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2f757f2ab7
Rather than having the central DMA multiplexer call the architecture specific DMA initialization function, have each architecture DMA initialization function use core_initcall(), and register each DMA channel separately with the multiplexer. This removes the array of dma structures in the central multiplexer, replacing it with an array of pointers instead; this is more flexible since it allows the drivers to wrap the DMA structure (eventually allowing us to transition non-ISA DMA drivers away.) Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/*
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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 program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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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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dmamode_t 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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unsigned int dma_base; /* Controller base address */
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int dma_irq; /* Controller IRQ */
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struct scatterlist cur_sg; /* Current controller buffer */
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unsigned int state;
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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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