[mirror_ubuntu-artful-kernel.git] / drivers / usb / host / ehci-hub.c

/*
 * Copyright (C) 2001-2004 by David Brownell
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* this file is part of ehci-hcd.c */

/*-------------------------------------------------------------------------*/

/*
 * EHCI Root Hub ... the nonsharable stuff
 *
 * Registers don't need cpu_to_le32, that happens transparently
 */

/*-------------------------------------------------------------------------*/

#ifdef	CONFIG_PM

static int ehci_bus_suspend (struct usb_hcd *hcd)
{
	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
	int			port;
	int			mask;

	if (time_before (jiffies, ehci->next_statechange))
		msleep(5);

	port = HCS_N_PORTS (ehci->hcs_params);
	spin_lock_irq (&ehci->lock);

	/* stop schedules, clean any completed work */
	if (HC_IS_RUNNING(hcd->state)) {
		ehci_quiesce (ehci);
		hcd->state = HC_STATE_QUIESCING;
	}
	ehci->command = ehci_readl(ehci, &ehci->regs->command);
	if (ehci->reclaim)
		ehci->reclaim_ready = 1;
	ehci_work(ehci);

	/* Unlike other USB host controller types, EHCI doesn't have
	 * any notion of "global" or bus-wide suspend.  The driver has
	 * to manually suspend all the active unsuspended ports, and
	 * then manually resume them in the bus_resume() routine.
	 */
	ehci->bus_suspended = 0;
	while (port--) {
		u32 __iomem	*reg = &ehci->regs->port_status [port];
		u32		t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
		u32		t2 = t1;

		/* keep track of which ports we suspend */
		if ((t1 & PORT_PE) && !(t1 & PORT_OWNER) &&
				!(t1 & PORT_SUSPEND)) {
			t2 |= PORT_SUSPEND;
			set_bit(port, &ehci->bus_suspended);
		}

		/* enable remote wakeup on all ports */
		if (device_may_wakeup(&hcd->self.root_hub->dev))
			t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
		else
			t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);

		if (t1 != t2) {
			ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
				port + 1, t1, t2);
			ehci_writel(ehci, t2, reg);
		}
	}

	/* turn off now-idle HC */
	del_timer_sync (&ehci->watchdog);
	ehci_halt (ehci);
	hcd->state = HC_STATE_SUSPENDED;

	/* allow remote wakeup */
	mask = INTR_MASK;
	if (!device_may_wakeup(&hcd->self.root_hub->dev))
		mask &= ~STS_PCD;
	ehci_writel(ehci, mask, &ehci->regs->intr_enable);
	ehci_readl(ehci, &ehci->regs->intr_enable);

	ehci->next_statechange = jiffies + msecs_to_jiffies(10);
	spin_unlock_irq (&ehci->lock);
	return 0;
}


/* caller has locked the root hub, and should reset/reinit on error */
static int ehci_bus_resume (struct usb_hcd *hcd)
{
	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
	u32			temp;
	int			i;

	if (time_before (jiffies, ehci->next_statechange))
		msleep(5);
	spin_lock_irq (&ehci->lock);

	/* Ideally and we've got a real resume here, and no port's power
	 * was lost.  (For PCI, that means Vaux was maintained.)  But we
	 * could instead be restoring a swsusp snapshot -- so that BIOS was
	 * the last user of the controller, not reset/pm hardware keeping
	 * state we gave to it.
	 */
	temp = ehci_readl(ehci, &ehci->regs->intr_enable);
	ehci_dbg(ehci, "resume root hub%s\n", temp ? "" : " after power loss");

	/* at least some APM implementations will try to deliver
	 * IRQs right away, so delay them until we're ready.
	 */
	ehci_writel(ehci, 0, &ehci->regs->intr_enable);

	/* re-init operational registers */
	ehci_writel(ehci, 0, &ehci->regs->segment);
	ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
	ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);

	/* restore CMD_RUN, framelist size, and irq threshold */
	ehci_writel(ehci, ehci->command, &ehci->regs->command);

	/* manually resume the ports we suspended during bus_suspend() */
	i = HCS_N_PORTS (ehci->hcs_params);
	while (i--) {
		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
		temp &= ~(PORT_RWC_BITS
			| PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
		if (test_bit(i, &ehci->bus_suspended) &&
				(temp & PORT_SUSPEND)) {
			ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
			temp |= PORT_RESUME;
		}
		ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
	}
	i = HCS_N_PORTS (ehci->hcs_params);
	mdelay (20);
	while (i--) {
		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
		if (test_bit(i, &ehci->bus_suspended) &&
				(temp & PORT_SUSPEND)) {
			temp &= ~(PORT_RWC_BITS | PORT_RESUME);
			ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
			ehci_vdbg (ehci, "resumed port %d\n", i + 1);
		}
	}
	(void) ehci_readl(ehci, &ehci->regs->command);

	/* maybe re-activate the schedule(s) */
	temp = 0;
	if (ehci->async->qh_next.qh)
		temp |= CMD_ASE;
	if (ehci->periodic_sched)
		temp |= CMD_PSE;
	if (temp) {
		ehci->command |= temp;
		ehci_writel(ehci, ehci->command, &ehci->regs->command);
	}

	ehci->next_statechange = jiffies + msecs_to_jiffies(5);
	hcd->state = HC_STATE_RUNNING;

	/* Now we can safely re-enable irqs */
	ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);

	spin_unlock_irq (&ehci->lock);
	return 0;
}

#else

#define ehci_bus_suspend	NULL
#define ehci_bus_resume		NULL

#endif	/* CONFIG_PM */

/*-------------------------------------------------------------------------*/

static int check_reset_complete (
	struct ehci_hcd	*ehci,
	int		index,
	u32 __iomem	*status_reg,
	int		port_status
) {
	if (!(port_status & PORT_CONNECT)) {
		ehci->reset_done [index] = 0;
		return port_status;
	}

