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 | */ |
44 | static int cont_map[2] = { 0x08, 0x10 }; |
45 | |
46 | static 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 | |
60 | static 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 | |
69 | static 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 | |
126 | static 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 | |
131 | static 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 | |
166 | static void friq_connect(struct pi_adapter *pi) |
167 | { |
168 | pi->saved_r0 = r0(); |
169 | pi->saved_r2 = r2(); |
170 | w2(4); |
171 | } |
172 | |
173 | static void friq_disconnect(struct pi_adapter *pi) |
174 | { |
175 | CMD(0x20); |
176 | w0(pi->saved_r0); |
177 | w2(pi->saved_r2); |
178 | } |
179 | |
180 | static 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 | |
219 | static 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 | |
233 | static 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 | |
243 | static 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 | |
261 | MODULE_LICENSE("GPL" ); |
262 | MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>" ); |
263 | MODULE_DESCRIPTION("Freecom IQ parallel port IDE adapter protocol driver" ); |
264 | module_pata_parport_driver(friq); |
265 | |