[mirror_ubuntu-jammy-kernel.git] / drivers / usb / host / ohci-hub.c

/*
 * OHCI HCD (Host Controller Driver) for USB.
 * 
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
 * 
 * This file is licenced under GPL
 */

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

/*
 * OHCI Root Hub ... the nonsharable stuff
 */

#define dbg_port(hc,label,num,value) \
	ohci_dbg (hc, \
		"%s roothub.portstatus [%d] " \
		"= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
		label, num, temp, \
		(temp & RH_PS_PRSC) ? " PRSC" : "", \
		(temp & RH_PS_OCIC) ? " OCIC" : "", \
		(temp & RH_PS_PSSC) ? " PSSC" : "", \
		(temp & RH_PS_PESC) ? " PESC" : "", \
		(temp & RH_PS_CSC) ? " CSC" : "", \
 		\
		(temp & RH_PS_LSDA) ? " LSDA" : "", \
		(temp & RH_PS_PPS) ? " PPS" : "", \
		(temp & RH_PS_PRS) ? " PRS" : "", \
		(temp & RH_PS_POCI) ? " POCI" : "", \
		(temp & RH_PS_PSS) ? " PSS" : "", \
 		\
		(temp & RH_PS_PES) ? " PES" : "", \
		(temp & RH_PS_CCS) ? " CCS" : "" \
		);

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

/* hcd->hub_irq_enable() */
static void ohci_rhsc_enable (struct usb_hcd *hcd)
{
	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);

	spin_lock_irq(&ohci->lock);
	if (!ohci->autostop)
		del_timer(&hcd->rh_timer);	/* Prevent next poll */
	ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
	spin_unlock_irq(&ohci->lock);
}

#define OHCI_SCHED_ENABLES \
	(OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)

static void dl_done_list (struct ohci_hcd *);
static void finish_unlinks (struct ohci_hcd *, u16);

#ifdef	CONFIG_PM
static int ohci_restart(struct ohci_hcd *ohci);
#endif

static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
__releases(ohci->lock)
__acquires(ohci->lock)
{
	int			status = 0;

	ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
	switch (ohci->hc_control & OHCI_CTRL_HCFS) {
	case OHCI_USB_RESUME:
		ohci_dbg (ohci, "resume/suspend?\n");
		ohci->hc_control &= ~OHCI_CTRL_HCFS;
		ohci->hc_control |= OHCI_USB_RESET;
		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
		(void) ohci_readl (ohci, &ohci->regs->control);
		/* FALL THROUGH */
	case OHCI_USB_RESET:
		status = -EBUSY;
		ohci_dbg (ohci, "needs reinit!\n");
		goto done;
	case OHCI_USB_SUSPEND:
		if (!ohci->autostop) {
			ohci_dbg (ohci, "already suspended\n");
			goto done;
		}
	}
	ohci_dbg (ohci, "%s root hub\n",
			autostop ? "auto-stop" : "suspend");

	/* First stop any processing */
	if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
		ohci->hc_control &= ~OHCI_SCHED_ENABLES;
		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
		ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
		ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);

		/* sched disables take effect on the next frame,
		 * then the last WDH could take 6+ msec
		 */
		ohci_dbg (ohci, "stopping schedules ...\n");
		ohci->autostop = 0;
		spin_unlock_irq (&ohci->lock);
		msleep (8);
		spin_lock_irq (&ohci->lock);
	}
	dl_done_list (ohci);
	finish_unlinks (ohci, ohci_frame_no(ohci));

	/* maybe resume can wake root hub */
	if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev) ||
			autostop)
		ohci->hc_control |= OHCI_CTRL_RWE;
	else {
		ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);
		ohci->hc_control &= ~OHCI_CTRL_RWE;
	}

	/* Suspend hub ... this is the "global (to this bus) suspend" mode,
	 * which doesn't imply ports will first be individually suspended.
	 */
	ohci->hc_control &= ~OHCI_CTRL_HCFS;
	ohci->hc_control |= OHCI_USB_SUSPEND;
	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
	(void) ohci_readl (ohci, &ohci->regs->control);

	/* no resumes until devices finish suspending */
	if (!autostop) {
		ohci->next_statechange = jiffies + msecs_to_jiffies (5);
		ohci->autostop = 0;
	}

done:
	return status;
}

static inline struct ed *find_head (struct ed *ed)
{
	/* for bulk and control lists */
	while (ed->ed_prev)
		ed = ed->ed_prev;
	return ed;
}

/* caller has locked the root hub */
static int ohci_rh_resume (struct ohci_hcd *ohci)
__releases(ohci->lock)
__acquires(ohci->lock)
{
	struct usb_hcd		*hcd = ohci_to_hcd (ohci);
	u32			temp, enables;
	int			status = -EINPROGRESS;
	int			autostopped = ohci->autostop;

	ohci->autostop = 0;
	ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);

	if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
		/* this can happen after resuming a swsusp snapshot */
		if (hcd->state == HC_STATE_RESUMING) {
			ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
					ohci->hc_control);
			status = -EBUSY;
		/* this happens when pmcore resumes HC then root */
		} else {
			ohci_dbg (ohci, "duplicate resume\n");
			status = 0;
		}
	} else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
	case OHCI_USB_SUSPEND:
		ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
		ohci->hc_control |= OHCI_USB_RESUME;
		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
		(void) ohci_readl (ohci, &ohci->regs->control);
		ohci_dbg (ohci, "%s root hub\n",
				autostopped ? "auto-start" : "resume");
		break;
	case OHCI_USB_RESUME:
		/* HCFS changes sometime after INTR_RD */
		ohci_info(ohci, "%swakeup\n",
				autostopped ? "auto-" : "");
		break;
	case OHCI_USB_OPER:
		/* this can happen after resuming a swsusp snapshot */
		ohci_dbg (ohci, "snapshot resume? reinit\n");
		status = -EBUSY;
		break;
	default:		/* RESET, we lost power */
		ohci_dbg (ohci, "lost power\n");
		status = -EBUSY;
	}
#ifdef	CONFIG_PM
	if (status == -EBUSY) {
		if (!autostopped) {
			spin_unlock_irq (&ohci->lock);
			(void) ohci_init (ohci);
			status = ohci_restart (ohci);
			spin_lock_irq (&ohci->lock);
		}
		return status;
	}
#endif
	if (status != -EINPROGRESS)
		return status;
	if (autostopped)
		goto skip_resume;
	spin_unlock_irq (&ohci->lock);