	/* if reset finished and it's still not enabled -- handoff */
	if (!(port_status & PORT_PE)) {

		/* with integrated TT, there's nobody to hand it to! */
		if (ehci_is_TDI(ehci)) {
			ehci_dbg (ehci,
				"Failed to enable port %d on root hub TT\n",
				index+1);
			return port_status;
		}

		ehci_dbg (ehci, "port %d full speed --> companion\n",
			index + 1);

		// what happens if HCS_N_CC(params) == 0 ?
		port_status |= PORT_OWNER;
		port_status &= ~PORT_RWC_BITS;
		ehci_writel(ehci, port_status, status_reg);

	} else
		ehci_dbg (ehci, "port %d high speed\n", index + 1);

	return port_status;
}

/*-------------------------------------------------------------------------*/


/* build "status change" packet (one or two bytes) from HC registers */

static int
ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
{
	struct ehci_hcd	*ehci = hcd_to_ehci (hcd);
	u32		temp, status = 0;
	u32		mask;
	int		ports, i, retval = 1;
	unsigned long	flags;

	/* if !USB_SUSPEND, root hub timers won't get shut down ... */
	if (!HC_IS_RUNNING(hcd->state))
		return 0;

	/* init status to no-changes */
	buf [0] = 0;
	ports = HCS_N_PORTS (ehci->hcs_params);
	if (ports > 7) {
		buf [1] = 0;
		retval++;
	}

	/* Some boards (mostly VIA?) report bogus overcurrent indications,
	 * causing massive log spam unless we completely ignore them.  It
	 * may be relevant that VIA VT8235 controlers, where PORT_POWER is
	 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
	 * PORT_POWER; that's surprising, but maybe within-spec.
	 */
	if (!ignore_oc)
		mask = PORT_CSC | PORT_PEC | PORT_OCC;
	else
		mask = PORT_CSC | PORT_PEC;
	// PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND

	/* no hub change reports (bit 0) for now (power, ...) */

	/* port N changes (bit N)? */
	spin_lock_irqsave (&ehci->lock, flags);
	for (i = 0; i < ports; i++) {
		temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
		if (temp & PORT_OWNER) {
			/* don't report this in GetPortStatus */
			if (temp & PORT_CSC) {
				temp &= ~PORT_RWC_BITS;
				temp |= PORT_CSC;
				ehci_writel(ehci, temp,
					    &ehci->regs->port_status [i]);
			}
			continue;
		}
		if (!(temp & PORT_CONNECT))
			ehci->reset_done [i] = 0;
		if ((temp & mask) != 0
				|| ((temp & PORT_RESUME) != 0
					&& time_after (jiffies,
						ehci->reset_done [i]))) {
			if (i < 7)
			    buf [0] |= 1 << (i + 1);
			else
			    buf [1] |= 1 << (i - 7);
			status = STS_PCD;
		}
	}
	/* FIXME autosuspend idle root hubs */
	spin_unlock_irqrestore (&ehci->lock, flags);
	return status ? retval : 0;
}

/*-------------------------------------------------------------------------*/

static void
ehci_hub_descriptor (
	struct ehci_hcd			*ehci,
	struct usb_hub_descriptor	*desc
) {
	int		ports = HCS_N_PORTS (ehci->hcs_params);
	u16		temp;

	desc->bDescriptorType = 0x29;
	desc->bPwrOn2PwrGood = 10;	/* ehci 1.0, 2.3.9 says 20ms max */
	desc->bHubContrCurrent = 0;

	desc->bNbrPorts = ports;
	temp = 1 + (ports / 8);
	desc->bDescLength = 7 + 2 * temp;

	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
	memset (&desc->bitmap [0], 0, temp);
	memset (&desc->bitmap [temp], 0xff, temp);

	temp = 0x0008;			/* per-port overcurrent reporting */
	if (HCS_PPC (ehci->hcs_params))
		temp |= 0x0001;		/* per-port power control */
	else
		temp |= 0x0002;		/* no power switching */
#if 0
// re-enable when we support USB_PORT_FEAT_INDICATOR below.
	if (HCS_INDICATOR (ehci->hcs_params))
		temp |= 0x0080;		/* per-port indicators (LEDs) */
#endif
	desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
}

/*-------------------------------------------------------------------------*/

#define	PORT_WAKE_BITS	(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)

static int ehci_hub_control (
	struct usb_hcd	*hcd,
	u16		typeReq,
	u16		wValue,
	u16		wIndex,
	char		*buf,
	u16		wLength
) {
	struct ehci_hcd	*ehci = hcd_to_ehci (hcd);
	int		ports = HCS_N_PORTS (ehci->hcs_params);
	u32 __iomem	*status_reg = &ehci->regs->port_status[wIndex - 1];
	u32		temp, status;
	unsigned long	flags;
	int		retval = 0;
	unsigned	selector;

	/*
	 * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
	 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
	 * (track current state ourselves) ... blink for diagnostics,
	 * power, "this is the one", etc.  EHCI spec supports this.
	 */

	spin_lock_irqsave (&ehci->lock, flags);
	switch (typeReq) {
	case ClearHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case ClearPortFeature:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		temp = ehci_readl(ehci, status_reg);
		if (temp & PORT_OWNER)
			break;

