| /* 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; |
| } |