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