ehci-hub.c

usb driver for 2.6.17

	memset (&desc->bitmap [0], 0, temp);
	memset (&desc->bitmap [temp], 0xff, temp);

	temp = 0x0008;			/* per-port overcurrent reporting */
	if (HCS_PPC (ehci->hcs_params))
		temp |= 0x0001;		/* per-port power control */
	else
		temp |= 0x0002;		/* no power switching */
#if 0
// re-enable when we support USB_PORT_FEAT_INDICATOR below.
	if (HCS_INDICATOR (ehci->hcs_params))
		temp |= 0x0080;		/* per-port indicators (LEDs) */
#endif
	desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
}

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

#define	PORT_WAKE_BITS 	(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)

static int ehci_hub_control (
	struct usb_hcd	*hcd,
	u16		typeReq,
	u16		wValue,
	u16		wIndex,
	char		*buf,
	u16		wLength
) {
	struct ehci_hcd	*ehci = hcd_to_ehci (hcd);
	int		ports = HCS_N_PORTS (ehci->hcs_params);
	u32		temp, status;
	unsigned long	flags;
	int		retval = 0;

	/*
	 * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
	 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
	 * (track current state ourselves) ... blink for diagnostics,
	 * power, "this is the one", etc.  EHCI spec supports this.
	 */

	spin_lock_irqsave (&ehci->lock, flags);
	switch (typeReq) {
	case ClearHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case ClearPortFeature:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		temp = readl (&ehci->regs->port_status [wIndex]);
		if (temp & PORT_OWNER)
			break;

		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
			writel (temp & ~PORT_PE,
				&ehci->regs->port_status [wIndex]);
			break;
		case USB_PORT_FEAT_C_ENABLE:
			writel((temp & ~PORT_RWC_BITS) | PORT_PEC,
				&ehci->regs->port_status [wIndex]);
			break;
		case USB_PORT_FEAT_SUSPEND:
			if (temp & PORT_RESET)
				goto error;
			if (ehci->no_selective_suspend)
				break;
			if (temp & PORT_SUSPEND) {
				if ((temp & PORT_PE) == 0)
					goto error;
				/* resume signaling for 20 msec */
				temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
				writel (temp | PORT_RESUME,
					&ehci->regs->port_status [wIndex]);
				ehci->reset_done [wIndex] = jiffies
						+ msecs_to_jiffies (20);
			}
			break;
		case USB_PORT_FEAT_C_SUSPEND:
			/* we auto-clear this feature */
			break;
		case USB_PORT_FEAT_POWER:
			if (HCS_PPC (ehci->hcs_params))
				writel (temp & ~(PORT_RWC_BITS | PORT_POWER),
					&ehci->regs->port_status [wIndex]);
			break;
		case USB_PORT_FEAT_C_CONNECTION:
			writel((temp & ~PORT_RWC_BITS) | PORT_CSC,
				&ehci->regs->port_status [wIndex]);
			break;
		case USB_PORT_FEAT_C_OVER_CURRENT:
			writel((temp & ~PORT_RWC_BITS) | PORT_OCC,
				&ehci->regs->port_status [wIndex]);
			break;
		case USB_PORT_FEAT_C_RESET:
			/* GetPortStatus clears reset */
			break;
		default:
			goto error;
		}
		readl (&ehci->regs->command);	/* unblock posted write */
		break;
	case GetHubDescriptor:
		ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
			buf);
		break;
	case GetHubStatus:
		/* no hub-wide feature/status flags */
		memset (buf, 0, 4);
		//cpu_to_le32s ((u32 *) buf);
		break;
	case GetPortStatus:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		status = 0;
		temp = readl (&ehci->regs->port_status [wIndex]);

		// wPortChange bits
		if (temp & PORT_CSC)
			status |= 1 << USB_PORT_FEAT_C_CONNECTION;
		if (temp & PORT_PEC)
			status |= 1 << USB_PORT_FEAT_C_ENABLE;
		if (temp & PORT_OCC)
			status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;

		/* whoever resumes must GetPortStatus to complete it!! */
		if ((temp & PORT_RESUME)
				&& time_after (jiffies,
					ehci->reset_done [wIndex])) {
			status |= 1 << USB_PORT_FEAT_C_SUSPEND;
			ehci->reset_done [wIndex] = 0;

