linux/arch/mn10300/kernel/profile.c
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   1/* MN10300 Profiling setup
   2 *
   3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public Licence
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the Licence, or (at your option) any later version.
  10 */
  11
  12/*
  13 * initialise the profiling if enabled
  14 * - using with gdbstub will give anomalous results
  15 * - can't be used with gdbstub if running at IRQ priority 0
  16 */
  17static __init int profile_init(void)
  18{
  19        u16 tmp;
  20
  21        if (!prof_buffer)
  22                return 0;
  23
  24        /* use timer 11 to drive the profiling interrupts */
  25        set_intr_stub(EXCEP_IRQ_LEVEL0, profile_handler);
  26
  27        /* set IRQ priority at which to run */
  28        set_intr_level(TM11IRQ, GxICR_LEVEL_0);
  29
  30        /* set up timer 11
  31         * - source: (IOCLK 33MHz)*2 = 66MHz
  32         * - frequency: (33330000*2) / 8 / 20625 = 202Hz
  33         */
  34        TM11BR = 20625 - 1;
  35        TM11MD = TM8MD_SRC_IOCLK_8;
  36        TM11MD |= TM8MD_INIT_COUNTER;
  37        TM11MD &= ~TM8MD_INIT_COUNTER;
  38        TM11MD |= TM8MD_COUNT_ENABLE;
  39
  40        TM11ICR |= GxICR_ENABLE;
  41        tmp = TM11ICR;
  42
  43        printk(KERN_INFO "Profiling initiated on timer 11, priority 0, %uHz\n",
  44               mn10300_ioclk / 8 / (TM11BR + 1));
  45        printk(KERN_INFO "Profile histogram stored %p-%p\n",
  46               prof_buffer, (u8 *)(prof_buffer + prof_len) - 1);
  47
  48        return 0;
  49}
  50
  51__initcall(profile_init);
  52