pci.c revision 1.33
1 /* $NetBSD: pci.c,v 1.33 1998/03/28 02:24:04 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1995, 1996, 1997 5 * Christopher G. Demetriou. All rights reserved. 6 * Copyright (c) 1994 Charles Hannum. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Charles Hannum. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * PCI bus autoconfiguration. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/device.h> 41 42 #include <dev/pci/pcireg.h> 43 #include <dev/pci/pcivar.h> 44 #include <dev/pci/pcidevs.h> 45 46 #ifdef __BROKEN_INDIRECT_CONFIG 47 int pcimatch __P((struct device *, void *, void *)); 48 #else 49 int pcimatch __P((struct device *, struct cfdata *, void *)); 50 #endif 51 void pciattach __P((struct device *, struct device *, void *)); 52 53 struct cfattach pci_ca = { 54 sizeof(struct device), pcimatch, pciattach 55 }; 56 57 int pciprint __P((void *, const char *)); 58 #ifdef __BROKEN_INDIRECT_CONFIG 59 int pcisubmatch __P((struct device *, void *, void *)); 60 #else 61 int pcisubmatch __P((struct device *, struct cfdata *, void *)); 62 #endif 63 64 /* 65 * Callback so that ISA/EISA bridges can attach their child busses 66 * after PCI configuration is done. 67 * 68 * This works because: 69 * (1) there can be at most one ISA/EISA bridge per PCI bus, and 70 * (2) any ISA/EISA bridges must be attached to primary PCI 71 * busses (i.e. bus zero). 72 * 73 * That boils down to: there can only be one of these outstanding 74 * at a time, it is cleared when configuring PCI bus 0 before any 75 * subdevices have been found, and it is run after all subdevices 76 * of PCI bus 0 have been found. 77 * 78 * This is needed because there are some (legacy) PCI devices which 79 * can show up as ISA/EISA devices as well (the prime example of which 80 * are VGA controllers). If you attach ISA from a PCI-ISA/EISA bridge, 81 * and the bridge is seen before the video board is, the board can show 82 * up as an ISA device, and that can (bogusly) complicate the PCI device's 83 * attach code, or make the PCI device not be properly attached at all. 84 */ 85 static void (*pci_isa_bridge_callback) __P((void *)); 86 static void *pci_isa_bridge_callback_arg; 87 88 int 89 #ifdef __BROKEN_INDIRECT_CONFIG 90 pcimatch(parent, match, aux) 91 #else 92 pcimatch(parent, cf, aux) 93 #endif 94 struct device *parent; 95 #ifdef __BROKEN_INDIRECT_CONFIG 96 void *match; 97 #else 98 struct cfdata *cf; 99 #endif 100 void *aux; 101 { 102 #ifdef __BROKEN_INDIRECT_CONFIG 103 struct cfdata *cf = match; 104 #endif 105 struct pcibus_attach_args *pba = aux; 106 107 if (strcmp(pba->pba_busname, cf->cf_driver->cd_name)) 108 return (0); 109 110 /* Check the locators */ 111 if (cf->pcibuscf_bus != PCIBUS_UNK_BUS && 112 cf->pcibuscf_bus != pba->pba_bus) 113 return (0); 114 115 /* sanity */ 116 if (pba->pba_bus < 0 || pba->pba_bus > 255) 117 return (0); 118 119 /* 120 * XXX check other (hardware?) indicators 121 */ 122 123 return 1; 124 } 125 126 void 127 pciattach(parent, self, aux) 128 struct device *parent, *self; 129 void *aux; 130 { 131 struct pcibus_attach_args *pba = aux; 132 bus_space_tag_t iot, memt; 133 pci_chipset_tag_t pc; 134 int bus, device, maxndevs, function, nfunctions; 135 int io_enabled, mem_enabled; 136 137 pci_attach_hook(parent, self, pba); 138 printf("\n"); 139 140 io_enabled = (pba->pba_flags & PCI_FLAGS_IO_ENABLED); 141 mem_enabled = (pba->pba_flags & PCI_FLAGS_MEM_ENABLED); 142 143 if (io_enabled == 0 && mem_enabled == 0) { 144 printf("%s: no spaces enabled!