1 /*
2 ktti.c (c) 1998 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
4
5 ktti.c is a low-level protocol driver for the KT Technology
6 parallel port adapter. This adapter is used in the "PHd"
7 portable hard-drives. As far as I can tell, this device
8 supports 4-bit mode _only_.
9
10 */
11
12 #define KTTI_VERSION "1.0"
13
14 #include <linux/module.h>
15 #include <linux/delay.h>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/wait.h>
19 #include <asm/io.h>
20
21 #include "paride.h"
22
23 #define j44(a,b) (((a>>4)&0x0f)|(b&0xf0))
24
25 /* cont = 0 - access the IDE register file
26 cont = 1 - access the IDE command set
27 */
28
29 static int cont_map[2] = { 0x10, 0x08 };
30
ktti_write_regr(PIA * pi,int cont,int regr,int val)31 static void ktti_write_regr( PIA *pi, int cont, int regr, int val)
32
33 { int r;
34
35 r = regr + cont_map[cont];
36
37 w0(r); w2(0xb); w2(0xa); w2(3); w2(6);
38 w0(val); w2(3); w0(0); w2(6); w2(0xb);
39 }
40
ktti_read_regr(PIA * pi,int cont,int regr)41 static int ktti_read_regr( PIA *pi, int cont, int regr )
42
43 { int a, b, r;
44
45 r = regr + cont_map[cont];
46
47 w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
48 a = r1(); w2(0xc); b = r1(); w2(9); w2(0xc); w2(9);
49 return j44(a,b);
50
51 }
52
ktti_read_block(PIA * pi,char * buf,int count)53 static void ktti_read_block( PIA *pi, char * buf, int count )
54
55 { int k, a, b;
56
57 for (k=0;k<count/2;k++) {
58 w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
59 a = r1(); w2(0xc); b = r1(); w2(9);
60 buf[2*k] = j44(a,b);
61 a = r1(); w2(0xc); b = r1(); w2(9);
62 buf[2*k+1] = j44(a,b);
63 }
64 }
65
ktti_write_block(PIA * pi,char * buf,int count)66 static void ktti_write_block( PIA *pi, char * buf, int count )
67
68 { int k;
69
70 for (k=0;k<count/2;k++) {
71 w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);
72 w0(buf[2*k]); w2(3);
73 w0(buf[2*k+1]); w2(6);
74 w2(0xb);
75 }
76 }
77
ktti_connect(PIA * pi)78 static void ktti_connect ( PIA *pi )
79
80 { pi->saved_r0 = r0();
81 pi->saved_r2 = r2();
82 w2(0xb); w2(0xa); w0(0); w2(3); w2(6);
83 }
84
ktti_disconnect(PIA * pi)85 static void ktti_disconnect ( PIA *pi )
86
87 { w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);
88 w0(pi->saved_r0);
89 w2(pi->saved_r2);
90 }
91
ktti_log_adapter(PIA * pi,char * scratch,int verbose)92 static void ktti_log_adapter( PIA *pi, char * scratch, int verbose )
93
94 { printk("%s: ktti %s, KT adapter at 0x%x, delay %d\n",
95 pi->device,KTTI_VERSION,pi->port,pi->delay);
96
97 }
98
ktti_init_proto(PIA * pi)99 static void ktti_init_proto( PIA *pi)
100
101 { MOD_INC_USE_COUNT;
102 }
103
ktti_release_proto(PIA * pi)104 static void ktti_release_proto( PIA *pi)
105
106 { MOD_DEC_USE_COUNT;
107 }
108
109 struct pi_protocol ktti = {"ktti",0,1,2,1,1,
110 ktti_write_regr,
111 ktti_read_regr,
112 ktti_write_block,
113 ktti_read_block,
114 ktti_connect,
115 ktti_disconnect,
116 0,
117 0,
118 0,
119 ktti_log_adapter,
120 ktti_init_proto,
121 ktti_release_proto
122 };
123
124
125 #ifdef MODULE
126
init_module(void)127 int init_module(void)
128
129 { return pi_register( &ktti ) - 1;
130 }
131
cleanup_module(void)132 void cleanup_module(void)
133
134 { pi_unregister( &ktti );
135 }
136
137 #endif
138
139 /* end of ktti.c */
140 MODULE_LICENSE("GPL");
141