1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2001-2004 by David Brownell
   4 */
   5
   6/* this file is part of ehci-hcd.c */
   7
   8/*-------------------------------------------------------------------------*/
   9
  10/*
  11 * EHCI Root Hub ... the nonsharable stuff
  12 *
  13 * Registers don't need cpu_to_le32, that happens transparently
  14 */
  15
  16/*-------------------------------------------------------------------------*/
 
  17
  18#define	PORT_WAKE_BITS	(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
  19
  20#ifdef	CONFIG_PM
  21
  22static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
  23
  24static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
  25{
  26	return !udev->maxchild && udev->persist_enabled &&
  27		udev->bus->root_hub->speed < USB_SPEED_HIGH;
  28}
  29
  30/* After a power loss, ports that were owned by the companion must be
  31 * reset so that the companion can still own them.
  32 */
  33static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
  34{
  35	u32 __iomem	*reg;
  36	u32		status;
  37	int		port;
  38	__le32		buf;
  39	struct usb_hcd	*hcd = ehci_to_hcd(ehci);
  40
  41	if (!ehci->owned_ports)
  42		return;
  43
  44	/*
  45	 * USB 1.1 devices are mostly HIDs, which don't need to persist across
  46	 * suspends. If we ensure that none of our companion's devices have
  47	 * persist_enabled (by looking through all USB 1.1 buses in the system),
  48	 * we can skip this and avoid slowing resume down. Devices without
  49	 * persist will just get reenumerated shortly after resume anyway.
  50	 */
  51	if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
  52		return;
  53
  54	/* Make sure the ports are powered */
  55	port = HCS_N_PORTS(ehci->hcs_params);
  56	while (port--) {
  57		if (test_bit(port, &ehci->owned_ports)) {
  58			reg = &ehci->regs->port_status[port];
  59			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  60			if (!(status & PORT_POWER))
  61				ehci_port_power(ehci, port, true);
  62		}
  63	}
  64
  65	/* Give the connections some time to appear */
  66	msleep(20);
  67
  68	spin_lock_irq(&ehci->lock);
  69	port = HCS_N_PORTS(ehci->hcs_params);
  70	while (port--) {
  71		if (test_bit(port, &ehci->owned_ports)) {
  72			reg = &ehci->regs->port_status[port];
  73			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
  74
  75			/* Port already owned by companion? */
  76			if (status & PORT_OWNER)
  77				clear_bit(port, &ehci->owned_ports);
  78			else if (test_bit(port, &ehci->companion_ports))
  79				ehci_writel(ehci, status & ~PORT_PE, reg);
  80			else {
  81				spin_unlock_irq(&ehci->lock);
  82				ehci_hub_control(hcd, SetPortFeature,
  83						USB_PORT_FEAT_RESET, port + 1,
  84						NULL, 0);
  85				spin_lock_irq(&ehci->lock);
  86			}
  87		}
  88	}
  89	spin_unlock_irq(&ehci->lock);
  90
  91	if (!ehci->owned_ports)
  92		return;
  93	msleep(90);		/* Wait for resets to complete */
  94
  95	spin_lock_irq(&ehci->lock);
  96	port = HCS_N_PORTS(ehci->hcs_params);
  97	while (port--) {
  98		if (test_bit(port, &ehci->owned_ports)) {
  99			spin_unlock_irq(&ehci->lock);
 100			ehci_hub_control(hcd, GetPortStatus,
 101					0, port + 1,
 102					(char *) &buf, sizeof(buf));
 103			spin_lock_irq(&ehci->lock);
 104
 105			/* The companion should now own the port,
 106			 * but if something went wrong the port must not
 107			 * remain enabled.
 108			 */
 109			reg = &ehci->regs->port_status[port];
 110			status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 111			if (status & PORT_OWNER)
 112				ehci_writel(ehci, status | PORT_CSC, reg);
 113			else {
 114				ehci_dbg(ehci, "failed handover port %d: %x\n",
 115						port + 1, status);
 116				ehci_writel(ehci, status & ~PORT_PE, reg);
 117			}
 118		}
 119	}
 120
 121	ehci->owned_ports = 0;
 122	spin_unlock_irq(&ehci->lock);
 123}
 124
 125static int ehci_port_change(struct ehci_hcd *ehci)
 126{
 127	int i = HCS_N_PORTS(ehci->hcs_params);
 128
 129	/* First check if the controller indicates a change event */
 130
 131	if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
 132		return 1;
 133
 134	/*
 135	 * Not all controllers appear to update this while going from D3 to D0,
 136	 * so check the individual port status registers as well
 137	 */
 138
 139	while (i--)
 140		if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
 141			return 1;
 142
 143	return 0;
 144}
 145
 146void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
 147		bool suspending, bool do_wakeup)
 148{
 149	int		port;
 150	u32		temp;
 151
 152	/* If remote wakeup is enabled for the root hub but disabled
 153	 * for the controller, we must adjust all the port wakeup flags
 154	 * when the controller is suspended or resumed.  In all other
 155	 * cases they don't need to be changed.
 156	 */
 157	if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
 158		return;
 159
 160	spin_lock_irq(&ehci->lock);
 161
 162	/* clear phy low-power mode before changing wakeup flags */
 163	if (ehci->has_tdi_phy_lpm) {
 164		port = HCS_N_PORTS(ehci->hcs_params);
 165		while (port--) {
 166			u32 __iomem	*hostpc_reg = &ehci->regs->hostpc[port];
 167
 168			temp = ehci_readl(ehci, hostpc_reg);
 169			ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
 170		}
 171		spin_unlock_irq(&ehci->lock);
 172		msleep(5);
 173		spin_lock_irq(&ehci->lock);
 174	}
 175
 176	port = HCS_N_PORTS(ehci->hcs_params);
 177	while (port--) {
 178		u32 __iomem	*reg = &ehci->regs->port_status[port];
 179		u32		t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 180		u32		t2 = t1 & ~PORT_WAKE_BITS;
 181
 182		/* If we are suspending the controller, clear the flags.
 183		 * If we are resuming the controller, set the wakeup flags.
