ACPI_STATUS
AcpiExSystemDoStall (
UINT32 HowLong)
{
ACPI_STATUS Status = AE_OK;
ACPI_FUNCTION_ENTRY ();
if (HowLong > 255) /* 255 microseconds */
{
/*
* Longer than 255 usec, this is an error
*
* (ACPI specifies 100 usec as max, but this gives some slack in
* order to support existing BIOSs)
*/
ACPI_ERROR ((AE_INFO,
"Time parameter is too large (%u)", HowLong));
Status = AE_AML_OPERAND_VALUE;
}
else
{
AcpiOsStall (HowLong);
}
return (Status);
}
ACPI_STATUS
AcpiEnterSleepStateS4bios (
void)
{
UINT32 InValue;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (AcpiEnterSleepStateS4bios);
/* Clear the wake status bit (PM1) */
Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Status = AcpiHwClearAcpiStatus ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/*
* 1) Disable/Clear all GPEs
* 2) Enable all wakeup GPEs
*/
Status = AcpiHwDisableAllGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
AcpiGbl_SystemAwakeAndRunning = FALSE;
Status = AcpiHwEnableAllWakeupGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
ACPI_FLUSH_CPU_CACHE ();
Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
(UINT32) AcpiGbl_FADT.S4BiosRequest, 8);
do {
AcpiOsStall (ACPI_USEC_PER_MSEC);
Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
} while (!InValue);
return_ACPI_STATUS (AE_OK);
}
static ACPI_STATUS
EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event)
{
EC_STATUS EcStatus;
UINT32 i = 0;
if (!EcIsLocked(sc))
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"EcWaitEvent called without EC lock!\n");
/*
* Stall 1us:
* ----------
* Stall for 1 microsecond before reading the status register
* for the first time. This allows the EC to set the IBF/OBF
* bit to its proper state.
*
* XXX it is not clear why we read the CSR twice.
*/
AcpiOsStall(1);
EcStatus = EC_GET_CSR(sc);
/*
* Wait For Event:
* ---------------
* Poll the EC status register to detect completion of the last
* command. Wait up to 10ms (in 10us chunks) for this to occur.
*/
for (i = 0; i < 1000; i++) {
EcStatus = EC_GET_CSR(sc);
if ((Event == EC_EVENT_OUTPUT_BUFFER_FULL) &&
(EcStatus & EC_FLAG_OUTPUT_BUFFER))
return(AE_OK);
if ((Event == EC_EVENT_INPUT_BUFFER_EMPTY) &&
!(EcStatus & EC_FLAG_INPUT_BUFFER))
return(AE_OK);
AcpiOsStall(10);
}
return(AE_ERROR);
}
static ACPI_STATUS
enter_s4_with_bios(void)
{
ACPI_OBJECT_LIST ArgList;
ACPI_OBJECT Arg;
u_long ef;
UINT32 ret;
ACPI_STATUS status;
/* run the _PTS and _GTS methods */
ACPI_MEMSET(&ArgList, 0, sizeof(ArgList));
ArgList.Count = 1;
ArgList.Pointer = &Arg;
ACPI_MEMSET(&Arg, 0, sizeof(Arg));
Arg.Type = ACPI_TYPE_INTEGER;
Arg.Integer.Value = ACPI_STATE_S4;
AcpiEvaluateObject(NULL, "\\_PTS", &ArgList, NULL);
AcpiEvaluateObject(NULL, "\\_GTS", &ArgList, NULL);
/* clear wake status */
AcpiSetRegister(ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_LOCK);
ef = read_eflags();
disable_intr();
AcpiHwDisableNonWakeupGpes();
/* flush caches */
ACPI_FLUSH_CPU_CACHE();
/*
* write the value to command port and wait until we enter sleep state
*/
do {
AcpiOsStall(1000000);
AcpiOsWritePort(AcpiGbl_FADT->SmiCmd,
AcpiGbl_FADT->S4BiosReq, 8);
status = AcpiGetRegister(ACPI_BITREG_WAKE_STATUS,
&ret, ACPI_MTX_LOCK);
if (ACPI_FAILURE(status))
break;
} while (!ret);
AcpiHwEnableNonWakeupGpes();
write_eflags(ef);
return (AE_OK);
}
ACPI_STATUS
AcpiHwLegacySleep (
UINT8 SleepState)
{
ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo;
ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo;
UINT32 Pm1aControl;
UINT32 Pm1bControl;
UINT32 InValue;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (HwLegacySleep);
SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE);
SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE);
/* Clear wake status */
Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Clear all fixed and general purpose status bits */
Status = AcpiHwClearAcpiStatus ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/*
