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/init.h>
19#include <linux/delay.h>
20#include <linux/kernel.h>
21#include <linux/types.h>
22#include <linux/wait.h>
23#include <asm/io.h>
24
25#include "paride.h"
26
27#define op(f)	w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);
28#define vl(v)	w2(4);w0(v);w2(5);w2(7);w2(5);w2(4);
29
30#define j44(a,b)  (((a>>4)&0x0f)|(b&0xf0))
31
32/* cont = 0 - access the IDE register file
33   cont = 1 - access the IDE command set
34*/
35
36static int on20_read_regr( PIA *pi, int cont, int regr )
37
38{	int h,l, r ;
39
40        r = (regr<<2) + 1 + cont;
41
42        op(1); vl(r); op(0);
43
44	switch (pi->mode)  {
45
46        case 0:  w2(4); w2(6); l = r1();
47                 w2(4); w2(6); h = r1();
48                 w2(4); w2(6); w2(4); w2(6); w2(4);
49		 return j44(l,h);
50
51	case 1:  w2(4); w2(0x26); r = r0();
52                 w2(4); w2(0x26); w2(4);
53		 return r;
54
55	}
56	return -1;
57}
58
59static void on20_write_regr( PIA *pi, int cont, int regr, int val )
60
61{	int r;
62
63	r = (regr<<2) + 1 + cont;
64
65	op(1); vl(r);
66	op(0); vl(val);
67	op(0); vl(val);
68}
69
70static void on20_connect ( PIA *pi)
71
72{	pi->saved_r0 = r0();
73        pi->saved_r2 = r2();
74
75	w2(4);w0(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4);
76	if (pi->mode) { op(2); vl(8); op(2); vl(9); }
77	       else   { op(2); vl(0); op(2); vl(8); }
78}
79
80static void on20_disconnect ( PIA *pi )
81
82{	w2(4);w0(7);w2(4);w2(0xc);w2(4);
83        w0(pi->saved_r0);
84        w2(pi->saved_r2);
85}
86
87static void on20_read_block( PIA *pi, char * buf, int count )
88
89{	int     k, l, h;
90
91	op(1); vl(1); op(0);
92
93	for (k=0;k<count;k++)
94	    if (pi->mode) {
95		w2(4); w2(0x26); buf[k] = r0();
96	    } else {
97		w2(6); l = r1(); w2(4);
98		w2(6); h = r1(); w2(4);
99		buf[k] = j44(l,h);
100	    }
101	w2(4);
102}
103
104static void on20_write_block(  PIA *pi, char * buf, int count )
105
106{	int	k;
107
108	op(1); vl(1); op(0);
109
110	for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); }
111	w2(4);
112}
113
114static void on20_log_adapter( PIA *pi, char * scratch, int verbose )
115
116{       char    *mode_string[2] = {"4-bit","8-bit"};
117
118        printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ",
119                pi->device,ON20_VERSION,pi->port);
120        printk("mode %d (%s), delay %d\n",pi->mode,
121		mode_string[pi->mode],pi->delay);
122
123}
124
125static struct pi_protocol on20 = {
126	.owner		= THIS_MODULE,
127	.name		= "on20",
128	.max_mode	= 2,
129	.epp_first	= 2,
130	.default_delay	= 1,
131	.max_units	= 1,
132	.write_regr	= on20_write_regr,
133	.read_regr	= on20_read_regr,
134	.write_block	= on20_write_block,
135	.read_block	= on20_read_block,
136	.connect	= on20_connect,
137	.disconnect	= on20_disconnect,
138	.log_adapter	= on20_log_adapter,
139};
140
141static int __init on20_init(void)
142{
143	return paride_register(&on20);
144}
145
146static void __exit on20_exit(void)
147{
148	paride_unregister(&on20);
149}
150
151MODULE_LICENSE("GPL");
152module_init(on20_init)
153module_exit(on20_exit)
154