1 files changed, 93 insertions, 0 deletions
diff --git a/src/mainboard/google/foster/pmic.c b/src/mainboard/google/foster/pmic.c
new file mode 100644
index 0000000000..b549107059
--- /dev/null
+++ b/src/mainboard/google/foster/pmic.c
@@ -0,0 +1,93 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ * Copyright (c) 2013-2015, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+#include <boardid.h>
+#include <console/console.h>
+#include <delay.h>
+#include <device/i2c.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "pmic.h"
+#include "reset.h"
+
+enum {
+	MAX77620_I2C_ADDR = 0x3c
+};
+
+struct max77620_init_reg {
+	u8 reg;
+	u8 val;
+	u8 delay;
+};
+
+static struct max77620_init_reg init_list[] = {
+	/* TODO */
+};
+
+static void pmic_write_reg(unsigned bus, uint8_t reg, uint8_t val, int delay)
+{
+	if (i2c_writeb(bus, MAX77620_I2C_ADDR, reg, val)) {
+		printk(BIOS_ERR, "%s: reg = 0x%02X, value = 0x%02X failed!\n",
+			__func__, reg, val);
+		/* Reset the SoC on any PMIC write error */
+		cpu_reset();
+	} else {
+		if (delay)
+			udelay(500);
+	}
+}
+
+static void pmic_slam_defaults(unsigned bus)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(init_list); i++) {
+		struct max77620_init_reg *reg = &init_list[i];
+		pmic_write_reg(bus, reg->reg, reg->val, reg->delay);
+	}
+}
+
+void pmic_init(unsigned bus)
+{
+	/* Restore PMIC POR defaults, in case kernel changed 'em */
+	pmic_slam_defaults(bus);
+
+	/* Setup/Enable GPIO5 - VDD_CPU_REG_EN */
+	pmic_write_reg(bus, MAX77620_GPIO5_REG, 0x09, 1);
+
+	/* Setup/Enable GPIO1 - VDD_HDMI_5V0_BST_EN -- ??? */
+	pmic_write_reg(bus, MAX77620_GPIO1_REG, 0x09, 1);
+
+	/* GPIO 0,1,5,6,7 = GPIO, 2,3,4 = alt mode */
+	pmic_write_reg(bus, MAX77620_AME_GPIO, 0x1c, 1);
+
+	/* Disable SD1 Remote Sense, Set SD1 for LPDDR4 to 1.125v? */
+	pmic_write_reg(bus, MAX77620_CNFG2SD_REG, 0x04, 1);
+
+	pmic_write_reg(bus, MAX77620_SD1_REG, 0x2a, 1);
+
+	/* CNFG1_L2 = 0xF2 for 3.3v, enabled */
+	pmic_write_reg(bus, MAX77620_CNFG1_L2_REG, 0xf2, 1);
+
+	/* CNFG1_L1 = 0xCA for 1.05v, enabled */
+	pmic_write_reg(bus, MAX77620_CNFG1_L1_REG, 0xca, 1);
+
+	printk(BIOS_DEBUG, "PMIC init done\n");
+}