1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * core.c - DesignWare USB3 DRD Controller Core file
   4 *
   5 * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com
   6 *
   7 * Authors: Felipe Balbi <balbi@ti.com>,
   8 *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   9 */
  10
  11#include <linux/clk.h>
  12#include <linux/version.h>
  13#include <linux/module.h>
  14#include <linux/kernel.h>
  15#include <linux/slab.h>
  16#include <linux/spinlock.h>
  17#include <linux/platform_device.h>
  18#include <linux/pm_runtime.h>
  19#include <linux/interrupt.h>
  20#include <linux/ioport.h>
  21#include <linux/io.h>
  22#include <linux/list.h>
  23#include <linux/delay.h>
  24#include <linux/dma-mapping.h>
  25#include <linux/of.h>
  26#include <linux/of_graph.h>
  27#include <linux/acpi.h>
  28#include <linux/pinctrl/consumer.h>
  29#include <linux/reset.h>
  30#include <linux/bitfield.h>
  31
  32#include <linux/usb/ch9.h>
  33#include <linux/usb/gadget.h>
  34#include <linux/usb/of.h>
  35#include <linux/usb/otg.h>
  36
  37#include "core.h"
  38#include "gadget.h"
  39#include "io.h"
  40
  41#include "debug.h"
  42
  43#define DWC3_DEFAULT_AUTOSUSPEND_DELAY	5000 /* ms */
  44
  45/**
  46 * dwc3_get_dr_mode - Validates and sets dr_mode
  47 * @dwc: pointer to our context structure
  48 */
  49static int dwc3_get_dr_mode(struct dwc3 *dwc)
  50{
  51	enum usb_dr_mode mode;
  52	struct device *dev = dwc->dev;
  53	unsigned int hw_mode;
  54
  55	if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
  56		dwc->dr_mode = USB_DR_MODE_OTG;
  57
  58	mode = dwc->dr_mode;
  59	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
  60
  61	switch (hw_mode) {
  62	case DWC3_GHWPARAMS0_MODE_GADGET:
  63		if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) {
  64			dev_err(dev,
  65				"Controller does not support host mode.\n");
  66			return -EINVAL;
  67		}
  68		mode = USB_DR_MODE_PERIPHERAL;
  69		break;
  70	case DWC3_GHWPARAMS0_MODE_HOST:
  71		if (IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
  72			dev_err(dev,
  73				"Controller does not support device mode.\n");
  74			return -EINVAL;
  75		}
  76		mode = USB_DR_MODE_HOST;
  77		break;
  78	default:
  79		if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
  80			mode = USB_DR_MODE_HOST;
  81		else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
  82			mode = USB_DR_MODE_PERIPHERAL;
  83
  84		/*
  85		 * DWC_usb31 and DWC_usb3 v3.30a and higher do not support OTG
  86		 * mode. If the controller supports DRD but the dr_mode is not
  87		 * specified or set to OTG, then set the mode to peripheral.
  88		 */
  89		if (mode == USB_DR_MODE_OTG && !dwc->edev &&
  90		    (!IS_ENABLED(CONFIG_USB_ROLE_SWITCH) ||
  91		     !device_property_read_bool(dwc->dev, "usb-role-switch")) &&
  92		    !DWC3_VER_IS_PRIOR(DWC3, 330A))
  93			mode = USB_DR_MODE_PERIPHERAL;
  94	}
  95
  96	if (mode != dwc->dr_mode) {
  97		dev_warn(dev,
  98			 "Configuration mismatch. dr_mode forced to %s\n",
  99			 mode == USB_DR_MODE_HOST ? "host" : "gadget");
 100
 101		dwc->dr_mode = mode;
 102	}
 103
 104	return 0;
 105}
 106
 107void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode)
 108{
 109	u32 reg;
 110
 111	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 112	reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG));
 113	reg |= DWC3_GCTL_PRTCAPDIR(mode);
 114	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 115
 116	dwc->current_dr_role = mode;
 117}
 118
 