* 1) Disable/Clear all GPEs
* 2) Enable all wakeup GPEs
*/
Status = AcpiHwDisableAllGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
AcpiGbl_SystemAwakeAndRunning = FALSE;
Status = AcpiHwEnableAllWakeupGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Get current value of PM1A control */
Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL,
&Pm1aControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
"Entering sleep state [S%u]\n", SleepState));
/* Clear the SLP_EN and SLP_TYP fields */
Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask |
SleepEnableRegInfo->AccessBitMask);
Pm1bControl = Pm1aControl;
/* Insert the SLP_TYP bits */
Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition);
Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition);
/*
* We split the writes of SLP_TYP and SLP_EN to workaround
* poorly implemented hardware.
*/
/* Write #1: write the SLP_TYP data to the PM1 Control registers */
Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Insert the sleep enable (SLP_EN) bit */
Pm1aControl |= SleepEnableRegInfo->AccessBitMask;
Pm1bControl |= SleepEnableRegInfo->AccessBitMask;
/* Flush caches, as per ACPI specification */
ACPI_FLUSH_CPU_CACHE ();
/* Write #2: Write both SLP_TYP + SLP_EN */
Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (SleepState > ACPI_STATE_S3)
{
/*
* We wanted to sleep > S3, but it didn't happen (by virtue of the
* fact that we are still executing!)
*
* Wait ten seconds, then try again. This is to get S4/S5 to work on
* all machines.
*
* We wait so long to allow chipsets that poll this reg very slowly
* to still read the right value. Ideally, this block would go
* away entirely.
*/
AcpiOsStall (10 * ACPI_USEC_PER_SEC);
Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_CONTROL,
SleepEnableRegInfo->AccessBitMask);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* Wait for transition back to Working State */
do
{
Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
} while (!InValue);
return_ACPI_STATUS (AE_OK);
}
ACPI_STATUS
AcpiHwSetMode (
UINT32 Mode)
{
ACPI_STATUS Status;
UINT32 Retry;
ACPI_FUNCTION_TRACE (HwSetMode);
/* If the Hardware Reduced flag is set, machine is always in acpi mode */
if (AcpiGbl_ReducedHardware)
{
return_ACPI_STATUS (AE_OK);
}
/*
* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
* system does not support mode transition.
*/
if (!AcpiGbl_FADT.SmiCommand)
{
ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed"));
return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
}
/*
* ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
* in FADT: If it is zero, enabling or disabling is not supported.
* As old systems may have used zero for mode transition,
* we make sure both the numbers are zero to determine these
* transitions are not supported.
*/
if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable)
{
ACPI_ERROR ((AE_INFO,
"No ACPI mode transition supported in this system "
"(enable/disable both zero)"));
return_ACPI_STATUS (AE_OK);
}
switch (Mode)
{
case ACPI_SYS_MODE_ACPI:
/* BIOS should have disabled ALL fixed and GP events */
Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
(UINT32) AcpiGbl_FADT.AcpiEnable, 8);
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
break;
case ACPI_SYS_MODE_LEGACY:
/*
* BIOS should clear all fixed status bits and restore fixed event
* enable bits to default
*/
Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
(UINT32) AcpiGbl_FADT.AcpiDisable, 8);
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Attempting to enable Legacy (non-ACPI) mode\n"));
break;
default:
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Could not write ACPI mode change"));
return_ACPI_STATUS (Status);
}
/*
* Some hardware takes a LONG time to switch modes. Give them 3 sec to
* do so, but allow faster systems to proceed more quickly.
