1 /*
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1996, Sujal M. Patel
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp
29 */
30
31 #include <sys/cdefs.h>
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <sys/bus.h>
37 #include <sys/endian.h>
38 #include <sys/malloc.h>
39 #include <isa/isavar.h>
40 #include <isa/pnpreg.h>
41 #include <isa/pnpvar.h>
42 #include <machine/bus.h>
43
44 typedef struct _pnp_id {
45 uint32_t vendor_id;
46 uint32_t serial;
47 u_char checksum;
48 } pnp_id;
49
50 struct pnp_set_config_arg {
51 int csn; /* Card number to configure */
52 int ldn; /* Logical device on card */
53 };
54
55 struct pnp_quirk {
56 uint32_t vendor_id; /* Vendor of the card */
57 uint32_t logical_id; /* ID of the device with quirk */
58 int type;
59 #define PNP_QUIRK_WRITE_REG 1 /* Need to write a pnp register */
60 #define PNP_QUIRK_EXTRA_IO 2 /* Has extra io ports */
61 int arg1;
62 int arg2;
63 };
64
65 struct pnp_quirk pnp_quirks[] = {
66 /*
67 * The Gravis UltraSound needs register 0xf2 to be set to 0xff
68 * to enable power.
69 * XXX need to know the logical device id.
70 */
71 { 0x0100561e /* GRV0001 */, 0,
72 PNP_QUIRK_WRITE_REG, 0xf2, 0xff },
73 /*
74 * An emu8000 does not give us other than the first
75 * port.
76 */
77 { 0x26008c0e /* SB16 */, 0x21008c0e,
78 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
79 { 0x42008c0e /* SB32(CTL0042) */, 0x21008c0e,
80 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
81 { 0x44008c0e /* SB32(CTL0044) */, 0x21008c0e,
82 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
83 { 0x49008c0e /* SB32(CTL0049) */, 0x21008c0e,
84 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
85 { 0xf1008c0e /* SB32(CTL00f1) */, 0x21008c0e,
86 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
87 { 0xc1008c0e /* SB64(CTL00c1) */, 0x22008c0e,
88 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
89 { 0xc5008c0e /* SB64(CTL00c5) */, 0x22008c0e,
90 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
91 { 0xe4008c0e /* SB64(CTL00e4) */, 0x22008c0e,
92 PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
93
94 { 0 }
95 };
96
97 /* The READ_DATA port that we are using currently */
98 static int pnp_rd_port;
99
100 static void pnp_send_initiation_key(void);
101 static int pnp_get_serial(pnp_id *p);
102 static int pnp_isolation_protocol(device_t parent);
103
104 static void
pnp_write(int d,u_char r)105 pnp_write(int d, u_char r)
106 {
107 outb (_PNP_ADDRESS, d);
108 outb (_PNP_WRITE_DATA, r);
109 }
110
111 /*
112 * Send Initiation LFSR as described in "Plug and Play ISA Specification",
113 * Intel May 94.
114 */
115 static void
pnp_send_initiation_key(void)116 pnp_send_initiation_key(void)
117 {
118 int cur, i;
119
120 /* Reset the LSFR */
121 outb(_PNP_ADDRESS, 0);
122 outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
123
124 cur = 0x6a;
125 outb(_PNP_ADDRESS, cur);
126
127 for (i = 1; i < 32; i++) {
128 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
129 outb(_PNP_ADDRESS, cur);
130 }
131 }
132
133
134 /*
135 * Get the device's serial number. Returns 1 if the serial is valid.
136 */
137 static int
pnp_get_serial(pnp_id * p)138 pnp_get_serial(pnp_id *p)
139 {
140 int i, bit, valid = 0, sum = 0x6a;
141 u_char *data = (u_char *)p;
142
143 bzero(data, sizeof(char) * 9);
144 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
145 for (i = 0; i < 72; i++) {
146 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
147 DELAY(250); /* Delay 250 usec */
148
149 /* Can't Short Circuit the next evaluation, so 'and' is last */
150 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
151 DELAY(250); /* Delay 250 usec */
152
153 valid = valid || bit;
154 if (i < 64)
155 sum = (sum >> 1) |
156 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
157 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
158 }
159
160 valid = valid && (data[8] == sum);
161
162 return (valid);
163 }
164
165 /*
166 * Fill's the buffer with resource info from the device.
167 * Returns the number of characters read.
