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, 87 insertions, 0 deletions

diff --git a/src/drivers/i2c/nct7802y/nct7802y_peci.c b/src/drivers/i2c/nct7802y/nct7802y_peci.c
new file mode 100644
index 0000000000..26e62a3f09
--- /dev/null
+++ b/src/drivers/i2c/nct7802y/nct7802y_peci.c
@@ -0,0 +1,87 @@
+/*
+ * 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.
+ */
+
+#include <types.h>
+#include <device/device.h>
+
+#include "nct7802y.h"
+#include "chip.h"
+
+void nct7802y_init_peci(struct device *const dev)
+{
+	const struct drivers_i2c_nct7802y_config *const config = dev->chip_info;
+	unsigned int i, all_off = 1;
+
+	/* Bank 1 can only be written to if PECI reading is enabled */
+	if (nct7802y_select_bank(dev, 0) != CB_SUCCESS)
+		return;
+	nct7802y_update(dev, PECI_ENABLE, 0, PECI_ENABLE_AGENTx(0));
+
+	if (nct7802y_select_bank(dev, 1) != CB_SUCCESS)
+		return;
+
+	for (i = 0; i < NCT7802Y_PECI_CNT; ++i) {
+		if (config->peci[i].mode != PECI_DISABLED) {
+			u8 ctrl3 = 0, style = 0;
+			switch (config->peci[i].mode) {
+			case PECI_DOMAIN_0:
+				ctrl3 = PECI_CTRL_3_EN_AGENTx(i);
+				style = PECI_TEMP_STYLE_DOM0_AGENTx(i) |
+					PECI_TEMP_STYLE_SINGLE;
+				break;
+			case PECI_DOMAIN_1:
+				ctrl3 = PECI_CTRL_3_EN_AGENTx(i) |
+					PECI_CTRL_3_HAS_DOM1_AGENTx(i);
+				style = PECI_TEMP_STYLE_DOM1_AGENTx(i) |
+					PECI_TEMP_STYLE_SINGLE;
+				break;
+			case PECI_HIGHEST:
+				ctrl3 = PECI_CTRL_3_EN_AGENTx(i) |
+					PECI_CTRL_3_HAS_DOM1_AGENTx(i);
+				style = PECI_TEMP_STYLE_HIGHEST;
+				break;
+			default:
+				break;
+			}
+			nct7802y_update(dev, PECI_CTRL_1,
+					PECI_CTRL_1_MANUAL_EN,
+					PECI_CTRL_1_EN |
+						PECI_CTRL_1_ROUTINE_EN);
+			nct7802y_update(dev, PECI_CTRL_3,
+					PECI_CTRL_3_HAS_DOM1_AGENTx(i), ctrl3);
+			nct7802y_update(dev, PECI_REPORT_TEMP_STYLE,
+					PECI_TEMP_STYLE_DOM1_AGENTx(i) |
+						PECI_TEMP_STYLE_HIGHEST,
+					style);
+			nct7802y_write(dev, PECI_BASE_TEMP_AGENT(i),
+				       config->peci[i].base_temp);
+			all_off = 0;
+		} else {
+			nct7802y_update(dev, PECI_CTRL_3,
+					PECI_CTRL_3_EN_AGENTx(i), 0);
+		}
+	}
+
+	if (all_off)
+		nct7802y_update(dev, PECI_CTRL_1, PECI_CTRL_1_EN, 0);
+
+	/* Disable PECI #0 reading if we only enabled it to access bank 1 */
+	if (config->peci[0].mode == PECI_DISABLED) {
+		if (nct7802y_select_bank(dev, 0) != CB_SUCCESS)
+			return;
+
+		nct7802y_update(dev, PECI_ENABLE, PECI_ENABLE_AGENTx(0), 0);
+	}
+}