[deliverable/linux.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"

/*
* Program the HDRC to start (enable interrupts, dma, etc.).
*/
static void musb_start(struct musb *musb)
{
	void __iomem	*regs = musb->mregs;
	u8		devctl = musb_readb(regs, MUSB_DEVCTL);

	dev_dbg(musb->controller, "<== devctl %02x\n", devctl);

	/*  Set INT enable registers, enable interrupts */
	musb->intrtxe = musb->epmask;
	musb_writew(regs, MUSB_INTRTXE, musb->intrtxe);
	musb->intrrxe = musb->epmask & 0xfffe;
	musb_writew(regs, MUSB_INTRRXE, musb->intrrxe);
	musb_writeb(regs, MUSB_INTRUSBE, 0xf7);

	musb_writeb(regs, MUSB_TESTMODE, 0);

	/* put into basic highspeed mode and start session */
	musb_writeb(regs, MUSB_POWER, MUSB_POWER_ISOUPDATE
						| MUSB_POWER_HSENAB
						/* ENSUSPEND wedges tusb */
						/* | MUSB_POWER_ENSUSPEND */
						);

	musb->is_active = 0;
	devctl = musb_readb(regs, MUSB_DEVCTL);
	devctl &= ~MUSB_DEVCTL_SESSION;

	/* session started after:
	 * (a) ID-grounded irq, host mode;
	 * (b) vbus present/connect IRQ, peripheral mode;
	 * (c) peripheral initiates, using SRP
	 */
	if (musb->port_mode != MUSB_PORT_MODE_HOST &&
	    (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
		musb->is_active = 1;
	} else {
		devctl |= MUSB_DEVCTL_SESSION;
	}

	musb_platform_enable(musb);
	musb_writeb(regs, MUSB_DEVCTL, devctl);
}

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 = 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 = otg->host->b_hnp_enable;
			musb_platform_try_idle(musb, 0);
			break;
		default:
			dev_dbg(musb->controller, "bogus rh suspend? %s\n",
				usb_otg_state_string(musb->xceiv->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);
		}

		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);

		power = musb_readb(mbase, MUSB_POWER);
		if (power & MUSB_POWER_HSMODE) {
			dev_dbg(musb->controller, "high-speed device connected\n");
			musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
		}

		musb->port1_status &= ~USB_PORT_STAT_RESET;
		musb->port1_status |= USB_PORT_STAT_ENABLE
					| (USB_PORT_STAT_C_RESET << 16)
					| (USB_PORT_STAT_C_ENABLE << 16);
		usb_hcd_poll_rh_status(musb->hcd);

		musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
	}
}

void musb_root_disconnect(struct musb *musb)
{
	struct usb_otg	*otg = musb->xceiv->otg;

	musb->port1_status = USB_PORT_STAT_POWER
			| (USB_PORT_STAT_C_CONNECTION << 16);

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

	switch (musb->xceiv->state) {
	case OTG_STATE_A_SUSPEND:
		if (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",
			usb_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;
}

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
	if (musb->port_mode == MUSB_PORT_MODE_HOST)
		return 1;
	return musb->g.dev.driver != NULL;
#endif
}

int musb_hub_control(
	struct usb_hcd	*hcd,
	u16		typeReq,
	u16		wValue,
	u16		wIndex,
	char		*buf,
	u16		wLength)
{
	struct musb	*musb = hcd_to_musb(hcd);
	u32		temp;
	int		retval = 0;
	unsigned long	flags;

	spin_lock_irqsave(&musb->lock, flags);

	if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
		spin_unlock_irqrestore(&musb->lock, flags);
		return -ESHUTDOWN;
	}

	/* hub features:  always zero, setting is a NOP
	 * port features: reported, sometimes updated when host is active
	 * no indicators
	 */
	switch (typeReq) {
	case ClearHubFeature:
	case SetHubFeature:
		switch (wValue) {
		case C_HUB_OVER_CURRENT:
		case C_HUB_LOCAL_POWER:
			break;
		default:
			goto error;
		}
		break;
	case ClearPortFeature:
		if ((wIndex & 0xff) != 1)
			goto error;

