1 /* linux/arch/arm/plat-samsung/dma.c
2 *
3 * Copyright (c) 2003-2009 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 /* 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
s3c_dma_lookup_channel(unsigned int channel)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
s3c2410_dma_set_opfn(enum dma_ch channel,s3c2410_dma_opfn_t rtn)44 int s3c2410_dma_set_opfn(enum dma_ch channel, s3c2410_dma_opfn_t rtn)
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
s3c2410_dma_set_buffdone_fn(enum dma_ch channel,s3c2410_dma_cbfn_t rtn)59 int s3c2410_dma_set_buffdone_fn(enum dma_ch channel, s3c2410_dma_cbfn_t rtn)
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
s3c2410_dma_setflags(enum dma_ch channel,unsigned int flags)74 int s3c2410_dma_setflags(enum dma_ch channel, unsigned int flags)
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);
85