From: Bob Moore <robert.moore@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Lin Ming <ming.m.lin@xxxxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
---
drivers/acpi/hardware/hwxface.c | 37 +++++++++++++++++++++++++++++++++++++
include/acpi/acpixf.h | 2 ++
2 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/hardware/hwxface.c b/drivers/acpi/hardware/hwxface.c
index b6244a0..0601ed7 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
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 030aeb5..b3bcead 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -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);
--
1.5.6.6
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
