[deliverable/linux.git] / drivers / usb / musb / musb_virthub.c

/*
 * MUSB OTG driver virtual root hub support
 *
 * Copyright 2005 Mentor Graphics Corporation
 * Copyright (C) 2005-2006 by Texas Instruments
 * Copyright (C) 2006-2007 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/timer.h>

#include <asm/unaligned.h>

#include "musb_core.h"

void musb_host_finish_resume(struct work_struct *work)
{
	struct musb *musb;
	unsigned long flags;
	u8 power;

	musb = container_of(work, struct musb, finish_resume_work.work);

	spin_lock_irqsave(&musb->lock, flags);

	power = musb_readb(musb->mregs, MUSB_POWER);
	power &= ~MUSB_POWER_RESUME;
	dev_dbg(musb->controller, "root port resume stopped, power %02x\n",
		power);
	musb_writeb(musb->mregs, MUSB_POWER, power);

	/*
	 * ISSUE:  DaVinci (RTL 1.300) disconnects after
	 * resume of high speed peripherals (but not full
	 * speed ones).
	 */
	musb->is_active = 1;
	musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME);
	musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
	usb_hcd_poll_rh_status(musb->hcd);
	/* NOTE: it might really be A_WAIT_BCON ... */
	musb->xceiv->otg->state = OTG_STATE_A_HOST;

	spin_unlock_irqrestore(&musb->lock, flags);
	musb_host_resume_root_hub(musb);
}

void musb_port_suspend(struct musb *musb, bool do_suspend)
{
	struct usb_otg	*otg = musb->xceiv->otg;
	u8		power;
	void __iomem	*mbase = musb->mregs;

	if (!is_host_active(musb))
		return;

	/* NOTE:  this doesn't necessarily put PHY into low power mode,
	 * turning off its clock; that's a function of PHY integration and
	 * MUSB_POWER_ENSUSPEND.  PHY may need a clock (sigh) to detect
	 * SE0 changing to connect (J) or wakeup (K) states.
	 */
	power = musb_readb(mbase, MUSB_POWER);
	if (do_suspend) {
		int retries = 10000;

		power &= ~MUSB_POWER_RESUME;
		power |= MUSB_POWER_SUSPENDM;
		musb_writeb(mbase, MUSB_POWER, power);

		/* Needed for OPT A tests */
		power = musb_readb(mbase, MUSB_POWER);
		while (power & MUSB_POWER_SUSPENDM) {
			power = musb_readb(mbase, MUSB_POWER);
			if (retries-- < 1)
				break;
		}

		dev_dbg(musb->controller, "Root port suspended, power %02x\n", power);

		musb->port1_status |= USB_PORT_STAT_SUSPEND;
		switch (musb->xceiv->otg->state) {
		case OTG_STATE_A_HOST:
			musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
			musb->is_active = otg->host->b_hnp_enable;
			if (musb->is_active)
				mod_timer(&musb->otg_timer, jiffies
					+ msecs_to_jiffies(
						OTG_TIME_A_AIDL_BDIS));
			musb_platform_try_idle(musb, 0);
			break;
		case OTG_STATE_B_HOST:
			musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
			musb->is_active = otg->host->b_hnp_enable;
			musb_platform_try_idle(musb, 0);
			break;
		default:
			dev_dbg(musb->controller, "bogus rh suspend? %s\n",
				usb_otg_state_string(musb->xceiv->otg->state));
		}
	} else if (power & MUSB_POWER_SUSPENDM) {
		power &= ~MUSB_POWER_SUSPENDM;
		power |= MUSB_POWER_RESUME;
		musb_writeb(mbase, MUSB_POWER, power);

		dev_dbg(musb->controller, "Root port resuming, power %02x\n", power);

