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author | Ben Dooks <ben-linux@fluff.org> | 2010-01-29 09:02:15 +0000 |
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committer | Ben Dooks <ben-linux@fluff.org> | 2010-02-23 00:03:43 +0000 |
commit | 2c420fe22f3d526691773288807d010068ce3033 (patch) | |
tree | 8e2605d8ec4cc6f076d7a04f2aa9e3e2727d976d /arch/arm/plat-samsung/dma.c | |
parent | 806c17b5497f62faa65a1fdd235b7fa2df17d704 (diff) | |
download | op-kernel-dev-2c420fe22f3d526691773288807d010068ce3033.zip op-kernel-dev-2c420fe22f3d526691773288807d010068ce3033.tar.gz |
ARM: SAMSUNG: Move DMA support to plat-samsung
Move the core of the DMA support to plat-samsung for everyone to use.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/plat-samsung/dma.c')
-rw-r--r-- | arch/arm/plat-samsung/dma.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/dma.c b/arch/arm/plat-samsung/dma.c new file mode 100644 index 0000000..606db1a --- /dev/null +++ b/arch/arm/plat-samsung/dma.c @@ -0,0 +1,84 @@ +/* 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); |