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, DMA requests (which rightfully should be a part of the 38 * ISA code but it's easier to do it here for now), I/O port addresses, 39 * and I/O memory address space. 40 */ 41 42 #include "opt_platform.h" 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/bus.h> 50 #include <sys/kernel.h> 51 #include <sys/malloc.h> 52 #include <sys/module.h> 53 #include <machine/bus.h> 54 #include <sys/rman.h> 55 #include <sys/interrupt.h> 56 57 #include <machine/vmparam.h> 58 #include <machine/pcb.h> 59 #include <vm/vm.h> 60 #include <vm/pmap.h> 61 62 #include <machine/resource.h> 63 #include <machine/intr.h> 64 65 #ifdef FDT 66 #include <machine/fdt.h> 67 #include "ofw_bus_if.h" 68 #endif 69 70 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 71 72 struct nexus_device { 73 struct resource_list nx_resources; 74 }; 75 76 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 77 78 static struct rman mem_rman; 79 80 static int nexus_probe(device_t); 81 static int nexus_attach(device_t); 82 static int nexus_print_child(device_t, device_t); 83 static device_t nexus_add_child(device_t, u_int, const char *, int); 84 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 85 rman_res_t, rman_res_t, rman_res_t, u_int); 86 static int nexus_activate_resource(device_t, device_t, int, int, 87 struct resource *); 88 static bus_space_tag_t nexus_get_bus_tag(device_t, device_t); 89 #ifdef ARM_INTRNG 90 #ifdef SMP 91 static int nexus_bind_intr(device_t, device_t, struct resource *, int); 92 #endif 93 #endif 94 static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 95 enum intr_polarity pol); 96 #ifdef ARM_INTRNG 97 static int nexus_describe_intr(device_t dev, device_t child, 98 struct resource *irq, void *cookie, const char *descr); 99 #endif 100 static int nexus_deactivate_resource(device_t, device_t, int, int, 101 struct resource *); 102 static int nexus_release_resource(device_t, device_t, int, int, 103 struct resource *); 104 105 static int nexus_setup_intr(device_t dev, device_t child, struct resource *res, 106 int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep); 107 static int nexus_teardown_intr(device_t, device_t, struct resource *, void *); 108 109 #ifdef FDT 110 static int nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, 111 int icells, pcell_t *intr); 112 #endif 113 114 static device_method_t nexus_methods[] = { 115 /* Device interface */ 116 DEVMETHOD(device_probe, nexus_probe), 117 DEVMETHOD(device_attach, nexus_attach), 118 /* Bus interface */ 119 DEVMETHOD(bus_print_child, nexus_print_child), 120 DEVMETHOD(bus_add_child, nexus_add_child), 121 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 122 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 123 DEVMETHOD(bus_config_intr, nexus_config_intr), 124 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 125 DEVMETHOD(bus_release_resource, nexus_release_resource), 126 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 127 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 128 DEVMETHOD(bus_get_bus_tag, nexus_get_bus_tag), 129 #ifdef ARM_INTRNG 130 DEVMETHOD(bus_describe_intr, nexus_describe_intr), 131 #ifdef SMP 132 DEVMETHOD(bus_bind_intr, nexus_bind_intr), 133 #endif 134 #endif 135 #ifdef FDT 136 DEVMETHOD(ofw_bus_map_intr, nexus_ofw_map_intr), 137 #endif 138 { 0, 0 } 139 }; 140 141 static devclass_t nexus_devclass; 142 static driver_t nexus_driver = { 143 "nexus", 144 nexus_methods, 145 1 /* no softc */ 146 }; 147 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0, 148 BUS_PASS_BUS + BUS_PASS_ORDER_EARLY); 149 150 static int 151 nexus_probe(device_t dev) 152 { 153 154 device_quiet(dev); /* suppress attach message for neatness */ 155 156 return (BUS_PROBE_DEFAULT); 157 } 158 159 static int 160 nexus_attach(device_t dev) 161 { 162 163 mem_rman.rm_start = 0; 164 mem_rman.rm_end = BUS_SPACE_MAXADDR; 165 mem_rman.rm_type = RMAN_ARRAY; 166 mem_rman.rm_descr = "I/O memory addresses"; 167 if (rman_init(&mem_rman) || 168 rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR)) 169 panic("nexus_probe mem_rman"); 170 171 /* 172 * First, deal with the children we know about already 173 */ 174 bus_generic_probe(dev); 175 bus_generic_attach(dev); 176 177 return (0); 178 } 179 180 static int 181 nexus_print_child(device_t bus, device_t child) 182 { 183 int retval = 0; 184 185 retval += bus_print_child_header(bus, child); 186 retval += printf("\n"); 187 188 return (retval); 189 } 190 191 static device_t 192 nexus_add_child(device_t bus, u_int order, const char *name, int unit) 193 { 194 device_t child; 195 struct nexus_device *ndev; 196 197 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 198 if (!ndev) 199 return (0); 200 resource_list_init(&ndev->nx_resources); 201 202 child = device_add_child_ordered(bus, order, name, unit); 203 204 /* should we free this in nexus_child_detached? */ 205 device_set_ivars(child, ndev); 206 207 return (child); 208 } 209 210 211 /* 212 * Allocate a resource on behalf of child. NB: child is usually going to be a 213 * child of one of our descendants, not a direct child of nexus0. 