1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009-2010 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * This software was developed by Semihalf under sponsorship from 8 * the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/systm.h> 39 40 #include <contrib/libfdt/libfdt.h> 41 42 #include <machine/stdarg.h> 43 44 #include <dev/fdt/fdt_common.h> 45 #include <dev/ofw/ofwvar.h> 46 #include <dev/ofw/openfirm.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include "ofw_if.h" 50 51 #ifdef DEBUG 52 #define debugf(fmt, args...) do { printf("%s(): ", __func__); \ 53 printf(fmt,##args); } while (0) 54 #else 55 #define debugf(fmt, args...) 56 #endif 57 58 #if defined(__arm__) 59 #if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) || \ 60 defined(SOC_MV_DISCOVERY) || defined(SOC_MV_DOVE) || \ 61 defined(SOC_MV_FREY) || defined(SOC_MV_KIRKWOOD) || \ 62 defined(SOC_MV_LOKIPLUS) || defined(SOC_MV_ORION) 63 #define FDT_MARVELL 64 #endif 65 #endif 66 67 static int ofw_fdt_init(ofw_t, void *); 68 static phandle_t ofw_fdt_peer(ofw_t, phandle_t); 69 static phandle_t ofw_fdt_child(ofw_t, phandle_t); 70 static phandle_t ofw_fdt_parent(ofw_t, phandle_t); 71 static phandle_t ofw_fdt_instance_to_package(ofw_t, ihandle_t); 72 static ssize_t ofw_fdt_getproplen(ofw_t, phandle_t, const char *); 73 static ssize_t ofw_fdt_getprop(ofw_t, phandle_t, const char *, void *, size_t); 74 static int ofw_fdt_nextprop(ofw_t, phandle_t, const char *, char *, size_t); 75 static int ofw_fdt_setprop(ofw_t, phandle_t, const char *, const void *, 76 size_t); 77 static ssize_t ofw_fdt_canon(ofw_t, const char *, char *, size_t); 78 static phandle_t ofw_fdt_finddevice(ofw_t, const char *); 79 static ssize_t ofw_fdt_instance_to_path(ofw_t, ihandle_t, char *, size_t); 80 static ssize_t ofw_fdt_package_to_path(ofw_t, phandle_t, char *, size_t); 81 static int ofw_fdt_interpret(ofw_t, const char *, int, cell_t *); 82 83 static ofw_method_t ofw_fdt_methods[] = { 84 OFWMETHOD(ofw_init, ofw_fdt_init), 85 OFWMETHOD(ofw_peer, ofw_fdt_peer), 86 OFWMETHOD(ofw_child, ofw_fdt_child), 87 OFWMETHOD(ofw_parent, ofw_fdt_parent), 88 OFWMETHOD(ofw_instance_to_package, ofw_fdt_instance_to_package), 89 OFWMETHOD(ofw_getproplen, ofw_fdt_getproplen), 90 OFWMETHOD(ofw_getprop, ofw_fdt_getprop), 91 OFWMETHOD(ofw_nextprop, ofw_fdt_nextprop), 92 OFWMETHOD(ofw_setprop, ofw_fdt_setprop), 93 OFWMETHOD(ofw_canon, ofw_fdt_canon), 94 OFWMETHOD(ofw_finddevice, ofw_fdt_finddevice), 95 OFWMETHOD(ofw_instance_to_path, ofw_fdt_instance_to_path), 96 OFWMETHOD(ofw_package_to_path, ofw_fdt_package_to_path), 97 OFWMETHOD(ofw_interpret, ofw_fdt_interpret), 98 { 0, 0 } 99 }; 100 101 static ofw_def_t ofw_fdt = { 102 OFW_FDT, 103 ofw_fdt_methods, 104 0 105 }; 106 OFW_DEF(ofw_fdt); 107 108 static void *fdtp = NULL; 109 110 static int 111 sysctl_handle_dtb(SYSCTL_HANDLER_ARGS) 112 { 113 114 return (sysctl_handle_opaque(oidp, fdtp, fdt_totalsize(fdtp), req)); 115 } 116 117 static void 118 sysctl_register_fdt_oid(void *arg) 119 { 120 121 /* If there is no FDT registered, skip adding the sysctl */ 122 if (fdtp == NULL) 123 return; 124 125 SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt), OID_AUTO, "dtb", 126 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 127 sysctl_handle_dtb, "", "Device Tree Blob"); 128 } 129 SYSINIT(dtb_oid, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_fdt_oid, NULL); 130 131 static int 132 ofw_fdt_init(ofw_t ofw, void *data) 133 { 134 int err; 135 136 /* Check FDT blob integrity */ 137 if ((err = fdt_check_header(data)) != 0) 138 return (err); 139 140 fdtp = data; 141 return (0); 142 } 143 144 /* 145 * Device tree functions. 146 * 147 * We use the offset from fdtp to the node as the 'phandle' in OF interface. 148 * 149 * phandle is a u32 value, therefore we cannot use the pointer to node as 150 * phandle in 64 bit. We also do not use the usual fdt offset as phandle, 151 * as it can be 0, and the OF interface has special meaning for phandle 0. 