| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Copyright (c) 2011 The Chromium OS Authors. |
| */ |
| |
| #ifndef __fdtdec_h |
| #define __fdtdec_h |
| |
| /* |
| * This file contains convenience functions for decoding useful and |
| * enlightening information from FDTs. It is intended to be used by device |
| * drivers and board-specific code within U-Boot. It aims to reduce the |
| * amount of FDT munging required within U-Boot itself, so that driver code |
| * changes to support FDT are minimized. |
| */ |
| |
| #include <linux/libfdt.h> |
| #include <pci.h> |
| |
| /* |
| * A typedef for a physical address. Note that fdt data is always big |
| * endian even on a litle endian machine. |
| */ |
| typedef phys_addr_t fdt_addr_t; |
| typedef phys_size_t fdt_size_t; |
| #ifdef CONFIG_PHYS_64BIT |
| #define FDT_ADDR_T_NONE (-1U) |
| #define fdt_addr_to_cpu(reg) be64_to_cpu(reg) |
| #define fdt_size_to_cpu(reg) be64_to_cpu(reg) |
| typedef fdt64_t fdt_val_t; |
| #else |
| #define FDT_ADDR_T_NONE (-1U) |
| #define fdt_addr_to_cpu(reg) be32_to_cpu(reg) |
| #define fdt_size_to_cpu(reg) be32_to_cpu(reg) |
| typedef fdt32_t fdt_val_t; |
| #endif |
| |
| /* Information obtained about memory from the FDT */ |
| struct fdt_memory { |
| fdt_addr_t start; |
| fdt_addr_t end; |
| }; |
| |
| #ifdef CONFIG_SPL_BUILD |
| #define SPL_BUILD 1 |
| #else |
| #define SPL_BUILD 0 |
| #endif |
| |
| /* |
| * Information about a resource. start is the first address of the resource |
| * and end is the last address (inclusive). The length of the resource will |
| * be equal to: end - start + 1. |
| */ |
| struct fdt_resource { |
| fdt_addr_t start; |
| fdt_addr_t end; |
| }; |
| |
| enum fdt_pci_space { |
| FDT_PCI_SPACE_CONFIG = 0, |
| FDT_PCI_SPACE_IO = 0x01000000, |
| FDT_PCI_SPACE_MEM32 = 0x02000000, |
| FDT_PCI_SPACE_MEM64 = 0x03000000, |
| FDT_PCI_SPACE_MEM32_PREF = 0x42000000, |
| FDT_PCI_SPACE_MEM64_PREF = 0x43000000, |
| }; |
| |
| #define FDT_PCI_ADDR_CELLS 3 |
| #define FDT_PCI_SIZE_CELLS 2 |
| #define FDT_PCI_REG_SIZE \ |
| ((FDT_PCI_ADDR_CELLS + FDT_PCI_SIZE_CELLS) * sizeof(u32)) |
| |
| /* |
| * The Open Firmware spec defines PCI physical address as follows: |
| * |
| * bits# 31 .... 24 23 .... 16 15 .... 08 07 .... 00 |
| * |
| * phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr |
| * phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh |
| * phys.lo cell: llllllll llllllll llllllll llllllll |
| * |
| * where: |
| * |
| * n: is 0 if the address is relocatable, 1 otherwise |
| * p: is 1 if addressable region is prefetchable, 0 otherwise |
| * t: is 1 if the address is aliased (for non-relocatable I/O) below 1MB |
| * (for Memory), or below 64KB (for relocatable I/O) |
| * ss: is the space code, denoting the address space |
| * bbbbbbbb: is the 8-bit Bus Number |
| * ddddd: is the 5-bit Device Number |
| * fff: is the 3-bit Function Number |
| * rrrrrrrr: is the 8-bit Register Number |
| * hhhhhhhh: is a 32-bit unsigned number |
| * llllllll: is a 32-bit unsigned number |
| */ |
| struct fdt_pci_addr { |
| u32 phys_hi; |
| u32 phys_mid; |
| u32 phys_lo; |
| }; |
| |
| /** |
| * Compute the size of a resource. |
| * |
| * @param res the resource to operate on |
| * @return the size of the resource |
| */ |
| static inline fdt_size_t fdt_resource_size(const struct fdt_resource *res) |
| { |
| return res->end - res->start + 1; |
| } |
| |
| /** |
| * Compat types that we know about and for which we might have drivers. |
| * Each is named COMPAT_<dir>_<filename> where <dir> is the directory |
| * within drivers. |
| */ |
| enum fdt_compat_id { |
| COMPAT_UNKNOWN, |
| COMPAT_NVIDIA_TEGRA20_EMC, /* Tegra20 memory controller */ |
| COMPAT_NVIDIA_TEGRA20_EMC_TABLE, /* Tegra20 memory timing table */ |
| COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */ |
| COMPAT_NVIDIA_TEGRA124_XUSB_PADCTL, |
| /* Tegra124 XUSB pad controller */ |
| COMPAT_NVIDIA_TEGRA210_XUSB_PADCTL, |
| /* Tegra210 XUSB pad controller */ |
| COMPAT_SMSC_LAN9215, /* SMSC 10/100 Ethernet LAN9215 */ |
| COMPAT_SAMSUNG_EXYNOS5_SROMC, /* Exynos5 SROMC */ |
| COMPAT_SAMSUNG_S3C2440_I2C, /* Exynos I2C Controller */ |
| COMPAT_SAMSUNG_EXYNOS5_SOUND, /* Exynos Sound */ |
| COMPAT_WOLFSON_WM8994_CODEC, /* Wolfson WM8994 Sound Codec */ |
| COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */ |
