Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | paride.c (c) 1997-8 Grant R. Guenther <grant@torque.net> | |
3 | Under the terms of the GNU General Public License. | |
4 | ||
5 | This is the base module for the family of device drivers | |
6 | that support parallel port IDE devices. | |
7 | ||
8 | */ | |
9 | ||
10 | /* Changes: | |
11 | ||
12 | 1.01 GRG 1998.05.03 Use spinlocks | |
13 | 1.02 GRG 1998.05.05 init_proto, release_proto, ktti | |
14 | 1.03 GRG 1998.08.15 eliminate compiler warning | |
15 | 1.04 GRG 1998.11.28 added support for FRIQ | |
16 | 1.05 TMW 2000.06.06 use parport_find_number instead of | |
17 | parport_enumerate | |
18 | 1.06 TMW 2001.03.26 more sane parport-or-not resource management | |
19 | */ | |
20 | ||
21 | #define PI_VERSION "1.06" | |
22 | ||
23 | #include <linux/module.h> | |
1da177e4 LT |
24 | #include <linux/kmod.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/ioport.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/wait.h> | |
4e57b681 | 31 | #include <linux/sched.h> /* TASK_* */ |
1da177e4 | 32 | #include <linux/parport.h> |
1da177e4 LT |
33 | |
34 | #include "paride.h" | |
35 | ||
36 | MODULE_LICENSE("GPL"); | |
37 | ||
38 | #define MAX_PROTOS 32 | |
39 | ||
40 | static struct pi_protocol *protocols[MAX_PROTOS]; | |
41 | ||
42 | static DEFINE_SPINLOCK(pi_spinlock); | |
43 | ||
44 | void pi_write_regr(PIA * pi, int cont, int regr, int val) | |
45 | { | |
46 | pi->proto->write_regr(pi, cont, regr, val); | |
47 | } | |
48 | ||
49 | EXPORT_SYMBOL(pi_write_regr); | |
50 | ||
51 | int pi_read_regr(PIA * pi, int cont, int regr) | |
52 | { | |
53 | return pi->proto->read_regr(pi, cont, regr); | |
54 | } | |
55 | ||
56 | EXPORT_SYMBOL(pi_read_regr); | |
57 | ||
58 | void pi_write_block(PIA * pi, char *buf, int count) | |
59 | { | |
60 | pi->proto->write_block(pi, buf, count); | |
61 | } | |
62 | ||
63 | EXPORT_SYMBOL(pi_write_block); | |
64 | ||
65 | void pi_read_block(PIA * pi, char *buf, int count) | |
66 | { | |
67 | pi->proto->read_block(pi, buf, count); | |
68 | } | |
69 | ||
70 | EXPORT_SYMBOL(pi_read_block); | |
71 | ||
1da177e4 LT |
72 | static void pi_wake_up(void *p) |
73 | { | |
74 | PIA *pi = (PIA *) p; | |
75 | unsigned long flags; | |
76 | void (*cont) (void) = NULL; | |
77 | ||
78 | spin_lock_irqsave(&pi_spinlock, flags); | |
79 | ||
80 | if (pi->claim_cont && !parport_claim(pi->pardev)) { | |
81 | cont = pi->claim_cont; | |
82 | pi->claim_cont = NULL; | |
83 | pi->claimed = 1; | |
84 | } | |
85 | ||
86 | spin_unlock_irqrestore(&pi_spinlock, flags); | |
87 | ||
88 | wake_up(&(pi->parq)); | |
89 | ||
90 | if (cont) | |
91 | cont(); | |
92 | } | |
93 | ||
1da177e4 LT |
94 | int pi_schedule_claimed(PIA * pi, void (*cont) (void)) |
95 | { | |
1da177e4 LT |
96 | unsigned long flags; |
97 | ||
98 | spin_lock_irqsave(&pi_spinlock, flags); | |
99 | if (pi->pardev && parport_claim(pi->pardev)) { | |
100 | pi->claim_cont = cont; | |
101 | spin_unlock_irqrestore(&pi_spinlock, flags); | |
102 | return 0; | |
103 | } | |
104 | pi->claimed = 1; | |
105 | spin_unlock_irqrestore(&pi_spinlock, flags); | |
1da177e4 LT |
106 | return 1; |
