diff options
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/google/gru/boardid.c | 60 | ||||
| -rw-r--r-- | src/mainboard/google/gru/sdram_configs.c | 6 |
2 files changed, 33 insertions, 33 deletions
diff --git a/src/mainboard/google/gru/boardid.c b/src/mainboard/google/gru/boardid.c index b0c1eaf17e..eb1c3780a2 100644 --- a/src/mainboard/google/gru/boardid.c +++ b/src/mainboard/google/gru/boardid.c @@ -19,43 +19,49 @@ #include <soc/saradc.h> /* - * This matches Kevin/Gru ADC value for board id. + * ID info: + * ID : Volts : ADC value : Bucket + * == ===== ========= ====== + * 0 : 0.074V: 37.888 : 0 - <=82 + * 1 : 0.211V: 108.032 : 82- <=136 + * 2 : 0.319V: 163.328 : 136-<=191 + * 3 : 0.427V: 218.624 : 191-<=248 + * 4 : 0.542V: 277.504 : 248-<=309 + * 5 : 0.666V: 340.992 : 309-<=370 + * 6 : 0.781V: 399.872 : 370- 512 */ -static const int board_id_readings[] = { 42, 120, 181, 242, 307, 378, 444, - 511, 581, 646, 704, 763, 828, - 895, 956, 1023 }; +static const int id_readings[] = { 82, 136, 191, 248, 309, 370, 512 }; +static int cached_board_id = -1; +static int cached_ram_id = -1; -/* - * The ADC produces a 10 bit value, the resistor accuracy is 1%, let's leave - * 2% room for error on both sides, total variation would be 4%, which is - * approximately 40 points with a 10 bit ADC. The hardware specification - * guarantees valid readings to be at least 64 bits (2^6) apart. - */ -#define ACCEPTABLE_DELTA (int)(1024 * .02) - -uint8_t board_id(void) +static uint32_t get_index(uint32_t channel, int *cached_id) { - static int cached_board_id = -1; int i; int adc_reading; - if (cached_board_id != -1) - return cached_board_id; - - adc_reading = get_saradc_value(1); - for (i = 0; i < ARRAY_SIZE(board_id_readings); i++) { - int delta = board_id_readings[i] - adc_reading; + if (*cached_id != -1) + return *cached_id; - if ((delta < ACCEPTABLE_DELTA) && (delta > -ACCEPTABLE_DELTA)) { - printk(BIOS_DEBUG, "ADC reading %d, " - "expected value %d board ID %d\n", - adc_reading, delta + adc_reading, i); - cached_board_id = i; + 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; } } - printk(BIOS_ERR, "Unmatched ADC reading of %d, using Board ID of 0\n", - adc_reading); + printk(BIOS_DEBUG, "ERROR: Unmatched ADC reading of %d\n", adc_reading); return 0; } + +uint8_t board_id(void) +{ + return get_index(1, &cached_board_id); +} + +uint32_t ram_code(void) +{ + return get_index(0, &cached_ram_id); +} diff --git a/src/mainboard/google/gru/sdram_configs.c b/src/mainboard/google/gru/sdram_configs.c index f1f889c334..562055d158 100644 --- a/src/mainboard/google/gru/sdram_configs.c +++ b/src/mainboard/google/gru/sdram_configs.c @@ -58,9 +58,3 @@ const struct rk3399_sdram_params *get_sdram_config() return &sdram_configs[speed]; } - - -uint32_t ram_code(void) -{ - return get_sdram_index(); -} |