| Ben Dooks | 97c1b14 | 2009-03-19 15:02:39 +0000 | [diff] [blame] | 1 | /* linux/arch/arm/plat-s3c/dma.c |
| 2 | * |
| 3 | * Copyright (c) 2003-2005,2006,2009 Simtec Electronics |
| 4 | * Ben Dooks <ben@simtec.co.uk> |
| 5 | * http://armlinux.simtec.co.uk/ |
| 6 | * |
| 7 | * S3C DMA core |
| 8 | * |
| 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. |
| 12 | */ |
| 13 | |
| 14 | struct s3c2410_dma_buf; |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/errno.h> |
| 19 | |
| 20 | #include <mach/dma.h> |
| 21 | #include <mach/irqs.h> |
| 22 | |
| 23 | #include <plat/dma-plat.h> |
| 24 | |
| 25 | /* dma channel state information */ |
| 26 | struct s3c2410_dma_chan s3c2410_chans[S3C_DMA_CHANNELS]; |
| 27 | struct s3c2410_dma_chan *s3c_dma_chan_map[DMACH_MAX]; |
| 28 | |
| 29 | /* s3c_dma_lookup_channel |
| 30 | * |
| 31 | * change the dma channel number given into a real dma channel id |
| 32 | */ |
| 33 | |
| 34 | struct s3c2410_dma_chan *s3c_dma_lookup_channel(unsigned int channel) |
| 35 | { |
| 36 | if (channel & DMACH_LOW_LEVEL) |
| 37 | return &s3c2410_chans[channel & ~DMACH_LOW_LEVEL]; |
| 38 | else |
| 39 | return s3c_dma_chan_map[channel]; |
| 40 | } |
| 41 | |
| 42 | /* do we need to protect the settings of the fields from |
| 43 | * irq? |
| 44 | */ |
| 45 | |
| 46 | int s3c2410_dma_set_opfn(unsigned int channel, s3c2410_dma_opfn_t rtn) |
| 47 | { |
| 48 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); |
| 49 | |
| 50 | if (chan == NULL) |
| 51 | return -EINVAL; |
| 52 | |
| 53 | pr_debug("%s: chan=%p, op rtn=%p\n", __func__, chan, rtn); |
| 54 | |
| 55 | chan->op_fn = rtn; |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | EXPORT_SYMBOL(s3c2410_dma_set_opfn); |
| 60 | |
| 61 | int s3c2410_dma_set_buffdone_fn(unsigned int channel, s3c2410_dma_cbfn_t rtn) |
| 62 | { |
| 63 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); |
| 64 | |
| 65 | if (chan == NULL) |
| 66 | return -EINVAL; |
| 67 | |
| 68 | pr_debug("%s: chan=%p, callback rtn=%p\n", __func__, chan, rtn); |
| 69 | |
| 70 | chan->callback_fn = rtn; |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn); |
| 75 | |
| 76 | int s3c2410_dma_setflags(unsigned int channel, unsigned int flags) |
| 77 | { |
| 78 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); |
| 79 | |
| 80 | if (chan == NULL) |
| 81 | return -EINVAL; |
| 82 | |
| 83 | chan->flags = flags; |
| 84 | return 0; |
| 85 | } |
| 86 | EXPORT_SYMBOL(s3c2410_dma_setflags); |