214 * (Exceptions include footbridge.) 215 */ 216 static struct resource * 217 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 218 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 219 { 220 struct resource *rv; 221 struct rman *rm; 222 int needactivate = flags & RF_ACTIVE; 223 224 flags &= ~RF_ACTIVE; 225 226 switch (type) { 227 case SYS_RES_MEMORY: 228 case SYS_RES_IOPORT: 229 rm = &mem_rman; 230 break; 231 232 default: 233 return (NULL); 234 } 235 236 rv = rman_reserve_resource(rm, start, end, count, flags, child); 237 if (rv == 0) 238 return (NULL); 239 240 rman_set_rid(rv, *rid); 241 242 if (needactivate) { 243 if (bus_activate_resource(child, type, *rid, rv)) { 244 rman_release_resource(rv); 245 return (0); 246 } 247 } 248 249 return (rv); 250 } 251 252 static int 253 nexus_release_resource(device_t bus, device_t child, int type, int rid, 254 struct resource *res) 255 { 256 int error; 257 258 if (rman_get_flags(res) & RF_ACTIVE) { 259 error = bus_deactivate_resource(child, type, rid, res); 260 if (error) 261 return (error); 262 } 263 return (rman_release_resource(res)); 264 } 265 266 static bus_space_tag_t 267 nexus_get_bus_tag(device_t bus __unused, device_t child __unused) 268 { 269 270 #ifdef FDT 271 return(fdtbus_bs_tag); 272 #else 273 return((void *)1); 274 #endif 275 } 276 277 static int 278 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 279 enum intr_polarity pol) 280 { 281 int ret = ENODEV; 282 283 #ifdef ARM_INTRNG 284 ret = intr_irq_config(irq, trig, pol); 285 #else 286 if (arm_config_irq) 287 ret = (*arm_config_irq)(irq, trig, pol); 288 #endif 289 return (ret); 290 } 291 292 static int 293 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 294 driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep) 295 { 296 int irq; 297 298 if ((rman_get_flags(res) & RF_SHAREABLE) == 0) 299 flags |= INTR_EXCL; 300 301 for (irq = rman_get_start(res); irq <= rman_get_end(res); irq++) { 302 #ifdef ARM_INTRNG 303 intr_irq_add_handler(child, filt, intr, arg, irq, flags, 304 cookiep); 305 #else 306 arm_setup_irqhandler(device_get_nameunit(child), 307 filt, intr, arg, irq, flags, cookiep); 308 arm_unmask_irq(irq); 309 #endif 310 } 311 return (0); 312 } 313 314 static int 315 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 316 { 317 318 #ifdef ARM_INTRNG 319 return (intr_irq_remove_handler(child, rman_get_start(r), ih)); 320 #else 321 return (arm_remove_irqhandler(rman_get_start(r), ih)); 322 #endif 323 } 324 325 #ifdef ARM_INTRNG 326 static int 327 nexus_describe_intr(device_t dev, device_t child, struct resource *irq, 328 void *cookie, const char *descr) 329 { 330 331 return (intr_irq_describe(rman_get_start(irq), cookie, descr)); 332 } 333 334 #ifdef SMP 335 static int 336 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu) 337 { 338 339 return (intr_irq_bind(rman_get_start(irq), cpu)); 340 } 341 #endif 342 #endif 343 344 static int 345 nexus_activate_resource(device_t bus, device_t child, int type, int rid, 346 struct resource *r) 347 { 348 int err; 349 bus_addr_t paddr; 350 bus_size_t psize; 351 bus_space_handle_t vaddr; 352 353 if ((err = rman_activate_resource(r)) != 0) 354 return (err); 355 356 /* 357 * If this is a memory resource, map it into the kernel. 358 */ 359 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 360 paddr = (bus_addr_t)rman_get_start(r); 361 psize = (bus_size_t)rman_get_size(r); 362 #ifdef FDT 363 err = bus_space_map(fdtbus_bs_tag, paddr, psize, 0, &vaddr); 364 if (err != 0) { 365 rman_deactivate_resource(r); 366 return (err); 367 } 368 rman_set_bustag(r, fdtbus_bs_tag); 369 #else 370 vaddr = (bus_space_handle_t)pmap_mapdev((vm_offset_t)paddr, 371 (vm_size_t)psize); 372 if (vaddr == 0) { 373 rman_deactivate_resource(r); 374 return (ENOMEM); 375 } 376 rman_set_bustag(r, (void *)1); 377 #endif 378 rman_set_virtual(r, (void *)vaddr); 379 rman_set_bushandle(r, vaddr); 380 } 381 return (0); 382 } 383 384 static int 385 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 386 struct resource *r) 387 { 388 bus_size_t psize; 389 bus_space_handle_t vaddr; 390 391 psize = (bus_size_t)rman_get_size(r); 392 vaddr = rman_get_bushandle(r); 393 394 if (vaddr != 0) { 395 #ifdef FDT 396 bus_space_unmap(fdtbus_bs_tag, vaddr, psize); 397 #else 398 pmap_unmapdev((vm_offset_t)vaddr, (vm_size_t)psize); 399 #endif 400 rman_set_virtual(r, NULL); 401 rman_set_bushandle(r, 0); 402 } 403 404 return (rman_deactivate_resource(r)); 405 } 406 407 #ifdef FDT 408 static int 409 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells, 410 pcell_t *intr) 411 { 412 413 return (intr_fdt_map_irq(iparent, intr, icells)); 414 } 415 #endif 416