	/* Some controllers (lucent erratum) need extra-long delays */
	msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);

	temp = ohci_readl (ohci, &ohci->regs->control);
	temp &= OHCI_CTRL_HCFS;
	if (temp != OHCI_USB_RESUME) {
		ohci_err (ohci, "controller won't resume\n");
		spin_lock_irq(&ohci->lock);
		return -EBUSY;
	}

	/* disable old schedule state, reinit from scratch */
	ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
	ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
	ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
	ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
	ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
	ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);

	/* Sometimes PCI D3 suspend trashes frame timings ... */
	periodic_reinit (ohci);

	/* the following code is executed with ohci->lock held and
	 * irqs disabled if and only if autostopped is true
	 */

skip_resume:
	/* interrupts might have been disabled */
	ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
	if (ohci->ed_rm_list)
		ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);

	/* Then re-enable operations */
	ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
	(void) ohci_readl (ohci, &ohci->regs->control);
	if (!autostopped)
		msleep (3);

	temp = ohci->hc_control;
	temp &= OHCI_CTRL_RWC;
	temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
	ohci->hc_control = temp;
	ohci_writel (ohci, temp, &ohci->regs->control);
	(void) ohci_readl (ohci, &ohci->regs->control);

	/* TRSMRCY */
	if (!autostopped) {
		msleep (10);
		spin_lock_irq (&ohci->lock);
	}
	/* now ohci->lock is always held and irqs are always disabled */

	/* keep it alive for more than ~5x suspend + resume costs */
	ohci->next_statechange = jiffies + STATECHANGE_DELAY;

	/* maybe turn schedules back on */
	enables = 0;
	temp = 0;
	if (!ohci->ed_rm_list) {
		if (ohci->ed_controltail) {
			ohci_writel (ohci,
					find_head (ohci->ed_controltail)->dma,
					&ohci->regs->ed_controlhead);
			enables |= OHCI_CTRL_CLE;
			temp |= OHCI_CLF;
		}
		if (ohci->ed_bulktail) {
			ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
				&ohci->regs->ed_bulkhead);
			enables |= OHCI_CTRL_BLE;
			temp |= OHCI_BLF;
		}
	}
	if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
		enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
	if (enables) {
		ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
		ohci->hc_control |= enables;
		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
		if (temp)
			ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
		(void) ohci_readl (ohci, &ohci->regs->control);
	}

	return 0;
}

#ifdef	CONFIG_PM

static int ohci_bus_suspend (struct usb_hcd *hcd)
{
	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
	int			rc;

	spin_lock_irq (&ohci->lock);

	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
		rc = -ESHUTDOWN;
	else
		rc = ohci_rh_suspend (ohci, 0);
	spin_unlock_irq (&ohci->lock);
	return rc;
}

static int ohci_bus_resume (struct usb_hcd *hcd)
{
	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
	int			rc;

	if (time_before (jiffies, ohci->next_statechange))
		msleep(5);

	spin_lock_irq (&ohci->lock);

	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
		rc = -ESHUTDOWN;
	else
		rc = ohci_rh_resume (ohci);
	spin_unlock_irq (&ohci->lock);

	/* poll until we know a device is connected or we autostop */
	if (rc == 0)
		usb_hcd_poll_rh_status(hcd);
	return rc;
}

#endif	/* CONFIG_PM */

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

/* build "status change" packet (one or two bytes) from HC registers */

static int
ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
{
	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
	int		i, changed = 0, length = 1;
	int		any_connected = 0;
	unsigned long	flags;

	spin_lock_irqsave (&ohci->lock, flags);

	/* undocumented erratum seen on at least rev D */
	if ((ohci->flags & OHCI_QUIRK_AMD756)
			&& (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
		ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
			  ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
		/* retry later; "should not happen" */
		goto done;
	}

	/* init status */
	if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
		buf [0] = changed = 1;
	else
		buf [0] = 0;
	if (ohci->num_ports > 7) {
		buf [1] = 0;
		length++;
	}

	/* look at each port */
	for (i = 0; i < ohci->num_ports; i++) {
		u32	status = roothub_portstatus (ohci, i);

		/* can't autostop if ports are connected */
		any_connected |= (status & RH_PS_CCS);

		if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
				| RH_PS_OCIC | RH_PS_PRSC)) {
			changed = 1;
			if (i < 7)
			    buf [0] |= 1 << (i + 1);
			else
			    buf [1] |= 1 << (i - 7);
		}
	}

	hcd->poll_rh = 1;

	/* carry out appropriate state changes */
	switch (ohci->hc_control & OHCI_CTRL_HCFS) {

	case OHCI_USB_OPER:
		/* keep on polling until we know a device is connected
		 * and RHSC is enabled */
		if (!ohci->autostop) {
			if (any_connected) {
				if (ohci_readl(ohci, &ohci->regs->intrenable) &
						OHCI_INTR_RHSC)
					hcd->poll_rh = 0;
			} else {
				ohci->autostop = 1;
				ohci->next_statechange = jiffies + HZ;
			}