\n", self->dv_xname); 145 return; 146 } 147 148 printf("%s: ", self->dv_xname); 149 if (io_enabled) 150 printf("i/o enabled"); 151 if (mem_enabled) { 152 if (io_enabled) 153 printf(", "); 154 printf("memory enabled"); 155 } 156 printf("\n"); 157 158 iot = pba->pba_iot; 159 memt = pba->pba_memt; 160 pc = pba->pba_pc; 161 bus = pba->pba_bus; 162 maxndevs = pci_bus_maxdevs(pc, bus); 163 164 if (bus == 0) 165 pci_isa_bridge_callback = NULL; 166 167 for (device = 0; device < maxndevs; device++) { 168 pcitag_t tag; 169 pcireg_t id, class, intr, bhlcr, csr; 170 struct pci_attach_args pa; 171 int pin; 172 173 tag = pci_make_tag(pc, bus, device, 0); 174 id = pci_conf_read(pc, tag, PCI_ID_REG); 175 176 /* Invalid vendor ID value? */ 177 if (PCI_VENDOR(id) == PCI_VENDOR_INVALID) 178 continue; 179 /* XXX Not invalid, but we've done this ~forever. */ 180 if (PCI_VENDOR(id) == 0) 181 continue; 182 183 bhlcr = pci_conf_read(pc, tag, PCI_BHLC_REG); 184 nfunctions = PCI_HDRTYPE_MULTIFN(bhlcr) ? 8 : 1; 185 186 for (function = 0; function < nfunctions; function++) { 187 tag = pci_make_tag(pc, bus, device, function); 188 id = pci_conf_read(pc, tag, PCI_ID_REG); 189 csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG); 190 class = pci_conf_read(pc, tag, PCI_CLASS_REG); 191 intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG); 192 193 /* Invalid vendor ID value? */ 194 if (PCI_VENDOR(id) == PCI_VENDOR_INVALID) 195 continue; 196 /* XXX Not invalid, but we've done this ~forever. */ 197 if (PCI_VENDOR(id) == 0) 198 continue; 199 200 pa.pa_iot = iot; 201 pa.pa_memt = memt; 202 pa.pa_dmat = pba->pba_dmat; 203 pa.pa_pc = pc; 204 pa.pa_device = device; 205 pa.pa_function = function; 206 pa.pa_tag = tag; 207 pa.pa_id = id; 208 pa.pa_class = class; 209 210 /* set up memory and I/O enable flags as appropriate */ 211 pa.pa_flags = 0; 212 if ((pba->pba_flags & PCI_FLAGS_IO_ENABLED) && 213 (csr & PCI_COMMAND_IO_ENABLE)) 214 pa.pa_flags |= PCI_FLAGS_IO_ENABLED; 215 if ((pba->pba_flags & PCI_FLAGS_MEM_ENABLED) && 216 (csr & PCI_COMMAND_MEM_ENABLE)) 217 pa.pa_flags |= PCI_FLAGS_MEM_ENABLED; 218 219 if (bus == 0) { 220 pa.pa_intrswiz = 0; 221 pa.pa_intrtag = tag; 222 } else { 223 pa.pa_intrswiz = pba->pba_intrswiz + device; 224 pa.pa_intrtag = pba->pba_intrtag; 225 } 226 pin = PCI_INTERRUPT_PIN(intr); 227 if (pin == PCI_INTERRUPT_PIN_NONE) { 228 /* no interrupt */ 229 pa.pa_intrpin = 0; 230 } else { 231 /* 232 * swizzle it based on the number of 233 * busses we're behind and our device 234 * number. 235 */ 236 pa.pa_intrpin = /* XXX */ 237 ((pin + pa.pa_intrswiz - 1) % 4) + 1; 238 } 239 pa.pa_intrline = PCI_INTERRUPT_LINE(intr); 240 241 config_found_sm(self, &pa, pciprint, pcisubmatch); 242 } 243 } 244 245 if (bus == 0 && pci_isa_bridge_callback != NULL) 246 (*pci_isa_bridge_callback)(pci_isa_bridge_callback_arg); 247 } 248 249 int 250 pciprint(aux, pnp) 251 void *aux; 252 const char *pnp; 253 { 254 register struct pci_attach_args *pa = aux; 255 char devinfo[256]; 256 257 if (pnp) { 258 pci_devinfo(pa->pa_id, pa->pa_class, 1, devinfo); 259 printf("%s at %s", devinfo, pnp); 260 } 261 printf(" dev %d function %d", pa->pa_device, pa->pa_function); 262 #if 0 263 printf(" (%si/o, %smem)", 264 pa->pa_flags & PCI_FLAGS_IO_ENABLED ? "" : "no ", 265 pa->pa_flags & PCI_FLAGS_MEM_ENABLED ? "" : "no "); 266 #endif 267 return (UNCONF); 268 } 269 270 int 271 #ifdef __BROKEN_INDIRECT_CONFIG 272 pcisubmatch(parent, match, aux) 273 #else 274 pcisubmatch(parent, cf, aux) 275 #endif 276 struct device *parent; 277 #ifdef __BROKEN_INDIRECT_CONFIG 278 void *match; 279 #else 280 struct cfdata *cf; 281 #endif 282 void *aux; 283 { 284 #ifdef __BROKEN_INDIRECT_CONFIG 285 struct cfdata *cf = match; 286 #endif 287 struct pci_attach_args *pa = aux; 288 289 if (cf->pcicf_dev != PCI_UNK_DEV && 290 cf->pcicf_dev != pa->pa_device) 291 return 0; 292 if (cf->pcicf_function != PCI_UNK_FUNCTION && 293 cf->pcicf_function != pa->pa_function) 294 return 0; 295 return ((*cf->cf_attach->ca_match)(parent, cf, aux)); 296 } 297 298 void 299 set_pci_isa_bridge_callback(fn, arg) 300 void (*fn) __P((void *)); 301 void *arg; 302 { 303 304 if (pci_isa_bridge_callback != NULL) 305 panic("set_pci_isa_bridge_callback"); 306 pci_isa_bridge_callback = fn; 307 pci_isa_bridge_callback_arg = arg; 308 } 309
Indexes created Tue Sep 30 20:09:53 GMT 2025