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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>
Bin Menga62e84d2014-12-31 16:05:11 +080018#include <pci.h>
Simon Glassb5220bc2011-10-24 19:15:32 +000019
20/*
21 * A typedef for a physical address. Note that fdt data is always big
22 * endian even on a litle endian machine.
23 */
York Sun28445aa2015-08-03 12:02:04 -070024typedef phys_addr_t fdt_addr_t;
25typedef phys_size_t fdt_size_t;
Simon Glassb5220bc2011-10-24 19:15:32 +000026#ifdef CONFIG_PHYS_64BIT
Simon Glassb5220bc2011-10-24 19:15:32 +000027#define FDT_ADDR_T_NONE (-1ULL)
28#define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
Simon Glassf20c4612012-10-25 16:31:00 +000029#define fdt_size_to_cpu(reg) be64_to_cpu(reg)
Simon Glassc20ee0e2017-08-29 14:15:50 -060030typedef fdt64_t fdt_val_t;
Simon Glassb5220bc2011-10-24 19:15:32 +000031#else
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 Glassc20ee0e2017-08-29 14:15:50 -060035typedef fdt32_t fdt_val_t;
Simon Glassb5220bc2011-10-24 19:15:32 +000036#endif
37
38/* Information obtained about memory from the FDT */
39struct fdt_memory {
40 fdt_addr_t start;
41 fdt_addr_t end;
42};
43
Simon Glassaf282242015-03-06 13:19:03 -070044#ifdef CONFIG_SPL_BUILD
45#define SPL_BUILD 1
46#else
47#define SPL_BUILD 0
48#endif
49
Thierry Reding56f42242014-08-26 17:33:53 +020050/*
51 * Information about a resource. start is the first address of the resource
52 * and end is the last address (inclusive). The length of the resource will
53 * be equal to: end - start + 1.
54 */
55struct fdt_resource {
56 fdt_addr_t start;
57 fdt_addr_t end;
58};
59
Bin Menga62e84d2014-12-31 16:05:11 +080060enum fdt_pci_space {
61 FDT_PCI_SPACE_CONFIG = 0,
62 FDT_PCI_SPACE_IO = 0x01000000,
63 FDT_PCI_SPACE_MEM32 = 0x02000000,
64 FDT_PCI_SPACE_MEM64 = 0x03000000,
65 FDT_PCI_SPACE_MEM32_PREF = 0x42000000,
66 FDT_PCI_SPACE_MEM64_PREF = 0x43000000,
67};
68
69#define FDT_PCI_ADDR_CELLS 3
70#define FDT_PCI_SIZE_CELLS 2
71#define FDT_PCI_REG_SIZE \
72 ((FDT_PCI_ADDR_CELLS + FDT_PCI_SIZE_CELLS) * sizeof(u32))
73
74/*
75 * The Open Firmware spec defines PCI physical address as follows:
76 *
77 * bits# 31 .... 24 23 .... 16 15 .... 08 07 .... 00
78 *
79 * phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr
80 * phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
81 * phys.lo cell: llllllll llllllll llllllll llllllll
82 *
83 * where:
84 *
85 * n: is 0 if the address is relocatable, 1 otherwise
86 * p: is 1 if addressable region is prefetchable, 0 otherwise
87 * t: is 1 if the address is aliased (for non-relocatable I/O) below 1MB
88 * (for Memory), or below 64KB (for relocatable I/O)
89 * ss: is the space code, denoting the address space
90 * bbbbbbbb: is the 8-bit Bus Number
91 * ddddd: is the 5-bit Device Number
92 * fff: is the 3-bit Function Number
93 * rrrrrrrr: is the 8-bit Register Number
94 * hhhhhhhh: is a 32-bit unsigned number
95 * llllllll: is a 32-bit unsigned number
96 */
97struct fdt_pci_addr {
98 u32 phys_hi;
99 u32 phys_mid;
100 u32 phys_lo;
101};
102
Thierry Reding56f42242014-08-26 17:33:53 +0200103/**
104 * Compute the size of a resource.
105 *
106 * @param res the resource to operate on
107 * @return the size of the resource
108 */
109static inline fdt_size_t fdt_resource_size(const struct fdt_resource *res)
110{
111 return res->end - res->start + 1;
112}
113
Simon Glassb5220bc2011-10-24 19:15:32 +0000114/**
115 * Compat types that we know about and for which we might have drivers.
116 * Each is named COMPAT_<dir>_<filename> where <dir> is the directory
117 * within drivers.