		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
			break;
		case USB_PORT_FEAT_SUSPEND:
			musb_port_suspend(musb, false);
			break;
		case USB_PORT_FEAT_POWER:
			if (!hcd->self.is_b_host)
				musb_platform_set_vbus(musb, 0);
			break;
		case USB_PORT_FEAT_C_CONNECTION:
		case USB_PORT_FEAT_C_ENABLE:
		case USB_PORT_FEAT_C_OVER_CURRENT:
		case USB_PORT_FEAT_C_RESET:
		case USB_PORT_FEAT_C_SUSPEND:
			break;
		default:
			goto error;
		}
		dev_dbg(musb->controller, "clear feature %d\n", wValue);
		musb->port1_status &= ~(1 << wValue);
		break;
	case GetHubDescriptor:
		{
		struct usb_hub_descriptor *desc = (void *)buf;

		desc->bDescLength = 9;
		desc->bDescriptorType = 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->hcd);
			/* 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 (!hcd->self.is_b_host && musb_has_gadget(musb))
				musb_start(musb);
			break;
		case USB_PORT_FEAT_RESET:
			musb_port_reset(musb, true);
			break;
		case USB_PORT_FEAT_SUSPEND:
			musb_port_suspend(musb, true);
			break;
		case USB_PORT_FEAT_TEST:
			if (unlikely(is_host_active(musb)))
				goto error;

			wIndex >>= 8;
			switch (wIndex) {
			case 1:
				pr_debug("TEST_J\n");
				temp = MUSB_TEST_J;
				break;
			case 2:
				pr_debug("TEST_K\n");
				temp = MUSB_TEST_K;
				break;
			case 3:
				pr_debug("TEST_SE0_NAK\n");
				temp = MUSB_TEST_SE0_NAK;
				break;
			case 4:
				pr_debug("TEST_PACKET\n");
				temp = MUSB_TEST_PACKET;
				musb_load_testpacket(musb);
				break;
			case 5:
				pr_debug("TEST_FORCE_ENABLE\n");
				temp = MUSB_TEST_FORCE_HOST
					| MUSB_TEST_FORCE_HS;

				musb_writeb(musb->mregs, MUSB_DEVCTL,
						MUSB_DEVCTL_SESSION);
				break;
			case 6:
				pr_debug("TEST_FIFO_ACCESS\n");
				temp = MUSB_TEST_FIFO_ACCESS;
				break;
			default:
				goto error;
			}
			musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
			break;
		default:
			goto error;
		}
		dev_dbg(musb->controller, "set feature %d\n", wValue);
		musb->port1_status |= 1 << wValue;
		break;

