drivers/usb/dwc3/core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * core.c - DesignWare USB3 DRD Controller Core file
   4  *
   5  * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com
   6  *
   7  * Authors: Felipe Balbi <balbi@ti.com>,
   8  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   9  */
  10
  11 #include <linux/clk.h>
  12 #include <linux/version.h>
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/slab.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/ioport.h>
  21 #include <linux/io.h>
  22 #include <linux/list.h>
  23 #include <linux/delay.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/of.h>
  26 #include <linux/of_graph.h>
  27 #include <linux/acpi.h>
  28 #include <linux/pinctrl/consumer.h>
  29 #include <linux/reset.h>
  30 #include <linux/bitfield.h>
  31
  32 #include <linux/usb/ch9.h>
  33 #include <linux/usb/gadget.h>
  34 #include <linux/usb/of.h>
  35 #include <linux/usb/otg.h>
  36
  37 #include "core.h"
  38 #include "gadget.h"
  39 #include "io.h"
  40
  41 #include "debug.h"
  42
  43 #define DWC3_DEFAULT_AUTOSUSPEND_DELAY  5000 /* ms */
  44
  45 /**
  46  * dwc3_get_dr_mode - Validates and sets dr_mode
  47  * @dwc: pointer to our context structure
  48  */
  49 static int dwc3_get_dr_mode(struct dwc3 *dwc)
  50 {
  51         enum usb_dr_mode mode;
  52         struct device *dev = dwc->dev;
  53         unsigned int hw_mode;
  54
  55         if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
  56                 dwc->dr_mode = USB_DR_MODE_OTG;
  57
  58         mode = dwc->dr_mode;
  59         hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
  60
  61         switch (hw_mode) {
  62         case DWC3_GHWPARAMS0_MODE_GADGET:
  63                 if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) {
  64                         dev_err(dev,
  65                                 "Controller does not support host mode.\n");
  66                         return -EINVAL;
  67                 }
  68                 mode = USB_DR_MODE_PERIPHERAL;
  69                 break;
  70         case DWC3_GHWPARAMS0_MODE_HOST:
  71                 if (IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
  72                         dev_err(dev,
  73                                 "Controller does not support device mode.\n");
  74                         return -EINVAL;
  75                 }
  76                 mode = USB_DR_MODE_HOST;
  77                 break;
  78         default:
  79                 if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
  80                         mode = USB_DR_MODE_HOST;
  81                 else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
  82                         mode = USB_DR_MODE_PERIPHERAL;
  83
  84                 /*
  85                  * DWC_usb31 and DWC_usb3 v3.30a and higher do not support OTG
  86                  * mode. If the controller supports DRD but the dr_mode is not
  87                  * specified or set to OTG, then set the mode to peripheral.
  88                  */
  89                 if (mode == USB_DR_MODE_OTG && !dwc->edev &&
  90                     (!IS_ENABLED(CONFIG_USB_ROLE_SWITCH) ||
  91                      !device_property_read_bool(dwc->dev, "usb-role-switch")) &&
  92                     !DWC3_VER_IS_PRIOR(DWC3, 330A))
  93                         mode = USB_DR_MODE_PERIPHERAL;
  94         }
  95
  96         if (mode != dwc->dr_mode) {
  97                 dev_warn(dev,
  98                          "Configuration mismatch. dr_mode forced to %s\n",
  99                          mode == USB_DR_MODE_HOST ? "host" : "gadget");
 100
 101                 dwc->dr_mode = mode;
 102         }
 103
 104         return 0;
 105 }
 106
 107 void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode)
 108 {
 109         u32 reg;
 110
 111         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 112         reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
 113         reg |= DWC3_GCTL_PRTCAPDIR(mode);
 114         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 115
 116         dwc->current_dr_role = mode;
 117 }
 118
 119 static void __dwc3_set_mode(struct work_struct *work)
 120 {
 121         struct dwc3 *dwc = work_to_dwc(work);
 122         unsigned long flags;
 123         int ret;
 124         u32 reg;
 125         u32 desired_dr_role;
 126
 127         mutex_lock(&dwc->mutex);
 128         spin_lock_irqsave(&dwc->lock, flags);
 129         desired_dr_role = dwc->desired_dr_role;
 130         spin_unlock_irqrestore(&dwc->lock, flags);
 131
 132         pm_runtime_get_sync(dwc->dev);
 133
 134         if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG)
 135                 dwc3_otg_update(dwc, 0);
 136
 137         if (!desired_dr_role)
 138                 goto out;
 139
 140         if (desired_dr_role == dwc->current_dr_role)
 141                 goto out;
 142
 143         if (desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev)
 144                 goto out;
 145
 146         switch (dwc->current_dr_role) {
 147         case DWC3_GCTL_PRTCAP_HOST:
 148                 dwc3_host_exit(dwc);
 149                 break;
 150         case DWC3_GCTL_PRTCAP_DEVICE:
 151                 dwc3_gadget_exit(dwc);
 152                 dwc3_event_buffers_cleanup(dwc);
 153                 break;
 154         case DWC3_GCTL_PRTCAP_OTG:
 155                 dwc3_otg_exit(dwc);
 156                 spin_lock_irqsave(&dwc->lock, flags);
 157                 dwc->desired_otg_role = DWC3_OTG_ROLE_IDLE;
 158                 spin_unlock_irqrestore(&dwc->lock, flags);
 159                 dwc3_otg_update(dwc, 1);
 160                 break;
 161         default:
 162                 break;
 163         }
 164
 165         /*
 166          * When current_dr_role is not set, there's no role switching.
 167          * Only perform GCTL.CoreSoftReset when there's DRD role switching.
 168          */
 169         if (dwc->current_dr_role && ((DWC3_IP_IS(DWC3) ||
 170                         DWC3_VER_IS_PRIOR(DWC31, 190A)) &&
 171                         desired_dr_role != DWC3_GCTL_PRTCAP_OTG)) {
 172                 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 173                 reg |= DWC3_GCTL_CORESOFTRESET;
 174                 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 175
 176                 /*
 177                  * Wait for internal clocks to synchronized. DWC_usb31 and
 178                  * DWC_usb32 may need at least 50ms (less for DWC_usb3). To
 179                  * keep it consistent across different IPs, let's wait up to
 180                  * 100ms before clearing GCTL.CORESOFTRESET.
 181                  */
 182                 msleep(100);
 183
 184                 reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 185                 reg &= ~DWC3_GCTL_CORESOFTRESET;
 186                 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 187         }
 188
 189         spin_lock_irqsave(&dwc->lock, flags);
 190
 191         dwc3_set_prtcap(dwc, desired_dr_role);
 192
 193         spin_unlock_irqrestore(&dwc->lock, flags);
 194
 195         switch (desired_dr_role) {
 196         case DWC3_GCTL_PRTCAP_HOST:
 197                 ret = dwc3_host_init(dwc);
 198                 if (ret) {
 199                         dev_err(dwc->dev, "failed to initialize host\n");
 200                 } else {
 201                         if (dwc->usb2_phy)
 202                                 otg_set_vbus(dwc->usb2_phy->otg, true);
 203                         phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
 204                         phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
 205                         if (dwc->dis_split_quirk) {
 206                                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
 207                                 reg |= DWC3_GUCTL3_SPLITDISABLE;
 208                                 dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
 209                         }
 210                 }
 211                 break;
 212         case DWC3_GCTL_PRTCAP_DEVICE:
 213                 dwc3_core_soft_reset(dwc);
 214
 215                 dwc3_event_buffers_setup(dwc);
 216
 217                 if (dwc->usb2_phy)
 218                         otg_set_vbus(dwc->usb2_phy->otg, false);
 219                 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
 220                 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
 221
 222                 ret = dwc3_gadget_init(dwc);
 223                 if (ret)
 224                         dev_err(dwc->dev, "failed to initialize peripheral\n");
 225                 break;
 226         case DWC3_GCTL_PRTCAP_OTG:
 227                 dwc3_otg_init(dwc);
 228                 dwc3_otg_update(dwc, 0);
 229                 break;
 230         default:
 231                 break;
 232         }
 233
 234 out:
 235         pm_runtime_mark_last_busy(dwc->dev);
 236         pm_runtime_put_autosuspend(dwc->dev);
 237         mutex_unlock(&dwc->mutex);
 238 }
 239
 240 void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
 241 {
 242         unsigned long flags;
 243
 244         if (dwc->dr_mode != USB_DR_MODE_OTG)
 245                 return;
 246
 247         spin_lock_irqsave(&dwc->lock, flags);
 248         dwc->desired_dr_role = mode;
 249         spin_unlock_irqrestore(&dwc->lock, flags);
 250
 251         queue_work(system_freezable_wq, &dwc->drd_work);
 252 }
 253
 254 u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type)
 255 {
 256         struct dwc3             *dwc = dep->dwc;
 257         u32                     reg;
 258
 259         dwc3_writel(dwc->regs, DWC3_GDBGFIFOSPACE,
 260                         DWC3_GDBGFIFOSPACE_NUM(dep->number) |
 261                         DWC3_GDBGFIFOSPACE_TYPE(type));
 262
 263         reg = dwc3_readl(dwc->regs, DWC3_GDBGFIFOSPACE);
 264
 265         return DWC3_GDBGFIFOSPACE_SPACE_AVAILABLE(reg);
 266 }
 267
 268 /**
 269  * dwc3_core_soft_reset - Issues core soft reset and PHY reset
 270  * @dwc: pointer to our context structure
 271  */
 272 int dwc3_core_soft_reset(struct dwc3 *dwc)
 273 {
 274         u32             reg;
 275         int             retries = 1000;
 276
 277         /*
 278          * We're resetting only the device side because, if we're in host mode,
 279          * XHCI driver will reset the host block. If dwc3 was configured for
 280          * host-only mode, then we can return early.
 281          */
 282         if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
 283                 return 0;
 284
 285         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 286         reg |= DWC3_DCTL_CSFTRST;
 287         reg &= ~DWC3_DCTL_RUN_STOP;
 288         dwc3_gadget_dctl_write_safe(dwc, reg);
 289
 290         /*
 291          * For DWC_usb31 controller 1.90a and later, the DCTL.CSFRST bit
 292          * is cleared only after all the clocks are synchronized. This can
 293          * take a little more than 50ms. Set the polling rate at 20ms
 294          * for 10 times instead.
 295          */
 296         if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32))
 297                 retries = 10;
 298
 299         do {
 300                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 301                 if (!(reg & DWC3_DCTL_CSFTRST))
 302                         goto done;
 303
 304                 if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32))
 305                         msleep(20);
 306                 else
 307                         udelay(1);
 308         } while (--retries);
 309
 310         dev_warn(dwc->dev, "DWC3 controller soft reset failed.\n");
 311         return -ETIMEDOUT;
 312
 313 done:
 314         /*
 315          * For DWC_usb31 controller 1.80a and prior, once DCTL.CSFRST bit
 316          * is cleared, we must wait at least 50ms before accessing the PHY
 317          * domain (synchronization delay).
