1 /*
2 * Copyright (c) 1996, Sujal M. Patel
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 * $FreeBSD: src/sys/isa/pnp.c,v 1.5.2.1 2002/10/14 09:31:09 nyan Exp $
27 * from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp
28 */
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/bus.h>
35 #include <sys/malloc.h>
36 #include "isavar.h"
37 #include "pnpreg.h"
38 #include "pnpvar.h"
39 #include <machine/clock.h>
40
41 typedef struct _pnp_id {
42 u_int32_t vendor_id;
43 u_int32_t serial;
44 u_char checksum;
45 } pnp_id;
46
47 struct pnp_set_config_arg {
48 int csn; /* Card number to configure */
49 int ldn; /* Logical device on card */
50 };
51
52 struct pnp_quirk {
53 u_int32_t vendor_id; /* Vendor of the card */
54 u_int32_t logical_id; /* ID of the device with quirk */
55 int type;
56 int arg1;
57 int arg2;
58 };
59
60 #define PNP_QUIRK_WRITE_REG 1 /* Need to write a pnp register */
61 #define PNP_QUIRK_EXTRA_IO 2 /* Has extra io ports */
62
63 struct pnp_quirk pnp_quirks[] = {
64 /*
65 * The Gravis UltraSound needs register 0xf2 to be set to 0xff
66 * to enable power.
67 * XXX need to know the logical device id.
68 */
69 { 0x0100561e /* GRV0001 */, 0,
70 PNP_QUIRK_WRITE_REG, 0xf2, 0xff },
71 /*
72 * An emu8000 does not give us other than the first
73 * port.
74 */
75 { 0x0100561e /* GRV0001 */, 0,
76 PNP_QUIRK_WRITE_REG, 0xf2, 0xff },
77 /*
78 * An emu8000 does not give us other than the first
79 * port.
80 */
81 { 0x26008c0e /* SB16 */, 0x21008c0e,
82 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
83 { 0x42008c0e /* SB32(CTL0042) */, 0x21008c0e,
84 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
85 { 0x44008c0e /* SB32(CTL0044) */, 0x21008c0e,
86 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
87 { 0x49008c0e /* SB32(CTL0049) */, 0x21008c0e,
88 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
89 { 0xf1008c0e /* SB32(CTL00f1) */, 0x21008c0e,
90 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
91 { 0xc1008c0e /* SB64(CTL00c1) */, 0x22008c0e,
92 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
93 { 0xc5008c0e /* SB64(CTL00c5) */, 0x22008c0e,
94 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
95 { 0xe4008c0e /* SB64(CTL00e4) */, 0x22008c0e,
96 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
97
98 { 0 }
99 };
100
101 /* The READ_DATA port that we are using currently */
102 static int pnp_rd_port;
103
104 static void pnp_send_initiation_key(void);
105 static int pnp_get_serial(pnp_id *p);
106 static int pnp_isolation_protocol(device_t parent);
107
108 char *
pnp_eisaformat(u_int32_t id)109 pnp_eisaformat(u_int32_t id)
110 {
111 u_int8_t *data = (u_int8_t *) &id;
112 static char idbuf[8];
113 const char hextoascii[] = "0123456789abcdef";
114
115 idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
116 idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
117 idbuf[2] = '@' + (data[1] & 0x1f);
118 idbuf[3] = hextoascii[(data[2] >> 4)];
119 idbuf[4] = hextoascii[(data[2] & 0xf)];
120 idbuf[5] = hextoascii[(data[3] >> 4)];
121 idbuf[6] = hextoascii[(data[3] & 0xf)];
122 idbuf[7] = 0;
123 return(idbuf);
124 }
125
126 static void
pnp_write(int d,u_char r)127 pnp_write(int d, u_char r)
128 {
129 outb (_PNP_ADDRESS, d);
130 outb (_PNP_WRITE_DATA, r);
131 }
132
133 #if 0
134
135 static u_char
136 pnp_read(int d)
137 {
138 outb (_PNP_ADDRESS, d);
139 return (inb(3 | (pnp_rd_port <<2)));
140 }
141
142 #endif
143
144 /*
145 * Send Initiation LFSR as described in "Plug and Play ISA Specification",
146 * Intel May 94.