| COMPAT_SAMSUNG_EXYNOS5_USB3_PHY,/* Exynos phy controller for usb3.0 */ |
| COMPAT_SAMSUNG_EXYNOS_TMU, /* Exynos TMU */ |
| COMPAT_SAMSUNG_EXYNOS_MIPI_DSI, /* Exynos mipi dsi */ |
| COMPAT_SAMSUNG_EXYNOS_DWMMC, /* Exynos DWMMC controller */ |
| COMPAT_SAMSUNG_EXYNOS_MMC, /* Exynos MMC controller */ |
| COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */ |
| COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */ |
| COMPAT_MAXIM_98095_CODEC, /* MAX98095 Codec */ |
| COMPAT_SAMSUNG_EXYNOS5_I2C, /* Exynos5 High Speed I2C Controller */ |
| COMPAT_SAMSUNG_EXYNOS_SYSMMU, /* Exynos sysmmu */ |
| COMPAT_INTEL_MICROCODE, /* Intel microcode update */ |
| COMPAT_AMS_AS3722, /* AMS AS3722 PMIC */ |
| COMPAT_INTEL_QRK_MRC, /* Intel Quark MRC */ |
| COMPAT_ALTERA_SOCFPGA_DWMAC, /* SoCFPGA Ethernet controller */ |
| COMPAT_ALTERA_SOCFPGA_DWMMC, /* SoCFPGA DWMMC controller */ |
| COMPAT_ALTERA_SOCFPGA_DWC2USB, /* SoCFPGA DWC2 USB controller */ |
| COMPAT_INTEL_BAYTRAIL_FSP, /* Intel Bay Trail FSP */ |
| COMPAT_INTEL_BAYTRAIL_FSP_MDP, /* Intel FSP memory-down params */ |
| COMPAT_INTEL_IVYBRIDGE_FSP, /* Intel Ivy Bridge FSP */ |
| COMPAT_SUNXI_NAND, /* SUNXI NAND controller */ |
| COMPAT_ALTERA_SOCFPGA_CLK, /* SoCFPGA Clock initialization */ |
| COMPAT_ALTERA_SOCFPGA_PINCTRL_SINGLE, /* SoCFPGA pinctrl-single */ |
| COMPAT_ALTERA_SOCFPGA_H2F_BRG, /* SoCFPGA hps2fpga bridge */ |
| COMPAT_ALTERA_SOCFPGA_LWH2F_BRG, /* SoCFPGA lwhps2fpga bridge */ |
| COMPAT_ALTERA_SOCFPGA_F2H_BRG, /* SoCFPGA fpga2hps bridge */ |
| COMPAT_ALTERA_SOCFPGA_F2SDR0, /* SoCFPGA fpga2SDRAM0 bridge */ |
| COMPAT_ALTERA_SOCFPGA_F2SDR1, /* SoCFPGA fpga2SDRAM1 bridge */ |
| COMPAT_ALTERA_SOCFPGA_F2SDR2, /* SoCFPGA fpga2SDRAM2 bridge */ |
| COMPAT_ALTERA_SOCFPGA_FPGA0, /* SOCFPGA FPGA manager */ |
| COMPAT_ALTERA_SOCFPGA_NOC, /* SOCFPGA Arria 10 NOC */ |
| COMPAT_MESON_NAND, /*AMLOGIC Meson Nand Flash Controller*/ |
| COMPAT_COUNT, |
| }; |
| |
| #define MAX_PHANDLE_ARGS 16 |
| struct fdtdec_phandle_args { |
| int node; |
| int args_count; |
| uint32_t args[MAX_PHANDLE_ARGS]; |
| }; |
| |
| /** |
| * fdtdec_parse_phandle_with_args() - Find a node pointed by phandle in a list |
| * |
| * This function is useful to parse lists of phandles and their arguments. |
| * |
| * Example: |
| * |
| * phandle1: node1 { |
| * #list-cells = <2>; |
| * } |
| * |
| * phandle2: node2 { |
| * #list-cells = <1>; |
| * } |
| * |
| * node3 { |
| * list = <&phandle1 1 2 &phandle2 3>; |
| * } |
| * |
| * To get a device_node of the `node2' node you may call this: |
| * fdtdec_parse_phandle_with_args(blob, node3, "list", "#list-cells", 0, 1, |
| * &args); |
| * |
| * (This function is a modified version of __of_parse_phandle_with_args() from |
| * Linux 3.18) |
| * |
| * @blob: Pointer to device tree |
| * @src_node: Offset of device tree node containing a list |
| * @list_name: property name that contains a list |
| * @cells_name: property name that specifies the phandles' arguments count, |
| * or NULL to use @cells_count |
| * @cells_count: Cell count to use if @cells_name is NULL |
| * @index: index of a phandle to parse out |
| * @out_args: optional pointer to output arguments structure (will be filled) |
| * @return 0 on success (with @out_args filled out if not NULL), -ENOENT if |
| * @list_name does not exist, a phandle was not found, @cells_name |
| * could not be found, the arguments were truncated or there were too |
| * many arguments. |
| * |
| */ |
| int fdtdec_parse_phandle_with_args(const void *blob, int src_node, |
| const char *list_name, |
| const char *cells_name, |
| int cell_count, int index, |
| struct fdtdec_phandle_args *out_args); |
| |
| /** |
| * Find the next numbered alias for a peripheral. This is used to enumerate |
| * all the peripherals of a certain type. |
| * |
| * Do the first call with *upto = 0. Assuming /aliases/<name>0 exists then |
| * this function will return a pointer to the node the alias points to, and |
| * then update *upto to 1. Next time you call this function, the next node |
| * will be returned. |
| * |
| * All nodes returned will match the compatible ID, as it is assumed that |
| * all peripherals use the same driver. |
| * |
| * @param blob FDT blob to use |
| * @param name Root name of alias to search for |
| * @param id Compatible ID to look for |
| * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more |
| */ |
| int fdtdec_next_alias(const void *blob, const char *name, |
| enum fdt_compat_id id, int *upto); |
| |
| /** |
| * Find the compatible ID for a given node. |
| * |
| * Generally each node has at least one compatible string attached to it. |
| * This function looks through our list of known compatible strings and |
| * returns the corresponding ID which matches the compatible string. |
| * |
| * @param blob FDT blob to use |
| * @param node Node containing compatible string to find |
| * @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match |
| */ |
| enum fdt_compat_id fdtdec_lookup(const void *blob, int node); |
| |
| /** |
| * Find the next compatible node for a peripheral. |
| * |
| * Do the first call with node = 0. This function will return a pointer to |
| * the next compatible node. Next time you call this function, pass the |
| * value returned, and the next node will be provided. |
| * |
| * @param blob FDT blob to use |
| * @param node Start node for search |
| * @param id Compatible ID to look for (enum fdt_compat_id) |
| * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more |
| */ |
| int fdtdec_next_compatible(const void *blob, int node, |
| enum fdt_compat_id id); |
| |
| /** |
| * Find the next compatible subnode for a peripheral. |
| * |
| * Do the first call with node set to the parent and depth = 0. This |
| * function will return the offset of the next compatible node. Next time |
| * you call this function, pass the node value returned last time, with |
| * depth unchanged, and the next node will be provided. |
| * |
| * @param blob FDT blob to use |
| * @param node Start node for search |
| * @param id Compatible ID to look for (enum fdt_compat_id) |
| * @param depthp Current depth (set to 0 before first call) |
| * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more |
| */ |
| int fdtdec_next_compatible_subnode(const void *blob, int node, |
| enum fdt_compat_id id, int *depthp); |
| |
| /* |
| * Look up an address property in a node and return the parsed address, and |
| * optionally the parsed size. |
| * |
| * This variant assumes a known and fixed number of cells are used to |
| * represent the address and size. |
| * |
| * You probably don't want to use this function directly except to parse |
| * non-standard properties, and never to parse the "reg" property. Instead, |
| * use one of the "auto" variants below, which automatically honor the |
| * #address-cells and #size-cells properties in the parent node. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param index which address to retrieve from a list of addresses. Often 0. |
| * @param na the number of cells used to represent an address |
| * @param ns the number of cells used to represent a size |
| * @param sizep a pointer to store the size into. Use NULL if not required |
| * @param translate Indicates whether to translate the returned value |
| * using the parent node's ranges property. |
| * @return address, if found, or FDT_ADDR_T_NONE if not |
| */ |
| fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node, |
| const char *prop_name, int index, int na, int ns, |
| fdt_size_t *sizep, bool translate); |
| |
| /* |
| * Look up an address property in a node and return the parsed address, and |
| * optionally the parsed size. |
| * |
| * This variant automatically determines the number of cells used to represent |
| * the address and size by parsing the provided parent node's #address-cells |
| * and #size-cells properties. |
| * |
| * @param blob FDT blob |
| * @param parent parent node of @node |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param index which address to retrieve from a list of addresses. Often 0. |
| * @param sizep a pointer to store the size into. Use NULL if not required |
| * @param translate Indicates whether to translate the returned value |
| * using the parent node's ranges property. |
| * @return address, if found, or FDT_ADDR_T_NONE if not |
| */ |
| fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent, |
| int node, const char *prop_name, int index, fdt_size_t *sizep, |
| bool translate); |
| |
| /* |
| * Look up an address property in a node and return the parsed address, and |
| * optionally the parsed size. |
| * |
| * This variant automatically determines the number of cells used to represent |
