1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * (c) 1998  Grant R. Guenther <grant@torque.net>
4 *
5 * fit3.c is a low-level protocol driver for newer models
6 * of the Fidelity International Technology parallel port adapter.
7 * This adapter is used in their TransDisk 3000 portable
8 * hard-drives, as well as CD-ROM, PD-CD and other devices.
9 *
10 * The TD-2000 and certain older devices use a different protocol.
11 * Try the fit2 protocol module with them.
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/delay.h>
17#include <linux/kernel.h>
18#include <linux/types.h>
19#include <linux/wait.h>
20#include <asm/io.h>
21#include "pata_parport.h"
22
23#define j44(a, b)	(((a >> 3) & 0x0f) | ((b << 1) & 0xf0))
24
25#define w7(byte)	out_p(7, byte)
26#define r7()		(in_p(7) & 0xff)
27
28/*
29 * cont = 0 - access the IDE register file
30 * cont = 1 - access the IDE command set
31 */
32
33static void fit3_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
34{
35	regr += cont << 3;
36
37	switch (pi->mode) {
38	case 0:
39	case 1:
40		w2(0xc); w0(regr); w2(0x8); w2(0xc);
41		w0(val); w2(0xd);
42		w0(0);   w2(0xc);
43		break;
44	case 2:
45		w2(0xc); w0(regr); w2(0x8); w2(0xc);
46		w4(val); w4(0);
47		w2(0xc);
48		break;
49	}
50}
51
52static int fit3_read_regr(struct pi_adapter *pi, int cont, int regr)
53{
54	int  a, b;
55
56	regr += cont << 3;
57
58	switch (pi->mode) {
59	case 0:
60		w2(0xc); w0(regr + 0x10); w2(0x8); w2(0xc);
61		w2(0xd); a = r1();
62		w2(0xf); b = r1();
63		w2(0xc);
64		return j44(a, b);
65	case 1:
66		w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
67		w2(0xec); w2(0xee); w2(0xef); a = r0();
68		w2(0xc);
69		return a;
70	case 2:
71		w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
72		w2(0xec);
73		a = r4(); b = r4();
74		w2(0xc);
75		return a;
76	}
77
78	return -1;
79}
80
81static void fit3_read_block(struct pi_adapter *pi, char *buf, int count)
82{
83	int  k, a, b, c, d;
84
85	switch (pi->mode) {
86	case 0:
87		w2(0xc); w0(0x10); w2(0x8); w2(0xc);
88		for (k = 0; k < count / 2; k++) {
89			w2(0xd); a = r1();
90			w2(0xf); b = r1();
91			w2(0xc); c = r1();
92			w2(0xe); d = r1();
93			buf[2 * k] = j44(a, b);
94			buf[2 * k + 1] = j44(c, d);
95		}
96		w2(0xc);
97		break;
98	case 1:
99		w2(0xc); w0(0x90); w2(0x8); w2(0xc);
100		w2(0xec); w2(0xee);
101		for (k = 0; k < count / 2; k++) {
102			w2(0xef); a = r0();
103			w2(0xee); b = r0();
104			buf[2 * k] = a;
105			buf[2 * k + 1] = b;
106		}
107		w2(0xec);
108		w2(0xc);
109		break;
110	case 2:
111		w2(0xc); w0(0x90); w2(0x8); w2(0xc);
112		w2(0xec);
113		for (k = 0; k < count; k++)
114			buf[k] = r4();
115		w2(0xc);
116		break;
117	}
118}
119
120static void fit3_write_block(struct pi_adapter *pi, char *buf, int count)
121{
122	int k;
123
124	switch (pi->mode) {
125	case 0:
126	case 1:
127		w2(0xc); w0(0); w2(0x8); w2(0xc);
128		for (k = 0; k < count / 2; k++) {
129			w0(buf[2 * k]); w2(0xd);
130			w0(buf[2 * k + 1]); w2(0xc);
131		}
132		break;
133	case 2:
134		w2(0xc); w0(0); w2(0x8); w2(0xc);
135		for (k = 0; k < count; k++)
136			w4(buf[k]);
137		w2(0xc);
138		break;
139	}
140}
141
142static void fit3_connect(struct pi_adapter *pi)
143{
144	pi->saved_r0 = r0();
145	pi->saved_r2 = r2();
146	w2(0xc); w0(0); w2(0xa);
147	if (pi->mode == 2) {
148		w2(0xc); w0(0x9);
149		w2(0x8); w2(0xc);
150	}
151}
152
153static void fit3_disconnect(struct pi_adapter *pi)
154{
155	w2(0xc); w0(0xa); w2(0x8); w2(0xc);
156	w0(pi->saved_r0);
157	w2(pi->saved_r2);
158}
159
160static void fit3_log_adapter(struct pi_adapter *pi)
161{
162	char *mode_string[3] = { "4-bit", "8-bit", "EPP"};
163
164	dev_info(&pi->dev,
165		 "FIT 3000 adapter at 0x%x, mode %d (%s), delay %d\n",
166		 pi->port, pi->mode, mode_string[pi->mode], pi->delay);
167}
168
169static struct pi_protocol fit3 = {
170	.owner		= THIS_MODULE,
171	.name		= "fit3",
172	.max_mode	= 3,
173	.epp_first	= 2,
174	.default_delay	= 1,
175	.max_units	= 1,
176	.write_regr	= fit3_write_regr,
177	.read_regr	= fit3_read_regr,
178	.write_block	= fit3_write_block,
179	.read_block	= fit3_read_block,
180	.connect	= fit3_connect,
181	.disconnect	= fit3_disconnect,
182	.log_adapter	= fit3_log_adapter,
183};
184
185MODULE_LICENSE("GPL");
186MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
187MODULE_DESCRIPTION("Fidelity International Technology parallel port IDE adapter"
188		   "(newer models) protocol driver");
189module_pata_parport_driver(fit3);
190