152 */ 153 154 static phandle_t 155 fdt_offset_phandle(int offset) 156 { 157 if (offset < 0) 158 return (0); 159 return ((phandle_t)offset + fdt_off_dt_struct(fdtp)); 160 } 161 162 static int 163 fdt_phandle_offset(phandle_t p) 164 { 165 int pint = (int)p; 166 int dtoff = fdt_off_dt_struct(fdtp); 167 168 if (pint < dtoff) 169 return (-1); 170 return (pint - dtoff); 171 } 172 173 /* Return the next sibling of this node or 0. */ 174 static phandle_t 175 ofw_fdt_peer(ofw_t ofw, phandle_t node) 176 { 177 int offset; 178 179 if (node == 0) { 180 /* Find root node */ 181 offset = fdt_path_offset(fdtp, "/"); 182 183 return (fdt_offset_phandle(offset)); 184 } 185 186 offset = fdt_phandle_offset(node); 187 if (offset < 0) 188 return (0); 189 offset = fdt_next_subnode(fdtp, offset); 190 return (fdt_offset_phandle(offset)); 191 } 192 193 /* Return the first child of this node or 0. */ 194 static phandle_t 195 ofw_fdt_child(ofw_t ofw, phandle_t node) 196 { 197 int offset; 198 199 offset = fdt_phandle_offset(node); 200 if (offset < 0) 201 return (0); 202 offset = fdt_first_subnode(fdtp, offset); 203 return (fdt_offset_phandle(offset)); 204 } 205 206 /* Return the parent of this node or 0. */ 207 static phandle_t 208 ofw_fdt_parent(ofw_t ofw, phandle_t node) 209 { 210 int offset, paroffset; 211 212 offset = fdt_phandle_offset(node); 213 if (offset < 0) 214 return (0); 215 216 paroffset = fdt_parent_offset(fdtp, offset); 217 return (fdt_offset_phandle(paroffset)); 218 } 219 220 /* Return the package handle that corresponds to an instance handle. */ 221 static phandle_t 222 ofw_fdt_instance_to_package(ofw_t ofw, ihandle_t instance) 223 { 224 225 /* Where real OF uses ihandles in the tree, FDT uses xref phandles */ 226 return (OF_node_from_xref(instance)); 227 } 228 229 /* Get the length of a property of a package. */ 230 static ssize_t 231 ofw_fdt_getproplen(ofw_t ofw, phandle_t package, const char *propname) 232 { 233 const void *prop; 234 int offset, len; 235 236 offset = fdt_phandle_offset(package); 237 if (offset < 0) 238 return (-1); 239 240 len = -1; 241 prop = fdt_getprop(fdtp, offset, propname, &len); 242 243 if (prop == NULL && strcmp(propname, "name") == 0) { 244 /* Emulate the 'name' property */ 245 fdt_get_name(fdtp, offset, &len); 246 return (len + 1); 247 } 248 249 if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) { 250 if (strcmp(propname, "fdtbootcpu") == 0) 251 return (sizeof(cell_t)); 252 if (strcmp(propname, "fdtmemreserv") == 0) 253 return (sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp)); 254 } 255 256 if (prop == NULL) 257 return (-1); 258 259 return (len); 260 } 261 262 /* Get the value of a property of a package. */ 263 static ssize_t 264 ofw_fdt_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf, 265 size_t buflen) 266 { 267 const void *prop; 268 const char *name; 269 int len, offset; 270 uint32_t cpuid; 271 272 offset = fdt_phandle_offset(package); 273 if (offset < 0) 274 return (-1); 275 276 prop = fdt_getprop(fdtp, offset, propname, &len); 277 278 if (prop == NULL && strcmp(propname, "name") == 0) { 279 /* Emulate the 'name' property */ 280 name = fdt_get_name(fdtp, offset, &len); 281 strncpy(buf, name, buflen); 282 return (len + 1); 283 } 284 285 if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) { 286 if (strcmp(propname, "fdtbootcpu") == 0) { 287 cpuid = cpu_to_fdt32(fdt_boot_cpuid_phys(fdtp)); 288 len = sizeof(cpuid); 289 prop = &cpuid; 290 } 291 if (strcmp(propname, "fdtmemreserv") == 0) { 292 prop = (char *)fdtp + fdt_off_mem_rsvmap(fdtp); 293 len = sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp); 294 } 295 } 296 297 if (prop == NULL) 298 return (-1); 299 300 bcopy(prop, buf, min(len, buflen)); 301 302 return (len); 303 } 304 305 /* 306 * Get the next property of a package. Return values: 307 * -1: package or previous property does not exist 308 * 0: no more properties 309 * 1: success 310 */ 311 static int 312 ofw_fdt_nextprop(ofw_t ofw, phandle_t package, const char *previous, char *buf, 313 size_t size) 314 { 315 const void *prop; 316 const char *name; 317 int offset; 318 319 offset = fdt_phandle_offset(package); 