| * the address and size by parsing the parent node's #address-cells |
| * and #size-cells properties. The parent node is automatically found. |
| * |
| * The automatic parent lookup implemented by this function is slow. |
| * Consequently, fdtdec_get_addr_size_auto_parent() should be used where |
| * possible. |
| * |
| * @param blob FDT blob |
| * @param parent parent node of @node |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param index which address to retrieve from a list of addresses. Often 0. |
| * @param sizep a pointer to store the size into. Use NULL if not required |
| * @param translate Indicates whether to translate the returned value |
| * using the parent node's ranges property. |
| * @return address, if found, or FDT_ADDR_T_NONE if not |
| */ |
| fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node, |
| const char *prop_name, int index, fdt_size_t *sizep, |
| bool translate); |
| |
| /* |
| * Look up an address property in a node and return the parsed address. |
| * |
| * This variant hard-codes the number of cells used to represent the address |
| * and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also |
| * always returns the first address value in the property (index 0). |
| * |
| * Use of this function is not recommended due to the hard-coding of cell |
| * counts. There is no programmatic validation that these hard-coded values |
| * actually match the device tree content in any way at all. This assumption |
| * can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately |
| * set in the U-Boot build and exercising strict control over DT content to |
| * ensure use of matching #address-cells/#size-cells properties. However, this |
| * approach is error-prone; those familiar with DT will not expect the |
| * assumption to exist, and could easily invalidate it. If the assumption is |
| * invalidated, this function will not report the issue, and debugging will |
| * be required. Instead, use fdtdec_get_addr_size_auto_parent(). |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @return address, if found, or FDT_ADDR_T_NONE if not |
| */ |
| fdt_addr_t fdtdec_get_addr(const void *blob, int node, |
| const char *prop_name); |
| |
| /* |
| * Look up an address property in a node and return the parsed address, and |
| * optionally the parsed size. |
| * |
| * This variant hard-codes the number of cells used to represent the address |
| * and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also |
| * always returns the first address value in the property (index 0). |
| * |
| * Use of this function is not recommended due to the hard-coding of cell |
| * counts. There is no programmatic validation that these hard-coded values |
| * actually match the device tree content in any way at all. This assumption |
| * can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately |
| * set in the U-Boot build and exercising strict control over DT content to |
| * ensure use of matching #address-cells/#size-cells properties. However, this |
| * approach is error-prone; those familiar with DT will not expect the |
| * assumption to exist, and could easily invalidate it. If the assumption is |
| * invalidated, this function will not report the issue, and debugging will |
| * be required. Instead, use fdtdec_get_addr_size_auto_parent(). |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param sizep a pointer to store the size into. Use NULL if not required |
| * @return address, if found, or FDT_ADDR_T_NONE if not |
| */ |
| fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, |
| const char *prop_name, fdt_size_t *sizep); |
| |
| /** |
| * Look at an address property in a node and return the pci address which |
| * corresponds to the given type in the form of fdt_pci_addr. |
| * The property must hold one fdt_pci_addr with a lengh. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param type pci address type (FDT_PCI_SPACE_xxx) |
| * @param prop_name name of property to find |
| * @param addr returns pci address in the form of fdt_pci_addr |
| * @return 0 if ok, -ENOENT if the property did not exist, -EINVAL if the |
| * format of the property was invalid, -ENXIO if the requested |
| * address type was not found |
| */ |
| int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type, |
