reactos/drivers/bus/pcix/power.c

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/*
* PROJECT: ReactOS PCI Bus Driver
* LICENSE: BSD - See COPYING.ARM in the top level directory
* FILE: drivers/bus/pci/power.c
* PURPOSE: Bus/Device Power Management
* PROGRAMMERS: ReactOS Portable Systems Group
*/
/* INCLUDES *******************************************************************/
#include <pci.h>
#define NDEBUG
#include <debug.h>
/* GLOBALS ********************************************************************/
ULONG PciPowerDelayTable[PowerDeviceD3 * PowerDeviceD3] =
{
0, // D0 -> D0
0, // D1 -> D0
200, // D2 -> D0
10000, // D3 -> D0
0, // D0 -> D1
0, // D1 -> D1
200, // D2 -> D1
10000, // D3 -> D1
200, // D0 -> D2
200, // D1 -> D2
0, // D2 -> D2
10000, // D3 -> D2
10000, // D0 -> D3
10000, // D1 -> D3
10000, // D2 -> D3
0 // D3 -> D3
};
/* FUNCTIONS ******************************************************************/
NTSTATUS
NTAPI
PciStallForPowerChange(IN PPCI_PDO_EXTENSION PdoExtension,
IN DEVICE_POWER_STATE PowerState,
IN ULONG_PTR CapOffset)
{
ULONG PciState, TimeoutEntry, PmcsrOffset, TryCount;
PPCI_VERIFIER_DATA VerifierData;
LARGE_INTEGER Interval;
PCI_PMCSR Pmcsr;
KIRQL Irql;
/* Make sure the power state is valid, and the device can support it */
ASSERT((PdoExtension->PowerState.CurrentDeviceState >= PowerDeviceD0) &&
(PdoExtension->PowerState.CurrentDeviceState <= PowerDeviceD3));
ASSERT((PowerState >= PowerDeviceD0) && (PowerState <= PowerDeviceD3));
ASSERT(!(PdoExtension->HackFlags & PCI_HACK_NO_PM_CAPS));
/* Save the current IRQL */
Irql = KeGetCurrentIrql();
/* Pick the expected timeout for this transition */
TimeoutEntry = PciPowerDelayTable[PowerState * PdoExtension->PowerState.CurrentDeviceState];
/* PCI power states are one less than NT power states */
PciState = PowerState - 1;
/* The state status is stored in the PMCSR offset */
PmcsrOffset = CapOffset + FIELD_OFFSET(PCI_PM_CAPABILITY, PMCSR);
/* Try changing the power state up to 100 times */
TryCount = 100;
while (--TryCount)
{
/* Check if this state transition will take time */
if (TimeoutEntry > 0)
{
/* Check if this is happening at high IRQL */
if (Irql >= DISPATCH_LEVEL)
{
/* Can't wait at high IRQL, stall the processor */
KeStallExecutionProcessor(TimeoutEntry);
}
else
{
/* Do a wait for the timeout specified instead */
Interval.QuadPart = -10 * TimeoutEntry;
Interval.QuadPart -= KeQueryTimeIncrement() - 1;
KeDelayExecutionThread(0, 0, &Interval);
}
}
/* Read the PMCSR and see if the state has changed */
PciReadDeviceConfig(PdoExtension, &Pmcsr, PmcsrOffset, sizeof(PCI_PMCSR));
if (Pmcsr.PowerState == PciState) return STATUS_SUCCESS;
/* Try again, forcing a timeout of 1ms */
TimeoutEntry = 1000;
}
/* Call verifier with this error */
VerifierData = PciVerifierRetrieveFailureData(2);
ASSERT(VerifierData);
VfFailDeviceNode(PdoExtension->PhysicalDeviceObject,
PCI_VERIFIER_DETECTED_VIOLATION,
2, // The PMCSR register was not updated within the spec-mandated time.
