linux/arch/blackfin/oprofile/timer_int.c
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   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
  36static void enable_sys_timer0()
  37{
  38}
  39static void disable_sys_timer0()
  40{
  41}
  42
  43static 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
  50static 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
  56static void sys_timer0_stop(void)
  57{
  58        disable_sys_timer();
  59}
  60
  61int __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}
  74