147 */
148 static void
pnp_send_initiation_key(void)149 pnp_send_initiation_key(void)
150 {
151 int cur, i;
152
153 /* Reset the LSFR */
154 outb(_PNP_ADDRESS, 0);
155 outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
156
157 cur = 0x6a;
158 outb(_PNP_ADDRESS, cur);
159
160 for (i = 1; i < 32; i++) {
161 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
162 outb(_PNP_ADDRESS, cur);
163 }
164 }
165
166
167 /*
168 * Get the device's serial number. Returns 1 if the serial is valid.
169 */
170 static int
pnp_get_serial(pnp_id * p)171 pnp_get_serial(pnp_id *p)
172 {
173 int i, bit, valid = 0, sum = 0x6a;
174 u_char *data = (u_char *)p;
175
176 bzero(data, sizeof(char) * 9);
177 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
178 for (i = 0; i < 72; i++) {
179 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
180 DELAY(250); /* Delay 250 usec */
181
182 /* Can't Short Circuit the next evaluation, so 'and' is last */
183 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
184 DELAY(250); /* Delay 250 usec */
185
186 valid = valid || bit;
187
188 if (i < 64)
189 sum = (sum >> 1) |
190 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
191
192 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
193 }
194
195 valid = valid && (data[8] == sum);
196
197 return valid;
198 }
199
200 /*
201 * Fill's the buffer with resource info from the device.
202 * Returns the number of characters read.
203 */
204 static int
pnp_get_resource_info(u_char * buffer,int len)205 pnp_get_resource_info(u_char *buffer, int len)
206 {
207 int i, j, count;
208 u_char temp;
209
210 count = 0;
211 for (i = 0; i < len; i++) {
212 outb(_PNP_ADDRESS, PNP_STATUS);
213 for (j = 0; j < 100; j++) {
214 if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
215 break;
216 DELAY(1);
217 }
218 if (j == 100) {
219 kprintf("PnP device failed to report resource data\n");
220 return count;
221 }
222 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
223 temp = inb((pnp_rd_port << 2) | 0x3);
224 if (buffer != NULL)
225 buffer[i] = temp;
226 count++;
227 }
228 return count;
229 }
230
231 /*
232 * This function is called after the bus has assigned resource
233 * locations for a logical device.
234 */
235 static void
pnp_set_config(void * arg,struct isa_config * config,int enable)236 pnp_set_config(void *arg, struct isa_config *config, int enable)
237 {
238 int csn = ((struct pnp_set_config_arg *) arg)->csn;
239 int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
240 int i;
241
242 /*
243 * First put all cards into Sleep state with the initiation
244 * key, then put our card into Config state.
245 */
246 pnp_send_initiation_key();
247 pnp_write(PNP_WAKE, csn);
248
249 /*
250 * Select our logical device so that we can program it.
251 */
252 pnp_write(PNP_SET_LDN, ldn);
253
254 /*
255 * Now program the resources.
256 */
257 for (i = 0; i < config->ic_nmem; i++) {
258 u_int32_t start = config->ic_mem[i].ir_start;
259 u_int32_t size = config->ic_mem[i].ir_size;
260 if (start & 0xff)
261 panic("pnp_set_config: bogus memory assignment");
262 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
263 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
264 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
265 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
266 }
267 for (; i < ISA_NMEM; i++) {
268 pnp_write(PNP_MEM_BASE_HIGH(i), 0);
269 pnp_write(PNP_MEM_BASE_LOW(i), 0);
270 pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
271 pnp_write(PNP_MEM_RANGE_LOW(i), 0);
272 }
273
274 for (i = 0; i < config->ic_nport; i++) {
275 u_int32_t start = config->ic_port[i].ir_start;
276 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
277 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
278 }
279 for (; i < ISA_NPORT; i++) {
280 pnp_write(PNP_IO_BASE_HIGH(i), 0);
281 pnp_write(PNP_IO_BASE_LOW(i), 0);
282 }
283
284 for (i = 0; i < config->ic_nirq; i++) {
285 int irq = ffs(config->ic_irqmask[i]) - 1;
286 pnp_write(PNP_IRQ_LEVEL(i), irq);
287 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
288 }
289 for (; i < ISA_NIRQ; i++) {
290 /*
291 * IRQ 0 is not a valid interrupt selection and
292 * represents no interrupt selection.
