[mirror_ubuntu-artful-kernel.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/init.h>
#include <linux/time.h>
#include <linux/timer.h>

#include <asm/unaligned.h>

#include "musb_core.h"


static 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->state) {
		case OTG_STATE_A_HOST:
			musb->xceiv->state = OTG_STATE_A_SUSPEND;
			musb->is_active = is_otg_enabled(musb)
					&& 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->state = OTG_STATE_B_WAIT_ACON;
			musb->is_active = is_otg_enabled(musb)
					&& otg->host->b_hnp_enable;
			musb_platform_try_idle(musb, 0);
			break;
		default:
			dev_dbg(musb->controller, "bogus rh suspend? %s\n",
				otg_state_string(musb->xceiv->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;
		musb->rh_timer = jiffies + msecs_to_jiffies(20);
	}
}

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

	if (musb->xceiv->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) {
			while (time_before(jiffies, musb->rh_timer))
				msleep(1);
			musb_writeb(mbase, MUSB_POWER,
				power & ~MUSB_POWER_RESUME);
			msleep(1);
		}

		musb->ignore_disconnect = true;
		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;
		musb->rh_timer = jiffies + msecs_to_jiffies(50);
	} else {
		dev_dbg(musb->controller, "root port reset stopped\n");
		musb_writeb(mbase, MUSB_POWER,
				power & ~MUSB_POWER_RESET);

		musb->ignore_disconnect = false;

		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_to_hcd(musb));

		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_to_hcd(musb));
	musb->is_active = 0;

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

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 (!(is_otg_enabled(musb) && 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;

		/* finish RESET signaling? */
		if ((musb->port1_status & USB_PORT_STAT_RESET)
				&& time_after_eq(jiffies, musb->rh_timer))
			musb_port_reset(musb, false);

		/* finish RESUME signaling? */
		if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
				&& time_after_eq(jiffies, musb->rh_timer)) {
			u8		power;

			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_to_hcd(musb));
			/* NOTE: it might really be A_WAIT_BCON ... */
			musb->xceiv->state = OTG_STATE_A_HOST;
		}

