raspberrypi-dma.h

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/* SPDX-License-Identifier: BSD-2-Clause */
 
/*
 * Copyright (C) 2025 Shaunak Datar
 *
 * 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.
 *
 * 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 OWNER OR CONTRIBUTORS 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.
 */
#ifndef LIBBSP_AARCH64_RASPBERRYPI_DMA_H
#define LIBBSP_AARCH64_RASPBERRYPI_DMA_H
 
#include <bsp/raspberrypi.h>
#include <bsp/rpi-gpio.h>
#include <bsp/utility.h>
#include <rtems/malloc.h>
#include <rtems/rtems/cache.h>
#include <rtems/score/basedefs.h>
#include <rtems/score/cpu.h>
#include <stdlib.h>
#include <string.h>
 
#ifdef __cplusplus
extern "C" {
#endif
typedef enum {
  DMA_CHANNEL_0,
  DMA_CHANNEL_1,
  DMA_CHANNEL_2,
  DMA_CHANNEL_3,
  DMA_CHANNEL_4,
  DMA_CHANNEL_5,
  DMA_CHANNEL_6,
  DMA_LITE_CHANNEL_7,
  DMA_LITE_CHANNEL_8,
  DMA_LITE_CHANNEL_9,
  DMA_LITE_CHANNEL_10,
  DMA4_CHANNEL_11,
  DMA4_CHANNEL_12,
  DMA4_CHANNEL_13,
  DMA4_CHANNEL_14,
} rpi_dma_channel;
rtems_status_code rpi_dma_start_transfer( rpi_dma_channel channel );
 
rtems_status_code rpi_dma_wait( rpi_dma_channel channel );
 
rtems_status_code rpi_dma_mem_to_mem_init(
  rpi_dma_channel channel,
  void           *source_address,
  void           *destination_address,
  uint32_t        transfer_length
);
 
#ifdef __cplusplus
}
#endif
 
#endif /* LIBBSP_AARCH64_RASPBERRYPI_DMA_H */