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pci_usrreq.c revision 1.14.36.2 
      1 /*	$NetBSD: pci_usrreq.c,v 1.14.36.2 2008/06/29 09:33:09 mjf 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 1.14.36.2 2008/06/29 09:33:09 mjf 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, struct lwp *l)
     60 {
     61 	device_t dv;
     62 
     63 	dv = device_lookup(&pci_cd, minor(dev));
     64 	if (dv == NULL)
     65 		return (ENXIO);
     66 
     67 	return (0);
     68 }
     69 
     70 static int
     71 pciioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
     72 {
     73 	struct pci_softc *sc =
     74 	    device_lookup_private(&pci_cd, minor(dev));
     75 	struct pciio_bdf_cfgreg *bdfr = (void *) data;
     76 	struct pciio_businfo *binfo = (void *) data;
     77 	pcitag_t tag;
     78 
     79 	switch (cmd) {
     80 	case PCI_IOC_BDF_CFGREAD:
     81 	case PCI_IOC_BDF_CFGWRITE:
     82 		if (bdfr->bus > 255 || bdfr->device >= sc->sc_maxndevs ||
     83 		    bdfr->function > 7)
     84 			return (EINVAL);
     85 		tag = pci_make_tag(sc->sc_pc, bdfr->bus, bdfr->device,
     86 		    bdfr->function);
     87 		if (cmd == PCI_IOC_BDF_CFGREAD)
     88 			bdfr->cfgreg.val = pci_conf_read(sc->sc_pc, tag,
     89 			    bdfr->cfgreg.reg);
     90 		else {
     91 			if ((flag & FWRITE) == 0)
     92 				return (EBADF);
     93 			pci_conf_write(sc->sc_pc, tag, bdfr->cfgreg.reg,
     94 			    bdfr->cfgreg.val);
     95 		}
     96 		break;
     97 
     98 	case PCI_IOC_BUSINFO:
     99 		binfo->busno = sc->sc_bus;
    100 		binfo->maxdevs = sc->sc_maxndevs;
    101 		break;
    102 
    103 	default:
    104 		return (ENOTTY);
    105 	}
    106 
    107 	return (0);
    108 }
    109 
    110 static paddr_t
    111 pcimmap(dev_t dev, off_t offset, int prot)
    112 {
    113 #if 0
    114 	struct pci_softc *sc = device_lookup_private(&pci_cd, minor(dev));
    115 
    116 	/*
    117 	 * Since we allow mapping of the entire bus, we
    118 	 * take the offset to be the address on the bus,
    119 	 * and pass 0 as the offset into that range.
    120 	 *
    121 	 * XXX Need a way to deal with linear/prefetchable/etc.
    122 	 */
    123 	return (bus_space_mmap(sc->sc_memt, offset, 0, prot, 0));
    124 #else
    125 	/* XXX Consider this further. */
    126 	return (-1);
    127 #endif
    128 }
    129 
    130 const struct cdevsw pci_cdevsw = {
    131 	pciopen, nullclose, noread, nowrite, pciioctl,
    132 	nostop, notty, nopoll, pcimmap, nokqfilter, D_OTHER,
    133 };
    134 
    135 /*
    136  * pci_devioctl:
    137  *
    138  *	PCI ioctls that can be performed on devices directly.
    139  */
    140 int
    141 pci_devioctl(pci_chipset_tag_t pc, pcitag_t tag, u_long cmd, void *data,
    142     int flag, struct lwp *l)
    143 {
    144 	struct pciio_cfgreg *r = (void *) data;
    145 
    146 	switch (cmd) {
    147 	case PCI_IOC_CFGREAD:
    148 	case PCI_IOC_CFGWRITE:
    149 		if (cmd == PCI_IOC_CFGREAD)
    150 			r->val = pci_conf_read(pc, tag, r->reg);
    151 		else {
    152 			if ((flag & FWRITE) == 0)
    153 				return (EBADF);
    154 			pci_conf_write(pc, tag, r->reg, r->val);
    155 		}
    156 		break;
    157 
    158 	default:
    159 		return (EPASSTHROUGH);
    160 	}
    161 
    162 	return (0);
    163 }
    164