1 /* $NetBSD: pci_machdep.c,v 1.32 2007/10/17 19:56:51 garbled 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 1.32 2007/10/17 19:56:51 garbled 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 <machine/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 94 pc->pc_conf_interrupt = genppc_pci_conf_interrupt; 95 pc->pc_decompose_tag = genppc_pci_indirect_decompose_tag; 96 pc->pc_conf_hook = prep_pci_conf_hook; 97 98 pc->pc_addr = mapiodev(prep_pci_baseaddr, 4); 99 pc->pc_data = mapiodev(prep_pci_basedata, 4); 100 pc->pc_bus = 0; 101 pc->pc_node = 0; 102 pc->pc_memt = 0; 103 pc->pc_iot = 0; 104 } 105 106 void 107 prep_pci_get_chipset_tag(pci_chipset_tag_t pc) 108 { 109 int i; 110 111 i = pci_chipset_tag_type(); 112 113 if (i == PCIBridgeIndirect || i == PCIBridgeRS6K) { 114 prep_pci_config_mode = 1; 115 prep_pci_get_chipset_tag_indirect(pc); 116 } else if (i == PCIBridgeDirect) { 117 prep_pci_get_chipset_tag_direct(pc); 118 prep_pci_config_mode = 0; 119 } else 120 panic("Unknown PCI chipset tag configuration method"); 121 } 122 123 int 124 prep_pci_bus_maxdevs(pci_chipset_tag_t pc, int busno) 125 { 126 struct genppc_pci_chipset_businfo *pbi; 127 prop_object_t busmax; 128 129 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 130 while (busno--) 131 pbi = SIMPLEQ_NEXT(pbi, next); 132 if (pbi == NULL) 133 return 32; 134 135 busmax = prop_dictionary_get(pbi->pbi_properties, 136 "prep-pcibus-maxdevices"); 137 if (busmax == NULL) 138 return 32; 139 else 140 return prop_number_integer_value(busmax); 141 142 return 32; 143 } 144 145 int 146 prep_pci_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp) 147 { 148 struct genppc_pci_chipset_businfo *pbi; 149 prop_dictionary_t dict, devsub; 150 prop_object_t pinsub; 151 prop_number_t pbus; 152 int busno, bus, pin, line, swiz, dev, origdev, i; 153 char key[20]; 154 155 pin = pa->pa_intrpin; 156 line = pa->pa_intrline; 157 bus = busno = pa->pa_bus; 158 swiz = pa->pa_intrswiz; 159 origdev = dev = pa->pa_device; 160 i = 0; 161 162 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 163 while (busno--) 164 pbi = SIMPLEQ_NEXT(pbi, next); 165 KASSERT(pbi != NULL); 166 167 dict = prop_dictionary_get(pbi->pbi_properties, "prep-pci-intrmap"); 168 169 if (dict != NULL) 170 i = prop_dictionary_count(dict); 171 172 if (dict == NULL || i == 0) { 173 /* We have a non-PReP bus. now it gets hard */ 174 pbus = prop_dictionary_get(pbi->pbi_properties, 175 "prep-pcibus-parent"); 176 if (pbus == NULL) 177 goto bad; 178 busno = prop_number_integer_value(pbus); 179 pbus = prop_dictionary_get(pbi->pbi_properties, 180 "prep-pcibus-rawdevnum"); 181 dev = prop_number_integer_value(pbus); 182 183 /* now that we know the parent bus, we need to find it's pbi */ 184 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 185 while (busno--) 186 pbi = SIMPLEQ_NEXT(pbi, next); 187 KASSERT(pbi != NULL); 188 189 /* swizzle the pin */ 190 pin = ((pin + origdev - 1) & 3) + 1; 191 192 /* now we have the pbi, ask for dict again */ 193 dict = prop_dictionary_get(pbi->pbi_properties, 194 "prep-pci-intrmap"); 195 if (dict == NULL) 196 goto bad; 197 } 198 199 /* No IRQ used. */ 200 if (pin == 0) 201 goto bad; 202 if (pin > 4) { 203 aprint_error("pci_intr_map: bad interrupt pin %d\n", pin); 204 goto bad; 205 } 206 207 sprintf(key, "devfunc-%d", dev); 208 devsub = prop_dictionary_get(dict, key); 209 if (devsub == NULL) 210 goto bad; 211 sprintf(key, "pin-%c", 'A' + (pin-1)); 212 pinsub = prop_dictionary_get(devsub, key); 213 if (pinsub == NULL) 214 goto bad; 215 line = prop_number_integer_value(pinsub); 216 217 /* 218 * Section 6.2.4, `Miscellaneous Functions', says that 255 means 219 * `unknown' or `no connection' on a PC. We assume that a device with 220 * `no connection' either doesn't have an interrupt (in which case the 221 * pin number should be 0, and would have been noticed above), or 222 * wasn't configured by the BIOS (in which case we punt, since there's 223 * no real way we can know how the interrupt lines are mapped in the 224 * hardware). 