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/*
* This file is part of the coreboot project.
*
* Copyright 2015 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,
MAX77621_CPU_I2C_ADDR = 0x1B,
MAX77621_GPU_I2C_ADDR = 0x1C,
};
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 chip, uint8_t reg, uint8_t val,
int delay)
{
if (i2c_writeb(bus, chip, 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);
}
}
void pmic_write_reg_77620(unsigned bus, uint8_t reg, uint8_t val,
int delay)
{
pmic_write_reg(bus, MAX77620_I2C_ADDR, reg, val, delay);
}
static inline void pmic_write_reg_77621(unsigned bus, uint8_t reg, uint8_t val,
int delay)
{
pmic_write_reg(bus, MAX77621_CPU_I2C_ADDR, reg, val, delay);
}
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_77620(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);
/* MAX77620: Set SD0 to 1.0V - VDD_CORE */
pmic_write_reg_77620(bus, MAX77620_SD0_REG, 0x20, 1);
pmic_write_reg_77620(bus, MAX77620_VDVSSD0_REG, 0x20, 1);
/* MAX77620: GPIO 0,1,2,5,6,7 = GPIO, 3,4 = alt mode */
pmic_write_reg_77620(bus, MAX77620_AME_GPIO, 0x18, 1);
/* MAX77620: Disable SD1 Remote Sense, Set SD1 for LPDDR4 to 1.125V */
pmic_write_reg_77620(bus, MAX77620_CNFG2SD_REG, 0x04, 1);
pmic_write_reg_77620(bus, MAX77620_SD1_REG, 0x2a, 1);
/*
* MAX77620: Set LDO2 output to 1.8V. LDO2 is used as always-on
* reference for the droop alert circuit. Match this setting with what
* the kernel expects.
*/
pmic_write_reg_77620(bus, MAX77620_CNFG1_L2_REG, 0x14, 1);
/* MAX77621: Set VOUT_REG to 1.0V - CPU VREG */
pmic_write_reg_77621(bus, MAX77621_VOUT_REG, 0xBF, 1);
/* MAX77621: Set VOUT_DVC_REG to 1.0V - CPU VREG DVC */
pmic_write_reg_77621(bus, MAX77621_VOUT_DVC_REG, 0xBF, 1);
/* MAX77621: Set CONTROL1 to 0x38 */
pmic_write_reg_77621(bus, MAX77621_CONTROL1_REG, 0x38, 1);
/* MAX77621: Set CONTROL2 to 0xD2 */
pmic_write_reg_77621(bus, MAX77621_CONTROL2_REG, 0xD2, 1);
/* MAX77620: Setup/Enable GPIO5 - EN_VDD_CPU */
pmic_write_reg_77620(bus, MAX77620_GPIO5_REG, 0x09, 1);
/* Required delay of 2msec */
udelay(2000);
printk(BIOS_DEBUG, "PMIC init done\n");
}
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