1 /* $NetBSD: pci_machdep.c,v 1.37 2011/07/01 16:56:52 dyoung 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 1.37 2011/07/01 16:56:52 dyoung 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_conf_interrupt = genppc_pci_conf_interrupt; 96 pc->pc_decompose_tag = genppc_pci_indirect_decompose_tag; 97 pc->pc_conf_hook = prep_pci_conf_hook; 98 99 pc->pc_addr = mapiodev(prep_pci_baseaddr, 4, false); 100 pc->pc_data = mapiodev(prep_pci_basedata, 4, false); 101 pc->pc_bus = 0; 102 pc->pc_node = 0; 103 pc->pc_memt = 0; 104 pc->pc_iot = 0; 105 } 106 107 void 108 prep_pci_get_chipset_tag(pci_chipset_tag_t pc) 109 { 110 int i; 111 112 i = pci_chipset_tag_type(); 113 114 if (i == PCIBridgeIndirect || i == PCIBridgeRS6K) { 115 prep_pci_config_mode = 1; 116 prep_pci_get_chipset_tag_indirect(pc); 117 } else if (i == PCIBridgeDirect) { 118 prep_pci_get_chipset_tag_direct(pc); 119 prep_pci_config_mode = 0; 120 } else 121 panic("Unknown PCI chipset tag configuration method"); 122 } 123 124 int 125 prep_pci_bus_maxdevs(void *v, int busno) 126 { 127 struct genppc_pci_chipset_businfo *pbi; 128 prop_object_t busmax; 129 130 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 131 while (busno--) 132 pbi = SIMPLEQ_NEXT(pbi, next); 133 if (pbi == NULL) 134 return 32; 135 136 busmax = prop_dictionary_get(pbi->pbi_properties, 137 "prep-pcibus-maxdevices"); 138 if (busmax == NULL) 139 return 32; 140 else 141 return prop_number_integer_value(busmax); 142 143 return 32; 144 } 145 146 int 147 prep_pci_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp) 148 { 149 struct genppc_pci_chipset_businfo *pbi; 150 prop_dictionary_t dict, devsub; 151 prop_object_t pinsub; 152 prop_number_t pbus; 153 int busno, bus, pin, line, swiz, dev, origdev, i; 154 char key[20]; 155 156 pin = pa->pa_intrpin; 157 line = pa->pa_intrline; 158 bus = busno = pa->pa_bus; 159 swiz = pa->pa_intrswiz; 160 origdev = dev = pa->pa_device; 161 i = 0; 162 163 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 164 while (busno--) 165 pbi = SIMPLEQ_NEXT(pbi, next); 166 KASSERT(pbi != NULL); 167 168 dict = prop_dictionary_get(pbi->pbi_properties, "prep-pci-intrmap"); 169 170 if (dict != NULL) 171 i = prop_dictionary_count(dict); 172 173 if (dict == NULL || i == 0) { 174 /* We have a non-PReP bus. now it gets hard */ 175 pbus = prop_dictionary_get(pbi->pbi_properties, 176 "prep-pcibus-parent"); 177 if (pbus == NULL) 178 goto bad; 179 busno = prop_number_integer_value(pbus); 180 pbus = prop_dictionary_get(pbi->pbi_properties, 181 "prep-pcibus-rawdevnum"); 182 dev = prop_number_integer_value(pbus); 183 184 /* now that we know the parent bus, we need to find it's pbi */ 185 pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi); 186 while (busno--) 187 pbi = SIMPLEQ_NEXT(pbi, next); 188 KASSERT(pbi != NULL); 189 190 /* swizzle the pin */ 191 pin = ((pin + origdev - 1) & 3) + 1; 192 193 /* now we have the pbi, ask for dict again */ 194 dict = prop_dictionary_get(pbi->pbi_properties, 195 "prep-pci-intrmap"); 196 if (dict == NULL) 197 goto bad; 198 } 199 200 /* No IRQ used. */ 201 if (pin == 0) 202 goto bad; 203 if (pin > 4) { 204 aprint_error("pci_intr_map: bad interrupt pin %d\n", pin); 205 goto bad; 206 } 207 208 sprintf(key, "devfunc-%d", dev); 209 devsub = prop_dictionary_get(dict, key); 210 if (devsub == NULL) 211 goto bad; 212 sprintf(key, "pin-%c", 'A' + (pin-1)); 213 pinsub = prop_dictionary_get(devsub, key); 214 if (pinsub == NULL) 215 goto bad; 216 line = prop_number_integer_value(pinsub); 217 218 /* 219 * Section 6.2.4, `Miscellaneous Functions', says that 255 means 220 * `unknown' or `no connection' on a PC. We assume that a device with 221 * `no connection' either doesn't have an interrupt (in which case the 222 * pin number should be 0, and would have been noticed above), or 223 * wasn't configured by the BIOS (in which case we punt, since there's 224 * no real way we can know how the interrupt lines are mapped in the 225 * hardware). 