src/mainboard/google/foster/pmic.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright 2014 Google Inc.
   5  * Copyright (c) 2013-2015, NVIDIA CORPORATION.  All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <boardid.h>
  18 #include <console/console.h>
  19 #include <delay.h>
  20 #include <device/i2c_simple.h>
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23
  24 #include "pmic.h"
  25 #include "reset.h"
  26
  27 enum {
  28         MAX77620_I2C_ADDR = 0x3c
  29 };
  30
  31 struct max77620_init_reg {
  32         u8 reg;
  33         u8 val;
  34         u8 delay;
  35 };
  36
  37 static struct max77620_init_reg init_list[] = {
  38         /* TODO */
  39 };
  40
  41 static void pmic_write_reg(unsigned bus, uint8_t reg, uint8_t val, int delay)
  42 {
  43         if (i2c_writeb(bus, MAX77620_I2C_ADDR, reg, val)) {
  44                 printk(BIOS_ERR, "%s: reg = 0x%02X, value = 0x%02X failed!\n",
  45                         __func__, reg, val);
  46                 /* Reset the board on any PMIC write error */
  47                 board_reset();
  48         } else {
  49                 if (delay)
  50                         udelay(500);
  51         }
  52 }
  53
  54 static void pmic_slam_defaults(unsigned bus)
  55 {
  56         int i;
  57         for (i = 0; i < ARRAY_SIZE(init_list); i++) {
  58                 struct max77620_init_reg *reg = &init_list[i];
  59                 pmic_write_reg(bus, reg->reg, reg->val, reg->delay);
  60         }
  61 }
  62
  63 void pmic_init(unsigned bus)
  64 {
  65         /* Restore PMIC POR defaults, in case kernel changed 'em */
  66         pmic_slam_defaults(bus);
  67
  68         /* Setup/Enable GPIO5 - VDD_CPU_REG_EN */
  69         pmic_write_reg(bus, MAX77620_GPIO5_REG, 0x09, 1);
  70
  71         /* Setup/Enable GPIO1 - VDD_HDMI_5V0_BST_EN -- ??? */
  72         pmic_write_reg(bus, MAX77620_GPIO1_REG, 0x09, 1);
  73
  74         /* GPIO 0,1,5,6,7 = GPIO, 2,3,4 = alt mode */
  75         pmic_write_reg(bus, MAX77620_AME_GPIO, 0x1c, 1);
  76
  77         /* Disable SD1 Remote Sense, Set SD1 for LPDDR4 to 1.125v? */
  78         pmic_write_reg(bus, MAX77620_CNFG2SD_REG, 0x04, 1);
  79
  80         pmic_write_reg(bus, MAX77620_SD1_REG, 0x2a, 1);
  81
  82         /* CNFG1_L2 = 0xF2 for 3.3v, enabled */
  83         pmic_write_reg(bus, MAX77620_CNFG1_L2_REG, 0xf2, 1);
  84
  85         /* CNFG1_L1 = 0xCA for 1.05v, enabled */
  86         pmic_write_reg(bus, MAX77620_CNFG1_L1_REG, 0xca, 1);
  87
  88         printk(BIOS_DEBUG, "PMIC init done\n");
  89 }