	default:
error:
		/* "protocol stall" on error */
		retval = -EPIPE;
	}
	spin_unlock_irqrestore(&musb->lock, flags);
	return retval;
}
Commit	Line	Data
550a7375 FB	1	/*
	2	* MUSB OTG driver virtual root hub support
	3	*
	4	* Copyright 2005 Mentor Graphics Corporation
	5	* Copyright (C) 2005-2006 by Texas Instruments
	6	* Copyright (C) 2006-2007 Nokia Corporation
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
	25	* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	26	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	27	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	28	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
	29	* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	30	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	31	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	32	*
	33	*/
	34
	35	#include <linux/module.h>
	36	#include <linux/kernel.h>
	37	#include <linux/sched.h>
550a7375 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
69ae2a70 DM	47	/*
	48	* Program the HDRC to start (enable interrupts, dma, etc.).
	49	*/
	50	static void musb_start(struct musb *musb)
	51	{
	52	void __iomem *regs = musb->mregs;
	53	u8 devctl = musb_readb(regs, MUSB_DEVCTL);
	54
	55	dev_dbg(musb->controller, "<== devctl %02x\n", devctl);
	56
	57	/* Set INT enable registers, enable interrupts */
	58	musb->intrtxe = musb->epmask;
	59	musb_writew(regs, MUSB_INTRTXE, musb->intrtxe);
	60	musb->intrrxe = musb->epmask & 0xfffe;
	61	musb_writew(regs, MUSB_INTRRXE, musb->intrrxe);
	62	musb_writeb(regs, MUSB_INTRUSBE, 0xf7);
	63
	64	musb_writeb(regs, MUSB_TESTMODE, 0);
	65
	66	/* put into basic highspeed mode and start session */
	67	musb_writeb(regs, MUSB_POWER, MUSB_POWER_ISOUPDATE
	68	\| MUSB_POWER_HSENAB
	69	/* ENSUSPEND wedges tusb */
	70	/* \| MUSB_POWER_ENSUSPEND */
	71	);
	72
	73	musb->is_active = 0;
	74	devctl = musb_readb(regs, MUSB_DEVCTL);
	75	devctl &= ~MUSB_DEVCTL_SESSION;
	76
	77	/* session started after:
	78	* (a) ID-grounded irq, host mode;
	79	* (b) vbus present/connect IRQ, peripheral mode;
	80	* (c) peripheral initiates, using SRP
	81	*/
6c5f6a6f DM	82	if (musb->port_mode != MUSB_PORT_MODE_HOST &&
6c5f6a6f DM	83	(devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
69ae2a70 DM	84	musb->is_active = 1;
	85	} else {
	86	devctl \|= MUSB_DEVCTL_SESSION;
	87	}
	88
	89	musb_platform_enable(musb);
	90	musb_writeb(regs, MUSB_DEVCTL, devctl);
	91	}
550a7375 FB	92
	93	static void musb_port_suspend(struct musb *musb, bool do_suspend)
	94	{
d445b6da	95	struct usb_otg *otg = musb->xceiv->otg;
550a7375 FB	96	u8 power;
	97	void __iomem *mbase = musb->mregs;
	98
	99	if (!is_host_active(musb))
	100	return;
	101
	102	/* NOTE: this doesn't necessarily put PHY into low power mode,
	103	* turning off its clock; that's a function of PHY integration and
	104	* MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
	105	* SE0 changing to connect (J) or wakeup (K) states.
	106	*/
	107	power = musb_readb(mbase, MUSB_POWER);
	108	if (do_suspend) {
	109	int retries = 10000;
	110
	111	power &= ~MUSB_POWER_RESUME;
	112	power \|= MUSB_POWER_SUSPENDM;
	113	musb_writeb(mbase, MUSB_POWER, power);
	114
	115	/* Needed for OPT A tests */
	116	power = musb_readb(mbase, MUSB_POWER);
	117	while (power & MUSB_POWER_SUSPENDM) {
	118	power = musb_readb(mbase, MUSB_POWER);
	119	if (retries-- < 1)
	120	break;
	121	}
	122
5c8a86e1	123	dev_dbg(musb->controller, "Root port suspended, power %02x\n", power);
550a7375 FB	124
550a7375 FB	125	musb->port1_status \|= USB_PORT_STAT_SUSPEND;
84e250ff	126	switch (musb->xceiv->state) {
550a7375	127	case OTG_STATE_A_HOST:
84e250ff	128	musb->xceiv->state = OTG_STATE_A_SUSPEND;
