1/*
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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__FBSDID("$FreeBSD$");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/kernel.h>
37#include <sys/module.h>
38#include <sys/bus.h>
39#include <sys/endian.h>
40#include <sys/malloc.h>
41#include <isa/isavar.h>
42#include <isa/pnpreg.h>
43#include <isa/pnpvar.h>
44#include <machine/bus.h>
45
46typedef struct _pnp_id {
47	uint32_t vendor_id;
48	uint32_t serial;
49	u_char checksum;
50} pnp_id;
51
52struct pnp_set_config_arg {
53	int	csn;		/* Card number to configure */
54	int	ldn;		/* Logical device on card */
55};
56
57struct pnp_quirk {
58	uint32_t vendor_id;	/* Vendor of the card */
59	uint32_t logical_id;	/* ID of the device with quirk */
60	int	type;
61#define PNP_QUIRK_WRITE_REG	1 /* Need to write a pnp register  */
62#define PNP_QUIRK_EXTRA_IO	2 /* Has extra io ports  */
63	int	arg1;
64	int	arg2;
65};
66
67struct pnp_quirk pnp_quirks[] = {
68	/*
69	 * The Gravis UltraSound needs register 0xf2 to be set to 0xff
70	 * to enable power.
71	 * XXX need to know the logical device id.
72	 */
73	{ 0x0100561e /* GRV0001 */,	0,
74	  PNP_QUIRK_WRITE_REG,	0xf2,	 0xff },
75	/*
76	 * An emu8000 does not give us other than the first
77	 * port.
78	 */
79	{ 0x26008c0e /* SB16 */,	0x21008c0e,
80	  PNP_QUIRK_EXTRA_IO,	0x400,	 0x800 },
81	{ 0x42008c0e /* SB32(CTL0042) */,	0x21008c0e,
82	  PNP_QUIRK_EXTRA_IO,	0x400,	 0x800 },
83	{ 0x44008c0e /* SB32(CTL0044) */,	0x21008c0e,
84	  PNP_QUIRK_EXTRA_IO,	0x400,	 0x800 },
85	{ 0x49008c0e /* SB32(CTL0049) */,	0x21008c0e,
86	  PNP_QUIRK_EXTRA_IO,	0x400,	 0x800 },
87	{ 0xf1008c0e /* SB32(CTL00f1) */,	0x21008c0e,
88	  PNP_QUIRK_EXTRA_IO,	0x400,	 0x800 },
89	{ 0xc1008c0e /* SB64(CTL00c1) */,	0x22008c0e,
90	  PNP_QUIRK_EXTRA_IO,	0x400,	 0x800 },
91	{ 0xc5008c0e /* SB64(CTL00c5) */,	0x22008c0e,
92	  PNP_QUIRK_EXTRA_IO,	0x400,	 0x800 },
93	{ 0xe4008c0e /* SB64(CTL00e4) */,	0x22008c0e,
94	  PNP_QUIRK_EXTRA_IO,	0x400,	 0x800 },
95
96	{ 0 }
97};
98
99/* The READ_DATA port that we are using currently */
100static int pnp_rd_port;
101
102static void   pnp_send_initiation_key(void);
103static int    pnp_get_serial(pnp_id *p);
104static int    pnp_isolation_protocol(device_t parent);
105
106static void
107pnp_write(int d, u_char r)
108{
109	outb (_PNP_ADDRESS, d);
110	outb (_PNP_WRITE_DATA, r);
111}
112
113/*
114 * Send Initiation LFSR as described in "Plug and Play ISA Specification",
115 * Intel May 94.
116 */
117static void
118pnp_send_initiation_key()
119{
120	int cur, i;
121
122	/* Reset the LSFR */
123	outb(_PNP_ADDRESS, 0);
124	outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
125
126	cur = 0x6a;
127	outb(_PNP_ADDRESS, cur);
128
129	for (i = 1; i < 32; i++) {
130		cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
131		outb(_PNP_ADDRESS, cur);
132	}
133}
134
135
136/*
137 * Get the device's serial number.  Returns 1 if the serial is valid.
138 */
139static int
140pnp_get_serial(pnp_id *p)
141{
142	int i, bit, valid = 0, sum = 0x6a;
143	u_char *data = (u_char *)p;
144
145	bzero(data, sizeof(char) * 9);
146	outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
147	for (i = 0; i < 72; i++) {
148		bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
149		DELAY(250);	/* Delay 250 usec */
150
151		/* Can't Short Circuit the next evaluation, so 'and' is last */
152		bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
153		DELAY(250);	/* Delay 250 usec */
154
155		valid = valid || bit;
156		if (i < 64)
157			sum = (sum >> 1) |
158			  (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
159		data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
160	}
161
162	valid = valid && (data[8] == sum);
163
164	return (valid);
165}
166
167/*
168 * Fill's the buffer with resource info from the device.
