst_prd = 0; 1459 u8 tx_thr_num_pkt_prd = 0; 1460 u8 tx_max_burst_prd = 0; 1461 u8 tx_fifo_resize_max_num; 1462 const char *usb_psy_name; 1463 int ret; 1464 1465 /* default to highest possible threshold */ 1466 lpm_nyet_threshold = 0xf; 1467 1468 /* default to -3.5dB de-emphasis */ 1469 tx_de_emphasis = 1; 1470 1471 /* 1472 * default to assert utmi_sleep_n and use maximum allowed HIRD 1473 * threshold value of 0b1100 1474 */ 1475 hird_threshold = 12; 1476 1477 /* 1478 * default to a TXFIFO size large enough to fit 6 max packets. This 1479 * allows for systems with larger bus latencies to have some headroom 1480 * for endpoints that have a large bMaxBurst value. 1481 */ 1482 tx_fifo_resize_max_num = 6; 1483 1484 dwc->maximum_speed = usb_get_maximum_speed(dev); 1485 dwc->max_ssp_rate = usb_get_maximum_ssp_rate(dev); 1486 dwc->dr_mode = usb_get_dr_mode(dev); 1487 dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node); 1488 1489 dwc->sysdev_is_parent = device_property_read_bool(dev, 1490 "linux,sysdev_is_parent"); 1491 if (dwc->sysdev_is_parent) 1492 dwc->sysdev = dwc->dev->parent; 1493 else 1494 dwc->sysdev = dwc->dev; 1495 1496 ret = device_property_read_string(dev, "usb-psy-name", &usb_psy_name); 1497 if (ret >= 0) { 1498 dwc->usb_psy = power_supply_get_by_name(usb_psy_name); 1499 if (!dwc->usb_psy) 1500 dev_err(dev, "couldn't get usb power supply\n"); 1501 } 1502 1503 dwc->has_lpm_erratum = device_property_read_bool(dev, 1504 "snps,has-lpm-erratum"); 1505 device_property_read_u8(dev, "snps,lpm-nyet-threshold", 1506 &lpm_nyet_threshold); 1507 dwc->is_utmi_l1_suspend = device_property_read_bool(dev, 1508 "snps,is-utmi-l1-suspend"); 1509 device_property_read_u8(dev, "snps,hird-threshold", 1510 &hird_threshold); 1511 dwc->dis_start_transfer_quirk = device_property_read_bool(dev, 1512 "snps,dis-start-transfer-quirk"); 1513 dwc->usb3_lpm_capable = device_property_read_bool(dev, 1514 "snps,usb3_lpm_capable"); 1515 dwc->usb2_lpm_disable = device_property_read_bool(dev, 1516 "snps,usb2-lpm-disable"); 1517 dwc->usb2_gadget_lpm_disable = device_property_read_bool(dev, 1518 "snps,usb2-gadget-lpm-disable"); 1519 device_property_read_u8(dev, "snps,rx-thr-num-pkt", 1520 &rx_thr_num_pkt); 1521 device_property_read_u8(dev, "snps,rx-max-burst", 1522 &rx_max_burst); 1523 device_property_read_u8(dev, "snps,tx-thr-num-pkt", 1524 &tx_thr_num_pkt); 1525 device_property_read_u8(dev, "snps,tx-max-burst", 1526 &tx_max_burst); 1527 device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd", 1528 &rx_thr_num_pkt_prd); 1529 device_property_read_u8(dev, "snps,rx-max-burst-prd", 1530 &rx_max_burst_prd); 1531 device_property_read_u8(dev, "snps,tx-thr-num-pkt-prd", 1532 &tx_thr_num_pkt_prd); 1533 device_property_read_u8(dev, "snps,tx-max-burst-prd", 1534 &tx_max_burst_prd); 1535 dwc->do_fifo_resize = device_property_read_bool(dev, 1536 "tx-fifo-resize"); 1537 if (dwc->do_fifo_resize) 1538 device_property_read_u8(dev, "tx-fifo-max-num", 1539 &tx_fifo_resize_max_num); 1540 1541 dwc->disable_scramble_quirk = device_property_read_bool(dev, 1542 "snps,disable_scramble_quirk"); 1543 dwc->u2exit_lfps_quirk = device_property_read_bool(dev, 1544 "snps,u2exit_lfps_quirk"); 1545 dwc->u2ss_inp3_quirk = device_property_read_bool(dev, 1546 "snps,u2ss_inp3_quirk"); 