mt6360.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <device/i2c_simple.h>
#include <soc/mt6360.h>
#include <stdbool.h>
 
static struct mt6360_i2c_data i2c_data[] = {
        [MT6360_INDEX_LDO] = {
                .addr = MT6360_LDO_I2C_ADDR,
        },
        [MT6360_INDEX_PMIC] = {
                .addr = MT6360_PMIC_I2C_ADDR,
        },
};
 
static const uint32_t mt6360_ldo1_vsel_table[0x10] = {
        [0x4] = 1800000,
        [0x5] = 2000000,
        [0x6] = 2100000,
        [0x7] = 2500000,
        [0x8] = 2700000,
        [0x9] = 2800000,
        [0xA] = 2900000,
        [0xB] = 3000000,
        [0xC] = 3100000,
        [0xD] = 3300000,
};
 
static const uint32_t mt6360_ldo3_vsel_table[0x10] = {
        [0x4] = 1800000,
        [0xA] = 2900000,
        [0xB] = 3000000,
        [0xD] = 3300000,
};
 
static const uint32_t mt6360_ldo5_vsel_table[0x10] = {
        [0x2] = 2900000,
        [0x3] = 3000000,
        [0x5] = 3300000,
};
 
static const struct mt6360_data regulator_data[MT6360_REGULATOR_COUNT] = {
        [MT6360_LDO3]  = MT6360_DATA(0x05, 0x40, 0x09, 0xff, mt6360_ldo3_vsel_table),
        [MT6360_LDO5]  = MT6360_DATA(0x0b, 0x40, 0x0f, 0xff, mt6360_ldo5_vsel_table),
        [MT6360_LDO6]  = MT6360_DATA(0x37, 0x40, 0x3b, 0xff, mt6360_ldo3_vsel_table),
        [MT6360_LDO7]  = MT6360_DATA(0x31, 0x40, 0x35, 0xff, mt6360_ldo5_vsel_table),
        [MT6360_BUCK1] = MT6360_DATA(0x17, 0x40, 0x10, 0xff, mt6360_ldo1_vsel_table),
        [MT6360_BUCK2] = MT6360_DATA(0x27, 0x40, 0x20, 0xff, mt6360_ldo1_vsel_table),
        [MT6360_LDO1]  = MT6360_DATA(0x17, 0x40, 0x1b, 0xff, mt6360_ldo1_vsel_table),
        [MT6360_LDO2]  = MT6360_DATA(0x11, 0x40, 0x15, 0xff, mt6360_ldo1_vsel_table),
};
 
#define CRC8_TABLE_SIZE 256
static u8 crc8_table[MT6360_INDEX_COUNT][CRC8_TABLE_SIZE];
 
static u8 crc8(const u8 table[CRC8_TABLE_SIZE], u8 *pdata, size_t nbytes)
{
        u8 crc = 0;
 
        while (nbytes-- > 0)
                crc = table[(crc ^ *pdata++) & 0xff];
 
        return crc;
}
 
static void crc8_populate_msb(u8 table[CRC8_TABLE_SIZE], u8 polynomial)
{
        int i, j;
        const u8 msbit = 0x80;
        u8 t = msbit;
 
        table[0] = 0;
 
        for (i = 1; i < CRC8_TABLE_SIZE; i *= 2) {
                t = (t << 1) ^ (t & msbit ? polynomial : 0);
                for (j = 0; j < i; j++)
                        table[i + j] = table[j] ^ t;
        }
}
 
static int mt6360_i2c_write_byte(u8 index, u8 reg, u8 data)
{
        u8 chunk[5] = { 0 };
        struct mt6360_i2c_data *i2c = &i2c_data[index];
 
        if ((reg & 0xc0) != 0) {
                printk(BIOS_ERR, "%s: not support reg [%#x]\n", __func__, reg);
                return -1;
        }
 
