1 /* $NetBSD: pci.c,v 1.21 1996/08/27 21:59:51 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1995, 1996 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1994 Charles Hannum. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Charles Hannum. 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 /* 34 * PCI bus autoconfiguration. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/device.h> 40 41 #include <dev/pci/pcireg.h> 42 #include <dev/pci/pcivar.h> 43 44 int pcimatch __P((struct device *, void *, void *)); 45 void pciattach __P((struct device *, struct device *, void *)); 46 47 struct cfattach pci_ca = { 48 sizeof(struct device), pcimatch, pciattach 49 }; 50 51 struct cfdriver pci_cd = { 52 NULL, "pci", DV_DULL 53 }; 54 55 int pciprint __P((void *, const char *)); 56 int pcisubmatch __P((struct device *, void *, void *)); 57 58 int 59 pcimatch(parent, match, aux) 60 struct device *parent; 61 void *match, *aux; 62 { 63 struct cfdata *cf = match; 64 struct pcibus_attach_args *pba = aux; 65 66 if (strcmp(pba->pba_busname, cf->cf_driver->cd_name)) 67 return (0); 68 69 /* Check the locators */ 70 if (cf->pcibuscf_bus != PCIBUS_UNK_BUS && 71 cf->pcibuscf_bus != pba->pba_bus) 72 return (0); 73 74 /* sanity */ 75 if (pba->pba_bus < 0 || pba->pba_bus > 255) 76 return (0); 77 78 /* 79 * XXX check other (hardware?) indicators 80 */ 81 82 return 1; 83 } 84 85 void 86 pciattach(parent, self, aux) 87 struct device *parent, *self; 88 void *aux; 89 { 90 struct pcibus_attach_args *pba = aux; 91 bus_chipset_tag_t bc; 92 pci_chipset_tag_t pc; 93 int bus, device, maxndevs, function, nfunctions; 94 95 pci_attach_hook(parent, self, pba); 96 printf("\n"); 97 98 bc = pba->pba_bc; 99 pc = pba->pba_pc; 100 bus = pba->pba_bus; 101 maxndevs = pci_bus_maxdevs(pc, bus); 102 103 for (device = 0; device < maxndevs; device++) { 104 pcitag_t tag; 105 pcireg_t id, class, intr, bhlcr; 106 struct pci_attach_args pa; 107 int pin; 108 109 tag = pci_make_tag(pc, bus, device, 0); 110 id = pci_conf_read(pc, tag, PCI_ID_REG); 111 if (id == 0 || id == 0xffffffff) 112 continue; 113 114 bhlcr = pci_conf_read(pc, tag, PCI_BHLC_REG); 115 nfunctions = PCI_HDRTYPE_MULTIFN(bhlcr) ? 8 : 1; 116 117 for (function = 0; function < nfunctions; function++) { 118 tag = pci_make_tag(pc, bus, device, function); 119 id = pci_conf_read(pc, tag, PCI_ID_REG); 120 if (id == 0 || id == 0xffffffff) 121 continue; 122 class = pci_conf_read(pc, tag, PCI_CLASS_REG); 123 intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG); 124 125 pa.pa_bc = bc; 126 pa.pa_pc = pc; 127 pa.pa_device = device; 128 pa.pa_function = function; 129 pa.pa_tag = tag; 130 pa.pa_id = id; 131 pa.pa_class = class; 132 133 if (bus == 0) { 134 pa.pa_intrswiz = 0; 135 pa.pa_intrtag = tag; 136 } else { 137 pa.pa_intrswiz = pba->pba_intrswiz + device; 138 pa.pa_intrtag = pba->pba_intrtag; 139 } 140 pin = PCI_INTERRUPT_PIN(intr); 141 if (pin == PCI_INTERRUPT_PIN_NONE) { 142 /* no interrupt */ 143 pa.pa_intrpin = 0; 144 } else { 145 /* 146 * swizzle it based on the number of 147 * busses we're behind and our device 148 * number. 