69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright 2018 MediaTek Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <arch/io.h>
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#include <assert.h>
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#include <console/console.h>
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#include <delay.h>
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#include <soc/addressmap.h>
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#include <soc/auxadc.h>
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#include <soc/infracfg.h>
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#include <timer.h>
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static struct mtk_auxadc_regs *const mtk_auxadc = (void *)AUXADC_BASE;
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/*
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* Wait until a condition becomes true or times out
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*
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* cond : a C expression to wait for
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* timeout : msecs
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*/
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#define wait_ms(cond, timeout) \
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({ \
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struct stopwatch sw; \
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int expired = 0; \
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stopwatch_init_msecs_expire(&sw, timeout); \
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while (!(cond) && !(expired = stopwatch_expired(&sw))) \
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; /* wait */ \
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assert(!expired); \
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})
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static uint32_t auxadc_get_rawdata(int channel)
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{
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setbits_le32(&mt8183_infracfg->module_sw_cg_1_clr, 1 << 10);
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wait_ms(!(read32(&mtk_auxadc->con2) & 0x1), 300);
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clrbits_le32(&mtk_auxadc->con1, 1 << channel);
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wait_ms(!(read32(&mtk_auxadc->data[channel]) & (1 << 12)), 300);
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setbits_le32(&mtk_auxadc->con1, 1 << channel);
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udelay(25);
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wait_ms(read32(&mtk_auxadc->data[channel]) & (1 << 12), 300);
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uint32_t value = read32(&mtk_auxadc->data[channel]) & 0x0FFF;
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setbits_le32(&mt8183_infracfg->module_sw_cg_1_set, 1 << 10);
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return value;
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}
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int auxadc_get_voltage(unsigned int channel)
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{
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assert(channel < 16);
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/* 1.5V in 4096 steps */
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return (int)((int64_t)auxadc_get_rawdata(channel) * 1500000 / 4096);
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}
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