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common.c

/*
 * File:         arch/blackfin/oprofile/common.c
 * Based on:     arch/alpha/oprofile/common.c
 * Author:       Anton Blanchard <anton@au.ibm.com>
 *
 * Created:
 * Description:
 *
 * Modified:
 *               Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/oprofile.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/ptrace.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <asm/system.h>
#include <asm/blackfin.h>

#include "op_blackfin.h"

#define BFIN_533_ID  0xE5040003
#define BFIN_537_ID  0xE5040002

static int pfmon_enabled;
static struct mutex pfmon_lock;

struct op_bfin533_model *model;

struct op_counter_config ctr[OP_MAX_COUNTER];

static int op_bfin_setup(void)
{
      int ret;

      /* Pre-compute the values to stuff in the hardware registers.  */
      spin_lock(&oprofilefs_lock);
      ret = model->reg_setup(ctr);
      spin_unlock(&oprofilefs_lock);

      return ret;
}

static void op_bfin_shutdown(void)
{
#if 0
      /* what is the difference between shutdown and stop? */
#endif
}

static int op_bfin_start(void)
{
      int ret = -EBUSY;

      printk(KERN_INFO "KSDBG:in %s\n", __FUNCTION__);
      mutex_lock(&pfmon_lock);
      if (!pfmon_enabled) {
            ret = model->start(ctr);
            pfmon_enabled = !ret;
      }
      mutex_unlock(&pfmon_lock);

      return ret;
}

static void op_bfin_stop(void)
{
      mutex_lock(&pfmon_lock);
      if (pfmon_enabled) {
            model->stop();
            pfmon_enabled = 0;
      }
      mutex_unlock(&pfmon_lock);
}

static int op_bfin_create_files(struct super_block *sb, struct dentry *root)
{
      int i;

      for (i = 0; i < model->num_counters; ++i) {
            struct dentry *dir;
            char buf[3];
            printk(KERN_INFO "Oprofile: creating files... \n");

            snprintf(buf, sizeof buf, "%d", i);
            dir = oprofilefs_mkdir(sb, root, buf);

            oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
            oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
            oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
            /*
             * We dont support per counter user/kernel selection, but
             * we leave the entries because userspace expects them
             */
            oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
            oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
            oprofilefs_create_ulong(sb, dir, "unit_mask",
                              &ctr[i].unit_mask);
      }

      return 0;
}
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
#ifdef CONFIG_HARDWARE_PM
      unsigned int dspid;

      mutex_init(&pfmon_lock);

      dspid = bfin_read_DSPID();

      printk(KERN_INFO "Oprofile got the cpu id is 0x%x. \n", dspid);

      switch (dspid) {
      case BFIN_533_ID:
            model = &op_model_bfin533;
            model->num_counters = 2;
            break;
      case BFIN_537_ID:
            model = &op_model_bfin533;
            model->num_counters = 2;
            break;
      default:
            return -ENODEV;
      }

      ops->cpu_type = model->name;
      ops->create_files = op_bfin_create_files;
      ops->setup = op_bfin_setup;
      ops->shutdown = op_bfin_shutdown;
      ops->start = op_bfin_start;
      ops->stop = op_bfin_stop;

      printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
             ops->cpu_type);

      return 0;
#else
      return -1;
#endif
}

void oprofile_arch_exit(void)
{
}

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