		/* if no devices have been attached for one second, autostop */
		} else {
			if (changed || any_connected) {
				ohci->autostop = 0;
				ohci->next_statechange = jiffies +
						STATECHANGE_DELAY;
			} else if (device_may_wakeup(&hcd->self.root_hub->dev)
					&& time_after_eq(jiffies,
						ohci->next_statechange)
					&& !ohci->ed_rm_list
					&& !(ohci->hc_control &
						OHCI_SCHED_ENABLES)) {
				ohci_rh_suspend (ohci, 1);
			}
		}
		break;

	/* if there is a port change, autostart or ask to be resumed */
	case OHCI_USB_SUSPEND:
	case OHCI_USB_RESUME:
		if (changed) {
			if (ohci->autostop)
				ohci_rh_resume (ohci);
			else
				usb_hcd_resume_root_hub (hcd);
		} else {
			/* everything is idle, no need for polling */
			hcd->poll_rh = 0;
		}
		break;
	}

done:
	spin_unlock_irqrestore (&ohci->lock, flags);

	return changed ? length : 0;
}

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

static void
ohci_hub_descriptor (
	struct ohci_hcd			*ohci,
	struct usb_hub_descriptor	*desc
) {
	u32		rh = roothub_a (ohci);
	u16		temp;

	desc->bDescriptorType = 0x29;
	desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
	desc->bHubContrCurrent = 0;

	desc->bNbrPorts = ohci->num_ports;
	temp = 1 + (ohci->num_ports / 8);
	desc->bDescLength = 7 + 2 * temp;

	temp = 0;
	if (rh & RH_A_NPS)		/* no power switching? */
	    temp |= 0x0002;
	if (rh & RH_A_PSM) 		/* per-port power switching? */
	    temp |= 0x0001;
	if (rh & RH_A_NOCP)		/* no overcurrent reporting? */
	    temp |= 0x0010;
	else if (rh & RH_A_OCPM)	/* per-port overcurrent reporting? */
	    temp |= 0x0008;
	desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);

	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
	rh = roothub_b (ohci);
	memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
	desc->bitmap [0] = rh & RH_B_DR;
	if (ohci->num_ports > 7) {
		desc->bitmap [1] = (rh & RH_B_DR) >> 8;
		desc->bitmap [2] = 0xff;
	} else
		desc->bitmap [1] = 0xff;
}

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

#ifdef	CONFIG_USB_OTG

static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
{
	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
	u32			status;

	if (!port)
		return -EINVAL;
	port--;

	/* start port reset before HNP protocol times out */
	status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
	if (!(status & RH_PS_CCS))
		return -ENODEV;

	/* khubd will finish the reset later */
	ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
	return 0;
}

static void start_hnp(struct ohci_hcd *ohci);

#else

#define	ohci_start_port_reset		NULL

#endif

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


/* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
 * not necessarily continuous ... to guard against resume signaling.
 * The short timeout is safe for non-root hubs, and is backward-compatible
 * with earlier Linux hosts.
 */
#ifdef	CONFIG_USB_SUSPEND
#define	PORT_RESET_MSEC		50
#else
#define	PORT_RESET_MSEC		10
#endif

/* this timer value might be vendor-specific ... */
#define	PORT_RESET_HW_MSEC	10

/* wrap-aware logic morphed from <linux/jiffies.h> */
#define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)

/* called from some task, normally khubd */
static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
{
	__hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
	u32	temp;
	u16	now = ohci_readl(ohci, &ohci->regs->fmnumber);
	u16	reset_done = now + PORT_RESET_MSEC;

	/* build a "continuous enough" reset signal, with up to
	 * 3msec gap between pulses.  scheduler HZ==100 must work;
	 * this might need to be deadline-scheduled.
	 */
	do {
		/* spin until any current reset finishes */
		for (;;) {
			temp = ohci_readl (ohci, portstat);
			if (!(temp & RH_PS_PRS))
				break;
			udelay (500);
		} 

		if (!(temp & RH_PS_CCS))
			break;
		if (temp & RH_PS_PRSC)
			ohci_writel (ohci, RH_PS_PRSC, portstat);

		/* start the next reset, sleep till it's probably done */
		ohci_writel (ohci, RH_PS_PRS, portstat);
		msleep(PORT_RESET_HW_MSEC);
		now = ohci_readl(ohci, &ohci->regs->fmnumber);
	} while (tick_before(now, reset_done));
	/* caller synchronizes using PRSC */
}

static int ohci_hub_control (
	struct usb_hcd	*hcd,
	u16		typeReq,
	u16		wValue,
	u16		wIndex,
	char		*buf,
	u16		wLength
) {
	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
	int		ports = hcd_to_bus (hcd)->root_hub->maxchild;
	u32		temp;
	int		retval = 0;

	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
		return -ESHUTDOWN;

	switch (typeReq) {
	case ClearHubFeature:
		switch (wValue) {
		case C_HUB_OVER_CURRENT:
			ohci_writel (ohci, RH_HS_OCIC,
					&ohci->regs->roothub.status);
		case C_HUB_LOCAL_POWER:
			break;
		default:
			goto error;
		}
		break;
	case ClearPortFeature:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;

		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
			temp = RH_PS_CCS;
			break;
		case USB_PORT_FEAT_C_ENABLE:
			temp = RH_PS_PESC;
			break;
		case USB_PORT_FEAT_SUSPEND:
			temp = RH_PS_POCI;
			break;
		case USB_PORT_FEAT_C_SUSPEND:
			temp = RH_PS_PSSC;
			break;
		case USB_PORT_FEAT_POWER:
			temp = RH_PS_LSDA;
			break;
		case USB_PORT_FEAT_C_CONNECTION:
			temp = RH_PS_CSC;
			break;
		case USB_PORT_FEAT_C_OVER_CURRENT:
			temp = RH_PS_OCIC;
			break;
		case USB_PORT_FEAT_C_RESET:
			temp = RH_PS_PRSC;
			break;
		default:
			goto error;
		}
		ohci_writel (ohci, temp,
				&ohci->regs->roothub.portstatus [wIndex]);
		// ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
		break;
	case GetHubDescriptor:
		ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
		break;
	case GetHubStatus:
		temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
		put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
		break;
	case GetPortStatus:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		temp = roothub_portstatus (ohci, wIndex);
		put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);

