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/acpi.h>
  27 #include <linux/pinctrl/consumer.h>
  28 #include <linux/reset.h>
  29
  30 #include <linux/usb/ch9.h>
  31 #include <linux/usb/gadget.h>
  32 #include <linux/usb/of.h>
  33 #include <linux/usb/otg.h>
  34
  35 #include "core.h"
  36 #include "gadget.h"
  37 #include "io.h"
  38
  39 #include "debug.h"
  40
  41 #define DWC3_DEFAULT_AUTOSUSPEND_DELAY  5000 /* ms */
  42
  43 /**
  44  * dwc3_get_dr_mode - Validates and sets dr_mode
  45  * @dwc: pointer to our context structure
  46  */
  47 static int dwc3_get_dr_mode(struct dwc3 *dwc)
  48 {
  49         enum usb_dr_mode mode;
  50         struct device *dev = dwc->dev;
  51         unsigned int hw_mode;
  52
  53         if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
  54                 dwc->dr_mode = USB_DR_MODE_OTG;
  55
  56         mode = dwc->dr_mode;
  57         hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
  58
  59         switch (hw_mode) {
  60         case DWC3_GHWPARAMS0_MODE_GADGET:
  61                 if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) {
  62                         dev_err(dev,
  63                                 "Controller does not support host mode.\n");
  64                         return -EINVAL;
  65                 }
  66                 mode = USB_DR_MODE_PERIPHERAL;
  67                 break;
  68         case DWC3_GHWPARAMS0_MODE_HOST:
  69                 if (IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
  70                         dev_err(dev,
  71                                 "Controller does not support device mode.\n");
  72                         return -EINVAL;
  73                 }
  74                 mode = USB_DR_MODE_HOST;
  75                 break;
  76         default:
  77                 if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
  78                         mode = USB_DR_MODE_HOST;
  79                 else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
  80                         mode = USB_DR_MODE_PERIPHERAL;
  81
  82                 /*
  83                  * DWC_usb31 and DWC_usb3 v3.30a and higher do not support OTG
  84                  * mode. If the controller supports DRD but the dr_mode is not
  85                  * specified or set to OTG, then set the mode to peripheral.
  86                  */
  87                 if (mode == USB_DR_MODE_OTG &&
  88                     (!IS_ENABLED(CONFIG_USB_ROLE_SWITCH) ||
  89                      !device_property_read_bool(dwc->dev, "usb-role-switch")) &&
  90                     !DWC3_VER_IS_PRIOR(DWC3, 330A))
  91                         mode = USB_DR_MODE_PERIPHERAL;
  92         }
  93
  94         if (mode != dwc->dr_mode) {
  95                 dev_warn(dev,
  96                          "Configuration mismatch. dr_mode forced to %s\n",
  97                          mode == USB_DR_MODE_HOST ? "host" : "gadget");
  98
  99                 dwc->dr_mode = mode;
 100         }
 101
 102         return 0;
 103 }
 104
 105 void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode)
 106 {
 107         u32 reg;
 108
 109         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 110         reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
 111         reg |= DWC3_GCTL_PRTCAPDIR(mode);
 112         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 113
 114         dwc->current_dr_role = mode;
 115 }
 116
 117 static void __dwc3_set_mode(struct work_struct *work)
 118 {
 119         struct dwc3 *dwc = work_to_dwc(work);
 120         unsigned long flags;
 121         int ret;
 122         u32 reg;
 123
 124         pm_runtime_get_sync(dwc->dev);
 125
 126         if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG)
 127                 dwc3_otg_update(dwc, 0);
 128
 129         if (!dwc->desired_dr_role)
 130                 goto out;
 131
 132         if (dwc->desired_dr_role == dwc->current_dr_role)
 133                 goto out;
 134
 135         if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev)
 136                 goto out;
 137
 138         switch (dwc->current_dr_role) {
 139         case DWC3_GCTL_PRTCAP_HOST:
 140                 dwc3_host_exit(dwc);
 141                 break;
 142         case DWC3_GCTL_PRTCAP_DEVICE:
 143                 dwc3_gadget_exit(dwc);
 144                 dwc3_event_buffers_cleanup(dwc);
 145                 break;
 146         case DWC3_GCTL_PRTCAP_OTG:
 147                 dwc3_otg_exit(dwc);
 148                 spin_lock_irqsave(&dwc->lock, flags);
 149                 dwc->desired_otg_role = DWC3_OTG_ROLE_IDLE;
 150                 spin_unlock_irqrestore(&dwc->lock, flags);
 151                 dwc3_otg_update(dwc, 1);
 152                 break;
 153         default:
 154                 break;
 155         }
 156
 157         spin_lock_irqsave(&dwc->lock, flags);
 158
 159         dwc3_set_prtcap(dwc, dwc->desired_dr_role);
 160
 161         spin_unlock_irqrestore(&dwc->lock, flags);
 162
 163         switch (dwc->desired_dr_role) {
 164         case DWC3_GCTL_PRTCAP_HOST:
 165                 ret = dwc3_host_init(dwc);
 166                 if (ret) {
 167                         dev_err(dwc->dev, "failed to initialize host\n");
 168                 } else {
 169                         if (dwc->usb2_phy)
 170                                 otg_set_vbus(dwc->usb2_phy->otg, true);
 171                         phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
 172                         phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
 173                         if (dwc->dis_split_quirk) {
 174                                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
 175                                 reg |= DWC3_GUCTL3_SPLITDISABLE;
 176                                 dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
 177                         }
 178                 }
 179                 break;
 180         case DWC3_GCTL_PRTCAP_DEVICE:
 181                 dwc3_event_buffers_setup(dwc);
 182
 183                 if (dwc->usb2_phy)
 184                         otg_set_vbus(dwc->usb2_phy->otg, false);
 185                 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
 186                 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
 187
 188                 ret = dwc3_gadget_init(dwc);
 189                 if (ret)
 190                         dev_err(dwc->dev, "failed to initialize peripheral\n");
 191                 break;
 192         case DWC3_GCTL_PRTCAP_OTG:
 193                 dwc3_otg_init(dwc);
 194                 dwc3_otg_update(dwc, 0);
 195                 break;
 196         default:
 197                 break;
 198         }
 199
 200 out:
 201         pm_runtime_mark_last_busy(dwc->dev);
 202         pm_runtime_put_autosuspend(dwc->dev);
 203 }
 204
 205 void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
 206 {
 207         unsigned long flags;
 208
 209         if (dwc->dr_mode != USB_DR_MODE_OTG)
 210                 return;
 211
 212         spin_lock_irqsave(&dwc->lock, flags);
 213         dwc->desired_dr_role = mode;
 214         spin_unlock_irqrestore(&dwc->lock, flags);
 215
 216         queue_work(system_freezable_wq, &dwc->drd_work);
 217 }
 218
 219 u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type)
 220 {
 221         struct dwc3             *dwc = dep->dwc;
 222         u32                     reg;
 223
 224         dwc3_writel(dwc->regs, DWC3_GDBGFIFOSPACE,
 225                         DWC3_GDBGFIFOSPACE_NUM(dep->number) |
 226                         DWC3_GDBGFIFOSPACE_TYPE(type));
 227
 228         reg = dwc3_readl(dwc->regs, DWC3_GDBGFIFOSPACE);
 229
 230         return DWC3_GDBGFIFOSPACE_SPACE_AVAILABLE(reg);
 231 }
 232
 233 /**
 234  * dwc3_core_soft_reset - Issues core soft reset and PHY reset
 235  * @dwc: pointer to our context structure
 236  */
 237 static int dwc3_core_soft_reset(struct dwc3 *dwc)
 238 {
 239         u32             reg;
 240         int             retries = 1000;
 241         int             ret;
 242
 243         usb_phy_init(dwc->usb2_phy);
 244         usb_phy_init(dwc->usb3_phy);
 245         ret = phy_init(dwc->usb2_generic_phy);
 246         if (ret < 0)
 247                 return ret;
 248
 249         ret = phy_init(dwc->usb3_generic_phy);
 250         if (ret < 0) {
 251                 phy_exit(dwc->usb2_generic_phy);
 252                 return ret;
 253         }
 254
 255         /*
 256          * We're resetting only the device side because, if we're in host mode,
 257          * XHCI driver will reset the host block. If dwc3 was configured for
 258          * host-only mode, then we can return early.
 259          */
 260         if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
 261                 return 0;
 262
 263         reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 264         reg |= DWC3_DCTL_CSFTRST;
 265         dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 266
 267         /*
 268          * For DWC_usb31 controller 1.90a and later, the DCTL.CSFRST bit
 269          * is cleared only after all the clocks are synchronized. This can
 270          * take a little more than 50ms. Set the polling rate at 20ms
 271          * for 10 times instead.