032ec49f	129	musb->is_active = otg->host->b_hnp_enable;
ab983f2a DB	130	if (musb->is_active)
	131	mod_timer(&musb->otg_timer, jiffies
	132	+ msecs_to_jiffies(
	133	OTG_TIME_A_AIDL_BDIS));
550a7375 FB	134	musb_platform_try_idle(musb, 0);
550a7375 FB	135	break;
550a7375	136	case OTG_STATE_B_HOST:
84e250ff	137	musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
032ec49f	138	musb->is_active = otg->host->b_hnp_enable;
550a7375 FB	139	musb_platform_try_idle(musb, 0);
550a7375 FB	140	break;
550a7375	141	default:
5c8a86e1	142	dev_dbg(musb->controller, "bogus rh suspend? %s\n",
42c0bf1c	143	usb_otg_state_string(musb->xceiv->state));
550a7375 FB	144	}
	145	} else if (power & MUSB_POWER_SUSPENDM) {
	146	power &= ~MUSB_POWER_SUSPENDM;
	147	power \|= MUSB_POWER_RESUME;
	148	musb_writeb(mbase, MUSB_POWER, power);
	149
5c8a86e1	150	dev_dbg(musb->controller, "Root port resuming, power %02x\n", power);
550a7375 FB	151
	152	/* later, GetPortStatus will stop RESUME signaling */
	153	musb->port1_status \|= MUSB_PORT_STAT_RESUME;
	154	musb->rh_timer = jiffies + msecs_to_jiffies(20);
	155	}
	156	}
	157
	158	static void musb_port_reset(struct musb *musb, bool do_reset)
	159	{
	160	u8 power;
	161	void __iomem *mbase = musb->mregs;
	162
84e250ff	163	if (musb->xceiv->state == OTG_STATE_B_IDLE) {
5c8a86e1	164	dev_dbg(musb->controller, "HNP: Returning from HNP; no hub reset from b_idle\n");
550a7375 FB	165	musb->port1_status &= ~USB_PORT_STAT_RESET;
	166	return;
	167	}
550a7375 FB	168
	169	if (!is_host_active(musb))
	170	return;
	171
	172	/* NOTE: caller guarantees it will turn off the reset when
	173	* the appropriate amount of time has passed
	174	*/
	175	power = musb_readb(mbase, MUSB_POWER);
	176	if (do_reset) {
	177
	178	/*
	179	* If RESUME is set, we must make sure it stays minimum 20 ms.
	180	* Then we must clear RESUME and wait a bit to let musb start
	181	* generating SOFs. If we don't do this, OPT HS A 6.8 tests
	182	* fail with "Error! Did not receive an SOF before suspend
	183	* detected".
	184	*/
	185	if (power & MUSB_POWER_RESUME) {
	186	while (time_before(jiffies, musb->rh_timer))
	187	msleep(1);
	188	musb_writeb(mbase, MUSB_POWER,
	189	power & ~MUSB_POWER_RESUME);
	190	msleep(1);
	191	}
	192
550a7375 FB	193	power &= 0xf0;
	194	musb_writeb(mbase, MUSB_POWER,
	195	power \| MUSB_POWER_RESET);
	196
	197	musb->port1_status \|= USB_PORT_STAT_RESET;
	198	musb->port1_status &= ~USB_PORT_STAT_ENABLE;
	199	musb->rh_timer = jiffies + msecs_to_jiffies(50);
	200	} else {
5c8a86e1	201	dev_dbg(musb->controller, "root port reset stopped\n");
550a7375 FB	202	musb_writeb(mbase, MUSB_POWER,
	203	power & ~MUSB_POWER_RESET);
	204
550a7375 FB	205	power = musb_readb(mbase, MUSB_POWER);
550a7375 FB	206	if (power & MUSB_POWER_HSMODE) {
5c8a86e1	207	dev_dbg(musb->controller, "high-speed device connected\n");
550a7375 FB	208	musb->port1_status \|= USB_PORT_STAT_HIGH_SPEED;
	209	}
	210
	211	musb->port1_status &= ~USB_PORT_STAT_RESET;
	212	musb->port1_status \|= USB_PORT_STAT_ENABLE
	213	\| (USB_PORT_STAT_C_RESET << 16)
	214	\| (USB_PORT_STAT_C_ENABLE << 16);
8b125df5	215	usb_hcd_poll_rh_status(musb->hcd);
550a7375 FB	216
	217	musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
	218	}
	219	}
	220
	221	void musb_root_disconnect(struct musb *musb)
	222	{
d445b6da HK	223	struct usb_otg *otg = musb->xceiv->otg;
d445b6da HK	224
749da5f8 AS	225	musb->port1_status = USB_PORT_STAT_POWER
749da5f8 AS	226	\| (USB_PORT_STAT_C_CONNECTION << 16);
550a7375	227
8b125df5	228	usb_hcd_poll_rh_status(musb->hcd);
550a7375 FB	229	musb->is_active = 0;
550a7375 FB	230
84e250ff	231	switch (musb->xceiv->state) {
550a7375	232	case OTG_STATE_A_SUSPEND:
032ec49f	233	if (otg->host->b_hnp_enable) {