168 */
169 static int
pnp_get_resource_info(u_char * buffer,int len)170 pnp_get_resource_info(u_char *buffer, int len)
171 {
172 int i, j, count;
173 u_char temp;
174
175 count = 0;
176 for (i = 0; i < len; i++) {
177 outb(_PNP_ADDRESS, PNP_STATUS);
178 for (j = 0; j < 100; j++) {
179 if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
180 break;
181 DELAY(10);
182 }
183 if (j == 100) {
184 printf("PnP device failed to report resource data\n");
185 return (count);
186 }
187 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
188 temp = inb((pnp_rd_port << 2) | 0x3);
189 if (buffer != NULL)
190 buffer[i] = temp;
191 count++;
192 }
193 return (count);
194 }
195
196 /*
197 * This function is called after the bus has assigned resource
198 * locations for a logical device.
199 */
200 static void
pnp_set_config(void * arg,struct isa_config * config,int enable)201 pnp_set_config(void *arg, struct isa_config *config, int enable)
202 {
203 int csn = ((struct pnp_set_config_arg *) arg)->csn;
204 int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
205 int i;
206
207 /*
208 * First put all cards into Sleep state with the initiation
209 * key, then put our card into Config state.
210 */
211 pnp_send_initiation_key();
212 pnp_write(PNP_WAKE, csn);
213
214 /*
215 * Select our logical device so that we can program it.
216 */
217 pnp_write(PNP_SET_LDN, ldn);
218
219 /*
220 * Constrain the number of resources we will try to program
221 */
222 if (config->ic_nmem > ISA_PNP_NMEM) {
223 printf("too many ISA memory ranges (%d > %d)\n",
224 config->ic_nmem, ISA_PNP_NMEM);
225 config->ic_nmem = ISA_PNP_NMEM;
226 }
227 if (config->ic_nport > ISA_PNP_NPORT) {
228 printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport,
229 ISA_PNP_NPORT);
230 config->ic_nport = ISA_PNP_NPORT;
231 }
232 if (config->ic_nirq > ISA_PNP_NIRQ) {
233 printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq,
234 ISA_PNP_NIRQ);
235 config->ic_nirq = ISA_PNP_NIRQ;
236 }
237 if (config->ic_ndrq > ISA_PNP_NDRQ) {
238 printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq,
239 ISA_PNP_NDRQ);
240 config->ic_ndrq = ISA_PNP_NDRQ;
241 }
242
243 /*
244 * Now program the resources.
245 */
246 for (i = 0; i < config->ic_nmem; i++) {
247 uint32_t start;
248 uint32_t size;
249
250 /* XXX: should handle memory control register, 32 bit memory */
251 if (config->ic_mem[i].ir_size == 0) {
252 pnp_write(PNP_MEM_BASE_HIGH(i), 0);
253 pnp_write(PNP_MEM_BASE_LOW(i), 0);
254 pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
255 pnp_write(PNP_MEM_RANGE_LOW(i), 0);
256 } else {
257 start = config->ic_mem[i].ir_start;
258 size = config->ic_mem[i].ir_size;
259 if (start & 0xff)
260 panic("pnp_set_config: bogus memory assignment");
261 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
262 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
263 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
264 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
265 }
266 }
267 for (; i < ISA_PNP_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 uint32_t start;
276
277 if (config->ic_port[i].ir_size == 0) {
278 pnp_write(PNP_IO_BASE_HIGH(i), 0);
279 pnp_write(PNP_IO_BASE_LOW(i), 0);
280 } else {
281 start = config->ic_port[i].ir_start;
282 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
283 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
284 }
285 }
286 for (; i < ISA_PNP_NPORT; i++) {
287 pnp_write(PNP_IO_BASE_HIGH(i), 0);
288 pnp_write(PNP_IO_BASE_LOW(i), 0);
289 }
290
291 for (i = 0; i < config->ic_nirq; i++) {
292 int irq;
293
294 /* XXX: interrupt type */
295 if (config->ic_irqmask[i] == 0) {
296 pnp_write(PNP_IRQ_LEVEL(i), 0);
297 pnp_write(PNP_IRQ_TYPE(i), 2);
298 } else {
299 irq = ffs(config->ic_irqmask[i]) - 1;
300 pnp_write(PNP_IRQ_LEVEL(i), irq);
301 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
302 }
303 }
304 for (; i < ISA_PNP_NIRQ; i++) {
305 /*
306 * IRQ 0 is not a valid interrupt selection and
307 * represents no interrupt selection.