| const char *prop_name, struct fdt_pci_addr *addr); |
| |
| /** |
| * Look at the compatible property of a device node that represents a PCI |
| * device and extract pci vendor id and device id from it. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param vendor vendor id of the pci device |
| * @param device device id of the pci device |
| * @return 0 if ok, negative on error |
| */ |
| int fdtdec_get_pci_vendev(const void *blob, int node, |
| u16 *vendor, u16 *device); |
| |
| /** |
| * Look at the pci address of a device node that represents a PCI device |
| * and return base address of the pci device's registers. |
| * |
| * @param dev device to examine |
| * @param addr pci address in the form of fdt_pci_addr |
| * @param bar returns base address of the pci device's registers |
| * @return 0 if ok, negative on error |
| */ |
| int fdtdec_get_pci_bar32(struct udevice *dev, struct fdt_pci_addr *addr, |
| u32 *bar); |
| |
| /** |
| * Look up a 32-bit integer property in a node and return it. The property |
| * must have at least 4 bytes of data. The value of the first cell is |
| * returned. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param default_val default value to return if the property is not found |
| * @return integer value, if found, or default_val if not |
| */ |
| s32 fdtdec_get_int(const void *blob, int node, const char *prop_name, |
| s32 default_val); |
| |
| /** |
| * Unsigned version of fdtdec_get_int. The property must have at least |
| * 4 bytes of data. The value of the first cell is returned. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param default_val default value to return if the property is not found |
| * @return unsigned integer value, if found, or default_val if not |
| */ |
| unsigned int fdtdec_get_uint(const void *blob, int node, const char *prop_name, |
| unsigned int default_val); |
| |
| /** |
| * Get a variable-sized number from a property |
| * |
| * This reads a number from one or more cells. |
| * |
| * @param ptr Pointer to property |
| * @param cells Number of cells containing the number |
| * @return the value in the cells |
| */ |
| u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells); |
| |
| /** |
| * Look up a 64-bit integer property in a node and return it. The property |
| * must have at least 8 bytes of data (2 cells). The first two cells are |
| * concatenated to form a 8 bytes value, where the first cell is top half and |
| * the second cell is bottom half. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param default_val default value to return if the property is not found |
| * @return integer value, if found, or default_val if not |
| */ |
| uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, |
| uint64_t default_val); |
| |
| /** |
| * Checks whether a node is enabled. |
| * This looks for a 'status' property. If this exists, then returns 1 if |
| * the status is 'ok' and 0 otherwise. If there is no status property, |
| * it returns 1 on the assumption that anything mentioned should be enabled |
| * by default. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @return integer value 0 (not enabled) or 1 (enabled) |
| */ |
| int fdtdec_get_is_enabled(const void *blob, int node); |
| |
| /** |
| * Make sure we have a valid fdt available to control U-Boot. |
| * |
| * If not, a message is printed to the console if the console is ready. |
| * |
| * @return 0 if all ok, -1 if not |
| */ |
| int fdtdec_prepare_fdt(void); |
| |
| /** |
| * Checks that we have a valid fdt available to control U-Boot. |
| |
| * However, if not then for the moment nothing is done, since this function |
| * is called too early to panic(). |
| * |
| * @returns 0 |
| */ |
| int fdtdec_check_fdt(void); |
| |
| /** |
| * Find the nodes for a peripheral and return a list of them in the correct |
| * order. This is used to enumerate all the peripherals of a certain type. |
| * |
| * To use this, optionally set up a /aliases node with alias properties for |
| * a peripheral. For example, for usb you could have: |
| * |
| * aliases { |
| * usb0 = "/ehci@c5008000"; |
| * usb1 = "/ehci@c5000000"; |
| * }; |
| * |
| * Pass "usb" as the name to this function and will return a list of two |
| * nodes offsets: /ehci@c5008000 and ehci@c5000000. |
| * |
| * All nodes returned will match the compatible ID, as it is assumed that |