		/* later, GetPortStatus will stop RESUME signaling */
		musb->port1_status |= MUSB_PORT_STAT_RESUME;
		schedule_delayed_work(&musb->finish_resume_work,
				      msecs_to_jiffies(20));
	}
}

void musb_port_reset(struct musb *musb, bool do_reset)
{
	u8		power;
	void __iomem	*mbase = musb->mregs;

	if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
		dev_dbg(musb->controller, "HNP: Returning from HNP; no hub reset from b_idle\n");
		musb->port1_status &= ~USB_PORT_STAT_RESET;
		return;
	}

	if (!is_host_active(musb))
		return;

	/* NOTE:  caller guarantees it will turn off the reset when
	 * the appropriate amount of time has passed
	 */
	power = musb_readb(mbase, MUSB_POWER);
	if (do_reset) {
		/*
		 * If RESUME is set, we must make sure it stays minimum 20 ms.
		 * Then we must clear RESUME and wait a bit to let musb start
		 * generating SOFs. If we don't do this, OPT HS A 6.8 tests
		 * fail with "Error! Did not receive an SOF before suspend
		 * detected".
		 */
		if (power &  MUSB_POWER_RESUME) {
			long remain = (unsigned long) musb->rh_timer - jiffies;

			if (musb->rh_timer > 0 && remain > 0) {
				/* take into account the minimum delay after resume */
				schedule_delayed_work(
					&musb->deassert_reset_work, remain);
				return;
			}

			musb_writeb(mbase, MUSB_POWER,
				    power & ~MUSB_POWER_RESUME);

			/* Give the core 1 ms to clear MUSB_POWER_RESUME */
			schedule_delayed_work(&musb->deassert_reset_work,
					      msecs_to_jiffies(1));
			return;
		}

		power &= 0xf0;
		musb_writeb(mbase, MUSB_POWER,
				power | MUSB_POWER_RESET);

		musb->port1_status |= USB_PORT_STAT_RESET;
		musb->port1_status &= ~USB_PORT_STAT_ENABLE;
		schedule_delayed_work(&musb->deassert_reset_work,
				      msecs_to_jiffies(50));
	} else {
		dev_dbg(musb->controller, "root port reset stopped\n");
		musb_writeb(mbase, MUSB_POWER,
				power & ~MUSB_POWER_RESET);

		power = musb_readb(mbase, MUSB_POWER);
		if (power & MUSB_POWER_HSMODE) {
			dev_dbg(musb->controller, "high-speed device connected\n");
			musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
		}

		musb->port1_status &= ~USB_PORT_STAT_RESET;
		musb->port1_status |= USB_PORT_STAT_ENABLE
					| (USB_PORT_STAT_C_RESET << 16)
					| (USB_PORT_STAT_C_ENABLE << 16);
		usb_hcd_poll_rh_status(musb->hcd);

		musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
	}
}

void musb_root_disconnect(struct musb *musb)
{
	struct usb_otg	*otg = musb->xceiv->otg;

	musb->port1_status = USB_PORT_STAT_POWER
			| (USB_PORT_STAT_C_CONNECTION << 16);

	usb_hcd_poll_rh_status(musb->hcd);
	musb->is_active = 0;

	switch (musb->xceiv->otg->state) {
	case OTG_STATE_A_SUSPEND:
		if (otg->host->b_hnp_enable) {
			musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
			musb->g.is_a_peripheral = 1;
			break;
		}
		/* FALLTHROUGH */
	case OTG_STATE_A_HOST:
		musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
		musb->is_active = 0;
		break;
	case OTG_STATE_A_WAIT_VFALL:
		musb->xceiv->otg->state = OTG_STATE_B_IDLE;
		break;
	default:
		dev_dbg(musb->controller, "host disconnect (%s)\n",
			usb_otg_state_string(musb->xceiv->otg->state));
	}
}


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

/* Caller may or may not hold musb->lock */
int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
{
	struct musb	*musb = hcd_to_musb(hcd);
	int		retval = 0;