		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 (!(is_otg_enabled(musb) && hcd->self.is_b_host))
				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 FB	38	#include <linux/errno.h>
	39	#include <linux/init.h>
	40	#include <linux/time.h>
	41	#include <linux/timer.h>
	42
	43	#include <asm/unaligned.h>
	44
	45	#include "musb_core.h"
	46
	47
	48	static void musb_port_suspend(struct musb *musb, bool do_suspend)
	49	{
d445b6da	50	struct usb_otg *otg = musb->xceiv->otg;
550a7375 FB	51	u8 power;
	52	void __iomem *mbase = musb->mregs;
	53
	54	if (!is_host_active(musb))
	55	return;
	56
	57	/* NOTE: this doesn't necessarily put PHY into low power mode,
	58	* turning off its clock; that's a function of PHY integration and
	59	* MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
	60	* SE0 changing to connect (J) or wakeup (K) states.
	61	*/
	62	power = musb_readb(mbase, MUSB_POWER);
	63	if (do_suspend) {
	64	int retries = 10000;
	65
	66	power &= ~MUSB_POWER_RESUME;
	67	power \|= MUSB_POWER_SUSPENDM;
	68	musb_writeb(mbase, MUSB_POWER, power);
	69
	70	/* Needed for OPT A tests */
	71	power = musb_readb(mbase, MUSB_POWER);
	72	while (power & MUSB_POWER_SUSPENDM) {
	73	power = musb_readb(mbase, MUSB_POWER);
	74	if (retries-- < 1)
	75	break;
	76	}
	77
5c8a86e1	78	dev_dbg(musb->controller, "Root port suspended, power %02x\n", power);
550a7375 FB	79
550a7375 FB	80	musb->port1_status \|= USB_PORT_STAT_SUSPEND;
84e250ff	81	switch (musb->xceiv->state) {
550a7375	82	case OTG_STATE_A_HOST:
84e250ff	83	musb->xceiv->state = OTG_STATE_A_SUSPEND;
550a7375	84	musb->is_active = is_otg_enabled(musb)
d445b6da	85	&& otg->host->b_hnp_enable;
ab983f2a DB	86	if (musb->is_active)
	87	mod_timer(&musb->otg_timer, jiffies
	88	+ msecs_to_jiffies(
	89	OTG_TIME_A_AIDL_BDIS));
550a7375 FB	90	musb_platform_try_idle(musb, 0);
550a7375 FB	91	break;
550a7375	92	case OTG_STATE_B_HOST:
84e250ff	93	musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
550a7375	94	musb->is_active = is_otg_enabled(musb)
d445b6da	95	&& otg->host->b_hnp_enable;
550a7375 FB	96	musb_platform_try_idle(musb, 0);
550a7375 FB	97	break;
550a7375	98	default:
5c8a86e1	99	dev_dbg(musb->controller, "bogus rh suspend? %s\n",
3df00453	100	otg_state_string(musb->xceiv->state));
550a7375 FB	101	}
	102	} else if (power & MUSB_POWER_SUSPENDM) {
	103	power &= ~MUSB_POWER_SUSPENDM;
	104	power \|= MUSB_POWER_RESUME;
	105	musb_writeb(mbase, MUSB_POWER, power);
	106
5c8a86e1	107	dev_dbg(musb->controller, "Root port resuming, power %02x\n", power);
550a7375 FB	108
	109	/* later, GetPortStatus will stop RESUME signaling */
	110	musb->port1_status \|= MUSB_PORT_STAT_RESUME;
	111	musb->rh_timer = jiffies + msecs_to_jiffies(20);
	112	}
	113	}
	114
	115	static void musb_port_reset(struct musb *musb, bool do_reset)
	116	{
	117	u8 power;
	118	void __iomem *mbase = musb->mregs;
	119
84e250ff	120	if (musb->xceiv->state == OTG_STATE_B_IDLE) {
5c8a86e1	121	dev_dbg(musb->controller, "HNP: Returning from HNP; no hub reset from b_idle\n");
550a7375 FB	122	musb->port1_status &= ~USB_PORT_STAT_RESET;
	123	return;
	124	}
550a7375 FB	125
	126	if (!is_host_active(musb))
	127	return;
	128
	129	/* NOTE: caller guarantees it will turn off the reset when
	130	* the appropriate amount of time has passed
	131	*/
	132	power = musb_readb(mbase, MUSB_POWER);
	133	if (do_reset) {
	134
	135	/*
	136	* If RESUME is set, we must make sure it stays minimum 20 ms.
	137	* Then we must clear RESUME and wait a bit to let musb start
	138	* generating SOFs. If we don't do this, OPT HS A 6.8 tests
	139	* fail with "Error! Did not receive an SOF before suspend
	140	* detected".
	141	*/
	142	if (power & MUSB_POWER_RESUME) {
	143	while (time_before(jiffies, musb->rh_timer))
	144	msleep(1);
	145	musb_writeb(mbase, MUSB_POWER,
	146	power & ~MUSB_POWER_RESUME);
	147	msleep(1);
	148	}
	149
	150	musb->ignore_disconnect = true;
	151	power &= 0xf0;
	152	musb_writeb(mbase, MUSB_POWER,
	153	power \| MUSB_POWER_RESET);
	154
	155	musb->port1_status \|= USB_PORT_STAT_RESET;
	156	musb->port1_status &= ~USB_PORT_STAT_ENABLE;