 318          */
 319         if (DWC3_VER_IS_WITHIN(DWC31, ANY, 180A))
 320                 msleep(50);
 321
 322         return 0;
 323 }
 324
 325 /*
 326  * dwc3_frame_length_adjustment - Adjusts frame length if required
 327  * @dwc3: Pointer to our controller context structure
 328  */
 329 static void dwc3_frame_length_adjustment(struct dwc3 *dwc)
 330 {
 331         u32 reg;
 332         u32 dft;
 333
 334         if (DWC3_VER_IS_PRIOR(DWC3, 250A))
 335                 return;
 336
 337         if (dwc->fladj == 0)
 338                 return;
 339
 340         reg = dwc3_readl(dwc->regs, DWC3_GFLADJ);
 341         dft = reg & DWC3_GFLADJ_30MHZ_MASK;
 342         if (dft != dwc->fladj) {
 343                 reg &= ~DWC3_GFLADJ_30MHZ_MASK;
 344                 reg |= DWC3_GFLADJ_30MHZ_SDBND_SEL | dwc->fladj;
 345                 dwc3_writel(dwc->regs, DWC3_GFLADJ, reg);
 346         }
 347 }
 348
 349 /**
 350  * dwc3_ref_clk_period - Reference clock period configuration
 351  *              Default reference clock period depends on hardware
 352  *              configuration. For systems with reference clock that differs
 353  *              from the default, this will set clock period in DWC3_GUCTL
 354  *              register.
 355  * @dwc: Pointer to our controller context structure
 356  */
 357 static void dwc3_ref_clk_period(struct dwc3 *dwc)
 358 {
 359         unsigned long period;
 360         unsigned long fladj;
 361         unsigned long decr;
 362         unsigned long rate;
 363         u32 reg;
 364
 365         if (dwc->ref_clk) {
 366                 rate = clk_get_rate(dwc->ref_clk);
 367                 if (!rate)
 368                         return;
 369                 period = NSEC_PER_SEC / rate;
 370         } else if (dwc->ref_clk_per) {
 371                 period = dwc->ref_clk_per;
 372                 rate = NSEC_PER_SEC / period;
 373         } else {
 374                 return;
 375         }
 376
 377         reg = dwc3_readl(dwc->regs, DWC3_GUCTL);
 378         reg &= ~DWC3_GUCTL_REFCLKPER_MASK;
 379         reg |=  FIELD_PREP(DWC3_GUCTL_REFCLKPER_MASK, period);
 380         dwc3_writel(dwc->regs, DWC3_GUCTL, reg);
 381
 382         if (DWC3_VER_IS_PRIOR(DWC3, 250A))
 383                 return;
 384
 385         /*
 386          * The calculation below is
 387          *
 388          * 125000 * (NSEC_PER_SEC / (rate * period) - 1)
 389          *
 390          * but rearranged for fixed-point arithmetic. The division must be
 391          * 64-bit because 125000 * NSEC_PER_SEC doesn't fit in 32 bits (and
 392          * neither does rate * period).
 393          *
 394          * Note that rate * period ~= NSEC_PER_SECOND, minus the number of
 395          * nanoseconds of error caused by the truncation which happened during
 396          * the division when calculating rate or period (whichever one was
 397          * derived from the other). We first calculate the relative error, then
 398          * scale it to units of 8 ppm.
 399          */
 400         fladj = div64_u64(125000ULL * NSEC_PER_SEC, (u64)rate * period);
 401         fladj -= 125000;
 402
 403         /*
 404          * The documented 240MHz constant is scaled by 2 to get PLS1 as well.
 405          */
 406         decr = 480000000 / rate;
 407
 408         reg = dwc3_readl(dwc->regs, DWC3_GFLADJ);
 409         reg &= ~DWC3_GFLADJ_REFCLK_FLADJ_MASK
 410             &  ~DWC3_GFLADJ_240MHZDECR
 411             &  ~DWC3_GFLADJ_240MHZDECR_PLS1;
 412         reg |= FIELD_PREP(DWC3_GFLADJ_REFCLK_FLADJ_MASK, fladj)
 413             |  FIELD_PREP(DWC3_GFLADJ_240MHZDECR, decr >> 1)
 414             |  FIELD_PREP(DWC3_GFLADJ_240MHZDECR_PLS1, decr & 1);
 415
 416         if (dwc->gfladj_refclk_lpm_sel)
 417                 reg |=  DWC3_GFLADJ_REFCLK_LPM_SEL;
 418
 419         dwc3_writel(dwc->regs, DWC3_GFLADJ, reg);
 420 }
 421
 422 /**
 423  * dwc3_free_one_event_buffer - Frees one event buffer
 424  * @dwc: Pointer to our controller context structure
 425  * @evt: Pointer to event buffer to be freed
 426  */
 427 static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
 428                 struct dwc3_event_buffer *evt)
 429 {
 430         dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma);
 431 }
 432
 433 /**
 434  * dwc3_alloc_one_event_buffer - Allocates one event buffer structure
 435  * @dwc: Pointer to our controller context structure
 436  * @length: size of the event buffer
 437  *
 438  * Returns a pointer to the allocated event buffer structure on success
 439  * otherwise ERR_PTR(errno).
 440  */
 441 static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,
 442                 unsigned int length)
 443 {
 444         struct dwc3_event_buffer        *evt;
 445
 446         evt = devm_kzalloc(dwc->dev, sizeof(*evt), GFP_KERNEL);
 447         if (!evt)
 448                 return ERR_PTR(-ENOMEM);
 449
 450         evt->dwc        = dwc;
 451         evt->length     = length;
 452         evt->cache      = devm_kzalloc(dwc->dev, length, GFP_KERNEL);
 453         if (!evt->cache)
 454                 return ERR_PTR(-ENOMEM);
 455
 456         evt->buf        = dma_alloc_coherent(dwc->sysdev, length,
 457                         &evt->dma, GFP_KERNEL);
 458         if (!evt->buf)
 459                 return ERR_PTR(-ENOMEM);
 460
 461         return evt;
 462 }
 463
 464 /**
 465  * dwc3_free_event_buffers - frees all allocated event buffers
 466  * @dwc: Pointer to our controller context structure
 467  */
 468 static void dwc3_free_event_buffers(struct dwc3 *dwc)
 469 {
 470         struct dwc3_event_buffer        *evt;
 471
 472         evt = dwc->ev_buf;
 473         if (evt)
 474                 dwc3_free_one_event_buffer(dwc, evt);
 475 }
 476
 477 /**
 478  * dwc3_alloc_event_buffers - Allocates @num event buffers of size @length
 479  * @dwc: pointer to our controller context structure
 480  * @length: size of event buffer
 481  *
 482  * Returns 0 on success otherwise negative errno. In the error case, dwc
 483  * may contain some buffers allocated but not all which were requested.
 484  */
 485 static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned int length)
 486 {
 487         struct dwc3_event_buffer *evt;
 488
 489         evt = dwc3_alloc_one_event_buffer(dwc, length);
 490         if (IS_ERR(evt)) {
 491                 dev_err(dwc->dev, "can't allocate event buffer\n");
 492                 return PTR_ERR(evt);
 493         }
 494         dwc->ev_buf = evt;
 495
 496         return 0;
 497 }
 498
 499 /**
 500  * dwc3_event_buffers_setup - setup our allocated event buffers
 501  * @dwc: pointer to our controller context structure
 502  *
 503  * Returns 0 on success otherwise negative errno.
 504  */
 505 int dwc3_event_buffers_setup(struct dwc3 *dwc)
 506 {
 507         struct dwc3_event_buffer        *evt;
 508
 509         evt = dwc->ev_buf;
 510         evt->lpos = 0;
 511         dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0),
 512                         lower_32_bits(evt->dma));
 513         dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0),
 514                         upper_32_bits(evt->dma));
 515         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
 516                         DWC3_GEVNTSIZ_SIZE(evt->length));
 517         dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
 518
 519         return 0;
 520 }
 521
 522 void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
 523 {
 524         struct dwc3_event_buffer        *evt;
 525
 526         evt = dwc->ev_buf;
 527
 528         evt->lpos = 0;
 529
 530         dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), 0);
 531         dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0), 0);
 532         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), DWC3_GEVNTSIZ_INTMASK
 533                         | DWC3_GEVNTSIZ_SIZE(0));
 534         dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
 535 }
 536
 537 static void dwc3_core_num_eps(struct dwc3 *dwc)
 538 {
 539         struct dwc3_hwparams    *parms = &dwc->hwparams;
 540
 541         dwc->num_eps = DWC3_NUM_EPS(parms);
 542 }
 543
 544 static void dwc3_cache_hwparams(struct dwc3 *dwc)
 545 {
 546         struct dwc3_hwparams    *parms = &dwc->hwparams;
 547
 548         parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0);
 549         parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1);
 550         parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2);
 551         parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3);
 552         parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4);
 553         parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5);
 554         parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6);
 555         parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7);
 556         parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
 557
 558         if (DWC3_IP_IS(DWC32))
 559                 parms->hwparams9 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS9);
 560 }
 561
 562 static int dwc3_core_ulpi_init(struct dwc3 *dwc)
 563 {
 564         int intf;
 565         int ret = 0;
 566
 567         intf = DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3);
 568
 569         if (intf == DWC3_GHWPARAMS3_HSPHY_IFC_ULPI ||
 570             (intf == DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI &&
 571              dwc->hsphy_interface &&
 572              !strncmp(dwc->hsphy_interface, "ulpi", 4)))
 573                 ret = dwc3_ulpi_init(dwc);
 574
 575         return ret;
 576 }
 577
 578 /**
 579  * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core
 580  * @dwc: Pointer to our controller context structure
 581  *
 582  * Returns 0 on success. The USB PHY interfaces are configured but not
 583  * initialized. The PHY interfaces and the PHYs get initialized together with
 584  * the core in dwc3_core_init.
 585  */
 586 static int dwc3_phy_setup(struct dwc3 *dwc)
 587 {
 588         unsigned int hw_mode;
 589         u32 reg;
 590
 591         hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
 592
 593         reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
 594
 595         /*
 596          * Make sure UX_EXIT_PX is cleared as that causes issues with some
 597          * PHYs. Also, this bit is not supposed to be used in normal operation.
 598          */
 599         reg &= ~DWC3_GUSB3PIPECTL_UX_EXIT_PX;
 600
 601         /*
 602          * Above 1.94a, it is recommended to set DWC3_GUSB3PIPECTL_SUSPHY
 603          * to '0' during coreConsultant configuration. So default value
 604          * will be '0' when the core is reset. Application needs to set it
 605          * to '1' after the core initialization is completed.
 606          */
 607         if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A))
 608                 reg |= DWC3_GUSB3PIPECTL_SUSPHY;
 609
 610         /*
 611          * For DRD controllers, GUSB3PIPECTL.SUSPENDENABLE must be cleared after
 612          * power-on reset, and it can be set after core initialization, which is
 613          * after device soft-reset during initialization.