118 */
119enum fdt_compat_id {
120 COMPAT_UNKNOWN,
Allen Martin00a27492012-08-31 08:30:00 +0000121 COMPAT_NVIDIA_TEGRA20_EMC, /* Tegra20 memory controller */
122 COMPAT_NVIDIA_TEGRA20_EMC_TABLE, /* Tegra20 memory timing table */
Jim Lin312693c2012-07-29 20:53:29 +0000123 COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */
Thierry Reding79c7a902014-12-09 22:25:09 -0700124 COMPAT_NVIDIA_TEGRA124_XUSB_PADCTL,
125 /* Tegra124 XUSB pad controller */
Tom Warren7aaa5a62015-03-04 16:36:00 -0700126 COMPAT_NVIDIA_TEGRA210_XUSB_PADCTL,
127 /* Tegra210 XUSB pad controller */
Hatim RVcc9fe332012-12-11 00:52:46 +0000128 COMPAT_SMSC_LAN9215, /* SMSC 10/100 Ethernet LAN9215 */
129 COMPAT_SAMSUNG_EXYNOS5_SROMC, /* Exynos5 SROMC */
Rajeshwari Shindec34253d2012-12-26 20:03:10 +0000130 COMPAT_SAMSUNG_S3C2440_I2C, /* Exynos I2C Controller */
Rajeshwari Shinde72dbff12012-12-26 20:03:16 +0000131 COMPAT_SAMSUNG_EXYNOS5_SOUND, /* Exynos Sound */
132 COMPAT_WOLFSON_WM8994_CODEC, /* Wolfson WM8994 Sound Codec */
Rajeshwari Shinde6abd1622013-01-07 23:35:05 +0000133 COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */
Vivek Gautam108b85b2013-09-14 14:02:48 +0530134 COMPAT_SAMSUNG_EXYNOS5_USB3_PHY,/* Exynos phy controller for usb3.0 */
Akshay Saraswat618766c2013-02-25 01:13:01 +0000135 COMPAT_SAMSUNG_EXYNOS_TMU, /* Exynos TMU */
Piotr Wilczekde461c52014-03-07 14:59:39 +0100136 COMPAT_SAMSUNG_EXYNOS_MIPI_DSI, /* Exynos mipi dsi */
Jaehoon Chung7d3ca0f2014-05-16 13:59:51 +0900137 COMPAT_SAMSUNG_EXYNOS_DWMMC, /* Exynos DWMMC controller */
Piotr Wilczek3577fe82014-03-07 14:59:41 +0100138 COMPAT_SAMSUNG_EXYNOS_MMC, /* Exynos MMC controller */
Rajeshwari Shindecd577e22013-01-08 21:03:38 +0000139 COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */
Simon Glassbb8215f2013-03-11 06:08:08 +0000140 COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */
Rajeshwari Shinde7772bb72013-02-14 19:46:15 +0000141 COMPAT_MAXIM_98095_CODEC, /* MAX98095 Codec */
naveen krishna chatradhiecbd7e12013-04-29 15:58:52 -0700142 COMPAT_SAMSUNG_EXYNOS5_I2C, /* Exynos5 High Speed I2C Controller */
Ajay Kumar45c480c2014-09-05 16:53:33 +0530143 COMPAT_SAMSUNG_EXYNOS_SYSMMU, /* Exynos sysmmu */
Simon Glass77f9b1f2014-11-12 22:42:21 -0700144 COMPAT_INTEL_MICROCODE, /* Intel microcode update */
Thierry Reding6173c452014-12-09 22:25:05 -0700145 COMPAT_AMS_AS3722, /* AMS AS3722 PMIC */
Bin Mengc89ada02015-02-05 23:42:26 +0800146 COMPAT_INTEL_QRK_MRC, /* Intel Quark MRC */
Marek Vasut6ab00db2015-07-25 19:33:56 +0200147 COMPAT_ALTERA_SOCFPGA_DWMAC, /* SoCFPGA Ethernet controller */
Marek Vasut129adf52015-07-25 10:48:14 +0200148 COMPAT_ALTERA_SOCFPGA_DWMMC, /* SoCFPGA DWMMC controller */
Marek Vasutef4b01b2015-12-05 19:28:44 +0100149 COMPAT_ALTERA_SOCFPGA_DWC2USB, /* SoCFPGA DWC2 USB controller */
Andrew Bradfordf3b84a32015-08-07 08:36:35 -0400150 COMPAT_INTEL_BAYTRAIL_FSP, /* Intel Bay Trail FSP */
151 COMPAT_INTEL_BAYTRAIL_FSP_MDP, /* Intel FSP memory-down params */
Bin Meng394e0b62015-12-11 02:55:44 -0800152 COMPAT_INTEL_IVYBRIDGE_FSP, /* Intel Ivy Bridge FSP */
Boris Brezillon4ccae812016-06-15 21:09:23 +0200153 COMPAT_SUNXI_NAND, /* SUNXI NAND controller */
Ley Foon Tane11b5e82017-04-05 17:32:47 +0800154 COMPAT_ALTERA_SOCFPGA_CLK, /* SoCFPGA Clock initialization */
155 COMPAT_ALTERA_SOCFPGA_PINCTRL_SINGLE, /* SoCFPGA pinctrl-single */
156 COMPAT_ALTERA_SOCFPGA_H2F_BRG, /* SoCFPGA hps2fpga bridge */
157 COMPAT_ALTERA_SOCFPGA_LWH2F_BRG, /* SoCFPGA lwhps2fpga bridge */
158 COMPAT_ALTERA_SOCFPGA_F2H_BRG, /* SoCFPGA fpga2hps bridge */
159 COMPAT_ALTERA_SOCFPGA_F2SDR0, /* SoCFPGA fpga2SDRAM0 bridge */
160 COMPAT_ALTERA_SOCFPGA_F2SDR1, /* SoCFPGA fpga2SDRAM1 bridge */
161 COMPAT_ALTERA_SOCFPGA_F2SDR2, /* SoCFPGA fpga2SDRAM2 bridge */
Simon Glassb5220bc2011-10-24 19:15:32 +0000162
163 COMPAT_COUNT,
164};
165
Simon Glass57068a72015-01-05 20:05:26 -0700166#define MAX_PHANDLE_ARGS 16
167struct fdtdec_phandle_args {
168 int node;
169 int args_count;
170 uint32_t args[MAX_PHANDLE_ARGS];
171};
172
173/**
174 * fdtdec_parse_phandle_with_args() - Find a node pointed by phandle in a list
175 *
176 * This function is useful to parse lists of phandles and their arguments.
