[mirror_ubuntu-jammy-kernel.git] / drivers / usb / musb / musb_virthub.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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
 */

#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;
	musb_dbg(musb, "root port resume stopped, power %02x", 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);
}

int 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 0;

	/* 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;

		if (power & MUSB_POWER_RESUME)
			return -EBUSY;

		if (!(power & MUSB_POWER_SUSPENDM)) {
			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;
			}
		}

		musb_dbg(musb, "Root port suspended, power %02x", 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:
			musb_dbg(musb, "bogus rh suspend? %s",
				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);

		musb_dbg(musb, "Root port resuming, power %02x", power);

		musb->port1_status |= MUSB_PORT_STAT_RESUME;
		schedule_delayed_work(&musb->finish_resume_work,
				      msecs_to_jiffies(USB_RESUME_TIMEOUT));
	}
	return 0;
}

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) {
		musb_dbg(musb, "HNP: Returning from HNP; no hub reset from b_idle");
		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 {
		musb_dbg(musb, "root port reset stopped");
		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) {
			musb_dbg(musb, "high-speed device connected");
			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:
		musb_dbg(musb, "host disconnect (%s)",
			usb_otg_state_string(musb->xceiv->otg->state));
	}
}
EXPORT_SYMBOL_GPL(musb_root_disconnect);


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

/* 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_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;
	bool		start_musb = false;

	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;
		}
		musb_dbg(musb, "clear feature %d", 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 */
		musb_dbg(musb, "port status %08x", 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))
				start_musb = true;
			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 USB_TEST_J:
				pr_debug("USB_TEST_J\n");
				temp = MUSB_TEST_J;
				break;
			case USB_TEST_K:
				pr_debug("USB_TEST_K\n");
				temp = MUSB_TEST_K;
				break;
			case USB_TEST_SE0_NAK:
				pr_debug("USB_TEST_SE0_NAK\n");
				temp = MUSB_TEST_SE0_NAK;
				break;
			case USB_TEST_PACKET:
				pr_debug("USB_TEST_PACKET\n");
				temp = MUSB_TEST_PACKET;
				musb_load_testpacket(musb);
				break;
			case USB_TEST_FORCE_ENABLE:
				pr_debug("USB_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;
		}
		musb_dbg(musb, "set feature %d", wValue);
		musb->port1_status |= 1 << wValue;
		break;

	default:
error:
		/* "protocol stall" on error */
		retval = -EPIPE;
	}
	spin_unlock_irqrestore(&musb->lock, flags);

	if (start_musb)
		musb_start(musb);

