1/* linux/arch/arm/plat-samsung/cpu.c
2 *
3 * Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
4 *		http://www.samsung.com
5 *
6 * Samsung CPU Support
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11*/
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/io.h>
17
18#include <plat/map-base.h>
19#include <plat/cpu.h>
20
21unsigned long samsung_cpu_id;
22static unsigned int samsung_cpu_rev;
23
24unsigned int samsung_rev(void)
25{
26	return samsung_cpu_rev;
27}
28EXPORT_SYMBOL(samsung_rev);
29
30void __init s3c64xx_init_cpu(void)
31{
32	samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118);
33	if (!samsung_cpu_id) {
34		/*
35		 * S3C6400 has the ID register in a different place,
36		 * and needs a write before it can be read.
37		 */
38		__raw_writel(0x0, S3C_VA_SYS + 0xA1C);
39		samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C);
40	}
41
42	samsung_cpu_rev = 0;
43
44	pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
45}
46
47void __init s5p_init_cpu(void __iomem *cpuid_addr)
48{
49	samsung_cpu_id = __raw_readl(cpuid_addr);
50	samsung_cpu_rev = samsung_cpu_id & 0xFF;
51
52	pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
53}
54