177 *
178 * Example:
179 *
180 * phandle1: node1 {
181 * #list-cells = <2>;
182 * }
183 *
184 * phandle2: node2 {
185 * #list-cells = <1>;
186 * }
187 *
188 * node3 {
189 * list = <&phandle1 1 2 &phandle2 3>;
190 * }
191 *
192 * To get a device_node of the `node2' node you may call this:
193 * fdtdec_parse_phandle_with_args(blob, node3, "list", "#list-cells", 0, 1,
194 * &args);
195 *
196 * (This function is a modified version of __of_parse_phandle_with_args() from
197 * Linux 3.18)
198 *
199 * @blob: Pointer to device tree
200 * @src_node: Offset of device tree node containing a list
201 * @list_name: property name that contains a list
202 * @cells_name: property name that specifies the phandles' arguments count,
203 * or NULL to use @cells_count
204 * @cells_count: Cell count to use if @cells_name is NULL
205 * @index: index of a phandle to parse out
206 * @out_args: optional pointer to output arguments structure (will be filled)
207 * @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
208 * @list_name does not exist, a phandle was not found, @cells_name
209 * could not be found, the arguments were truncated or there were too
210 * many arguments.
211 *
212 */
213int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
214 const char *list_name,
215 const char *cells_name,
216 int cell_count, int index,
217 struct fdtdec_phandle_args *out_args);
218
Sean Paul202ff752012-10-25 16:31:06 +0000219/**
Simon Glassb5220bc2011-10-24 19:15:32 +0000220 * Find the next numbered alias for a peripheral. This is used to enumerate
221 * all the peripherals of a certain type.
222 *
223 * Do the first call with *upto = 0. Assuming /aliases/<name>0 exists then
224 * this function will return a pointer to the node the alias points to, and
225 * then update *upto to 1. Next time you call this function, the next node
226 * will be returned.
227 *
228 * All nodes returned will match the compatible ID, as it is assumed that
229 * all peripherals use the same driver.
230 *
231 * @param blob FDT blob to use
232 * @param name Root name of alias to search for
233 * @param id Compatible ID to look for
234 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
235 */
236int fdtdec_next_alias(const void *blob, const char *name,
237 enum fdt_compat_id id, int *upto);
238
239/**
Gerald Van Baren7cde3972012-11-12 23:13:54 -0500240 * Find the compatible ID for a given node.
241 *
242 * Generally each node has at least one compatible string attached to it.
243 * This function looks through our list of known compatible strings and
244 * returns the corresponding ID which matches the compatible string.
245 *
246 * @param blob FDT blob to use
247 * @param node Node containing compatible string to find
248 * @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match
249 */
250enum fdt_compat_id fdtdec_lookup(const void *blob, int node);
251
252/**
Simon Glassf88fe2d2012-02-27 10:52:34 +0000253 * Find the next compatible node for a peripheral.
254 *
255 * Do the first call with node = 0. This function will return a pointer to
256 * the next compatible node. Next time you call this function, pass the
257 * value returned, and the next node will be provided.
258 *
259 * @param blob FDT blob to use
260 * @param node Start node for search
261 * @param id Compatible ID to look for (enum fdt_compat_id)
262 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
263 */
264int fdtdec_next_compatible(const void *blob, int node,
265 enum fdt_compat_id id);
266
267/**
Simon Glass3ddecfc2012-04-02 13:18:42 +0000268 * Find the next compatible subnode for a peripheral.
269 *
270 * Do the first call with node set to the parent and depth = 0. This
271 * function will return the offset of the next compatible node. Next time
272 * you call this function, pass the node value returned last time, with
273 * depth unchanged, and the next node will be provided.
274 *
275 * @param blob FDT blob to use
276 * @param node Start node for search
277 * @param id Compatible ID to look for (enum fdt_compat_id)
278 * @param depthp Current depth (set to 0 before first call)
279 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
280 */
281int fdtdec_next_compatible_subnode(const void *blob, int node,
282 enum fdt_compat_id id, int *depthp);
283
Stephen Warren02464e32015-08-06 15:31:02 -0600284/*
285 * Look up an address property in a node and return the parsed address, and
286 * optionally the parsed size.
287 *
288 * This variant assumes a known and fixed number of cells are used to
289 * represent the address and size.
290 *
291 * You probably don't want to use this function directly except to parse
292 * non-standard properties, and never to parse the "reg" property. Instead,
293 * use one of the "auto" variants below, which automatically honor the
294 * #address-cells and #size-cells properties in the parent node.
295 *
296 * @param blob FDT blob
297 * @param node node to examine
298 * @param prop_name name of property to find
299 * @param index which address to retrieve from a list of addresses. Often 0.
300 * @param na the number of cells used to represent an address
301 * @param ns the number of cells used to represent a size
302 * @param sizep a pointer to store the size into. Use NULL if not required
Stephen Warren6e06acb2016-08-05 09:47:51 -0600303 * @param translate Indicates whether to translate the returned value
304 * using the parent node's ranges property.
Stephen Warren02464e32015-08-06 15:31:02 -0600305 * @return address, if found, or FDT_ADDR_T_NONE if not
306 */
307fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node,
308 const char *prop_name, int index, int na, int ns,
Stephen Warren6e06acb2016-08-05 09:47:51 -0600309 fdt_size_t *sizep, bool translate);
Stephen Warren02464e32015-08-06 15:31:02 -0600310
311/*
312 * Look up an address property in a node and return the parsed address, and
313 * optionally the parsed size.
314 *
315 * This variant automatically determines the number of cells used to represent
316 * the address and size by parsing the provided parent node's #address-cells
317 * and #size-cells properties.
318 *
319 * @param blob FDT blob
320 * @param parent parent node of @node
321 * @param node node to examine
322 * @param prop_name name of property to find
323 * @param index which address to retrieve from a list of addresses. Often 0.
324 * @param sizep a pointer to store the size into. Use NULL if not required
Stephen Warren6e06acb2016-08-05 09:47:51 -0600325 * @param translate Indicates whether to translate the returned value
326 * using the parent node's ranges property.