1547 dwc->req_p1p2p3_quirk = device_property_read_bool(dev, 1548 "snps,req_p1p2p3_quirk"); 1549 dwc->del_p1p2p3_quirk = device_property_read_bool(dev, 1550 "snps,del_p1p2p3_quirk"); 1551 dwc->del_phy_power_chg_quirk = device_property_read_bool(dev, 1552 "snps,del_phy_power_chg_quirk"); 1553 dwc->lfps_filter_quirk = device_property_read_bool(dev, 1554 "snps,lfps_filter_quirk"); 1555 dwc->rx_detect_poll_quirk = device_property_read_bool(dev, 1556 "snps,rx_detect_poll_quirk"); 1557 dwc->dis_u3_susphy_quirk = device_property_read_bool(dev, 1558 "snps,dis_u3_susphy_quirk"); 1559 dwc->dis_u2_susphy_quirk = device_property_read_bool(dev, 1560 "snps,dis_u2_susphy_quirk"); 1561 dwc->dis_enblslpm_quirk = device_property_read_bool(dev, 1562 "snps,dis_enblslpm_quirk"); 1563 dwc->dis_u1_entry_quirk = device_property_read_bool(dev, 1564 "snps,dis-u1-entry-quirk"); 1565 dwc->dis_u2_entry_quirk = device_property_read_bool(dev, 1566 "snps,dis-u2-entry-quirk"); 1567 dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev, 1568 "snps,dis_rxdet_inp3_quirk"); 1569 dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev, 1570 "snps,dis-u2-freeclk-exists-quirk"); 1571 dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev, 1572 "snps,dis-del-phy-power-chg-quirk"); 1573 dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev, 1574 "snps,dis-tx-ipgap-linecheck-quirk"); 1575 dwc->resume_hs_terminations = device_property_read_bool(dev, 1576 "snps,resume-hs-terminations"); 1577 dwc->ulpi_ext_vbus_drv = device_property_read_bool(dev, 1578 "snps,ulpi-ext-vbus-drv"); 1579 dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev, 1580 "snps,parkmode-disable-ss-quirk"); 1581 dwc->parkmode_disable_hs_quirk = device_property_read_bool(dev, 1582 "snps,parkmode-disable-hs-quirk"); 1583 dwc->gfladj_refclk_lpm_sel = device_property_read_bool(dev, 1584 "snps,gfladj-refclk-lpm-sel-quirk"); 1585 1586 dwc->tx_de_emphasis_quirk = device_property_read_bool(dev, 1587 "snps,tx_de_emphasis_quirk"); 1588 device_property_read_u8(dev, "snps,tx_de_emphasis", 1589 &tx_de_emphasis); 1590 device_property_read_string(dev, "snps,hsphy_interface", 1591 &dwc->hsphy_interface); 1592 device_property_read_u32(dev, "snps,quirk-frame-length-adjustment", 1593 &dwc->fladj); 1594 device_property_read_u32(dev, "snps,ref-clock-period-ns", 1595 &dwc->ref_clk_per); 1596 1597 dwc->dis_metastability_quirk = device_property_read_bool(dev, 1598 "snps,dis_metastability_quirk"); 1599 1600 dwc->dis_split_quirk = device_property_read_bool(dev, 1601 "snps,dis-split-quirk"); 1602 1603 dwc->lpm_nyet_threshold = lpm_nyet_threshold; 1604 dwc->tx_de_emphasis = tx_de_emphasis; 1605 1606 dwc->hird_threshold = hird_threshold; 1607 1608 dwc->rx_thr_num_pkt = rx_thr_num_pkt; 1609 dwc->rx_max_burst = rx_max_burst; 1610 1611 dwc->tx_thr_num_pkt = tx_thr_num_pkt; 1612 dwc->tx_max_burst = tx_max_burst; 1613 1614 dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd; 1615 dwc->rx_max_burst_prd = rx_max_burst_prd; 1616 1617 dwc->tx_thr_num_pkt_prd = tx_thr_num_pkt_prd; 1618 dwc->tx_max_burst_prd = tx_max_burst_prd; 1619 1620 dwc->imod_interval = 0; 1621 1622 dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num; 1623} 1624 1625/* check whether the core supports IMOD */ 1626bool dwc3_has_imod(struct dwc3 *dwc) 1627{ 1628 return DWC3_VER_IS_WITHIN(DWC3, 300A, ANY) || 1629 DWC3_VER_IS_WITHIN(DWC31, 120A, ANY) || 1630 DWC3_IP_IS(DWC32); 1631} 1632 1633static void dwc3_check_params(struct dwc3 *dwc) 1634{ 1635 struct device *dev = dwc->dev; 1636 unsigned int hwparam_gen = 1637 DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3); 1638 1639 /* Check for proper value of imod_interval */ 1640 if (dwc->imod_interval && !dwc3_has_imod(dwc)) { 1641 dev_warn(dwc->dev, "Interrupt moderation not supported\n"); 1642 dwc->imod_interval = 0; 1643 } 1644 1645 /* 1646 * Workaround for STAR 9000961433 which affects only version 1647 * 3.00a of the DWC_usb3 core. This prevents the controller 1648 * interrupt from being masked while handling events. IMOD 1649 * allows us to work around this issue. Enable it for the 1650 * affected version. 1651 */ 1652 if (!dwc->imod_interval && 1653 DWC3_VER_IS(DWC3, 300A)) 1654 dwc->imod_interval = 1; 1655 1656 /* Check the maximum_speed parameter */ 1657 switch (dwc->maximum_speed) { 1658 case USB_SPEED_FULL: 1659 case USB_SPEED_HIGH: 1660 break; 1661 case USB_SPEED_SUPER: 1662 if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS) 1663 dev_warn(dev, "UDC doesn't support Gen 1\n"); 1664 break; 1665 case USB_SPEED_SUPER_PLUS: 1666 if ((DWC3_IP_IS(DWC32) && 1667 hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS) || 1668 (!DWC3_IP_IS(DWC32) && 1669 hwparam_gen != DWC3_GHWPARAMS3_SSPHY_IFC_GEN2)) 1670 dev_warn(dev, "UDC doesn't support SSP\n"); 1671 break; 1672 default: 1673 dev_err(dev, "invalid maximum_speed parameter %d\n", 1674 dwc->maximum_speed); 1675 fallthrough; 1676 case USB_SPEED_UNKNOWN: 1677 switch (hwparam_gen) { 1678 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2: 1679 dwc->maximum_speed = USB_SPEED_SUPER_PLUS; 1680 break; 1681 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1: 1682 if (DWC3_IP_IS(DWC32)) 1683 dwc->maximum_speed = USB_SPEED_SUPER_PLUS; 1684 else 1685 dwc->maximum_speed = USB_SPEED_SUPER; 1686 break; 1687 case DWC3_GHWPARAMS3_SSPHY_IFC_DIS: 1688 dwc->maximum_speed = USB_SPEED_HIGH; 1689 break; 1690 default: 1691 dwc->maximum_speed = USB_SPEED_SUPER; 1692 break; 1693 } 1694 break; 1695 } 1696 1697 /* 1698 * Currently the controller does not have visibility into the HW 1699 * parameter to determine the maximum number of lanes the HW supports. 1700 * If the number of lanes is not specified in the device property, then 1701 * set the default to support dual-lane for DWC_usb32 and single-lane 1702 * for DWC_usb31 for super-speed-plus. 1703 */ 1704 if (dwc->maximum_speed == USB_SPEED_SUPER_PLUS) { 1705 switch (dwc->max_ssp_rate) { 1706 case USB_SSP_GEN_2x1: 1707 if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_GEN1) 1708 dev_warn(dev, "UDC only supports Gen 1\n"); 1709 break; 1710 case USB_SSP_GEN_1x2: 1711 case USB_SSP_GEN_2x2: 1712 if (DWC3_IP_IS(DWC31)) 1713 dev_warn(dev, "UDC only supports single lane\n"); 1714 break; 1715 case USB_SSP_GEN_UNKNOWN: 1716 default: 1717 switch (hwparam_gen) { 1718 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2: 1719 if (DWC3_IP_IS(DWC32)) 1720 dwc->max_ssp_rate = USB_SSP_GEN_2x2; 1721 else 1722 dwc->max_ssp_rate = USB_SSP_GEN_2x1; 1723 break; 1724 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1: 1725 if (DWC3_IP_IS(DWC32)) 1726 dwc->max_ssp_rate = USB_SSP_GEN_1x2; 1727 break; 1728 } 1729 break; 1730 } 1731 } 1732} 1733 1734static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc) 1735{ 1736 struct device *dev = dwc->dev; 1737 struct device_node *np_phy; 1738 struct extcon_dev *edev = NULL; 1739 const char *name; 1740 1741 if (device_property_read_bool(dev, "extcon")) 1742 return extcon_get_edev_by_phandle(dev, 0); 1743 1744 /* 1745 * Device tree platforms should get extcon via phandle. 1746 * On ACPI platforms, we get the name from a device property. 1747 * This device property is for kernel internal use only and 1748 * is expected to be set by the glue code. 1749 */ 1750 if (device_property_read_string(dev, "linux,extcon-name", &name) == 0) 1751 return extcon_get_extcon_dev(name); 1752 1753 /* 1754 * Check explicitly if "usb-role-switch" is used since 1755 * extcon_find_edev_by_node() can not be used to check the absence of 1756 * an extcon device. In the absence of an device it will always return 1757 * EPROBE_DEFER. 1758 */ 1759 if (IS_ENABLED(CONFIG_USB_ROLE_SWITCH) && 1760 device_property_read_bool(dev, "usb-role-switch")) 1761 return NULL; 1762 1763 /* 1764 * Try to get an extcon device from the USB PHY controller's "port" 1765 * node. Check if it has the "port" node first, to avoid printing the 1766 * error message from underlying code, as it's a valid case: extcon 1767 * device (and "port" node) may be missing in case of "usb-role-switch" 1768 * or OTG mode. 1769 */ 1770 np_phy = of_parse_phandle(dev->of_node, "phys", 0); 1771 if (of_graph_is_present(np_phy)) { 1772 struct device_node *np_conn; 1773 1774 np_conn = of_graph_get_remote_node(np_phy, -1, -1); 1775 if (np_conn) 1776 edev = extcon_find_edev_by_node(np_conn); 1777 of_node_put(np_conn); 1778 } 1779 of_node_put(np_phy); 1780 1781 return edev; 1782} 1783 1784static int dwc3_get_clocks(struct dwc3 *dwc) 1785{ 1786 struct device *dev = dwc->dev; 1787 1788 if (!dev->of_node) 1789 return 0; 1790 1791 /* 1792 * Clocks are optional, but new DT platforms should support all clocks 1793 * as required by the DT-binding. 1794 * Some devices have different clock names in legacy device trees, 1795 * check for them to retain backwards compatibility. 1796 */ 1797 dwc->bus_clk = devm_clk_get_optional(dev, "bus_early"); 1798 if (IS_ERR(dwc->bus_clk)) { 1799 return dev_err_probe(dev, PTR_ERR(dwc->bus_clk), 1800 "could not get bus clock\n"); 1801 } 1802 1803 if (dwc->bus_clk == NULL) { 1804 dwc->bus_clk = devm_clk_get_optional(dev, "bus_clk"); 1805 if (IS_ERR(dwc->bus_clk)) { 1806 return dev_err_probe(dev, PTR_ERR(dwc->bus_clk), 1807 "could not get bus clock\n"); 1808 } 1809 } 1810 1811 dwc->ref_clk = devm_clk_get_optional(dev, "ref"); 1812 if (IS_ERR(dwc->ref_clk)) { 1813 return dev_err_probe(dev, PTR_ERR(dwc->ref_clk), 1814 "could not get ref clock\n"); 1815 } 1816 1817 if (dwc->ref_clk == NULL) { 1818 dwc->ref_clk = devm_clk_get_optional(dev, "ref_clk"); 1819 if (IS_ERR(dwc->ref_clk)) { 1820 return dev_err_probe(dev, PTR_ERR(dwc->ref_clk), 1821 "could not get ref clock\n"); 1822 } 1823 } 1824 1825 dwc->susp_clk = devm_clk_get_optional(dev, "suspend"); 1826 if (IS_ERR(dwc->susp_clk)) { 1827 return dev_err_probe(dev, PTR_ERR(dwc->susp_clk), 1828 "could not get suspend