 
 119static void __dwc3_set_mode(struct work_struct *work)
 120{
 121	struct dwc3 *dwc = work_to_dwc(work);
 122	unsigned long flags;
 123	int ret;
 124	u32 reg;
 125	u32 desired_dr_role;
 126
 127	mutex_lock(&dwc->mutex);
 128	spin_lock_irqsave(&dwc->lock, flags);
 129	desired_dr_role = dwc->desired_dr_role;
 130	spin_unlock_irqrestore(&dwc->lock, flags);
 131
 132	pm_runtime_get_sync(dwc->dev);
 133
 134	if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG)
 135		dwc3_otg_update(dwc, 0);
 136
 137	if (!desired_dr_role)
 138		goto out;
 139
 140	if (desired_dr_role == dwc->current_dr_role)
 141		goto out;
 142
 143	if (desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev)
 144		goto out;
 145
 146	switch (dwc->current_dr_role) {
 147	case DWC3_GCTL_PRTCAP_HOST:
 148		dwc3_host_exit(dwc);
 149		break;
 150	case DWC3_GCTL_PRTCAP_DEVICE:
 151		dwc3_gadget_exit(dwc);
 152		dwc3_event_buffers_cleanup(dwc);
 153		break;
 154	case DWC3_GCTL_PRTCAP_OTG:
 155		dwc3_otg_exit(dwc);
 156		spin_lock_irqsave(&dwc->lock, flags);
 157		dwc->desired_otg_role = DWC3_OTG_ROLE_IDLE;
 158		spin_unlock_irqrestore(&dwc->lock, flags);
 159		dwc3_otg_update(dwc, 1);
 160		break;
 161	default:
 162		break;
 163	}
 164
 165	/*
 166	 * When current_dr_role is not set, there's no role switching.
 167	 * Only perform GCTL.CoreSoftReset when there's DRD role switching.
 168	 */
 169	if (dwc->current_dr_role && ((DWC3_IP_IS(DWC3) ||
 170			DWC3_VER_IS_PRIOR(DWC31, 190A)) &&
 171			desired_dr_role != DWC3_GCTL_PRTCAP_OTG)) {
 172		reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 173		reg |= DWC3_GCTL_CORESOFTRESET;
 174		dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 175
 176		/*
 177		 * Wait for internal clocks to synchronized. DWC_usb31 and
 178		 * DWC_usb32 may need at least 50ms (less for DWC_usb3). To
 179		 * keep it consistent across different IPs, let's wait up to
 180		 * 100ms before clearing GCTL.CORESOFTRESET.
 181		 */
 182		msleep(100);
 183
 184		reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 185		reg &= ~DWC3_GCTL_CORESOFTRESET;
 186		dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 187	}
 188
 189	spin_lock_irqsave(&dwc->lock, flags);
 190
 191	dwc3_set_prtcap(dwc, desired_dr_role);
 192
 193	spin_unlock_irqrestore(&dwc->lock, flags);
 194
 195	switch (desired_dr_role) {
 196	case DWC3_GCTL_PRTCAP_HOST:
 197		ret = dwc3_host_init(dwc);
 198		if (ret) {
 199			dev_err(dwc->dev, "failed to initialize host\n");
 200		} else {
 201			if (dwc->usb2_phy)
 202				otg_set_vbus(dwc->usb2_phy->otg, true);
 203			phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
 204			phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
 205			if (dwc->dis_split_quirk) {
 206				reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
 207				reg |= DWC3_GUCTL3_SPLITDISABLE;
 208				dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
 209			}
 210		}
 211		break;
 212	case DWC3_GCTL_PRTCAP_DEVICE:
 213		dwc3_core_soft_reset(dwc);
 214
 215		dwc3_event_buffers_setup(dwc);
 216
 217		if (dwc->usb2_phy)
 218			otg_set_vbus(dwc->usb2_phy->otg, false);
 219		phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
 220		phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
 221
 222		ret = dwc3_gadget_init(dwc);
 223		if (ret)
 224			dev_err(dwc->dev, "failed to initialize peripheral\n");
 225		break;
 226	case DWC3_GCTL_PRTCAP_OTG:
 227		dwc3_otg_init(dwc);
 228		dwc3_otg_update(dwc, 0);
 229		break;
 230	default:
 231		break;
 232	}
 233
 234out:
 235	pm_runtime_mark_last_busy(dwc->dev);
 236	pm_runtime_put_autosuspend(dwc->dev);
 237	mutex_unlock(&dwc->mutex);
 238}
 239
 240void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
 241{
 242	unsigned long flags;
 243
 244	if (dwc->dr_mode != USB_DR_MODE_OTG)
 245		return;
 246
 247	spin_lock_irqsave(&dwc->lock, flags);
 248	dwc->desired_dr_role = mode;
 249	spin_unlock_irqrestore(&dwc->lock, flags);
 250
 251	queue_work(system_freezable_wq, &dwc->drd_work);
 252}
 253
 254u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type)
 255{
 256	struct dwc3		*dwc = dep->dwc;
 257	u32			reg;
 258
 259	dwc3_writel(dwc->regs, DWC3_GDBGFIFOSPACE,
 260			DWC3_GDBGFIFOSPACE_NUM(dep->number) |
 261			DWC3_GDBGFIFOSPACE_TYPE(type));
 262
 263	reg = dwc3_readl(dwc->regs, DWC3_GDBGFIFOSPACE);
 264
 265	return DWC3_GDBGFIFOSPACE_SPACE_AVAILABLE(reg);
 266}
 267
 268/**
 269 * dwc3_core_soft_reset - Issues core soft reset and PHY reset
 270 * @dwc: pointer to our context structure
 271 */
 272int dwc3_core_soft_reset(struct dwc3 *dwc)
 273{
 274	u32		reg;
 275	int		retries = 1000;
 276
 277	/*
 278	 * We're resetting only the device side because, if we're in host mode,
 279	 * XHCI driver will reset the host block. If dwc3 was configured for
 280	 * host-only mode, then we can return early.
 281	 */
 282	if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
 283		return 0;
 284
 285	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 286	reg |= DWC3_DCTL_CSFTRST;
 287	reg &= ~DWC3_DCTL_RUN_STOP;
 288	dwc3_gadget_dctl_write_safe(dwc, reg);
 289
 290	/*
 291	 * For DWC_usb31 controller 1.90a and later, the DCTL.CSFRST bit
 292	 * is cleared only after all the clocks are synchronized. This can
 293	 * take a little more than 50ms. Set the polling rate at 20ms
 294	 * for 10 times instead.
 295	 */
 296	if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32))
 297		retries = 10;
 298
 299	do {
 300		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 301		if (!(reg & DWC3_DCTL_CSFTRST))
 302			goto done;
 303
 304		if (DWC3_VER_IS_WITHIN(DWC31, 190A, ANY) || DWC3_IP_IS(DWC32))
 305			msleep(20);
 306		else
 307			udelay(1);
 308	} while (--retries);
 309
 310	dev_warn(dwc->dev, "DWC3 controller soft reset failed.\n");
 311	return -ETIMEDOUT;
 312
 313done:
 314	/*
 315	 * For DWC_usb31 controller 1.80a and prior, once DCTL.CSFRST bit
 316	 * is cleared, we must wait at least 50ms before accessing the PHY
 317	 * domain (synchronization delay).
 318	 */
 319	if (DWC3_VER_IS_WITHIN(DWC31, ANY, 180A))
 320		msleep(50);
 321
 322	return 0;
 323}
 324
 325/*
 326 * dwc3_frame_length_adjustment - Adjusts frame length if required
 327 * @dwc3: Pointer to our controller context structure
 328 */
 329static void dwc3_frame_length_adjustment(struct dwc3 *dwc)
 330{
 331	u32 reg;
 332	u32 dft;
 333
 334	if (DWC3_VER_IS_PRIOR(DWC3, 250A))
 335		return;
 336
 337	if (dwc->fladj == 0)
 338		return;
 339
 340	reg = dwc3_readl(dwc->regs, DWC3_GFLADJ);
 341	dft = reg & DWC3_GFLADJ_30MHZ_MASK;
 342	if (dft != dwc->fladj) {
 343		reg &= ~DWC3_GFLADJ_30MHZ_MASK;
 344		reg |= DWC3_GFLADJ_30MHZ_SDBND_SEL | dwc->fladj;
 345		dwc3_writel(dwc->regs, DWC3_GFLADJ, reg);
 346	}
 347}
 348
 349/**
 350 * dwc3_ref_clk_period - Reference clock period configuration
 351 *		Default reference clock period depends on hardware
 352 *		configuration. For systems with reference clock that differs
 353 *		from the default, this will set clock period in DWC3_GUCTL
 354 *		register.
 355 * @dwc: Pointer to our controller context structure
 356 */
 357static void dwc3_ref_clk_period(struct dwc3 *dwc)
 358{
 359	unsigned long period;
 360	unsigned long fladj;
 361	unsigned long decr;
 362	unsigned long rate;
 363	u32 reg;
 364
 365	if (dwc->ref_clk) {
 366		rate = clk_get_rate(dwc->ref_clk);
 367		if (!rate)
 368			return;
 369		period = NSEC_PER_SEC / rate;
 370	} else if (dwc->ref_clk_per) {
 371		period = dwc->ref_clk_per;
 372		rate = NSEC_PER_SEC / period;
 373	} else {
 374		return;
 375	}
 376
 377	reg = dwc3_readl(dwc->regs, DWC3_GUCTL);
 378	reg &= ~DWC3_GUCTL_REFCLKPER_MASK;
 379	reg |=  FIELD_PREP(DWC3_GUCTL_REFCLKPER_MASK, period);
 380	dwc3_writel(dwc->regs, DWC3_GUCTL, reg);
 381
 382	if (DWC3_VER_IS_PRIOR(DWC3, 250A))
 383		return;
 384
 385	/*
 386	 * The calculation below is
 387	 *
 388	 * 125000 * (NSEC_PER_SEC / (rate * period) - 1)
 389	 *
 390	 * but rearranged for fixed-point arithmetic. The division must be
 391	 * 64-bit because 125000 * NSEC_PER_SEC doesn't fit in 32 bits (and
 392	 * neither does rate * period).
 393	 *
 394	 * Note that rate * period ~= NSEC_PER_SECOND, minus the number of
 395	 * nanoseconds of error caused by the truncation which happened during
 396	 * the division when calculating rate or period (whichever one was
 397	 * derived from the other). We first calculate the relative error, then
 398	 * scale it to units of 8 ppm.
 399	 */
 400	fladj = div64_u64(125000ULL * NSEC_PER_SEC, (u64)rate * period);
 401	fladj -= 125000;
 402
 403	/*
 404	 * The documented 240MHz constant is scaled by 2 to get PLS1 as well.
 405	 */
 406	decr = 480000000 / rate;
 407
 408	reg = dwc3_readl(dwc->regs, DWC3_GFLADJ);
 409	reg &= ~DWC3_GFLADJ_REFCLK_FLADJ_MASK
 410	    &  ~DWC3_GFLADJ_240MHZDECR
 411	    &  ~DWC3_GFLADJ_240MHZDECR_PLS1;
 412	reg |= FIELD_PREP(DWC3_GFLADJ_REFCLK_FLADJ_MASK, fladj)
 413	    |  FIELD_PREP(DWC3_GFLADJ_240MHZDECR, decr >> 1)
 414	    |  FIELD_PREP(DWC3_GFLADJ_240MHZDECR_PLS1, decr & 1);
 415
 416	if (dwc->gfladj_refclk_lpm_sel)
 417		reg |=  DWC3_GFLADJ_REFCLK_LPM_SEL;
 418
 419	dwc3_writel(dwc->regs, DWC3_GFLADJ, reg);
 420}
 421
 422/**
 423 * dwc3_free_one_event_buffer - Frees one event buffer
 424 * @dwc: Pointer to our controller context structure
 425 * @evt: Pointer to event buffer to be freed
 426 */
 427static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
 428		struct dwc3_event_buffer *evt)
 429{
 430	dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma);
 431}
 432
 433/**
 434 * dwc3_alloc_one_event_buffer - Allocates one event buffer structure
 435 * @dwc: Pointer to our controller context structure
 436 * @length: size of the event buffer
 437 *
 438 * Returns a pointer to the allocated event buffer structure on success
 439 * otherwise ERR_PTR(errno).
 440 */
 441static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,
 442		unsigned int length)
 443{
 444	struct dwc3_event_buffer	*evt;
 445
 446	evt = devm_kzalloc(dwc->dev, sizeof(*evt), GFP_KERNEL);
 447	if (!evt)
 448		return ERR_PTR(-ENOMEM);
 449
 450	evt->dwc	= dwc;
 451	evt->length	= length;
 452	evt->cache	= devm_kzalloc(dwc->dev, length, GFP_KERNEL);
 453	if (!evt->cache)
 454		return ERR_PTR(-ENOMEM);
 455
 456	evt->buf	= dma_alloc_coherent(dwc->sysdev, length,
 457			&evt->dma, GFP_KERNEL);
 458	if (!evt->buf)
 459		return ERR_PTR(-ENOMEM);
 460
 461	return evt;
 462}
 463
 464/**
 465 * dwc3_free_event_buffers - frees all allocated event buffers
 466 * @dwc: Pointer to our controller context structure
 467 */
 468static void dwc3_free_event_buffers(struct dwc3 *dwc)
 469{
 470	struct dwc3_event_buffer	*evt;
 471
 472	evt = dwc->ev_buf;
 473	if (evt)
 474		dwc3_free_one_event_buffer(dwc, evt);
 475}
 476
 477/**
 478 * dwc3_alloc_event_buffers - Allocates @num event buffers of size @length
 479 * @dwc: pointer to our controller context structure
 480 * @length: size of event buffer
 481 *
 482 * Returns 0 on success otherwise negative errno. In the error case, dwc
 483 * may contain some buffers allocated but not all which were requested.
 484 */
 485static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned int length)
 486{
 487	struct dwc3_event_buffer *evt;
 488
 489	evt = dwc3_alloc_one_event_buffer(dwc, length);
 490	if (IS_ERR(evt)) {
 491		dev_err(dwc->dev, "can't allocate event buffer\n");
 492		return PTR_ERR(evt);
 493	}
 494	dwc->ev_buf = evt;
 495
 496	return 0;
 497}
 498
 499/**
 500 * dwc3_event_buffers_setup - setup our allocated event buffers
 501 * @dwc: pointer to our controller context structure
 502 *
 503 * Returns 0 on success otherwise negative errno.
 504 */
 505int dwc3_event_buffers_setup(struct dwc3 *dwc)
 506{