	/* called in_irq() via usb_hcd_poll_rh_status() */
	if (musb->port1_status & 0xffff0000) {
		*buf = 0x02;
		retval = 1;
	}
	return retval;
}

static int musb_has_gadget(struct musb *musb)
{
	/*
	 * In host-only mode we start a connection right away. In OTG mode
	 * we have to wait until we loaded a gadget. We don't really need a
	 * gadget if we operate as a host but we should not start a session
	 * as a device without a gadget or else we explode.
	 */
#ifdef CONFIG_USB_MUSB_HOST
	return 1;
#else
	if (musb->port_mode == MUSB_PORT_MODE_HOST)
		return 1;
	return musb->g.dev.driver != NULL;
#endif
}

int musb_hub_control(
	struct usb_hcd	*hcd,
	u16		typeReq,
	u16		wValue,
	u16		wIndex,
	char		*buf,
	u16		wLength)
{
	struct musb	*musb = hcd_to_musb(hcd);
	u32		temp;
	int		retval = 0;
	unsigned long	flags;

	spin_lock_irqsave(&musb->lock, flags);

	if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
		spin_unlock_irqrestore(&musb->lock, flags);
		return -ESHUTDOWN;
	}

	/* hub features:  always zero, setting is a NOP
	 * port features: reported, sometimes updated when host is active
	 * no indicators
	 */
	switch (typeReq) {
	case ClearHubFeature:
	case SetHubFeature:
		switch (wValue) {
		case C_HUB_OVER_CURRENT:
		case C_HUB_LOCAL_POWER:
			break;
		default:
			goto error;
		}
		break;
	case ClearPortFeature:
		if ((wIndex & 0xff) != 1)
			goto error;

		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
			break;
		case USB_PORT_FEAT_SUSPEND:
			musb_port_suspend(musb, false);
			break;
		case USB_PORT_FEAT_POWER:
			if (!hcd->self.is_b_host)
				musb_platform_set_vbus(musb, 0);
			break;
		case USB_PORT_FEAT_C_CONNECTION:
		case USB_PORT_FEAT_C_ENABLE:
		case USB_PORT_FEAT_C_OVER_CURRENT:
		case USB_PORT_FEAT_C_RESET:
		case USB_PORT_FEAT_C_SUSPEND:
			break;
		default:
			goto error;
		}
		dev_dbg(musb->controller, "clear feature %d\n", wValue);
		musb->port1_status &= ~(1 << wValue);
		break;
	case GetHubDescriptor:
		{
		struct usb_hub_descriptor *desc = (void *)buf;

		desc->bDescLength = 9;
		desc->bDescriptorType = 0x29;
		desc->bNbrPorts = 1;
		desc->wHubCharacteristics = cpu_to_le16(
				  0x0001	/* per-port power switching */
				| 0x0010	/* no overcurrent reporting */
				);
		desc->bPwrOn2PwrGood = 5;	/* msec/2 */
		desc->bHubContrCurrent = 0;

		/* workaround bogus struct definition */
		desc->u.hs.DeviceRemovable[0] = 0x02;	/* port 1 */
		desc->u.hs.DeviceRemovable[1] = 0xff;
		}
		break;
	case GetHubStatus:
		temp = 0;
		*(__le32 *) buf = cpu_to_le32(temp);
		break;
	case GetPortStatus:
		if (wIndex != 1)
			goto error;

		put_unaligned(cpu_to_le32(musb->port1_status
					& ~MUSB_PORT_STAT_RESUME),
				(__le32 *) buf);

		/* port change status is more interesting */
		dev_dbg(musb->controller, "port status %08x\n",
				musb->port1_status);
		break;
	case SetPortFeature:
		if ((wIndex & 0xff) != 1)
			goto error;

		switch (wValue) {
		case USB_PORT_FEAT_POWER:
			/* NOTE: this controller has a strange state machine
			 * that involves "requesting sessions" according to
			 * magic side effects from incompletely-described
			 * rules about startup...
			 *
			 * This call is what really starts the host mode; be
			 * very careful about side effects if you reorder any
			 * initialization logic, e.g. for OTG, or change any
			 * logic relating to VBUS power-up.
			 */
			if (!hcd->self.is_b_host && musb_has_gadget(musb))
				musb_start(musb);
			break;
		case USB_PORT_FEAT_RESET:
			musb_port_reset(musb, true);
			break;
		case USB_PORT_FEAT_SUSPEND:
			musb_port_suspend(musb, true);
			break;
		case USB_PORT_FEAT_TEST:
			if (unlikely(is_host_active(musb)))
				goto error;

