vboot_logic: Set VB2_CONTEXT_EC_TRUSTED in verstage_main

vboot_reference is introducing a new field (ctx) to store the current
boot mode in crrev/c/2944250 (ctx->bootmode), which will be leveraged
in both vboot flow and elog_add_boot_reason in coreboot.

In current steps of deciding bootmode, a function vb2ex_ec_trusted
is required. This function checks gpio EC_IN_RW pin and will return
'trusted' only if EC is not in RW. Therefore, we need to implement
similar utilities in coreboot.

We will deprecate vb2ex_ec_trusted and use the flag,
VB2_CONTEXT_EC_TRUSTED, in vboot, vb2api_fw_phase1 and set that flag
in coreboot, verstage_main.

Also add a help function get_ec_is_trusted which needed to be
implemented per mainboard.

BUG=b:177196147, b:181931817
BRANCH=none
TEST=Test on trogdor if manual recovery works

Signed-off-by: Hsuan Ting Chen <roccochen@chromium.org>
Change-Id: I479c8f80e45cc524ba87db4293d19b29bdfa2192
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57048
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

45 files changed, 304 insertions, 0 deletions

diff --git a/src/mainboard/google/asurada/chromeos.c b/src/mainboard/google/asurada/chromeos.c
index 6f8f24281a..1aa8876ca4 100644
--- a/src/mainboard/google/asurada/chromeos.c
+++ b/src/mainboard/google/asurada/chromeos.c
@@ -40,3 +40,9 @@ int tis_plat_irq_status(void)
 {
 	return gpio_eint_poll(GPIO_H1_AP_INT);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. This is active low. */
+	return !!gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/auron/chromeos.c b/src/mainboard/google/auron/chromeos.c
index 50eeddce0a..f449c9cf7f 100644
--- a/src/mainboard/google/auron/chromeos.c
+++ b/src/mainboard/google/auron/chromeos.c
@@ -8,6 +8,13 @@
 /* SPI Write protect is GPIO 16 */
 #define CROS_WP_GPIO	58
 
+/* EC_IN_RW is GPIO 25 in samus and 14 otherwise */
+#if CONFIG(BOARD_GOOGLE_SAMUS)
+#define EC_IN_RW_GPIO	25
+#else
+#define EC_IN_RW_GPIO	14
+#endif
+
 void fill_lb_gpios(struct lb_gpios *gpios)
 {
 	struct lb_gpio chromeos_gpios[] = {
@@ -32,3 +39,9 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !get_gpio(EC_IN_RW_GPIO);
+}
diff --git a/src/mainboard/google/beltino/chromeos.c b/src/mainboard/google/beltino/chromeos.c
index a33caca37a..5c49649ef4 100644
--- a/src/mainboard/google/beltino/chromeos.c
+++ b/src/mainboard/google/beltino/chromeos.c
@@ -65,3 +65,10 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/brya/chromeos.c b/src/mainboard/google/brya/chromeos.c
index add73464da..184cd52104 100644
--- a/src/mainboard/google/brya/chromeos.c
+++ b/src/mainboard/google/brya/chromeos.c
@@ -29,3 +29,9 @@ void mainboard_chromeos_acpi_generate(void)
 	gpios = variant_cros_gpios(&num);
 	chromeos_acpi_gpio_generate(gpios, num);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/butterfly/chromeos.c b/src/mainboard/google/butterfly/chromeos.c
index 356e97b7b5..960dd87990 100644
--- a/src/mainboard/google/butterfly/chromeos.c
+++ b/src/mainboard/google/butterfly/chromeos.c
@@ -77,3 +77,10 @@ void mainboard_chromeos_acpi_generate(void)
 
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/cherry/chromeos.c b/src/mainboard/google/cherry/chromeos.c
index 748e06e28d..13b673cf07 100644
--- a/src/mainboard/google/cherry/chromeos.c
+++ b/src/mainboard/google/cherry/chromeos.c
@@ -59,3 +59,9 @@ int tis_plat_irq_status(void)
 {
 	return gpio_eint_poll(GPIO_GSC_AP_INT);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. This is active low. */
+	return !!gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/cyan/chromeos.c b/src/mainboard/google/cyan/chromeos.c
index b88862ca59..4a48aeb78b 100644
--- a/src/mainboard/google/cyan/chromeos.c
+++ b/src/mainboard/google/cyan/chromeos.c
@@ -12,6 +12,8 @@
 