 507	struct dwc3_event_buffer	*evt;
 508
 509	evt = dwc->ev_buf;
 510	evt->lpos = 0;
 511	dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0),
 512			lower_32_bits(evt->dma));
 513	dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0),
 514			upper_32_bits(evt->dma));
 515	dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
 516			DWC3_GEVNTSIZ_SIZE(evt->length));
 517	dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
 518
 519	return 0;
 520}
 521
 522void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
 523{
 524	struct dwc3_event_buffer	*evt;
 525
 526	evt = dwc->ev_buf;
 527
 528	evt->lpos = 0;
 529
 530	dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), 0);
 531	dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0), 0);
 532	dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), DWC3_GEVNTSIZ_INTMASK
 533			| DWC3_GEVNTSIZ_SIZE(0));
 534	dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
 535}
 536
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 537static void dwc3_core_num_eps(struct dwc3 *dwc)
 538{
 539	struct dwc3_hwparams	*parms = &dwc->hwparams;
 540
 541	dwc->num_eps = DWC3_NUM_EPS(parms);
 542}
 543
 544static void dwc3_cache_hwparams(struct dwc3 *dwc)
 545{
 546	struct dwc3_hwparams	*parms = &dwc->hwparams;
 547
 548	parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0);
 549	parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1);
 550	parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2);
 551	parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3);
 552	parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4);
 553	parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5);
 554	parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6);
 555	parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7);
 556	parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
 557
 558	if (DWC3_IP_IS(DWC32))
 559		parms->hwparams9 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS9);
 560}
 561
 562static int dwc3_core_ulpi_init(struct dwc3 *dwc)
 563{
 564	int intf;
 565	int ret = 0;
 566
 567	intf = DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3);
 568
 569	if (intf == DWC3_GHWPARAMS3_HSPHY_IFC_ULPI ||
 570	    (intf == DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI &&
 571	     dwc->hsphy_interface &&
 572	     !strncmp(dwc->hsphy_interface, "ulpi", 4)))
 573		ret = dwc3_ulpi_init(dwc);
 574
 575	return ret;
 576}
 577
 578/**
 579 * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core
 580 * @dwc: Pointer to our controller context structure
 581 *
 582 * Returns 0 on success. The USB PHY interfaces are configured but not
 583 * initialized. The PHY interfaces and the PHYs get initialized together with
 584 * the core in dwc3_core_init.
 585 */
 586static int dwc3_phy_setup(struct dwc3 *dwc)
 587{
 588	unsigned int hw_mode;
 589	u32 reg;
 590
 591	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
 592
 593	reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
 594
 595	/*
 596	 * Make sure UX_EXIT_PX is cleared as that causes issues with some
 597	 * PHYs. Also, this bit is not supposed to be used in normal operation.
 598	 */
 599	reg &= ~DWC3_GUSB3PIPECTL_UX_EXIT_PX;
 600
 601	/*
 602	 * Above 1.94a, it is recommended to set DWC3_GUSB3PIPECTL_SUSPHY
 603	 * to '0' during coreConsultant configuration. So default value
 604	 * will be '0' when the core is reset. Application needs to set it
 605	 * to '1' after the core initialization is completed.
 606	 */
 607	if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A))
 608		reg |= DWC3_GUSB3PIPECTL_SUSPHY;
 609
 610	/*
 611	 * For DRD controllers, GUSB3PIPECTL.SUSPENDENABLE must be cleared after
 612	 * power-on reset, and it can be set after core initialization, which is
 613	 * after device soft-reset during initialization.
 614	 */
 615	if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD)
 616		reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
 617
 618	if (dwc->u2ss_inp3_quirk)
 619		reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK;
 620
 621	if (dwc->dis_rxdet_inp3_quirk)
 622		reg |= DWC3_GUSB3PIPECTL_DISRXDETINP3;
 623
 624	if (dwc->req_p1p2p3_quirk)
 625		reg |= DWC3_GUSB3PIPECTL_REQP1P2P3;
 626
 627	if (dwc->del_p1p2p3_quirk)
 628		reg |= DWC3_GUSB3PIPECTL_DEP1P2P3_EN;
 629
 630	if (dwc->del_phy_power_chg_quirk)
 631		reg |= DWC3_GUSB3PIPECTL_DEPOCHANGE;
 632
 633	if (dwc->lfps_filter_quirk)
 634		reg |= DWC3_GUSB3PIPECTL_LFPSFILT;
 635
 636	if (dwc->rx_detect_poll_quirk)
 637		reg |= DWC3_GUSB3PIPECTL_RX_DETOPOLL;
 638
 639	if (dwc->tx_de_emphasis_quirk)
 640		reg |= DWC3_GUSB3PIPECTL_TX_DEEPH(dwc->tx_de_emphasis);
 641
 642	if (dwc->dis_u3_susphy_quirk)
 643		reg &= ~DWC3_GUSB3PIPECTL_SUSPHY;
 644
 645	if (dwc->dis_del_phy_power_chg_quirk)
 646		reg &= ~DWC3_GUSB3PIPECTL_DEPOCHANGE;
 647
 648	dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
 649
 650	reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
 651
 652	/* Select the HS PHY interface */
 653	switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) {
 654	case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI:
 655		if (dwc->hsphy_interface &&
 656				!strncmp(dwc->hsphy_interface, "utmi", 4)) {
 657			reg &= ~DWC3_GUSB2PHYCFG_ULPI_UTMI;
 658			break;
 659		} else if (dwc->hsphy_interface &&
 660				!strncmp(dwc->hsphy_interface, "ulpi", 4)) {
 661			reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI;
 662			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 663		} else {
 664			/* Relying on default value. */
 665			if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI))
 666				break;
 667		}
 668		fallthrough;
 669	case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
 670	default:
 671		break;
 672	}
 673
 674	switch (dwc->hsphy_mode) {
 675	case USBPHY_INTERFACE_MODE_UTMI:
 676		reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
 677		       DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
 678		reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_8_BIT) |
 679		       DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_8_BIT);
 680		break;
 681	case USBPHY_INTERFACE_MODE_UTMIW:
 682		reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
 683		       DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
 684		reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_16_BIT) |
 685		       DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_16_BIT);
 686		break;
 687	default:
 688		break;
 689	}
 690
 691	/*
 692	 * Above 1.94a, it is recommended to set DWC3_GUSB2PHYCFG_SUSPHY to
 693	 * '0' during coreConsultant configuration. So default value will
 694	 * be '0' when the core is reset. Application needs to set it to
 695	 * '1' after the core initialization is completed.
 696	 */
 697	if (!DWC3_VER_IS_WITHIN(DWC3, ANY, 194A))
 698		reg |= DWC3_GUSB2PHYCFG_SUSPHY;
 699
 700	/*
 701	 * For DRD controllers, GUSB2PHYCFG.SUSPHY must be cleared after
 702	 * power-on reset, and it can be set after core initialization, which is
 703	 * after device soft-reset during initialization.
 704	 */
 705	if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD)
 706		reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
 707
 708	if (dwc->dis_u2_susphy_quirk)
 709		reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
 710
 711	if (dwc->dis_enblslpm_quirk)
 712		reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
 713	else
 714		reg |= DWC3_GUSB2PHYCFG_ENBLSLPM;
 715
 716	if (dwc->dis_u2_freeclk_exists_quirk || dwc->gfladj_refclk_lpm_sel)
 717		reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
 718
 719	/*
 720	 * Some ULPI USB PHY does not support internal VBUS supply, to drive
 721	 * the CPEN pin requires the configuration of the ULPI DRVVBUSEXTERNAL
 722	 * bit of OTG_CTRL register. Controller configures the USB2 PHY
 723	 * ULPIEXTVBUSDRV bit[17] of the GUSB2PHYCFG register to drive vBus
 724	 * with an external supply.
 725	 */
 726	if (dwc->ulpi_ext_vbus_drv)
 727		reg |= DWC3_GUSB2PHYCFG_ULPIEXTVBUSDRV;
 728
 729	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
 730
 731	return 0;
 732}
 733
 734static int dwc3_phy_init(struct dwc3 *dwc)
 735{
 736	int ret;
 737
 738	usb_phy_init(dwc->usb2_phy);
 739	usb_phy_init(dwc->usb3_phy);
 740
 741	ret = phy_init(dwc->usb2_generic_phy);
 742	if (ret < 0)
 743		goto err_shutdown_usb3_phy;
 744
 745	ret = phy_init(dwc->usb3_generic_phy);
 746	if (ret < 0)
 747		goto err_exit_usb2_phy;
 748
 749	return 0;
 750
 751err_exit_usb2_phy:
 752	phy_exit(dwc->usb2_generic_phy);
 753err_shutdown_usb3_phy:
 754	usb_phy_shutdown(dwc->usb3_phy);
 755	usb_phy_shutdown(dwc->usb2_phy);
 756
 757	return ret;
 758}
 759
 760static void dwc3_phy_exit(struct dwc3 *dwc)
 761{
 762	phy_exit(dwc->usb3_generic_phy);
 763	phy_exit(dwc->usb2_generic_phy);
 764
 765	usb_phy_shutdown(dwc->usb3_phy);
 766	usb_phy_shutdown(dwc->usb2_phy);
 767}
 768
 769static int dwc3_phy_power_on(struct dwc3 *dwc)
 770{
 771	int ret;
 772
 773	usb_phy_set_suspend(dwc->usb2_phy, 0);
 774	usb_phy_set_suspend(dwc->usb3_phy, 0);
 775
 776	ret = phy_power_on(dwc->usb2_generic_phy);
 777	if (ret < 0)
 778		goto err_suspend_usb3_phy;
 779
 780	ret = phy_power_on(dwc->usb3_generic_phy);
 781	if (ret < 0)
 782		goto err_power_off_usb2_phy;
 783
 784	return 0;
 785
 786err_power_off_usb2_phy:
 787	phy_power_off(dwc->usb2_generic_phy);
 788err_suspend_usb3_phy:
 789	usb_phy_set_suspend(dwc->usb3_phy, 1);
 790	usb_phy_set_suspend(dwc->usb2_phy, 1);
 791
 792	return ret;
 793}
 794
 795static void dwc3_phy_power_off(struct dwc3 *dwc)
 796{
 797	phy_power_off(dwc->usb3_generic_phy);
 798	phy_power_off(dwc->usb2_generic_phy);
 799
 800	usb_phy_set_suspend(dwc->usb3_phy, 1);
 801	usb_phy_set_suspend(dwc->usb2_phy, 1);
 802}
 803
 804static int dwc3_clk_enable(struct dwc3 *dwc)
 805{
 806	int ret;
 807
 808	ret = clk_prepare_enable(dwc->bus_clk);
 809	if (ret)
 810		return ret;
 811
 812	ret = clk_prepare_enable(dwc->ref_clk);
 813	if (ret)
 814		goto disable_bus_clk;
 815
 816	ret = clk_prepare_enable(dwc->susp_clk);
 817	if (ret)
 818		goto disable_ref_clk;
 819
 820	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
 830disable_utmi_clk:
 831	clk_disable_unprepare(dwc->utmi_clk);
 832disable_susp_clk:
 833	clk_disable_unprepare(dwc->susp_clk);
 834disable_ref_clk:
 835	clk_disable_unprepare(dwc->ref_clk);
 836disable_bus_clk:
 837	clk_disable_unprepare(dwc->bus_clk);
 838	return ret;
 839}
 840
 841static 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
 850static 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
 859static 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
 879static 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
 948static int dwc3_core_get_phy(struct dwc3 *dwc);
 949static int dwc3_core_ulpi_init(struct dwc3 *dwc);
 950
 951/* set global incr burst type configuration registers */
 952static 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
1043static 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
1074static 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 */
1185static 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	/*
1334	 * Modify this for all supported Super Speed ports when
1335	 * multiport support is added.
1336	 */
1337	if (hw_mode != DWC3_GHWPARAMS0_MODE_GADGET &&
1338	    (DWC3_IP_IS(DWC31)) &&
1339	    dwc->maximum_speed == USB_SPEED_SUPER) {
1340		reg = dwc3_readl(dwc->regs, DWC3_LLUCTL);
1341		reg |= DWC3_LLUCTL_FORCE_GEN1;
1342		dwc3_writel(dwc->regs, DWC3_LLUCTL, reg);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1343	}
1344
1345	return 0;
1346
1347err_power_off_phy:
1348	dwc3_phy_power_off(dwc);
1349err_exit_phy:
1350	dwc3_phy_exit(dwc);
1351err_exit_ulpi:
 