        /*
         * chunk[0], dev address
         * chunk[1], reg address
         * chunk[2], data to write
         * chunk[3], crc of chunk[0 ~ 2]
         * chunk[4], blank
         */
        chunk[0] = (i2c->addr & 0x7f) << 1;
        chunk[1] = (reg & 0x3f);
        chunk[2] = data;
        chunk[3] = crc8(crc8_table[index], chunk, 3);
 
        return i2c_write_raw(i2c->bus, i2c->addr, &chunk[1], 4);
}
 
static int mt6360_i2c_read_byte(u8 index, u8 reg, u8 *data)
{
        u8 chunk[4] = { 0 };
        u8 buf[2];
        int ret;
        u8 crc;
        struct mt6360_i2c_data *i2c = &i2c_data[index];
 
        ret = i2c_read_bytes(i2c->bus, i2c->addr, reg & 0x3f, buf, 2);
 
        if (ret)
                return ret;
        /*
         * chunk[0], dev address
         * chunk[1], reg address
         * chunk[2], received data
         * chunk[3], received crc of chunk[0 ~ 2]
         */
        chunk[0] = ((i2c->addr & 0x7f) << 1) + 1;
        chunk[1] = (reg & 0x3f);
        chunk[2] = buf[0];
        chunk[3] = buf[1];
        crc = crc8(crc8_table[index], chunk, 3);
 
        if (chunk[3] != crc) {
                printk(BIOS_ERR, "%s: incorrect CRC: expected %#x, got %#x",
                       __func__, crc, chunk[3]);
                return -1;
        }
 
        *data = chunk[2];
 
        return 0;
}
 
static int mt6360_read_interface(u8 index, u8 reg, u8 *data, u8 mask, u8 shift)
{
        int ret;
        u8 val = 0;
 
        ret = mt6360_i2c_read_byte(index, reg, &val);
        if (ret < 0) {
                printk(BIOS_ERR, "%s: fail, reg = %#x, ret = %d\n",
                       __func__, reg, ret);
                return ret;
        }
        val &= (mask << shift);
        *data = (val >> shift);
        return 0;
}
 
static int mt6360_config_interface(u8 index, u8 reg, u8 data, u8 mask, u8 shift)
{
        int ret;
        u8 val = 0;
 
        ret = mt6360_i2c_read_byte(index, reg, &val);
        if (ret < 0) {
                printk(BIOS_ERR, "%s: fail, reg = %#x, ret = %d\n",
                       __func__, reg, ret);
                return ret;
        }
        val &= ~(mask << shift);
        val |= (data << shift);
 
        return mt6360_i2c_write_byte(index, reg, val);
}
 
static bool is_valid_ldo(enum mt6360_regulator_id id)
{
        if (id != MT6360_LDO1 && id != MT6360_LDO2 &&
            id != MT6360_LDO3 && id != MT6360_LDO5) {
                printk(BIOS_ERR, "%s: LDO %d is not supported\n", __func__, id);
                return false;
        }
 
        return true;
}
 
static bool is_valid_pmic(enum mt6360_regulator_id id)
{
        if (id != MT6360_LDO6 && id != MT6360_LDO7 &&
            id != MT6360_BUCK1 && id != MT6360_BUCK2) {
                printk(BIOS_ERR, "%s: PMIC %d is not supported\n", __func__, id);
                return false;
        }
 
        return true;
}
 
static void mt6360_ldo_enable(enum mt6360_regulator_id id, uint8_t enable)
{
        u8 val;
        const struct mt6360_data *data;
 
        if (!is_valid_ldo(id))
                return;
 
        data = &regulator_data[id];
 
        if (mt6360_read_interface(MT6360_INDEX_LDO, data->enable_reg, &val, 0xff, 0) < 0)
                return;
 
        if (enable)
                val |= data->enable_mask;
        else
                val &= ~(data->enable_mask);
 
