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Commit d3fd902d authored by Bob Moore's avatar Bob Moore Committed by Len Brown
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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: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 7db5d82d

drivers/acpi/hardware/hwxface.c

+37 −0
Original line number Diff line number Diff line
@@ -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

include/acpi/acpixf.h

+2 −0
Original line number Diff line number Diff line
@@ -322,6 +322,8 @@ acpi_resource_to_address64(struct acpi_resource *resource, 
/*

 * Hardware (ACPI device) interfaces

 */

acpi_status acpi_reset(void);



acpi_status acpi_get_register(u32 register_id, u32 * return_value);



acpi_status acpi_get_register_unlocked(u32 register_id, u32 *return_value);