		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
			ehci_writel(ehci, temp & ~PORT_PE, status_reg);
			break;
		case USB_PORT_FEAT_C_ENABLE:
			ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
					status_reg);
			break;
		case USB_PORT_FEAT_SUSPEND:
			if (temp & PORT_RESET)
				goto error;
			if (ehci->no_selective_suspend)
				break;
			if (temp & PORT_SUSPEND) {
				if ((temp & PORT_PE) == 0)
					goto error;
				/* resume signaling for 20 msec */
				temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
				ehci_writel(ehci, temp | PORT_RESUME,
						status_reg);
				ehci->reset_done [wIndex] = jiffies
						+ msecs_to_jiffies (20);
			}
			break;
		case USB_PORT_FEAT_C_SUSPEND:
			/* we auto-clear this feature */
			break;
		case USB_PORT_FEAT_POWER:
			if (HCS_PPC (ehci->hcs_params))
				ehci_writel(ehci,
					  temp & ~(PORT_RWC_BITS | PORT_POWER),
					  status_reg);
			break;
		case USB_PORT_FEAT_C_CONNECTION:
			ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
					status_reg);
			break;
		case USB_PORT_FEAT_C_OVER_CURRENT:
			ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
					status_reg);
			break;
		case USB_PORT_FEAT_C_RESET:
			/* GetPortStatus clears reset */
			break;
		default:
			goto error;
		}
		ehci_readl(ehci, &ehci->regs->command);	/* unblock posted write */
		break;
	case GetHubDescriptor:
		ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
			buf);
		break;
	case GetHubStatus:
		/* no hub-wide feature/status flags */
		memset (buf, 0, 4);
		//cpu_to_le32s ((u32 *) buf);
		break;
	case GetPortStatus:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		status = 0;
		temp = ehci_readl(ehci, status_reg);

		// wPortChange bits
		if (temp & PORT_CSC)
			status |= 1 << USB_PORT_FEAT_C_CONNECTION;
		if (temp & PORT_PEC)
			status |= 1 << USB_PORT_FEAT_C_ENABLE;
		if ((temp & PORT_OCC) && !ignore_oc)
			status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;

		/* whoever resumes must GetPortStatus to complete it!! */
		if ((temp & PORT_RESUME)
				&& time_after (jiffies,
					ehci->reset_done [wIndex])) {
			status |= 1 << USB_PORT_FEAT_C_SUSPEND;
			ehci->reset_done [wIndex] = 0;

			/* stop resume signaling */
			temp = ehci_readl(ehci, status_reg);
			ehci_writel(ehci,
					temp & ~(PORT_RWC_BITS | PORT_RESUME),
					status_reg);
			retval = handshake(ehci, status_reg,
					   PORT_RESUME, 0, 2000 /* 2msec */);
			if (retval != 0) {
				ehci_err (ehci, "port %d resume error %d\n",
					wIndex + 1, retval);
				goto error;
			}
			temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
		}

		/* whoever resets must GetPortStatus to complete it!! */
		if ((temp & PORT_RESET)
				&& time_after (jiffies,
					ehci->reset_done [wIndex])) {
			status |= 1 << USB_PORT_FEAT_C_RESET;
			ehci->reset_done [wIndex] = 0;

			/* force reset to complete */
			ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
					status_reg);
			/* REVISIT:  some hardware needs 550+ usec to clear
			 * this bit; seems too long to spin routinely...
			 */
			retval = handshake(ehci, status_reg,
					PORT_RESET, 0, 750);
			if (retval != 0) {
				ehci_err (ehci, "port %d reset error %d\n",
					wIndex + 1, retval);
				goto error;
			}

			/* see what we found out */
			temp = check_reset_complete (ehci, wIndex, status_reg,
					ehci_readl(ehci, status_reg));
		}

		// don't show wPortStatus if it's owned by a companion hc
		if (!(temp & PORT_OWNER)) {
			if (temp & PORT_CONNECT) {
				status |= 1 << USB_PORT_FEAT_CONNECTION;
				// status may be from integrated TT
				status |= ehci_port_speed(ehci, temp);
			}
			if (temp & PORT_PE)
				status |= 1 << USB_PORT_FEAT_ENABLE;
			if (temp & (PORT_SUSPEND|PORT_RESUME))
				status |= 1 << USB_PORT_FEAT_SUSPEND;
			if (temp & PORT_OC)
				status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
			if (temp & PORT_RESET)
				status |= 1 << USB_PORT_FEAT_RESET;
			if (temp & PORT_POWER)
				status |= 1 << USB_PORT_FEAT_POWER;
		}

#ifndef	EHCI_VERBOSE_DEBUG
	if (status & ~0xffff)	/* only if wPortChange is interesting */
#endif
		dbg_port (ehci, "GetStatus", wIndex + 1, temp);
		// we "know" this alignment is good, caller used kmalloc()...
		*((__le32 *) buf) = cpu_to_le32 (status);
		break;
	case SetHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case SetPortFeature:
		selector = wIndex >> 8;
		wIndex &= 0xff;
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		temp = ehci_readl(ehci, status_reg);
		if (temp & PORT_OWNER)
			break;

		temp &= ~PORT_RWC_BITS;
		switch (wValue) {
		case USB_PORT_FEAT_SUSPEND:
			if (ehci->no_selective_suspend)
				break;
			if ((temp & PORT_PE) == 0
					|| (temp & PORT_RESET) != 0)
				goto error;
			if (device_may_wakeup(&hcd->self.root_hub->dev))
				temp |= PORT_WAKE_BITS;
			ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
			break;
		case USB_PORT_FEAT_POWER:
			if (HCS_PPC (ehci->hcs_params))
				ehci_writel(ehci, temp | PORT_POWER,
						status_reg);
			break;
		case USB_PORT_FEAT_RESET:
			if (temp & PORT_RESUME)
				goto error;
			/* line status bits may report this as low speed,
			 * which can be fine if this root hub has a
			 * transaction translator built in.
			 */
			if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
					&& !ehci_is_TDI(ehci)
					&& PORT_USB11 (temp)) {
				ehci_dbg (ehci,
					"port %d low speed --> companion\n",
					wIndex + 1);
				temp |= PORT_OWNER;
			} else {
				ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
				temp |= PORT_RESET;
				temp &= ~PORT_PE;

