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e6d1cb9f KK |
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 | ||
e6d1cb9f KK |
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 | ||
25 | unsigned int samsung_rev(void) | |
26 | { | |
27 | return samsung_cpu_rev; | |
28 | } | |
29 | EXPORT_SYMBOL(samsung_rev); | |
30 | ||
31 | void __init s3c24xx_init_cpu(void) | |
32 | { | |
33 | /* nothing here yet */ | |
34 | ||
35 | samsung_cpu_rev = 0; | |
36 | } | |
37 | ||
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 | ||
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 | } |