src/mainboard/google/rush/pmic.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright 2014 Google Inc.
 * Copyright (c) 2013, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <console/console.h>
#include <delay.h>
#include <device/i2c.h>
#include <stdint.h>
#include <stdlib.h>

#include <boardid.h>
#include "pmic.h"
#include "reset.h"

enum {
	AS3722_I2C_ADDR = 0x40
};

struct as3722_init_reg {
	u8 reg;
	u8 val;
	u8 delay;
};

static struct as3722_init_reg init_list[] = {
	{AS3722_SDO0, 0x3C, 1},
	{AS3722_SDO1, 0x32, 0},
	{AS3722_LDO3, 0x59, 0},
	{AS3722_SDO2, 0x3C, 0},
	{AS3722_SDO3, 0x00, 0},
	{AS3722_SDO4, 0x00, 0},
	{AS3722_SDO5, 0x50, 0},
	{AS3722_SDO6, 0x28, 1},
	{AS3722_LDO0, 0x8A, 0},
	{AS3722_LDO1, 0x00, 0},
	{AS3722_LDO2, 0x10, 0},
	{AS3722_LDO4, 0x00, 0},
	{AS3722_LDO5, 0x00, 0},
	{AS3722_LDO6, 0x00, 0},
	{AS3722_LDO7, 0x00, 0},
	{AS3722_LDO9, 0x00, 0},
	{AS3722_LDO10, 0x00, 0},
	{AS3722_LDO11, 0x00, 1},
};

static void pmic_write_reg(unsigned bus, uint8_t reg, uint8_t val, int delay)
{
	if (i2c_writeb(bus, AS3722_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 as3722_init_reg *reg = &init_list[i];
		pmic_write_reg(bus, reg->reg, reg->val, reg->delay);
	}
}

void pmic_init(unsigned bus)
{
	/*
	 * Don't need to set up VDD_CORE - already done - by OTP
	 * Don't write SDCONTROL - it's already 0x7F, i.e. all SDs enabled.
	 * Don't write LDCONTROL - it's already 0xFF, i.e. all LDOs enabled.
	 */

	/* Restore PMIC POR defaults, in case kernel changed 'em */
	pmic_slam_defaults(bus);

	/* SDO0: Set VDD_CPU to 1.2V. */
	pmic_write_reg(bus, 0x00, 0x50, 1);

	/* SDO6: Set VDD_GPU to 1.0V. */
	pmic_write_reg(bus, 0x06, 0x28, 1);

	/* LDO2: Set +1.2V_GEN_AVDD to 1.2V */
	pmic_write_reg(bus, 0x12, 0x10, 1);

	/*
	 * Panel power GPIO O4. Set mode for GPIO4 (0x0c to 7), then set
	 * the value (register 0x20 bit 4)
	 */
	pmic_write_reg(bus, 0x0c, 0x07, 0);
	pmic_write_reg(bus, 0x20, 0x10, 1);

	printk(BIOS_DEBUG, "PMIC init done\n");
}