				/*
				 * caller must wait, then call GetPortStatus
				 * usb 2.0 spec says 50 ms resets on root
				 */
				ehci->reset_done [wIndex] = jiffies
						+ msecs_to_jiffies (50);
			}
			ehci_writel(ehci, temp, status_reg);
			break;

		/* For downstream facing ports (these):  one hub port is put
		 * into test mode according to USB2 11.24.2.13, then the hub
		 * must be reset (which for root hub now means rmmod+modprobe,
		 * or else system reboot).  See EHCI 2.3.9 and 4.14 for info
		 * about the EHCI-specific stuff.
		 */
		case USB_PORT_FEAT_TEST:
			if (!selector || selector > 5)
				goto error;
			ehci_quiesce(ehci);
			ehci_halt(ehci);
			temp |= selector << 16;
			ehci_writel(ehci, temp, status_reg);
			break;

		default:
			goto error;
		}
		ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */
		break;

	default:
error:
		/* "stall" on error */
		retval = -EPIPE;
	}
	spin_unlock_irqrestore (&ehci->lock, flags);
	return retval;
}
Commit	Line	Data
1da177e4	1	/*
d49d4317	2	* Copyright (C) 2001-2004 by David Brownell
53bd6a60	3	*
1da177e4 LT	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License as published by the
	6	* Free Software Foundation; either version 2 of the License, or (at your
	7	* option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	11	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	12	* for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software Foundation,
	16	* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	17	*/
	18
	19	/* this file is part of ehci-hcd.c */
	20
	21	/-------------------------------------------------------------------------/
	22
	23	/*
	24	* EHCI Root Hub ... the nonsharable stuff
	25	*
	26	* Registers don't need cpu_to_le32, that happens transparently
	27	*/
	28
	29	/-------------------------------------------------------------------------/
	30
	31	#ifdef CONFIG_PM
	32
0c0382e3	33	static int ehci_bus_suspend (struct usb_hcd *hcd)
1da177e4 LT	34	{
	35	struct ehci_hcd *ehci = hcd_to_ehci (hcd);
	36	int port;
8c03356a	37	int mask;
1da177e4 LT	38
	39	if (time_before (jiffies, ehci->next_statechange))
	40	msleep(5);
	41
	42	port = HCS_N_PORTS (ehci->hcs_params);
	43	spin_lock_irq (&ehci->lock);
	44
	45	/* stop schedules, clean any completed work */
	46	if (HC_IS_RUNNING(hcd->state)) {
	47	ehci_quiesce (ehci);
	48	hcd->state = HC_STATE_QUIESCING;
	49	}
083522d7	50	ehci->command = ehci_readl(ehci, &ehci->regs->command);
1da177e4	51	if (ehci->reclaim)
64f89798	52	ehci->reclaim_ready = 1;
7d12e780	53	ehci_work(ehci);
1da177e4	54
8c03356a AS	55	/* Unlike other USB host controller types, EHCI doesn't have
	56	* any notion of "global" or bus-wide suspend. The driver has
	57	* to manually suspend all the active unsuspended ports, and
	58	* then manually resume them in the bus_resume() routine.
	59	*/
	60	ehci->bus_suspended = 0;
1da177e4 LT	61	while (port--) {
1da177e4 LT	62	u32 __iomem *reg = &ehci->regs->port_status [port];
083522d7	63	u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
1da177e4 LT	64	u32 t2 = t1;
1da177e4 LT	65
8c03356a AS	66	/* keep track of which ports we suspend */
	67	if ((t1 & PORT_PE) && !(t1 & PORT_OWNER) &&
	68	!(t1 & PORT_SUSPEND)) {
1da177e4	69	t2 \|= PORT_SUSPEND;
8c03356a AS	70	set_bit(port, &ehci->bus_suspended);
	71	}
	72
	73	/* enable remote wakeup on all ports */
2c1c3c4c	74	if (device_may_wakeup(&hcd->self.root_hub->dev))
1da177e4 LT	75	t2 \|= PORT_WKOC_E\|PORT_WKDISC_E\|PORT_WKCONN_E;
	76	else
	77	t2 &= ~(PORT_WKOC_E\|PORT_WKDISC_E\|PORT_WKCONN_E);
	78
	79	if (t1 != t2) {
	80	ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
	81	port + 1, t1, t2);
083522d7	82	ehci_writel(ehci, t2, reg);
1da177e4 LT	83	}
	84	}
	85
	86	/* turn off now-idle HC */
4756ae5b	87	del_timer_sync (&ehci->watchdog);
1da177e4 LT	88	ehci_halt (ehci);
	89	hcd->state = HC_STATE_SUSPENDED;
	90
8c03356a AS	91	/* allow remote wakeup */
	92	mask = INTR_MASK;
	93	if (!device_may_wakeup(&hcd->self.root_hub->dev))
	94	mask &= ~STS_PCD;
083522d7 BH	95	ehci_writel(ehci, mask, &ehci->regs->intr_enable);
083522d7 BH	96	ehci_readl(ehci, &ehci->regs->intr_enable);
8c03356a	97
1da177e4 LT	98	ehci->next_statechange = jiffies + msecs_to_jiffies(10);
	99	spin_unlock_irq (&ehci->lock);
	100	return 0;
	101	}
	102
	103