			wIndex >>= 8;
			switch (wIndex) {
			case 1:
				pr_debug("TEST_J\n");
				temp = MUSB_TEST_J;
				break;
			case 2:
				pr_debug("TEST_K\n");
				temp = MUSB_TEST_K;
				break;
			case 3:
				pr_debug("TEST_SE0_NAK\n");
				temp = MUSB_TEST_SE0_NAK;
				break;
			case 4:
				pr_debug("TEST_PACKET\n");
				temp = MUSB_TEST_PACKET;
				musb_load_testpacket(musb);
				break;
			case 5:
				pr_debug("TEST_FORCE_ENABLE\n");
				temp = MUSB_TEST_FORCE_HOST
					| MUSB_TEST_FORCE_HS;

				musb_writeb(musb->mregs, MUSB_DEVCTL,
						MUSB_DEVCTL_SESSION);
				break;
			case 6:
				pr_debug("TEST_FIFO_ACCESS\n");
				temp = MUSB_TEST_FIFO_ACCESS;
				break;
			default:
				goto error;
			}
			musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
			break;
		default:
			goto error;
		}
		dev_dbg(musb->controller, "set feature %d\n", wValue);
		musb->port1_status |= 1 << wValue;
		break;

	default:
error:
		/* "protocol stall" on error */
		retval = -EPIPE;
	}
	spin_unlock_irqrestore(&musb->lock, flags);
	return retval;
}
Commit	Line	Data
550a7375 FB	1	/*
	2	* MUSB OTG driver virtual root hub support
	3	*
	4	* Copyright 2005 Mentor Graphics Corporation
	5	* Copyright (C) 2005-2006 by Texas Instruments
	6	* Copyright (C) 2006-2007 Nokia Corporation
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
	25	* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	26	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	27	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	28	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
	29	* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	30	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	31	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	32	*
	33	*/
	34
	35	#include <linux/module.h>
	36	#include <linux/kernel.h>
	37	#include <linux/sched.h>
550a7375	38	#include <linux/errno.h>
550a7375 FB	39	#include <linux/time.h>
	40	#include <linux/timer.h>
	41
	42	#include <asm/unaligned.h>
	43
	44	#include "musb_core.h"
	45
8ed1fb79 DM	46	void musb_host_finish_resume(struct work_struct *work)
	47	{
	48	struct musb *musb;
	49	unsigned long flags;
	50	u8 power;
	51
fa6997d3	52	musb = container_of(work, struct musb, finish_resume_work.work);
8ed1fb79 DM	53
	54	spin_lock_irqsave(&musb->lock, flags);
	55
	56	power = musb_readb(musb->mregs, MUSB_POWER);
	57	power &= ~MUSB_POWER_RESUME;
	58	dev_dbg(musb->controller, "root port resume stopped, power %02x\n",
	59	power);
	60	musb_writeb(musb->mregs, MUSB_POWER, power);
	61
	62	/*
	63	* ISSUE: DaVinci (RTL 1.300) disconnects after
	64	* resume of high speed peripherals (but not full
	65	* speed ones).
	66	*/
	67	musb->is_active = 1;
	68	musb->port1_status &= ~(USB_PORT_STAT_SUSPEND \| MUSB_PORT_STAT_RESUME);
	69	musb->port1_status \|= USB_PORT_STAT_C_SUSPEND << 16;
	70	usb_hcd_poll_rh_status(musb->hcd);
	71	/* NOTE: it might really be A_WAIT_BCON ... */
e47d9254	72	musb->xceiv->otg->state = OTG_STATE_A_HOST;
8ed1fb79 DM	73
8ed1fb79 DM	74	spin_unlock_irqrestore(&musb->lock, flags);