 272          */
 273         if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32))
 274                 retries = 10;
 275
 276         do {
 277                 reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 278                 if (!(reg & DWC3_DCTL_CSFTRST))
 279                         goto done;
 280
 281                 if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32))
 282                         msleep(20);
 283                 else
 284                         udelay(1);
 285         } while (--retries);
 286
 287         phy_exit(dwc->usb3_generic_phy);
 288         phy_exit(dwc->usb2_generic_phy);
 289
 290         return -ETIMEDOUT;
 291
 292 done:
 293         /*
 294          * For DWC_usb31 controller 1.80a and prior, once DCTL.CSFRST bit
 295          * is cleared, we must wait at least 50ms before accessing the PHY
 296          * domain (synchronization delay).
 297          */
 298         if (DWC3_VER_IS_WITHIN(DWC31, ANY, 180A))
 299                 msleep(50);
 300
 301         return 0;
 302 }
 303
 304 /*
 305  * dwc3_frame_length_adjustment - Adjusts frame length if required
 306  * @dwc3: Pointer to our controller context structure
 307  */
 308 static void dwc3_frame_length_adjustment(struct dwc3 *dwc)
 309 {
 310         u32 reg;
 311         u32 dft;
 312
 313         if (DWC3_VER_IS_PRIOR(DWC3, 250A))
 314                 return;
 315
 316         if (dwc->fladj == 0)
 317                 return;
 318
 319         reg = dwc3_readl(dwc->regs, DWC3_GFLADJ);
 320         dft = reg & DWC3_GFLADJ_30MHZ_MASK;
 321         if (dft != dwc->fladj) {
 322                 reg &= ~DWC3_GFLADJ_30MHZ_MASK;
 323                 reg |= DWC3_GFLADJ_30MHZ_SDBND_SEL | dwc->fladj;
 324                 dwc3_writel(dwc->regs, DWC3_GFLADJ, reg);
 325         }
 326 }
 327
 328 /**
 329  * dwc3_free_one_event_buffer - Frees one event buffer
 330  * @dwc: Pointer to our controller context structure
 331  * @evt: Pointer to event buffer to be freed
 332  */
 333 static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
 334                 struct dwc3_event_buffer *evt)
 335 {
 336         dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma);
 337 }
 338
 339 /**
 340  * dwc3_alloc_one_event_buffer - Allocates one event buffer structure
 341  * @dwc: Pointer to our controller context structure
 342  * @length: size of the event buffer
 343  *
 344  * Returns a pointer to the allocated event buffer structure on success
 345  * otherwise ERR_PTR(errno).
 346  */
 347 static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,
 348                 unsigned length)
 349 {
 350         struct dwc3_event_buffer        *evt;
 351
 352         evt = devm_kzalloc(dwc->dev, sizeof(*evt), GFP_KERNEL);
 353         if (!evt)
 354                 return ERR_PTR(-ENOMEM);
 355
 356         evt->dwc        = dwc;
 357         evt->length     = length;
 358         evt->cache      = devm_kzalloc(dwc->dev, length, GFP_KERNEL);
 359         if (!evt->cache)
 360                 return ERR_PTR(-ENOMEM);
 361
 362         evt->buf        = dma_alloc_coherent(dwc->sysdev, length,
 363                         &evt->dma, GFP_KERNEL);
 364         if (!evt->buf)
 365                 return ERR_PTR(-ENOMEM);
 366
 367         return evt;
 368 }
 369
 370 /**
 371  * dwc3_free_event_buffers - frees all allocated event buffers
 372  * @dwc: Pointer to our controller context structure
 373  */
 374 static void dwc3_free_event_buffers(struct dwc3 *dwc)
 375 {
 376         struct dwc3_event_buffer        *evt;
 377
 378         evt = dwc->ev_buf;
 379         if (evt)
 380                 dwc3_free_one_event_buffer(dwc, evt);
 381 }
 382
 383 /**
 384  * dwc3_alloc_event_buffers - Allocates @num event buffers of size @length
 385  * @dwc: pointer to our controller context structure
 386  * @length: size of event buffer
 387  *
 388  * Returns 0 on success otherwise negative errno. In the error case, dwc
 389  * may contain some buffers allocated but not all which were requested.
 390  */
 391 static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length)
 392 {
 393         struct dwc3_event_buffer *evt;
 394
 395         evt = dwc3_alloc_one_event_buffer(dwc, length);
 396         if (IS_ERR(evt)) {
 397                 dev_err(dwc->dev, "can't allocate event buffer\n");
 398                 return PTR_ERR(evt);
 399         }
 400         dwc->ev_buf = evt;
 401
 402         return 0;
 403 }
 404
 405 /**
 406  * dwc3_event_buffers_setup - setup our allocated event buffers
 407  * @dwc: pointer to our controller context structure
 408  *
 409  * Returns 0 on success otherwise negative errno.
 410  */
 411 int dwc3_event_buffers_setup(struct dwc3 *dwc)
 412 {
 413         struct dwc3_event_buffer        *evt;
 414
 415         evt = dwc->ev_buf;
 416         evt->lpos = 0;
 417         dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0),
 418                         lower_32_bits(evt->dma));
 419         dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0),
 420                         upper_32_bits(evt->dma));
 421         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
 422                         DWC3_GEVNTSIZ_SIZE(evt->length));
 423         dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
 424
 425         return 0;
 426 }
 427
 428 void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
 429 {
 430         struct dwc3_event_buffer        *evt;
 431
 432         evt = dwc->ev_buf;
 433
 434         evt->lpos = 0;
 435
 436         dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), 0);
 437         dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0), 0);
 438         dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), DWC3_GEVNTSIZ_INTMASK
 439                         | DWC3_GEVNTSIZ_SIZE(0));
 440         dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
 441 }
 442
 443 static int dwc3_alloc_scratch_buffers(struct dwc3 *dwc)
 444 {
 445         if (!dwc->has_hibernation)
 446                 return 0;
 447
 448         if (!dwc->nr_scratch)
 449                 return 0;
 450
 451         dwc->scratchbuf = kmalloc_array(dwc->nr_scratch,
 452                         DWC3_SCRATCHBUF_SIZE, GFP_KERNEL);
 453         if (!dwc->scratchbuf)
 454                 return -ENOMEM;
 455
 456         return 0;
 457 }
 458
 459 static int dwc3_setup_scratch_buffers(struct dwc3 *dwc)
 460 {
 461         dma_addr_t scratch_addr;
 462         u32 param;
 463         int ret;
 464
 465         if (!dwc->has_hibernation)
 466                 return 0;
 467
 468         if (!dwc->nr_scratch)
 469                 return 0;
 470
 471          /* should never fall here */
 472         if (!WARN_ON(dwc->scratchbuf))
 473                 return 0;
 474
 475         scratch_addr = dma_map_single(dwc->sysdev, dwc->scratchbuf,
 476                         dwc->nr_scratch * DWC3_SCRATCHBUF_SIZE,
 477                         DMA_BIDIRECTIONAL);
 478         if (dma_mapping_error(dwc->sysdev, scratch_addr)) {
 479                 dev_err(dwc->sysdev, "failed to map scratch buffer\n");
 480                 ret = -EFAULT;
 481                 goto err0;
 482         }
 483
 484         dwc->scratch_addr = scratch_addr;
 485
 486         param = lower_32_bits(scratch_addr);
 487
 488         ret = dwc3_send_gadget_generic_command(dwc,
 489                         DWC3_DGCMD_SET_SCRATCHPAD_ADDR_LO, param);
 490         if (ret < 0)
 491                 goto err1;
 492
 493         param = upper_32_bits(scratch_addr);
 494
 495         ret = dwc3_send_gadget_generic_command(dwc,
 496                         DWC3_DGCMD_SET_SCRATCHPAD_ADDR_HI, param);
 497         if (ret < 0)
 498                 goto err1;
 499
 500         return 0;
 501
 502 err1:
 503         dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
 504                         DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
 505
 506 err0:
 507         return ret;
 508 }
 509
 510 static void dwc3_free_scratch_buffers(struct dwc3 *dwc)
 511 {
 512         if (!dwc->has_hibernation)
 513                 return;
 514
 515         if (!dwc->nr_scratch)
 516                 return;
 517
 518          /* should never fall here */
 519         if (!WARN_ON(dwc->scratchbuf))
 520                 return;
 521
 522         dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
 523                         DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
 524         kfree(dwc->scratchbuf);
 525 }
 526
 527 static void dwc3_core_num_eps(struct dwc3 *dwc)
 528 {
 529         struct dwc3_hwparams    *parms = &dwc->hwparams;
 530
 531         dwc->num_eps = DWC3_NUM_EPS(parms);
 532 }
 533
 534 static void dwc3_cache_hwparams(struct dwc3 *dwc)
 535 {
 536         struct dwc3_hwparams    *parms = &dwc->hwparams;
 537
 538         parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0);
 539         parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1);
 540         parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2);
 541         parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3);
 542         parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4);
 543         parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5);
 544         parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6);
 545         parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7);
 546         parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
 547 }
 548
 549 static int dwc3_core_ulpi_init(struct dwc3 *dwc)
 550 {
 551         int intf;
 552         int ret = 0;
 553
 554         intf = DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3);
 555
 556         if (intf == DWC3_GHWPARAMS3_HSPHY_IFC_ULPI ||
 557             (intf == DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI &&
 558              dwc->hsphy_interface &&
 559              !strncmp(dwc->hsphy_interface, "ulpi", 4)))
 560                 ret = dwc3_ulpi_init(dwc);
 561
 562         return ret;
 563 }
 564
 565 /**
 566  * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core
 567  * @dwc: Pointer to our controller context structure
 568  *
 569  * Returns 0 on success. The USB PHY interfaces are configured but not
 570  * initialized. The PHY interfaces and the PHYs get initialized together with
 571  * the core in dwc3_core_init.
