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/acpi.h> 27 #include <linux/pinctrl/consumer.h> 28 #include <linux/reset.h> 29 30 #include <linux/usb/ch9.h> 31 #include <linux/usb/gadget.h> 32 #include <linux/usb/of.h> 33 #include <linux/usb/otg.h> 34 35 #include "core.h" 36 #include "gadget.h" 37 #include "io.h" 38 39 #include "debug.h" 40 41 #define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */ 42 43 /** 44 * dwc3_get_dr_mode - Validates and sets dr_mode 45 * @dwc: pointer to our context structure 46 */ 47 static int dwc3_get_dr_mode(struct dwc3 *dwc) 48 { 49 enum usb_dr_mode mode; 50 struct device *dev = dwc->dev; 51 unsigned int hw_mode; 52 53 if (dwc->dr_mode == USB_DR_MODE_UNKNOWN) 54 dwc->dr_mode = USB_DR_MODE_OTG; 55 56 mode = dwc->dr_mode; 57 hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); 58 59 switch (hw_mode) { 60 case DWC3_GHWPARAMS0_MODE_GADGET: 61 if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) { 62 dev_err(dev, 63 "Controller does not support host mode.\n"); 64 return -EINVAL; 65 } 66 mode = USB_DR_MODE_PERIPHERAL; 67 break; 68 case DWC3_GHWPARAMS0_MODE_HOST: 69 if (IS_ENABLED(CONFIG_USB_DWC3_GADGET)) { 70 dev_err(dev, 71 "Controller does not support device mode.\n"); 72 return -EINVAL; 73 } 74 mode = USB_DR_MODE_HOST; 75 break; 76 default: 77 if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) 78 mode = USB_DR_MODE_HOST; 79 else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET)) 80 mode = USB_DR_MODE_PERIPHERAL; 81 82 /* 83 * DWC_usb31 and DWC_usb3 v3.30a and higher do not support OTG 84 * mode. If the controller supports DRD but the dr_mode is not 85 * specified or set to OTG, then set the mode to peripheral. 86 */ 87 if (mode == USB_DR_MODE_OTG && 88 (!IS_ENABLED(CONFIG_USB_ROLE_SWITCH) || 89 !device_property_read_bool(dwc->dev, "usb-role-switch")) && 90 !DWC3_VER_IS_PRIOR(DWC3, 330A)) 91 mode = USB_DR_MODE_PERIPHERAL; 92 } 93 94 if (mode != dwc->dr_mode) { 95 dev_warn(dev, 96 "Configuration mismatch. dr_mode forced to %s\n", 97 mode == USB_DR_MODE_HOST ? "host" : "gadget"); 98 99 dwc->dr_mode = mode; 100 } 101 102 return 0; 103 } 104 105 void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode) 106 { 107 u32 reg; 108 109 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 110 reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG)); 111 reg |= DWC3_GCTL_PRTCAPDIR(mode); 112 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 113 114 dwc->current_dr_role = mode; 115 } 116 117 static int dwc3_core_soft_reset(struct dwc3 *dwc); 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; 125 126 mutex_lock(&dwc->mutex); 127 128 pm_runtime_get_sync(dwc->dev); 129 130 if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG) 131 dwc3_otg_update(dwc, 0); 132 133 if (!dwc->desired_dr_role) 134 goto out; 135 136 if (dwc->desired_dr_role == dwc->current_dr_role) 137 goto out; 138 139 if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev) 140 goto out; 141 142 switch (dwc->current_dr_role) { 143 case DWC3_GCTL_PRTCAP_HOST: 144 dwc3_host_exit(dwc); 145 break; 146 case DWC3_GCTL_PRTCAP_DEVICE: 147 dwc3_gadget_exit(dwc); 148 dwc3_event_buffers_cleanup(dwc); 149 break; 150 case DWC3_GCTL_PRTCAP_OTG: 151 dwc3_otg_exit(dwc); 152 spin_lock_irqsave(&dwc->lock, flags); 153 dwc->desired_otg_role = DWC3_OTG_ROLE_IDLE; 154 spin_unlock_irqrestore(&dwc->lock, flags); 155 dwc3_otg_update(dwc, 1); 156 break; 157 default: 158 break; 159 } 160 161 /* For DRD host or device mode only */ 162 if (dwc->desired_dr_role != DWC3_GCTL_PRTCAP_OTG) { 163 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 164 reg |= DWC3_GCTL_CORESOFTRESET; 165 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 166 167 /* 168 * Wait for internal clocks to synchronized. DWC_usb31 and 169 * DWC_usb32 may need at least 50ms (less for DWC_usb3). To 170 * keep it consistent across different IPs, let's wait up to 171 * 100ms before clearing GCTL.CORESOFTRESET. 172 */ 173 msleep(100); 174 175 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 176 reg &= ~DWC3_GCTL_CORESOFTRESET; 177 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 178 } 179 180 spin_lock_irqsave(&dwc->lock, flags); 181 182 dwc3_set_prtcap(dwc, dwc->desired_dr_role); 183 184 spin_unlock_irqrestore(&dwc->lock, flags); 185 186 switch (dwc->desired_dr_role) { 187 case DWC3_GCTL_PRTCAP_HOST: 188 ret = dwc3_host_init(dwc); 189 if (ret) { 190 dev_err(dwc->dev, "failed to initialize host\n"); 191 } else { 192 if (dwc->usb2_phy) 193 otg_set_vbus(dwc->usb2_phy->otg, true); 194 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST); 195 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST); 196 if (dwc->dis_split_quirk) { 197 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3); 198 reg |= DWC3_GUCTL3_SPLITDISABLE; 199 dwc3_writel(dwc->regs, DWC3_GUCTL3, reg); 200 } 201 } 202 break; 203 case DWC3_GCTL_PRTCAP_DEVICE: 204 dwc3_core_soft_reset(dwc); 205 206 dwc3_event_buffers_setup(dwc); 207 208 if (dwc->usb2_phy) 209 otg_set_vbus(dwc->usb2_phy->otg, false); 210 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE); 211 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE); 212 213 ret = dwc3_gadget_init(dwc); 214 if (ret) 215 dev_err(dwc->dev, "failed to initialize peripheral\n"); 216 break; 217 case DWC3_GCTL_PRTCAP_OTG: 218 dwc3_otg_init(dwc); 219 dwc3_otg_update(dwc, 0); 220 break; 221 default: 222 break; 223 } 224 225 out: 226 pm_runtime_mark_last_busy(dwc->dev); 227 pm_runtime_put_autosuspend(dwc->dev); 228 mutex_unlock(&dwc->mutex); 229 } 230 231 void dwc3_set_mode(struct dwc3 *dwc, u32 mode) 232 { 233 unsigned long flags; 234 235 if (dwc->dr_mode != USB_DR_MODE_OTG) 236 return; 237 238 spin_lock_irqsave(&dwc->lock, flags); 239 dwc->desired_dr_role = mode; 240 spin_unlock_irqrestore(&dwc->lock, flags); 241 242 queue_work(system_freezable_wq, &dwc->drd_work); 243 } 244 245 u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type) 246 { 247 struct dwc3 *dwc = dep->dwc; 248 u32 reg; 249 250 dwc3_writel(dwc->regs, DWC3_GDBGFIFOSPACE, 251 DWC3_GDBGFIFOSPACE_NUM(dep->number) | 252 DWC3_GDBGFIFOSPACE_TYPE(type)); 253 254 reg = dwc3_readl(dwc->regs, DWC3_GDBGFIFOSPACE); 255 256 return DWC3_GDBGFIFOSPACE_SPACE_AVAILABLE(reg); 257 } 258 259 /** 260 * dwc3_core_soft_reset - Issues core soft reset and PHY reset 261 * @dwc: pointer to our context structure 262 */ 263 static int dwc3_core_soft_reset(struct dwc3 *dwc) 264 { 265 u32 reg; 266 int retries = 1000; 267 int ret; 268 269 usb_phy_init(dwc->usb2_phy); 270 usb_phy_init(dwc->usb3_phy); 271 ret = phy_init(dwc->usb2_generic_phy); 272 if (ret < 0) 273 return ret; 274 275 ret = phy_init(dwc->usb3_generic_phy); 276 if (ret < 0) { 277 phy_exit(dwc->usb2_generic_phy); 278 return ret; 279 } 280 281 /* 282 * We're resetting only the device side because, if we're in host mode, 283 * XHCI driver will reset the host block. If dwc3 was configured for 284 * host-only mode, then we can return early. 