	104	/* caller has locked the root hub, and should reset/reinit on error */
0c0382e3	105	static int ehci_bus_resume (struct usb_hcd *hcd)
1da177e4 LT	106	{
	107	struct ehci_hcd *ehci = hcd_to_ehci (hcd);
	108	u32 temp;
	109	int i;
1da177e4 LT	110
	111	if (time_before (jiffies, ehci->next_statechange))
	112	msleep(5);
	113	spin_lock_irq (&ehci->lock);
	114
f03c17fc DB	115	/* Ideally and we've got a real resume here, and no port's power
	116	* was lost. (For PCI, that means Vaux was maintained.) But we
	117	* could instead be restoring a swsusp snapshot -- so that BIOS was
	118	* the last user of the controller, not reset/pm hardware keeping
	119	* state we gave to it.
	120	*/
083522d7	121	temp = ehci_readl(ehci, &ehci->regs->intr_enable);
8c03356a	122	ehci_dbg(ehci, "resume root hub%s\n", temp ? "" : " after power loss");
f03c17fc	123
8c03356a AS	124	/* at least some APM implementations will try to deliver
	125	* IRQs right away, so delay them until we're ready.
	126	*/
083522d7	127	ehci_writel(ehci, 0, &ehci->regs->intr_enable);
8c03356a AS	128
8c03356a AS	129	/* re-init operational registers */
083522d7 BH	130	ehci_writel(ehci, 0, &ehci->regs->segment);
	131	ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
	132	ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
1da177e4 LT	133
1da177e4 LT	134	/* restore CMD_RUN, framelist size, and irq threshold */
083522d7	135	ehci_writel(ehci, ehci->command, &ehci->regs->command);
1da177e4	136
8c03356a	137	/* manually resume the ports we suspended during bus_suspend() */
1da177e4 LT	138	i = HCS_N_PORTS (ehci->hcs_params);
1da177e4 LT	139	while (i--) {
083522d7	140	temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
10f6524a DB	141	temp &= ~(PORT_RWC_BITS
10f6524a DB	142	\| PORT_WKOC_E \| PORT_WKDISC_E \| PORT_WKCONN_E);
8c03356a AS	143	if (test_bit(i, &ehci->bus_suspended) &&
8c03356a AS	144	(temp & PORT_SUSPEND)) {
1da177e4 LT	145	ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
	146	temp \|= PORT_RESUME;
	147	}
083522d7	148	ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
1da177e4 LT	149	}
	150	i = HCS_N_PORTS (ehci->hcs_params);
	151	mdelay (20);
	152	while (i--) {
083522d7	153	temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
8c03356a AS	154	if (test_bit(i, &ehci->bus_suspended) &&
	155	(temp & PORT_SUSPEND)) {
	156	temp &= ~(PORT_RWC_BITS \| PORT_RESUME);
083522d7	157	ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
8c03356a AS	158	ehci_vdbg (ehci, "resumed port %d\n", i + 1);
8c03356a AS	159	}
1da177e4	160	}
083522d7	161	(void) ehci_readl(ehci, &ehci->regs->command);
1da177e4 LT	162
	163	/* maybe re-activate the schedule(s) */
	164	temp = 0;
	165	if (ehci->async->qh_next.qh)
	166	temp \|= CMD_ASE;
	167	if (ehci->periodic_sched)
	168	temp \|= CMD_PSE;
	169	if (temp) {
	170	ehci->command \|= temp;
083522d7	171	ehci_writel(ehci, ehci->command, &ehci->regs->command);
1da177e4 LT	172	}
	173
	174	ehci->next_statechange = jiffies + msecs_to_jiffies(5);
	175	hcd->state = HC_STATE_RUNNING;
	176
	177	/* Now we can safely re-enable irqs */
083522d7	178	ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
1da177e4 LT	179
	180	spin_unlock_irq (&ehci->lock);
	181	return 0;
	182	}
	183
	184	#else
	185
0c0382e3 AS	186	#define ehci_bus_suspend NULL
0c0382e3 AS	187	#define ehci_bus_resume NULL
1da177e4 LT	188
	189	#endif /* CONFIG_PM */
	190
	191	/-------------------------------------------------------------------------/
	192
	193	static int check_reset_complete (
	194	struct ehci_hcd *ehci,
	195	int index,
e6316565	196	u32 __iomem *status_reg,
1da177e4 LT	197	int port_status
	198	) {
	199	if (!(port_status & PORT_CONNECT)) {
	200	ehci->reset_done [index] = 0;
	201	return port_status;
	202	}
	203
	204	/* if reset finished and it's still not enabled -- handoff */
	205	if (!(port_status & PORT_PE)) {
	206
	207	/* with integrated TT, there's nobody to hand it to! */
	208	if (ehci_is_TDI(ehci)) {
	209	ehci_dbg (ehci,
	210	"Failed to enable port %d on root hub TT\n",
	211	index+1);
	212	return port_status;
	213	}
	214
	215	ehci_dbg (ehci, "port %d full speed --> companion\n",
	216	index + 1);
	217
	218	// what happens if HCS_N_CC(params) == 0 ?
	219	port_status \|= PORT_OWNER;
10f6524a	220	port_status &= ~PORT_RWC_BITS;
e6316565	221	ehci_writel(ehci, port_status, status_reg);
