[net-next-2.6.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/slab.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)
{
	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;
		}

		DBG(3, "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)
					&& musb->xceiv->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;
#ifdef	CONFIG_USB_MUSB_OTG
		case OTG_STATE_B_HOST:
			musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
			musb->is_active = is_otg_enabled(musb)
					&& musb->xceiv->host->b_hnp_enable;
			musb_platform_try_idle(musb, 0);
			break;
#endif
		default:
			DBG(1, "bogus rh suspend? %s\n",
				otg_state_string(musb));
		}
	} else if (power & MUSB_POWER_SUSPENDM) {
		power &= ~MUSB_POWER_SUSPENDM;
		power |= MUSB_POWER_RESUME;
		musb_writeb(mbase, MUSB_POWER, power);

		DBG(3, "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;

#ifdef CONFIG_USB_MUSB_OTG
	if (musb->xceiv->state == OTG_STATE_B_IDLE) {
		DBG(2, "HNP: Returning from HNP; no hub reset from b_idle\n");
		musb->port1_status &= ~USB_PORT_STAT_RESET;
		return;
	}
#endif

	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 {
		DBG(4, "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) {
			DBG(4, "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)
{
	musb->port1_status = (1 << USB_PORT_FEAT_POWER)
			| (1 << USB_PORT_FEAT_C_CONNECTION);

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

	switch (musb->xceiv->state) {
	case OTG_STATE_A_SUSPEND:
#ifdef	CONFIG_USB_MUSB_OTG
		if (is_otg_enabled(musb)
				&& musb->xceiv->host->b_hnp_enable) {
			musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
			musb->g.is_a_peripheral = 1;
			break;
		}
#endif
		/* 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:
		DBG(1, "host disconnect (%s)\n", otg_state_string(musb));
	}
}