*/
Retry = 3000;
while (Retry)
{
if (AcpiHwGetMode () == Mode)
{
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Mode %X successfully enabled\n", Mode));
return_ACPI_STATUS (AE_OK);
}
AcpiOsStall (ACPI_USEC_PER_MSEC);
Retry--;
}
ACPI_ERROR ((AE_INFO, "Hardware did not change modes"));
return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
}
ACPI_STATUS
AcpiEnterSleepState (
UINT8 SleepState)
{
UINT32 Pm1aControl;
UINT32 Pm1bControl;
ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo;
ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo;
UINT32 InValue;
ACPI_OBJECT_LIST ArgList;
ACPI_OBJECT Arg;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (AcpiEnterSleepState);
if ((AcpiGbl_SleepTypeA > ACPI_SLEEP_TYPE_MAX) ||
(AcpiGbl_SleepTypeB > ACPI_SLEEP_TYPE_MAX))
{
ACPI_ERROR ((AE_INFO, "Sleep values out of range: A=%X B=%X",
AcpiGbl_SleepTypeA, AcpiGbl_SleepTypeB));
return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
}
SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE);
SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE);
/* Clear wake status */
Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Clear all fixed and general purpose status bits */
Status = AcpiHwClearAcpiStatus ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (SleepState != ACPI_STATE_S5)
{
/*
* Disable BM arbitration. This feature is contained within an
* optional register (PM2 Control), so ignore a BAD_ADDRESS
* exception.
*/
Status = AcpiWriteBitRegister (ACPI_BITREG_ARB_DISABLE, 1);
if (ACPI_FAILURE (Status) && (Status != AE_BAD_ADDRESS))
{
return_ACPI_STATUS (Status);
}
}
/*
* 1) Disable/Clear all GPEs
* 2) Enable all wakeup GPEs
*/
Status = AcpiHwDisableAllGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
AcpiGbl_SystemAwakeAndRunning = FALSE;
Status = AcpiHwEnableAllWakeupGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Execute the _GTS method (Going To Sleep) */
ArgList.Count = 1;
ArgList.Pointer = &Arg;
Arg.Type = ACPI_TYPE_INTEGER;
Arg.Integer.Value = SleepState;
Status = AcpiEvaluateObject (NULL, METHOD_NAME__GTS, &ArgList, NULL);
if (ACPI_FAILURE (Status) && Status != AE_NOT_FOUND)
{
return_ACPI_STATUS (Status);
}
/* Get current value of PM1A control */
Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL,
&Pm1aControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
"Entering sleep state [S%d]\n", SleepState));
/* Clear the SLP_EN and SLP_TYP fields */
Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask |
SleepEnableRegInfo->AccessBitMask);
Pm1bControl = Pm1aControl;
/* Insert the SLP_TYP bits */
Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition);
Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition);
/*
* We split the writes of SLP_TYP and SLP_EN to workaround
* poorly implemented hardware.
*/
/* Write #1: write the SLP_TYP data to the PM1 Control registers */
Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Insert the sleep enable (SLP_EN) bit */
Pm1aControl |= SleepEnableRegInfo->AccessBitMask;
Pm1bControl |= SleepEnableRegInfo->AccessBitMask;
/* Flush caches, as per ACPI specification */
ACPI_FLUSH_CPU_CACHE ();
/* Write #2: Write both SLP_TYP + SLP_EN */
Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (SleepState > ACPI_STATE_S3)
{
/*
* We wanted to sleep > S3, but it didn't happen (by virtue of the
* fact that we are still executing!)
