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
  29 void __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 }