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/*
* Copyright 2016 Freescale Semiconductor, Inc.
* Hou Zhiqiang <Zhiqiang.Hou@freescale.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <i2c.h>
#include <power/pmic.h>
#include <power/mc34vr500_pmic.h>
static uint8_t swxvolt_addr[4] = { MC34VR500_SW1VOLT,
MC34VR500_SW2VOLT,
MC34VR500_SW3VOLT,
MC34VR500_SW4VOLT };
static uint8_t swx_set_point_base[4] = { 13, 9, 9, 9 };
int mc34vr500_get_sw_volt(uint8_t sw)
{
struct pmic *p;
u32 swxvolt;
uint8_t spb;
int sw_volt;
int ret;
debug("%s: Get SW%u volt from swxvolt_addr = 0x%x\n",
__func__, sw + 1, swxvolt_addr[sw]);
if (sw > SW4) {
printf("%s: Unsupported SW(sw%d)\n", __func__, sw + 1);
return -EINVAL;
}
p = pmic_get("MC34VR500");
if (!p) {
printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
return -ENODEV;
}
ret = pmic_probe(p);
if (ret)
return ret;
ret = pmic_reg_read(p, swxvolt_addr[sw], &swxvolt);
if (ret) {
printf("%s: Failed to get SW%u volt\n", __func__, sw + 1);
return ret;
}
debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
spb = swx_set_point_base[sw];
/* The base of SW volt is 625mV and increase by step 25mV */
sw_volt = 625 + (swxvolt - spb) * 25;
debug("%s: SW%u volt = %dmV\n", __func__, sw + 1, sw_volt);
return sw_volt;
}
int mc34vr500_set_sw_volt(uint8_t sw, int sw_volt)
{
struct pmic *p;
u32 swxvolt;
uint8_t spb;
int ret;
debug("%s: Set SW%u volt to %dmV\n", __func__, sw + 1, sw_volt);
/* The least SW volt is 625mV, and only 4 SW outputs */
if (sw > SW4 || sw_volt < 625)
return -EINVAL;
p = pmic_get("MC34VR500");
if (!p) {
printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
return -ENODEV;
}
ret = pmic_probe(p);
if (ret)
return ret;
spb = swx_set_point_base[sw];
/* The base of SW volt is 625mV and increase by step 25mV */
swxvolt = (sw_volt - 625) / 25 + spb;
debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
if (swxvolt > 63)
return -EINVAL;
ret = pmic_reg_write(p, swxvolt_addr[sw], swxvolt);
if (ret)
return ret;
return 0;
}
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