42adb29853
Get board id from AUXIN4 and RAM code from AUXIN3.
BUG=b:80501386
BRANCH=none
TEST=AUXIN4 is 0.074v and AUXIN3 is 0.212v on P0.
AUXIN4 is 0.212v and AUXIN3 is 0.212v on P1.
Change-Id: I50533e851d2fae66ae8c5e4e1aa36708d9058e94
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/29062
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/*
|
|
* 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 <assert.h>
|
|
#include <boardid.h>
|
|
#include <soc/auxadc.h>
|
|
#include <stddef.h>
|
|
|
|
static uint32_t get_index(unsigned int channel, uint32_t *cached_id)
|
|
{
|
|
static const int voltages[] = {
|
|
/* ID : Voltage (unit: uV) */
|
|
/* 0 : */ 74000,
|
|
/* 1 : */ 212000,
|
|
/* 2 : */ 319000,
|
|
/* 3 : */ 429000,
|
|
/* 4 : */ 542000,
|
|
/* 5 : */ 666000,
|
|
/* 6 : */ 781000,
|
|
/* 7 : */ 900000,
|
|
/* 8 : */ 1023000,
|
|
/* 9 : */ 1137000,
|
|
/* 10 : */ 1240000,
|
|
/* 11 : */ 1343000,
|
|
/* 12 : */ 1457000
|
|
};
|
|
|
|
uint32_t id;
|
|
|
|
if (*cached_id != BOARD_ID_UNKNOWN)
|
|
return *cached_id;
|
|
|
|
int value = auxadc_get_voltage(channel);
|
|
/* Find the closest voltage */
|
|
for (id = 0; id < ARRAY_SIZE(voltages) - 1; id++)
|
|
if (value < (voltages[id] + voltages[id + 1]) / 2)
|
|
break;
|
|
|
|
const int tolerance = 10000; /* 10,000 uV */
|
|
assert(ABS(value - voltages[id]) < tolerance);
|
|
|
|
*cached_id = id;
|
|
return id;
|
|
}
|
|
|
|
uint32_t board_id(void)
|
|
{
|
|
static uint32_t cached_board_id = BOARD_ID_UNKNOWN;
|
|
return get_index(4, &cached_board_id);
|
|
}
|
|
|
|
uint32_t ram_code(void)
|
|
{
|
|
static uint32_t cached_ram_code = BOARD_ID_UNKNOWN;
|
|
return get_index(3, &cached_ram_code);
|
|
}
|