285 */ 286 if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) 287 return 0; 288 289 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 290 reg |= DWC3_DCTL_CSFTRST; 291 dwc3_writel(dwc->regs, DWC3_DCTL, reg); 292 293 /* 294 * For DWC_usb31 controller 1.90a and later, the DCTL.CSFRST bit 295 * is cleared only after all the clocks are synchronized. This can 296 * take a little more than 50ms. Set the polling rate at 20ms 297 * for 10 times instead. 298 */ 299 if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32)) 300 retries = 10; 301 302 do { 303 reg = dwc3_readl(dwc->regs, DWC3_DCTL); 304 if (!(reg & DWC3_DCTL_CSFTRST)) 305 goto done; 306 307 if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32)) 308 msleep(20); 309 else 310 udelay(1); 311 } while (--retries); 312 313 phy_exit(dwc->usb3_generic_phy); 314 phy_exit(dwc->usb2_generic_phy); 315 316 return -ETIMEDOUT; 317 318 done: 319 /* 320 * For DWC_usb31 controller 1.80a and prior, once DCTL.CSFRST bit 321 * is cleared, we must wait at least 50ms before accessing the PHY 322 * domain (synchronization delay). 323 */ 324 if (DWC3_VER_IS_WITHIN(DWC31, ANY, 180A)) 325 msleep(50); 326 327 return 0; 328 } 329 330 /* 331 * dwc3_frame_length_adjustment - Adjusts frame length if required 332 * @dwc3: Pointer to our controller context structure 333 */ 334 static void dwc3_frame_length_adjustment(struct dwc3 *dwc) 335 { 336 u32 reg; 337 u32 dft; 338 339 if (DWC3_VER_IS_PRIOR(DWC3, 250A)) 340 return; 341 342 if (dwc->fladj == 0) 343 return; 344 345 reg = dwc3_readl(dwc->regs, DWC3_GFLADJ); 346 dft = reg & DWC3_GFLADJ_30MHZ_MASK; 347 if (dft != dwc->fladj) { 348 reg &= ~DWC3_GFLADJ_30MHZ_MASK; 349 reg |= DWC3_GFLADJ_30MHZ_SDBND_SEL | dwc->fladj; 350 dwc3_writel(dwc->regs, DWC3_GFLADJ, reg); 351 } 352 } 353 354 /** 355 * dwc3_free_one_event_buffer - Frees one event buffer 356 * @dwc: Pointer to our controller context structure 357 * @evt: Pointer to event buffer to be freed 358 */ 359 static void dwc3_free_one_event_buffer(struct dwc3 *dwc, 360 struct dwc3_event_buffer *evt) 361 { 362 dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma); 363 } 364 365 /** 366 * dwc3_alloc_one_event_buffer - Allocates one event buffer structure 367 * @dwc: Pointer to our controller context structure 368 * @length: size of the event buffer 369 * 370 * Returns a pointer to the allocated event buffer structure on success 371 * otherwise ERR_PTR(errno). 372 */ 373 static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc, 374 unsigned length) 375 { 376 struct dwc3_event_buffer *evt; 377 378 evt = devm_kzalloc(dwc->dev, sizeof(*evt), GFP_KERNEL); 379 if (!evt) 380 return ERR_PTR(-ENOMEM); 381 382 evt->dwc = dwc; 383 evt->length = length; 384 evt->cache = devm_kzalloc(dwc->dev, length, GFP_KERNEL); 385 if (!evt->cache) 386 return ERR_PTR(-ENOMEM); 387 388 evt->buf = dma_alloc_coherent(dwc->sysdev, length, 389 &evt->dma, GFP_KERNEL); 390 if (!evt->buf) 391 return ERR_PTR(-ENOMEM); 392 393 return evt; 394 } 395 396 /** 397 * dwc3_free_event_buffers - frees all allocated event buffers 398 * @dwc: Pointer to our controller context structure 399 */ 400 static void dwc3_free_event_buffers(struct dwc3 *dwc) 401 { 402 struct dwc3_event_buffer *evt; 403 404 evt = dwc->ev_buf; 405 if (evt) 406 dwc3_free_one_event_buffer(dwc, evt); 407 } 408 409 /** 410 * dwc3_alloc_event_buffers - Allocates @num event buffers of size @length 411 * @dwc: pointer to our controller context structure 412 * @length: size of event buffer 413 * 414 * Returns 0 on success otherwise negative errno. In the error case, dwc 415 * may contain some buffers allocated but not all which were requested. 416 */ 417 static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length) 418 { 419 struct dwc3_event_buffer *evt; 420 421 evt = dwc3_alloc_one_event_buffer(dwc, length); 422 if (IS_ERR(evt)) { 423 dev_err(dwc->dev, "can't allocate event buffer\n"); 424 return PTR_ERR(evt); 425 } 426 dwc->ev_buf = evt; 427 428 return 0; 429 } 430 431 /** 432 * dwc3_event_buffers_setup - setup our allocated event buffers 433 * @dwc: pointer to our controller context structure 434 * 435 * Returns 0 on success otherwise negative errno. 436 */ 437 int dwc3_event_buffers_setup(struct dwc3 *dwc) 438 { 439 struct dwc3_event_buffer *evt; 440 441 evt = dwc->ev_buf; 442 evt->lpos = 0; 443 dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), 444 lower_32_bits(evt->dma)); 445 dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0), 446 upper_32_bits(evt->dma)); 447 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), 448 DWC3_GEVNTSIZ_SIZE(evt->length)); 449 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0); 450 451 return 0; 452 } 453 454 void dwc3_event_buffers_cleanup(struct dwc3 *dwc) 455 { 456 struct dwc3_event_buffer *evt; 457 458 evt = dwc->ev_buf; 459 460 evt->lpos = 0; 461 462 dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), 0); 463 dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0), 0); 464 dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), DWC3_GEVNTSIZ_INTMASK 465 | DWC3_GEVNTSIZ_SIZE(0)); 466 dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0); 467 } 468 469 static int dwc3_alloc_scratch_buffers(struct dwc3 *dwc) 470 { 471 if (!dwc->has_hibernation) 472 return 0; 473 474 if (!dwc->nr_scratch) 475 return 0; 476 477 dwc->scratchbuf = kmalloc_array(dwc->nr_scratch, 478 DWC3_SCRATCHBUF_SIZE, GFP_KERNEL); 479 if (!dwc->scratchbuf) 480 return -ENOMEM; 481 482 return 0; 483 } 484 485 static int dwc3_setup_scratch_buffers(struct dwc3 *dwc) 486 { 487 dma_addr_t scratch_addr; 488 u32 param; 489 int ret; 490 491 if (!dwc->has_hibernation) 492 return 0; 493 494 if (!dwc->nr_scratch) 495 return 0; 496 497 /* should never fall here */ 498 if (!WARN_ON(dwc->scratchbuf)) 499 return 0; 500 501 scratch_addr = dma_map_single(dwc->sysdev, dwc->scratchbuf, 502 dwc->nr_scratch * DWC3_SCRATCHBUF_SIZE, 503 DMA_BIDIRECTIONAL); 504 if (dma_mapping_error(dwc->sysdev, scratch_addr)) { 505 dev_err(dwc->sysdev, "failed to map scratch buffer\n"); 506 ret = -EFAULT; 507 goto err0; 508 } 509 510 dwc->scratch_addr = scratch_addr; 511 512 param = lower_32_bits(scratch_addr); 513 514 ret = dwc3_send_gadget_generic_command(dwc, 515 DWC3_DGCMD_SET_SCRATCHPAD_ADDR_LO, param); 516 if (ret < 0) 517 goto err1; 518 519 param = upper_32_bits(scratch_addr); 520 521 ret = dwc3_send_gadget_generic_command(dwc, 522 DWC3_DGCMD_SET_SCRATCHPAD_ADDR_HI, param); 523 if (ret < 0) 524 goto err1; 525 526 return 0; 527 528 err1: 529 dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch * 530 DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL); 531 532 err0: 533 return ret; 534 } 535 536 static void dwc3_free_scratch_buffers(struct dwc3 *dwc) 537 { 538 if (!dwc->has_hibernation) 539 return; 540 541 if (!dwc->nr_scratch) 542 return; 543 544 /* should never fall here */ 545 if (!WARN_ON(dwc->scratchbuf)) 546 return; 547 548 dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch * 549 DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL); 550 kfree(dwc->scratchbuf); 551 } 552 553 static void dwc3_core_num_eps(struct dwc3 *dwc) 554 { 555 struct dwc3_hwparams *parms = &dwc->hwparams; 556 557 dwc->num_eps = DWC3_NUM_EPS(parms); 558 } 559 560 static void dwc3_cache_hwparams(struct dwc3 *dwc) 561 { 562 struct dwc3_hwparams *parms = &dwc->hwparams; 563 564 parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0); 