	157	musb->rh_timer = jiffies + msecs_to_jiffies(50);
	158	} else {
5c8a86e1	159	dev_dbg(musb->controller, "root port reset stopped\n");
550a7375 FB	160	musb_writeb(mbase, MUSB_POWER,
	161	power & ~MUSB_POWER_RESET);
	162
	163	musb->ignore_disconnect = false;
	164
	165	power = musb_readb(mbase, MUSB_POWER);
	166	if (power & MUSB_POWER_HSMODE) {
5c8a86e1	167	dev_dbg(musb->controller, "high-speed device connected\n");
550a7375 FB	168	musb->port1_status \|= USB_PORT_STAT_HIGH_SPEED;
	169	}
	170
	171	musb->port1_status &= ~USB_PORT_STAT_RESET;
	172	musb->port1_status \|= USB_PORT_STAT_ENABLE
	173	\| (USB_PORT_STAT_C_RESET << 16)
	174	\| (USB_PORT_STAT_C_ENABLE << 16);
	175	usb_hcd_poll_rh_status(musb_to_hcd(musb));
	176
	177	musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
	178	}
	179	}
	180
	181	void musb_root_disconnect(struct musb *musb)
	182	{
d445b6da HK	183	struct usb_otg *otg = musb->xceiv->otg;
d445b6da HK	184
749da5f8 AS	185	musb->port1_status = USB_PORT_STAT_POWER
749da5f8 AS	186	\| (USB_PORT_STAT_C_CONNECTION << 16);
550a7375 FB	187
	188	usb_hcd_poll_rh_status(musb_to_hcd(musb));
	189	musb->is_active = 0;
	190
84e250ff	191	switch (musb->xceiv->state) {
550a7375	192	case OTG_STATE_A_SUSPEND:
1de00dae	193	if (is_otg_enabled(musb)
d445b6da	194	&& otg->host->b_hnp_enable) {
1de00dae DB	195	musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
	196	musb->g.is_a_peripheral = 1;
	197	break;
	198	}
1de00dae DB	199	/* FALLTHROUGH */
1de00dae DB	200	case OTG_STATE_A_HOST:
84e250ff	201	musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
550a7375 FB	202	musb->is_active = 0;
	203	break;
	204	case OTG_STATE_A_WAIT_VFALL:
84e250ff	205	musb->xceiv->state = OTG_STATE_B_IDLE;
550a7375 FB	206	break;
550a7375 FB	207	default:
5c8a86e1	208	dev_dbg(musb->controller, "host disconnect (%s)\n",
3df00453	209	otg_state_string(musb->xceiv->state));
550a7375 FB	210	}
	211	}
	212
	213
	214	/---------------------------------------------------------------------/
	215
	216	/* Caller may or may not hold musb->lock */
	217	int musb_hub_status_data(struct usb_hcd hcd, char buf)
	218	{
	219	struct musb *musb = hcd_to_musb(hcd);
	220	int retval = 0;
	221
	222	/* called in_irq() via usb_hcd_poll_rh_status() */
	223	if (musb->port1_status & 0xffff0000) {
	224	*buf = 0x02;
	225	retval = 1;
	226	}
	227	return retval;
	228	}
	229
	230	int musb_hub_control(
	231	struct usb_hcd *hcd,
	232	u16 typeReq,
	233	u16 wValue,
	234	u16 wIndex,
	235	char *buf,
	236	u16 wLength)
	237	{
	238	struct musb *musb = hcd_to_musb(hcd);
	239	u32 temp;
	240	int retval = 0;
	241	unsigned long flags;
	242
	243	spin_lock_irqsave(&musb->lock, flags);
	244
541c7d43	245	if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
550a7375 FB	246	spin_unlock_irqrestore(&musb->lock, flags);
	247	return -ESHUTDOWN;
	248	}
	249
	250	/* hub features: always zero, setting is a NOP
	251	* port features: reported, sometimes updated when host is active
	252	* no indicators
	253	*/
	254	switch (typeReq) {
	255	case ClearHubFeature:
	256	case SetHubFeature:
	257	switch (wValue) {
	258	case C_HUB_OVER_CURRENT:
	259	case C_HUB_LOCAL_POWER:
	260	break;
	261	default:
	262	goto error;
	263	}
	264	break;
	265	case ClearPortFeature:
	266	if ((wIndex & 0xff) != 1)
	267	goto error;
	268
	269	switch (wValue) {
	270	case USB_PORT_FEAT_ENABLE:
	271	break;
	272	case USB_PORT_FEAT_SUSPEND:
	273	musb_port_suspend(musb, false);
	274	break;
	275	case USB_PORT_FEAT_POWER:
	276	if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
743411b3	277	musb_platform_set_vbus(musb, 0);
550a7375 FB	278	break;
	279	case USB_PORT_FEAT_C_CONNECTION:
	280	case USB_PORT_FEAT_C_ENABLE:
	281	case USB_PORT_FEAT_C_OVER_CURRENT:
	282	case USB_PORT_FEAT_C_RESET:
	283	case USB_PORT_FEAT_C_SUSPEND:
	284	break;
	285	default:
	286	goto error;
	287	}
5c8a86e1	288	dev_dbg(musb->controller, "clear feature %d\n", wValue);
550a7375 FB	289	musb->port1_status &= ~(1 << wValue);
	290	break;
	291	case GetHubDescriptor:
	292	{
	293	struct usb_hub_descriptor desc = (void )buf;
	294
	295	desc->bDescLength = 9;