 614          */
 615         if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD)
 616                 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
 617
 618         if (dwc->u2ss_inp3_quirk)
 619                 reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK;
 620
 621         if (dwc->dis_rxdet_inp3_quirk)
 622                 reg |= DWC3_GUSB3PIPECTL_DISRXDETINP3;
 623
 624         if (dwc->req_p1p2p3_quirk)
 625                 reg |= DWC3_GUSB3PIPECTL_REQP1P2P3;
 626
 627         if (dwc->del_p1p2p3_quirk)
 628                 reg |= DWC3_GUSB3PIPECTL_DEP1P2P3_EN;
 629
 630         if (dwc->del_phy_power_chg_quirk)
 631                 reg |= DWC3_GUSB3PIPECTL_DEPOCHANGE;
 632
 633         if (dwc->lfps_filter_quirk)
 634                 reg |= DWC3_GUSB3PIPECTL_LFPSFILT;
 635
 636         if (dwc->rx_detect_poll_quirk)
 637                 reg |= DWC3_GUSB3PIPECTL_RX_DETOPOLL;
 638
 639         if (dwc->tx_de_emphasis_quirk)
 640                 reg |= DWC3_GUSB3PIPECTL_TX_DEEPH(dwc->tx_de_emphasis);
 641
 642         if (dwc->dis_u3_susphy_quirk)
 643                 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
 644
 645         if (dwc->dis_del_phy_power_chg_quirk)
 646                 reg &= ~DWC3_GUSB3PIPECTL_DEPOCHANGE;
 647
 648         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 649
 650         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 651
 652         /* Select the HS PHY interface */
 653         switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) {
 654         case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI:
 655                 if (dwc->hsphy_interface &&
 656                                 !strncmp(dwc->hsphy_interface, "utmi", 4)) {
 657                         reg &= ~DWC3_GUSB2PHYCFG_ULPI_UTMI;
 658                         break;
 659                 } else if (dwc->hsphy_interface &&
 660                                 !strncmp(dwc->hsphy_interface, "ulpi", 4)) {
 661                         reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI;
 662                         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 663                 } else {
 664                         /* Relying on default value. */
 665                         if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI))
 666                                 break;
 667                 }
 668                 fallthrough;
 669         case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
 670         default:
 671                 break;
 672         }
 673
 674         switch (dwc->hsphy_mode) {
 675         case USBPHY_INTERFACE_MODE_UTMI:
 676                 reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
 677                        DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
 678                 reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_8_BIT) |
 679                        DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_8_BIT);
 680                 break;
 681         case USBPHY_INTERFACE_MODE_UTMIW:
 682                 reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
 683                        DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
 684                 reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_16_BIT) |
 685                        DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_16_BIT);
 686                 break;
 687         default:
 688                 break;
 689         }
 690
 691         /*
 692          * Above 1.94a, it is recommended to set DWC3_GUSB2PHYCFG_SUSPHY to
 693          * '0' during coreConsultant configuration. So default value will
 694          * be '0' when the core is reset. Application needs to set it to
 695          * '1' after the core initialization is completed.
 696          */
 697         if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A))
 698                 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
 699
 700         /*
 701          * For DRD controllers, GUSB2PHYCFG.SUSPHY must be cleared after
 702          * power-on reset, and it can be set after core initialization, which is
 703          * after device soft-reset during initialization.
 704          */
 705         if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD)
 706                 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
 707
 708         if (dwc->dis_u2_susphy_quirk)
 709                 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
 710
 711         if (dwc->dis_enblslpm_quirk)
 712                 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
 713         else
 714                 reg |= DWC3_GUSB2PHYCFG_ENBLSLPM;
 715
 716         if (dwc->dis_u2_freeclk_exists_quirk || dwc->gfladj_refclk_lpm_sel)
 717                 reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
 718
 719         /*
 720          * Some ULPI USB PHY does not support internal VBUS supply, to drive
 721          * the CPEN pin requires the configuration of the ULPI DRVVBUSEXTERNAL
 722          * bit of OTG_CTRL register. Controller configures the USB2 PHY
 723          * ULPIEXTVBUSDRV bit[17] of the GUSB2PHYCFG register to drive vBus
 724          * with an external supply.
 725          */
 726         if (dwc->ulpi_ext_vbus_drv)
 727                 reg |= DWC3_GUSB2PHYCFG_ULPIEXTVBUSDRV;
 728
 729         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 730
 731         return 0;
 732 }
 733
 734 static int dwc3_phy_init(struct dwc3 *dwc)
 735 {
 736         int ret;
 737
 738         usb_phy_init(dwc->usb2_phy);
 739         usb_phy_init(dwc->usb3_phy);
 740
 741         ret = phy_init(dwc->usb2_generic_phy);
 742         if (ret < 0)
 743                 goto err_shutdown_usb3_phy;
 744
 745         ret = phy_init(dwc->usb3_generic_phy);
 746         if (ret < 0)
 747                 goto err_exit_usb2_phy;
 748
 749         return 0;
 750
 751 err_exit_usb2_phy:
 752         phy_exit(dwc->usb2_generic_phy);
 753 err_shutdown_usb3_phy:
 754         usb_phy_shutdown(dwc->usb3_phy);
 755         usb_phy_shutdown(dwc->usb2_phy);
 756
 757         return ret;
 758 }
 759
 760 static void dwc3_phy_exit(struct dwc3 *dwc)
 761 {
 762         phy_exit(dwc->usb3_generic_phy);
 763         phy_exit(dwc->usb2_generic_phy);
 764
 765         usb_phy_shutdown(dwc->usb3_phy);
 766         usb_phy_shutdown(dwc->usb2_phy);
 767 }
 768
 769 static int dwc3_phy_power_on(struct dwc3 *dwc)
 770 {
 771         int ret;
 772
 773         usb_phy_set_suspend(dwc->usb2_phy, 0);
 774         usb_phy_set_suspend(dwc->usb3_phy, 0);
 775
 776         ret = phy_power_on(dwc->usb2_generic_phy);
 777         if (ret < 0)
 778                 goto err_suspend_usb3_phy;
 779
 780         ret = phy_power_on(dwc->usb3_generic_phy);
 781         if (ret < 0)
 782                 goto err_power_off_usb2_phy;
 783
 784         return 0;
 785
 786 err_power_off_usb2_phy:
 787         phy_power_off(dwc->usb2_generic_phy);
 788 err_suspend_usb3_phy:
 789         usb_phy_set_suspend(dwc->usb3_phy, 1);
 790         usb_phy_set_suspend(dwc->usb2_phy, 1);
 791
 792         return ret;
 793 }
 794
 795 static void dwc3_phy_power_off(struct dwc3 *dwc)
 796 {
 797         phy_power_off(dwc->usb3_generic_phy);
 798         phy_power_off(dwc->usb2_generic_phy);
 799
 800         usb_phy_set_suspend(dwc->usb3_phy, 1);
 801         usb_phy_set_suspend(dwc->usb2_phy, 1);
 802 }
 803
 804 static int dwc3_clk_enable(struct dwc3 *dwc)
 805 {
 806         int ret;
 807
 808         ret = clk_prepare_enable(dwc->bus_clk);
 809         if (ret)
 810                 return ret;
 811
 812         ret = clk_prepare_enable(dwc->ref_clk);
 813         if (ret)
 814                 goto disable_bus_clk;
 815
 816         ret = clk_prepare_enable(dwc->susp_clk);
 817         if (ret)
 818                 goto disable_ref_clk;
 819
 820         ret = clk_prepare_enable(dwc->utmi_clk);
 821         if (ret)
 822                 goto disable_susp_clk;
 823
 824         ret = clk_prepare_enable(dwc->pipe_clk);
 825         if (ret)
 826                 goto disable_utmi_clk;
 827
 828         return 0;
 829
 830 disable_utmi_clk:
 831         clk_disable_unprepare(dwc->utmi_clk);
 832 disable_susp_clk:
 833         clk_disable_unprepare(dwc->susp_clk);
 834 disable_ref_clk:
 835         clk_disable_unprepare(dwc->ref_clk);
 836 disable_bus_clk:
 837         clk_disable_unprepare(dwc->bus_clk);
 838         return ret;
 839 }
 840
 841 static void dwc3_clk_disable(struct dwc3 *dwc)
 842 {
 843         clk_disable_unprepare(dwc->pipe_clk);
 844         clk_disable_unprepare(dwc->utmi_clk);
 845         clk_disable_unprepare(dwc->susp_clk);
 846         clk_disable_unprepare(dwc->ref_clk);
 847         clk_disable_unprepare(dwc->bus_clk);
 848 }
 849
 850 static void dwc3_core_exit(struct dwc3 *dwc)
 851 {
 852         dwc3_event_buffers_cleanup(dwc);
 853         dwc3_phy_power_off(dwc);
 854         dwc3_phy_exit(dwc);
 855         dwc3_clk_disable(dwc);
 856         reset_control_assert(dwc->reset);
 857 }
 858
 859 static bool dwc3_core_is_valid(struct dwc3 *dwc)
 860 {
 861         u32 reg;
 862
 863         reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
 864         dwc->ip = DWC3_GSNPS_ID(reg);
 865
 866         /* This should read as U3 followed by revision number */
 867         if (DWC3_IP_IS(DWC3)) {
 868                 dwc->revision = reg;
 869         } else if (DWC3_IP_IS(DWC31) || DWC3_IP_IS(DWC32)) {
 870                 dwc->revision = dwc3_readl(dwc->regs, DWC3_VER_NUMBER);
 871                 dwc->version_type = dwc3_readl(dwc->regs, DWC3_VER_TYPE);
 872         } else {
 873                 return false;
 874         }
 875
 876         return true;
 877 }
 878
 879 static void dwc3_core_setup_global_control(struct dwc3 *dwc)
 880 {
 881         u32 reg;
 882
 883         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 884         reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
 885
 886         switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
 887         case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
 888                 /**
 889                  * WORKAROUND: DWC3 revisions between 2.10a and 2.50a have an
 890                  * issue which would cause xHCI compliance tests to fail.
 891                  *
 892                  * Because of that we cannot enable clock gating on such
 893                  * configurations.
 894                  *
 895                  * Refers to:
 896                  *
 897                  * STAR#9000588375: Clock Gating, SOF Issues when ref_clk-Based
 898                  * SOF/ITP Mode Used
 899                  */
 900                 if ((dwc->dr_mode == USB_DR_MODE_HOST ||
 901                                 dwc->dr_mode == USB_DR_MODE_OTG) &&
 902                                 DWC3_VER_IS_WITHIN(DWC3, 210A, 250A))
 903                         reg |= DWC3_GCTL_DSBLCLKGTNG | DWC3_GCTL_SOFITPSYNC;
 904                 else
 905                         reg &= ~DWC3_GCTL_DSBLCLKGTNG;
 906                 break;
 907         case DWC3_GHWPARAMS1_EN_PWROPT_HIB:
 908                 /*
 909                  * REVISIT Enabling this bit so that host-mode hibernation
 910                  * will work. Device-mode hibernation is not yet implemented.