107 | } | |
108 | EXPORT_SYMBOL(pi_schedule_claimed); | |
109 | ||
110 | void pi_do_claimed(PIA * pi, void (*cont) (void)) | |
111 | { | |
112 | if (pi_schedule_claimed(pi, cont)) | |
113 | cont(); | |
114 | } | |
115 | ||
116 | EXPORT_SYMBOL(pi_do_claimed); | |
117 | ||
118 | static void pi_claim(PIA * pi) | |
119 | { | |
120 | if (pi->claimed) | |
121 | return; | |
122 | pi->claimed = 1; | |
1da177e4 LT |
123 | if (pi->pardev) |
124 | wait_event(pi->parq, | |
125 | !parport_claim((struct pardevice *) pi->pardev)); | |
1da177e4 LT |
126 | } |
127 | ||
128 | static void pi_unclaim(PIA * pi) | |
129 | { | |
130 | pi->claimed = 0; | |
1da177e4 LT |
131 | if (pi->pardev) |
132 | parport_release((struct pardevice *) (pi->pardev)); | |
1da177e4 LT |
133 | } |
134 | ||
135 | void pi_connect(PIA * pi) | |
136 | { | |
137 | pi_claim(pi); | |
138 | pi->proto->connect(pi); | |
139 | } | |
140 | ||
141 | EXPORT_SYMBOL(pi_connect); | |
142 | ||
143 | void pi_disconnect(PIA * pi) | |
144 | { | |
145 | pi->proto->disconnect(pi); | |
146 | pi_unclaim(pi); | |
147 | } | |
148 | ||
149 | EXPORT_SYMBOL(pi_disconnect); | |
150 | ||
151 | static void pi_unregister_parport(PIA * pi) | |
152 | { | |
1da177e4 LT |
153 | if (pi->pardev) { |
154 | parport_unregister_device((struct pardevice *) (pi->pardev)); | |
155 | pi->pardev = NULL; | |
156 | } | |
1da177e4 LT |
157 | } |
158 | ||
159 | void pi_release(PIA * pi) | |
160 | { | |
161 | pi_unregister_parport(pi); | |
1da177e4 LT |
162 | if (pi->proto->release_proto) |
163 | pi->proto->release_proto(pi); | |
164 | module_put(pi->proto->owner); | |
165 | } | |
166 | ||
167 | EXPORT_SYMBOL(pi_release); | |
168 | ||
169 | static int default_test_proto(PIA * pi, char *scratch, int verbose) | |
170 | { | |
171 | int j, k; | |
172 | int e[2] = { 0, 0 }; | |
173 | ||
174 | pi->proto->connect(pi); | |
175 | ||
176 | for (j = 0; j < 2; j++) { | |
177 | pi_write_regr(pi, 0, 6, 0xa0 + j * 0x10); | |
178 | for (k = 0; k < 256; k++) { | |
179 | pi_write_regr(pi, 0, 2, k ^ 0xaa); | |
180 | pi_write_regr(pi, 0, 3, k ^ 0x55); | |
181 | if (pi_read_regr(pi, 0, 2) != (k ^ 0xaa)) | |
182 | e[j]++; | |
183 | } | |
184 | } | |
185 | pi->proto->disconnect(pi); | |
186 | ||
187 | if (verbose) | |
188 | printk("%s: %s: port 0x%x, mode %d, test=(%d,%d)\n", | |
189 | pi->device, pi->proto->name, pi->port, | |
190 | pi->mode, e[0], e[1]); | |
191 | ||
192 | return (e[0] && e[1]); /* not here if both > 0 */ | |
193 | } | |
194 | ||
195 | static int pi_test_proto(PIA * pi, char *scratch, int verbose) | |
196 | { | |
197 | int res; | |
198 | ||
199 | pi_claim(pi); | |
200 | if (pi->proto->test_proto) | |
201 | res = pi->proto->test_proto(pi, scratch, verbose); | |
202 | else | |
203 | res = default_test_proto(pi, scratch, verbose); | |
204 | pi_unclaim(pi); | |
205 | ||
206 | return res; | |
207 | } | |
208 | ||
f4330002 | 209 | int paride_register(PIP * pr) |
1da177e4 LT |
210 | { |
211 | int k; | |
212 | ||
213 | for (k = 0; k < MAX_PROTOS; k++) | |
214 | if (protocols[k] && !strcmp(pr->name, protocols[k]->name)) { | |
215 | printk("paride: %s protocol already registered\n", | |
216 | pr->name); | |
