apollolake: Add ACPI device for audio controller

Add the audio controller device to ACPI and define the _DSM handler
to return the address of the NHLT table, if set in NVS.

Change-Id: I619dbfb562b94255e42a3e5d5a3926c28b14db3e
Signed-off-by: Saurabh Satija <saurabh.satija@intel.com>
Reviewed-on: https://review.coreboot.org/15026
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Tested-by: build bot (Jenkins)

1 files changed, 84 insertions, 0 deletions

diff --git a/src/soc/intel/apollolake/acpi/pch_hda.asl b/src/soc/intel/apollolake/acpi/pch_hda.asl
new file mode 100644
index 0000000000..33cd771a88
--- /dev/null
+++ b/src/soc/intel/apollolake/acpi/pch_hda.asl
@@ -0,0 +1,84 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Corporation.
+ * Copyright (C) 2016 Google Inc.
+ *
+ * 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.
+ *
+ */
+
+/* Audio Controller - Device 14, Function 0 */
+
+Device (HDAS)
+{
+	Name (_ADR, 0x000E0000)
+	Name (_DDN, "Audio Controller")
+	Name (UUID, ToUUID("A69F886E-6CEB-4594-A41F-7B5DCE24C553"))
+
+	/* Device is D3 wake capable */
+	Name (_S0W, 3)
+
+	/* NHLT Table Address populated from GNVS values */
+	Name (NBUF, ResourceTemplate() {
+		QWordMemory (ResourceConsumer, PosDecode, MinFixed,
+			MaxFixed, Cacheable, ReadOnly,
+			0, 0, 0, 0, 1,,, NHLT, AddressRangeACPI)
+		}
+	)
+
+	/*
+	 * Device Specific Method
+	 * Arg0 - UUID
+	 * Arg1 - Revision
+	 * Arg2 - Function Index
+	*/
+	Method (_DSM, 4) {
+		If (LEqual (Arg0, ^UUID)) {
+			/*
+			 * Function 0: Function Support Query
+			 * Returns a bitmask of functions supported.
+			 */
+			If (LEqual (Arg2, Zero)) {
+				/*
+				 * NHLT Query only supported for revision 1 and
+				 * if NHLT address and length are set in NVS.
+				 */
+				If (LAnd (LEqual (Arg1, One),
+					LAnd (LNotEqual (NHLA, Zero),
+					     LNotEqual (NHLL, Zero)))) {
+					Return (Buffer (One) { 0x03 })
+				}
+				Else {
+					Return (Buffer (One) { 0x01 })
+				}
+			}
+
+			/*
+			 * Function 1: Query NHLT memory address used by
+			 * Intel Offload Engine Driver to discover any non-HDA
+			 * devices that are supported by the DSP.
+			 *
+			 * Returns a pointer to NHLT table in memory.
+			 */
+			If (LEqual (Arg2, One)) {
+				CreateQWordField (NBUF, ^NHLT._MIN, NBAS)
+				CreateQWordField (NBUF, ^NHLT._MAX, NMAS)
+				CreateQWordField (NBUF, ^NHLT._LEN, NLEN)
+				Store (NHLA, NBAS)
+				Store (NHLA, NMAS)
+				Store (NHLL, NLEN)
+				Return (NBUF)
+			}
+		}
+
+		Return (Buffer (One) { 0x00 })
+	}
+}