293 */
294 pnp_write(PNP_IRQ_LEVEL(i), 0);
295 }
296
297 for (i = 0; i < config->ic_ndrq; i++) {
298 int drq = ffs(config->ic_drqmask[i]) - 1;
299 pnp_write(PNP_DMA_CHANNEL(i), drq);
300 }
301 for (; i < ISA_NDRQ; i++) {
302 /*
303 * DMA channel 4, the cascade channel is used to
304 * indicate no DMA channel is active.
305 */
306 pnp_write(PNP_DMA_CHANNEL(i), 4);
307 }
308
309 pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
310
311 /*
312 * Wake everyone up again, we are finished.
313 */
314 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
315 }
316
317 /*
318 * Process quirks for a logical device.. The card must be in Config state.
319 */
320 void
pnp_check_quirks(u_int32_t vendor_id,u_int32_t logical_id,int ldn,struct isa_config * config)321 pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id,
322 int ldn, struct isa_config *config)
323 {
324 struct pnp_quirk *qp;
325
326 for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
327 if (qp->vendor_id == vendor_id
328 && (qp->logical_id == 0
329 || qp->logical_id == logical_id)) {
330 switch (qp->type) {
331 case PNP_QUIRK_WRITE_REG:
332 pnp_write(PNP_SET_LDN, ldn);
333 pnp_write(qp->arg1, qp->arg2);
334 break;
335 case PNP_QUIRK_EXTRA_IO:
336 if (config == NULL)
337 break;
338 if (qp->arg1 != 0) {
339 config->ic_nport++;
340 config->ic_port[config->ic_nport - 1] = config->ic_port[0];
341 config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
342 config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
343 }
344 if (qp->arg2 != 0) {
345 config->ic_nport++;
346 config->ic_port[config->ic_nport - 1] = config->ic_port[0];
347 config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
348 config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
349 }
350 break;
351
352 }
353 }
354 }
355 }
356
357 /*
358 * Scan Resource Data for Logical Devices.
359 *
360 * This function exits as soon as it gets an error reading *ANY*
361 * Resource Data or it reaches the end of Resource Data. In the first
362 * case the return value will be TRUE, FALSE otherwise.
363 */
364 static int
pnp_create_devices(device_t parent,pnp_id * p,int csn,u_char * resources,int len)365 pnp_create_devices(device_t parent, pnp_id *p, int csn,
366 u_char *resources, int len)
367 {
368 u_char tag, *resp, *resinfo, *startres = NULL;
369 int large_len, scanning = len, retval = FALSE;
370 u_int32_t logical_id;
371 device_t dev = NULL;
372 int ldn = 0;
373 struct pnp_set_config_arg *csnldn;
374 char buf[100];
375 char *desc = NULL;
376
377 resp = resources;
378 while (scanning > 0) {
379 tag = *resp++;
380 scanning--;
381 if (PNP_RES_TYPE(tag) != 0) {
382 /* Large resource */
383 if (scanning < 2) {
384 scanning = 0;
385 continue;
386 }
387 large_len = resp[0] + (resp[1] << 8);
388 resp += 2;
389
390 if (scanning < large_len) {
391 scanning = 0;
392 continue;
393 }
394 resinfo = resp;
395 resp += large_len;
396 scanning -= large_len;
397
398 if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
399 if (large_len > sizeof(buf) - 1)
400 large_len = sizeof(buf) - 1;
401 bcopy(resinfo, buf, large_len);
402
403 /*
404 * Trim trailing spaces.
405 */
406 while (buf[large_len-1] == ' ')
407 large_len--;
408 buf[large_len] = '\0';
409 desc = buf;
410 if (dev)
411 device_set_desc_copy(dev, desc);
412 continue;
413 }
414
415 continue;
416 }
417
418 /* Small resource */
419 if (scanning < PNP_SRES_LEN(tag)) {
420 scanning = 0;
421 continue;
422 }
423 resinfo = resp;
424 resp += PNP_SRES_LEN(tag);
425 scanning -= PNP_SRES_LEN(tag);
426
427 switch (PNP_SRES_NUM(tag)) {
428 case PNP_TAG_LOGICAL_DEVICE:
429 /*
430 * Parse the resources for the previous
431 * logical device (if any).
432 */
433 if (startres) {
434 pnp_parse_resources(dev, startres,
435 resinfo - startres - 1, ldn);
436 dev = NULL;
437 startres = NULL;
438 }
439
440 /*
441 * A new logical device. Scan for end of
442 * resources.