 184		 */
 185		if (!suspending) {
 186			if (t1 & PORT_CONNECT)
 187				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 188			else
 189				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 190		}
 191		ehci_writel(ehci, t2, reg);
 192	}
 193
 194	/* enter phy low-power mode again */
 195	if (ehci->has_tdi_phy_lpm) {
 196		port = HCS_N_PORTS(ehci->hcs_params);
 197		while (port--) {
 198			u32 __iomem	*hostpc_reg = &ehci->regs->hostpc[port];
 199
 200			temp = ehci_readl(ehci, hostpc_reg);
 201			ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
 202		}
 203	}
 204
 205	/* Does the root hub have a port wakeup pending? */
 206	if (!suspending && ehci_port_change(ehci))
 207		usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 208
 209	spin_unlock_irq(&ehci->lock);
 210}
 211EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
 212
 213static int ehci_bus_suspend (struct usb_hcd *hcd)
 214{
 215	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
 216	int			port;
 217	int			mask;
 218	int			changed;
 219	bool			fs_idle_delay;
 220
 221	ehci_dbg(ehci, "suspend root hub\n");
 222
 223	if (time_before (jiffies, ehci->next_statechange))
 224		msleep(5);
 225
 226	/* stop the schedules */
 227	ehci_quiesce(ehci);
 228
 229	spin_lock_irq (&ehci->lock);
 230	if (ehci->rh_state < EHCI_RH_RUNNING)
 231		goto done;
 232
 233	/* Once the controller is stopped, port resumes that are already
 234	 * in progress won't complete.  Hence if remote wakeup is enabled
 235	 * for the root hub and any ports are in the middle of a resume or
 236	 * remote wakeup, we must fail the suspend.
 237	 */
 238	if (hcd->self.root_hub->do_remote_wakeup) {
 239		if (ehci->resuming_ports) {
 240			spin_unlock_irq(&ehci->lock);
 241			ehci_dbg(ehci, "suspend failed because a port is resuming\n");
 242			return -EBUSY;
 243		}
 244	}
 245
 246	/* Unlike other USB host controller types, EHCI doesn't have
 247	 * any notion of "global" or bus-wide suspend.  The driver has
 248	 * to manually suspend all the active unsuspended ports, and
 249	 * then manually resume them in the bus_resume() routine.
 250	 */
 251	ehci->bus_suspended = 0;
 252	ehci->owned_ports = 0;
 253	changed = 0;
 254	fs_idle_delay = false;
 255	port = HCS_N_PORTS(ehci->hcs_params);
 256	while (port--) {
 257		u32 __iomem	*reg = &ehci->regs->port_status [port];
 258		u32		t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
 259		u32		t2 = t1 & ~PORT_WAKE_BITS;
 260
 261		/* keep track of which ports we suspend */
 262		if (t1 & PORT_OWNER)
 263			set_bit(port, &ehci->owned_ports);
 264		else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
 265			t2 |= PORT_SUSPEND;
 266			set_bit(port, &ehci->bus_suspended);
 267		}
 268
 269		/* enable remote wakeup on all ports, if told to do so */
 270		if (hcd->self.root_hub->do_remote_wakeup) {
 271			/* only enable appropriate wake bits, otherwise the
 272			 * hardware can not go phy low power mode. If a race
 273			 * condition happens here(connection change during bits
 274			 * set), the port change detection will finally fix it.
 275			 */
 276			if (t1 & PORT_CONNECT)
 277				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
 278			else
 279				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
 280		}
 281
 282		if (t1 != t2) {
 283			/*
 284			 * On some controllers, Wake-On-Disconnect will
 285			 * generate false wakeup signals until the bus
 286			 * switches over to full-speed idle.  For their
 287			 * sake, add a delay if we need one.
 288			 */
 289			if ((t2 & PORT_WKDISC_E) &&
 290					ehci_port_speed(ehci, t2) ==
 291						USB_PORT_STAT_HIGH_SPEED)
 292				fs_idle_delay = true;
 293			ehci_writel(ehci, t2, reg);
 294			changed = 1;
 295		}
 296	}
 297	spin_unlock_irq(&ehci->lock);
 298
 299	if (changed && ehci_has_fsl_susp_errata(ehci))
 300		/*
 301		 * Wait for at least 10 millisecondes to ensure the controller
 302		 * enter the suspend status before initiating a port resume
 303		 * using the Force Port Resume bit (Not-EHCI compatible).
 304		 */
 305		usleep_range(10000, 20000);
 306
 307	if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
 308		/*
 309		 * Wait for HCD to enter low-power mode or for the bus
 310		 * to switch to full-speed idle.
 311		 */
 312		usleep_range(5000, 5500);
 313	}
 314
 315	if (changed && ehci->has_tdi_phy_lpm) {
 316		spin_lock_irq(&ehci->lock);
 317		port = HCS_N_PORTS(ehci->hcs_params);
 318		while (port--) {
 319			u32 __iomem	*hostpc_reg = &ehci->regs->hostpc[port];
 320			u32		t3;
 321
 322			t3 = ehci_readl(ehci, hostpc_reg);
 323			ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
 324			t3 = ehci_readl(ehci, hostpc_reg);
 325			ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
 326					port, (t3 & HOSTPC_PHCD) ?
