1 /*- 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 /* 32 * This code implements a `root nexus' for Arm Architecture 33 * machines. The function of the root nexus is to serve as an 34 * attachment point for both processors and buses, and to manage 35 * resources which are common to all of them. In particular, 36 * this code implements the core resource managers for interrupt 37 * requests and I/O memory address space. 38 */ 39 40 #include "opt_platform.h" 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/bus.h> 48 #include <sys/interrupt.h> 49 #include <sys/kernel.h> 50 #include <sys/malloc.h> 51 #include <sys/module.h> 52 #include <sys/rman.h> 53 54 #include <vm/vm.h> 55 #include <vm/pmap.h> 56 57 #include <machine/bus.h> 58 #include <machine/pcb.h> 59 #include <machine/intr.h> 60 #include <machine/resource.h> 61 #include <machine/vmparam.h> 62 63 #include <arm/arm/nexusvar.h> 64 65 #ifdef FDT 66 #include <machine/fdt.h> 67 #include <dev/ofw/ofw_bus_subr.h> 68 #include "ofw_bus_if.h" 69 #endif 70 71 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 72 73 struct nexus_device { 74 struct resource_list nx_resources; 75 }; 76 77 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 78 79 static struct rman mem_rman; 80 static struct rman irq_rman; 81 82 static device_probe_t nexus_probe; 83 static device_attach_t nexus_attach; 84 85 static bus_add_child_t nexus_add_child; 86 static bus_print_child_t nexus_print_child; 87 88 static bus_activate_resource_t nexus_activate_resource; 89 static bus_adjust_resource_t nexus_adjust_resource; 90 static bus_alloc_resource_t nexus_alloc_resource; 91 static bus_deactivate_resource_t nexus_deactivate_resource; 92 static bus_release_resource_t nexus_release_resource; 93 94 #ifdef SMP 95 static bus_bind_intr_t nexus_bind_intr; 96 #endif 97 static bus_config_intr_t nexus_config_intr; 98 static bus_describe_intr_t nexus_describe_intr; 99 static bus_setup_intr_t nexus_setup_intr; 100 static bus_teardown_intr_t nexus_teardown_intr; 101 102 static bus_get_bus_tag_t nexus_get_bus_tag; 103 static bus_get_dma_tag_t nexus_get_dma_tag; 104 105 #ifdef FDT 106 static ofw_bus_map_intr_t nexus_ofw_map_intr; 107 #endif 108 109 /* 110 * Normally NULL (which results in defaults which are handled in 111 * busdma_machdep), platform init code can use nexus_set_dma_tag() to set this 112 * to a tag that will be inherited by all busses and devices on the platform. 113 */ 114 static bus_dma_tag_t nexus_dma_tag; 115 116 static device_method_t nexus_methods[] = { 117 /* Device interface */ 118 DEVMETHOD(device_probe, nexus_probe), 119 DEVMETHOD(device_attach, nexus_attach), 120 121 /* Bus interface */ 122 DEVMETHOD(bus_add_child, nexus_add_child), 123 DEVMETHOD(bus_print_child, nexus_print_child), 124 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 125 DEVMETHOD(bus_adjust_resource, nexus_adjust_resource), 126 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 127 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 128 DEVMETHOD(bus_release_resource, nexus_release_resource), 129 #ifdef SMP 130 DEVMETHOD(bus_bind_intr, nexus_bind_intr), 131 #endif 132 DEVMETHOD(bus_config_intr, nexus_config_intr), 133 DEVMETHOD(bus_describe_intr, nexus_describe_intr), 134 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 135 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 136 DEVMETHOD(bus_get_bus_tag, nexus_get_bus_tag), 137 DEVMETHOD(bus_get_dma_tag, nexus_get_dma_tag), 138 #ifdef FDT 139 /* ofw_bus interface */ 140 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr), 141 #endif 142 DEVMETHOD_END 143 }; 144 145 static driver_t nexus_driver = { 146 "nexus", 147 nexus_methods, 148 1 /* no softc */ 149 }; 150 151 