1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * SPDX-License-Identifier: GPL-2.0+ 4 */ 5 6 #ifndef __fdtdec_h 7 #define __fdtdec_h 8 9 /* 10 * This file contains convenience functions for decoding useful and 11 * enlightening information from FDTs. It is intended to be used by device 12 * drivers and board-specific code within U-Boot. It aims to reduce the 13 * amount of FDT munging required within U-Boot itself, so that driver code 14 * changes to support FDT are minimized. 15 */ 16 17 #include <libfdt.h> 18 19 /* 20 * A typedef for a physical address. Note that fdt data is always big 21 * endian even on a litle endian machine. 22 */ 23 #ifdef CONFIG_PHYS_64BIT 24 typedef u64 fdt_addr_t; 25 typedef u64 fdt_size_t; 26 #define FDT_ADDR_T_NONE (-1ULL) 27 #define fdt_addr_to_cpu(reg) be64_to_cpu(reg) 28 #define fdt_size_to_cpu(reg) be64_to_cpu(reg) 29 #else 30 typedef u32 fdt_addr_t; 31 typedef u32 fdt_size_t; 32 #define FDT_ADDR_T_NONE (-1U) 33 #define fdt_addr_to_cpu(reg) be32_to_cpu(reg) 34 #define fdt_size_to_cpu(reg) be32_to_cpu(reg) 35 #endif 36 37 /* Information obtained about memory from the FDT */ 38 struct fdt_memory { 39 fdt_addr_t start; 40 fdt_addr_t end; 41 }; 42 43 /* 44 * Information about a resource. start is the first address of the resource 45 * and end is the last address (inclusive). The length of the resource will 46 * be equal to: end - start + 1. 47 */ 48 struct fdt_resource { 49 fdt_addr_t start; 50 fdt_addr_t end; 51 }; 52 53 /** 54 * Compute the size of a resource. 55 * 56 * @param res the resource to operate on 57 * @return the size of the resource 58 */ 59 static inline fdt_size_t fdt_resource_size(const struct fdt_resource *res) 60 { 61 return res->end - res->start + 1; 62 } 63 64 /** 65 * Compat types that we know about and for which we might have drivers. 66 * Each is named COMPAT_<dir>_<filename> where <dir> is the directory 67 * within drivers. 68 */ 69 enum fdt_compat_id { 70 COMPAT_UNKNOWN, 71 COMPAT_NVIDIA_TEGRA20_USB, /* Tegra20 USB port */ 72 COMPAT_NVIDIA_TEGRA30_USB, /* Tegra30 USB port */ 73 COMPAT_NVIDIA_TEGRA114_USB, /* Tegra114 USB port */ 74 COMPAT_NVIDIA_TEGRA114_I2C, /* Tegra114 I2C w/single clock source */ 75 COMPAT_NVIDIA_TEGRA20_I2C, /* Tegra20 i2c */ 76 COMPAT_NVIDIA_TEGRA20_DVC, /* Tegra20 dvc (really just i2c) */ 77 COMPAT_NVIDIA_TEGRA20_EMC, /* Tegra20 memory controller */ 78 COMPAT_NVIDIA_TEGRA20_EMC_TABLE, /* Tegra20 memory timing table */ 79 COMPAT_NVIDIA_TEGRA20_KBC, /* Tegra20 Keyboard */ 80 COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */ 81 COMPAT_NVIDIA_TEGRA20_PWM, /* Tegra 2 PWM controller */ 82 COMPAT_NVIDIA_TEGRA20_DC, /* Tegra 2 Display controller */ 83 COMPAT_NVIDIA_TEGRA124_SDMMC, /* Tegra124 SDMMC controller */ 84 COMPAT_NVIDIA_TEGRA30_SDMMC, /* Tegra30 SDMMC controller */ 85 COMPAT_NVIDIA_TEGRA20_SDMMC, /* Tegra20 SDMMC controller */ 86 COMPAT_NVIDIA_TEGRA20_SFLASH, /* Tegra 2 SPI flash controller */ 87 COMPAT_NVIDIA_TEGRA20_SLINK, /* Tegra 2 SPI SLINK controller */ 88 COMPAT_NVIDIA_TEGRA114_SPI, /* Tegra 114 SPI controller */ 89 COMPAT_SMSC_LAN9215, /* SMSC 10/100 Ethernet LAN9215 */ 90 COMPAT_SAMSUNG_EXYNOS5_SROMC, /* Exynos5 SROMC */ 91 COMPAT_SAMSUNG_S3C2440_I2C, /* Exynos I2C Controller */ 92 COMPAT_SAMSUNG_EXYNOS5_SOUND, /* Exynos Sound */ 93 COMPAT_WOLFSON_WM8994_CODEC, /* Wolfson WM8994 Sound Codec */ 94 COMPAT_SAMSUNG_EXYNOS_SPI, /* Exynos SPI */ 95 COMPAT_GOOGLE_CROS_EC, /* Google CROS_EC Protocol */ 96 COMPAT_GOOGLE_CROS_EC_KEYB, /* Google CROS_EC Keyboard */ 97 COMPAT_SAMSUNG_EXYNOS_EHCI, /* Exynos EHCI controller */ 98 COMPAT_SAMSUNG_EXYNOS5_XHCI, /* Exynos5 XHCI controller */ 99 COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */ 100 COMPAT_SAMSUNG_EXYNOS5_USB3_PHY,/* Exynos phy controller for usb3.0 */ 101 COMPAT_SAMSUNG_EXYNOS_TMU, /* Exynos TMU */ 102 COMPAT_SAMSUNG_EXYNOS_FIMD, /* Exynos Display controller */ 103 COMPAT_SAMSUNG_EXYNOS_MIPI_DSI, /* Exynos mipi dsi */ 104 COMPAT_SAMSUNG_EXYNOS5_DP, /* Exynos Display port controller */ 105 COMPAT_SAMSUNG_EXYNOS_DWMMC, /* Exynos DWMMC controller */ 106 COMPAT_SAMSUNG_EXYNOS_MMC, /* Exynos MMC controller */ 107 COMPAT_SAMSUNG_EXYNOS_SERIAL, /* Exynos UART */ 108 COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */ 109 COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */ 110 COMPAT_MAXIM_98095_CODEC, /* MAX98095 Codec */ 111 COMPAT_INFINEON_SLB9635_TPM, /* Infineon SLB9635 TPM */ 112 COMPAT_INFINEON_SLB9645_TPM, /* Infineon SLB9645 TPM */ 113 COMPAT_SAMSUNG_EXYNOS5_I2C, /* Exynos5 High Speed I2C Controller */ 114 COMPAT_SANDBOX_HOST_EMULATION, /* Sandbox emulation of a function */ 115 COMPAT_SANDBOX_LCD_SDL, /* Sandbox LCD emulation with SDL */ 116 COMPAT_TI_TPS65090, /* Texas Instrument TPS65090 */ 117 COMPAT_NXP_PTN3460, /* NXP PTN3460 DP/LVDS bridge */ 118 COMPAT_SAMSUNG_EXYNOS_SYSMMU, /* Exynos sysmmu */ 119 COMPAT_PARADE_PS8625, /* Parade PS8622 EDP->LVDS bridge */ 120 COMPAT_INTEL_LPC, /* Intel Low Pin Count I/F */ 121 122 COMPAT_COUNT, 123 }; 124 125 /* GPIOs are numbered from 0 */ 126 enum { 127 FDT_GPIO_NONE = -1U, /* an invalid GPIO used to end our list */ 128 129 FDT_GPIO_ACTIVE_LOW = 1 << 0, /* input is active low (else high) */ 130 }; 131 132 /* This is the state of a GPIO pin as defined by the fdt */ 133 struct fdt_gpio_state { 134 const char *name; /* name of the fdt property defining this */ 135 uint gpio; /* GPIO number, or FDT_GPIO_NONE if none */ 136 u8 flags; /* FDT_GPIO_... flags */ 137 }; 138 139 /* This tells us whether a fdt_gpio_state record is valid or not */ 140 #define fdt_gpio_isvalid(x) ((x)->gpio != FDT_GPIO_NONE) 141 142 /** 143 * Read the GPIO taking into account the polarity of the pin. 144 * 145 * @param gpio pointer to the decoded gpio 146 * @return value of the gpio if successful, < 0 if unsuccessful 147 */ 148 int fdtdec_get_gpio(struct fdt_gpio_state *gpio); 149 150 /** 151 * Write the GPIO taking into account the polarity of the pin. 152 * 153 * @param gpio pointer to the decoded gpio 154 * @return 0 if successful 155 */ 156 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val); 157 158 /** 159 * Find the next numbered alias for a peripheral. This is used to enumerate 160 * all the peripherals of a certain type. 161 * 162 * Do the first call with *upto = 0. Assuming /aliases/<name>0 exists then 163 * this function will return a pointer to the node the alias points to, and 164 * then update *upto to 1. Next time you call this function, the next node 165 * will be returned. 166 * 167 * All nodes returned will match the compatible ID, as it is assumed that 168 * all peripherals use the same driver. 169 * 170 * @param blob FDT blob to use 171 * @param name Root name of alias to search for 172 * @param id Compatible ID to look for 173 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more 174 */ 175 int fdtdec_next_alias(const void *blob, const char *name, 176 enum fdt_compat_id id, int *upto); 177 178 /** 179 * Find the compatible ID for a given node. 180 * 181 * Generally each node has at least one compatible string attached to it. 182 * This function looks through our list of known compatible strings and 183 * returns the corresponding ID which matches the compatible string. 184 * 185 * @param blob FDT blob to use 186 * @param node Node containing compatible string to find 187 * @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match 188 */ 189 enum fdt_compat_id fdtdec_lookup(const void *blob, int node); 190 191 /** 192 * Find the next compatible node for a peripheral. 193 * 194 * Do the first call with node = 0. This function will return a pointer to 195 * the next compatible node. Next time you call this function, pass the 196 * value returned, and the next node will be provided. 197 * 198 * @param blob FDT blob to use 199 * @param node Start node for search 200 * @param id Compatible ID to look for (enum fdt_compat_id) 201 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more 202 */ 203 int fdtdec_next_compatible(const void *blob, int node, 204 enum fdt_compat_id id); 205 206 /** 207 * Find the next compatible subnode for a peripheral. 208 * 209 * Do the first call with node set to the parent and depth = 0. This 210 * function will return the offset of the next compatible node. Next time 211 * you call this function, pass the node value returned last time, with 212 * depth unchanged, and the next node will be provided. 