565 parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1); 566 parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2); 567 parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3); 568 parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4); 569 parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5); 570 parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6); 571 parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7); 572 parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8); 573 574 if (DWC3_IP_IS(DWC32)) 575 parms->hwparams9 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS9); 576 } 577 578 static int dwc3_core_ulpi_init(struct dwc3 *dwc) 579 { 580 int intf; 581 int ret = 0; 582 583 intf = DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3); 584 585 if (intf == DWC3_GHWPARAMS3_HSPHY_IFC_ULPI || 586 (intf == DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI && 587 dwc->hsphy_interface && 588 !strncmp(dwc->hsphy_interface, "ulpi", 4))) 589 ret = dwc3_ulpi_init(dwc); 590 591 return ret; 592 } 593 594 /** 595 * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core 596 * @dwc: Pointer to our controller context structure 597 * 598 * Returns 0 on success. The USB PHY interfaces are configured but not 599 * initialized. The PHY interfaces and the PHYs get initialized together with 600 * the core in dwc3_core_init. 601 */ 602 static int dwc3_phy_setup(struct dwc3 *dwc) 603 { 604 unsigned int hw_mode; 605 u32 reg; 606 607 hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); 608 609 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)); 610 611 /* 612 * Make sure UX_EXIT_PX is cleared as that causes issues with some 613 * PHYs. Also, this bit is not supposed to be used in normal operation. 614 */ 615 reg &= ~DWC3_GUSB3PIPECTL_UX_EXIT_PX; 616 617 /* 618 * Above 1.94a, it is recommended to set DWC3_GUSB3PIPECTL_SUSPHY 619 * to '0' during coreConsultant configuration. So default value 620 * will be '0' when the core is reset. Application needs to set it 621 * to '1' after the core initialization is completed. 622 */ 623 if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) 624 reg |= DWC3_GUSB3PIPECTL_SUSPHY; 625 626 /* 627 * For DRD controllers, GUSB3PIPECTL.SUSPENDENABLE must be cleared after 628 * power-on reset, and it can be set after core initialization, which is 629 * after device soft-reset during initialization. 630 */ 631 if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD) 632 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY; 633 634 if (dwc->u2ss_inp3_quirk) 635 reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK; 636 637 if (dwc->dis_rxdet_inp3_quirk) 638 reg |= DWC3_GUSB3PIPECTL_DISRXDETINP3; 639 640 if (dwc->req_p1p2p3_quirk) 641 reg |= DWC3_GUSB3PIPECTL_REQP1P2P3; 642 643 if (dwc->del_p1p2p3_quirk) 644 reg |= DWC3_GUSB3PIPECTL_DEP1P2P3_EN; 645 646 if (dwc->del_phy_power_chg_quirk) 647 reg |= DWC3_GUSB3PIPECTL_DEPOCHANGE; 648 649 if (dwc->lfps_filter_quirk) 650 reg |= DWC3_GUSB3PIPECTL_LFPSFILT; 651 652 if (dwc->rx_detect_poll_quirk) 653 reg |= DWC3_GUSB3PIPECTL_RX_DETOPOLL; 654 655 if (dwc->tx_de_emphasis_quirk) 656 reg |= DWC3_GUSB3PIPECTL_TX_DEEPH(dwc->tx_de_emphasis); 657 658 if (dwc->dis_u3_susphy_quirk) 659 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY; 660 661 if (dwc->dis_del_phy_power_chg_quirk) 662 reg &= ~DWC3_GUSB3PIPECTL_DEPOCHANGE; 663 664 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg); 665 666 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 667 668 /* Select the HS PHY interface */ 669 switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) { 670 case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI: 671 if (dwc->hsphy_interface && 672 !strncmp(dwc->hsphy_interface, "utmi", 4)) { 673 reg &= ~DWC3_GUSB2PHYCFG_ULPI_UTMI; 674 break; 675 } else if (dwc->hsphy_interface && 676 !strncmp(dwc->hsphy_interface, "ulpi", 4)) { 677 reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI; 678 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 679 } else { 680 /* Relying on default value. */ 681 if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI)) 682 break; 683 } 684 fallthrough; 685 case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI: 686 default: 687 break; 688 } 689 690 switch (dwc->hsphy_mode) { 691 case USBPHY_INTERFACE_MODE_UTMI: 692 reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK | 693 DWC3_GUSB2PHYCFG_USBTRDTIM_MASK); 694 reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_8_BIT) | 695 DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_8_BIT); 696 break; 697 case USBPHY_INTERFACE_MODE_UTMIW: 698 reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK | 699 DWC3_GUSB2PHYCFG_USBTRDTIM_MASK); 700 reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_16_BIT) | 701 DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_16_BIT); 702 break; 703 default: 704 break; 705 } 706 707 /* 708 * Above 1.94a, it is recommended to set DWC3_GUSB2PHYCFG_SUSPHY to 709 * '0' during coreConsultant configuration. So default value will 710 * be '0' when the core is reset. Application needs to set it to 711 * '1' after the core initialization is completed. 712 */ 713 if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) 714 reg |= DWC3_GUSB2PHYCFG_SUSPHY; 715 716 /* 717 * For DRD controllers, GUSB2PHYCFG.SUSPHY must be cleared after 718 * power-on reset, and it can be set after core initialization, which is 719 * after device soft-reset during initialization. 720 */ 721 if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD) 722 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; 723 724 if (dwc->dis_u2_susphy_quirk) 725 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; 726 727 if (dwc->dis_enblslpm_quirk) 728 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM; 729 else 730 reg |= DWC3_GUSB2PHYCFG_ENBLSLPM; 731 732 if (dwc->dis_u2_freeclk_exists_quirk) 733 reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS; 734 735 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 736 737 return 0; 738 } 739 740 static void dwc3_core_exit(struct dwc3 *dwc) 741 { 742 dwc3_event_buffers_cleanup(dwc); 743 744 usb_phy_shutdown(dwc->usb2_phy); 745 usb_phy_shutdown(dwc->usb3_phy); 746 phy_exit(dwc->usb2_generic_phy); 747 phy_exit(dwc->usb3_generic_phy); 748 749 usb_phy_set_suspend(dwc->usb2_phy, 1); 750 usb_phy_set_suspend(dwc->usb3_phy, 1); 751 phy_power_off(dwc->usb2_generic_phy); 752 phy_power_off(dwc->usb3_generic_phy); 753 clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks); 754 reset_control_assert(dwc->reset); 755 } 756 757 static bool dwc3_core_is_valid(struct dwc3 *dwc) 758 { 759 u32 reg; 760 761 reg = dwc3_readl(dwc->regs, DWC3_GSNPSID); 762 dwc->ip = DWC3_GSNPS_ID(reg); 763 764 /* This should read as U3 followed by revision number */ 765 if (DWC3_IP_IS(DWC3)) { 766 dwc->revision = reg; 767 } else if (DWC3_IP_IS(DWC31) || DWC3_IP_IS(DWC32)) { 768 dwc->revision = dwc3_readl(dwc->regs, DWC3_VER_NUMBER); 769 dwc->version_type = dwc3_readl(dwc->regs, DWC3_VER_TYPE); 770 } else { 771 return false; 772 } 773 774 return true; 775 } 776 777 static void dwc3_core_setup_global_control(struct dwc3 *dwc) 778 { 779 u32 hwparams4 = dwc->hwparams.hwparams4; 780 u32 reg; 781 782 reg = dwc3_readl(dwc->regs, DWC3_GCTL); 783 reg &= ~DWC3_GCTL_SCALEDOWN_MASK; 784 785 switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) { 786 case DWC3_GHWPARAMS1_EN_PWROPT_CLK: 787 /** 788 * WORKAROUND: DWC3 revisions between 2.10a and 2.50a have an 789 * issue which would cause xHCI compliance tests to fail. 790 * 791 * Because of that we cannot enable clock gating on such 792 * configurations. 