1 /* $NetBSD: pci_machdep.c,v 1.38 2011/10/13 19:51:17 matt 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 1.38 2011/10/13 19:51:17 matt 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/malloc.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 95 pc->pc_msi_v = (void *)pc; 96 genppc_pci_chipset_msi_init(pc); 97 98 pc->pc_conf_interrupt = genppc_pci_conf_interrupt; 99 pc->pc_decompose_tag = genppc_pci_indirect_decompose_tag; 100 pc->pc_conf_hook = prep_pci_conf_hook; 101 102 pc->pc_addr = mapiodev(prep_pci_baseaddr, 4, false); 103 pc->pc_data = mapiodev(prep_pci_basedata, 4, false); 104 pc->pc_bus = 0; 105 pc->pc_node = 0; 106 pc->pc_memt = 0; 107 pc->pc_iot = 0; 108 } 109 110 void 111 prep_pci_get_chipset_tag(pci_chipset_tag_t pc) 112 { 113 int i; 114 115 i = pci_chipset_tag_type(); 116 117 if (i == PCIBridgeIndirect || i == PCIBridgeRS6K) { 118 prep_pci_config_mode = 1; 119 prep_pci_get_chipset_tag_indirect(pc); 120 } else if (i == PCIBridgeDirect) { 121 prep_pci_get_chipset_tag_direct(pc); 122 prep_pci_config_mode = 0; 123 } else 124 panic("Unknown PCI chipset tag configuration method"); 125 } 126 127 int 128 prep_pci_bus_maxdevs(void *v, int busno) 129 { 130 struct genppc_pci_chipset_businfo *pbi; 131 prop_object_t busmax; 132 133 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 134 while (busno--) 135 pbi = SIMPLEQ_NEXT(pbi, next); 136 if (pbi == NULL) 137 return 32; 138 139 busmax = prop_dictionary_get(pbi->pbi_properties, 140 "prep-pcibus-maxdevices"); 141 if (busmax == NULL) 142 return 32; 143 else 144 return prop_number_integer_value(busmax); 145 146 return 32; 147 } 148 149 int 150 prep_pci_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp) 151 { 152 struct genppc_pci_chipset_businfo *pbi; 153 prop_dictionary_t dict, devsub; 154 prop_object_t pinsub; 155 prop_number_t pbus; 156 int busno, bus, pin, line, swiz, dev, origdev, i; 157 char key[20]; 158 159 pin = pa->pa_intrpin; 160 line = pa->pa_intrline; 161 bus = busno = pa->pa_bus; 162 swiz = pa->pa_intrswiz; 163 origdev = dev = pa->pa_device; 164 i = 0; 165 166 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 167 while (busno--) 168 pbi = SIMPLEQ_NEXT(pbi, next); 169 KASSERT(pbi != NULL); 170 171 dict = prop_dictionary_get(pbi->pbi_properties, "prep-pci-intrmap"); 172 173 if (dict != NULL) 174 i = prop_dictionary_count(dict); 175 176 if (dict == NULL || i == 0) { 177 /* We have a non-PReP bus. now it gets hard */ 178 pbus = prop_dictionary_get(pbi->pbi_properties, 179 "prep-pcibus-parent"); 180 if (pbus == NULL) 181 goto bad; 182 busno = prop_number_integer_value(pbus); 183 pbus = prop_dictionary_get(pbi->pbi_properties, 184 "prep-pcibus-rawdevnum"); 185 dev = prop_number_integer_value(pbus); 186 187 /* now that we know the parent bus, we need to find it's pbi */ 188 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 189 while (busno--) 190 pbi = SIMPLEQ_NEXT(pbi, next); 191 KASSERT(pbi != NULL); 192 193 /* swizzle the pin */ 194 pin = ((pin + origdev - 1) & 3) + 1; 195 196 /* now we have the pbi, ask for dict again */ 197 dict = prop_dictionary_get(pbi->pbi_properties, 198 "prep-pci-intrmap"); 199 if (dict == NULL) 200 goto bad; 201 } 202 203 /* No IRQ used. */ 204 if (pin == 0) 205 goto bad; 206 if (pin > 4) { 207 aprint_error("pci_intr_map: bad interrupt pin %d\n", pin); 208 goto bad; 209 } 210 211 sprintf(key, "devfunc-%d", dev); 212 devsub = prop_dictionary_get(dict, key); 213 if (devsub == NULL) 214 goto bad; 215 sprintf(key, "pin-%c", 'A' + (pin-1)); 216 pinsub = prop_dictionary_get(devsub, key); 217 if (pinsub == NULL) 218 goto bad; 219 line = prop_number_integer_value(pinsub); 220 221 /* 222 * Section 6.2.4, `Miscellaneous Functions', says that 255 means 223 * `unknown' or `no connection' on a PC. We assume that a device with 224 * `no connection' either doesn't have an interrupt (in which case the 225 * pin number should be 0, and would have been noticed above), or 226 * wasn't configured by the BIOS (in which case we punt, since there's 227 * no real way we can know how the interrupt lines are mapped in the 228 * hardware). 