[linux-2.6-block.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);
}

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(USB_RESUME_TIMEOUT));
	}
}

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_platform_pre_root_reset_end(musb);
		musb_writeb(mbase, MUSB_POWER,
				power & ~MUSB_POWER_RESET);
		musb_platform_post_root_reset_end(musb);

		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
	return musb->port_mode == MUSB_PORT_MODE_HOST;
#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 = USB_DT_HUB;
		desc->bNbrPorts = 1;
		desc->wHubCharacteristics = cpu_to_le16(
			HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
			| HUB_CHAR_NO_OCPM	/* 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
	74	spin_unlock_irqrestore(&musb->lock, flags);
	75	}
	76
94f72136	77	void musb_port_suspend(struct musb *musb, bool do_suspend)
550a7375	78	{
d445b6da	79	struct usb_otg *otg = musb->xceiv->otg;
550a7375 FB	80	u8 power;
	81	void __iomem *mbase = musb->mregs;
	82
	83	if (!is_host_active(musb))
	84	return;
	85
	86	/* NOTE: this doesn't necessarily put PHY into low power mode,
	87	* turning off its clock; that's a function of PHY integration and
	88	* MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
	89	* SE0 changing to connect (J) or wakeup (K) states.
	90	*/
	91	power = musb_readb(mbase, MUSB_POWER);
	92	if (do_suspend) {
	93	int retries = 10000;
	94
	95	power &= ~MUSB_POWER_RESUME;
	96	power \|= MUSB_POWER_SUSPENDM;
	97	musb_writeb(mbase, MUSB_POWER, power);
	98
	99	/* Needed for OPT A tests */
	100	power = musb_readb(mbase, MUSB_POWER);
	101	while (power & MUSB_POWER_SUSPENDM) {
	102	power = musb_readb(mbase, MUSB_POWER);
	103	if (retries-- < 1)
	104	break;
	105	}
	106
5c8a86e1	107	dev_dbg(musb->controller, "Root port suspended, power %02x\n", power);
550a7375 FB	108
550a7375 FB	109	musb->port1_status \|= USB_PORT_STAT_SUSPEND;
e47d9254	110	switch (musb->xceiv->otg->state) {
550a7375	111	case OTG_STATE_A_HOST:
e47d9254	112	musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
032ec49f	113	musb->is_active = otg->host->b_hnp_enable;
ab983f2a DB	114	if (musb->is_active)
	115	mod_timer(&musb->otg_timer, jiffies
	116	+ msecs_to_jiffies(
	117	OTG_TIME_A_AIDL_BDIS));
550a7375 FB	118	musb_platform_try_idle(musb, 0);
550a7375 FB	119	break;
550a7375	120	case OTG_STATE_B_HOST:
e47d9254	121	musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
032ec49f	122	musb->is_active = otg->host->b_hnp_enable;
550a7375 FB	123	musb_platform_try_idle(musb, 0);
550a7375 FB	124	break;
550a7375	125	default:
5c8a86e1	126	dev_dbg(musb->controller, "bogus rh suspend? %s\n",
e47d9254	127	usb_otg_state_string(musb->xceiv->otg->state));
550a7375 FB	128	}
	129	} else if (power & MUSB_POWER_SUSPENDM) {
	130	power &= ~MUSB_POWER_SUSPENDM;
	131	power \|= MUSB_POWER_RESUME;
	132	musb_writeb(mbase, MUSB_POWER, power);
	133
5c8a86e1	134	dev_dbg(musb->controller, "Root port resuming, power %02x\n", power);
550a7375 FB	135
	136	/* later, GetPortStatus will stop RESUME signaling */
	137	musb->port1_status \|= MUSB_PORT_STAT_RESUME;
f2dece44	138	schedule_delayed_work(&musb->finish_resume_work,
309be239	139	msecs_to_jiffies(USB_RESUME_TIMEOUT));
550a7375 FB	140	}
	141	}
	142
869c5978	143	void musb_port_reset(struct musb *musb, bool do_reset)
550a7375 FB	144	{
	145	u8 power;
	146	void __iomem *mbase = musb->mregs;
	147
e47d9254	148	if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
5c8a86e1	149	dev_dbg(musb->controller, "HNP: Returning from HNP; no hub reset from b_idle\n");
550a7375 FB	150	musb->port1_status &= ~USB_PORT_STAT_RESET;
	151	return;
	152	}
550a7375 FB	153
	154	if (!is_host_active(musb))
	155	return;
	156
	157	/* NOTE: caller guarantees it will turn off the reset when
	158	* the appropriate amount of time has passed
	159	*/
	160	power = musb_readb(mbase, MUSB_POWER);
	161	if (do_reset) {
550a7375 FB	162	/*
	163	* If RESUME is set, we must make sure it stays minimum 20 ms.