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, 0, 0, 152 BUS_PASS_BUS + BUS_PASS_ORDER_EARLY); 153 154 static int 155 nexus_probe(device_t dev) 156 { 157 158 device_quiet(dev); /* suppress attach message for neatness */ 159 160 return (BUS_PROBE_DEFAULT); 161 } 162 163 static int 164 nexus_attach(device_t dev) 165 { 166 167 mem_rman.rm_start = 0; 168 mem_rman.rm_end = BUS_SPACE_MAXADDR; 169 mem_rman.rm_type = RMAN_ARRAY; 170 mem_rman.rm_descr = "I/O memory addresses"; 171 if (rman_init(&mem_rman) || 172 rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR)) 173 panic("nexus_probe mem_rman"); 174 irq_rman.rm_start = 0; 175 irq_rman.rm_end = ~0; 176 irq_rman.rm_type = RMAN_ARRAY; 177 irq_rman.rm_descr = "Interrupts"; 178 if (rman_init(&irq_rman) || rman_manage_region(&irq_rman, 0, ~0)) 179 panic("nexus_attach irq_rman"); 180 181 /* First, add ofwbus0. */ 182 device_add_child(dev, "ofwbus", 0); 183 184 /* 185 * Next, deal with the children we know about already. 186 */ 187 bus_generic_probe(dev); 188 bus_generic_attach(dev); 189 190 return (0); 191 } 192 193 static int 194 nexus_print_child(device_t bus, device_t child) 195 { 196 int retval = 0; 197 198 retval += bus_print_child_header(bus, child); 199 retval += printf("\n"); 200 201 return (retval); 202 } 203 204 static device_t 205 nexus_add_child(device_t bus, u_int order, const char *name, int unit) 206 { 207 device_t child; 208 struct nexus_device *ndev; 209 210 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 211 if (!ndev) 212 return (0); 213 resource_list_init(&ndev->nx_resources); 214 215 child = device_add_child_ordered(bus, order, name, unit); 216 217 device_set_ivars(child, ndev); 218 219 return (child); 220 } 221 222 /* 223 * Allocate a resource on behalf of child. NB: child is usually going to be a 224 * child of one of our descendants, not a direct child of nexus0. 225 */ 226 static struct resource * 227 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 228 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 229 { 230 struct resource *rv; 231 struct rman *rm; 232 int needactivate = flags & RF_ACTIVE; 233 234 flags &= ~RF_ACTIVE; 235 236 switch (type) { 237 case SYS_RES_IRQ: 238 rm = &irq_rman; 239 break; 240 241 case SYS_RES_MEMORY: 242 case SYS_RES_IOPORT: 243 rm = &mem_rman; 244 break; 245 246 default: 247 return (NULL); 248 } 249 250 rv = rman_reserve_resource(rm, start, end, count, flags, child); 251 if (rv == NULL) 252 return (NULL); 253 254 rman_set_rid(rv, *rid); 255 256 if (needactivate) { 257 if (bus_activate_resource(child, type, *rid, rv)) { 258 rman_release_resource(rv); 259 return (0); 260 } 261 } 262 263 return (rv); 264 } 265 266 static int 267 nexus_adjust_resource(device_t bus __unused, device_t child __unused, int type, 268 struct resource *r, rman_res_t start, rman_res_t end) 269 { 270 struct rman *rm; 271 272 switch (type) { 273 case SYS_RES_IRQ: 274 rm = &irq_rman; 275 break; 276 case SYS_RES_MEMORY: 277 rm = &mem_rman; 278 break; 279 default: 280 return (EINVAL); 281 } 282 if (rman_is_region_manager(r, rm) == 0) 283 return (EINVAL); 284 return (rman_adjust_resource(r, start, end)); 285 } 286 287 static int 288 nexus_release_resource(device_t bus, device_t child, int type, int rid, 289 struct resource *res) 290 { 291 int error; 292 293 if (rman_get_flags(res) & RF_ACTIVE) { 294 error = bus_deactivate_resource(child, type, rid, res); 295 if (error) 296 return (error); 297 } 298 return (rman_release_resource(res)); 299 } 300 301 static bus_space_tag_t 302 nexus_get_bus_tag(device_t bus __unused, device_t child __unused) 303 { 304 305 #ifdef FDT 306 return (fdtbus_bs_tag); 307 #else 308 return ((void *)1); 309 #endif 310 } 311 312 static bus_dma_tag_t 313 nexus_get_dma_tag(device_t dev, device_t child) 314 { 315 316 return (nexus_dma_tag); 317 } 318 319 void 320 nexus_set_dma_tag(bus_dma_tag_t tag) 321 { 322 323 nexus_dma_tag = tag; 324 } 325 326 static int 327 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 328 enum intr_polarity pol) 329 { 330 int ret = ENODEV; 331 332 device_printf(dev, "bus_config_intr is obsolete and not supported!