max77686.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <console/console.h>
#include <device/mmio.h>
#include <device/i2c_simple.h>
 
#include "max77686.h"
 
/* Chip register numbers (not exported from this module) */
enum {
        REG_BBAT                = 0x7e,
 
        /* Bits for BBAT */
        BBAT_BBCHOSTEN_MASK     = 1 << 0,
        BBAT_BBCVS_SHIFT        = 3,
        BBAT_BBCVS_MASK         = 3 << BBAT_BBCVS_SHIFT,
};
 
/*
 * Max77686 parameters values
 * see max77686.h for parameters details
 */
struct max77686_para max77686_param[] = {/*{vol_addr, vol_bitpos,
        vol_bitmask, reg_enaddr, reg_enbitpos, reg_enbitmask, reg_enbiton,
        reg_enbitoff, vol_min, vol_div}*/
        {/* PMIC_BUCK1 */ 0x11, 0x0, 0x3F, 0x10, 0x0, 0x3, 0x3, 0x0, 750, 50000},
        {/* PMIC_BUCK2 */ 0x14, 0x0, 0xFF, 0x12, 0x4, 0x3, 0x1, 0x0, 600, 12500},
        {/* PMIC_BUCK3 */ 0x1E, 0x0, 0xFF, 0x1C, 0x4, 0x3, 0x1, 0x0, 600, 12500},
        {/* PMIC_BUCK4 */ 0x28, 0x0, 0xFF, 0x26, 0x4, 0x3, 0x1, 0x0, 600, 12500},
        {/* PMIC_BUCK5 */ 0x31, 0x0, 0x3F, 0x30, 0x0, 0x3, 0x3, 0x0, 750, 50000},
        {/* PMIC_BUCK6 */ 0x33, 0x0, 0x3F, 0x32, 0x0, 0x3, 0x3, 0x0, 750, 50000},
        {/* PMIC_BUCK7 */ 0x35, 0x0, 0x3F, 0x34, 0x0, 0x3, 0x3, 0x0, 750, 50000},
        {/* PMIC_BUCK8 */ 0x37, 0x0, 0x3F, 0x36, 0x0, 0x3, 0x3, 0x0, 750, 50000},
        {/* PMIC_BUCK9 */ 0x39, 0x0, 0x3F, 0x38, 0x0, 0x3, 0x3, 0x0, 750, 50000},
        {/* PMIC_LDO1 */  0x40, 0x0, 0x3F, 0x40, 0x6, 0x3, 0x3, 0x0, 800, 25000},
        {/* PMIC_LDO2 */  0x41, 0x0, 0x3F, 0x41, 0x6, 0x3, 0x1, 0x0, 800, 25000},
        {/* PMIC_LDO3 */  0x42, 0x0, 0x3F, 0x42, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO4 */  0x43, 0x0, 0x3F, 0x43, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO5 */  0x44, 0x0, 0x3F, 0x44, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO6 */  0x45, 0x0, 0x3F, 0x45, 0x6, 0x3, 0x1, 0x0, 800, 25000},
        {/* PMIC_LDO7 */  0x46, 0x0, 0x3F, 0x46, 0x6, 0x3, 0x1, 0x0, 800, 25000},
        {/* PMIC_LDO8 */  0x47, 0x0, 0x3F, 0x47, 0x6, 0x3, 0x1, 0x0, 800, 25000},
        {/* PMIC_LDO9 */  0x48, 0x0, 0x3F, 0x48, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO10 */ 0x49, 0x0, 0x3F, 0x49, 0x6, 0x3, 0x1, 0x0, 800, 50000},
        {/* PMIC_LDO11 */ 0x4A, 0x0, 0x3F, 0x4A, 0x6, 0x3, 0x1, 0x0, 800, 50000},
        {/* PMIC_LDO12 */ 0x4B, 0x0, 0x3F, 0x4B, 0x6, 0x3, 0x1, 0x0, 800, 50000},
        {/* PMIC_LDO13 */ 0x4C, 0x0, 0x3F, 0x4C, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO14 */ 0x4D, 0x0, 0x3F, 0x4D, 0x6, 0x3, 0x1, 0x0, 800, 50000},
        {/* PMIC_LDO15 */ 0x4E, 0x0, 0x3F, 0x4E, 0x6, 0x3, 0x1, 0x0, 800, 25000},
        {/* PMIC_LDO16 */ 0x4F, 0x0, 0x3F, 0x4F, 0x6, 0x3, 0x1, 0x0, 800, 50000},
        {/* PMIC_LDO17 */ 0x50, 0x0, 0x3F, 0x50, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO18 */ 0x51, 0x0, 0x3F, 0x51, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO19 */ 0x52, 0x0, 0x3F, 0x52, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO20 */ 0x53, 0x0, 0x3F, 0x53, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO21 */ 0x54, 0x0, 0x3F, 0x54, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO22 */ 0x55, 0x0, 0x3F, 0x55, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO23 */ 0x56, 0x0, 0x3F, 0x56, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO24 */ 0x57, 0x0, 0x3F, 0x57, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO25 */ 0x58, 0x0, 0x3F, 0x58, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_LDO26 */ 0x59, 0x0, 0x3F, 0x59, 0x6, 0x3, 0x3, 0x0, 800, 50000},
        {/* PMIC_EN32KHZ_CP */ 0x0, 0x0, 0x0, 0x7F, 0x1, 0x1, 0x1, 0x0, 0x0, 0x0},
};
 