226 * 227 * XXX 228 * Since IRQ 0 is only used by the clock, and we can't actually be sure 229 * that the BIOS did its job, we also recognize that as meaning that 230 * the BIOS has not configured the device. 231 */ 232 if (line == 0 || line == 255) { 233 aprint_error("pci_intr_map: no mapping for pin %c\n", 234 '@' + pin); 235 goto bad; 236 } else { 237 if (line >= ICU_LEN) { 238 aprint_error("pci_intr_map: bad interrupt line %d\n", 239 line); 240 goto bad; 241 } 242 if (line == IRQ_SLAVE) { 243 aprint_verbose("pci_intr_map: changed line 2 to line 9\n"); 244 line = 9; 245 } 246 } 247 248 *ihp = line; 249 return 0; 250 251 bad: 252 *ihp = -1; 253 return 1; 254 } 255 256 extern pcitag_t prep_pci_direct_make_tag(void *, int, int, int); 257 extern pcitag_t genppc_pci_indirect_make_tag(void *, int, int, int); 258 extern pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int); 259 extern pcireg_t genppc_pci_indirect_conf_read(void *, pcitag_t, int); 260 261 int 262 prep_pci_conf_hook(void *v, int bus, int dev, int func, pcireg_t id) 263 { 264 pci_chipset_tag_t pc = v; 265 struct genppc_pci_chipset_businfo *pbi; 266 prop_number_t bmax, pbus; 267 pcitag_t tag; 268 pcireg_t class; 269 270 /* 271 * The P9100 board found in some IBM machines cannot be 272 * over-configured. 273 */ 274 if (PCI_VENDOR(id) == PCI_VENDOR_WEITEK && 275 PCI_PRODUCT(id) == PCI_PRODUCT_WEITEK_P9100) 276 return 0; 277 278 /* We have already mapped the MPIC2 if we have one, so leave it 279 alone */ 280 if (PCI_VENDOR(id) == PCI_VENDOR_IBM && 281 PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC2) 282 return 0; 283 284 if (PCI_VENDOR(id) == PCI_VENDOR_IBM && 285 PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC) 286 return 0; 287 288 if (PCI_VENDOR(id) == PCI_VENDOR_INTEL && 289 PCI_PRODUCT(id) == PCI_PRODUCT_INTEL_PCEB) 290 return 0; 291 292 if (PCI_VENDOR(id) == PCI_VENDOR_MOT && 293 PCI_PRODUCT(id) == PCI_PRODUCT_MOT_RAVEN) 294 return (PCI_CONF_ALL & ~PCI_CONF_MAP_MEM); 295 296 /* NOTE, all device specific stuff must be above this line */ 297 /* don't do this on the primary host bridge */ 298 if (bus == 0 && dev == 0 && func == 0) 299 return PCI_CONF_DEFAULT; 300 301 if (prep_pci_config_mode) { 302 tag = genppc_pci_indirect_make_tag(pc, bus, dev, func); 303 class = genppc_pci_indirect_conf_read(pc, tag, 304 PCI_CLASS_REG); 305 } else { 306 tag = prep_pci_direct_make_tag(pc, bus, dev, func); 307 class = prep_pci_direct_conf_read(pc, tag, 308 PCI_CLASS_REG); 309 } 310 311 /* 312 * PCI bridges have special needs. We need to discover where they 313 * came from, and wire them appropriately. 314 */ 315 if (PCI_CLASS(class) == PCI_CLASS_BRIDGE && 316 PCI_SUBCLASS(class) == PCI_SUBCLASS_BRIDGE_PCI) { 317 pbi = malloc(sizeof(struct genppc_pci_chipset_businfo), 318 M_DEVBUF, M_NOWAIT); 319 KASSERT(pbi != NULL); 320 pbi->pbi_properties = prop_dictionary_create(); 321 KASSERT(pbi->pbi_properties != NULL); 322 setup_pciintr_map(pbi, bus, dev, func); 323 324 /* record the parent bus, and the parent device number */ 325 pbus = prop_number_create_integer(bus); 326 prop_dictionary_set(pbi->pbi_properties, "prep-pcibus-parent", 327 pbus); 328 prop_object_release(pbus); 329 pbus = prop_number_create_integer(dev); 330 prop_dictionary_set(pbi->pbi_properties, 331 "prep-pcibus-rawdevnum", pbus); 332 prop_object_release(pbus); 333 334 /* now look for bus quirks */ 335 336 if (PCI_VENDOR(id) == PCI_VENDOR_DEC && 337 PCI_PRODUCT(id) == PCI_PRODUCT_DEC_21154) { 338 bmax = prop_number_create_integer(8); 339 KASSERT(bmax != NULL); 340 prop_dictionary_set(pbi->pbi_properties, 341 "prep-pcibus-maxdevices", bmax); 342 prop_object_release(bmax); 343 } 344 345 SIMPLEQ_INSERT_TAIL(&genppc_pct->pc_pbi, pbi, next); 346 } 347 348 return (PCI_CONF_DEFAULT); 349 } 350