 572  */
 573 static int dwc3_phy_setup(struct dwc3 *dwc)
 574 {
 575         unsigned int hw_mode;
 576         u32 reg;
 577
 578         hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
 579
 580         reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
 581
 582         /*
 583          * Make sure UX_EXIT_PX is cleared as that causes issues with some
 584          * PHYs. Also, this bit is not supposed to be used in normal operation.
 585          */
 586         reg &= ~DWC3_GUSB3PIPECTL_UX_EXIT_PX;
 587
 588         /*
 589          * Above 1.94a, it is recommended to set DWC3_GUSB3PIPECTL_SUSPHY
 590          * to '0' during coreConsultant configuration. So default value
 591          * will be '0' when the core is reset. Application needs to set it
 592          * to '1' after the core initialization is completed.
 593          */
 594         if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A))
 595                 reg |= DWC3_GUSB3PIPECTL_SUSPHY;
 596
 597         /*
 598          * For DRD controllers, GUSB3PIPECTL.SUSPENDENABLE must be cleared after
 599          * power-on reset, and it can be set after core initialization, which is
 600          * after device soft-reset during initialization.
 601          */
 602         if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD)
 603                 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
 604
 605         if (dwc->u2ss_inp3_quirk)
 606                 reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK;
 607
 608         if (dwc->dis_rxdet_inp3_quirk)
 609                 reg |= DWC3_GUSB3PIPECTL_DISRXDETINP3;
 610
 611         if (dwc->req_p1p2p3_quirk)
 612                 reg |= DWC3_GUSB3PIPECTL_REQP1P2P3;
 613
 614         if (dwc->del_p1p2p3_quirk)
 615                 reg |= DWC3_GUSB3PIPECTL_DEP1P2P3_EN;
 616
 617         if (dwc->del_phy_power_chg_quirk)
 618                 reg |= DWC3_GUSB3PIPECTL_DEPOCHANGE;
 619
 620         if (dwc->lfps_filter_quirk)
 621                 reg |= DWC3_GUSB3PIPECTL_LFPSFILT;
 622
 623         if (dwc->rx_detect_poll_quirk)
 624                 reg |= DWC3_GUSB3PIPECTL_RX_DETOPOLL;
 625
 626         if (dwc->tx_de_emphasis_quirk)
 627                 reg |= DWC3_GUSB3PIPECTL_TX_DEEPH(dwc->tx_de_emphasis);
 628
 629         if (dwc->dis_u3_susphy_quirk)
 630                 reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
 631
 632         if (dwc->dis_del_phy_power_chg_quirk)
 633                 reg &= ~DWC3_GUSB3PIPECTL_DEPOCHANGE;
 634
 635         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 636
 637         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 638
 639         /* Select the HS PHY interface */
 640         switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) {
 641         case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI:
 642                 if (dwc->hsphy_interface &&
 643                                 !strncmp(dwc->hsphy_interface, "utmi", 4)) {
 644                         reg &= ~DWC3_GUSB2PHYCFG_ULPI_UTMI;
 645                         break;
 646                 } else if (dwc->hsphy_interface &&
 647                                 !strncmp(dwc->hsphy_interface, "ulpi", 4)) {
 648                         reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI;
 649                         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 650                 } else {
 651                         /* Relying on default value. */
 652                         if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI))
 653                                 break;
 654                 }
 655                 fallthrough;
 656         case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
 657         default:
 658                 break;
 659         }
 660
 661         switch (dwc->hsphy_mode) {
 662         case USBPHY_INTERFACE_MODE_UTMI:
 663                 reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
 664                        DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
 665                 reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_8_BIT) |
 666                        DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_8_BIT);
 667                 break;
 668         case USBPHY_INTERFACE_MODE_UTMIW:
 669                 reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
 670                        DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
 671                 reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_16_BIT) |
 672                        DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_16_BIT);
 673                 break;
 674         default:
 675                 break;
 676         }
 677
 678         /*
 679          * Above 1.94a, it is recommended to set DWC3_GUSB2PHYCFG_SUSPHY to
 680          * '0' during coreConsultant configuration. So default value will
 681          * be '0' when the core is reset. Application needs to set it to
 682          * '1' after the core initialization is completed.
 683          */
 684         if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A))
 685                 reg |= DWC3_GUSB2PHYCFG_SUSPHY;
 686
 687         /*
 688          * For DRD controllers, GUSB2PHYCFG.SUSPHY must be cleared after
 689          * power-on reset, and it can be set after core initialization, which is
 690          * after device soft-reset during initialization.
 691          */
 692         if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD)
 693                 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
 694
 695         if (dwc->dis_u2_susphy_quirk)
 696                 reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
 697
 698         if (dwc->dis_enblslpm_quirk)
 699                 reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
 700         else
 701                 reg |= DWC3_GUSB2PHYCFG_ENBLSLPM;
 702
 703         if (dwc->dis_u2_freeclk_exists_quirk)
 704                 reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
 705
 706         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 707
 708         return 0;
 709 }
 710
 711 static void dwc3_core_exit(struct dwc3 *dwc)
 712 {
 713         dwc3_event_buffers_cleanup(dwc);
 714
 715         usb_phy_shutdown(dwc->usb2_phy);
 716         usb_phy_shutdown(dwc->usb3_phy);
 717         phy_exit(dwc->usb2_generic_phy);
 718         phy_exit(dwc->usb3_generic_phy);
 719
 720         usb_phy_set_suspend(dwc->usb2_phy, 1);
 721         usb_phy_set_suspend(dwc->usb3_phy, 1);
 722         phy_power_off(dwc->usb2_generic_phy);
 723         phy_power_off(dwc->usb3_generic_phy);
 724         clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
 725         reset_control_assert(dwc->reset);
 726 }
 727
 728 static bool dwc3_core_is_valid(struct dwc3 *dwc)
 729 {
 730         u32 reg;
 731
 732         reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
 733         dwc->ip = DWC3_GSNPS_ID(reg);
 734
 735         /* This should read as U3 followed by revision number */
 736         if (DWC3_IP_IS(DWC3)) {
 737                 dwc->revision = reg;
 738         } else if (DWC3_IP_IS(DWC31) || DWC3_IP_IS(DWC32)) {
 739                 dwc->revision = dwc3_readl(dwc->regs, DWC3_VER_NUMBER);
 740                 dwc->version_type = dwc3_readl(dwc->regs, DWC3_VER_TYPE);
 741         } else {
 742                 return false;
 743         }
 744
 745         return true;
 746 }
 747
 748 static void dwc3_core_setup_global_control(struct dwc3 *dwc)
 749 {
 750         u32 hwparams4 = dwc->hwparams.hwparams4;
 751         u32 reg;
 752
 753         reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 754         reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
 755
 756         switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
 757         case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
 758                 /**
 759                  * WORKAROUND: DWC3 revisions between 2.10a and 2.50a have an
 760                  * issue which would cause xHCI compliance tests to fail.
 761                  *
 762                  * Because of that we cannot enable clock gating on such
 763                  * configurations.
 764                  *
 765                  * Refers to:
 766                  *
 767                  * STAR#9000588375: Clock Gating, SOF Issues when ref_clk-Based
 768                  * SOF/ITP Mode Used
 769                  */
 770                 if ((dwc->dr_mode == USB_DR_MODE_HOST ||
 771                                 dwc->dr_mode == USB_DR_MODE_OTG) &&
 772                                 DWC3_VER_IS_WITHIN(DWC3, 210A, 250A))
 773                         reg |= DWC3_GCTL_DSBLCLKGTNG | DWC3_GCTL_SOFITPSYNC;
 774                 else
 775                         reg &= ~DWC3_GCTL_DSBLCLKGTNG;
 776                 break;
 777         case DWC3_GHWPARAMS1_EN_PWROPT_HIB:
 778                 /* enable hibernation here */
 779                 dwc->nr_scratch = DWC3_GHWPARAMS4_HIBER_SCRATCHBUFS(hwparams4);
 780
 781                 /*
 782                  * REVISIT Enabling this bit so that host-mode hibernation
 783                  * will work. Device-mode hibernation is not yet implemented.