793 * 794 * Refers to: 795 * 796 * STAR#9000588375: Clock Gating, SOF Issues when ref_clk-Based 797 * SOF/ITP Mode Used 798 */ 799 if ((dwc->dr_mode == USB_DR_MODE_HOST || 800 dwc->dr_mode == USB_DR_MODE_OTG) && 801 DWC3_VER_IS_WITHIN(DWC3, 210A, 250A)) 802 reg |= DWC3_GCTL_DSBLCLKGTNG | DWC3_GCTL_SOFITPSYNC; 803 else 804 reg &= ~DWC3_GCTL_DSBLCLKGTNG; 805 break; 806 case DWC3_GHWPARAMS1_EN_PWROPT_HIB: 807 /* enable hibernation here */ 808 dwc->nr_scratch = DWC3_GHWPARAMS4_HIBER_SCRATCHBUFS(hwparams4); 809 810 /* 811 * REVISIT Enabling this bit so that host-mode hibernation 812 * will work. Device-mode hibernation is not yet implemented. 813 */ 814 reg |= DWC3_GCTL_GBLHIBERNATIONEN; 815 break; 816 default: 817 /* nothing */ 818 break; 819 } 820 821 /* check if current dwc3 is on simulation board */ 822 if (dwc->hwparams.hwparams6 & DWC3_GHWPARAMS6_EN_FPGA) { 823 dev_info(dwc->dev, "Running with FPGA optimizations\n"); 824 dwc->is_fpga = true; 825 } 826 827 WARN_ONCE(dwc->disable_scramble_quirk && !dwc->is_fpga, 828 "disable_scramble cannot be used on non-FPGA builds\n"); 829 830 if (dwc->disable_scramble_quirk && dwc->is_fpga) 831 reg |= DWC3_GCTL_DISSCRAMBLE; 832 else 833 reg &= ~DWC3_GCTL_DISSCRAMBLE; 834 835 if (dwc->u2exit_lfps_quirk) 836 reg |= DWC3_GCTL_U2EXIT_LFPS; 837 838 /* 839 * WORKAROUND: DWC3 revisions <1.90a have a bug 840 * where the device can fail to connect at SuperSpeed 841 * and falls back to high-speed mode which causes 842 * the device to enter a Connect/Disconnect loop 843 */ 844 if (DWC3_VER_IS_PRIOR(DWC3, 190A)) 845 reg |= DWC3_GCTL_U2RSTECN; 846 847 dwc3_writel(dwc->regs, DWC3_GCTL, reg); 848 } 849 850 static int dwc3_core_get_phy(struct dwc3 *dwc); 851 static int dwc3_core_ulpi_init(struct dwc3 *dwc); 852 853 /* set global incr burst type configuration registers */ 854 static void dwc3_set_incr_burst_type(struct dwc3 *dwc) 855 { 856 struct device *dev = dwc->dev; 857 /* incrx_mode : for INCR burst type. */ 858 bool incrx_mode; 859 /* incrx_size : for size of INCRX burst. */ 860 u32 incrx_size; 861 u32 *vals; 862 u32 cfg; 863 int ntype; 864 int ret; 865 int i; 866 867 cfg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0); 868 869 /* 870 * Handle property "snps,incr-burst-type-adjustment". 871 * Get the number of value from this property: 872 * result <= 0, means this property is not supported. 873 * result = 1, means INCRx burst mode supported. 874 * result > 1, means undefined length burst mode supported. 875 */ 876 ntype = device_property_count_u32(dev, "snps,incr-burst-type-adjustment"); 877 if (ntype <= 0) 878 return; 879 880 vals = kcalloc(ntype, sizeof(u32), GFP_KERNEL); 881 if (!vals) { 882 dev_err(dev, "Error to get memory\n"); 883 return; 884 } 885 886 /* Get INCR burst type, and parse it */ 887 ret = device_property_read_u32_array(dev, 888 "snps,incr-burst-type-adjustment", vals, ntype); 889 if (ret) { 890 kfree(vals); 891 dev_err(dev, "Error to get property\n"); 892 return; 893 } 894 895 incrx_size = *vals; 896 897 if (ntype > 1) { 898 /* INCRX (undefined length) burst mode */ 899 incrx_mode = INCRX_UNDEF_LENGTH_BURST_MODE; 900 for (i = 1; i < ntype; i++) { 901 if (vals[i] > incrx_size) 902 incrx_size = vals[i]; 903 } 904 } else { 905 /* INCRX burst mode */ 906 incrx_mode = INCRX_BURST_MODE; 907 } 908 909 kfree(vals); 910 911 /* Enable Undefined Length INCR Burst and Enable INCRx Burst */ 912 cfg &= ~DWC3_GSBUSCFG0_INCRBRST_MASK; 913 if (incrx_mode) 914 cfg |= DWC3_GSBUSCFG0_INCRBRSTENA; 915 switch (incrx_size) { 916 case 256: 917 cfg |= DWC3_GSBUSCFG0_INCR256BRSTENA; 918 break; 919 case 128: 920 cfg |= DWC3_GSBUSCFG0_INCR128BRSTENA; 921 break; 922 case 64: 923 cfg |= DWC3_GSBUSCFG0_INCR64BRSTENA; 924 break; 925 case 32: 926 cfg |= DWC3_GSBUSCFG0_INCR32BRSTENA; 927 break; 928 case 16: 929 cfg |= DWC3_GSBUSCFG0_INCR16BRSTENA; 930 break; 931 case 8: 932 cfg |= DWC3_GSBUSCFG0_INCR8BRSTENA; 933 break; 934 case 4: 935 cfg |= DWC3_GSBUSCFG0_INCR4BRSTENA; 936 break; 937 case 1: 938 break; 939 default: 940 dev_err(dev, "Invalid property\n"); 941 break; 942 } 943 944 dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, cfg); 945 } 946 947 /** 948 * dwc3_core_init - Low-level initialization of DWC3 Core 949 * @dwc: Pointer to our controller context structure 950 * 951 * Returns 0 on success otherwise negative errno. 952 */ 953 static int dwc3_core_init(struct dwc3 *dwc) 954 { 955 unsigned int hw_mode; 956 u32 reg; 957 int ret; 958 959 hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); 960 961 /* 962 * Write Linux Version Code to our GUID register so it's easy to figure 963 * out which kernel version a bug was found. 964 */ 965 dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE); 966 967 ret = dwc3_phy_setup(dwc); 968 if (ret) 969 goto err0; 970 971 if (!dwc->ulpi_ready) { 972 ret = dwc3_core_ulpi_init(dwc); 973 if (ret) 974 goto err0; 975 dwc->ulpi_ready = true; 976 } 977 978 if (!dwc->phys_ready) { 979 ret = dwc3_core_get_phy(dwc); 980 if (ret) 981 goto err0a; 982 dwc->phys_ready = true; 983 } 984 985 ret = dwc3_core_soft_reset(dwc); 986 if (ret) 987 goto err0a; 988 989 if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD && 990 !DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) { 991 if (!dwc->dis_u3_susphy_quirk) { 992 reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)); 993 reg |= DWC3_GUSB3PIPECTL_SUSPHY; 994 dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg); 995 } 996 997 if (!dwc->dis_u2_susphy_quirk) { 998 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 999 reg |= DWC3_GUSB2PHYCFG_SUSPHY; 1000 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 1001 } 1002 } 1003 1004 dwc3_core_setup_global_control(dwc); 1005 dwc3_core_num_eps(dwc); 1006 1007 ret = dwc3_setup_scratch_buffers(dwc); 1008 if (ret) 1009 goto err1; 1010 1011 /* Adjust Frame Length */ 1012 dwc3_frame_length_adjustment(dwc); 1013 1014 dwc3_set_incr_burst_type(dwc); 1015 1016 usb_phy_set_suspend(dwc->usb2_phy, 0); 1017 usb_phy_set_suspend(dwc->usb3_phy, 0); 1018 ret = phy_power_on(dwc->usb2_generic_phy); 1019 if (ret < 0) 1020 goto err2; 1021 1022 ret = phy_power_on(dwc->usb3_generic_phy); 1023 if (ret < 0) 1024 goto err3; 1025 1026 ret = dwc3_event_buffers_setup(dwc); 1027 if (ret) { 1028 dev_err(dwc->dev, "failed to setup event buffers\n"); 1029 goto err4; 1030 } 1031 1032 /* 1033 * ENDXFER polling is available on version 3.10a and later of 1034 * the DWC_usb3 controller. It is NOT available in the 1035 * DWC_usb31 controller. 