 
 
 
 
 
 
 
 
 
 
 
1352	dwc3_ulpi_exit(dwc);
1353
 
1354	return ret;
1355}
1356
1357static int dwc3_core_get_phy(struct dwc3 *dwc)
1358{
1359	struct device		*dev = dwc->dev;
1360	struct device_node	*node = dev->of_node;
1361	int ret;
1362
1363	if (node) {
1364		dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
1365		dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
1366	} else {
1367		dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
1368		dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
1369	}
1370
1371	if (IS_ERR(dwc->usb2_phy)) {
1372		ret = PTR_ERR(dwc->usb2_phy);
1373		if (ret == -ENXIO || ret == -ENODEV)
1374			dwc->usb2_phy = NULL;
1375		else
1376			return dev_err_probe(dev, ret, "no usb2 phy configured\n");
 
1377	}
1378
1379	if (IS_ERR(dwc->usb3_phy)) {
1380		ret = PTR_ERR(dwc->usb3_phy);
1381		if (ret == -ENXIO || ret == -ENODEV)
1382			dwc->usb3_phy = NULL;
1383		else
1384			return dev_err_probe(dev, ret, "no usb3 phy configured\n");
 
1385	}
1386
1387	dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
1388	if (IS_ERR(dwc->usb2_generic_phy)) {
1389		ret = PTR_ERR(dwc->usb2_generic_phy);
1390		if (ret == -ENOSYS || ret == -ENODEV)
1391			dwc->usb2_generic_phy = NULL;
1392		else
1393			return dev_err_probe(dev, ret, "no usb2 phy configured\n");
 
1394	}
1395
1396	dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
1397	if (IS_ERR(dwc->usb3_generic_phy)) {
1398		ret = PTR_ERR(dwc->usb3_generic_phy);
1399		if (ret == -ENOSYS || ret == -ENODEV)
1400			dwc->usb3_generic_phy = NULL;
1401		else
1402			return dev_err_probe(dev, ret, "no usb3 phy configured\n");
 
