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/*
* Example events provider
*
* Copyright (C) ARM Limited 2010-2011. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Similar entires must be present in events.xml file:
*
* <counter_set name="mmaped_cntX">
* <counter name="mmaped_cnt0"/>
* <counter name="mmaped_cnt1"/>
* </counter_set>
* <category name="mmaped" counter_set="mmaped_cntX" per_cpu="no">
* <event event="0x0" title="Simulated" name="Sine" description="Sort-of-sine"/>
* <event event="0x1" title="Simulated" name="Triangle" description="Triangular wave"/>
* <event event="0x2" title="Simulated" name="PWM" description="PWM Signal"/>
* </category>
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ratelimit.h>
#include "gator.h"
#define MMAPED_COUNTERS_NUM 3
static struct {
unsigned long enabled;
unsigned long event;
unsigned long key;
} mmaped_counters[MMAPED_COUNTERS_NUM];
static int mmaped_buffer[MMAPED_COUNTERS_NUM * 2];
#ifdef TODO
static void __iomem *mmaped_base;
#endif
/* Adds mmaped_cntX directories and enabled, event, and key files to /dev/gator/events */
static int gator_events_mmaped_create_files(struct super_block *sb,
struct dentry *root)
{
int i;
for (i = 0; i < MMAPED_COUNTERS_NUM; i++) {
char buf[16];
struct dentry *dir;
snprintf(buf, sizeof(buf), "mmaped_cnt%d", i);
dir = gatorfs_mkdir(sb, root, buf);
if (WARN_ON(!dir))
return -1;
gatorfs_create_ulong(sb, dir, "enabled",
&mmaped_counters[i].enabled);
gatorfs_create_ulong(sb, dir, "event",
&mmaped_counters[i].event);
gatorfs_create_ro_ulong(sb, dir, "key",
&mmaped_counters[i].key);
}
return 0;
}
static int gator_events_mmaped_start(void)
{
#ifdef TODO
for (i = 0; i < MMAPED_COUNTERS_NUM; i++)
writel(mmaped_counters[i].event,
mmaped_base + COUNTERS_CONFIG_OFFSET[i]);
writel(ENABLED, COUNTERS_CONTROL_OFFSET);
#endif
return 0;
}
static void gator_events_mmaped_stop(void)
{
#ifdef TODO
writel(DISABLED, COUNTERS_CONTROL_OFFSET);
#endif
}
#ifndef TODO
/* This function "simulates" counters, generating values of fancy
* functions like sine or triangle... */
static int mmaped_simulate(int counter)
{
int result = 0;
switch (counter) {
case 0: /* sort-of-sine */
{
static int t;
int x;
if (t % 1024 < 512)
x = 512 - (t % 512);
else
x = t % 512;
result = 32 * x / 512;
result = result * result;
if (t < 1024)
result = 1922 - result;
t = (t + 1) % 2048;
}
break;
case 1: /* triangle */
{
static int v, d = 1;
v += d;
if (v % 2000 == 0)
d = -d;
result = v;
}
break;
case 2: /* PWM signal */
{
static int t, dc;
t = (t + 1) % 2000;
if (t % 100)
dc = (dc + 200) % 2000;
result = t < dc ? 0 : 2000;
}
break;
}
return result;
}
#endif
static int gator_events_mmaped_read(int **buffer)
{
int i;
int len = 0;
/* System wide counters - read from one core only */
if (smp_processor_id())
return 0;
for (i = 0; i < MMAPED_COUNTERS_NUM; i++) {
if (mmaped_counters[i].enabled) {
mmaped_buffer[len++] = mmaped_counters[i].key;
#ifdef TODO
mmaped_buffer[len++] = readl(mmaped_base +
COUNTERS_VALUE_OFFSET[i]);
#else
mmaped_buffer[len++] = mmaped_simulate(
mmaped_counters[i].event);
#endif
}
}
if (buffer)
*buffer = mmaped_buffer;
return len;
}
static struct gator_interface gator_events_mmaped_interface = {
.create_files = gator_events_mmaped_create_files,
.start = gator_events_mmaped_start,
.stop = gator_events_mmaped_stop,
.read = gator_events_mmaped_read,
};
/* Must not be static! */
int __init gator_events_mmaped_init(void)
{
int i;
#ifdef TODO
mmaped_base = ioremap(COUNTERS_PHYS_ADDR, SZ_4K);
if (!mmaped_base)
return -ENOMEM;
#endif
for (i = 0; i < MMAPED_COUNTERS_NUM; i++) {
mmaped_counters[i].enabled = 0;
mmaped_counters[i].key = gator_events_get_key();
}
return gator_events_install(&gator_events_mmaped_interface);
}
gator_events_init(gator_events_mmaped_init);
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