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dma.c
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dma.c
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/*
* dma.c
*
* Copyright (c) 2014 Jeremy Garff <jer @ jers.net>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
* 3. Neither the name of the owner nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "dma.h"
// DMA address mapping by DMA number index
static const uint32_t dma_offset[] =
{
DMA0_OFFSET,
DMA1_OFFSET,
DMA2_OFFSET,
DMA3_OFFSET,
DMA4_OFFSET,
DMA5_OFFSET,
DMA6_OFFSET,
DMA7_OFFSET,
DMA8_OFFSET,
DMA9_OFFSET,
DMA10_OFFSET,
DMA11_OFFSET,
DMA12_OFFSET,
DMA13_OFFSET,
DMA14_OFFSET,
DMA15_OFFSET,
};
uint32_t dmanum_to_offset(int dmanum)
{
int array_size = sizeof(dma_offset) / sizeof(dma_offset[0]);
if (dmanum >= array_size)
{
return 0;
}
return dma_offset[dmanum];
}