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/*
* This file is part of the coreboot project.
*
* Copyright 2018 MediaTek Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <device/mmio.h>
#include <assert.h>
#include <delay.h>
#include <soc/addressmap.h>
#include <soc/auxadc.h>
#include <soc/efuse.h>
#include <soc/infracfg.h>
#include <timer.h>
static struct mtk_auxadc_regs *const mtk_auxadc = (void *)AUXADC_BASE;
#define ADC_GE_A_SHIFT 10
#define ADC_GE_A_MASK (0x3ff << ADC_GE_A_SHIFT)
#define ADC_OE_A_SHIFT 0
#define ADC_OE_A_MASK (0x3ff << ADC_OE_A_SHIFT)
#define ADC_CALI_EN_A_SHIFT 20
#define ADC_CALI_EN_A_MASK (0x1 << ADC_CALI_EN_A_SHIFT)
static int cali_oe;
static int cali_ge;
static int calibrated = 0;
static void mt_auxadc_update_cali(void)
{
uint32_t cali_reg;
int cali_ge_a;
int cali_oe_a;
cali_reg = read32(&mtk_efuse->adc_cali_reg);
if ((cali_reg & ADC_CALI_EN_A_MASK) != 0) {
cali_oe_a = (cali_reg & ADC_OE_A_MASK) >> ADC_OE_A_SHIFT;
cali_ge_a = (cali_reg & ADC_GE_A_MASK) >> ADC_GE_A_SHIFT;
cali_ge = cali_ge_a - 512;
cali_oe = cali_oe_a - 512;
}
}
static uint32_t auxadc_get_rawdata(int channel)
{
setbits32(&mt8183_infracfg->module_sw_cg_1_clr, 1 << 10);
assert(wait_ms(300, !(read32(&mtk_auxadc->con2) & 0x1)));
clrbits32(&mtk_auxadc->con1, 1 << channel);
assert(wait_ms(300, !(read32(&mtk_auxadc->data[channel]) & (1 << 12))));
setbits32(&mtk_auxadc->con1, 1 << channel);
udelay(25);
assert(wait_ms(300, read32(&mtk_auxadc->data[channel]) & (1 << 12)));
uint32_t value = read32(&mtk_auxadc->data[channel]) & 0x0FFF;
setbits32(&mt8183_infracfg->module_sw_cg_1_set, 1 << 10);
return value;
}
int auxadc_get_voltage(unsigned int channel)
{
uint32_t raw_value;
assert(channel < 16);
if (!calibrated) {
mt_auxadc_update_cali();
calibrated = 1;
}
/* 1.5V in 4096 steps */
raw_value = auxadc_get_rawdata(channel);
raw_value = raw_value - cali_oe;
return (int)((int64_t)raw_value * 1500000 / (4096 + cali_ge));
}
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