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ACPICA: New: acpi_reset interface - write to reset register

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Uses the FADT-defined reset register and reset value. Checks the
FADT flags for the reset register supported bit. Supports reset
register in memory or I/O space, but not in PCI config space
since the host has the information to do it.

Signed-off-by: Bob Moore <[email protected]>
Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Bob Moore 2008-12-30 11:11:57 +08:00 • committed by Len Brown
commit d3fd902d1e
2 changed files with 39 additions and 0 deletions
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37
drivers/acpi/hardware/hwxface.c
View file

@ -48,6 +48,43 @@
#define _COMPONENT ACPI_HARDWARE
ACPI_MODULE_NAME("hwxface")
/******************************************************************************
*
* FUNCTION: acpi_reset
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Set reset register in memory or IO space. Note: Does not
* support reset register in PCI config space, this must be
* handled separately.
*
******************************************************************************/
acpi_status acpi_reset(void)
{
struct acpi_generic_address *reset_reg;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_reset);
reset_reg = &acpi_gbl_FADT.reset_register;
/* Check if the reset register is supported */
if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
!reset_reg->address) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
/* Write the reset value to the reset register */
status = acpi_write(acpi_gbl_FADT.reset_value, reset_reg);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_reset)
/******************************************************************************
*
* FUNCTION: acpi_read