        mt6360_config_interface(MT6360_INDEX_LDO, data->enable_reg, val, 0xff, 0);
}
 
static uint8_t mt6360_ldo_is_enabled(enum mt6360_regulator_id id)
{
        u8 val;
        const struct mt6360_data *data;
 
        if (!is_valid_ldo(id))
                return 0;
 
        data = &regulator_data[id];
 
        if (mt6360_read_interface(MT6360_INDEX_LDO, data->enable_reg, &val, 0xff, 0) < 0)
                return 0;
 
        return (val & data->enable_mask) ? 1 : 0;
}
 
static void mt6360_ldo_set_voltage(enum mt6360_regulator_id id, u32 voltage_uv)
{
        u8 val = 0;
        u32 voltage_uv_temp = 0;
        int i;
 
        const struct mt6360_data *data;
 
        if (!is_valid_ldo(id))
                return;
 
        data = &regulator_data[id];
 
        for (i = 0; i < data->vsel_table_len; i++) {
                u32 uv = data->vsel_table[i];
 
                if (uv == 0)
                        continue;
                if (uv > voltage_uv)
                        break;
 
                val = i << 4;
                voltage_uv_temp = voltage_uv - uv;
        }
 
        if (val == 0) {
                printk(BIOS_ERR, "%s: LDO %d, set %d uV not supported\n",
                       __func__, id, voltage_uv);
                return;
        }
 
        voltage_uv_temp /= 10000;
        voltage_uv_temp = MIN(voltage_uv_temp, 0xa);
        val |= (u8)voltage_uv_temp;
 
        mt6360_config_interface(MT6360_INDEX_LDO, data->vsel_reg, val, 0xff, 0);
}
 
static u32 mt6360_ldo_get_voltage(enum mt6360_regulator_id id)
{
        u8 val;
        u32 voltage_uv;
 
        const struct mt6360_data *data;
 
        if (!is_valid_ldo(id))
                return 0;
 
        data = &regulator_data[id];
 
        if (mt6360_read_interface(MT6360_INDEX_LDO, data->vsel_reg, &val, 0xff, 0) < 0)
                return 0;
 
        voltage_uv = data->vsel_table[(val & 0xf0) >> 4];
        if (voltage_uv == 0) {
                printk(BIOS_ERR, "%s: LDO %d read fail, reg = %#x\n", __func__, id, val);
                return 0;
        }
 
        val = MIN(val & 0x0f, 0x0a);
        voltage_uv += val * 10000;
 
        return voltage_uv;
}
 
static void mt6360_pmic_enable(enum mt6360_regulator_id id, uint8_t enable)
{
        u8 val;
        const struct mt6360_data *data;
 
        if (!is_valid_pmic(id))
                return;
 
        data = &regulator_data[id];
 
        if (mt6360_read_interface(MT6360_INDEX_PMIC, data->enable_reg, &val, 0xff, 0) < 0)
                return;
 
        if (enable)
                val |= data->enable_mask;
        else
                val &= ~(data->enable_mask);
 
        mt6360_config_interface(MT6360_INDEX_PMIC, data->enable_reg, val, 0xff, 0);
}
 
static uint8_t mt6360_pmic_is_enabled(enum mt6360_regulator_id id)
{
        u8 val;
        const struct mt6360_data *data;
 
        if (!is_valid_pmic(id))
                return 0;
 
        data = &regulator_data[id];
 
        if (mt6360_read_interface(MT6360_INDEX_PMIC, data->enable_reg, &val, 0xff, 0) < 0)
                return 0;
 
        return (val & data->enable_mask) ? 1 : 0;
}
 
static void mt6360_pmic_set_voltage(enum mt6360_regulator_id id, u32 voltage_uv)
{
        u8 val = 0;
 
        const struct mt6360_data *data;
 
        if (!is_valid_pmic(id))
                return;
 
        data = &regulator_data[id];
 
