[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/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;
			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;
550a7375 FB	86	musb_platform_try_idle(musb, 0);
	87	break;
	88	#ifdef CONFIG_USB_MUSB_OTG
	89	case OTG_STATE_B_HOST:
84e250ff	90	musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
550a7375	91	musb->is_active = is_otg_enabled(musb)
84e250ff	92	&& musb->xceiv->host->b_hnp_enable;
550a7375 FB	93	musb_platform_try_idle(musb, 0);
	94	break;
	95	#endif
	96	default:
	97	DBG(1, "bogus rh suspend? %s\n",
	98	otg_state_string(musb));
	99	}
	100	} else if (power & MUSB_POWER_SUSPENDM) {
	101	power &= ~MUSB_POWER_SUSPENDM;
	102	power \|= MUSB_POWER_RESUME;
	103	musb_writeb(mbase, MUSB_POWER, power);
	104
	105	DBG(3, "Root port resuming, power %02x\n", power);
	106
	107	/* later, GetPortStatus will stop RESUME signaling */
	108	musb->port1_status \|= MUSB_PORT_STAT_RESUME;
	109	musb->rh_timer = jiffies + msecs_to_jiffies(20);
	110	}
	111	}
	112
	113	static void musb_port_reset(struct musb *musb, bool do_reset)
	114	{
	115	u8 power;
	116	void __iomem *mbase = musb->mregs;
	117
	118	#ifdef CONFIG_USB_MUSB_OTG
84e250ff	119	if (musb->xceiv->state == OTG_STATE_B_IDLE) {
550a7375 FB	120	DBG(2, "HNP: Returning from HNP; no hub reset from b_idle\n");
	121	musb->port1_status &= ~USB_PORT_STAT_RESET;
	122	return;
	123	}
	124	#endif
	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 {
	159	DBG(4, "root port reset stopped\n");
	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) {
	167	DBG(4, "high-speed device connected\n");
	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	{
	183	musb->port1_status = (1 << USB_PORT_FEAT_POWER)
184	\| (1 << USB_PORT_FEAT_C_CONNECTION);
185
186	usb_hcd_poll_rh_status(musb_to_hcd(musb));
187	musb->is_active = 0;
188
84e250ff	189	switch (musb->xceiv->state) {
550a7375	190	case OTG_STATE_A_SUSPEND:
1de00dae DB	191	#ifdef CONFIG_USB_MUSB_OTG
	192	if (is_otg_enabled(musb)
	193	&& musb->xceiv->host->b_hnp_enable) {
	194	musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
	195	musb->g.is_a_peripheral = 1;
	196	break;
	197	}
	198	#endif
	199	/* FALLTHROUGH */
	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;
	207	default:
	208	DBG(1, "host disconnect (%s)\n", otg_state_string(musb));
	209	}
	210	}
	211
	212
	213	/---------------------------------------------------------------------/
	214
	215	/* Caller may or may not hold musb->lock */
	216	int musb_hub_status_data(struct usb_hcd hcd, char buf)
	217	{
	218	struct musb *musb = hcd_to_musb(hcd);
	219	int retval = 0;
	220
	221	/* called in_irq() via usb_hcd_poll_rh_status() */
	222	if (musb->port1_status & 0xffff0000) {
	223	*buf = 0x02;
	224	retval = 1;
	225	}
	226	return retval;
	227	}
	228
	229	int musb_hub_control(
	230	struct usb_hcd *hcd,
	231	u16 typeReq,
	232	u16 wValue,
	233	u16 wIndex,
	234	char *buf,
	235	u16 wLength)
	236	{
	237	struct musb *musb = hcd_to_musb(hcd);
	238	u32 temp;
	239	int retval = 0;
	240	unsigned long flags;
	241
	242	spin_lock_irqsave(&musb->lock, flags);
	243
	244	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
	245	spin_unlock_irqrestore(&musb->lock, flags);
	246	return -ESHUTDOWN;
	247	}
	248
	249	/* hub features: always zero, setting is a NOP
	250	* port features: reported, sometimes updated when host is active
	251	* no indicators
	252	*/
	253	switch (typeReq) {
	254	case ClearHubFeature:
	255	case SetHubFeature:
	256	switch (wValue) {
	257	case C_HUB_OVER_CURRENT:
	258	case C_HUB_LOCAL_POWER:
	259	break;
	260	default:
	261	goto error;
	262	}
	263	break;
	264	case ClearPortFeature:
	265	if ((wIndex & 0xff) != 1)
	266	goto error;
	267
	268	switch (wValue) {
	269	case USB_PORT_FEAT_ENABLE:
270	break;
271	case USB_PORT_FEAT_SUSPEND:
272	musb_port_suspend(musb, false);
273	break;
274	case USB_PORT_FEAT_POWER:
275	if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
276	musb_set_vbus(musb, 0);
277	break;
278	case USB_PORT_FEAT_C_CONNECTION:
279	case USB_PORT_FEAT_C_ENABLE:
280	case USB_PORT_FEAT_C_OVER_CURRENT:
281	case USB_PORT_FEAT_C_RESET:
282	case USB_PORT_FEAT_C_SUSPEND:
283	break;
284	default:
