diff options
Diffstat (limited to 'src/mainboard/google/kukui')
| -rw-r--r-- | src/mainboard/google/kukui/boardid.c | 77 |
1 files changed, 58 insertions, 19 deletions
diff --git a/src/mainboard/google/kukui/boardid.c b/src/mainboard/google/kukui/boardid.c index ff910fe3e5..b9f1ba2226 100644 --- a/src/mainboard/google/kukui/boardid.c +++ b/src/mainboard/google/kukui/boardid.c @@ -22,9 +22,15 @@ /* For CBI un-provisioned/corrupted Flapjack board. */ #define FLAPJACK_UNDEF_SKU_ID 0 -static uint32_t get_index(unsigned int channel, uint32_t *cached_id) -{ - static const int voltages[] = { +#define ADC_LEVELS 12 + +enum { + LCM_ID_CHANNEL = 2, /* ID of LCD Module on schematics. */ + RAM_ID_CHANNEL = 3, + SKU_ID_CHANNEL = 4, +}; + +static const int ram_voltages[ADC_LEVELS] = { /* ID : Voltage (unit: uV) */ /* 0 : */ 74000, /* 1 : */ 212000, @@ -38,27 +44,47 @@ static uint32_t get_index(unsigned int channel, uint32_t *cached_id) /* 9 : */ 1137000, /* 10 : */ 1240000, /* 11 : */ 1343000, - /* 12 : */ 1457000, - /* 13 : */ 1576000, - /* 14 : */ 1684000, - /* 15 : */ 1800000, - }; +}; - uint32_t id; +static const int lcm_voltages[ADC_LEVELS] = { + /* ID : Voltage (unit: uV) */ + /* 0 : */ 0, + /* 1 : */ 283000, + /* 2 : */ 440000, + /* 3 : */ 503000, + /* 4 : */ 608000, + /* 5 : */ 703000, + /* 6 : */ 830000, + /* 7 : */ 865000, + /* 8 : */ 953000, + /* 9 : */ 1079000, + /* 10 : */ 1128000, + /* 11 : */ 1434000, +}; - if (*cached_id != BOARD_ID_INIT) - return *cached_id; +static const int *adc_voltages[] = { + [LCM_ID_CHANNEL] = lcm_voltages, + [RAM_ID_CHANNEL] = ram_voltages, + [SKU_ID_CHANNEL] = ram_voltages, /* SKU ID is sharing RAM voltages. */ +}; +static uint32_t get_adc_index(unsigned int channel) +{ int value = auxadc_get_voltage(channel); + + assert(channel < ARRAY_SIZE(adc_voltages)); + const int *voltages = adc_voltages[channel]; + assert(voltages); + /* Find the closest voltage */ - for (id = 0; id < ARRAY_SIZE(voltages) - 1; id++) + uint32_t id; + for (id = 0; id < ADC_LEVELS - 1; id++) if (value < (voltages[id] + voltages[id + 1]) / 2) break; const int tolerance = 10000; /* 10,000 uV */ assert(ABS(value - voltages[id]) < tolerance); - *cached_id = id; return id; } @@ -68,26 +94,39 @@ uint32_t sku_id(void) { static uint32_t cached_sku_id = BOARD_ID_INIT; + if (cached_sku_id != BOARD_ID_INIT) + return cached_sku_id; + /* On Flapjack, getting the SKU via CBI. */ if (CONFIG(BOARD_GOOGLE_FLAPJACK)) { - if (cached_sku_id == BOARD_ID_INIT && - google_chromeec_cbi_get_sku_id(&cached_sku_id)) + if (google_chromeec_cbi_get_sku_id(&cached_sku_id)) cached_sku_id = FLAPJACK_UNDEF_SKU_ID; return cached_sku_id; } - /* Quirk for KUKUI: All P1/SKU0 had incorrectly set SKU=1. */ + /* Quirk for Kukui: All Rev1/Sku0 had incorrectly set SKU_ID=1. */ if (CONFIG(BOARD_GOOGLE_KUKUI)) { - if (cached_sku_id == BOARD_ID_INIT && board_id() == 1) { + if (board_id() == 1) { cached_sku_id = 0; return cached_sku_id; } } - return get_index(4, &cached_sku_id); + + /* + * The SKU (later used for device tree matching) is combined from: + * ADC2[4bit/H] = straps on LCD module (type of panel). + * ADC4[4bit/L] = SKU ID from board straps. + */ + cached_sku_id = (get_adc_index(LCM_ID_CHANNEL) << 4 | + get_adc_index(SKU_ID_CHANNEL)); + return cached_sku_id; } uint32_t ram_code(void) { static uint32_t cached_ram_code = BOARD_ID_INIT; - return get_index(3, &cached_ram_code); + + if (cached_ram_code == BOARD_ID_INIT) + cached_ram_code = get_adc_index(RAM_ID_CHANNEL); + return cached_ram_code; } |