149 */ 150 pa.pa_intrpin = /* XXX */ 151 ((pin + pa.pa_intrswiz - 1) % 4) + 1; 152 } 153 pa.pa_intrline = PCI_INTERRUPT_LINE(intr); 154 155 config_found_sm(self, &pa, pciprint, pcisubmatch); 156 } 157 } 158 } 159 160 int 161 pciprint(aux, pnp) 162 void *aux; 163 const char *pnp; 164 { 165 register struct pci_attach_args *pa = aux; 166 char devinfo[256]; 167 168 if (pnp) { 169 pci_devinfo(pa->pa_id, pa->pa_class, 1, devinfo); 170 printf("%s at %s", devinfo, pnp); 171 } 172 printf(" dev %d function %d", pa->pa_device, pa->pa_function); 173 return (UNCONF); 174 } 175 176 int 177 pcisubmatch(parent, match, aux) 178 struct device *parent; 179 void *match, *aux; 180 { 181 struct cfdata *cf = match; 182 struct pci_attach_args *pa = aux; 183 184 if (cf->pcicf_dev != PCI_UNK_DEV && 185 cf->pcicf_dev != pa->pa_device) 186 return 0; 187 if (cf->pcicf_function != PCI_UNK_FUNCTION && 188 cf->pcicf_function != pa->pa_function) 189 return 0; 190 return ((*cf->cf_attach->ca_match)(parent, match, aux)); 191 } 192 193 int 194 pci_io_find(pc, pcitag, reg, iobasep, iosizep) 195 pci_chipset_tag_t pc; 196 pcitag_t pcitag; 197 int reg; 198 bus_io_addr_t *iobasep; 199 bus_io_size_t *iosizep; 200 { 201 pcireg_t addrdata, sizedata; 202 int s; 203 204 if (reg < PCI_MAPREG_START || reg >= PCI_MAPREG_END || (reg & 3)) 205 panic("pci_io_find: bad request"); 206 207 /* XXX? 208 * Section 6.2.5.1, `Address Maps', tells us that: 209 * 210 * 1) The builtin software should have already mapped the device in a 211 * reasonable way. 212 * 213 * 2) A device which wants 2^n bytes of memory will hardwire the bottom 214 * n bits of the address to 0. As recommended, we write all 1s and see 215 * what we get back. 216 */ 217 addrdata = pci_conf_read(pc, pcitag, reg); 218 219 s = splhigh(); 220 pci_conf_write(pc, pcitag, reg, 0xffffffff); 221 sizedata = pci_conf_read(pc, pcitag, reg); 222 pci_conf_write(pc, pcitag, reg, addrdata); 223 splx(s); 224 225 if (PCI_MAPREG_TYPE(addrdata) != PCI_MAPREG_TYPE_IO) 226 panic("pci_io_find: not an I/O region"); 227 228 if (iobasep != NULL) 229 *iobasep = PCI_MAPREG_IO_ADDR(addrdata); 230 if (iosizep != NULL) 231 *iosizep = PCI_MAPREG_IO_SIZE(sizedata); 232 233 return (0); 234 } 235 236 int 237 pci_mem_find(pc, pcitag, reg, membasep, memsizep, cacheablep) 238 pci_chipset_tag_t pc; 239 pcitag_t pcitag; 240 int reg; 241 bus_mem_addr_t *membasep; 242 bus_mem_size_t *memsizep; 243 int *cacheablep; 244 { 245 pcireg_t addrdata, sizedata; 246 int s; 247 248 if (reg < PCI_MAPREG_START || reg >= PCI_MAPREG_END || (reg & 3)) 249 panic("pci_find_mem: bad request"); 250 251 /* 252 * Section 6.2.5.1, `Address Maps', tells us that: 253 * 254 * 1) The builtin software should have already mapped the device in a 255 * reasonable way. 256 * 257 * 2) A device which wants 2^n bytes of memory will hardwire the bottom 258 * n bits of the address to 0. As recommended, we write all 1s and see 259 * what we get back. 260 */ 261 addrdata = pci_conf_read(pc, pcitag, reg); 262 263 s = splhigh(); 264 pci_conf_write(pc, pcitag, reg, 0xffffffff); 265 sizedata = pci_conf_read(pc, pcitag, reg); 266 pci_conf_write(pc, pcitag, reg, addrdata); 267 splx(s); 268 269 if (PCI_MAPREG_TYPE(addrdata) == PCI_MAPREG_TYPE_IO) 270 panic("pci_find_mem: I/O region"); 271 272 switch (PCI_MAPREG_MEM_TYPE(addrdata)) { 273 case PCI_MAPREG_MEM_TYPE_32BIT: 274 case PCI_MAPREG_MEM_TYPE_32BIT_1M: 275 break; 276 case PCI_MAPREG_MEM_TYPE_64BIT: 277 /* XXX */ printf("pci_find_mem: 64-bit region\n"); 278 /* XXX */ return (1); 279 default: 280 printf("pci_find_mem: reserved region type\n"); 281 return (1); 282 } 283 284 if (membasep != NULL) 285 *membasep = PCI_MAPREG_MEM_ADDR(addrdata); /* PCI addr */ 286 if (memsizep != NULL) 287 *memsizep = PCI_MAPREG_MEM_SIZE(sizedata); 288 if (cacheablep != NULL) 289 *cacheablep = PCI_MAPREG_MEM_CACHEABLE(addrdata); 290 291 return 0; 292 } 293