diff options
Diffstat (limited to 'firmware/target/mips/ingenic_x1000/dma-x1000.h')
-rw-r--r-- | firmware/target/mips/ingenic_x1000/dma-x1000.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/firmware/target/mips/ingenic_x1000/dma-x1000.h b/firmware/target/mips/ingenic_x1000/dma-x1000.h new file mode 100644 index 0000000000..d836a0cf54 --- /dev/null +++ b/firmware/target/mips/ingenic_x1000/dma-x1000.h | |||
@@ -0,0 +1,69 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2021 Aidan MacDonald | ||
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 | #ifndef __DMA_X1000_H__ | ||
23 | #define __DMA_X1000_H__ | ||
24 | |||
25 | #include "x1000/dma.h" | ||
26 | #include "x1000/dma_chn.h" | ||
27 | #include <stdint.h> | ||
28 | |||
29 | /* Events passed to DMA callbacks */ | ||
30 | #define DMA_EVENT_NONE 0 /* Not used by DMA code but can be used as | ||
31 | * a sentinel value to indicate "no event" */ | ||
32 | #define DMA_EVENT_INTERRUPT 1 /* Interrupt on a non-final descriptor */ | ||
33 | #define DMA_EVENT_COMPLETE 2 /* Completed the final descriptor */ | ||
34 | #define DMA_EVENT_ERROR 3 /* Some kind of error occurred */ | ||
35 | |||
36 | /* All DMA channels which use interrupts must be statically defined here. | ||
37 | * The channel numbering should be contiguous, and lower channel numbers | ||
38 | * will have lower interrupt latency because they're serviced first. | ||
39 | * | ||
40 | * Channels >= DMA_NUM_USED_CHANNELS will NOT have interrupts serviced! | ||
41 | * Due to the possibility of address error interrupts that can occur even | ||
42 | * if no interrupts are requested on the channel, the unallocated channels | ||
43 | * cannot be used safely. | ||
44 | */ | ||
45 | #define DMA_CHANNEL_AUDIO 0 | ||
46 | #define DMA_CHANNEL_FBCOPY 1 | ||
47 | #define DMA_NUM_USED_CHANNELS 2 | ||
48 | |||
49 | struct dma_desc { | ||
50 | uint32_t cm; /* meaning and layout same as DMA_CHN_CM */ | ||
51 | uint32_t sa; /* source address */ | ||
52 | uint32_t ta; /* target address */ | ||
53 | uint32_t tc; /* low 24 bits: transfer count | ||
54 | * upper 8 bits: offset to next descriptor | ||
55 | */ | ||
56 | uint32_t sd; /* same as DMA_CHN_SD */ | ||
57 | uint32_t rt; /* request type, same as DMA_CHN_RT */ | ||
58 | uint32_t pad0; | ||
59 | uint32_t pad1; | ||
60 | } __attribute__((aligned(32))); | ||
61 | |||
62 | typedef struct dma_desc dma_desc; | ||
63 | |||
64 | typedef void(*dma_cb_func)(int event); | ||
65 | |||
66 | extern void dma_init(void); | ||
67 | extern void dma_set_callback(int chn, dma_cb_func cb); | ||
68 | |||
69 | #endif /* __DMA_X1000_H__ */ | ||