213 * 214 * @param blob FDT blob to use 215 * @param node Start node for search 216 * @param id Compatible ID to look for (enum fdt_compat_id) 217 * @param depthp Current depth (set to 0 before first call) 218 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more 219 */ 220 int fdtdec_next_compatible_subnode(const void *blob, int node, 221 enum fdt_compat_id id, int *depthp); 222 223 /** 224 * Look up an address property in a node and return it as an address. 225 * The property must hold either one address with no trailing data or 226 * one address with a length. This is only tested on 32-bit machines. 227 * 228 * @param blob FDT blob 229 * @param node node to examine 230 * @param prop_name name of property to find 231 * @return address, if found, or FDT_ADDR_T_NONE if not 232 */ 233 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 234 const char *prop_name); 235 236 /** 237 * Look up an address property in a node and return it as an address. 238 * The property must hold one address with a length. This is only tested 239 * on 32-bit machines. 240 * 241 * @param blob FDT blob 242 * @param node node to examine 243 * @param prop_name name of property to find 244 * @return address, if found, or FDT_ADDR_T_NONE if not 245 */ 246 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 247 const char *prop_name, fdt_size_t *sizep); 248 249 /** 250 * Look up a 32-bit integer property in a node and return it. The property 251 * must have at least 4 bytes of data. The value of the first cell is 252 * returned. 253 * 254 * @param blob FDT blob 255 * @param node node to examine 256 * @param prop_name name of property to find 257 * @param default_val default value to return if the property is not found 258 * @return integer value, if found, or default_val if not 259 */ 260 s32 fdtdec_get_int(const void *blob, int node, const char *prop_name, 261 s32 default_val); 262 263 /** 264 * Look up a 64-bit integer property in a node and return it. The property 265 * must have at least 8 bytes of data (2 cells). The first two cells are 266 * concatenated to form a 8 bytes value, where the first cell is top half and 267 * the second cell is bottom half. 268 * 269 * @param blob FDT blob 270 * @param node node to examine 271 * @param prop_name name of property to find 272 * @param default_val default value to return if the property is not found 273 * @return integer value, if found, or default_val if not 274 */ 275 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 276 uint64_t default_val); 277 278 /** 279 * Checks whether a node is enabled. 280 * This looks for a 'status' property. If this exists, then returns 1 if 281 * the status is 'ok' and 0 otherwise. If there is no status property, 282 * it returns 1 on the assumption that anything mentioned should be enabled 283 * by default. 284 * 285 * @param blob FDT blob 286 * @param node node to examine 287 * @return integer value 0 (not enabled) or 1 (enabled) 288 */ 289 int fdtdec_get_is_enabled(const void *blob, int node); 290 291 /** 292 * Make sure we have a valid fdt available to control U-Boot. 293 * 294 * If not, a message is printed to the console if the console is ready. 295 * 296 * @return 0 if all ok, -1 if not 297 */ 298 int fdtdec_prepare_fdt(void); 299 300 /** 301 * Checks that we have a valid fdt available to control U-Boot. 302 303 * However, if not then for the moment nothing is done, since this function 304 * is called too early to panic(). 305 * 306 * @returns 0 307 */ 308 int fdtdec_check_fdt(void); 309 310 /** 311 * Find the nodes for a peripheral and return a list of them in the correct 312 * order. This is used to enumerate all the peripherals of a certain type. 313 * 314 * To use this, optionally set up a /aliases node with alias properties for 315 * a peripheral. For example, for usb you could have: 316 * 317 * aliases { 318 * usb0 = "/ehci@c5008000"; 319 * usb1 = "/ehci@c5000000"; 320 * }; 321 * 322 * Pass "usb" as the name to this function and will return a list of two 323 * nodes offsets: /ehci@c5008000 and ehci@c5000000. 324 * 325 * All nodes returned will match the compatible ID, as it is assumed that 326 * all peripherals use the same driver. 327 * 328 * If no alias node is found, then the node list will be returned in the 329 * order found in the fdt. If the aliases mention a node which doesn't 330 * exist, then this will be ignored. If nodes are found with no aliases, 331 * they will be added in any order. 