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      1 /*	$NetBSD: pci_bus.c,v 1.2 2003/03/08 09:53:45 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright 2001 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * Interface to PCI config space registers for a PCI domain.
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 __RCSID("$NetBSD: pci_bus.c,v 1.2 2003/03/08 09:53:45 lukem Exp $");
     44 
     45 #include <sys/types.h>
     46 #include <sys/ioctl.h>
     47 
     48 #include <pci.h>
     49 
     50 #include <dev/pci/pciio.h>
     51 
     52 /*
     53  * pcibus_conf_read:
     54  *
     55  *	Read a config word for a given bus/device/function.
     56  */
     57 int
     58 pcibus_conf_read(int fd, u_int bus, u_int device, u_int func, u_int reg,
     59     uint32_t *valp)
     60 {
     61 	struct pciio_bdf_cfgreg bdfr;
     62 	int rv;
     63 
     64 	bdfr.bus = bus;
     65 	bdfr.device = device;
     66 	bdfr.function = func;
     67 	bdfr.cfgreg.reg = reg;
     68 
     69 	rv = ioctl(fd, PCI_IOC_BDF_CFGREAD, &bdfr);
     70 	if (rv == -1) {
     71 		/* errno already set. */
     72 		return (-1);
     73 	}
     74 
     75 	*valp = bdfr.cfgreg.val;
     76 	return (0);
     77 }
     78 
     79 /*
     80  * pcibus_conf_write:
     81  *
     82  *	Write a config word for a given bus/device/function.
     83  */
     84 int
     85 pcibus_conf_write(int fd, u_int bus, u_int device, u_int func, u_int reg,
     86     uint32_t val)
     87 {
     88 	struct pciio_bdf_cfgreg bdfr;
     89 
     90 	bdfr.bus = bus;
     91 	bdfr.device = device;
     92 	bdfr.function = func;
     93 	bdfr.cfgreg.reg = reg;
     94 	bdfr.cfgreg.val = val;
     95 
     96 	return (ioctl(fd, PCI_IOC_BDF_CFGWRITE, &bdfr));
     97 }
     98