79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
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/***************************************************************************
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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 Tomasz Moń
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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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#include "config.h"
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#include "kernel.h"
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#include "thread.h"
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#include "system.h"
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#include "dma-target.h"
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#include "dm320.h"
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#include <stdbool.h>
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void dma_init(void)
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{
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/* TODO */
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}
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/*
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Requests channel for peripheral.
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Returns channel assigned for caller which must be released after
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transfer complete using dma_release_channel().
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*/
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int dma_request_channel(int peripheral, int mode)
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{
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/* TODO: proper checking if channel is already taken
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currently only SDMMC and DSP uses DMA on this target */
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int channel = -1;
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if (peripheral == DMA_PERIPHERAL_MMCSD)
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{
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/* Set first DMA channel */
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IO_SDRAM_SDDMASEL = (IO_SDRAM_SDDMASEL & 0xFFE0) | peripheral |
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(mode << 3);
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channel = 1;
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}
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else if (peripheral == DMA_PERIPHERAL_DSP)
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{
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/* Set second DMA channel */
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IO_SDRAM_SDDMASEL = (IO_SDRAM_SDDMASEL & 0xFC1F) |
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(peripheral << 5) |
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(mode << 8);
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channel = 2;
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}
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else if (peripheral == DMA_PERIPHERAL_SIF)
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{
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IO_SDRAM_SDDMASEL = (IO_SDRAM_SDDMASEL & 0x83FF) |
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(peripheral << 10) |
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(mode << 13);
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channel = 3;
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}
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return channel;
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}
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void dma_release_channel(int channel)
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{
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(void)channel;
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/* TODO */
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}
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