#ifndef	OHCI_VERBOSE_DEBUG
	if (*(u16*)(buf+2))	/* only if wPortChange is interesting */
#endif
		dbg_port (ohci, "GetStatus", wIndex, temp);
		break;
	case SetHubFeature:
		switch (wValue) {
		case C_HUB_OVER_CURRENT:
			// FIXME:  this can be cleared, yes?
		case C_HUB_LOCAL_POWER:
			break;
		default:
			goto error;
		}
		break;
	case SetPortFeature:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		switch (wValue) {
		case USB_PORT_FEAT_SUSPEND:
#ifdef	CONFIG_USB_OTG
			if (hcd->self.otg_port == (wIndex + 1)
					&& hcd->self.b_hnp_enable)
				start_hnp(ohci);
			else
#endif
			ohci_writel (ohci, RH_PS_PSS,
				&ohci->regs->roothub.portstatus [wIndex]);
			break;
		case USB_PORT_FEAT_POWER:
			ohci_writel (ohci, RH_PS_PPS,
				&ohci->regs->roothub.portstatus [wIndex]);
			break;
		case USB_PORT_FEAT_RESET:
			root_port_reset (ohci, wIndex);
			break;
		default:
			goto error;
		}
		break;

	default:
error:
		/* "protocol stall" on error */
		retval = -EPIPE;
	}
	return retval;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* OHCI HCD (Host Controller Driver) for USB.
	3	*
	4	* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
	5	* (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
	6	*
	7	* This file is licenced under GPL
	8	*/
	9
	10	/-------------------------------------------------------------------------/
	11
	12	/*
	13	* OHCI Root Hub ... the nonsharable stuff
	14	*/
	15
	16	#define dbg_port(hc,label,num,value) \
	17	ohci_dbg (hc, \
	18	"%s roothub.portstatus [%d] " \
	19	"= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
	20	label, num, temp, \
	21	(temp & RH_PS_PRSC) ? " PRSC" : "", \
	22	(temp & RH_PS_OCIC) ? " OCIC" : "", \
	23	(temp & RH_PS_PSSC) ? " PSSC" : "", \
	24	(temp & RH_PS_PESC) ? " PESC" : "", \
	25	(temp & RH_PS_CSC) ? " CSC" : "", \
	26	\
	27	(temp & RH_PS_LSDA) ? " LSDA" : "", \
	28	(temp & RH_PS_PPS) ? " PPS" : "", \
	29	(temp & RH_PS_PRS) ? " PRS" : "", \
	30	(temp & RH_PS_POCI) ? " POCI" : "", \
	31	(temp & RH_PS_PSS) ? " PSS" : "", \
	32	\
	33	(temp & RH_PS_PES) ? " PES" : "", \
	34	(temp & RH_PS_CCS) ? " CCS" : "" \
	35	);
	36
	37	/-------------------------------------------------------------------------/
	38
d413984a DB	39	/* hcd->hub_irq_enable() */
	40	static void ohci_rhsc_enable (struct usb_hcd *hcd)
	41	{
	42	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
	43
052ac01a AS	44	spin_lock_irq(&ohci->lock);
	45	if (!ohci->autostop)
	46	del_timer(&hcd->rh_timer); /* Prevent next poll */
	47	ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
	48	spin_unlock_irq(&ohci->lock);
d413984a DB	49	}
d413984a DB	50
1da177e4 LT	51	#define OHCI_SCHED_ENABLES \
	52	(OHCI_CTRL_CLE\|OHCI_CTRL_BLE\|OHCI_CTRL_PLE\|OHCI_CTRL_IE)
	53
7d12e780 DH	54	static void dl_done_list (struct ohci_hcd *);
7d12e780 DH	55	static void finish_unlinks (struct ohci_hcd *, u16);
1da177e4	56
b1878440 AS	57	#ifdef CONFIG_PM
	58	static int ohci_restart(struct ohci_hcd *ohci);
	59	#endif
	60
8d1a243b AS	61	static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
	62	__releases(ohci->lock)
	63	__acquires(ohci->lock)
1da177e4	64	{
1da177e4	65	int status = 0;
8de98402	66
1da177e4 LT	67	ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
	68	switch (ohci->hc_control & OHCI_CTRL_HCFS) {
	69	case OHCI_USB_RESUME:
	70	ohci_dbg (ohci, "resume/suspend?\n");
	71	ohci->hc_control &= ~OHCI_CTRL_HCFS;
	72	ohci->hc_control \|= OHCI_USB_RESET;
	73	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
	74	(void) ohci_readl (ohci, &ohci->regs->control);
	75	/* FALL THROUGH */
	76	case OHCI_USB_RESET:
	77	status = -EBUSY;
	78	ohci_dbg (ohci, "needs reinit!\n");
	79	goto done;
	80	case OHCI_USB_SUSPEND:
8d1a243b AS	81	if (!ohci->autostop) {
	82	ohci_dbg (ohci, "already suspended\n");
	83	goto done;
	84	}
1da177e4	85	}
8d1a243b AS	86	ohci_dbg (ohci, "%s root hub\n",
8d1a243b AS	87	autostop ? "auto-stop" : "suspend");
1da177e4 LT	88
1da177e4 LT	89	/* First stop any processing */
8d1a243b	90	if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
1da177e4 LT	91	ohci->hc_control &= ~OHCI_SCHED_ENABLES;
	92	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
	93	ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
	94	ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
	95
	96	/* sched disables take effect on the next frame,
	97	* then the last WDH could take 6+ msec
	98	*/
	99	ohci_dbg (ohci, "stopping schedules ...\n");
8d1a243b AS	100	ohci->autostop = 0;
	101	spin_unlock_irq (&ohci->lock);
	102	msleep (8);
	103	spin_lock_irq (&ohci->lock);
