1 /* $NetBSD: pci_machdep.c,v 1.44 2020/11/21 15:59:53 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1994 Charles M. 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 M. 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 * Machine-specific functions for PCI autoconfiguration. 35 * 36 * On PCs, there are two methods of generating PCI configuration cycles. 37 * We try to detect the appropriate mechanism for this machine and set 38 * up a few function pointers to access the correct method directly. 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: pci_machdep.c,v 1.44 2020/11/21 15:59:53 thorpej Exp $"); 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/systm.h> 48 #include <sys/errno.h> 49 #include <sys/extent.h> 50 #include <sys/device.h> 51 #include <sys/kmem.h> 52 53 #include <uvm/uvm_extern.h> 54 55 #define _POWERPC_BUS_DMA_PRIVATE 56 #include <sys/bus.h> 57 #include <machine/intr.h> 58 #include <machine/platform.h> 59 #include <machine/pnp.h> 60 61 #include <dev/isa/isavar.h> 62 63 #include <dev/pci/pcivar.h> 64 #include <dev/pci/pcireg.h> 65 #include <dev/pci/pcidevs.h> 66 #include <dev/pci/pciconf.h> 67 68 /* 0 == direct 1 == indirect */ 69 int prep_pci_config_mode = 1; 70 extern struct genppc_pci_chipset *genppc_pct; 71 extern u_int32_t prep_pci_baseaddr; 72 extern u_int32_t prep_pci_basedata; 73 74 static void 75 prep_pci_get_chipset_tag_indirect(pci_chipset_tag_t pc) 76 { 77 78 pc->pc_conf_v = (void *)pc; 79 80 pc->pc_attach_hook = genppc_pci_indirect_attach_hook; 81 pc->pc_bus_maxdevs = prep_pci_bus_maxdevs; 82 pc->pc_make_tag = genppc_pci_indirect_make_tag; 83 pc->pc_conf_read = genppc_pci_indirect_conf_read; 84 pc->pc_conf_write = genppc_pci_indirect_conf_write; 85 86 pc->pc_intr_v = (void *)pc; 87 88 pc->pc_intr_map = prep_pci_intr_map; 89 pc->pc_intr_string = genppc_pci_intr_string; 90 pc->pc_intr_evcnt = genppc_pci_intr_evcnt; 91 pc->pc_intr_establish = genppc_pci_intr_establish; 92 pc->pc_intr_disestablish = genppc_pci_intr_disestablish; 93 pc->pc_intr_setattr = genppc_pci_intr_setattr; 94 pc->pc_intr_type = genppc_pci_intr_type; 95 pc->pc_intr_alloc = genppc_pci_intr_alloc; 96 pc->pc_intr_release = genppc_pci_intr_release; 97 pc->pc_intx_alloc = genppc_pci_intx_alloc; 98 99 pc->pc_msi_v = (void *)pc; 100 genppc_pci_chipset_msi_init(pc); 101 102 pc->pc_msix_v = (void *)pc; 103 genppc_pci_chipset_msix_init(pc); 104 105 pc->pc_conf_interrupt = genppc_pci_conf_interrupt; 106 pc->pc_decompose_tag = genppc_pci_indirect_decompose_tag; 107 pc->pc_conf_hook = prep_pci_conf_hook; 108 109 pc->pc_addr = mapiodev(prep_pci_baseaddr, 4, false); 110 pc->pc_data = mapiodev(prep_pci_basedata, 4, false); 111 pc->pc_bus = 0; 112 pc->pc_node = 0; 113 pc->pc_memt = 0; 114 pc->pc_iot = 0; 115 } 116 117 void 118 prep_pci_get_chipset_tag(pci_chipset_tag_t pc) 119 { 120 int i; 121 122 i = pci_chipset_tag_type(); 123 124 if (i == PCIBridgeIndirect || i == PCIBridgeRS6K) { 125 prep_pci_config_mode = 1; 126 prep_pci_get_chipset_tag_indirect(pc); 127 } else if (i == PCIBridgeDirect) { 128 prep_pci_get_chipset_tag_direct(pc); 129 prep_pci_config_mode = 0; 130 } else 131 panic("Unknown PCI chipset tag configuration method"); 132 } 133 134 int 135 prep_pci_bus_maxdevs(void *v, int busno) 136 { 137 struct genppc_pci_chipset_businfo *pbi; 138 prop_object_t