1036 */ 1037 if (DWC3_VER_IS_WITHIN(DWC3, 310A, ANY)) { 1038 reg = dwc3_readl(dwc->regs, DWC3_GUCTL2); 1039 reg |= DWC3_GUCTL2_RST_ACTBITLATER; 1040 dwc3_writel(dwc->regs, DWC3_GUCTL2, reg); 1041 } 1042 1043 if (!DWC3_VER_IS_PRIOR(DWC3, 250A)) { 1044 reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); 1045 1046 /* 1047 * Enable hardware control of sending remote wakeup 1048 * in HS when the device is in the L1 state. 1049 */ 1050 if (!DWC3_VER_IS_PRIOR(DWC3, 290A)) 1051 reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW; 1052 1053 /* 1054 * Decouple USB 2.0 L1 & L2 events which will allow for 1055 * gadget driver to only receive U3/L2 suspend & wakeup 1056 * events and prevent the more frequent L1 LPM transitions 1057 * from interrupting the driver. 1058 */ 1059 if (!DWC3_VER_IS_PRIOR(DWC3, 300A)) 1060 reg |= DWC3_GUCTL1_DEV_DECOUPLE_L1L2_EVT; 1061 1062 if (dwc->dis_tx_ipgap_linecheck_quirk) 1063 reg |= DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS; 1064 1065 if (dwc->parkmode_disable_ss_quirk) 1066 reg |= DWC3_GUCTL1_PARKMODE_DISABLE_SS; 1067 1068 dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); 1069 } 1070 1071 if (dwc->dr_mode == USB_DR_MODE_HOST || 1072 dwc->dr_mode == USB_DR_MODE_OTG) { 1073 reg = dwc3_readl(dwc->regs, DWC3_GUCTL); 1074 1075 /* 1076 * Enable Auto retry Feature to make the controller operating in 1077 * Host mode on seeing transaction errors(CRC errors or internal 1078 * overrun scenerios) on IN transfers to reply to the device 1079 * with a non-terminating retry ACK (i.e, an ACK transcation 1080 * packet with Retry=1 & Nump != 0) 1081 */ 1082 reg |= DWC3_GUCTL_HSTINAUTORETRY; 1083 1084 dwc3_writel(dwc->regs, DWC3_GUCTL, reg); 1085 } 1086 1087 /* 1088 * Must config both number of packets and max burst settings to enable 1089 * RX and/or TX threshold. 1090 */ 1091 if (!DWC3_IP_IS(DWC3) && dwc->dr_mode == USB_DR_MODE_HOST) { 1092 u8 rx_thr_num = dwc->rx_thr_num_pkt_prd; 1093 u8 rx_maxburst = dwc->rx_max_burst_prd; 1094 u8 tx_thr_num = dwc->tx_thr_num_pkt_prd; 1095 u8 tx_maxburst = dwc->tx_max_burst_prd; 1096 1097 if (rx_thr_num && rx_maxburst) { 1098 reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG); 1099 reg |= DWC31_RXTHRNUMPKTSEL_PRD; 1100 1101 reg &= ~DWC31_RXTHRNUMPKT_PRD(~0); 1102 reg |= DWC31_RXTHRNUMPKT_PRD(rx_thr_num); 1103 1104 reg &= ~DWC31_MAXRXBURSTSIZE_PRD(~0); 1105 reg |= DWC31_MAXRXBURSTSIZE_PRD(rx_maxburst); 1106 1107 dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg); 1108 } 1109 1110 if (tx_thr_num && tx_maxburst) { 1111 reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG); 1112 reg |= DWC31_TXTHRNUMPKTSEL_PRD; 1113 1114 reg &= ~DWC31_TXTHRNUMPKT_PRD(~0); 1115 reg |= DWC31_TXTHRNUMPKT_PRD(tx_thr_num); 1116 1117 reg &= ~DWC31_MAXTXBURSTSIZE_PRD(~0); 1118 reg |= DWC31_MAXTXBURSTSIZE_PRD(tx_maxburst); 1119 1120 dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg); 1121 } 1122 } 1123 1124 return 0; 1125 1126 err4: 1127 phy_power_off(dwc->usb3_generic_phy); 1128 1129 err3: 1130 phy_power_off(dwc->usb2_generic_phy); 1131 1132 err2: 1133 usb_phy_set_suspend(dwc->usb2_phy, 1); 1134 usb_phy_set_suspend(dwc->usb3_phy, 1); 1135 1136 err1: 1137 usb_phy_shutdown(dwc->usb2_phy); 1138 usb_phy_shutdown(dwc->usb3_phy); 1139 phy_exit(dwc->usb2_generic_phy); 1140 phy_exit(dwc->usb3_generic_phy); 1141 1142 err0a: 1143 dwc3_ulpi_exit(dwc); 1144 1145 err0: 1146 return ret; 1147 } 1148 1149 static int dwc3_core_get_phy(struct dwc3 *dwc) 1150 { 1151 struct device *dev = dwc->dev; 1152 struct device_node *node = dev->of_node; 1153 int ret; 1154 1155 if (node) { 1156 dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0); 1157 dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1); 1158 } else { 1159 dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 1160 dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3); 1161 } 1162 1163 if (IS_ERR(dwc->usb2_phy)) { 1164 ret = PTR_ERR(dwc->usb2_phy); 1165 if (ret == -ENXIO || ret == -ENODEV) { 1166 dwc->usb2_phy = NULL; 1167 } else { 1168 return dev_err_probe(dev, ret, "no usb2 phy configured\n"); 1169 } 1170 } 1171 1172 if (IS_ERR(dwc->usb3_phy)) { 1173 ret = PTR_ERR(dwc->usb3_phy); 1174 if (ret == -ENXIO || ret == -ENODEV) { 1175 dwc->usb3_phy = NULL; 1176 } else { 1177 return dev_err_probe(dev, ret, "no usb3 phy configured\n"); 1178 } 1179 } 1180 1181 dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy"); 1182 if (IS_ERR(dwc->usb2_generic_phy)) { 1183 ret = PTR_ERR(dwc->usb2_generic_phy); 1184 if (ret == -ENOSYS || ret == -ENODEV) { 1185 dwc->usb2_generic_phy = NULL; 1186 } else { 1187 return dev_err_probe(dev, ret, "no usb2 phy configured\n"); 1188 } 1189 } 1190 1191 dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy"); 1192 if (IS_ERR(dwc->usb3_generic_phy)) { 1193 ret = PTR_ERR(dwc->usb3_generic_phy); 1194 if (ret == -ENOSYS || ret == -ENODEV) { 1195 dwc->usb3_generic_phy = NULL; 1196 } else { 1197 return dev_err_probe(dev, ret, "no usb3 phy configured\n"); 1198 } 1199 } 1200 1201 return 0; 1202 } 1203 1204 static int dwc3_core_init_mode(struct dwc3 *dwc) 1205 { 1206 struct device *dev = dwc->dev; 1207 int ret; 1208 1209 switch (dwc->dr_mode) { 1210 case USB_DR_MODE_PERIPHERAL: 1211 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE); 1212 1213 if (dwc->usb2_phy) 1214 otg_set_vbus(dwc->usb2_phy->otg, false); 1215 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE); 1216 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE); 1217 1218 ret = dwc3_gadget_init(dwc); 1219 if (ret) 1220 return dev_err_probe(dev, ret, "failed to initialize gadget\n"); 1221 break; 1222 case USB_DR_MODE_HOST: 1223 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); 1224 1225 if (dwc->usb2_phy) 1226 otg_set_vbus(dwc->usb2_phy->otg, true); 1227 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST); 1228 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST); 1229 1230 ret = dwc3_host_init(dwc); 1231 if (ret) 1232 return dev_err_probe(dev, ret, "failed to initialize host\n"); 1233 break; 1234 case USB_DR_MODE_OTG: 1235 INIT_WORK(&dwc->drd_work, __dwc3_set_mode); 1236 ret = dwc3_drd_init(dwc); 1237 if (ret) 1238 return dev_err_probe(dev, ret, "failed to initialize dual-role\n"); 1239 break; 1240 default: 1241 dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode); 1242 return -EINVAL; 1243 } 1244 1245 return 0; 1246 } 1247 1248 static void dwc3_core_exit_mode(struct dwc3 *dwc) 1249 { 1250 switch (dwc->dr_mode) { 1251 case USB_DR_MODE_PERIPHERAL: 1252 dwc3_gadget_exit(dwc); 1253 break; 1254 case USB_DR_MODE_HOST: 1255 dwc3_host_exit(dwc); 1256 break; 1257 case USB_DR_MODE_OTG: 1258 dwc3_drd_exit(dwc); 1259 break; 1260 default: 1261 /* do nothing */ 1262 break; 1263 } 1264 1265 /* de-assert DRVVBUS for HOST and OTG mode */ 1266 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE); 1267 } 1268 1269 static void dwc3_get_properties(struct dwc3 *dwc) 1270 { 1271 struct device *dev = dwc->dev; 1272 u8 lpm_nyet_threshold; 1273 u8 tx_de_emphasis; 1274 u8 hird_threshold; 1275 u8 rx_thr_num_pkt_prd; 1276 u8 rx_max_burst_prd; 1277 u8 tx_thr_num_pkt_prd; 1278 u8 tx_max_burst_prd; 1279 u8 tx_fifo_resize_max_num; 1280 const char *usb_psy_name; 1281 int ret; 1282 1283 /* default to highest possible threshold */ 1284 lpm_nyet_threshold = 0xf; 1285 1286 /* default to -3.5dB de-emphasis */ 1287 tx_de_emphasis = 1; 1288 1289 /* 1290 * default to assert utmi_sleep_n and use maximum allowed HIRD 1291 * threshold value of 0b1100 1292 */ 1293 hird_threshold = 12; 1294 1295 /* 1296 * default to a TXFIFO size large enough to fit 6 max packets. This 1297 * allows for systems with larger bus latencies to have some headroom 1298 * for endpoints that have a large bMaxBurst value. 