1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * (c) 1997-1998 Grant R. Guenther <grant@torque.net> |
4 | * |
5 | * on26.c is a low-level protocol driver for the |
6 | * OnSpec 90c26 parallel to IDE adapter chip. |
7 | */ |
8 | |
9 | #include <linux/module.h> |
10 | #include <linux/init.h> |
11 | #include <linux/delay.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/types.h> |
14 | #include <linux/wait.h> |
15 | #include <asm/io.h> |
16 | #include "pata_parport.h" |
17 | |
18 | /* |
19 | * mode codes: 0 nybble reads, 8-bit writes |
20 | * 1 8-bit reads and writes |
21 | * 2 8-bit EPP mode |
22 | * 3 EPP-16 |
23 | * 4 EPP-32 |
24 | */ |
25 | |
26 | #define j44(a, b) (((a >> 4) & 0x0f) | (b & 0xf0)) |
27 | |
28 | #define P1 \ |
29 | do { \ |
30 | w2(5); w2(0xd); w2(5); w2(0xd); w2(5); w2(4); \ |
31 | } while (0) |
32 | |
33 | #define P2 \ |
34 | do { \ |
35 | w2(5); w2(7); w2(5); w2(4); \ |
36 | } while (0) |
37 | |
38 | /* |
39 | * cont = 0 - access the IDE register file |
40 | * cont = 1 - access the IDE command set |
41 | */ |
42 | |
43 | static int on26_read_regr(struct pi_adapter *pi, int cont, int regr) |
44 | { |
45 | int a, b, r; |
46 | |
47 | r = (regr << 2) + 1 + cont; |
48 | |
49 | switch (pi->mode) { |
50 | case 0: |
51 | w0(1); P1; w0(r); P2; w0(0); P1; |
52 | w2(6); a = r1(); w2(4); |
53 | w2(6); b = r1(); w2(4); |
54 | w2(6); w2(4); w2(6); w2(4); |
55 | return j44(a, b); |
56 | case 1: |
57 | w0(1); P1; w0(r); P2; w0(0); P1; |
58 | w2(0x26); a = r0(); w2(4); w2(0x26); w2(4); |
59 | return a; |
60 | case 2: |
61 | case 3: |
62 | case 4: |
63 | w3(1); w3(1); w2(5); w4(r); w2(4); |
64 | w3(0); w3(0); w2(0x24); a = r4(); w2(4); |
65 | w2(0x24); (void)r4(); w2(4); |
66 | return a; |
67 | } |
68 | |
69 | return -1; |
70 | } |
71 | |
72 | static void on26_write_regr(struct pi_adapter *pi, int cont, int regr, int val) |
73 | { |
74 | int r = (regr << 2) + 1 + cont; |
75 | |
76 | switch (pi->mode) { |
77 | case 0: |
78 | case 1: |
79 | w0(1); P1; w0(r); P2; w0(0); P1; |
80 | w0(val); P2; w0(val); P2; |
81 | break; |
82 | case 2: |
83 | case 3: |
84 | case 4: |
85 | w3(1); w3(1); w2(5); w4(r); w2(4); |
86 | w3(0); w3(0); |
87 | w2(5); w4(val); w2(4); |
88 | w2(5); w4(val); w2(4); |
89 | break; |
90 | } |
91 | } |
92 | |
93 | #define CCP(x) \ |
94 | do { \ |
95 | w0(0xfe); w0(0xaa); w0(0x55); w0(0); \ |
96 | w0(0xff); w0(0x87); w0(0x78); w0(x); \ |
97 | w2(4); w2(5); w2(4); w0(0xff); \ |
98 | } while (0) |
99 | |
100 | static void on26_connect(struct pi_adapter *pi) |
101 | { |
102 | int x; |
103 | |
104 | pi->saved_r0 = r0(); |
105 | pi->saved_r2 = r2(); |
106 | |
107 | CCP(0x20); |
108 | if (pi->mode) |
109 | x = 9; |
110 | else |
111 | x = 8; |
112 | |
113 | w0(2); P1; w0(8); P2; |