baadd52f	75	musb_host_resume_root_hub(musb);
8ed1fb79 DM	76	}
8ed1fb79 DM	77
94f72136	78	void musb_port_suspend(struct musb *musb, bool do_suspend)
550a7375	79	{
d445b6da	80	struct usb_otg *otg = musb->xceiv->otg;
550a7375 FB	81	u8 power;
	82	void __iomem *mbase = musb->mregs;
	83
	84	if (!is_host_active(musb))
	85	return;
	86
	87	/* NOTE: this doesn't necessarily put PHY into low power mode,
	88	* turning off its clock; that's a function of PHY integration and
	89	* MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
	90	* SE0 changing to connect (J) or wakeup (K) states.
	91	*/
	92	power = musb_readb(mbase, MUSB_POWER);
	93	if (do_suspend) {
	94	int retries = 10000;
	95
	96	power &= ~MUSB_POWER_RESUME;
	97	power \|= MUSB_POWER_SUSPENDM;
	98	musb_writeb(mbase, MUSB_POWER, power);
	99
	100	/* Needed for OPT A tests */
	101	power = musb_readb(mbase, MUSB_POWER);
	102	while (power & MUSB_POWER_SUSPENDM) {
	103	power = musb_readb(mbase, MUSB_POWER);
	104	if (retries-- < 1)
	105	break;
	106	}
	107
5c8a86e1	108	dev_dbg(musb->controller, "Root port suspended, power %02x\n", power);
550a7375 FB	109
550a7375 FB	110	musb->port1_status \|= USB_PORT_STAT_SUSPEND;
e47d9254	111	switch (musb->xceiv->otg->state) {
550a7375	112	case OTG_STATE_A_HOST:
e47d9254	113	musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
032ec49f	114	musb->is_active = otg->host->b_hnp_enable;
ab983f2a DB	115	if (musb->is_active)
	116	mod_timer(&musb->otg_timer, jiffies
	117	+ msecs_to_jiffies(
	118	OTG_TIME_A_AIDL_BDIS));
550a7375 FB	119	musb_platform_try_idle(musb, 0);
550a7375 FB	120	break;
550a7375	121	case OTG_STATE_B_HOST:
e47d9254	122	musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
032ec49f	123	musb->is_active = otg->host->b_hnp_enable;
550a7375 FB	124	musb_platform_try_idle(musb, 0);
550a7375 FB	125	break;
550a7375	126	default:
5c8a86e1	127	dev_dbg(musb->controller, "bogus rh suspend? %s\n",
e47d9254	128	usb_otg_state_string(musb->xceiv->otg->state));
550a7375 FB	129	}
	130	} else if (power & MUSB_POWER_SUSPENDM) {
	131	power &= ~MUSB_POWER_SUSPENDM;
	132	power \|= MUSB_POWER_RESUME;
	133	musb_writeb(mbase, MUSB_POWER, power);
	134
5c8a86e1	135	dev_dbg(musb->controller, "Root port resuming, power %02x\n", power);
550a7375 FB	136
	137	/* later, GetPortStatus will stop RESUME signaling */
	138	musb->port1_status \|= MUSB_PORT_STAT_RESUME;
f2dece44 DM	139	schedule_delayed_work(&musb->finish_resume_work,
f2dece44 DM	140	msecs_to_jiffies(20));
550a7375 FB	141	}
	142	}
	143
869c5978	144	void musb_port_reset(struct musb *musb, bool do_reset)
550a7375 FB	145	{
	146	u8 power;
	147	void __iomem *mbase = musb->mregs;
	148
e47d9254	149	if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
5c8a86e1	150	dev_dbg(musb->controller, "HNP: Returning from HNP; no hub reset from b_idle\n");
550a7375 FB	151	musb->port1_status &= ~USB_PORT_STAT_RESET;
	152	return;
	153	}
550a7375 FB	154
	155	if (!is_host_active(musb))
	156	return;
	157
