/* SPDX-License-Identifier: GPL-2.0-only */ #include <assert.h> #include <boardid.h> #include <console/console.h> #include <soc/auxadc.h> /* board_id is provided by ec/google/chromeec/ec_boardid.c */ #define ADC_LEVELS 15 enum { /* RAM IDs */ RAM_ID_HIGH_CHANNEL = 4, RAM_ID_LOW_CHANNEL = 3, /* SKU IDs */ SKU_ID_HIGH_CHANNEL = 6, SKU_ID_LOW_CHANNEL = 5, }; static const unsigned int ram_voltages[ADC_LEVELS] = { /* ID : Voltage (unit: uV) */ [0] = 74300, [1] = 211700, [2] = 318800, [3] = 428600, [4] = 541700, [5] = 665800, [6] = 781400, [7] = 900000, [8] = 1023100, [9] = 1137000, [10] = 1240000, [11] = 1342600, [12] = 1457500, [13] = 1575600, [14] = 1683600, }; static const unsigned int *adc_voltages[] = { [RAM_ID_HIGH_CHANNEL] = ram_voltages, [RAM_ID_LOW_CHANNEL] = ram_voltages, [SKU_ID_HIGH_CHANNEL] = ram_voltages, [SKU_ID_LOW_CHANNEL] = ram_voltages, }; static uint32_t get_adc_index(unsigned int channel) { unsigned int value = auxadc_get_voltage_uv(channel); assert(channel < ARRAY_SIZE(adc_voltages)); const unsigned 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; printk(BIOS_DEBUG, "ADC[%u]: Raw value=%u ID=%u\n", channel, value, id); return id; } uint32_t sku_id(void) { static uint32_t cached_sku_code = BOARD_ID_INIT; if (cached_sku_code == BOARD_ID_INIT) { cached_sku_code = (get_adc_index(SKU_ID_HIGH_CHANNEL) << 4 | get_adc_index(SKU_ID_LOW_CHANNEL)); printk(BIOS_DEBUG, "SKU Code: %#02x\n", cached_sku_code); } return cached_sku_code; } 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_HIGH_CHANNEL) << 4 | get_adc_index(RAM_ID_LOW_CHANNEL)); printk(BIOS_DEBUG, "RAM Code: %#02x\n", cached_ram_code); } return cached_ram_code; }