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google/kukui: Add board id support 

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>
This commit is contained in:
Tristan Shieh 2018-10-12 13:27:15 +08:00 committed by Julius Werner
parent 96631f941d
commit 42adb29853
2 changed files with 71 additions and 0 deletions
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3
src/mainboard/google/kukui/Makefile.inc
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@ -1,3 +1,4 @@
bootblock-y += boardid.c
bootblock-y += bootblock.c
bootblock-y += chromeos.c
bootblock-y += memlayout.ld
@ -6,10 +7,12 @@ decompressor-y += memlayout.ld
verstage-y += chromeos.c
verstage-y += memlayout.ld
romstage-y += boardid.c
romstage-y += chromeos.c
romstage-y += memlayout.ld
romstage-y += romstage.c
ramstage-y += boardid.c
ramstage-y += chromeos.c
ramstage-y += mainboard.c
ramstage-y += memlayout.ld

68
src/mainboard/google/kukui/boardid.c Normal file
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@ -0,0 +1,68 @@
/*
* 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);
}