Commit | Line | Data |
---|---|---|
6c6971dc | 1 | /* linux/arch/arm/plat-samsung/dma.c |
97c1b145 | 2 | * |
ccae941e | 3 | * Copyright (c) 2003-2009 Simtec Electronics |
97c1b145 BD |
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 | ||
97c1b145 BD |
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]; | |
26 | ||
27 | /* s3c_dma_lookup_channel | |
28 | * | |
29 | * change the dma channel number given into a real dma channel id | |
30 | */ | |
31 | ||
32 | struct s3c2410_dma_chan *s3c_dma_lookup_channel(unsigned int channel) | |
33 | { | |
34 | if (channel & DMACH_LOW_LEVEL) | |
35 | return &s3c2410_chans[channel & ~DMACH_LOW_LEVEL]; | |
36 | else | |
37 | return s3c_dma_chan_map[channel]; | |
38 | } | |
39 | ||
40 | /* do we need to protect the settings of the fields from | |
41 | * irq? | |
42 | */ | |
43 | ||
d670ac01 | 44 | int s3c2410_dma_set_opfn(enum dma_ch channel, s3c2410_dma_opfn_t rtn) |
97c1b145 BD |
45 | { |
46 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); | |
47 | ||
48 | if (chan == NULL) | |
49 | return -EINVAL; | |
50 | ||
51 | pr_debug("%s: chan=%p, op rtn=%p\n", __func__, chan, rtn); | |
52 | ||
53 | chan->op_fn = rtn; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | EXPORT_SYMBOL(s3c2410_dma_set_opfn); | |
58 | ||
d670ac01 | 59 | int s3c2410_dma_set_buffdone_fn(enum dma_ch channel, s3c2410_dma_cbfn_t rtn) |
97c1b145 BD |
60 | { |
61 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); | |
62 | ||
63 | if (chan == NULL) | |
64 | return -EINVAL; | |
65 | ||
66 | pr_debug("%s: chan=%p, callback rtn=%p\n", __func__, chan, rtn); | |
67 | ||
68 | chan->callback_fn = rtn; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn); | |
73 | ||
d670ac01 | 74 | int s3c2410_dma_setflags(enum dma_ch channel, unsigned int flags) |
97c1b145 BD |
75 | { |
76 | struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel); | |
77 | ||
78 | if (chan == NULL) | |
79 | return -EINVAL; | |
80 | ||
81 | chan->flags = flags; | |
82 | return 0; | |
83 | } | |
84 | EXPORT_SYMBOL(s3c2410_dma_setflags); |