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Simon Glassb5220bc2011-10-24 19:15:32 +00001/*
2 * Copyright (c) 2011 The Chromium OS Authors.
Wolfgang Denk1a459662013-07-08 09:37:19 +02003 * SPDX-License-Identifier: GPL-2.0+
Simon Glassb5220bc2011-10-24 19:15:32 +00004 */
5
Simon Glass5bfa78d2012-07-12 05:25:02 +00006#ifndef __fdtdec_h
7#define __fdtdec_h
Simon Glassb5220bc2011-10-24 19:15:32 +00008
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
24typedef u64 fdt_addr_t;
Simon Glass4397a2a2013-03-19 04:58:51 +000025typedef u64 fdt_size_t;
Simon Glassb5220bc2011-10-24 19:15:32 +000026#define FDT_ADDR_T_NONE (-1ULL)
27#define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
Simon Glassf20c4612012-10-25 16:31:00 +000028#define fdt_size_to_cpu(reg) be64_to_cpu(reg)
Simon Glassb5220bc2011-10-24 19:15:32 +000029#else
30typedef u32 fdt_addr_t;
Simon Glass4397a2a2013-03-19 04:58:51 +000031typedef u32 fdt_size_t;
Simon Glassb5220bc2011-10-24 19:15:32 +000032#define FDT_ADDR_T_NONE (-1U)
33#define fdt_addr_to_cpu(reg) be32_to_cpu(reg)
Simon Glassf20c4612012-10-25 16:31:00 +000034#define fdt_size_to_cpu(reg) be32_to_cpu(reg)
Simon Glassb5220bc2011-10-24 19:15:32 +000035#endif
36
37/* Information obtained about memory from the FDT */
38struct fdt_memory {
39 fdt_addr_t start;
40 fdt_addr_t end;
41};
42
Thierry Reding56f42242014-08-26 17:33:53 +020043/*
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 */
48struct 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 */
59static inline fdt_size_t fdt_resource_size(const struct fdt_resource *res)
60{
61 return res->end - res->start + 1;
62}
63
Simon Glassb5220bc2011-10-24 19:15:32 +000064/**
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 */
69enum fdt_compat_id {
70 COMPAT_UNKNOWN,
Allen Martin00a27492012-08-31 08:30:00 +000071 COMPAT_NVIDIA_TEGRA20_USB, /* Tegra20 USB port */
Jim Lin7e44d932013-06-21 19:05:47 +080072 COMPAT_NVIDIA_TEGRA30_USB, /* Tegra30 USB port */
73 COMPAT_NVIDIA_TEGRA114_USB, /* Tegra114 USB port */
Tom Warrene32624e2013-02-08 07:25:30 +000074 COMPAT_NVIDIA_TEGRA114_I2C, /* Tegra114 I2C w/single clock source */
Allen Martin00a27492012-08-31 08:30:00 +000075 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 */
Jim Lin312693c2012-07-29 20:53:29 +000080 COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */
Simon Glasse1ae0d12012-10-17 13:24:49 +000081 COMPAT_NVIDIA_TEGRA20_PWM, /* Tegra 2 PWM controller */
Wei Ni87540de2012-10-17 13:24:50 +000082 COMPAT_NVIDIA_TEGRA20_DC, /* Tegra 2 Display controller */
Stephen Warrena73ca472014-01-24 12:46:06 -070083 COMPAT_NVIDIA_TEGRA124_SDMMC, /* Tegra124 SDMMC controller */
Tom Warrenf4e4e0b2013-03-04 14:07:18 -070084 COMPAT_NVIDIA_TEGRA30_SDMMC, /* Tegra30 SDMMC controller */
85 COMPAT_NVIDIA_TEGRA20_SDMMC, /* Tegra20 SDMMC controller */
Allen Martin8f1b46b2013-01-29 13:51:24 +000086 COMPAT_NVIDIA_TEGRA20_SFLASH, /* Tegra 2 SPI flash controller */
