ec/starlabs/merlin: Add support for enabling the mirror flag

When enabled, the EC will mirror the firmware contained inside the
coreboot ROM. This allows it to be updated at the same time as
coreboot.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: Ief088e012b65be32648f581fc3190e1000bca241
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68938
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

12 files changed, 40 insertions, 1 deletions

diff --git a/src/ec/starlabs/merlin/Kconfig b/src/ec/starlabs/merlin/Kconfig
index 6ccd21791c..203fd4884b 100644
--- a/src/ec/starlabs/merlin/Kconfig
+++ b/src/ec/starlabs/merlin/Kconfig
@@ -64,6 +64,13 @@ config EC_STARLABS_MAX_CHARGE
 	help
 	  Select if the mainboard supports limiting the maximum charge of the battery.
 
+config EC_STARLABS_MIRROR_FLAG
+	bool
+	default n
+	depends on EC_STARLABS_ITE
+	help
+	  Select if the EC should mirror the EC firmware contained in the coreboot ROM.
+
 config EC_STARLABS_MERLIN
 	bool "Use open-source Merlin EC Firmware"
 	default n
diff --git a/src/ec/starlabs/merlin/ec.h b/src/ec/starlabs/merlin/ec.h
index ca1d081f0c..ff01c89679 100644
--- a/src/ec/starlabs/merlin/ec.h
+++ b/src/ec/starlabs/merlin/ec.h
@@ -98,6 +98,10 @@
 #define KBL_DISABLED		0x00
 #define KBL_ENABLED		0xdd
 
+/* Mirror Flag */
+#define MIRROR_DISABLED		0x00
+#define MIRROR_ENABLED		0x01
+
 uint16_t ec_get_version(void);
 
 #endif
diff --git a/src/ec/starlabs/merlin/ite.c b/src/ec/starlabs/merlin/ite.c
index 357c67cda5..d2d7c454d3 100644
--- a/src/ec/starlabs/merlin/ite.c
+++ b/src/ec/starlabs/merlin/ite.c
@@ -70,6 +70,7 @@ static void merlin_init(struct device *dev)
 	 * trackpad_state
 	 * kbl_brightness
 	 * kbl_state
+	 * mirror_flag
 	 */
 
 	/*
@@ -247,6 +248,25 @@ static void merlin_init(struct device *dev)
 					 1,
 					 kbl_state,
 					 ARRAY_SIZE(kbl_state)));
+
+	/*
+	 * Mirror Flag
+	 *
+	 * Setting:	mirror_flag
+	 *
+	 * Values:	Off, On
+	 * Default:	On
+	 */
+	const uint8_t mirror_flag[] = {
+		MIRROR_DISABLED,
+		MIRROR_ENABLED
+	};
+	if (CONFIG(EC_STARLABS_MIRROR_FLAG))
+		ec_write(ECRAM_MIRROR_FLAG,
+			get_ec_value_from_option("mirror_flag",
+						1,
+						mirror_flag,
+						ARRAY_SIZE(mirror_flag)));
 }
 
 static struct device_operations ops = {
diff --git a/src/ec/starlabs/merlin/variants/adl/ecdefs.h b/src/ec/starlabs/merlin/variants/adl/ecdefs.h
index 28f7e4b84f..18480e2a9d 100644
--- a/src/ec/starlabs/merlin/variants/adl/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/adl/ecdefs.h
@@ -23,5 +23,5 @@
 #define ECRAM_MAX_CHARGE	0x1a
 #define ECRAM_FAN_MODE		0x1b
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
-
+#define ECRAM_MIRROR_FLAG	0x05
 #endif
diff --git a/src/ec/starlabs/merlin/variants/apl/ecdefs.h b/src/ec/starlabs/merlin/variants/apl/ecdefs.h
index fa7e79b148..5cbe14e36d 100644
--- a/src/ec/starlabs/merlin/variants/apl/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/apl/ecdefs.h
@@ -23,5 +23,6 @@
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
 #define ECRAM_FAN_MODE		dead_code_t(uint8_t)
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
+#define ECRAM_MIRROR_FLAG	0x04
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h b/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h
index 6a3bad9286..0826456979 100644
--- a/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h
@@ -23,5 +23,6 @@
 #define ECRAM_MAX_CHARGE	0x23
 #define ECRAM_FAN_MODE		0x24
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
+#define ECRAM_MIRROR_FLAG	0x05
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/cml/ecdefs.h b/src/ec/starlabs/merlin/variants/cml/ecdefs.h
index 6a24bc4deb..0a2654bf8f 100644
--- a/src/ec/starlabs/merlin/variants/cml/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/cml/ecdefs.h
@@ -23,5 +23,6 @@
 #define ECRAM_KBL_BRIGHTNESS	0x19
 #define ECRAM_FN_LOCK_STATE	0x2c
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
+#define ECRAM_MIRROR_FLAG	0x04
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/glk/ecdefs.h b/src/ec/starlabs/merlin/variants/glk/ecdefs.h
index fefdd141c9..b2e2f2f8ab 100644
--- a/src/ec/starlabs/merlin/variants/glk/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/glk/ecdefs.h
@@ -23,5 +23,6 @@
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
 #define ECRAM_FAN_MODE		dead_code_t(uint8_t)
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
+#define ECRAM_MIRROR_FLAG	0x04
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/glkr/ecdefs.h b/src/ec/starlabs/merlin/variants/glkr/ecdefs.h
index 038c378fb2..ecc117c990 100644
--- a/src/ec/starlabs/merlin/variants/glkr/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/glkr/ecdefs.h
@@ -23,5 +23,6 @@
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
 #define ECRAM_FAN_MODE		dead_code_t(uint8_t)
 #define ECRAM_FAST_CHARGE       0x18
+#define ECRAM_MIRROR_FLAG	dead_code_t(uint8_t)
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/kbl/ecdefs.h b/src/ec/starlabs/merlin/variants/kbl/ecdefs.h
index 3b693173af..8f3355dd0a 100644
--- a/src/ec/starlabs/merlin/variants/kbl/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/kbl/ecdefs.h
@@ -23,5 +23,6 @@
 #define ECRAM_FN_CTRL_REVERSE	0x43
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
+#define ECRAM_MIRROR_FLAG	0x04
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/merlin/ecdefs.h b/src/ec/starlabs/merlin/variants/merlin/ecdefs.h
index f02c73a27c..08f80cb1f8 100644
--- a/src/ec/starlabs/merlin/variants/merlin/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/merlin/ecdefs.h
@@ -20,5 +20,6 @@
 #define ECRAM_FAN_MODE		0x50
 #define ECRAM_MAX_CHARGE	0x51
 #define ECRAM_FAST_CHARGE       0x52
+#define ECRAM_MIRROR_FLAG	0x05
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/tgl/ecdefs.h b/src/ec/starlabs/merlin/variants/tgl/ecdefs.h
index cbc7b86e10..c17b02542b 100644
--- a/src/ec/starlabs/merlin/variants/tgl/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/tgl/ecdefs.h
@@ -23,5 +23,6 @@
 #define ECRAM_MAX_CHARGE	0x1a
 #define ECRAM_FAN_MODE		0x1b
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
+#define ECRAM_MIRROR_FLAG	0x05
 
 #endif