clock\n"); 1829 } 1830 1831 if (dwc->susp_clk == NULL) { 1832 dwc->susp_clk = devm_clk_get_optional(dev, "suspend_clk"); 1833 if (IS_ERR(dwc->susp_clk)) { 1834 return dev_err_probe(dev, PTR_ERR(dwc->susp_clk), 1835 "could not get suspend clock\n"); 1836 } 1837 } 1838 1839 return 0; 1840} 1841 1842static int dwc3_probe(struct platform_device *pdev) 1843{ 1844 struct device *dev = &pdev->dev; 1845 struct resource *res, dwc_res; 1846 void __iomem *regs; 1847 struct dwc3 *dwc; 1848 int ret; 1849 1850 dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL); 1851 if (!dwc) 1852 return -ENOMEM; 1853 1854 dwc->dev = dev; 1855 1856 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1857 if (!res) { 1858 dev_err(dev, "missing memory resource\n"); 1859 return -ENODEV; 1860 } 1861 1862 dwc->xhci_resources[0].start = res->start; 1863 dwc->xhci_resources[0].end = dwc->xhci_resources[0].start + 1864 DWC3_XHCI_REGS_END; 1865 dwc->xhci_resources[0].flags = res->flags; 1866 dwc->xhci_resources[0].name = res->name; 1867 1868 /* 1869 * Request memory region but exclude xHCI regs, 1870 * since it will be requested by the xhci-plat driver. 1871 */ 1872 dwc_res = *res; 1873 dwc_res.start += DWC3_GLOBALS_REGS_START; 1874 1875 if (dev->of_node) { 1876 struct device_node *parent = of_get_parent(dev->of_node); 1877 1878 if (of_device_is_compatible(parent, "realtek,rtd-dwc3")) { 1879 dwc_res.start -= DWC3_GLOBALS_REGS_START; 1880 dwc_res.start += DWC3_RTK_RTD_GLOBALS_REGS_START; 1881 } 1882 1883 of_node_put(parent); 1884 } 1885 1886 regs = devm_ioremap_resource(dev, &dwc_res); 1887 if (IS_ERR(regs)) 1888 return PTR_ERR(regs); 1889 1890 dwc->regs = regs; 1891 dwc->regs_size = resource_size(&dwc_res); 1892 1893 dwc3_get_properties(dwc); 1894 1895 dwc->reset = devm_reset_control_array_get_optional_shared(dev); 1896 if (IS_ERR(dwc->reset)) { 1897 ret = PTR_ERR(dwc->reset); 1898 goto err_put_psy; 1899 } 1900 1901 ret = dwc3_get_clocks(dwc); 1902 if (ret) 1903 goto err_put_psy; 1904 1905 ret = reset_control_deassert(dwc->reset); 1906 if (ret) 1907 goto err_put_psy; 1908 1909 ret = dwc3_clk_enable(dwc); 1910 if (ret) 1911 goto err_assert_reset; 1912 1913 if (!dwc3_core_is_valid(dwc)) { 1914 dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n"); 1915 ret = -ENODEV; 1916 goto err_disable_clks; 1917 } 1918 1919 platform_set_drvdata(pdev, dwc); 1920 dwc3_cache_hwparams(dwc); 1921 1922 if (!dwc->sysdev_is_parent && 1923 DWC3_GHWPARAMS0_AWIDTH(dwc->hwparams.hwparams0) == 64) { 1924 ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64)); 1925 if (ret) 1926 goto err_disable_clks; 1927 } 1928 1929 spin_lock_init(&dwc->lock); 1930 mutex_init(&dwc->mutex); 1931 1932 pm_runtime_get_noresume(dev); 1933 pm_runtime_set_active(dev); 1934 pm_runtime_use_autosuspend(dev); 1935 pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY); 1936 pm_runtime_enable(dev); 1937 1938 pm_runtime_forbid(dev); 1939 1940 ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE); 1941 if (ret) { 1942 dev_err(dwc->dev, "failed to allocate event buffers\n"); 1943 ret = -ENOMEM; 1944 goto err_allow_rpm; 1945 } 1946 1947 dwc->edev = dwc3_get_extcon(dwc); 1948 if (IS_ERR(dwc->edev)) { 1949 ret = dev_err_probe(dwc->dev, PTR_ERR(dwc->edev), "failed to get extcon\n"); 1950 goto err_free_event_buffers; 