85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2011 by Amaury Pouly
|
|
*
|
|
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
#include "kernel.h"
|
|
#include "timrot-imx233.h"
|
|
#include "clkctrl-imx233.h"
|
|
#include "kernel-imx233.h"
|
|
|
|
static void tick_timer(void)
|
|
{
|
|
/* Run through the list of tick tasks */
|
|
call_tick_tasks();
|
|
}
|
|
|
|
void tick_start(unsigned int interval_in_ms)
|
|
{
|
|
/* use the 1-kHz XTAL clock source */
|
|
imx233_setup_timer(TICK_TIMER_NR, true, interval_in_ms,
|
|
BV_TIMROT_TIMCTRLn_SELECT__1KHZ_XTAL, BV_TIMROT_TIMCTRLn_PRESCALE__DIV_BY_1,
|
|
false, &tick_timer);
|
|
}
|
|
|
|
|
|
void arbiter_init(struct channel_arbiter_t *a, unsigned count)
|
|
{
|
|
mutex_init(&a->mutex);
|
|
semaphore_init(&a->sema, count, count);
|
|
a->free_bm = (1 << count) - 1;
|
|
a->count = count;
|
|
}
|
|
|
|
// doesn't check in use !
|
|
void arbiter_reserve(struct channel_arbiter_t *a, unsigned channel)
|
|
{
|
|
// assume semaphore has a free slot immediately
|
|
if(semaphore_wait(&a->sema, TIMEOUT_NOBLOCK) != OBJ_WAIT_SUCCEEDED)
|
|
panicf("arbiter_reserve failed on semaphore_wait !");
|
|
mutex_lock(&a->mutex);
|
|
a->free_bm &= ~(1 << channel);
|
|
mutex_unlock(&a->mutex);
|
|
}
|
|
|
|
int arbiter_acquire(struct channel_arbiter_t *a, int timeout)
|
|
{
|
|
int w = semaphore_wait(&a->sema, timeout);
|
|
if(w == OBJ_WAIT_TIMEDOUT)
|
|
return w;
|
|
mutex_lock(&a->mutex);
|
|
int chan = find_first_set_bit(a->free_bm);
|
|
if(chan >= a->count)
|
|
panicf("arbiter_acquire cannot find a free channel !");
|
|
a->free_bm &= ~(1 << chan);
|
|
mutex_unlock(&a->mutex);
|
|
return chan;
|
|
}
|
|
|
|
bool arbiter_acquired(struct channel_arbiter_t *a, int channel)
|
|
{
|
|
return !(a->free_bm & (1 << channel));
|
|
}
|
|
|
|
void arbiter_release(struct channel_arbiter_t *a, int channel)
|
|
{
|
|
mutex_lock(&a->mutex);
|
|
a->free_bm |= 1 << channel;
|
|
mutex_unlock(&a->mutex);
|
|
semaphore_release(&a->sema);
|
|
}
|