ec/starlabs/merlin: Add support for enabling fast charge

The Lite Mk IV's can enable fast charging, with support up to 100W
via USB-C PD 3.0.

The default for this is disabled, as it can reduce battery life
span. This patch adds the option to enable fast charging, by
writing 0x01 to 0x18 in the EC space.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: Ie01eb59d3f41b242190973fd9c58b1494320c12a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66298
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

12 files changed, 50 insertions, 0 deletions

diff --git a/src/ec/starlabs/merlin/Kconfig b/src/ec/starlabs/merlin/Kconfig
index ff6077a806..6ccd21791c 100644
--- a/src/ec/starlabs/merlin/Kconfig
+++ b/src/ec/starlabs/merlin/Kconfig
@@ -50,6 +50,13 @@ config EC_STARLABS_FAN
 	help
 	  Select if the mainboard has a fan.
 
+config EC_STARLABS_FAST_CHARGE
+	bool
+	default n
+	depends on EC_STARLABS_NUVOTON
+	help
+	  Select if the mainboard supports fast charging.
+
 config EC_STARLABS_MAX_CHARGE
 	bool
 	default n
diff --git a/src/ec/starlabs/merlin/ec.h b/src/ec/starlabs/merlin/ec.h
index 6a6cda5ee1..ca1d081f0c 100644
--- a/src/ec/starlabs/merlin/ec.h
+++ b/src/ec/starlabs/merlin/ec.h
@@ -71,6 +71,10 @@
 #define CHARGE_80		0xbb
 #define CHARGE_60		0xaa
 
+/* Fast Charge Setting */
+#define CHARGE_RATE_NORMAL	0x00
+#define CHARGE_RATE_FAST	0x01
+
 /* Fan Mode Setting */
 #define FAN_NORMAL		0x00
 #define FAN_AGGRESSIVE		0xbb
diff --git a/src/ec/starlabs/merlin/nuvoton.c b/src/ec/starlabs/merlin/nuvoton.c
index ee8a66176f..e62f3dcb53 100644
--- a/src/ec/starlabs/merlin/nuvoton.c
+++ b/src/ec/starlabs/merlin/nuvoton.c
@@ -137,6 +137,27 @@ static void merlin_init(struct device *dev)
 						 ARRAY_SIZE(max_charge)));
 
