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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 <arch/io.h>
#include <assert.h>
#include <console/console.h>
#include <delay.h>
#include <soc/addressmap.h>
#include <soc/auxadc.h>
#include <soc/infracfg.h>
#include <timer.h>
static struct mtk_auxadc_regs *const mtk_auxadc = (void *)AUXADC_BASE;
/*
* Wait until a condition becomes true or times out
*
* cond : a C expression to wait for
* timeout : msecs
*/
#define wait_ms(cond, timeout) \
({ \
struct stopwatch sw; \
int expired = 0; \
stopwatch_init_msecs_expire(&sw, timeout); \
while (!(cond) && !(expired = stopwatch_expired(&sw))) \
; /* wait */ \
assert(!expired); \
})
static uint32_t auxadc_get_rawdata(int channel)
{
setbits_le32(&mt8183_infracfg->module_sw_cg_1_clr, 1 << 10);
wait_ms(!(read32(&mtk_auxadc->con2) & 0x1), 300);
clrbits_le32(&mtk_auxadc->con1, 1 << channel);
wait_ms(!(read32(&mtk_auxadc->data[channel]) & (1 << 12)), 300);
setbits_le32(&mtk_auxadc->con1, 1 << channel);
udelay(25);
wait_ms(read32(&mtk_auxadc->data[channel]) & (1 << 12), 300);
uint32_t value = read32(&mtk_auxadc->data[channel]) & 0x0FFF;
setbits_le32(&mt8183_infracfg->module_sw_cg_1_set, 1 << 10);
return value;
}
int auxadc_get_voltage(unsigned int channel)
{
assert(channel < 16);
/* 1.5V in 4096 steps */
return (int)((int64_t)auxadc_get_rawdata(channel) * 1500000 / 4096);
}
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