b4178ab5 | 217 | return -1; |
1da177e4 LT |
218 | } |
219 | k = 0; | |
220 | while ((k < MAX_PROTOS) && (protocols[k])) | |
221 | k++; | |
222 | if (k == MAX_PROTOS) { | |
223 | printk("paride: protocol table full\n"); | |
b4178ab5 | 224 | return -1; |
1da177e4 LT |
225 | } |
226 | protocols[k] = pr; | |
227 | pr->index = k; | |
228 | printk("paride: %s registered as protocol %d\n", pr->name, k); | |
b4178ab5 | 229 | return 0; |
1da177e4 LT |
230 | } |
231 | ||
f4330002 | 232 | EXPORT_SYMBOL(paride_register); |
1da177e4 | 233 | |
f4330002 | 234 | void paride_unregister(PIP * pr) |
1da177e4 LT |
235 | { |
236 | if (!pr) | |
237 | return; | |
238 | if (protocols[pr->index] != pr) { | |
239 | printk("paride: %s not registered\n", pr->name); | |
240 | return; | |
241 | } | |
242 | protocols[pr->index] = NULL; | |
243 | } | |
244 | ||
f4330002 | 245 | EXPORT_SYMBOL(paride_unregister); |
1da177e4 LT |
246 | |
247 | static int pi_register_parport(PIA * pi, int verbose) | |
248 | { | |
1da177e4 LT |
249 | struct parport *port; |
250 | ||
251 | port = parport_find_base(pi->port); | |
252 | if (!port) | |
253 | return 0; | |
254 | ||
255 | pi->pardev = parport_register_device(port, | |
256 | pi->device, NULL, | |
257 | pi_wake_up, NULL, 0, (void *) pi); | |
258 | parport_put_port(port); | |
259 | if (!pi->pardev) | |
260 | return 0; | |
261 | ||
262 | init_waitqueue_head(&pi->parq); | |
263 | ||
264 | if (verbose) | |
265 | printk("%s: 0x%x is %s\n", pi->device, pi->port, port->name); | |
266 | ||
267 | pi->parname = (char *) port->name; | |
1da177e4 LT |
268 | |
269 | return 1; | |
270 | } | |
271 | ||
272 | static int pi_probe_mode(PIA * pi, int max, char *scratch, int verbose) | |
273 | { | |
274 | int best, range; | |
275 | ||
276 | if (pi->mode != -1) { | |
277 | if (pi->mode >= max) | |
278 | return 0; | |
279 | range = 3; | |
280 | if (pi->mode >= pi->proto->epp_first) | |
281 | range = 8; | |
282 | if ((range == 8) && (pi->port % 8)) | |
283 | return 0; | |
284 | pi->reserved = range; | |
285 | return (!pi_test_proto(pi, scratch, verbose)); | |
286 | } | |
287 | best = -1; | |
288 | for (pi->mode = 0; pi->mode < max; pi->mode++) { | |
289 | range = 3; | |
290 | if (pi->mode >= pi->proto->epp_first) | |
291 | range = 8; | |
292 | if ((range == 8) && (pi->port % 8)) | |
293 | break; | |
294 | pi->reserved = range; | |
295 | if (!pi_test_proto(pi, scratch, verbose)) | |
296 | best = pi->mode; | |
297 | } | |
298 | pi->mode = best; | |
299 | return (best > -1); | |
300 | } | |
301 | ||
302 | static int pi_probe_unit(PIA * pi, int unit, char *scratch, int verbose) | |
303 | { | |
304 | int max, s, e; | |
305 | ||
306 | s = unit; | |
307 | e = s + 1; | |
308 | ||
309 | if (s == -1) { | |
310 | s = 0; | |
311 | e = pi->proto->max_units; | |
312 | } | |
313 | ||
314 | if (!pi_register_parport(pi, verbose)) | |
315 | return 0; | |
316 | ||
317 | if (pi->proto->test_port) { | |
318 | pi_claim(pi); | |
319 | max = pi->proto->test_port(pi); | |
320 | pi_unclaim(pi); | |
321 | } else | |
322 | max = pi->proto->max_mode; | |
323 | ||
324 | if (pi->proto->probe_unit) { | |
325 | pi_claim(pi); | |
