1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/cpu.c b/arch/arm/plat-samsung/cpu.c
new file mode 100644
index 000000000..e1ba88ba3
--- /dev/null
+++ b/arch/arm/plat-samsung/cpu.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
+//		http://www.samsung.com
+//
+// Samsung CPU Support
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <plat/map-base.h>
+#include <plat/cpu.h>
+
+unsigned long samsung_cpu_id;
+static unsigned int samsung_cpu_rev;
+
+unsigned int samsung_rev(void)
+{
+	return samsung_cpu_rev;
+}
+EXPORT_SYMBOL(samsung_rev);
+
+void __init s3c64xx_init_cpu(void)
+{
+	samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0x118);
+	if (!samsung_cpu_id) {
+		/*
+		 * S3C6400 has the ID register in a different place,
+		 * and needs a write before it can be read.
+		 */
+		writel_relaxed(0x0, S3C_VA_SYS + 0xA1C);
+		samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0xA1C);
+	}
+
+	samsung_cpu_rev = 0;
+
+	pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
+}
+
+void __init s5p_init_cpu(const void __iomem *cpuid_addr)
+{
+	samsung_cpu_id = readl_relaxed(cpuid_addr);
+	samsung_cpu_rev = samsung_cpu_id & 0xFF;
+
+	pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
+}