/* SPDX-License-Identifier: GPL-2.0-only */ #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; }