114 | w0(2); P1; w0(x); P2; |
115 | } |
116 | |
117 | static void on26_disconnect(struct pi_adapter *pi) |
118 | { |
119 | if (pi->mode >= 2) { |
120 | w3(4); w3(4); w3(4); w3(4); |
121 | } else { |
122 | w0(4); P1; w0(4); P1; |
123 | } |
124 | CCP(0x30); |
125 | w0(pi->saved_r0); |
126 | w2(pi->saved_r2); |
127 | } |
128 | |
129 | #define RESET_WAIT 200 |
130 | |
131 | /* hard reset */ |
132 | static int on26_test_port(struct pi_adapter *pi) |
133 | { |
134 | int i, m, d, x = 0, y = 0; |
135 | |
136 | pi->saved_r0 = r0(); |
137 | pi->saved_r2 = r2(); |
138 | |
139 | d = pi->delay; |
140 | m = pi->mode; |
141 | pi->delay = 5; |
142 | pi->mode = 0; |
143 | |
144 | w2(0xc); |
145 | |
146 | CCP(0x30); CCP(0); |
147 | |
148 | w0(0xfe); w0(0xaa); w0(0x55); w0(0); w0(0xff); |
149 | i = ((r1() & 0xf0) << 4); w0(0x87); |
150 | i |= (r1() & 0xf0); w0(0x78); |
151 | w0(0x20); w2(4); w2(5); |
152 | i |= ((r1() & 0xf0) >> 4); |
153 | w2(4); w0(0xff); |
154 | |
155 | if (i == 0xb5f) { |
156 | w0(2); P1; w0(0); P2; |
157 | w0(3); P1; w0(0); P2; |
158 | w0(2); P1; w0(8); P2; udelay(100); |
159 | w0(2); P1; w0(0xa); P2; udelay(100); |
160 | w0(2); P1; w0(8); P2; udelay(1000); |
161 | |
162 | on26_write_regr(pi, cont: 0, regr: 6, val: 0xa0); |
163 | |
164 | for (i = 0; i < RESET_WAIT; i++) { |
165 | on26_write_regr(pi, cont: 0, regr: 6, val: 0xa0); |
166 | x = on26_read_regr(pi, cont: 0, regr: 7); |
167 | on26_write_regr(pi, cont: 0, regr: 6, val: 0xb0); |
168 | y = on26_read_regr(pi, cont: 0, regr: 7); |
169 | if (!((x & 0x80) || (y & 0x80))) |
170 | break; |
171 | mdelay(100); |
172 | } |
173 | |
174 | if (i == RESET_WAIT) |
175 | dev_err(&pi->dev, |
176 | "on26: Device reset failed (%x,%x)\n" , x, y); |
177 | |
178 | w0(4); P1; w0(4); P1; |
179 | } |
180 | |
181 | CCP(0x30); |
182 | |
183 | pi->delay = d; |
184 | pi->mode = m; |
185 | w0(pi->saved_r0); |
186 | w2(pi->saved_r2); |
187 | |
188 | return 5; |
189 | } |
190 | |
191 | static void on26_read_block(struct pi_adapter *pi, char *buf, int count) |
192 | { |
193 | int k, a, b; |
194 | |
195 | switch (pi->mode) { |
196 | case 0: |
197 | w0(1); P1; w0(1); P2; w0(2); P1; w0(0x18); P2; w0(0); P1; |
198 | udelay(10); |
199 | for (k = 0; k < count; k++) { |
200 | w2(6); a = r1(); |
201 | w2(4); b = r1(); |
202 | buf[k] = j44(a, b); |
203 | } |
204 | w0(2); P1; w0(8); P2; |
205 | break; |
206 | case 1: |
207 | w0(1); P1; w0(1); P2; w0(2); P1; w0(0x19); P2; w0(0); P1; |
208 | udelay(10); |
209 | for (k = 0; k < count / 2; k++) { |
210 | w2(0x26); buf[2 * k] = r0(); |
211 | w2(0x24); buf[2 * k + 1] = r0(); |
212 | } |
213 | w0(2); P1; w0(9); P2; |
214 | break; |
215 | case 2: |
216 | w3(1); w3(1); w2(5); w4(1); w2(4); |
217 | w3(0); w3(0); w2(0x24); |
218 | udelay(10); |