 	/*
+	 * Fast Charge
+	 *
+	 * Setting:	fast_charge
+	 *
+	 * Values:	Normal, Fast
+	 * Default:	Normal
+	 *
+	 */
+	const uint8_t fast_charge[] = {
+		CHARGE_RATE_NORMAL,
+		CHARGE_RATE_FAST
+	};
+
+	if (CONFIG(EC_STARLABS_FAST_CHARGE))
+		ec_write(ECRAM_FAST_CHARGE,
+			get_ec_value_from_option("fast_charge",
+						 0,
+						 fast_charge,
+						 ARRAY_SIZE(fast_charge)));
+
+	/*
 	 * Fan Mode
 	 *
 	 * Setting:	fan_mode
diff --git a/src/ec/starlabs/merlin/variants/apl/ecdefs.h b/src/ec/starlabs/merlin/variants/apl/ecdefs.h
index bb791bc9dc..fa7e79b148 100644
--- a/src/ec/starlabs/merlin/variants/apl/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/apl/ecdefs.h
@@ -22,5 +22,6 @@
 #define ECRAM_FN_CTRL_REVERSE	0x2d
 #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)
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h b/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h
index a75720e34e..6a3bad9286 100644
--- a/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h
@@ -1,5 +1,8 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <assert.h>
+#include <stdint.h>
+
 /*
  * EC communication interface for ITE Embedded Controller
  */
@@ -19,5 +22,6 @@
 #define ECRAM_FN_CTRL_REVERSE	0x22
 #define ECRAM_MAX_CHARGE	0x23
 #define ECRAM_FAN_MODE		0x24
+#define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/cml/ecdefs.h b/src/ec/starlabs/merlin/variants/cml/ecdefs.h
index 78c032997a..6a24bc4deb 100644
--- a/src/ec/starlabs/merlin/variants/cml/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/cml/ecdefs.h
@@ -1,5 +1,8 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <assert.h>
+#include <stdint.h>
+
 /*
  * EC communication interface for ITE Embedded Controller
  */
@@ -19,5 +22,6 @@
 #define ECRAM_KBL_STATE		0x18
 #define ECRAM_KBL_BRIGHTNESS	0x19
 #define ECRAM_FN_LOCK_STATE	0x2c
+#define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/glk/ecdefs.h b/src/ec/starlabs/merlin/variants/glk/ecdefs.h
index 7407267041..fefdd141c9 100644
--- a/src/ec/starlabs/merlin/variants/glk/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/glk/ecdefs.h
@@ -22,5 +22,6 @@
 #define ECRAM_FN_CTRL_REVERSE	0x2d
 #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)
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/glkr/ecdefs.h b/src/ec/starlabs/merlin/variants/glkr/ecdefs.h
index 51b34dfd3e..038c378fb2 100644
--- a/src/ec/starlabs/merlin/variants/glkr/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/glkr/ecdefs.h
@@ -22,5 +22,6 @@
 #define ECRAM_FN_CTRL_REVERSE	0x13
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
 #define ECRAM_FAN_MODE		dead_code_t(uint8_t)
+#define ECRAM_FAST_CHARGE       0x18
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/glkr/emem.asl b/src/ec/starlabs/merlin/variants/glkr/emem.asl
index 4f7c10053b..6fa827eea8 100644
--- a/src/ec/starlabs/merlin/variants/glkr/emem.asl
+++ b/src/ec/starlabs/merlin/variants/glkr/emem.asl
@@ -26,6 +26,7 @@ Field (ECF2, ByteAcc, Lock, Preserve)
 	FLKE, 8,	// Function Lock State
 	KLSE, 8,	// Keyboard Backlight State
 	KLBE, 8,	// Keyboard Backlight Brightness
+	FSCH, 8,	// Fast Charge
 
 	Offset(0x20),
 	RCMD, 8,	// Send EC command
diff --git a/src/ec/starlabs/merlin/variants/kbl/ecdefs.h b/src/ec/starlabs/merlin/variants/kbl/ecdefs.h
index a9dda92716..3b693173af 100644
--- a/src/ec/starlabs/merlin/variants/kbl/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/kbl/ecdefs.h
@@ -22,5 +22,6 @@
 #define ECRAM_FAN_MODE		0x42
 #define ECRAM_FN_CTRL_REVERSE	0x43
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
+#define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/merlin/ecdefs.h b/src/ec/starlabs/merlin/variants/merlin/ecdefs.h
index 48357d964a..f02c73a27c 100644
--- a/src/ec/starlabs/merlin/variants/merlin/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/merlin/ecdefs.h
@@ -19,5 +19,6 @@
 #define ECRAM_KBL_TIMEOUT	0x35
 #define ECRAM_FAN_MODE		0x50
 #define ECRAM_MAX_CHARGE	0x51
+#define ECRAM_FAST_CHARGE       0x52
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/tgl/ecdefs.h b/src/ec/starlabs/merlin/variants/tgl/ecdefs.h
index 3441bc073f..cbc7b86e10 100644
--- a/src/ec/starlabs/merlin/variants/tgl/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/tgl/ecdefs.h
@@ -1,5 +1,8 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <assert.h>
+#include <stdint.h>
+
 /*
  * EC communication interface for ITE Embedded Controller
  */
@@ -19,5 +22,6 @@
 #define ECRAM_FN_CTRL_REVERSE	0x17
 #define ECRAM_MAX_CHARGE	0x1a
 #define ECRAM_FAN_MODE		0x1b
+#define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
 
 #endif