 #define WP_GPIO			GP_E_22
 
+#define EC_IN_RW_GPIO		GP_SW_77
+
 #define ACTIVE_LOW	0
 #define ACTIVE_HIGH	1
 
@@ -62,3 +64,9 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(EC_IN_RW_GPIO);
+}
diff --git a/src/mainboard/google/daisy/chromeos.c b/src/mainboard/google/daisy/chromeos.c
index 7599295f1f..9cb57f869e 100644
--- a/src/mainboard/google/daisy/chromeos.c
+++ b/src/mainboard/google/daisy/chromeos.c
@@ -37,3 +37,9 @@ int get_write_protect_state(void)
 {
 	return !gpio_get_value(GPIO_D16);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get_value(GPIO_D17);
+}
diff --git a/src/mainboard/google/dedede/chromeos.c b/src/mainboard/google/dedede/chromeos.c
index fb904cca83..6be765244d 100644
--- a/src/mainboard/google/dedede/chromeos.c
+++ b/src/mainboard/google/dedede/chromeos.c
@@ -30,3 +30,9 @@ void mainboard_chromeos_acpi_generate(void)
 	gpios = variant_cros_gpios(&num);
 	chromeos_acpi_gpio_generate(gpios, num);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/deltaur/chromeos.c b/src/mainboard/google/deltaur/chromeos.c
index 9d3929e1df..b2c34a2161 100644
--- a/src/mainboard/google/deltaur/chromeos.c
+++ b/src/mainboard/google/deltaur/chromeos.c
@@ -111,3 +111,10 @@ void mainboard_prepare_cr50_reset(void)
 	if (ENV_RAMSTAGE)
 		pmc_soc_set_afterg3_en(true);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/drallion/chromeos.c b/src/mainboard/google/drallion/chromeos.c
index d92ebb133d..607f7c3d99 100644
--- a/src/mainboard/google/drallion/chromeos.c
+++ b/src/mainboard/google/drallion/chromeos.c
@@ -110,3 +110,10 @@ void mainboard_prepare_cr50_reset(void)
 	pmc_soc_set_afterg3_en(true);
 #endif
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/eve/chromeos.c b/src/mainboard/google/eve/chromeos.c
index 11931c676d..10a837d58e 100644
--- a/src/mainboard/google/eve/chromeos.c
+++ b/src/mainboard/google/eve/chromeos.c
@@ -34,3 +34,9 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/fizz/chromeos.c b/src/mainboard/google/fizz/chromeos.c
index a74c2f7091..593982beed 100644
--- a/src/mainboard/google/fizz/chromeos.c
+++ b/src/mainboard/google/fizz/chromeos.c
@@ -34,3 +34,9 @@ void mainboard_chromeos_acpi_generate(void)
 	gpios = variant_cros_gpios(&num);
 	chromeos_acpi_gpio_generate(gpios, num);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/foster/chromeos.c b/src/mainboard/google/foster/chromeos.c
index 38d12cb696..8ed41cd2a5 100644
--- a/src/mainboard/google/foster/chromeos.c
+++ b/src/mainboard/google/foster/chromeos.c
@@ -26,3 +26,10 @@ int get_write_protect_state(void)
 {
 	return 0;
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/gale/chromeos.c b/src/mainboard/google/gale/chromeos.c
index 4674581da8..ac464b4c89 100644
--- a/src/mainboard/google/gale/chromeos.c
+++ b/src/mainboard/google/gale/chromeos.c
@@ -157,3 +157,10 @@ int get_write_protect_state(void)
 {
 	return !read_gpio(get_wp_status_gpio_pin());
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/glados/chromeos.c b/src/mainboard/google/glados/chromeos.c
index 6a1f0b4358..70b4f641cd 100644
--- a/src/mainboard/google/glados/chromeos.c
+++ b/src/mainboard/google/glados/chromeos.c
@@ -33,3 +33,9 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/gru/chromeos.c b/src/mainboard/google/gru/chromeos.c
index 688c0dd27a..479ca3d85d 100644
--- a/src/mainboard/google/gru/chromeos.c
+++ b/src/mainboard/google/gru/chromeos.c
@@ -49,3 +49,9 @@ int tis_plat_irq_status(void)
 	return gpio_irq_status(GPIO_TPM_IRQ);
 }
 #endif
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/guybrush/chromeos.c b/src/mainboard/google/guybrush/chromeos.c
index f12995762f..c1621d917e 100644
--- a/src/mainboard/google/guybrush/chromeos.c
+++ b/src/mainboard/google/guybrush/chromeos.c
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
 #include <baseboard/gpio.h>
+#include <boardid.h>
 #include <boot/coreboot_tables.h>
 #include <gpio.h>
 #include <vendorcode/google/chromeos/chromeos.h>
@@ -24,3 +25,14 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Board versions 1 & 2 support H1 DB, but the EC_IN_RW signal is not
+	   routed. So emulate EC is trusted. */
+	if (CONFIG(BOARD_GOOGLE_GUYBRUSH) &&
+	    (board_id() == UNDEFINED_STRAPPING_ID || board_id() < 3))
+		return 1;
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/hatch/chromeos.c b/src/mainboard/google/hatch/chromeos.c
index ee54ade334..400a3fa044 100644
--- a/src/mainboard/google/hatch/chromeos.c
+++ b/src/mainboard/google/hatch/chromeos.c
@@ -34,3 +34,9 @@ void mainboard_chromeos_acpi_generate(void)
 
