1 /*- 2 * Copyright 1998 Massachusetts Institute of Technology 3 * Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>. 4 * Copyright 2006 by Marius Strobl <marius@FreeBSD.org>. 5 * All rights reserved. 6 * 7 * Permission to use, copy, modify, and distribute this software and 8 * its documentation for any purpose and without fee is hereby 9 * granted, provided that both the above copyright notice and this 10 * permission notice appear in all copies, that both the above 11 * copyright notice and this permission notice appear in all 12 * supporting documentation, and that the name of M.I.T. not be used 13 * in advertising or publicity pertaining to distribution of the 14 * software without specific, written prior permission. M.I.T. makes 15 * no representations about the suitability of this software for any 16 * purpose. It is provided "as is" without express or implied 17 * warranty. 18 * 19 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 20 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 21 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 23 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 26 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/endian.h> 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/bus.h> 42 #include <sys/kdb.h> 43 #include <sys/kernel.h> 44 #include <sys/malloc.h> 45 #include <sys/module.h> 46 #include <sys/pcpu.h> 47 #include <sys/rman.h> 48 #include <sys/smp.h> 49 50 #include <vm/vm.h> 51 #include <vm/pmap.h> 52 53 #include <dev/ofw/ofw_bus.h> 54 #include <dev/ofw/ofw_bus_subr.h> 55 #include <dev/ofw/openfirm.h> 56 57 #include <machine/bus.h> 58 #include <machine/intr_machdep.h> 59 #include <machine/resource.h> 60 61 /* 62 * The nexus handles root-level resource allocation requests and interrupt 63 * mapping. All direct subdevices of nexus are attached by DEVICE_IDENTIFY(). 64 */ 65 66 static struct rman intr_rman; 67 static struct rman mem_rman; 68 69 static device_probe_t nexus_probe; 70 static device_attach_t nexus_attach; 71 static bus_setup_intr_t nexus_setup_intr; 72 static bus_teardown_intr_t nexus_teardown_intr; 73 static bus_alloc_resource_t nexus_alloc_resource; 74 static bus_activate_resource_t nexus_activate_resource; 75 static bus_deactivate_resource_t nexus_deactivate_resource; 76 static bus_adjust_resource_t nexus_adjust_resource; 77 static bus_release_resource_t nexus_release_resource; 78 static int nexus_map_resource(device_t bus, device_t child, int type, 79 struct resource *r, 80 struct resource_map_request *argsp, 81 struct resource_map *map); 82 static int nexus_unmap_resource(device_t bus, device_t child, int type, 83 struct resource *r, struct resource_map *map); 84 85 static bus_space_tag_t nexus_get_bus_tag(device_t, device_t); 86 static int nexus_get_cpus(device_t, device_t, enum cpu_sets, size_t, 87 cpuset_t *); 88 #ifdef SMP 89 static bus_bind_intr_t nexus_bind_intr; 90 #endif 91 static bus_config_intr_t nexus_config_intr; 92 static ofw_bus_map_intr_t nexus_ofw_map_intr; 93 94 static device_method_t nexus_methods[] = { 95 /* Device interface */ 96 DEVMETHOD(device_probe, nexus_probe), 97 DEVMETHOD(device_attach, nexus_attach), 98 99 /* Bus interface */ 100 DEVMETHOD(bus_add_child, bus_generic_add_child), 101 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 102 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 103 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 104 DEVMETHOD(bus_adjust_resource, nexus_adjust_resource), 105 DEVMETHOD(bus_release_resource, nexus_release_resource), 106 DEVMETHOD(bus_map_resource, nexus_map_resource), 107 DEVMETHOD(bus_unmap_resource, nexus_unmap_resource), 108 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 109 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 110 #ifdef SMP 111 DEVMETHOD(bus_bind_intr, nexus_bind_intr), 112 #endif 113 DEVMETHOD(bus_config_intr, nexus_config_intr), 114 DEVMETHOD(bus_get_bus_tag, nexus_get_bus_tag), 115 DEVMETHOD(bus_get_cpus, nexus_get_cpus), 116 117 /* ofw_bus interface */ 118 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr), 