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

/* 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(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
		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_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;
		}
		DBG(5, "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->DeviceRemovable[0] = 0x02;	/* port 1 */
		desc->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;
			DBG(4, "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 */
		DBG(get_unaligned((u16 *)(buf+2)) ? 2 : 5, "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;
		}
		DBG(5, "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>
	38	#include <linux/slab.h>
	39	#include <linux/errno.h>
	40	#include <linux/init.h>
	41	#include <linux/time.h>
	42	#include <linux/timer.h>
	43
	44	#include <asm/unaligned.h>
	45
	46	#include "musb_core.h"
	47
	48
	49	static void musb_port_suspend(struct musb *musb, bool do_suspend)
	50	{
	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
78	DBG(3, "Root port suspended, power %02x\n", power);
79
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)
84e250ff	85	&& musb->xceiv->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);
	91	break;
	92	#ifdef CONFIG_USB_MUSB_OTG
	93	case OTG_STATE_B_HOST:
84e250ff	94	musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
550a7375	95	musb->is_active = is_otg_enabled(musb)
84e250ff	96	&& musb->xceiv->host->b_hnp_enable;
550a7375 FB	97	musb_platform_try_idle(musb, 0);
	98	break;
	99	#endif
	100	default:
	101	DBG(1, "bogus rh suspend? %s\n",
	102	otg_state_string(musb));
	103	}
	104	} else if (power & MUSB_POWER_SUSPENDM) {
	105	power &= ~MUSB_POWER_SUSPENDM;
	106	power \|= MUSB_POWER_RESUME;
	107	musb_writeb(mbase, MUSB_POWER, power);
	108
	109	DBG(3, "Root port resuming, power %02x\n", power);
	110
	111	/* later, GetPortStatus will stop RESUME signaling */
	112	musb->port1_status \|= MUSB_PORT_STAT_RESUME;
	113	musb->rh_timer = jiffies + msecs_to_jiffies(20);
	114	}
	115	}
	116
	117	static void musb_port_reset(struct musb *musb, bool do_reset)
	118	{
	119	u8 power;
	120	void __iomem *mbase = musb->mregs;
	121
	122	#ifdef CONFIG_USB_MUSB_OTG
84e250ff	123	if (musb->xceiv->state == OTG_STATE_B_IDLE) {
550a7375 FB	124	DBG(2, "HNP: Returning from HNP; no hub reset from b_idle\n");
	125	musb->port1_status &= ~USB_PORT_STAT_RESET;
	126	return;
	127	}
	128	#endif
	129
	130	if (!is_host_active(musb))
	131	return;
	132
	133	/* NOTE: caller guarantees it will turn off the reset when
	134	* the appropriate amount of time has passed
	135	*/
	136	power = musb_readb(mbase, MUSB_POWER);
	137	if (do_reset) {
	138
	139	/*
	140	* If RESUME is set, we must make sure it stays minimum 20 ms.
	141	* Then we must clear RESUME and wait a bit to let musb start
	142	* generating SOFs. If we don't do this, OPT HS A 6.8 tests
	143	* fail with "Error! Did not receive an SOF before suspend
	144	* detected".
	145	*/
	146	if (power & MUSB_POWER_RESUME) {
	147	while (time_before(jiffies, musb->rh_timer))
	148	msleep(1);
	149	musb_writeb(mbase, MUSB_POWER,
	150	power & ~MUSB_POWER_RESUME);
	151	msleep(1);
	152	}
	153
	154	musb->ignore_disconnect = true;
	155	power &= 0xf0;
	156	musb_writeb(mbase, MUSB_POWER,
	157	power \| MUSB_POWER_RESET);
	158
	159	musb->port1_status \|= USB_PORT_STAT_RESET;
	160	musb->port1_status &= ~USB_PORT_STAT_ENABLE;
	161	musb->rh_timer = jiffies + msecs_to_jiffies(50);
	162	} else {
	163	DBG(4, "root port reset stopped\n");
	164	musb_writeb(mbase, MUSB_POWER,
	165	power & ~MUSB_POWER_RESET);
	166
	167	musb->ignore_disconnect = false;
	168
	169	power = musb_readb(mbase, MUSB_POWER);