1da177e4 LT	222
	223	} else
	224	ehci_dbg (ehci, "port %d high speed\n", index + 1);
	225
	226	return port_status;
	227	}
	228
	229	/-------------------------------------------------------------------------/
	230
	231
	232	/* build "status change" packet (one or two bytes) from HC registers */
	233
	234	static int
	235	ehci_hub_status_data (struct usb_hcd hcd, char buf)
	236	{
	237	struct ehci_hcd *ehci = hcd_to_ehci (hcd);
	238	u32 temp, status = 0;
93f1a47c	239	u32 mask;
1da177e4 LT	240	int ports, i, retval = 1;
	241	unsigned long flags;
	242
	243	/* if !USB_SUSPEND, root hub timers won't get shut down ... */
	244	if (!HC_IS_RUNNING(hcd->state))
	245	return 0;
	246
	247	/* init status to no-changes */
	248	buf [0] = 0;
	249	ports = HCS_N_PORTS (ehci->hcs_params);
	250	if (ports > 7) {
	251	buf [1] = 0;
	252	retval++;
	253	}
53bd6a60	254
93f1a47c DB	255	/* Some boards (mostly VIA?) report bogus overcurrent indications,
	256	* causing massive log spam unless we completely ignore them. It
	257	* may be relevant that VIA VT8235 controlers, where PORT_POWER is
	258	* always set, seem to clear PORT_OCC and PORT_CSC when writing to
	259	* PORT_POWER; that's surprising, but maybe within-spec.
	260	*/
	261	if (!ignore_oc)
	262	mask = PORT_CSC \| PORT_PEC \| PORT_OCC;
	263	else
	264	mask = PORT_CSC \| PORT_PEC;
	265	// PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
	266
1da177e4 LT	267	/* no hub change reports (bit 0) for now (power, ...) */
	268
	269	/* port N changes (bit N)? */
	270	spin_lock_irqsave (&ehci->lock, flags);
	271	for (i = 0; i < ports; i++) {
083522d7	272	temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
1da177e4 LT	273	if (temp & PORT_OWNER) {
	274	/* don't report this in GetPortStatus */
	275	if (temp & PORT_CSC) {
10f6524a DB	276	temp &= ~PORT_RWC_BITS;
10f6524a DB	277	temp \|= PORT_CSC;
083522d7 BH	278	ehci_writel(ehci, temp,
083522d7 BH	279	&ehci->regs->port_status [i]);
1da177e4 LT	280	}
	281	continue;
	282	}
	283	if (!(temp & PORT_CONNECT))
	284	ehci->reset_done [i] = 0;
93f1a47c	285	if ((temp & mask) != 0
1da177e4 LT	286	\|\| ((temp & PORT_RESUME) != 0
	287	&& time_after (jiffies,
	288	ehci->reset_done [i]))) {
	289	if (i < 7)
	290	buf [0] \|= 1 << (i + 1);
	291	else
	292	buf [1] \|= 1 << (i - 7);
	293	status = STS_PCD;
	294	}
	295	}
	296	/* FIXME autosuspend idle root hubs */
	297	spin_unlock_irqrestore (&ehci->lock, flags);
	298	return status ? retval : 0;
	299	}
	300
	301	/-------------------------------------------------------------------------/
	302
	303	static void
	304	ehci_hub_descriptor (
	305	struct ehci_hcd *ehci,
	306	struct usb_hub_descriptor *desc
	307	) {
	308	int ports = HCS_N_PORTS (ehci->hcs_params);
	309	u16 temp;
	310
	311	desc->bDescriptorType = 0x29;
	312	desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
	313	desc->bHubContrCurrent = 0;
	314
	315	desc->bNbrPorts = ports;
	316	temp = 1 + (ports / 8);
	317	desc->bDescLength = 7 + 2 * temp;
	318
	319	/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
	320	memset (&desc->bitmap [0], 0, temp);
	321	memset (&desc->bitmap [temp], 0xff, temp);
	322
	323	temp = 0x0008; /* per-port overcurrent reporting */
	324	if (HCS_PPC (ehci->hcs_params))
	325	temp \|= 0x0001; /* per-port power control */
56c1e26d DB	326	else
56c1e26d DB	327	temp \|= 0x0002; /* no power switching */
1da177e4 LT	328	#if 0
	329	// re-enable when we support USB_PORT_FEAT_INDICATOR below.
	330	if (HCS_INDICATOR (ehci->hcs_params))
	331	temp \|= 0x0080; /* per-port indicators (LEDs) */
	332	#endif
	333	desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
	334	}
	335
	336	/-------------------------------------------------------------------------/
	337
53bd6a60	338	#define PORT_WAKE_BITS (PORT_WKOC_E\|PORT_WKDISC_E\|PORT_WKCONN_E)
1da177e4 LT	339
	340	static int ehci_hub_control (
	341	struct usb_hcd *hcd,
	342	u16 typeReq,
	343	u16 wValue,
	344	u16 wIndex,
	345	char *buf,
	346	u16 wLength
	347	) {
	348	struct ehci_hcd *ehci = hcd_to_ehci (hcd);
	349	int ports = HCS_N_PORTS (ehci->hcs_params);
e6316565	350	u32 __iomem *status_reg = &ehci->regs->port_status[wIndex - 1];
1da177e4 LT	351	u32 temp, status;
	352	unsigned long flags;
	353	int retval = 0;
f0d7f273	354	unsigned selector;
1da177e4 LT	355
	356	/*