219 | for (k = 0; k < count; k++) |
220 | buf[k] = r4(); |
221 | w2(4); |
222 | break; |
223 | case 3: |
224 | w3(1); w3(1); w2(5); w4(1); w2(4); |
225 | w3(0); w3(0); w2(0x24); |
226 | udelay(10); |
227 | for (k = 0; k < count / 2; k++) |
228 | ((u16 *)buf)[k] = r4w(); |
229 | w2(4); |
230 | break; |
231 | case 4: |
232 | w3(1); w3(1); w2(5); w4(1); w2(4); |
233 | w3(0); w3(0); w2(0x24); |
234 | udelay(10); |
235 | for (k = 0; k < count / 4; k++) |
236 | ((u32 *)buf)[k] = r4l(); |
237 | w2(4); |
238 | break; |
239 | } |
240 | } |
241 | |
242 | static void on26_write_block(struct pi_adapter *pi, char *buf, int count) |
243 | { |
244 | int k; |
245 | |
246 | switch (pi->mode) { |
247 | case 0: |
248 | case 1: |
249 | w0(1); P1; w0(1); P2; |
250 | w0(2); P1; w0(0x18 + pi->mode); P2; w0(0); P1; |
251 | udelay(10); |
252 | for (k = 0; k < count / 2; k++) { |
253 | w2(5); w0(buf[2 * k]); |
254 | w2(7); w0(buf[2 * k + 1]); |
255 | } |
256 | w2(5); w2(4); |
257 | w0(2); P1; w0(8 + pi->mode); P2; |
258 | break; |
259 | case 2: |
260 | w3(1); w3(1); w2(5); w4(1); w2(4); |
261 | w3(0); w3(0); w2(0xc5); |
262 | udelay(10); |
263 | for (k = 0; k < count; k++) |
264 | w4(buf[k]); |
265 | w2(0xc4); |
266 | break; |
267 | case 3: |
268 | w3(1); w3(1); w2(5); w4(1); w2(4); |
269 | w3(0); w3(0); w2(0xc5); |
270 | udelay(10); |
271 | for (k = 0; k < count / 2; k++) |
272 | w4w(((u16 *)buf)[k]); |
273 | w2(0xc4); |
274 | break; |
275 | case 4: |
276 | w3(1); w3(1); w2(5); w4(1); w2(4); |
277 | w3(0); w3(0); w2(0xc5); |
278 | udelay(10); |
279 | for (k = 0; k < count / 4; k++) |
280 | w4l(((u32 *)buf)[k]); |
281 | w2(0xc4); |
282 | break; |
283 | } |
284 | } |
285 | |
286 | static void on26_log_adapter(struct pi_adapter *pi) |
287 | { |
288 | char *mode_string[5] = { "4-bit" , "8-bit" , "EPP-8" , "EPP-16" , "EPP-32" }; |
289 | |
290 | dev_info(&pi->dev, |
291 | "OnSpec 90c26 at 0x%x, mode %d (%s), delay %d\n" , |
292 | pi->port, pi->mode, mode_string[pi->mode], pi->delay); |
293 | } |
294 | |
295 | static struct pi_protocol on26 = { |
296 | .owner = THIS_MODULE, |
297 | .name = "on26" , |
298 | .max_mode = 5, |
299 | .epp_first = 2, |
300 | .default_delay = 1, |
301 | .max_units = 1, |
302 | .write_regr = on26_write_regr, |
303 | .read_regr = on26_read_regr, |
304 | .write_block = on26_write_block, |
305 | .read_block = on26_read_block, |
306 | .connect = on26_connect, |
307 | .disconnect = on26_disconnect, |
308 | .test_port = on26_test_port, |
309 | .log_adapter = on26_log_adapter, |
310 | }; |
311 | |
312 | MODULE_LICENSE("GPL" ); |
313 | MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>" ); |
314 | MODULE_DESCRIPTION("Onspec 90c26 parallel port IDE adapter protocol driver" ); |
315 | module_pata_parport_driver(on26); |
316 | |