308 */
309 pnp_write(PNP_IRQ_LEVEL(i), 0);
310 pnp_write(PNP_IRQ_TYPE(i), 2);
311 }
312
313 for (i = 0; i < config->ic_ndrq; i++) {
314 int drq;
315
316 if (config->ic_drqmask[i] == 0) {
317 pnp_write(PNP_DMA_CHANNEL(i), 4);
318 } else {
319 drq = ffs(config->ic_drqmask[i]) - 1;
320 pnp_write(PNP_DMA_CHANNEL(i), drq);
321 }
322 }
323 for (; i < ISA_PNP_NDRQ; i++) {
324 /*
325 * DMA channel 4, the cascade channel is used to
326 * indicate no DMA channel is active.
327 */
328 pnp_write(PNP_DMA_CHANNEL(i), 4);
329 }
330
331 pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
332
333 /*
334 * Wake everyone up again, we are finished.
335 */
336 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
337 }
338
339 /*
340 * Process quirks for a logical device.. The card must be in Config state.
341 */
342 void
pnp_check_quirks(uint32_t vendor_id,uint32_t logical_id,int ldn,struct isa_config * config)343 pnp_check_quirks(uint32_t vendor_id, uint32_t logical_id, int ldn,
344 struct isa_config *config)
345 {
346 struct pnp_quirk *qp;
347
348 for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
349 if (qp->vendor_id == vendor_id
350 && (qp->logical_id == 0 || qp->logical_id == logical_id)) {
351 switch (qp->type) {
352 case PNP_QUIRK_WRITE_REG:
353 pnp_write(PNP_SET_LDN, ldn);
354 pnp_write(qp->arg1, qp->arg2);
355 break;
356 case PNP_QUIRK_EXTRA_IO:
357 if (config == NULL)
358 break;
359 if (qp->arg1 != 0) {
360 config->ic_nport++;
361 config->ic_port[config->ic_nport - 1] = config->ic_port[0];
362 config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
363 config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
364 }
365 if (qp->arg2 != 0) {
366 config->ic_nport++;
367 config->ic_port[config->ic_nport - 1] = config->ic_port[0];
368 config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
369 config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
370 }
371 break;
372 }
373 }
374 }
375 }
376
377 /*
378 * Scan Resource Data for Logical Devices.
379 *
380 * This function exits as soon as it gets an error reading *ANY*
381 * Resource Data or it reaches the end of Resource Data. In the first
382 * case the return value will be TRUE, FALSE otherwise.
383 */
384 static int
pnp_create_devices(device_t parent,pnp_id * p,int csn,u_char * resources,int len)385 pnp_create_devices(device_t parent, pnp_id *p, int csn,
386 u_char *resources, int len)
387 {
388 u_char tag, *resp, *resinfo, *startres = NULL;
389 int large_len, scanning = len, retval = FALSE;
390 uint32_t logical_id;
391 device_t dev = 0;
392 int ldn = 0;
393 struct pnp_set_config_arg *csnldn;
394 char buf[100];
395 char *desc = NULL;
396
397 resp = resources;
398 while (scanning > 0) {
399 tag = *resp++;
400 scanning--;
401 if (PNP_RES_TYPE(tag) != 0) {
402 /* Large resource */
403 if (scanning < 2) {
404 scanning = 0;
405 continue;
406 }
407 large_len = resp[0] + (resp[1] << 8);
408 resp += 2;
409
410 if (scanning < large_len) {
411 scanning = 0;
412 continue;
413 }
414 resinfo = resp;
415 resp += large_len;
416 scanning -= large_len;
417
418 if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
419 if (dev) {
420 /*
421 * This is an optional device
422 * identifier string. Skip it
423 * for now.
424 */
425 continue;
426 }
427 /* else mandately card identifier string */
428 if (large_len > sizeof(buf) - 1)
429 large_len = sizeof(buf) - 1;
430 bcopy(resinfo, buf, large_len);
431
432 /*
433 * Trim trailing spaces.
434 */
435 while (buf[large_len-1] == ' ')
436 large_len--;
437 buf[large_len] = '\0';
438 desc = buf;
439 continue;
440 }
441
442 continue;
443 }
444
445 /* Small resource */
446 if (scanning < PNP_SRES_LEN(tag)) {
447 scanning = 0;
448 continue;
449 }
450 resinfo = resp;
451 resp += PNP_SRES_LEN(tag);
452 scanning -= PNP_SRES_LEN(tag);
453
454 switch (PNP_SRES_NUM(tag)) {
455 case PNP_TAG_LOGICAL_DEVICE:
456 /*
457 * Parse the resources for the previous
458 * logical device (if any).