443 */
444 bcopy(resinfo, &logical_id, 4);
445 pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
446 dev = BUS_ADD_CHILD(parent, parent, ISA_ORDER_PNP,
447 NULL, -1);
448 if (desc)
449 device_set_desc_copy(dev, desc);
450 isa_set_vendorid(dev, p->vendor_id);
451 isa_set_serial(dev, p->serial);
452 isa_set_logicalid(dev, logical_id);
453 csnldn = kmalloc(sizeof *csnldn, M_DEVBUF, M_WAITOK);
454 csnldn->csn = csn;
455 csnldn->ldn = ldn;
456 ISA_SET_CONFIG_CALLBACK(parent, dev,
457 pnp_set_config, csnldn);
458 ldn++;
459 startres = resp;
460 break;
461
462 case PNP_TAG_END:
463 if (!startres) {
464 device_printf(parent,
465 "malformed resources\n");
466 scanning = 0;
467 break;
468 }
469 pnp_parse_resources(dev, startres,
470 resinfo - startres - 1, ldn);
471 dev = NULL;
472 startres = NULL;
473 scanning = 0;
474 break;
475
476 default:
477 /* Skip this resource */
478 break;
479 }
480 }
481
482 return retval;
483 }
484
485 /*
486 * Read 'amount' bytes of resources from the card, allocating memory
487 * as needed. If a buffer is already available, it should be passed in
488 * '*resourcesp' and its length in '*spacep'. The number of resource
489 * bytes already in the buffer should be passed in '*lenp'. The memory
490 * allocated will be returned in '*resourcesp' with its size and the
491 * number of bytes of resources in '*spacep' and '*lenp' respectively.
492 */
493 static int
pnp_read_bytes(int amount,u_char ** resourcesp,int * spacep,int * lenp)494 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
495 {
496 u_char *resources = *resourcesp;
497 u_char *newres;
498 int space = *spacep;
499 int len = *lenp;
500
501 if (space == 0) {
502 space = 1024;
503 resources = kmalloc(space, M_TEMP, M_WAITOK);
504 }
505
506 if (len + amount > space) {
507 int extra = 1024;
508 while (len + amount > space + extra)
509 extra += 1024;
510 newres = kmalloc(space + extra, M_TEMP, M_WAITOK);
511 bcopy(resources, newres, len);
512 kfree(resources, M_TEMP);
513 resources = newres;
514 space += extra;
515 }
516
517 if (pnp_get_resource_info(resources + len, amount) != amount)
518 return EINVAL;
519 len += amount;
520
521 *resourcesp = resources;
522 *spacep = space;
523 *lenp = len;
524
525 return 0;
526 }
527
528 /*
529 * Read all resources from the card, allocating memory as needed. If a
530 * buffer is already available, it should be passed in '*resourcesp'
531 * and its length in '*spacep'. The memory allocated will be returned
532 * in '*resourcesp' with its size and the number of bytes of resources
533 * in '*spacep' and '*lenp' respectively.
534 */
535 static int
pnp_read_resources(u_char ** resourcesp,int * spacep,int * lenp)536 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
537 {
538 u_char *resources = *resourcesp;
539 int space = *spacep;
540 int len = 0;
541 int error, done;
542 u_char tag;
543
544 error = 0;
545 done = 0;
546 while (!done) {
547 error = pnp_read_bytes(1, &resources, &space, &len);
548 if (error)
549 goto out;
550 tag = resources[len-1];
551 if (PNP_RES_TYPE(tag) == 0) {
552 /*
553 * Small resource, read contents.
554 */
555 error = pnp_read_bytes(PNP_SRES_LEN(tag),
556 &resources, &space, &len);
557 if (error)
558 goto out;
559 if (PNP_SRES_NUM(tag) == PNP_TAG_END)
560 done = 1;
561 } else {
562 /*
563 * Large resource, read length and contents.
564 */
565 error = pnp_read_bytes(2, &resources, &space, &len);
566 if (error)
567 goto out;
568 error = pnp_read_bytes(resources[len-2]
569 + (resources[len-1] << 8),
570 &resources, &space, &len);
571 if (error)
572 goto out;
573 }
574 }
575
576 out:
577 *resourcesp = resources;
578 *spacep = space;
579 *lenp = len;
580 return error;
581 }
582
583 /*
584 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
585 * value (caller should try multiple READ_DATA locations before giving
586 * up). Upon exiting, all cards are aware that they should use
587 * pnp_rd_port as the READ_DATA port.