285	goto error;
286	}
287	DBG(5, "clear feature %d\n", wValue);
288	musb->port1_status &= ~(1 << wValue);
289	break;
290	case GetHubDescriptor:
291	{
292	struct usb_hub_descriptor desc = (void )buf;
293
294	desc->bDescLength = 9;
295	desc->bDescriptorType = 0x29;
296	desc->bNbrPorts = 1;
551509d2	297	desc->wHubCharacteristics = cpu_to_le16(
550a7375 FB	298	0x0001 /* per-port power switching */
	299	\| 0x0010 /* no overcurrent reporting */
	300	);
	301	desc->bPwrOn2PwrGood = 5; /* msec/2 */
	302	desc->bHubContrCurrent = 0;
	303
	304	/* workaround bogus struct definition */
	305	desc->DeviceRemovable[0] = 0x02; /* port 1 */
	306	desc->DeviceRemovable[1] = 0xff;
	307	}
	308	break;
	309	case GetHubStatus:
	310	temp = 0;
	311	(__le32 ) buf = cpu_to_le32(temp);
	312	break;
	313	case GetPortStatus:
	314	if (wIndex != 1)
	315	goto error;
	316
	317	/* finish RESET signaling? */
	318	if ((musb->port1_status & USB_PORT_STAT_RESET)
	319	&& time_after_eq(jiffies, musb->rh_timer))
	320	musb_port_reset(musb, false);
	321
	322	/* finish RESUME signaling? */
	323	if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
	324	&& time_after_eq(jiffies, musb->rh_timer)) {
	325	u8 power;
	326
	327	power = musb_readb(musb->mregs, MUSB_POWER);
	328	power &= ~MUSB_POWER_RESUME;
	329	DBG(4, "root port resume stopped, power %02x\n",
	330	power);
	331	musb_writeb(musb->mregs, MUSB_POWER, power);
	332
	333	/* ISSUE: DaVinci (RTL 1.300) disconnects after
	334	* resume of high speed peripherals (but not full
	335	* speed ones).
	336	*/
	337
	338	musb->is_active = 1;
	339	musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
	340	\| MUSB_PORT_STAT_RESUME);
	341	musb->port1_status \|= USB_PORT_STAT_C_SUSPEND << 16;
	342	usb_hcd_poll_rh_status(musb_to_hcd(musb));
	343	/* NOTE: it might really be A_WAIT_BCON ... */
84e250ff	344	musb->xceiv->state = OTG_STATE_A_HOST;
550a7375 FB	345	}
	346
	347	put_unaligned(cpu_to_le32(musb->port1_status
	348	& ~MUSB_PORT_STAT_RESUME),
	349	(__le32 *) buf);
	350
	351	/* port change status is more interesting */
	352	DBG(get_unaligned((u16 *)(buf+2)) ? 2 : 5, "port status %08x\n",
	353	musb->port1_status);
	354	break;
	355	case SetPortFeature:
	356	if ((wIndex & 0xff) != 1)
	357	goto error;
	358
	359	switch (wValue) {
	360	case USB_PORT_FEAT_POWER:
	361	/* NOTE: this controller has a strange state machine
	362	* that involves "requesting sessions" according to
	363	* magic side effects from incompletely-described
	364	* rules about startup...
	365	*
	366	* This call is what really starts the host mode; be
	367	* very careful about side effects if you reorder any
	368	* initialization logic, e.g. for OTG, or change any
	369	* logic relating to VBUS power-up.
	370	*/
	371	if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
	372	musb_start(musb);
	373	break;
	374	case USB_PORT_FEAT_RESET:
	375	musb_port_reset(musb, true);
	376	break;
	377	case USB_PORT_FEAT_SUSPEND:
	378	musb_port_suspend(musb, true);
	379	break;
	380	case USB_PORT_FEAT_TEST:
	381	if (unlikely(is_host_active(musb)))
	382	goto error;
	383
	384	wIndex >>= 8;
	385	switch (wIndex) {
	386	case 1:
	387	pr_debug("TEST_J\n");
	388	temp = MUSB_TEST_J;
	389	break;
	390	case 2:
	391	pr_debug("TEST_K\n");
	392	temp = MUSB_TEST_K;
	393	break;
	394	case 3:
	395	pr_debug("TEST_SE0_NAK\n");
	396	temp = MUSB_TEST_SE0_NAK;
	397	break;
	398	case 4:
	399	pr_debug("TEST_PACKET\n");
	400	temp = MUSB_TEST_PACKET;
	401	musb_load_testpacket(musb);
	402	break;
	403	case 5:
	404	pr_debug("TEST_FORCE_ENABLE\n");
	405	temp = MUSB_TEST_FORCE_HOST
	406	\| MUSB_TEST_FORCE_HS;
	407
	408	musb_writeb(musb->mregs, MUSB_DEVCTL,
409	MUSB_DEVCTL_SESSION);
410	break;
411	case 6:
412	pr_debug("TEST_FIFO_ACCESS\n");
413	temp = MUSB_TEST_FIFO_ACCESS;
414	break;
415	default:
416	goto error;
417	}
418	musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
419	break;
420	default:
421	goto error;
422	}
423	DBG(5, "set feature %d\n", wValue);
424	musb->port1_status \|= 1 << wValue;
425	break;
426
427	default:
428	error:
429	/* "protocol stall" on error */
430	retval = -EPIPE;
431	}
432	spin_unlock_irqrestore(&musb->lock, flags);
433	return retval;
434	}