1 /* $NetBSD: ppb.c,v 1.47 2011/10/21 21:35:28 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 1.47 2011/10/21 21:35:28 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 #define PCI_PCIE_SLCSR_NOTIFY_MASK \ 47 (PCI_PCIE_SLCSR_ABE | PCI_PCIE_SLCSR_PFE | PCI_PCIE_SLCSR_MSE | \ 48 PCI_PCIE_SLCSR_PDE | PCI_PCIE_SLCSR_CCE | PCI_PCIE_SLCSR_HPE) 49 50 struct ppb_softc { 51 device_t sc_dev; /* generic device glue */ 52 pci_chipset_tag_t sc_pc; /* our PCI chipset... */ 53 pcitag_t sc_tag; /* ...and tag. */ 54 55 pcireg_t sc_pciconfext[48]; 56 }; 57 58 static bool ppb_resume(device_t, const pmf_qual_t *); 59 static bool ppb_suspend(device_t, const pmf_qual_t *); 60 61 static int 62 ppbmatch(device_t parent, cfdata_t match, void *aux) 63 { 64 struct pci_attach_args *pa = aux; 65 66 /* 67 * Check the ID register to see that it's a PCI bridge. 68 * If it is, we assume that we can deal with it; it _should_ 69 * work in a standardized way... 70 */ 71 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE && 72 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI) 73 return 1; 74 75 #ifdef __powerpc__ 76 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_PROCESSOR && 77 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_PROCESSOR_POWERPC) { 78 pcireg_t bhlc = pci_conf_read(pa->pa_pc, pa->pa_tag, 79 PCI_BHLC_REG); 80 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_FREESCALE 81 && PCI_HDRTYPE(bhlc) == PCI_HDRTYPE_RC) 82 return 1; 83 } 84 #endif 85 86 return 0; 87 } 88 89 static void 90 ppb_fix_pcie(device_t self) 91 { 92 struct ppb_softc *sc = device_private(self); 93 pcireg_t reg; 94 int off; 95 96 if (!pci_get_capability(sc->sc_pc, sc->sc_tag, PCI_CAP_PCIEXPRESS, 97 &off, ®)) 98 return; /* Not a PCIe device */ 99 100 aprint_normal_dev(self, "PCI Express "); 101 switch (reg & PCI_PCIE_XCAP_VER_MASK) { 102 case PCI_PCIE_XCAP_VER_1_0: 103 aprint_normal("1.0"); 104 break; 105 case PCI_PCIE_XCAP_VER_2_0: 106 aprint_normal("2.0"); 107 break; 108 default: 109 aprint_normal_dev(self, 110 "version unsupported (0x%" PRIxMAX ")\n", 111 __SHIFTOUT(reg, PCI_PCIE_XCAP_VER_MASK)); 112 return; 113 } 114 aprint_normal(" <"); 115 switch (reg & PCI_PCIE_XCAP_TYPE_MASK) { 116 case PCI_PCIE_XCAP_TYPE_PCIE_DEV: 117 aprint_normal("PCI-E Endpoint device"); 118 break; 119 case PCI_PCIE_XCAP_TYPE_PCI_DEV: 120 aprint_normal("Legacy PCI-E Endpoint device"); 121 break; 122 case PCI_PCIE_XCAP_TYPE_ROOT: 123 aprint_normal("Root Port of PCI-E Root Complex"); 124 break; 125 case PCI_PCIE_XCAP_TYPE_UP: 126 aprint_normal("Upstream Port of PCI-E Switch"); 127 break; 128 case PCI_PCIE_XCAP_TYPE_DOWN: 129 aprint_normal("Downstream Port of PCI-E Switch"); 130 break; 131 case PCI_PCIE_XCAP_TYPE_PCIE2PCI: 132 aprint_normal("PCI-E to PCI/PCI-X Bridge"); 133 break; 134 case PCI_PCIE_XCAP_TYPE_PCI2PCIE: 135 aprint_normal("PCI/PCI-X to PCI-E Bridge"); 136 break; 137 default: 138 aprint_normal("Device/Port Type 0x%" PRIxMAX, 139 __SHIFTOUT(reg, PCI_PCIE_XCAP_TYPE_MASK)); 140 break; 141 } 142 aprint_normal(">\n"); 143 144 reg = pci_conf_read(sc->sc_pc, sc->sc_tag, off + PCI_PCIE_SLCSR); 145 if (reg & PCI_PCIE_SLCSR_NOTIFY_MASK) { 146 aprint_debug_dev(self, "disabling notification events\n"); 147 reg &= ~PCI_PCIE_SLCSR_NOTIFY_MASK; 148 pci_conf_write(sc->sc_pc, sc->sc_tag, 