	164	* Then we must clear RESUME and wait a bit to let musb start
	165	* generating SOFs. If we don't do this, OPT HS A 6.8 tests
	166	* fail with "Error! Did not receive an SOF before suspend
	167	* detected".
	168	*/
	169	if (power & MUSB_POWER_RESUME) {
73926db3 DM	170	long remain = (unsigned long) musb->rh_timer - jiffies;
	171
	172	if (musb->rh_timer > 0 && remain > 0) {
	173	/* take into account the minimum delay after resume */
	174	schedule_delayed_work(
f2dece44	175	&musb->deassert_reset_work, remain);
73926db3 DM	176	return;
	177	}
	178
550a7375	179	musb_writeb(mbase, MUSB_POWER,
73926db3 DM	180	power & ~MUSB_POWER_RESUME);
	181
	182	/* Give the core 1 ms to clear MUSB_POWER_RESUME */
f2dece44 DM	183	schedule_delayed_work(&musb->deassert_reset_work,
f2dece44 DM	184	msecs_to_jiffies(1));
73926db3	185	return;
550a7375 FB	186	}
550a7375 FB	187
550a7375 FB	188	power &= 0xf0;
	189	musb_writeb(mbase, MUSB_POWER,
	190	power \| MUSB_POWER_RESET);
	191
	192	musb->port1_status \|= USB_PORT_STAT_RESET;
	193	musb->port1_status &= ~USB_PORT_STAT_ENABLE;
f2dece44 DM	194	schedule_delayed_work(&musb->deassert_reset_work,
f2dece44 DM	195	msecs_to_jiffies(50));
550a7375	196	} else {
5c8a86e1	197	dev_dbg(musb->controller, "root port reset stopped\n");
591fa9dd	198	musb_platform_pre_root_reset_end(musb);
550a7375 FB	199	musb_writeb(mbase, MUSB_POWER,
550a7375 FB	200	power & ~MUSB_POWER_RESET);
591fa9dd	201	musb_platform_post_root_reset_end(musb);
550a7375	202
550a7375 FB	203	power = musb_readb(mbase, MUSB_POWER);
550a7375 FB	204	if (power & MUSB_POWER_HSMODE) {
5c8a86e1	205	dev_dbg(musb->controller, "high-speed device connected\n");
550a7375 FB	206	musb->port1_status \|= USB_PORT_STAT_HIGH_SPEED;
	207	}
	208
	209	musb->port1_status &= ~USB_PORT_STAT_RESET;
	210	musb->port1_status \|= USB_PORT_STAT_ENABLE
	211	\| (USB_PORT_STAT_C_RESET << 16)
	212	\| (USB_PORT_STAT_C_ENABLE << 16);
8b125df5	213	usb_hcd_poll_rh_status(musb->hcd);
550a7375 FB	214
	215	musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
	216	}
	217	}
	218
	219	void musb_root_disconnect(struct musb *musb)
	220	{
d445b6da HK	221	struct usb_otg *otg = musb->xceiv->otg;
d445b6da HK	222
749da5f8 AS	223	musb->port1_status = USB_PORT_STAT_POWER
749da5f8 AS	224	\| (USB_PORT_STAT_C_CONNECTION << 16);
550a7375	225
8b125df5	226	usb_hcd_poll_rh_status(musb->hcd);
550a7375 FB	227	musb->is_active = 0;
550a7375 FB	228
e47d9254	229	switch (musb->xceiv->otg->state) {
550a7375	230	case OTG_STATE_A_SUSPEND:
032ec49f	231	if (otg->host->b_hnp_enable) {
e47d9254	232	musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
1de00dae DB	233	musb->g.is_a_peripheral = 1;
	234	break;
	235	}
1de00dae DB	236	/* FALLTHROUGH */
1de00dae DB	237	case OTG_STATE_A_HOST:
e47d9254	238	musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
550a7375 FB	239	musb->is_active = 0;
	240	break;
	241	case OTG_STATE_A_WAIT_VFALL:
e47d9254	242	musb->xceiv->otg->state = OTG_STATE_B_IDLE;
550a7375 FB	243	break;
