From: Udit Kumar <u-kumar1@ti.com>
Date: Wed, 15 Apr 2026 15:21:50 +0000 (+0530)
Subject: arm: mach-k3: arm: mach-k3: Add writel_verify macro for register write verification
X-Git-Tag: v2026.07-rc2~2^2~2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ad681c816484c2246b4803de64553f760c0f44cd;p=thirdparty%2Fu-boot.git

arm: mach-k3: arm: mach-k3: Add writel_verify macro for register write verification

Add a helper macro to write and verify a 32-bit value to a memory-mapped
register. This is essential for hardware errata workarounds that require
confirmation that register writes have taken effect before proceeding with
initialization.

Signed-off-by: Udit Kumar <u-kumar1@ti.com>
---

diff --git a/arch/arm/mach-k3/include/mach/hardware.h b/arch/arm/mach-k3/include/mach/hardware.h
index 81b5f1fa45e..b337a71956f 100644
--- a/arch/arm/mach-k3/include/mach/hardware.h
+++ b/arch/arm/mach-k3/include/mach/hardware.h
@@ -126,4 +126,14 @@ struct rom_extended_boot_data {
 
 u32 get_boot_device(void);
 const char *get_reset_reason(void);
+
+#define writel_verify(val, addr) \
+do { \
+	u32 readback; \
+	writel(val, addr); \
+	readback = readl(addr); \
+	if (readback != val) \
+		printf("writel_verify failed: addr=0x%p, expected=0x%x, got=0x%x\n", \
+		       (void *)(addr), (val), readback); \
+} while (0)
 #endif /* _ASM_ARCH_HARDWARE_H_ */