332 * 333 * If there is a gap in the aliases, then this function return a 0 node at 334 * that position. The return value will also count these gaps. 335 * 336 * This function checks node properties and will not return nodes which are 337 * marked disabled (status = "disabled"). 338 * 339 * @param blob FDT blob to use 340 * @param name Root name of alias to search for 341 * @param id Compatible ID to look for 342 * @param node_list Place to put list of found nodes 343 * @param maxcount Maximum number of nodes to find 344 * @return number of nodes found on success, FTD_ERR_... on error 345 */ 346 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 347 enum fdt_compat_id id, int *node_list, int maxcount); 348 349 /* 350 * This function is similar to fdtdec_find_aliases_for_id() except that it 351 * adds to the node_list that is passed in. Any 0 elements are considered 352 * available for allocation - others are considered already used and are 353 * skipped. 354 * 355 * You can use this by calling fdtdec_find_aliases_for_id() with an 356 * uninitialised array, then setting the elements that are returned to -1, 357 * say, then calling this function, perhaps with a different compat id. 358 * Any elements you get back that are >0 are new nodes added by the call 359 * to this function. 360 * 361 * Note that if you have some nodes with aliases and some without, you are 362 * sailing close to the wind. The call to fdtdec_find_aliases_for_id() with 363 * one compat_id may fill in positions for which you have aliases defined 364 * for another compat_id. When you later call *this* function with the second 365 * compat_id, the alias positions may already be used. A debug warning may 366 * be generated in this case, but it is safest to define aliases for all 367 * nodes when you care about the ordering. 368 */ 369 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 370 enum fdt_compat_id id, int *node_list, int maxcount); 371 372 /** 373 * Get the alias sequence number of a node 374 * 375 * This works out whether a node is pointed to by an alias, and if so, the 376 * sequence number of that alias. Aliases are of the form <base><num> where 377 * <num> is the sequence number. For example spi2 would be sequence number 378 * 2. 379 * 380 * @param blob Device tree blob (if NULL, then error is returned) 381 * @param base Base name for alias (before the underscore) 382 * @param node Node to look up 383 * @param seqp This is set to the sequence number if one is found, 384 * but otherwise the value is left alone 385 * @return 0 if a sequence was found, -ve if not 386 */ 387 int fdtdec_get_alias_seq(const void *blob, const char *base, int node, 388 int *seqp); 389 390 /** 391 * Get the offset of the given alias node 392 * 393 * This looks up an alias in /aliases then finds the offset of that node. 394 * 395 * @param blob Device tree blob (if NULL, then error is returned) 396 * @param name Alias name, e.g. "console" 397 * @return Node offset referred to by that alias, or -ve FDT_ERR_... 398 */ 399 int fdtdec_get_alias_node(const void *blob, const char *name); 400 401 /** 402 * Get the offset of the given chosen node 403 * 404 * This looks up a property in /chosen containing the path to another node, 405 * then finds the offset of that node. 406 * 407 * @param blob Device tree blob (if NULL, then error is returned) 408 * @param name Property name, e.g. "stdout-path" 409 * @return Node offset referred to by that chosen node, or -ve FDT_ERR_... 410 */ 411 int fdtdec_get_chosen_node(const void *blob, const char *name); 412 413 /* 414 * Get the name for a compatible ID 415 * 416 * @param id Compatible ID to look for 417 * @return compatible string for that id 418 */ 419 const char *fdtdec_get_compatible(enum fdt_compat_id id); 420 421 /* Look up a phandle and follow it to its node. Then return the offset 422 * of that node. 423 * 424 * @param blob FDT blob 425 * @param node node to examine 426 * @param prop_name name of property to find 427 * @return node offset if found, -ve error code on error 428 */ 429 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name); 430 431 /** 432 * Look up a property in a node and return its contents in an integer 433 * array of given length. The property must have at least enough data for 434 * the array (4*count bytes). It may have more, but this will be ignored. 