busmax; 139 140 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 141 while (busno--) 142 pbi = SIMPLEQ_NEXT(pbi, next); 143 if (pbi == NULL) 144 return 32; 145 146 busmax = prop_dictionary_get(pbi->pbi_properties, 147 "prep-pcibus-maxdevices"); 148 if (busmax == NULL) 149 return 32; 150 else 151 return prop_number_integer_value(busmax); 152 153 return 32; 154 } 155 156 int 157 prep_pci_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp) 158 { 159 struct genppc_pci_chipset_businfo *pbi; 160 prop_dictionary_t dict, devsub; 161 prop_object_t pinsub; 162 prop_number_t pbus; 163 int busno, pin, line, dev, origdev, i; 164 char key[20]; 165 166 pin = pa->pa_intrpin; 167 line = pa->pa_intrline; 168 busno = pa->pa_bus; 169 origdev = dev = pa->pa_device; 170 i = 0; 171 172 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 173 while (busno--) 174 pbi = SIMPLEQ_NEXT(pbi, next); 175 KASSERT(pbi != NULL); 176 177 dict = prop_dictionary_get(pbi->pbi_properties, "prep-pci-intrmap"); 178 179 if (dict != NULL) 180 i = prop_dictionary_count(dict); 181 182 if (dict == NULL || i == 0) { 183 /* We have a non-PReP bus. now it gets hard */ 184 pbus = prop_dictionary_get(pbi->pbi_properties, 185 "prep-pcibus-parent"); 186 if (pbus == NULL) 187 goto bad; 188 busno = prop_number_integer_value(pbus); 189 pbus = prop_dictionary_get(pbi->pbi_properties, 190 "prep-pcibus-rawdevnum"); 191 dev = prop_number_integer_value(pbus); 192 193 /* now that we know the parent bus, we need to find its pbi */ 194 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 195 while (busno--) 196 pbi = SIMPLEQ_NEXT(pbi, next); 197 KASSERT(pbi != NULL); 198 199 /* swizzle the pin */ 200 pin = ((pin + origdev - 1) & 3) + 1; 201 202 /* now we have the pbi, ask for dict again */ 203 dict = prop_dictionary_get(pbi->pbi_properties, 204 "prep-pci-intrmap"); 205 if (dict == NULL) 206 goto bad; 207 } 208 209 /* No IRQ used. */ 210 if (pin == 0) 211 goto bad; 212 if (pin > 4) { 213 aprint_error("pci_intr_map: bad interrupt pin %d\n", pin); 214 goto bad; 215 } 216 217 snprintf(key, sizeof(key), "devfunc-%d", dev); 218 devsub = prop_dictionary_get(dict, key); 219 if (devsub == NULL) 220 goto bad; 221 snprintf(key, sizeof(key), "pin-%c", 'A' + (pin-1)); 222 pinsub = prop_dictionary_get(devsub, key); 223 if (pinsub == NULL) 224 goto bad; 225 line = prop_number_integer_value(pinsub); 226 227 /* 228 * Section 6.2.4, `Miscellaneous Functions', says that 255 means 229 * `unknown' or `no connection' on a PC. We assume that a device with 230 * `no connection' either doesn't have an interrupt (in which case the 231 * pin number should be 0, and would have been noticed above), or 232 * wasn't configured by the BIOS (in which case we punt, since there's 233 * no real way we can know how the interrupt lines are mapped in the 234 * hardware). 235 * 236 * XXX 237 * Since IRQ 0 is only used by the clock, and we can't actually be sure 238 * that the BIOS did its job, we also recognize that as meaning that 239 * the BIOS has not configured the device. 