 784                  */
 785                 reg |= DWC3_GCTL_GBLHIBERNATIONEN;
 786                 break;
 787         default:
 788                 /* nothing */
 789                 break;
 790         }
 791
 792         /* check if current dwc3 is on simulation board */
 793         if (dwc->hwparams.hwparams6 & DWC3_GHWPARAMS6_EN_FPGA) {
 794                 dev_info(dwc->dev, "Running with FPGA optimizations\n");
 795                 dwc->is_fpga = true;
 796         }
 797
 798         WARN_ONCE(dwc->disable_scramble_quirk && !dwc->is_fpga,
 799                         "disable_scramble cannot be used on non-FPGA builds\n");
 800
 801         if (dwc->disable_scramble_quirk && dwc->is_fpga)
 802                 reg |= DWC3_GCTL_DISSCRAMBLE;
 803         else
 804                 reg &= ~DWC3_GCTL_DISSCRAMBLE;
 805
 806         if (dwc->u2exit_lfps_quirk)
 807                 reg |= DWC3_GCTL_U2EXIT_LFPS;
 808
 809         /*
 810          * WORKAROUND: DWC3 revisions <1.90a have a bug
 811          * where the device can fail to connect at SuperSpeed
 812          * and falls back to high-speed mode which causes
 813          * the device to enter a Connect/Disconnect loop
 814          */
 815         if (DWC3_VER_IS_PRIOR(DWC3, 190A))
 816                 reg |= DWC3_GCTL_U2RSTECN;
 817
 818         dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 819 }
 820
 821 static int dwc3_core_get_phy(struct dwc3 *dwc);
 822 static int dwc3_core_ulpi_init(struct dwc3 *dwc);
 823
 824 /* set global incr burst type configuration registers */
 825 static void dwc3_set_incr_burst_type(struct dwc3 *dwc)
 826 {
 827         struct device *dev = dwc->dev;
 828         /* incrx_mode : for INCR burst type. */
 829         bool incrx_mode;
 830         /* incrx_size : for size of INCRX burst. */
 831         u32 incrx_size;
 832         u32 *vals;
 833         u32 cfg;
 834         int ntype;
 835         int ret;
 836         int i;
 837
 838         cfg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0);
 839
 840         /*
 841          * Handle property "snps,incr-burst-type-adjustment".
 842          * Get the number of value from this property:
 843          * result <= 0, means this property is not supported.
 844          * result = 1, means INCRx burst mode supported.
 845          * result > 1, means undefined length burst mode supported.
 846          */
 847         ntype = device_property_count_u32(dev, "snps,incr-burst-type-adjustment");
 848         if (ntype <= 0)
 849                 return;
 850
 851         vals = kcalloc(ntype, sizeof(u32), GFP_KERNEL);
 852         if (!vals) {
 853                 dev_err(dev, "Error to get memory\n");
 854                 return;
 855         }
 856
 857         /* Get INCR burst type, and parse it */
 858         ret = device_property_read_u32_array(dev,
 859                         "snps,incr-burst-type-adjustment", vals, ntype);
 860         if (ret) {
 861                 kfree(vals);
 862                 dev_err(dev, "Error to get property\n");
 863                 return;
 864         }
 865
 866         incrx_size = *vals;
 867
 868         if (ntype > 1) {
 869                 /* INCRX (undefined length) burst mode */
 870                 incrx_mode = INCRX_UNDEF_LENGTH_BURST_MODE;
 871                 for (i = 1; i < ntype; i++) {
 872                         if (vals[i] > incrx_size)
 873                                 incrx_size = vals[i];
 874                 }
 875         } else {
 876                 /* INCRX burst mode */
 877                 incrx_mode = INCRX_BURST_MODE;
 878         }
 879
 880         kfree(vals);
 881
 882         /* Enable Undefined Length INCR Burst and Enable INCRx Burst */
 883         cfg &= ~DWC3_GSBUSCFG0_INCRBRST_MASK;
 884         if (incrx_mode)
 885                 cfg |= DWC3_GSBUSCFG0_INCRBRSTENA;
 886         switch (incrx_size) {
 887         case 256:
 888                 cfg |= DWC3_GSBUSCFG0_INCR256BRSTENA;
 889                 break;
 890         case 128:
 891                 cfg |= DWC3_GSBUSCFG0_INCR128BRSTENA;
 892                 break;
 893         case 64:
 894                 cfg |= DWC3_GSBUSCFG0_INCR64BRSTENA;
 895                 break;
 896         case 32:
 897                 cfg |= DWC3_GSBUSCFG0_INCR32BRSTENA;
 898                 break;
 899         case 16:
 900                 cfg |= DWC3_GSBUSCFG0_INCR16BRSTENA;
 901                 break;
 902         case 8:
 903                 cfg |= DWC3_GSBUSCFG0_INCR8BRSTENA;
 904                 break;
 905         case 4:
 906                 cfg |= DWC3_GSBUSCFG0_INCR4BRSTENA;
 907                 break;
 908         case 1:
 909                 break;
 910         default:
 911                 dev_err(dev, "Invalid property\n");
 912                 break;
 913         }
 914
 915         dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, cfg);
 916 }
 917
 918 /**
 919  * dwc3_core_init - Low-level initialization of DWC3 Core
 920  * @dwc: Pointer to our controller context structure
 921  *
 922  * Returns 0 on success otherwise negative errno.
 923  */
 924 static int dwc3_core_init(struct dwc3 *dwc)
 925 {
 926         unsigned int            hw_mode;
 927         u32                     reg;
 928         int                     ret;
 929
 930         hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
 931
 932         /*
 933          * Write Linux Version Code to our GUID register so it's easy to figure
 934          * out which kernel version a bug was found.
 935          */
 936         dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);
 937
 938         ret = dwc3_phy_setup(dwc);
 939         if (ret)
 940                 goto err0;
 941
 942         if (!dwc->ulpi_ready) {
 943                 ret = dwc3_core_ulpi_init(dwc);
 944                 if (ret)
 945                         goto err0;
 946                 dwc->ulpi_ready = true;
 947         }
 948
 949         if (!dwc->phys_ready) {
 950                 ret = dwc3_core_get_phy(dwc);
 951                 if (ret)
 952                         goto err0a;
 953                 dwc->phys_ready = true;
 954         }
 955
 956         ret = dwc3_core_soft_reset(dwc);
 957         if (ret)
 958                 goto err0a;
 959
 960         if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD &&
 961             !DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) {
 962                 if (!dwc->dis_u3_susphy_quirk) {
 963                         reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
 964                         reg |= DWC3_GUSB3PIPECTL_SUSPHY;
 965                         dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 966                 }
 967
 968                 if (!dwc->dis_u2_susphy_quirk) {
 969                         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 970                         reg |= DWC3_GUSB2PHYCFG_SUSPHY;
 971                         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 972                 }
 973         }
 974
 975         dwc3_core_setup_global_control(dwc);
 976         dwc3_core_num_eps(dwc);
 977
 978         ret = dwc3_setup_scratch_buffers(dwc);
 979         if (ret)
 980                 goto err1;
 981
 982         /* Adjust Frame Length */
 983         dwc3_frame_length_adjustment(dwc);
 984
 985         dwc3_set_incr_burst_type(dwc);
 986
 987         usb_phy_set_suspend(dwc->usb2_phy, 0);
 988         usb_phy_set_suspend(dwc->usb3_phy, 0);
 989         ret = phy_power_on(dwc->usb2_generic_phy);
 990         if (ret < 0)
 991                 goto err2;
 992
 993         ret = phy_power_on(dwc->usb3_generic_phy);
 994         if (ret < 0)
 995                 goto err3;
 996
 997         ret = dwc3_event_buffers_setup(dwc);
 998         if (ret) {
 999                 dev_err(dwc->dev, "failed to setup event buffers\n");
1000                 goto err4;
1001         }
1002
1003         /*
1004          * ENDXFER polling is available on version 3.10a and later of
1005          * the DWC_usb3 controller. It is NOT available in the
1006          * DWC_usb31 controller.
1007          */
1008         if (DWC3_VER_IS_WITHIN(DWC3, 310A, ANY)) {
1009                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL2);
1010                 reg |= DWC3_GUCTL2_RST_ACTBITLATER;
1011                 dwc3_writel(dwc->regs, DWC3_GUCTL2, reg);
1012         }
1013
1014         if (!DWC3_VER_IS_PRIOR(DWC3, 250A)) {
1015                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);
1016
1017                 /*
1018                  * Enable hardware control of sending remote wakeup
1019                  * in HS when the device is in the L1 state.