 327					"succeeded" : "failed");
 328		}
 329		spin_unlock_irq(&ehci->lock);
 330	}
 331
 332	/* Apparently some devices need a >= 1-uframe delay here */
 333	if (ehci->bus_suspended)
 334		udelay(150);
 335
 336	/* turn off now-idle HC */
 337	ehci_halt (ehci);
 338
 339	spin_lock_irq(&ehci->lock);
 340	if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
 341		ehci_handle_controller_death(ehci);
 342	if (ehci->rh_state != EHCI_RH_RUNNING)
 343		goto done;
 344	ehci->rh_state = EHCI_RH_SUSPENDED;
 345
 346	unlink_empty_async_suspended(ehci);
 347
 348	/* Any IAA cycle that started before the suspend is now invalid */
 349	end_iaa_cycle(ehci);
 350	ehci_handle_start_intr_unlinks(ehci);
 351	ehci_handle_intr_unlinks(ehci);
 352	end_free_itds(ehci);
 353
 354	/* allow remote wakeup */
 355	mask = INTR_MASK;
 356	if (!hcd->self.root_hub->do_remote_wakeup)
 357		mask &= ~STS_PCD;
 358	ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 359	ehci_readl(ehci, &ehci->regs->intr_enable);
 360
 361 done:
 362	ehci->next_statechange = jiffies + msecs_to_jiffies(10);
 363	ehci->enabled_hrtimer_events = 0;
 364	ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 365	spin_unlock_irq (&ehci->lock);
 366
 367	hrtimer_cancel(&ehci->hrtimer);
 368	return 0;
 369}
 370
 371
 372/* caller has locked the root hub, and should reset/reinit on error */
 373static int ehci_bus_resume (struct usb_hcd *hcd)
 374{
 375	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
 376	u32			temp;
 377	u32			power_okay;
 378	int			i;
 379	unsigned long		resume_needed = 0;
 380
 381	if (time_before (jiffies, ehci->next_statechange))
 382		msleep(5);
 383	spin_lock_irq (&ehci->lock);
 384	if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
 385		goto shutdown;
 386
 387	if (unlikely(ehci->debug)) {
 388		if (!dbgp_reset_prep(hcd))
 389			ehci->debug = NULL;
 390		else
 391			dbgp_external_startup(hcd);
 392	}
 393
 394	/* Ideally and we've got a real resume here, and no port's power
 395	 * was lost.  (For PCI, that means Vaux was maintained.)  But we
 396	 * could instead be restoring a swsusp snapshot -- so that BIOS was
 397	 * the last user of the controller, not reset/pm hardware keeping
 398	 * state we gave to it.
 399	 */
 400	power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
 401	ehci_dbg(ehci, "resume root hub%s\n",
 402			power_okay ? "" : " after power loss");
 403
 404	/* at least some APM implementations will try to deliver
 405	 * IRQs right away, so delay them until we're ready.
 406	 */
 407	ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 408
 409	/* re-init operational registers */
 410	ehci_writel(ehci, 0, &ehci->regs->segment);
 411	ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 412	ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
 413
 414	/* restore CMD_RUN, framelist size, and irq threshold */
 415	ehci->command |= CMD_RUN;
 416	ehci_writel(ehci, ehci->command, &ehci->regs->command);
 417	ehci->rh_state = EHCI_RH_RUNNING;
 418
 419	/*
 420	 * According to Bugzilla #8190, the port status for some controllers
 421	 * will be wrong without a delay. At their wrong status, the port
 422	 * is enabled, but not suspended neither resumed.
 423	 */
 424	i = HCS_N_PORTS(ehci->hcs_params);
 425	while (i--) {
 426		temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 427		if ((temp & PORT_PE) &&
 428				!(temp & (PORT_SUSPEND | PORT_RESUME))) {
 429			ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
 430			spin_unlock_irq(&ehci->lock);
 431			msleep(8);
 432			spin_lock_irq(&ehci->lock);
 433			break;
 434		}
 435	}
 436
 437	if (ehci->shutdown)
 438		goto shutdown;
 439
 440	/* clear phy low-power mode before resume */
 441	if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
 442		i = HCS_N_PORTS(ehci->hcs_params);
 443		while (i--) {
 444			if (test_bit(i, &ehci->bus_suspended)) {
 445				u32 __iomem	*hostpc_reg =
 446							&ehci->regs->hostpc[i];
 447
 448				temp = ehci_readl(ehci, hostpc_reg);
 449				ehci_writel(ehci, temp & ~HOSTPC_PHCD,
 450						hostpc_reg);
 451			}
 452		}
 453		spin_unlock_irq(&ehci->lock);
 454		msleep(5);
 455		spin_lock_irq(&ehci->lock);
 456		if (ehci->shutdown)
 457			goto shutdown;
 458	}
 459
 460	/* manually resume the ports we suspended during bus_suspend() */
 461	i = HCS_N_PORTS (ehci->hcs_params);
 462	while (i--) {
 463		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 464		temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 465		if (test_bit(i, &ehci->bus_suspended) &&
 466				(temp & PORT_SUSPEND)) {
 467			temp |= PORT_RESUME;
 468			set_bit(i, &resume_needed);
 469		}
 470		ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 471	}
 472
 473	/*
 474	 * msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
 475	 * port
 476	 */
 477	if (resume_needed) {
 478		spin_unlock_irq(&ehci->lock);
 479		msleep(USB_RESUME_TIMEOUT);
 480		spin_lock_irq(&ehci->lock);
 481		if (ehci->shutdown)
 482			goto shutdown;
 483	}
 484
 485	i = HCS_N_PORTS (ehci->hcs_params);
 486	while (i--) {
 487		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
 488		if (test_bit(i, &resume_needed)) {
 489			temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
 490			ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
 491		}
 492	}
 493
 494	ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 495	spin_unlock_irq(&ehci->lock);
 496
 497	ehci_handover_companion_ports(ehci);
 498
 499	/* Now we can safely re-enable irqs */
 500	spin_lock_irq(&ehci->lock);
 501	if (ehci->shutdown)
 502		goto shutdown;
 503	ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
 504	(void) ehci_readl(ehci, &ehci->regs->intr_enable);
 505	spin_unlock_irq(&ehci->lock);
 506
 507	return 0;
 508
 509 shutdown:
 510	spin_unlock_irq(&ehci->lock);
 511	return -ESHUTDOWN;
 512}
 513
 514static unsigned long ehci_get_resuming_ports(struct usb_hcd *hcd)
 515{
 516	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
 517
 518	return ehci->resuming_ports;
 519}
 520
 521#else
 522
 523#define ehci_bus_suspend	NULL
 524#define ehci_bus_resume		NULL
 525#define ehci_get_resuming_ports	NULL
 526
 527#endif	/* CONFIG_PM */
 528
 529/*-------------------------------------------------------------------------*/
 530
 531/*
 532 * Sets the owner of a port
 533 */
 534static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
 535{
 536	u32 __iomem		*status_reg;
 537	u32			port_status;
 538	int 			try;
 539
 540	status_reg = &ehci->regs->port_status[portnum];
 541
 542	/*
 543	 * The controller won't set the OWNER bit if the port is
 544	 * enabled, so this loop will sometimes require at least two
 545	 * iterations: one to disable the port and one to set OWNER.
