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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 <assert.h>
#include <boardid.h>
#include <soc/auxadc.h>
#include <ec/google/chromeec/ec.h>
#include <stddef.h>
/* For CBI un-provisioned/corrupted Flapjack board. */
#define FLAPJACK_UNDEF_SKU_ID 0
#define ADC_LEVELS 12
enum {
LCM_ID_CHANNEL = 2, /* ID of LCD Module on schematics. */
RAM_ID_CHANNEL = 3,
SKU_ID_CHANNEL = 4,
};
static const int ram_voltages[ADC_LEVELS] = {
/* 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,
};
static const int lcm_voltages[ADC_LEVELS] = {
/* ID : Voltage (unit: uV) */
/* 0 : */ 0,
/* 1 : */ 283000,
/* 2 : */ 440000,
/* 3 : */ 503000,
/* 4 : */ 608000,
/* 5 : */ 703000,
/* 6 : */ 830000,
/* 7 : */ 865000,
/* 8 : */ 953000,
/* 9 : */ 1079000,
/* 10 : */ 1128000,
/* 11 : */ 1434000,
};
static const int *adc_voltages[] = {
[LCM_ID_CHANNEL] = lcm_voltages,
[RAM_ID_CHANNEL] = ram_voltages,
[SKU_ID_CHANNEL] = ram_voltages, /* SKU ID is sharing RAM voltages. */
};
static uint32_t get_adc_index(unsigned int channel)
{
int value = auxadc_get_voltage(channel);
assert(channel < ARRAY_SIZE(adc_voltages));
const int *voltages = adc_voltages[channel];
assert(voltages);
/* Find the closest voltage */
uint32_t id;
for (id = 0; id < ADC_LEVELS - 1; id++)
if (value < (voltages[id] + voltages[id + 1]) / 2)
break;
const int tolerance = 10000; /* 10,000 uV */
assert(ABS(value - voltages[id]) < tolerance);
return id;
}
/* board_id is provided by ec/google/chromeec/ec_boardid.c */
uint32_t sku_id(void)
{
static uint32_t cached_sku_id = BOARD_ID_INIT;
if (cached_sku_id != BOARD_ID_INIT)
return cached_sku_id;
/* On Flapjack, getting the SKU via CBI. */
if (CONFIG(BOARD_GOOGLE_FLAPJACK)) {
if (google_chromeec_cbi_get_sku_id(&cached_sku_id))
cached_sku_id = FLAPJACK_UNDEF_SKU_ID;
return cached_sku_id;
}
/* Quirk for Kukui: All Rev1/Sku0 had incorrectly set SKU_ID=1. */
if (CONFIG(BOARD_GOOGLE_KUKUI)) {
if (board_id() == 1) {
cached_sku_id = 0;
return cached_sku_id;
}
}
/*
* The SKU (later used for device tree matching) is combined from:
* ADC2[4bit/H] = straps on LCD module (type of panel).
* ADC4[4bit/L] = SKU ID from board straps.
*/
cached_sku_id = (get_adc_index(LCM_ID_CHANNEL) << 4 |
get_adc_index(SKU_ID_CHANNEL));
return cached_sku_id;
}
uint32_t ram_code(void)
{
static uint32_t cached_ram_code = BOARD_ID_INIT;
if (cached_ram_code == BOARD_ID_INIT)
cached_ram_code = get_adc_index(RAM_ID_CHANNEL);
return cached_ram_code;
}
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