 911                  */
 912                 reg |= DWC3_GCTL_GBLHIBERNATIONEN;
 913                 break;
 914         default:
 915                 /* nothing */
 916                 break;
 917         }
 918
 919         /* check if current dwc3 is on simulation board */
 920         if (dwc->hwparams.hwparams6 & DWC3_GHWPARAMS6_EN_FPGA) {
 921                 dev_info(dwc->dev, "Running with FPGA optimizations\n");
 922                 dwc->is_fpga = true;
 923         }
 924
 925         WARN_ONCE(dwc->disable_scramble_quirk && !dwc->is_fpga,
 926                         "disable_scramble cannot be used on non-FPGA builds\n");
 927
 928         if (dwc->disable_scramble_quirk && dwc->is_fpga)
 929                 reg |= DWC3_GCTL_DISSCRAMBLE;
 930         else
 931                 reg &= ~DWC3_GCTL_DISSCRAMBLE;
 932
 933         if (dwc->u2exit_lfps_quirk)
 934                 reg |= DWC3_GCTL_U2EXIT_LFPS;
 935
 936         /*
 937          * WORKAROUND: DWC3 revisions <1.90a have a bug
 938          * where the device can fail to connect at SuperSpeed
 939          * and falls back to high-speed mode which causes
 940          * the device to enter a Connect/Disconnect loop
 941          */
 942         if (DWC3_VER_IS_PRIOR(DWC3, 190A))
 943                 reg |= DWC3_GCTL_U2RSTECN;
 944
 945         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 946 }
 947
 948 static int dwc3_core_get_phy(struct dwc3 *dwc);
 949 static int dwc3_core_ulpi_init(struct dwc3 *dwc);
 950
 951 /* set global incr burst type configuration registers */
 952 static void dwc3_set_incr_burst_type(struct dwc3 *dwc)
 953 {
 954         struct device *dev = dwc->dev;
 955         /* incrx_mode : for INCR burst type. */
 956         bool incrx_mode;
 957         /* incrx_size : for size of INCRX burst. */
 958         u32 incrx_size;
 959         u32 *vals;
 960         u32 cfg;
 961         int ntype;
 962         int ret;
 963         int i;
 964
 965         cfg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0);
 966
 967         /*
 968          * Handle property "snps,incr-burst-type-adjustment".
 969          * Get the number of value from this property:
 970          * result <= 0, means this property is not supported.
 971          * result = 1, means INCRx burst mode supported.
 972          * result > 1, means undefined length burst mode supported.
 973          */
 974         ntype = device_property_count_u32(dev, "snps,incr-burst-type-adjustment");
 975         if (ntype <= 0)
 976                 return;
 977
 978         vals = kcalloc(ntype, sizeof(u32), GFP_KERNEL);
 979         if (!vals)
 980                 return;
 981
 982         /* Get INCR burst type, and parse it */
 983         ret = device_property_read_u32_array(dev,
 984                         "snps,incr-burst-type-adjustment", vals, ntype);
 985         if (ret) {
 986                 kfree(vals);
 987                 dev_err(dev, "Error to get property\n");
 988                 return;
 989         }
 990
 991         incrx_size = *vals;
 992
 993         if (ntype > 1) {
 994                 /* INCRX (undefined length) burst mode */
 995                 incrx_mode = INCRX_UNDEF_LENGTH_BURST_MODE;
 996                 for (i = 1; i < ntype; i++) {
 997                         if (vals[i] > incrx_size)
 998                                 incrx_size = vals[i];
 999                 }
1000         } else {
1001                 /* INCRX burst mode */
1002                 incrx_mode = INCRX_BURST_MODE;
1003         }
1004
1005         kfree(vals);
1006
1007         /* Enable Undefined Length INCR Burst and Enable INCRx Burst */
1008         cfg &= ~DWC3_GSBUSCFG0_INCRBRST_MASK;
1009         if (incrx_mode)
1010                 cfg |= DWC3_GSBUSCFG0_INCRBRSTENA;
1011         switch (incrx_size) {
1012         case 256:
1013                 cfg |= DWC3_GSBUSCFG0_INCR256BRSTENA;
1014                 break;
1015         case 128:
1016                 cfg |= DWC3_GSBUSCFG0_INCR128BRSTENA;
1017                 break;
1018         case 64:
1019                 cfg |= DWC3_GSBUSCFG0_INCR64BRSTENA;
1020                 break;
1021         case 32:
1022                 cfg |= DWC3_GSBUSCFG0_INCR32BRSTENA;
1023                 break;
1024         case 16:
1025                 cfg |= DWC3_GSBUSCFG0_INCR16BRSTENA;
1026                 break;
1027         case 8:
1028                 cfg |= DWC3_GSBUSCFG0_INCR8BRSTENA;
1029                 break;
1030         case 4:
1031                 cfg |= DWC3_GSBUSCFG0_INCR4BRSTENA;
1032                 break;
1033         case 1:
1034                 break;
1035         default:
1036                 dev_err(dev, "Invalid property\n");
1037                 break;
1038         }
1039
1040         dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, cfg);
1041 }
1042
1043 static void dwc3_set_power_down_clk_scale(struct dwc3 *dwc)
1044 {
1045         u32 scale;
1046         u32 reg;
1047
1048         if (!dwc->susp_clk)
1049                 return;
1050
1051         /*
1052          * The power down scale field specifies how many suspend_clk
1053          * periods fit into a 16KHz clock period. When performing
1054          * the division, round up the remainder.
1055          *
1056          * The power down scale value is calculated using the fastest
1057          * frequency of the suspend_clk. If it isn't fixed (but within
1058          * the accuracy requirement), the driver may not know the max
1059          * rate of the suspend_clk, so only update the power down scale
1060          * if the default is less than the calculated value from
1061          * clk_get_rate() or if the default is questionably high
1062          * (3x or more) to be within the requirement.
1063          */
1064         scale = DIV_ROUND_UP(clk_get_rate(dwc->susp_clk), 16000);
1065         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
1066         if ((reg & DWC3_GCTL_PWRDNSCALE_MASK) < DWC3_GCTL_PWRDNSCALE(scale) ||
1067             (reg & DWC3_GCTL_PWRDNSCALE_MASK) > DWC3_GCTL_PWRDNSCALE(scale*3)) {
1068                 reg &= ~(DWC3_GCTL_PWRDNSCALE_MASK);
1069                 reg |= DWC3_GCTL_PWRDNSCALE(scale);
1070                 dwc3_writel(dwc->regs, DWC3_GCTL, reg);
1071         }
1072 }
1073
1074 static void dwc3_config_threshold(struct dwc3 *dwc)
1075 {
1076         u32 reg;
1077         u8 rx_thr_num;
1078         u8 rx_maxburst;
1079         u8 tx_thr_num;
1080         u8 tx_maxburst;
1081
1082         /*
1083          * Must config both number of packets and max burst settings to enable
1084          * RX and/or TX threshold.
1085          */
1086         if (!DWC3_IP_IS(DWC3) && dwc->dr_mode == USB_DR_MODE_HOST) {
1087                 rx_thr_num = dwc->rx_thr_num_pkt_prd;
1088                 rx_maxburst = dwc->rx_max_burst_prd;
1089                 tx_thr_num = dwc->tx_thr_num_pkt_prd;
1090                 tx_maxburst = dwc->tx_max_burst_prd;
1091
1092                 if (rx_thr_num && rx_maxburst) {
1093                         reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
1094                         reg |= DWC31_RXTHRNUMPKTSEL_PRD;
1095
1096                         reg &= ~DWC31_RXTHRNUMPKT_PRD(~0);
1097                         reg |= DWC31_RXTHRNUMPKT_PRD(rx_thr_num);
1098
1099                         reg &= ~DWC31_MAXRXBURSTSIZE_PRD(~0);
1100                         reg |= DWC31_MAXRXBURSTSIZE_PRD(rx_maxburst);
1101
1102                         dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
1103                 }
1104
1105                 if (tx_thr_num && tx_maxburst) {
1106                         reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG);
1107                         reg |= DWC31_TXTHRNUMPKTSEL_PRD;
1108
1109                         reg &= ~DWC31_TXTHRNUMPKT_PRD(~0);
1110                         reg |= DWC31_TXTHRNUMPKT_PRD(tx_thr_num);
1111
1112                         reg &= ~DWC31_MAXTXBURSTSIZE_PRD(~0);
1113                         reg |= DWC31_MAXTXBURSTSIZE_PRD(tx_maxburst);
1114
1115                         dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg);
1116                 }
1117         }
1118
1119         rx_thr_num = dwc->rx_thr_num_pkt;
1120         rx_maxburst = dwc->rx_max_burst;
1121         tx_thr_num = dwc->tx_thr_num_pkt;
1122         tx_maxburst = dwc->tx_max_burst;
1123
1124         if (DWC3_IP_IS(DWC3)) {
1125                 if (rx_thr_num && rx_maxburst) {
1126                         reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
1127                         reg |= DWC3_GRXTHRCFG_PKTCNTSEL;
1128
1129                         reg &= ~DWC3_GRXTHRCFG_RXPKTCNT(~0);
1130                         reg |= DWC3_GRXTHRCFG_RXPKTCNT(rx_thr_num);
1131
1132                         reg &= ~DWC3_GRXTHRCFG_MAXRXBURSTSIZE(~0);
1133                         reg |= DWC3_GRXTHRCFG_MAXRXBURSTSIZE(rx_maxburst);
1134
1135                         dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
1136                 }
1137
1138                 if (tx_thr_num && tx_maxburst) {
1139                         reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG);
1140                         reg |= DWC3_GTXTHRCFG_PKTCNTSEL;
1141
1142                         reg &= ~DWC3_GTXTHRCFG_TXPKTCNT(~0);
1143                         reg |= DWC3_GTXTHRCFG_TXPKTCNT(tx_thr_num);
1144
1145                         reg &= ~DWC3_GTXTHRCFG_MAXTXBURSTSIZE(~0);
1146                         reg |= DWC3_GTXTHRCFG_MAXTXBURSTSIZE(tx_maxburst);
1147
1148                         dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg);
1149                 }
1150         } else {
1151                 if (rx_thr_num && rx_maxburst) {
1152                         reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
1153                         reg |= DWC31_GRXTHRCFG_PKTCNTSEL;
1154
1155                         reg &= ~DWC31_GRXTHRCFG_RXPKTCNT(~0);
1156                         reg |= DWC31_GRXTHRCFG_RXPKTCNT(rx_thr_num);
1157
1158                         reg &= ~DWC31_GRXTHRCFG_MAXRXBURSTSIZE(~0);
1159                         reg |= DWC31_GRXTHRCFG_MAXRXBURSTSIZE(rx_maxburst);
1160
1161                         dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
1162                 }
1163
1164                 if (tx_thr_num && tx_maxburst) {
1165                         reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG);
1166                         reg |= DWC31_GTXTHRCFG_PKTCNTSEL;
1167
1168                         reg &= ~DWC31_GTXTHRCFG_TXPKTCNT(~0);
1169                         reg |= DWC31_GTXTHRCFG_TXPKTCNT(tx_thr_num);
1170
1171                         reg &= ~DWC31_GTXTHRCFG_MAXTXBURSTSIZE(~0);
1172                         reg |= DWC31_GTXTHRCFG_MAXTXBURSTSIZE(tx_maxburst);
1173
1174                         dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg);
1175                 }
1176         }
1177 }
1178
1179 /**
1180  * dwc3_core_init - Low-level initialization of DWC3 Core
1181  * @dwc: Pointer to our controller context structure
1182  *
1183  * Returns 0 on success otherwise negative errno.
1184  */
1185 static int dwc3_core_init(struct dwc3 *dwc)
1186 {
1187         unsigned int            hw_mode;
1188         u32                     reg;
1189         int                     ret;
1190
1191         hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
1192
1193         /*
1194          * Write Linux Version Code to our GUID register so it's easy to figure
1195          * out which kernel version a bug was found.