	return retval;
}
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0
550a7375 FB	2	/*
	3	* MUSB OTG driver virtual root hub support
	4	*
	5	* Copyright 2005 Mentor Graphics Corporation
	6	* Copyright (C) 2005-2006 by Texas Instruments
	7	* Copyright (C) 2006-2007 Nokia Corporation
550a7375 FB	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
	12	#include <linux/sched.h>
550a7375	13	#include <linux/errno.h>
550a7375 FB	14	#include <linux/time.h>
	15	#include <linux/timer.h>
	16
	17	#include <asm/unaligned.h>
	18
	19	#include "musb_core.h"
	20
8ed1fb79 DM	21	void musb_host_finish_resume(struct work_struct *work)
	22	{
	23	struct musb *musb;
	24	unsigned long flags;
	25	u8 power;
	26
fa6997d3	27	musb = container_of(work, struct musb, finish_resume_work.work);
8ed1fb79 DM	28
	29	spin_lock_irqsave(&musb->lock, flags);
	30
	31	power = musb_readb(musb->mregs, MUSB_POWER);
	32	power &= ~MUSB_POWER_RESUME;
b99d3659	33	musb_dbg(musb, "root port resume stopped, power %02x", power);
8ed1fb79 DM	34	musb_writeb(musb->mregs, MUSB_POWER, power);
	35
	36	/*
	37	* ISSUE: DaVinci (RTL 1.300) disconnects after
	38	* resume of high speed peripherals (but not full
	39	* speed ones).
	40	*/
	41	musb->is_active = 1;
	42	musb->port1_status &= ~(USB_PORT_STAT_SUSPEND \| MUSB_PORT_STAT_RESUME);
	43	musb->port1_status \|= USB_PORT_STAT_C_SUSPEND << 16;
	44	usb_hcd_poll_rh_status(musb->hcd);
	45	/* NOTE: it might really be A_WAIT_BCON ... */
e47d9254	46	musb->xceiv->otg->state = OTG_STATE_A_HOST;
8ed1fb79 DM	47
	48	spin_unlock_irqrestore(&musb->lock, flags);
	49	}
	50
ebc3dd68	51	int musb_port_suspend(struct musb *musb, bool do_suspend)
550a7375	52	{
d445b6da	53	struct usb_otg *otg = musb->xceiv->otg;
550a7375 FB	54	u8 power;
	55	void __iomem *mbase = musb->mregs;
	56
	57	if (!is_host_active(musb))
ebc3dd68	58	return 0;
550a7375 FB	59
	60	/* NOTE: this doesn't necessarily put PHY into low power mode,
	61	* turning off its clock; that's a function of PHY integration and
	62	* MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
	63	* SE0 changing to connect (J) or wakeup (K) states.
	64	*/
	65	power = musb_readb(mbase, MUSB_POWER);
	66	if (do_suspend) {
	67	int retries = 10000;
	68
ebc3dd68 DG	69	if (power & MUSB_POWER_RESUME)
	70	return -EBUSY;
	71
	72	if (!(power & MUSB_POWER_SUSPENDM)) {
	73	power \|= MUSB_POWER_SUSPENDM;
	74	musb_writeb(mbase, MUSB_POWER, power);
550a7375	75
ebc3dd68	76	/* Needed for OPT A tests */
550a7375	77	power = musb_readb(mbase, MUSB_POWER);
ebc3dd68 DG	78	while (power & MUSB_POWER_SUSPENDM) {
	79	power = musb_readb(mbase, MUSB_POWER);
	80	if (retries-- < 1)
	81	break;
	82	}
550a7375 FB	83	}
550a7375 FB	84
b99d3659	85	musb_dbg(musb, "Root port suspended, power %02x", power);
550a7375 FB	86
550a7375 FB	87	musb->port1_status \|= USB_PORT_STAT_SUSPEND;
e47d9254	88	switch (musb->xceiv->otg->state) {
550a7375	89	case OTG_STATE_A_HOST:
e47d9254	90	musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
032ec49f	91	musb->is_active = otg->host->b_hnp_enable;
ab983f2a DB	92	if (musb->is_active)
	93	mod_timer(&musb->otg_timer, jiffies
	94	+ msecs_to_jiffies(
	95	OTG_TIME_A_AIDL_BDIS));
550a7375 FB	96	musb_platform_try_idle(musb, 0);
550a7375 FB	97	break;
550a7375	98	case OTG_STATE_B_HOST:
e47d9254	99	musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
032ec49f	100	musb->is_active = otg->host->b_hnp_enable;
550a7375 FB	101	musb_platform_try_idle(musb, 0);
550a7375 FB	102	break;
550a7375	103	default:
b99d3659	104	musb_dbg(musb, "bogus rh suspend? %s",
