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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <boardid.h>
#include <console/console.h>
#include <gpio.h>
#include <soc/saradc.h>
static const int id_readings[] = {
/* ID : Volts : ADC value : Bucket */
/* == ===== ========= ========== */
#if CONFIG(BOARD_GOOGLE_KEVIN)
/* 0 : 0.109V: 62 : 0 - 91 */ 91,
#else
/* 0 : 0.074V: 42 : 0 - 81 */ 81,
#endif
/* 1 : 0.211V: 120 : 82 - 150 */ 150,
/* 2 : 0.319V: 181 : 151 - 211 */ 211,
/* 3 : 0.427V: 242 : 212 - 274 */ 274,
/* 4 : 0.542V: 307 : 275 - 342 */ 342,
/* 5 : 0.666V: 378 : 343 - 411 */ 411,
/* 6 : 0.781V: 444 : 412 - 477 */ 477,
/* 7 : 0.900V: 511 : 478 - 545 */ 545,
/* 8 : 1.023V: 581 : 546 - 613 */ 613,
/* 9 : 1.137V: 646 : 614 - 675 */ 675,
/* 10 : 1.240V: 704 : 676 - 733 */ 733,
/* 11 : 1.343V: 763 : 734 - 795 */ 795,
/* 12 : 1.457V: 828 : 796 - 861 */ 861,
/* 13 : 1.576V: 895 : 862 - 925 */ 925,
/* 14 : 1.684V: 956 : 926 - 989 */ 989,
/* 15 : 1.800V: 1023 : 990 - 1023 */ 1023
};
_Static_assert(ARRAY_SIZE(id_readings) == 16, "Yo' messed up da table, bruh!");
static int cached_board_id = -1;
static int cached_ram_id = -1;
static uint32_t get_index(uint32_t channel, int *cached_id)
{
int i;
int adc_reading;
if (*cached_id != -1)
return *cached_id;
adc_reading = get_saradc_value(channel);
for (i = 0; i < ARRAY_SIZE(id_readings); i++) {
if (adc_reading <= id_readings[i]) {
printk(BIOS_DEBUG, "ADC reading %d, ID %d\n",
adc_reading, i);
*cached_id = i;
return i;
}
}
die("Read impossible value (> 1023) from 10-bit ADC!");
}
uint32_t board_id(void)
{
return get_index(1, &cached_board_id);
}
uint32_t ram_code(void)
{
return get_index(0, &cached_ram_id);
}
uint32_t sku_id(void)
{
if (!CONFIG(GRU_BASEBOARD_SCARLET))
return UNDEFINED_STRAPPING_ID;
static uint32_t sku_id = UNDEFINED_STRAPPING_ID;
if (sku_id != UNDEFINED_STRAPPING_ID)
return sku_id;
gpio_t pins[3] = {[2] = GPIO(3, D, 6), [1] = GPIO(3, D, 5),
[0] = GPIO(3, D, 4)}; /* GPIO3_D4 is LSB */
sku_id = gpio_pullup_base2_value(pins, ARRAY_SIZE(pins));
return sku_id;
}
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