1299 */ 1300 tx_fifo_resize_max_num = 6; 1301 1302 dwc->maximum_speed = usb_get_maximum_speed(dev); 1303 dwc->max_ssp_rate = usb_get_maximum_ssp_rate(dev); 1304 dwc->dr_mode = usb_get_dr_mode(dev); 1305 dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node); 1306 1307 dwc->sysdev_is_parent = device_property_read_bool(dev, 1308 "linux,sysdev_is_parent"); 1309 if (dwc->sysdev_is_parent) 1310 dwc->sysdev = dwc->dev->parent; 1311 else 1312 dwc->sysdev = dwc->dev; 1313 1314 ret = device_property_read_string(dev, "usb-psy-name", &usb_psy_name); 1315 if (ret >= 0) { 1316 dwc->usb_psy = power_supply_get_by_name(usb_psy_name); 1317 if (!dwc->usb_psy) 1318 dev_err(dev, "couldn't get usb power supply\n"); 1319 } 1320 1321 dwc->has_lpm_erratum = device_property_read_bool(dev, 1322 "snps,has-lpm-erratum"); 1323 device_property_read_u8(dev, "snps,lpm-nyet-threshold", 1324 &lpm_nyet_threshold); 1325 dwc->is_utmi_l1_suspend = device_property_read_bool(dev, 1326 "snps,is-utmi-l1-suspend"); 1327 device_property_read_u8(dev, "snps,hird-threshold", 1328 &hird_threshold); 1329 dwc->dis_start_transfer_quirk = device_property_read_bool(dev, 1330 "snps,dis-start-transfer-quirk"); 1331 dwc->usb3_lpm_capable = device_property_read_bool(dev, 1332 "snps,usb3_lpm_capable"); 1333 dwc->usb2_lpm_disable = device_property_read_bool(dev, 1334 "snps,usb2-lpm-disable"); 1335 dwc->usb2_gadget_lpm_disable = device_property_read_bool(dev, 1336 "snps,usb2-gadget-lpm-disable"); 1337 device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd", 1338 &rx_thr_num_pkt_prd); 1339 device_property_read_u8(dev, "snps,rx-max-burst-prd", 1340 &rx_max_burst_prd); 1341 device_property_read_u8(dev, "snps,tx-thr-num-pkt-prd", 1342 &tx_thr_num_pkt_prd); 1343 device_property_read_u8(dev, "snps,tx-max-burst-prd", 1344 &tx_max_burst_prd); 1345 dwc->do_fifo_resize = device_property_read_bool(dev, 1346 "tx-fifo-resize"); 1347 if (dwc->do_fifo_resize) 1348 device_property_read_u8(dev, "tx-fifo-max-num", 1349 &tx_fifo_resize_max_num); 1350 1351 dwc->disable_scramble_quirk = device_property_read_bool(dev, 1352 "snps,disable_scramble_quirk"); 1353 dwc->u2exit_lfps_quirk = device_property_read_bool(dev, 1354 "snps,u2exit_lfps_quirk"); 1355 dwc->u2ss_inp3_quirk = device_property_read_bool(dev, 1356 "snps,u2ss_inp3_quirk"); 1357 dwc->req_p1p2p3_quirk = device_property_read_bool(dev, 1358 "snps,req_p1p2p3_quirk"); 1359 dwc->del_p1p2p3_quirk = device_property_read_bool(dev, 1360 "snps,del_p1p2p3_quirk"); 1361 dwc->del_phy_power_chg_quirk = device_property_read_bool(dev, 1362 "snps,del_phy_power_chg_quirk"); 1363 dwc->lfps_filter_quirk = device_property_read_bool(dev, 1364 "snps,lfps_filter_quirk"); 1365 dwc->rx_detect_poll_quirk = device_property_read_bool(dev, 1366 "snps,rx_detect_poll_quirk"); 1367 dwc->dis_u3_susphy_quirk = device_property_read_bool(dev, 1368 "snps,dis_u3_susphy_quirk"); 1369 dwc->dis_u2_susphy_quirk = device_property_read_bool(dev, 1370 "snps,dis_u2_susphy_quirk"); 1371 dwc->dis_enblslpm_quirk = device_property_read_bool(dev, 1372 "snps,dis_enblslpm_quirk"); 1373 dwc->dis_u1_entry_quirk = device_property_read_bool(dev, 1374 "snps,dis-u1-entry-quirk"); 1375 dwc->dis_u2_entry_quirk = device_property_read_bool(dev, 1376 "snps,dis-u2-entry-quirk"); 1377 dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev, 1378 "snps,dis_rxdet_inp3_quirk"); 1379 dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev, 1380 "snps,dis-u2-freeclk-exists-quirk"); 1381 dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev, 1382 "snps,dis-del-phy-power-chg-quirk"); 1383 dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev, 1384 "snps,dis-tx-ipgap-linecheck-quirk"); 1385 dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev, 1386 "snps,parkmode-disable-ss-quirk"); 1387 1388 dwc->tx_de_emphasis_quirk = device_property_read_bool(dev, 1389 "snps,tx_de_emphasis_quirk"); 1390 device_property_read_u8(dev, "snps,tx_de_emphasis", 1391 &tx_de_emphasis); 1392 device_property_read_string(dev, "snps,hsphy_interface", 1393 &dwc->hsphy_interface); 1394 device_property_read_u32(dev, "snps,quirk-frame-length-adjustment", 1395 &dwc->fladj); 1396 1397 dwc->dis_metastability_quirk = device_property_read_bool(dev, 1398 "snps,dis_metastability_quirk"); 1399 1400 dwc->dis_split_quirk = device_property_read_bool(dev, 1401 "snps,dis-split-quirk"); 1402 1403 dwc->lpm_nyet_threshold = lpm_nyet_threshold; 1404 dwc->tx_de_emphasis = tx_de_emphasis; 1405 1406 dwc->hird_threshold = hird_threshold; 1407 1408 dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd; 1409 dwc->rx_max_burst_prd = rx_max_burst_prd; 1410 1411 dwc->tx_thr_num_pkt_prd = tx_thr_num_pkt_prd; 1412 dwc->tx_max_burst_prd = tx_max_burst_prd; 1413 1414 dwc->imod_interval = 0; 1415 1416 dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num; 1417 } 1418 1419 /* check whether the core supports IMOD */ 1420 bool dwc3_has_imod(struct dwc3 *dwc) 1421 { 1422 return DWC3_VER_IS_WITHIN(DWC3, 300A, ANY) || 1423 DWC3_VER_IS_WITHIN(DWC31, 120A, ANY) || 1424 DWC3_IP_IS(DWC32); 1425 } 1426 1427 static void dwc3_check_params(struct dwc3 *dwc) 1428 { 1429 struct device *dev = dwc->dev; 1430 unsigned int hwparam_gen = 1431 DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3); 1432 1433 /* Check for proper value of imod_interval */ 1434 if (dwc->imod_interval && !dwc3_has_imod(dwc)) { 1435 dev_warn(dwc->dev, "Interrupt moderation not supported\n"); 1436 dwc->imod_interval = 0; 1437 } 1438 1439 /* 1440 * Workaround for STAR 9000961433 which affects only version 1441 * 3.00a of the DWC_usb3 core. This prevents the controller 1442 * interrupt from being masked while handling events. IMOD 1443 * allows us to work around this issue. Enable it for the 1444 * affected version. 1445 */ 1446 if (!dwc->imod_interval && 1447 DWC3_VER_IS(DWC3, 300A)) 1448 dwc->imod_interval = 1; 1449 1450 /* Check the maximum_speed parameter */ 1451 switch (dwc->maximum_speed) { 1452 case USB_SPEED_FULL: 1453 case USB_SPEED_HIGH: 1454 break; 1455 case USB_SPEED_SUPER: 1456 if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS) 1457 dev_warn(dev, "UDC doesn't support Gen 1\n"); 1458 break; 1459 case USB_SPEED_SUPER_PLUS: 1460 if ((DWC3_IP_IS(DWC32) && 1461 hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS) || 1462 (!DWC3_IP_IS(DWC32) && 1463 hwparam_gen != DWC3_GHWPARAMS3_SSPHY_IFC_GEN2)) 1464 dev_warn(dev, "UDC doesn't support SSP\n"); 1465 break; 1466 default: 1467 dev_err(dev, "invalid maximum_speed parameter %d\n", 1468 dwc->maximum_speed); 1469 fallthrough; 1470 case USB_SPEED_UNKNOWN: 1471 switch (hwparam_gen) { 1472 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2: 1473 dwc->maximum_speed = USB_SPEED_SUPER_PLUS; 1474 break; 1475 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1: 1476 if (DWC3_IP_IS(DWC32)) 1477 dwc->maximum_speed = USB_SPEED_SUPER_PLUS; 1478 else 1479 dwc->maximum_speed = USB_SPEED_SUPER; 1480 break; 1481 case DWC3_GHWPARAMS3_SSPHY_IFC_DIS: 1482 dwc->maximum_speed = USB_SPEED_HIGH; 1483 break; 1484 default: 1485 dwc->maximum_speed = USB_SPEED_SUPER; 1486 break; 1487 } 1488 break; 1489 } 1490 1491 /* 1492 * Currently the controller does not have visibility into the HW 1493 * parameter to determine the maximum number of lanes the HW supports. 