119 120 DEVMETHOD_END 121 }; 122 123 DEFINE_CLASS_0(nexus, nexus_driver, nexus_methods, 1); 124 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, 0, 0, BUS_PASS_BUS); 125 MODULE_VERSION(nexus, 1); 126 127 static int 128 nexus_probe(device_t dev) 129 { 130 131 device_quiet(dev); /* suppress attach message for neatness */ 132 133 return (BUS_PROBE_DEFAULT); 134 } 135 136 static int 137 nexus_attach(device_t dev) 138 { 139 140 intr_rman.rm_type = RMAN_ARRAY; 141 intr_rman.rm_descr = "Interrupts"; 142 mem_rman.rm_type = RMAN_ARRAY; 143 mem_rman.rm_descr = "I/O memory addresses"; 144 if (rman_init(&intr_rman) != 0 || rman_init(&mem_rman) != 0 || 145 rman_manage_region(&intr_rman, 0, ~0) != 0 || 146 rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR) != 0) 147 panic("%s: failed to set up rmans.", __func__); 148 149 bus_generic_probe(dev); 150 bus_generic_attach(dev); 151 152 return (0); 153 } 154 155 static int 156 nexus_setup_intr(device_t bus __unused, device_t child, struct resource *r, 157 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, 158 void **cookiep) 159 { 160 int error, domain; 161 162 if (r == NULL) 163 panic("%s: NULL interrupt resource!", __func__); 164 165 if (cookiep != NULL) 166 *cookiep = NULL; 167 if ((rman_get_flags(r) & RF_SHAREABLE) == 0) 168 flags |= INTR_EXCL; 169 170 /* We depend here on rman_activate_resource() being idempotent. */ 171 error = rman_activate_resource(r); 172 if (error) 173 return (error); 174 175 if (bus_get_domain(child, &domain) != 0) { 176 if(bootverbose) 177 device_printf(child, "no domain found\n"); 178 domain = 0; 179 } 180 error = powerpc_setup_intr(device_get_nameunit(child), 181 rman_get_start(r), filt, intr, arg, flags, cookiep, domain); 182 183 return (error); 184 } 185 186 static int 187 nexus_teardown_intr(device_t bus __unused, device_t child __unused, 188 struct resource *r, void *ih) 189 { 190 191 if (r == NULL) 192 return (EINVAL); 193 194 return (powerpc_teardown_intr(ih)); 195 } 196 197 static bus_space_tag_t 198 nexus_get_bus_tag(device_t bus __unused, device_t child __unused) 199 { 200 201 #if BYTE_ORDER == LITTLE_ENDIAN 202 return(&bs_le_tag); 203 #else 204 return(&bs_be_tag); 205 #endif 206 } 207 208 static int 209 nexus_get_cpus(device_t dev, device_t child, enum cpu_sets op, size_t setsize, 210 cpuset_t *cpuset) 211 { 212 213 switch (op) { 214 #ifdef SMP 215 case INTR_CPUS: 216 if (setsize != sizeof(cpuset_t)) 217 return (EINVAL); 218 *cpuset = all_cpus; 219 return (0); 220 #endif 221 default: 222 return (bus_generic_get_cpus(dev, child, op, setsize, cpuset)); 223 } 224 } 225 226 #ifdef SMP 227 static int 228 nexus_bind_intr(device_t bus __unused, device_t child __unused, 229 struct resource *r, int cpu) 230 { 231 232 return (powerpc_bind_intr(rman_get_start(r), cpu)); 233 } 234 #endif 235 236 static int 237 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 238 enum intr_polarity pol) 239 { 240 241 return (powerpc_config_intr(irq, trig, pol)); 242 } 243 244 static int 245 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells, 246 pcell_t *irq) 247 { 248 u_int intr = MAP_IRQ(iparent, irq[0]); 249 if (icells > 1) 250 powerpc_fw_config_intr(intr, irq[1]); 251 return (intr); 252 } 253 254 /* 255 * Allocate a resource on behalf of child. NB: child is usually going to be a 256 * child of one of our descendants, not a direct child of nexus0. 257 */ 258 static struct resource * 259 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 260 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 261 { 262 struct rman *rm; 263 struct resource *rv; 264 265 switch (type) { 266 case SYS_RES_IRQ: 267 rm = &intr_rman; 268 break; 269 case SYS_RES_MEMORY: 270 rm = &mem_rman; 271 break; 272 default: 273 return (NULL); 274 } 275 276 rv = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE, 277 child); 278 if (rv == NULL) 279 return (NULL); 280 rman_set_rid(rv, *rid); 281 282 if ((flags & RF_ACTIVE) != 0) { 283 if (bus_activate_resource(child, type, *rid, rv) != 0) { 284 rman_release_resource(rv); 285 return (NULL); 