LXR linux/arch/mips/ar7/time.c

   1/*
   2 * Carsten Langgaard, carstenl@mips.com
   3 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   4 *
   5 *  This program is free software; you can distribute it and/or modify it
   6 *  under the terms of the GNU General Public License (Version 2) as
   7 *  published by the Free Software Foundation.
   8 *
   9 *  This program is distributed in the hope it will be useful, but WITHOUT
  10 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 *  for more details.
  13 *
  14 *  You should have received a copy of the GNU General Public License along
  15 *  with this program; if not, write to the Free Software Foundation, Inc.,
  16 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  17 *
  18 * Setting up the clock on the MIPS boards.
  19 */
  20
  21#include <linux/init.h>
  22#include <linux/time.h>
  23#include <linux/err.h>
  24#include <linux/clk.h>
  25
  26#include <asm/time.h>
  27#include <asm/mach-ar7/ar7.h>
  28
  29void __init plat_time_init(void)
  30{
  31        struct clk *cpu_clk;
  32
  33        /* Initialize ar7 clocks so the CPU clock frequency is correct */
  34        ar7_init_clocks();
  35
  36        cpu_clk = clk_get(NULL, "cpu");
  37        if (IS_ERR(cpu_clk)) {
  38                printk(KERN_ERR "unable to get cpu clock\n");
  39                return;
  40        }
  41
  42        mips_hpt_frequency = clk_get_rate(cpu_clk) / 2;
  43}
  44