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

source code of linux/drivers/ata/pata_parport/fit3.c