e47d9254	105	usb_otg_state_string(musb->xceiv->otg->state));
550a7375 FB	106	}
	107	} else if (power & MUSB_POWER_SUSPENDM) {
	108	power &= ~MUSB_POWER_SUSPENDM;
	109	power \|= MUSB_POWER_RESUME;
	110	musb_writeb(mbase, MUSB_POWER, power);
	111
b99d3659	112	musb_dbg(musb, "Root port resuming, power %02x", power);
550a7375	113
550a7375	114	musb->port1_status \|= MUSB_PORT_STAT_RESUME;
f2dece44	115	schedule_delayed_work(&musb->finish_resume_work,
309be239	116	msecs_to_jiffies(USB_RESUME_TIMEOUT));
550a7375	117	}
ebc3dd68	118	return 0;
550a7375 FB	119	}
550a7375 FB	120
869c5978	121	void musb_port_reset(struct musb *musb, bool do_reset)
550a7375 FB	122	{
	123	u8 power;
	124	void __iomem *mbase = musb->mregs;
	125
e47d9254	126	if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
b99d3659	127	musb_dbg(musb, "HNP: Returning from HNP; no hub reset from b_idle");
550a7375 FB	128	musb->port1_status &= ~USB_PORT_STAT_RESET;
	129	return;
	130	}
550a7375 FB	131
	132	if (!is_host_active(musb))
	133	return;
	134
	135	/* NOTE: caller guarantees it will turn off the reset when
	136	* the appropriate amount of time has passed
	137	*/
	138	power = musb_readb(mbase, MUSB_POWER);
	139	if (do_reset) {
550a7375 FB	140	/*
	141	* If RESUME is set, we must make sure it stays minimum 20 ms.
	142	* Then we must clear RESUME and wait a bit to let musb start
	143	* generating SOFs. If we don't do this, OPT HS A 6.8 tests
	144	* fail with "Error! Did not receive an SOF before suspend
	145	* detected".
	146	*/
	147	if (power & MUSB_POWER_RESUME) {
73926db3 DM	148	long remain = (unsigned long) musb->rh_timer - jiffies;
	149
	150	if (musb->rh_timer > 0 && remain > 0) {
	151	/* take into account the minimum delay after resume */
	152	schedule_delayed_work(
f2dece44	153	&musb->deassert_reset_work, remain);
73926db3 DM	154	return;
	155	}
	156
550a7375	157	musb_writeb(mbase, MUSB_POWER,
73926db3 DM	158	power & ~MUSB_POWER_RESUME);
	159
	160	/* Give the core 1 ms to clear MUSB_POWER_RESUME */
f2dece44 DM	161	schedule_delayed_work(&musb->deassert_reset_work,
f2dece44 DM	162	msecs_to_jiffies(1));
73926db3	163	return;
550a7375 FB	164	}
550a7375 FB	165
550a7375 FB	166	power &= 0xf0;
	167	musb_writeb(mbase, MUSB_POWER,
	168	power \| MUSB_POWER_RESET);
	169
	170	musb->port1_status \|= USB_PORT_STAT_RESET;
	171	musb->port1_status &= ~USB_PORT_STAT_ENABLE;
f2dece44 DM	172	schedule_delayed_work(&musb->deassert_reset_work,
f2dece44 DM	173	msecs_to_jiffies(50));
550a7375	174	} else {
b99d3659	175	musb_dbg(musb, "root port reset stopped");
591fa9dd	176	musb_platform_pre_root_reset_end(musb);
550a7375 FB	177	musb_writeb(mbase, MUSB_POWER,
550a7375 FB	178	power & ~MUSB_POWER_RESET);
591fa9dd	179	musb_platform_post_root_reset_end(musb);
550a7375	180
550a7375 FB	181	power = musb_readb(mbase, MUSB_POWER);
550a7375 FB	182	if (power & MUSB_POWER_HSMODE) {
b99d3659	183	musb_dbg(musb, "high-speed device connected");
550a7375 FB	184	musb->port1_status \|= USB_PORT_STAT_HIGH_SPEED;
	185	}
	186
	187	musb->port1_status &= ~USB_PORT_STAT_RESET;
	188	musb->port1_status \|= USB_PORT_STAT_ENABLE
	189	\| (USB_PORT_STAT_C_RESET << 16)
	190	\| (USB_PORT_STAT_C_ENABLE << 16);
8b125df5	191	usb_hcd_poll_rh_status(musb->hcd);
550a7375 FB	192
	193	musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
	194	}
	195	}
	196
	197	void musb_root_disconnect(struct musb *musb)
	198	{
d445b6da HK	199	struct usb_otg *otg = musb->xceiv->otg;
d445b6da HK	200
749da5f8 AS	201	musb->port1_status = USB_PORT_STAT_POWER
749da5f8 AS	202	\| (USB_PORT_STAT_C_CONNECTION << 16);
