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-rw-r--r--src/mainboard/google/asurada/boardid.c57
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;
}