Allen Martinb19f5742013-01-29 13:51:28 +000087 COMPAT_NVIDIA_TEGRA20_SLINK, /* Tegra 2 SPI SLINK controller */
Allen Martinc3bb3c82013-03-16 18:58:09 +000088 COMPAT_NVIDIA_TEGRA114_SPI, /* Tegra 114 SPI controller */
Hatim RVcc9fe332012-12-11 00:52:46 +000089 COMPAT_SMSC_LAN9215, /* SMSC 10/100 Ethernet LAN9215 */
90 COMPAT_SAMSUNG_EXYNOS5_SROMC, /* Exynos5 SROMC */
Rajeshwari Shindec34253d2012-12-26 20:03:10 +000091 COMPAT_SAMSUNG_S3C2440_I2C, /* Exynos I2C Controller */
Rajeshwari Shinde72dbff12012-12-26 20:03:16 +000092 COMPAT_SAMSUNG_EXYNOS5_SOUND, /* Exynos Sound */
93 COMPAT_WOLFSON_WM8994_CODEC, /* Wolfson WM8994 Sound Codec */
Rajeshwari Shinde5d506592012-12-26 20:03:20 +000094 COMPAT_SAMSUNG_EXYNOS_SPI, /* Exynos SPI */
Hung-ying Tyan88364382013-05-15 18:27:28 +080095 COMPAT_GOOGLE_CROS_EC, /* Google CROS_EC Protocol */
Hung-ying Tyan713cb682013-05-15 18:27:32 +080096 COMPAT_GOOGLE_CROS_EC_KEYB, /* Google CROS_EC Keyboard */
Rajeshwari Shinde6abd1622013-01-07 23:35:05 +000097 COMPAT_SAMSUNG_EXYNOS_EHCI, /* Exynos EHCI controller */
Vivek Gautam108b85b2013-09-14 14:02:48 +053098 COMPAT_SAMSUNG_EXYNOS5_XHCI, /* Exynos5 XHCI controller */
Rajeshwari Shinde6abd1622013-01-07 23:35:05 +000099 COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */
Vivek Gautam108b85b2013-09-14 14:02:48 +0530100 COMPAT_SAMSUNG_EXYNOS5_USB3_PHY,/* Exynos phy controller for usb3.0 */
Akshay Saraswat618766c2013-02-25 01:13:01 +0000101 COMPAT_SAMSUNG_EXYNOS_TMU, /* Exynos TMU */
Ajay Kumard7377b52013-02-21 23:53:00 +0000102 COMPAT_SAMSUNG_EXYNOS_FIMD, /* Exynos Display controller */
Piotr Wilczekde461c52014-03-07 14:59:39 +0100103 COMPAT_SAMSUNG_EXYNOS_MIPI_DSI, /* Exynos mipi dsi */
Ajay Kumar1e4706a2013-02-21 23:53:05 +0000104 COMPAT_SAMSUNG_EXYNOS5_DP, /* Exynos Display port controller */
Jaehoon Chung7d3ca0f2014-05-16 13:59:51 +0900105 COMPAT_SAMSUNG_EXYNOS_DWMMC, /* Exynos DWMMC controller */
Piotr Wilczek3577fe82014-03-07 14:59:41 +0100106 COMPAT_SAMSUNG_EXYNOS_MMC, /* Exynos MMC controller */
Rajeshwari Shindeee1e3c22013-06-24 16:47:20 +0530107 COMPAT_SAMSUNG_EXYNOS_SERIAL, /* Exynos UART */
Rajeshwari Shindecd577e22013-01-08 21:03:38 +0000108 COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */
Simon Glassbb8215f2013-03-11 06:08:08 +0000109 COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */
Rajeshwari Shinde7772bb72013-02-14 19:46:15 +0000110 COMPAT_MAXIM_98095_CODEC, /* MAX98095 Codec */
Rong Changf6267992013-04-12 10:44:57 +0000111 COMPAT_INFINEON_SLB9635_TPM, /* Infineon SLB9635 TPM */
Vincent Palatinec34fa52013-04-12 11:04:36 +0000112 COMPAT_INFINEON_SLB9645_TPM, /* Infineon SLB9645 TPM */
naveen krishna chatradhiecbd7e12013-04-29 15:58:52 -0700113 COMPAT_SAMSUNG_EXYNOS5_I2C, /* Exynos5 High Speed I2C Controller */
Simon Glassdf93d902014-02-27 13:26:12 -0700114 COMPAT_SANDBOX_HOST_EMULATION, /* Sandbox emulation of a function */
Simon Glass7d95f2a2014-02-27 13:26:19 -0700115 COMPAT_SANDBOX_LCD_SDL, /* Sandbox LCD emulation with SDL */
