Change in coreboot[master]: mb/google/asurada: get SKU ID from AP strapping pins

[Hung-Te Lin (Code Review)]

Hung-Te Lin has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/51405 )

Change subject: mb/google/asurada: get SKU ID from AP strapping pins
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mb/google/asurada: get SKU ID from AP strapping pins

The SKU ID for Asurada should come from AP ADC channel 5 and 6.

BUG=None
TEST=make; boots on asurada

Change-Id: I6a00c555f20aca4cd7f8bcee46ee81c17ef6ca3c
Signed-off-by: Hung-Te Lin 
---
M src/mainboard/google/asurada/boardid.c
1 file changed, 12 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/05/51405/1

diff --git a/src/mainboard/google/asurada/boardid.c b/src/mainboard/google/asurada/boardid.c
index 06c21ec..33f71a9 100644
--- a/src/mainboard/google/asurada/boardid.c
+++ b/src/mainboard/google/asurada/boardid.c
@@ -12,6 +12,9 @@
 enum {
    RAM_ID_HIGH_CHANNEL = 4,
    RAM_ID_LOW_CHANNEL = 3,
+
+	SKU_ID_HIGH_CHANNEL = 6,
+	SKU_ID_LOW_CHANNEL = 5,
 };

static const unsigned int ram_voltages[ADC_LEVELS] = {
@@ -58,7 +61,15 @@

uint32_t sku_id(void)
 {
-	return 0;
+	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)