pnp.c revision 51346 
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: head/sys/isa/pnp.c 51346 1999-09-17 08:18:34Z dfr $
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 <isa/isavar.h>
37#include <isa/pnpreg.h>
38#include <isa/pnpvar.h>
39#include <machine/resource.h>
40#include <machine/clock.h>
41
42typedef struct _pnp_id {
43	u_int32_t vendor_id;
44	u_int32_t serial;
45	u_char checksum;
46} pnp_id;
47
48struct pnp_set_config_arg {
49	int	csn;		/* Card number to configure */
50	int	ldn;		/* Logical device on card */
51};
52
53struct pnp_quirk {
54	u_int32_t vendor_id;	/* Vendor of the card */
55	u_int32_t logical_id;	/* ID of the device with quirk */
56	int	type;
57#define PNP_QUIRK_WRITE_REG	1 /* Need to write a pnp register  */
58	int	arg1;
59	int	arg2;
60};
61
62struct pnp_quirk pnp_quirks[] = {
63	/*
64	 * The Gravis UltraSound needs register 0xf2 to be set to 0xff
65	 * to enable power.
66	 * XXX need to know the logical device id.
67	 */
68	{ 0x0100561e /* GRV0001 */,	0,
69	  PNP_QUIRK_WRITE_REG,	0xf2,	 0xff },
70
71	{ 0 }
72};
73
74#if 0
75/*
76 * these entries are initialized using the autoconfig menu
77 * The struct is invalid (and must be initialized) if the first
78 * CSN is zero. The init code fills invalid entries with CSN 255
79 * which is not a supported value.
80 */
81
82struct pnp_cinfo pnp_ldn_overrides[MAX_PNP_LDN] = {
83    { 0 }
84};
85#endif
86
87/* The READ_DATA port that we are using currently */
88static int pnp_rd_port;
89
90static void   pnp_send_initiation_key(void);
91static int    pnp_get_serial(pnp_id *p);
92static int    pnp_isolation_protocol(device_t parent);
93
94static void
95pnp_write(int d, u_char r)
96{
97	outb (_PNP_ADDRESS, d);
98	outb (_PNP_WRITE_DATA, r);
99}
100
101#if 0
102
103static u_char
104pnp_read(int d)
105{
106	outb (_PNP_ADDRESS, d);
107	return (inb(3 | (pnp_rd_port <<2)));
108}
109
110#endif
111
112/*
113 * Send Initiation LFSR as described in "Plug and Play ISA Specification",
114 * Intel May 94.
115 */
116static void
117pnp_send_initiation_key()
118{
119	int cur, i;
120
121	/* Reset the LSFR */
122	outb(_PNP_ADDRESS, 0);
123	outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
124
125	cur = 0x6a;
126	outb(_PNP_ADDRESS, cur);
127
128	for (i = 1; i < 32; i++) {
129		cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
130		outb(_PNP_ADDRESS, cur);
131	}
132}
133
134
135/*
136 * Get the device's serial number.  Returns 1 if the serial is valid.
137 */
138static int
139pnp_get_serial(pnp_id *p)
140{
141	int i, bit, valid = 0, sum = 0x6a;
142	u_char *data = (u_char *)p;
143
144	bzero(data, sizeof(char) * 9);
145	outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
146	for (i = 0; i < 72; i++) {
147		bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
148		DELAY(250);	/* Delay 250 usec */
149
150		/* Can't Short Circuit the next evaluation, so 'and' is last */
151		bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
152		DELAY(250);	/* Delay 250 usec */
153
154		valid = valid || bit;
155
156		if (i < 64)
157			sum = (sum >> 1) |
158				(((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
159
160		data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
161	}
162
163	valid = valid && (data[8] == sum);
164
165	return valid;
166}
167
168/*
169 * Fill's the buffer with resource info from the device.
170 * Returns 0 if the device fails to report
171 */
172static int
173pnp_get_resource_info(u_char *buffer, int len)
174{
175	int i, j;
176	u_char temp;
177
178	for (i = 0; i < len; i++) {
179		outb(_PNP_ADDRESS, PNP_STATUS);
180		for (j = 0; j < 100; j++) {
181			if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
182				break;
183			DELAY(1);
184		}
185		if (j == 100) {
186			printf("PnP device failed to report resource data\n");
187			return 0;
188		}
189		outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
190		temp = inb((pnp_rd_port << 2) | 0x3);
191		if (buffer != NULL)
192			buffer[i] = temp;
193	}
194	return 1;
195}
196
197#if 0
198/*
199 * write_pnp_parms initializes a logical device with the parms
200 * in d, and then activates the board if the last parameter is 1.