 	chromeos_acpi_gpio_generate(cros_gpios, num_gpios);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/herobrine/chromeos.c b/src/mainboard/google/herobrine/chromeos.c
index 643dcc2477..319f929d8b 100644
--- a/src/mainboard/google/herobrine/chromeos.c
+++ b/src/mainboard/google/herobrine/chromeos.c
@@ -18,3 +18,9 @@ void fill_lb_gpios(struct lb_gpios *gpios)
 
 	lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Stub GPIO. */
+	return 0;
+}
diff --git a/src/mainboard/google/jecht/chromeos.c b/src/mainboard/google/jecht/chromeos.c
index cf59636073..bc00994a44 100644
--- a/src/mainboard/google/jecht/chromeos.c
+++ b/src/mainboard/google/jecht/chromeos.c
@@ -67,3 +67,10 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/kahlee/chromeos.c b/src/mainboard/google/kahlee/chromeos.c
index b85f976890..1f81f222a7 100644
--- a/src/mainboard/google/kahlee/chromeos.c
+++ b/src/mainboard/google/kahlee/chromeos.c
@@ -32,3 +32,9 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/kukui/chromeos.c b/src/mainboard/google/kukui/chromeos.c
index 3f15a3fb91..4c4a8bec03 100644
--- a/src/mainboard/google/kukui/chromeos.c
+++ b/src/mainboard/google/kukui/chromeos.c
@@ -37,3 +37,9 @@ int tis_plat_irq_status(void)
 {
 	return gpio_eint_poll(CR50_IRQ);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(EC_IN_RW);
+}
diff --git a/src/mainboard/google/link/chromeos.c b/src/mainboard/google/link/chromeos.c
index 540803ca1a..ce9a33dd0c 100644
--- a/src/mainboard/google/link/chromeos.c
+++ b/src/mainboard/google/link/chromeos.c
@@ -6,6 +6,8 @@
 #include <southbridge/intel/common/gpio.h>
 #include <vendorcode/google/chromeos/chromeos.h>
 
+#define GPIO_EC_IN_RW 21
+
 void fill_lb_gpios(struct lb_gpios *gpios)
 {
 	struct lb_gpio chromeos_gpios[] = {
@@ -37,3 +39,9 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !get_gpio(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/mistral/chromeos.c b/src/mainboard/google/mistral/chromeos.c
index c827c7d13d..171a8ee6bd 100644
--- a/src/mainboard/google/mistral/chromeos.c
+++ b/src/mainboard/google/mistral/chromeos.c
@@ -1,8 +1,16 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <boot/coreboot_tables.h>
+#include <vendorcode/google/chromeos/chromeos.h>
 