1494 * If the number of lanes is not specified in the device property, then 1495 * set the default to support dual-lane for DWC_usb32 and single-lane 1496 * for DWC_usb31 for super-speed-plus. 1497 */ 1498 if (dwc->maximum_speed == USB_SPEED_SUPER_PLUS) { 1499 switch (dwc->max_ssp_rate) { 1500 case USB_SSP_GEN_2x1: 1501 if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_GEN1) 1502 dev_warn(dev, "UDC only supports Gen 1\n"); 1503 break; 1504 case USB_SSP_GEN_1x2: 1505 case USB_SSP_GEN_2x2: 1506 if (DWC3_IP_IS(DWC31)) 1507 dev_warn(dev, "UDC only supports single lane\n"); 1508 break; 1509 case USB_SSP_GEN_UNKNOWN: 1510 default: 1511 switch (hwparam_gen) { 1512 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2: 1513 if (DWC3_IP_IS(DWC32)) 1514 dwc->max_ssp_rate = USB_SSP_GEN_2x2; 1515 else 1516 dwc->max_ssp_rate = USB_SSP_GEN_2x1; 1517 break; 1518 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1: 1519 if (DWC3_IP_IS(DWC32)) 1520 dwc->max_ssp_rate = USB_SSP_GEN_1x2; 1521 break; 1522 } 1523 break; 1524 } 1525 } 1526 } 1527 1528 static int dwc3_probe(struct platform_device *pdev) 1529 { 1530 struct device *dev = &pdev->dev; 1531 struct resource *res, dwc_res; 1532 struct dwc3 *dwc; 1533 1534 int ret; 1535 1536 void __iomem *regs; 1537 1538 dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL); 1539 if (!dwc) 1540 return -ENOMEM; 1541 1542 dwc->dev = dev; 1543 1544 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1545 if (!res) { 1546 dev_err(dev, "missing memory resource\n"); 1547 return -ENODEV; 1548 } 1549 1550 dwc->xhci_resources[0].start = res->start; 1551 dwc->xhci_resources[0].end = dwc->xhci_resources[0].start + 1552 DWC3_XHCI_REGS_END; 1553 dwc->xhci_resources[0].flags = res->flags; 1554 dwc->xhci_resources[0].name = res->name; 1555 1556 /* 1557 * Request memory region but exclude xHCI regs, 1558 * since it will be requested by the xhci-plat driver. 1559 */ 1560 dwc_res = *res; 1561 dwc_res.start += DWC3_GLOBALS_REGS_START; 1562 1563 regs = devm_ioremap_resource(dev, &dwc_res); 1564 if (IS_ERR(regs)) 1565 return PTR_ERR(regs); 1566 1567 dwc->regs = regs; 1568 dwc->regs_size = resource_size(&dwc_res); 1569 1570 dwc3_get_properties(dwc); 1571 1572 ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64)); 1573 if (ret) 1574 return ret; 1575 1576 dwc->reset = devm_reset_control_array_get_optional_shared(dev); 1577 if (IS_ERR(dwc->reset)) 1578 return PTR_ERR(dwc->reset); 1579 1580 if (dev->of_node) { 1581 ret = devm_clk_bulk_get_all(dev, &dwc->clks); 1582 if (ret == -EPROBE_DEFER) 1583 return ret; 1584 /* 1585 * Clocks are optional, but new DT platforms should support all 1586 * clocks as required by the DT-binding. 1587 */ 1588 if (ret < 0) 1589 dwc->num_clks = 0; 1590 else 1591 dwc->num_clks = ret; 1592 1593 } 1594 1595 ret = reset_control_deassert(dwc->reset); 1596 if (ret) 1597 return ret; 1598 1599 ret = clk_bulk_prepare_enable(dwc->num_clks, dwc->clks); 1600 if (ret) 1601 goto assert_reset; 1602 1603 if (!dwc3_core_is_valid(dwc)) { 1604 dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n"); 1605 ret = -ENODEV; 1606 goto disable_clks; 1607 } 1608 1609 platform_set_drvdata(pdev, dwc); 1610 dwc3_cache_hwparams(dwc); 1611 1612 spin_lock_init(&dwc->lock); 1613 mutex_init(&dwc->mutex); 1614 1615 pm_runtime_set_active(dev); 1616 pm_runtime_use_autosuspend(dev); 1617 pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY); 1618 pm_runtime_enable(dev); 1619 ret = pm_runtime_get_sync(dev); 1620 if (ret < 0) 1621 goto err1; 1622 1623 pm_runtime_forbid(dev); 1624 1625 ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE); 1626 if (ret) { 1627 dev_err(dwc->dev, "failed to allocate event buffers\n"); 1628 ret = -ENOMEM; 1629 goto err2; 1630 } 1631 1632 ret = dwc3_get_dr_mode(dwc); 1633 if (ret) 1634 goto err3; 1635 1636 ret = dwc3_alloc_scratch_buffers(dwc); 1637 if (ret) 1638 goto err3; 1639 1640 ret = dwc3_core_init(dwc); 1641 if (ret) { 1642 dev_err_probe(dev, ret, "failed to initialize core\n"); 1643 goto err4; 1644 } 1645 1646 dwc3_check_params(dwc); 1647 dwc3_debugfs_init(dwc); 1648 1649 ret = dwc3_core_init_mode(dwc); 1650 if (ret) 1651 goto err5; 1652 1653 pm_runtime_put(dev); 1654 1655 return 0; 1656 1657 err5: 1658 dwc3_debugfs_exit(dwc); 1659 dwc3_event_buffers_cleanup(dwc); 1660 1661 usb_phy_shutdown(dwc->usb2_phy); 1662 usb_phy_shutdown(dwc->usb3_phy); 1663 phy_exit(dwc->usb2_generic_phy); 1664 phy_exit(dwc->usb3_generic_phy); 1665 1666 usb_phy_set_suspend(dwc->usb2_phy, 1); 1667 usb_phy_set_suspend(dwc->usb3_phy, 1); 1668 phy_power_off(dwc->usb2_generic_phy); 1669 phy_power_off(dwc->usb3_generic_phy); 1670 1671 dwc3_ulpi_exit(dwc); 1672 1673 err4: 1674 dwc3_free_scratch_buffers(dwc); 1675 1676 err3: 1677 dwc3_free_event_buffers(dwc); 1678 1679 err2: 1680 pm_runtime_allow(&pdev->dev); 1681 1682 err1: 1683 pm_runtime_put_sync(&pdev->dev); 1684 pm_runtime_disable(&pdev->dev); 1685 1686 disable_clks: 1687 clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks); 1688 assert_reset: 1689 reset_control_assert(dwc->reset); 1690 1691 if (dwc->usb_psy) 1692 power_supply_put(dwc->usb_psy); 1693 1694 return ret; 1695 } 1696 1697 static int dwc3_remove(struct platform_device *pdev) 1698 { 1699 struct dwc3 *dwc = platform_get_drvdata(pdev); 1700 1701 pm_runtime_get_sync(&pdev->dev); 1702 1703 dwc3_core_exit_mode(dwc); 1704 dwc3_debugfs_exit(dwc); 1705 1706 dwc3_core_exit(dwc); 1707 dwc3_ulpi_exit(dwc); 1708 1709 pm_runtime_disable(&pdev->dev); 1710 pm_runtime_put_noidle(&pdev->dev); 1711 pm_runtime_set_suspended(&pdev->dev); 1712 1713 dwc3_free_event_buffers(dwc); 1714 dwc3_free_scratch_buffers(dwc); 1715 1716 if (dwc->usb_psy) 1717 power_supply_put(dwc->usb_psy); 1718 1719 return 0; 1720 } 1721 1722 #ifdef CONFIG_PM 1723 static int dwc3_core_init_for_resume(struct dwc3 *dwc) 1724 { 1725 int ret; 1726 1727 ret = reset_control_deassert(dwc->reset); 1728 if (ret) 1729 return ret; 1730 1731 ret = clk_bulk_prepare_enable(dwc->num_clks, dwc->clks); 1732 if (ret) 1733 goto assert_reset; 1734 1735 ret = dwc3_core_init(dwc); 1736 if (ret) 1737 goto disable_clks; 1738 1739 return 0; 1740 1741 disable_clks: 1742 clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks); 1743 assert_reset: 1744 reset_control_assert(dwc->reset); 1745 1746 return ret; 1747 } 1748 1749 static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) 1750 { 1751 unsigned long flags; 1752 u32 reg; 1753 1754 switch (dwc->current_dr_role) { 1755 case DWC3_GCTL_PRTCAP_DEVICE: 1756 if (pm_runtime_suspended(dwc->dev)) 1757 break; 1758 spin_lock_irqsave(&dwc->lock, flags); 1759 dwc3_gadget_suspend(dwc); 1760 spin_unlock_irqrestore(&dwc->lock, flags); 1761 synchronize_irq(dwc->irq_gadget); 1762 dwc3_core_exit(dwc); 1763 break; 1764 case DWC3_GCTL_PRTCAP_HOST: 