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 19 #include <mach/map.h> 20 #include <plat/cpu.h> 21 22 unsigned long samsung_cpu_id; 23 static unsigned int samsung_cpu_rev; 24 samsung_rev(void)25unsigned int samsung_rev(void) 26 { 27 return samsung_cpu_rev; 28 } 29 EXPORT_SYMBOL(samsung_rev); 30 s3c24xx_init_cpu(void)31void __init s3c24xx_init_cpu(void) 32 { 33 /* nothing here yet */ 34 35 samsung_cpu_rev = 0; 36 } 37 s3c64xx_init_cpu(void)38void __init s3c64xx_init_cpu(void) 39 { 40 samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118); 41 if (!samsung_cpu_id) { 42 /* 43 * S3C6400 has the ID register in a different place, 44 * and needs a write before it can be read. 45 */ 46 __raw_writel(0x0, S3C_VA_SYS + 0xA1C); 47 samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C); 48 } 49 50 samsung_cpu_rev = 0; 51 } 52 s5p_init_cpu(void __iomem * cpuid_addr)53void __init s5p_init_cpu(void __iomem *cpuid_addr) 54 { 55 samsung_cpu_id = __raw_readl(cpuid_addr); 56 samsung_cpu_rev = samsung_cpu_id & 0xFF; 57 } 58