	296	desc->bDescriptorType = 0x29;
	297	desc->bNbrPorts = 1;
551509d2	298	desc->wHubCharacteristics = cpu_to_le16(
550a7375 FB	299	0x0001 /* per-port power switching */
	300	\| 0x0010 /* no overcurrent reporting */
	301	);
	302	desc->bPwrOn2PwrGood = 5; /* msec/2 */
	303	desc->bHubContrCurrent = 0;
	304
	305	/* workaround bogus struct definition */
dbe79bbe JY	306	desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
dbe79bbe JY	307	desc->u.hs.DeviceRemovable[1] = 0xff;
550a7375 FB	308	}
	309	break;
	310	case GetHubStatus:
	311	temp = 0;
	312	(__le32 ) buf = cpu_to_le32(temp);
	313	break;
	314	case GetPortStatus:
	315	if (wIndex != 1)
	316	goto error;
	317
	318	/* finish RESET signaling? */
	319	if ((musb->port1_status & USB_PORT_STAT_RESET)
	320	&& time_after_eq(jiffies, musb->rh_timer))
	321	musb_port_reset(musb, false);
	322
	323	/* finish RESUME signaling? */
	324	if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
	325	&& time_after_eq(jiffies, musb->rh_timer)) {
	326	u8 power;
	327
	328	power = musb_readb(musb->mregs, MUSB_POWER);
	329	power &= ~MUSB_POWER_RESUME;
5c8a86e1	330	dev_dbg(musb->controller, "root port resume stopped, power %02x\n",
550a7375 FB	331	power);
	332	musb_writeb(musb->mregs, MUSB_POWER, power);
	333
	334	/* ISSUE: DaVinci (RTL 1.300) disconnects after
	335	* resume of high speed peripherals (but not full
	336	* speed ones).
	337	*/
	338
	339	musb->is_active = 1;
	340	musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
	341	\| MUSB_PORT_STAT_RESUME);
	342	musb->port1_status \|= USB_PORT_STAT_C_SUSPEND << 16;
	343	usb_hcd_poll_rh_status(musb_to_hcd(musb));
	344	/* NOTE: it might really be A_WAIT_BCON ... */
84e250ff	345	musb->xceiv->state = OTG_STATE_A_HOST;
550a7375 FB	346	}
	347
	348	put_unaligned(cpu_to_le32(musb->port1_status
	349	& ~MUSB_PORT_STAT_RESUME),
	350	(__le32 *) buf);
	351
	352	/* port change status is more interesting */
5c8a86e1	353	dev_dbg(musb->controller, "port status %08x\n",
550a7375 FB	354	musb->port1_status);
	355	break;
	356	case SetPortFeature:
	357	if ((wIndex & 0xff) != 1)
	358	goto error;
	359
	360	switch (wValue) {
	361	case USB_PORT_FEAT_POWER:
	362	/* NOTE: this controller has a strange state machine
	363	* that involves "requesting sessions" according to
	364	* magic side effects from incompletely-described
	365	* rules about startup...
	366	*
	367	* This call is what really starts the host mode; be
	368	* very careful about side effects if you reorder any
	369	* initialization logic, e.g. for OTG, or change any
	370	* logic relating to VBUS power-up.
	371	*/
	372	if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
	373	musb_start(musb);
	374	break;
	375	case USB_PORT_FEAT_RESET:
	376	musb_port_reset(musb, true);
	377	break;
	378	case USB_PORT_FEAT_SUSPEND:
	379	musb_port_suspend(musb, true);
	380	break;
	381	case USB_PORT_FEAT_TEST:
	382	if (unlikely(is_host_active(musb)))
	383	goto error;
	384
	385	wIndex >>= 8;
	386	switch (wIndex) {
	387	case 1:
	388	pr_debug("TEST_J\n");
	389	temp = MUSB_TEST_J;
	390	break;
	391	case 2:
	392	pr_debug("TEST_K\n");
	393	temp = MUSB_TEST_K;
	394	break;
	395	case 3:
	396	pr_debug("TEST_SE0_NAK\n");
	397	temp = MUSB_TEST_SE0_NAK;
	398	break;
	399	case 4:
	400	pr_debug("TEST_PACKET\n");
	401	temp = MUSB_TEST_PACKET;
	402	musb_load_testpacket(musb);
	403	break;
	404	case 5:
	405	pr_debug("TEST_FORCE_ENABLE\n");
	406	temp = MUSB_TEST_FORCE_HOST
	407	\| MUSB_TEST_FORCE_HS;
	408
	409	musb_writeb(musb->mregs, MUSB_DEVCTL,
	410	MUSB_DEVCTL_SESSION);
	411	break;
	412	case 6:
	413	pr_debug("TEST_FIFO_ACCESS\n");
	414	temp = MUSB_TEST_FIFO_ACCESS;
	415	break;
	416	default:
	417	goto error;
418	}
419	musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
420	break;
421	default:
422	goto error;
423	}
5c8a86e1	424	dev_dbg(musb->controller, "set feature %d\n", wValue);
550a7375 FB	425	musb->port1_status \|= 1 << wValue;
	426	break;
	427
	428	default:
	429	error:
	430	/* "protocol stall" on error */
	431	retval = -EPIPE;
	432	}
	433	spin_unlock_irqrestore(&musb->lock, flags);
	434	return retval;
	435	}