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b920de1b DH |
1 | /* MN10300 ISA DMA handlers and definitions |
2 | * | |
3 | * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | #ifndef _ASM_DMA_H | |
12 | #define _ASM_DMA_H | |
13 | ||
14 | #include <asm/system.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <asm/io.h> | |
17 | #include <linux/delay.h> | |
18 | ||
19 | #undef MAX_DMA_CHANNELS /* switch off linux/kernel/dma.c */ | |
20 | #define MAX_DMA_ADDRESS 0xbfffffff | |
21 | ||
22 | extern spinlock_t dma_spin_lock; | |
23 | ||
24 | static inline unsigned long claim_dma_lock(void) | |
25 | { | |
26 | unsigned long flags; | |
27 | spin_lock_irqsave(&dma_spin_lock, flags); | |
28 | return flags; | |
29 | } | |
30 | ||
31 | static inline void release_dma_lock(unsigned long flags) | |
32 | { | |
33 | spin_unlock_irqrestore(&dma_spin_lock, flags); | |
34 | } | |
35 | ||
36 | /* enable/disable a specific DMA channel */ | |
37 | static inline void enable_dma(unsigned int dmanr) | |
38 | { | |
39 | } | |
40 | ||
41 | static inline void disable_dma(unsigned int dmanr) | |
42 | { | |
43 | } | |
44 | ||
45 | /* Clear the 'DMA Pointer Flip Flop'. | |
46 | * Write 0 for LSB/MSB, 1 for MSB/LSB access. | |
47 | * Use this once to initialize the FF to a known state. | |
48 | * After that, keep track of it. :-) | |
49 | * --- In order to do that, the DMA routines below should --- | |
50 | * --- only be used while holding the DMA lock ! --- | |
51 | */ | |
52 | static inline void clear_dma_ff(unsigned int dmanr) | |
53 | { | |
54 | } | |
55 | ||
56 | /* set mode (above) for a specific DMA channel */ | |
57 | static inline void set_dma_mode(unsigned int dmanr, char mode) | |
58 | { | |
59 | } | |
60 | ||
61 | /* Set only the page register bits of the transfer address. | |
62 | * This is used for successive transfers when we know the contents of | |
63 | * the lower 16 bits of the DMA current address register, but a 64k boundary | |
64 | * may have been crossed. | |
65 | */ | |
66 | static inline void set_dma_page(unsigned int dmanr, char pagenr) | |
67 | { | |
68 | } | |
69 | ||
70 | ||
71 | /* Set transfer address & page bits for specific DMA channel. | |
72 | * Assumes dma flipflop is clear. | |
73 | */ | |
74 | static inline void set_dma_addr(unsigned int dmanr, unsigned int a) | |
75 | { | |
76 | } | |
77 | ||
78 | ||
79 | /* Set transfer size (max 64k for DMA1..3, 128k for DMA5..7) for | |
80 | * a specific DMA channel. | |
81 | * You must ensure the parameters are valid. | |
82 | * NOTE: from a manual: "the number of transfers is one more | |
83 | * than the initial word count"! This is taken into account. | |
84 | * Assumes dma flip-flop is clear. | |
85 | * NOTE 2: "count" represents _bytes_ and must be even for channels 5-7. | |
86 | */ | |
87 | static inline void set_dma_count(unsigned int dmanr, unsigned int count) | |
88 | { | |
89 | } | |
90 | ||
91 | ||
92 | /* Get DMA residue count. After a DMA transfer, this | |
93 | * should return zero. Reading this while a DMA transfer is | |
94 | * still in progress will return unpredictable results. | |
95 | * If called before the channel has been used, it may return 1. | |
96 | * Otherwise, it returns the number of _bytes_ left to transfer. | |
97 | * | |
98 | * Assumes DMA flip-flop is clear. | |
99 | */ | |
100 | static inline int get_dma_residue(unsigned int dmanr) | |
101 | { | |
102 | return 0; | |
103 | } | |
104 | ||
105 | ||
106 | /* These are in kernel/dma.c: */ | |
107 | extern int request_dma(unsigned int dmanr, const char *device_id); | |
108 | extern void free_dma(unsigned int dmanr); | |
109 | ||
110 | /* From PCI */ | |
111 | ||
112 | #ifdef CONFIG_PCI | |
113 | extern int isa_dma_bridge_buggy; | |
114 | #else | |
115 | #define isa_dma_bridge_buggy (0) | |
116 | #endif | |
117 | ||
118 | #endif /* _ASM_DMA_H */ |