\n"); 333 ret = EOPNOTSUPP; 334 return (ret); 335 } 336 337 static int 338 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 339 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep) 340 { 341 342 if ((rman_get_flags(res) & RF_SHAREABLE) == 0) 343 flags |= INTR_EXCL; 344 345 return (intr_setup_irq(child, res, filt, intr, arg, flags, cookiep)); 346 } 347 348 static int 349 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 350 { 351 352 return (intr_teardown_irq(child, r, ih)); 353 } 354 355 static int 356 nexus_describe_intr(device_t dev, device_t child, struct resource *irq, 357 void *cookie, const char *descr) 358 { 359 360 return (intr_describe_irq(child, irq, cookie, descr)); 361 } 362 363 #ifdef SMP 364 static int 365 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu) 366 { 367 368 return (intr_bind_irq(child, irq, cpu)); 369 } 370 #endif 371 372 static int 373 nexus_activate_resource(device_t bus, device_t child, int type, int rid, 374 struct resource *r) 375 { 376 int err; 377 bus_addr_t paddr; 378 bus_size_t psize; 379 bus_space_handle_t vaddr; 380 381 if ((err = rman_activate_resource(r)) != 0) 382 return (err); 383 384 /* 385 * If this is a memory resource, map it into the kernel. 386 */ 387 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 388 paddr = (bus_addr_t)rman_get_start(r); 389 psize = (bus_size_t)rman_get_size(r); 390 #ifdef FDT 391 err = bus_space_map(fdtbus_bs_tag, paddr, psize, 0, &vaddr); 392 if (err != 0) { 393 rman_deactivate_resource(r); 394 return (err); 395 } 396 rman_set_bustag(r, fdtbus_bs_tag); 397 #else 398 vaddr = (bus_space_handle_t)pmap_mapdev((vm_paddr_t)paddr, 399 (vm_size_t)psize); 400 if (vaddr == 0) { 401 rman_deactivate_resource(r); 402 return (ENOMEM); 403 } 404 rman_set_bustag(r, (void *)1); 405 #endif 406 rman_set_virtual(r, (void *)vaddr); 407 rman_set_bushandle(r, vaddr); 408 return (0); 409 } else if (type == SYS_RES_IRQ) { 410 err = intr_activate_irq(child, r); 411 if (err != 0) { 412 rman_deactivate_resource(r); 413 return (err); 414 } 415 } 416 return (0); 417 } 418 419 static int 420 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 421 struct resource *r) 422 { 423 bus_size_t psize; 424 bus_space_handle_t vaddr; 425 426 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 427 psize = (bus_size_t)rman_get_size(r); 428 vaddr = rman_get_bushandle(r); 429 430 if (vaddr != 0) { 431 #ifdef FDT 432 bus_space_unmap(fdtbus_bs_tag, vaddr, psize); 433 #else 434 pmap_unmapdev((void *)vaddr, (vm_size_t)psize); 435 #endif 436 rman_set_virtual(r, NULL); 437 rman_set_bushandle(r, 0); 438 } 439 } else if (type == SYS_RES_IRQ) { 440 intr_deactivate_irq(child, r); 441 } 442 443 return (rman_deactivate_resource(r)); 444 } 445 446 #ifdef FDT 447 static int 448 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells, 449 pcell_t *intr) 450 { 451 u_int irq; 452 struct intr_map_data_fdt *fdt_data; 453 size_t len; 454 455 len = sizeof(*fdt_data) + icells * sizeof(pcell_t); 456 fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data( 457 INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO); 458 fdt_data->iparent = iparent; 459 fdt_data->ncells = icells; 460 memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t)); 461 irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data); 462 return (irq); 463 } 464 #endif /* FDT */ 465