pmic.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <delay.h>
#include <device/i2c_simple.h>
#include <reset.h>
#include <stdint.h>
 
#include "pmic.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 void pmic_write_reg(unsigned int 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 board on any PMIC write error */
                board_reset();
        } else {
                if (delay)
                        udelay(500);
        }
}
 
void pmic_write_reg_77620(unsigned int 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 int bus, uint8_t reg, uint8_t val,
                                        int delay)
{
        pmic_write_reg(bus, MAX77621_CPU_I2C_ADDR, reg, val, delay);
}
 
void pmic_init(unsigned int 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");
}