	357	* FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
	358	* HCS_INDICATOR may say we can change LEDs to off/amber/green.
	359	* (track current state ourselves) ... blink for diagnostics,
	360	* power, "this is the one", etc. EHCI spec supports this.
	361	*/
	362
	363	spin_lock_irqsave (&ehci->lock, flags);
	364	switch (typeReq) {
	365	case ClearHubFeature:
	366	switch (wValue) {
	367	case C_HUB_LOCAL_POWER:
	368	case C_HUB_OVER_CURRENT:
	369	/* no hub-wide feature/status flags */
	370	break;
	371	default:
	372	goto error;
	373	}
	374	break;
	375	case ClearPortFeature:
	376	if (!wIndex \|\| wIndex > ports)
	377	goto error;
	378	wIndex--;
e6316565	379	temp = ehci_readl(ehci, status_reg);
1da177e4 LT	380	if (temp & PORT_OWNER)
	381	break;
	382
	383	switch (wValue) {
	384	case USB_PORT_FEAT_ENABLE:
e6316565	385	ehci_writel(ehci, temp & ~PORT_PE, status_reg);
1da177e4 LT	386	break;
1da177e4 LT	387	case USB_PORT_FEAT_C_ENABLE:
083522d7	388	ehci_writel(ehci, (temp & ~PORT_RWC_BITS) \| PORT_PEC,
e6316565	389	status_reg);
1da177e4 LT	390	break;
	391	case USB_PORT_FEAT_SUSPEND:
	392	if (temp & PORT_RESET)
	393	goto error;
f8aeb3bb DB	394	if (ehci->no_selective_suspend)
f8aeb3bb DB	395	break;
1da177e4 LT	396	if (temp & PORT_SUSPEND) {
	397	if ((temp & PORT_PE) == 0)
	398	goto error;
	399	/* resume signaling for 20 msec */
10f6524a	400	temp &= ~(PORT_RWC_BITS \| PORT_WAKE_BITS);
083522d7	401	ehci_writel(ehci, temp \| PORT_RESUME,
e6316565	402	status_reg);
1da177e4 LT	403	ehci->reset_done [wIndex] = jiffies
	404	+ msecs_to_jiffies (20);
	405	}
	406	break;
	407	case USB_PORT_FEAT_C_SUSPEND:
	408	/* we auto-clear this feature */
	409	break;
	410	case USB_PORT_FEAT_POWER:
	411	if (HCS_PPC (ehci->hcs_params))
083522d7 BH	412	ehci_writel(ehci,
083522d7 BH	413	temp & ~(PORT_RWC_BITS \| PORT_POWER),
e6316565	414	status_reg);
1da177e4 LT	415	break;
1da177e4 LT	416	case USB_PORT_FEAT_C_CONNECTION:
083522d7	417	ehci_writel(ehci, (temp & ~PORT_RWC_BITS) \| PORT_CSC,
e6316565	418	status_reg);
1da177e4 LT	419	break;
1da177e4 LT	420	case USB_PORT_FEAT_C_OVER_CURRENT:
083522d7	421	ehci_writel(ehci, (temp & ~PORT_RWC_BITS) \| PORT_OCC,
e6316565	422	status_reg);
1da177e4 LT	423	break;
	424	case USB_PORT_FEAT_C_RESET:
	425	/* GetPortStatus clears reset */
	426	break;
	427	default:
	428	goto error;
	429	}
083522d7	430	ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
1da177e4 LT	431	break;
	432	case GetHubDescriptor:
	433	ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
	434	buf);
	435	break;
	436	case GetHubStatus:
	437	/* no hub-wide feature/status flags */
	438	memset (buf, 0, 4);
	439	//cpu_to_le32s ((u32 *) buf);
	440	break;
	441	case GetPortStatus:
	442	if (!wIndex \|\| wIndex > ports)
	443	goto error;
	444	wIndex--;
	445	status = 0;
e6316565	446	temp = ehci_readl(ehci, status_reg);
1da177e4 LT	447
	448	// wPortChange bits
	449	if (temp & PORT_CSC)
	450	status \|= 1 << USB_PORT_FEAT_C_CONNECTION;
	451	if (temp & PORT_PEC)
	452	status \|= 1 << USB_PORT_FEAT_C_ENABLE;
93f1a47c	453	if ((temp & PORT_OCC) && !ignore_oc)
1da177e4 LT	454	status \|= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
	455
	456	/* whoever resumes must GetPortStatus to complete it!! */
	457	if ((temp & PORT_RESUME)
	458	&& time_after (jiffies,
	459	ehci->reset_done [wIndex])) {
	460	status \|= 1 << USB_PORT_FEAT_C_SUSPEND;
	461	ehci->reset_done [wIndex] = 0;
	462
	463	/* stop resume signaling */
e6316565	464	temp = ehci_readl(ehci, status_reg);
083522d7	465	ehci_writel(ehci,
e6316565 AS	466	temp & ~(PORT_RWC_BITS \| PORT_RESUME),
	467	status_reg);
	468	retval = handshake(ehci, status_reg,
083522d7	469	PORT_RESUME, 0, 2000 /* 2msec */);
1da177e4 LT	470	if (retval != 0) {
	471	ehci_err (ehci, "port %d resume error %d\n",
	472	wIndex + 1, retval);
	473	goto error;
	474	}
	475	temp &= ~(PORT_SUSPEND\|PORT_RESUME\|(3<<10));
	476	}
	477
	478	/* whoever resets must GetPortStatus to complete it!! */
	479	if ((temp & PORT_RESET)
	480	&& time_after (jiffies,
	481	ehci->reset_done [wIndex])) {
	482	status \|= 1 << USB_PORT_FEAT_C_RESET;
	483	ehci->reset_done [wIndex] = 0;
	484
	485	/* force reset to complete */
083522d7	486	ehci_writel(ehci, temp & ~(PORT_RWC_BITS \| PORT_RESET),
e6316565	487	status_reg);
c22fa3ac DB	488	/* REVISIT: some hardware needs 550+ usec to clear
