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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*
aten.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
Under the terms of the GNU General Public License.
aten.c is a low-level protocol driver for the ATEN EH-100
parallel port adapter. The EH-100 supports 4-bit and 8-bit
modes only. There is also an EH-132 which supports EPP mode
transfers. The EH-132 is not yet supported.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/types.h>
#include <asm/io.h>
#include <linux/pata_parport.h>
#define j44(a,b) ((((a>>4)&0x0f)|(b&0xf0))^0x88)
/* cont = 0 - access the IDE register file
cont = 1 - access the IDE command set
*/
static int cont_map[2] = { 0x08, 0x20 };
static void aten_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{ int r;
r = regr + cont_map[cont] + 0x80;
w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);
}
static int aten_read_regr(struct pi_adapter *pi, int cont, int regr)
{ int a, b, r;
r = regr + cont_map[cont] + 0x40;
switch (pi->mode) {
case 0: w0(r); w2(0xe); w2(6);
w2(7); w2(6); w2(0);
a = r1(); w0(0x10); b = r1(); w2(0xc);
return j44(a,b);
case 1: r |= 0x10;
w0(r); w2(0xe); w2(6); w0(0xff);
w2(0x27); w2(0x26); w2(0x20);
a = r0();
w2(0x26); w2(0xc);
return a;
}
return -1;
}
static void aten_read_block(struct pi_adapter *pi, char *buf, int count)
{ int k, a, b, c, d;
switch (pi->mode) {
case 0: w0(0x48); w2(0xe); w2(6);
for (k=0;k<count/2;k++) {
w2(7); w2(6); w2(2);
a = r1(); w0(0x58); b = r1();
w2(0); d = r1(); w0(0x48); c = r1();
buf[2*k] = j44(c,d);
buf[2*k+1] = j44(a,b);
}
w2(0xc);
break;
case 1: w0(0x58); w2(0xe); w2(6);
for (k=0;k<count/2;k++) {
w2(0x27); w2(0x26); w2(0x22);
a = r0(); w2(0x20); b = r0();
buf[2*k] = b; buf[2*k+1] = a;
}
w2(0x26); w2(0xc);
break;
}
}
static void aten_write_block(struct pi_adapter *pi, char *buf, int count)
{ int k;
w0(0x88); w2(0xe); w2(6);
for (k=0;k<count/2;k++) {
w0(buf[2*k+1]); w2(0xe); w2(6);
w0(buf[2*k]); w2(7); w2(6);
}
w2(0xc);
}
static void aten_connect(struct pi_adapter *pi)
{ pi->saved_r0 = r0();
pi->saved_r2 = r2();
w2(0xc);
}
static void aten_disconnect(struct pi_adapter *pi)
{ w0(pi->saved_r0);
w2(pi->saved_r2);
}
static void aten_log_adapter(struct pi_adapter *pi)
{ char *mode_string[2] = {"4-bit","8-bit"};
dev_info(&pi->dev, "ATEN EH-100 at 0x%x, mode %d (%s), delay %d\n",
pi->port, pi->mode, mode_string[pi->mode], pi->delay);
}
static struct pi_protocol aten = {
.owner = THIS_MODULE,
.name = "aten",
.max_mode = 2,
.epp_first = 2,
.default_delay = 1,
.max_units = 1,
.write_regr = aten_write_regr,
.read_regr = aten_read_regr,
.write_block = aten_write_block,
.read_block = aten_read_block,
.connect = aten_connect,
.disconnect = aten_disconnect,
.log_adapter = aten_log_adapter,
};
MODULE_LICENSE("GPL");
module_pata_parport_driver(aten);
|