	158	/* NOTE: caller guarantees it will turn off the reset when
	159	* the appropriate amount of time has passed
	160	*/
	161	power = musb_readb(mbase, MUSB_POWER);
	162	if (do_reset) {
550a7375 FB	163	/*
	164	* If RESUME is set, we must make sure it stays minimum 20 ms.
	165	* Then we must clear RESUME and wait a bit to let musb start
	166	* generating SOFs. If we don't do this, OPT HS A 6.8 tests
	167	* fail with "Error! Did not receive an SOF before suspend
	168	* detected".
	169	*/
	170	if (power & MUSB_POWER_RESUME) {
73926db3 DM	171	long remain = (unsigned long) musb->rh_timer - jiffies;
	172
	173	if (musb->rh_timer > 0 && remain > 0) {
	174	/* take into account the minimum delay after resume */
	175	schedule_delayed_work(
f2dece44	176	&musb->deassert_reset_work, remain);
73926db3 DM	177	return;
	178	}
	179
550a7375	180	musb_writeb(mbase, MUSB_POWER,
73926db3 DM	181	power & ~MUSB_POWER_RESUME);
	182
	183	/* Give the core 1 ms to clear MUSB_POWER_RESUME */
f2dece44 DM	184	schedule_delayed_work(&musb->deassert_reset_work,
f2dece44 DM	185	msecs_to_jiffies(1));
73926db3	186	return;
550a7375 FB	187	}
550a7375 FB	188
550a7375 FB	189	power &= 0xf0;
	190	musb_writeb(mbase, MUSB_POWER,
	191	power \| MUSB_POWER_RESET);
	192
	193	musb->port1_status \|= USB_PORT_STAT_RESET;
	194	musb->port1_status &= ~USB_PORT_STAT_ENABLE;
f2dece44 DM	195	schedule_delayed_work(&musb->deassert_reset_work,
f2dece44 DM	196	msecs_to_jiffies(50));
550a7375	197	} else {
5c8a86e1	198	dev_dbg(musb->controller, "root port reset stopped\n");
550a7375 FB	199	musb_writeb(mbase, MUSB_POWER,
	200	power & ~MUSB_POWER_RESET);
	201
550a7375 FB	202	power = musb_readb(mbase, MUSB_POWER);
550a7375 FB	203	if (power & MUSB_POWER_HSMODE) {
5c8a86e1	204	dev_dbg(musb->controller, "high-speed device connected\n");
550a7375 FB	205	musb->port1_status \|= USB_PORT_STAT_HIGH_SPEED;
	206	}
	207
	208	musb->port1_status &= ~USB_PORT_STAT_RESET;
	209	musb->port1_status \|= USB_PORT_STAT_ENABLE
	210	\| (USB_PORT_STAT_C_RESET << 16)
	211	\| (USB_PORT_STAT_C_ENABLE << 16);
8b125df5	212	usb_hcd_poll_rh_status(musb->hcd);
550a7375 FB	213
	214	musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
	215	}
	216	}
	217
	218	void musb_root_disconnect(struct musb *musb)
	219	{
d445b6da HK	220	struct usb_otg *otg = musb->xceiv->otg;
d445b6da HK	221
749da5f8 AS	222	musb->port1_status = USB_PORT_STAT_POWER
749da5f8 AS	223	\| (USB_PORT_STAT_C_CONNECTION << 16);
550a7375	224
8b125df5	225	usb_hcd_poll_rh_status(musb->hcd);
550a7375 FB	226	musb->is_active = 0;
550a7375 FB	227
e47d9254	228	switch (musb->xceiv->otg->state) {
550a7375	229	case OTG_STATE_A_SUSPEND:
032ec49f	230	if (otg->host->b_hnp_enable) {
e47d9254	231	musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
1de00dae DB	232	musb->g.is_a_peripheral = 1;
	233	break;
	234	}
1de00dae DB	235	/* FALLTHROUGH */
1de00dae DB	236	case OTG_STATE_A_HOST:
e47d9254	237	musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
550a7375 FB	238	musb->is_active = 0;
	239	break;
