henryc.chen | 21e4bd4 | 2021-03-04 09:44:42 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | #include <console/console.h> |
| 4 | #include <device/i2c_simple.h> |
| 5 | #include <soc/mt6691.h> |
| 6 | |
| 7 | #define MT6691_MIN_VOLTAGE 300000 |
| 8 | #define MT6691_MAX_VOLTAGE 1300000 |
| 9 | #define MT6691_STEP_UV 5000 |
| 10 | |
| 11 | enum { |
| 12 | MT6691_SLAVE_ADDR = 0x51, |
| 13 | }; |
| 14 | |
| 15 | int mt6691_set_voltage(uint8_t i2c_num, unsigned int volt_uv) |
| 16 | { |
| 17 | uint8_t selector; |
| 18 | |
| 19 | if (volt_uv > MT6691_MAX_VOLTAGE || volt_uv < MT6691_MIN_VOLTAGE) { |
| 20 | printk(BIOS_ERR, "%s: voltage out of range\n", __func__); |
| 21 | return -1; |
| 22 | } |
| 23 | |
| 24 | selector = DIV_ROUND_UP(volt_uv - MT6691_MIN_VOLTAGE, MT6691_STEP_UV); |
| 25 | |
| 26 | return i2c_write_field(i2c_num, MT6691_SLAVE_ADDR, |
| 27 | MT6691_VSEL0, selector, 0xFF, 0); |
| 28 | } |
| 29 | |
| 30 | int mt6691_get_voltage(uint8_t i2c_num) |
| 31 | { |
| 32 | uint8_t selector = 0; |
| 33 | unsigned int volt; |
| 34 | |
| 35 | if (i2c_read_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_VSEL0, |
| 36 | &selector, 0xFF, 0) < 0) { |
| 37 | printk(BIOS_ERR, "%s: failed to get voltage from i2c\n", __func__); |
| 38 | return -1; |
| 39 | } |
| 40 | |
| 41 | volt = (selector * MT6691_STEP_UV) + MT6691_MIN_VOLTAGE; |
| 42 | |
| 43 | if (volt > MT6691_MAX_VOLTAGE) { |
| 44 | printk(BIOS_ERR, "%s: voltage out of range\n", __func__); |
| 45 | return -1; |
| 46 | } |
| 47 | |
| 48 | return volt; |
| 49 | } |
| 50 | |
| 51 | static uint8_t get_mt6691_chip_id(uint8_t i2c_num) |
| 52 | { |
| 53 | uint8_t id; |
| 54 | |
| 55 | if (i2c_read_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_MONITOR, |
| 56 | &id, 0x1, MT6691_PGOOD_SHIFT) < 0) { |
| 57 | printk(BIOS_ERR, "%s: failed to read from i2c", __func__); |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | return id; |
| 62 | } |
| 63 | |
| 64 | void mt6691_probe(uint8_t i2c_num) |
| 65 | { |
| 66 | /* Check device ID is MT6691 */ |
| 67 | if (!get_mt6691_chip_id(i2c_num)) { |
| 68 | printk(BIOS_ERR, "ERROR: unknown MT6691 chip_id\n"); |
| 69 | return; |
| 70 | } |
| 71 | /* Slew rate 12mV */ |
| 72 | i2c_write_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_CTRL2, 0x1, |
| 73 | MT6691_DN_SR_MASK, MT6691_DN_SR_SHIFT); |
| 74 | } |