320 if (offset < 0) 321 return (-1); 322 323 if (previous == NULL) 324 /* Find the first prop in the node */ 325 offset = fdt_first_property_offset(fdtp, offset); 326 else { 327 fdt_for_each_property_offset(offset, fdtp, offset) { 328 prop = fdt_getprop_by_offset(fdtp, offset, &name, NULL); 329 if (prop == NULL) 330 return (-1); /* Internal error */ 331 /* Skip until we find 'previous', then bail out */ 332 if (strcmp(name, previous) != 0) 333 continue; 334 offset = fdt_next_property_offset(fdtp, offset); 335 break; 336 } 337 } 338 339 if (offset < 0) 340 return (0); /* No properties */ 341 342 prop = fdt_getprop_by_offset(fdtp, offset, &name, &offset); 343 if (prop == NULL) 344 return (-1); /* Internal error */ 345 346 strncpy(buf, name, size); 347 348 return (1); 349 } 350 351 /* Set the value of a property of a package. */ 352 static int 353 ofw_fdt_setprop(ofw_t ofw, phandle_t package, const char *propname, 354 const void *buf, size_t len) 355 { 356 int offset; 357 358 offset = fdt_phandle_offset(package); 359 if (offset < 0) 360 return (-1); 361 362 if (fdt_setprop_inplace(fdtp, offset, propname, buf, len) != 0) 363 /* Try to add property, when setting value inplace failed */ 364 return (fdt_setprop(fdtp, offset, propname, buf, len)); 365 366 return (0); 367 } 368 369 /* Convert a device specifier to a fully qualified pathname. */ 370 static ssize_t 371 ofw_fdt_canon(ofw_t ofw, const char *device, char *buf, size_t len) 372 { 373 374 return (-1); 375 } 376 377 /* Return a package handle for the specified device. */ 378 static phandle_t 379 ofw_fdt_finddevice(ofw_t ofw, const char *device) 380 { 381 int offset; 382 383 offset = fdt_path_offset(fdtp, device); 384 if (offset < 0) 385 return (-1); 386 return (fdt_offset_phandle(offset)); 387 } 388 389 /* Return the fully qualified pathname corresponding to an instance. */ 390 static ssize_t 391 ofw_fdt_instance_to_path(ofw_t ofw, ihandle_t instance, char *buf, size_t len) 392 { 393 phandle_t phandle; 394 395 phandle = OF_instance_to_package(instance); 396 if (phandle == -1) 397 return (-1); 398 399 return (OF_package_to_path(phandle, buf, len)); 400 } 401 402 /* Return the fully qualified pathname corresponding to a package. */ 403 static ssize_t 404 ofw_fdt_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len) 405 { 406 407 return (-1); 408 } 409 410 #if defined(FDT_MARVELL) 411 static int 412 ofw_fdt_fixup(ofw_t ofw) 413 { 414 #define FDT_MODEL_LEN 80 415 char model[FDT_MODEL_LEN]; 416 phandle_t root; 417 ssize_t len; 418 int i; 419 420 if ((root = ofw_fdt_finddevice(ofw, "/")) == -1) 421 return (ENODEV); 422 423 if ((len = ofw_fdt_getproplen(ofw, root, "model")) <= 0) 424 return (0); 425 426 bzero(model, FDT_MODEL_LEN); 427 if (ofw_fdt_getprop(ofw, root, "model", model, FDT_MODEL_LEN) <= 0) 428 return (0); 429 430 /* 431 * Search fixup table and call handler if appropriate. 432 */ 433 for (i = 0; fdt_fixup_table[i].model != NULL; i++) { 434 if (strncmp(model, fdt_fixup_table[i].model, 435 FDT_MODEL_LEN) != 0) 436 /* 437 * Sometimes it's convenient to provide one 438 * fixup entry that refers to many boards. 439 * To handle this case, simply check if model 440 * is compatible parameter 441 */ 442 if(!ofw_bus_node_is_compatible(root, 443 fdt_fixup_table[i].model)) 444 continue; 445 446 if (fdt_fixup_table[i].handler != NULL) 447 (*fdt_fixup_table[i].handler)(root); 448 } 449 450 return (0); 451 } 452 #endif 453 454 static int 455 ofw_fdt_interpret(ofw_t ofw, const char *cmd, int nret, cell_t *retvals) 456 { 457 #if defined(FDT_MARVELL) 458 int rv; 459 460 /* 461 * Note: FDT does not have the possibility to 'interpret' commands, 462 * but we abuse the interface a bit to use it for doing non-standard 463 * operations on the device tree blob. 464 * 465 * Currently the only supported 'command' is to trigger performing 466 * fixups. 467 */ 468 if (strncmp("perform-fixup", cmd, 13) != 0) 469 return (0); 470 471 rv = ofw_fdt_fixup(ofw); 472 if (nret > 0) 473 retvals[0] = rv; 474 475 return (rv); 476 #else 477 return (0); 478 #endif 479 } 480