1 /* linux/arch/arm/plat-samsung/dma.c
3 * Copyright (c) 2003-2009 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 * http://armlinux.simtec.co.uk/
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 struct s3c2410_dma_buf
;
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/errno.h>
21 #include <mach/irqs.h>
23 /* dma channel state information */
24 struct s3c2410_dma_chan s3c2410_chans
[S3C_DMA_CHANNELS
];
25 struct s3c2410_dma_chan
*s3c_dma_chan_map
[DMACH_MAX
];
27 /* s3c_dma_lookup_channel
29 * change the dma channel number given into a real dma channel id
32 struct s3c2410_dma_chan
*s3c_dma_lookup_channel(unsigned int channel
)
34 if (channel
& DMACH_LOW_LEVEL
)
35 return &s3c2410_chans
[channel
& ~DMACH_LOW_LEVEL
];
37 return s3c_dma_chan_map
[channel
];
40 /* do we need to protect the settings of the fields from
44 int s3c2410_dma_set_opfn(unsigned int channel
, s3c2410_dma_opfn_t rtn
)
46 struct s3c2410_dma_chan
*chan
= s3c_dma_lookup_channel(channel
);
51 pr_debug("%s: chan=%p, op rtn=%p\n", __func__
, chan
, rtn
);
57 EXPORT_SYMBOL(s3c2410_dma_set_opfn
);
59 int s3c2410_dma_set_buffdone_fn(unsigned int channel
, s3c2410_dma_cbfn_t rtn
)
61 struct s3c2410_dma_chan
*chan
= s3c_dma_lookup_channel(channel
);
66 pr_debug("%s: chan=%p, callback rtn=%p\n", __func__
, chan
, rtn
);
68 chan
->callback_fn
= rtn
;
72 EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn
);
74 int s3c2410_dma_setflags(unsigned int channel
, unsigned int flags
)
76 struct s3c2410_dma_chan
*chan
= s3c_dma_lookup_channel(channel
);
84 EXPORT_SYMBOL(s3c2410_dma_setflags
);