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linux/drivers/usb/host/ehci-hub.c
Julius Werner 9b79091545 usb: ehci: Only sleep for post-resume handover if devices use persist 
The current EHCI code sleeps a flat 110ms in the resume path if there
was a USB 1.1 device connected to its companion controller during
suspend, waiting for the device to reappear and reset so that it can be
handed back to the companion. This is necessary if the device uses
persist, so that the companion controller can actually see it during its
own resume path.

However, if the device doesn't use persist, this is entirely
unnecessary. We might just as well ignore it and have the normal device
detection/reset/handoff code handle it asynchronously when it eventually
shows up. As USB 1.1 devices are almost exclusively HIDs these days (for
which persist has no value), this can allow distros to shave another
tenth of a second off their resume time.

In order to enable this optimization, the patch also adds a new
usb_for_each_dev() iterator that is exported by the USB core and wraps
bus_for_each_dev() with the logic to differentiate between struct
usb_device and struct usb_interface on the usb_bus_type bus.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-05-20 11:28:55 -07:00

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/*
* Copyright (C) 2001-2004 by David Brownell
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* this file is part of ehci-hcd.c */
/*-------------------------------------------------------------------------*/
/*
* EHCI Root Hub ... the nonsharable stuff
*
* Registers don't need cpu_to_le32, that happens transparently
*/
/*-------------------------------------------------------------------------*/
#include <linux/usb/otg.h>
#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
#ifdef CONFIG_PM
static int ehci_hub_control(
struct usb_hcd *hcd,
u16 typeReq,
u16 wValue,
u16 wIndex,
char *buf,
u16 wLength
);
static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
{
return !udev->maxchild && udev->persist_enabled &&
udev->bus->root_hub->speed < USB_SPEED_HIGH;
}
/* After a power loss, ports that were owned by the companion must be
* reset so that the companion can still own them.
*/
static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
{
u32 __iomem *reg;
u32 status;
int port;
__le32 buf;
struct usb_hcd *hcd = ehci_to_hcd(ehci);
if (!ehci->owned_ports)
return;
/*
* USB 1.1 devices are mostly HIDs, which don't need to persist across
* suspends. If we ensure that none of our companion's devices have
* persist_enabled (by looking through all USB 1.1 buses in the system),
* we can skip this and avoid slowing resume down. Devices without
* persist will just get reenumerated shortly after resume anyway.
*/
if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
return;
/* Make sure the ports are powered */
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
if (test_bit(port, &ehci->owned_ports)) {
reg = &ehci->regs->port_status[port];
status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
if (!(status & PORT_POWER)) {
status |= PORT_POWER;
ehci_writel(ehci, status, reg);
}
}
}
/* Give the connections some time to appear */
msleep(20);
spin_lock_irq(&ehci->lock);
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
if (test_bit(port, &ehci->owned_ports)) {
reg = &ehci->regs->port_status[port];
status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
/* Port already owned by companion? */
if (status & PORT_OWNER)
clear_bit(port, &ehci->owned_ports);
else if (test_bit(port, &ehci->companion_ports))
ehci_writel(ehci, status & ~PORT_PE, reg);
else {
spin_unlock_irq(&ehci->lock);
ehci_hub_control(hcd, SetPortFeature,
USB_PORT_FEAT_RESET, port + 1,
NULL, 0);
spin_lock_irq(&ehci->lock);
}
}
}
spin_unlock_irq(&ehci->lock);
if (!ehci->owned_ports)
return;
msleep(90); /* Wait for resets to complete */
spin_lock_irq(&ehci->lock);
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
if (test_bit(port, &ehci->owned_ports)) {
spin_unlock_irq(&ehci->lock);
ehci_hub_control(hcd, GetPortStatus,
0, port + 1,
(char *) &buf, sizeof(buf));
spin_lock_irq(&ehci->lock);
/* The companion should now own the port,
* but if something went wrong the port must not
* remain enabled.
