131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
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/* arch/arm/plat-samsung/include/plat/dma.h
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*
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* Copyright (C) 2003-2006 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* Samsung S3C DMA support
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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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#ifndef __PLAT_DMA_H
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#define __PLAT_DMA_H
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#include <linux/dma-mapping.h>
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enum s3c2410_dma_buffresult {
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S3C2410_RES_OK,
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S3C2410_RES_ERR,
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S3C2410_RES_ABORT
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};
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/* enum s3c2410_chan_op
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*
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* operation codes passed to the DMA code by the user, and also used
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* to inform the current channel owner of any changes to the system state
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*/
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enum s3c2410_chan_op {
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S3C2410_DMAOP_START,
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S3C2410_DMAOP_STOP,
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S3C2410_DMAOP_PAUSE,
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S3C2410_DMAOP_RESUME,
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S3C2410_DMAOP_FLUSH,
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S3C2410_DMAOP_TIMEOUT, /* internal signal to handler */
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S3C2410_DMAOP_STARTED, /* indicate channel started */
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};
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struct s3c2410_dma_client {
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char *name;
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};
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struct s3c2410_dma_chan;
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enum dma_ch;
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/* s3c2410_dma_cbfn_t
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*
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* buffer callback routine type
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*/
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typedef void (*s3c2410_dma_cbfn_t)(struct s3c2410_dma_chan *,
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void *buf, int size,
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enum s3c2410_dma_buffresult result);
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typedef int (*s3c2410_dma_opfn_t)(struct s3c2410_dma_chan *,
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enum s3c2410_chan_op );
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/* s3c2410_dma_request
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*
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* request a dma channel exclusivley
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*/
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extern int s3c2410_dma_request(enum dma_ch channel,
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struct s3c2410_dma_client *, void *dev);
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/* s3c2410_dma_ctrl
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*
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* change the state of the dma channel
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*/
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extern int s3c2410_dma_ctrl(enum dma_ch channel, enum s3c2410_chan_op op);
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/* s3c2410_dma_setflags
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*
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* set the channel's flags to a given state
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*/
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extern int s3c2410_dma_setflags(enum dma_ch channel,
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unsigned int flags);
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/* s3c2410_dma_free
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*
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* free the dma channel (will also abort any outstanding operations)
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*/
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extern int s3c2410_dma_free(enum dma_ch channel, struct s3c2410_dma_client *);
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/* s3c2410_dma_enqueue
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*
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* place the given buffer onto the queue of operations for the channel.
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* The buffer must be allocated from dma coherent memory, or the Dcache/WB
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* drained before the buffer is given to the DMA system.
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*/
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extern int s3c2410_dma_enqueue(enum dma_ch channel, void *id,
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dma_addr_t data, int size);
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/* s3c2410_dma_config
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*
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* configure the dma channel
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*/
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extern int s3c2410_dma_config(enum dma_ch channel, int xferunit);
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/* s3c2410_dma_devconfig
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*
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* configure the device we're talking to
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*/
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extern int s3c2410_dma_devconfig(enum dma_ch channel,
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enum dma_data_direction source, unsigned long devaddr);
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/* s3c2410_dma_getposition
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*
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* get the position that the dma transfer is currently at
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*/
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extern int s3c2410_dma_getposition(enum dma_ch channel,
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dma_addr_t *src, dma_addr_t *dest);
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extern int s3c2410_dma_set_opfn(enum dma_ch, s3c2410_dma_opfn_t rtn);
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extern int s3c2410_dma_set_buffdone_fn(enum dma_ch, s3c2410_dma_cbfn_t rtn);
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#include <plat/dma-ops.h>
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#endif
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