 546	 */
 547	for (try = 4; try > 0; --try) {
 548		spin_lock_irq(&ehci->lock);
 549		port_status = ehci_readl(ehci, status_reg);
 550		if ((port_status & PORT_OWNER) == new_owner
 551				|| (port_status & (PORT_OWNER | PORT_CONNECT))
 552					== 0)
 553			try = 0;
 554		else {
 555			port_status ^= PORT_OWNER;
 556			port_status &= ~(PORT_PE | PORT_RWC_BITS);
 557			ehci_writel(ehci, port_status, status_reg);
 558		}
 559		spin_unlock_irq(&ehci->lock);
 560		if (try > 1)
 561			msleep(5);
 562	}
 563}
 564
 565/*-------------------------------------------------------------------------*/
 566
 567static int check_reset_complete (
 568	struct ehci_hcd	*ehci,
 569	int		index,
 570	u32 __iomem	*status_reg,
 571	int		port_status
 572) {
 573	if (!(port_status & PORT_CONNECT))
 574		return port_status;
 575
 576	/* if reset finished and it's still not enabled -- handoff */
 577	if (!(port_status & PORT_PE)) {
 578
 579		/* with integrated TT, there's nobody to hand it to! */
 580		if (ehci_is_TDI(ehci)) {
 581			ehci_dbg (ehci,
 582				"Failed to enable port %d on root hub TT\n",
 583				index+1);
 584			return port_status;
 585		}
 586
 587		ehci_dbg (ehci, "port %d full speed --> companion\n",
 588			index + 1);
 589
 590		// what happens if HCS_N_CC(params) == 0 ?
 591		port_status |= PORT_OWNER;
 592		port_status &= ~PORT_RWC_BITS;
 593		ehci_writel(ehci, port_status, status_reg);
 594
 595		/* ensure 440EPX ohci controller state is operational */
 596		if (ehci->has_amcc_usb23)
 597			set_ohci_hcfs(ehci, 1);
 598	} else {
 599		ehci_dbg(ehci, "port %d reset complete, port enabled\n",
 600			index + 1);
 601		/* ensure 440EPx ohci controller state is suspended */
 602		if (ehci->has_amcc_usb23)
 603			set_ohci_hcfs(ehci, 0);
 604	}
 605
 606	return port_status;
 607}
 608
 609/*-------------------------------------------------------------------------*/
 610
 611
 612/* build "status change" packet (one or two bytes) from HC registers */
 613
 614static int
 615ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
 616{
 617	struct ehci_hcd	*ehci = hcd_to_ehci (hcd);
 618	u32		temp, status;
 619	u32		mask;
 620	int		ports, i, retval = 1;
 621	unsigned long	flags;
 622	u32		ppcd = ~0;
 623
 624	/* init status to no-changes */
 625	buf [0] = 0;
 626	ports = HCS_N_PORTS (ehci->hcs_params);
 627	if (ports > 7) {
 628		buf [1] = 0;
 629		retval++;
 630	}
 631
 632	/* Inform the core about resumes-in-progress by returning
 633	 * a non-zero value even if there are no status changes.
 634	 */
 635	status = ehci->resuming_ports;
 636
 637	/* Some boards (mostly VIA?) report bogus overcurrent indications,
 638	 * causing massive log spam unless we completely ignore them.  It
 639	 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
 640	 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
 641	 * PORT_POWER; that's surprising, but maybe within-spec.
 642	 */
 643	if (!ignore_oc)
 644		mask = PORT_CSC | PORT_PEC | PORT_OCC;
 645	else
 646		mask = PORT_CSC | PORT_PEC;
 647	// PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
 648
 649	/* no hub change reports (bit 0) for now (power, ...) */
 650
 651	/* port N changes (bit N)? */
 652	spin_lock_irqsave (&ehci->lock, flags);
 653
 654	/* get per-port change detect bits */
 655	if (ehci->has_ppcd)
 656		ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
 657
 658	for (i = 0; i < ports; i++) {
 659		/* leverage per-port change bits feature */
 660		if (ppcd & (1 << i))
 661			temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
 662		else
 663			temp = 0;
 664
 665		/*
 666		 * Return status information even for ports with OWNER set.
 667		 * Otherwise hub_wq wouldn't see the disconnect event when a
 668		 * high-speed device is switched over to the companion
 669		 * controller by the user.
 670		 */
 671
 672		if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
 673				|| (ehci->reset_done[i] && time_after_eq(
 674					jiffies, ehci->reset_done[i]))) {
 675			if (i < 7)
 676			    buf [0] |= 1 << (i + 1);
 677			else
 678			    buf [1] |= 1 << (i - 7);
 679			status = STS_PCD;
 680		}
 681	}
 682
 683	/* If a resume is in progress, make sure it can finish */
 684	if (ehci->resuming_ports)
 685		mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
 686
 687	spin_unlock_irqrestore (&ehci->lock, flags);
 688	return status ? retval : 0;
 689}
 690
 691/*-------------------------------------------------------------------------*/
 692
 693static void
 694ehci_hub_descriptor (
 695	struct ehci_hcd			*ehci,
 696	struct usb_hub_descriptor	*desc
 697) {
 698	int		ports = HCS_N_PORTS (ehci->hcs_params);
 699	u16		temp;
 700
 701	desc->bDescriptorType = USB_DT_HUB;
 702	desc->bPwrOn2PwrGood = 10;	/* ehci 1.0, 2.3.9 says 20ms max */
 703	desc->bHubContrCurrent = 0;
 704
 705	desc->bNbrPorts = ports;
 706	temp = 1 + (ports / 8);
 707	desc->bDescLength = 7 + 2 * temp;
 708
 709	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
 710	memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
 711	memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 712
 713	temp = HUB_CHAR_INDV_PORT_OCPM;	/* per-port overcurrent reporting */
 714	if (HCS_PPC (ehci->hcs_params))
 715		temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
 716	else
 717		temp |= HUB_CHAR_NO_LPSM; /* no power switching */
 718#if 0
 719// re-enable when we support USB_PORT_FEAT_INDICATOR below.