588 *
589 * In the first pass, a csn is assigned to each board and pnp_id's
590 * are saved to an array, pnp_devices. In the second pass, each
591 * card is woken up and the device configuration is called.
592 */
593 static int
pnp_isolation_protocol(device_t parent)594 pnp_isolation_protocol(device_t parent)
595 {
596 int csn;
597 pnp_id id;
598 int found = 0, len;
599 u_char *resources = NULL;
600 int space = 0;
601 int error;
602
603 /*
604 * Put all cards into the Sleep state so that we can clear
605 * their CSNs.
606 */
607 pnp_send_initiation_key();
608
609 /*
610 * Clear the CSN for all cards.
611 */
612 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
613
614 /*
615 * Move all cards to the Isolation state.
616 */
617 pnp_write(PNP_WAKE, 0);
618
619 /*
620 * Tell them where the read point is going to be this time.
621 */
622 pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
623
624 for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
625 /*
626 * Start the serial isolation protocol.
627 */
628 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
629 DELAY(1000); /* Delay 1 msec */
630
631 if (pnp_get_serial(&id)) {
632 /*
633 * We have read the id from a card
634 * successfully. The card which won the
635 * isolation protocol will be in Isolation
636 * mode and all others will be in Sleep.
637 * Program the CSN of the isolated card
638 * (taking it to Config state) and read its
639 * resources, creating devices as we find
640 * logical devices on the card.
641 */
642 pnp_write(PNP_SET_CSN, csn);
643
644 error = pnp_read_resources(&resources,
645 &space,
646 &len);
647 if (error)
648 break;
649 pnp_create_devices(parent, &id, csn,
650 resources, len);
651 found++;
652 } else
653 break;
654
655 /*
656 * Put this card back to the Sleep state and
657 * simultaneously move all cards which don't have a
658 * CSN yet to Isolation state.
659 */
660 pnp_write(PNP_WAKE, 0);
661 }
662
663 /*
664 * Unless we have chosen the wrong read port, all cards will
665 * be in Sleep state. Put them back into WaitForKey for
666 * now. Their resources will be programmed later.
667 */
668 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
669
670 /*
671 * Cleanup.
672 */
673 if (resources)
674 kfree(resources, M_TEMP);
675
676 return found;
677 }
678
679
680 /*
681 * pnp_identify()
682 *
683 * autoconfiguration of pnp devices. This routine just runs the
684 * isolation protocol over several ports, until one is successful.
685 *
686 * may be called more than once ?
687 *
688 */
689 static int
pnp_identify(driver_t * driver,device_t parent)690 pnp_identify(driver_t *driver, device_t parent)
691 {
692 int num_pnp_devs;
693
694 /*
695 * We do not support rescanning PNP devices, just return
696 * success (leave the previously scanned devices intact).
697 */
698 if (device_get_state(parent) == DS_ATTACHED)
699 return (0);
700 if (device_get_state(parent) == DS_INPROGRESS)
701 return (0);
702
703 #if 0
704 if (pnp_ldn_overrides[0].csn == 0) {
705 if (bootverbose)
706 kprintf("Initializing PnP override table\n");
707 bzero (pnp_ldn_overrides, sizeof(pnp_ldn_overrides));
708 pnp_ldn_overrides[0].csn = 255 ;
709 }
710 #endif
711
712 /* Try various READ_DATA ports from 0x203-0x3ff */
713 for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
714 if (bootverbose)
715 kprintf("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3);
716
717 num_pnp_devs = pnp_isolation_protocol(parent);
718 if (num_pnp_devs)
719 break;
720 }
721 return (num_pnp_devs ? 0 : ENXIO);
722 }
723
724 /*
725 * This causes pnp_identify() to be called for any attached ISA bus in
726 * the system.
727 */
728 static device_method_t pnp_methods[] = {
729 /* Device interface */
730 DEVMETHOD(device_identify, pnp_identify),
731
732 DEVMETHOD_END
733 };
734
735 static driver_t pnp_driver = {
736 "pnp",
737 pnp_methods,
738 1, /* no softc */
739 };
740
741 static devclass_t pnp_devclass;
742
743 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, NULL, NULL);
744