| * all peripherals use the same driver. |
| * |
| * If no alias node is found, then the node list will be returned in the |
| * order found in the fdt. If the aliases mention a node which doesn't |
| * exist, then this will be ignored. If nodes are found with no aliases, |
| * they will be added in any order. |
| * |
| * If there is a gap in the aliases, then this function return a 0 node at |
| * that position. The return value will also count these gaps. |
| * |
| * This function checks node properties and will not return nodes which are |
| * marked disabled (status = "disabled"). |
| * |
| * @param blob FDT blob to use |
| * @param name Root name of alias to search for |
| * @param id Compatible ID to look for |
| * @param node_list Place to put list of found nodes |
| * @param maxcount Maximum number of nodes to find |
| * @return number of nodes found on success, FDT_ERR_... on error |
| */ |
| int fdtdec_find_aliases_for_id(const void *blob, const char *name, |
| enum fdt_compat_id id, int *node_list, int maxcount); |
| |
| /* |
| * This function is similar to fdtdec_find_aliases_for_id() except that it |
| * adds to the node_list that is passed in. Any 0 elements are considered |
| * available for allocation - others are considered already used and are |
| * skipped. |
| * |
| * You can use this by calling fdtdec_find_aliases_for_id() with an |
| * uninitialised array, then setting the elements that are returned to -1, |
| * say, then calling this function, perhaps with a different compat id. |
| * Any elements you get back that are >0 are new nodes added by the call |
| * to this function. |
| * |
| * Note that if you have some nodes with aliases and some without, you are |
| * sailing close to the wind. The call to fdtdec_find_aliases_for_id() with |
| * one compat_id may fill in positions for which you have aliases defined |
| * for another compat_id. When you later call *this* function with the second |
| * compat_id, the alias positions may already be used. A debug warning may |
| * be generated in this case, but it is safest to define aliases for all |
| * nodes when you care about the ordering. |
| */ |
| int fdtdec_add_aliases_for_id(const void *blob, const char *name, |
| enum fdt_compat_id id, int *node_list, int maxcount); |
| |
| /** |
| * Get the alias sequence number of a node |
| * |
| * This works out whether a node is pointed to by an alias, and if so, the |
| * sequence number of that alias. Aliases are of the form <base><num> where |
| * <num> is the sequence number. For example spi2 would be sequence number |
| * 2. |
| * |
| * @param blob Device tree blob (if NULL, then error is returned) |
| * @param base Base name for alias (before the underscore) |
| * @param node Node to look up |
| * @param seqp This is set to the sequence number if one is found, |
| * but otherwise the value is left alone |
| * @return 0 if a sequence was found, -ve if not |
| */ |
| int fdtdec_get_alias_seq(const void *blob, const char *base, int node, |
| int *seqp); |
| |
| /** |
| * Get a property from the /chosen node |
| * |
| * @param blob Device tree blob (if NULL, then NULL is returned) |
| * @param name Property name to look up |
| * @return Value of property, or NULL if it does not exist |
| */ |
| const char *fdtdec_get_chosen_prop(const void *blob, const char *name); |
| |
| /** |
| * Get the offset of the given /chosen node |
| * |
| * This looks up a property in /chosen containing the path to another node, |
| * then finds the offset of that node. |
| * |
| * @param blob Device tree blob (if NULL, then error is returned) |
| * @param name Property name, e.g. "stdout-path" |
| * @return Node offset referred to by that chosen node, or -ve FDT_ERR_... |
| */ |
| int fdtdec_get_chosen_node(const void *blob, const char *name); |
| |
| /* |
| * Get the name for a compatible ID |
| * |
| * @param id Compatible ID to look for |
| * @return compatible string for that id |
| */ |
| const char *fdtdec_get_compatible(enum fdt_compat_id id); |
| |
| /* Look up a phandle and follow it to its node. Then return the offset |
| * of that node. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @return node offset if found, -ve error code on error |
| */ |
| int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name); |
| |
| /** |
| * Look up a property in a node and return its contents in an integer |