225 * 226 * XXX 227 * Since IRQ 0 is only used by the clock, and we can't actually be sure 228 * that the BIOS did its job, we also recognize that as meaning that 229 * the BIOS has not configured the device. 230 */ 231 if (line == 0 || line == 255) { 232 aprint_error("pci_intr_map: no mapping for pin %c\n", 233 '@' + pin); 234 goto bad; 235 } else { 236 if (line >= ICU_LEN) { 237 aprint_error("pci_intr_map: bad interrupt line %d\n", 238 line); 239 goto bad; 240 } 241 if (line == IRQ_SLAVE) { 242 aprint_verbose("pci_intr_map: changed line 2 to line 9\n"); 243 line = 9; 244 } 245 } 246 247 *ihp = line; 248 return 0; 249 250 bad: 251 *ihp = -1; 252 return 1; 253 } 254 255 extern pcitag_t prep_pci_direct_make_tag(void *, int, int, int); 256 extern pcitag_t genppc_pci_indirect_make_tag(void *, int, int, int); 257 extern pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int); 258 extern pcireg_t genppc_pci_indirect_conf_read(void *, pcitag_t, int); 259 260 int 261 prep_pci_conf_hook(pci_chipset_tag_t pct, int bus, int dev, int func, 262 pcireg_t id) 263 { 264 struct genppc_pci_chipset_businfo *pbi; 265 prop_number_t bmax, pbus; 266 pcitag_t tag; 267 pcireg_t class; 268 269 /* 270 * The P9100 board found in some IBM machines cannot be 271 * over-configured. 272 */ 273 if (PCI_VENDOR(id) == PCI_VENDOR_WEITEK && 274 PCI_PRODUCT(id) == PCI_PRODUCT_WEITEK_P9100) 275 return 0; 276 277 /* We have already mapped the MPIC2 if we have one, so leave it 278 alone */ 279 if (PCI_VENDOR(id) == PCI_VENDOR_IBM && 280 PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC2) 281 return 0; 282 283 if (PCI_VENDOR(id) == PCI_VENDOR_IBM && 284 PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC) 285 return 0; 286 287 if (PCI_VENDOR(id) == PCI_VENDOR_INTEL && 288 PCI_PRODUCT(id) == PCI_PRODUCT_INTEL_PCEB) 289 return 0; 290 291 if (PCI_VENDOR(id) == PCI_VENDOR_MOT && 292 PCI_PRODUCT(id) == PCI_PRODUCT_MOT_RAVEN) 293 return (PCI_CONF_ALL & ~PCI_CONF_MAP_MEM); 294 295 /* NOTE, all device specific stuff must be above this line */ 296 /* don't do this on the primary host bridge */ 297 if (bus == 0 && dev == 0 && func == 0) 298 return PCI_CONF_DEFAULT; 299 300 if (prep_pci_config_mode) { 301 tag = genppc_pci_indirect_make_tag(pct, bus, dev, func); 302 class = genppc_pci_indirect_conf_read(pct, tag, 303 PCI_CLASS_REG); 304 } else { 305 tag = prep_pci_direct_make_tag(pct, bus, dev, func); 306 class = prep_pci_direct_conf_read(pct, tag, 307 PCI_CLASS_REG); 308 } 309 310 /* 311 * PCI bridges have special needs. We need to discover where they 312 * came from, and wire them appropriately. 313 */ 314 if (PCI_CLASS(class) == PCI_CLASS_BRIDGE && 315 PCI_SUBCLASS(class) == PCI_SUBCLASS_BRIDGE_PCI) { 316 pbi = malloc(sizeof(struct genppc_pci_chipset_businfo), 317 M_DEVBUF, M_NOWAIT); 318 KASSERT(pbi != NULL); 319 pbi->pbi_properties = prop_dictionary_create(); 320 KASSERT(pbi->pbi_properties != NULL); 321 setup_pciintr_map(pbi, bus, dev, func); 322 323 /* record the parent bus, and the parent device number */ 324 pbus = prop_number_create_integer(bus); 325 prop_dictionary_set(pbi->pbi_properties, "prep-pcibus-parent", 326 pbus); 327 prop_object_release(pbus); 328 pbus = prop_number_create_integer(dev); 329 prop_dictionary_set(pbi->pbi_properties, 330 "prep-pcibus-rawdevnum", pbus); 331 prop_object_release(pbus); 332 333 /* now look for bus quirks */ 334 335 if (PCI_VENDOR(id) == PCI_VENDOR_DEC && 336 PCI_PRODUCT(id) == PCI_PRODUCT_DEC_21154) { 337 bmax = prop_number_create_integer(8); 338 KASSERT(bmax != NULL); 339 prop_dictionary_set(pbi->pbi_properties, 340 "prep-pcibus-maxdevices", bmax); 341 prop_object_release(bmax); 342 } 343 344 SIMPLEQ_INSERT_TAIL(&genppc_pct->pc_pbi, pbi, next); 345 } 346 347 return (PCI_CONF_DEFAULT); 348 } 349