LXR uboot/board/freescale/common/mc34vr500.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright 2016 Freescale Semiconductor, Inc.
   4 * Hou Zhiqiang <Zhiqiang.Hou@freescale.com>
   5 */
   6
   7#include <common.h>
   8#include <errno.h>
   9#include <i2c.h>
  10#include <log.h>
  11#include <power/pmic.h>
  12#include <power/mc34vr500_pmic.h>
  13
  14static uint8_t swxvolt_addr[4] = { MC34VR500_SW1VOLT,
  15                                   MC34VR500_SW2VOLT,
  16                                   MC34VR500_SW3VOLT,
  17                                   MC34VR500_SW4VOLT };
  18
  19static uint8_t swx_set_point_base[4] = { 13, 9, 9, 9 };
  20
  21int mc34vr500_get_sw_volt(uint8_t sw)
  22{
  23        struct pmic *p;
  24        u32 swxvolt;
  25        uint8_t spb;
  26        int sw_volt;
  27        int ret;
  28
  29        debug("%s: Get SW%u volt from swxvolt_addr = 0x%x\n",
  30              __func__, sw + 1, swxvolt_addr[sw]);
  31        if (sw > SW4) {
  32                printf("%s: Unsupported SW(sw%d)\n", __func__, sw + 1);
  33                return -EINVAL;
  34        }
  35
  36        p = pmic_get("MC34VR500");
  37        if (!p) {
  38                printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
  39                return -ENODEV;
  40        }
  41
  42        ret = pmic_probe(p);
  43        if (ret)
  44                return ret;
  45
  46        ret = pmic_reg_read(p, swxvolt_addr[sw], &swxvolt);
  47        if (ret) {
  48                printf("%s: Failed to get SW%u volt\n", __func__, sw + 1);
  49                return ret;
  50        }
  51
  52        debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
  53        spb = swx_set_point_base[sw];
  54        /* The base of SW volt is 625mV and increase by step 25mV */
  55        sw_volt = 625 + (swxvolt - spb) * 25;
  56
  57        debug("%s: SW%u volt = %dmV\n", __func__, sw + 1, sw_volt);
  58        return sw_volt;
  59}
  60
  61int mc34vr500_set_sw_volt(uint8_t sw, int sw_volt)
  62{
  63        struct pmic *p;
  64        u32 swxvolt;
  65        uint8_t spb;
  66        int ret;
  67
  68        debug("%s: Set SW%u volt to %dmV\n", __func__, sw + 1, sw_volt);
  69        /* The least SW volt is 625mV, and only 4 SW outputs */
  70        if (sw > SW4 || sw_volt < 625)
  71                return -EINVAL;
  72
  73        p = pmic_get("MC34VR500");
  74        if (!p) {
  75                printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
  76                return -ENODEV;
  77        }
  78
  79        ret = pmic_probe(p);
  80        if (ret)
  81                return ret;
  82
  83        spb = swx_set_point_base[sw];
  84        /* The base of SW volt is 625mV and increase by step 25mV */
  85        swxvolt = (sw_volt - 625) / 25 + spb;
  86        debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
  87        if (swxvolt > 63)
  88                return -EINVAL;
  89
  90        ret = pmic_reg_write(p, swxvolt_addr[sw], swxvolt);
  91        if (ret)
  92                return ret;
  93
  94        return 0;
  95}
  96