VerifierData->FailureClass,
&VerifierData->AssertionControl,
VerifierData->DebuggerMessageText,
"%DevObj%Ulong",
PdoExtension->PhysicalDeviceObject,
PciState);
return STATUS_DEVICE_PROTOCOL_ERROR;
}
NTSTATUS
NTAPI
PciSetPowerManagedDevicePowerState(IN PPCI_PDO_EXTENSION DeviceExtension,
IN DEVICE_POWER_STATE DeviceState,
IN BOOLEAN IrpSet)
{
NTSTATUS Status;
PCI_PM_CAPABILITY PmCaps;
ULONG CapsOffset;
/* Assume success */
Status = STATUS_SUCCESS;
/* Check if this device can support low power states */
if (!(PciCanDisableDecodes(DeviceExtension, NULL, 0, TRUE)) &&
(DeviceState != PowerDeviceD0))
{
/* Simply return success, ignoring this request */
DPRINT1("Cannot disable decodes on this device, ignoring PM request...\n");
return Status;
}
/* Does the device support power management at all? */
if (!(DeviceExtension->HackFlags & PCI_HACK_NO_PM_CAPS))
{
/* Get the PM capabilities register */
CapsOffset = PciReadDeviceCapability(DeviceExtension,
DeviceExtension->CapabilitiesPtr,
PCI_CAPABILITY_ID_POWER_MANAGEMENT,
&PmCaps.Header,
sizeof(PCI_PM_CAPABILITY));
ASSERT(CapsOffset);
ASSERT(DeviceState != PowerDeviceUnspecified);
/* Check if the device is being powered up */
if (DeviceState == PowerDeviceD0)
{
/* Set full power state */
PmCaps.PMCSR.ControlStatus.PowerState = 0;
/* Check if the device supports Cold-D3 poweroff */
if (PmCaps.PMC.Capabilities.Support.PMED3Cold)
{
/* If there was a pending PME, clear it */
PmCaps.PMCSR.ControlStatus.PMEStatus = 1;
}
}
else
{
/* Otherwise, just set the new power state, converting from NT */
PmCaps.PMCSR.ControlStatus.PowerState = DeviceState - 1;
}
/* Write the new power state in the PMCSR */
PciWriteDeviceConfig(DeviceExtension,
&PmCaps.PMCSR,
CapsOffset + FIELD_OFFSET(PCI_PM_CAPABILITY, PMCSR),
sizeof(PCI_PMCSR));
/* Now wait for the change to "stick" based on the spec-mandated time */
Status = PciStallForPowerChange(DeviceExtension, DeviceState, CapsOffset);
if (!NT_SUCCESS(Status)) return Status;
}
else
{
/* Nothing to do! */
DPRINT1("No PM on this device, ignoring request\n");
}
/* Check if new resources have to be assigned */
if (IrpSet)
{
/* Check if the new device state is lower (higher power) than now */
if (DeviceState < DeviceExtension->PowerState.CurrentDeviceState)
{
/* We would normally re-assign resources after powerup */
UNIMPLEMENTED_DBGBREAK();
Status = STATUS_NOT_IMPLEMENTED;
}
}
/* Return the power state change status */
return Status;
}
NTSTATUS
NTAPI
PciFdoWaitWake(IN PIRP Irp,
IN PIO_STACK_LOCATION IoStackLocation,
IN PPCI_FDO_EXTENSION DeviceExtension)
{
UNREFERENCED_PARAMETER(Irp);
UNREFERENCED_PARAMETER(IoStackLocation);
UNREFERENCED_PARAMETER(DeviceExtension);
UNIMPLEMENTED;
while (TRUE);
return STATUS_NOT_SUPPORTED;
}
NTSTATUS
NTAPI
PciFdoSetPowerState(IN PIRP Irp,
IN PIO_STACK_LOCATION IoStackLocation,
IN PPCI_FDO_EXTENSION DeviceExtension)
{
UNREFERENCED_PARAMETER(Irp);
UNREFERENCED_PARAMETER(IoStackLocation);
UNREFERENCED_PARAMETER(DeviceExtension);
UNIMPLEMENTED;
while (TRUE);
return STATUS_NOT_SUPPORTED;
}
NTSTATUS
NTAPI
PciFdoIrpQueryPower(IN PIRP Irp,
IN PIO_STACK_LOCATION IoStackLocation,
IN PPCI_FDO_EXTENSION DeviceExtension)
{
UNREFERENCED_PARAMETER(Irp);
UNREFERENCED_PARAMETER(IoStackLocation);
UNREFERENCED_PARAMETER(DeviceExtension);
UNIMPLEMENTED;
while (TRUE);
return STATUS_NOT_SUPPORTED;
}
/* EOF */