169 * Returns the number of characters read.
170 */
171static int
172pnp_get_resource_info(u_char *buffer, int len)
173{
174	int i, j, count;
175	u_char temp;
176
177	count = 0;
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(10);
184		}
185		if (j == 100) {
186			printf("PnP device failed to report resource data\n");
187			return (count);
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		count++;
194	}
195	return (count);
196}
197
198/*
199 * This function is called after the bus has assigned resource
200 * locations for a logical device.
201 */
202static void
203pnp_set_config(void *arg, struct isa_config *config, int enable)
204{
205	int csn = ((struct pnp_set_config_arg *) arg)->csn;
206	int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
207	int i;
208
209	/*
210	 * First put all cards into Sleep state with the initiation
211	 * key, then put our card into Config state.
212	 */
213	pnp_send_initiation_key();
214	pnp_write(PNP_WAKE, csn);
215
216	/*
217	 * Select our logical device so that we can program it.
218	 */
219	pnp_write(PNP_SET_LDN, ldn);
220
221	/*
222	 * Constrain the number of resources we will try to program
223	 */
224	if (config->ic_nmem > ISA_PNP_NMEM) {
225		printf("too many ISA memory ranges (%d > %d)\n",
226		    config->ic_nmem, ISA_PNP_NMEM);
227		config->ic_nmem = ISA_PNP_NMEM;
228	}
229	if (config->ic_nport > ISA_PNP_NPORT) {
230		printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport,
231		    ISA_PNP_NPORT);
232		config->ic_nport = ISA_PNP_NPORT;
233	}
234	if (config->ic_nirq > ISA_PNP_NIRQ) {
235		printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq,
236		    ISA_PNP_NIRQ);
237		config->ic_nirq = ISA_PNP_NIRQ;
238	}
239	if (config->ic_ndrq > ISA_PNP_NDRQ) {
240		printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq,
241		    ISA_PNP_NDRQ);
242		config->ic_ndrq = ISA_PNP_NDRQ;
243	}
244
245	/*
246	 * Now program the resources.
247	 */
248	for (i = 0; i < config->ic_nmem; i++) {
249		uint32_t start;
250		uint32_t size;
251
252		/* XXX: should handle memory control register, 32 bit memory */
253		if (config->ic_mem[i].ir_size == 0) {
254			pnp_write(PNP_MEM_BASE_HIGH(i), 0);
255			pnp_write(PNP_MEM_BASE_LOW(i), 0);
256			pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
257			pnp_write(PNP_MEM_RANGE_LOW(i), 0);
258		} else {
259			start = config->ic_mem[i].ir_start;
260			size =  config->ic_mem[i].ir_size;
261			if (start & 0xff)
262				panic("pnp_set_config: bogus memory assignment");
263			pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
264			pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
265			pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
266			pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
267		}
268	}
269	for (; i < ISA_PNP_NMEM; i++) {
270		pnp_write(PNP_MEM_BASE_HIGH(i), 0);
271		pnp_write(PNP_MEM_BASE_LOW(i), 0);
272		pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
273		pnp_write(PNP_MEM_RANGE_LOW(i), 0);
274	}
275
276	for (i = 0; i < config->ic_nport; i++) {
277		uint32_t start;
278
279		if (config->ic_port[i].ir_size == 0) {
280			pnp_write(PNP_IO_BASE_HIGH(i), 0);
281			pnp_write(PNP_IO_BASE_LOW(i), 0);
282		} else {
283			start = config->ic_port[i].ir_start;
284			pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
285			pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
286		}
287	}
288	for (; i < ISA_PNP_NPORT; i++) {
289		pnp_write(PNP_IO_BASE_HIGH(i), 0);
290		pnp_write(PNP_IO_BASE_LOW(i), 0);
291	}
292
293	for (i = 0; i < config->ic_nirq; i++) {
294		int irq;
295
296		/* XXX: interrupt type */
297		if (config->ic_irqmask[i] == 0) {
298			pnp_write(PNP_IRQ_LEVEL(i), 0);
299			pnp_write(PNP_IRQ_TYPE(i), 2);
300		} else {
301			irq = ffs(config->ic_irqmask[i]) - 1;
302			pnp_write(PNP_IRQ_LEVEL(i), irq);
303			pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
304		}
305	}
306	for (; i < ISA_PNP_NIRQ; i++) {
307		/*
308		 * IRQ 0 is not a valid interrupt selection and
309		 * represents no interrupt selection.