*
* Wait ten seconds, then try again. This is to get S4/S5 to work on
* all machines.
*
* We wait so long to allow chipsets that poll this reg very slowly
* to still read the right value. Ideally, this block would go
* away entirely.
*/
AcpiOsStall (10000000);
Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_CONTROL,
SleepEnableRegInfo->AccessBitMask);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* Wait until we enter sleep state */
do
{
Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Spin until we wake */
} while (!InValue);
return_ACPI_STATUS (AE_OK);
}
ACPI_STATUS
AcpiHwLegacySleep (
UINT8 SleepState,
UINT8 Flags)
{
ACPI_BIT_REGISTER_INFO *SleepTypeRegInfo;
ACPI_BIT_REGISTER_INFO *SleepEnableRegInfo;
UINT32 Pm1aControl;
UINT32 Pm1bControl;
UINT32 InValue;
UINT32 Retry;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (HwLegacySleep);
SleepTypeRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_TYPE);
SleepEnableRegInfo = AcpiHwGetBitRegisterInfo (ACPI_BITREG_SLEEP_ENABLE);
/* Clear wake status */
Status = AcpiWriteBitRegister (ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Clear all fixed and general purpose status bits */
Status = AcpiHwClearAcpiStatus ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (SleepState != ACPI_STATE_S5)
{
/*
* Disable BM arbitration. This feature is contained within an
* optional register (PM2 Control), so ignore a BAD_ADDRESS
* exception.
*/
Status = AcpiWriteBitRegister (ACPI_BITREG_ARB_DISABLE, 1);
if (ACPI_FAILURE (Status) && (Status != AE_BAD_ADDRESS))
{
return_ACPI_STATUS (Status);
}
}
/*
* 1) Disable/Clear all GPEs
* 2) Enable all wakeup GPEs
*/
Status = AcpiHwDisableAllGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
AcpiGbl_SystemAwakeAndRunning = FALSE;
Status = AcpiHwEnableAllWakeupGpes ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Optionally execute _GTS (Going To Sleep) */
if (Flags & ACPI_EXECUTE_GTS)
{
AcpiHwExecuteSleepMethod (METHOD_PATHNAME__GTS, SleepState);
}
/* Get current value of PM1A control */
Status = AcpiHwRegisterRead (ACPI_REGISTER_PM1_CONTROL,
&Pm1aControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
ACPI_DEBUG_PRINT ((ACPI_DB_INIT,
"Entering sleep state [S%u]\n", SleepState));
/* Clear the SLP_EN and SLP_TYP fields */
Pm1aControl &= ~(SleepTypeRegInfo->AccessBitMask |
SleepEnableRegInfo->AccessBitMask);
Pm1bControl = Pm1aControl;
/* Insert the SLP_TYP bits */
Pm1aControl |= (AcpiGbl_SleepTypeA << SleepTypeRegInfo->BitPosition);
Pm1bControl |= (AcpiGbl_SleepTypeB << SleepTypeRegInfo->BitPosition);
/*
* We split the writes of SLP_TYP and SLP_EN to workaround
* poorly implemented hardware.
*/
/* Write #1: write the SLP_TYP data to the PM1 Control registers */
Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Insert the sleep enable (SLP_EN) bit */
Pm1aControl |= SleepEnableRegInfo->AccessBitMask;
Pm1bControl |= SleepEnableRegInfo->AccessBitMask;
/* Flush caches, as per ACPI specification */
ACPI_FLUSH_CPU_CACHE ();
/* Write #2: Write both SLP_TYP + SLP_EN */
Status = AcpiHwWritePm1Control (Pm1aControl, Pm1bControl);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (SleepState > ACPI_STATE_S3)
{
/*
* We wanted to sleep > S3, but it didn't happen (by virtue of the
* fact that we are still executing!)
*
* Wait ten seconds, then try again. This is to get S4/S5 to work on
* all machines.
