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 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/bus.h> 46 #include <sys/interrupt.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/module.h> 50 #include <sys/rman.h> 51 52 #include <vm/vm.h> 53 #include <vm/pmap.h> 54 55 #include <machine/bus.h> 56 #include <machine/pcb.h> 57 #include <machine/intr.h> 58 #include <machine/resource.h> 59 #include <machine/vmparam.h> 60 61 #include <arm/arm/nexusvar.h> 62 63 #ifdef FDT 64 #include <machine/fdt.h> 65 #include <dev/ofw/ofw_bus_subr.h> 66 #include "ofw_bus_if.h" 67 #endif 68 69 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 70 71 struct nexus_device { 72 struct resource_list nx_resources; 73 }; 74 75 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 76 77 static struct rman mem_rman; 78 static struct rman irq_rman; 79 80 static device_probe_t nexus_probe; 81 static device_attach_t nexus_attach; 82 83 static bus_add_child_t nexus_add_child; 84 static bus_print_child_t nexus_print_child; 85 86 static bus_activate_resource_t nexus_activate_resource; 87 static bus_adjust_resource_t nexus_adjust_resource; 88 static bus_alloc_resource_t nexus_alloc_resource; 89 static bus_deactivate_resource_t nexus_deactivate_resource; 90 static bus_release_resource_t nexus_release_resource; 91 92 #ifdef SMP 93 static bus_bind_intr_t nexus_bind_intr; 94 #endif 95 static bus_config_intr_t nexus_config_intr; 96 static bus_describe_intr_t nexus_describe_intr; 97 static bus_setup_intr_t nexus_setup_intr; 98 static bus_teardown_intr_t nexus_teardown_intr; 99 100 static bus_get_bus_tag_t nexus_get_bus_tag; 101 static bus_get_dma_tag_t nexus_get_dma_tag; 102 103 #ifdef FDT 104 static ofw_bus_map_intr_t nexus_ofw_map_intr; 105 #endif 106 107 /* 108 * Normally NULL (which results in defaults which are handled in 109 * busdma_machdep), platform init code can use nexus_set_dma_tag() to set this 110 * to a tag that will be inherited by all busses and devices on the platform. 111 */ 112 static bus_dma_tag_t nexus_dma_tag; 113 114 static device_method_t nexus_methods[] = { 115 /* Device interface */ 116 DEVMETHOD(device_probe, nexus_probe), 117 DEVMETHOD(device_attach, nexus_attach), 118 119 /* Bus interface */ 120 DEVMETHOD(bus_add_child, nexus_add_child), 121 DEVMETHOD(bus_print_child, nexus_print_child), 122 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 123 DEVMETHOD(bus_adjust_resource, nexus_adjust_resource), 124 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 125 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 126 DEVMETHOD(bus_release_resource, nexus_release_resource), 127 #ifdef SMP 128 DEVMETHOD(bus_bind_intr, nexus_bind_intr), 129 #endif 130 DEVMETHOD(bus_config_intr, nexus_config_intr), 131 DEVMETHOD(bus_describe_intr, nexus_describe_intr), 132 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 133 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 134 DEVMETHOD(bus_get_bus_tag, nexus_get_bus_tag), 135 DEVMETHOD(bus_get_dma_tag, nexus_get_dma_tag), 136 #ifdef FDT 137 /* ofw_bus interface */ 138 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr), 139 #endif 140 DEVMETHOD_END 141 }; 142 143 static driver_t nexus_driver = { 144 "nexus", 145 nexus_methods, 146 1 /* no softc */ 147 }; 148 149 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, 0, 0, 150 BUS_PASS_BUS + BUS_PASS_ORDER_EARLY); 151 152 static int 153 nexus_probe(device_t dev) 154 { 155 156 device_quiet(dev); /* suppress attach message for neatness */ 157 158 return (BUS_PROBE_DEFAULT); 159 } 160 161 static int 162 nexus_attach(device_t