1da177e4	104	}
7d12e780 DH	105	dl_done_list (ohci);
7d12e780 DH	106	finish_unlinks (ohci, ohci_frame_no(ohci));
1da177e4 LT	107
1da177e4 LT	108	/* maybe resume can wake root hub */
8d1a243b AS	109	if (device_may_wakeup(&ohci_to_hcd(ohci)->self.root_hub->dev) \|\|
8d1a243b AS	110	autostop)
1da177e4	111	ohci->hc_control \|= OHCI_CTRL_RWE;
1f7e1a3b AS	112	else {
1f7e1a3b AS	113	ohci_writel (ohci, OHCI_INTR_RHSC, &ohci->regs->intrdisable);
1da177e4	114	ohci->hc_control &= ~OHCI_CTRL_RWE;
1f7e1a3b	115	}
1da177e4	116
f197b2c5 DB	117	/* Suspend hub ... this is the "global (to this bus) suspend" mode,
	118	* which doesn't imply ports will first be individually suspended.
	119	*/
1da177e4 LT	120	ohci->hc_control &= ~OHCI_CTRL_HCFS;
	121	ohci->hc_control \|= OHCI_USB_SUSPEND;
	122	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
	123	(void) ohci_readl (ohci, &ohci->regs->control);
	124
	125	/* no resumes until devices finish suspending */
8d1a243b AS	126	if (!autostop) {
	127	ohci->next_statechange = jiffies + msecs_to_jiffies (5);
	128	ohci->autostop = 0;
	129	}
d413984a	130
1da177e4	131	done:
1da177e4 LT	132	return status;
	133	}
	134
	135	static inline struct ed find_head (struct ed ed)
	136	{
	137	/* for bulk and control lists */
	138	while (ed->ed_prev)
	139	ed = ed->ed_prev;
	140	return ed;
	141	}
	142
	143	/* caller has locked the root hub */
8d1a243b AS	144	static int ohci_rh_resume (struct ohci_hcd *ohci)
	145	__releases(ohci->lock)
	146	__acquires(ohci->lock)
1da177e4	147	{
8d1a243b	148	struct usb_hcd *hcd = ohci_to_hcd (ohci);
1da177e4 LT	149	u32 temp, enables;
1da177e4 LT	150	int status = -EINPROGRESS;
8d1a243b	151	int autostopped = ohci->autostop;
8de98402	152
8d1a243b	153	ohci->autostop = 0;
1da177e4 LT	154	ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
	155
	156	if (ohci->hc_control & (OHCI_CTRL_IR \| OHCI_SCHED_ENABLES)) {
f197b2c5	157	/* this can happen after resuming a swsusp snapshot */
1da177e4 LT	158	if (hcd->state == HC_STATE_RESUMING) {
	159	ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
	160	ohci->hc_control);
	161	status = -EBUSY;
	162	/* this happens when pmcore resumes HC then root */
	163	} else {
	164	ohci_dbg (ohci, "duplicate resume\n");
	165	status = 0;
	166	}
	167	} else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
	168	case OHCI_USB_SUSPEND:
	169	ohci->hc_control &= ~(OHCI_CTRL_HCFS\|OHCI_SCHED_ENABLES);
	170	ohci->hc_control \|= OHCI_USB_RESUME;
	171	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
	172	(void) ohci_readl (ohci, &ohci->regs->control);
8d1a243b AS	173	ohci_dbg (ohci, "%s root hub\n",
8d1a243b AS	174	autostopped ? "auto-start" : "resume");
1da177e4 LT	175	break;
	176	case OHCI_USB_RESUME:
	177	/* HCFS changes sometime after INTR_RD */
583ceada AS	178	ohci_info(ohci, "%swakeup\n",
583ceada AS	179	autostopped ? "auto-" : "");
1da177e4 LT	180	break;
1da177e4 LT	181	case OHCI_USB_OPER:
f197b2c5 DB	182	/* this can happen after resuming a swsusp snapshot */
	183	ohci_dbg (ohci, "snapshot resume? reinit\n");
	184	status = -EBUSY;
1da177e4 LT	185	break;
1da177e4 LT	186	default: /* RESET, we lost power */
f197b2c5	187	ohci_dbg (ohci, "lost power\n");
1da177e4 LT	188	status = -EBUSY;
1da177e4 LT	189	}
8d1a243b	190	#ifdef CONFIG_PM
1da177e4	191	if (status == -EBUSY) {
8d1a243b	192	if (!autostopped) {
8d1a243b AS	193	spin_unlock_irq (&ohci->lock);
	194	(void) ohci_init (ohci);
	195	status = ohci_restart (ohci);
	196	spin_lock_irq (&ohci->lock);
	197	}
	198	return status;
1da177e4	199	}
8d1a243b	200	#endif
1da177e4 LT	201	if (status != -EINPROGRESS)
1da177e4 LT	202	return status;
8d1a243b AS	203	if (autostopped)
	204	goto skip_resume;
	205	spin_unlock_irq (&ohci->lock);
1da177e4	206
1da177e4	207	/* Some controllers (lucent erratum) need extra-long delays */
f197b2c5	208	msleep (20 /* usb 11.5.1.10 / + 12 / 32 msec counter */ + 1);
1da177e4 LT	209
	210	temp = ohci_readl (ohci, &ohci->regs->control);
	211	temp &= OHCI_CTRL_HCFS;
	212	if (temp != OHCI_USB_RESUME) {
	213	ohci_err (ohci, "controller won't resume\n");
565402ba	214	spin_lock_irq(&ohci->lock);
1da177e4 LT	215	return -EBUSY;
	216	}
	217
	218	/* disable old schedule state, reinit from scratch */
	219	ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
	220	ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
	221	ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
	222	ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
	223	ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
	224	ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
