From e6d1cb9f1fffd7e300af6d8f6731a486d6255e3f Mon Sep 17 00:00:00 2001 From: Kukjin Kim Date: Sat, 20 Aug 2011 12:18:07 +0900 Subject: 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 Acked-by: Changhwan Youn Cc: Ben Dooks Signed-off-by: Kukjin Kim --- arch/arm/plat-samsung/cpu.c | 58 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 arch/arm/plat-samsung/cpu.c (limited to 'arch/arm/plat-samsung/cpu.c') diff --git a/arch/arm/plat-samsung/cpu.c b/arch/arm/plat-samsung/cpu.c new file mode 100644 index 000000000000..81c06d44c11e --- /dev/null +++ b/arch/arm/plat-samsung/cpu.c @@ -0,0 +1,58 @@ +/* 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 +#include +#include +#include + +#include + +#include +#include + +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; +} -- cgit v1.2.3-55-g7522