1 /* linux/arch/arm/plat-samsung/cpu.c 2 * 3 * Copyright (c) 2009-2011 Samsung Electronics Co., Ltd. 4 * http://www.samsung.com 5 * 6 * Samsung CPU Support 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/init.h> 16 #include <linux/io.h> 17 18 #include <plat/map-base.h> 19 #include <plat/cpu.h> 20 21 unsigned long samsung_cpu_id; 22 static unsigned int samsung_cpu_rev; 23 samsung_rev(void)24unsigned int samsung_rev(void) 25 { 26 return samsung_cpu_rev; 27 } 28 EXPORT_SYMBOL(samsung_rev); 29 s3c64xx_init_cpu(void)30void __init s3c64xx_init_cpu(void) 31 { 32 samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118); 33 if (!samsung_cpu_id) { 34 /* 35 * S3C6400 has the ID register in a different place, 36 * and needs a write before it can be read. 37 */ 38 __raw_writel(0x0, S3C_VA_SYS + 0xA1C); 39 samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C); 40 } 41 42 samsung_cpu_rev = 0; 43 } 44 s5p_init_cpu(void __iomem * cpuid_addr)45void __init s5p_init_cpu(void __iomem *cpuid_addr) 46 { 47 samsung_cpu_id = __raw_readl(cpuid_addr); 48 samsung_cpu_rev = samsung_cpu_id & 0xFF; 49 } 50