File: /usr/src/linux/drivers/block/paride/on20.c
1 /*
2 on20.c (c) 1996-8 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
4
5 on20.c is a low-level protocol driver for the
6 Onspec 90c20 parallel to IDE adapter.
7 */
8
9 /* Changes:
10
11 1.01 GRG 1998.05.06 init_proto, release_proto
12
13 */
14
15 #define ON20_VERSION "1.01"
16
17 #include <linux/module.h>
18 #include <linux/delay.h>
19 #include <linux/kernel.h>
20 #include <linux/types.h>
21 #include <linux/wait.h>
22 #include <asm/io.h>
23
24 #include "paride.h"
25
26 #define op(f) w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);
27 #define vl(v) w2(4);w0(v);w2(5);w2(7);w2(5);w2(4);
28
29 #define j44(a,b) (((a>>4)&0x0f)|(b&0xf0))
30
31 /* cont = 0 - access the IDE register file
32 cont = 1 - access the IDE command set
33 */
34
35 static int on20_read_regr( PIA *pi, int cont, int regr )
36
37 { int h,l, r ;
38
39 r = (regr<<2) + 1 + cont;
40
41 op(1); vl(r); op(0);
42
43 switch (pi->mode) {
44
45 case 0: w2(4); w2(6); l = r1();
46 w2(4); w2(6); h = r1();
47 w2(4); w2(6); w2(4); w2(6); w2(4);
48 return j44(l,h);
49
50 case 1: w2(4); w2(0x26); r = r0();
51 w2(4); w2(0x26); w2(4);
52 return r;
53
54 }
55 return -1;
56 }
57
58 static void on20_write_regr( PIA *pi, int cont, int regr, int val )
59
60 { int r;
61
62 r = (regr<<2) + 1 + cont;
63
64 op(1); vl(r);
65 op(0); vl(val);
66 op(0); vl(val);
67 }
68
69 static void on20_connect ( PIA *pi)
70
71 { pi->saved_r0 = r0();
72 pi->saved_r2 = r2();
73
74 w2(4);w0(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4);
75 if (pi->mode) { op(2); vl(8); op(2); vl(9); }
76 else { op(2); vl(0); op(2); vl(8); }
77 }
78
79 static void on20_disconnect ( PIA *pi )
80
81 { w2(4);w0(7);w2(4);w2(0xc);w2(4);
82 w0(pi->saved_r0);
83 w2(pi->saved_r2);
84 }
85
86 static void on20_read_block( PIA *pi, char * buf, int count )
87
88 { int k, l, h;
89
90 op(1); vl(1); op(0);
91
92 for (k=0;k<count;k++)
93 if (pi->mode) {
94 w2(4); w2(0x26); buf[k] = r0();
95 } else {
96 w2(6); l = r1(); w2(4);
97 w2(6); h = r1(); w2(4);
98 buf[k] = j44(l,h);
99 }
100 w2(4);
101 }
102
103 static void on20_write_block( PIA *pi, char * buf, int count )
104
105 { int k;
106
107 op(1); vl(1); op(0);
108
109 for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); }
110 w2(4);
111 }
112
113 static void on20_log_adapter( PIA *pi, char * scratch, int verbose )
114
115 { char *mode_string[2] = {"4-bit","8-bit"};
116
117 printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ",
118 pi->device,ON20_VERSION,pi->port);
119 printk("mode %d (%s), delay %d\n",pi->mode,
120 mode_string[pi->mode],pi->delay);
121
122 }
123
124 static void on20_init_proto( PIA *pi)
125
126 { MOD_INC_USE_COUNT;
127 }
128
129 static void on20_release_proto( PIA *pi)
130
131 { MOD_DEC_USE_COUNT;
132 }
133
134 struct pi_protocol on20 = {"on20",0,2,2,1,1,
135 on20_write_regr,
136 on20_read_regr,
137 on20_write_block,
138 on20_read_block,
139 on20_connect,
140 on20_disconnect,
141 0,
142 0,
143 0,
144 on20_log_adapter,
145 on20_init_proto,
146 on20_release_proto
147 };
148
149
150 #ifdef MODULE
151
152 int init_module(void)
153
154 { return pi_register( &on20 ) - 1;
155 }
156
157 void cleanup_module(void)
158
159 { pi_unregister( &on20 );
160 }
161
162 #endif
163
164 /* end of on20.c */
165