1020                  */
1021                 if (!DWC3_VER_IS_PRIOR(DWC3, 290A))
1022                         reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW;
1023
1024                 if (dwc->dis_tx_ipgap_linecheck_quirk)
1025                         reg |= DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS;
1026
1027                 if (dwc->parkmode_disable_ss_quirk)
1028                         reg |= DWC3_GUCTL1_PARKMODE_DISABLE_SS;
1029
1030                 dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
1031         }
1032
1033         if (dwc->dr_mode == USB_DR_MODE_HOST ||
1034             dwc->dr_mode == USB_DR_MODE_OTG) {
1035                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL);
1036
1037                 /*
1038                  * Enable Auto retry Feature to make the controller operating in
1039                  * Host mode on seeing transaction errors(CRC errors or internal
1040                  * overrun scenerios) on IN transfers to reply to the device
1041                  * with a non-terminating retry ACK (i.e, an ACK transcation
1042                  * packet with Retry=1 & Nump != 0)
1043                  */
1044                 reg |= DWC3_GUCTL_HSTINAUTORETRY;
1045
1046                 dwc3_writel(dwc->regs, DWC3_GUCTL, reg);
1047         }
1048
1049         /*
1050          * Must config both number of packets and max burst settings to enable
1051          * RX and/or TX threshold.
1052          */
1053         if (!DWC3_IP_IS(DWC3) && dwc->dr_mode == USB_DR_MODE_HOST) {
1054                 u8 rx_thr_num = dwc->rx_thr_num_pkt_prd;
1055                 u8 rx_maxburst = dwc->rx_max_burst_prd;
1056                 u8 tx_thr_num = dwc->tx_thr_num_pkt_prd;
1057                 u8 tx_maxburst = dwc->tx_max_burst_prd;
1058
1059                 if (rx_thr_num && rx_maxburst) {
1060                         reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
1061                         reg |= DWC31_RXTHRNUMPKTSEL_PRD;
1062
1063                         reg &= ~DWC31_RXTHRNUMPKT_PRD(~0);
1064                         reg |= DWC31_RXTHRNUMPKT_PRD(rx_thr_num);
1065
1066                         reg &= ~DWC31_MAXRXBURSTSIZE_PRD(~0);
1067                         reg |= DWC31_MAXRXBURSTSIZE_PRD(rx_maxburst);
1068
1069                         dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
1070                 }
1071
1072                 if (tx_thr_num && tx_maxburst) {
1073                         reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG);
1074                         reg |= DWC31_TXTHRNUMPKTSEL_PRD;
1075
1076                         reg &= ~DWC31_TXTHRNUMPKT_PRD(~0);
1077                         reg |= DWC31_TXTHRNUMPKT_PRD(tx_thr_num);
1078
1079                         reg &= ~DWC31_MAXTXBURSTSIZE_PRD(~0);
1080                         reg |= DWC31_MAXTXBURSTSIZE_PRD(tx_maxburst);
1081
1082                         dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg);
1083                 }
1084         }
1085
1086         return 0;
1087
1088 err4:
1089         phy_power_off(dwc->usb3_generic_phy);
1090
1091 err3:
1092         phy_power_off(dwc->usb2_generic_phy);
1093
1094 err2:
1095         usb_phy_set_suspend(dwc->usb2_phy, 1);
1096         usb_phy_set_suspend(dwc->usb3_phy, 1);
1097
1098 err1:
1099         usb_phy_shutdown(dwc->usb2_phy);
1100         usb_phy_shutdown(dwc->usb3_phy);
1101         phy_exit(dwc->usb2_generic_phy);
1102         phy_exit(dwc->usb3_generic_phy);
1103
1104 err0a:
1105         dwc3_ulpi_exit(dwc);
1106
1107 err0:
1108         return ret;
1109 }
1110
1111 static int dwc3_core_get_phy(struct dwc3 *dwc)
1112 {
1113         struct device           *dev = dwc->dev;
1114         struct device_node      *node = dev->of_node;
1115         int ret;
1116
1117         if (node) {
1118                 dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
1119                 dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
1120         } else {
1121                 dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
1122                 dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
1123         }
1124
1125         if (IS_ERR(dwc->usb2_phy)) {
1126                 ret = PTR_ERR(dwc->usb2_phy);
1127                 if (ret == -ENXIO || ret == -ENODEV) {
1128                         dwc->usb2_phy = NULL;
1129                 } else {
1130                         return dev_err_probe(dev, ret, "no usb2 phy configured\n");
1131                 }
1132         }
1133
1134         if (IS_ERR(dwc->usb3_phy)) {
1135                 ret = PTR_ERR(dwc->usb3_phy);
1136                 if (ret == -ENXIO || ret == -ENODEV) {
1137                         dwc->usb3_phy = NULL;
1138                 } else {
1139                         return dev_err_probe(dev, ret, "no usb3 phy configured\n");
1140                 }
1141         }
1142
1143         dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
1144         if (IS_ERR(dwc->usb2_generic_phy)) {
1145                 ret = PTR_ERR(dwc->usb2_generic_phy);
1146                 if (ret == -ENOSYS || ret == -ENODEV) {
1147                         dwc->usb2_generic_phy = NULL;
1148                 } else {
1149                         return dev_err_probe(dev, ret, "no usb2 phy configured\n");
1150                 }
1151         }
1152
1153         dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
1154         if (IS_ERR(dwc->usb3_generic_phy)) {
1155                 ret = PTR_ERR(dwc->usb3_generic_phy);
1156                 if (ret == -ENOSYS || ret == -ENODEV) {
1157                         dwc->usb3_generic_phy = NULL;
1158                 } else {
1159                         return dev_err_probe(dev, ret, "no usb3 phy configured\n");
1160                 }
1161         }
1162
1163         return 0;
1164 }
1165
1166 static int dwc3_core_init_mode(struct dwc3 *dwc)
1167 {
1168         struct device *dev = dwc->dev;
1169         int ret;
1170
1171         switch (dwc->dr_mode) {
1172         case USB_DR_MODE_PERIPHERAL:
1173                 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
1174
1175                 if (dwc->usb2_phy)
1176                         otg_set_vbus(dwc->usb2_phy->otg, false);
1177                 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
1178                 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
1179
1180                 ret = dwc3_gadget_init(dwc);
1181                 if (ret)
1182                         return dev_err_probe(dev, ret, "failed to initialize gadget\n");
1183                 break;
1184         case USB_DR_MODE_HOST:
1185                 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
1186
1187                 if (dwc->usb2_phy)
1188                         otg_set_vbus(dwc->usb2_phy->otg, true);
1189                 phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
1190                 phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
1191
1192                 ret = dwc3_host_init(dwc);
1193                 if (ret)
1194                         return dev_err_probe(dev, ret, "failed to initialize host\n");
1195                 break;
1196         case USB_DR_MODE_OTG:
1197                 INIT_WORK(&dwc->drd_work, __dwc3_set_mode);
1198                 ret = dwc3_drd_init(dwc);
1199                 if (ret)
1200                         return dev_err_probe(dev, ret, "failed to initialize dual-role\n");
1201                 break;
1202         default:
1203                 dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode);
1204                 return -EINVAL;
1205         }
1206
1207         return 0;
1208 }
1209
1210 static void dwc3_core_exit_mode(struct dwc3 *dwc)
1211 {
1212         switch (dwc->dr_mode) {
1213         case USB_DR_MODE_PERIPHERAL:
1214                 dwc3_gadget_exit(dwc);
1215                 break;
1216         case USB_DR_MODE_HOST:
1217                 dwc3_host_exit(dwc);
1218                 break;
1219         case USB_DR_MODE_OTG:
1220                 dwc3_drd_exit(dwc);
1221                 break;
1222         default:
1223                 /* do nothing */
1224                 break;
1225         }
1226
1227         /* de-assert DRVVBUS for HOST and OTG mode */
1228         dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
1229 }
1230
1231 static void dwc3_get_properties(struct dwc3 *dwc)
1232 {
1233         struct device           *dev = dwc->dev;
1234         u8                      lpm_nyet_threshold;
1235         u8                      tx_de_emphasis;
1236         u8                      hird_threshold;
1237         u8                      rx_thr_num_pkt_prd;
1238         u8                      rx_max_burst_prd;
1239         u8                      tx_thr_num_pkt_prd;
1240         u8                      tx_max_burst_prd;
1241
1242         /* default to highest possible threshold */
1243         lpm_nyet_threshold = 0xf;
1244
1245         /* default to -3.5dB de-emphasis */
1246         tx_de_emphasis = 1;
1247
1248         /*
1249          * default to assert utmi_sleep_n and use maximum allowed HIRD
1250          * threshold value of 0b1100
1251          */
1252         hird_threshold = 12;
1253
1254         dwc->maximum_speed = usb_get_maximum_speed(dev);
