e6d1cb9f1f
This patch adds plat-samsung/cpu.c for detecting of cpu id and silicon revision. This patch was originally from Changhwan Youn <chaos.youn@samsung.com> Acked-by: Changhwan Youn <chaos.youn@samsung.com> Cc: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
/* linux/arch/arm/plat-samsung/cpu.c
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*
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* Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Samsung CPU Support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <asm/system.h>
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#include <mach/map.h>
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#include <plat/cpu.h>
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unsigned long samsung_cpu_id;
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static unsigned int samsung_cpu_rev;
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unsigned int samsung_rev(void)
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{
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return samsung_cpu_rev;
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}
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EXPORT_SYMBOL(samsung_rev);
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void __init s3c24xx_init_cpu(void)
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{
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/* nothing here yet */
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samsung_cpu_rev = 0;
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}
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void __init s3c64xx_init_cpu(void)
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{
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samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118);
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if (!samsung_cpu_id) {
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/*
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* S3C6400 has the ID register in a different place,
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* and needs a write before it can be read.
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*/
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__raw_writel(0x0, S3C_VA_SYS + 0xA1C);
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samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C);
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}
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samsung_cpu_rev = 0;
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}
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void __init s5p_init_cpu(void __iomem *cpuid_addr)
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{
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samsung_cpu_id = __raw_readl(cpuid_addr);
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samsung_cpu_rev = samsung_cpu_id & 0xFF;
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}
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