286 } 287 } 288 289 return (rv); 290 } 291 292 static int 293 nexus_activate_resource(device_t bus __unused, device_t child __unused, 294 int type, int rid __unused, struct resource *r) 295 { 296 297 if (type == SYS_RES_MEMORY) { 298 vm_paddr_t start; 299 void *p; 300 301 start = (vm_paddr_t) rman_get_start(r); 302 if (bootverbose) 303 printf("nexus mapdev: start %jx, len %jd\n", 304 (uintmax_t)start, rman_get_size(r)); 305 306 p = pmap_mapdev(start, (vm_size_t) rman_get_size(r)); 307 if (p == NULL) 308 return (ENOMEM); 309 rman_set_virtual(r, p); 310 rman_set_bustag(r, &bs_be_tag); 311 rman_set_bushandle(r, (u_long)p); 312 } 313 return (rman_activate_resource(r)); 314 } 315 316 static int 317 nexus_deactivate_resource(device_t bus __unused, device_t child __unused, 318 int type __unused, int rid __unused, struct resource *r) 319 { 320 321 /* 322 * If this is a memory resource, unmap it. 323 */ 324 if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) { 325 bus_size_t psize; 326 327 psize = rman_get_size(r); 328 pmap_unmapdev(rman_get_virtual(r), psize); 329 } 330 331 return (rman_deactivate_resource(r)); 332 } 333 334 static int 335 nexus_adjust_resource(device_t bus, device_t child __unused, int type, 336 struct resource *r, rman_res_t start, rman_res_t end) 337 { 338 struct rman *rm; 339 340 switch (type) { 341 case SYS_RES_IRQ: 342 rm = &intr_rman; 343 break; 344 case SYS_RES_MEMORY: 345 rm = &mem_rman; 346 break; 347 default: 348 return (EINVAL); 349 } 350 if (rm == NULL) 351 return (ENXIO); 352 if (rman_is_region_manager(r, rm) == 0) 353 return (EINVAL); 354 return (rman_adjust_resource(r, start, end)); 355 } 356 357 static int 358 nexus_release_resource(device_t bus, device_t child, int type, 359 int rid, struct resource *r) 360 { 361 int error; 362 363 if ((rman_get_flags(r) & RF_ACTIVE) != 0) { 364 error = bus_deactivate_resource(child, type, rid, r); 365 if (error) 366 return (error); 367 } 368 return (rman_release_resource(r)); 369 } 370 371 static int 372 nexus_map_resource(device_t bus, device_t child, int type, struct resource *r, 373 struct resource_map_request *argsp, struct resource_map *map) 374 { 375 376 struct resource_map_request args; 377 rman_res_t end, length, start; 378 379 /* Resources must be active to be mapped. */ 380 if (!(rman_get_flags(r) & RF_ACTIVE)) 381 return (ENXIO); 382 383 /* Mappings are only supported on I/O and memory resources. */ 384 switch (type) { 385 case SYS_RES_IOPORT: 386 case SYS_RES_MEMORY: 387 break; 388 default: 389 return (EINVAL); 390 } 391 392 resource_init_map_request(&args); 393 if (argsp != NULL) 394 bcopy(argsp, &args, imin(argsp->size, args.size)); 395 396 start = rman_get_start(r) + args.offset; 397 if (args.length == 0) 398 length = rman_get_size(r); 399 else 400 length = args.length; 401 402 end = start + length - 1; 403 if (start > rman_get_end(r) || start < rman_get_start(r)) 404 return (EINVAL); 405 406 if (end > rman_get_end(r) || end < start) 407 return (EINVAL); 408 409 /* 410 * If this is a memory resource, map it into the kernel. 411 */ 412 switch (type) { 413 case SYS_RES_IOPORT: 414 panic("%s:%d SYS_RES_IOPORT handling not implemented", __func__, __LINE__); 415 /* XXX: untested 416 map->r_bushandle = start; 417 map->r_bustag = nexus_get_bus_tag(NULL, NULL); 418 map->r_size = length; 419 map->r_vaddr = NULL; 420 */ 421 break; 422 case SYS_RES_MEMORY: 423 map->r_vaddr = pmap_mapdev_attr(start, length, args.memattr); 424 map->r_bustag = nexus_get_bus_tag(NULL, NULL); 425 map->r_size = length; 426 map->r_bushandle = (bus_space_handle_t)map->r_vaddr; 427 break; 428 } 429 430 return (0); 431 432 } 433 434 static int 435 nexus_unmap_resource(device_t bus, device_t child, int type, struct resource *r, 436 struct resource_map *map) 437 { 438 439 /* 440 * If this is a memory resource, unmap it. 441 */ 442 switch (type) { 443 case SYS_RES_MEMORY: 444 pmap_unmapdev(map->r_vaddr, map->r_size); 445 /* FALLTHROUGH */ 446 case SYS_RES_IOPORT: 447 break; 448 default: 449 return (EINVAL); 450 } 451 452 return (0); 453 454 } 455