blob: 8eeaa81de0668cbb898bca660d344ffd148e0f28 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* 8237A DMA controller suspend functions.
*
* Written by Pierre Ossman, 2005.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*/
#include <linux/init.h>
#include <linux/syscore_ops.h>
#include <asm/dma.h>
/*
* This module just handles suspend/resume issues with the
* 8237A DMA controller (used for ISA and LPC).
* Allocation is handled in kernel/dma.c and normal usage is
* in asm/dma.h.
*/
static void i8237A_resume(void)
{
unsigned long flags;
int i;
flags = claim_dma_lock();
dma_outb(0, DMA1_RESET_REG);
dma_outb(0, DMA2_RESET_REG);
for (i = 0; i < 8; i++) {
set_dma_addr(i, 0x000000);
/* DMA count is a bit weird so this is not 0 */
set_dma_count(i, 1);
}
/* Enable cascade DMA or channel 0-3 won't work */
enable_dma(4);
release_dma_lock(flags);
}
static struct syscore_ops i8237_syscore_ops = {
.resume = i8237A_resume,
};
static int __init i8237A_init_ops(void)
{
register_syscore_ops(&i8237_syscore_ops);
return 0;
}
device_initcall(i8237A_init_ops);
|