201 */
202
203static int
204write_pnp_parms(struct pnp_cinfo *d, pnp_id *p, int ldn)
205{
206    int i, empty = -1 ;
207
208    pnp_write (SET_LDN, ldn );
209    i = pnp_read(SET_LDN) ;
210    if (i != ldn) {
211	printf("Warning: LDN %d does not exist\n", ldn);
212    }
213    for (i = 0; i < 8; i++) {
214	pnp_write(IO_CONFIG_BASE + i * 2, d->ic_port[i] >> 8 );
215	pnp_write(IO_CONFIG_BASE + i * 2 + 1, d->ic_port[i] & 0xff );
216    }
217    for (i = 0; i < 4; i++) {
218	pnp_write(MEM_CONFIG + i*8, (d->ic_mem[i].base >> 16) & 0xff );
219	pnp_write(MEM_CONFIG + i*8+1, (d->ic_mem[i].base >> 8) & 0xff );
220	pnp_write(MEM_CONFIG + i*8+2, d->ic_mem[i].control & 0xff );
221	pnp_write(MEM_CONFIG + i*8+3, (d->ic_mem[i].range >> 16) & 0xff );
222	pnp_write(MEM_CONFIG + i*8+4, (d->ic_mem[i].range >> 8) & 0xff );
223    }
224    for (i = 0; i < 2; i++) {
225	pnp_write(IRQ_CONFIG + i*2    , d->irq[i] );
226	pnp_write(IRQ_CONFIG + i*2 + 1, d->irq_type[i] );
227	pnp_write(DRQ_CONFIG + i, d->drq[i] );
228    }
229    /*
230     * store parameters read into the current kernel
231     * so manual editing next time is easier
232     */
233    for (i = 0 ; i < MAX_PNP_LDN; i++) {
234	if (pnp_ldn_overrides[i].csn == d->csn &&
235		pnp_ldn_overrides[i].ldn == ldn) {
236	    d->flags = pnp_ldn_overrides[i].flags ;
237	    pnp_ldn_overrides[i] = *d ;
238	    break ;
239	} else if (pnp_ldn_overrides[i].csn < 1 ||
240		pnp_ldn_overrides[i].csn == 255)
241	    empty = i ;
242    }
243    if (i== MAX_PNP_LDN && empty != -1)
244	pnp_ldn_overrides[empty] = *d;
245
246    /*
247     * Here should really perform the range check, and
248     * return a failure if not successful.
249     */
250    pnp_write (IO_RANGE_CHECK, 0);
251    DELAY(1000); /* XXX is it really necessary ? */
252    pnp_write (ACTIVATE, d->enable ? 1 : 0);
253    DELAY(1000); /* XXX is it really necessary ? */
254    return 1 ;
255}
256#endif
257
258/*
259 * This function is called after the bus has assigned resource
260 * locations for a logical device.
261 */
262static void
263pnp_set_config(void *arg, struct isa_config *config, int enable)
264{
265	int csn = ((struct pnp_set_config_arg *) arg)->csn;
266	int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
267	int i;
268
269	/*
270	 * First put all cards into Sleep state with the initiation
271	 * key, then put our card into Config state.
272	 */
273	pnp_send_initiation_key();
274	pnp_write(PNP_WAKE, csn);
275
276	/*
277	 * Select our logical device so that we can program it.
278	 */
279	pnp_write(PNP_SET_LDN, ldn);
280
281	/*
282	 * Now program the resources.
283	 */
284	for (i = 0; i < config->ic_nmem; i++) {
285		u_int32_t start = config->ic_mem[i].ir_start;
286		u_int32_t size =  config->ic_mem[i].ir_size;
287		if (start & 0xff)
288			panic("pnp_set_config: bogus memory assignment");
289		pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
290		pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
291		pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
292		pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
293	}
294	for (; i < ISA_NMEM; i++) {
295		pnp_write(PNP_MEM_BASE_HIGH(i), 0);
296		pnp_write(PNP_MEM_BASE_LOW(i), 0);
297		pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
298		pnp_write(PNP_MEM_RANGE_LOW(i), 0);
299	}
300
301	for (i = 0; i < config->ic_nport; i++) {
302		u_int32_t start = config->ic_port[i].ir_start;
303		pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
304		pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
305	}
306	for (; i < ISA_NPORT; i++) {
307		pnp_write(PNP_IO_BASE_HIGH(i), 0);
308		pnp_write(PNP_IO_BASE_LOW(i), 0);
309	}
310
311	for (i = 0; i < config->ic_nirq; i++) {
312		int irq = ffs(config->ic_irqmask[i]) - 1;
313		pnp_write(PNP_IRQ_LEVEL(i), irq);
314		pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
315	}
316	for (; i < ISA_NIRQ; i++) {
317		/*
318		 * IRQ 0 is not a valid interrupt selection and
319		 * represents no interrupt selection.
