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
29static int  cont_map[2] = { 0x10, 0x08 };
30
31static 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
41static 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
53static 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
66static 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
78static 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
85static 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
92static 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
99static void ktti_init_proto( PIA *pi)
100
101{       MOD_INC_USE_COUNT;
102}
103
104static void ktti_release_proto( PIA *pi)
105
106{       MOD_DEC_USE_COUNT;
107}
108
109struct 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
127int     init_module(void)
128
129{       return pi_register( &ktti ) - 1;
130}
131
132void    cleanup_module(void)
133
134{       pi_unregister( &ktti );
135}
136
137#endif
138
139/* end of ktti.c */
140MODULE_LICENSE("GPL");
141