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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*
* arch/arm/kernel/dma-ebsa285.c
*
* Copyright (C) 1998 Phil Blundell
*
* DMA functions specific to EBSA-285/CATS architectures
*
* Changelog:
* 09-Nov-1998 RMK Split out ISA DMA functions to dma-isa.c
* 17-Mar-1999 RMK Allow any EBSA285-like architecture to have
* ISA DMA controllers.
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <asm/dma.h>
#include <asm/io.h>
#include "dma.h"
#include "dma-isa.h"
#ifdef CONFIG_ISA_DMA
static int has_isa_dma;
#else
#define has_isa_dma 0
#endif
int arch_request_dma(dmach_t channel, dma_t *dma, const char *dev_name)
{
switch (channel) {
case _DC21285_DMA(0):
case _DC21285_DMA(1): /* 21285 internal channels */
return 0;
case _ISA_DMA(0) ... _ISA_DMA(7):
if (has_isa_dma)
return isa_request_dma(channel - _ISA_DMA(0), dma, dev_name);
}
return -EINVAL;
}
void arch_free_dma(dmach_t channel, dma_t *dma)
{
/* nothing to do */
}
int arch_get_dma_residue(dmach_t channel, dma_t *dma)
{
int residue = 0;
switch (channel) {
case _DC21285_DMA(0):
case _DC21285_DMA(1):
break;
case _ISA_DMA(0) ... _ISA_DMA(7):
if (has_isa_dma)
residue = isa_get_dma_residue(channel - _ISA_DMA(0), dma);
}
return residue;
}
void arch_enable_dma(dmach_t channel, dma_t *dma)
{
switch (channel) {
case _DC21285_DMA(0):
case _DC21285_DMA(1):
/*
* Not yet implemented
*/
break;
case _ISA_DMA(0) ... _ISA_DMA(7):
if (has_isa_dma)
isa_enable_dma(channel - _ISA_DMA(0), dma);
}
}
void arch_disable_dma(dmach_t channel, dma_t *dma)
{
switch (channel) {
case _DC21285_DMA(0):
case _DC21285_DMA(1):
/*
* Not yet implemented
*/
break;
case _ISA_DMA(0) ... _ISA_DMA(7):
if (has_isa_dma)
isa_disable_dma(channel - _ISA_DMA(0), dma);
}
}
int arch_set_dma_speed(dmach_t channel, dma_t *dma, int cycle_ns)
{
return 0;
}
void __init arch_dma_init(dma_t *dma)
{
#ifdef CONFIG_ISA_DMA
has_isa_dma = isa_init_dma();
#endif
}
|
