arch/blackfin/oprofile/timer_int.c

   1 /*
   2  * File:         arch/blackfin/oprofile/timer_int.c
   3  * Based on:
   4  * Author:       Michael Kang
   5  *
   6  * Created:
   7  * Description:
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/init.h>
  31 #include <linux/smp.h>
  32 #include <linux/irq.h>
  33 #include <linux/oprofile.h>
  34 #include <linux/ptrace.h>
  35
  36 static void enable_sys_timer0()
  37 {
  38 }
  39 static void disable_sys_timer0()
  40 {
  41 }
  42
  43 static irqreturn_t sys_timer0_int_handler(int irq, void *dev_id,
  44                                           struct pt_regs *regs)
  45 {
  46         oprofile_add_sample(regs, 0);
  47         return IRQ_HANDLED;
  48 }
  49
  50 static int sys_timer0_start(void)
  51 {
  52         enable_sys_timer0();
  53         return request_irq(IVG11, sys_timer0_int_handler, 0, "sys_timer0", NULL);
  54 }
  55
  56 static void sys_timer0_stop(void)
  57 {
  58         disable_sys_timer();
  59 }
  60
  61 int __init sys_timer0_init(struct oprofile_operations *ops)
  62 {
  63         extern int nmi_active;
  64
  65         if (nmi_active <= 0)
  66                 return -ENODEV;
  67
  68         ops->start = timer_start;
  69         ops->stop = timer_stop;
  70         ops->cpu_type = "timer";
  71         printk(KERN_INFO "oprofile: using NMI timer interrupt.\n");
  72         return 0;
  73 }