LXR uboot/drivers/power/axp152.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2012
   4 * Henrik Nordstrom <henrik@henriknordstrom.net>
   5 */
   6#include <common.h>
   7#include <command.h>
   8#include <asm/arch/pmic_bus.h>
   9#include <axp_pmic.h>
  10
  11static u8 axp152_mvolt_to_target(int mvolt, int min, int max, int div)
  12{
  13        if (mvolt < min)
  14                mvolt = min;
  15        else if (mvolt > max)
  16                mvolt = max;
  17
  18        return (mvolt - min) / div;
  19}
  20
  21int axp_set_dcdc2(unsigned int mvolt)
  22{
  23        int rc;
  24        u8 current, target;
  25
  26        target = axp152_mvolt_to_target(mvolt, 700, 2275, 25);
  27
  28        /* Do we really need to be this gentle? It has built-in voltage slope */
  29        while ((rc = pmic_bus_read(AXP152_DCDC2_VOLTAGE, &current)) == 0 &&
  30               current != target) {
  31                if (current < target)
  32                        current++;
  33                else
  34                        current--;
  35                rc = pmic_bus_write(AXP152_DCDC2_VOLTAGE, current);
  36                if (rc)
  37                        break;
  38        }
  39        return rc;
  40}
  41
  42int axp_set_dcdc3(unsigned int mvolt)
  43{
  44        u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 50);
  45
  46        return pmic_bus_write(AXP152_DCDC3_VOLTAGE, target);
  47}
  48
  49int axp_set_dcdc4(unsigned int mvolt)
  50{
  51        u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);
  52
  53        return pmic_bus_write(AXP152_DCDC4_VOLTAGE, target);
  54}
  55
  56int axp_set_aldo2(unsigned int mvolt)
  57{
  58        u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 100);
  59
  60        return pmic_bus_write(AXP152_LDO2_VOLTAGE, target);
  61}
  62
  63int axp_init(void)
  64{
  65        u8 ver;
  66        int rc;
  67
  68        rc = pmic_bus_init();
  69        if (rc)
  70                return rc;
  71
  72        rc = pmic_bus_read(AXP152_CHIP_VERSION, &ver);
  73        if (rc)
  74                return rc;
  75
  76        if (ver != 0x05)
  77                return -EINVAL;
  78
  79        return 0;
  80}
  81
  82int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  83{
  84        pmic_bus_write(AXP152_SHUTDOWN, AXP152_POWEROFF);
  85
  86        /* infinite loop during shutdown */
  87        while (1) {}
  88
  89        /* not reached */
  90        return 0;
  91}
  92