1196          */
1197         dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);
1198
1199         ret = dwc3_phy_setup(dwc);
1200         if (ret)
1201                 return ret;
1202
1203         if (!dwc->ulpi_ready) {
1204                 ret = dwc3_core_ulpi_init(dwc);
1205                 if (ret) {
1206                         if (ret == -ETIMEDOUT) {
1207                                 dwc3_core_soft_reset(dwc);
1208                                 ret = -EPROBE_DEFER;
1209                         }
1210                         return ret;
1211                 }
1212                 dwc->ulpi_ready = true;
1213         }
1214
1215         if (!dwc->phys_ready) {
1216                 ret = dwc3_core_get_phy(dwc);
1217                 if (ret)
1218                         goto err_exit_ulpi;
1219                 dwc->phys_ready = true;
1220         }
1221
1222         ret = dwc3_phy_init(dwc);
1223         if (ret)
1224                 goto err_exit_ulpi;
1225
1226         ret = dwc3_core_soft_reset(dwc);
1227         if (ret)
1228                 goto err_exit_phy;
1229
1230         if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD &&
1231             !DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) {
1232                 if (!dwc->dis_u3_susphy_quirk) {
1233                         reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
1234                         reg |= DWC3_GUSB3PIPECTL_SUSPHY;
1235                         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
1236                 }
1237
1238                 if (!dwc->dis_u2_susphy_quirk) {
1239                         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
1240                         reg |= DWC3_GUSB2PHYCFG_SUSPHY;
1241                         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
1242                 }
1243         }
1244
1245         dwc3_core_setup_global_control(dwc);
1246         dwc3_core_num_eps(dwc);
1247
1248         /* Set power down scale of suspend_clk */
1249         dwc3_set_power_down_clk_scale(dwc);
1250
1251         /* Adjust Frame Length */
1252         dwc3_frame_length_adjustment(dwc);
1253
1254         /* Adjust Reference Clock Period */
1255         dwc3_ref_clk_period(dwc);
1256
1257         dwc3_set_incr_burst_type(dwc);
1258
1259         ret = dwc3_phy_power_on(dwc);
1260         if (ret)
1261                 goto err_exit_phy;
1262
1263         ret = dwc3_event_buffers_setup(dwc);
1264         if (ret) {
1265                 dev_err(dwc->dev, "failed to setup event buffers\n");
1266                 goto err_power_off_phy;
1267         }
1268
1269         /*
1270          * ENDXFER polling is available on version 3.10a and later of
1271          * the DWC_usb3 controller. It is NOT available in the
1272          * DWC_usb31 controller.
1273          */
1274         if (DWC3_VER_IS_WITHIN(DWC3, 310A, ANY)) {
1275                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL2);
1276                 reg |= DWC3_GUCTL2_RST_ACTBITLATER;
1277                 dwc3_writel(dwc->regs, DWC3_GUCTL2, reg);
1278         }
1279
1280         /*
1281          * When configured in HOST mode, after issuing U3/L2 exit controller
1282          * fails to send proper CRC checksum in CRC5 feild. Because of this
1283          * behaviour Transaction Error is generated, resulting in reset and
1284          * re-enumeration of usb device attached. All the termsel, xcvrsel,
1285          * opmode becomes 0 during end of resume. Enabling bit 10 of GUCTL1
1286          * will correct this problem. This option is to support certain
1287          * legacy ULPI PHYs.
1288          */
1289         if (dwc->resume_hs_terminations) {
1290                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);
1291                 reg |= DWC3_GUCTL1_RESUME_OPMODE_HS_HOST;
1292                 dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
1293         }
1294
1295         if (!DWC3_VER_IS_PRIOR(DWC3, 250A)) {
1296                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);
1297
1298                 /*
1299                  * Enable hardware control of sending remote wakeup
1300                  * in HS when the device is in the L1 state.
1301                  */
1302                 if (!DWC3_VER_IS_PRIOR(DWC3, 290A))
1303                         reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW;
1304
1305                 /*
1306                  * Decouple USB 2.0 L1 & L2 events which will allow for
1307                  * gadget driver to only receive U3/L2 suspend & wakeup
1308                  * events and prevent the more frequent L1 LPM transitions
1309                  * from interrupting the driver.
1310                  */
1311                 if (!DWC3_VER_IS_PRIOR(DWC3, 300A))
1312                         reg |= DWC3_GUCTL1_DEV_DECOUPLE_L1L2_EVT;
1313
1314                 if (dwc->dis_tx_ipgap_linecheck_quirk)
1315                         reg |= DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS;
1316
1317                 if (dwc->parkmode_disable_ss_quirk)
1318                         reg |= DWC3_GUCTL1_PARKMODE_DISABLE_SS;
1319
1320                 if (dwc->parkmode_disable_hs_quirk)
1321                         reg |= DWC3_GUCTL1_PARKMODE_DISABLE_HS;
1322
1323                 if (DWC3_VER_IS_WITHIN(DWC3, 290A, ANY) &&
1324                     (dwc->maximum_speed == USB_SPEED_HIGH ||
1325                      dwc->maximum_speed == USB_SPEED_FULL))
1326                         reg |= DWC3_GUCTL1_DEV_FORCE_20_CLK_FOR_30_CLK;
1327
1328                 dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
1329         }
1330
1331         dwc3_config_threshold(dwc);
1332
1333         return 0;
1334
1335 err_power_off_phy:
1336         dwc3_phy_power_off(dwc);
1337 err_exit_phy:
1338         dwc3_phy_exit(dwc);
1339 err_exit_ulpi:
1340         dwc3_ulpi_exit(dwc);
1341
1342         return ret;
1343 }
1344
1345 static int dwc3_core_get_phy(struct dwc3 *dwc)
1346 {
1347         struct device           *dev = dwc->dev;
1348         struct device_node      *node = dev->of_node;
1349         int ret;
1350
1351         if (node) {
1352                 dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
1353                 dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
1354         } else {
1355                 dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
1356                 dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
1357         }
1358
1359         if (IS_ERR(dwc->usb2_phy)) {
1360                 ret = PTR_ERR(dwc->usb2_phy);
1361                 if (ret == -ENXIO || ret == -ENODEV)
1362                         dwc->usb2_phy = NULL;
1363                 else
1364                         return dev_err_probe(dev, ret, "no usb2 phy configured\n");
1365         }
1366
1367         if (IS_ERR(dwc->usb3_phy)) {
1368                 ret = PTR_ERR(dwc->usb3_phy);
1369                 if (ret == -ENXIO || ret == -ENODEV)
1370                         dwc->usb3_phy = NULL;
1371                 else
1372                         return dev_err_probe(dev, ret, "no usb3 phy configured\n");
1373         }
1374
1375         dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
1376         if (IS_ERR(dwc->usb2_generic_phy)) {
1377                 ret = PTR_ERR(dwc->usb2_generic_phy);
1378                 if (ret == -ENOSYS || ret == -ENODEV)
1379                         dwc->usb2_generic_phy = NULL;
1380                 else
1381                         return dev_err_probe(dev, ret, "no usb2 phy configured\n");
1382         }
1383
1384         dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
1385         if (IS_ERR(dwc->usb3_generic_phy)) {
1386                 ret = PTR_ERR(dwc->usb3_generic_phy);
1387                 if (ret == -ENOSYS || ret == -ENODEV)
1388                         dwc->usb3_generic_phy = NULL;
1389                 else
1390                         return dev_err_probe(dev, ret, "no usb3 phy configured\n");
1391         }
1392
1393         return 0;
1394 }
1395
1396 static int dwc3_core_init_mode(struct dwc3 *dwc)
1397 {
1398         struct device *dev = dwc->dev;
1399         int ret;
1400
1401         switch (dwc->dr_mode) {
1402         case USB_DR_MODE_PERIPHERAL:
1403                 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
1404
1405                 if (dwc->usb2_phy)
1406                         otg_set_vbus(dwc->usb2_phy->otg, false);
1407                 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
1408                 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
1409
1410                 ret = dwc3_gadget_init(dwc);
1411                 if (ret)
1412                         return dev_err_probe(dev, ret, "failed to initialize gadget\n");
1413                 break;
1414         case USB_DR_MODE_HOST:
1415                 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
1416
1417                 if (dwc->usb2_phy)
1418                         otg_set_vbus(dwc->usb2_phy->otg, true);
1419                 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
1420                 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
1421
1422                 ret = dwc3_host_init(dwc);
1423                 if (ret)
1424                         return dev_err_probe(dev, ret, "failed to initialize host\n");
1425                 break;
1426         case USB_DR_MODE_OTG:
1427                 INIT_WORK(&dwc->drd_work, __dwc3_set_mode);
1428                 ret = dwc3_drd_init(dwc);
1429                 if (ret)
1430                         return dev_err_probe(dev, ret, "failed to initialize dual-role\n");
1431                 break;
1432         default:
1433                 dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode);
1434                 return -EINVAL;
1435         }
1436
1437         return 0;
1438 }
1439
1440 static void dwc3_core_exit_mode(struct dwc3 *dwc)
1441 {
1442         switch (dwc->dr_mode) {
1443         case USB_DR_MODE_PERIPHERAL:
1444                 dwc3_gadget_exit(dwc);
1445                 break;
1446         case USB_DR_MODE_HOST:
1447                 dwc3_host_exit(dwc);
1448                 break;
1449         case USB_DR_MODE_OTG:
1450                 dwc3_drd_exit(dwc);
1451                 break;
1452         default:
1453                 /* do nothing */
1454                 break;
1455         }
1456
1457         /* de-assert DRVVBUS for HOST and OTG mode */
1458         dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
1459 }
1460
1461 static void dwc3_get_properties(struct dwc3 *dwc)
1462 {
1463         struct device           *dev = dwc->dev;
1464         u8                      lpm_nyet_threshold;
1465         u8                      tx_de_emphasis;
1466         u8                      hird_threshold;
1467         u8                      rx_thr_num_pkt = 0;
1468         u8                      rx_max_burst = 0;
1469         u8                      tx_thr_num_pkt = 0;
1470         u8                      tx_max_burst = 0;
1471         u8                      rx_thr_num_pkt_prd = 0;
1472         u8                      rx_max_burst_prd = 0;
1473         u8                      tx_thr_num_pkt_prd = 0;
1474         u8                      tx_max_burst_prd = 0;
1475         u8                      tx_fifo_resize_max_num;
1476         const char              *usb_psy_name;
1477         int                     ret;
1478
1479         /* default to highest possible threshold */
1480         lpm_nyet_threshold = 0xf;
1481
1482         /* default to -3.5dB de-emphasis */
1483         tx_de_emphasis = 1;
1484
1485         /*
1486          * default to assert utmi_sleep_n and use maximum allowed HIRD
1487          * threshold value of 0b1100
1488          */
1489         hird_threshold = 12;
1490
1491         /*
1492          * default to a TXFIFO size large enough to fit 6 max packets.  This
1493          * allows for systems with larger bus latencies to have some headroom
1494          * for endpoints that have a large bMaxBurst value.
