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pci_usrreq.c revision 1.13 
      1 /*	$NetBSD: pci_usrreq.c,v 1.13 2006/11/16 01:33:09 christos 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  * User -> kernel interface for PCI bus access.
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 __KERNEL_RCSID(0, "$NetBSD: pci_usrreq.c,v 1.13 2006/11/16 01:33:09 christos Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/conf.h>
     47 #include <sys/device.h>
     48 #include <sys/ioctl.h>
     49 #include <sys/proc.h>
     50 #include <sys/systm.h>
     51 #include <sys/errno.h>
     52 #include <sys/fcntl.h>
     53 
     54 #include <dev/pci/pcireg.h>
     55 #include <dev/pci/pcivar.h>
     56 #include <dev/pci/pciio.h>
     57 
     58 static int
     59 pciopen(dev_t dev, int flags, int mode,
     60     struct lwp *l)
     61 {
     62 	struct pci_softc *sc;
     63 	int unit;
     64 
     65 	unit = minor(dev);
     66 	sc = device_lookup(&pci_cd, unit);
     67 	if (sc == NULL)
     68 		return (ENXIO);
     69 
     70 	return (0);
     71 }
     72 
     73 static int
     74 pciioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
     75 {
     76 	struct pci_softc *sc = device_lookup(&pci_cd, minor(dev));
     77 	struct pciio_bdf_cfgreg *bdfr = (void *) data;
     78 	struct pciio_businfo *binfo = (void *) data;
     79 	pcitag_t tag;
     80 
     81 	switch (cmd) {
     82 	case PCI_IOC_BDF_CFGREAD:
     83 	case PCI_IOC_BDF_CFGWRITE:
     84 		if (bdfr->bus > 255 || bdfr->device >= sc->sc_maxndevs ||
     85 		    bdfr->function > 7)
     86 			return (EINVAL);
     87 		tag = pci_make_tag(sc->sc_pc, bdfr->bus, bdfr->device,
     88 		    bdfr->function);
     89 		if (cmd == PCI_IOC_BDF_CFGREAD)
     90 			bdfr->cfgreg.val = pci_conf_read(sc->sc_pc, tag,
     91 			    bdfr->cfgreg.reg);
     92 		else {
     93 			if ((flag & FWRITE) == 0)
     94 				return (EBADF);
     95 			pci_conf_write(sc->sc_pc, tag, bdfr->cfgreg.reg,
     96 			    bdfr->cfgreg.val);
     97 		}
     98 		break;
     99 
    100 	case PCI_IOC_BUSINFO:
    101 		binfo->busno = sc->sc_bus;
    102 		binfo->maxdevs = sc->sc_maxndevs;
    103 		break;
    104 
    105 	default:
    106 		return (ENOTTY);
    107 	}
    108 
    109 	return (0);
    110 }
    111 
    112 static paddr_t
    113 pcimmap(dev_t dev, off_t offset, int prot)
    114 {
    115 #if 0
    116 	struct pci_softc *sc = device_lookup(&pci_cd, minor(dev));
    117 
    118 	/*
    119 	 * Since we allow mapping of the entire bus, we
    120 	 * take the offset to be the address on the bus,
    121 	 * and pass 0 as the offset into that range.
    122 	 *
    123 	 * XXX Need a way to deal with linear/prefetchable/etc.
    124 	 */
    125 	return (bus_space_mmap(sc->sc_memt, offset, 0, prot, 0));
    126 #else
    127 	/* XXX Consider this further. */
    128 	return (-1);
    129 #endif
    130 }
    131 
    132 const struct cdevsw pci_cdevsw = {
    133 	pciopen, nullclose, noread, nowrite, pciioctl,
    134 	nostop, notty, nopoll, pcimmap, nokqfilter, D_OTHER,
    135 };
    136 
    137 /*
    138  * pci_devioctl:
    139  *
    140  *	PCI ioctls that can be performed on devices directly.
    141  */
    142 int
    143 pci_devioctl(pci_chipset_tag_t pc, pcitag_t tag, u_long cmd, caddr_t data,
    144     int flag, struct lwp *l)
    145 {
    146 	struct pciio_cfgreg *r = (void *) data;
    147 
    148 	switch (cmd) {
    149 	case PCI_IOC_CFGREAD:
    150 	case PCI_IOC_CFGWRITE:
    151 		if (cmd == PCI_IOC_CFGREAD)
    152 			r->val = pci_conf_read(pc, tag, r->reg);
    153 		else {
    154 			if ((flag & FWRITE) == 0)
    155 				return (EBADF);
    156 			pci_conf_write(pc, tag, r->reg, r->val);
    157 		}
    158 		break;
    159 
    160 	default:
    161 		return (EPASSTHROUGH);
    162 	}
    163 
    164 	return (0);
    165 }
    166