 720	if (HCS_INDICATOR (ehci->hcs_params))
 721		temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
 722#endif
 723	desc->wHubCharacteristics = cpu_to_le16(temp);
 724}
 725
 726/*-------------------------------------------------------------------------*/
 727#ifdef CONFIG_USB_HCD_TEST_MODE
 728
 729#define EHSET_TEST_SINGLE_STEP_SET_FEATURE 0x06
 730
 731static void usb_ehset_completion(struct urb *urb)
 732{
 733	struct completion  *done = urb->context;
 734
 735	complete(done);
 736}
 737static int submit_single_step_set_feature(
 738	struct usb_hcd	*hcd,
 739	struct urb	*urb,
 740	int		is_setup
 741);
 742
 743/*
 744 * Allocate and initialize a control URB. This request will be used by the
 745 * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
 746 * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
 747 * Return NULL if failed.
 748 */
 749static struct urb *request_single_step_set_feature_urb(
 750	struct usb_device	*udev,
 751	void			*dr,
 752	void			*buf,
 753	struct completion	*done
 754) {
 755	struct urb *urb;
 756	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 757	struct usb_host_endpoint *ep;
 758
 759	urb = usb_alloc_urb(0, GFP_KERNEL);
 760	if (!urb)
 761		return NULL;
 762
 763	urb->pipe = usb_rcvctrlpipe(udev, 0);
 764	ep = (usb_pipein(urb->pipe) ? udev->ep_in : udev->ep_out)
 765				[usb_pipeendpoint(urb->pipe)];
 766	if (!ep) {
 767		usb_free_urb(urb);
 768		return NULL;
 769	}
 770
 771	urb->ep = ep;
 772	urb->dev = udev;
 773	urb->setup_packet = (void *)dr;
 774	urb->transfer_buffer = buf;
 775	urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
 776	urb->complete = usb_ehset_completion;
 777	urb->status = -EINPROGRESS;
 778	urb->actual_length = 0;
 779	urb->transfer_flags = URB_DIR_IN;
 780	usb_get_urb(urb);
 781	atomic_inc(&urb->use_count);
 782	atomic_inc(&urb->dev->urbnum);
 783	urb->setup_dma = dma_map_single(
 784			hcd->self.sysdev,
 785			urb->setup_packet,
 786			sizeof(struct usb_ctrlrequest),
 787			DMA_TO_DEVICE);
 788	urb->transfer_dma = dma_map_single(
 789			hcd->self.sysdev,
 790			urb->transfer_buffer,
 791			urb->transfer_buffer_length,
 792			DMA_FROM_DEVICE);
 793	urb->context = done;
 794	return urb;
 795}
 796
 797static int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 798{
 799	int retval = -ENOMEM;
 800	struct usb_ctrlrequest *dr;
 801	struct urb *urb;
 802	struct usb_device *udev;
 803	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 804	struct usb_device_descriptor *buf;
 805	DECLARE_COMPLETION_ONSTACK(done);
 806
 807	/* Obtain udev of the rhub's child port */
 808	udev = usb_hub_find_child(hcd->self.root_hub, port);
 809	if (!udev) {
 810		ehci_err(ehci, "No device attached to the RootHub\n");
 811		return -ENODEV;
 812	}
 813	buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
 814	if (!buf)
 815		return -ENOMEM;
 816
 817	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 818	if (!dr) {
 819		kfree(buf);
 820		return -ENOMEM;
 821	}
 822
 823	/* Fill Setup packet for GetDescriptor */
 824	dr->bRequestType = USB_DIR_IN;
 825	dr->bRequest = USB_REQ_GET_DESCRIPTOR;
 826	dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
 827	dr->wIndex = 0;
 828	dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
 829	urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
 830	if (!urb)
 831		goto cleanup;
 832
 833	/* Submit just the SETUP stage */
 834	retval = submit_single_step_set_feature(hcd, urb, 1);
 835	if (retval)
 836		goto out1;
 837	if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
 838		usb_kill_urb(urb);
 839		retval = -ETIMEDOUT;
 840		ehci_err(ehci, "%s SETUP stage timed out on ep0\n", __func__);
 841		goto out1;
 842	}
 843	msleep(15 * 1000);
 844
 845	/* Complete remaining DATA and STATUS stages using the same URB */
 846	urb->status = -EINPROGRESS;
 847	usb_get_urb(urb);
 848	atomic_inc(&urb->use_count);
 849	atomic_inc(&urb->dev->urbnum);
 850	retval = submit_single_step_set_feature(hcd, urb, 0);
 851	if (!retval && !wait_for_completion_timeout(&done,
 852						msecs_to_jiffies(2000))) {
 853		usb_kill_urb(urb);
 854		retval = -ETIMEDOUT;
 855		ehci_err(ehci, "%s IN stage timed out on ep0\n", __func__);
 856	}
 857out1:
 858	usb_free_urb(urb);
 859cleanup:
 860	kfree(dr);
 861	kfree(buf);
 862	return retval;
 863}
 864#endif /* CONFIG_USB_HCD_TEST_MODE */
 865/*-------------------------------------------------------------------------*/
 866
 867int ehci_hub_control(
 868	struct usb_hcd	*hcd,
 869	u16		typeReq,
 870	u16		wValue,
 871	u16		wIndex,
 872	char		*buf,
 873	u16		wLength
 874) {
 875	struct ehci_hcd	*ehci = hcd_to_ehci (hcd);
 876	int		ports = HCS_N_PORTS (ehci->hcs_params);
 877	u32 __iomem	*status_reg, *hostpc_reg;
 878	u32		temp, temp1, status;
 879	unsigned long	flags;
 880	int		retval = 0;
 881	unsigned	selector;
 882
 883	/*
 884	 * Avoid underflow while calculating (wIndex & 0xff) - 1.