1403	}
1404
1405	return 0;
1406}
1407
1408static int dwc3_core_init_mode(struct dwc3 *dwc)
1409{
1410	struct device *dev = dwc->dev;
1411	int ret;
1412
1413	switch (dwc->dr_mode) {
1414	case USB_DR_MODE_PERIPHERAL:
1415		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
1416
1417		if (dwc->usb2_phy)
1418			otg_set_vbus(dwc->usb2_phy->otg, false);
1419		phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
1420		phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
1421
1422		ret = dwc3_gadget_init(dwc);
1423		if (ret)
1424			return dev_err_probe(dev, ret, "failed to initialize gadget\n");
1425		break;
1426	case USB_DR_MODE_HOST:
1427		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
1428
1429		if (dwc->usb2_phy)
1430			otg_set_vbus(dwc->usb2_phy->otg, true);
1431		phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
1432		phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
1433
1434		ret = dwc3_host_init(dwc);
1435		if (ret)
1436			return dev_err_probe(dev, ret, "failed to initialize host\n");
1437		break;
1438	case USB_DR_MODE_OTG:
1439		INIT_WORK(&dwc->drd_work, __dwc3_set_mode);
1440		ret = dwc3_drd_init(dwc);
1441		if (ret)
1442			return dev_err_probe(dev, ret, "failed to initialize dual-role\n");
1443		break;
1444	default:
1445		dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode);
1446		return -EINVAL;
1447	}
1448
1449	return 0;
1450}
1451
1452static void dwc3_core_exit_mode(struct dwc3 *dwc)
1453{
1454	switch (dwc->dr_mode) {
1455	case USB_DR_MODE_PERIPHERAL:
1456		dwc3_gadget_exit(dwc);
1457		break;
1458	case USB_DR_MODE_HOST:
1459		dwc3_host_exit(dwc);
1460		break;
1461	case USB_DR_MODE_OTG:
1462		dwc3_drd_exit(dwc);
1463		break;
1464	default:
1465		/* do nothing */
1466		break;
1467	}
1468
1469	/* de-assert DRVVBUS for HOST and OTG mode */
1470	dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
1471}
1472
1473static void dwc3_get_properties(struct dwc3 *dwc)
1474{
1475	struct device		*dev = dwc->dev;
1476	u8			lpm_nyet_threshold;
1477	u8			tx_de_emphasis;
1478	u8			hird_threshold;
1479	u8			rx_thr_num_pkt = 0;
1480	u8			rx_max_burst = 0;
1481	u8			tx_thr_num_pkt = 0;
1482	u8			tx_max_burst = 0;
1483	u8			rx_thr_num_pkt_prd = 0;
1484	u8			rx_max_burst_prd = 0;
1485	u8			tx_thr_num_pkt_prd = 0;
1486	u8			tx_max_burst_prd = 0;
1487	u8			tx_fifo_resize_max_num;
1488	const char		*usb_psy_name;
1489	int			ret;
1490
1491	/* default to highest possible threshold */
1492	lpm_nyet_threshold = 0xf;
1493
1494	/* default to -3.5dB de-emphasis */
1495	tx_de_emphasis = 1;
1496
1497	/*
1498	 * default to assert utmi_sleep_n and use maximum allowed HIRD
1499	 * threshold value of 0b1100
1500	 */
1501	hird_threshold = 12;
1502
1503	/*
1504	 * default to a TXFIFO size large enough to fit 6 max packets.  This
1505	 * allows for systems with larger bus latencies to have some headroom
1506	 * for endpoints that have a large bMaxBurst value.
1507	 */
1508	tx_fifo_resize_max_num = 6;
1509
1510	dwc->maximum_speed = usb_get_maximum_speed(dev);
1511	dwc->max_ssp_rate = usb_get_maximum_ssp_rate(dev);
1512	dwc->dr_mode = usb_get_dr_mode(dev);
1513	dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node);
1514
1515	dwc->sysdev_is_parent = device_property_read_bool(dev,
1516				"linux,sysdev_is_parent");
1517	if (dwc->sysdev_is_parent)
1518		dwc->sysdev = dwc->dev->parent;
1519	else
1520		dwc->sysdev = dwc->dev;
1521
1522	ret = device_property_read_string(dev, "usb-psy-name", &usb_psy_name);
1523	if (ret >= 0) {
1524		dwc->usb_psy = power_supply_get_by_name(usb_psy_name);
1525		if (!dwc->usb_psy)
1526			dev_err(dev, "couldn't get usb power supply\n");
1527	}
1528
1529	dwc->has_lpm_erratum = device_property_read_bool(dev,
1530				"snps,has-lpm-erratum");
1531	device_property_read_u8(dev, "snps,lpm-nyet-threshold",
1532				&lpm_nyet_threshold);
1533	dwc->is_utmi_l1_suspend = device_property_read_bool(dev,
1534				"snps,is-utmi-l1-suspend");
1535	device_property_read_u8(dev, "snps,hird-threshold",
1536				&hird_threshold);
1537	dwc->dis_start_transfer_quirk = device_property_read_bool(dev,
1538				"snps,dis-start-transfer-quirk");
1539	dwc->usb3_lpm_capable = device_property_read_bool(dev,
1540				"snps,usb3_lpm_capable");
1541	dwc->usb2_lpm_disable = device_property_read_bool(dev,
1542				"snps,usb2-lpm-disable");
1543	dwc->usb2_gadget_lpm_disable = device_property_read_bool(dev,
1544				"snps,usb2-gadget-lpm-disable");
1545	device_property_read_u8(dev, "snps,rx-thr-num-pkt",
1546				&rx_thr_num_pkt);
1547	device_property_read_u8(dev, "snps,rx-max-burst",
1548				&rx_max_burst);
1549	device_property_read_u8(dev, "snps,tx-thr-num-pkt",
1550				&tx_thr_num_pkt);
1551	device_property_read_u8(dev, "snps,tx-max-burst",
1552				&tx_max_burst);
1553	device_property_read_u8(dev, "snps,rx-thr-num-pkt-prd",
1554				&rx_thr_num_pkt_prd);
1555	device_property_read_u8(dev, "snps,rx-max-burst-prd",
1556				&rx_max_burst_prd);
1557	device_property_read_u8(dev, "snps,tx-thr-num-pkt-prd",
1558				&tx_thr_num_pkt_prd);
1559	device_property_read_u8(dev, "snps,tx-max-burst-prd",
1560				&tx_max_burst_prd);
1561	dwc->do_fifo_resize = device_property_read_bool(dev,
1562							"tx-fifo-resize");
1563	if (dwc->do_fifo_resize)
1564		device_property_read_u8(dev, "tx-fifo-max-num",
1565					&tx_fifo_resize_max_num);
1566
1567	dwc->disable_scramble_quirk = device_property_read_bool(dev,
1568				"snps,disable_scramble_quirk");
1569	dwc->u2exit_lfps_quirk = device_property_read_bool(dev,
1570				"snps,u2exit_lfps_quirk");
1571	dwc->u2ss_inp3_quirk = device_property_read_bool(dev,
1572				"snps,u2ss_inp3_quirk");
1573	dwc->req_p1p2p3_quirk = device_property_read_bool(dev,
1574				"snps,req_p1p2p3_quirk");
1575	dwc->del_p1p2p3_quirk = device_property_read_bool(dev,
1576				"snps,del_p1p2p3_quirk");
1577	dwc->del_phy_power_chg_quirk = device_property_read_bool(dev,
1578				"snps,del_phy_power_chg_quirk");
1579	dwc->lfps_filter_quirk = device_property_read_bool(dev,
1580				"snps,lfps_filter_quirk");
1581	dwc->rx_detect_poll_quirk = device_property_read_bool(dev,
1582				"snps,rx_detect_poll_quirk");
1583	dwc->dis_u3_susphy_quirk = device_property_read_bool(dev,
1584				"snps,dis_u3_susphy_quirk");
1585	dwc->dis_u2_susphy_quirk = device_property_read_bool(dev,
1586				"snps,dis_u2_susphy_quirk");
1587	dwc->dis_enblslpm_quirk = device_property_read_bool(dev,
1588				"snps,dis_enblslpm_quirk");
1589	dwc->dis_u1_entry_quirk = device_property_read_bool(dev,
1590				"snps,dis-u1-entry-quirk");
1591	dwc->dis_u2_entry_quirk = device_property_read_bool(dev,
1592				"snps,dis-u2-entry-quirk");
1593	dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev,
1594				"snps,dis_rxdet_inp3_quirk");
1595	dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev,
1596				"snps,dis-u2-freeclk-exists-quirk");
1597	dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev,
1598				"snps,dis-del-phy-power-chg-quirk");
1599	dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev,
1600				"snps,dis-tx-ipgap-linecheck-quirk");
1601	dwc->resume_hs_terminations = device_property_read_bool(dev,
1602				"snps,resume-hs-terminations");
1603	dwc->ulpi_ext_vbus_drv = device_property_read_bool(dev,
1604				"snps,ulpi-ext-vbus-drv");
1605	dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev,
1606				"snps,parkmode-disable-ss-quirk");
1607	dwc->parkmode_disable_hs_quirk = device_property_read_bool(dev,
1608				"snps,parkmode-disable-hs-quirk");
1609	dwc->gfladj_refclk_lpm_sel = device_property_read_bool(dev,
1610				"snps,gfladj-refclk-lpm-sel-quirk");
1611
1612	dwc->tx_de_emphasis_quirk = device_property_read_bool(dev,
1613				"snps,tx_de_emphasis_quirk");
1614	device_property_read_u8(dev, "snps,tx_de_emphasis",
1615				&tx_de_emphasis);
1616	device_property_read_string(dev, "snps,hsphy_interface",
1617				    &dwc->hsphy_interface);
1618	device_property_read_u32(dev, "snps,quirk-frame-length-adjustment",
1619				 &dwc->fladj);
1620	device_property_read_u32(dev, "snps,ref-clock-period-ns",
1621				 &dwc->ref_clk_per);
1622
1623	dwc->dis_metastability_quirk = device_property_read_bool(dev,
1624				"snps,dis_metastability_quirk");
1625
1626	dwc->dis_split_quirk = device_property_read_bool(dev,
1627				"snps,dis-split-quirk");
1628
1629	dwc->lpm_nyet_threshold = lpm_nyet_threshold;
1630	dwc->tx_de_emphasis = tx_de_emphasis;