	170	if (power & MUSB_POWER_HSMODE) {
	171	DBG(4, "high-speed device connected\n");
	172	musb->port1_status \|= USB_PORT_STAT_HIGH_SPEED;
	173	}
	174
	175	musb->port1_status &= ~USB_PORT_STAT_RESET;
	176	musb->port1_status \|= USB_PORT_STAT_ENABLE
	177	\| (USB_PORT_STAT_C_RESET << 16)
	178	\| (USB_PORT_STAT_C_ENABLE << 16);
	179	usb_hcd_poll_rh_status(musb_to_hcd(musb));
	180
	181	musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
	182	}
	183	}
	184
	185	void musb_root_disconnect(struct musb *musb)
	186	{
	187	musb->port1_status = (1 << USB_PORT_FEAT_POWER)
188	\| (1 << USB_PORT_FEAT_C_CONNECTION);
189
190	usb_hcd_poll_rh_status(musb_to_hcd(musb));
191	musb->is_active = 0;
192
84e250ff	193	switch (musb->xceiv->state) {
550a7375	194	case OTG_STATE_A_SUSPEND:
1de00dae DB	195	#ifdef CONFIG_USB_MUSB_OTG
	196	if (is_otg_enabled(musb)
	197	&& musb->xceiv->host->b_hnp_enable) {
	198	musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
	199	musb->g.is_a_peripheral = 1;
	200	break;
	201	}
	202	#endif
	203	/* FALLTHROUGH */
	204	case OTG_STATE_A_HOST:
84e250ff	205	musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
550a7375 FB	206	musb->is_active = 0;
	207	break;
	208	case OTG_STATE_A_WAIT_VFALL:
84e250ff	209	musb->xceiv->state = OTG_STATE_B_IDLE;
550a7375 FB	210	break;
	211	default:
	212	DBG(1, "host disconnect (%s)\n", otg_state_string(musb));
	213	}
	214	}
	215
	216
	217	/---------------------------------------------------------------------/
	218
	219	/* Caller may or may not hold musb->lock */
	220	int musb_hub_status_data(struct usb_hcd hcd, char buf)
	221	{
	222	struct musb *musb = hcd_to_musb(hcd);
	223	int retval = 0;
	224
	225	/* called in_irq() via usb_hcd_poll_rh_status() */
	226	if (musb->port1_status & 0xffff0000) {
	227	*buf = 0x02;
	228	retval = 1;
	229	}
	230	return retval;
	231	}
	232
	233	int musb_hub_control(
	234	struct usb_hcd *hcd,
	235	u16 typeReq,
	236	u16 wValue,
	237	u16 wIndex,
	238	char *buf,
	239	u16 wLength)
	240	{
	241	struct musb *musb = hcd_to_musb(hcd);
	242	u32 temp;
	243	int retval = 0;
	244	unsigned long flags;
	245
	246	spin_lock_irqsave(&musb->lock, flags);
	247
	248	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
	249	spin_unlock_irqrestore(&musb->lock, flags);
	250	return -ESHUTDOWN;
	251	}
	252
	253	/* hub features: always zero, setting is a NOP
	254	* port features: reported, sometimes updated when host is active
	255	* no indicators
	256	*/
	257	switch (typeReq) {
	258	case ClearHubFeature:
	259	case SetHubFeature:
	260	switch (wValue) {
	261	case C_HUB_OVER_CURRENT:
	262	case C_HUB_LOCAL_POWER:
	263	break;
	264	default:
	265	goto error;
	266	}
	267	break;
	268	case ClearPortFeature:
	269	if ((wIndex & 0xff) != 1)
	270	goto error;
	271
	272	switch (wValue) {
	273	case USB_PORT_FEAT_ENABLE:
274	break;
275	case USB_PORT_FEAT_SUSPEND:
276	musb_port_suspend(musb, false);
277	break;
278	case USB_PORT_FEAT_POWER:
279	if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
280	musb_set_vbus(musb, 0);
281	break;
282	case USB_PORT_FEAT_C_CONNECTION:
283	case USB_PORT_FEAT_C_ENABLE:
284	case USB_PORT_FEAT_C_OVER_CURRENT:
285	case USB_PORT_FEAT_C_RESET:
286	case USB_PORT_FEAT_C_SUSPEND:
287	break;
288	default:
289	goto error;
290	}
291	DBG(5, "clear feature %d\n", wValue);
292	musb->port1_status &= ~(1 << wValue);
293	break;
294	case GetHubDescriptor:
295	{
296	struct usb_hub_descriptor desc = (void )buf;
297
298	desc->bDescLength = 9;
299	desc->bDescriptorType = 0x29;
300	desc->bNbrPorts = 1;
551509d2	301	desc->wHubCharacteristics = cpu_to_le16(
550a7375 FB	302	0x0001 /* per-port power switching */
	303	\| 0x0010 /* no overcurrent reporting */
	304	);
	305	desc->bPwrOn2PwrGood = 5; /* msec/2 */