	225
	226	/* Sometimes PCI D3 suspend trashes frame timings ... */
	227	periodic_reinit (ohci);
	228
8d1a243b AS	229	/* the following code is executed with ohci->lock held and
	230	* irqs disabled if and only if autostopped is true
	231	*/
	232
	233	skip_resume:
1da177e4 LT	234	/* interrupts might have been disabled */
	235	ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
	236	if (ohci->ed_rm_list)
	237	ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
1da177e4 LT	238
	239	/* Then re-enable operations */
	240	ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
	241	(void) ohci_readl (ohci, &ohci->regs->control);
8d1a243b AS	242	if (!autostopped)
8d1a243b AS	243	msleep (3);
1da177e4	244
6a9062f3 DB	245	temp = ohci->hc_control;
	246	temp &= OHCI_CTRL_RWC;
	247	temp \|= OHCI_CONTROL_INIT \| OHCI_USB_OPER;
1da177e4 LT	248	ohci->hc_control = temp;
	249	ohci_writel (ohci, temp, &ohci->regs->control);
	250	(void) ohci_readl (ohci, &ohci->regs->control);
	251
	252	/* TRSMRCY */
8d1a243b AS	253	if (!autostopped) {
	254	msleep (10);
	255	spin_lock_irq (&ohci->lock);
	256	}
	257	/* now ohci->lock is always held and irqs are always disabled */
1da177e4	258
d413984a DB	259	/* keep it alive for more than ~5x suspend + resume costs */
d413984a DB	260	ohci->next_statechange = jiffies + STATECHANGE_DELAY;
1da177e4 LT	261
	262	/* maybe turn schedules back on */
	263	enables = 0;
	264	temp = 0;
	265	if (!ohci->ed_rm_list) {
	266	if (ohci->ed_controltail) {
	267	ohci_writel (ohci,
	268	find_head (ohci->ed_controltail)->dma,
	269	&ohci->regs->ed_controlhead);
	270	enables \|= OHCI_CTRL_CLE;
	271	temp \|= OHCI_CLF;
	272	}
	273	if (ohci->ed_bulktail) {
	274	ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
	275	&ohci->regs->ed_bulkhead);
	276	enables \|= OHCI_CTRL_BLE;
	277	temp \|= OHCI_BLF;
	278	}
	279	}
	280	if (hcd->self.bandwidth_isoc_reqs \|\| hcd->self.bandwidth_int_reqs)
	281	enables \|= OHCI_CTRL_PLE\|OHCI_CTRL_IE;
	282	if (enables) {
	283	ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
	284	ohci->hc_control \|= enables;
	285	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
	286	if (temp)
	287	ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
	288	(void) ohci_readl (ohci, &ohci->regs->control);
	289	}
	290
1da177e4 LT	291	return 0;
	292	}
	293
8d1a243b AS	294	#ifdef CONFIG_PM
	295
	296	static int ohci_bus_suspend (struct usb_hcd *hcd)
	297	{
	298	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
	299	int rc;
	300
	301	spin_lock_irq (&ohci->lock);
	302
	303	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
	304	rc = -ESHUTDOWN;
	305	else
	306	rc = ohci_rh_suspend (ohci, 0);
	307	spin_unlock_irq (&ohci->lock);
	308	return rc;
	309	}
	310
	311	static int ohci_bus_resume (struct usb_hcd *hcd)
	312	{
	313	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
	314	int rc;
	315
	316	if (time_before (jiffies, ohci->next_statechange))
	317	msleep(5);
	318
	319	spin_lock_irq (&ohci->lock);
	320
	321	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
	322	rc = -ESHUTDOWN;
	323	else
	324	rc = ohci_rh_resume (ohci);
	325	spin_unlock_irq (&ohci->lock);
	326
	327	/* poll until we know a device is connected or we autostop */
	328	if (rc == 0)
	329	usb_hcd_poll_rh_status(hcd);
	330	return rc;
	331	}
	332
8ad7fe16	333	#endif /* CONFIG_PM */
1da177e4 LT	334
	335	/-------------------------------------------------------------------------/
	336
	337	/* build "status change" packet (one or two bytes) from HC registers */
	338
	339	static int
	340	ohci_hub_status_data (struct usb_hcd hcd, char buf)
	341	{
	342	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
fdd13b36	343	int i, changed = 0, length = 1;
052ac01a	344	int any_connected = 0;
1da177e4 LT	345	unsigned long flags;
	346
	347	spin_lock_irqsave (&ohci->lock, flags);
	348
fdd13b36 DB	349	/* undocumented erratum seen on at least rev D */
	350	if ((ohci->flags & OHCI_QUIRK_AMD756)
	351	&& (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
	352	ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
1da177e4 LT	353	ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
	354	/* retry later; "should not happen" */
	355	goto done;
	356	}
	357
	358	/* init status */
	359	if (roothub_status (ohci) & (RH_HS_LPSC \| RH_HS_OCIC))
	360	buf [0] = changed = 1;
	361	else
	362	buf [0] = 0;
fdd13b36	363	if (ohci->num_ports > 7) {
1da177e4 LT	364	buf [1] = 0;
	365	length++;
	366	}
	367
	368	/* look at each port */
fdd13b36	369	for (i = 0; i < ohci->num_ports; i++) {
1da177e4 LT	370	u32 status = roothub_portstatus (ohci, i);
