LXR linux/arch/arm/plat-samsung/cpu.c

   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
  22unsigned long samsung_cpu_id;
  23static unsigned int samsung_cpu_rev;
  24
  25unsigned int samsung_rev(void)
  26{
  27        return samsung_cpu_rev;
  28}
  29EXPORT_SYMBOL(samsung_rev);
  30
  31void __init s3c24xx_init_cpu(void)
  32{
  33        /* nothing here yet */
  34
  35        samsung_cpu_rev = 0;
  36}
  37
  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
  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