1495          */
1496         tx_fifo_resize_max_num = 6;
1497
1498         dwc->maximum_speed = usb_get_maximum_speed(dev);
1499         dwc->max_ssp_rate = usb_get_maximum_ssp_rate(dev);
1500         dwc->dr_mode = usb_get_dr_mode(dev);
1501         dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node);
1502
1503         dwc->sysdev_is_parent = device_property_read_bool(dev,
1504                                 "linux,sysdev_is_parent");
1505         if (dwc->sysdev_is_parent)
1506                 dwc->sysdev = dwc->dev->parent;
1507         else
1508                 dwc->sysdev = dwc->dev;
1509
1510         ret = device_property_read_string(dev, "usb-psy-name", &usb_psy_name);
1511         if (ret >= 0) {
1512                 dwc->usb_psy = power_supply_get_by_name(usb_psy_name);
1513                 if (!dwc->usb_psy)
1514                         dev_err(dev, "couldn't get usb power supply\n");
1515         }
1516
1517         dwc->has_lpm_erratum = device_property_read_bool(dev,
1518                                 "snps,has-lpm-erratum");
1519         device_property_read_u8(dev, "snps,lpm-nyet-threshold",
1520                                 &lpm_nyet_threshold);
1521         dwc->is_utmi_l1_suspend = device_property_read_bool(dev,
1522                                 "snps,is-utmi-l1-suspend");
1523         device_property_read_u8(dev, "snps,hird-threshold",
1524                                 &hird_threshold);
1525         dwc->dis_start_transfer_quirk = device_property_read_bool(dev,
1526                                 "snps,dis-start-transfer-quirk");
1527         dwc->usb3_lpm_capable = device_property_read_bool(dev,
1528                                 "snps,usb3_lpm_capable");
1529         dwc->usb2_lpm_disable = device_property_read_bool(dev,
1530                                 "snps,usb2-lpm-disable");
1531         dwc->usb2_gadget_lpm_disable = device_property_read_bool(dev,
1532                                 "snps,usb2-gadget-lpm-disable");
1533         device_property_read_u8(dev, "snps,rx-thr-num-pkt",
1534                                 &rx_thr_num_pkt);
1535         device_property_read_u8(dev, "snps,rx-max-burst",
1536                                 &rx_max_burst);
1537         device_property_read_u8(dev, "snps,tx-thr-num-pkt",
1538                                 &tx_thr_num_pkt);
1539         device_property_read_u8(dev, "snps,tx-max-burst",
1540                                 &tx_max_burst);
1541         device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
1542                                 &rx_thr_num_pkt_prd);
1543         device_property_read_u8(dev, "snps,rx-max-burst-prd",
1544                                 &rx_max_burst_prd);
1545         device_property_read_u8(dev, "snps,tx-thr-num-pkt-prd",
1546                                 &tx_thr_num_pkt_prd);
1547         device_property_read_u8(dev, "snps,tx-max-burst-prd",
1548                                 &tx_max_burst_prd);
1549         dwc->do_fifo_resize = device_property_read_bool(dev,
1550                                                         "tx-fifo-resize");
1551         if (dwc->do_fifo_resize)
1552                 device_property_read_u8(dev, "tx-fifo-max-num",
1553                                         &tx_fifo_resize_max_num);
1554
1555         dwc->disable_scramble_quirk = device_property_read_bool(dev,
1556                                 "snps,disable_scramble_quirk");
1557         dwc->u2exit_lfps_quirk = device_property_read_bool(dev,
1558                                 "snps,u2exit_lfps_quirk");
1559         dwc->u2ss_inp3_quirk = device_property_read_bool(dev,
1560                                 "snps,u2ss_inp3_quirk");
1561         dwc->req_p1p2p3_quirk = device_property_read_bool(dev,
1562                                 "snps,req_p1p2p3_quirk");
1563         dwc->del_p1p2p3_quirk = device_property_read_bool(dev,
1564                                 "snps,del_p1p2p3_quirk");
1565         dwc->del_phy_power_chg_quirk = device_property_read_bool(dev,
1566                                 "snps,del_phy_power_chg_quirk");
1567         dwc->lfps_filter_quirk = device_property_read_bool(dev,
1568                                 "snps,lfps_filter_quirk");
1569         dwc->rx_detect_poll_quirk = device_property_read_bool(dev,
1570                                 "snps,rx_detect_poll_quirk");
1571         dwc->dis_u3_susphy_quirk = device_property_read_bool(dev,
1572                                 "snps,dis_u3_susphy_quirk");
1573         dwc->dis_u2_susphy_quirk = device_property_read_bool(dev,
1574                                 "snps,dis_u2_susphy_quirk");
1575         dwc->dis_enblslpm_quirk = device_property_read_bool(dev,
1576                                 "snps,dis_enblslpm_quirk");
1577         dwc->dis_u1_entry_quirk = device_property_read_bool(dev,
1578                                 "snps,dis-u1-entry-quirk");
1579         dwc->dis_u2_entry_quirk = device_property_read_bool(dev,
1580                                 "snps,dis-u2-entry-quirk");
1581         dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev,
1582                                 "snps,dis_rxdet_inp3_quirk");
1583         dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev,
1584                                 "snps,dis-u2-freeclk-exists-quirk");
1585         dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev,
1586                                 "snps,dis-del-phy-power-chg-quirk");
1587         dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev,
1588                                 "snps,dis-tx-ipgap-linecheck-quirk");
1589         dwc->resume_hs_terminations = device_property_read_bool(dev,
1590                                 "snps,resume-hs-terminations");
1591         dwc->ulpi_ext_vbus_drv = device_property_read_bool(dev,
1592                                 "snps,ulpi-ext-vbus-drv");
1593         dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev,
1594                                 "snps,parkmode-disable-ss-quirk");
1595         dwc->parkmode_disable_hs_quirk = device_property_read_bool(dev,
1596                                 "snps,parkmode-disable-hs-quirk");
1597         dwc->gfladj_refclk_lpm_sel = device_property_read_bool(dev,
1598                                 "snps,gfladj-refclk-lpm-sel-quirk");
1599
1600         dwc->tx_de_emphasis_quirk = device_property_read_bool(dev,
1601                                 "snps,tx_de_emphasis_quirk");
1602         device_property_read_u8(dev, "snps,tx_de_emphasis",
1603                                 &tx_de_emphasis);
1604         device_property_read_string(dev, "snps,hsphy_interface",
1605                                     &dwc->hsphy_interface);
1606         device_property_read_u32(dev, "snps,quirk-frame-length-adjustment",
1607                                  &dwc->fladj);
1608         device_property_read_u32(dev, "snps,ref-clock-period-ns",
1609                                  &dwc->ref_clk_per);
1610
1611         dwc->dis_metastability_quirk = device_property_read_bool(dev,
1612                                 "snps,dis_metastability_quirk");
1613
1614         dwc->dis_split_quirk = device_property_read_bool(dev,
1615                                 "snps,dis-split-quirk");
1616
1617         dwc->lpm_nyet_threshold = lpm_nyet_threshold;
1618         dwc->tx_de_emphasis = tx_de_emphasis;
1619
1620         dwc->hird_threshold = hird_threshold;
1621
1622         dwc->rx_thr_num_pkt = rx_thr_num_pkt;
1623         dwc->rx_max_burst = rx_max_burst;
1624
1625         dwc->tx_thr_num_pkt = tx_thr_num_pkt;
1626         dwc->tx_max_burst = tx_max_burst;
1627
1628         dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd;
1629         dwc->rx_max_burst_prd = rx_max_burst_prd;
1630
1631         dwc->tx_thr_num_pkt_prd = tx_thr_num_pkt_prd;
1632         dwc->tx_max_burst_prd = tx_max_burst_prd;
1633
1634         dwc->imod_interval = 0;
1635
1636         dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num;
1637 }
1638
1639 /* check whether the core supports IMOD */
1640 bool dwc3_has_imod(struct dwc3 *dwc)
1641 {
1642         return DWC3_VER_IS_WITHIN(DWC3, 300A, ANY) ||
1643                 DWC3_VER_IS_WITHIN(DWC31, 120A, ANY) ||
1644                 DWC3_IP_IS(DWC32);
1645 }
1646
1647 static void dwc3_check_params(struct dwc3 *dwc)
1648 {
1649         struct device *dev = dwc->dev;
1650         unsigned int hwparam_gen =
1651                 DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3);
1652
1653         /* Check for proper value of imod_interval */
1654         if (dwc->imod_interval && !dwc3_has_imod(dwc)) {
1655                 dev_warn(dwc->dev, "Interrupt moderation not supported\n");
1656                 dwc->imod_interval = 0;
1657         }
1658
1659         /*
1660          * Workaround for STAR 9000961433 which affects only version
1661          * 3.00a of the DWC_usb3 core. This prevents the controller
1662          * interrupt from being masked while handling events. IMOD
1663          * allows us to work around this issue. Enable it for the
1664          * affected version.
1665          */
1666         if (!dwc->imod_interval &&
1667             DWC3_VER_IS(DWC3, 300A))
1668                 dwc->imod_interval = 1;
1669
1670         /* Check the maximum_speed parameter */
1671         switch (dwc->maximum_speed) {
1672         case USB_SPEED_FULL:
1673         case USB_SPEED_HIGH:
1674                 break;
1675         case USB_SPEED_SUPER:
1676                 if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS)
1677                         dev_warn(dev, "UDC doesn't support Gen 1\n");
1678                 break;
1679         case USB_SPEED_SUPER_PLUS:
1680                 if ((DWC3_IP_IS(DWC32) &&
1681                      hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS) ||
1682                     (!DWC3_IP_IS(DWC32) &&
1683                      hwparam_gen != DWC3_GHWPARAMS3_SSPHY_IFC_GEN2))
1684                         dev_warn(dev, "UDC doesn't support SSP\n");
1685                 break;
1686         default:
1687                 dev_err(dev, "invalid maximum_speed parameter %d\n",
1688                         dwc->maximum_speed);
1689                 fallthrough;
1690         case USB_SPEED_UNKNOWN:
1691                 switch (hwparam_gen) {
1692                 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2:
1693                         dwc->maximum_speed = USB_SPEED_SUPER_PLUS;
1694                         break;
1695                 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1:
1696                         if (DWC3_IP_IS(DWC32))
1697                                 dwc->maximum_speed = USB_SPEED_SUPER_PLUS;
1698                         else
1699                                 dwc->maximum_speed = USB_SPEED_SUPER;
1700                         break;
1701                 case DWC3_GHWPARAMS3_SSPHY_IFC_DIS:
1702                         dwc->maximum_speed = USB_SPEED_HIGH;
1703                         break;
1704                 default:
1705                         dwc->maximum_speed = USB_SPEED_SUPER;
1706                         break;
1707                 }
1708                 break;
1709         }
1710
1711         /*
1712          * Currently the controller does not have visibility into the HW
1713          * parameter to determine the maximum number of lanes the HW supports.
1714          * If the number of lanes is not specified in the device property, then
1715          * set the default to support dual-lane for DWC_usb32 and single-lane
1716          * for DWC_usb31 for super-speed-plus.