Stephen Warren02464e32015-08-06 15:31:02 -0600327 * @return address, if found, or FDT_ADDR_T_NONE if not
328 */
329fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent,
Stephen Warren6e06acb2016-08-05 09:47:51 -0600330 int node, const char *prop_name, int index, fdt_size_t *sizep,
331 bool translate);
Stephen Warren02464e32015-08-06 15:31:02 -0600332
333/*
334 * Look up an address property in a node and return the parsed address, and
335 * optionally the parsed size.
336 *
337 * This variant automatically determines the number of cells used to represent
338 * the address and size by parsing the parent node's #address-cells
339 * and #size-cells properties. The parent node is automatically found.
340 *
341 * The automatic parent lookup implemented by this function is slow.
342 * Consequently, fdtdec_get_addr_size_auto_parent() should be used where
343 * possible.
344 *
345 * @param blob FDT blob
346 * @param parent parent node of @node
347 * @param node node to examine
348 * @param prop_name name of property to find
349 * @param index which address to retrieve from a list of addresses. Often 0.
350 * @param sizep a pointer to store the size into. Use NULL if not required
Stephen Warren6e06acb2016-08-05 09:47:51 -0600351 * @param translate Indicates whether to translate the returned value
352 * using the parent node's ranges property.
Stephen Warren02464e32015-08-06 15:31:02 -0600353 * @return address, if found, or FDT_ADDR_T_NONE if not
354 */
355fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node,
Stephen Warren6e06acb2016-08-05 09:47:51 -0600356 const char *prop_name, int index, fdt_size_t *sizep,
357 bool translate);
Stephen Warren02464e32015-08-06 15:31:02 -0600358
359/*
360 * Look up an address property in a node and return the parsed address.
361 *
362 * This variant hard-codes the number of cells used to represent the address
363 * and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also
364 * always returns the first address value in the property (index 0).
365 *
366 * Use of this function is not recommended due to the hard-coding of cell
367 * counts. There is no programmatic validation that these hard-coded values
368 * actually match the device tree content in any way at all. This assumption
369 * can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately
370 * set in the U-Boot build and exercising strict control over DT content to
371 * ensure use of matching #address-cells/#size-cells properties. However, this
372 * approach is error-prone; those familiar with DT will not expect the
373 * assumption to exist, and could easily invalidate it. If the assumption is
374 * invalidated, this function will not report the issue, and debugging will
375 * be required. Instead, use fdtdec_get_addr_size_auto_parent().
Simon Glassb5220bc2011-10-24 19:15:32 +0000376 *
377 * @param blob FDT blob
378 * @param node node to examine
379 * @param prop_name name of property to find
380 * @return address, if found, or FDT_ADDR_T_NONE if not
381 */
382fdt_addr_t fdtdec_get_addr(const void *blob, int node,
383 const char *prop_name);
384
Stephen Warren02464e32015-08-06 15:31:02 -0600385/*
386 * Look up an address property in a node and return the parsed address, and
387 * optionally the parsed size.
388 *
389 * This variant hard-codes the number of cells used to represent the address
390 * and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also
391 * always returns the first address value in the property (index 0).
392 *
393 * Use of this function is not recommended due to the hard-coding of cell
394 * counts. There is no programmatic validation that these hard-coded values
395 * actually match the device tree content in any way at all. This assumption
396 * can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately
397 * set in the U-Boot build and exercising strict control over DT content to
398 * ensure use of matching #address-cells/#size-cells properties. However, this
399 * approach is error-prone; those familiar with DT will not expect the
400 * assumption to exist, and could easily invalidate it. If the assumption is
401 * invalidated, this function will not report the issue, and debugging will
402 * be required. Instead, use fdtdec_get_addr_size_auto_parent().
Simon Glass4397a2a2013-03-19 04:58:51 +0000403 *
404 * @param blob FDT blob
405 * @param node node to examine
406 * @param prop_name name of property to find
Stephen Warren02464e32015-08-06 15:31:02 -0600407 * @param sizep a pointer to store the size into. Use NULL if not required
Simon Glass4397a2a2013-03-19 04:58:51 +0000408 * @return address, if found, or FDT_ADDR_T_NONE if not
409 */
410fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
411 const char *prop_name, fdt_size_t *sizep);
412
413/**
Bin Menga62e84d2014-12-31 16:05:11 +0800414 * Look at an address property in a node and return the pci address which
415 * corresponds to the given type in the form of fdt_pci_addr.
416 * The property must hold one fdt_pci_addr with a lengh.
417 *
418 * @param blob FDT blob
419 * @param node node to examine
420 * @param type pci address type (FDT_PCI_SPACE_xxx)
421 * @param prop_name name of property to find
422 * @param addr returns pci address in the form of fdt_pci_addr
Simon Glass106cce92015-03-05 12:25:19 -0700423 * @return 0 if ok, -ENOENT if the property did not exist, -EINVAL if the
424 * format of the property was invalid, -ENXIO if the requested
425 * address type was not found
Bin Menga62e84d2014-12-31 16:05:11 +0800426 */
427int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type,
428 const char *prop_name, struct fdt_pci_addr *addr);
429
430/**
431 * Look at the compatible property of a device node that represents a PCI
432 * device and extract pci vendor id and device id from it.
433 *
434 * @param blob FDT blob
435 * @param node node to examine
436 * @param vendor vendor id of the pci device
437 * @param device device id of the pci device
438 * @return 0 if ok, negative on error
439 */
440int fdtdec_get_pci_vendev(const void *blob, int node,
441 u16 *vendor, u16 *device);
442
443/**
444 * Look at the pci address of a device node that represents a PCI device
Bin Menga62e84d2014-12-31 16:05:11 +0800445 * and return base address of the pci device's registers.