dev) 163 { 164 165 mem_rman.rm_start = 0; 166 mem_rman.rm_end = BUS_SPACE_MAXADDR; 167 mem_rman.rm_type = RMAN_ARRAY; 168 mem_rman.rm_descr = "I/O memory addresses"; 169 if (rman_init(&mem_rman) || 170 rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR)) 171 panic("nexus_probe mem_rman"); 172 irq_rman.rm_start = 0; 173 irq_rman.rm_end = ~0; 174 irq_rman.rm_type = RMAN_ARRAY; 175 irq_rman.rm_descr = "Interrupts"; 176 if (rman_init(&irq_rman) || rman_manage_region(&irq_rman, 0, ~0)) 177 panic("nexus_attach irq_rman"); 178 179 /* First, add ofwbus0. */ 180 device_add_child(dev, "ofwbus", 0); 181 182 /* 183 * Next, deal with the children we know about already. 184 */ 185 bus_generic_probe(dev); 186 bus_generic_attach(dev); 187 188 return (0); 189 } 190 191 static int 192 nexus_print_child(device_t bus, device_t child) 193 { 194 int retval = 0; 195 196 retval += bus_print_child_header(bus, child); 197 retval += printf("\n"); 198 199 return (retval); 200 } 201 202 static device_t 203 nexus_add_child(device_t bus, u_int order, const char *name, int unit) 204 { 205 device_t child; 206 struct nexus_device *ndev; 207 208 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 209 if (!ndev) 210 return (0); 211 resource_list_init(&ndev->nx_resources); 212 213 child = device_add_child_ordered(bus, order, name, unit); 214 215 device_set_ivars(child, ndev); 216 217 return (child); 218 } 219 220 /* 221 * Allocate a resource on behalf of child. NB: child is usually going to be a 222 * child of one of our descendants, not a direct child of nexus0. 223 */ 224 static struct resource * 225 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 226 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 227 { 228 struct resource *rv; 229 struct rman *rm; 230 int needactivate = flags & RF_ACTIVE; 231 232 flags &= ~RF_ACTIVE; 233 234 switch (type) { 235 case SYS_RES_IRQ: 236 rm = &irq_rman; 237 break; 238 239 case SYS_RES_MEMORY: 240 case SYS_RES_IOPORT: 241 rm = &mem_rman; 242 break; 243 244 default: 245 return (NULL); 246 } 247 248 rv = rman_reserve_resource(rm, start, end, count, flags, child); 249 if (rv == NULL) 250 return (NULL); 251 252 rman_set_rid(rv, *rid); 253 254 if (needactivate) { 255 if (bus_activate_resource(child, type, *rid, rv)) { 256 rman_release_resource(rv); 257 return (NULL); 258 } 259 } 260 261 return (rv); 262 } 263 264 static int 265 nexus_adjust_resource(device_t bus __unused, device_t child __unused, int type, 266 struct resource *r, rman_res_t start, rman_res_t end) 267 { 268 struct rman *rm; 269 270 switch (type) { 271 case SYS_RES_IRQ: 272 rm = &irq_rman; 273 break; 274 case SYS_RES_MEMORY: 275 rm = &mem_rman; 276 break; 277 default: 278 return (EINVAL); 279 } 280 if (rman_is_region_manager(r, rm) == 0) 281 return (EINVAL); 282 return (rman_adjust_resource(r, start, end)); 283 } 284 285 static int 286 nexus_release_resource(device_t bus, device_t child, int type, int rid, 287 struct resource *res) 288 { 289 int error; 290 291 if (rman_get_flags(res) & RF_ACTIVE) { 292 error = bus_deactivate_resource(child, type, rid, res); 293 if (error) 294 return (error); 295 } 296 return (rman_release_resource(res)); 297 } 298 299 static bus_space_tag_t 300 nexus_get_bus_tag(device_t bus __unused, device_t child __unused) 301 { 302 303 #ifdef FDT 304 return (fdtbus_bs_tag); 305 #else 306 return ((void *)1); 307 #endif 308 } 309 310 static bus_dma_tag_t 311 nexus_get_dma_tag(device_t dev, device_t child) 312 { 313 314 return (nexus_dma_tag); 315 } 316 317 void 318 nexus_set_dma_tag(bus_dma_tag_t tag) 319 { 320 321 nexus_dma_tag = tag; 322 } 323 324 static int 325 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 326 enum intr_polarity pol) 327 { 328 int ret = ENODEV; 329 330 device_printf(dev, "bus_config_intr is obsolete and not supported!