linux/arch/arm/plat-samsung/cpu.c
Olof Johansson 1a14f53271 ARM: SAMSUNG: print CPU id on probe
It's useful to get the CPU ID/rev printed during boot sometimes, so
add a line with that information. Given that the fields have moved
within the register over time, don't try to be clever and parse it --
just print the raw values for now.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
2014-12-23 00:19:52 +09:00

54 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 <plat/map-base.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 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;
pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
}
void __init s5p_init_cpu(void __iomem *cpuid_addr)
{
samsung_cpu_id = __raw_readl(cpuid_addr);
samsung_cpu_rev = samsung_cpu_id & 0xFF;
pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
}