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pci.c revision 1.6 
      1 /*	$NetBSD: pci.c,v 1.6 1994/11/04 09:42:22 mycroft Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994 Charles Hannum.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by Charles Hannum.
     17  * 4. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * PCI autoconfiguration support
     34  */
     35 
     36 #include <sys/types.h>
     37 #include <sys/param.h>
     38 #include <sys/device.h>
     39 
     40 #include <i386/pci/pcivar.h>
     41 #include <i386/pci/pcireg.h>
     42 
     43 int pcimatch __P((struct device *, void *, void *));
     44 void pciattach __P((struct device *, struct device *, void *));
     45 
     46 struct cfdriver pcicd = {
     47 	NULL, "pci", pcimatch, pciattach, DV_DULL, sizeof(struct device)
     48 };
     49 
     50 int
     51 pciprint(aux, pci)
     52 	void *aux;
     53 	char *pci;
     54 {
     55 	register struct pci_attach_args *pa = aux;
     56 
     57 	printf(" bus %d device %d", pa->pa_bus, pa->pa_device);
     58 	return (UNCONF);
     59 }
     60 
     61 int
     62 pcisubmatch(parent, match, aux)
     63 	struct device *parent;
     64 	void *match, *aux;
     65 {
     66 	struct cfdata *cf = match;
     67 	struct pci_attach_args *pa = aux;
     68 
     69 	if (cf->cf_loc[0] != -1 && cf->cf_loc[0] != pa->pa_bus)
     70 		return 0;
     71 	if (cf->cf_loc[1] != -1 && cf->cf_loc[1] != pa->pa_device)
     72 		return 0;
     73 	return ((*cf->cf_driver->cd_match)(parent, match, aux));
     74 }
     75 
     76 void
     77 pciattach(parent, self, aux)
     78 	struct device *parent, *self;
     79 	void *aux;
     80 {
     81 	int bus, device;
     82 
     83 #ifdef i386
     84 	printf(": configuration mode %d\n", pci_mode);
     85 #else
     86 	printf("\n");
     87 #endif
     88 
     89 #if 0
     90 	for (bus = 0; bus <= 255; bus++) {
     91 #else
     92 	/*
     93 	 * XXX
     94 	 * Some current chipsets do wacky things with bus numbers > 0.
     95 	 * This seems like a violation of protocol, but the PCI BIOS does
     96 	 * allow one to query the maximum bus number, and eventually we
     97 	 * should do so.
     98 	 */
     99 	for (bus = 0; bus <= 0; bus++) {
    100 #endif
    101 #ifdef i386
    102 		for (device = 0; device <= (pci_mode == 2 ? 15 : 31);
    103 		    device++) {
    104 #else
    105 		for (device = 0; device <= 31; device++) {
    106 #endif
    107 			pcitag_t tag = pci_make_tag(bus, device, 0);
    108 			pcireg_t id = pci_conf_read(tag, PCI_ID_REG),
    109 				 class = pci_conf_read(tag, PCI_CLASS_REG);
    110 			struct pci_attach_args pa;
    111 			struct cfdata *cf;
    112 
    113 			if (id == 0 || id == 0xffffffff)
    114 				continue;
    115 
    116 			pa.pa_bus = bus;
    117 			pa.pa_device = device;
    118 			pa.pa_tag = tag;
    119 			pa.pa_id = id;
    120 			pa.pa_class = class;
    121 
    122 			if ((cf = config_search(pcisubmatch, self, &pa)) != NULL)
    123 				config_attach(self, cf, &pa, pciprint);
    124 			else
    125 				printf("%s bus %d device %d: identifier %08x class %08x%s",
    126 				    self->dv_xname, bus, device, id, class,
    127 				    " not configured\n");
    128 		}
    129 	}
    130 }
    131