459 */
460 if (startres) {
461 pnp_parse_resources(dev, startres,
462 resinfo - startres - 1, ldn);
463 dev = 0;
464 startres = NULL;
465 }
466
467 /*
468 * A new logical device. Scan for end of
469 * resources.
470 */
471 bcopy(resinfo, &logical_id, 4);
472 pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
473 dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
474 if (desc)
475 device_set_desc_copy(dev, desc);
476 else
477 device_set_desc_copy(dev,
478 pnp_eisaformat(logical_id));
479 isa_set_vendorid(dev, p->vendor_id);
480 isa_set_serial(dev, p->serial);
481 isa_set_logicalid(dev, logical_id);
482 isa_set_configattr(dev,
483 ISACFGATTR_CANDISABLE | ISACFGATTR_DYNAMIC);
484 csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT);
485 if (!csnldn) {
486 device_printf(parent, "out of memory\n");
487 scanning = 0;
488 break;
489 }
490 csnldn->csn = csn;
491 csnldn->ldn = ldn;
492 ISA_SET_CONFIG_CALLBACK(parent, dev, pnp_set_config,
493 csnldn);
494 isa_set_pnp_csn(dev, csn);
495 isa_set_pnp_ldn(dev, ldn);
496 ldn++;
497 startres = resp;
498 break;
499
500 case PNP_TAG_END:
501 if (!startres) {
502 device_printf(parent, "malformed resources\n");
503 scanning = 0;
504 break;
505 }
506 pnp_parse_resources(dev, startres,
507 resinfo - startres - 1, ldn);
508 dev = 0;
509 startres = NULL;
510 scanning = 0;
511 break;
512
513 default:
514 /* Skip this resource */
515 break;
516 }
517 }
518
519 return (retval);
520 }
521
522 /*
523 * Read 'amount' bytes of resources from the card, allocating memory
524 * as needed. If a buffer is already available, it should be passed in
525 * '*resourcesp' and its length in '*spacep'. The number of resource
526 * bytes already in the buffer should be passed in '*lenp'. The memory
527 * allocated will be returned in '*resourcesp' with its size and the
528 * number of bytes of resources in '*spacep' and '*lenp' respectively.
529 *
530 * XXX: Multiple problems here, we forget to free() stuff in one
531 * XXX: error return, and in another case we free (*resourcesp) but
532 * XXX: don't tell the caller.
533 */
534 static int
pnp_read_bytes(int amount,u_char ** resourcesp,int * spacep,int * lenp)535 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
536 {
537 u_char *resources = *resourcesp;
538 u_char *newres;
539 int space = *spacep;
540 int len = *lenp;
541
542 if (space == 0) {
543 space = 1024;
544 resources = malloc(space, M_TEMP, M_NOWAIT);
545 if (!resources)
546 return (ENOMEM);
547 }
548
549 if (len + amount > space) {
550 int extra = 1024;
551 while (len + amount > space + extra)
552 extra += 1024;
553 newres = malloc(space + extra, M_TEMP, M_NOWAIT);
554 if (!newres) {
555 /* XXX: free resources */
556 return (ENOMEM);
557 }
558 bcopy(resources, newres, len);
559 free(resources, M_TEMP);
560 resources = newres;
561 space += extra;
562 }
563
564 if (pnp_get_resource_info(resources + len, amount) != amount)
565 return (EINVAL);
566 len += amount;
567
568 *resourcesp = resources;
569 *spacep = space;
570 *lenp = len;
571
572 return (0);
573 }
574
575 /*
576 * Read all resources from the card, allocating memory as needed. If a
577 * buffer is already available, it should be passed in '*resourcesp'
578 * and its length in '*spacep'. The memory allocated will be returned
579 * in '*resourcesp' with its size and the number of bytes of resources
580 * in '*spacep' and '*lenp' respectively.
581 */
582 static int
pnp_read_resources(u_char ** resourcesp,int * spacep,int * lenp)583 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
584 {
585 u_char *resources = *resourcesp;
586 int space = *spacep;
587 int len = 0;
588 int error, done;
589 u_char tag;
590
591 error = 0;
592 done = 0;
593 while (!done) {
594 error = pnp_read_bytes(1, &resources, &space, &len);
595 if (error)
596 goto out;
597 tag = resources[len-1];
598 if (PNP_RES_TYPE(tag) == 0) {
599 /*
600 * Small resource, read contents.
