1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * (c) 1998 Grant R. Guenther <grant@torque.net>
4 *
5 * friq.c is a low-level protocol driver for the Freecom "IQ"
6 * parallel port IDE adapter. Early versions of this adapter
7 * use the 'frpw' protocol.
8 *
9 * Freecom uses this adapter in a battery powered external
10 * CD-ROM drive. It is also used in LS-120 drives by
11 * Maxell and Panasonic, and other devices.
12 *
13 * The battery powered drive requires software support to
14 * control the power to the drive. This module enables the
15 * drive power when the high level driver (pcd) is loaded
16 * and disables it when the module is unloaded. Note, if
17 * the friq module is built in to the kernel, the power
18 * will never be switched off, so other means should be
19 * used to conserve battery power.
20 */
21
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/delay.h>
25#include <linux/kernel.h>
26#include <linux/types.h>
27#include <linux/wait.h>
28#include <asm/io.h>
29#include "pata_parport.h"
30
31#define CMD(x) \
32 do { \
33 w2(4); w0(0xff); w0(0xff); w0(0x73); w0(0x73); \
34 w0(0xc9); w0(0xc9); w0(0x26); \
35 w0(0x26); w0(x); w0(x); \
36 } while (0)
37
38#define j44(l, h) (((l >> 4) & 0x0f) | (h & 0xf0))
39
40/*
41 * cont = 0 - access the IDE register file
42 * cont = 1 - access the IDE command set
43 */
44static int cont_map[2] = { 0x08, 0x10 };
45
46static int friq_read_regr(struct pi_adapter *pi, int cont, int regr)
47{
48 int h, l, r;
49
50 r = regr + cont_map[cont];
51
52 CMD(r);
53 w2(6); l = r1();
54 w2(4); h = r1();
55 w2(4);
56
57 return j44(l, h);
58}
59
60static void friq_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
61{
62 int r = regr + cont_map[cont];
63
64 CMD(r);
65 w0(val);
66 w2(5); w2(7); w2(5); w2(4);
67}
68
69static void friq_read_block_int(struct pi_adapter *pi, char *buf, int count, int regr)
70{
71 int h, l, k, ph;
72
73 switch (pi->mode) {
74 case 0:
75 CMD(regr);
76 for (k = 0; k < count; k++) {
77 w2(6); l = r1();
78 w2(4); h = r1();
79 buf[k] = j44(l, h);
80 }
81 w2(4);
82 break;
83 case 1:
84 ph = 2;
85 CMD(regr + 0xc0);
86 w0(0xff);
87 for (k = 0; k < count; k++) {
88 w2(0xa4 + ph);
89 buf[k] = r0();
90 ph = 2 - ph;
91 }
92 w2(0xac); w2(0xa4); w2(4);
93 break;
94 case 2:
95 CMD(regr + 0x80);
96 for (k = 0; k < count - 2; k++)
97 buf[k] = r4();
98 w2(0xac); w2(0xa4);
99 buf[count - 2] = r4();
100 buf[count - 1] = r4();
101 w2(4);
102 break;
103 case 3:
104 CMD(regr + 0x80);
105 for (k = 0; k < count / 2 - 1; k++)
106 ((u16 *)buf)[k] = r4w();
107 w2(0xac); w2(0xa4);
108 buf[count - 2] = r4();
109 buf[count - 1] = r4();
110 w2(4);
111 break;
112 case 4:
113 CMD(regr + 0x80);
114 for (k = 0; k < count / 4 - 1; k++)
115 ((u32 *)buf)[k] = r4l();
116 buf[count - 4] = r4();
117 buf[count - 3] = r4();
118 w2(0xac); w2(0xa4);
119 buf[count - 2] = r4();
120 buf[count - 1] = r4();
121 w2(4);
122 break;
123 }
124}
125
126static void friq_read_block(struct pi_adapter *pi, char *buf, int count)
127{
128 friq_read_block_int(pi, buf, count, regr: 0x08);
129}
130
131static void friq_write_block(struct pi_adapter *pi, char *buf, int count)
132{
133 int k;