1de00dae DB	234	musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
	235	musb->g.is_a_peripheral = 1;
	236	break;
	237	}
1de00dae DB	238	/* FALLTHROUGH */
1de00dae DB	239	case OTG_STATE_A_HOST:
84e250ff	240	musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
550a7375 FB	241	musb->is_active = 0;
	242	break;
	243	case OTG_STATE_A_WAIT_VFALL:
84e250ff	244	musb->xceiv->state = OTG_STATE_B_IDLE;
550a7375 FB	245	break;
550a7375 FB	246	default:
5c8a86e1	247	dev_dbg(musb->controller, "host disconnect (%s)\n",
42c0bf1c	248	usb_otg_state_string(musb->xceiv->state));
550a7375 FB	249	}
	250	}
	251
	252
	253	/---------------------------------------------------------------------/
	254
	255	/* Caller may or may not hold musb->lock */
	256	int musb_hub_status_data(struct usb_hcd hcd, char buf)
	257	{
	258	struct musb *musb = hcd_to_musb(hcd);
	259	int retval = 0;
	260
	261	/* called in_irq() via usb_hcd_poll_rh_status() */
	262	if (musb->port1_status & 0xffff0000) {
	263	*buf = 0x02;
	264	retval = 1;
	265	}
	266	return retval;
	267	}
	268
ae44df2e SAS	269	static int musb_has_gadget(struct musb *musb)
	270	{
	271	/*
	272	* In host-only mode we start a connection right away. In OTG mode
	273	* we have to wait until we loaded a gadget. We don't really need a
	274	* gadget if we operate as a host but we should not start a session
	275	* as a device without a gadget or else we explode.
	276	*/
	277	#ifdef CONFIG_USB_MUSB_HOST
	278	return 1;
	279	#else
	280	if (musb->port_mode == MUSB_PORT_MODE_HOST)
	281	return 1;
	282	return musb->g.dev.driver != NULL;
	283	#endif
	284	}
	285
550a7375 FB	286	int musb_hub_control(
	287	struct usb_hcd *hcd,
	288	u16 typeReq,
	289	u16 wValue,
	290	u16 wIndex,
	291	char *buf,
	292	u16 wLength)
	293	{
	294	struct musb *musb = hcd_to_musb(hcd);
	295	u32 temp;
	296	int retval = 0;
	297	unsigned long flags;
	298
	299	spin_lock_irqsave(&musb->lock, flags);
	300
541c7d43	301	if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
550a7375 FB	302	spin_unlock_irqrestore(&musb->lock, flags);
	303	return -ESHUTDOWN;
	304	}
	305
	306	/* hub features: always zero, setting is a NOP
	307	* port features: reported, sometimes updated when host is active
	308	* no indicators
	309	*/
	310	switch (typeReq) {
	311	case ClearHubFeature:
	312	case SetHubFeature:
	313	switch (wValue) {
	314	case C_HUB_OVER_CURRENT:
	315	case C_HUB_LOCAL_POWER:
	316	break;
	317	default:
	318	goto error;
	319	}
	320	break;
	321	case ClearPortFeature:
	322	if ((wIndex & 0xff) != 1)
	323	goto error;
	324
	325	switch (wValue) {
	326	case USB_PORT_FEAT_ENABLE:
	327	break;
	328	case USB_PORT_FEAT_SUSPEND:
	329	musb_port_suspend(musb, false);
	330	break;
	331	case USB_PORT_FEAT_POWER:
032ec49f	332	if (!hcd->self.is_b_host)
743411b3	333	musb_platform_set_vbus(musb, 0);
550a7375 FB	334	break;
	335	case USB_PORT_FEAT_C_CONNECTION:
	336	case USB_PORT_FEAT_C_ENABLE:
	337	case USB_PORT_FEAT_C_OVER_CURRENT:
	338	case USB_PORT_FEAT_C_RESET:
	339	case USB_PORT_FEAT_C_SUSPEND:
	340	break;
	341	default:
	342	goto error;
	343	}
5c8a86e1	344	dev_dbg(musb->controller, "clear feature %d\n", wValue);
550a7375 FB	345	musb->port1_status &= ~(1 << wValue);
	346	break;
	347	case GetHubDescriptor:
	348	{
	349	struct usb_hub_descriptor desc = (void )buf;
	350
	351	desc->bDescLength = 9;
	352	desc->bDescriptorType = 0x29;
	353	desc->bNbrPorts = 1;
551509d2	354	desc->wHubCharacteristics = cpu_to_le16(
550a7375 FB	355	0x0001 /* per-port power switching */
	356	\| 0x0010 /* no overcurrent reporting */
	357	);
	358	desc->bPwrOn2PwrGood = 5; /* msec/2 */
	359	desc->bHubContrCurrent = 0;
	360
	361	/* workaround bogus struct definition */
dbe79bbe JY	362	desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
