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/smp.h>
  13 #include <linux/platform_device.h>
  14
  15 static struct platform_device loongson2_cpufreq_device = {
  16         .name = "loongson2_cpufreq",
  17         .id = -1,
  18 };
  19
  20 static int __init loongson2_cpufreq_init(void)
  21 {
  22         struct cpuinfo_mips *c = &current_cpu_data;
  23
  24         /* Only 2F revision and it's successors support CPUFreq */
  25         if ((c->processor_id & PRID_REV_MASK) >= PRID_REV_LOONGSON2F)
  26                 return platform_device_register(&loongson2_cpufreq_device);
  27
  28         return -ENODEV;
  29 }
  30
  31 arch_initcall(loongson2_cpufreq_init);