intel/skylake: 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 it has been set in NVS.

BUG=chrome-os-partner:47346
BRANCH=none
TEST=build and boot on glados and chell

Change-Id: I8dc186a8bb79407b69ef32fb224a7c0f85c05bc4
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 6b73fba375f83f175d0b73e5e70a058a6c259e0d
Original-Change-Id: Ia9bedbae198e53fe415adc086a44b8b29b7f611d
Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/313824
Original-Commit-Ready: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/12597
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/soc/intel/skylake/acpi/globalnvs.asl

@@ -61,6 +61,8 @@ Field (GNVS, ByteAcc, NoLock, Preserve)
 	PM1I,	64,	// 0x20 - 0x27 - PM1 wake status bit
 	GPEI,	64,	// 0x28 - 0x2f - GPE wake status bit
 	DPTE,	8,	// 0x30 - Enable DPTF
+	NHLA,	64,	// 0x31 - NHLT Address
+	NHLL,	32,	// 0x39 - NHLT Length
 
 	/* ChromeOS specific */
 	Offset (0x100),

src/soc/intel/skylake/acpi/pch.asl

@@ -30,6 +30,9 @@
 /* LPC 0:1f.0 */
 #include "lpc.asl"
 
+/* PCH HDA */
+#include "pch_hda.asl"
+
 /* PCIE Ports */
 #include "pcie.asl"
 

src/soc/intel/skylake/acpi/pch_hda.asl

@@ -0,0 +1,88 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Intel Corporation.
+ * Copyright (C) 2015 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+/* Audio Controller - Device 31, Function 3 */
+
+Device (HDAS)
+{
+	Name (_ADR, 0x001F0003)
+	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, NonCacheable, 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 })
+	}
+}

src/soc/intel/skylake/include/soc/nvs.h

@@ -51,8 +51,9 @@ typedef struct {
 	u64	pm1i; /* 0x20 - 0x27 - PM1 wake status bit */
 	u64	gpei; /* 0x28 - 0x2f - GPE wake status bit */
 	u8	dpte; /* 0x30 - Enable DPTF */
-
-	u8	unused[207];
+	u64	nhla; /* 0x31 - NHLT Address */
+	u32	nhll; /* 0x39 - NHLT Length */
+	u8	unused[195];
 
 	/* ChromeOS specific (0x100 - 0xfff) */
 	chromeos_acpi_t chromeos;