1 /* $NetBSD: ppb.c,v 1.37 2008/02/22 22:15:31 dyoung 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 1.37 2008/02/22 22:15:31 dyoung 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 PMF_FN_PROTO); 55 static bool ppb_suspend(device_t PMF_FN_PROTO); 56 57 static int 58 ppbmatch(device_t parent, struct cfdata *match, void *aux) 59 { 60 struct pci_attach_args *pa = aux; 61 62 /* 63 * Check the ID register to see that it's a PCI bridge. 64 * If it is, we assume that we can deal with it; it _should_ 65 * work in a standardized way... 66 */ 67 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE && 68 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI) 69 return (1); 70 71 return (0); 72 } 73 74 static void 75 ppb_fix_pcix(device_t self) 76 { 77 struct ppb_softc *sc = device_private(self); 78 pcireg_t reg; 79 int off; 80 81 if (!pci_get_capability(sc->sc_pc, sc->sc_tag, PCI_CAP_PCIEXPRESS, 82 &off, ®)) 83 return; /* Not a PCIe device */ 84 85 if ((reg & 0x000f0000) != 0x00010000) { 86 aprint_normal_dev(self, "unuspported PCI Express version\n"); 87 return; 88 } 89 reg = pci_conf_read(sc->sc_pc, sc->sc_tag, off + 0x18); 90 if (reg & 0x003f) { 91 aprint_normal_dev(self, "disabling notification events\n"); 92 reg &= ~0x003f; 93 pci_conf_write(sc->sc_pc, sc->sc_tag, off + 0x18, reg); 94 } 95 } 96 97 static void 98 ppbattach(device_t parent, device_t self, void *aux) 99 { 100 struct ppb_softc *sc = device_private(self); 101 struct pci_attach_args *pa = aux; 102 pci_chipset_tag_t pc = pa->pa_pc; 103 struct pcibus_attach_args pba; 104 pcireg_t busdata; 105 char devinfo[256]; 106 107 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 108 aprint_normal(": %s (rev. 0x%02x)\n", devinfo, 109 PCI_REVISION(pa->pa_class)); 110 aprint_naive("\n"); 111 112 sc->sc_pc = pc; 113 sc->sc_tag = pa->pa_tag; 114 115 busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO); 116 117 if (PPB_BUSINFO_SECONDARY(busdata) == 0) { 118 aprint_normal_dev(self, "not configured by system firmware\n"); 119 return; 120 } 121 122 ppb_fix_pcix(self); 123 124 #if 0 125 /* 126 * XXX can't do this, because we're not given our bus number 127 * (we shouldn't need it), and because we've no way to 128 * decompose our tag. 129 */ 130 /* sanity check. */ 131 if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata)) 132 panic("ppbattach: bus in tag (%d) != bus in reg (%d)", 133 pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata)); 134 #endif 135 136 if (!pmf_device_register(self, ppb_suspend, ppb_resume)) 137 aprint_error_dev(self, "couldn't establish power handler\n"); 138 139 /* 140 * Attach the PCI bus than hangs off of it. 141 * 142 * XXX Don't pass-through Memory Read Multiple. Should we? 143 * XXX Consult the spec... 144 */ 145 pba.pba_iot = pa->pa_iot; 146 pba.pba_memt = pa->pa_memt; 147 pba.pba_dmat = pa->pa_dmat; 148 pba.pba_dmat64 = pa->pa_dmat64; 149 pba.pba_pc = pc; 150 pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY; 151 pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata); 152 pba.pba_bridgetag = &sc->sc_tag; 153 pba.pba_intrswiz = pa->pa_intrswiz; 154 pba.pba_intrtag = pa->pa_intrtag; 155 156 config_found_ia(self, "pcibus", &pba, pcibusprint); 157 } 158 159 static int 160 ppbdetach(device_t self, int flags) 161 { 162 int rc; 163 164 if ((rc = config_detach_children(self, flags)) != 0) 165 return rc; 166 pmf_device_deregister(self); 167 return 0; 168 } 169 170 static bool 171 ppb_resume(device_t dv PMF_FN_ARGS) 172 { 173 struct ppb_softc *sc = device_private(dv); 174 int off; 175 pcireg_t val; 176 177 for (off = 0x40; off <= 0xff; off += 4) { 178 val = pci_conf_read(sc->sc_pc, sc->sc_tag, off); 179 if (val != sc->sc_pciconfext[(off - 0x40) / 4]) 180 pci_conf_write(sc->sc_pc, sc->sc_tag, off, 181 sc->sc_pciconfext[(off - 0x40)/4]); 182 } 183 184 ppb_fix_pcix(dv); 185 186 return true; 187 } 188 189 static bool 190 ppb_suspend(device_t dv PMF_FN_ARGS) 191 { 192 struct ppb_softc *sc = device_private(dv); 193 int off; 194 195 for (off = 0x40; off <= 0xff; off += 4) 196 sc->sc_pciconfext[(off - 0x40) / 4] = 197 pci_conf_read(sc->sc_pc, sc->sc_tag, off); 198 199 return true; 200 } 201 202 static void 203 ppbchilddet(device_t self, device_t child) 204 { 205 /* we keep no references to child devices, so do nothing */ 206 } 207 208 CFATTACH_DECL2(ppb, sizeof(struct ppb_softc), 209 ppbmatch, ppbattach, ppbdetach, NULL, NULL, ppbchilddet); 210