diff options
| author | Bob Moore <robert.moore@intel.com> | 2008-12-30 11:11:57 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-12-31 01:14:32 -0500 |
| commit | d3fd902d1ed43aebfc407c08d7ce86495604124c (patch) | |
| tree | ed72421413df5e76518a1945191e62981a923380 /drivers/acpi | |
| parent | 7db5d82d0278b506441ab6025f0c6ce2f2aa3019 (diff) | |
ACPICA: New: acpi_reset interface - write to reset register
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 <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/hardware/hwxface.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/acpi/hardware/hwxface.c b/drivers/acpi/hardware/hwxface.c index b6244a0fcf4..0601ed711f3 100644 --- a/drivers/acpi/hardware/hwxface.c +++ b/drivers/acpi/hardware/hwxface.c @@ -50,6 +50,43 @@ 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 * * PARAMETERS: Value - Where the value is returned |