69 lines
1.6 KiB
C
69 lines
1.6 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 <assert.h>
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#include <boardid.h>
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#include <soc/auxadc.h>
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#include <stddef.h>
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static uint32_t get_index(unsigned int channel, uint32_t *cached_id)
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{
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static const int voltages[] = {
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/* ID : Voltage (unit: uV) */
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/* 0 : */ 74000,
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/* 1 : */ 212000,
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/* 2 : */ 319000,
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/* 3 : */ 429000,
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/* 4 : */ 542000,
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/* 5 : */ 666000,
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/* 6 : */ 781000,
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/* 7 : */ 900000,
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/* 8 : */ 1023000,
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/* 9 : */ 1137000,
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/* 10 : */ 1240000,
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/* 11 : */ 1343000,
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/* 12 : */ 1457000
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};
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uint32_t id;
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if (*cached_id != BOARD_ID_UNKNOWN)
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return *cached_id;
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int value = auxadc_get_voltage(channel);
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/* Find the closest voltage */
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for (id = 0; id < ARRAY_SIZE(voltages) - 1; id++)
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if (value < (voltages[id] + voltages[id + 1]) / 2)
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break;
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const int tolerance = 10000; /* 10,000 uV */
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assert(ABS(value - voltages[id]) < tolerance);
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*cached_id = id;
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return id;
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}
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uint32_t board_id(void)
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{
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static uint32_t cached_board_id = BOARD_ID_UNKNOWN;
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return get_index(4, &cached_board_id);
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}
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uint32_t ram_code(void)
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{
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static uint32_t cached_ram_code = BOARD_ID_UNKNOWN;
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return get_index(3, &cached_ram_code);
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}
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