1 /*
2 aten.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
4
5 aten.c is a low-level protocol driver for the ATEN EH-100
6 parallel port adapter. The EH-100 supports 4-bit and 8-bit
7 modes only. There is also an EH-132 which supports EPP mode
8 transfers. The EH-132 is not yet supported.
9
10 */
11
12 /* Changes:
13
14 1.01 GRG 1998.05.05 init_proto, release_proto
15
16 */
17
18 #define ATEN_VERSION "1.01"
19
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/delay.h>
23 #include <linux/kernel.h>
24 #include <linux/wait.h>
25 #include <linux/types.h>
26 #include <asm/io.h>
27
28 #include "paride.h"
29
30 #define j44(a,b) ((((a>>4)&0x0f)|(b&0xf0))^0x88)
31
32 /* cont = 0 - access the IDE register file
33 cont = 1 - access the IDE command set
34 */
35
36 static int cont_map[2] = { 0x08, 0x20 };
37
aten_write_regr(PIA * pi,int cont,int regr,int val)38 static void aten_write_regr( PIA *pi, int cont, int regr, int val)
39
40 { int r;
41
42 r = regr + cont_map[cont] + 0x80;
43
44 w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);
45 }
46
aten_read_regr(PIA * pi,int cont,int regr)47 static int aten_read_regr( PIA *pi, int cont, int regr )
48
49 { int a, b, r;
50
51 r = regr + cont_map[cont] + 0x40;
52
53 switch (pi->mode) {
54
55 case 0: w0(r); w2(0xe); w2(6);
56 w2(7); w2(6); w2(0);
57 a = r1(); w0(0x10); b = r1(); w2(0xc);
58 return j44(a,b);
59
60 case 1: r |= 0x10;
61 w0(r); w2(0xe); w2(6); w0(0xff);
62 w2(0x27); w2(0x26); w2(0x20);
63 a = r0();
64 w2(0x26); w2(0xc);
65 return a;
66 }
67 return -1;
68 }
69
aten_read_block(PIA * pi,char * buf,int count)70 static void aten_read_block( PIA *pi, char * buf, int count )
71
72 { int k, a, b, c, d;
73
74 switch (pi->mode) {
75
76 case 0: w0(0x48); w2(0xe); w2(6);
77 for (k=0;k<count/2;k++) {
78 w2(7); w2(6); w2(2);
79 a = r1(); w0(0x58); b = r1();
80 w2(0); d = r1(); w0(0x48); c = r1();
81 buf[2*k] = j44(c,d);
82 buf[2*k+1] = j44(a,b);
83 }
84 w2(0xc);
85 break;
86
87 case 1: w0(0x58); w2(0xe); w2(6);
88 for (k=0;k<count/2;k++) {
89 w2(0x27); w2(0x26); w2(0x22);
90 a = r0(); w2(0x20); b = r0();
91 buf[2*k] = b; buf[2*k+1] = a;
92 }
93 w2(0x26); w2(0xc);
94 break;
95 }
96 }
97
aten_write_block(PIA * pi,char * buf,int count)98 static void aten_write_block( PIA *pi, char * buf, int count )
99
100 { int k;
101
102 w0(0x88); w2(0xe); w2(6);
103 for (k=0;k<count/2;k++) {
104 w0(buf[2*k+1]); w2(0xe); w2(6);
105 w0(buf[2*k]); w2(7); w2(6);
106 }
107 w2(0xc);
108 }
109
aten_connect(PIA * pi)110 static void aten_connect ( PIA *pi )
111
112 { pi->saved_r0 = r0();
113 pi->saved_r2 = r2();
114 w2(0xc);
115 }
116
aten_disconnect(PIA * pi)117 static void aten_disconnect ( PIA *pi )
118
119 { w0(pi->saved_r0);
120 w2(pi->saved_r2);
121 }
122
aten_log_adapter(PIA * pi,char * scratch,int verbose)123 static void aten_log_adapter( PIA *pi, char * scratch, int verbose )
124
125 { char *mode_string[2] = {"4-bit","8-bit"};
126
127 printk("%s: aten %s, ATEN EH-100 at 0x%x, ",
128 pi->device,ATEN_VERSION,pi->port);
129 printk("mode %d (%s), delay %d\n",pi->mode,
130 mode_string[pi->mode],pi->delay);
131
132 }
133
134 static struct pi_protocol aten = {
135 .owner = THIS_MODULE,
136 .name = "aten",
137 .max_mode = 2,
138 .epp_first = 2,
139 .default_delay = 1,
140 .max_units = 1,
141 .write_regr = aten_write_regr,
142 .read_regr = aten_read_regr,
143 .write_block = aten_write_block,
144 .read_block = aten_read_block,
145 .connect = aten_connect,
146 .disconnect = aten_disconnect,
147 .log_adapter = aten_log_adapter,
148 };
149
aten_init(void)150 static int __init aten_init(void)
151 {
152 return paride_register(&aten);
153 }
154
aten_exit(void)155 static void __exit aten_exit(void)
156 {
157 paride_unregister( &aten );
158 }
159
160 MODULE_LICENSE("GPL");
161 module_init(aten_init)
162 module_exit(aten_exit)
163