1631
1632	dwc->hird_threshold = hird_threshold;
1633
1634	dwc->rx_thr_num_pkt = rx_thr_num_pkt;
1635	dwc->rx_max_burst = rx_max_burst;
1636
1637	dwc->tx_thr_num_pkt = tx_thr_num_pkt;
1638	dwc->tx_max_burst = tx_max_burst;
1639
1640	dwc->rx_thr_num_pkt_prd = rx_thr_num_pkt_prd;
1641	dwc->rx_max_burst_prd = rx_max_burst_prd;
1642
1643	dwc->tx_thr_num_pkt_prd = tx_thr_num_pkt_prd;
1644	dwc->tx_max_burst_prd = tx_max_burst_prd;
1645
1646	dwc->imod_interval = 0;
1647
1648	dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num;
1649}
1650
1651/* check whether the core supports IMOD */
1652bool dwc3_has_imod(struct dwc3 *dwc)
1653{
1654	return DWC3_VER_IS_WITHIN(DWC3, 300A, ANY) ||
1655		DWC3_VER_IS_WITHIN(DWC31, 120A, ANY) ||
1656		DWC3_IP_IS(DWC32);
1657}
1658
1659static void dwc3_check_params(struct dwc3 *dwc)
1660{
1661	struct device *dev = dwc->dev;
1662	unsigned int hwparam_gen =
1663		DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3);
1664
1665	/* Check for proper value of imod_interval */
1666	if (dwc->imod_interval && !dwc3_has_imod(dwc)) {
1667		dev_warn(dwc->dev, "Interrupt moderation not supported\n");
1668		dwc->imod_interval = 0;
1669	}
1670
1671	/*
1672	 * Workaround for STAR 9000961433 which affects only version
1673	 * 3.00a of the DWC_usb3 core. This prevents the controller
1674	 * interrupt from being masked while handling events. IMOD
1675	 * allows us to work around this issue. Enable it for the
1676	 * affected version.
1677	 */
1678	if (!dwc->imod_interval &&
1679	    DWC3_VER_IS(DWC3, 300A))
1680		dwc->imod_interval = 1;
1681
1682	/* Check the maximum_speed parameter */
1683	switch (dwc->maximum_speed) {
1684	case USB_SPEED_FULL:
1685	case USB_SPEED_HIGH:
1686		break;
1687	case USB_SPEED_SUPER:
1688		if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS)
1689			dev_warn(dev, "UDC doesn't support Gen 1\n");
1690		break;
1691	case USB_SPEED_SUPER_PLUS:
1692		if ((DWC3_IP_IS(DWC32) &&
1693		     hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_DIS) ||
1694		    (!DWC3_IP_IS(DWC32) &&
1695		     hwparam_gen != DWC3_GHWPARAMS3_SSPHY_IFC_GEN2))
1696			dev_warn(dev, "UDC doesn't support SSP\n");
1697		break;
1698	default:
1699		dev_err(dev, "invalid maximum_speed parameter %d\n",
1700			dwc->maximum_speed);
1701		fallthrough;
1702	case USB_SPEED_UNKNOWN:
1703		switch (hwparam_gen) {
1704		case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2:
1705			dwc->maximum_speed = USB_SPEED_SUPER_PLUS;
1706			break;
1707		case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1:
1708			if (DWC3_IP_IS(DWC32))
1709				dwc->maximum_speed = USB_SPEED_SUPER_PLUS;
1710			else
1711				dwc->maximum_speed = USB_SPEED_SUPER;
1712			break;
1713		case DWC3_GHWPARAMS3_SSPHY_IFC_DIS:
1714			dwc->maximum_speed = USB_SPEED_HIGH;
1715			break;
1716		default:
1717			dwc->maximum_speed = USB_SPEED_SUPER;
1718			break;
1719		}
1720		break;
1721	}
1722
1723	/*
1724	 * Currently the controller does not have visibility into the HW
1725	 * parameter to determine the maximum number of lanes the HW supports.
1726	 * If the number of lanes is not specified in the device property, then
1727	 * set the default to support dual-lane for DWC_usb32 and single-lane
1728	 * for DWC_usb31 for super-speed-plus.
1729	 */
1730	if (dwc->maximum_speed == USB_SPEED_SUPER_PLUS) {
1731		switch (dwc->max_ssp_rate) {
1732		case USB_SSP_GEN_2x1:
1733			if (hwparam_gen == DWC3_GHWPARAMS3_SSPHY_IFC_GEN1)
1734				dev_warn(dev, "UDC only supports Gen 1\n");
1735			break;
1736		case USB_SSP_GEN_1x2:
1737		case USB_SSP_GEN_2x2:
1738			if (DWC3_IP_IS(DWC31))
1739				dev_warn(dev, "UDC only supports single lane\n");
1740			break;
1741		case USB_SSP_GEN_UNKNOWN:
1742		default:
1743			switch (hwparam_gen) {
1744			case DWC3_GHWPARAMS3_SSPHY_IFC_GEN2:
1745				if (DWC3_IP_IS(DWC32))
1746					dwc->max_ssp_rate = USB_SSP_GEN_2x2;
1747				else
1748					dwc->max_ssp_rate = USB_SSP_GEN_2x1;
1749				break;
1750			case DWC3_GHWPARAMS3_SSPHY_IFC_GEN1:
1751				if (DWC3_IP_IS(DWC32))
1752					dwc->max_ssp_rate = USB_SSP_GEN_1x2;
1753				break;
1754			}
1755			break;
1756		}
1757	}
1758}
1759
1760static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
1761{
1762	struct device *dev = dwc->dev;
1763	struct device_node *np_phy;
1764	struct extcon_dev *edev = NULL;
1765	const char *name;
1766
1767	if (device_property_read_bool(dev, "extcon"))
1768		return extcon_get_edev_by_phandle(dev, 0);
1769
1770	/*
1771	 * Device tree platforms should get extcon via phandle.
1772	 * On ACPI platforms, we get the name from a device property.
1773	 * This device property is for kernel internal use only and
1774	 * is expected to be set by the glue code.
1775	 */
1776	if (device_property_read_string(dev, "linux,extcon-name", &name) == 0)
1777		return extcon_get_extcon_dev(name);
1778
1779	/*
1780	 * Check explicitly if "usb-role-switch" is used since
1781	 * extcon_find_edev_by_node() can not be used to check the absence of
1782	 * an extcon device. In the absence of an device it will always return
1783	 * EPROBE_DEFER.
1784	 */
1785	if (IS_ENABLED(CONFIG_USB_ROLE_SWITCH) &&
1786	    device_property_read_bool(dev, "usb-role-switch"))
1787		return NULL;
1788
1789	/*
1790	 * Try to get an extcon device from the USB PHY controller's "port"
1791	 * node. Check if it has the "port" node first, to avoid printing the
1792	 * error message from underlying code, as it's a valid case: extcon
1793	 * device (and "port" node) may be missing in case of "usb-role-switch"
1794	 * or OTG mode.
1795	 */
1796	np_phy = of_parse_phandle(dev->of_node, "phys", 0);
1797	if (of_graph_is_present(np_phy)) {
1798		struct device_node *np_conn;
1799
1800		np_conn = of_graph_get_remote_node(np_phy, -1, -1);
1801		if (np_conn)
1802			edev = extcon_find_edev_by_node(np_conn);
1803		of_node_put(np_conn);
1804	}
1805	of_node_put(np_phy);
1806
1807	return edev;
1808}
1809
1810static int dwc3_get_clocks(struct dwc3 *dwc)
1811{
1812	struct device *dev = dwc->dev;
1813
1814	if (!dev->of_node)
1815		return 0;
1816
1817	/*
1818	 * Clocks are optional, but new DT platforms should support all clocks
1819	 * as required by the DT-binding.
1820	 * Some devices have different clock names in legacy device trees,
1821	 * check for them to retain backwards compatibility.
1822	 */
1823	dwc->bus_clk = devm_clk_get_optional(dev, "bus_early");
1824	if (IS_ERR(dwc->bus_clk)) {
1825		return dev_err_probe(dev, PTR_ERR(dwc->bus_clk),
1826				"could not get bus clock\n");
1827	}
1828
1829	if (dwc->bus_clk == NULL) {
1830		dwc->bus_clk = devm_clk_get_optional(dev, "bus_clk");
1831		if (IS_ERR(dwc->bus_clk)) {
1832			return dev_err_probe(dev, PTR_ERR(dwc->bus_clk),
1833					"could not get bus clock\n");
1834		}
1835	}
1836
1837	dwc->ref_clk = devm_clk_get_optional(dev, "ref");
1838	if (IS_ERR(dwc->ref_clk)) {
1839		return dev_err_probe(dev, PTR_ERR(dwc->ref_clk),
1840				"could not get ref clock\n");
1841	}
1842
1843	if (dwc->ref_clk == NULL) {
1844		dwc->ref_clk = devm_clk_get_optional(dev, "ref_clk");
1845		if (IS_ERR(dwc->ref_clk)) {
1846			return dev_err_probe(dev, PTR_ERR(dwc->ref_clk),
1847					"could not get ref clock\n");
1848		}
1849	}
1850
1851	dwc->susp_clk = devm_clk_get_optional(dev, "suspend");
1852	if (IS_ERR(dwc->susp_clk)) {
1853		return dev_err_probe(dev, PTR_ERR(dwc->susp_clk),
1854				"could not get suspend clock\n");
1855	}
1856
1857	if (dwc->susp_clk == NULL) {
1858		dwc->susp_clk = devm_clk_get_optional(dev, "suspend_clk");
1859		if (IS_ERR(dwc->susp_clk)) {
1860			return dev_err_probe(dev, PTR_ERR(dwc->susp_clk),
1861					"could not get suspend clock\n");
1862		}
1863	}
1864
1865	/* specific to Rockchip RK3588 */
1866	dwc->utmi_clk = devm_clk_get_optional(dev, "utmi");
1867	if (IS_ERR(dwc->utmi_clk)) {
1868		return dev_err_probe(dev, PTR_ERR(dwc->utmi_clk),
1869				"could not get utmi clock\n");
1870	}
1871
1872	/* specific to Rockchip RK3588 */
1873	dwc->pipe_clk = devm_clk_get_optional(dev, "pipe");
1874	if (IS_ERR(dwc->pipe_clk)) {
1875		return dev_err_probe(dev, PTR_ERR(dwc->pipe_clk),
1876				"could not get pipe clock\n");
1877	}
1878
1879	return 0;
1880}
1881
1882static int dwc3_probe(struct platform_device *pdev)
1883{
1884	struct device		*dev = &pdev->dev;
1885	struct resource		*res, dwc_res;
1886	void __iomem		*regs;
1887	struct dwc3		*dwc;
 