134
135 switch (pi->mode) {
136 case 0:
137 case 1:
138 CMD(8); w2(5);
139 for (k = 0; k < count; k++) {
140 w0(buf[k]);
141 w2(7); w2(5);
142 }
143 w2(4);
144 break;
145 case 2:
146 CMD(0xc8); w2(5);
147 for (k = 0; k < count; k++)
148 w4(buf[k]);
149 w2(4);
150 break;
151 case 3:
152 CMD(0xc8); w2(5);
153 for (k = 0; k < count / 2; k++)
154 w4w(((u16 *)buf)[k]);
155 w2(4);
156 break;
157 case 4:
158 CMD(0xc8); w2(5);
159 for (k = 0; k < count / 4; k++)
160 w4l(((u32 *)buf)[k]);
161 w2(4);
162 break;
163}
164}
165
166static void friq_connect(struct pi_adapter *pi)
167{
168 pi->saved_r0 = r0();
169 pi->saved_r2 = r2();
170 w2(4);
171}
172
173static void friq_disconnect(struct pi_adapter *pi)
174{
175 CMD(0x20);
176 w0(pi->saved_r0);
177 w2(pi->saved_r2);
178}
179
180static int friq_test_proto(struct pi_adapter *pi)
181{
182 int j, k, r;
183 int e[2] = { 0, 0 };
184 char scratch[512];
185
186 pi->saved_r0 = r0();
187 w0(0xff); udelay(20); CMD(0x3d); /* turn the power on */
188 udelay(500);
189 w0(pi->saved_r0);
190
191 friq_connect(pi);
192 for (j = 0; j < 2; j++) {
193 friq_write_regr(pi, cont: 0, regr: 6, val: 0xa0 + j * 0x10);
194 for (k = 0; k < 256; k++) {
195 friq_write_regr(pi, cont: 0, regr: 2, val: k ^ 0xaa);
196 friq_write_regr(pi, cont: 0, regr: 3, val: k ^ 0x55);
197 if (friq_read_regr(pi, cont: 0, regr: 2) != (k ^ 0xaa))
198 e[j]++;
199 }
200 }
201 friq_disconnect(pi);
202
203 friq_connect(pi);
204 friq_read_block_int(pi, buf: scratch, count: 512, regr: 0x10);
205 r = 0;
206 for (k = 0; k < 128; k++) {
207 if (scratch[k] != k)
208 r++;
209 }
210 friq_disconnect(pi);
211
212 dev_dbg(&pi->dev,
213 "friq: port 0x%x, mode %d, test=(%d,%d,%d)\n",
214 pi->port, pi->mode, e[0], e[1], r);
215
216 return r || (e[0] && e[1]);
217}
218
219static void friq_log_adapter(struct pi_adapter *pi)
220{
221 char *mode_string[6] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32"};
222
223 dev_info(&pi->dev,
224 "Freecom IQ ASIC-2 adapter at 0x%x, mode %d (%s), delay %d\n",
225 pi->port, pi->mode, mode_string[pi->mode], pi->delay);
226
227 pi->private = 1;
228 friq_connect(pi);
229 CMD(0x9e); /* disable sleep timer */
230 friq_disconnect(pi);
231}
232
233static void friq_release_proto(struct pi_adapter *pi)
234{
235 if (pi->private) { /* turn off the power */
236 friq_connect(pi);
237 CMD(0x1d); CMD(0x1e);
238 friq_disconnect(pi);
239 pi->private = 0;
240 }
241}
242
243static struct pi_protocol friq = {
244 .owner = THIS_MODULE,
245 .name = "friq",
246 .max_mode = 5,
247 .epp_first = 2,
248 .default_delay = 1,
249 .max_units = 1,
250 .write_regr = friq_write_regr,
251 .read_regr = friq_read_regr,
252 .write_block = friq_write_block,
253 .read_block = friq_read_block,
254 .connect = friq_connect,
255 .disconnect = friq_disconnect,
256 .test_proto = friq_test_proto,
257 .log_adapter = friq_log_adapter,
258 .release_proto = friq_release_proto,
259};
260
261MODULE_LICENSE("GPL");
262MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
263MODULE_DESCRIPTION("Freecom IQ parallel port IDE adapter protocol driver");
264module_pata_parport_driver(friq);
265

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