550a7375	203
8b125df5	204	usb_hcd_poll_rh_status(musb->hcd);
550a7375 FB	205	musb->is_active = 0;
550a7375 FB	206
e47d9254	207	switch (musb->xceiv->otg->state) {
550a7375	208	case OTG_STATE_A_SUSPEND:
032ec49f	209	if (otg->host->b_hnp_enable) {
e47d9254	210	musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
1de00dae DB	211	musb->g.is_a_peripheral = 1;
	212	break;
	213	}
df561f66	214	fallthrough;
1de00dae	215	case OTG_STATE_A_HOST:
e47d9254	216	musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
550a7375 FB	217	musb->is_active = 0;
	218	break;
	219	case OTG_STATE_A_WAIT_VFALL:
e47d9254	220	musb->xceiv->otg->state = OTG_STATE_B_IDLE;
550a7375 FB	221	break;
550a7375 FB	222	default:
b99d3659	223	musb_dbg(musb, "host disconnect (%s)",
e47d9254	224	usb_otg_state_string(musb->xceiv->otg->state));
550a7375 FB	225	}
550a7375 FB	226	}
b36df090	227	EXPORT_SYMBOL_GPL(musb_root_disconnect);
550a7375 FB	228
	229
	230	/---------------------------------------------------------------------/
	231
	232	/* Caller may or may not hold musb->lock */
	233	int musb_hub_status_data(struct usb_hcd hcd, char buf)
	234	{
	235	struct musb *musb = hcd_to_musb(hcd);
	236	int retval = 0;
	237
	238	/* called in_irq() via usb_hcd_poll_rh_status() */
	239	if (musb->port1_status & 0xffff0000) {
	240	*buf = 0x02;
	241	retval = 1;
	242	}
	243	return retval;
	244	}
	245
ae44df2e SAS	246	static int musb_has_gadget(struct musb *musb)
	247	{
	248	/*
	249	* In host-only mode we start a connection right away. In OTG mode
	250	* we have to wait until we loaded a gadget. We don't really need a
	251	* gadget if we operate as a host but we should not start a session
	252	* as a device without a gadget or else we explode.
	253	*/
	254	#ifdef CONFIG_USB_MUSB_HOST
	255	return 1;
	256	#else
7ad76955	257	return musb->port_mode == MUSB_HOST;
ae44df2e SAS	258	#endif
	259	}
	260
550a7375 FB	261	int musb_hub_control(
	262	struct usb_hcd *hcd,
	263	u16 typeReq,
	264	u16 wValue,
	265	u16 wIndex,
	266	char *buf,
	267	u16 wLength)
	268	{
	269	struct musb *musb = hcd_to_musb(hcd);
	270	u32 temp;
	271	int retval = 0;
	272	unsigned long flags;
2c557540	273	bool start_musb = false;
550a7375 FB	274
	275	spin_lock_irqsave(&musb->lock, flags);
	276
541c7d43	277	if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
550a7375 FB	278	spin_unlock_irqrestore(&musb->lock, flags);
	279	return -ESHUTDOWN;
	280	}
	281
	282	/* hub features: always zero, setting is a NOP
	283	* port features: reported, sometimes updated when host is active
	284	* no indicators
	285	*/
	286	switch (typeReq) {
	287	case ClearHubFeature:
	288	case SetHubFeature:
	289	switch (wValue) {
	290	case C_HUB_OVER_CURRENT:
	291	case C_HUB_LOCAL_POWER:
	292	break;
	293	default:
	294	goto error;
	295	}
	296	break;
	297	case ClearPortFeature:
	298	if ((wIndex & 0xff) != 1)
	299	goto error;
	300
	301	switch (wValue) {
	302	case USB_PORT_FEAT_ENABLE:
	303	break;
	304	case USB_PORT_FEAT_SUSPEND:
	305	musb_port_suspend(musb, false);
	306	break;
	307	case USB_PORT_FEAT_POWER:
032ec49f	308	if (!hcd->self.is_b_host)
743411b3	309	musb_platform_set_vbus(musb, 0);
550a7375 FB	310	break;
	311	case USB_PORT_FEAT_C_CONNECTION:
	312	case USB_PORT_FEAT_C_ENABLE:
	313	case USB_PORT_FEAT_C_OVER_CURRENT:
	314	case USB_PORT_FEAT_C_RESET:
	315	case USB_PORT_FEAT_C_SUSPEND:
	316	break;
	317	default:
	318	goto error;
	319	}
b99d3659	320	musb_dbg(musb, "clear feature %d", wValue);
550a7375 FB	321	musb->port1_status &= ~(1 << wValue);
	322	break;
	323	case GetHubDescriptor:
