src/mainboard/google/foster/pmic.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <delay.h>
   5 #include <device/i2c_simple.h>
   6 #include <reset.h>
   7 #include <stdint.h>
   8
   9 #include "pmic.h"
  10
  11 enum {
  12         MAX77620_I2C_ADDR = 0x3c
  13 };
  14
  15 struct max77620_init_reg {
  16         u8 reg;
  17         u8 val;
  18         u8 delay;
  19 };
  20
  21 static void pmic_write_reg(unsigned int bus, uint8_t reg, uint8_t val, int delay)
  22 {
  23         if (i2c_writeb(bus, MAX77620_I2C_ADDR, reg, val)) {
  24                 printk(BIOS_ERR, "%s: reg = 0x%02X, value = 0x%02X failed!\n",
  25                         __func__, reg, val);
  26                 /* Reset the board on any PMIC write error */
  27                 board_reset();
  28         } else {
  29                 if (delay)
  30                         udelay(500);
  31         }
  32 }
  33
  34 void pmic_init(unsigned int bus)
  35 {
  36         /* Setup/Enable GPIO5 - VDD_CPU_REG_EN */
  37         pmic_write_reg(bus, MAX77620_GPIO5_REG, 0x09, 1);
  38
  39         /* Setup/Enable GPIO1 - VDD_HDMI_5V0_BST_EN -- ??? */
  40         pmic_write_reg(bus, MAX77620_GPIO1_REG, 0x09, 1);
  41
  42         /* GPIO 0,1,5,6,7 = GPIO, 2,3,4 = alt mode */
  43         pmic_write_reg(bus, MAX77620_AME_GPIO, 0x1c, 1);
  44
  45         /* Disable SD1 Remote Sense, Set SD1 for LPDDR4 to 1.125v? */
  46         pmic_write_reg(bus, MAX77620_CNFG2SD_REG, 0x04, 1);
  47
  48         pmic_write_reg(bus, MAX77620_SD1_REG, 0x2a, 1);
  49
  50         /* CNFG1_L2 = 0xF2 for 3.3v, enabled */
  51         pmic_write_reg(bus, MAX77620_CNFG1_L2_REG, 0xf2, 1);
  52
  53         /* CNFG1_L1 = 0xCA for 1.05v, enabled */
  54         pmic_write_reg(bus, MAX77620_CNFG1_L1_REG, 0xca, 1);
  55
  56         printk(BIOS_DEBUG, "PMIC init done\n");
  57 }