550a7375 FB	244	default:
5c8a86e1	245	dev_dbg(musb->controller, "host disconnect (%s)\n",
e47d9254	246	usb_otg_state_string(musb->xceiv->otg->state));
550a7375 FB	247	}
	248	}
	249
	250
	251	/---------------------------------------------------------------------/
	252
	253	/* Caller may or may not hold musb->lock */
	254	int musb_hub_status_data(struct usb_hcd hcd, char buf)
	255	{
	256	struct musb *musb = hcd_to_musb(hcd);
	257	int retval = 0;
	258
	259	/* called in_irq() via usb_hcd_poll_rh_status() */
	260	if (musb->port1_status & 0xffff0000) {
	261	*buf = 0x02;
	262	retval = 1;
	263	}
	264	return retval;
	265	}
	266
ae44df2e SAS	267	static int musb_has_gadget(struct musb *musb)
	268	{
	269	/*
	270	* In host-only mode we start a connection right away. In OTG mode
	271	* we have to wait until we loaded a gadget. We don't really need a
	272	* gadget if we operate as a host but we should not start a session
	273	* as a device without a gadget or else we explode.
	274	*/
	275	#ifdef CONFIG_USB_MUSB_HOST
	276	return 1;
	277	#else
be9d3988	278	return musb->port_mode == MUSB_PORT_MODE_HOST;
ae44df2e SAS	279	#endif
	280	}
	281
550a7375 FB	282	int musb_hub_control(
	283	struct usb_hcd *hcd,
	284	u16 typeReq,
	285	u16 wValue,
	286	u16 wIndex,
	287	char *buf,
	288	u16 wLength)
	289	{
	290	struct musb *musb = hcd_to_musb(hcd);
	291	u32 temp;
	292	int retval = 0;
	293	unsigned long flags;
	294
	295	spin_lock_irqsave(&musb->lock, flags);
	296
541c7d43	297	if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
550a7375 FB	298	spin_unlock_irqrestore(&musb->lock, flags);
	299	return -ESHUTDOWN;
	300	}
	301
	302	/* hub features: always zero, setting is a NOP
	303	* port features: reported, sometimes updated when host is active
	304	* no indicators
	305	*/
	306	switch (typeReq) {
	307	case ClearHubFeature:
	308	case SetHubFeature:
	309	switch (wValue) {
	310	case C_HUB_OVER_CURRENT:
	311	case C_HUB_LOCAL_POWER:
	312	break;
	313	default:
	314	goto error;
	315	}
	316	break;
	317	case ClearPortFeature:
	318	if ((wIndex & 0xff) != 1)
	319	goto error;
	320
	321	switch (wValue) {
	322	case USB_PORT_FEAT_ENABLE:
	323	break;
	324	case USB_PORT_FEAT_SUSPEND:
	325	musb_port_suspend(musb, false);
	326	break;
	327	case USB_PORT_FEAT_POWER:
032ec49f	328	if (!hcd->self.is_b_host)
743411b3	329	musb_platform_set_vbus(musb, 0);
550a7375 FB	330	break;
	331	case USB_PORT_FEAT_C_CONNECTION:
	332	case USB_PORT_FEAT_C_ENABLE:
	333	case USB_PORT_FEAT_C_OVER_CURRENT:
	334	case USB_PORT_FEAT_C_RESET:
	335	case USB_PORT_FEAT_C_SUSPEND:
	336	break;
	337	default:
	338	goto error;
	339	}
5c8a86e1	340	dev_dbg(musb->controller, "clear feature %d\n", wValue);
550a7375 FB	341	musb->port1_status &= ~(1 << wValue);
	342	break;
	343	case GetHubDescriptor:
	344	{
	345	struct usb_hub_descriptor desc = (void )buf;
	346
	347	desc->bDescLength = 9;
e95af3aa	348	desc->bDescriptorType = USB_DT_HUB;
550a7375	349	desc->bNbrPorts = 1;
551509d2	350	desc->wHubCharacteristics = cpu_to_le16(
