drivers/i2c/nct7802y: Add new hardware-monitoring IC

Just another hardware-monitoring chip. Only limited fan control and PECI
configuration is implemented.

Change-Id: I35ea79e12941804e398c6304a08170a776f4ca76
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/29475
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

1 files changed, 96 insertions, 0 deletions

diff --git a/src/drivers/i2c/nct7802y/chip.h b/src/drivers/i2c/nct7802y/chip.h
new file mode 100644
index 0000000000..11db12be35
--- /dev/null
+++ b/src/drivers/i2c/nct7802y/chip.h
@@ -0,0 +1,96 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2017 secunet Security Networks AG
+ *
+ * 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.
+ */
+
+#ifndef DRIVERS_I2C_NCT7802Y_CHIP_H
+#define DRIVERS_I2C_NCT7802Y_CHIP_H
+
+#include <stdint.h>
+
+#define NCT7802Y_PECI_CNT	2
+#define NCT7802Y_FAN_CNT	3
+
+enum nct7802y_peci_mode {
+	PECI_DISABLED = 0,
+	PECI_DOMAIN_0,
+	PECI_DOMAIN_1,
+	PECI_HIGHEST,
+};
+
+struct nct7802y_peci_config {
+	enum nct7802y_peci_mode mode;
+	u8 base_temp;
+};
+
+enum nct7802y_fan_mode {
+	FAN_IGNORE = 0,
+	FAN_MANUAL,
+	FAN_SMART,
+};
+
+enum nct7802y_fan_smartmode {
+	SMART_FAN_DUTY = 0,	/* Target values given in duty cycle %. */
+	SMART_FAN_RPM,		/* Target valuse given in RPM. */
+};
+
+enum nct7802y_fan_speed {
+	FAN_SPEED_NORMAL = 0,	/* RPM values <= 12,750. */
+	FAN_SPPED_HIGHSPEED,	/* RPM values <= 25,500. */
+};
+
+enum nct7802y_fan_pecierror {
+	PECI_ERROR_KEEP = 0,	/* Keep current value. */
+	PECI_ERROR_VALUE,	/* Use `pecierror_minduty`. */
+	PECI_ERROR_FULLSPEED,	/* Run PWM at 100% duty cycle. */
+};
+
+enum nct7802y_temp_source {
+	TEMP_SOURCE_REMOTE_1 = 0,
+	TEMP_SOURCE_REMOTE_2,
+	TEMP_SOURCE_REMOTE_3,
+	TEMP_SOURCE_LOCAL,
+	TEMP_SOURCE_PECI_0,
+	TEMP_SOURCE_PECI_1,
+	TEMP_SOURCE_PROGRAMMABLE_0,
+	TEMP_SOURCE_PROGRAMMABLE_1,
+};
+
+struct nct7802y_fan_smartconfig {
+	enum nct7802y_fan_smartmode mode;
+	enum nct7802y_fan_speed speed;
+	enum nct7802y_temp_source tempsrc;
+	struct {
+		u8 temp;
+		u16 target;
+	} table[4];
+	u8 critical_temp;
+};
+
+struct nct7802y_fan_config {
+	enum nct7802y_fan_mode mode;
+	union {
+		u8 duty_cycle;
+		struct nct7802y_fan_smartconfig smart;
+	};
+};
+
+/* Implements only those parts currently used by coreboot mainboards. */
+struct drivers_i2c_nct7802y_config {
+	struct nct7802y_peci_config peci[NCT7802Y_PECI_CNT];
+	struct nct7802y_fan_config fan[NCT7802Y_FAN_CNT];
+	enum nct7802y_fan_pecierror on_pecierror;
+	u8 pecierror_minduty;
+};
+
+#endif /* DRIVERS_I2C_NCT7802Y_CHIP_H */