1717          */
1718         if (dwc->maximum_speed == USB_SPEED_SUPER_PLUS) {
1719                 switch (dwc->max_ssp_rate) {
1720                 case USB_SSP_GEN_2x1:
1721                         if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_GEN1)
1722                                 dev_warn(dev, "UDC only supports Gen 1\n");
1723                         break;
1724                 case USB_SSP_GEN_1x2:
1725                 case USB_SSP_GEN_2x2:
1726                         if (DWC3_IP_IS(DWC31))
1727                                 dev_warn(dev, "UDC only supports single lane\n");
1728                         break;
1729                 case USB_SSP_GEN_UNKNOWN:
1730                 default:
1731                         switch (hwparam_gen) {
1732                         case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2:
1733                                 if (DWC3_IP_IS(DWC32))
1734                                         dwc->max_ssp_rate = USB_SSP_GEN_2x2;
1735                                 else
1736                                         dwc->max_ssp_rate = USB_SSP_GEN_2x1;
1737                                 break;
1738                         case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1:
1739                                 if (DWC3_IP_IS(DWC32))
1740                                         dwc->max_ssp_rate = USB_SSP_GEN_1x2;
1741                                 break;
1742                         }
1743                         break;
1744                 }
1745         }
1746 }
1747
1748 static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
1749 {
1750         struct device *dev = dwc->dev;
1751         struct device_node *np_phy;
1752         struct extcon_dev *edev = NULL;
1753         const char *name;
1754
1755         if (device_property_read_bool(dev, "extcon"))
1756                 return extcon_get_edev_by_phandle(dev, 0);
1757
1758         /*
1759          * Device tree platforms should get extcon via phandle.
1760          * On ACPI platforms, we get the name from a device property.
1761          * This device property is for kernel internal use only and
1762          * is expected to be set by the glue code.
1763          */
1764         if (device_property_read_string(dev, "linux,extcon-name", &name) == 0)
1765                 return extcon_get_extcon_dev(name);
1766
1767         /*
1768          * Check explicitly if "usb-role-switch" is used since
1769          * extcon_find_edev_by_node() can not be used to check the absence of
1770          * an extcon device. In the absence of an device it will always return
1771          * EPROBE_DEFER.
1772          */
1773         if (IS_ENABLED(CONFIG_USB_ROLE_SWITCH) &&
1774             device_property_read_bool(dev, "usb-role-switch"))
1775                 return NULL;
1776
1777         /*
1778          * Try to get an extcon device from the USB PHY controller's "port"
1779          * node. Check if it has the "port" node first, to avoid printing the
1780          * error message from underlying code, as it's a valid case: extcon
1781          * device (and "port" node) may be missing in case of "usb-role-switch"
1782          * or OTG mode.
1783          */
1784         np_phy = of_parse_phandle(dev->of_node, "phys", 0);
1785         if (of_graph_is_present(np_phy)) {
1786                 struct device_node *np_conn;
1787
1788                 np_conn = of_graph_get_remote_node(np_phy, -1, -1);
1789                 if (np_conn)
1790                         edev = extcon_find_edev_by_node(np_conn);
1791                 of_node_put(np_conn);
1792         }
1793         of_node_put(np_phy);
1794
1795         return edev;
1796 }
1797
1798 static int dwc3_get_clocks(struct dwc3 *dwc)
1799 {
1800         struct device *dev = dwc->dev;
1801
1802         if (!dev->of_node)
1803                 return 0;
1804
1805         /*
1806          * Clocks are optional, but new DT platforms should support all clocks
1807          * as required by the DT-binding.
1808          * Some devices have different clock names in legacy device trees,
1809          * check for them to retain backwards compatibility.
1810          */
1811         dwc->bus_clk = devm_clk_get_optional(dev, "bus_early");
1812         if (IS_ERR(dwc->bus_clk)) {
1813                 return dev_err_probe(dev, PTR_ERR(dwc->bus_clk),
1814                                 "could not get bus clock\n");
1815         }
1816
1817         if (dwc->bus_clk == NULL) {
1818                 dwc->bus_clk = devm_clk_get_optional(dev, "bus_clk");
1819                 if (IS_ERR(dwc->bus_clk)) {
1820                         return dev_err_probe(dev, PTR_ERR(dwc->bus_clk),
1821                                         "could not get bus clock\n");
1822                 }
1823         }
1824
1825         dwc->ref_clk = devm_clk_get_optional(dev, "ref");
1826         if (IS_ERR(dwc->ref_clk)) {
1827                 return dev_err_probe(dev, PTR_ERR(dwc->ref_clk),
1828                                 "could not get ref clock\n");
1829         }
1830
1831         if (dwc->ref_clk == NULL) {
1832                 dwc->ref_clk = devm_clk_get_optional(dev, "ref_clk");
1833                 if (IS_ERR(dwc->ref_clk)) {
1834                         return dev_err_probe(dev, PTR_ERR(dwc->ref_clk),
1835                                         "could not get ref clock\n");
1836                 }
1837         }
1838
1839         dwc->susp_clk = devm_clk_get_optional(dev, "suspend");
1840         if (IS_ERR(dwc->susp_clk)) {
1841                 return dev_err_probe(dev, PTR_ERR(dwc->susp_clk),
1842                                 "could not get suspend clock\n");
1843         }
1844
1845         if (dwc->susp_clk == NULL) {
1846                 dwc->susp_clk = devm_clk_get_optional(dev, "suspend_clk");
1847                 if (IS_ERR(dwc->susp_clk)) {
1848                         return dev_err_probe(dev, PTR_ERR(dwc->susp_clk),
1849                                         "could not get suspend clock\n");
1850                 }
1851         }
1852
1853         /* specific to Rockchip RK3588 */
1854         dwc->utmi_clk = devm_clk_get_optional(dev, "utmi");
1855         if (IS_ERR(dwc->utmi_clk)) {
1856                 return dev_err_probe(dev, PTR_ERR(dwc->utmi_clk),
1857                                 "could not get utmi clock\n");
1858         }
1859
1860         /* specific to Rockchip RK3588 */
1861         dwc->pipe_clk = devm_clk_get_optional(dev, "pipe");
1862         if (IS_ERR(dwc->pipe_clk)) {
1863                 return dev_err_probe(dev, PTR_ERR(dwc->pipe_clk),
1864                                 "could not get pipe clock\n");
1865         }
1866
1867         return 0;
1868 }
1869
1870 static int dwc3_probe(struct platform_device *pdev)
1871 {
1872         struct device           *dev = &pdev->dev;
1873         struct resource         *res, dwc_res;
1874         void __iomem            *regs;
1875         struct dwc3             *dwc;
1876         int                     ret;
1877
1878         dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
1879         if (!dwc)
1880                 return -ENOMEM;
1881
1882         dwc->dev = dev;
1883
1884         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1885         if (!res) {
1886                 dev_err(dev, "missing memory resource\n");
1887                 return -ENODEV;
1888         }
1889
1890         dwc->xhci_resources[0].start = res->start;
1891         dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
1892                                         DWC3_XHCI_REGS_END;
1893         dwc->xhci_resources[0].flags = res->flags;
1894         dwc->xhci_resources[0].name = res->name;
1895
1896         /*
1897          * Request memory region but exclude xHCI regs,
1898          * since it will be requested by the xhci-plat driver.
1899          */
1900         dwc_res = *res;
1901         dwc_res.start += DWC3_GLOBALS_REGS_START;
1902
1903         if (dev->of_node) {
1904                 struct device_node *parent = of_get_parent(dev->of_node);
1905
1906                 if (of_device_is_compatible(parent, "realtek,rtd-dwc3")) {
1907                         dwc_res.start -= DWC3_GLOBALS_REGS_START;
1908                         dwc_res.start += DWC3_RTK_RTD_GLOBALS_REGS_START;
1909                 }
1910
1911                 of_node_put(parent);
1912         }
1913
1914         regs = devm_ioremap_resource(dev, &dwc_res);
1915         if (IS_ERR(regs))
1916                 return PTR_ERR(regs);
1917
1918         dwc->regs       = regs;
1919         dwc->regs_size  = resource_size(&dwc_res);
1920
1921         dwc3_get_properties(dwc);
1922
1923         dwc->reset = devm_reset_control_array_get_optional_shared(dev);
1924         if (IS_ERR(dwc->reset)) {
1925                 ret = PTR_ERR(dwc->reset);
1926                 goto err_put_psy;
1927         }
1928
1929         ret = dwc3_get_clocks(dwc);
1930         if (ret)
1931                 goto err_put_psy;
1932
1933         ret = reset_control_deassert(dwc->reset);
1934         if (ret)
1935                 goto err_put_psy;
1936
1937         ret = dwc3_clk_enable(dwc);
1938         if (ret)
1939                 goto err_assert_reset;
1940
1941         if (!dwc3_core_is_valid(dwc)) {
1942                 dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
1943                 ret = -ENODEV;
1944                 goto err_disable_clks;
1945         }
1946
1947         platform_set_drvdata(pdev, dwc);
1948         dwc3_cache_hwparams(dwc);
1949
1950         if (!dwc->sysdev_is_parent &&
1951             DWC3_GHWPARAMS0_AWIDTH(dwc->hwparams.hwparams0) == 64) {
1952                 ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64));
1953                 if (ret)
1954                         goto err_disable_clks;
1955         }
1956
1957         spin_lock_init(&dwc->lock);
1958         mutex_init(&dwc->mutex);
1959
1960         pm_runtime_get_noresume(dev);
1961         pm_runtime_set_active(dev);
1962         pm_runtime_use_autosuspend(dev);
1963         pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);
1964         pm_runtime_enable(dev);
1965
1966         pm_runtime_forbid(dev);
1967
1968         ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
1969         if (ret) {
1970                 dev_err(dwc->dev, "failed to allocate event buffers\n");
1971                 ret = -ENOMEM;
1972                 goto err_allow_rpm;
1973         }
1974
1975         dwc->edev = dwc3_get_extcon(dwc);
1976         if (IS_ERR(dwc->edev)) {
1977                 ret = dev_err_probe(dwc->dev, PTR_ERR(dwc->edev), "failed to get extcon\n");
1978                 goto err_free_event_buffers;
1979         }
1980
1981         ret = dwc3_get_dr_mode(dwc);
1982         if (ret)
1983                 goto err_free_event_buffers;
1984
1985         ret = dwc3_core_init(dwc);
1986         if (ret) {
1987                 dev_err_probe(dev, ret, "failed to initialize core\n");
1988                 goto err_free_event_buffers;
1989         }
1990
1991         dwc3_check_params(dwc);
1992         dwc3_debugfs_init(dwc);
1993
1994         ret = dwc3_core_init_mode(dwc);
1995         if (ret)
1996                 goto err_exit_debugfs;
1997
1998         pm_runtime_put(dev);
1999
2000         dma_set_max_seg_size(dev, UINT_MAX);
2001
2002         return 0;
2003
2004 err_exit_debugfs:
2005         dwc3_debugfs_exit(dwc);
2006         dwc3_event_buffers_cleanup(dwc);
2007         dwc3_phy_power_off(dwc);
2008         dwc3_phy_exit(dwc);
2009         dwc3_ulpi_exit(dwc);
2010 err_free_event_buffers:
2011         dwc3_free_event_buffers(dwc);
2012 err_allow_rpm:
2013         pm_runtime_allow(dev);
2014         pm_runtime_disable(dev);
2015         pm_runtime_dont_use_autosuspend(dev);
2016         pm_runtime_set_suspended(dev);
2017         pm_runtime_put_noidle(dev);
2018 err_disable_clks:
2019         dwc3_clk_disable(dwc);
2020 err_assert_reset:
2021         reset_control_assert(dwc->reset);
2022 err_put_psy:
2023         if (dwc->usb_psy)
2024                 power_supply_put(dwc->usb_psy);
2025
2026         return ret;
2027 }
2028
2029 static void dwc3_remove(struct platform_device *pdev)
2030 {
2031         struct dwc3     *dwc = platform_get_drvdata(pdev);
2032
2033         pm_runtime_get_sync(&pdev->dev);
2034
2035         dwc3_core_exit_mode(dwc);
2036         dwc3_debugfs_exit(dwc);
2037
2038         dwc3_core_exit(dwc);
2039         dwc3_ulpi_exit(dwc);
2040
2041         pm_runtime_allow(&pdev->dev);
2042         pm_runtime_disable(&pdev->dev);
2043         pm_runtime_dont_use_autosuspend(&pdev->dev);
2044         pm_runtime_put_noidle(&pdev->dev);
2045         /*
2046          * HACK: Clear the driver data, which is currently accessed by parent
2047          * glue drivers, before allowing the parent to suspend.