446 *
Simon Glassfcc0a872015-11-29 13:17:54 -0700447 * @param dev device to examine
Bin Menga62e84d2014-12-31 16:05:11 +0800448 * @param addr pci address in the form of fdt_pci_addr
449 * @param bar returns base address of the pci device's registers
450 * @return 0 if ok, negative on error
451 */
Simon Glassfcc0a872015-11-29 13:17:54 -0700452int fdtdec_get_pci_bar32(struct udevice *dev, struct fdt_pci_addr *addr,
453 u32 *bar);
Bin Menga62e84d2014-12-31 16:05:11 +0800454
455/**
Simon Glassb5220bc2011-10-24 19:15:32 +0000456 * Look up a 32-bit integer property in a node and return it. The property
457 * must have at least 4 bytes of data. The value of the first cell is
458 * returned.
459 *
460 * @param blob FDT blob
461 * @param node node to examine
462 * @param prop_name name of property to find
463 * @param default_val default value to return if the property is not found
464 * @return integer value, if found, or default_val if not
465 */
466s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
467 s32 default_val);
468
469/**
Chin Liang Seebfa3e552015-10-17 08:30:32 -0500470 * Unsigned version of fdtdec_get_int. The property must have at least
471 * 4 bytes of data. The value of the first cell is returned.
472 *
473 * @param blob FDT blob
474 * @param node node to examine
475 * @param prop_name name of property to find
476 * @param default_val default value to return if the property is not found
477 * @return unsigned integer value, if found, or default_val if not
478 */
479unsigned int fdtdec_get_uint(const void *blob, int node, const char *prop_name,
480 unsigned int default_val);
481
482/**
Simon Glass5f7bfdd2015-03-05 12:25:14 -0700483 * Get a variable-sized number from a property
484 *
485 * This reads a number from one or more cells.
486 *
487 * @param ptr Pointer to property
488 * @param cells Number of cells containing the number
489 * @return the value in the cells
490 */
491u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells);
492
493/**
Che-Liang Chiouaadef0a2012-10-25 16:31:05 +0000494 * Look up a 64-bit integer property in a node and return it. The property
495 * must have at least 8 bytes of data (2 cells). The first two cells are
496 * concatenated to form a 8 bytes value, where the first cell is top half and
497 * the second cell is bottom half.
498 *
499 * @param blob FDT blob
500 * @param node node to examine
501 * @param prop_name name of property to find
502 * @param default_val default value to return if the property is not found
503 * @return integer value, if found, or default_val if not
504 */
505uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
506 uint64_t default_val);
507
508/**
Simon Glassb5220bc2011-10-24 19:15:32 +0000509 * Checks whether a node is enabled.
510 * This looks for a 'status' property. If this exists, then returns 1 if
511 * the status is 'ok' and 0 otherwise. If there is no status property,
Simon Glassf88fe2d2012-02-27 10:52:34 +0000512 * it returns 1 on the assumption that anything mentioned should be enabled
513 * by default.
Simon Glassb5220bc2011-10-24 19:15:32 +0000514 *
515 * @param blob FDT blob
516 * @param node node to examine
Simon Glassf88fe2d2012-02-27 10:52:34 +0000517 * @return integer value 0 (not enabled) or 1 (enabled)
Simon Glassb5220bc2011-10-24 19:15:32 +0000518 */
Simon Glassf88fe2d2012-02-27 10:52:34 +0000519int fdtdec_get_is_enabled(const void *blob, int node);
Simon Glassb5220bc2011-10-24 19:15:32 +0000520
521/**
Simon Glass9a263e52012-03-28 10:08:24 +0000522 * Make sure we have a valid fdt available to control U-Boot.
523 *
524 * If not, a message is printed to the console if the console is ready.
525 *
526 * @return 0 if all ok, -1 if not
527 */
528int fdtdec_prepare_fdt(void);
529
530/**
531 * Checks that we have a valid fdt available to control U-Boot.
532
533 * However, if not then for the moment nothing is done, since this function
534 * is called too early to panic().
535 *
536 * @returns 0
Simon Glassb5220bc2011-10-24 19:15:32 +0000537 */
538int fdtdec_check_fdt(void);
Simon Glassa53f4a22012-01-17 08:20:50 +0000539
540/**
541 * Find the nodes for a peripheral and return a list of them in the correct
542 * order. This is used to enumerate all the peripherals of a certain type.
543 *
544 * To use this, optionally set up a /aliases node with alias properties for
545 * a peripheral. For example, for usb you could have:
546 *
547 * aliases {
548 * usb0 = "/ehci@c5008000";
549 * usb1 = "/ehci@c5000000";
550 * };
551 *
552 * Pass "usb" as the name to this function and will return a list of two
553 * nodes offsets: /ehci@c5008000 and ehci@c5000000.
554 *
555 * All nodes returned will match the compatible ID, as it is assumed that
556 * all peripherals use the same driver.
557 *
558 * If no alias node is found, then the node list will be returned in the
559 * order found in the fdt. If the aliases mention a node which doesn't
560 * exist, then this will be ignored. If nodes are found with no aliases,
561 * they will be added in any order.
562 *
563 * If there is a gap in the aliases, then this function return a 0 node at
564 * that position. The return value will also count these gaps.
565 *
566 * This function checks node properties and will not return nodes which are
567 * marked disabled (status = "disabled").
568 *
569 * @param blob FDT blob to use
570 * @param name Root name of alias to search for
571 * @param id Compatible ID to look for
572 * @param node_list Place to put list of found nodes
573 * @param maxcount Maximum number of nodes to find
Robert P. J. Day1cc0a9f2016-05-04 04:47:31 -0400574 * @return number of nodes found on success, FDT_ERR_... on error
Simon Glassa53f4a22012-01-17 08:20:50 +0000575 */
576int fdtdec_find_aliases_for_id(const void *blob, const char *name,
577 enum fdt_compat_id id, int *node_list, int maxcount);
578
579/*
Simon Glassc6782272012-02-03 15:13:53 +0000580 * This function is similar to fdtdec_find_aliases_for_id() except that it
581 * adds to the node_list that is passed in. Any 0 elements are considered
582 * available for allocation - others are considered already used and are
583 * skipped.