Tom Wai-Hong Tamac1058f2014-05-20 06:01:36 -0600116 COMPAT_TI_TPS65090, /* Texas Instrument TPS65090 */
Simon Glassa9cf6da2014-05-20 06:01:42 -0600117 COMPAT_NXP_PTN3460, /* NXP PTN3460 DP/LVDS bridge */
Ajay Kumar45c480c2014-09-05 16:53:33 +0530118 COMPAT_SAMSUNG_EXYNOS_SYSMMU, /* Exynos sysmmu */
Vadim Bendebury9e8f6642014-09-05 16:53:34 +0530119 COMPAT_PARADE_PS8625, /* Parade PS8622 EDP->LVDS bridge */
Simon Glassca42d3f2014-10-10 07:30:14 -0600120 COMPAT_INTEL_LPC, /* Intel Low Pin Count I/F */
Simon Glassb5220bc2011-10-24 19:15:32 +0000121
122 COMPAT_COUNT,
123};
124
Simon Glassed3ee5c2012-02-27 10:52:36 +0000125/* GPIOs are numbered from 0 */
126enum {
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 */
133struct 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
Simon Glassb5220bc2011-10-24 19:15:32 +0000142/**
Sean Paul202ff752012-10-25 16:31:06 +0000143 * 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 */
148int 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 */
156int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val);
157
158/**
Simon Glassb5220bc2011-10-24 19:15:32 +0000159 * 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 */
175int fdtdec_next_alias(const void *blob, const char *name,
176 enum fdt_compat_id id, int *upto);
177
178/**
Gerald Van Baren7cde3972012-11-12 23:13:54 -0500179 * 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 */
189enum fdt_compat_id fdtdec_lookup(const void *blob, int node);
190
191/**
Simon Glassf88fe2d2012-02-27 10:52:34 +0000192 * 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 */
203int fdtdec_next_compatible(const void *blob, int node,
204 enum fdt_compat_id id);
205
206/**
Simon Glass3ddecfc2012-04-02 13:18:42 +0000207 * 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 */
220int fdtdec_next_compatible_subnode(const void *blob, int node,
221 enum fdt_compat_id id, int *depthp);
222
223/**
Simon Glassb5220bc2011-10-24 19:15:32 +0000224 * 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 */
233fdt_addr_t fdtdec_get_addr(const void *blob, int node,
234 const char *prop_name);
235
236/**
Simon Glass4397a2a2013-03-19 04:58:51 +0000237 * 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 */
246fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
247 const char *prop_name, fdt_size_t *sizep);
248
249/**
Simon Glassb5220bc2011-10-24 19:15:32 +0000250 * 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 */
260s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
261 s32 default_val);
262
263/**
Che-Liang Chiouaadef0a2012-10-25 16:31:05 +0000264 * 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 */
275uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
276 uint64_t default_val);
277
278/**
Simon Glassb5220bc2011-10-24 19:15:32 +0000279 * 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,
Simon Glassf88fe2d2012-02-27 10:52:34 +0000282 * it returns 1 on the assumption that anything mentioned should be enabled
283 * by default.