*/
reg = &ehci->regs->port_status[port];
status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
if (status & PORT_OWNER)
ehci_writel(ehci, status | PORT_CSC, reg);
else {
ehci_dbg(ehci, "failed handover port %d: %x\n",
port + 1, status);
ehci_writel(ehci, status & ~PORT_PE, reg);
}
}
}
ehci->owned_ports = 0;
spin_unlock_irq(&ehci->lock);
}
static int ehci_port_change(struct ehci_hcd *ehci)
{
int i = HCS_N_PORTS(ehci->hcs_params);
/* First check if the controller indicates a change event */
if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
return 1;
/*
* Not all controllers appear to update this while going from D3 to D0,
* so check the individual port status registers as well
*/
while (i--)
if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
return 1;
return 0;
}
static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
bool suspending, bool do_wakeup)
{
int port;
u32 temp;
/* If remote wakeup is enabled for the root hub but disabled
* for the controller, we must adjust all the port wakeup flags
* when the controller is suspended or resumed. In all other
* cases they don't need to be changed.
*/
if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
return;
spin_lock_irq(&ehci->lock);
/* clear phy low-power mode before changing wakeup flags */
if (ehci->has_hostpc) {
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
temp = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
}
spin_unlock_irq(&ehci->lock);
msleep(5);
spin_lock_irq(&ehci->lock);
}
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *reg = &ehci->regs->port_status[port];
u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
u32 t2 = t1 & ~PORT_WAKE_BITS;
/* If we are suspending the controller, clear the flags.
* If we are resuming the controller, set the wakeup flags.
*/
if (!suspending) {
if (t1 & PORT_CONNECT)
t2 |= PORT_WKOC_E | PORT_WKDISC_E;
else
t2 |= PORT_WKOC_E | PORT_WKCONN_E;
}
ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
port + 1, t1, t2);
ehci_writel(ehci, t2, reg);
}
/* enter phy low-power mode again */
if (ehci->has_hostpc) {
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
temp = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
}
}
/* Does the root hub have a port wakeup pending? */
if (!suspending && ehci_port_change(ehci))
usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
spin_unlock_irq(&ehci->lock);
}
static int ehci_bus_suspend (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
int port;
int mask;
int changed;
ehci_dbg(ehci, "suspend root hub\n");
if (time_before (jiffies, ehci->next_statechange))
msleep(5);
/* stop the schedules */
ehci_quiesce(ehci);
spin_lock_irq (&ehci->lock);
if (ehci->rh_state < EHCI_RH_RUNNING)
goto done;
/* Once the controller is stopped, port resumes that are already
* in progress won't complete. Hence if remote wakeup is enabled
* for the root hub and any ports are in the middle of a resume or
* remote wakeup, we must fail the suspend.
*/
if (hcd->self.root_hub->do_remote_wakeup) {
if (ehci->resuming_ports) {
spin_unlock_irq(&ehci->lock);
ehci_dbg(ehci, "suspend failed because a port is resuming\n");
return -EBUSY;
}
}
/* Unlike other USB host controller types, EHCI doesn't have
* any notion of "global" or bus-wide suspend. The driver has
* to manually suspend all the active unsuspended ports, and
* then manually resume them in the bus_resume() routine.
*/
ehci->bus_suspended = 0;
ehci->owned_ports = 0;
changed = 0;
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *reg = &ehci->regs->port_status [port];
u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
u32 t2 = t1 & ~PORT_WAKE_BITS;
/* keep track of which ports we suspend */
if (t1 & PORT_OWNER)
set_bit(port, &ehci->owned_ports);
else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
t2 |= PORT_SUSPEND;
set_bit(port, &ehci->bus_suspended);
}
/* enable remote wakeup on all ports, if told to do so */
if (hcd->self.root_hub->do_remote_wakeup) {
/* only enable appropriate wake bits, otherwise the
* hardware can not go phy low power mode. If a race
* condition happens here(connection change during bits
* set), the port change detection will finally fix it.
*/
if (t1 & PORT_CONNECT)
t2 |= PORT_WKOC_E | PORT_WKDISC_E;
else
t2 |= PORT_WKOC_E | PORT_WKCONN_E;
}
if (t1 != t2) {
ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
port + 1, t1, t2);
ehci_writel(ehci, t2, reg);
changed = 1;
}
}
if (changed && ehci->has_hostpc) {
spin_unlock_irq(&ehci->lock);
msleep(5); /* 5 ms for HCD to enter low-power mode */
spin_lock_irq(&ehci->lock);
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
u32 t3;
t3 = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
t3 = ehci_readl(ehci, hostpc_reg);
ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
port, (t3 & HOSTPC_PHCD) ?
