ACPICA: Add support for PlatformRtMechanism OperationRegion handler

ACPICA commit cdf48b141d7da38e47fe4020310033ddd1971f9e

Writing a buffer to a PlatformRtMechanism FieldUnit invokes a
bidirectional transaction. The input buffer contains 26 bytes
containing 9 bytes of status, a command byte and a 16-byte UUID.
This change will will simply pass this incoming buffer to a handler
registered by the OS.

Link: https://github.com/acpica/acpica/commit/cdf48b14
Signed-off-by: Erik Kaneda <erik.kaneda@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/acutils.h

@@ -737,6 +737,8 @@ const char *acpi_ah_match_uuid(u8 *data);
  */
 #if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP || defined ACPI_HELP_APP)
 void acpi_ut_convert_string_to_uuid(char *in_string, u8 *uuid_buffer);
+
+acpi_status acpi_ut_convert_uuid_to_string(char *uuid_buffer, char *out_string);
 #endif
 
 #endif				/* _ACUTILS_H */

drivers/acpi/acpica/exfield.c

@@ -139,7 +139,9 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
 		    || obj_desc->field.region_obj->region.space_id ==
 		    ACPI_ADR_SPACE_GSBUS
 		    || obj_desc->field.region_obj->region.space_id ==
-		    ACPI_ADR_SPACE_IPMI)) {
+		    ACPI_ADR_SPACE_IPMI
+		    || obj_desc->field.region_obj->region.space_id ==
+		    ACPI_ADR_SPACE_PLATFORM_RT)) {
 
 		/* SMBus, GSBus, IPMI serial */
 
@@ -301,7 +303,9 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
 		    || obj_desc->field.region_obj->region.space_id ==
 		    ACPI_ADR_SPACE_GSBUS
 		    || obj_desc->field.region_obj->region.space_id ==
-		    ACPI_ADR_SPACE_IPMI)) {
+		    ACPI_ADR_SPACE_IPMI
+		    || obj_desc->field.region_obj->region.space_id ==
+		    ACPI_ADR_SPACE_PLATFORM_RT)) {
 
 		/* SMBus, GSBus, IPMI serial */
 

drivers/acpi/acpica/exserial.c

@@ -195,6 +195,12 @@ acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
 		function = ACPI_READ | (accessor_type << 16);
 		break;
 
+	case ACPI_ADR_SPACE_PLATFORM_RT:
+
+		buffer_length = ACPI_PRM_INPUT_BUFFER_SIZE;
+		function = ACPI_READ;
+		break;
+
 	default:
 		return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
 	}
@@ -311,6 +317,12 @@ acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
 		function = ACPI_WRITE | (accessor_type << 16);
 		break;
 
+	case ACPI_ADR_SPACE_PLATFORM_RT:
+
+		buffer_length = ACPI_PRM_INPUT_BUFFER_SIZE;
+		function = ACPI_WRITE;
+		break;
+
 	default:
 		return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
 	}

drivers/acpi/acpica/utuuid.c

@@ -61,4 +61,45 @@ void acpi_ut_convert_string_to_uuid(char *in_string, u8 *uuid_buffer)
 					       1]);
 	}
 }
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_convert_uuid_to_string
+ *
+ * PARAMETERS:  uuid_buffer         - 16-byte UUID buffer
+ *              out_string          - 36-byte formatted UUID string
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Convert 16-byte UUID buffer to 36-byte formatted UUID string
+ *              out_string must be 37 bytes to include null terminator.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_convert_uuid_to_string(char *uuid_buffer, char *out_string)
+{
+	u32 i;
+
+	if (!uuid_buffer || !out_string) {
+		return (AE_BAD_PARAMETER);
+	}
+
+	for (i = 0; i < UUID_BUFFER_LENGTH; i++) {
+		out_string[acpi_gbl_map_to_uuid_offset[i]] =
+		    acpi_ut_hex_to_ascii_char(uuid_buffer[i], 4);
+
+		out_string[acpi_gbl_map_to_uuid_offset[i] + 1] =
+		    acpi_ut_hex_to_ascii_char(uuid_buffer[i], 0);
+	}
+
+	/* Insert required hyphens (dashes) */
+
+	out_string[UUID_HYPHEN1_OFFSET] =
+	    out_string[UUID_HYPHEN2_OFFSET] =
+	    out_string[UUID_HYPHEN3_OFFSET] =
+	    out_string[UUID_HYPHEN4_OFFSET] = '-';
+
+	out_string[UUID_STRING_LENGTH] = 0;	/* Null terminate */
+	return (AE_OK);
+}
 #endif

include/acpi/acconfig.h

@@ -188,6 +188,8 @@
 #define ACPI_MAX_GSBUS_DATA_SIZE        255
 #define ACPI_MAX_GSBUS_BUFFER_SIZE      ACPI_SERIAL_HEADER_SIZE + ACPI_MAX_GSBUS_DATA_SIZE
 
+#define ACPI_PRM_INPUT_BUFFER_SIZE      26
+
 /* _sx_d and _sx_w control methods */
 
 #define ACPI_NUM_sx_d_METHODS           4