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ppb.c revision 1.35 
      1 /*	$NetBSD: ppb.c,v 1.35 2007/10/16 18:27:00 joerg Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996, 1998 Christopher G. Demetriou.  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 Christopher G. Demetriou
     17  *	for the NetBSD Project.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: ppb.c,v 1.35 2007/10/16 18:27:00 joerg Exp $");
     35 
     36 #include <sys/param.h>
     37 #include <sys/systm.h>
     38 #include <sys/kernel.h>
     39 #include <sys/device.h>
     40 
     41 #include <dev/pci/pcireg.h>
     42 #include <dev/pci/pcivar.h>
     43 #include <dev/pci/ppbreg.h>
     44 
     45 struct ppb_softc {
     46 	struct device sc_dev;		/* generic device glue */
     47 	pci_chipset_tag_t sc_pc;	/* our PCI chipset... */
     48 	pcitag_t sc_tag;		/* ...and tag. */
     49 };
     50 
     51 static int
     52 ppbmatch(struct device *parent, struct cfdata *match,
     53     void *aux)
     54 {
     55 	struct pci_attach_args *pa = aux;
     56 
     57 	/*
     58 	 * Check the ID register to see that it's a PCI bridge.
     59 	 * If it is, we assume that we can deal with it; it _should_
     60 	 * work in a standardized way...
     61 	 */
     62 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
     63 	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
     64 		return (1);
     65 
     66 	return (0);
     67 }
     68 
     69 static void
     70 ppb_fix_pcix(device_t self, struct pci_attach_args *pa)
     71 {
     72 	pcireg_t reg;
     73 	int off;
     74 
     75 	if (!pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_PCIEXPRESS,
     76 				&off, &reg))
     77 		return; /* Not a PCIe device */
     78 
     79 	if ((reg & 0x000f0000) != 0x00010000) {
     80 		aprint_normal_dev(self, "unuspported PCI Express version\n");
     81 		return;
     82 	}
     83 	reg = pci_conf_read(pa->pa_pc, pa->pa_tag, off + 0x18);
     84 	if (reg & 0x003f) {
     85 		aprint_normal_dev(self, "disabling notification events\n");
     86 		reg &= ~0x003f;
     87 		pci_conf_write(pa->pa_pc, pa->pa_tag, off + 0x18, reg);
     88 	}
     89 }
     90 
     91 static void
     92 ppbattach(struct device *parent, struct device *self, void *aux)
     93 {
     94 	struct ppb_softc *sc = (void *) self;
     95 	struct pci_attach_args *pa = aux;
     96 	pci_chipset_tag_t pc = pa->pa_pc;
     97 	struct pcibus_attach_args pba;
     98 	pcireg_t busdata;
     99 	char devinfo[256];
    100 
    101 	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo));
    102 	aprint_normal(": %s (rev. 0x%02x)\n", devinfo,
    103 	    PCI_REVISION(pa->pa_class));
    104 	aprint_naive("\n");
    105 
    106 	sc->sc_pc = pc;
    107 	sc->sc_tag = pa->pa_tag;
    108 
    109 	busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO);
    110 
    111 	if (PPB_BUSINFO_SECONDARY(busdata) == 0) {
    112 		aprint_normal("%s: not configured by system firmware\n",
    113 		    self->dv_xname);
    114 		return;
    115 	}
    116 
    117 	ppb_fix_pcix(self, pa);
    118 
    119 #if 0
    120 	/*
    121 	 * XXX can't do this, because we're not given our bus number
    122 	 * (we shouldn't need it), and because we've no way to
    123 	 * decompose our tag.
    124 	 */
    125 	/* sanity check. */
    126 	if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata))
    127 		panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
    128 		    pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata));
    129 #endif
    130 
    131 	/*
    132 	 * Attach the PCI bus than hangs off of it.
    133 	 *
    134 	 * XXX Don't pass-through Memory Read Multiple.  Should we?
    135 	 * XXX Consult the spec...
    136 	 */
    137 	pba.pba_iot = pa->pa_iot;
    138 	pba.pba_memt = pa->pa_memt;
    139 	pba.pba_dmat = pa->pa_dmat;
    140 	pba.pba_dmat64 = pa->pa_dmat64;
    141 	pba.pba_pc = pc;
    142 	pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY;
    143 	pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata);
    144 	pba.pba_bridgetag = &sc->sc_tag;
    145 	pba.pba_intrswiz = pa->pa_intrswiz;
    146 	pba.pba_intrtag = pa->pa_intrtag;
    147 
    148 	config_found_ia(self, "pcibus", &pba, pcibusprint);
    149 }
    150 
    151 CFATTACH_DECL(ppb, sizeof(struct ppb_softc),
    152     ppbmatch, ppbattach, NULL, NULL);
    153