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
36static int  cont_map[2] = { 0x08, 0x20 };
37
38static 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
47static 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
70static 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
98static 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
110static void aten_connect ( PIA *pi  )
111
112{       pi->saved_r0 = r0();
113        pi->saved_r2 = r2();
114	w2(0xc);
115}
116
117static void aten_disconnect ( PIA *pi )
118
119{       w0(pi->saved_r0);
120        w2(pi->saved_r2);
121}
122
123static 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
134static 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
150static int __init aten_init(void)
151{
152	return paride_register(&aten);
153}
154
155static void __exit aten_exit(void)
156{
157	paride_unregister( &aten );
158}
159
160MODULE_LICENSE("GPL");
161module_init(aten_init)
162module_exit(aten_exit)
163