 885	 * The compiler might deduce that wIndex can never be 0 and then
 886	 * optimize away the tests for !wIndex below.
 887	 */
 888	temp = wIndex & 0xff;
 889	temp -= (temp > 0);
 890	status_reg = &ehci->regs->port_status[temp];
 891	hostpc_reg = &ehci->regs->hostpc[temp];
 892
 893	/*
 894	 * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
 895	 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
 896	 * (track current state ourselves) ... blink for diagnostics,
 897	 * power, "this is the one", etc.  EHCI spec supports this.
 898	 */
 899
 900	spin_lock_irqsave (&ehci->lock, flags);
 901	switch (typeReq) {
 902	case ClearHubFeature:
 903		switch (wValue) {
 904		case C_HUB_LOCAL_POWER:
 905		case C_HUB_OVER_CURRENT:
 906			/* no hub-wide feature/status flags */
 907			break;
 908		default:
 909			goto error;
 910		}
 911		break;
 912	case ClearPortFeature:
 913		if (!wIndex || wIndex > ports)
 914			goto error;
 915		wIndex--;
 916		temp = ehci_readl(ehci, status_reg);
 917		temp &= ~PORT_RWC_BITS;
 918
 919		/*
 920		 * Even if OWNER is set, so the port is owned by the
 921		 * companion controller, hub_wq needs to be able to clear
 922		 * the port-change status bits (especially
 923		 * USB_PORT_STAT_C_CONNECTION).
 924		 */
 925
 926		switch (wValue) {
 927		case USB_PORT_FEAT_ENABLE:
 928			ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 929			break;
 930		case USB_PORT_FEAT_C_ENABLE:
 931			ehci_writel(ehci, temp | PORT_PEC, status_reg);
 932			break;
 933		case USB_PORT_FEAT_SUSPEND:
 934			if (temp & PORT_RESET)
 935				goto error;
 936			if (ehci->no_selective_suspend)
 937				break;
 938#ifdef CONFIG_USB_OTG
 939			if ((hcd->self.otg_port == (wIndex + 1))
 940			    && hcd->self.b_hnp_enable) {
 941				otg_start_hnp(hcd->usb_phy->otg);
 942				break;
 943			}
 944#endif
 945			if (!(temp & PORT_SUSPEND))
 946				break;
 947			if ((temp & PORT_PE) == 0)
 948				goto error;
 949
 950			/* clear phy low-power mode before resume */
 951			if (ehci->has_tdi_phy_lpm) {
 952				temp1 = ehci_readl(ehci, hostpc_reg);
 953				ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
 954						hostpc_reg);
 955				spin_unlock_irqrestore(&ehci->lock, flags);
 956				msleep(5);/* wait to leave low-power mode */
 957				spin_lock_irqsave(&ehci->lock, flags);
 958			}
 959			/* resume signaling for 20 msec */
 960			temp &= ~PORT_WAKE_BITS;
 961			ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 962			ehci->reset_done[wIndex] = jiffies
 963					+ msecs_to_jiffies(USB_RESUME_TIMEOUT);
 964			set_bit(wIndex, &ehci->resuming_ports);
 965			usb_hcd_start_port_resume(&hcd->self, wIndex);
 966			break;
 967		case USB_PORT_FEAT_C_SUSPEND:
 968			clear_bit(wIndex, &ehci->port_c_suspend);
 969			break;
 970		case USB_PORT_FEAT_POWER:
 971			if (HCS_PPC(ehci->hcs_params)) {
 972				spin_unlock_irqrestore(&ehci->lock, flags);
 973				ehci_port_power(ehci, wIndex, false);
 974				spin_lock_irqsave(&ehci->lock, flags);
 975			}
 976			break;
 977		case USB_PORT_FEAT_C_CONNECTION:
 978			ehci_writel(ehci, temp | PORT_CSC, status_reg);
 979			break;
 980		case USB_PORT_FEAT_C_OVER_CURRENT:
 981			ehci_writel(ehci, temp | PORT_OCC, status_reg);
 982			break;
 983		case USB_PORT_FEAT_C_RESET:
 984			/* GetPortStatus clears reset */
 985			break;
 986		default:
 987			goto error;
 988		}
 989		ehci_readl(ehci, &ehci->regs->command);	/* unblock posted write */
 990		break;
 991	case GetHubDescriptor:
 992		ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
 993			buf);
 994		break;
 995	case GetHubStatus:
 996		/* no hub-wide feature/status flags */
 997		memset (buf, 0, 4);
 998		//cpu_to_le32s ((u32 *) buf);
 999		break;
1000	case GetPortStatus:
1001		if (!wIndex || wIndex > ports)
1002			goto error;
1003		wIndex--;
1004		status = 0;
1005		temp = ehci_readl(ehci, status_reg);
1006
1007		// wPortChange bits
1008		if (temp & PORT_CSC)
1009			status |= USB_PORT_STAT_C_CONNECTION << 16;
1010		if (temp & PORT_PEC)
1011			status |= USB_PORT_STAT_C_ENABLE << 16;
1012
1013		if ((temp & PORT_OCC) && !ignore_oc){
1014			status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1015
1016			/*
1017			 * Hubs should disable port power on over-current.
1018			 * However, not all EHCI implementations do this
1019			 * automatically, even if they _do_ support per-port
1020			 * power switching; they're allowed to just limit the
1021			 * current.  hub_wq will turn the power back on.