149 off + PCI_PCIE_SLCSR, reg); 150 } 151 } 152 153 static void 154 ppbattach(device_t parent, device_t self, void *aux) 155 { 156 struct ppb_softc *sc = device_private(self); 157 struct pci_attach_args *pa = aux; 158 pci_chipset_tag_t pc = pa->pa_pc; 159 struct pcibus_attach_args pba; 160 pcireg_t busdata; 161 char devinfo[256]; 162 163 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 164 aprint_normal(": %s (rev. 0x%02x)\n", devinfo, 165 PCI_REVISION(pa->pa_class)); 166 aprint_naive("\n"); 167 168 sc->sc_pc = pc; 169 sc->sc_tag = pa->pa_tag; 170 sc->sc_dev = self; 171 172 busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO); 173 174 if (PPB_BUSINFO_SECONDARY(busdata) == 0) { 175 aprint_normal_dev(self, "not configured by system firmware\n"); 176 return; 177 } 178 179 ppb_fix_pcie(self); 180 181 #if 0 182 /* 183 * XXX can't do this, because we're not given our bus number 184 * (we shouldn't need it), and because we've no way to 185 * decompose our tag. 186 */ 187 /* sanity check. */ 188 if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata)) 189 panic("ppbattach: bus in tag (%d) != bus in reg (%d)", 190 pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata)); 191 #endif 192 193 if (!pmf_device_register(self, ppb_suspend, ppb_resume)) 194 aprint_error_dev(self, "couldn't establish power handler\n"); 195 196 /* 197 * Attach the PCI bus than hangs off of it. 198 * 199 * XXX Don't pass-through Memory Read Multiple. Should we? 200 * XXX Consult the spec... 201 */ 202 pba.pba_iot = pa->pa_iot; 203 pba.pba_memt = pa->pa_memt; 204 pba.pba_dmat = pa->pa_dmat; 205 pba.pba_dmat64 = pa->pa_dmat64; 206 pba.pba_pc = pc; 207 pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY; 208 pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata); 209 pba.pba_sub = PPB_BUSINFO_SUBORDINATE(busdata); 210 pba.pba_bridgetag = &sc->sc_tag; 211 pba.pba_intrswiz = pa->pa_intrswiz; 212 pba.pba_intrtag = pa->pa_intrtag; 213 214 config_found_ia(self, "pcibus", &pba, pcibusprint); 215 } 216 217 static int 218 ppbdetach(device_t self, int flags) 219 { 220 int rc; 221 222 if ((rc = config_detach_children(self, flags)) != 0) 223 return rc; 224 pmf_device_deregister(self); 225 return 0; 226 } 227 228 static bool 229 ppb_resume(device_t dv, const pmf_qual_t *qual) 230 { 231 struct ppb_softc *sc = device_private(dv); 232 int off; 233 pcireg_t val; 234 235 for (off = 0x40; off <= 0xff; off += 4) { 236 val = pci_conf_read(sc->sc_pc, sc->sc_tag, off); 237 if (val != sc->sc_pciconfext[(off - 0x40) / 4]) 238 pci_conf_write(sc->sc_pc, sc->sc_tag, off, 239 sc->sc_pciconfext[(off - 0x40)/4]); 240 } 241 242 ppb_fix_pcie(dv); 243 244 return true; 245 } 246 247 static bool 248 ppb_suspend(device_t dv, const pmf_qual_t *qual) 249 { 250 struct ppb_softc *sc = device_private(dv); 251 int off; 252 253 for (off = 0x40; off <= 0xff; off += 4) 254 sc->sc_pciconfext[(off - 0x40) / 4] = 255 pci_conf_read(sc->sc_pc, sc->sc_tag, off); 256 257 return true; 258 } 259 260 static void 261 ppbchilddet(device_t self, device_t child) 262 { 263 /* we keep no references to child devices, so do nothing */ 264 } 265 266 CFATTACH_DECL3_NEW(ppb, sizeof(struct ppb_softc), 267 ppbmatch, ppbattach, ppbdetach, NULL, NULL, ppbchilddet, 268 DVF_DETACH_SHUTDOWN); 269