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Commit | Line | Data |
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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> |
9f4ba6b0 | 33 | #include <linux/slab.h> |
1da177e4 LT |
34 | |
35 | #include "paride.h" | |
36 | ||
37 | MODULE_LICENSE("GPL"); | |
38 | ||
39 | #define MAX_PROTOS 32 | |
40 | ||
41 | static struct pi_protocol *protocols[MAX_PROTOS]; | |
42 | ||
43 | static DEFINE_SPINLOCK(pi_spinlock); | |
44 | ||
45 | void pi_write_regr(PIA * pi, int cont, int regr, int val) | |
46 | { | |
47 | pi->proto->write_regr(pi, cont, regr, val); | |
48 | } | |
49 | ||
50 | EXPORT_SYMBOL(pi_write_regr); | |
51 | ||
52 | int pi_read_regr(PIA * pi, int cont, int regr) | |
53 | { | |
54 | return pi->proto->read_regr(pi, cont, regr); | |
55 | } | |
56 | ||
57 | EXPORT_SYMBOL(pi_read_regr); | |
58 | ||
59 | void pi_write_block(PIA * pi, char *buf, int count) | |
60 | { | |
61 | pi->proto->write_block(pi, buf, count); | |
62 | } | |
63 | ||
64 | EXPORT_SYMBOL(pi_write_block); | |
65 | ||
66 | void pi_read_block(PIA * pi, char *buf, int count) | |
67 | { | |
68 | pi->proto->read_block(pi, buf, count); | |
69 | } | |
70 | ||
71 | EXPORT_SYMBOL(pi_read_block); | |
72 | ||
1da177e4 LT |
73 | static void pi_wake_up(void *p) |
74 | { | |
75 | PIA *pi = (PIA *) p; | |
76 | unsigned long flags; | |
77 | void (*cont) (void) = NULL; | |
78 | ||
79 | spin_lock_irqsave(&pi_spinlock, flags); | |
80 | ||
81 | if (pi->claim_cont && !parport_claim(pi->pardev)) { | |
82 | cont = pi->claim_cont; | |
83 | pi->claim_cont = NULL; | |
84 | pi->claimed = 1; | |
85 | } | |
86 | ||
87 | spin_unlock_irqrestore(&pi_spinlock, flags); | |
88 | ||
89 | wake_up(&(pi->parq)); | |
90 | ||
91 | if (cont) | |
92 | cont(); | |
93 | } | |
94 | ||
1da177e4 LT |
95 | int pi_schedule_claimed(PIA * pi, void (*cont) (void)) |
96 | { | |
1da177e4 LT |
97 | unsigned long flags; |
98 | ||
99 | spin_lock_irqsave(&pi_spinlock, flags); | |
100 | if (pi->pardev && parport_claim(pi->pardev)) { | |
101 | pi->claim_cont = cont; | |
102 | spin_unlock_irqrestore(&pi_spinlock, flags); | |
103 | return 0; | |
104 | } | |
105 | pi->claimed = 1; | |
106 | spin_unlock_irqrestore(&pi_spinlock, flags); | |
1da177e4 LT |
107 | return 1; |
108 | } | |
109 | EXPORT_SYMBOL(pi_schedule_claimed); | |
110 | ||
111 | void pi_do_claimed(PIA * pi, void (*cont) (void)) | |
112 | { | |
113 | if (pi_schedule_claimed(pi, cont)) | |
114 | cont(); | |
115 | } | |
116 | ||
117 | EXPORT_SYMBOL(pi_do_claimed); | |
118 | ||
119 | static void pi_claim(PIA * pi) | |
120 | { | |
121 | if (pi->claimed) | |
122 | return; | |
123 | pi->claimed = 1; | |
1da177e4 LT |
124 | if (pi->pardev) |
125 | wait_event(pi->parq, | |
126 | !parport_claim((struct pardevice *) pi->pardev)); | |
1da177e4 LT |
127 | } |
128 | ||
129 | static void pi_unclaim(PIA * pi) | |
130 | { | |
131 | pi->claimed = 0; | |
1da177e4 LT |
132 | if (pi->pardev) |
133 | parport_release((struct pardevice *) (pi->pardev)); | |
1da177e4 LT |
134 | } |
135 | ||
136 | void pi_connect(PIA * pi) | |
137 | { | |
138 | pi_claim(pi); | |
139 | pi->proto->connect(pi); | |
140 | } | |
141 | ||
142 | EXPORT_SYMBOL(pi_connect); | |
143 | ||
144 | void pi_disconnect(PIA * pi) | |
145 | { | |
