[PATCH] board: am62x: Add support for reading eeprom data

[Guillaume La Roque (TI.com)]

I2C EEPROM data contains the board name and its revision.
Add support for:
- Reading EEPROM data and store a copy at end of SRAM
- Updating env variable with relevant board info
- Printing board info during boot.

Signed-off-by: Guillaume La Roque (TI.com) <glaroque at baylibre.com>
---
 arch/arm/mach-k3/am62x/Kconfig |  3 ++
 board/ti/am62x/evm.c           | 95 +++++++++++++++++++++++++++++++++++++++++-
 configs/am62x_evm_r5_defconfig |  1 +
 3 files changed, 98 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-k3/am62x/Kconfig b/arch/arm/mach-k3/am62x/Kconfig
index 81199ada3a1..f7ad52db7d8 100644
--- a/arch/arm/mach-k3/am62x/Kconfig
+++ b/arch/arm/mach-k3/am62x/Kconfig
@@ -14,6 +14,8 @@ config TARGET_AM625_A53_EVM
 	select ARM64
 	select BINMAN
 	select OF_SYSTEM_SETUP
+	imply TI_COMMON_CMD_OPTIONS
+	imply TI_I2C_BOARD_DETECT
 
 config TARGET_AM625_R5_EVM
 	bool "TI K3 based AM625 EVM running on R5"
@@ -25,6 +27,7 @@ config TARGET_AM625_R5_EVM
 	select K3_DDRSS
 	select BINMAN
 	imply SYS_K3_SPL_ATF
+	imply TI_I2C_BOARD_DETECT
 
 config TARGET_PHYCORE_AM62X_A53
 	bool "PHYTEC phyCORE-AM62x running on A53"
diff --git a/board/ti/am62x/evm.c b/board/ti/am62x/evm.c
index d7b07a0d34d..fbd45608efa 100644
--- a/board/ti/am62x/evm.c
+++ b/board/ti/am62x/evm.c
@@ -22,8 +22,18 @@
 #include <dm/uclass.h>
 #include <asm/arch/k3-ddr.h>
 
+#include "../common/board_detect.h"
 #include "../common/fdt_ops.h"
 
+#include "../common/k3-ddr.h"
+
+#define board_is_am62x_skevm()  (board_ti_k3_is("AM62-SKEVM") || \
+				 board_ti_k3_is("AM62B-SKEVM"))
+#define board_is_am62b_p1_skevm() board_ti_k3_is("AM62B-SKEVM-P1")
+#define board_is_am62x_lp_skevm()  board_ti_k3_is("AM62-LP-SKEVM")
+#define board_is_am62x_sip_skevm()  board_ti_k3_is("AM62SIP-SKEVM")
+#define board_is_am62x_play()	board_ti_k3_is("BEAGLEPLAY-A0-")
+
 DECLARE_GLOBAL_DATA_PTR;
 
 #if CONFIG_IS_ENABLED(SPLASH_SCREEN)
@@ -74,9 +84,92 @@ struct efi_capsule_update_info update_info = {
 	.images = fw_images,
 };
 
-#ifdef CONFIG_BOARD_LATE_INIT
+#if CONFIG_IS_ENABLED(TI_I2C_BOARD_DETECT)
+int do_board_detect(void)
+{
+	int ret;
+
+	ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
+					 CONFIG_EEPROM_CHIP_ADDRESS);
+	if (ret) {
+		printf("EEPROM not available at 0x%02x, trying to read at 0x%02x\n",
+		       CONFIG_EEPROM_CHIP_ADDRESS, CONFIG_EEPROM_CHIP_ADDRESS + 1);
+		ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
+						 CONFIG_EEPROM_CHIP_ADDRESS + 1);
+		if (ret)
+			pr_err("Reading on-board EEPROM at 0x%02x failed %d\n",
+			       CONFIG_EEPROM_CHIP_ADDRESS + 1, ret);
+	}
+
+	return ret;
+}
+
+int checkboard(void)
+{
+	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
+
+	if (!do_board_detect())
+		printf("Board: %s rev %s\n", ep->name, ep->version);
+
+	return 0;
+}
+
+#if CONFIG_IS_ENABLED(BOARD_LATE_INIT)
+static void setup_board_eeprom_env(void)
+{
+	char *name = "am62x_skevm";
+
+	if (do_board_detect())
+		goto invalid_eeprom;
+
+	if (board_is_am62x_skevm())
+		name = "am62x_skevm";
+	else if (board_is_am62b_p1_skevm())
+		name = "am62b_p1_skevm";
+	else if (board_is_am62x_lp_skevm())
+		name = "am62x_lp_skevm";
+	else if (board_is_am62x_sip_skevm())
+		name = "am62x_sip_skevm";
+	else if (board_is_am62x_play())
+		name = "am62x_beagleplay";
+	else
+		printf("Unidentified board claims %s in eeprom header\n",
+		       board_ti_get_name());
+
+invalid_eeprom:
+	set_board_info_env_am6(name);
+}
+
+static void setup_serial(void)
+{
+	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
+	unsigned long board_serial;
+	char *endp;
+	char serial_string[17] = { 0 };
+
+	if (env_get("serial#"))
+		return;
+
+	board_serial = simple_strtoul(ep->serial, &endp, 16);
+	if (*endp != '\0') {
+		pr_err("Error: Can't set serial# to %s\n", ep->serial);
+		return;
+	}
+
+	snprintf(serial_string, sizeof(serial_string), "%016lx", board_serial);
+	env_set("serial#", serial_string);
+}
+#endif
+#endif
+
+#if CONFIG_IS_ENABLED(BOARD_LATE_INIT)
 int board_late_init(void)
 {
+	if (IS_ENABLED(CONFIG_TI_I2C_BOARD_DETECT)) {
+		setup_board_eeprom_env();
+		setup_serial();
+	}
+
 	ti_set_fdt_env(NULL, NULL);
 	return 0;
 }
diff --git a/configs/am62x_evm_r5_defconfig b/configs/am62x_evm_r5_defconfig
index 18ffc991b25..d42bdf1f074 100644
--- a/configs/am62x_evm_r5_defconfig
+++ b/configs/am62x_evm_r5_defconfig
@@ -85,6 +85,7 @@ CONFIG_SPL_CLK_K3_PLL=y
 CONFIG_SPL_CLK_K3=y
 CONFIG_TI_SCI_PROTOCOL=y
 CONFIG_DA8XX_GPIO=y
+CONFIG_DM_I2C=y
 CONFIG_DM_MAILBOX=y
 CONFIG_K3_SEC_PROXY=y
 CONFIG_SPL_MISC=y

---
base-commit: 2ba64e303b2706e5c42a6bf982326d632342ca66
change-id: 20251016-am62xeeprom-41a1920b8bd2

Best regards,
-- 
Guillaume La Roque (TI.com) <glaroque at baylibre.com>