87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
|
/* linux/arch/arm/plat-s3c/dma.c
|
||
|
|
*
|
||
|
|
* Copyright (c) 2003-2005,2006,2009 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>
|
||
|
|
|
||
|
|
#include <plat/dma-plat.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);
|