arch/arm/plat-versatile/sched-clock.c

   1 /*
   2  *  linux/arch/arm/plat-versatile/sched-clock.c
   3  *
   4  *  Copyright (C) 1999 - 2003 ARM Limited
   5  *  Copyright (C) 2000 Deep Blue Solutions Ltd
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/io.h>
  23 #include <linux/sched_clock.h>
  24
  25 #include <plat/sched_clock.h>
  26
  27 static void __iomem *ctr;
  28
  29 static u64 notrace versatile_read_sched_clock(void)
  30 {
  31         if (ctr)
  32                 return readl(ctr);
  33
  34         return 0;
  35 }
  36
  37 void __init versatile_sched_clock_init(void __iomem *reg, unsigned long rate)
  38 {
  39         ctr = reg;
  40         sched_clock_register(versatile_read_sched_clock, 32, rate);
  41 }