"succeeded" : "failed");
}
}
spin_unlock_irq(&ehci->lock);
/* Apparently some devices need a >= 1-uframe delay here */
if (ehci->bus_suspended)
udelay(150);
/* turn off now-idle HC */
ehci_halt (ehci);
spin_lock_irq(&ehci->lock);
if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
ehci_handle_controller_death(ehci);
if (ehci->rh_state != EHCI_RH_RUNNING)
goto done;
ehci->rh_state = EHCI_RH_SUSPENDED;
end_unlink_async(ehci);
unlink_empty_async_suspended(ehci);
ehci_handle_intr_unlinks(ehci);
end_free_itds(ehci);
/* allow remote wakeup */
mask = INTR_MASK;
if (!hcd->self.root_hub->do_remote_wakeup)
mask &= ~STS_PCD;
ehci_writel(ehci, mask, &ehci->regs->intr_enable);
ehci_readl(ehci, &ehci->regs->intr_enable);
done:
ehci->next_statechange = jiffies + msecs_to_jiffies(10);
ehci->enabled_hrtimer_events = 0;
ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
spin_unlock_irq (&ehci->lock);
hrtimer_cancel(&ehci->hrtimer);
return 0;
}
/* caller has locked the root hub, and should reset/reinit on error */
static int ehci_bus_resume (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 temp;
u32 power_okay;
int i;
unsigned long resume_needed = 0;
if (time_before (jiffies, ehci->next_statechange))
msleep(5);
spin_lock_irq (&ehci->lock);
if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
goto shutdown;
if (unlikely(ehci->debug)) {
if (!dbgp_reset_prep(hcd))
ehci->debug = NULL;
else
dbgp_external_startup(hcd);
}
/* Ideally and we've got a real resume here, and no port's power
* was lost. (For PCI, that means Vaux was maintained.) But we
* could instead be restoring a swsusp snapshot -- so that BIOS was
* the last user of the controller, not reset/pm hardware keeping
* state we gave to it.
*/
power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
ehci_dbg(ehci, "resume root hub%s\n",
power_okay ? "" : " after power loss");
/* at least some APM implementations will try to deliver
* IRQs right away, so delay them until we're ready.
*/
ehci_writel(ehci, 0, &ehci->regs->intr_enable);
/* re-init operational registers */
ehci_writel(ehci, 0, &ehci->regs->segment);
ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
/* restore CMD_RUN, framelist size, and irq threshold */
ehci->command |= CMD_RUN;
ehci_writel(ehci, ehci->command, &ehci->regs->command);
ehci->rh_state = EHCI_RH_RUNNING;
/*
* According to Bugzilla #8190, the port status for some controllers
* will be wrong without a delay. At their wrong status, the port
* is enabled, but not suspended neither resumed.
*/
i = HCS_N_PORTS(ehci->hcs_params);
while (i--) {
temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
if ((temp & PORT_PE) &&
!(temp & (PORT_SUSPEND | PORT_RESUME))) {
ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
spin_unlock_irq(&ehci->lock);
msleep(8);
spin_lock_irq(&ehci->lock);
break;
}
}
if (ehci->shutdown)
goto shutdown;
/* clear phy low-power mode before resume */
if (ehci->bus_suspended && ehci->has_hostpc) {
i = HCS_N_PORTS(ehci->hcs_params);
while (i--) {
if (test_bit(i, &ehci->bus_suspended)) {
u32 __iomem *hostpc_reg =
&ehci->regs->hostpc[i];
temp = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp & ~HOSTPC_PHCD,
hostpc_reg);
}
}
spin_unlock_irq(&ehci->lock);
msleep(5);
spin_lock_irq(&ehci->lock);
if (ehci->shutdown)
goto shutdown;
}
/* manually resume the ports we suspended during bus_suspend() */
i = HCS_N_PORTS (ehci->hcs_params);
while (i--) {
temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
if (test_bit(i, &ehci->bus_suspended) &&
(temp & PORT_SUSPEND)) {
temp |= PORT_RESUME;
set_bit(i, &resume_needed);
}
ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
}
/* msleep for 20ms only if code is trying to resume port */
