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/param.h> 43 #include <sys/systm.h> 44 #include <sys/bus.h> 45 #include <sys/interrupt.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/module.h> 49 #include <sys/rman.h> 50 51 #include <vm/vm.h> 52 #include <vm/pmap.h> 53 54 #include <machine/bus.h> 55 #include <machine/pcb.h> 56 #include <machine/intr.h> 57 #include <machine/resource.h> 58 #include <machine/vmparam.h> 59 60 #include <arm/arm/nexusvar.h> 61 62 #ifdef FDT 63 #include <machine/fdt.h> 64 #include <dev/ofw/ofw_bus_subr.h> 65 #include "ofw_bus_if.h" 66 #endif 67 68 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 69 70 struct nexus_device { 71 struct resource_list nx_resources; 72 }; 73 74 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 75 76 static struct rman mem_rman; 77 static struct rman irq_rman; 78 79 static device_probe_t nexus_probe; 80 static device_attach_t nexus_attach; 81 82 static bus_add_child_t nexus_add_child; 83 static bus_print_child_t nexus_print_child; 84 85 static bus_activate_resource_t nexus_activate_resource; 86 static bus_deactivate_resource_t nexus_deactivate_resource; 87 static bus_get_rman_t nexus_get_rman; 88 static bus_map_resource_t nexus_map_resource; 89 static bus_unmap_resource_t nexus_unmap_resource; 90 91 #ifdef SMP 92 static bus_bind_intr_t nexus_bind_intr; 93 #endif 94 static bus_config_intr_t nexus_config_intr; 95 static bus_describe_intr_t nexus_describe_intr; 96 static bus_setup_intr_t nexus_setup_intr; 97 static bus_teardown_intr_t nexus_teardown_intr; 98 99 static bus_get_bus_tag_t nexus_get_bus_tag; 100 static bus_get_dma_tag_t nexus_get_dma_tag; 101 102 #ifdef FDT 103 static ofw_bus_map_intr_t nexus_ofw_map_intr; 104 #endif 105 106 /* 107 * Normally NULL (which results in defaults which are handled in 108 * busdma_machdep), platform init code can use nexus_set_dma_tag() to set this 109 * to a tag that will be inherited by all busses and devices on the platform. 110 */ 111 static bus_dma_tag_t nexus_dma_tag; 112 113 static device_method_t nexus_methods[] = { 114 /* Device interface */ 115 DEVMETHOD(device_probe, nexus_probe), 116 DEVMETHOD(device_attach, nexus_attach), 117 118 /* Bus interface */ 119 DEVMETHOD(bus_add_child, nexus_add_child), 120 DEVMETHOD(bus_print_child, nexus_print_child), 121 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 122 DEVMETHOD(bus_adjust_resource, bus_generic_rman_adjust_resource), 123 DEVMETHOD(bus_alloc_resource, bus_generic_rman_alloc_resource), 124 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 125 DEVMETHOD(bus_get_rman, nexus_get_rman), 126 DEVMETHOD(bus_map_resource, nexus_map_resource), 127 DEVMETHOD(bus_release_resource, bus_generic_rman_release_resource), 128 DEVMETHOD(bus_unmap_resource, nexus_unmap_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 static struct rman * 223 nexus_get_rman(device_t bus, int type, u_int flags) 224 { 225 switch (type) { 226 case SYS_RES_IRQ: 227 return (&irq_rman); 228 case SYS_RES_MEMORY: 229 case SYS_RES_IOPORT: 230 return (&mem_rman); 231 default: 232 return (NULL); 233 } 234 } 235 236 static bus_space_tag_t 237 nexus_get_bus_tag(device_t bus __unused, device_t child __unused) 238 { 239 240 #ifdef FDT 241 return (fdtbus_bs_tag); 242 #else 243 return ((void *)1); 244 #endif 245 } 246 247 static bus_dma_tag_t 248 nexus_get_dma_tag(device_t dev, device_t child) 249 { 250 251 return (nexus_dma_tag); 252 } 253 254 void 255 nexus_set_dma_tag(bus_dma_tag_t tag) 256 { 257 258 nexus_dma_tag = tag; 259 } 260 261 static int 262 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 263 enum intr_polarity pol) 264 { 265 int ret = ENODEV; 266 267 device_printf(dev, "bus_config_intr is obsolete and not supported!