1022			 */
1023			if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
1024					&& HCS_PPC(ehci->hcs_params)) {
1025				spin_unlock_irqrestore(&ehci->lock, flags);
1026				ehci_port_power(ehci, wIndex, false);
1027				spin_lock_irqsave(&ehci->lock, flags);
1028				temp = ehci_readl(ehci, status_reg);
1029			}
1030		}
1031
1032		/* no reset or resume pending */
1033		if (!ehci->reset_done[wIndex]) {
1034
1035			/* Remote Wakeup received? */
1036			if (temp & PORT_RESUME) {
1037				/* resume signaling for 20 msec */
1038				ehci->reset_done[wIndex] = jiffies
1039						+ msecs_to_jiffies(20);
1040				usb_hcd_start_port_resume(&hcd->self, wIndex);
1041				set_bit(wIndex, &ehci->resuming_ports);
1042				/* check the port again */
1043				mod_timer(&ehci_to_hcd(ehci)->rh_timer,
1044						ehci->reset_done[wIndex]);
1045			}
1046
1047		/* reset or resume not yet complete */
1048		} else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
1049			;	/* wait until it is complete */
1050
1051		/* resume completed */
1052		} else if (test_bit(wIndex, &ehci->resuming_ports)) {
1053			clear_bit(wIndex, &ehci->suspended_ports);
1054			set_bit(wIndex, &ehci->port_c_suspend);
1055			ehci->reset_done[wIndex] = 0;
1056			usb_hcd_end_port_resume(&hcd->self, wIndex);
1057
1058			/* stop resume signaling */
1059			temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
1060			ehci_writel(ehci, temp, status_reg);
1061			clear_bit(wIndex, &ehci->resuming_ports);
1062			retval = ehci_handshake(ehci, status_reg,
1063					PORT_RESUME, 0, 2000 /* 2msec */);
1064			if (retval != 0) {
1065				ehci_err(ehci, "port %d resume error %d\n",
1066						wIndex + 1, retval);
1067				goto error;
1068			}
1069			temp = ehci_readl(ehci, status_reg);
1070
1071		/* whoever resets must GetPortStatus to complete it!! */
1072		} else {
1073			status |= USB_PORT_STAT_C_RESET << 16;
1074			ehci->reset_done [wIndex] = 0;
1075
1076			/* force reset to complete */
1077			ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
1078					status_reg);
1079			/* REVISIT:  some hardware needs 550+ usec to clear
1080			 * this bit; seems too long to spin routinely...
1081			 */
1082			retval = ehci_handshake(ehci, status_reg,
1083					PORT_RESET, 0, 1000);
1084			if (retval != 0) {
1085				ehci_err (ehci, "port %d reset error %d\n",
1086					wIndex + 1, retval);
1087				goto error;
1088			}
1089
1090			/* see what we found out */
1091			temp = check_reset_complete (ehci, wIndex, status_reg,
1092					ehci_readl(ehci, status_reg));
1093		}
1094
1095		/* transfer dedicated ports to the companion hc */
1096		if ((temp & PORT_CONNECT) &&
1097				test_bit(wIndex, &ehci->companion_ports)) {
1098			temp &= ~PORT_RWC_BITS;
1099			temp |= PORT_OWNER;
1100			ehci_writel(ehci, temp, status_reg);
1101			ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
1102			temp = ehci_readl(ehci, status_reg);
1103		}
1104
1105		/*
1106		 * Even if OWNER is set, there's no harm letting hub_wq
1107		 * see the wPortStatus values (they should all be 0 except
1108		 * for PORT_POWER anyway).
1109		 */
1110
1111		if (temp & PORT_CONNECT) {
1112			status |= USB_PORT_STAT_CONNECTION;
1113			// status may be from integrated TT
1114			if (ehci->has_hostpc) {
1115				temp1 = ehci_readl(ehci, hostpc_reg);
1116				status |= ehci_port_speed(ehci, temp1);
1117			} else
1118				status |= ehci_port_speed(ehci, temp);
1119		}
1120		if (temp & PORT_PE)
1121			status |= USB_PORT_STAT_ENABLE;
1122
1123		/* maybe the port was unsuspended without our knowledge */
1124		if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1125			status |= USB_PORT_STAT_SUSPEND;
1126		} else if (test_bit(wIndex, &ehci->suspended_ports)) {
1127			clear_bit(wIndex, &ehci->suspended_ports);
1128			clear_bit(wIndex, &ehci->resuming_ports);
1129			ehci->reset_done[wIndex] = 0;
1130			if (temp & PORT_PE)
1131				set_bit(wIndex, &ehci->port_c_suspend);
1132			usb_hcd_end_port_resume(&hcd->self, wIndex);
1133		}
1134
1135		if (temp & PORT_OC)
1136			status |= USB_PORT_STAT_OVERCURRENT;
1137		if (temp & PORT_RESET)
1138			status |= USB_PORT_STAT_RESET;
1139		if (temp & PORT_POWER)
1140			status |= USB_PORT_STAT_POWER;
1141		if (test_bit(wIndex, &ehci->port_c_suspend))
1142			status |= USB_PORT_STAT_C_SUSPEND << 16;
1143
1144		if (status & ~0xffff)	/* only if wPortChange is interesting */
1145			dbg_port(ehci, "GetStatus", wIndex + 1, temp);
1146		put_unaligned_le32(status, buf);
1147		break;
1148	case SetHubFeature:
1149		switch (wValue) {
1150		case C_HUB_LOCAL_POWER:
1151		case C_HUB_OVER_CURRENT:
1152			/* no hub-wide feature/status flags */
1153			break;
1154		default:
1155			goto error;
1156		}
1157		break;
1158	case SetPortFeature:
1159		selector = wIndex >> 8;
1160		wIndex &= 0xff;
1161		if (unlikely(ehci->debug)) {
1162			/* If the debug port is active any port
1163			 * feature requests should get denied */
1164			if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
1165			    (readl(&ehci->debug->control) & DBGP_ENABLED)) {
1166				retval = -ENODEV;
1167				goto error_exit;
1168			}
1169		}
1170		if (!wIndex || wIndex > ports)
1171			goto error;
1172		wIndex--;
1173		temp = ehci_readl(ehci, status_reg);
1174		if (temp & PORT_OWNER)
1175			break;
1176
1177		temp &= ~PORT_RWC_BITS;
1178		switch (wValue) {
1179		case USB_PORT_FEAT_SUSPEND:
1180			if (ehci->no_selective_suspend)
1181				break;
1182			if ((temp & PORT_PE) == 0
1183					|| (temp & PORT_RESET) != 0)
1184				goto error;
1185
1186			/* After above check the port must be connected.
