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pci_subr.c revision 1.9 
      1 /*	$NetBSD: pci_subr.c,v 1.9 1995/06/17 22:40:34 cgd 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 <dev/pci/pcivar.h>
     41 #include <dev/pci/pcireg.h>
     42 
     43 int
     44 pciprint(aux, pci)
     45 	void *aux;
     46 	char *pci;
     47 {
     48 	register struct pci_attach_args *pa = aux;
     49 
     50 	printf(" bus %d device %d", pa->pa_bus, pa->pa_device);
     51 	return (UNCONF);
     52 }
     53 
     54 int
     55 pcisubmatch(parent, match, aux)
     56 	struct device *parent;
     57 	void *match, *aux;
     58 {
     59 	struct cfdata *cf = match;
     60 	struct pci_attach_args *pa = aux;
     61 
     62 	if (cf->cf_loc[0] != -1 && cf->cf_loc[0] != pa->pa_bus)
     63 		return 0;
     64 	if (cf->cf_loc[1] != -1 && cf->cf_loc[1] != pa->pa_device)
     65 		return 0;
     66 	return ((*cf->cf_driver->cd_match)(parent, match, aux));
     67 }
     68 
     69 /*
     70  * Try to find and attach the PCI device at the give bus and device number.
     71  * Return 1 if successful, 0 if unsuccessful.
     72  */
     73 int
     74 pci_attach_subdev(pcidev, bus, device)
     75         struct device *pcidev;
     76         int bus, device;
     77 {
     78 	pcitag_t tag;
     79 	pcireg_t id, class;
     80 	struct pci_attach_args pa;
     81 	struct cfdata *cf;
     82 
     83 	tag = pci_make_tag(bus, device, 0);
     84 	id = pci_conf_read(tag, PCI_ID_REG);
     85 	if (id == 0 || id == 0xffffffff)
     86 		return (0);
     87 	class = pci_conf_read(tag, PCI_CLASS_REG);
     88 
     89 	pa.pa_bus = bus;
     90 	pa.pa_device = device;
     91 	pa.pa_tag = tag;
     92 	pa.pa_id = id;
     93 	pa.pa_class = class;
     94 
     95 	if ((cf = config_search(pcisubmatch, pcidev, &pa)) != NULL)
     96 		config_attach(pcidev, cf, &pa, pciprint);
     97 	else {
     98 		printf("%s bus %d device %d: identifier %08x class %08x%s",
     99 		    pcidev->dv_xname, bus, device, id, class,
    100 		    " not configured\n");
    101 		return (0);
    102 	}
    103 
    104 	return (1);
    105 }
    106