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Diffstat (limited to 'arch/arm/include/asm/mach/dma.h')
-rw-r--r-- | arch/arm/include/asm/mach/dma.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/arm/include/asm/mach/dma.h b/arch/arm/include/asm/mach/dma.h new file mode 100644 index 000000000..1506422af --- /dev/null +++ b/arch/arm/include/asm/mach/dma.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * arch/arm/include/asm/mach/dma.h + * + * Copyright (C) 1998-2000 Russell King + * + * This header file describes the interface between the generic DMA handler + * (dma.c) and the architecture-specific DMA backends (dma-*.c) + */ + +struct dma_struct; +typedef struct dma_struct dma_t; + +struct dma_ops { + int (*request)(unsigned int, dma_t *); /* optional */ + void (*free)(unsigned int, dma_t *); /* optional */ + void (*enable)(unsigned int, dma_t *); /* mandatory */ + void (*disable)(unsigned int, dma_t *); /* mandatory */ + int (*residue)(unsigned int, dma_t *); /* optional */ + int (*setspeed)(unsigned int, dma_t *, int); /* optional */ + const char *type; +}; + +struct dma_struct { + void *addr; /* single DMA address */ + unsigned long count; /* single DMA size */ + struct scatterlist buf; /* single DMA */ + int sgcount; /* number of DMA SG */ + struct scatterlist *sg; /* DMA Scatter-Gather List */ + + unsigned int active:1; /* Transfer active */ + unsigned int invalid:1; /* Address/Count changed */ + + unsigned int dma_mode; /* DMA mode */ + int speed; /* DMA speed */ + + unsigned int lock; /* Device is allocated */ + const char *device_id; /* Device name */ + + const struct dma_ops *d_ops; +}; + +/* + * isa_dma_add - add an ISA-style DMA channel + */ +extern int isa_dma_add(unsigned int, dma_t *dma); + +/* + * Add the ISA DMA controller. Always takes channels 0-7. + */ +extern void isa_init_dma(void); |