soc/amd/picasso/acpi/cpu: move WAL1 method that calls ALIB to common

TEST=Mandolin still boots into Linux and there's no ACPI warning in
dmesg.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I7e6d38ebeae5e55a4a65930b989838532ab9c446
Reviewed-on: https://review.coreboot.org/c/coreboot/+/53920
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/soc/amd/common/acpi/alib.asl b/src/soc/amd/common/acpi/alib.asl
new file mode 100644
index 0000000000..bf4a1376a5
--- /dev/null
+++ b/src/soc/amd/common/acpi/alib.asl
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/alib.h>
+
+/* The ALIB method object is defined in an SSDT */
+External(\_SB.ALIB, MethodObj)
+
+/* Wrapper method that calls ALIB function 1 to report current AC/DC state. */
+Method (WAL1)
+{
+	/* Send ALIB Function 1 the AC/DC state */
+	Local0 = Buffer (0x03) {}
+	CreateWordField (Local0, 0, F1SZ)
+	CreateByteField (Local0, 2, F1DA)
+
+	/* First argument is size i.e. 3 bytes */
+	F1SZ = 3
+
+	/*
+	 * Second argument is power state i.e. AC or DC.
+	 * ALIB expects AC = 0, DC = 1.
+	 * PWRS reports AC = 1, DC = 0.
+	 *
+	 * Hence, need to invert the state of PWRS.
+	 */
+	F1DA = \PWRS ^ 1
+
+	Printf ("ALIB call: func 1 params %o", Local0)
+	\_SB.ALIB (ALIB_FUNCTION_REPORT_AC_DC_STATE, Local0)
+}