	306	desc->bHubContrCurrent = 0;
	307
	308	/* workaround bogus struct definition */
	309	desc->DeviceRemovable[0] = 0x02; /* port 1 */
	310	desc->DeviceRemovable[1] = 0xff;
	311	}
	312	break;
	313	case GetHubStatus:
	314	temp = 0;
	315	(__le32 ) buf = cpu_to_le32(temp);
	316	break;
	317	case GetPortStatus:
	318	if (wIndex != 1)
	319	goto error;
	320
	321	/* finish RESET signaling? */
	322	if ((musb->port1_status & USB_PORT_STAT_RESET)
	323	&& time_after_eq(jiffies, musb->rh_timer))
	324	musb_port_reset(musb, false);
	325
	326	/* finish RESUME signaling? */
	327	if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
	328	&& time_after_eq(jiffies, musb->rh_timer)) {
	329	u8 power;
	330
	331	power = musb_readb(musb->mregs, MUSB_POWER);
	332	power &= ~MUSB_POWER_RESUME;
	333	DBG(4, "root port resume stopped, power %02x\n",
	334	power);
	335	musb_writeb(musb->mregs, MUSB_POWER, power);
	336
	337	/* ISSUE: DaVinci (RTL 1.300) disconnects after
	338	* resume of high speed peripherals (but not full
	339	* speed ones).
	340	*/
	341
	342	musb->is_active = 1;
	343	musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
	344	\| MUSB_PORT_STAT_RESUME);
	345	musb->port1_status \|= USB_PORT_STAT_C_SUSPEND << 16;
	346	usb_hcd_poll_rh_status(musb_to_hcd(musb));
	347	/* NOTE: it might really be A_WAIT_BCON ... */
84e250ff	348	musb->xceiv->state = OTG_STATE_A_HOST;
550a7375 FB	349	}
	350
	351	put_unaligned(cpu_to_le32(musb->port1_status
	352	& ~MUSB_PORT_STAT_RESUME),
	353	(__le32 *) buf);
	354
	355	/* port change status is more interesting */
	356	DBG(get_unaligned((u16 *)(buf+2)) ? 2 : 5, "port status %08x\n",
	357	musb->port1_status);
	358	break;
	359	case SetPortFeature:
	360	if ((wIndex & 0xff) != 1)
	361	goto error;
	362
	363	switch (wValue) {
	364	case USB_PORT_FEAT_POWER:
	365	/* NOTE: this controller has a strange state machine
	366	* that involves "requesting sessions" according to
	367	* magic side effects from incompletely-described
	368	* rules about startup...
	369	*
	370	* This call is what really starts the host mode; be
	371	* very careful about side effects if you reorder any
	372	* initialization logic, e.g. for OTG, or change any
	373	* logic relating to VBUS power-up.
	374	*/
	375	if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
	376	musb_start(musb);
	377	break;
	378	case USB_PORT_FEAT_RESET:
	379	musb_port_reset(musb, true);
	380	break;
	381	case USB_PORT_FEAT_SUSPEND:
	382	musb_port_suspend(musb, true);
	383	break;
	384	case USB_PORT_FEAT_TEST:
	385	if (unlikely(is_host_active(musb)))
	386	goto error;
	387
	388	wIndex >>= 8;
	389	switch (wIndex) {
	390	case 1:
	391	pr_debug("TEST_J\n");
	392	temp = MUSB_TEST_J;
	393	break;
	394	case 2:
	395	pr_debug("TEST_K\n");
	396	temp = MUSB_TEST_K;
	397	break;
	398	case 3:
	399	pr_debug("TEST_SE0_NAK\n");
	400	temp = MUSB_TEST_SE0_NAK;
	401	break;
	402	case 4:
	403	pr_debug("TEST_PACKET\n");
	404	temp = MUSB_TEST_PACKET;
	405	musb_load_testpacket(musb);
	406	break;
	407	case 5:
	408	pr_debug("TEST_FORCE_ENABLE\n");
	409	temp = MUSB_TEST_FORCE_HOST
	410	\| MUSB_TEST_FORCE_HS;
	411
	412	musb_writeb(musb->mregs, MUSB_DEVCTL,
413	MUSB_DEVCTL_SESSION);
414	break;
415	case 6:
416	pr_debug("TEST_FIFO_ACCESS\n");
417	temp = MUSB_TEST_FIFO_ACCESS;
418	break;
419	default:
420	goto error;
421	}
422	musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
423	break;
424	default:
425	goto error;
426	}
427	DBG(5, "set feature %d\n", wValue);
428	musb->port1_status \|= 1 << wValue;
429	break;
430
431	default:
432	error:
433	/* "protocol stall" on error */
434	retval = -EPIPE;
435	}
436	spin_unlock_irqrestore(&musb->lock, flags);
437	return retval;
438	}