1951 } 1952 1953 ret = dwc3_get_dr_mode(dwc); 1954 if (ret) 1955 goto err_free_event_buffers; 1956 1957 ret = dwc3_core_init(dwc); 1958 if (ret) { 1959 dev_err_probe(dev, ret, "failed to initialize core\n"); 1960 goto err_free_event_buffers; 1961 } 1962 1963 dwc3_check_params(dwc); 1964 dwc3_debugfs_init(dwc); 1965 1966 ret = dwc3_core_init_mode(dwc); 1967 if (ret) 1968 goto err_exit_debugfs; 1969 1970 pm_runtime_put(dev); 1971 1972 dma_set_max_seg_size(dev, UINT_MAX); 1973 1974 return 0; 1975 1976err_exit_debugfs: 1977 dwc3_debugfs_exit(dwc); 1978 dwc3_event_buffers_cleanup(dwc); 1979 dwc3_phy_power_off(dwc); 1980 dwc3_phy_exit(dwc); 1981 dwc3_ulpi_exit(dwc); 1982err_free_event_buffers: 1983 dwc3_free_event_buffers(dwc); 1984err_allow_rpm: 1985 pm_runtime_allow(dev); 1986 pm_runtime_disable(dev); 1987 pm_runtime_dont_use_autosuspend(dev); 1988 pm_runtime_set_suspended(dev); 1989 pm_runtime_put_noidle(dev); 1990err_disable_clks: 1991 dwc3_clk_disable(dwc); 1992err_assert_reset: 1993 reset_control_assert(dwc->reset); 1994err_put_psy: 1995 if (dwc->usb_psy) 1996 power_supply_put(dwc->usb_psy); 1997 1998 return ret; 1999} 2000 2001static void dwc3_remove(struct platform_device *pdev) 2002{ 2003 struct dwc3 *dwc = platform_get_drvdata(pdev); 2004 2005 pm_runtime_get_sync(&pdev->dev); 2006 2007 dwc3_core_exit_mode(dwc); 2008 dwc3_debugfs_exit(dwc); 2009 2010 dwc3_core_exit(dwc); 2011 dwc3_ulpi_exit(dwc); 2012 2013 pm_runtime_allow(&pdev->dev); 2014 pm_runtime_disable(&pdev->dev); 2015 pm_runtime_dont_use_autosuspend(&pdev->dev); 2016 pm_runtime_put_noidle(&pdev->dev); 2017 /* 2018 * HACK: Clear the driver data, which is currently accessed by parent 2019 * glue drivers, before allowing the parent to suspend. 2020 */ 2021 platform_set_drvdata(pdev, NULL); 2022 pm_runtime_set_suspended(&pdev->dev); 2023 2024 dwc3_free_event_buffers(dwc); 2025 2026 if (dwc->usb_psy) 2027 power_supply_put(dwc->usb_psy); 2028} 2029 2030#ifdef CONFIG_PM 2031static int dwc3_core_init_for_resume(struct dwc3 *dwc) 2032{ 2033 int ret; 2034 2035 ret = reset_control_deassert(dwc->reset); 2036 if (ret) 2037 return ret; 2038 2039 ret = dwc3_clk_enable(dwc); 2040 if (ret) 2041 goto assert_reset; 2042 2043 ret = dwc3_core_init(dwc); 2044 if (ret) 2045 goto disable_clks; 2046 2047 return 0; 2048 2049disable_clks: 2050 dwc3_clk_disable(dwc); 2051assert_reset: 2052 reset_control_assert(dwc->reset); 2053 2054 return ret; 2055} 2056 2057static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) 2058{ 2059 unsigned long flags; 2060 u32 reg; 2061 2062 switch (dwc->current_dr_role) { 2063 case DWC3_GCTL_PRTCAP_DEVICE: 2064 if (pm_runtime_suspended(dwc->dev)) 2065 break; 2066 dwc3_gadget_suspend(dwc); 2067 synchronize_irq(dwc->irq_gadget); 2068 dwc3_core_exit(dwc); 2069 break; 2070 case DWC3_GCTL_PRTCAP_HOST: 2071 if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) { 2072 dwc3_core_exit(dwc); 2073 break; 2074 } 2075 2076 /* Let controller to suspend HSPHY before PHY driver suspends */ 2077 if (dwc->dis_u2_susphy_quirk || 2078 dwc->dis_enblslpm_quirk) { 2079 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 2080 reg |= DWC3_GUSB2PHYCFG_ENBLSLPM | 2081 DWC3_GUSB2PHYCFG_SUSPHY; 2082 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 2083 2084 /* Give