| /* SPDX-License-Identifier: GPL-2.0-only OR MIT */ |
| |
| #include <console/console.h> |
| #include <device/i2c_simple.h> |
| #include <soc/mt6691.h> |
| |
| #define MT6691_MIN_VOLTAGE 300000 |
| #define MT6691_MAX_VOLTAGE 1300000 |
| #define MT6691_STEP_UV 5000 |
| |
| enum { |
| MT6691_SLAVE_ADDR = 0x51, |
| }; |
| |
| int mt6691_set_voltage(uint8_t i2c_num, unsigned int volt_uv) |
| { |
| uint8_t selector; |
| |
| if (volt_uv > MT6691_MAX_VOLTAGE || volt_uv < MT6691_MIN_VOLTAGE) { |
| printk(BIOS_ERR, "%s: voltage out of range\n", __func__); |
| return -1; |
| } |
| |
| selector = DIV_ROUND_UP(volt_uv - MT6691_MIN_VOLTAGE, MT6691_STEP_UV); |
| |
| return i2c_write_field(i2c_num, MT6691_SLAVE_ADDR, |
| MT6691_VSEL0, selector, 0xFF, 0); |
| } |
| |
| int mt6691_get_voltage(uint8_t i2c_num) |
| { |
| uint8_t selector = 0; |
| unsigned int volt; |
| |
| if (i2c_read_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_VSEL0, |
| &selector, 0xFF, 0) < 0) { |
| printk(BIOS_ERR, "%s: failed to get voltage from i2c\n", __func__); |
| return -1; |
| } |
| |
| volt = (selector * MT6691_STEP_UV) + MT6691_MIN_VOLTAGE; |
| |
| if (volt > MT6691_MAX_VOLTAGE) { |
| printk(BIOS_ERR, "%s: voltage out of range\n", __func__); |
| return -1; |
| } |
| |
| return volt; |
| } |
| |
| static uint8_t get_mt6691_chip_id(uint8_t i2c_num) |
| { |
| uint8_t id; |
| |
| if (i2c_read_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_MONITOR, |
| &id, 0x1, MT6691_PGOOD_SHIFT) < 0) { |
| printk(BIOS_ERR, "%s: failed to read from i2c", __func__); |
| return 0; |
| } |
| |
| return id; |
| } |
| |
| void mt6691_probe(uint8_t i2c_num) |
| { |
| /* Check device ID is MT6691 */ |
| if (!get_mt6691_chip_id(i2c_num)) { |
| printk(BIOS_ERR, "unknown MT6691 chip_id\n"); |
| return; |
| } |
| /* Slew rate 12mV */ |
| i2c_write_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_CTRL2, 0x1, |
| MT6691_DN_SR_MASK, MT6691_DN_SR_SHIFT); |
| } |