1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
4 //		http://www.samsung.com
5 //
6 // Samsung CPU Support
7 
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/io.h>
12 
13 #include <mach/map-base.h>
14 #include "cpu.h"
15 
16 unsigned long samsung_cpu_id;
17 
s3c64xx_init_cpu(void)18 void __init s3c64xx_init_cpu(void)
19 {
20 	samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0x118);
21 	if (!samsung_cpu_id) {
22 		/*
23 		 * S3C6400 has the ID register in a different place,
24 		 * and needs a write before it can be read.
25 		 */
26 		writel_relaxed(0x0, S3C_VA_SYS + 0xA1C);
27 		samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0xA1C);
28 	}
29 
30 	pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
31 }
32