	240	case OTG_STATE_A_WAIT_VFALL:
e47d9254	241	musb->xceiv->otg->state = OTG_STATE_B_IDLE;
550a7375 FB	242	break;
550a7375 FB	243	default:
5c8a86e1	244	dev_dbg(musb->controller, "host disconnect (%s)\n",
e47d9254	245	usb_otg_state_string(musb->xceiv->otg->state));
550a7375 FB	246	}
	247	}
	248
	249
	250	/---------------------------------------------------------------------/
	251
	252	/* Caller may or may not hold musb->lock */
	253	int musb_hub_status_data(struct usb_hcd hcd, char buf)
	254	{
	255	struct musb *musb = hcd_to_musb(hcd);
	256	int retval = 0;
	257
	258	/* called in_irq() via usb_hcd_poll_rh_status() */
	259	if (musb->port1_status & 0xffff0000) {
	260	*buf = 0x02;
	261	retval = 1;
	262	}
	263	return retval;
	264	}
	265
ae44df2e SAS	266	static int musb_has_gadget(struct musb *musb)
	267	{
	268	/*
	269	* In host-only mode we start a connection right away. In OTG mode
	270	* we have to wait until we loaded a gadget. We don't really need a
	271	* gadget if we operate as a host but we should not start a session
	272	* as a device without a gadget or else we explode.
	273	*/
	274	#ifdef CONFIG_USB_MUSB_HOST
	275	return 1;
	276	#else
	277	if (musb->port_mode == MUSB_PORT_MODE_HOST)
	278	return 1;
	279	return musb->g.dev.driver != NULL;
	280	#endif
	281	}
	282
550a7375 FB	283	int musb_hub_control(
	284	struct usb_hcd *hcd,
	285	u16 typeReq,
	286	u16 wValue,
	287	u16 wIndex,
	288	char *buf,
	289	u16 wLength)
	290	{
	291	struct musb *musb = hcd_to_musb(hcd);
	292	u32 temp;
	293	int retval = 0;
	294	unsigned long flags;
	295
	296	spin_lock_irqsave(&musb->lock, flags);
	297
541c7d43	298	if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
550a7375 FB	299	spin_unlock_irqrestore(&musb->lock, flags);
	300	return -ESHUTDOWN;
	301	}
	302
	303	/* hub features: always zero, setting is a NOP
	304	* port features: reported, sometimes updated when host is active
	305	* no indicators
	306	*/
	307	switch (typeReq) {
	308	case ClearHubFeature:
	309	case SetHubFeature:
	310	switch (wValue) {
	311	case C_HUB_OVER_CURRENT:
	312	case C_HUB_LOCAL_POWER:
	313	break;
	314	default:
	315	goto error;
	316	}
	317	break;
	318	case ClearPortFeature:
	319	if ((wIndex & 0xff) != 1)
	320	goto error;
	321
	322	switch (wValue) {
	323	case USB_PORT_FEAT_ENABLE:
	324	break;
	325	case USB_PORT_FEAT_SUSPEND:
	326	musb_port_suspend(musb, false);
	327	break;
	328	case USB_PORT_FEAT_POWER:
032ec49f	329	if (!hcd->self.is_b_host)
743411b3	330	musb_platform_set_vbus(musb, 0);
550a7375 FB	331	break;
	332	case USB_PORT_FEAT_C_CONNECTION:
	333	case USB_PORT_FEAT_C_ENABLE:
	334	case USB_PORT_FEAT_C_OVER_CURRENT:
	335	case USB_PORT_FEAT_C_RESET:
	336	case USB_PORT_FEAT_C_SUSPEND:
	337	break;
	338	default:
	339	goto error;
	340	}
5c8a86e1	341	dev_dbg(musb->controller, "clear feature %d\n", wValue);
550a7375 FB	342	musb->port1_status &= ~(1 << wValue);
	343	break;
	344	case GetHubDescriptor:
	345	{
	346	struct usb_hub_descriptor desc = (void )buf;
	347
	348	desc->bDescLength = 9;
	349	desc->bDescriptorType = 0x29;
