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 <asm/system.h>
19 
20 #include <mach/map.h>
21 #include <plat/cpu.h>
22 
23 unsigned long samsung_cpu_id;
24 static unsigned int samsung_cpu_rev;
25 
samsung_rev(void)26 unsigned int samsung_rev(void)
27 {
28 	return samsung_cpu_rev;
29 }
30 EXPORT_SYMBOL(samsung_rev);
31 
s3c24xx_init_cpu(void)32 void __init s3c24xx_init_cpu(void)
33 {
34 	/* nothing here yet */
35 
36 	samsung_cpu_rev = 0;
37 }
38 
s3c64xx_init_cpu(void)39 void __init s3c64xx_init_cpu(void)
40 {
41 	samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118);
42 	if (!samsung_cpu_id) {
43 		/*
44 		 * S3C6400 has the ID register in a different place,
45 		 * and needs a write before it can be read.
46 		 */
47 		__raw_writel(0x0, S3C_VA_SYS + 0xA1C);
48 		samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C);
49 	}
50 
51 	samsung_cpu_rev = 0;
52 }
53 
s5p_init_cpu(void __iomem * cpuid_addr)54 void __init s5p_init_cpu(void __iomem *cpuid_addr)
55 {
56 	samsung_cpu_id = __raw_readl(cpuid_addr);
57 	samsung_cpu_rev = samsung_cpu_id & 0xFF;
58 }
59