diff options
Diffstat (limited to 'firmware/target/arm/tms320dm320/dma-dm320.c')
-rw-r--r-- | firmware/target/arm/tms320dm320/dma-dm320.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/firmware/target/arm/tms320dm320/dma-dm320.c b/firmware/target/arm/tms320dm320/dma-dm320.c new file mode 100644 index 0000000000..e60102b6fb --- /dev/null +++ b/firmware/target/arm/tms320dm320/dma-dm320.c | |||
@@ -0,0 +1,78 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id: $ | ||
9 | * | ||
10 | * Copyright (C) 2011 by Tomasz Moń | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | |||
22 | #include "config.h" | ||
23 | #include "kernel.h" | ||
24 | #include "thread.h" | ||
25 | #include "system.h" | ||
26 | #include "dma-target.h" | ||
27 | #include "dm320.h" | ||
28 | #include <stdbool.h> | ||
29 | |||
30 | void dma_init(void) | ||
31 | { | ||
32 | /* TODO */ | ||
33 | } | ||
34 | |||
35 | /* | ||
36 | Requests channel for peripheral. | ||
37 | Returns channel assigned for caller which must be released after | ||
38 | transfer complete using dma_release_channel(). | ||
39 | */ | ||
40 | int dma_request_channel(int peripheral, int mode) | ||
41 | { | ||
42 | /* TODO: proper checking if channel is already taken | ||
43 | currently only SDMMC and DSP uses DMA on this target */ | ||
44 | int channel = -1; | ||
45 | |||
46 | if (peripheral == DMA_PERIPHERAL_MMCSD) | ||
47 | { | ||
48 | /* Set first DMA channel */ | ||
49 | IO_SDRAM_SDDMASEL = (IO_SDRAM_SDDMASEL & 0xFFE0) | peripheral | | ||
50 | (mode << 3); | ||
51 | channel = 1; | ||
52 | } | ||
53 | else if (peripheral == DMA_PERIPHERAL_DSP) | ||
54 | { | ||
55 | /* Set second DMA channel */ | ||
56 | IO_SDRAM_SDDMASEL = (IO_SDRAM_SDDMASEL & 0xFC1F) | | ||
57 | (peripheral << 5) | | ||
58 | (mode << 8); | ||
59 | channel = 2; | ||
60 | } | ||
61 | else if (peripheral == DMA_PERIPHERAL_SIF) | ||
62 | { | ||
63 | IO_SDRAM_SDDMASEL = (IO_SDRAM_SDDMASEL & 0x83FF) | | ||
64 | (peripheral << 10) | | ||
65 | (mode << 13); | ||
66 | channel = 3; | ||
67 | } | ||
68 | |||
69 | return channel; | ||
70 | } | ||
71 | |||
72 | void dma_release_channel(int channel) | ||
73 | { | ||
74 | (void)channel; | ||
75 | /* TODO */ | ||
76 | } | ||
77 | |||
78 | |||