2048          */
2049         platform_set_drvdata(pdev, NULL);
2050         pm_runtime_set_suspended(&pdev->dev);
2051
2052         dwc3_free_event_buffers(dwc);
2053
2054         if (dwc->usb_psy)
2055                 power_supply_put(dwc->usb_psy);
2056 }
2057
2058 #ifdef CONFIG_PM
2059 static int dwc3_core_init_for_resume(struct dwc3 *dwc)
2060 {
2061         int ret;
2062
2063         ret = reset_control_deassert(dwc->reset);
2064         if (ret)
2065                 return ret;
2066
2067         ret = dwc3_clk_enable(dwc);
2068         if (ret)
2069                 goto assert_reset;
2070
2071         ret = dwc3_core_init(dwc);
2072         if (ret)
2073                 goto disable_clks;
2074
2075         return 0;
2076
2077 disable_clks:
2078         dwc3_clk_disable(dwc);
2079 assert_reset:
2080         reset_control_assert(dwc->reset);
2081
2082         return ret;
2083 }
2084
2085 static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
2086 {
2087         unsigned long   flags;
2088         u32 reg;
2089
2090         switch (dwc->current_dr_role) {
2091         case DWC3_GCTL_PRTCAP_DEVICE:
2092                 if (pm_runtime_suspended(dwc->dev))
2093                         break;
2094                 dwc3_gadget_suspend(dwc);
2095                 synchronize_irq(dwc->irq_gadget);
2096                 dwc3_core_exit(dwc);
2097                 break;
2098         case DWC3_GCTL_PRTCAP_HOST:
2099                 if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) {
2100                         dwc3_core_exit(dwc);
2101                         break;
2102                 }
2103
2104                 /* Let controller to suspend HSPHY before PHY driver suspends */
2105                 if (dwc->dis_u2_susphy_quirk ||
2106                     dwc->dis_enblslpm_quirk) {
2107                         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
2108                         reg |=  DWC3_GUSB2PHYCFG_ENBLSLPM |
2109                                 DWC3_GUSB2PHYCFG_SUSPHY;
2110                         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
2111
2112                         /* Give some time for USB2 PHY to suspend */
2113                         usleep_range(5000, 6000);
2114                 }
2115
2116                 phy_pm_runtime_put_sync(dwc->usb2_generic_phy);
2117                 phy_pm_runtime_put_sync(dwc->usb3_generic_phy);
2118                 break;
2119         case DWC3_GCTL_PRTCAP_OTG:
2120                 /* do nothing during runtime_suspend */
2121                 if (PMSG_IS_AUTO(msg))
2122                         break;
2123
2124                 if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
2125                         spin_lock_irqsave(&dwc->lock, flags);
2126                         dwc3_gadget_suspend(dwc);
2127                         spin_unlock_irqrestore(&dwc->lock, flags);
2128                         synchronize_irq(dwc->irq_gadget);
2129                 }
2130
2131                 dwc3_otg_exit(dwc);
2132                 dwc3_core_exit(dwc);
2133                 break;
2134         default:
2135                 /* do nothing */
2136                 break;
2137         }
2138
2139         return 0;
2140 }
2141
2142 static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
2143 {
2144         unsigned long   flags;
2145         int             ret;
2146         u32             reg;
2147
2148         switch (dwc->current_dr_role) {
2149         case DWC3_GCTL_PRTCAP_DEVICE:
2150                 ret = dwc3_core_init_for_resume(dwc);
2151                 if (ret)
2152                         return ret;
2153
2154                 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
2155                 dwc3_gadget_resume(dwc);
2156                 break;
2157         case DWC3_GCTL_PRTCAP_HOST:
2158                 if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) {
2159                         ret = dwc3_core_init_for_resume(dwc);
2160                         if (ret)
2161                                 return ret;
2162                         dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
2163                         break;
2164                 }
2165                 /* Restore GUSB2PHYCFG bits that were modified in suspend */
2166                 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
2167                 if (dwc->dis_u2_susphy_quirk)
2168                         reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
2169
2170                 if (dwc->dis_enblslpm_quirk)
2171                         reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
2172
2173                 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
2174
2175                 phy_pm_runtime_get_sync(dwc->usb2_generic_phy);
2176                 phy_pm_runtime_get_sync(dwc->usb3_generic_phy);
2177                 break;
2178         case DWC3_GCTL_PRTCAP_OTG:
2179                 /* nothing to do on runtime_resume */
2180                 if (PMSG_IS_AUTO(msg))
2181                         break;
2182
2183                 ret = dwc3_core_init_for_resume(dwc);
2184                 if (ret)
2185                         return ret;
2186
2187                 dwc3_set_prtcap(dwc, dwc->current_dr_role);
2188
2189                 dwc3_otg_init(dwc);
2190                 if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST) {
2191                         dwc3_otg_host_init(dwc);
2192                 } else if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
2193                         spin_lock_irqsave(&dwc->lock, flags);
2194                         dwc3_gadget_resume(dwc);
2195                         spin_unlock_irqrestore(&dwc->lock, flags);
2196                 }
2197
2198                 break;
2199         default:
2200                 /* do nothing */
2201                 break;
2202         }
2203
2204         return 0;
2205 }
2206
2207 static int dwc3_runtime_checks(struct dwc3 *dwc)
2208 {
2209         switch (dwc->current_dr_role) {
2210         case DWC3_GCTL_PRTCAP_DEVICE:
2211                 if (dwc->connected)
2212                         return -EBUSY;
2213                 break;
2214         case DWC3_GCTL_PRTCAP_HOST:
2215         default:
2216                 /* do nothing */
2217                 break;
2218         }
2219
2220         return 0;
2221 }
2222
2223 static int dwc3_runtime_suspend(struct device *dev)
2224 {
2225         struct dwc3     *dwc = dev_get_drvdata(dev);
2226         int             ret;
2227
2228         if (dwc3_runtime_checks(dwc))
2229                 return -EBUSY;
2230
2231         ret = dwc3_suspend_common(dwc, PMSG_AUTO_SUSPEND);
2232         if (ret)
2233                 return ret;
2234
2235         return 0;
2236 }
2237
2238 static int dwc3_runtime_resume(struct device *dev)
2239 {
2240         struct dwc3     *dwc = dev_get_drvdata(dev);
2241         int             ret;
2242
2243         ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME);
2244         if (ret)
2245                 return ret;
2246
2247         switch (dwc->current_dr_role) {
2248         case DWC3_GCTL_PRTCAP_DEVICE:
2249                 dwc3_gadget_process_pending_events(dwc);
2250                 break;
2251         case DWC3_GCTL_PRTCAP_HOST:
2252         default:
2253                 /* do nothing */
2254                 break;
2255         }
2256
2257         pm_runtime_mark_last_busy(dev);
2258
2259         return 0;
2260 }
2261
2262 static int dwc3_runtime_idle(struct device *dev)
2263 {
2264         struct dwc3     *dwc = dev_get_drvdata(dev);
2265
2266         switch (dwc->current_dr_role) {
2267         case DWC3_GCTL_PRTCAP_DEVICE:
2268                 if (dwc3_runtime_checks(dwc))
2269                         return -EBUSY;
2270                 break;
2271         case DWC3_GCTL_PRTCAP_HOST:
2272         default:
2273                 /* do nothing */
2274                 break;
2275         }
2276
2277         pm_runtime_mark_last_busy(dev);
2278         pm_runtime_autosuspend(dev);
2279
2280         return 0;
2281 }
2282 #endif /* CONFIG_PM */
2283
2284 #ifdef CONFIG_PM_SLEEP
2285 static int dwc3_suspend(struct device *dev)
2286 {
2287         struct dwc3     *dwc = dev_get_drvdata(dev);
2288         int             ret;
2289
2290         ret = dwc3_suspend_common(dwc, PMSG_SUSPEND);
2291         if (ret)
2292                 return ret;
2293
2294         pinctrl_pm_select_sleep_state(dev);
2295
2296         return 0;
2297 }
2298
2299 static int dwc3_resume(struct device *dev)
2300 {
2301         struct dwc3     *dwc = dev_get_drvdata(dev);
2302         int             ret;
2303
2304         pinctrl_pm_select_default_state(dev);
2305
2306         ret = dwc3_resume_common(dwc, PMSG_RESUME);
2307         if (ret)
2308                 return ret;
2309
2310         pm_runtime_disable(dev);
2311         pm_runtime_set_active(dev);
2312         pm_runtime_enable(dev);
2313
2314         return 0;
2315 }
2316
2317 static void dwc3_complete(struct device *dev)
2318 {
2319         struct dwc3     *dwc = dev_get_drvdata(dev);
2320         u32             reg;
2321
2322         if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST &&
2323                         dwc->dis_split_quirk) {
2324                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
2325                 reg |= DWC3_GUCTL3_SPLITDISABLE;
2326                 dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
2327         }
2328 }
2329 #else
2330 #define dwc3_complete NULL
2331 #endif /* CONFIG_PM_SLEEP */
2332
2333 static const struct dev_pm_ops dwc3_dev_pm_ops = {
2334         SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
2335         .complete = dwc3_complete,
2336         SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume,
2337                         dwc3_runtime_idle)
2338 };
2339
2340 #ifdef CONFIG_OF
2341 static const struct of_device_id of_dwc3_match[] = {
2342         {
2343                 .compatible = "snps,dwc3"
2344         },
2345         {
2346                 .compatible = "synopsys,dwc3"
2347         },
2348         { },
2349 };
2350 MODULE_DEVICE_TABLE(of, of_dwc3_match);
2351 #endif
2352
2353 #ifdef CONFIG_ACPI
2354
2355 #define ACPI_ID_INTEL_BSW       "808622B7"
2356
2357 static const struct acpi_device_id dwc3_acpi_match[] = {
2358         { ACPI_ID_INTEL_BSW, 0 },
2359         { },
2360 };
2361 MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match);
2362 #endif
2363
2364 static struct platform_driver dwc3_driver = {
2365         .probe          = dwc3_probe,
2366         .remove_new     = dwc3_remove,
2367         .driver         = {
2368                 .name   = "dwc3",
2369                 .of_match_table = of_match_ptr(of_dwc3_match),
2370                 .acpi_match_table = ACPI_PTR(dwc3_acpi_match),
2371                 .pm     = &dwc3_dev_pm_ops,
2372         },
2373 };
2374
2375 module_platform_driver(dwc3_driver);
2376
2377 MODULE_ALIAS("platform:dwc3");
2378 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
2379 MODULE_LICENSE("GPL v2");
2380 MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver");