intel/apollolake: Add support to enable google ChromeEC

ChromeEC is needed for EC controlled features to work properly.
This patch adds neccessary support in soc/intel so that mainboard
asl files can include the ChromeEC e.g. PNOT method and
LPCB and also the nvs fields.

BUG = 53096
TEST = This patch is needed by the mainboard specific ASL change to include
       src/ec/google/chromeec/acpi/ec.asl

Change-Id: Icecc437df05cd3efb41579317a353fd22526e0c9
Signed-off-by: Shaunak Saha <shaunak.saha@intel.com>
Reviewed-on: https://review.coreboot.org/14967
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/acpi/cpu.asl

@@ -0,0 +1,118 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 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.
+ */
+
+/* These devices are created at runtime */
+External (\_PR.CP00, DeviceObj)
+External (\_PR.CP01, DeviceObj)
+External (\_PR.CP02, DeviceObj)
+External (\_PR.CP03, DeviceObj)
+External (\_PR.CP04, DeviceObj)
+External (\_PR.CP05, DeviceObj)
+External (\_PR.CP06, DeviceObj)
+External (\_PR.CP07, DeviceObj)
+
+/* Notify OS to re-read CPU tables, assuming ^2 CPU count */
+Method (PNOT)
+{
+	If (LGreaterEqual (\PCNT, 2)) {
+		Notify (\_PR.CP00, 0x81)  // _CST
+		Notify (\_PR.CP01, 0x81)  // _CST
+	}
+	If (LGreaterEqual (\PCNT, 4)) {
+		Notify (\_PR.CP02, 0x81)  // _CST
+		Notify (\_PR.CP03, 0x81)  // _CST
+	}
+	If (LGreaterEqual (\PCNT, 8)) {
+		Notify (\_PR.CP04, 0x81)  // _CST
+		Notify (\_PR.CP05, 0x81)  // _CST
+		Notify (\_PR.CP06, 0x81)  // _CST
+		Notify (\_PR.CP07, 0x81)  // _CST
+	}
+}
+
+/* Notify OS to re-read CPU _PPC limit, assuming ^2 CPU count */
+Method (PPCN)
+{
+	If (LGreaterEqual (\PCNT, 2)) {
+		Notify (\_PR.CP00, 0x80)  // _PPC
+		Notify (\_PR.CP01, 0x80)  // _PPC
+	}
+	If (LGreaterEqual (\PCNT, 4)) {
+		Notify (\_PR.CP02, 0x80)  // _PPC
+		Notify (\_PR.CP03, 0x80)  // _PPC
+	}
+	If (LGreaterEqual (\PCNT, 8)) {
+		Notify (\_PR.CP04, 0x80)  // _PPC
+		Notify (\_PR.CP05, 0x80)  // _PPC
+		Notify (\_PR.CP06, 0x80)  // _PPC
+		Notify (\_PR.CP07, 0x80)  // _PPC
+	}
+}
+
+/* Notify OS to re-read Throttle Limit tables, assuming ^2 CPU count */
+Method (TNOT)
+{
+	If (LGreaterEqual (\PCNT, 2)) {
+		Notify (\_PR.CP00, 0x82)  // _TPC
+		Notify (\_PR.CP01, 0x82)  // _TPC
+	}
+	If (LGreaterEqual (\PCNT, 4)) {
+		Notify (\_PR.CP02, 0x82)  // _TPC
+		Notify (\_PR.CP03, 0x82)  // _TPC
+	}
+	If (LGreaterEqual (\PCNT, 8)) {
+		Notify (\_PR.CP04, 0x82)  // _TPC
+		Notify (\_PR.CP05, 0x82)  // _TPC
+		Notify (\_PR.CP06, 0x82)  // _TPC
+		Notify (\_PR.CP07, 0x82)  // _TPC
+	}
+}
+
+/* Return a package containing enabled processor entries */
+Method (PPKG)
+{
+	If (LGreaterEqual (\PCNT, 8)) {
+		Return (Package()
+		{
+			\_PR.CP00,
+			\_PR.CP01,
+			\_PR.CP02,
+			\_PR.CP03,
+			\_PR.CP04,
+			\_PR.CP05,
+			\_PR.CP06,
+			\_PR.CP07
+		})
+	} ElseIf (LGreaterEqual (\PCNT, 4)) {
+		Return (Package ()
+		{
+			\_PR.CP00,
+			\_PR.CP01,
+			\_PR.CP02,
+			\_PR.CP03
+		})
+	} ElseIf (LGreaterEqual (\PCNT, 2)) {
+		Return (Package ()
+		{
+			\_PR.CP00,
+			\_PR.CP01
+		})
+	} Else {
+		Return (Package ()
+		{
+			\_PR.CP00
+		})
+	}
+}

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

@@ -26,8 +26,13 @@ External (NVSA)
 OperationRegion (GNVS, SystemMemory, NVSA, 0x1000)
 Field (GNVS, ByteAcc, NoLock, Preserve)
 {
-	/* Nothing here yet, folks */
+	/* Miscellaneous */
 	Offset (0x00),
+	PCNT,	8,      // 0x01 - Processor Count
+	PPCM,	8,      // 0x02 - Max PPC State
+	LIDS,	8,      // 0x03 - LID State
+	PWRS,	8,      // 0x04 - AC Power State
+	DPTE,	8,      // 0x05 - Enable DPTF
 
 	/* ChromeOS stuff (0x100 -> 0xfff, size 0xeff) */
 	Offset (0x100),

src/soc/intel/apollolake/acpi/lpc.asl

@@ -0,0 +1,23 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2013 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.
+ */
+
+/* Intel LPC Bus Device  - 0:1f.0 */
+
+Device (LPCB)
+{
+	Name (_ADR, 0x001f0000)
+}

src/soc/intel/apollolake/acpi/southbridge.asl

@@ -27,3 +27,6 @@
 #include "gpio.asl"
 
 #include "xhci.asl"
+
+/* LPC */
+#include "lpc.asl"

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

@@ -28,7 +28,12 @@
 
 struct global_nvs_t {
 	/* Miscellaneous */
-	uint8_t unused[256];
+	uint8_t	pcnt; /* 0x01 - Processor Count */
+	uint8_t	ppcm; /* 0x02 - Max PPC State */
+	uint8_t	lids; /* 0x03 - LID State */
+	uint8_t	pwrs; /* 0x04 - AC Power State */
+	uint8_t	dpte; /* 0x05 - Enable DPTF */
+	uint8_t	unused[251];
 
 	/* ChromeOS specific (0x100 - 0xfff) */
 	chromeos_acpi_t chromeos;