240 */ 241 if (line == 0 || line == 255) { 242 aprint_error("pci_intr_map: no mapping for pin %c\n", 243 '@' + pin); 244 goto bad; 245 } else { 246 if (line >= ICU_LEN) { 247 aprint_error("pci_intr_map: bad interrupt line %d\n", 248 line); 249 goto bad; 250 } 251 if (line == IRQ_SLAVE) { 252 aprint_verbose("pci_intr_map: changed line 2 to line 9\n"); 253 line = 9; 254 } 255 } 256 257 *ihp = line; 258 return 0; 259 260 bad: 261 *ihp = -1; 262 return 1; 263 } 264 265 extern pcitag_t prep_pci_direct_make_tag(void *, int, int, int); 266 extern pcitag_t genppc_pci_indirect_make_tag(void *, int, int, int); 267 extern pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int); 268 extern pcireg_t genppc_pci_indirect_conf_read(void *, pcitag_t, int); 269 270 int 271 prep_pci_conf_hook(void *v, int bus, int dev, int func, pcireg_t id) 272 { 273 pci_chipset_tag_t pc = v; 274 struct genppc_pci_chipset_businfo *pbi; 275 prop_number_t bmax, pbus; 276 pcitag_t tag; 277 pcireg_t class; 278 279 /* 280 * The P9100 board found in some IBM machines cannot be 281 * over-configured. 282 */ 283 if (PCI_VENDOR(id) == PCI_VENDOR_WEITEK && 284 PCI_PRODUCT(id) == PCI_PRODUCT_WEITEK_P9100) 285 return 0; 286 287 /* We have already mapped the MPIC2 if we have one, so leave it 288 alone */ 289 if (PCI_VENDOR(id) == PCI_VENDOR_IBM && 290 PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC2) 291 return 0; 292 293 if (PCI_VENDOR(id) == PCI_VENDOR_IBM && 294 PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC) 295 return 0; 296 297 if (PCI_VENDOR(id) == PCI_VENDOR_INTEL && 298 PCI_PRODUCT(id) == PCI_PRODUCT_INTEL_PCEB) 299 return 0; 300 301 if (PCI_VENDOR(id) == PCI_VENDOR_MOT && 302 PCI_PRODUCT(id) == PCI_PRODUCT_MOT_RAVEN) 303 return (PCI_CONF_ALL & ~PCI_CONF_MAP_MEM); 304 305 /* NOTE, all device specific stuff must be above this line */ 306 /* don't do this on the primary host bridge */ 307 if (bus == 0 && dev == 0 && func == 0) 308 return PCI_CONF_DEFAULT; 309 310 if (prep_pci_config_mode) { 311 tag = genppc_pci_indirect_make_tag(pc, bus, dev, func); 312 class = genppc_pci_indirect_conf_read(pc, tag, 313 PCI_CLASS_REG); 314 } else { 315 tag = prep_pci_direct_make_tag(pc, bus, dev, func); 316 class = prep_pci_direct_conf_read(pc, tag, 317 PCI_CLASS_REG); 318 } 319 320 /* 321 * PCI bridges have special needs. We need to discover where they 322 * came from, and wire them appropriately. 323 */ 324 if (PCI_CLASS(class) == PCI_CLASS_BRIDGE && 325 PCI_SUBCLASS(class) == PCI_SUBCLASS_BRIDGE_PCI) { 326 pbi = kmem_alloc(sizeof(struct genppc_pci_chipset_businfo), 327 KM_SLEEP); 328 pbi->pbi_properties = prop_dictionary_create(); 329 KASSERT(pbi->pbi_properties != NULL); 330 setup_pciintr_map(pbi, bus, dev, func); 331 332 /* record the parent bus, and the parent device number */ 333 pbus = prop_number_create_integer(bus); 334 prop_dictionary_set(pbi->pbi_properties, "prep-pcibus-parent", 335 pbus); 336 prop_object_release(pbus); 337 pbus = prop_number_create_integer(dev); 338 prop_dictionary_set(pbi->pbi_properties, 339 "prep-pcibus-rawdevnum", pbus); 340 prop_object_release(pbus); 341 342 /* now look for bus quirks */ 343 344 if (PCI_VENDOR(id) == PCI_VENDOR_DEC && 345 PCI_PRODUCT(id) == PCI_PRODUCT_DEC_21154) { 346 bmax = prop_number_create_integer(8); 347 KASSERT(bmax != NULL); 348 prop_dictionary_set(pbi->pbi_properties, 349 "prep-pcibus-maxdevices", bmax); 350 prop_object_release(bmax); 351 } 352 353 SIMPLEQ_INSERT_TAIL(&genppc_pct->pc_pbi, pbi, next); 354 } 355 356 return (PCI_CONF_DEFAULT); 357 } 358
Indexes created Sat Sep 20 22:09:52 GMT 2025