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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 | ||
aa42587a | 18 | #include <plat/map-base.h> |
e6d1cb9f KK |
19 | #include <plat/cpu.h> |
20 | ||
21 | unsigned long samsung_cpu_id; | |
22 | static unsigned int samsung_cpu_rev; | |
23 | ||
24 | unsigned int samsung_rev(void) | |
25 | { | |
26 | return samsung_cpu_rev; | |
27 | } | |
28 | EXPORT_SYMBOL(samsung_rev); | |
29 | ||
e6d1cb9f KK |
30 | void __init s3c64xx_init_cpu(void) |
31 | { | |
f4c24f36 | 32 | samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0x118); |
e6d1cb9f KK |
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 | */ | |
f4c24f36 BD |
38 | writel_relaxed(0x0, S3C_VA_SYS + 0xA1C); |
39 | samsung_cpu_id = readl_relaxed(S3C_VA_SYS + 0xA1C); | |
e6d1cb9f KK |
40 | } |
41 | ||
42 | samsung_cpu_rev = 0; | |
1a14f532 OJ |
43 | |
44 | pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id); | |
e6d1cb9f KK |
45 | } |
46 | ||
9251e1d6 | 47 | void __init s5p_init_cpu(const void __iomem *cpuid_addr) |
e6d1cb9f | 48 | { |
f4c24f36 | 49 | samsung_cpu_id = readl_relaxed(cpuid_addr); |
e6d1cb9f | 50 | samsung_cpu_rev = samsung_cpu_id & 0xFF; |
1a14f532 OJ |
51 | |
52 | pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id); | |
e6d1cb9f | 53 | } |