584 *
585 * You can use this by calling fdtdec_find_aliases_for_id() with an
586 * uninitialised array, then setting the elements that are returned to -1,
587 * say, then calling this function, perhaps with a different compat id.
588 * Any elements you get back that are >0 are new nodes added by the call
589 * to this function.
590 *
591 * Note that if you have some nodes with aliases and some without, you are
592 * sailing close to the wind. The call to fdtdec_find_aliases_for_id() with
593 * one compat_id may fill in positions for which you have aliases defined
594 * for another compat_id. When you later call *this* function with the second
595 * compat_id, the alias positions may already be used. A debug warning may
596 * be generated in this case, but it is safest to define aliases for all
597 * nodes when you care about the ordering.
598 */
599int fdtdec_add_aliases_for_id(const void *blob, const char *name,
600 enum fdt_compat_id id, int *node_list, int maxcount);
601
Simon Glass5c33c9f2014-07-23 06:55:09 -0600602/**
603 * Get the alias sequence number of a node
604 *
605 * This works out whether a node is pointed to by an alias, and if so, the
606 * sequence number of that alias. Aliases are of the form <base><num> where
607 * <num> is the sequence number. For example spi2 would be sequence number
608 * 2.
609 *
610 * @param blob Device tree blob (if NULL, then error is returned)
611 * @param base Base name for alias (before the underscore)
612 * @param node Node to look up
613 * @param seqp This is set to the sequence number if one is found,
614 * but otherwise the value is left alone
615 * @return 0 if a sequence was found, -ve if not
616 */
617int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
618 int *seqp);
619
Simon Glass3234aa42014-07-23 06:55:16 -0600620/**
Simon Glass3bc37a52015-10-17 19:41:14 -0600621 * Get a property from the /chosen node
622 *
623 * @param blob Device tree blob (if NULL, then NULL is returned)
624 * @param name Property name to look up
625 * @return Value of property, or NULL if it does not exist
626 */
627const char *fdtdec_get_chosen_prop(const void *blob, const char *name);
628
629/**
630 * Get the offset of the given /chosen node
Simon Glassaac07d42014-09-04 16:27:24 -0600631 *
632 * This looks up a property in /chosen containing the path to another node,
633 * then finds the offset of that node.
634 *
635 * @param blob Device tree blob (if NULL, then error is returned)
636 * @param name Property name, e.g. "stdout-path"
637 * @return Node offset referred to by that chosen node, or -ve FDT_ERR_...
638 */
639int fdtdec_get_chosen_node(const void *blob, const char *name);
640
Simon Glassc6782272012-02-03 15:13:53 +0000641/*
Simon Glassa53f4a22012-01-17 08:20:50 +0000642 * Get the name for a compatible ID
643 *
644 * @param id Compatible ID to look for
645 * @return compatible string for that id
646 */
647const char *fdtdec_get_compatible(enum fdt_compat_id id);
Simon Glassd17da652012-02-27 10:52:35 +0000648
649/* Look up a phandle and follow it to its node. Then return the offset
650 * of that node.
651 *
652 * @param blob FDT blob
653 * @param node node to examine
654 * @param prop_name name of property to find
655 * @return node offset if found, -ve error code on error
656 */
657int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);
658
659/**
660 * Look up a property in a node and return its contents in an integer
661 * array of given length. The property must have at least enough data for
662 * the array (4*count bytes). It may have more, but this will be ignored.
663 *
664 * @param blob FDT blob
665 * @param node node to examine
666 * @param prop_name name of property to find
667 * @param array array to fill with data
668 * @param count number of array elements
669 * @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found,
670 * or -FDT_ERR_BADLAYOUT if not enough data
671 */
672int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
673 u32 *array, int count);
674
675/**
Simon Glassa9f04d42014-11-10 18:00:19 -0700676 * Look up a property in a node and return its contents in an integer
677 * array of given length. The property must exist but may have less data that
678 * expected (4*count bytes). It may have more, but this will be ignored.
679 *
680 * @param blob FDT blob
681 * @param node node to examine
682 * @param prop_name name of property to find
683 * @param array array to fill with data
684 * @param count number of array elements
685 * @return number of array elements if ok, or -FDT_ERR_NOTFOUND if the
686 * property is not found
687 */
688int fdtdec_get_int_array_count(const void *blob, int node,
689 const char *prop_name, u32 *array, int count);
690
691/**
Simon Glass96875e72012-04-02 13:18:41 +0000692 * Look up a property in a node and return a pointer to its contents as a
693 * unsigned int array of given length. The property must have at least enough
694 * data for the array ('count' cells). It may have more, but this will be
695 * ignored. The data is not copied.
696 *
697 * Note that you must access elements of the array with fdt32_to_cpu(),
698 * since the elements will be big endian even on a little endian machine.
699 *
700 * @param blob FDT blob
701 * @param node node to examine
702 * @param prop_name name of property to find
703 * @param count number of array elements
704 * @return pointer to array if found, or NULL if the property is not
705 * found or there is not enough data
706 */
707const u32 *fdtdec_locate_array(const void *blob, int node,
708 const char *prop_name, int count);
709
710/**
Simon Glassd17da652012-02-27 10:52:35 +0000711 * Look up a boolean property in a node and return it.
712 *
713 * A boolean properly is true if present in the device tree and false if not
714 * present, regardless of its value.