if (resume_needed) {
spin_unlock_irq(&ehci->lock);
msleep(20);
spin_lock_irq(&ehci->lock);
if (ehci->shutdown)
goto shutdown;
}
i = HCS_N_PORTS (ehci->hcs_params);
while (i--) {
temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
if (test_bit(i, &resume_needed)) {
temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
ehci_vdbg (ehci, "resumed port %d\n", i + 1);
}
}
ehci->next_statechange = jiffies + msecs_to_jiffies(5);
spin_unlock_irq(&ehci->lock);
ehci_handover_companion_ports(ehci);
/* Now we can safely re-enable irqs */
spin_lock_irq(&ehci->lock);
if (ehci->shutdown)
goto shutdown;
ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
(void) ehci_readl(ehci, &ehci->regs->intr_enable);
spin_unlock_irq(&ehci->lock);
return 0;
shutdown:
spin_unlock_irq(&ehci->lock);
return -ESHUTDOWN;
}
#else
#define ehci_bus_suspend NULL
#define ehci_bus_resume NULL
#endif /* CONFIG_PM */
/*-------------------------------------------------------------------------*/
/*
* Sets the owner of a port
*/
static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
{
u32 __iomem *status_reg;
u32 port_status;
int try;
status_reg = &ehci->regs->port_status[portnum];
/*
* The controller won't set the OWNER bit if the port is
* enabled, so this loop will sometimes require at least two
* iterations: one to disable the port and one to set OWNER.
*/
for (try = 4; try > 0; --try) {
spin_lock_irq(&ehci->lock);
port_status = ehci_readl(ehci, status_reg);
if ((port_status & PORT_OWNER) == new_owner
|| (port_status & (PORT_OWNER | PORT_CONNECT))
== 0)
try = 0;
else {
port_status ^= PORT_OWNER;
port_status &= ~(PORT_PE | PORT_RWC_BITS);
ehci_writel(ehci, port_status, status_reg);
}
spin_unlock_irq(&ehci->lock);
if (try > 1)
msleep(5);
}
}
/*-------------------------------------------------------------------------*/
static int check_reset_complete (
struct ehci_hcd *ehci,
int index,
u32 __iomem *status_reg,
int port_status
) {
if (!(port_status & PORT_CONNECT))
return port_status;
/* if reset finished and it's still not enabled -- handoff */
if (!(port_status & PORT_PE)) {
/* with integrated TT, there's nobody to hand it to! */
if (ehci_is_TDI(ehci)) {
ehci_dbg (ehci,
"Failed to enable port %d on root hub TT\n",
index+1);
return port_status;
}
ehci_dbg (ehci, "port %d full speed --> companion\n",
index + 1);
// what happens if HCS_N_CC(params) == 0 ?
port_status |= PORT_OWNER;
port_status &= ~PORT_RWC_BITS;
ehci_writel(ehci, port_status, status_reg);
/* ensure 440EPX ohci controller state is operational */
if (ehci->has_amcc_usb23)
set_ohci_hcfs(ehci, 1);
} else {
ehci_dbg(ehci, "port %d reset complete, port enabled\n",
index + 1);
/* ensure 440EPx ohci controller state is suspended */
if (ehci->has_amcc_usb23)
set_ohci_hcfs(ehci, 0);
}
return port_status;
}
/*-------------------------------------------------------------------------*/
/* build "status change" packet (one or two bytes) from HC registers */
static int
ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 temp, status;
u32 mask;
int ports, i, retval = 1;
unsigned long flags;
u32 ppcd = ~0;
/* init status to no-changes */
buf [0] = 0;
ports = HCS_N_PORTS (ehci->hcs_params);
if (ports > 7) {
buf [1] = 0;
retval++;
}
/* Inform the core about resumes-in-progress by returning
* a non-zero value even if there are no status changes.
*/
status = ehci->resuming_ports;
/* Some boards (mostly VIA?) report bogus overcurrent indications,
* causing massive log spam unless we completely ignore them. It
* may be relevant that VIA VT8235 controllers, where PORT_POWER is
* always set, seem to clear PORT_OCC and PORT_CSC when writing to
* PORT_POWER; that's surprising, but maybe within-spec.