        if (id == MT6360_BUCK1 || id == MT6360_BUCK2) {
                val = (voltage_uv - 300000) / 5000;
        } else if (id == MT6360_LDO6 || id == MT6360_LDO7) {
                val = (((voltage_uv - 500000) / 100000) << 4);
                val += (((voltage_uv - 500000) % 100000) / 10000);
        }
 
        mt6360_config_interface(MT6360_INDEX_PMIC, data->vsel_reg, val, 0xff, 0);
}
 
static u32 mt6360_pmic_get_voltage(enum mt6360_regulator_id id)
{
        u8 val;
        u32 voltage_uv = 0;
 
        const struct mt6360_data *data;
 
        if (!is_valid_pmic(id))
                return 0;
 
        data = &regulator_data[id];
 
        if (mt6360_read_interface(MT6360_INDEX_PMIC, data->vsel_reg, &val, 0xff, 0) < 0)
                return 0;
 
        if (id == MT6360_BUCK1 || id == MT6360_BUCK2) {
                voltage_uv = 300000 + val * 5000;
        } else if (id == MT6360_LDO6 || id == MT6360_LDO7) {
                voltage_uv = 500000 + 100000 * (val >> 4);
                voltage_uv += MIN(val & 0xf, 0xa) * 10000;
        }
 
        return voltage_uv;
}
 
void mt6360_init(uint8_t bus)
{
        u8 delay01, delay02, delay03, delay04;
 
        crc8_populate_msb(crc8_table[MT6360_INDEX_LDO], 0x7);
        crc8_populate_msb(crc8_table[MT6360_INDEX_PMIC], 0x7);
 
        i2c_data[MT6360_INDEX_LDO].bus = bus;
        i2c_data[MT6360_INDEX_PMIC].bus = bus;
 
        mt6360_config_interface(MT6360_INDEX_PMIC, 0x07, 0x04, 0xff, 0);
        mt6360_config_interface(MT6360_INDEX_PMIC, 0x08, 0x00, 0xff, 0);
        mt6360_config_interface(MT6360_INDEX_PMIC, 0x09, 0x02, 0xff, 0);
        mt6360_config_interface(MT6360_INDEX_PMIC, 0x0a, 0x00, 0xff, 0);
 
        mt6360_read_interface(MT6360_INDEX_PMIC, 0x07, &delay01, 0xff, 0);
        mt6360_read_interface(MT6360_INDEX_PMIC, 0x08, &delay02, 0xff, 0);
        mt6360_read_interface(MT6360_INDEX_PMIC, 0x09, &delay03, 0xff, 0);
        mt6360_read_interface(MT6360_INDEX_PMIC, 0x0a, &delay04, 0xff, 0);
        printk(BIOS_DEBUG,
               "%s: power off sequence delay: %#x, %#x, %#x, %#x\n",
               __func__, delay01, delay02, delay03, delay04);
}
 
void mt6360_enable(enum mt6360_regulator_id id, uint8_t enable)
{
        if (is_valid_ldo(id))
                mt6360_ldo_enable(id, enable);
        else if (is_valid_pmic(id))
                mt6360_pmic_enable(id, enable);
}
 
uint8_t mt6360_is_enabled(enum mt6360_regulator_id id)
{
        if (is_valid_ldo(id))
                return mt6360_ldo_is_enabled(id);
        else if (is_valid_pmic(id))
                return mt6360_pmic_is_enabled(id);
        else
                return 0;
}
 
void mt6360_set_voltage(enum mt6360_regulator_id id, u32 voltage_uv)
{
        if (is_valid_ldo(id))
                mt6360_ldo_set_voltage(id, voltage_uv);
        else if (is_valid_pmic(id))
                mt6360_pmic_set_voltage(id, voltage_uv);
}
 
u32 mt6360_get_voltage(enum mt6360_regulator_id id)
{
        if (is_valid_ldo(id))
                return mt6360_ldo_get_voltage(id);
        else if (is_valid_pmic(id))
                return mt6360_pmic_get_voltage(id);
        else
                return 0;
}