45 lines
No EOL
1.8 KiB
C
45 lines
No EOL
1.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2011 by Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __KERNEL_IMX233__
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#define __KERNEL_IMX233__
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#include "kernel.h"
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/* The i.MX233 uses in several places virtual channels to multiplex the work.
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* To arbiter the use of the different channels, we use a simple channel arbiter
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* based on a semaphore to count the number of channels in use, and a bitmask
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* protected by a mutex */
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struct channel_arbiter_t
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{
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struct semaphore sema;
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struct mutex mutex;
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unsigned free_bm;
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int count;
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};
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void arbiter_init(struct channel_arbiter_t *a, unsigned count);
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// doesn't check in use !
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void arbiter_reserve(struct channel_arbiter_t *a, unsigned channel);
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/* return channel on success and OBJ_WAIT_TIMEOUT on failure */
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int arbiter_acquire(struct channel_arbiter_t *a, int timeout);
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void arbiter_release(struct channel_arbiter_t *a, int channel);
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#endif /* __KERNEL_IMX233__ */ |