320		 */
321		pnp_write(PNP_IRQ_LEVEL(i), 0);
322	}
323
324	for (i = 0; i < config->ic_ndrq; i++) {
325		int drq = ffs(config->ic_drqmask[i]) - 1;
326		pnp_write(PNP_DMA_CHANNEL(i), drq);
327	}
328	for (; i < ISA_NDRQ; i++) {
329		/*
330		 * DMA channel 4, the cascade channel is used to
331		 * indicate no DMA channel is active.
332		 */
333		pnp_write(PNP_DMA_CHANNEL(i), 4);
334	}
335
336	pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
337
338	/*
339	 * Wake everyone up again, we are finished.
340	 */
341	pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
342}
343
344/*
345 * Process quirks for a logical device.. The card must be in Config state.
346 */
347static void
348pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, int ldn)
349{
350	struct pnp_quirk *qp;
351
352	for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
353		if (qp->vendor_id == vendor_id
354		    && (qp->logical_id == 0
355			|| qp->logical_id == logical_id)) {
356			switch (qp->type) {
357			case PNP_QUIRK_WRITE_REG:
358				pnp_write(PNP_SET_LDN, ldn);
359				pnp_write(qp->arg1, qp->arg2);
360				break;
361			}
362		}
363	}
364}
365
366/*
367 * Scan Resource Data for Logical Devices.
368 *
369 * This function exits as soon as it gets an error reading *ANY*
370 * Resource Data or ir reaches the end of Resource Data.  In the first
371 * case the return value will be TRUE, FALSE otherwise.
372 */
373static int
374pnp_scan_resdata(device_t parent, pnp_id *p, int csn)
375{
376	u_char tag, resinfo[16];
377	int large_len, scanning = 1024, retval = FALSE;
378	u_int32_t logical_id;
379	u_int32_t compat_id;
380	device_t dev = 0;
381	int ldn = 0;
382	struct isa_config card, logdev, alt;
383	struct isa_config *config;
384	struct pnp_set_config_arg *csnldn;
385	int priority = 0;
386	int seenalt = 0;
387	char *desc = 0;
388
389	bzero(&card, sizeof card);
390	bzero(&logdev, sizeof logdev);
391	bzero(&alt, sizeof alt);
392	config = &card;
393	while (scanning-- > 0 && pnp_get_resource_info(&tag, 1)) {
394		if (PNP_RES_TYPE(tag) == 0) {
395			/* Small resource */
396			if (pnp_get_resource_info(resinfo,
397						  PNP_SRES_LEN(tag)) == 0) {
398				scanning = 0;
399				continue;
400			}
401
402			switch (PNP_SRES_NUM(tag)) {
403			case PNP_TAG_LOGICAL_DEVICE:
404				/*
405				 * A new logical device. Scan
406				 * resourcea and add device.
407				 */
408				bcopy(resinfo, &logical_id, 4);
409				pnp_check_quirks(p->vendor_id,
410						 logical_id,
411						 ldn);
412				compat_id = 0;
413				logdev = card;
414				config = &logdev;
415				dev = BUS_ADD_CHILD(parent,
416						    ISA_ORDER_PNP, NULL, -1);
417				if (desc)
418					device_set_desc_copy(dev, desc);
419				isa_set_vendorid(dev, p->vendor_id);
420				isa_set_serial(dev, p->serial);
421				isa_set_logicalid(dev, logical_id);
422				csnldn = malloc(sizeof *csnldn,
423						M_DEVBUF, M_NOWAIT);
424				if (!csnldn) {
425					device_printf(parent,
426						      "out of memory\n");
427					scanning = 0;
428					break;
429				}
430				csnldn->csn = csn;
431				csnldn->ldn = ldn;
432				ISA_SET_CONFIG_CALLBACK(parent, dev,
433							pnp_set_config,
434							csnldn);
435				seenalt = 0;
436				ldn++;
437				break;
438
439			case PNP_TAG_COMPAT_DEVICE:
440				/*
441				 * Got a compatible device id
442				 * resource. Should keep a list of
443				 * compat ids in the device.