	324	{
	325	struct usb_hub_descriptor desc = (void )buf;
	326
	327	desc->bDescLength = 9;
e95af3aa	328	desc->bDescriptorType = USB_DT_HUB;
550a7375	329	desc->bNbrPorts = 1;
551509d2	330	desc->wHubCharacteristics = cpu_to_le16(
c509ba6e SS	331	HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
	332	\| HUB_CHAR_NO_OCPM /* no overcurrent reporting */
	333	);
550a7375 FB	334	desc->bPwrOn2PwrGood = 5; /* msec/2 */
	335	desc->bHubContrCurrent = 0;
	336
	337	/* workaround bogus struct definition */
dbe79bbe JY	338	desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
dbe79bbe JY	339	desc->u.hs.DeviceRemovable[1] = 0xff;
550a7375 FB	340	}
	341	break;
	342	case GetHubStatus:
	343	temp = 0;
	344	(__le32 ) buf = cpu_to_le32(temp);
	345	break;
	346	case GetPortStatus:
	347	if (wIndex != 1)
	348	goto error;
	349
550a7375 FB	350	put_unaligned(cpu_to_le32(musb->port1_status
	351	& ~MUSB_PORT_STAT_RESUME),
	352	(__le32 *) buf);
	353
	354	/* port change status is more interesting */
b99d3659	355	musb_dbg(musb, "port status %08x", musb->port1_status);
550a7375 FB	356	break;
	357	case SetPortFeature:
	358	if ((wIndex & 0xff) != 1)
	359	goto error;
	360
	361	switch (wValue) {
	362	case USB_PORT_FEAT_POWER:
	363	/* NOTE: this controller has a strange state machine
	364	* that involves "requesting sessions" according to
	365	* magic side effects from incompletely-described
	366	* rules about startup...
	367	*
	368	* This call is what really starts the host mode; be
	369	* very careful about side effects if you reorder any
	370	* initialization logic, e.g. for OTG, or change any
	371	* logic relating to VBUS power-up.
	372	*/
ae44df2e	373	if (!hcd->self.is_b_host && musb_has_gadget(musb))
2c557540	374	start_musb = true;
550a7375 FB	375	break;
	376	case USB_PORT_FEAT_RESET:
	377	musb_port_reset(musb, true);
	378	break;
	379	case USB_PORT_FEAT_SUSPEND:
	380	musb_port_suspend(musb, true);
	381	break;
	382	case USB_PORT_FEAT_TEST:
	383	if (unlikely(is_host_active(musb)))
	384	goto error;
	385
	386	wIndex >>= 8;
	387	switch (wIndex) {
62fb45d3 GKH	388	case USB_TEST_J:
62fb45d3 GKH	389	pr_debug("USB_TEST_J\n");
550a7375 FB	390	temp = MUSB_TEST_J;
550a7375 FB	391	break;
62fb45d3 GKH	392	case USB_TEST_K:
62fb45d3 GKH	393	pr_debug("USB_TEST_K\n");
550a7375 FB	394	temp = MUSB_TEST_K;
550a7375 FB	395	break;
62fb45d3 GKH	396	case USB_TEST_SE0_NAK:
62fb45d3 GKH	397	pr_debug("USB_TEST_SE0_NAK\n");
550a7375 FB	398	temp = MUSB_TEST_SE0_NAK;
550a7375 FB	399	break;
62fb45d3 GKH	400	case USB_TEST_PACKET:
62fb45d3 GKH	401	pr_debug("USB_TEST_PACKET\n");
550a7375 FB	402	temp = MUSB_TEST_PACKET;
	403	musb_load_testpacket(musb);
	404	break;
62fb45d3 GKH	405	case USB_TEST_FORCE_ENABLE:
62fb45d3 GKH	406	pr_debug("USB_TEST_FORCE_ENABLE\n");
550a7375 FB	407	temp = MUSB_TEST_FORCE_HOST
	408	\| MUSB_TEST_FORCE_HS;
	409
	410	musb_writeb(musb->mregs, MUSB_DEVCTL,
	411	MUSB_DEVCTL_SESSION);
	412	break;
	413	case 6:
	414	pr_debug("TEST_FIFO_ACCESS\n");
	415	temp = MUSB_TEST_FIFO_ACCESS;
	416	break;
	417	default:
	418	goto error;
	419	}
	420	musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
	421	break;
	422	default:
	423	goto error;
	424	}
b99d3659	425	musb_dbg(musb, "set feature %d", wValue);
550a7375 FB	426	musb->port1_status \|= 1 << wValue;
	427	break;
	428
	429	default:
	430	error:
	431	/* "protocol stall" on error */
	432	retval = -EPIPE;
	433	}
	434	spin_unlock_irqrestore(&musb->lock, flags);
2c557540 TL	435
	436	if (start_musb)
	437	musb_start(musb);
	438
550a7375 FB	439	return retval;
550a7375 FB	440	}