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/* linux/arch/arm/plat-s3c/dma.c
*
* Copyright (c) 2003-2009 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C DMA core
*
* 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.
*/
struct s3c2410_dma_buf;
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <mach/dma.h>
#include <mach/irqs.h>
/* dma channel state information */
struct s3c2410_dma_chan s3c2410_chans[S3C_DMA_CHANNELS];
struct s3c2410_dma_chan *s3c_dma_chan_map[DMACH_MAX];
/* s3c_dma_lookup_channel
*
* change the dma channel number given into a real dma channel id
*/
struct s3c2410_dma_chan *s3c_dma_lookup_channel(unsigned int channel)
{
if (channel & DMACH_LOW_LEVEL)
return &s3c2410_chans[channel & ~DMACH_LOW_LEVEL];
else
return s3c_dma_chan_map[channel];
}
/* do we need to protect the settings of the fields from
* irq?
*/
int s3c2410_dma_set_opfn(unsigned int channel, s3c2410_dma_opfn_t rtn)
{
struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
if (chan == NULL)
return -EINVAL;
pr_debug("%s: chan=%p, op rtn=%p\n", __func__, chan, rtn);
chan->op_fn = rtn;
return 0;
}
EXPORT_SYMBOL(s3c2410_dma_set_opfn);
int s3c2410_dma_set_buffdone_fn(unsigned int channel, s3c2410_dma_cbfn_t rtn)
{
struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
if (chan == NULL)
return -EINVAL;
pr_debug("%s: chan=%p, callback rtn=%p\n", __func__, chan, rtn);
chan->callback_fn = rtn;
return 0;
}
EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn);
int s3c2410_dma_setflags(unsigned int channel, unsigned int flags)
{
struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
if (chan == NULL)
return -EINVAL;
chan->flags = flags;
return 0;
}
EXPORT_SYMBOL(s3c2410_dma_setflags);
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