release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/loongson/common/platform.c

   1 /*
   2  * Copyright (C) 2009 Lemote Inc.
   3  * Author: Wu Zhangjin, wuzhangjin@gmail.com
   4  *
   5  * This program is free software; you can redistribute  it and/or modify it
   6  * under  the terms of  the GNU General  Public License as published by the
   7  * Free Software Foundation;  either version 2 of the  License, or (at your
   8  * option) any later version.
   9  */
  10
  11 #include <linux/err.h>
  12 #include <linux/platform_device.h>
  13
  14 static struct platform_device loongson2_cpufreq_device = {
  15         .name = "loongson2_cpufreq",
  16         .id = -1,
  17 };
  18
  19 static int __init loongson2_cpufreq_init(void)
  20 {
  21         struct cpuinfo_mips *c = &current_cpu_data;
  22
  23         /* Only 2F revision and it's successors support CPUFreq */
  24         if ((c->processor_id & PRID_REV_MASK) >= PRID_REV_LOONGSON2F)
  25                 return platform_device_register(&loongson2_cpufreq_device);
  26
  27         return -ENODEV;
  28 }
  29
  30 arch_initcall(loongson2_cpufreq_init);