Simon Glassb5220bc2011-10-24 19:15:32 +0000284 *
285 * @param blob FDT blob
286 * @param node node to examine
Simon Glassf88fe2d2012-02-27 10:52:34 +0000287 * @return integer value 0 (not enabled) or 1 (enabled)
Simon Glassb5220bc2011-10-24 19:15:32 +0000288 */
Simon Glassf88fe2d2012-02-27 10:52:34 +0000289int fdtdec_get_is_enabled(const void *blob, int node);
Simon Glassb5220bc2011-10-24 19:15:32 +0000290
291/**
Simon Glass9a263e52012-03-28 10:08:24 +0000292 * 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 */
298int 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
Simon Glassb5220bc2011-10-24 19:15:32 +0000307 */
308int fdtdec_check_fdt(void);
Simon Glassa53f4a22012-01-17 08:20:50 +0000309
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 */
346int fdtdec_find_aliases_for_id(const void *blob, const char *name,
347 enum fdt_compat_id id, int *node_list, int maxcount);
348
349/*
Simon Glassc6782272012-02-03 15:13:53 +0000350 * 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 */
369int fdtdec_add_aliases_for_id(const void *blob, const char *name,
370 enum fdt_compat_id id, int *node_list, int maxcount);
371
Simon Glass5c33c9f2014-07-23 06:55:09 -0600372/**
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 */
387int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
388 int *seqp);
389
Simon Glass3234aa42014-07-23 06:55:16 -0600390/**
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 */
399int fdtdec_get_alias_node(const void *blob, const char *name);
400
Simon Glassaac07d42014-09-04 16:27:24 -0600401/**
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 */
411int fdtdec_get_chosen_node(const void *blob, const char *name);
412
Simon Glassc6782272012-02-03 15:13:53 +0000413/*
Simon Glassa53f4a22012-01-17 08:20:50 +0000414 * Get the name for a compatible ID
415 *
416 * @param id Compatible ID to look for
417 * @return compatible string for that id
418 */
419const char *fdtdec_get_compatible(enum fdt_compat_id id);
Simon Glassd17da652012-02-27 10:52:35 +0000420
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 */
429int 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 */
444int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
445 u32 *array, int count);
446
447/**
Simon Glass96875e72012-04-02 13:18:41 +0000448 * 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 */
463const u32 *fdtdec_locate_array(const void *blob, int node,
464 const char *prop_name, int count);
465
466/**
Simon Glassd17da652012-02-27 10:52:35 +0000467 * 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 */
477int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
Simon Glassed3ee5c2012-02-27 10:52:36 +0000478
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 */
492int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
493 struct fdt_gpio_state *gpio);
494
495/**
Abhilash Kesavan5921f6a2012-10-25 16:31:01 +0000496 * 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 */
508int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
509 struct fdt_gpio_state *gpio, int max_count);
510
511/**
Simon Glassed3ee5c2012-02-27 10:52:36 +0000512 * 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 */
521int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
Anton Staffbed4d892012-04-17 09:01:28 +0000522
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000523/**
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 */
533int fdtdec_get_config_int(const void *blob, const char *prop_name,
534 int default_val);
535
Simon Glass332ab0d2012-10-25 16:30:59 +0000536/**
Gabe Black79289c02012-10-25 16:31:04 +0000537 * 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 */
544int fdtdec_get_config_bool(const void *blob, const char *prop_name);
545
546/**
Simon Glass332ab0d2012-10-25 16:30:59 +0000547 * 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 */
554char *fdtdec_get_config_string(const void *blob, const char *prop_name);
555
Anton Staffbed4d892012-04-17 09:01:28 +0000556/*
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 */
569int 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 */
585const u8 *fdtdec_locate_byte_array(const void *blob, int node,
586 const char *prop_name, int count);
Simon Glassf20c4612012-10-25 16:31:00 +0000587
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 */
602int fdtdec_decode_region(const void *blob, int node,
603 const char *prop_name, void **ptrp, size_t *size);
Simon Glass006e73b2014-02-27 13:26:01 -0700604
605/* A flash map entry, containing an offset and length */
606struct 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 */
620int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
621 struct fmap_entry *entry);
Thierry Reding56f42242014-08-26 17:33:53 +0200622
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 */
633int 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 */
649int 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
Thierry Reding9f85eee2014-08-26 17:33:54 +0200653/**
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 */
662int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf);
663
Simon Glass5bfa78d2012-07-12 05:25:02 +0000664#endif