			/* stop resume signaling */
			temp = readl (&ehci->regs->port_status [wIndex]);
			writel (temp & ~(PORT_RWC_BITS | PORT_RESUME),
				&ehci->regs->port_status [wIndex]);
			retval = handshake (
					&ehci->regs->port_status [wIndex],
					PORT_RESUME, 0, 2000 /* 2msec */);
			if (retval != 0) {
				ehci_err (ehci, "port %d resume error %d\n",
					wIndex + 1, retval);
				goto error;
			}
			temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
		}

		/* whoever resets must GetPortStatus to complete it!! */
		if ((temp & PORT_RESET)
				&& time_after (jiffies,
					ehci->reset_done [wIndex])) {
			status |= 1 << USB_PORT_FEAT_C_RESET;
			ehci->reset_done [wIndex] = 0;

			/* force reset to complete */
			writel (temp & ~(PORT_RWC_BITS | PORT_RESET),
					&ehci->regs->port_status [wIndex]);
			/* REVISIT:  some hardware needs 550+ usec to clear
			 * this bit; seems too long to spin routinely...
			 */
			retval = handshake (
					&ehci->regs->port_status [wIndex],
					PORT_RESET, 0, 750);
			if (retval != 0) {
				ehci_err (ehci, "port %d reset error %d\n",
					wIndex + 1, retval);
				goto error;
			}

			/* see what we found out */
			temp = check_reset_complete (ehci, wIndex,
				readl (&ehci->regs->port_status [wIndex]));
		}

		// don't show wPortStatus if it's owned by a companion hc
		if (!(temp & PORT_OWNER)) {
			if (temp & PORT_CONNECT) {
				status |= 1 << USB_PORT_FEAT_CONNECTION;
				// status may be from integrated TT
				status |= ehci_port_speed(ehci, temp);
			}
			if (temp & PORT_PE)
				status |= 1 << USB_PORT_FEAT_ENABLE;
			if (temp & (PORT_SUSPEND|PORT_RESUME))
				status |= 1 << USB_PORT_FEAT_SUSPEND;
			if (temp & PORT_OC)
				status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
			if (temp & PORT_RESET)
				status |= 1 << USB_PORT_FEAT_RESET;
			if (temp & PORT_POWER)
				status |= 1 << USB_PORT_FEAT_POWER;
		}

#ifndef	EHCI_VERBOSE_DEBUG
	if (status & ~0xffff)	/* only if wPortChange is interesting */
#endif
		dbg_port (ehci, "GetStatus", wIndex + 1, temp);
		// we "know" this alignment is good, caller used kmalloc()...
		*((__le32 *) buf) = cpu_to_le32 (status);
		break;
	case SetHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case SetPortFeature:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		temp = readl (&ehci->regs->port_status [wIndex]);
		if (temp & PORT_OWNER)
			break;

		temp &= ~PORT_RWC_BITS;
		switch (wValue) {
		case USB_PORT_FEAT_SUSPEND:
			if (ehci->no_selective_suspend)
				break;
			if ((temp & PORT_PE) == 0
					|| (temp & PORT_RESET) != 0)
				goto error;
			if (device_may_wakeup(&hcd->self.root_hub->dev))
				temp |= PORT_WAKE_BITS;
			writel (temp | PORT_SUSPEND,
				&ehci->regs->port_status [wIndex]);
			break;
		case USB_PORT_FEAT_POWER:
			if (HCS_PPC (ehci->hcs_params))
				writel (temp | PORT_POWER,
					&ehci->regs->port_status [wIndex]);
			break;
		case USB_PORT_FEAT_RESET:
			if (temp & PORT_RESUME)
				goto error;
			/* line status bits may report this as low speed,
			 * which can be fine if this root hub has a
			 * transaction translator built in.
			 */
			if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
					&& !ehci_is_TDI(ehci)
					&& PORT_USB11 (temp)) {
				ehci_dbg (ehci,
					"port %d low speed --> companion\n",
					wIndex + 1);
				temp |= PORT_OWNER;
			} else {
				ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
				temp |= PORT_RESET;
				temp &= ~PORT_PE;

				/*
				 * caller must wait, then call GetPortStatus
				 * usb 2.0 spec says 50 ms resets on root
				 */
				ehci->reset_done [wIndex] = jiffies
						+ msecs_to_jiffies (50);
			}
			writel (temp, &ehci->regs->port_status [wIndex]);
			break;
		default:
			goto error;
		}
		readl (&ehci->regs->command);	/* unblock posted writes */
		break;

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