1255         dwc->max_ssp_rate = usb_get_maximum_ssp_rate(dev);
1256         dwc->dr_mode = usb_get_dr_mode(dev);
1257         dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node);
1258
1259         dwc->sysdev_is_parent = device_property_read_bool(dev,
1260                                 "linux,sysdev_is_parent");
1261         if (dwc->sysdev_is_parent)
1262                 dwc->sysdev = dwc->dev->parent;
1263         else
1264                 dwc->sysdev = dwc->dev;
1265
1266         dwc->has_lpm_erratum = device_property_read_bool(dev,
1267                                 "snps,has-lpm-erratum");
1268         device_property_read_u8(dev, "snps,lpm-nyet-threshold",
1269                                 &lpm_nyet_threshold);
1270         dwc->is_utmi_l1_suspend = device_property_read_bool(dev,
1271                                 "snps,is-utmi-l1-suspend");
1272         device_property_read_u8(dev, "snps,hird-threshold",
1273                                 &hird_threshold);
1274         dwc->dis_start_transfer_quirk = device_property_read_bool(dev,
1275                                 "snps,dis-start-transfer-quirk");
1276         dwc->usb3_lpm_capable = device_property_read_bool(dev,
1277                                 "snps,usb3_lpm_capable");
1278         dwc->usb2_lpm_disable = device_property_read_bool(dev,
1279                                 "snps,usb2-lpm-disable");
1280         device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
1281                                 &rx_thr_num_pkt_prd);
1282         device_property_read_u8(dev, "snps,rx-max-burst-prd",
1283                                 &rx_max_burst_prd);
1284         device_property_read_u8(dev, "snps,tx-thr-num-pkt-prd",
1285                                 &tx_thr_num_pkt_prd);
1286         device_property_read_u8(dev, "snps,tx-max-burst-prd",
1287                                 &tx_max_burst_prd);
1288
1289         dwc->disable_scramble_quirk = device_property_read_bool(dev,
1290                                 "snps,disable_scramble_quirk");
1291         dwc->u2exit_lfps_quirk = device_property_read_bool(dev,
1292                                 "snps,u2exit_lfps_quirk");
1293         dwc->u2ss_inp3_quirk = device_property_read_bool(dev,
1294                                 "snps,u2ss_inp3_quirk");
1295         dwc->req_p1p2p3_quirk = device_property_read_bool(dev,
1296                                 "snps,req_p1p2p3_quirk");
1297         dwc->del_p1p2p3_quirk = device_property_read_bool(dev,
1298                                 "snps,del_p1p2p3_quirk");
1299         dwc->del_phy_power_chg_quirk = device_property_read_bool(dev,
1300                                 "snps,del_phy_power_chg_quirk");
1301         dwc->lfps_filter_quirk = device_property_read_bool(dev,
1302                                 "snps,lfps_filter_quirk");
1303         dwc->rx_detect_poll_quirk = device_property_read_bool(dev,
1304                                 "snps,rx_detect_poll_quirk");
1305         dwc->dis_u3_susphy_quirk = device_property_read_bool(dev,
1306                                 "snps,dis_u3_susphy_quirk");
1307         dwc->dis_u2_susphy_quirk = device_property_read_bool(dev,
1308                                 "snps,dis_u2_susphy_quirk");
1309         dwc->dis_enblslpm_quirk = device_property_read_bool(dev,
1310                                 "snps,dis_enblslpm_quirk");
1311         dwc->dis_u1_entry_quirk = device_property_read_bool(dev,
1312                                 "snps,dis-u1-entry-quirk");
1313         dwc->dis_u2_entry_quirk = device_property_read_bool(dev,
1314                                 "snps,dis-u2-entry-quirk");
1315         dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev,
1316                                 "snps,dis_rxdet_inp3_quirk");
1317         dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev,
1318                                 "snps,dis-u2-freeclk-exists-quirk");
1319         dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev,
1320                                 "snps,dis-del-phy-power-chg-quirk");
1321         dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev,
1322                                 "snps,dis-tx-ipgap-linecheck-quirk");
1323         dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev,
1324                                 "snps,parkmode-disable-ss-quirk");
1325
1326         dwc->tx_de_emphasis_quirk = device_property_read_bool(dev,
1327                                 "snps,tx_de_emphasis_quirk");
1328         device_property_read_u8(dev, "snps,tx_de_emphasis",
1329                                 &tx_de_emphasis);
1330         device_property_read_string(dev, "snps,hsphy_interface",
1331                                     &dwc->hsphy_interface);
1332         device_property_read_u32(dev, "snps,quirk-frame-length-adjustment",
1333                                  &dwc->fladj);
1334
1335         dwc->dis_metastability_quirk = device_property_read_bool(dev,
1336                                 "snps,dis_metastability_quirk");
1337
1338         dwc->dis_split_quirk = device_property_read_bool(dev,
1339                                 "snps,dis-split-quirk");
1340
1341         dwc->lpm_nyet_threshold = lpm_nyet_threshold;
1342         dwc->tx_de_emphasis = tx_de_emphasis;
1343
1344         dwc->hird_threshold = hird_threshold;
1345
1346         dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd;
1347         dwc->rx_max_burst_prd = rx_max_burst_prd;
1348
1349         dwc->tx_thr_num_pkt_prd = tx_thr_num_pkt_prd;
1350         dwc->tx_max_burst_prd = tx_max_burst_prd;
1351
1352         dwc->imod_interval = 0;
1353 }
1354
1355 /* check whether the core supports IMOD */
1356 bool dwc3_has_imod(struct dwc3 *dwc)
1357 {
1358         return DWC3_VER_IS_WITHIN(DWC3, 300A, ANY) ||
1359                 DWC3_VER_IS_WITHIN(DWC31, 120A, ANY) ||
1360                 DWC3_IP_IS(DWC32);
1361 }
1362
1363 static void dwc3_check_params(struct dwc3 *dwc)
1364 {
1365         struct device *dev = dwc->dev;
1366         unsigned int hwparam_gen =
1367                 DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3);
1368
1369         /* Check for proper value of imod_interval */
1370         if (dwc->imod_interval && !dwc3_has_imod(dwc)) {
1371                 dev_warn(dwc->dev, "Interrupt moderation not supported\n");
1372                 dwc->imod_interval = 0;
1373         }
1374
1375         /*
1376          * Workaround for STAR 9000961433 which affects only version
1377          * 3.00a of the DWC_usb3 core. This prevents the controller
1378          * interrupt from being masked while handling events. IMOD
1379          * allows us to work around this issue. Enable it for the
1380          * affected version.
1381          */
1382         if (!dwc->imod_interval &&
1383             DWC3_VER_IS(DWC3, 300A))
1384                 dwc->imod_interval = 1;
1385
1386         /* Check the maximum_speed parameter */
1387         switch (dwc->maximum_speed) {
1388         case USB_SPEED_LOW:
1389         case USB_SPEED_FULL:
1390         case USB_SPEED_HIGH:
1391                 break;
1392         case USB_SPEED_SUPER:
1393                 if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS)
1394                         dev_warn(dev, "UDC doesn't support Gen 1\n");
1395                 break;
1396         case USB_SPEED_SUPER_PLUS:
1397                 if ((DWC3_IP_IS(DWC32) &&
1398                      hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS) ||
1399                     (!DWC3_IP_IS(DWC32) &&
1400                      hwparam_gen != DWC3_GHWPARAMS3_SSPHY_IFC_GEN2))
1401                         dev_warn(dev, "UDC doesn't support SSP\n");
1402                 break;
1403         default:
1404                 dev_err(dev, "invalid maximum_speed parameter %d\n",
1405                         dwc->maximum_speed);
1406                 fallthrough;
1407         case USB_SPEED_UNKNOWN:
1408                 switch (hwparam_gen) {
1409                 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2:
1410                         dwc->maximum_speed = USB_SPEED_SUPER_PLUS;
1411                         break;
1412                 case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1:
1413                         if (DWC3_IP_IS(DWC32))
1414                                 dwc->maximum_speed = USB_SPEED_SUPER_PLUS;
1415                         else
1416                                 dwc->maximum_speed = USB_SPEED_SUPER;
1417                         break;
1418                 case DWC3_GHWPARAMS3_SSPHY_IFC_DIS:
1419                         dwc->maximum_speed = USB_SPEED_HIGH;
1420                         break;
1421                 default:
1422                         dwc->maximum_speed = USB_SPEED_SUPER;
1423                         break;
1424                 }
1425                 break;
1426         }
1427
1428         /*
1429          * Currently the controller does not have visibility into the HW
1430          * parameter to determine the maximum number of lanes the HW supports.
1431          * If the number of lanes is not specified in the device property, then
1432          * set the default to support dual-lane for DWC_usb32 and single-lane
1433          * for DWC_usb31 for super-speed-plus.