1da177e4 LT	371
8d1a243b AS	372	/* can't autostop if ports are connected */
	373	any_connected \|= (status & RH_PS_CCS);
	374
1da177e4 LT	375	if (status & (RH_PS_CSC \| RH_PS_PESC \| RH_PS_PSSC
	376	\| RH_PS_OCIC \| RH_PS_PRSC)) {
	377	changed = 1;
	378	if (i < 7)
	379	buf [0] \|= 1 << (i + 1);
	380	else
	381	buf [1] \|= 1 << (i - 7);
1da177e4	382	}
d413984a	383	}
1da177e4	384
8d1a243b AS	385	hcd->poll_rh = 1;
	386
	387	/* carry out appropriate state changes */
	388	switch (ohci->hc_control & OHCI_CTRL_HCFS) {
	389
	390	case OHCI_USB_OPER:
	391	/* keep on polling until we know a device is connected
	392	* and RHSC is enabled */
	393	if (!ohci->autostop) {
	394	if (any_connected) {
052ac01a AS	395	if (ohci_readl(ohci, &ohci->regs->intrenable) &
052ac01a AS	396	OHCI_INTR_RHSC)
8d1a243b AS	397	hcd->poll_rh = 0;
	398	} else {
	399	ohci->autostop = 1;
	400	ohci->next_statechange = jiffies + HZ;
	401	}
	402
	403	/* if no devices have been attached for one second, autostop */
	404	} else {
	405	if (changed \|\| any_connected) {
	406	ohci->autostop = 0;
	407	ohci->next_statechange = jiffies +
	408	STATECHANGE_DELAY;
3da2495c AS	409	} else if (device_may_wakeup(&hcd->self.root_hub->dev)
3da2495c AS	410	&& time_after_eq(jiffies,
8d1a243b AS	411	ohci->next_statechange)
	412	&& !ohci->ed_rm_list
	413	&& !(ohci->hc_control &
	414	OHCI_SCHED_ENABLES)) {
	415	ohci_rh_suspend (ohci, 1);
	416	}
	417	}
	418	break;
	419
	420	/* if there is a port change, autostart or ask to be resumed */
	421	case OHCI_USB_SUSPEND:
	422	case OHCI_USB_RESUME:
	423	if (changed) {
	424	if (ohci->autostop)
	425	ohci_rh_resume (ohci);
	426	else
	427	usb_hcd_resume_root_hub (hcd);
	428	} else {
	429	/* everything is idle, no need for polling */
	430	hcd->poll_rh = 0;
	431	}
	432	break;
	433	}
d413984a	434
1da177e4 LT	435	done:
	436	spin_unlock_irqrestore (&ohci->lock, flags);
	437
1da177e4 LT	438	return changed ? length : 0;
	439	}
	440
	441	/-------------------------------------------------------------------------/
	442
	443	static void
	444	ohci_hub_descriptor (
	445	struct ohci_hcd *ohci,
	446	struct usb_hub_descriptor *desc
	447	) {
	448	u32 rh = roothub_a (ohci);
1da177e4 LT	449	u16 temp;
	450
	451	desc->bDescriptorType = 0x29;
	452	desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
	453	desc->bHubContrCurrent = 0;
	454
fdd13b36 DB	455	desc->bNbrPorts = ohci->num_ports;
fdd13b36 DB	456	temp = 1 + (ohci->num_ports / 8);
1da177e4 LT	457	desc->bDescLength = 7 + 2 * temp;
	458
	459	temp = 0;
	460	if (rh & RH_A_NPS) /* no power switching? */
	461	temp \|= 0x0002;
	462	if (rh & RH_A_PSM) /* per-port power switching? */
	463	temp \|= 0x0001;
	464	if (rh & RH_A_NOCP) /* no overcurrent reporting? */
	465	temp \|= 0x0010;
	466	else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
	467	temp \|= 0x0008;
	468	desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
	469
	470	/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
	471	rh = roothub_b (ohci);
b2134bcd	472	memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
1da177e4	473	desc->bitmap [0] = rh & RH_B_DR;
fdd13b36	474	if (ohci->num_ports > 7) {
1da177e4	475	desc->bitmap [1] = (rh & RH_B_DR) >> 8;
b2134bcd	476	desc->bitmap [2] = 0xff;
1da177e4 LT	477	} else
	478	desc->bitmap [1] = 0xff;
	479	}
	480
	481	/-------------------------------------------------------------------------/
	482
	483	#ifdef CONFIG_USB_OTG
	484
	485	static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
	486	{
	487	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
	488	u32 status;
	489
	490	if (!port)
	491	return -EINVAL;
	492	port--;
	493
	494	/* start port reset before HNP protocol times out */
	495	status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
	496	if (!(status & RH_PS_CCS))
	497	return -ENODEV;
	498
	499	/* khubd will finish the reset later */
	500	ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
	501	return 0;
	502	}
	503
	504	static void start_hnp(struct ohci_hcd *ohci);
	505
	506	#else
	507
	508	#define ohci_start_port_reset NULL
	509
	510	#endif
	511
	512	/-------------------------------------------------------------------------/
	513
	514
	515	/* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
	516	* not necessarily continuous ... to guard against resume signaling.
	517	* The short timeout is safe for non-root hubs, and is backward-compatible
	518	* with earlier Linux hosts.
	519	*/
	520	#ifdef CONFIG_USB_SUSPEND
	521	#define PORT_RESET_MSEC 50
	522	#else
	523	#define PORT_RESET_MSEC 10