*/
if (!ignore_oc)
mask = PORT_CSC | PORT_PEC | PORT_OCC;
else
mask = PORT_CSC | PORT_PEC;
// PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
/* no hub change reports (bit 0) for now (power, ...) */
/* port N changes (bit N)? */
spin_lock_irqsave (&ehci->lock, flags);
/* get per-port change detect bits */
if (ehci->has_ppcd)
ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
for (i = 0; i < ports; i++) {
/* leverage per-port change bits feature */
if (ppcd & (1 << i))
temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
else
temp = 0;
/*
* Return status information even for ports with OWNER set.
* Otherwise khubd wouldn't see the disconnect event when a
* high-speed device is switched over to the companion
* controller by the user.
*/
if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
|| (ehci->reset_done[i] && time_after_eq(
jiffies, ehci->reset_done[i]))) {
if (i < 7)
buf [0] |= 1 << (i + 1);
else
buf [1] |= 1 << (i - 7);
status = STS_PCD;
}
}
/* If a resume is in progress, make sure it can finish */
if (ehci->resuming_ports)
mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
spin_unlock_irqrestore (&ehci->lock, flags);
return status ? retval : 0;
}
/*-------------------------------------------------------------------------*/
static void
ehci_hub_descriptor (
struct ehci_hcd *ehci,
struct usb_hub_descriptor *desc
) {
int ports = HCS_N_PORTS (ehci->hcs_params);
u16 temp;
desc->bDescriptorType = 0x29;
desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
desc->bHubContrCurrent = 0;
desc->bNbrPorts = ports;
temp = 1 + (ports / 8);
desc->bDescLength = 7 + 2 * temp;
/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
memset(&desc->u.hs.DeviceRemovable[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 = cpu_to_le16(temp);
}
/*-------------------------------------------------------------------------*/
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 __iomem *status_reg = &ehci->regs->port_status[
(wIndex & 0xff) - 1];
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[(wIndex & 0xff) - 1];
u32 temp, temp1, status;
unsigned long flags;
int retval = 0;
unsigned selector;
/*
* 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 = ehci_readl(ehci, status_reg);
temp &= ~PORT_RWC_BITS;
/*
* Even if OWNER is set, so the port is owned by the
* companion controller, khubd needs to be able to clear
* the port-change status bits (especially
* USB_PORT_STAT_C_CONNECTION).
*/
switch (wValue) {
case USB_PORT_FEAT_ENABLE:
ehci_writel(ehci, temp & ~PORT_PE, status_reg);
break;
case USB_PORT_FEAT_C_ENABLE:
ehci_writel(ehci, temp | PORT_PEC, status_reg);
break;
case USB_PORT_FEAT_SUSPEND:
if (temp & PORT_RESET)
goto error;
if (ehci->no_selective_suspend)
break;
#ifdef CONFIG_USB_OTG
if ((hcd->self.otg_port == (wIndex + 1))
&& hcd->self.b_hnp_enable) {
otg_start_hnp(hcd->phy->otg);
break;
}
#endif
if (!(temp & PORT_SUSPEND))
break;
if ((temp & PORT_PE) == 0)
goto error;
/* clear phy low-power mode before resume */
if (ehci->has_hostpc) {
temp1 = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
hostpc_reg);
spin_unlock_irqrestore(&ehci->lock, flags);
msleep(5);/* wait to leave low-power mode */
spin_lock_irqsave(&ehci->lock, flags);
}
/* resume signaling for 20 msec */
temp &= ~PORT_WAKE_BITS;
ehci_writel(ehci, temp | PORT_RESUME, status_reg);
ehci->reset_done[wIndex] = jiffies
+ msecs_to_jiffies(20);
break;
case USB_PORT_FEAT_C_SUSPEND:
clear_bit(wIndex, &ehci->port_c_suspend);
break;
case USB_PORT_FEAT_POWER:
if (HCS_PPC (ehci->hcs_params))
ehci_writel(ehci, temp & ~PORT_POWER,
status_reg);
break;
case USB_PORT_FEAT_C_CONNECTION:
ehci_writel(ehci, temp | PORT_CSC, status_reg);
break;
case USB_PORT_FEAT_C_OVER_CURRENT:
ehci_writel(ehci, temp | PORT_OCC, status_reg);
break;
case USB_PORT_FEAT_C_RESET:
/* GetPortStatus clears reset */
break;
default:
goto error;
}
ehci_readl(ehci, &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 = ehci_readl(ehci, status_reg);
// wPortChange bits
if (temp & PORT_CSC)
status |= USB_PORT_STAT_C_CONNECTION << 16;
if (temp & PORT_PEC)
status |= USB_PORT_STAT_C_ENABLE << 16;
if ((temp & PORT_OCC) && !ignore_oc){
status |= USB_PORT_STAT_C_OVERCURRENT << 16;
/*
* Hubs should disable port power on over-current.