dbe79bbe JY	363	desc->u.hs.DeviceRemovable[1] = 0xff;
550a7375 FB	364	}
	365	break;
	366	case GetHubStatus:
	367	temp = 0;
	368	(__le32 ) buf = cpu_to_le32(temp);
	369	break;
	370	case GetPortStatus:
	371	if (wIndex != 1)
	372	goto error;
	373
	374	/* finish RESET signaling? */
	375	if ((musb->port1_status & USB_PORT_STAT_RESET)
	376	&& time_after_eq(jiffies, musb->rh_timer))
	377	musb_port_reset(musb, false);
	378
	379	/* finish RESUME signaling? */
	380	if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
	381	&& time_after_eq(jiffies, musb->rh_timer)) {
	382	u8 power;
	383
	384	power = musb_readb(musb->mregs, MUSB_POWER);
	385	power &= ~MUSB_POWER_RESUME;
5c8a86e1	386	dev_dbg(musb->controller, "root port resume stopped, power %02x\n",
550a7375 FB	387	power);
	388	musb_writeb(musb->mregs, MUSB_POWER, power);
	389
	390	/* ISSUE: DaVinci (RTL 1.300) disconnects after
	391	* resume of high speed peripherals (but not full
	392	* speed ones).
	393	*/
	394
	395	musb->is_active = 1;
	396	musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
	397	\| MUSB_PORT_STAT_RESUME);
	398	musb->port1_status \|= USB_PORT_STAT_C_SUSPEND << 16;
8b125df5	399	usb_hcd_poll_rh_status(musb->hcd);
550a7375	400	/* NOTE: it might really be A_WAIT_BCON ... */
84e250ff	401	musb->xceiv->state = OTG_STATE_A_HOST;
550a7375 FB	402	}
	403
	404	put_unaligned(cpu_to_le32(musb->port1_status
	405	& ~MUSB_PORT_STAT_RESUME),
	406	(__le32 *) buf);
	407
	408	/* port change status is more interesting */
5c8a86e1	409	dev_dbg(musb->controller, "port status %08x\n",
550a7375 FB	410	musb->port1_status);
	411	break;
	412	case SetPortFeature:
	413	if ((wIndex & 0xff) != 1)
	414	goto error;
	415
	416	switch (wValue) {
	417	case USB_PORT_FEAT_POWER:
	418	/* NOTE: this controller has a strange state machine
	419	* that involves "requesting sessions" according to
	420	* magic side effects from incompletely-described
	421	* rules about startup...
	422	*
	423	* This call is what really starts the host mode; be
	424	* very careful about side effects if you reorder any
	425	* initialization logic, e.g. for OTG, or change any
	426	* logic relating to VBUS power-up.
	427	*/
ae44df2e	428	if (!hcd->self.is_b_host && musb_has_gadget(musb))
550a7375 FB	429	musb_start(musb);
	430	break;
	431	case USB_PORT_FEAT_RESET:
	432	musb_port_reset(musb, true);
	433	break;
	434	case USB_PORT_FEAT_SUSPEND:
	435	musb_port_suspend(musb, true);
	436	break;
	437	case USB_PORT_FEAT_TEST:
	438	if (unlikely(is_host_active(musb)))
	439	goto error;
	440
	441	wIndex >>= 8;
	442	switch (wIndex) {
	443	case 1:
	444	pr_debug("TEST_J\n");
	445	temp = MUSB_TEST_J;
	446	break;
	447	case 2:
	448	pr_debug("TEST_K\n");
	449	temp = MUSB_TEST_K;
	450	break;
	451	case 3:
	452	pr_debug("TEST_SE0_NAK\n");
	453	temp = MUSB_TEST_SE0_NAK;
	454	break;
	455	case 4:
	456	pr_debug("TEST_PACKET\n");
	457	temp = MUSB_TEST_PACKET;
	458	musb_load_testpacket(musb);
	459	break;
	460	case 5:
	461	pr_debug("TEST_FORCE_ENABLE\n");
	462	temp = MUSB_TEST_FORCE_HOST
	463	\| MUSB_TEST_FORCE_HS;
	464
	465	musb_writeb(musb->mregs, MUSB_DEVCTL,
	466	MUSB_DEVCTL_SESSION);
	467	break;
	468	case 6:
	469	pr_debug("TEST_FIFO_ACCESS\n");
	470	temp = MUSB_TEST_FIFO_ACCESS;
	471	break;
	472	default:
	473	goto error;
	474	}
	475	musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
	476	break;
	477	default:
	478	goto error;
	479	}
5c8a86e1	480	dev_dbg(musb->controller, "set feature %d\n", wValue);
550a7375 FB	481	musb->port1_status \|= 1 << wValue;
	482	break;
	483
	484	default:
	485	error:
	486	/* "protocol stall" on error */
	487	retval = -EPIPE;
	488	}
	489	spin_unlock_irqrestore(&musb->lock, flags);
	490	return retval;
	491	}