310		 */
311		pnp_write(PNP_IRQ_LEVEL(i), 0);
312		pnp_write(PNP_IRQ_TYPE(i), 2);
313	}
314
315	for (i = 0; i < config->ic_ndrq; i++) {
316		int drq;
317
318		if (config->ic_drqmask[i] == 0) {
319			pnp_write(PNP_DMA_CHANNEL(i), 4);
320		} else {
321			drq = ffs(config->ic_drqmask[i]) - 1;
322			pnp_write(PNP_DMA_CHANNEL(i), drq);
323		}
324	}
325	for (; i < ISA_PNP_NDRQ; i++) {
326		/*
327		 * DMA channel 4, the cascade channel is used to
328		 * indicate no DMA channel is active.
329		 */
330		pnp_write(PNP_DMA_CHANNEL(i), 4);
331	}
332
333	pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
334
335	/*
336	 * Wake everyone up again, we are finished.
337	 */
338	pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
339}
340
341/*
342 * Process quirks for a logical device.. The card must be in Config state.
343 */
344void
345pnp_check_quirks(uint32_t vendor_id, uint32_t logical_id, int ldn,
346    struct isa_config *config)
347{
348	struct pnp_quirk *qp;
349
350	for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
351		if (qp->vendor_id == vendor_id
352		    && (qp->logical_id == 0 || qp->logical_id == logical_id)) {
353			switch (qp->type) {
354			case PNP_QUIRK_WRITE_REG:
355				pnp_write(PNP_SET_LDN, ldn);
356				pnp_write(qp->arg1, qp->arg2);
357				break;
358			case PNP_QUIRK_EXTRA_IO:
359				if (config == NULL)
360					break;
361				if (qp->arg1 != 0) {
362					config->ic_nport++;
363					config->ic_port[config->ic_nport - 1] = config->ic_port[0];
364					config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
365					config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
366				}
367				if (qp->arg2 != 0) {
368					config->ic_nport++;
369					config->ic_port[config->ic_nport - 1] = config->ic_port[0];
370					config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
371					config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
372				}
373				break;
374			}
375		}
376	}
377}
378
379/*
380 * Scan Resource Data for Logical Devices.
381 *
382 * This function exits as soon as it gets an error reading *ANY*
383 * Resource Data or it reaches the end of Resource Data.  In the first
384 * case the return value will be TRUE, FALSE otherwise.
385 */
386static int
387pnp_create_devices(device_t parent, pnp_id *p, int csn,
388    u_char *resources, int len)
389{
390	u_char tag, *resp, *resinfo, *startres = NULL;
391	int large_len, scanning = len, retval = FALSE;
392	uint32_t logical_id;
393	device_t dev = 0;
394	int ldn = 0;
395	struct pnp_set_config_arg *csnldn;
396	char buf[100];
397	char *desc = NULL;
398
399	resp = resources;
400	while (scanning > 0) {
401		tag = *resp++;
402		scanning--;
403		if (PNP_RES_TYPE(tag) != 0) {
404			/* Large resource */
405			if (scanning < 2) {
406				scanning = 0;
407				continue;
408			}
409			large_len = resp[0] + (resp[1] << 8);
410			resp += 2;
411
412			if (scanning < large_len) {
413				scanning = 0;
414				continue;
415			}
416			resinfo = resp;
417			resp += large_len;
418			scanning -= large_len;
419
420			if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
421				if (dev) {
422					/*
423					 * This is an optional device
424					 * identifier string. Skip it
425					 * for now.
426					 */
427					continue;
428				}
429				/* else mandately card identifier string */
430				if (large_len > sizeof(buf) - 1)
431					large_len = sizeof(buf) - 1;
432				bcopy(resinfo, buf, large_len);
433
434				/*
435				 * Trim trailing spaces.
436				 */
437				while (buf[large_len-1] == ' ')
438					large_len--;
439				buf[large_len] = '\0';
440				desc = buf;
441				continue;
442			}
443
444			continue;
445		}
446
447		/* Small resource */
448		if (scanning < PNP_SRES_LEN(tag)) {
449			scanning = 0;
450			continue;
451		}
452		resinfo = resp;
453		resp += PNP_SRES_LEN(tag);
454		scanning -= PNP_SRES_LEN(tag);
455
456		switch (PNP_SRES_NUM(tag)) {
457		case PNP_TAG_LOGICAL_DEVICE:
458			/*
459			 * Parse the resources for the previous
460			 * logical device (if any).
461			 */
462			if (startres) {
463				pnp_parse_resources(dev, startres,
464				    resinfo - startres - 1, ldn);
465				dev = 0;
466				startres = NULL;
467			}
468
469			/*
470			 * A new logical device. Scan for end of
471			 * resources.
472			 */
473			bcopy(resinfo, &logical_id, 4);
474			pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
475			dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
476			if (desc)
477				device_set_desc_copy(dev, desc);
478			else
479				device_set_desc_copy(dev,
480				    pnp_eisaformat(logical_id));
481			isa_set_vendorid(dev, p->vendor_id);
482			isa_set_serial(dev, p->serial);
483			isa_set_logicalid(dev, logical_id);
484			isa_set_configattr(dev,
485			    ISACFGATTR_CANDISABLE | ISACFGATTR_DYNAMIC);
486			csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT);
487			if (!csnldn) {
488				device_printf(parent, "out of memory\n");
489				scanning = 0;
490				break;
491			}
492			csnldn->csn = csn;
493			csnldn->ldn = ldn;
494			ISA_SET_CONFIG_CALLBACK(parent, dev, pnp_set_config,
495			    csnldn);
496			isa_set_pnp_csn(dev, csn);
497			isa_set_pnp_ldn(dev, ldn);
498			ldn++;
499			startres = resp;
500			break;
501
502		case PNP_TAG_END:
503			if (!startres) {
504				device_printf(parent, "malformed resources\n");
505				scanning = 0;
506				break;
507			}
508			pnp_parse_resources(dev, startres,
509			    resinfo - startres - 1, ldn);
510			dev = 0;
511			startres = NULL;
512			scanning = 0;
513			break;
514
515		default:
516			/* Skip this resource */
517			break;
518		}
519	}
520
521	return (retval);
522}
523
524/*
525 * Read 'amount' bytes of resources from the card, allocating memory
526 * as needed. If a buffer is already available, it should be passed in
527 * '*resourcesp' and its length in '*spacep'. The number of resource
528 * bytes already in the buffer should be passed in '*lenp'. The memory
529 * allocated will be returned in '*resourcesp' with its size and the
530 * number of bytes of resources in '*spacep' and '*lenp' respectively.
531 *
532 * XXX: Multiple problems here, we forget to free() stuff in one
533 * XXX: error return, and in another case we free (*resourcesp) but
534 * XXX: don't tell the caller.
535 */
536static int
537pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
538{
539	u_char *resources = *resourcesp;
540	u_char *newres;
541	int space = *spacep;
542	int len = *lenp;
543
544	if (space == 0) {
545		space = 1024;
546		resources = malloc(space, M_TEMP, M_NOWAIT);
547		if (!resources)
548			return (ENOMEM);
549	}
550
551	if (len + amount > space) {
552		int extra = 1024;
553		while (len + amount > space + extra)
554			extra += 1024;
555		newres = malloc(space + extra, M_TEMP, M_NOWAIT);
556		if (!newres) {
557			/* XXX: free resources */
558			return (ENOMEM);
559		}
560		bcopy(resources, newres, len);
561		free(resources, M_TEMP);
562		resources = newres;
563		space += extra;
564	}
565
566	if (pnp_get_resource_info(resources + len, amount) != amount)
567		return (EINVAL);
568	len += amount;
569
570	*resourcesp = resources;
571	*spacep = space;
572	*lenp = len;
573
574	return (0);
575}
576
577/*
578 * Read all resources from the card, allocating memory as needed. If a
579 * buffer is already available, it should be passed in '*resourcesp'
580 * and its length in '*spacep'. The memory allocated will be returned
581 * in '*resourcesp' with its size and the number of bytes of resources
582 * in '*spacep' and '*lenp' respectively.
583 */
584static int
585pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
586{
587	u_char *resources = *resourcesp;
588	int space = *spacep;
589	int len = 0;
590	int error, done;
591	u_char tag;
592
593	error = 0;
594	done = 0;
595	while (!done) {
596		error = pnp_read_bytes(1, &resources, &space, &len);
597		if (error)
598			goto out;
599		tag = resources[len-1];
600		if (PNP_RES_TYPE(tag) == 0) {
601			/*
602			 * Small resource, read contents.
