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