*
* We wait so long to allow chipsets that poll this reg very slowly
* to still read the right value. Ideally, this block would go
* away entirely.
*/
AcpiOsStall (10000000);
Status = AcpiHwRegisterWrite (ACPI_REGISTER_PM1_CONTROL,
SleepEnableRegInfo->AccessBitMask);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* Wait for transition back to Working State */
Retry = 1000;
do
{
Status = AcpiReadBitRegister (ACPI_BITREG_WAKE_STATUS, &InValue);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (AcpiGbl_EnableInterpreterSlack)
{
/*
* Some BIOSs don't set WAK_STS at all. Give up waiting after
* 1000 retries if it still isn't set.
*/
if (Retry-- == 0)
{
break;
}
}
} while (!InValue);
return_ACPI_STATUS (AE_OK);
}
static ACPI_STATUS
EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event, u_int gen_count)
{
ACPI_STATUS Status;
int count, i, slp_ival;
ACPI_SERIAL_ASSERT(ec);
Status = AE_NO_HARDWARE_RESPONSE;
int need_poll = cold || rebooting || ec_polled_mode || sc->ec_suspending;
/*
* The main CPU should be much faster than the EC. So the status should
* be "not ready" when we start waiting. But if the main CPU is really
* slow, it's possible we see the current "ready" response. Since that
* can't be distinguished from the previous response in polled mode,
* this is a potential issue. We really should have interrupts enabled
* during boot so there is no ambiguity in polled mode.
*
* If this occurs, we add an additional delay before actually entering
* the status checking loop, hopefully to allow the EC to go to work
* and produce a non-stale status.
*/
if (need_poll) {
static int once;
if (EcCheckStatus(sc, "pre-check", Event) == AE_OK) {
if (!once) {
device_printf(sc->ec_dev,
"warning: EC done before starting event wait\n");
once = 1;
}
AcpiOsStall(10);
}
}
/* Wait for event by polling or GPE (interrupt). */
if (need_poll) {
count = (ec_timeout * 1000) / EC_POLL_DELAY;
if (count == 0)
count = 1;
for (i = 0; i < count; i++) {
Status = EcCheckStatus(sc, "poll", Event);
if (Status == AE_OK)
break;
AcpiOsStall(EC_POLL_DELAY);
}
} else {
slp_ival = hz / 1000;
if (slp_ival != 0) {
count = ec_timeout;
} else {
/* hz has less than 1 ms resolution so scale timeout. */
slp_ival = 1;
count = ec_timeout / (1000 / hz);
}
/*
* Wait for the GPE to signal the status changed, checking the
* status register each time we get one. It's possible to get a
* GPE for an event we're not interested in here (i.e., SCI for
* EC query).
*/
for (i = 0; i < count; i++) {
if (gen_count != sc->ec_gencount) {
/*
* Record new generation count. It's possible the GPE was
* just to notify us that a query is needed and we need to
* wait for a second GPE to signal the completion of the
* event we are actually waiting for.
*/
gen_count = sc->ec_gencount;
Status = EcCheckStatus(sc, "sleep", Event);
if (Status == AE_OK)
break;
}
tsleep(&sc->ec_gencount, PZERO, "ecgpe", slp_ival);
}
/*
* We finished waiting for the GPE and it never arrived. Try to
* read the register once and trust whatever value we got. This is
* the best we can do at this point. Then, force polled mode on
* since this system doesn't appear to generate GPEs.
*/
if (Status != AE_OK) {
Status = EcCheckStatus(sc, "sleep_end", Event);
device_printf(sc->ec_dev,
"wait timed out (%sresponse), forcing polled mode\n",
Status == AE_OK ? "" : "no ");
ec_polled_mode = TRUE;
}
}
if (Status != AE_OK)
CTR0(KTR_ACPI, "error: ec wait timed out");
return (Status);
}