603			 */
604			error = pnp_read_bytes(PNP_SRES_LEN(tag),
605			    &resources, &space, &len);
606			if (error)
607				goto out;
608			if (PNP_SRES_NUM(tag) == PNP_TAG_END)
609				done = 1;
610		} else {
611			/*
612			 * Large resource, read length and contents.
613			 */
614			error = pnp_read_bytes(2, &resources, &space, &len);
615			if (error)
616				goto out;
617			error = pnp_read_bytes(resources[len-2]
618			    + (resources[len-1] << 8), &resources, &space,
619			    &len);
620			if (error)
621				goto out;
622		}
623	}
624
625 out:
626	*resourcesp = resources;
627	*spacep = space;
628	*lenp = len;
629	return (error);
630}
631
632/*
633 * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
634 * value (caller should try multiple READ_DATA locations before giving
635 * up). Upon exiting, all cards are aware that they should use
636 * pnp_rd_port as the READ_DATA port.
637 *
638 * In the first pass, a csn is assigned to each board and pnp_id's
639 * are saved to an array, pnp_devices. In the second pass, each
640 * card is woken up and the device configuration is called.
641 */
642static int
643pnp_isolation_protocol(device_t parent)
644{
645	int csn;
646	pnp_id id;
647	int found = 0, len;
648	u_char *resources = NULL;
649	int space = 0;
650	int error;
651
652	/*
653	 * Put all cards into the Sleep state so that we can clear
654	 * their CSNs.
655	 */
656	pnp_send_initiation_key();
657
658	/*
659	 * Clear the CSN for all cards.
660	 */
661	pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
662
663	/*
664	 * Move all cards to the Isolation state.
665	 */
666	pnp_write(PNP_WAKE, 0);
667
668	/*
669	 * Tell them where the read point is going to be this time.
670	 */
671	pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
672
673	for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
674		/*
675		 * Start the serial isolation protocol.
676		 */
677		outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
678		DELAY(1000);	/* Delay 1 msec */
679
680		if (pnp_get_serial(&id)) {
681			/*
682			 * We have read the id from a card
683			 * successfully. The card which won the
684			 * isolation protocol will be in Isolation
685			 * mode and all others will be in Sleep.
686			 * Program the CSN of the isolated card
687			 * (taking it to Config state) and read its
688			 * resources, creating devices as we find
689			 * logical devices on the card.
690			 */
691			pnp_write(PNP_SET_CSN, csn);
692			if (bootverbose)
693				printf("Reading PnP configuration for %s.\n",
694				    pnp_eisaformat(id.vendor_id));
695			error = pnp_read_resources(&resources, &space, &len);
696			if (error)
697				break;
698			pnp_create_devices(parent, &id, csn, resources, len);
699			found++;
700		} else
701			break;
702
703		/*
704		 * Put this card back to the Sleep state and
705		 * simultaneously move all cards which don't have a
706		 * CSN yet to Isolation state.
707		 */
708		pnp_write(PNP_WAKE, 0);
709	}
710
711	/*
712	 * Unless we have chosen the wrong read port, all cards will
713	 * be in Sleep state. Put them back into WaitForKey for
714	 * now. Their resources will be programmed later.
715	 */
716	pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
717
718	/*
719	 * Cleanup.
720	 */
721	if (resources)
722		free(resources, M_TEMP);
723
724	return (found);
725}
726
727
728/*
729 * pnp_identify()
730 *
731 * autoconfiguration of pnp devices. This routine just runs the
732 * isolation protocol over several ports, until one is successful.
733 *
734 * may be called more than once ?
735 *
736 */
737
738static void
739pnp_identify(driver_t *driver, device_t parent)
740{
741	int num_pnp_devs;
742
743	/* Try various READ_DATA ports from 0x203-0x3ff */
744	for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
745		if (bootverbose)
746			printf("pnp_identify: Trying Read_Port at %x\n",
747			    (pnp_rd_port << 2) | 0x3);
748
749		num_pnp_devs = pnp_isolation_protocol(parent);
750		if (num_pnp_devs)
751			break;
752	}
753	if (bootverbose)
754		printf("PNP Identify complete\n");
755}
756
757static device_method_t pnp_methods[] = {
758	/* Device interface */
759	DEVMETHOD(device_identify,	pnp_identify),
760
761	{ 0, 0 }
762};
763
764static driver_t pnp_driver = {
765	"pnp",
766	pnp_methods,
767	1,			/* no softc */
768};
769
770static devclass_t pnp_devclass;
771
772DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);
773