some time for USB2 PHY to suspend */ 2085 usleep_range(5000, 6000); 2086 } 2087 2088 phy_pm_runtime_put_sync(dwc->usb2_generic_phy); 2089 phy_pm_runtime_put_sync(dwc->usb3_generic_phy); 2090 break; 2091 case DWC3_GCTL_PRTCAP_OTG: 2092 /* do nothing during runtime_suspend */ 2093 if (PMSG_IS_AUTO(msg)) 2094 break; 2095 2096 if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) { 2097 spin_lock_irqsave(&dwc->lock, flags); 2098 dwc3_gadget_suspend(dwc); 2099 spin_unlock_irqrestore(&dwc->lock, flags); 2100 synchronize_irq(dwc->irq_gadget); 2101 } 2102 2103 dwc3_otg_exit(dwc); 2104 dwc3_core_exit(dwc); 2105 break; 2106 default: 2107 /* do nothing */ 2108 break; 2109 } 2110 2111 return 0; 2112} 2113 2114static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) 2115{ 2116 unsigned long flags; 2117 int ret; 2118 u32 reg; 2119 2120 switch (dwc->current_dr_role) { 2121 case DWC3_GCTL_PRTCAP_DEVICE: 2122 ret = dwc3_core_init_for_resume(dwc); 2123 if (ret) 2124 return ret; 2125 2126 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE); 2127 dwc3_gadget_resume(dwc); 2128 break; 2129 case DWC3_GCTL_PRTCAP_HOST: 2130 if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) { 2131 ret = dwc3_core_init_for_resume(dwc); 2132 if (ret) 2133 return ret; 2134 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); 2135 break; 2136 } 2137 /* Restore GUSB2PHYCFG bits that were modified in suspend */ 2138 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 2139 if (dwc->dis_u2_susphy_quirk) 2140 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; 2141 2142 if (dwc->dis_enblslpm_quirk) 2143 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM; 2144 2145 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 2146 2147 phy_pm_runtime_get_sync(dwc->usb2_generic_phy); 2148 phy_pm_runtime_get_sync(dwc->usb3_generic_phy); 2149 break; 2150 case DWC3_GCTL_PRTCAP_OTG: 2151 /* nothing to do on runtime_resume */ 2152 if (PMSG_IS_AUTO(msg)) 2153 break; 2154 2155 ret = dwc3_core_init_for_resume(dwc); 2156 if (ret) 2157 return ret; 2158 2159 dwc3_set_prtcap(dwc, dwc->current_dr_role); 2160 2161 dwc3_otg_init(dwc); 2162 if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST) { 2163 dwc3_otg_host_init(dwc); 2164 } else if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) { 2165 spin_lock_irqsave(&dwc->lock, flags); 2166 dwc3_gadget_resume(dwc); 2167 spin_unlock_irqrestore(&dwc->lock, flags); 2168 } 2169 2170 break; 2171 default: 2172 /* do nothing */ 2173 break; 2174 } 2175 2176 return 0; 2177} 2178 2179static int dwc3_runtime_checks(struct dwc3 *dwc) 2180{ 2181 switch (dwc->current_dr_role) { 2182 case DWC3_GCTL_PRTCAP_DEVICE: 2183 if (dwc->connected) 2184 return -EBUSY; 2185 break; 2186 case DWC3_GCTL_PRTCAP_HOST: 2187 default: 2188 /* do nothing */ 2189 break; 2190 } 2191 2192 return 0; 2193} 2194 2195static int dwc3_runtime_suspend(struct device *dev) 2196{ 2197 struct dwc3 *dwc = dev_get_drvdata(dev); 2198 int ret; 2199 2200 if (dwc3_runtime_checks(dwc)) 2201 return -EBUSY; 2202 2203 ret = dwc3_suspend_common(dwc, PMSG_AUTO_SUSPEND); 2204 if (ret) 2205 return ret; 2206 2207 return 0; 2208} 2209 2210static int dwc3_runtime_resume(struct device *dev) 2211{ 2212 struct dwc3 *dwc = dev_get_drvdata(dev); 2213 int ret; 2214 2215 ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME); 2216 if (ret) 2217 return ret; 2218 2219 switch (dwc->current_dr_role) { 2220 case DWC3_GCTL_PRTCAP_DEVICE: 2221 dwc3_gadget_process_pending_events(dwc); 2222 break; 2223 case DWC3_GCTL_PRTCAP_HOST: 2224 default: 2225 /* do nothing */ 2226 break; 2227 } 2228 2229 pm_runtime_mark_last_busy(dev); 2230 2231 return 0; 2232} 2233 2234static int dwc3_runtime_idle(struct device *dev) 2235{ 2236 struct dwc3 *dwc = dev_get_drvdata(dev); 2237 2238 switch (dwc->current_dr_role) { 2239 case DWC3_GCTL_PRTCAP_DEVICE: 2240 if (dwc3_runtime_checks(dwc)) 2241 return -EBUSY; 2242 break; 2243 case DWC3_GCTL_PRTCAP_HOST: 2244 default: 2245 /* do nothing */ 2246 break; 2247 } 2248 2249 pm_runtime_mark_last_busy(dev); 2250 pm_runtime_autosuspend(dev); 2251 2252 return 0; 2253} 2254#endif /* CONFIG_PM */ 2255 2256#ifdef CONFIG_PM_SLEEP 2257static int dwc3_suspend(struct device *dev) 2258{ 2259 struct dwc3 *dwc = dev_get_drvdata(dev); 2260 int ret; 2261 2262 ret = dwc3_suspend_common(dwc, PMSG_SUSPEND); 2263 if (ret) 2264 return ret; 2265 2266 pinctrl_pm_select_sleep_state(dev); 2267 2268 return 0; 2269} 2270 2271static int dwc3_resume(struct device *dev) 2272{ 2273 struct dwc3 *dwc = dev_get_drvdata(dev); 2274 int ret; 2275 2276 pinctrl_pm_select_default_state(dev); 2277 2278 ret = dwc3_resume_common(dwc, PMSG_RESUME); 2279 if (ret) 2280 return ret; 2281 2282 pm_runtime_disable(dev); 2283 pm_runtime_set_active(dev); 2284 pm_runtime_enable(dev); 2285 2286 return 0; 2287} 2288 2289static void dwc3_complete(struct device *dev) 2290{ 2291 struct dwc3 *dwc = dev_get_drvdata(dev); 2292 u32 reg; 2293 2294 if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST && 2295 dwc->dis_split_quirk) { 2296 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3); 2297 reg |= DWC3_GUCTL3_SPLITDISABLE; 2298 dwc3_writel(dwc->regs, DWC3_GUCTL3, reg); 2299 } 2300} 2301#else 2302#define dwc3_complete NULL 2303#endif /* CONFIG_PM_SLEEP */ 2304 2305static const struct dev_pm_ops dwc3_dev_pm_ops = { 2306 SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume) 2307 .complete = dwc3_complete, 2308 SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume, 2309 dwc3_runtime_idle) 2310}; 2311 2312#ifdef CONFIG_OF 2313static const struct of_device_id of_dwc3_match[] = { 2314 { 2315 .compatible = "snps,dwc3" 2316 }, 2317 { 2318 .compatible = "synopsys,dwc3" 2319 }, 2320 { }, 2321}; 2322MODULE_DEVICE_TABLE(of, of_dwc3_match); 2323#endif 2324 2325#ifdef CONFIG_ACPI 2326 2327#define ACPI_ID_INTEL_BSW "808622B7" 2328 2329static const struct acpi_device_id dwc3_acpi_match[] = { 2330 { ACPI_ID_INTEL_BSW, 0 }, 2331 { }, 2332}; 2333MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match); 2334#endif 2335 2336static struct platform_driver dwc3_driver = { 2337 .probe = dwc3_probe, 2338 .remove_new = dwc3_remove, 2339 .driver = { 2340 .name = "dwc3", 2341 .of_match_table = of_match_ptr(of_dwc3_match), 2342 .acpi_match_table = ACPI_PTR(dwc3_acpi_match), 2343 .pm = &dwc3_dev_pm_ops, 2344 }, 2345}; 2346 2347module_platform_driver(dwc3_driver); 2348 2349MODULE_ALIAS("platform:dwc3"); 2350MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 2351MODULE_LICENSE("GPL v2"); 2352MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver"); 2353