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