\n"); 331 ret = EOPNOTSUPP; 332 return (ret); 333 } 334 335 static int 336 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 337 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep) 338 { 339 340 if ((rman_get_flags(res) & RF_SHAREABLE) == 0) 341 flags |= INTR_EXCL; 342 343 return (intr_setup_irq(child, res, filt, intr, arg, flags, cookiep)); 344 } 345 346 static int 347 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 348 { 349 350 return (intr_teardown_irq(child, r, ih)); 351 } 352 353 static int 354 nexus_describe_intr(device_t dev, device_t child, struct resource *irq, 355 void *cookie, const char *descr) 356 { 357 358 return (intr_describe_irq(child, irq, cookie, descr)); 359 } 360 361 #ifdef SMP 362 static int 363 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu) 364 { 365 366 return (intr_bind_irq(child, irq, cpu)); 367 } 368 #endif 369 370 static int 371 nexus_activate_resource(device_t bus, device_t child, int type, int rid, 372 struct resource *r) 373 { 374 int err; 375 bus_addr_t paddr; 376 bus_size_t psize; 377 bus_space_handle_t vaddr; 378 379 if ((err = rman_activate_resource(r)) != 0) 380 return (err); 381 382 /* 383 * If this is a memory resource, map it into the kernel. 384 */ 385 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 386 paddr = (bus_addr_t)rman_get_start(r); 387 psize = (bus_size_t)rman_get_size(r); 388 #ifdef FDT 389 err = bus_space_map(fdtbus_bs_tag, paddr, psize, 0, &vaddr); 390 if (err != 0) { 391 rman_deactivate_resource(r); 392 return (err); 393 } 394 rman_set_bustag(r, fdtbus_bs_tag); 395 #else 396 vaddr = (bus_space_handle_t)pmap_mapdev((vm_paddr_t)paddr, 397 (vm_size_t)psize); 398 if (vaddr == 0) { 399 rman_deactivate_resource(r); 400 return (ENOMEM); 401 } 402 rman_set_bustag(r, (void *)1); 403 #endif 404 rman_set_virtual(r, (void *)vaddr); 405 rman_set_bushandle(r, vaddr); 406 return (0); 407 } else if (type == SYS_RES_IRQ) { 408 err = intr_activate_irq(child, r); 409 if (err != 0) { 410 rman_deactivate_resource(r); 411 return (err); 412 } 413 } 414 return (0); 415 } 416 417 static int 418 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 419 struct resource *r) 420 { 421 bus_size_t psize; 422 bus_space_handle_t vaddr; 423 424 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 425 psize = (bus_size_t)rman_get_size(r); 426 vaddr = rman_get_bushandle(r); 427 428 if (vaddr != 0) { 429 #ifdef FDT 430 bus_space_unmap(fdtbus_bs_tag, vaddr, psize); 431 #else 432 pmap_unmapdev((void *)vaddr, (vm_size_t)psize); 433 #endif 434 rman_set_virtual(r, NULL); 435 rman_set_bushandle(r, 0); 436 } 437 } else if (type == SYS_RES_IRQ) { 438 intr_deactivate_irq(child, r); 439 } 440 441 return (rman_deactivate_resource(r)); 442 } 443 444 #ifdef FDT 445 static int 446 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells, 447 pcell_t *intr) 448 { 449 u_int irq; 450 struct intr_map_data_fdt *fdt_data; 451 size_t len; 452 453 len = sizeof(*fdt_data) + icells * sizeof(pcell_t); 454 fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data( 455 INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO); 456 fdt_data->iparent = iparent; 457 fdt_data->ncells = icells; 458 memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t)); 459 irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data); 460 return (irq); 461 } 462 #endif /* FDT */ 463