diff options
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/google/asurada/boardid.c | 57 |
1 files changed, 56 insertions, 1 deletions
diff --git a/src/mainboard/google/asurada/boardid.c b/src/mainboard/google/asurada/boardid.c index 2c8efcddd8..cb91812bbf 100644 --- a/src/mainboard/google/asurada/boardid.c +++ b/src/mainboard/google/asurada/boardid.c @@ -1,9 +1,59 @@ /* 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_ID_CHANNEL = 3, +}; + +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_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) { return 0; @@ -11,5 +61,10 @@ uint32_t sku_id(void) uint32_t ram_code(void) { - return 0; + static uint32_t cached_ram_code = BOARD_ID_INIT; + + if (cached_ram_code == BOARD_ID_INIT) + cached_ram_code = get_adc_index(RAM_ID_CHANNEL); + + return cached_ram_code; } |