diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sh/drivers/dma/dma-isa.c |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/sh/drivers/dma/dma-isa.c')
-rw-r--r-- | arch/sh/drivers/dma/dma-isa.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/sh/drivers/dma/dma-isa.c b/arch/sh/drivers/dma/dma-isa.c new file mode 100644 index 000000000000..1c9bc45b8bcb --- /dev/null +++ b/arch/sh/drivers/dma/dma-isa.c | |||
@@ -0,0 +1,106 @@ | |||
1 | /* | ||
2 | * arch/sh/drivers/dma/dma-isa.c | ||
3 | * | ||
4 | * Generic ISA DMA wrapper for SH DMA API | ||
5 | * | ||
6 | * Copyright (C) 2003, 2004 Paul Mundt | ||
7 | * | ||
8 | * This file is subject to the terms and conditions of the GNU General Public | ||
9 | * License. See the file "COPYING" in the main directory of this archive | ||
10 | * for more details. | ||
11 | */ | ||
12 | #include <linux/kernel.h> | ||
13 | #include <linux/module.h> | ||
14 | #include <asm/dma.h> | ||
15 | |||
16 | /* | ||
17 | * This implements a small wrapper set to make code using the old ISA DMA API | ||
18 | * work with the SH DMA API. Since most of the work in the new API happens | ||
19 | * at ops->xfer() time, we simply use the various set_dma_xxx() routines to | ||
20 | * fill in per-channel info, and then hand hand this off to ops->xfer() at | ||
21 | * enable_dma() time. | ||
22 | * | ||
23 | * For channels that are doing on-demand data transfer via cascading, the | ||
24 | * channel itself will still need to be configured through the new API. As | ||
25 | * such, this code is meant for only the simplest of tasks (and shouldn't be | ||
26 | * used in any new drivers at all). | ||
27 | * | ||
28 | * It should also be noted that various functions here are labelled as | ||
29 | * being deprecated. This is due to the fact that the ops->xfer() method is | ||
30 | * the preferred way of doing things (as well as just grabbing the spinlock | ||
31 | * directly). As such, any users of this interface will be warned rather | ||
32 | * loudly. | ||
33 | */ | ||
34 | |||
35 | unsigned long __deprecated claim_dma_lock(void) | ||
36 | { | ||
37 | unsigned long flags; | ||
38 | |||
39 | spin_lock_irqsave(&dma_spin_lock, flags); | ||
40 | |||
41 | return flags; | ||
42 | } | ||
43 | EXPORT_SYMBOL(claim_dma_lock); | ||
44 | |||
45 | void __deprecated release_dma_lock(unsigned long flags) | ||
46 | { | ||
47 | spin_unlock_irqrestore(&dma_spin_lock, flags); | ||
48 | } | ||
49 | EXPORT_SYMBOL(release_dma_lock); | ||
50 | |||
51 | void __deprecated disable_dma(unsigned int chan) | ||
52 | { | ||
53 | /* Nothing */ | ||
54 | } | ||
55 | EXPORT_SYMBOL(disable_dma); | ||
56 | |||
57 | void __deprecated enable_dma(unsigned int chan) | ||
58 | { | ||
59 | struct dma_info *info = get_dma_info(chan); | ||
60 | struct dma_channel *channel = &info->channels[chan]; | ||
61 | |||
62 | info->ops->xfer(channel); | ||
63 | } | ||
64 | EXPORT_SYMBOL(enable_dma); | ||
65 | |||
66 | void clear_dma_ff(unsigned int chan) | ||
67 | { | ||
68 | /* Nothing */ | ||
69 | } | ||
70 | EXPORT_SYMBOL(clear_dma_ff); | ||
71 | |||
72 | void set_dma_mode(unsigned int chan, char mode) | ||
73 | { | ||
74 | struct dma_info *info = get_dma_info(chan); | ||
75 | struct dma_channel *channel = &info->channels[chan]; | ||
76 | |||
77 | channel->mode = mode; | ||
78 | } | ||
79 | EXPORT_SYMBOL(set_dma_mode); | ||
80 | |||
81 | void set_dma_addr(unsigned int chan, unsigned int addr) | ||
82 | { | ||
83 | struct dma_info *info = get_dma_info(chan); | ||
84 | struct dma_channel *channel = &info->channels[chan]; | ||
85 | |||
86 | /* | ||
87 | * Single address mode is the only thing supported through | ||
88 | * this interface. | ||
89 | */ | ||
90 | if ((channel->mode & DMA_MODE_MASK) == DMA_MODE_READ) { | ||
91 | channel->sar = addr; | ||
92 | } else { | ||
93 | channel->dar = addr; | ||
94 | } | ||
95 | } | ||
96 | EXPORT_SYMBOL(set_dma_addr); | ||
97 | |||
98 | void set_dma_count(unsigned int chan, unsigned int count) | ||
99 | { | ||
100 | struct dma_info *info = get_dma_info(chan); | ||
101 | struct dma_channel *channel = &info->channels[chan]; | ||
102 | |||
103 | channel->count = count; | ||
104 | } | ||
105 | EXPORT_SYMBOL(set_dma_count); | ||
106 | |||