1 /* $NetBSD: ppb.c,v 1.36 2007/12/09 20:28:13 jmcneill 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 1.36 2007/12/09 20:28:13 jmcneill 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 #include <dev/pci/pcidevs.h> 45 46 struct ppb_softc { 47 struct device sc_dev; /* generic device glue */ 48 pci_chipset_tag_t sc_pc; /* our PCI chipset... */ 49 pcitag_t sc_tag; /* ...and tag. */ 50 51 pcireg_t sc_pciconfext[48]; 52 }; 53 54 static bool ppb_resume(device_t); 55 static bool ppb_suspend(device_t); 56 57 static int 58 ppbmatch(struct device *parent, struct cfdata *match, 59 void *aux) 60 { 61 struct pci_attach_args *pa = aux; 62 63 /* 64 * Check the ID register to see that it's a PCI bridge. 65 * If it is, we assume that we can deal with it; it _should_ 66 * work in a standardized way... 67 */ 68 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE && 69 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI) 70 return (1); 71 72 return (0); 73 } 74 75 static void 76 ppb_fix_pcix(device_t self) 77 { 78 struct ppb_softc *sc = device_private(self); 79 pcireg_t reg; 80 int off; 81 82 if (!pci_get_capability(sc->sc_pc, sc->sc_tag, PCI_CAP_PCIEXPRESS, 83 &off, ®)) 84 return; /* Not a PCIe device */ 85 86 if ((reg & 0x000f0000) != 0x00010000) { 87 aprint_normal_dev(self, "unuspported PCI Express version\n"); 88 return; 89 } 90 reg = pci_conf_read(sc->sc_pc, sc->sc_tag, off + 0x18); 91 if (reg & 0x003f) { 92 aprint_normal_dev(self, "disabling notification events\n"); 93 reg &= ~0x003f; 94 pci_conf_write(sc->sc_pc, sc->sc_tag, off + 0x18, reg); 95 } 96 } 97 98 static void 99 ppbattach(struct device *parent, struct device *self, void *aux) 100 { 101 struct ppb_softc *sc = (void *) self; 102 struct pci_attach_args *pa = aux; 103 pci_chipset_tag_t pc = pa->pa_pc; 104 struct pcibus_attach_args pba; 105 pcireg_t busdata; 106 char devinfo[256]; 107 108 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 109 aprint_normal(": %s (rev. 0x%02x)\n", devinfo, 110 PCI_REVISION(pa->pa_class)); 111 aprint_naive("\n"); 112 113 sc->sc_pc = pc; 114 sc->sc_tag = pa->pa_tag; 115 116 busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO); 117 118 if (PPB_BUSINFO_SECONDARY(busdata) == 0) { 119 aprint_normal("%s: not configured by system firmware\n", 120 self->dv_xname); 121 return; 122 } 123 124 ppb_fix_pcix(self); 125 126 #if 0 127 /* 128 * XXX can't do this, because we're not given our bus number 129 * (we shouldn't need it), and because we've no way to 130 * decompose our tag. 131 */ 132 /* sanity check. */ 133 if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata)) 134 panic("ppbattach: bus in tag (%d) != bus in reg (%d)", 135 pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata)); 136 #endif 137 138 if (!pmf_device_register(self, ppb_suspend, ppb_resume)) 139 aprint_error_dev(self, "couldn't establish power handler\n"); 140 141 /* 142 * Attach the PCI bus than hangs off of it. 143 * 144 * XXX Don't pass-through Memory Read Multiple. Should we? 145 * XXX Consult the spec... 146 */ 147 pba.pba_iot = pa->pa_iot; 148 pba.pba_memt = pa->pa_memt; 149 pba.pba_dmat = pa->pa_dmat; 150 pba.pba_dmat64 = pa->pa_dmat64; 151 pba.pba_pc = pc; 152 pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY; 153 pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata); 154 pba.pba_bridgetag = &sc->sc_tag; 155 pba.pba_intrswiz = pa->pa_intrswiz; 156 pba.pba_intrtag = pa->pa_intrtag; 157 158 config_found_ia(self, "pcibus", &pba, pcibusprint); 159 } 160 161 static bool 162 ppb_resume(device_t dv) 163 { 164 struct ppb_softc *sc = device_private(dv); 165 int off; 166 pcireg_t val; 167 168 for (off = 0x40; off <= 0xff; off += 4) { 169 val = pci_conf_read(sc->sc_pc, sc->sc_tag, off); 170 if (val != sc->sc_pciconfext[(off - 0x40) / 4]) 171 pci_conf_write(sc->sc_pc, sc->sc_tag, off, 172 sc->sc_pciconfext[(off - 0x40)/4]); 173 } 174 175 ppb_fix_pcix(dv); 176 177 return true; 178 } 179 180 static bool 181 ppb_suspend(device_t dv) 182 { 183 struct ppb_softc *sc = device_private(dv); 184 int off; 185 186 for (off = 0x40; off <= 0xff; off += 4) 187 sc->sc_pciconfext[(off - 0x40) / 4] = 188 pci_conf_read(sc->sc_pc, sc->sc_tag, off); 189 190 return true; 191 } 192 193 CFATTACH_DECL(ppb, sizeof(struct ppb_softc), 194 ppbmatch, ppbattach, NULL, NULL); 195