1765 if (!PMSG_IS_AUTO(msg)) { 1766 dwc3_core_exit(dwc); 1767 break; 1768 } 1769 1770 /* Let controller to suspend HSPHY before PHY driver suspends */ 1771 if (dwc->dis_u2_susphy_quirk || 1772 dwc->dis_enblslpm_quirk) { 1773 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 1774 reg |= DWC3_GUSB2PHYCFG_ENBLSLPM | 1775 DWC3_GUSB2PHYCFG_SUSPHY; 1776 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 1777 1778 /* Give some time for USB2 PHY to suspend */ 1779 usleep_range(5000, 6000); 1780 } 1781 1782 phy_pm_runtime_put_sync(dwc->usb2_generic_phy); 1783 phy_pm_runtime_put_sync(dwc->usb3_generic_phy); 1784 break; 1785 case DWC3_GCTL_PRTCAP_OTG: 1786 /* do nothing during runtime_suspend */ 1787 if (PMSG_IS_AUTO(msg)) 1788 break; 1789 1790 if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) { 1791 spin_lock_irqsave(&dwc->lock, flags); 1792 dwc3_gadget_suspend(dwc); 1793 spin_unlock_irqrestore(&dwc->lock, flags); 1794 synchronize_irq(dwc->irq_gadget); 1795 } 1796 1797 dwc3_otg_exit(dwc); 1798 dwc3_core_exit(dwc); 1799 break; 1800 default: 1801 /* do nothing */ 1802 break; 1803 } 1804 1805 return 0; 1806 } 1807 1808 static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) 1809 { 1810 unsigned long flags; 1811 int ret; 1812 u32 reg; 1813 1814 switch (dwc->current_dr_role) { 1815 case DWC3_GCTL_PRTCAP_DEVICE: 1816 ret = dwc3_core_init_for_resume(dwc); 1817 if (ret) 1818 return ret; 1819 1820 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE); 1821 spin_lock_irqsave(&dwc->lock, flags); 1822 dwc3_gadget_resume(dwc); 1823 spin_unlock_irqrestore(&dwc->lock, flags); 1824 break; 1825 case DWC3_GCTL_PRTCAP_HOST: 1826 if (!PMSG_IS_AUTO(msg)) { 1827 ret = dwc3_core_init_for_resume(dwc); 1828 if (ret) 1829 return ret; 1830 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); 1831 break; 1832 } 1833 /* Restore GUSB2PHYCFG bits that were modified in suspend */ 1834 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); 1835 if (dwc->dis_u2_susphy_quirk) 1836 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; 1837 1838 if (dwc->dis_enblslpm_quirk) 1839 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM; 1840 1841 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); 1842 1843 phy_pm_runtime_get_sync(dwc->usb2_generic_phy); 1844 phy_pm_runtime_get_sync(dwc->usb3_generic_phy); 1845 break; 1846 case DWC3_GCTL_PRTCAP_OTG: 1847 /* nothing to do on runtime_resume */ 1848 if (PMSG_IS_AUTO(msg)) 1849 break; 1850 1851 ret = dwc3_core_init_for_resume(dwc); 1852 if (ret) 1853 return ret; 1854 1855 dwc3_set_prtcap(dwc, dwc->current_dr_role); 1856 1857 dwc3_otg_init(dwc); 1858 if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST) { 1859 dwc3_otg_host_init(dwc); 1860 } else if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) { 1861 spin_lock_irqsave(&dwc->lock, flags); 1862 dwc3_gadget_resume(dwc); 1863 spin_unlock_irqrestore(&dwc->lock, flags); 1864 } 1865 1866 break; 1867 default: 1868 /* do nothing */ 1869 break; 1870 } 1871 1872 return 0; 1873 } 1874 1875 static int dwc3_runtime_checks(struct dwc3 *dwc) 1876 { 1877 switch (dwc->current_dr_role) { 1878 case DWC3_GCTL_PRTCAP_DEVICE: 1879 if (dwc->connected) 1880 return -EBUSY; 1881 break; 1882 case DWC3_GCTL_PRTCAP_HOST: 1883 default: 1884 /* do nothing */ 1885 break; 1886 } 1887 1888 return 0; 1889 } 1890 1891 static int dwc3_runtime_suspend(struct device *dev) 1892 { 1893 struct dwc3 *dwc = dev_get_drvdata(dev); 1894 int ret; 1895 1896 if (dwc3_runtime_checks(dwc)) 1897 return -EBUSY; 1898 1899 ret = dwc3_suspend_common(dwc, PMSG_AUTO_SUSPEND); 1900 if (ret) 1901 return ret; 1902 1903 device_init_wakeup(dev, true); 1904 1905 return 0; 1906 } 1907 1908 static int dwc3_runtime_resume(struct device *dev) 1909 { 1910 struct dwc3 *dwc = dev_get_drvdata(dev); 1911 int ret; 1912 1913 device_init_wakeup(dev, false); 1914 1915 ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME); 1916 if (ret) 1917 return ret; 1918 1919 switch (dwc->current_dr_role) { 1920 case DWC3_GCTL_PRTCAP_DEVICE: 1921 dwc3_gadget_process_pending_events(dwc); 1922 break; 1923 case DWC3_GCTL_PRTCAP_HOST: 1924 default: 1925 /* do nothing */ 1926 break; 1927 } 1928 1929 pm_runtime_mark_last_busy(dev); 1930 1931 return 0; 1932 } 1933 1934 static int dwc3_runtime_idle(struct device *dev) 1935 { 1936 struct dwc3 *dwc = dev_get_drvdata(dev); 1937 1938 switch (dwc->current_dr_role) { 1939 case DWC3_GCTL_PRTCAP_DEVICE: 1940 if (dwc3_runtime_checks(dwc)) 1941 return -EBUSY; 1942 break; 1943 case DWC3_GCTL_PRTCAP_HOST: 1944 default: 1945 /* do nothing */ 1946 break; 1947 } 1948 1949 pm_runtime_mark_last_busy(dev); 1950 pm_runtime_autosuspend(dev); 1951 1952 return 0; 1953 } 1954 #endif /* CONFIG_PM */ 1955 1956 #ifdef CONFIG_PM_SLEEP 1957 static int dwc3_suspend(struct device *dev) 1958 { 1959 struct dwc3 *dwc = dev_get_drvdata(dev); 1960 int ret; 1961 1962 ret = dwc3_suspend_common(dwc, PMSG_SUSPEND); 1963 if (ret) 1964 return ret; 1965 1966 pinctrl_pm_select_sleep_state(dev); 1967 1968 return 0; 1969 } 1970 1971 static int dwc3_resume(struct device *dev) 1972 { 1973 struct dwc3 *dwc = dev_get_drvdata(dev); 1974 int ret; 1975 1976 pinctrl_pm_select_default_state(dev); 1977 1978 ret = dwc3_resume_common(dwc, PMSG_RESUME); 1979 if (ret) 1980 return ret; 1981 1982 pm_runtime_disable(dev); 1983 pm_runtime_set_active(dev); 1984 pm_runtime_enable(dev); 1985 1986 return 0; 1987 } 1988 1989 static void dwc3_complete(struct device *dev) 1990 { 1991 struct dwc3 *dwc = dev_get_drvdata(dev); 1992 u32 reg; 1993 1994 if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST && 1995 dwc->dis_split_quirk) { 1996 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3); 1997 reg |= DWC3_GUCTL3_SPLITDISABLE; 1998 dwc3_writel(dwc->regs, DWC3_GUCTL3, reg); 1999 } 2000 } 2001 #else 2002 #define dwc3_complete NULL 2003 #endif /* CONFIG_PM_SLEEP */ 2004 2005 static const struct dev_pm_ops dwc3_dev_pm_ops = { 2006 SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume) 2007 .complete = dwc3_complete, 2008 SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume, 2009 dwc3_runtime_idle) 2010 }; 2011 2012 #ifdef CONFIG_OF 2013 static const struct of_device_id of_dwc3_match[] = { 2014 { 2015 .compatible = "snps,dwc3" 2016 }, 2017 { 2018 .compatible = "synopsys,dwc3" 2019 }, 2020 { }, 2021 }; 2022 MODULE_DEVICE_TABLE(of, of_dwc3_match); 2023 #endif 2024 2025 #ifdef CONFIG_ACPI 2026 2027 #define ACPI_ID_INTEL_BSW "808622B7" 2028 2029 static const struct acpi_device_id dwc3_acpi_match[] = { 2030 { ACPI_ID_INTEL_BSW, 0 }, 2031 { }, 2032 }; 2033 MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match); 2034 #endif 2035 2036 static struct platform_driver dwc3_driver = { 2037 .probe = dwc3_probe, 2038 .remove = dwc3_remove, 2039 .driver = { 2040 .name = "dwc3", 2041 .of_match_table = of_match_ptr(of_dwc3_match), 2042 .acpi_match_table = ACPI_PTR(dwc3_acpi_match), 2043 .pm = &dwc3_dev_pm_ops, 2044 }, 2045 }; 2046 2047 module_platform_driver(dwc3_driver); 2048 2049 MODULE_ALIAS("platform:dwc3"); 2050 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 2051 MODULE_LICENSE("GPL v2"); 2052 MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver"); 2053