435 * 436 * @param blob FDT blob 437 * @param node node to examine 438 * @param prop_name name of property to find 439 * @param array array to fill with data 440 * @param count number of array elements 441 * @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found, 442 * or -FDT_ERR_BADLAYOUT if not enough data 443 */ 444 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 445 u32 *array, int count); 446 447 /** 448 * Look up a property in a node and return a pointer to its contents as a 449 * unsigned int array of given length. The property must have at least enough 450 * data for the array ('count' cells). It may have more, but this will be 451 * ignored. The data is not copied. 452 * 453 * Note that you must access elements of the array with fdt32_to_cpu(), 454 * since the elements will be big endian even on a little endian machine. 455 * 456 * @param blob FDT blob 457 * @param node node to examine 458 * @param prop_name name of property to find 459 * @param count number of array elements 460 * @return pointer to array if found, or NULL if the property is not 461 * found or there is not enough data 462 */ 463 const u32 *fdtdec_locate_array(const void *blob, int node, 464 const char *prop_name, int count); 465 466 /** 467 * Look up a boolean property in a node and return it. 468 * 469 * A boolean properly is true if present in the device tree and false if not 470 * present, regardless of its value. 471 * 472 * @param blob FDT blob 473 * @param node node to examine 474 * @param prop_name name of property to find 475 * @return 1 if the properly is present; 0 if it isn't present 476 */ 477 int fdtdec_get_bool(const void *blob, int node, const char *prop_name); 478 479 /** 480 * Decode a single GPIOs from an FDT. 481 * 482 * If the property is not found, then the GPIO structure will still be 483 * initialised, with gpio set to FDT_GPIO_NONE. This makes it easy to 484 * provide optional GPIOs. 485 * 486 * @param blob FDT blob to use 487 * @param node Node to look at 488 * @param prop_name Node property name 489 * @param gpio gpio elements to fill from FDT 490 * @return 0 if ok, -FDT_ERR_NOTFOUND if the property is missing. 491 */ 492 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name, 493 struct fdt_gpio_state *gpio); 494 495 /** 496 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no 497 * terminating item. 498 * 499 * @param blob FDT blob to use 500 * @param node Node to look at 501 * @param prop_name Node property name 502 * @param gpio Array of gpio elements to fill from FDT. This will be 503 * untouched if either 0 or an error is returned 504 * @param max_count Maximum number of elements allowed 505 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would 506 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing. 507 */ 508 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name, 509 struct fdt_gpio_state *gpio, int max_count); 510 511 /** 512 * Set up a GPIO pin according to the provided gpio information. At present this 513 * just requests the GPIO. 514 * 515 * If the gpio is FDT_GPIO_NONE, no action is taken. This makes it easy to 516 * deal with optional GPIOs. 517 * 518 * @param gpio GPIO info to use for set up 519 * @return 0 if all ok or gpio was FDT_GPIO_NONE; -1 on error 520 */ 521 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio); 522 523 /** 524 * Look in the FDT for a config item with the given name and return its value 525 * as a 32-bit integer. The property must have at least 4 bytes of data. The 526 * value of the first cell is returned. 527 * 528 * @param blob FDT blob to use 529 * @param prop_name Node property name 530 * @param default_val default value to return if the property is not found 531 * @return integer value, if found, or default_val if not 532 */ 533 int fdtdec_get_config_int(const void *blob, const char *prop_name, 534 int default_val); 535 536 /** 537 * Look in the FDT for a config item with the given name 538 * and return whether it exists. 539 * 540 * @param blob FDT blob 541 * @param prop_name property name to look up 542 * @return 1, if it exists, or 0 if not 543 */ 544 int fdtdec_get_config_bool(const void *blob, const char *prop_name); 545 546 /** 547 * Look in the FDT for a config item with the given name and return its value 548 * as a string. 