* However, not all EHCI implementations do this
* automatically, even if they _do_ support per-port
* power switching; they're allowed to just limit the
* current. khubd will turn the power back on.
*/
if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
&& HCS_PPC(ehci->hcs_params)) {
ehci_writel(ehci,
temp & ~(PORT_RWC_BITS | PORT_POWER),
status_reg);
temp = ehci_readl(ehci, status_reg);
}
}
/* whoever resumes must GetPortStatus to complete it!! */
if (temp & PORT_RESUME) {
/* Remote Wakeup received? */
if (!ehci->reset_done[wIndex]) {
/* resume signaling for 20 msec */
ehci->reset_done[wIndex] = jiffies
+ msecs_to_jiffies(20);
usb_hcd_start_port_resume(&hcd->self, wIndex);
/* check the port again */
mod_timer(&ehci_to_hcd(ehci)->rh_timer,
ehci->reset_done[wIndex]);
}
/* resume completed? */
else if (time_after_eq(jiffies,
ehci->reset_done[wIndex])) {
clear_bit(wIndex, &ehci->suspended_ports);
set_bit(wIndex, &ehci->port_c_suspend);
ehci->reset_done[wIndex] = 0;
usb_hcd_end_port_resume(&hcd->self, wIndex);
/* stop resume signaling */
temp &= ~(PORT_RWC_BITS |
PORT_SUSPEND | PORT_RESUME);
ehci_writel(ehci, temp, status_reg);
clear_bit(wIndex, &ehci->resuming_ports);
retval = handshake(ehci, status_reg,
PORT_RESUME, 0, 2000 /* 2msec */);
if (retval != 0) {
ehci_err(ehci,
"port %d resume error %d\n",
wIndex + 1, retval);
goto error;
}
temp = ehci_readl(ehci, status_reg);
}
}
/* whoever resets must GetPortStatus to complete it!! */
if ((temp & PORT_RESET)
&& time_after_eq(jiffies,
ehci->reset_done[wIndex])) {
status |= USB_PORT_STAT_C_RESET << 16;
ehci->reset_done [wIndex] = 0;
clear_bit(wIndex, &ehci->resuming_ports);
/* force reset to complete */
ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
status_reg);
/* REVISIT: some hardware needs 550+ usec to clear
* this bit; seems too long to spin routinely...
*/
retval = handshake(ehci, status_reg,
PORT_RESET, 0, 1000);
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, status_reg,
ehci_readl(ehci, status_reg));
}
if (!(temp & (PORT_RESUME|PORT_RESET))) {
ehci->reset_done[wIndex] = 0;
clear_bit(wIndex, &ehci->resuming_ports);
}
/* transfer dedicated ports to the companion hc */
if ((temp & PORT_CONNECT) &&
test_bit(wIndex, &ehci->companion_ports)) {
temp &= ~PORT_RWC_BITS;
temp |= PORT_OWNER;
ehci_writel(ehci, temp, status_reg);
ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
temp = ehci_readl(ehci, status_reg);
}
/*
* Even if OWNER is set, there's no harm letting khubd
* see the wPortStatus values (they should all be 0 except
* for PORT_POWER anyway).