146 | pi->proto->disconnect(pi); | |
147 | pi_unclaim(pi); | |
148 | } | |
149 | ||
150 | EXPORT_SYMBOL(pi_disconnect); | |
151 | ||
152 | static void pi_unregister_parport(PIA * pi) | |
153 | { | |
1da177e4 LT |
154 | if (pi->pardev) { |
155 | parport_unregister_device((struct pardevice *) (pi->pardev)); | |
156 | pi->pardev = NULL; | |
157 | } | |
1da177e4 LT |
158 | } |
159 | ||
160 | void pi_release(PIA * pi) | |
161 | { | |
162 | pi_unregister_parport(pi); | |
1da177e4 LT |
163 | if (pi->proto->release_proto) |
164 | pi->proto->release_proto(pi); | |
165 | module_put(pi->proto->owner); | |
166 | } | |
167 | ||
168 | EXPORT_SYMBOL(pi_release); | |
169 | ||
170 | static int default_test_proto(PIA * pi, char *scratch, int verbose) | |
171 | { | |
172 | int j, k; | |
173 | int e[2] = { 0, 0 }; | |
174 | ||
175 | pi->proto->connect(pi); | |
176 | ||
177 | for (j = 0; j < 2; j++) { | |
178 | pi_write_regr(pi, 0, 6, 0xa0 + j * 0x10); | |
179 | for (k = 0; k < 256; k++) { | |
180 | pi_write_regr(pi, 0, 2, k ^ 0xaa); | |
181 | pi_write_regr(pi, 0, 3, k ^ 0x55); | |
182 | if (pi_read_regr(pi, 0, 2) != (k ^ 0xaa)) | |
183 | e[j]++; | |
184 | } | |
185 | } | |
186 | pi->proto->disconnect(pi); | |
187 | ||
188 | if (verbose) | |
189 | printk("%s: %s: port 0x%x, mode %d, test=(%d,%d)\n", | |
190 | pi->device, pi->proto->name, pi->port, | |
191 | pi->mode, e[0], e[1]); | |
192 | ||
193 | return (e[0] && e[1]); /* not here if both > 0 */ | |
194 | } | |
195 | ||
196 | static int pi_test_proto(PIA * pi, char *scratch, int verbose) | |
197 | { | |
198 | int res; | |
199 | ||
200 | pi_claim(pi); | |
201 | if (pi->proto->test_proto) | |
202 | res = pi->proto->test_proto(pi, scratch, verbose); | |
203 | else | |
204 | res = default_test_proto(pi, scratch, verbose); | |
205 | pi_unclaim(pi); | |
206 | ||
207 | return res; | |
208 | } | |
209 | ||
f4330002 | 210 | int paride_register(PIP * pr) |
1da177e4 LT |
211 | { |
212 | int k; | |
213 | ||
214 | for (k = 0; k < MAX_PROTOS; k++) | |
215 | if (protocols[k] && !strcmp(pr->name, protocols[k]->name)) { | |
216 | printk("paride: %s protocol already registered\n", | |
217 | pr->name); | |
b4178ab5 | 218 | return -1; |
1da177e4 LT |
219 | } |
220 | k = 0; | |
221 | while ((k < MAX_PROTOS) && (protocols[k])) | |
222 | k++; | |
223 | if (k == MAX_PROTOS) { | |
224 | printk("paride: protocol table full\n"); | |
b4178ab5 | 225 | return -1; |
1da177e4 LT |
226 | } |
227 | protocols[k] = pr; | |
228 | pr->index = k; | |
229 | printk("paride: %s registered as protocol %d\n", pr->name, k); | |
b4178ab5 | 230 | return 0; |
1da177e4 LT |
231 | } |
232 | ||
f4330002 | 233 | EXPORT_SYMBOL(paride_register); |
1da177e4 | 234 | |
f4330002 | 235 | void paride_unregister(PIP * pr) |
1da177e4 LT |
236 | { |
237 | if (!pr) | |
238 | return; | |
239 | if (protocols[pr->index] != pr) { | |
240 | printk("paride: %s not registered\n", pr->name); | |
241 | return; | |
242 | } | |
243 | protocols[pr->index] = NULL; | |
244 | } | |
245 | ||
f4330002 | 246 | EXPORT_SYMBOL(paride_unregister); |
1da177e4 | 247 | |
9f4ba6b0 | 248 | static int pi_register_parport(PIA *pi, int verbose, int unit) |
1da177e4 | 249 | { |
1da177e4 | 250 | struct parport *port; |
9f4ba6b0 | 251 | struct pardev_cb par_cb; |
