mb/google/kukui: Support SKU from camera EEPROM

To support camera second source GC5035 for kodama, add world facing
camera id as part of the sku id, which is determined by the data in
camera EEPROM. For models other than kodama, the camera id is always 0
and hence the sku id is unchanged.

BUG=b:144820097
TEST=emerge-kukui coreboot
TEST=Correct WFC id detected for kodama with GC5035 camera
BRANCH=kukui

Change-Id: I63a2b952b8c35c0ead8200d7c926e8d90a9f3fb8
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45811
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/kukui/Kconfig

@@ -23,6 +23,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select SOC_MEDIATEK_MT8183
 	select BOARD_ROMSIZE_KB_8192
 	select MAINBOARD_HAS_CHROMEOS
+	select CHROMEOS_CAMERA
 	select CHROMEOS_USE_EC_WATCHDOG_FLAG if CHROMEOS
 	select COMMON_CBFS_SPI_WRAPPER
 	select SPI_FLASH

src/mainboard/google/kukui/Makefile.inc

@@ -1,7 +1,6 @@
 subdirs-y += sdram_params/
 subdirs-y += panel_params/
 
-bootblock-y += boardid.c
 bootblock-y += bootblock.c
 bootblock-y += reset.c
 

src/mainboard/google/kukui/boardid.c

@@ -3,8 +3,14 @@
 #include <assert.h>
 #include <boardid.h>
 #include <console/console.h>
-#include <soc/auxadc.h>
+#include <delay.h>
+#include <device/i2c_simple.h>
+#include <drivers/camera/cros_camera.h>
 #include <ec/google/chromeec/ec.h>
+#include <soc/auxadc.h>
+#include <soc/i2c.h>
+#include <soc/pmic_wrap_common.h>
+#include <string.h>
 
 /* For CBI un-provisioned/corrupted Flapjack board. */
 #define FLAPJACK_UNDEF_SKU_ID 0
@@ -72,6 +78,97 @@ static uint32_t get_adc_index(unsigned int channel)
 	return id;
 }
 
+static uint8_t eeprom_random_read(uint8_t bus, uint8_t slave, uint16_t offset,
+				  uint8_t *data, uint16_t len)
+{
+	struct i2c_msg seg[2];
+	uint8_t address[2];
+
+	address[0] = offset >> 8;
+	address[1] = offset & 0xff;
+
+	seg[0].flags = 0;
+	seg[0].slave = slave;
+	seg[0].buf   = address;
+	seg[0].len   = sizeof(address);
+	seg[1].flags = I2C_M_RD;
+	seg[1].slave = slave;
+	seg[1].buf   = data;
+	seg[1].len   = len;
+
+	return i2c_transfer(bus, seg, ARRAY_SIZE(seg));
+}
+
+/* Regulator for world facing camera. */
+#define PMIC_LDO_VCAMIO_CON0 0x1cb0
+
+#define CROS_CAMERA_INFO_OFFSET 0x1f80
+#define MT8183_FORMAT 0x8183
+#define KODAMA_PID 0x00c7
+
+/* Returns the ID for world facing camera. */
+static uint8_t wfc_id(void)
+{
+	if (!CONFIG(BOARD_GOOGLE_KODAMA))
+		return 0;
+
+	int i, ret;
+	uint8_t bus = 2;
+	uint8_t dev_addr = 0x50;  /* at24c32/64 device address */
+
+	struct cros_camera_info data = {0};
+
+	const uint16_t sensor_pids[] = {
+		[0] = 0x5965,  /* OV5965 */
+		[1] = 0x5035,  /* GC5035 */
+	};
+
+	mtk_i2c_bus_init(bus);
+
+	/* Turn on camera sensor EEPROM */
+	pwrap_write(PMIC_LDO_VCAMIO_CON0, 0x1);
+	udelay(270);
+
+	ret = eeprom_random_read(bus, dev_addr, CROS_CAMERA_INFO_OFFSET,
+				 (uint8_t *)&data, sizeof(data));
+	pwrap_write(PMIC_LDO_VCAMIO_CON0, 0x0);
+
+	if (ret) {
+		printk(BIOS_ERR,
+		       "Failed to read from EEPROM; using default WFC id 0\n");
+		return 0;
+	}
+
+	if (check_cros_camera_info(&data)) {
+		printk(BIOS_ERR,
+		       "Failed to check camera info; using default WFC id 0\n");
+		return 0;
+	}
+
+	if (data.data_format != MT8183_FORMAT) {
+		printk(BIOS_ERR, "Incompatible camera format: %#04x\n",
+		       data.data_format);
+		return 0;
+	}
+	if (data.module_pid != KODAMA_PID) {
+		printk(BIOS_ERR, "Incompatible module pid: %#04x\n",
+		       data.module_pid);
+		return 0;
+	}
+
+	printk(BIOS_DEBUG, "Camera sensor pid: %#04x\n", data.sensor_pid);
+
+	for (i = 0; i < ARRAY_SIZE(sensor_pids); i++) {
+		if (data.sensor_pid == sensor_pids[i]) {
+			printk(BIOS_INFO, "Detected WFC id: %d\n", i);
+			return i;
+		}
+	}
+
+	printk(BIOS_WARNING, "Unknown WFC id; using default id 0\n");
+	return 0;
+}
+
 /* board_id is provided by ec/google/chromeec/ec_boardid.c */
 
 uint32_t sku_id(void)
@@ -98,11 +195,14 @@ uint32_t sku_id(void)
 
 	/*
 	 * The SKU (later used for device tree matching) is combined from:
+	 * World facing camera (WFC) ID.
 	 * 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 |
+	cached_sku_id = (wfc_id() << 8 |
+			 get_adc_index(LCM_ID_CHANNEL) << 4 |
 			 get_adc_index(SKU_ID_CHANNEL));
+
 	return cached_sku_id;
 }