firmware/target/arm/imx233/kernel-imx233.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2011 by Amaury Pouly
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #ifndef __KERNEL_IMX233__
  22 #define __KERNEL_IMX233__
  23
  24 #include "kernel.h"
  25
  26 #ifdef SANSA_FUZEPLUS
  27 #define TICK_TIMER_NR   0
  28 #elif defined(CREATIVE_ZENXFI2)
  29 #define TICK_TIMER_NR   0
  30 #elif defined(CREATIVE_ZENXFI3)
  31 #define TICK_TIMER_NR   0
  32 #else
  33 #error Select tick timer !
  34 #endif
  35
  36 /* The i.MX233 uses in several places virtual channels to multiplex the work.
  37  * To arbiter the use of the different channels, we use a simple channel arbiter
  38  * based on a semaphore to count the number of channels in use, and a bitmask
  39  * protected by a mutex */
  40 struct channel_arbiter_t
  41 {
  42     struct semaphore sema;
  43     struct mutex mutex;
  44     unsigned free_bm;
  45     int count;
  46 };
  47
  48 void arbiter_init(struct channel_arbiter_t *a, unsigned count);
  49 // doesn't check in use !
  50 void arbiter_reserve(struct channel_arbiter_t *a, unsigned channel);
  51 /* return channel on success and OBJ_WAIT_TIMEOUT on failure */
  52 int arbiter_acquire(struct channel_arbiter_t *a, int timeout);
  53 void arbiter_release(struct channel_arbiter_t *a, int channel);
  54 bool arbiter_acquired(struct channel_arbiter_t *a, int channel);
  55
  56 #endif /* __KERNEL_IMX233__ */