444				 */
445				bcopy(resinfo, &compat_id, 4);
446				if (dev)
447					isa_set_compatid(dev, compat_id);
448				break;
449
450			case PNP_TAG_IRQ_FORMAT:
451				if (config->ic_nirq == ISA_NIRQ) {
452					device_printf(parent,
453						      "CSN %d too many irqs",
454						      csn);
455					scanning = 0;
456					break;
457				}
458				config->ic_irqmask[config->ic_nirq] =
459					resinfo[0] + (resinfo[1]<<8);
460				config->ic_nirq++;
461				break;
462
463			case PNP_TAG_DMA_FORMAT:
464				if (config->ic_ndrq == ISA_NDRQ) {
465					device_printf(parent,
466						      "CSN %d too many drqs",
467						      csn);
468					scanning = 0;
469					break;
470				}
471				config->ic_drqmask[config->ic_ndrq] =
472					resinfo[0];
473				config->ic_ndrq++;
474				break;
475
476			case PNP_TAG_START_DEPENDANT:
477				if (config == &alt) {
478					ISA_ADD_CONFIG(parent, dev,
479						       priority, config);
480				} else if (config != &logdev) {
481					device_printf(parent,
482						      "CSN %d malformed\n",
483						      csn);
484					scanning = 0;
485					break;
486				}
487				/*
488				 * If the priority is not specified,
489				 * then use the default of
490				 * 'acceptable'
491				 */
492				if (PNP_SRES_LEN(tag) > 0)
493					priority = resinfo[0];
494				else
495					priority = 1;
496				alt = logdev;
497				config = &alt;
498				break;
499
500			case PNP_TAG_END_DEPENDANT:
501				ISA_ADD_CONFIG(parent, dev, priority, config);
502				config = &logdev;
503				seenalt = 1;
504				break;
505
506			case PNP_TAG_IO_RANGE:
507				if (config->ic_nport == ISA_NPORT) {
508					device_printf(parent,
509						      "CSN %d too many ports",
510						      csn);
511					scanning = 0;
512					break;
513				}
514				config->ic_port[config->ic_nport].ir_start =
515					resinfo[1] + (resinfo[2]<<8);
516				config->ic_port[config->ic_nport].ir_end =
517					resinfo[3] + (resinfo[4]<<8)
518					+ resinfo[6] - 1;
519				config->ic_port[config->ic_nport].ir_size
520					=
521					resinfo[6];
522				config->ic_port[config->ic_nport].ir_align =
523					resinfo[5];
524				config->ic_nport++;
525				break;
526
527			case PNP_TAG_IO_FIXED:
528				if (config->ic_nport == ISA_NPORT) {
529					device_printf(parent,
530						      "CSN %d too many ports",
531						      csn);
532					scanning = 0;
533					break;
534				}
535				config->ic_port[config->ic_nport].ir_start =
536					resinfo[0] + (resinfo[1]<<8);
537				config->ic_port[config->ic_nport].ir_end =
538					resinfo[0] + (resinfo[1]<<8)
539					+ resinfo[2] - 1;
540				config->ic_port[config->ic_nport].ir_size
541					= resinfo[2];
542				config->ic_port[config->ic_nport].ir_align = 1;
543				config->ic_nport++;
544				break;
545
546			case PNP_TAG_END:
547				if (!seenalt)
548					ISA_ADD_CONFIG(parent, dev,
549						       priority, config);
550				scanning = 0;
551				break;
552
553			default:
554				/* Skip this resource */
555				break;
556			}
557		} else {
558			/* Large resource */
559			if (pnp_get_resource_info(resinfo, 2) == 0) {
560				scanning = 0;
561				continue;
562			}
563			large_len = resinfo[0] + (resinfo[1] << 8);
564
565			if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
566				if (desc)
567					free(desc, M_TEMP);
568				desc = malloc(large_len + 1,
569					      M_TEMP, M_NOWAIT);
570				/*
571				 * Note: if malloc fails, this will
572				 * skip the resource instead of
573				 * reading it into desc.
574				 */
575				if (pnp_get_resource_info(desc,
576							  large_len) == 0) {
577					scanning = 0;
578				}
579				if (desc) {
580					/*
581					 * Trim trailing spaces.