326 | for (pi->unit = s; pi->unit < e; pi->unit++) | |
327 | if (pi->proto->probe_unit(pi)) { | |
328 | pi_unclaim(pi); | |
329 | if (pi_probe_mode(pi, max, scratch, verbose)) | |
330 | return 1; | |
331 | pi_unregister_parport(pi); | |
332 | return 0; | |
333 | } | |
334 | pi_unclaim(pi); | |
335 | pi_unregister_parport(pi); | |
336 | return 0; | |
337 | } | |
338 | ||
339 | if (!pi_probe_mode(pi, max, scratch, verbose)) { | |
340 | pi_unregister_parport(pi); | |
341 | return 0; | |
342 | } | |
343 | return 1; | |
344 | ||
345 | } | |
346 | ||
347 | int pi_init(PIA * pi, int autoprobe, int port, int mode, | |
348 | int unit, int protocol, int delay, char *scratch, | |
349 | int devtype, int verbose, char *device) | |
350 | { | |
351 | int p, k, s, e; | |
352 | int lpts[7] = { 0x3bc, 0x378, 0x278, 0x268, 0x27c, 0x26c, 0 }; | |
353 | ||
354 | s = protocol; | |
355 | e = s + 1; | |
356 | ||
357 | if (!protocols[0]) | |
358 | request_module("paride_protocol"); | |
359 | ||
360 | if (autoprobe) { | |
361 | s = 0; | |
362 | e = MAX_PROTOS; | |
363 | } else if ((s < 0) || (s >= MAX_PROTOS) || (port <= 0) || | |
364 | (!protocols[s]) || (unit < 0) || | |
365 | (unit >= protocols[s]->max_units)) { | |
366 | printk("%s: Invalid parameters\n", device); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | for (p = s; p < e; p++) { | |
371 | struct pi_protocol *proto = protocols[p]; | |
372 | if (!proto) | |
373 | continue; | |
374 | /* still racy */ | |
375 | if (!try_module_get(proto->owner)) | |
376 | continue; | |
377 | pi->proto = proto; | |
378 | pi->private = 0; | |
379 | if (proto->init_proto && proto->init_proto(pi) < 0) { | |
380 | pi->proto = NULL; | |
381 | module_put(proto->owner); | |
382 | continue; | |
383 | } | |
384 | if (delay == -1) | |
385 | pi->delay = pi->proto->default_delay; | |
386 | else | |
387 | pi->delay = delay; | |
388 | pi->devtype = devtype; | |
389 | pi->device = device; | |
390 | ||
391 | pi->parname = NULL; | |
392 | pi->pardev = NULL; | |
393 | init_waitqueue_head(&pi->parq); | |
394 | pi->claimed = 0; | |
395 | pi->claim_cont = NULL; | |
396 | ||
397 | pi->mode = mode; | |
398 | if (port != -1) { | |
399 | pi->port = port; | |
400 | if (pi_probe_unit(pi, unit, scratch, verbose)) | |
401 | break; | |
402 | pi->port = 0; | |
403 | } else { | |
404 | k = 0; | |
405 | while ((pi->port = lpts[k++])) | |
406 | if (pi_probe_unit | |
407 | (pi, unit, scratch, verbose)) | |
408 | break; | |
409 | if (pi->port) | |
410 | break; | |
411 | } | |
412 | if (pi->proto->release_proto) | |
413 | pi->proto->release_proto(pi); | |
414 | module_put(proto->owner); | |
415 | } | |
416 | ||
417 | if (!pi->port) { | |
418 | if (autoprobe) | |
419 | printk("%s: Autoprobe failed\n", device); | |
420 | else | |
421 | printk("%s: Adapter not found\n", device); | |
422 | return 0; | |
423 | } | |
1da177e4 LT |
424 | |
425 | if (pi->parname) | |
426 | printk("%s: Sharing %s at 0x%x\n", pi->device, | |
427 | pi->parname, pi->port); | |
428 | ||
429 | pi->proto->log_adapter(pi, scratch, verbose); | |
430 | ||
431 | return 1; | |
432 | } | |
433 | ||
434 | EXPORT_SYMBOL(pi_init); |