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/* SPDX-License-Identifier: GPL-2.0-only */
#include <assert.h>
#include <boardid.h>
#include <console/console.h>
#include <ec/google/chromeec/ec.h>
#include <soc/auxadc.h>
#include "panel.h"
/* board_id is provided by ec/google/chromeec/ec_boardid.c */
#define ADC_LEVELS 8
enum {
/* RAM IDs */
RAM_ID_LOW_CHANNEL = 2,
RAM_ID_HIGH_CHANNEL = 3,
/* PANEL IDs */
PANEL_ID_HIGH_CHANNEL = 4,
PANEL_ID_LOW_CHANNEL = 5,
};
static const unsigned int ram_voltages[] = {
/* ID : Voltage (unit: uV) */
[0] = 74296,
[1] = 211673,
[2] = 365055,
[3] = 524272,
[4] = 706302,
[5] = 899119,
[6] = 1108941,
[7] = 1342616,
};
_Static_assert(ARRAY_SIZE(ram_voltages) == ADC_LEVELS, "Wrong array size of ram_voltages");
static const unsigned int panel_voltages[] = {
/* ID : Voltage (unit: uV) */
[0] = 0,
[1] = 282774,
[2] = 472379,
[3] = 652542,
[4] = 830258,
[5] = 1011767,
[6] = 1209862,
[7] = 1427880,
};
_Static_assert(ARRAY_SIZE(panel_voltages) == ADC_LEVELS, "Wrong array size of panel_voltages");
static const unsigned int *adc_voltages[] = {
[RAM_ID_LOW_CHANNEL] = ram_voltages,
[RAM_ID_HIGH_CHANNEL] = ram_voltages,
[PANEL_ID_HIGH_CHANNEL] = panel_voltages,
[PANEL_ID_LOW_CHANNEL] = panel_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;
}
/* Returns the ID for LCD module (type of panel). */
uint32_t panel_id(void)
{
static uint32_t cached_panel_id = BOARD_ID_INIT;
if (cached_panel_id == BOARD_ID_INIT)
cached_panel_id = get_adc_index(PANEL_ID_HIGH_CHANNEL) << 4 |
get_adc_index(PANEL_ID_LOW_CHANNEL);
return cached_panel_id;
}
uint32_t sku_id(void)
{
static uint32_t cached_sku_code = BOARD_ID_INIT;
if (cached_sku_code == BOARD_ID_INIT) {
cached_sku_code = google_chromeec_get_board_sku();
if (cached_sku_code == CROS_SKU_UNKNOWN ||
cached_sku_code == CROS_SKU_UNPROVISIONED) {
printk(BIOS_WARNING, "SKU code from EC: %s\n",
(cached_sku_code == CROS_SKU_UNKNOWN) ?
"CROS_SKU_UNKNOWN" : "CROS_SKU_UNPROVISIONED");
/* Reserve last 8 bits to report PANEL_IDs */
cached_sku_code = 0x7FFFFF00UL | panel_id();
}
printk(BIOS_DEBUG, "SKU Code: %#02x\n", cached_sku_code);
}
return cached_sku_code;
}
uint32_t ram_code(void)
{
static uint32_t cached_ram_code = BOARD_ID_INIT;
if (cached_ram_code == BOARD_ID_INIT) {
cached_ram_code = (get_adc_index(RAM_ID_HIGH_CHANNEL) << 4 |
get_adc_index(RAM_ID_LOW_CHANNEL));
printk(BIOS_DEBUG, "RAM Code: %#02x\n", cached_ram_code);
}
return cached_ram_code;
}
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