582					 */
583					while (desc[large_len-1] == ' ')
584						large_len--;
585					desc[large_len] = '\0';
586					if (dev)
587						device_set_desc_copy
588							(dev, desc);
589				}
590				continue;
591			}
592
593			if (PNP_LRES_NUM(tag) != PNP_TAG_MEMORY_RANGE) {
594				/* skip */
595				if (pnp_get_resource_info(NULL,
596							  large_len) == 0) {
597					scanning = 0;
598				}
599				continue;
600			}
601
602			if (pnp_get_resource_info(resinfo, large_len) == 0) {
603				scanning = 0;
604				continue;
605			}
606
607			if (config->ic_nmem == ISA_NMEM) {
608				device_printf(parent,
609					      "CSN %d too many memory ranges",
610					      csn);
611				scanning = 0;
612				break;
613			}
614
615			config->ic_mem[config->ic_nmem].ir_start =
616				(resinfo[4]<<8) + (resinfo[5]<<16);
617			config->ic_mem[config->ic_nmem].ir_end =
618				(resinfo[6]<<8) + (resinfo[7]<<16);
619			config->ic_mem[config->ic_nmem].ir_size =
620				(resinfo[10]<<8) + (resinfo[11]<<16);
621			config->ic_mem[config->ic_nmem].ir_align =
622				resinfo[8] + (resinfo[9]<<8);
623			if (!config->ic_mem[config->ic_nmem].ir_align)
624				config->ic_mem[config->ic_nmem].ir_align =
625					0x10000;
626			config->ic_nmem++;
627		}
628	}
629
630	if (desc)
631		free(desc, M_TEMP);
632
633	return retval;
634}
635
636/*
637 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
638 * value (caller should try multiple READ_DATA locations before giving
639 * up). Upon exiting, all cards are aware that they should use
640 * pnp_rd_port as the READ_DATA port.
641 *
642 * In the first pass, a csn is assigned to each board and pnp_id's
643 * are saved to an array, pnp_devices. In the second pass, each
644 * card is woken up and the device configuration is called.
645 */
646static int
647pnp_isolation_protocol(device_t parent)
648{
649	int csn;
650	pnp_id id;
651	int found = 0;
652
653	/*
654	 * Put all cards into the Sleep state so that we can clear
655	 * their CSNs.
656	 */
657	pnp_send_initiation_key();
658
659	/*
660	 * Clear the CSN for all cards.
661	 */
662	pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
663
664	/*
665	 * Move all cards to the Isolation state.
666	 */
667	pnp_write(PNP_WAKE, 0);
668
669	/*
670	 * Tell them where the read point is going to be this time.
671	 */
672	pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
673
674	for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
675		/*
676		 * Start the serial isolation protocol.
677		 */
678		outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
679		DELAY(1000);	/* Delay 1 msec */
680
681		if (pnp_get_serial(&id)) {
682			/*
683			 * We have read the id from a card
684			 * successfully. The card which won the
685			 * isolation protocol will be in Isolation
686			 * mode and all others will be in Sleep.  *
687			 * Program the CSN of the isolated card
688			 * (taking it to Config state) and read its
689			 * resources, creating devices as we find
690			 * logical devices on the card.
691			 */
692			pnp_write(PNP_SET_CSN, csn);
693			pnp_scan_resdata(parent, &id, csn);
694			found++;
695		} else
696			break;
697
698		/*
699		 * Put this card back to the Sleep state and
700		 * simultaneously move all cards which don't have a
701		 * CSN yet to Isolation state.
702		 */
703		pnp_write(PNP_WAKE, 0);
704	}
705
706	/*
707	 * Unless we have chosen the wrong read port, all cards will
708	 * be in Sleep state. Put them back into WaitForKey for
709	 * now. Their resources will be programmed later.
710	 */
711	pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
712
713	return found;
714}
715
716
717/*
718 * pnp_identify()
719 *
720 * autoconfiguration of pnp devices. This routine just runs the
721 * isolation protocol over several ports, until one is successful.
722 *
723 * may be called more than once ?
724 *
725 */
726
727static void
728pnp_identify(driver_t *driver, device_t parent)
729{
730	int num_pnp_devs;
731
732#if 0
733	if (pnp_ldn_overrides[0].csn == 0) {
734		if (bootverbose)
735			printf("Initializing PnP override table\n");
736		bzero (pnp_ldn_overrides, sizeof(pnp_ldn_overrides));
737		pnp_ldn_overrides[0].csn = 255 ;
738	}
739#endif
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("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3);
745
746		num_pnp_devs = pnp_isolation_protocol(parent);
747		if (num_pnp_devs)
748			break;
749	}
750}
751
752static device_method_t pnp_methods[] = {
753	/* Device interface */
754	DEVMETHOD(device_identify,	pnp_identify),
755
756	{ 0, 0 }
757};
758
759static driver_t pnp_driver = {
760	"pnp",
761	pnp_methods,
762	1,			/* no softc */
763};
764
765static devclass_t pnp_devclass;
766
767DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);
768