google/chromeec: Add common infrastructure for boot-mode switches

Instead of defining the same functions for reading/clearing boot-mode
switches from EC in every mainboard, add a common infrastructure to
enable common functions for handling boot-mode switches if
GOOGLE_CHROMEEC is being used.

Only boards that were not moved to this new infrastructure are those
that do not use GOOGLE_CHROMEEC or which rely on some mainboard specific
mechanism for reading boot-mode switches.

BUG=None
BRANCH=None
TEST=abuild compiles all boards successfully with and without ChromeOS
option.

Change-Id: I267aadea9e616464563df04b51a668b877f0d578
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17449
Tested-by: build bot (Jenkins)
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/ec/google/chromeec/Kconfig

@@ -158,3 +158,10 @@ config EC_GOOGLE_CHROMEEC_PD_FIRMWARE_FILE
 	depends on EC_GOOGLE_CHROMEEC_PD_FIRMWARE_EXTERNAL
 	help
 	  The path and filename of the PD firmware file to use.
+
+config EC_GOOGLE_CHROMEEC_SWITCHES
+	depends on EC_GOOGLE_CHROMEEC && CHROMEOS
+	bool
+	help
+	  Enable support for Chrome OS mode switches provided by the Chrome OS
+	  EC.

src/ec/google/chromeec/Makefile.inc

@@ -29,6 +29,10 @@ smm-$(CONFIG_VBOOT) += vboot_storage.c
 romstage-$(CONFIG_VBOOT) += vboot_storage.c
 verstage-$(CONFIG_VBOOT) += vboot_storage.c
 
+verstage-$(CONFIG_EC_GOOGLE_CHROMEEC_SWITCHES) += switches.c
+romstage-$(CONFIG_EC_GOOGLE_CHROMEEC_SWITCHES) += switches.c
+ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_SWITCHES) += switches.c
+
 CHROMEEC_SOURCE ?= $(top)/3rdparty/chromeec
 
 # These are Chrome EC firmware images that a payload (such as depthcharge) can

src/ec/google/chromeec/switches.c

@@ -0,0 +1,59 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 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.
+ */
+
+#include <bootmode.h>
+#include <ec/google/chromeec/ec.h>
+
+#if IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC_LPC)
+int get_lid_switch(void)
+{
+	if (!IS_ENABLED(CONFIG_LID_SWITCH))
+		return -1;
+
+	return !!(google_chromeec_get_switches() & EC_SWITCH_LID_OPEN);
+}
+#endif
+
+int get_recovery_mode_switch(void)
+{
+	/* Check for dedicated recovery switch first. */
+	if (IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC_LPC) &&
+	    (google_chromeec_get_switches() & EC_SWITCH_DEDICATED_RECOVERY))
+		return 1;
+
+	/* Check if the EC has posted the keyboard recovery/fastboot event. */
+	return !!(google_chromeec_get_events_b() &
+		  (EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY) |
+		   EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_FASTBOOT)));
+}
+
+int get_recovery_mode_retrain_switch(void)
+{
+	/*
+	 * Check if the EC has posted the keyboard recovery event with memory
+	 * retrain.
+	 */
+	return !!(google_chromeec_get_events_b() &
+		EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY_HW_REINIT));
+}
+
+int clear_recovery_mode_switch(void)
+{
+	/* Clear all host event bits requesting recovery mode. */
+	return google_chromeec_clear_events_b(
+		EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY) |
+		EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY_HW_REINIT) |
+		EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_FASTBOOT));
+}