1187			 * Set appropriate bit thus could put phy into low power
1188			 * mode if we have tdi_phy_lpm feature
1189			 */
1190			temp &= ~PORT_WKCONN_E;
1191			temp |= PORT_WKDISC_E | PORT_WKOC_E;
1192			ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
1193			if (ehci->has_tdi_phy_lpm) {
1194				spin_unlock_irqrestore(&ehci->lock, flags);
1195				msleep(5);/* 5ms for HCD enter low pwr mode */
1196				spin_lock_irqsave(&ehci->lock, flags);
1197				temp1 = ehci_readl(ehci, hostpc_reg);
1198				ehci_writel(ehci, temp1 | HOSTPC_PHCD,
1199					hostpc_reg);
1200				temp1 = ehci_readl(ehci, hostpc_reg);
1201				ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
1202					wIndex, (temp1 & HOSTPC_PHCD) ?
1203					"succeeded" : "failed");
1204			}
1205			if (ehci_has_fsl_susp_errata(ehci)) {
1206				/* 10ms for HCD enter suspend */
1207				spin_unlock_irqrestore(&ehci->lock, flags);
1208				usleep_range(10000, 20000);
1209				spin_lock_irqsave(&ehci->lock, flags);
1210			}
1211			set_bit(wIndex, &ehci->suspended_ports);
1212			break;
1213		case USB_PORT_FEAT_POWER:
1214			if (HCS_PPC(ehci->hcs_params)) {
1215				spin_unlock_irqrestore(&ehci->lock, flags);
1216				ehci_port_power(ehci, wIndex, true);
1217				spin_lock_irqsave(&ehci->lock, flags);
1218			}
1219			break;
1220		case USB_PORT_FEAT_RESET:
1221			if (temp & (PORT_SUSPEND|PORT_RESUME))
1222				goto error;
1223			/* line status bits may report this as low speed,
1224			 * which can be fine if this root hub has a
1225			 * transaction translator built in.
1226			 */
1227			if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
1228					&& !ehci_is_TDI(ehci)
1229					&& PORT_USB11 (temp)) {
1230				ehci_dbg (ehci,
1231					"port %d low speed --> companion\n",
1232					wIndex + 1);
1233				temp |= PORT_OWNER;
1234			} else {
1235				temp |= PORT_RESET;
1236				temp &= ~PORT_PE;
1237
1238				/*
1239				 * caller must wait, then call GetPortStatus
1240				 * usb 2.0 spec says 50 ms resets on root
1241				 */
1242				ehci->reset_done [wIndex] = jiffies
1243						+ msecs_to_jiffies (50);
1244
1245				/*
1246				 * Force full-speed connect for FSL high-speed
1247				 * erratum; disable HS Chirp by setting PFSC bit
1248				 */
1249				if (ehci_has_fsl_hs_errata(ehci))
1250					temp |= (1 << PORTSC_FSL_PFSC);
1251			}
1252			ehci_writel(ehci, temp, status_reg);
1253			break;
1254
1255		/* For downstream facing ports (these):  one hub port is put
1256		 * into test mode according to USB2 11.24.2.13, then the hub
1257		 * must be reset (which for root hub now means rmmod+modprobe,
1258		 * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
1259		 * about the EHCI-specific stuff.
1260		 */
1261		case USB_PORT_FEAT_TEST:
1262#ifdef CONFIG_USB_HCD_TEST_MODE
1263			if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
1264				spin_unlock_irqrestore(&ehci->lock, flags);
1265				retval = ehset_single_step_set_feature(hcd,
1266								wIndex + 1);
1267				spin_lock_irqsave(&ehci->lock, flags);
1268				break;
1269			}
1270#endif
1271			if (!selector || selector > 5)
1272				goto error;
1273			spin_unlock_irqrestore(&ehci->lock, flags);
1274			ehci_quiesce(ehci);
1275			spin_lock_irqsave(&ehci->lock, flags);
1276
1277			/* Put all enabled ports into suspend */
1278			while (ports--) {
1279				u32 __iomem *sreg =
1280						&ehci->regs->port_status[ports];
1281
1282				temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
1283				if (temp & PORT_PE)
1284					ehci_writel(ehci, temp | PORT_SUSPEND,
1285							sreg);
1286			}
1287
1288			spin_unlock_irqrestore(&ehci->lock, flags);
1289			ehci_halt(ehci);
1290			spin_lock_irqsave(&ehci->lock, flags);
1291
1292			temp = ehci_readl(ehci, status_reg);
1293			temp |= selector << 16;
1294			ehci_writel(ehci, temp, status_reg);
1295			break;
1296
1297		default:
1298			goto error;
1299		}
1300		ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */
1301		break;
1302
1303	default:
1304error:
1305		/* "stall" on error */
1306		retval = -EPIPE;
1307	}
1308error_exit:
1309	spin_unlock_irqrestore (&ehci->lock, flags);
1310	return retval;
1311}
1312EXPORT_SYMBOL_GPL(ehci_hub_control);
1313
1314static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
1315{
1316	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
1317
1318	if (ehci_is_TDI(ehci))
1319		return;
1320	set_owner(ehci, --portnum, PORT_OWNER);
1321}
1322
1323static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
1324{
1325	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
1326	u32 __iomem		*reg;
1327
1328	if (ehci_is_TDI(ehci))
1329		return 0;
1330	reg = &ehci->regs->port_status[portnum - 1];
1331	return ehci_readl(ehci, reg) & PORT_OWNER;
1332}
1333
1334static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
1335{
1336	struct usb_hcd *hcd = ehci_to_hcd(ehci);
1337	u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
1338	u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
1339
1340	if (enable)
1341		ehci_writel(ehci, temp | PORT_POWER, status_reg);
1342	else
1343		ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
1344
1345	if (hcd->driver->port_power)
1346		hcd->driver->port_power(hcd, portnum, enable);
1347
1348	return 0;
1349}