	524	#endif
	525
	526	/* this timer value might be vendor-specific ... */
	527	#define PORT_RESET_HW_MSEC 10
	528
	529	/* wrap-aware logic morphed from <linux/jiffies.h> */
	530	#define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
	531
	532	/* called from some task, normally khubd */
	533	static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
	534	{
	535	__hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
	536	u32 temp;
	537	u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
	538	u16 reset_done = now + PORT_RESET_MSEC;
	539
	540	/* build a "continuous enough" reset signal, with up to
541	* 3msec gap between pulses. scheduler HZ==100 must work;
542	* this might need to be deadline-scheduled.
543	*/
544	do {
545	/* spin until any current reset finishes */
546	for (;;) {
547	temp = ohci_readl (ohci, portstat);
548	if (!(temp & RH_PS_PRS))
549	break;
550	udelay (500);
551	}
552
553	if (!(temp & RH_PS_CCS))
554	break;
555	if (temp & RH_PS_PRSC)
556	ohci_writel (ohci, RH_PS_PRSC, portstat);
557
558	/* start the next reset, sleep till it's probably done */
559	ohci_writel (ohci, RH_PS_PRS, portstat);
560	msleep(PORT_RESET_HW_MSEC);
561	now = ohci_readl(ohci, &ohci->regs->fmnumber);
562	} while (tick_before(now, reset_done));
563	/* caller synchronizes using PRSC */
564	}
565
566	static int ohci_hub_control (
567	struct usb_hcd *hcd,
568	u16 typeReq,
569	u16 wValue,
570	u16 wIndex,
571	char *buf,
572	u16 wLength
573	) {
574	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
575	int ports = hcd_to_bus (hcd)->root_hub->maxchild;
576	u32 temp;
577	int retval = 0;
578
8de98402 BH	579	if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
	580	return -ESHUTDOWN;
	581
1da177e4 LT	582	switch (typeReq) {
	583	case ClearHubFeature:
	584	switch (wValue) {
	585	case C_HUB_OVER_CURRENT:
	586	ohci_writel (ohci, RH_HS_OCIC,
	587	&ohci->regs->roothub.status);
	588	case C_HUB_LOCAL_POWER:
	589	break;
	590	default:
	591	goto error;
	592	}
	593	break;
	594	case ClearPortFeature:
	595	if (!wIndex \|\| wIndex > ports)
	596	goto error;
	597	wIndex--;
	598
	599	switch (wValue) {
	600	case USB_PORT_FEAT_ENABLE:
	601	temp = RH_PS_CCS;
	602	break;
	603	case USB_PORT_FEAT_C_ENABLE:
	604	temp = RH_PS_PESC;
	605	break;
	606	case USB_PORT_FEAT_SUSPEND:
	607	temp = RH_PS_POCI;
1da177e4 LT	608	break;
	609	case USB_PORT_FEAT_C_SUSPEND:
	610	temp = RH_PS_PSSC;
	611	break;
	612	case USB_PORT_FEAT_POWER:
	613	temp = RH_PS_LSDA;
	614	break;
	615	case USB_PORT_FEAT_C_CONNECTION:
	616	temp = RH_PS_CSC;
	617	break;
	618	case USB_PORT_FEAT_C_OVER_CURRENT:
	619	temp = RH_PS_OCIC;
	620	break;
	621	case USB_PORT_FEAT_C_RESET:
	622	temp = RH_PS_PRSC;
	623	break;
	624	default:
	625	goto error;
	626	}
	627	ohci_writel (ohci, temp,
	628	&ohci->regs->roothub.portstatus [wIndex]);
	629	// ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
	630	break;
	631	case GetHubDescriptor:
	632	ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
	633	break;
	634	case GetHubStatus:
	635	temp = roothub_status (ohci) & ~(RH_HS_CRWE \| RH_HS_DRWE);
92164c5d	636	put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
1da177e4 LT	637	break;
	638	case GetPortStatus:
	639	if (!wIndex \|\| wIndex > ports)
	640	goto error;
	641	wIndex--;
	642	temp = roothub_portstatus (ohci, wIndex);
92164c5d	643	put_unaligned(cpu_to_le32 (temp), (__le32 *) buf);
1da177e4 LT	644
	645	#ifndef OHCI_VERBOSE_DEBUG
	646	if ((u16)(buf+2)) /* only if wPortChange is interesting */
	647	#endif
	648	dbg_port (ohci, "GetStatus", wIndex, temp);
	649	break;
	650	case SetHubFeature:
	651	switch (wValue) {
	652	case C_HUB_OVER_CURRENT:
	653	// FIXME: this can be cleared, yes?
	654	case C_HUB_LOCAL_POWER:
	655	break;
	656	default:
	657	goto error;
	658	}
	659	break;
	660	case SetPortFeature:
	661	if (!wIndex \|\| wIndex > ports)
	662	goto error;
	663	wIndex--;
	664	switch (wValue) {
	665	case USB_PORT_FEAT_SUSPEND:
	666	#ifdef CONFIG_USB_OTG
	667	if (hcd->self.otg_port == (wIndex + 1)
	668	&& hcd->self.b_hnp_enable)
	669	start_hnp(ohci);
	670	else
	671	#endif
	672	ohci_writel (ohci, RH_PS_PSS,
	673	&ohci->regs->roothub.portstatus [wIndex]);
	674	break;
	675	case USB_PORT_FEAT_POWER:
	676	ohci_writel (ohci, RH_PS_PPS,
	677	&ohci->regs->roothub.portstatus [wIndex]);
	678	break;
	679	case USB_PORT_FEAT_RESET:
	680	root_port_reset (ohci, wIndex);
	681	break;
	682	default:
	683	goto error;
	684	}
	685	break;
	686
	687	default:
	688	error:
	689	/* "protocol stall" on error */
	690	retval = -EPIPE;
	691	}
	692	return retval;
	693	}
	694