1888	int			ret;
1889
 
 
1890	dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
1891	if (!dwc)
1892		return -ENOMEM;
1893
1894	dwc->dev = dev;
1895
1896	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1897	if (!res) {
1898		dev_err(dev, "missing memory resource\n");
1899		return -ENODEV;
1900	}
1901
1902	dwc->xhci_resources[0].start = res->start;
1903	dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
1904					DWC3_XHCI_REGS_END;
1905	dwc->xhci_resources[0].flags = res->flags;
1906	dwc->xhci_resources[0].name = res->name;
1907
1908	/*
1909	 * Request memory region but exclude xHCI regs,
1910	 * since it will be requested by the xhci-plat driver.
1911	 */
1912	dwc_res = *res;
1913	dwc_res.start += DWC3_GLOBALS_REGS_START;
1914
1915	if (dev->of_node) {
1916		struct device_node *parent = of_get_parent(dev->of_node);
1917
1918		if (of_device_is_compatible(parent, "realtek,rtd-dwc3")) {
1919			dwc_res.start -= DWC3_GLOBALS_REGS_START;
1920			dwc_res.start += DWC3_RTK_RTD_GLOBALS_REGS_START;
1921		}
1922
1923		of_node_put(parent);
1924	}
1925
1926	regs = devm_ioremap_resource(dev, &dwc_res);
1927	if (IS_ERR(regs))
1928		return PTR_ERR(regs);
1929
1930	dwc->regs	= regs;
1931	dwc->regs_size	= resource_size(&dwc_res);
1932
1933	dwc3_get_properties(dwc);
1934
 
 
 
 
1935	dwc->reset = devm_reset_control_array_get_optional_shared(dev);
1936	if (IS_ERR(dwc->reset)) {
1937		ret = PTR_ERR(dwc->reset);
1938		goto err_put_psy;
1939	}
1940
1941	ret = dwc3_get_clocks(dwc);
1942	if (ret)
1943		goto err_put_psy;
 
 
 
 
 
 
 
 
 
 
 
1944
1945	ret = reset_control_deassert(dwc->reset);
1946	if (ret)
1947		goto err_put_psy;
1948
1949	ret = dwc3_clk_enable(dwc);
1950	if (ret)
1951		goto err_assert_reset;
1952
1953	if (!dwc3_core_is_valid(dwc)) {
1954		dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
1955		ret = -ENODEV;
1956		goto err_disable_clks;
1957	}
1958
1959	platform_set_drvdata(pdev, dwc);
1960	dwc3_cache_hwparams(dwc);
1961
1962	if (!dwc->sysdev_is_parent &&
1963	    DWC3_GHWPARAMS0_AWIDTH(dwc->hwparams.hwparams0) == 64) {
1964		ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64));
1965		if (ret)
1966			goto err_disable_clks;
1967	}
1968
1969	spin_lock_init(&dwc->lock);
1970	mutex_init(&dwc->mutex);
1971
1972	pm_runtime_get_noresume(dev);
1973	pm_runtime_set_active(dev);
1974	pm_runtime_use_autosuspend(dev);
1975	pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);
1976	pm_runtime_enable(dev);
 
 
 
1977
1978	pm_runtime_forbid(dev);
1979
1980	ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
1981	if (ret) {
1982		dev_err(dwc->dev, "failed to allocate event buffers\n");
1983		ret = -ENOMEM;
1984		goto err_allow_rpm;
1985	}
1986
1987	dwc->edev = dwc3_get_extcon(dwc);
1988	if (IS_ERR(dwc->edev)) {
1989		ret = dev_err_probe(dwc->dev, PTR_ERR(dwc->edev), "failed to get extcon\n");
1990		goto err_free_event_buffers;
1991	}
1992
1993	ret = dwc3_get_dr_mode(dwc);
1994	if (ret)
1995		goto err_free_event_buffers;
 
 
 
 
1996
1997	ret = dwc3_core_init(dwc);
1998	if (ret) {
1999		dev_err_probe(dev, ret, "failed to initialize core\n");
2000		goto err_free_event_buffers;
2001	}
2002
2003	dwc3_check_params(dwc);
2004	dwc3_debugfs_init(dwc);
2005
2006	ret = dwc3_core_init_mode(dwc);
2007	if (ret)
2008		goto err_exit_debugfs;
2009
2010	pm_runtime_put(dev);
2011
2012	dma_set_max_seg_size(dev, UINT_MAX);
2013
2014	return 0;
2015
2016err_exit_debugfs:
2017	dwc3_debugfs_exit(dwc);
2018	dwc3_event_buffers_cleanup(dwc);
2019	dwc3_phy_power_off(dwc);
2020	dwc3_phy_exit(dwc);
 
 
 
 
 
 
 
 
 
2021	dwc3_ulpi_exit(dwc);
2022err_free_event_buffers:
 
 
 
 
2023	dwc3_free_event_buffers(dwc);
2024err_allow_rpm:
2025	pm_runtime_allow(dev);
2026	pm_runtime_disable(dev);
2027	pm_runtime_dont_use_autosuspend(dev);
2028	pm_runtime_set_suspended(dev);
2029	pm_runtime_put_noidle(dev);
2030err_disable_clks:
2031	dwc3_clk_disable(dwc);
2032err_assert_reset:
 
 
2033	reset_control_assert(dwc->reset);
2034err_put_psy:
2035	if (dwc->usb_psy)
2036		power_supply_put(dwc->usb_psy);
2037
2038	return ret;
2039}
2040
2041static void dwc3_remove(struct platform_device *pdev)
2042{
2043	struct dwc3	*dwc = platform_get_drvdata(pdev);
2044
2045	pm_runtime_get_sync(&pdev->dev);
2046
2047	dwc3_core_exit_mode(dwc);
2048	dwc3_debugfs_exit(dwc);
2049
2050	dwc3_core_exit(dwc);
2051	dwc3_ulpi_exit(dwc);
2052
2053	pm_runtime_allow(&pdev->dev);
2054	pm_runtime_disable(&pdev->dev);
2055	pm_runtime_dont_use_autosuspend(&pdev->dev);
2056	pm_runtime_put_noidle(&pdev->dev);
2057	/*
2058	 * HACK: Clear the driver data, which is currently accessed by parent
2059	 * glue drivers, before allowing the parent to suspend.
2060	 */
2061	platform_set_drvdata(pdev, NULL);
2062	pm_runtime_set_suspended(&pdev->dev);
2063
2064	dwc3_free_event_buffers(dwc);
 
2065
2066	if (dwc->usb_psy)
2067		power_supply_put(dwc->usb_psy);
 
 
2068}
2069
2070#ifdef CONFIG_PM
2071static int dwc3_core_init_for_resume(struct dwc3 *dwc)
2072{
2073	int ret;
2074
2075	ret = reset_control_deassert(dwc->reset);
2076	if (ret)
2077		return ret;
2078
2079	ret = dwc3_clk_enable(dwc);
2080	if (ret)
2081		goto assert_reset;
2082
2083	ret = dwc3_core_init(dwc);
2084	if (ret)
2085		goto disable_clks;
2086
2087	return 0;
2088
2089disable_clks:
2090	dwc3_clk_disable(dwc);
2091assert_reset:
2092	reset_control_assert(dwc->reset);
2093
2094	return ret;
2095}
2096
2097static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
2098{
2099	unsigned long	flags;
2100	u32 reg;
2101
2102	switch (dwc->current_dr_role) {
2103	case DWC3_GCTL_PRTCAP_DEVICE:
2104		if (pm_runtime_suspended(dwc->dev))
2105			break;
 
2106		dwc3_gadget_suspend(dwc);
 
