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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2021 Aidan MacDonald
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef __DMA_X1000_H__
#define __DMA_X1000_H__
#include "x1000/dma.h"
#include "x1000/dma_chn.h"
#include <stdint.h>
/* Events passed to DMA callbacks */
#define DMA_EVENT_NONE 0 /* Not used by DMA code but can be used as
* a sentinel value to indicate "no event" */
#define DMA_EVENT_INTERRUPT 1 /* Interrupt on a non-final descriptor */
#define DMA_EVENT_COMPLETE 2 /* Completed the final descriptor */
#define DMA_EVENT_ERROR 3 /* Some kind of error occurred */
/* All DMA channels which use interrupts must be statically defined here.
* The channel numbering should be contiguous, and lower channel numbers
* will have lower interrupt latency because they're serviced first.
*
* Channels >= DMA_NUM_USED_CHANNELS will NOT have interrupts serviced!
* Due to the possibility of address error interrupts that can occur even
* if no interrupts are requested on the channel, the unallocated channels
* cannot be used safely.
*/
#define DMA_CHANNEL_AUDIO 0
#define DMA_CHANNEL_RECORD 1
#define DMA_CHANNEL_FBCOPY 2
#define DMA_NUM_USED_CHANNELS 3
struct dma_desc {
uint32_t cm; /* meaning and layout same as DMA_CHN_CM */
uint32_t sa; /* source address */
uint32_t ta; /* target address */
uint32_t tc; /* low 24 bits: transfer count
* upper 8 bits: offset to next descriptor
*/
uint32_t sd; /* same as DMA_CHN_SD */
uint32_t rt; /* request type, same as DMA_CHN_RT */
uint32_t pad0;
uint32_t pad1;
} __attribute__((aligned(32)));
typedef struct dma_desc dma_desc;
typedef void(*dma_cb_func)(int event);
extern void dma_init(void) INIT_ATTR;
extern void dma_set_callback(int chn, dma_cb_func cb);
#endif /* __DMA_X1000_H__ */
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