1434          */
1435         if (dwc->maximum_speed == USB_SPEED_SUPER_PLUS) {
1436                 switch (dwc->max_ssp_rate) {
1437                 case USB_SSP_GEN_2x1:
1438                         if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_GEN1)
1439                                 dev_warn(dev, "UDC only supports Gen 1\n");
1440                         break;
1441                 case USB_SSP_GEN_1x2:
1442                 case USB_SSP_GEN_2x2:
1443                         if (DWC3_IP_IS(DWC31))
1444                                 dev_warn(dev, "UDC only supports single lane\n");
1445                         break;
1446                 case USB_SSP_GEN_UNKNOWN:
1447                 default:
1448                         switch (hwparam_gen) {
1449                         case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2:
1450                                 if (DWC3_IP_IS(DWC32))
1451                                         dwc->max_ssp_rate = USB_SSP_GEN_2x2;
1452                                 else
1453                                         dwc->max_ssp_rate = USB_SSP_GEN_2x1;
1454                                 break;
1455                         case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1:
1456                                 if (DWC3_IP_IS(DWC32))
1457                                         dwc->max_ssp_rate = USB_SSP_GEN_1x2;
1458                                 break;
1459                         }
1460                         break;
1461                 }
1462         }
1463 }
1464
1465 static int dwc3_probe(struct platform_device *pdev)
1466 {
1467         struct device           *dev = &pdev->dev;
1468         struct resource         *res, dwc_res;
1469         struct dwc3             *dwc;
1470
1471         int                     ret;
1472
1473         void __iomem            *regs;
1474
1475         dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
1476         if (!dwc)
1477                 return -ENOMEM;
1478
1479         dwc->dev = dev;
1480
1481         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1482         if (!res) {
1483                 dev_err(dev, "missing memory resource\n");
1484                 return -ENODEV;
1485         }
1486
1487         dwc->xhci_resources[0].start = res->start;
1488         dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
1489                                         DWC3_XHCI_REGS_END;
1490         dwc->xhci_resources[0].flags = res->flags;
1491         dwc->xhci_resources[0].name = res->name;
1492
1493         /*
1494          * Request memory region but exclude xHCI regs,
1495          * since it will be requested by the xhci-plat driver.
1496          */
1497         dwc_res = *res;
1498         dwc_res.start += DWC3_GLOBALS_REGS_START;
1499
1500         regs = devm_ioremap_resource(dev, &dwc_res);
1501         if (IS_ERR(regs))
1502                 return PTR_ERR(regs);
1503
1504         dwc->regs       = regs;
1505         dwc->regs_size  = resource_size(&dwc_res);
1506
1507         dwc3_get_properties(dwc);
1508
1509         dwc->reset = devm_reset_control_array_get_optional_shared(dev);
1510         if (IS_ERR(dwc->reset))
1511                 return PTR_ERR(dwc->reset);
1512
1513         if (dev->of_node) {
1514                 ret = devm_clk_bulk_get_all(dev, &dwc->clks);
1515                 if (ret == -EPROBE_DEFER)
1516                         return ret;
1517                 /*
1518                  * Clocks are optional, but new DT platforms should support all
1519                  * clocks as required by the DT-binding.
1520                  */
1521                 if (ret < 0)
1522                         dwc->num_clks = 0;
1523                 else
1524                         dwc->num_clks = ret;
1525
1526         }
1527
1528         ret = reset_control_deassert(dwc->reset);
1529         if (ret)
1530                 return ret;
1531
1532         ret = clk_bulk_prepare_enable(dwc->num_clks, dwc->clks);
1533         if (ret)
1534                 goto assert_reset;
1535
1536         if (!dwc3_core_is_valid(dwc)) {
1537                 dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
1538                 ret = -ENODEV;
1539                 goto disable_clks;
1540         }
1541
1542         platform_set_drvdata(pdev, dwc);
1543         dwc3_cache_hwparams(dwc);
1544
1545         spin_lock_init(&dwc->lock);
1546
1547         pm_runtime_set_active(dev);
1548         pm_runtime_use_autosuspend(dev);
1549         pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);
1550         pm_runtime_enable(dev);
1551         ret = pm_runtime_get_sync(dev);
1552         if (ret < 0)
1553                 goto err1;
1554
1555         pm_runtime_forbid(dev);
1556
1557         ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
1558         if (ret) {
1559                 dev_err(dwc->dev, "failed to allocate event buffers\n");
1560                 ret = -ENOMEM;
1561                 goto err2;
1562         }
1563
1564         ret = dwc3_get_dr_mode(dwc);
1565         if (ret)
1566                 goto err3;
1567
1568         ret = dwc3_alloc_scratch_buffers(dwc);
1569         if (ret)
1570                 goto err3;
1571
1572         ret = dwc3_core_init(dwc);
1573         if (ret) {
1574                 dev_err_probe(dev, ret, "failed to initialize core\n");
1575                 goto err4;
1576         }
1577
1578         dwc3_check_params(dwc);
1579
1580         ret = dwc3_core_init_mode(dwc);
1581         if (ret)
1582                 goto err5;
1583
1584         dwc3_debugfs_init(dwc);
1585         pm_runtime_put(dev);
1586
1587         return 0;
1588
1589 err5:
1590         dwc3_event_buffers_cleanup(dwc);
1591
1592         usb_phy_shutdown(dwc->usb2_phy);
1593         usb_phy_shutdown(dwc->usb3_phy);
1594         phy_exit(dwc->usb2_generic_phy);
1595         phy_exit(dwc->usb3_generic_phy);
1596
1597         usb_phy_set_suspend(dwc->usb2_phy, 1);
1598         usb_phy_set_suspend(dwc->usb3_phy, 1);
1599         phy_power_off(dwc->usb2_generic_phy);
1600         phy_power_off(dwc->usb3_generic_phy);
1601
1602         dwc3_ulpi_exit(dwc);
1603
1604 err4:
1605         dwc3_free_scratch_buffers(dwc);
1606
1607 err3:
1608         dwc3_free_event_buffers(dwc);
1609
1610 err2:
1611         pm_runtime_allow(&pdev->dev);
1612
1613 err1:
1614         pm_runtime_put_sync(&pdev->dev);
1615         pm_runtime_disable(&pdev->dev);
1616
1617 disable_clks:
1618         clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
1619 assert_reset:
1620         reset_control_assert(dwc->reset);
1621
1622         return ret;
1623 }
1624
1625 static int dwc3_remove(struct platform_device *pdev)
1626 {
1627         struct dwc3     *dwc = platform_get_drvdata(pdev);
1628
1629         pm_runtime_get_sync(&pdev->dev);
1630
1631         dwc3_debugfs_exit(dwc);
1632         dwc3_core_exit_mode(dwc);
1633
1634         dwc3_core_exit(dwc);
1635         dwc3_ulpi_exit(dwc);
1636
1637         pm_runtime_disable(&pdev->dev);
1638         pm_runtime_put_noidle(&pdev->dev);
1639         pm_runtime_set_suspended(&pdev->dev);
1640
1641         dwc3_free_event_buffers(dwc);
1642         dwc3_free_scratch_buffers(dwc);
1643
1644         return 0;
1645 }
1646
1647 #ifdef CONFIG_PM
1648 static int dwc3_core_init_for_resume(struct dwc3 *dwc)
1649 {
1650         int ret;
1651
1652         ret = reset_control_deassert(dwc->reset);
1653         if (ret)
1654                 return ret;
1655
1656         ret = clk_bulk_prepare_enable(dwc->num_clks, dwc->clks);
1657         if (ret)
1658                 goto assert_reset;
1659
1660         ret = dwc3_core_init(dwc);
1661         if (ret)
1662                 goto disable_clks;
1663
1664         return 0;
1665
1666 disable_clks:
1667         clk_bulk_disable_unprepare(dwc->num_clks, dwc->clks);
1668 assert_reset:
1669         reset_control_assert(dwc->reset);
1670
1671         return ret;
1672 }
1673
1674 static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
1675 {
1676         unsigned long   flags;
1677         u32 reg;
1678
1679         switch (dwc->current_dr_role) {
1680         case DWC3_GCTL_PRTCAP_DEVICE:
1681                 if (pm_runtime_suspended(dwc->dev))
1682                         break;
1683                 spin_lock_irqsave(&dwc->lock, flags);
1684                 dwc3_gadget_suspend(dwc);
1685                 spin_unlock_irqrestore(&dwc->lock, flags);
1686                 synchronize_irq(dwc->irq_gadget);
1687                 dwc3_core_exit(dwc);
1688                 break;
1689         case DWC3_GCTL_PRTCAP_HOST:
1690                 if (!PMSG_IS_AUTO(msg)) {
1691                         dwc3_core_exit(dwc);
1692                         break;
1693                 }
1694
1695                 /* Let controller to suspend HSPHY before PHY driver suspends */
1696                 if (dwc->dis_u2_susphy_quirk ||
1697                     dwc->dis_enblslpm_quirk) {
1698                         reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
1699                         reg |=  DWC3_GUSB2PHYCFG_ENBLSLPM |
1700                                 DWC3_GUSB2PHYCFG_SUSPHY;
1701                         dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