229 * 230 * XXX 231 * Since IRQ 0 is only used by the clock, and we can't actually be sure 232 * that the BIOS did its job, we also recognize that as meaning that 233 * the BIOS has not configured the device. 234 */ 235 if (line == 0 || line == 255) { 236 aprint_error("pci_intr_map: no mapping for pin %c\n", 237 '@' + pin); 238 goto bad; 239 } else { 240 if (line >= ICU_LEN) { 241 aprint_error("pci_intr_map: bad interrupt line %d\n", 242 line); 243 goto bad; 244 } 245 if (line == IRQ_SLAVE) { 246 aprint_verbose("pci_intr_map: changed line 2 to line 9\n"); 247 line = 9; 248 } 249 } 250 251 *ihp = line; 252 return 0; 253 254 bad: 255 *ihp = -1; 256 return 1; 257 } 258 259 extern pcitag_t prep_pci_direct_make_tag(void *, int, int, int); 260 extern pcitag_t genppc_pci_indirect_make_tag(void *, int, int, int); 261 extern pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int); 262 extern pcireg_t genppc_pci_indirect_conf_read(void *, pcitag_t, int); 263 264 int 265 prep_pci_conf_hook(void *v, int bus, int dev, int func, pcireg_t id) 266 { 267 pci_chipset_tag_t pc = v; 268 struct genppc_pci_chipset_businfo *pbi; 269 prop_number_t bmax, pbus; 270 pcitag_t tag; 271 pcireg_t class; 272 273 /* 274 * The P9100 board found in some IBM machines cannot be 275 * over-configured. 276 */ 277 if (PCI_VENDOR(id) == PCI_VENDOR_WEITEK && 278 PCI_PRODUCT(id) == PCI_PRODUCT_WEITEK_P9100) 279 return 0; 280 281 /* We have already mapped the MPIC2 if we have one, so leave it 282 alone */ 283 if (PCI_VENDOR(id) == PCI_VENDOR_IBM && 284 PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC2) 285 return 0; 286 287 if (PCI_VENDOR(id) == PCI_VENDOR_IBM && 288 PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC) 289 return 0; 290 291 if (PCI_VENDOR(id) == PCI_VENDOR_INTEL && 292 PCI_PRODUCT(id) == PCI_PRODUCT_INTEL_PCEB) 293 return 0; 294 295 if (PCI_VENDOR(id) == PCI_VENDOR_MOT && 296 PCI_PRODUCT(id) == PCI_PRODUCT_MOT_RAVEN) 297 return (PCI_CONF_ALL & ~PCI_CONF_MAP_MEM); 298 299 /* NOTE, all device specific stuff must be above this line */ 300 /* don't do this on the primary host bridge */ 301 if (bus == 0 && dev == 0 && func == 0) 302 return PCI_CONF_DEFAULT; 303 304 if (prep_pci_config_mode) { 305 tag = genppc_pci_indirect_make_tag(pc, bus, dev, func); 306 class = genppc_pci_indirect_conf_read(pc, tag, 307 PCI_CLASS_REG); 308 } else { 309 tag = prep_pci_direct_make_tag(pc, bus, dev, func); 310 class = prep_pci_direct_conf_read(pc, tag, 311 PCI_CLASS_REG); 312 } 313 314 /* 315 * PCI bridges have special needs. We need to discover where they 316 * came from, and wire them appropriately. 317 */ 318 if (PCI_CLASS(class) == PCI_CLASS_BRIDGE && 319 PCI_SUBCLASS(class) == PCI_SUBCLASS_BRIDGE_PCI) { 320 pbi = malloc(sizeof(struct genppc_pci_chipset_businfo), 321 M_DEVBUF, M_NOWAIT); 322 KASSERT(pbi != NULL); 323 pbi->pbi_properties = prop_dictionary_create(); 324 KASSERT(pbi->pbi_properties != NULL); 325 setup_pciintr_map(pbi, bus, dev, func); 326 327 /* record the parent bus, and the parent device number */ 328 pbus = prop_number_create_integer(bus); 329 prop_dictionary_set(pbi->pbi_properties, "prep-pcibus-parent", 330 pbus); 331 prop_object_release(pbus); 332 pbus = prop_number_create_integer(dev); 333 prop_dictionary_set(pbi->pbi_properties, 334 "prep-pcibus-rawdevnum", pbus); 335 prop_object_release(pbus); 336 337 /* now look for bus quirks */ 338 339 if (PCI_VENDOR(id) == PCI_VENDOR_DEC && 340 PCI_PRODUCT(id) == PCI_PRODUCT_DEC_21154) { 341 bmax = prop_number_create_integer(8); 342 KASSERT(bmax != NULL); 343 prop_dictionary_set(pbi->pbi_properties, 344 "prep-pcibus-maxdevices", bmax); 345 prop_object_release(bmax); 346 } 347 348 SIMPLEQ_INSERT_TAIL(&genppc_pct->pc_pbi, pbi, next); 349 } 350 351 return (PCI_CONF_DEFAULT); 352 } 353