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/*
**********************************************************************
* timer.c
* Copyright (C) 1999, 2000 Creative Labs, inc.
*
**********************************************************************
*
* 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, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
* USA.
*
**********************************************************************
*/
/* 3/6/2000 Improved support for different timer delays Rui Sousa */
/* 4/3/2000 Implemented timer list using list.h Rui Sousa */
#include "hwaccess.h"
#include "8010.h"
#include "irqmgr.h"
#include "timer.h"
/* Try to schedule only once per fragment */
void emu10k1_timer_irqhandler(struct emu10k1_card *card)
{
struct emu_timer *t;
struct list_head *entry;
spin_lock(&card->timer_lock);
list_for_each(entry, &card->timers) {
t = list_entry(entry, struct emu_timer, list);
if (t->state & TIMER_STATE_ACTIVE) {
t->count++;
if (t->count == t->count_max) {
t->count = 0;
tasklet_hi_schedule(&t->tasklet);
}
}
}
spin_unlock(&card->timer_lock);
return;
}
void emu10k1_timer_install(struct emu10k1_card *card, struct emu_timer *timer, u32 delay)
{
struct emu_timer *t;
struct list_head *entry;
unsigned long flags;
if (delay < 5)
delay = 5;
timer->delay = delay;
timer->state = TIMER_STATE_INSTALLED;
spin_lock_irqsave(&card->timer_lock, flags);
timer->count_max = timer->delay / (card->timer_delay < 1024 ? card->timer_delay : 1024);
timer->count = timer->count_max - 1;
list_add(&timer->list, &card->timers);
if (card->timer_delay > delay) {
if (card->timer_delay == TIMER_STOPPED)
emu10k1_irq_enable(card, INTE_INTERVALTIMERENB);
card->timer_delay = delay;
delay = (delay < 1024 ? delay : 1024);
emu10k1_writefn0(card, TIMER_RATE, delay);
list_for_each(entry, &card->timers) {
t = list_entry(entry, struct emu_timer, list);
t->count_max = t->delay / delay;
/* don't want to think much, just force scheduling
on the next interrupt */
t->count = t->count_max - 1;
}
DPD(2, "timer rate --> %u\n", delay);
}
spin_unlock_irqrestore(&card->timer_lock, flags);
return;
}
void emu10k1_timer_uninstall(struct emu10k1_card *card, struct emu_timer *timer)
{
struct emu_timer *t;
struct list_head *entry;
u32 delay = TIMER_STOPPED;
unsigned long flags;
if (timer->state == TIMER_STATE_UNINSTALLED)
return;
spin_lock_irqsave(&card->timer_lock, flags);
list_del(&timer->list);
list_for_each(entry, &card->timers) {
t = list_entry(entry, struct emu_timer, list);
if (t->delay < delay)
delay = t->delay;
}
if (card->timer_delay != delay) {
card->timer_delay = delay;
if (delay == TIMER_STOPPED)
emu10k1_irq_disable(card, INTE_INTERVALTIMERENB);
else {
delay = (delay < 1024 ? delay : 1024);
emu10k1_writefn0(card, TIMER_RATE, delay);
list_for_each(entry, &card->timers) {
t = list_entry(entry, struct emu_timer, list);
t->count_max = t->delay / delay;
t->count = t->count_max - 1;
}
}
DPD(2, "timer rate --> %u\n", delay);
}
spin_unlock_irqrestore(&card->timer_lock, flags);
timer->state = TIMER_STATE_UNINSTALLED;
return;
}
void emu10k1_timer_enable(struct emu10k1_card *card, struct emu_timer *timer)
{
unsigned long flags;
spin_lock_irqsave(&card->timer_lock, flags);
timer->state |= TIMER_STATE_ACTIVE;
spin_unlock_irqrestore(&card->timer_lock, flags);
return;
}
void emu10k1_timer_disable(struct emu10k1_card *card, struct emu_timer *timer)
{
unsigned long flags;
spin_lock_irqsave(&card->timer_lock, flags);
timer->state &= ~TIMER_STATE_ACTIVE;
spin_unlock_irqrestore(&card->timer_lock, flags);
return;
}
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