601 */
602 error = pnp_read_bytes(PNP_SRES_LEN(tag),
603 &resources, &space, &len);
604 if (error)
605 goto out;
606 if (PNP_SRES_NUM(tag) == PNP_TAG_END)
607 done = 1;
608 } else {
609 /*
610 * Large resource, read length and contents.
611 */
612 error = pnp_read_bytes(2, &resources, &space, &len);
613 if (error)
614 goto out;
615 error = pnp_read_bytes(resources[len-2]
616 + (resources[len-1] << 8), &resources, &space,
617 &len);
618 if (error)
619 goto out;
620 }
621 }
622
623 out:
624 *resourcesp = resources;
625 *spacep = space;
626 *lenp = len;
627 return (error);
628 }
629
630 /*
631 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
632 * value (caller should try multiple READ_DATA locations before giving
633 * up). Upon exiting, all cards are aware that they should use
634 * pnp_rd_port as the READ_DATA port.
635 *
636 * In the first pass, a csn is assigned to each board and pnp_id's
637 * are saved to an array, pnp_devices. In the second pass, each
638 * card is woken up and the device configuration is called.
639 */
640 static int
pnp_isolation_protocol(device_t parent)641 pnp_isolation_protocol(device_t parent)
642 {
643 int csn;
644 pnp_id id;
645 int found = 0, len;
646 u_char *resources = NULL;
647 int space = 0;
648 int error;
649
650 /*
651 * Put all cards into the Sleep state so that we can clear
652 * their CSNs.
653 */
654 pnp_send_initiation_key();
655
656 /*
657 * Clear the CSN for all cards.
658 */
659 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
660
661 /*
662 * Move all cards to the Isolation state.
663 */
664 pnp_write(PNP_WAKE, 0);
665
666 /*
667 * Tell them where the read point is going to be this time.
668 */
669 pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
670
671 for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
672 /*
673 * Start the serial isolation protocol.
674 */
675 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
676 DELAY(1000); /* Delay 1 msec */
677
678 if (pnp_get_serial(&id)) {
679 /*
680 * We have read the id from a card
681 * successfully. The card which won the
682 * isolation protocol will be in Isolation
683 * mode and all others will be in Sleep.
684 * Program the CSN of the isolated card
685 * (taking it to Config state) and read its
686 * resources, creating devices as we find
687 * logical devices on the card.
688 */
689 pnp_write(PNP_SET_CSN, csn);
690 if (bootverbose)
691 printf("Reading PnP configuration for %s.\n",
692 pnp_eisaformat(id.vendor_id));
693 error = pnp_read_resources(&resources, &space, &len);
694 if (error)
695 break;
696 pnp_create_devices(parent, &id, csn, resources, len);
697 found++;
698 } else
699 break;
700
701 /*
702 * Put this card back to the Sleep state and
703 * simultaneously move all cards which don't have a
704 * CSN yet to Isolation state.
705 */
706 pnp_write(PNP_WAKE, 0);
707 }
708
709 /*
710 * Unless we have chosen the wrong read port, all cards will
711 * be in Sleep state. Put them back into WaitForKey for
712 * now. Their resources will be programmed later.
713 */
714 pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
715
716 /*
717 * Cleanup.
718 */
719 if (resources)
720 free(resources, M_TEMP);
721
722 return (found);
723 }
724
725
726 /*
727 * pnp_identify()
728 *
729 * autoconfiguration of pnp devices. This routine just runs the
730 * isolation protocol over several ports, until one is successful.
731 *
732 * may be called more than once ?
733 *
734 */
735
736 static void
pnp_identify(driver_t * driver,device_t parent)737 pnp_identify(driver_t *driver, device_t parent)
738 {
739 int num_pnp_devs;
740
741 /* Try various READ_DATA ports from 0x203-0x3ff */
742 for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
743 if (bootverbose)
744 printf("pnp_identify: Trying Read_Port at %x\n",
745 (pnp_rd_port << 2) | 0x3);
746
747 num_pnp_devs = pnp_isolation_protocol(parent);
748 if (num_pnp_devs)
749 break;
750 }
751 if (bootverbose)
752 printf("PNP Identify complete\n");
753 }
754
755 static device_method_t pnp_methods[] = {
756 /* Device interface */
757 DEVMETHOD(device_identify, pnp_identify),
758
759 { 0, 0 }
760 };
761
762 static driver_t pnp_driver = {
763 "pnp",
764 pnp_methods,
765 1, /* no softc */
766 };
767
768 static devclass_t pnp_devclass;
769
770 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);
771