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/*
* 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 <asm/ptrace.h>
#include <asm/system.h>
#include <asm/blackfin.h>
#include <asm/irq.h>
#include <asm/io.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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