| /* |
| * arch/arm/include/asm/mach/dma.h |
| * |
| * Copyright (C) 1998-2000 Russell King |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * 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)(dmach_t, dma_t *); /* optional */ |
| void (*free)(dmach_t, dma_t *); /* optional */ |
| void (*enable)(dmach_t, dma_t *); /* mandatory */ |
| void (*disable)(dmach_t, dma_t *); /* mandatory */ |
| int (*residue)(dmach_t, dma_t *); /* optional */ |
| int (*setspeed)(dmach_t, dma_t *, int); /* optional */ |
| 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 */ |
| |
| dmamode_t dma_mode; /* DMA mode */ |
| int speed; /* DMA speed */ |
| |
| unsigned int lock; /* Device is allocated */ |
| const char *device_id; /* Device name */ |
| |
| unsigned int dma_base; /* Controller base address */ |
| int dma_irq; /* Controller IRQ */ |
| struct scatterlist cur_sg; /* Current controller buffer */ |
| unsigned int state; |
| |
| struct dma_ops *d_ops; |
| }; |
| |
| /* Prototype: void arch_dma_init(dma) |
| * Purpose : Initialise architecture specific DMA |
| * Params : dma - pointer to array of DMA structures |
| */ |
| extern void arch_dma_init(dma_t *dma); |
| |
| extern void isa_init_dma(dma_t *dma); |