	350	desc->bNbrPorts = 1;
551509d2	351	desc->wHubCharacteristics = cpu_to_le16(
550a7375 FB	352	0x0001 /* per-port power switching */
	353	\| 0x0010 /* no overcurrent reporting */
	354	);
	355	desc->bPwrOn2PwrGood = 5; /* msec/2 */
	356	desc->bHubContrCurrent = 0;
	357
	358	/* workaround bogus struct definition */
dbe79bbe JY	359	desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
dbe79bbe JY	360	desc->u.hs.DeviceRemovable[1] = 0xff;
550a7375 FB	361	}
	362	break;
	363	case GetHubStatus:
	364	temp = 0;
	365	(__le32 ) buf = cpu_to_le32(temp);
	366	break;
	367	case GetPortStatus:
	368	if (wIndex != 1)
	369	goto error;
	370
550a7375 FB	371	put_unaligned(cpu_to_le32(musb->port1_status
	372	& ~MUSB_PORT_STAT_RESUME),
	373	(__le32 *) buf);
	374
	375	/* port change status is more interesting */
5c8a86e1	376	dev_dbg(musb->controller, "port status %08x\n",
550a7375 FB	377	musb->port1_status);
	378	break;
	379	case SetPortFeature:
	380	if ((wIndex & 0xff) != 1)
	381	goto error;
	382
	383	switch (wValue) {
	384	case USB_PORT_FEAT_POWER:
	385	/* NOTE: this controller has a strange state machine
	386	* that involves "requesting sessions" according to
	387	* magic side effects from incompletely-described
	388	* rules about startup...
	389	*
	390	* This call is what really starts the host mode; be
	391	* very careful about side effects if you reorder any
	392	* initialization logic, e.g. for OTG, or change any
	393	* logic relating to VBUS power-up.
	394	*/
ae44df2e	395	if (!hcd->self.is_b_host && musb_has_gadget(musb))
550a7375 FB	396	musb_start(musb);
	397	break;
	398	case USB_PORT_FEAT_RESET:
	399	musb_port_reset(musb, true);
	400	break;
	401	case USB_PORT_FEAT_SUSPEND:
	402	musb_port_suspend(musb, true);
	403	break;
	404	case USB_PORT_FEAT_TEST:
	405	if (unlikely(is_host_active(musb)))
	406	goto error;
	407
	408	wIndex >>= 8;
	409	switch (wIndex) {
	410	case 1:
	411	pr_debug("TEST_J\n");
	412	temp = MUSB_TEST_J;
	413	break;
	414	case 2:
	415	pr_debug("TEST_K\n");
	416	temp = MUSB_TEST_K;
	417	break;
	418	case 3:
	419	pr_debug("TEST_SE0_NAK\n");
	420	temp = MUSB_TEST_SE0_NAK;
	421	break;
	422	case 4:
	423	pr_debug("TEST_PACKET\n");
	424	temp = MUSB_TEST_PACKET;
	425	musb_load_testpacket(musb);
	426	break;
	427	case 5:
	428	pr_debug("TEST_FORCE_ENABLE\n");
	429	temp = MUSB_TEST_FORCE_HOST
	430	\| MUSB_TEST_FORCE_HS;
	431
	432	musb_writeb(musb->mregs, MUSB_DEVCTL,
	433	MUSB_DEVCTL_SESSION);
	434	break;
	435	case 6:
	436	pr_debug("TEST_FIFO_ACCESS\n");
	437	temp = MUSB_TEST_FIFO_ACCESS;
	438	break;
	439	default:
	440	goto error;
	441	}
	442	musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
	443	break;
	444	default:
	445	goto error;
	446	}
5c8a86e1	447	dev_dbg(musb->controller, "set feature %d\n", wValue);
550a7375 FB	448	musb->port1_status \|= 1 << wValue;
	449	break;
	450
	451	default:
	452	error:
	453	/* "protocol stall" on error */
	454	retval = -EPIPE;
	455	}
	456	spin_unlock_irqrestore(&musb->lock, flags);
	457	return retval;
	458	}