[PATCH v1 05/34] arm: socfpga: Update Agilex SPL data save and restore implementation

[alif.zakuan.yuslaimi at altera.com]

From: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi at altera.com>

Enable backup for data section to support warm reset in Agilex SPL as
no SPL image would be reloaded in warm reset.

Signed-off-by: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi at altera.com>
---
 arch/arm/mach-socfpga/spl_agilex.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm/mach-socfpga/spl_agilex.c b/arch/arm/mach-socfpga/spl_agilex.c
index faba0433838..322a7ae6fc8 100644
--- a/arch/arm/mach-socfpga/spl_agilex.c
+++ b/arch/arm/mach-socfpga/spl_agilex.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2019 Intel Corporation <www.intel.com>
+ * Copyright (C) 2025 Altera Corporation <www.altera.com>
  *
  */
 
@@ -23,11 +24,28 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+u32 reset_flag(void)
+{
+	/* Check rstmgr.stat for warm reset status */
+	u32 status = readl(SOCFPGA_RSTMGR_ADDRESS);
+
+	/* Check whether any L4 watchdogs or SDM had triggered warm reset */
+	u32 warm_reset_mask = RSTMGR_L4WD_MPU_WARMRESET_MASK;
+
+	if (status & warm_reset_mask)
+		return 0;
+
+	return 1;
+}
+
 void board_init_f(ulong dummy)
 {
 	int ret;
 	struct udevice *dev;
 
+	if (IS_ENABLED(CONFIG_XPL_BUILD))
+		spl_save_restore_data();
+
 	ret = spl_early_init();
 	if (ret)
 		hang();
-- 
2.35.3