src/soc/mediatek/mt8195/mt6691.c

   1 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
   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, "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 }