	489	* this bit; seems too long to spin routinely...
	490	*/
e6316565	491	retval = handshake(ehci, status_reg,
c22fa3ac	492	PORT_RESET, 0, 750);
1da177e4 LT	493	if (retval != 0) {
	494	ehci_err (ehci, "port %d reset error %d\n",
	495	wIndex + 1, retval);
	496	goto error;
	497	}
	498
	499	/* see what we found out */
e6316565 AS	500	temp = check_reset_complete (ehci, wIndex, status_reg,
e6316565 AS	501	ehci_readl(ehci, status_reg));
1da177e4 LT	502	}
	503
	504	// don't show wPortStatus if it's owned by a companion hc
	505	if (!(temp & PORT_OWNER)) {
	506	if (temp & PORT_CONNECT) {
	507	status \|= 1 << USB_PORT_FEAT_CONNECTION;
	508	// status may be from integrated TT
	509	status \|= ehci_port_speed(ehci, temp);
	510	}
	511	if (temp & PORT_PE)
	512	status \|= 1 << USB_PORT_FEAT_ENABLE;
	513	if (temp & (PORT_SUSPEND\|PORT_RESUME))
	514	status \|= 1 << USB_PORT_FEAT_SUSPEND;
	515	if (temp & PORT_OC)
	516	status \|= 1 << USB_PORT_FEAT_OVER_CURRENT;
	517	if (temp & PORT_RESET)
	518	status \|= 1 << USB_PORT_FEAT_RESET;
	519	if (temp & PORT_POWER)
	520	status \|= 1 << USB_PORT_FEAT_POWER;
	521	}
	522
	523	#ifndef EHCI_VERBOSE_DEBUG
	524	if (status & ~0xffff) /* only if wPortChange is interesting */
	525	#endif
	526	dbg_port (ehci, "GetStatus", wIndex + 1, temp);
	527	// we "know" this alignment is good, caller used kmalloc()...
	528	((__le32 ) buf) = cpu_to_le32 (status);
	529	break;
	530	case SetHubFeature:
	531	switch (wValue) {
	532	case C_HUB_LOCAL_POWER:
	533	case C_HUB_OVER_CURRENT:
	534	/* no hub-wide feature/status flags */
	535	break;
	536	default:
	537	goto error;
	538	}
	539	break;
	540	case SetPortFeature:
f0d7f273 DB	541	selector = wIndex >> 8;
f0d7f273 DB	542	wIndex &= 0xff;
1da177e4 LT	543	if (!wIndex \|\| wIndex > ports)
	544	goto error;
	545	wIndex--;
e6316565	546	temp = ehci_readl(ehci, status_reg);
1da177e4 LT	547	if (temp & PORT_OWNER)
	548	break;
	549
10f6524a	550	temp &= ~PORT_RWC_BITS;
1da177e4 LT	551	switch (wValue) {
1da177e4 LT	552	case USB_PORT_FEAT_SUSPEND:
f8aeb3bb DB	553	if (ehci->no_selective_suspend)
f8aeb3bb DB	554	break;
1da177e4 LT	555	if ((temp & PORT_PE) == 0
	556	\|\| (temp & PORT_RESET) != 0)
	557	goto error;
2c1c3c4c	558	if (device_may_wakeup(&hcd->self.root_hub->dev))
1da177e4	559	temp \|= PORT_WAKE_BITS;
e6316565	560	ehci_writel(ehci, temp \| PORT_SUSPEND, status_reg);
1da177e4 LT	561	break;
	562	case USB_PORT_FEAT_POWER:
	563	if (HCS_PPC (ehci->hcs_params))
083522d7	564	ehci_writel(ehci, temp \| PORT_POWER,
e6316565	565	status_reg);
1da177e4 LT	566	break;
	567	case USB_PORT_FEAT_RESET:
	568	if (temp & PORT_RESUME)
	569	goto error;
	570	/* line status bits may report this as low speed,
	571	* which can be fine if this root hub has a
	572	* transaction translator built in.
	573	*/
	574	if ((temp & (PORT_PE\|PORT_CONNECT)) == PORT_CONNECT
	575	&& !ehci_is_TDI(ehci)
	576	&& PORT_USB11 (temp)) {
	577	ehci_dbg (ehci,
	578	"port %d low speed --> companion\n",
	579	wIndex + 1);
	580	temp \|= PORT_OWNER;
	581	} else {
	582	ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
	583	temp \|= PORT_RESET;
	584	temp &= ~PORT_PE;
	585
	586	/*
	587	* caller must wait, then call GetPortStatus
	588	* usb 2.0 spec says 50 ms resets on root
	589	*/
	590	ehci->reset_done [wIndex] = jiffies
	591	+ msecs_to_jiffies (50);
	592	}
e6316565	593	ehci_writel(ehci, temp, status_reg);
1da177e4	594	break;
f0d7f273 DB	595
	596	/* For downstream facing ports (these): one hub port is put
	597	* into test mode according to USB2 11.24.2.13, then the hub
	598	* must be reset (which for root hub now means rmmod+modprobe,
	599	* or else system reboot). See EHCI 2.3.9 and 4.14 for info
	600	* about the EHCI-specific stuff.
	601	*/
	602	case USB_PORT_FEAT_TEST:
	603	if (!selector \|\| selector > 5)
	604	goto error;
	605	ehci_quiesce(ehci);
	606	ehci_halt(ehci);
	607	temp \|= selector << 16;
e6316565	608	ehci_writel(ehci, temp, status_reg);
f0d7f273 DB	609	break;
f0d7f273 DB	610
1da177e4 LT	611	default:
	612	goto error;
	613	}
083522d7	614	ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
1da177e4 LT	615	break;
	616
	617	default:
	618	error:
	619	/* "stall" on error */
	620	retval = -EPIPE;
	621	}
	622	spin_unlock_irqrestore (&ehci->lock, flags);
	623	return retval;
	624	}