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51 lines
1.4 KiB
51 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* arch/arm/include/asm/mach/dma.h |
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* |
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* Copyright (C) 1998-2000 Russell King |
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* |
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* This header file describes the interface between the generic DMA handler |
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* (dma.c) and the architecture-specific DMA backends (dma-*.c) |
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*/ |
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struct dma_struct; |
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typedef struct dma_struct dma_t; |
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struct dma_ops { |
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int (*request)(unsigned int, dma_t *); /* optional */ |
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void (*free)(unsigned int, dma_t *); /* optional */ |
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void (*enable)(unsigned int, dma_t *); /* mandatory */ |
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void (*disable)(unsigned int, dma_t *); /* mandatory */ |
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int (*residue)(unsigned int, dma_t *); /* optional */ |
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int (*setspeed)(unsigned int, dma_t *, int); /* optional */ |
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const char *type; |
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}; |
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struct dma_struct { |
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void *addr; /* single DMA address */ |
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unsigned long count; /* single DMA size */ |
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struct scatterlist buf; /* single DMA */ |
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int sgcount; /* number of DMA SG */ |
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struct scatterlist *sg; /* DMA Scatter-Gather List */ |
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unsigned int active:1; /* Transfer active */ |
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unsigned int invalid:1; /* Address/Count changed */ |
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unsigned int dma_mode; /* DMA mode */ |
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int speed; /* DMA speed */ |
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unsigned int lock; /* Device is allocated */ |
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const char *device_id; /* Device name */ |
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const struct dma_ops *d_ops; |
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}; |
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/* |
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* isa_dma_add - add an ISA-style DMA channel |
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*/ |
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extern int isa_dma_add(unsigned int, dma_t *dma); |
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/* |
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* Add the ISA DMA controller. Always takes channels 0-7. |
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*/ |
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extern void isa_init_dma(void);
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