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-rw-r--r--src/mainboard/google/kukui/boardid.c77
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;
}