| /* 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; |
| } |