 void fill_lb_gpios(struct lb_gpios *gpios)
 {
 
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/nyan/chromeos.c b/src/mainboard/google/nyan/chromeos.c
index 7fe877bff0..9aaad2f191 100644
--- a/src/mainboard/google/nyan/chromeos.c
+++ b/src/mainboard/google/nyan/chromeos.c
@@ -19,3 +19,9 @@ int get_write_protect_state(void)
 {
 	return !gpio_get(GPIO(R1));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO(U4));
+}
diff --git a/src/mainboard/google/nyan_big/chromeos.c b/src/mainboard/google/nyan_big/chromeos.c
index 7fe877bff0..9aaad2f191 100644
--- a/src/mainboard/google/nyan_big/chromeos.c
+++ b/src/mainboard/google/nyan_big/chromeos.c
@@ -19,3 +19,9 @@ int get_write_protect_state(void)
 {
 	return !gpio_get(GPIO(R1));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO(U4));
+}
diff --git a/src/mainboard/google/nyan_blaze/chromeos.c b/src/mainboard/google/nyan_blaze/chromeos.c
index 7fe877bff0..9aaad2f191 100644
--- a/src/mainboard/google/nyan_blaze/chromeos.c
+++ b/src/mainboard/google/nyan_blaze/chromeos.c
@@ -19,3 +19,9 @@ int get_write_protect_state(void)
 {
 	return !gpio_get(GPIO(R1));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO(U4));
+}
diff --git a/src/mainboard/google/oak/chromeos.c b/src/mainboard/google/oak/chromeos.c
index 9e7af27382..739df2e25b 100644
--- a/src/mainboard/google/oak/chromeos.c
+++ b/src/mainboard/google/oak/chromeos.c
@@ -34,3 +34,9 @@ int get_write_protect_state(void)
 {
 	return !gpio_get(WRITE_PROTECT);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(EC_IN_RW);
+}
diff --git a/src/mainboard/google/octopus/chromeos.c b/src/mainboard/google/octopus/chromeos.c
index 03d3b4f0fa..4a7f040c47 100644
--- a/src/mainboard/google/octopus/chromeos.c
+++ b/src/mainboard/google/octopus/chromeos.c
@@ -33,3 +33,9 @@ void mainboard_chromeos_acpi_generate(void)
 	gpios = variant_cros_gpios(&num);
 	chromeos_acpi_gpio_generate(gpios, num);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/parrot/chromeos.c b/src/mainboard/google/parrot/chromeos.c
index 03b0d476f3..346fe76aa9 100644
--- a/src/mainboard/google/parrot/chromeos.c
+++ b/src/mainboard/google/parrot/chromeos.c
@@ -68,3 +68,10 @@ void mainboard_chromeos_acpi_generate(void)
 
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/peach_pit/chromeos.c b/src/mainboard/google/peach_pit/chromeos.c
index ebbfdd3cb4..3d4f51cb21 100644
--- a/src/mainboard/google/peach_pit/chromeos.c
+++ b/src/mainboard/google/peach_pit/chromeos.c
@@ -37,3 +37,9 @@ int get_write_protect_state(void)
 {
 	return !gpio_get_value(GPIO_X30);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get_value(GPIO_X23);
+}
diff --git a/src/mainboard/google/poppy/chromeos.c b/src/mainboard/google/poppy/chromeos.c
index 5dd1e9877e..35a9323e16 100644
--- a/src/mainboard/google/poppy/chromeos.c
+++ b/src/mainboard/google/poppy/chromeos.c
@@ -38,3 +38,9 @@ void mainboard_chromeos_acpi_generate(void)
 	gpios = variant_cros_gpios(&num);
 	chromeos_acpi_gpio_generate(gpios, num);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/rambi/chromeos.c b/src/mainboard/google/rambi/chromeos.c
index f9a171820d..edc714eff5 100644
--- a/src/mainboard/google/rambi/chromeos.c
+++ b/src/mainboard/google/rambi/chromeos.c
@@ -8,6 +8,9 @@
 /* The WP status pin lives on GPIO_SSUS_6 which is pad 36 in the SUS well. */
 #define WP_STATUS_PAD	36
 