715 *
716 * @param blob FDT blob
717 * @param node node to examine
718 * @param prop_name name of property to find
719 * @return 1 if the properly is present; 0 if it isn't present
720 */
721int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
Simon Glassed3ee5c2012-02-27 10:52:36 +0000722
Peng Fan1889a7e2016-02-01 13:31:15 +0800723/*
724 * Count child nodes of one parent node.
725 *
726 * @param blob FDT blob
727 * @param node parent node
728 * @return number of child node; 0 if there is not child node
729 */
730int fdtdec_get_child_count(const void *blob, int node);
731
Simon Glassed3ee5c2012-02-27 10:52:36 +0000732/**
Abhilash Kesavan09258f12012-10-25 16:30:58 +0000733 * Look in the FDT for a config item with the given name and return its value
734 * as a 32-bit integer. The property must have at least 4 bytes of data. The
735 * value of the first cell is returned.
736 *
737 * @param blob FDT blob to use
738 * @param prop_name Node property name
739 * @param default_val default value to return if the property is not found
740 * @return integer value, if found, or default_val if not
741 */
742int fdtdec_get_config_int(const void *blob, const char *prop_name,
743 int default_val);
744
Simon Glass332ab0d2012-10-25 16:30:59 +0000745/**
Gabe Black79289c02012-10-25 16:31:04 +0000746 * Look in the FDT for a config item with the given name
747 * and return whether it exists.
748 *
749 * @param blob FDT blob
750 * @param prop_name property name to look up
751 * @return 1, if it exists, or 0 if not
752 */
753int fdtdec_get_config_bool(const void *blob, const char *prop_name);
754
755/**
Simon Glass332ab0d2012-10-25 16:30:59 +0000756 * Look in the FDT for a config item with the given name and return its value
757 * as a string.
758 *
759 * @param blob FDT blob
760 * @param prop_name property name to look up
761 * @returns property string, NULL on error.
762 */
763char *fdtdec_get_config_string(const void *blob, const char *prop_name);
764
Anton Staffbed4d892012-04-17 09:01:28 +0000765/*
766 * Look up a property in a node and return its contents in a byte
767 * array of given length. The property must have at least enough data for
768 * the array (count bytes). It may have more, but this will be ignored.
769 *
770 * @param blob FDT blob
771 * @param node node to examine
772 * @param prop_name name of property to find
773 * @param array array to fill with data
774 * @param count number of array elements
775 * @return 0 if ok, or -FDT_ERR_MISSING if the property is not found,
776 * or -FDT_ERR_BADLAYOUT if not enough data
777 */
778int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
779 u8 *array, int count);
780
781/**
782 * Look up a property in a node and return a pointer to its contents as a
783 * byte array of given length. The property must have at least enough data
784 * for the array (count bytes). It may have more, but this will be ignored.
785 * The data is not copied.
786 *
787 * @param blob FDT blob
788 * @param node node to examine
789 * @param prop_name name of property to find
790 * @param count number of array elements
791 * @return pointer to byte array if found, or NULL if the property is not
792 * found or there is not enough data
793 */
794const u8 *fdtdec_locate_byte_array(const void *blob, int node,
795 const char *prop_name, int count);
Simon Glassf20c4612012-10-25 16:31:00 +0000796
797/**
798 * Look up a property in a node which contains a memory region address and
799 * size. Then return a pointer to this address.
800 *
801 * The property must hold one address with a length. This is only tested on
802 * 32-bit machines.
803 *
804 * @param blob FDT blob
805 * @param node node to examine
806 * @param prop_name name of property to find
Simon Glass76489832014-10-23 18:58:51 -0600807 * @param basep Returns base address of region
808 * @param size Returns size of region
809 * @return 0 if ok, -1 on error (property not found)
Simon Glassf20c4612012-10-25 16:31:00 +0000810 */
Simon Glass76489832014-10-23 18:58:51 -0600811int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
812 fdt_addr_t *basep, fdt_size_t *sizep);
Simon Glass006e73b2014-02-27 13:26:01 -0700813
Thierry Reding56f42242014-08-26 17:33:53 +0200814/**
815 * Obtain an indexed resource from a device property.
816 *
817 * @param fdt FDT blob
818 * @param node node to examine
819 * @param property name of the property to parse
820 * @param index index of the resource to retrieve
821 * @param res returns the resource
822 * @return 0 if ok, negative on error
823 */
824int fdt_get_resource(const void *fdt, int node, const char *property,
825 unsigned int index, struct fdt_resource *res);
826
827/**
828 * Obtain a named resource from a device property.
829 *
830 * Look up the index of the name in a list of strings and return the resource
831 * at that index.
832 *
833 * @param fdt FDT blob
834 * @param node node to examine
835 * @param property name of the property to parse
836 * @param prop_names name of the property containing the list of names
837 * @param name the name of the entry to look up
838 * @param res returns the resource
839 */
840int fdt_get_named_resource(const void *fdt, int node, const char *property,
841 const char *prop_names, const char *name,
842 struct fdt_resource *res);
843
Thierry Reding9f85eee2014-08-26 17:33:54 +0200844/**
Simon Glass26403872014-10-23 18:58:56 -0600845 * Decode a named region within a memory bank of a given type.
846 *
847 * This function handles selection of a memory region. The region is
848 * specified as an offset/size within a particular type of memory.
849 *
850 * The properties used are:
851 *
852 * <mem_type>-memory<suffix> for the name of the memory bank
853 * <mem_type>-offset<suffix> for the offset in that bank
854 *
855 * The property value must have an offset and a size. The function checks
856 * that the region is entirely within the memory bank.5
857 *
858 * @param blob FDT blob
859 * @param node Node containing the properties (-1 for /config)
860 * @param mem_type Type of memory to use, which is a name, such as
861 * "u-boot" or "kernel".
