linux/arch/arm/plat-samsung/cpu.c
Kukjin Kim e6d1cb9f1f ARM: SAMSUNG: Add support for handling of cpu revision
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>
2011-08-24 19:25:19 +09:00

58 lines
1.2 KiB
C

/* linux/arch/arm/plat-samsung/cpu.c
*
* Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Samsung CPU Support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <asm/system.h>
#include <mach/map.h>
#include <plat/cpu.h>
unsigned long samsung_cpu_id;
static unsigned int samsung_cpu_rev;
unsigned int samsung_rev(void)
{
return samsung_cpu_rev;
}
EXPORT_SYMBOL(samsung_rev);
void __init s3c24xx_init_cpu(void)
{
/* nothing here yet */
samsung_cpu_rev = 0;
}
void __init s3c64xx_init_cpu(void)
{
samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118);
if (!samsung_cpu_id) {
/*
* S3C6400 has the ID register in a different place,
* and needs a write before it can be read.
*/
__raw_writel(0x0, S3C_VA_SYS + 0xA1C);
samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C);
}
samsung_cpu_rev = 0;
}
void __init s5p_init_cpu(void __iomem *cpuid_addr)
{
samsung_cpu_id = __raw_readl(cpuid_addr);
samsung_cpu_rev = samsung_cpu_id & 0xFF;
}