2107		synchronize_irq(dwc->irq_gadget);
2108		dwc3_core_exit(dwc);
2109		break;
2110	case DWC3_GCTL_PRTCAP_HOST:
2111		if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) {
2112			dwc3_core_exit(dwc);
2113			break;
2114		}
2115
2116		/* Let controller to suspend HSPHY before PHY driver suspends */
2117		if (dwc->dis_u2_susphy_quirk ||
2118		    dwc->dis_enblslpm_quirk) {
2119			reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
2120			reg |=  DWC3_GUSB2PHYCFG_ENBLSLPM |
2121				DWC3_GUSB2PHYCFG_SUSPHY;
2122			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
2123
2124			/* Give some time for USB2 PHY to suspend */
2125			usleep_range(5000, 6000);
2126		}
2127
2128		phy_pm_runtime_put_sync(dwc->usb2_generic_phy);
2129		phy_pm_runtime_put_sync(dwc->usb3_generic_phy);
2130		break;
2131	case DWC3_GCTL_PRTCAP_OTG:
2132		/* do nothing during runtime_suspend */
2133		if (PMSG_IS_AUTO(msg))
2134			break;
2135
2136		if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
2137			spin_lock_irqsave(&dwc->lock, flags);
2138			dwc3_gadget_suspend(dwc);
2139			spin_unlock_irqrestore(&dwc->lock, flags);
2140			synchronize_irq(dwc->irq_gadget);
2141		}
2142
2143		dwc3_otg_exit(dwc);
2144		dwc3_core_exit(dwc);
2145		break;
2146	default:
2147		/* do nothing */
2148		break;
2149	}
2150
2151	return 0;
2152}
2153
2154static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
2155{
2156	unsigned long	flags;
2157	int		ret;
2158	u32		reg;
2159
2160	switch (dwc->current_dr_role) {
2161	case DWC3_GCTL_PRTCAP_DEVICE:
2162		ret = dwc3_core_init_for_resume(dwc);
2163		if (ret)
2164			return ret;
2165
2166		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
 
2167		dwc3_gadget_resume(dwc);
 
2168		break;
2169	case DWC3_GCTL_PRTCAP_HOST:
2170		if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) {
2171			ret = dwc3_core_init_for_resume(dwc);
2172			if (ret)
2173				return ret;
2174			dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
2175			break;
2176		}
2177		/* Restore GUSB2PHYCFG bits that were modified in suspend */
2178		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
2179		if (dwc->dis_u2_susphy_quirk)
2180			reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
2181
2182		if (dwc->dis_enblslpm_quirk)
2183			reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
2184
2185		dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
2186
2187		phy_pm_runtime_get_sync(dwc->usb2_generic_phy);
2188		phy_pm_runtime_get_sync(dwc->usb3_generic_phy);
2189		break;
2190	case DWC3_GCTL_PRTCAP_OTG:
2191		/* nothing to do on runtime_resume */
2192		if (PMSG_IS_AUTO(msg))
2193			break;
2194
2195		ret = dwc3_core_init_for_resume(dwc);
2196		if (ret)
2197			return ret;
2198
2199		dwc3_set_prtcap(dwc, dwc->current_dr_role);
2200
2201		dwc3_otg_init(dwc);
2202		if (dwc->current_otg_role == DWC3_OTG_ROLE_HOST) {
2203			dwc3_otg_host_init(dwc);
2204		} else if (dwc->current_otg_role == DWC3_OTG_ROLE_DEVICE) {
2205			spin_lock_irqsave(&dwc->lock, flags);
2206			dwc3_gadget_resume(dwc);
2207			spin_unlock_irqrestore(&dwc->lock, flags);
2208		}
2209
2210		break;
2211	default:
2212		/* do nothing */
2213		break;
2214	}
2215
2216	return 0;
2217}
2218
2219static int dwc3_runtime_checks(struct dwc3 *dwc)
2220{
2221	switch (dwc->current_dr_role) {
2222	case DWC3_GCTL_PRTCAP_DEVICE:
2223		if (dwc->connected)
2224			return -EBUSY;
2225		break;
2226	case DWC3_GCTL_PRTCAP_HOST:
2227	default:
2228		/* do nothing */
2229		break;
2230	}
2231
2232	return 0;
2233}
2234
2235static int dwc3_runtime_suspend(struct device *dev)
2236{
2237	struct dwc3     *dwc = dev_get_drvdata(dev);
2238	int		ret;
2239
2240	if (dwc3_runtime_checks(dwc))
2241		return -EBUSY;
2242
2243	ret = dwc3_suspend_common(dwc, PMSG_AUTO_SUSPEND);
2244	if (ret)
2245		return ret;
2246
 
 
2247	return 0;
2248}
2249
2250static int dwc3_runtime_resume(struct device *dev)
2251{
2252	struct dwc3     *dwc = dev_get_drvdata(dev);
2253	int		ret;
2254
 
 
2255	ret = dwc3_resume_common(dwc, PMSG_AUTO_RESUME);
2256	if (ret)
2257		return ret;
2258
2259	switch (dwc->current_dr_role) {
2260	case DWC3_GCTL_PRTCAP_DEVICE:
2261		dwc3_gadget_process_pending_events(dwc);
2262		break;
2263	case DWC3_GCTL_PRTCAP_HOST:
2264	default:
2265		/* do nothing */
2266		break;
2267	}
2268
2269	pm_runtime_mark_last_busy(dev);
2270
2271	return 0;
2272}
2273
2274static int dwc3_runtime_idle(struct device *dev)
2275{
2276	struct dwc3     *dwc = dev_get_drvdata(dev);
2277
2278	switch (dwc->current_dr_role) {
2279	case DWC3_GCTL_PRTCAP_DEVICE:
2280		if (dwc3_runtime_checks(dwc))
2281			return -EBUSY;
2282		break;
2283	case DWC3_GCTL_PRTCAP_HOST:
2284	default:
2285		/* do nothing */
2286		break;
2287	}
2288
2289	pm_runtime_mark_last_busy(dev);
2290	pm_runtime_autosuspend(dev);
2291
2292	return 0;
2293}
2294#endif /* CONFIG_PM */
2295
2296#ifdef CONFIG_PM_SLEEP
2297static int dwc3_suspend(struct device *dev)
2298{
2299	struct dwc3	*dwc = dev_get_drvdata(dev);
2300	int		ret;
2301
2302	ret = dwc3_suspend_common(dwc, PMSG_SUSPEND);
2303	if (ret)
2304		return ret;
2305
2306	pinctrl_pm_select_sleep_state(dev);
2307
2308	return 0;
2309}
2310
2311static int dwc3_resume(struct device *dev)
2312{
2313	struct dwc3	*dwc = dev_get_drvdata(dev);
2314	int		ret;
2315
2316	pinctrl_pm_select_default_state(dev);
2317
2318	pm_runtime_disable(dev);
2319	pm_runtime_set_active(dev);
2320
2321	ret = dwc3_resume_common(dwc, PMSG_RESUME);
2322	if (ret) {
2323		pm_runtime_set_suspended(dev);
2324		return ret;
2325	}
2326
 
 
2327	pm_runtime_enable(dev);
2328
2329	return 0;
2330}
2331
2332static void dwc3_complete(struct device *dev)
2333{
2334	struct dwc3	*dwc = dev_get_drvdata(dev);
2335	u32		reg;
2336
2337	if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST &&
2338			dwc->dis_split_quirk) {
2339		reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
2340		reg |= DWC3_GUCTL3_SPLITDISABLE;
2341		dwc3_writel(dwc->regs, DWC3_GUCTL3, reg);
2342	}
2343}
2344#else
2345#define dwc3_complete NULL
2346#endif /* CONFIG_PM_SLEEP */
2347
2348static const struct dev_pm_ops dwc3_dev_pm_ops = {
2349	SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
2350	.complete = dwc3_complete,
2351	SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume,
2352			dwc3_runtime_idle)
2353};
2354
2355#ifdef CONFIG_OF
2356static const struct of_device_id of_dwc3_match[] = {
2357	{
2358		.compatible = "snps,dwc3"
2359	},
2360	{
2361		.compatible = "synopsys,dwc3"
2362	},
2363	{ },
2364};
2365MODULE_DEVICE_TABLE(of, of_dwc3_match);
2366#endif
2367
2368#ifdef CONFIG_ACPI
2369
2370#define ACPI_ID_INTEL_BSW	"808622B7"
2371
2372static const struct acpi_device_id dwc3_acpi_match[] = {
2373	{ ACPI_ID_INTEL_BSW, 0 },
2374	{ },
2375};
2376MODULE_DEVICE_TABLE(acpi, dwc3_acpi_match);
2377#endif
2378
2379static struct platform_driver dwc3_driver = {
2380	.probe		= dwc3_probe,
2381	.remove_new	= dwc3_remove,
2382	.driver		= {
2383		.name	= "dwc3",
2384		.of_match_table	= of_match_ptr(of_dwc3_match),
2385		.acpi_match_table = ACPI_PTR(dwc3_acpi_match),
2386		.pm	= &dwc3_dev_pm_ops,
2387	},
2388};
2389
2390module_platform_driver(dwc3_driver);
2391
2392MODULE_ALIAS("platform:dwc3");
2393MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
2394MODULE_LICENSE("GPL v2");
2395MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver");