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