70 lines
2.6 KiB
C
70 lines
2.6 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) 2021 Aidan MacDonald
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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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#ifndef __DMA_X1000_H__
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#define __DMA_X1000_H__
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#include "x1000/dma.h"
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#include "x1000/dma_chn.h"
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#include <stdint.h>
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/* Events passed to DMA callbacks */
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#define DMA_EVENT_NONE 0 /* Not used by DMA code but can be used as
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* a sentinel value to indicate "no event" */
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#define DMA_EVENT_INTERRUPT 1 /* Interrupt on a non-final descriptor */
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#define DMA_EVENT_COMPLETE 2 /* Completed the final descriptor */
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#define DMA_EVENT_ERROR 3 /* Some kind of error occurred */
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/* All DMA channels which use interrupts must be statically defined here.
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* The channel numbering should be contiguous, and lower channel numbers
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* will have lower interrupt latency because they're serviced first.
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*
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* Channels >= DMA_NUM_USED_CHANNELS will NOT have interrupts serviced!
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* Due to the possibility of address error interrupts that can occur even
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* if no interrupts are requested on the channel, the unallocated channels
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* cannot be used safely.
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*/
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#define DMA_CHANNEL_AUDIO 0
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#define DMA_CHANNEL_FBCOPY 1
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#define DMA_NUM_USED_CHANNELS 2
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struct dma_desc {
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uint32_t cm; /* meaning and layout same as DMA_CHN_CM */
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uint32_t sa; /* source address */
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uint32_t ta; /* target address */
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uint32_t tc; /* low 24 bits: transfer count
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* upper 8 bits: offset to next descriptor
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*/
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uint32_t sd; /* same as DMA_CHN_SD */
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uint32_t rt; /* request type, same as DMA_CHN_RT */
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uint32_t pad0;
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uint32_t pad1;
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} __attribute__((aligned(32)));
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typedef struct dma_desc dma_desc;
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typedef void(*dma_cb_func)(int event);
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extern void dma_init(void);
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extern void dma_set_callback(int chn, dma_cb_func cb);
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#endif /* __DMA_X1000_H__ */
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