1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * arch/arm/include/asm/mach/dma.h 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 1998-2000 Russell King 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * This header file describes the interface between the generic DMA handler 8*4882a593Smuzhiyun * (dma.c) and the architecture-specific DMA backends (dma-*.c) 9*4882a593Smuzhiyun */ 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun struct dma_struct; 12*4882a593Smuzhiyun typedef struct dma_struct dma_t; 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun struct dma_ops { 15*4882a593Smuzhiyun int (*request)(unsigned int, dma_t *); /* optional */ 16*4882a593Smuzhiyun void (*free)(unsigned int, dma_t *); /* optional */ 17*4882a593Smuzhiyun void (*enable)(unsigned int, dma_t *); /* mandatory */ 18*4882a593Smuzhiyun void (*disable)(unsigned int, dma_t *); /* mandatory */ 19*4882a593Smuzhiyun int (*residue)(unsigned int, dma_t *); /* optional */ 20*4882a593Smuzhiyun int (*setspeed)(unsigned int, dma_t *, int); /* optional */ 21*4882a593Smuzhiyun const char *type; 22*4882a593Smuzhiyun }; 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun struct dma_struct { 25*4882a593Smuzhiyun void *addr; /* single DMA address */ 26*4882a593Smuzhiyun unsigned long count; /* single DMA size */ 27*4882a593Smuzhiyun struct scatterlist buf; /* single DMA */ 28*4882a593Smuzhiyun int sgcount; /* number of DMA SG */ 29*4882a593Smuzhiyun struct scatterlist *sg; /* DMA Scatter-Gather List */ 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun unsigned int active:1; /* Transfer active */ 32*4882a593Smuzhiyun unsigned int invalid:1; /* Address/Count changed */ 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun unsigned int dma_mode; /* DMA mode */ 35*4882a593Smuzhiyun int speed; /* DMA speed */ 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun unsigned int lock; /* Device is allocated */ 38*4882a593Smuzhiyun const char *device_id; /* Device name */ 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun const struct dma_ops *d_ops; 41*4882a593Smuzhiyun }; 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun /* 44*4882a593Smuzhiyun * isa_dma_add - add an ISA-style DMA channel 45*4882a593Smuzhiyun */ 46*4882a593Smuzhiyun extern int isa_dma_add(unsigned int, dma_t *dma); 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun /* 49*4882a593Smuzhiyun * Add the ISA DMA controller. Always takes channels 0-7. 50*4882a593Smuzhiyun */ 51*4882a593Smuzhiyun extern void isa_init_dma(void); 52