\n"); 268 ret = EOPNOTSUPP; 269 return (ret); 270 } 271 272 static int 273 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 274 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep) 275 { 276 277 if ((rman_get_flags(res) & RF_SHAREABLE) == 0) 278 flags |= INTR_EXCL; 279 280 return (intr_setup_irq(child, res, filt, intr, arg, flags, cookiep)); 281 } 282 283 static int 284 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 285 { 286 287 return (intr_teardown_irq(child, r, ih)); 288 } 289 290 static int 291 nexus_describe_intr(device_t dev, device_t child, struct resource *irq, 292 void *cookie, const char *descr) 293 { 294 295 return (intr_describe_irq(child, irq, cookie, descr)); 296 } 297 298 #ifdef SMP 299 static int 300 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu) 301 { 302 303 return (intr_bind_irq(child, irq, cpu)); 304 } 305 #endif 306 307 static int 308 nexus_activate_resource(device_t bus, device_t child, struct resource *r) 309 { 310 int err; 311 312 switch (rman_get_type(r)) { 313 case SYS_RES_MEMORY: 314 case SYS_RES_IOPORT: 315 return (bus_generic_rman_activate_resource(bus, child, r)); 316 case SYS_RES_IRQ: 317 err = rman_activate_resource(r); 318 if (err != 0) 319 return (err); 320 err = intr_activate_irq(child, r); 321 if (err != 0) { 322 rman_deactivate_resource(r); 323 return (err); 324 } 325 return (0); 326 default: 327 return (EINVAL); 328 } 329 } 330 331 static int 332 nexus_map_resource(device_t bus, device_t child, struct resource *r, 333 struct resource_map_request *argsp, struct resource_map *map) 334 { 335 struct resource_map_request args; 336 rman_res_t length, start; 337 int error; 338 339 /* Resources must be active to be mapped. */ 340 if (!(rman_get_flags(r) & RF_ACTIVE)) 341 return (ENXIO); 342 343 switch (rman_get_type(r)) { 344 case SYS_RES_MEMORY: 345 case SYS_RES_IOPORT: 346 break; 347 default: 348 return (EINVAL); 349 } 350 351 resource_init_map_request(&args); 352 error = resource_validate_map_request(r, argsp, &args, &start, &length); 353 if (error) 354 return (error); 355 356 #ifdef FDT 357 error = bus_space_map(fdtbus_bs_tag, start, length, 0, 358 &map->r_bushandle); 359 if (error) 360 return (error); 361 map->r_bustag = fdtbus_bs_tag; 362 map->r_vaddr = (void *)map->r_bushandle; 363 #else 364 map->r_vaddr = pmap_mapdev(start, length); 365 if (map->r_vaddr == NULL) 366 return (ENOMEM); 367 map->r_bustag = (void *)1; 368 map->r_bushandle = (bus_space_handle_t)map->r_vaddr; 369 #endif 370 map->r_size = length; 371 return (0); 372 } 373 374 static int 375 nexus_unmap_resource(device_t bus, device_t child, struct resource *r, 376 struct resource_map *map) 377 { 378 379 switch (rman_get_type(r)) { 380 case SYS_RES_MEMORY: 381 case SYS_RES_IOPORT: 382 #ifdef FDT 383 bus_space_unmap(map->r_bustag, map->r_bushandle, map->r_size); 384 #else 385 pmap_unmapdev(map->r_vaddr, map->r_size); 386 #endif 387 return (0); 388 default: 389 return (EINVAL); 390 } 391 } 392 393 static int 394 nexus_deactivate_resource(device_t bus, device_t child, struct resource *r) 395 { 396 int error; 397 398 switch (rman_get_type(r)) { 399 case SYS_RES_MEMORY: 400 case SYS_RES_IOPORT: 401 return (bus_generic_rman_deactivate_resource(bus, child, r)); 402 case SYS_RES_IRQ: 403 error = rman_deactivate_resource(r); 404 if (error) 405 return (error); 406 intr_deactivate_irq(child, r); 407 return (0); 408 default: 409 return (EINVAL); 410 } 411 } 412 413 #ifdef FDT 414 static int 415 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells, 416 pcell_t *intr) 417 { 418 u_int irq; 419 struct intr_map_data_fdt *fdt_data; 420 size_t len; 421 422 len = sizeof(*fdt_data) + icells * sizeof(pcell_t); 423 fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data( 424 INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO); 425 fdt_data->iparent = iparent; 426 fdt_data->ncells = icells; 427 memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t)); 428 irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data); 429 return (irq); 430 } 431 #endif /* FDT */ 432