ec/google/wilco/acpi: Add DPTF support

Add the support needed for DPTF.  This includes the methods to
write trip point values, read temperatures, and handle events.

This was tested on a sarien board by inspecting AML debug output
with the kernel while monitoring temperatures and trip points in
sysfs and controlling temperatures with a fan to ensure that when
a trip point is crossed an SCI is generated and the event is
handled properly.

Change-Id: I8d8570d176c0896fa709a6c782b319f58d3c1e52
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/29761
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 134 insertions, 0 deletions

diff --git a/src/ec/google/wilco/acpi/dptf.asl b/src/ec/google/wilco/acpi/dptf.asl
new file mode 100644
index 0000000000..f5545d0c79
--- /dev/null
+++ b/src/ec/google/wilco/acpi/dptf.asl
@@ -0,0 +1,134 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * Dynamic Platform Thermal Framework support
+ */
+
+External (\_SB.DPTF.CTOK, MethodObj)
+External (\_SB.DPTF.KTOC, MethodObj)
+External (\_SB.DPTF.TEVT, MethodObj)
+
+/* Mutex for EC PAT interface */
+Mutex (PATM, 1)
+
+/* Read requested temperature sensor */
+Method (TSRD, 1, Serialized)
+{
+	If (Acquire (^PATM, 1000)) {
+		Return (0)
+	}
+
+	/* Set sensor ID */
+	W (DWTI, ToInteger (Arg0))
+
+	Local0 = R (DRTV)
+
+	Release (^PATM)
+	Return (\_SB.DPTF.CTOK (Local0))
+}
+
+/*
+ * Set Aux Trip Point 0
+ *   Arg0 = Temp Sensor ID
+ *   Arg1 = Value to set
+ */
+Method (PAT0, 2, Serialized)
+{
+	If (Acquire (^PATM, 1000)) {
+		Return (0)
+	}
+
+	/* Set sensor ID */
+	W (DWTI, ToInteger (Arg0))
+
+	/* Set LOW trip point for this sensor */
+	W (DWTL, \_SB.DPTF.KTOC (Arg1))
+
+	Release (^PATM)
+	Return (1)
+}
+
+/*
+ * Set Aux Trip Point 1
+ *   Arg0 = Temp Sensor ID
+ *   Arg1 = Value to set
+ */
+Method (PAT1, 2, Serialized)
+{
+	If (Acquire (^PATM, 1000)) {
+		Return (0)
+	}
+
+	/* Set sensor ID */
+	W (DWTI, ToInteger (Arg0))
+
+	/* Set HIGH trip point for this sensor */
+	W (DWTH, \_SB.DPTF.KTOC (Arg1))
+
+	Release (^PATM)
+	Return (1)
+}
+
+/*
+ * Disable Aux Trip Points
+ *   Arg0 = Temp Sensor ID
+ */
+Method (PATD, 1, Serialized)
+{
+	If (Acquire (^PATM, 1000)) {
+		Return (0)
+	}
+
+	/* Set sensor ID */
+	W (DWTI, ToInteger (Arg0))
+
+	/* Disable LOW and HIGH trip points */
+	W (DWTL, 0xff)
+	W (DWTH, 0xff)
+
+	Release (^PATM)
+	Return (1)
+}
+
+/*
+ * Handle sensor trip events
+ */
+Method (PATX, 0, Serialized)
+{
+	Local0 = R (DRTQ)
+	Local1 = Local0
+
+	Printf ("Sensor trip mask: %o", Local0)
+
+	If (LNot (Acquire (^PATM, 1000))) {
+
+		/* Handle bits that are set */
+		While (FindSetRightBit (Local1, Local2))
+		{
+			/* DPTF will Notify sensor devices */
+			\_SB.DPTF.TEVT (Local2)
+
+			/* Clear current sensor number */
+			Local1 &= ~(1 << (Local2 - 1))
+		}
+
+		Release (^PATM)
+	}
+
+	/* Clear sensor events */
+	W (DWTQ, Local0)
+}