/*
 * Write a value to a register
 *
 * @param chip_addr     i2c addr for max77686
 * @param reg           reg number to write
 * @param val           value to be written
 *
 */
static inline int max77686_i2c_write(unsigned int bus, unsigned char chip_addr,
                                        unsigned int reg, unsigned char val)
{
        return i2c_writeb(bus, chip_addr, reg, val);
}
 
/*
 * Read a value from a register
 *
 * @param chip_addr     i2c addr for max77686
 * @param reg           reg number to write
 * @param val           value to be written
 *
 */
static inline int max77686_i2c_read(unsigned int bus, unsigned char chip_addr,
                                        unsigned int reg, unsigned char *val)
{
        return i2c_readb(bus, chip_addr, reg, (uint8_t *)val);
}
 
/*
 * Enable the max77686 register
 *
 * @param reg           register number of buck/ldo to be enabled
 * @param enable        enable or disable bit
 *
 *                      REG_DISABLE = 0,
                        needed to set the buck/ldo enable bit OFF
 * @return              Return 0 if ok, else -1
 */
static int max77686_enablereg(unsigned int bus, enum max77686_regnum reg, int enable)
{
        struct max77686_para *pmic;
        unsigned char read_data;
        int ret;
 
        pmic = &max77686_param[reg];
 
        ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, pmic->reg_enaddr,
                                &read_data);
        if (ret != 0) {
                printk(BIOS_DEBUG, "max77686 i2c read failed.\n");
                return -1;
        }
 
        if (enable == REG_DISABLE) {
                clrbits8(&read_data,
                                pmic->reg_enbitmask << pmic->reg_enbitpos);
        } else {
                clrsetbits8(&read_data,
                                pmic->reg_enbitmask << pmic->reg_enbitpos,
                                pmic->reg_enbiton << pmic->reg_enbitpos);
        }
 
        ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR,
                                 pmic->reg_enaddr, read_data);
        if (ret != 0) {
                printk(BIOS_DEBUG, "max77686 i2c write failed.\n");
                return -1;
        }
 
        return 0;
}
 
int max77686_volsetting(unsigned int bus, enum max77686_regnum reg,
                        unsigned int volt, int enable, int volt_units)
{
        struct max77686_para *pmic;
        unsigned char read_data;
        int vol_level = 0;
        int ret;
 
        pmic = &max77686_param[reg];
 
        if (pmic->vol_addr == 0) {
                printk(BIOS_DEBUG, "not a voltage register.\n");
                return -1;
        }
 
        ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, pmic->vol_addr, &read_data);
        if (ret != 0) {
                printk(BIOS_DEBUG, "max77686 i2c read failed.\n");
                return -1;
        }
 
        if (volt_units == MAX77686_UV)
                vol_level = volt - (u32)pmic->vol_min * 1000;
        else
                vol_level = (volt - (u32)pmic->vol_min) * 1000;
 
        if (vol_level < 0) {
                printk(BIOS_DEBUG, "Not a valid voltage level to set\n");
                return -1;
        }
        vol_level /= (u32)pmic->vol_div;
 
        clrsetbits8(&read_data, pmic->vol_bitmask << pmic->vol_bitpos,
                        vol_level << pmic->vol_bitpos);
 
        ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, pmic->vol_addr, read_data);
        if (ret != 0) {
                printk(BIOS_DEBUG, "max77686 i2c write failed.\n");
                return -1;
        }
 
        ret = max77686_enablereg(bus, reg, enable);
        if (ret != 0) {
                printk(BIOS_DEBUG, "Failed to enable buck/ldo.\n");
                return -1;
        }
        return 0;
}
 
int max77686_enable_32khz_cp(unsigned int bus)
{
        return max77686_enablereg(bus, PMIC_EN32KHZ_CP, REG_ENABLE);
}
 
int max77686_disable_backup_batt(unsigned int bus)
{
        unsigned char val;
        int ret;
 
        ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, REG_BBAT, &val);
        if (ret) {
                printk(BIOS_DEBUG, "max77686 i2c read failed\n");
                return ret;
        }
 
        /* If we already have the correct values, exit */
        if ((val & (BBAT_BBCVS_MASK | BBAT_BBCHOSTEN_MASK)) ==
                        BBAT_BBCVS_MASK)
                return 0;
 
        /* First disable charging */
        val &= ~BBAT_BBCHOSTEN_MASK;
        ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, REG_BBAT, val);
        if (ret) {
                printk(BIOS_DEBUG, "max77686 i2c write failed\n");
                return -1;
        }
 
        /* Finally select 3.5V to minimize power consumption */
        val |= BBAT_BBCVS_MASK;
        ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, REG_BBAT, val);
        if (ret) {
                printk(BIOS_DEBUG, "max77686 i2c write failed\n");
                return -1;
        }
 
        return 0;
}