+/* The EC_IN_RW lives on SCGPIO59 */
+#define EC_IN_RW_PAD	59
+
 void fill_lb_gpios(struct lb_gpios *gpios)
 {
 	struct lb_gpio chromeos_gpios[] = {
@@ -43,3 +46,9 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !score_get_gpio(EC_IN_RW_PAD);
+}
diff --git a/src/mainboard/google/reef/chromeos.c b/src/mainboard/google/reef/chromeos.c
index 94d76b99e4..f87d9358e3 100644
--- a/src/mainboard/google/reef/chromeos.c
+++ b/src/mainboard/google/reef/chromeos.c
@@ -33,3 +33,9 @@ void mainboard_chromeos_acpi_generate(void)
 	gpios = variant_cros_gpios(&num);
 	chromeos_acpi_gpio_generate(gpios, num);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/sarien/chromeos.c b/src/mainboard/google/sarien/chromeos.c
index f49b63964f..36825b5dd7 100644
--- a/src/mainboard/google/sarien/chromeos.c
+++ b/src/mainboard/google/sarien/chromeos.c
@@ -107,3 +107,10 @@ void mainboard_prepare_cr50_reset(void)
 	if (ENV_RAMSTAGE)
 		pmc_soc_set_afterg3_en(true);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/slippy/chromeos.c b/src/mainboard/google/slippy/chromeos.c
index 4fffd45b35..11d41cd441 100644
--- a/src/mainboard/google/slippy/chromeos.c
+++ b/src/mainboard/google/slippy/chromeos.c
@@ -30,3 +30,9 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !get_gpio(14);
+}
diff --git a/src/mainboard/google/smaug/chromeos.c b/src/mainboard/google/smaug/chromeos.c
index 13a69bc0ed..d74df8267e 100644
--- a/src/mainboard/google/smaug/chromeos.c
+++ b/src/mainboard/google/smaug/chromeos.c
@@ -19,3 +19,9 @@ int get_write_protect_state(void)
 {
 	return !gpio_get(WRITE_PROTECT_L);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(EC_IN_RW);
+}
diff --git a/src/mainboard/google/storm/chromeos.c b/src/mainboard/google/storm/chromeos.c
index 21cf94f978..51a0c5c09e 100644
--- a/src/mainboard/google/storm/chromeos.c
+++ b/src/mainboard/google/storm/chromeos.c
@@ -128,3 +128,10 @@ int get_write_protect_state(void)
 {
 	return !read_gpio(WP_SW);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/trogdor/chromeos.c b/src/mainboard/google/trogdor/chromeos.c
index 9006000191..718df331f4 100644
--- a/src/mainboard/google/trogdor/chromeos.c
+++ b/src/mainboard/google/trogdor/chromeos.c
@@ -55,3 +55,9 @@ int tis_plat_irq_status(void)
 {
 	return gpio_irq_status(GPIO_H1_AP_INT);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. This is active low. */
+	return !!gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/veyron/chromeos.c b/src/mainboard/google/veyron/chromeos.c
index b99df04c14..411b14e1f7 100644
--- a/src/mainboard/google/veyron/chromeos.c
+++ b/src/mainboard/google/veyron/chromeos.c
@@ -56,3 +56,9 @@ int get_write_protect_state(void)
 {
 	return !gpio_get(GPIO_WP);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_ECINRW);
+}
diff --git a/src/mainboard/google/veyron_mickey/chromeos.c b/src/mainboard/google/veyron_mickey/chromeos.c
index a3ba7529ba..f3587a3eed 100644
--- a/src/mainboard/google/veyron_mickey/chromeos.c
+++ b/src/mainboard/google/veyron_mickey/chromeos.c
@@ -34,3 +34,10 @@ int get_write_protect_state(void)
 {
 	return !gpio_get(GPIO_WP);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/veyron_rialto/chromeos.c b/src/mainboard/google/veyron_rialto/chromeos.c
index 95158bf9ee..33f0ee45fc 100644
--- a/src/mainboard/google/veyron_rialto/chromeos.c
+++ b/src/mainboard/google/veyron_rialto/chromeos.c
@@ -43,3 +43,10 @@ int get_write_protect_state(void)
 {
 	return !gpio_get(GPIO_WP);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* Do not have a Chrome EC involved in entering recovery mode;
+	   Always return trusted. */
+	return 1;
+}
diff --git a/src/mainboard/google/volteer/chromeos.c b/src/mainboard/google/volteer/chromeos.c
index abd50c57ba..cdf418d394 100644
--- a/src/mainboard/google/volteer/chromeos.c
+++ b/src/mainboard/google/volteer/chromeos.c
@@ -32,3 +32,9 @@ void mainboard_chromeos_acpi_generate(void)
 	gpios = variant_cros_gpios(&num);
 	chromeos_acpi_gpio_generate(gpios, num);
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}
diff --git a/src/mainboard/google/zork/chromeos.c b/src/mainboard/google/zork/chromeos.c
index b581b90d1a..3c60f9816e 100644
--- a/src/mainboard/google/zork/chromeos.c
+++ b/src/mainboard/google/zork/chromeos.c
@@ -31,3 +31,9 @@ void mainboard_chromeos_acpi_generate(void)
 {
 	chromeos_acpi_gpio_generate(cros_gpios, ARRAY_SIZE(cros_gpios));
 }
+
+int get_ec_is_trusted(void)
+{
+	/* EC is trusted if not in RW. */
+	return !gpio_get(GPIO_EC_IN_RW);
+}