862 * @param suffix String to append to the memory/offset
863 * property names
864 * @param basep Returns base of region
865 * @param sizep Returns size of region
866 * @return 0 if OK, -ive on error
867 */
868int fdtdec_decode_memory_region(const void *blob, int node,
869 const char *mem_type, const char *suffix,
870 fdt_addr_t *basep, fdt_size_t *sizep);
Simon Glassb45122f2015-02-27 22:06:34 -0700871
Simon Glass12e67112015-04-14 21:03:21 -0600872/* Display timings from linux include/video/display_timing.h */
873enum display_flags {
874 DISPLAY_FLAGS_HSYNC_LOW = 1 << 0,
875 DISPLAY_FLAGS_HSYNC_HIGH = 1 << 1,
876 DISPLAY_FLAGS_VSYNC_LOW = 1 << 2,
877 DISPLAY_FLAGS_VSYNC_HIGH = 1 << 3,
878
879 /* data enable flag */
880 DISPLAY_FLAGS_DE_LOW = 1 << 4,
881 DISPLAY_FLAGS_DE_HIGH = 1 << 5,
882 /* drive data on pos. edge */
883 DISPLAY_FLAGS_PIXDATA_POSEDGE = 1 << 6,
884 /* drive data on neg. edge */
885 DISPLAY_FLAGS_PIXDATA_NEGEDGE = 1 << 7,
886 DISPLAY_FLAGS_INTERLACED = 1 << 8,
887 DISPLAY_FLAGS_DOUBLESCAN = 1 << 9,
888 DISPLAY_FLAGS_DOUBLECLK = 1 << 10,
889};
890
891/*
892 * A single signal can be specified via a range of minimal and maximal values
893 * with a typical value, that lies somewhere inbetween.
894 */
895struct timing_entry {
896 u32 min;
897 u32 typ;
898 u32 max;
899};
900
901/*
902 * Single "mode" entry. This describes one set of signal timings a display can
903 * have in one setting. This struct can later be converted to struct videomode
904 * (see include/video/videomode.h). As each timing_entry can be defined as a
905 * range, one struct display_timing may become multiple struct videomodes.
906 *
907 * Example: hsync active high, vsync active low
908 *
909 * Active Video
910 * Video ______________________XXXXXXXXXXXXXXXXXXXXXX_____________________
911 * |<- sync ->|<- back ->|<----- active ----->|<- front ->|<- sync..
912 * | | porch | | porch |
913 *
914 * HSync _|¯¯¯¯¯¯¯¯¯¯|___________________________________________|¯¯¯¯¯¯¯¯¯
915 *
916 * VSync ¯|__________|¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|_________
917 */
918struct display_timing {
919 struct timing_entry pixelclock;
920
921 struct timing_entry hactive; /* hor. active video */
922 struct timing_entry hfront_porch; /* hor. front porch */
923 struct timing_entry hback_porch; /* hor. back porch */
924 struct timing_entry hsync_len; /* hor. sync len */
925
926 struct timing_entry vactive; /* ver. active video */
927 struct timing_entry vfront_porch; /* ver. front porch */
928 struct timing_entry vback_porch; /* ver. back porch */
929 struct timing_entry vsync_len; /* ver. sync len */
930
931 enum display_flags flags; /* display flags */
Jernej Skrabec43c6bdd2017-04-29 14:43:36 +0200932 bool hdmi_monitor; /* is hdmi monitor? */
Simon Glass12e67112015-04-14 21:03:21 -0600933};
934
935/**
936 * fdtdec_decode_display_timing() - decode display timings
937 *
938 * Decode display timings from the supplied 'display-timings' node.
939 * See doc/device-tree-bindings/video/display-timing.txt for binding
940 * information.
941 *
942 * @param blob FDT blob
943 * @param node 'display-timing' node containing the timing subnodes
944 * @param index Index number to read (0=first timing subnode)
945 * @param config Place to put timings
946 * @return 0 if OK, -FDT_ERR_NOTFOUND if not found
947 */
948int fdtdec_decode_display_timing(const void *blob, int node, int index,
949 struct display_timing *config);
Nathan Rossi623f6012016-12-19 00:03:34 +1000950
951/**
952 * fdtdec_setup_memory_size() - decode and setup gd->ram_size
953 *
954 * Decode the /memory 'reg' property to determine the size of the first memory
955 * bank, populate the global data with the size of the first bank of memory.
956 *
957 * This function should be called from a boards dram_init(). This helper
958 * function allows for boards to query the device tree for DRAM size instead of
959 * hard coding the value in the case where the memory size cannot be detected
960 * automatically.
961 *
962 * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or
963 * invalid
964 */
965int fdtdec_setup_memory_size(void);
966
967/**
968 * fdtdec_setup_memory_banksize() - decode and populate gd->bd->bi_dram
969 *
970 * Decode the /memory 'reg' property to determine the address and size of the
971 * memory banks. Use this data to populate the global data board info with the
972 * phys address and size of memory banks.
973 *
974 * This function should be called from a boards dram_init_banksize(). This
975 * helper function allows for boards to query the device tree for memory bank
976 * information instead of hard coding the information in cases where it cannot
977 * be detected automatically.
978 *
979 * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or
980 * invalid
981 */
982int fdtdec_setup_memory_banksize(void);
983
Simon Glassb45122f2015-02-27 22:06:34 -0700984/**
985 * Set up the device tree ready for use
986 */
Simon Glass08793612015-02-27 22:06:35 -0700987int fdtdec_setup(void);
Simon Glassb45122f2015-02-27 22:06:34 -0700988
Alex Deymo82f766d2017-04-02 01:25:20 -0700989/**
990 * Board-specific FDT initialization. Returns the address to a device tree blob.
991 * Called when CONFIG_OF_BOARD is defined.
992 */
993void *board_fdt_blob_setup(void);
994
Simon Glass5bfa78d2012-07-12 05:25:02 +0000995#endif