549 * 550 * @param blob FDT blob 551 * @param prop_name property name to look up 552 * @returns property string, NULL on error. 553 */ 554 char *fdtdec_get_config_string(const void *blob, const char *prop_name); 555 556 /* 557 * Look up a property in a node and return its contents in a byte 558 * array of given length. The property must have at least enough data for 559 * the array (count bytes). It may have more, but this will be ignored. 560 * 561 * @param blob FDT blob 562 * @param node node to examine 563 * @param prop_name name of property to find 564 * @param array array to fill with data 565 * @param count number of array elements 566 * @return 0 if ok, or -FDT_ERR_MISSING if the property is not found, 567 * or -FDT_ERR_BADLAYOUT if not enough data 568 */ 569 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 570 u8 *array, int count); 571 572 /** 573 * Look up a property in a node and return a pointer to its contents as a 574 * byte array of given length. The property must have at least enough data 575 * for the array (count bytes). It may have more, but this will be ignored. 576 * The data is not copied. 577 * 578 * @param blob FDT blob 579 * @param node node to examine 580 * @param prop_name name of property to find 581 * @param count number of array elements 582 * @return pointer to byte array if found, or NULL if the property is not 583 * found or there is not enough data 584 */ 585 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 586 const char *prop_name, int count); 587 588 /** 589 * Look up a property in a node which contains a memory region address and 590 * size. Then return a pointer to this address. 591 * 592 * The property must hold one address with a length. This is only tested on 593 * 32-bit machines. 594 * 595 * @param blob FDT blob 596 * @param node node to examine 597 * @param prop_name name of property to find 598 * @param ptrp returns pointer to region, or NULL if no address 599 * @param size returns size of region 600 * @return 0 if ok, -1 on error (propery not found) 601 */ 602 int fdtdec_decode_region(const void *blob, int node, 603 const char *prop_name, void **ptrp, size_t *size); 604 605 /* A flash map entry, containing an offset and length */ 606 struct fmap_entry { 607 uint32_t offset; 608 uint32_t length; 609 }; 610 611 /** 612 * Read a flash entry from the fdt 613 * 614 * @param blob FDT blob 615 * @param node Offset of node to read 616 * @param name Name of node being read 617 * @param entry Place to put offset and size of this node 618 * @return 0 if ok, -ve on error 619 */ 620 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 621 struct fmap_entry *entry); 622 623 /** 624 * Obtain an indexed resource from a device property. 625 * 626 * @param fdt FDT blob 627 * @param node node to examine 628 * @param property name of the property to parse 629 * @param index index of the resource to retrieve 630 * @param res returns the resource 631 * @return 0 if ok, negative on error 632 */ 633 int fdt_get_resource(const void *fdt, int node, const char *property, 634 unsigned int index, struct fdt_resource *res); 635 636 /** 637 * Obtain a named resource from a device property. 638 * 639 * Look up the index of the name in a list of strings and return the resource 640 * at that index. 641 * 642 * @param fdt FDT blob 643 * @param node node to examine 644 * @param property name of the property to parse 645 * @param prop_names name of the property containing the list of names 646 * @param name the name of the entry to look up 647 * @param res returns the resource 648 */ 649 int fdt_get_named_resource(const void *fdt, int node, const char *property, 650 const char *prop_names, const char *name, 651 struct fdt_resource *res); 652 653 /** 654 * Look at the reg property of a device node that represents a PCI device 655 * and parse the bus, device and function number from it. 656 * 657 * @param fdt FDT blob 658 * @param node node to examine 659 * @param bdf returns bus, device, function triplet 660 * @return 0 if ok, negative on error 661 */ 662 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf); 663 664 #endif 665