mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 04:03:58 +08:00
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>
59 lines
1.2 KiB
C
59 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;
|
|
}
|