*/
if (temp & PORT_CONNECT) {
status |= USB_PORT_STAT_CONNECTION;
// status may be from integrated TT
if (ehci->has_hostpc) {
temp1 = ehci_readl(ehci, hostpc_reg);
status |= ehci_port_speed(ehci, temp1);
} else
status |= ehci_port_speed(ehci, temp);
}
if (temp & PORT_PE)
status |= USB_PORT_STAT_ENABLE;
/* maybe the port was unsuspended without our knowledge */
if (temp & (PORT_SUSPEND|PORT_RESUME)) {
status |= USB_PORT_STAT_SUSPEND;
} else if (test_bit(wIndex, &ehci->suspended_ports)) {
clear_bit(wIndex, &ehci->suspended_ports);
clear_bit(wIndex, &ehci->resuming_ports);
ehci->reset_done[wIndex] = 0;
if (temp & PORT_PE)
set_bit(wIndex, &ehci->port_c_suspend);
usb_hcd_end_port_resume(&hcd->self, wIndex);
}
if (temp & PORT_OC)
status |= USB_PORT_STAT_OVERCURRENT;
if (temp & PORT_RESET)
status |= USB_PORT_STAT_RESET;
if (temp & PORT_POWER)
status |= USB_PORT_STAT_POWER;
if (test_bit(wIndex, &ehci->port_c_suspend))
status |= USB_PORT_STAT_C_SUSPEND << 16;
#ifndef VERBOSE_DEBUG
if (status & ~0xffff) /* only if wPortChange is interesting */
#endif
dbg_port (ehci, "GetStatus", wIndex + 1, temp);
put_unaligned_le32(status, buf);
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:
selector = wIndex >> 8;
wIndex &= 0xff;
if (unlikely(ehci->debug)) {
/* If the debug port is active any port
* feature requests should get denied */
if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
(readl(&ehci->debug->control) & DBGP_ENABLED)) {
retval = -ENODEV;
goto error_exit;
}
}
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
temp = ehci_readl(ehci, status_reg);
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;
/* After above check the port must be connected.
* Set appropriate bit thus could put phy into low power
* mode if we have hostpc feature
*/
temp &= ~PORT_WKCONN_E;
temp |= PORT_WKDISC_E | PORT_WKOC_E;
ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
if (ehci->has_hostpc) {
spin_unlock_irqrestore(&ehci->lock, flags);
msleep(5);/* 5ms for HCD enter low pwr mode */
spin_lock_irqsave(&ehci->lock, flags);
temp1 = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp1 | HOSTPC_PHCD,
hostpc_reg);
temp1 = ehci_readl(ehci, hostpc_reg);
ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
wIndex, (temp1 & HOSTPC_PHCD) ?
"succeeded" : "failed");
}
set_bit(wIndex, &ehci->suspended_ports);
break;
case USB_PORT_FEAT_POWER:
if (HCS_PPC (ehci->hcs_params))
ehci_writel(ehci, temp | PORT_POWER,
status_reg);
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);
}
ehci_writel(ehci, temp, status_reg);
break;
/* For downstream facing ports (these): one hub port is put
* into test mode according to USB2 11.24.2.13, then the hub
* must be reset (which for root hub now means rmmod+modprobe,
* or else system reboot). See EHCI 2.3.9 and 4.14 for info
* about the EHCI-specific stuff.
*/
case USB_PORT_FEAT_TEST:
if (!selector || selector > 5)
goto error;
spin_unlock_irqrestore(&ehci->lock, flags);
ehci_quiesce(ehci);
spin_lock_irqsave(&ehci->lock, flags);
/* Put all enabled ports into suspend */
while (ports--) {
u32 __iomem *sreg =
&ehci->regs->port_status[ports];
temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
if (temp & PORT_PE)
ehci_writel(ehci, temp | PORT_SUSPEND,
sreg);
}
spin_unlock_irqrestore(&ehci->lock, flags);
ehci_halt(ehci);
spin_lock_irqsave(&ehci->lock, flags);
temp = ehci_readl(ehci, status_reg);
temp |= selector << 16;
ehci_writel(ehci, temp, status_reg);
break;
default:
goto error;
}
ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
break;
default:
error:
/* "stall" on error */
retval = -EPIPE;
}
error_exit:
spin_unlock_irqrestore (&ehci->lock, flags);
return retval;
}
static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
if (ehci_is_TDI(ehci))
return;
set_owner(ehci, --portnum, PORT_OWNER);
}
static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
u32 __iomem *reg;
if (ehci_is_TDI(ehci))
return 0;
reg = &ehci->regs->port_status[portnum - 1];
return ehci_readl(ehci, reg) & PORT_OWNER;
}
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