c509ba6e SS	351	HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
	352	\| HUB_CHAR_NO_OCPM /* no overcurrent reporting */
	353	);
550a7375 FB	354	desc->bPwrOn2PwrGood = 5; /* msec/2 */
	355	desc->bHubContrCurrent = 0;
	356
	357	/* workaround bogus struct definition */
dbe79bbe JY	358	desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
dbe79bbe JY	359	desc->u.hs.DeviceRemovable[1] = 0xff;
550a7375 FB	360	}
	361	break;
	362	case GetHubStatus:
	363	temp = 0;
	364	(__le32 ) buf = cpu_to_le32(temp);
	365	break;
	366	case GetPortStatus:
	367	if (wIndex != 1)
	368	goto error;
	369
550a7375 FB	370	put_unaligned(cpu_to_le32(musb->port1_status
	371	& ~MUSB_PORT_STAT_RESUME),
	372	(__le32 *) buf);
	373
	374	/* port change status is more interesting */
5c8a86e1	375	dev_dbg(musb->controller, "port status %08x\n",
550a7375 FB	376	musb->port1_status);
	377	break;
	378	case SetPortFeature:
	379	if ((wIndex & 0xff) != 1)
	380	goto error;
	381
	382	switch (wValue) {
	383	case USB_PORT_FEAT_POWER:
	384	/* NOTE: this controller has a strange state machine
	385	* that involves "requesting sessions" according to
	386	* magic side effects from incompletely-described
	387	* rules about startup...
	388	*
	389	* This call is what really starts the host mode; be
	390	* very careful about side effects if you reorder any
	391	* initialization logic, e.g. for OTG, or change any
	392	* logic relating to VBUS power-up.
	393	*/
ae44df2e	394	if (!hcd->self.is_b_host && musb_has_gadget(musb))
550a7375 FB	395	musb_start(musb);
	396	break;
	397	case USB_PORT_FEAT_RESET:
	398	musb_port_reset(musb, true);
	399	break;
	400	case USB_PORT_FEAT_SUSPEND:
	401	musb_port_suspend(musb, true);
	402	break;
	403	case USB_PORT_FEAT_TEST:
	404	if (unlikely(is_host_active(musb)))
	405	goto error;
	406
	407	wIndex >>= 8;
	408	switch (wIndex) {
	409	case 1:
	410	pr_debug("TEST_J\n");
	411	temp = MUSB_TEST_J;
	412	break;
	413	case 2:
	414	pr_debug("TEST_K\n");
	415	temp = MUSB_TEST_K;
	416	break;
	417	case 3:
	418	pr_debug("TEST_SE0_NAK\n");
	419	temp = MUSB_TEST_SE0_NAK;
	420	break;
	421	case 4:
	422	pr_debug("TEST_PACKET\n");
	423	temp = MUSB_TEST_PACKET;
	424	musb_load_testpacket(musb);
	425	break;
	426	case 5:
	427	pr_debug("TEST_FORCE_ENABLE\n");
	428	temp = MUSB_TEST_FORCE_HOST
	429	\| MUSB_TEST_FORCE_HS;
	430
	431	musb_writeb(musb->mregs, MUSB_DEVCTL,
	432	MUSB_DEVCTL_SESSION);
	433	break;
	434	case 6:
	435	pr_debug("TEST_FIFO_ACCESS\n");
	436	temp = MUSB_TEST_FIFO_ACCESS;
	437	break;
	438	default:
	439	goto error;
	440	}
	441	musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
	442	break;
	443	default:
	444	goto error;
	445	}
5c8a86e1	446	dev_dbg(musb->controller, "set feature %d\n", wValue);
550a7375 FB	447	musb->port1_status \|= 1 << wValue;
	448	break;
	449
	450	default:
	451	error:
	452	/* "protocol stall" on error */
	453	retval = -EPIPE;
	454	}
	455	spin_unlock_irqrestore(&musb->lock, flags);
	456	return retval;
	457	}