1702
1703                         /* Give some time for USB2 PHY to suspend */
1704                         usleep_range(5000, 6000);
1705                 }
1706
1707                 phy_pm_runtime_put_sync(dwc->usb2_generic_phy);
1708                 phy_pm_runtime_put_sync(dwc->usb3_generic_phy);
1709                 break;
1710         case DWC3_GCTL_PRTCAP_OTG:
1711                 /* do nothing during runtime_suspend */
1712                 if (PMSG_IS_AUTO(msg))
1713                         break;
1714
1715                 if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
1716                         spin_lock_irqsave(&dwc->lock, flags);
1717                         dwc3_gadget_suspend(dwc);
1718                         spin_unlock_irqrestore(&dwc->lock, flags);
1719                         synchronize_irq(dwc->irq_gadget);
1720                 }
1721
1722                 dwc3_otg_exit(dwc);
1723                 dwc3_core_exit(dwc);
1724                 break;
1725         default:
1726                 /* do nothing */
1727                 break;
1728         }
1729
1730         return 0;
1731 }
1732
1733 static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
1734 {
1735         unsigned long   flags;
1736         int             ret;
1737         u32             reg;
1738
1739         switch (dwc->current_dr_role) {
1740         case DWC3_GCTL_PRTCAP_DEVICE:
1741                 ret = dwc3_core_init_for_resume(dwc);
1742                 if (ret)
1743                         return ret;
1744
1745                 dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
1746                 spin_lock_irqsave(&dwc->lock, flags);
1747                 dwc3_gadget_resume(dwc);
1748                 spin_unlock_irqrestore(&dwc->lock, flags);
1749                 break;
1750         case DWC3_GCTL_PRTCAP_HOST:
1751                 if (!PMSG_IS_AUTO(msg)) {
1752                         ret = dwc3_core_init_for_resume(dwc);
1753                         if (ret)
1754                                 return ret;
1755                         dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
1756                         break;
1757                 }
1758                 /* Restore GUSB2PHYCFG bits that were modified in suspend */
1759                 reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
1760                 if (dwc->dis_u2_susphy_quirk)
1761                         reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
1762
1763                 if (dwc->dis_enblslpm_quirk)
1764                         reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
1765
1766                 dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
1767
1768                 phy_pm_runtime_get_sync(dwc->usb2_generic_phy);
1769                 phy_pm_runtime_get_sync(dwc->usb3_generic_phy);
1770                 break;
1771         case DWC3_GCTL_PRTCAP_OTG:
1772                 /* nothing to do on runtime_resume */
1773                 if (PMSG_IS_AUTO(msg))
1774                         break;
1775
1776                 ret = dwc3_core_init_for_resume(dwc);
1777                 if (ret)
1778                         return ret;
1779
1780                 dwc3_set_prtcap(dwc, dwc->current_dr_role);
1781
1782                 dwc3_otg_init(dwc);
1783                 if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST) {
1784                         dwc3_otg_host_init(dwc);
1785                 } else if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
1786                         spin_lock_irqsave(&dwc->lock, flags);
1787                         dwc3_gadget_resume(dwc);
1788                         spin_unlock_irqrestore(&dwc->lock, flags);
1789                 }
1790
1791                 break;
1792         default:
1793                 /* do nothing */
1794                 break;
1795         }
1796
1797         return 0;
1798 }
1799
1800 static int dwc3_runtime_checks(struct dwc3 *dwc)
1801 {
1802         switch (dwc->current_dr_role) {
1803         case DWC3_GCTL_PRTCAP_DEVICE:
1804                 if (dwc->connected)
1805                         return -EBUSY;
1806                 break;
1807         case DWC3_GCTL_PRTCAP_HOST:
1808         default:
1809                 /* do nothing */
1810                 break;
1811         }
1812
1813         return 0;
1814 }
1815
1816 static int dwc3_runtime_suspend(struct device *dev)
1817 {
1818         struct dwc3     *dwc = dev_get_drvdata(dev);
1819         int             ret;
1820
1821         if (dwc3_runtime_checks(dwc))
1822                 return -EBUSY;
1823
1824         ret = dwc3_suspend_common(dwc, PMSG_AUTO_SUSPEND);
1825         if (ret)
1826                 return ret;
1827
1828         device_init_wakeup(dev, true);
1829
1830         return 0;
1831 }
1832
1833 static int dwc3_runtime_resume(struct device *dev)
1834 {
1835         struct dwc3     *dwc = dev_get_drvdata(dev);
1836         int             ret;
1837
1838         device_init_wakeup(dev, false);
1839
1840         ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME);
1841         if (ret)
1842                 return ret;
1843
1844         switch (dwc->current_dr_role) {
1845         case DWC3_GCTL_PRTCAP_DEVICE:
1846                 dwc3_gadget_process_pending_events(dwc);
1847                 break;
1848         case DWC3_GCTL_PRTCAP_HOST:
1849         default:
1850                 /* do nothing */
1851                 break;
1852         }
1853
1854         pm_runtime_mark_last_busy(dev);
1855
1856         return 0;
1857 }
1858
1859 static int dwc3_runtime_idle(struct device *dev)
1860 {
1861         struct dwc3     *dwc = dev_get_drvdata(dev);
1862
1863         switch (dwc->current_dr_role) {
1864         case DWC3_GCTL_PRTCAP_DEVICE:
1865                 if (dwc3_runtime_checks(dwc))
1866                         return -EBUSY;
1867                 break;
1868         case DWC3_GCTL_PRTCAP_HOST:
1869         default:
1870                 /* do nothing */
1871                 break;
1872         }
1873
1874         pm_runtime_mark_last_busy(dev);
1875         pm_runtime_autosuspend(dev);
1876
1877         return 0;
1878 }
1879 #endif /* CONFIG_PM */
1880
1881 #ifdef CONFIG_PM_SLEEP
1882 static int dwc3_suspend(struct device *dev)
1883 {
1884         struct dwc3     *dwc = dev_get_drvdata(dev);
1885         int             ret;
1886
1887         ret = dwc3_suspend_common(dwc, PMSG_SUSPEND);
1888         if (ret)
1889                 return ret;
1890
1891         pinctrl_pm_select_sleep_state(dev);
1892
1893         return 0;
1894 }
1895
1896 static int dwc3_resume(struct device *dev)
1897 {
1898         struct dwc3     *dwc = dev_get_drvdata(dev);
1899         int             ret;
1900
1901         pinctrl_pm_select_default_state(dev);
1902
1903         ret = dwc3_resume_common(dwc, PMSG_RESUME);
1904         if (ret)
1905                 return ret;
1906
1907         pm_runtime_disable(dev);
1908         pm_runtime_set_active(dev);
1909         pm_runtime_enable(dev);
1910
1911         return 0;
1912 }
1913
1914 static void dwc3_complete(struct device *dev)
1915 {
1916         struct dwc3     *dwc = dev_get_drvdata(dev);
1917         u32             reg;
1918
1919         if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST &&
1920                         dwc->dis_split_quirk) {
1921                 reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
1922                 reg |= DWC3_GUCTL3_SPLITDISABLE;
1923                 dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
1924         }
1925 }
1926 #else
1927 #define dwc3_complete NULL
1928 #endif /* CONFIG_PM_SLEEP */
1929
1930 static const struct dev_pm_ops dwc3_dev_pm_ops = {
1931         SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
1932         .complete = dwc3_complete,
1933         SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume,
1934                         dwc3_runtime_idle)
1935 };
1936
1937 #ifdef CONFIG_OF
1938 static const struct of_device_id of_dwc3_match[] = {
1939         {
1940                 .compatible = "snps,dwc3"
1941         },
1942         {
1943                 .compatible = "synopsys,dwc3"
1944         },
1945         { },
1946 };
1947 MODULE_DEVICE_TABLE(of, of_dwc3_match);
1948 #endif
1949
1950 #ifdef CONFIG_ACPI
1951
1952 #define ACPI_ID_INTEL_BSW       "808622B7"
1953
1954 static const struct acpi_device_id dwc3_acpi_match[] = {
1955         { ACPI_ID_INTEL_BSW, 0 },
1956         { },
1957 };
1958 MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match);
1959 #endif
1960
1961 static struct platform_driver dwc3_driver = {
1962         .probe          = dwc3_probe,
1963         .remove         = dwc3_remove,
1964         .driver         = {
1965                 .name   = "dwc3",
1966                 .of_match_table = of_match_ptr(of_dwc3_match),
1967                 .acpi_match_table = ACPI_PTR(dwc3_acpi_match),
1968                 .pm     = &dwc3_dev_pm_ops,
1969         },
1970 };
1971
1972 module_platform_driver(dwc3_driver);
1973
1974 MODULE_ALIAS("platform:dwc3");
1975 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
1976 MODULE_LICENSE("GPL v2");
1977 MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver");