FreeBSD/Linux Kernel Cross Reference
sys/dev/ppbus/ppi.c
1 /*-
2 * Copyright (c) 1997, 1998, 1999 Nicolas Souchu, Michael Smith
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/5.4/sys/dev/ppbus/ppi.c 131882 2004-07-09 16:56:46Z cognet $");
31 #include "opt_ppb_1284.h"
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/module.h>
36 #include <sys/bus.h>
37 #include <sys/conf.h>
38 #include <sys/kernel.h>
39 #include <sys/uio.h>
40 #include <sys/fcntl.h>
41
42 #include <machine/bus.h>
43 #include <machine/resource.h>
44 #include <sys/rman.h>
45
46 #include <dev/ppbus/ppbconf.h>
47 #include <dev/ppbus/ppb_msq.h>
48
49 #ifdef PERIPH_1284
50 #include <dev/ppbus/ppb_1284.h>
51 #endif
52
53 #include <dev/ppbus/ppi.h>
54
55 #include "ppbus_if.h"
56
57 #include <dev/ppbus/ppbio.h>
58
59 #define BUFSIZE 512
60
61 struct ppi_data {
62
63 int ppi_unit;
64 int ppi_flags;
65 #define HAVE_PPBUS (1<<0)
66 #define HAD_PPBUS (1<<1)
67
68 int ppi_count;
69 int ppi_mode; /* IEEE1284 mode */
70 char ppi_buffer[BUFSIZE];
71
72 #ifdef PERIPH_1284
73 struct resource *intr_resource; /* interrupt resource */
74 void *intr_cookie; /* interrupt registration cookie */
75 #endif /* PERIPH_1284 */
76 };
77
78 #define DEVTOSOFTC(dev) \
79 ((struct ppi_data *)device_get_softc(dev))
80 #define UNITOSOFTC(unit) \
81 ((struct ppi_data *)devclass_get_softc(ppi_devclass, (unit)))
82 #define UNITODEVICE(unit) \
83 (devclass_get_device(ppi_devclass, (unit)))
84
85 static devclass_t ppi_devclass;
86
87 static d_open_t ppiopen;
88 static d_close_t ppiclose;
89 static d_ioctl_t ppiioctl;
90 static d_write_t ppiwrite;
91 static d_read_t ppiread;
92
93 static struct cdevsw ppi_cdevsw = {
94 .d_version = D_VERSION,
95 .d_flags = D_NEEDGIANT,
96 .d_open = ppiopen,
97 .d_close = ppiclose,
98 .d_read = ppiread,
99 .d_write = ppiwrite,
100 .d_ioctl = ppiioctl,
101 .d_name = "ppi",
102 };
103
104 #ifdef PERIPH_1284
105
106 static void
107 ppi_enable_intr(device_t ppidev)
108 {
109 char r;
110 device_t ppbus = device_get_parent(ppidev);
111
112 r = ppb_rctr(ppbus);
113 ppb_wctr(ppbus, r | IRQENABLE);
114
115 return;
116 }
117
118 static void
119 ppi_disable_intr(device_t ppidev)
120 {
121 char r;
122 device_t ppbus = device_get_parent(ppidev);
123
124 r = ppb_rctr(ppbus);
125 ppb_wctr(ppbus, r & ~IRQENABLE);
126
127 return;
128 }
129
130 #endif /* PERIPH_1284 */
131
132 static void
133 ppi_identify(driver_t *driver, device_t parent)
134 {
135
136 device_t dev;
137
138 dev = device_find_child(parent, "ppi", 0);
139 if (!dev)
140 BUS_ADD_CHILD(parent, 0, "ppi", -1);
141 }
142
143 /*
144 * ppi_probe()
145 */
146 static int
147 ppi_probe(device_t dev)
148 {
149 struct ppi_data *ppi;
150
151 /* probe is always ok */
152 device_set_desc(dev, "Parallel I/O");
153
154 ppi = DEVTOSOFTC(dev);
155
156 return (0);
157 }
158
159 /*
160 * ppi_attach()
161 */
162 static int
163 ppi_attach(device_t dev)
164 {
165 #ifdef PERIPH_1284
166 uintptr_t irq;
167 int zero = 0;
168 struct ppi_data *ppi = DEVTOSOFTC(dev);
169
170 /* retrive the irq */
171 BUS_READ_IVAR(device_get_parent(dev), dev, PPBUS_IVAR_IRQ, &irq);
172
173 /* declare our interrupt handler */
174 ppi->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
175 &zero, irq, irq, 1, RF_ACTIVE);
176 #endif /* PERIPH_1284 */
177
178 make_dev(&ppi_cdevsw, device_get_unit(dev), /* XXX cleanup */
179 UID_ROOT, GID_WHEEL,
180 0600, "ppi%d", device_get_unit(dev));
181
182 return (0);
183 }
184
185 #ifdef PERIPH_1284
186 /*
187 * Cable
188 * -----
189 *
190 * Use an IEEE1284 compliant (DB25/DB25) cable with the following tricks:
191 *
192 * nStrobe <-> nAck 1 <-> 10
193 * nAutofd <-> Busy 11 <-> 14
194 * nSelectin <-> Select 17 <-> 13
195 * nInit <-> nFault 15 <-> 16
196 *
197 */
198 static void
199 ppiintr(void *arg)
200 {
201 device_t ppidev = (device_t)arg;
202 device_t ppbus = device_get_parent(ppidev);
203 struct ppi_data *ppi = DEVTOSOFTC(ppidev);
204
205 ppi_disable_intr(ppidev);
206
207 switch (ppb_1284_get_state(ppbus)) {
208
209 /* accept IEEE1284 negotiation then wakeup a waiting process to
210 * continue negotiation at process level */
211 case PPB_FORWARD_IDLE:
212 /* Event 1 */
213 if ((ppb_rstr(ppbus) & (SELECT | nBUSY)) ==
214 (SELECT | nBUSY)) {
215 /* IEEE1284 negotiation */
216 #ifdef DEBUG_1284
217 printf("N");
218 #endif
219
220 /* Event 2 - prepare for reading the ext. value */
221 ppb_wctr(ppbus, (PCD | STROBE | nINIT) & ~SELECTIN);
222
223 ppb_1284_set_state(ppbus, PPB_NEGOCIATION);
224
225 } else {
226 #ifdef DEBUG_1284
227 printf("0x%x", ppb_rstr(ppbus));
228 #endif
229 ppb_peripheral_terminate(ppbus, PPB_DONTWAIT);
230 break;
231 }
232
233 /* wake up any process waiting for negotiation from
234 * remote master host */
235
236 /* XXX should set a variable to warn the process about
237 * the interrupt */
238
239 wakeup(ppi);
240 break;
241 default:
242 #ifdef DEBUG_1284
243 printf("?%d", ppb_1284_get_state(ppbus));
244 #endif
245 ppb_1284_set_state(ppbus, PPB_FORWARD_IDLE);
246 ppb_set_mode(ppbus, PPB_COMPATIBLE);
247 break;
248 }
249
250 ppi_enable_intr(ppidev);
251
252 return;
253 }
254 #endif /* PERIPH_1284 */
255
256 static int
257 ppiopen(struct cdev *dev, int flags, int fmt, struct thread *td)
258 {
259 u_int unit = minor(dev);
260 struct ppi_data *ppi = UNITOSOFTC(unit);
261 device_t ppidev = UNITODEVICE(unit);
262 device_t ppbus = device_get_parent(ppidev);
263 int res;
264
265 if (!ppi)
266 return (ENXIO);
267
268 if (!(ppi->ppi_flags & HAVE_PPBUS)) {
269 if ((res = ppb_request_bus(ppbus, ppidev,
270 (flags & O_NONBLOCK) ? PPB_DONTWAIT :
271 (PPB_WAIT | PPB_INTR))))
272 return (res);
273
274 ppi->ppi_flags |= HAVE_PPBUS;
275
276 #ifdef PERIPH_1284
277 if (ppi->intr_resource) {
278 /* register our interrupt handler */
279 BUS_SETUP_INTR(device_get_parent(ppidev), ppidev, ppi->intr_resource,
280 INTR_TYPE_TTY, ppiintr, dev, &ppi->intr_cookie);
281 }
282 #endif /* PERIPH_1284 */
283 }
284 ppi->ppi_count += 1;
285
286 return (0);
287 }
288
289 static int
290 ppiclose(struct cdev *dev, int flags, int fmt, struct thread *td)
291 {
292 u_int unit = minor(dev);
293 struct ppi_data *ppi = UNITOSOFTC(unit);
294 device_t ppidev = UNITODEVICE(unit);
295 device_t ppbus = device_get_parent(ppidev);
296
297 ppi->ppi_count --;
298 if (!ppi->ppi_count) {
299
300 #ifdef PERIPH_1284
301 switch (ppb_1284_get_state(ppbus)) {
302 case PPB_PERIPHERAL_IDLE:
303 ppb_peripheral_terminate(ppbus, 0);
304 break;
305 case PPB_REVERSE_IDLE:
306 case PPB_EPP_IDLE:
307 case PPB_ECP_FORWARD_IDLE:
308 default:
309 ppb_1284_terminate(ppbus);
310 break;
311 }
312 #endif /* PERIPH_1284 */
313
314 /* unregistration of interrupt forced by release */
315 ppb_release_bus(ppbus, ppidev);
316
317 ppi->ppi_flags &= ~HAVE_PPBUS;
318 }
319
320 return (0);
321 }
322
323 /*
324 * ppiread()
325 *
326 * IEEE1284 compliant read.
327 *
328 * First, try negotiation to BYTE then NIBBLE mode
329 * If no data is available, wait for it otherwise transfer as much as possible
330 */
331 static int
332 ppiread(struct cdev *dev, struct uio *uio, int ioflag)
333 {
334 #ifdef PERIPH_1284
335 u_int unit = minor(dev);
336 struct ppi_data *ppi = UNITOSOFTC(unit);
337 device_t ppidev = UNITODEVICE(unit);
338 device_t ppbus = device_get_parent(ppidev);
339 int len, error = 0;
340
341 switch (ppb_1284_get_state(ppbus)) {
342 case PPB_PERIPHERAL_IDLE:
343 ppb_peripheral_terminate(ppbus, 0);
344 /* FALLTHROUGH */
345
346 case PPB_FORWARD_IDLE:
347 /* if can't negotiate NIBBLE mode then try BYTE mode,
348 * the peripheral may be a computer
349 */
350 if ((ppb_1284_negociate(ppbus,
351 ppi->ppi_mode = PPB_NIBBLE, 0))) {
352
353 /* XXX Wait 2 seconds to let the remote host some
354 * time to terminate its interrupt
355 */
356 tsleep(ppi, PPBPRI, "ppiread", 2*hz);
357
358 if ((error = ppb_1284_negociate(ppbus,
359 ppi->ppi_mode = PPB_BYTE, 0)))
360 return (error);
361 }
362 break;
363
364 case PPB_REVERSE_IDLE:
365 case PPB_EPP_IDLE:
366 case PPB_ECP_FORWARD_IDLE:
367 default:
368 break;
369 }
370
371 #ifdef DEBUG_1284
372 printf("N");
373 #endif
374 /* read data */
375 len = 0;
376 while (uio->uio_resid) {
377 if ((error = ppb_1284_read(ppbus, ppi->ppi_mode,
378 ppi->ppi_buffer, min(BUFSIZE, uio->uio_resid),
379 &len))) {
380 goto error;
381 }
382
383 if (!len)
384 goto error; /* no more data */
385
386 #ifdef DEBUG_1284
387 printf("d");
388 #endif
389 if ((error = uiomove(ppi->ppi_buffer, len, uio)))
390 goto error;
391 }
392
393 error:
394
395 #else /* PERIPH_1284 */
396 int error = ENODEV;
397 #endif
398
399 return (error);
400 }
401
402 /*
403 * ppiwrite()
404 *
405 * IEEE1284 compliant write
406 *
407 * Actually, this is the peripheral side of a remote IEEE1284 read
408 *
409 * The first part of the negotiation (IEEE1284 device detection) is
410 * done at interrupt level, then the remaining is done by the writing
411 * process
412 *
413 * Once negotiation done, transfer data
414 */
415 static int
416 ppiwrite(struct cdev *dev, struct uio *uio, int ioflag)
417 {
418 #ifdef PERIPH_1284
419 u_int unit = minor(dev);
420 struct ppi_data *ppi = UNITOSOFTC(unit);
421 device_t ppidev = UNITODEVICE(unit);
422 device_t ppbus = device_get_parent(ppidev);
423 int len, error = 0, sent;
424
425 #if 0
426 int ret;
427
428 #define ADDRESS MS_PARAM(0, 0, MS_TYP_PTR)
429 #define LENGTH MS_PARAM(0, 1, MS_TYP_INT)
430
431 struct ppb_microseq msq[] = {
432 { MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } },
433 MS_RET(0)
434 };
435
436 /* negotiate ECP mode */
437 if (ppb_1284_negociate(ppbus, PPB_ECP, 0)) {
438 printf("ppiwrite: ECP negotiation failed\n");
439 }
440
441 while (!error && (len = min(uio->uio_resid, BUFSIZE))) {
442 uiomove(ppi->ppi_buffer, len, uio);
443
444 ppb_MS_init_msq(msq, 2, ADDRESS, ppi->ppi_buffer, LENGTH, len);
445
446 error = ppb_MS_microseq(ppbus, msq, &ret);
447 }
448 #endif
449
450 /* we have to be peripheral to be able to send data, so
451 * wait for the appropriate state
452 */
453 if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOCIATION)
454 ppb_1284_terminate(ppbus);
455
456 while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) {
457 /* XXX should check a variable before sleeping */
458 #ifdef DEBUG_1284
459 printf("s");
460 #endif
461
462 ppi_enable_intr(ppidev);
463
464 /* sleep until IEEE1284 negotiation starts */
465 error = tsleep(ppi, PCATCH | PPBPRI, "ppiwrite", 0);
466
467 switch (error) {
468 case 0:
469 /* negotiate peripheral side with BYTE mode */
470 ppb_peripheral_negociate(ppbus, PPB_BYTE, 0);
471 break;
472 case EWOULDBLOCK:
473 break;
474 default:
475 goto error;
476 }
477 }
478 #ifdef DEBUG_1284
479 printf("N");
480 #endif
481
482 /* negotiation done, write bytes to master host */
483 while ((len = min(uio->uio_resid, BUFSIZE)) != 0) {
484 uiomove(ppi->ppi_buffer, len, uio);
485 if ((error = byte_peripheral_write(ppbus,
486 ppi->ppi_buffer, len, &sent)))
487 goto error;
488 #ifdef DEBUG_1284
489 printf("d");
490 #endif
491 }
492
493 error:
494
495 #else /* PERIPH_1284 */
496 int error = ENODEV;
497 #endif
498
499 return (error);
500 }
501
502 static int
503 ppiioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
504 {
505 u_int unit = minor(dev);
506 device_t ppidev = UNITODEVICE(unit);
507 device_t ppbus = device_get_parent(ppidev);
508 int error = 0;
509 u_int8_t *val = (u_int8_t *)data;
510
511 switch (cmd) {
512
513 case PPIGDATA: /* get data register */
514 *val = ppb_rdtr(ppbus);
515 break;
516 case PPIGSTATUS: /* get status bits */
517 *val = ppb_rstr(ppbus);
518 break;
519 case PPIGCTRL: /* get control bits */
520 *val = ppb_rctr(ppbus);
521 break;
522 case PPIGEPPD: /* get EPP data bits */
523 *val = ppb_repp_D(ppbus);
524 break;
525 case PPIGECR: /* get ECP bits */
526 *val = ppb_recr(ppbus);
527 break;
528 case PPIGFIFO: /* read FIFO */
529 *val = ppb_rfifo(ppbus);
530 break;
531 case PPISDATA: /* set data register */
532 ppb_wdtr(ppbus, *val);
533 break;
534 case PPISSTATUS: /* set status bits */
535 ppb_wstr(ppbus, *val);
536 break;
537 case PPISCTRL: /* set control bits */
538 ppb_wctr(ppbus, *val);
539 break;
540 case PPISEPPD: /* set EPP data bits */
541 ppb_wepp_D(ppbus, *val);
542 break;
543 case PPISECR: /* set ECP bits */
544 ppb_wecr(ppbus, *val);
545 break;
546 case PPISFIFO: /* write FIFO */
547 ppb_wfifo(ppbus, *val);
548 break;
549 case PPIGEPPA: /* get EPP address bits */
550 *val = ppb_repp_A(ppbus);
551 break;
552 case PPISEPPA: /* set EPP address bits */
553 ppb_wepp_A(ppbus, *val);
554 break;
555 default:
556 error = ENOTTY;
557 break;
558 }
559
560 return (error);
561 }
562
563 static device_method_t ppi_methods[] = {
564 /* device interface */
565 DEVMETHOD(device_identify, ppi_identify),
566 DEVMETHOD(device_probe, ppi_probe),
567 DEVMETHOD(device_attach, ppi_attach),
568
569 { 0, 0 }
570 };
571
572 static driver_t ppi_driver = {
573 "ppi",
574 ppi_methods,
575 sizeof(struct ppi_data),
576 };
577 DRIVER_MODULE(ppi, ppbus, ppi_driver, ppi_devclass, 0, 0);
Cache object: adad2aca2fcbda1d3d681583107a3ebb
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