chromeec: Support accessing memmap data over port 62/66

Some platforms cannot access the 900h-9ffh region over the LPC bus, so
it's necessary to access memmap data over the ACPI cmd / data ports.

BUG=chrome-os-partner:38224
TEST=Manual on Samus. Define EC_GOOGLE_CHROMEEC_ACPI_MEMMAP. Verify
system boots cleanly and battery status is updated immediately on plug /
unplug.
BRANCH=None

Change-Id: Ifbed938668d3770750a44105e40fccb9babf62ed
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 14762261a6a32b2e96ee835e852b2c9537436ae3
Original-Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Original-Change-Id: Idb516ff60b973d8833a41c45eac5765dafb8ec6d
Original-Reviewed-on: https://chromium-review.googlesource.com/262314
Original-Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: http://review.coreboot.org/9886
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/ec/google/chromeec/Kconfig

@@ -3,6 +3,14 @@ config EC_GOOGLE_CHROMEEC
 	help
 	  Google's Chrome EC
 
+config EC_GOOGLE_CHROMEEC_ACPI_MEMMAP
+	depends on EC_GOOGLE_CHROMEEC_LPC
+	def_bool n
+	help
+	  When defined, ACPI accesses EC memmap data on ports 66h/62h. When
+	  not defined, the memmap data is instead accessed on 900h-9ffh via
+	  the LPC bus.
+
 config EC_GOOGLE_CHROMEEC_I2C
 	depends on EC_GOOGLE_CHROMEEC
 	bool

src/ec/google/chromeec/acpi/ec.asl

@@ -41,7 +41,7 @@ Device (EC0)
 	Name (DWRN, 15)		// Battery capacity warning at 15%
 	Name (DLOW, 10)		// Battery capacity low at 10%
 
-	OperationRegion (ERAM, EmbeddedControl, 0x00, 0xff)
+	OperationRegion (ERAM, EmbeddedControl, 0x00, EC_ACPI_MEM_MAPPED_BEGIN)
 	Field (ERAM, ByteAcc, Lock, Preserve)
 	{
 		Offset (0x00),
@@ -56,48 +56,16 @@ Device (EC0)
 		CHGL, 8,	// Charger Current Limit
 	}
 
+#if CONFIG_EC_GOOGLE_CHROMEEC_ACPI_MEMMAP
+	OperationRegion (EMEM, EmbeddedControl,
+			 EC_ACPI_MEM_MAPPED_BEGIN, EC_ACPI_MEM_MAPPED_SIZE)
+	Field (EMEM, ByteAcc, Lock, Preserve)
+#else
 	OperationRegion (EMEM, SystemIO, EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE)
 	Field (EMEM, ByteAcc, NoLock, Preserve)
+#endif
 	{
-		Offset (0x00),
+		#include "emem.asl"
-		TIN0, 8,	// Temperature 0
-		TIN1, 8,	// Temperature 1
-		TIN2, 8,	// Temperature 2
-		TIN3, 8,	// Temperature 3
-		TIN4, 8,	// Temperature 4
-		TIN5, 8,	// Temperature 5
-		TIN6, 8,	// Temperature 6
-		TIN7, 8,	// Temperature 7
-		TIN8, 8,	// Temperature 8
-		TIN9, 8,	// Temperature 9
-		Offset (0x10),
-		FAN0, 16,	// Fan Speed 0
-		Offset (0x30),
-		LIDS, 1,	// Lid Switch State
-		PBTN, 1,	// Power Button Pressed
-		WPDI, 1,	// Write Protect Disabled
-		RECK, 1,	// Keyboard Initiated Recovery
-		RECD, 1,	// Dedicated Recovery Mode
-		Offset (0x40),
-		BTVO, 32,	// Battery Present Voltage
-		BTPR, 32,	// Battery Present Rate
-		BTRA, 32,	// Battery Remaining Capacity
-		ACEX, 1,	// AC Present
-		BTEX, 1,	// Battery Present
-		BFDC, 1,	// Battery Discharging
-		BFCG, 1,	// Battery Charging
-		BFCR, 1,	// Battery Level Critical
-		Offset (0x50),
-		BTDA, 32,	// Battery Design Capacity
-		BTDV, 32,	// Battery Design Voltage
-		BTDF, 32,	// Battery Last Full Charge Capacity
-		BTCC, 32,	// Battery Cycle Count
-		BMFG, 64,	// Battery Manufacturer String
-		BMOD, 64,	// Battery Model String
-		BSER, 64,	// Battery Serial String
-		BTYP, 64,	// Battery Type String
-		Offset (0x80),
-		ALS0, 16,	// ALS reading 0 in lux
 	}
 
 	Method (TINS, 1, Serialized)

src/ec/google/chromeec/acpi/emem.asl

@@ -0,0 +1,62 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 The Chromium OS Authors. All rights reserved.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * EMEM data may be accessed through port 62/66 or through LPC at 900h.
+ */
+
+Offset (0x00),
+TIN0, 8,	// Temperature 0
+TIN1, 8,	// Temperature 1
+TIN2, 8,	// Temperature 2
+TIN3, 8,	// Temperature 3
+TIN4, 8,	// Temperature 4
+TIN5, 8,	// Temperature 5
+TIN6, 8,	// Temperature 6
+TIN7, 8,	// Temperature 7
+TIN8, 8,	// Temperature 8
+TIN9, 8,	// Temperature 9
+Offset (0x10),
+FAN0, 16,	// Fan Speed 0
+Offset (0x30),
+LIDS, 1,	// Lid Switch State
+PBTN, 1,	// Power Button Pressed
+WPDI, 1,	// Write Protect Disabled
+RECK, 1,	// Keyboard Initiated Recovery
+RECD, 1,	// Dedicated Recovery Mode
+Offset (0x40),
+BTVO, 32,	// Battery Present Voltage
+BTPR, 32,	// Battery Present Rate
+BTRA, 32,	// Battery Remaining Capacity
+ACEX, 1,	// AC Present
+BTEX, 1,	// Battery Present
+BFDC, 1,	// Battery Discharging
+BFCG, 1,	// Battery Charging
+BFCR, 1,	// Battery Level Critical
+Offset (0x50),
+BTDA, 32,	// Battery Design Capacity
+BTDV, 32,	// Battery Design Voltage
+BTDF, 32,	// Battery Last Full Charge Capacity
+BTCC, 32,	// Battery Cycle Count
+BMFG, 64,	// Battery Manufacturer String
+BMOD, 64,	// Battery Model String
+BSER, 64,	// Battery Serial String
+BTYP, 64,	// Battery Type String
+Offset (0x80),
+ALS0, 16,	// ALS reading 0 in lux