1da177e4 LT |
252 | |
253 | port = parport_find_base(pi->port); | |
254 | if (!port) | |
255 | return 0; | |
9f4ba6b0 SM |
256 | memset(&par_cb, 0, sizeof(par_cb)); |
257 | par_cb.wakeup = pi_wake_up; | |
258 | par_cb.private = (void *)pi; | |
259 | pi->pardev = parport_register_dev_model(port, pi->device, &par_cb, | |
260 | unit); | |
1da177e4 LT |
261 | parport_put_port(port); |
262 | if (!pi->pardev) | |
263 | return 0; | |
264 | ||
265 | init_waitqueue_head(&pi->parq); | |
266 | ||
267 | if (verbose) | |
268 | printk("%s: 0x%x is %s\n", pi->device, pi->port, port->name); | |
269 | ||
270 | pi->parname = (char *) port->name; | |
1da177e4 LT |
271 | |
272 | return 1; | |
273 | } | |
274 | ||
275 | static int pi_probe_mode(PIA * pi, int max, char *scratch, int verbose) | |
276 | { | |
277 | int best, range; | |
278 | ||
279 | if (pi->mode != -1) { | |
280 | if (pi->mode >= max) | |
281 | return 0; | |
282 | range = 3; | |
283 | if (pi->mode >= pi->proto->epp_first) | |
284 | range = 8; | |
285 | if ((range == 8) && (pi->port % 8)) | |
286 | return 0; | |
287 | pi->reserved = range; | |
288 | return (!pi_test_proto(pi, scratch, verbose)); | |
289 | } | |
290 | best = -1; | |
291 | for (pi->mode = 0; pi->mode < max; pi->mode++) { | |
292 | range = 3; | |
293 | if (pi->mode >= pi->proto->epp_first) | |
294 | range = 8; | |
295 | if ((range == 8) && (pi->port % 8)) | |
296 | break; | |
297 | pi->reserved = range; | |
298 | if (!pi_test_proto(pi, scratch, verbose)) | |
299 | best = pi->mode; | |
300 | } | |
301 | pi->mode = best; | |
302 | return (best > -1); | |
303 | } | |
304 | ||
305 | static int pi_probe_unit(PIA * pi, int unit, char *scratch, int verbose) | |
306 | { | |
307 | int max, s, e; | |
308 | ||
309 | s = unit; | |
310 | e = s + 1; | |
311 | ||
312 | if (s == -1) { | |
313 | s = 0; | |
314 | e = pi->proto->max_units; | |
315 | } | |
316 | ||
9f4ba6b0 | 317 | if (!pi_register_parport(pi, verbose, s)) |
1da177e4 LT |
318 | return 0; |
319 | ||
320 | if (pi->proto->test_port) { | |
321 | pi_claim(pi); | |
322 | max = pi->proto->test_port(pi); | |
323 | pi_unclaim(pi); | |
324 | } else | |
325 | max = pi->proto->max_mode; | |
326 | ||
327 | if (pi->proto->probe_unit) { | |
328 | pi_claim(pi); | |
329 | for (pi->unit = s; pi->unit < e; pi->unit++) | |
330 | if (pi->proto->probe_unit(pi)) { | |
331 | pi_unclaim(pi); | |
332 | if (pi_probe_mode(pi, max, scratch, verbose)) | |
333 | return 1; | |
334 | pi_unregister_parport(pi); | |
335 | return 0; | |
336 | } | |
337 | pi_unclaim(pi); | |
338 | pi_unregister_parport(pi); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | if (!pi_probe_mode(pi, max, scratch, verbose)) { | |
343 | pi_unregister_parport(pi); | |
344 | return 0; | |
345 | } | |
346 | return 1; | |
347 | ||
348 | } | |
349 | ||
350 | int pi_init(PIA * pi, int autoprobe, int port, int mode, | |
351 | int unit, int protocol, int delay, char *scratch, | |
352 | int devtype, int verbose, char *device) | |
353 | { | |
354 | int p, k, s, e; | |
355 | int lpts[7] = { 0x3bc, 0x378, 0x278, 0x268, 0x27c, 0x26c, 0 }; | |
356 | ||
357 | s = protocol; | |
358 | e = s + 1; | |
359 | ||
360 | if (!protocols[0]) | |
361 | request_module("paride_protocol"); | |
362 | ||
363 | if (autoprobe) { | |
364 | s = 0; | |
365 | e = MAX_PROTOS; | |
366 | } else if ((s < 0) || (s >= MAX_PROTOS) || (port <= 0) || | |
367 | (!protocols[s]) || (unit < 0) || | |
368 | (unit >= protocols[s]->max_units)) { | |
369 | printk("%s: Invalid parameters\n", device); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | for (p = s; p < e; p++) { | |
374 | struct pi_protocol *proto = protocols[p]; | |
375 | if (!proto) | |
376 | continue; | |
377 | /* still racy */ | |
378 | if (!try_module_get(proto->owner)) | |
379 | continue; | |
380 | pi->proto = proto; | |
381 | pi->private = 0; | |
382 | if (proto->init_proto && proto->init_proto(pi) < 0) { | |
383 | pi->proto = NULL; | |
384 | module_put(proto->owner); | |
385 | continue; | |
386 | } | |
387 | if (delay == -1) | |
388 | pi->delay = pi->proto->default_delay; | |
389 | else | |
390 | pi->delay = delay; | |
391 | pi->devtype = devtype; | |
392 | pi->device = device; | |
393 | ||
394 | pi->parname = NULL; | |
395 | pi->pardev = NULL; | |
396 | init_waitqueue_head(&pi->parq); | |
397 | pi->claimed = 0; | |
398 | pi->claim_cont = NULL; | |
399 | ||
400 | pi->mode = mode; | |
401 | if (port != -1) { | |
402 | pi->port = port; | |
403 | if (pi_probe_unit(pi, unit, scratch, verbose)) | |
404 | break; | |
405 | pi->port = 0; | |
406 | } else { | |
407 | k = 0; | |
408 | while ((pi->port = lpts[k++])) | |
409 | if (pi_probe_unit | |
410 | (pi, unit, scratch, verbose)) | |
411 | break; | |
412 | if (pi->port) | |
413 | break; | |
414 | } | |
415 | if (pi->proto->release_proto) | |
416 | pi->proto->release_proto(pi); | |
417 | module_put(proto->owner); | |
418 | } | |
419 | ||
420 | if (!pi->port) { | |
421 | if (autoprobe) | |
422 | printk("%s: Autoprobe failed\n", device); | |
423 | else | |
424 | printk("%s: Adapter not found\n", device); | |
425 | return 0; | |
426 | } | |
1da177e4 LT |
427 | |
428 | if (pi->parname) | |
429 | printk("%s: Sharing %s at 0x%x\n", pi->device, | |
430 | pi->parname, pi->port); | |
431 | ||
432 | pi->proto->log_adapter(pi, scratch, verbose); | |
433 | ||
434 | return 1; | |
435 | } | |
436 | ||
437 | EXPORT_SYMBOL(pi_init); | |
9f4ba6b0 SM |
438 | |
439 | static int pi_probe(struct pardevice *par_dev) | |
440 | { | |
441 | struct device_driver *drv = par_dev->dev.driver; | |
442 | int len = strlen(drv->name); | |
443 | ||
444 | if (strncmp(par_dev->name, drv->name, len)) | |
445 | return -ENODEV; | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | void *pi_register_driver(char *name) | |
451 | { | |
452 | struct parport_driver *parp_drv; | |
453 | int ret; | |
454 | ||
455 | parp_drv = kzalloc(sizeof(*parp_drv), GFP_KERNEL); | |
456 | if (!parp_drv) | |
457 | return NULL; | |
458 | ||
459 | parp_drv->name = name; | |
460 | parp_drv->probe = pi_probe; | |
461 | parp_drv->devmodel = true; | |
462 | ||
463 | ret = parport_register_driver(parp_drv); | |
464 | if (ret) { | |
465 | kfree(parp_drv); | |
466 | return NULL; | |
467 | } | |
468 | return (void *)parp_drv; | |
469 | } | |
470 | EXPORT_SYMBOL(pi_register_driver); | |
471 | ||
472 | void pi_unregister_driver(void *_drv) | |
473 | { | |
474 | struct parport_driver *drv = _drv; | |
475 | ||
476 | parport_unregister_driver(drv); | |
477 | kfree(drv); | |
478 | } | |
479 | EXPORT_SYMBOL(pi_unregister_driver); |