| * array of given length. The property must have at least enough data for |
| * the array (4*count bytes). It may have more, but this will be ignored. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param array array to fill with data |
| * @param count number of array elements |
| * @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found, |
| * or -FDT_ERR_BADLAYOUT if not enough data |
| */ |
| int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, |
| u32 *array, int count); |
| |
| /** |
| * Look up a property in a node and return its contents in an integer |
| * array of given length. The property must exist but may have less data that |
| * expected (4*count bytes). It may have more, but this will be ignored. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param array array to fill with data |
| * @param count number of array elements |
| * @return number of array elements if ok, or -FDT_ERR_NOTFOUND if the |
| * property is not found |
| */ |
| int fdtdec_get_int_array_count(const void *blob, int node, |
| const char *prop_name, u32 *array, int count); |
| |
| /** |
| * Look up a property in a node and return a pointer to its contents as a |
| * unsigned int array of given length. The property must have at least enough |
| * data for the array ('count' cells). It may have more, but this will be |
| * ignored. The data is not copied. |
| * |
| * Note that you must access elements of the array with fdt32_to_cpu(), |
| * since the elements will be big endian even on a little endian machine. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param count number of array elements |
| * @return pointer to array if found, or NULL if the property is not |
| * found or there is not enough data |
| */ |
| const u32 *fdtdec_locate_array(const void *blob, int node, |
| const char *prop_name, int count); |
| |
| /** |
| * Look up a boolean property in a node and return it. |
| * |
| * A boolean properly is true if present in the device tree and false if not |
| * present, regardless of its value. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @return 1 if the properly is present; 0 if it isn't present |
| */ |
| int fdtdec_get_bool(const void *blob, int node, const char *prop_name); |
| |
| /* |
| * Count child nodes of one parent node. |
| * |
| * @param blob FDT blob |
| * @param node parent node |
| * @return number of child node; 0 if there is not child node |
| */ |
| int fdtdec_get_child_count(const void *blob, int node); |
| |
| /** |
| * Look in the FDT for a config item with the given name and return its value |
| * as a 32-bit integer. The property must have at least 4 bytes of data. The |
| * value of the first cell is returned. |
| * |
| * @param blob FDT blob to use |
| * @param prop_name Node property name |
| * @param default_val default value to return if the property is not found |
| * @return integer value, if found, or default_val if not |
| */ |
| int fdtdec_get_config_int(const void *blob, const char *prop_name, |
| int default_val); |
| |
| /** |
| * Look in the FDT for a config item with the given name |
| * and return whether it exists. |
| * |
| * @param blob FDT blob |
| * @param prop_name property name to look up |
| * @return 1, if it exists, or 0 if not |
| */ |
| int fdtdec_get_config_bool(const void *blob, const char *prop_name); |
| |
| /** |
| * Look in the FDT for a config item with the given name and return its value |
| * as a string. |
| * |
| * @param blob FDT blob |
| * @param prop_name property name to look up |
| * @returns property string, NULL on error. |
| */ |
| char *fdtdec_get_config_string(const void *blob, const char *prop_name); |
| |
| /* |
| * Look up a property in a node and return its contents in a byte |
| * array of given length. The property must have at least enough data for |
| * the array (count bytes). It may have more, but this will be ignored. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param array array to fill with data |
| * @param count number of array elements |
| * @return 0 if ok, or -FDT_ERR_MISSING if the property is not found, |
| * or -FDT_ERR_BADLAYOUT if not enough data |
| */ |
| int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, |
| u8 *array, int count); |
| |
| /** |
| * Look up a property in a node and return a pointer to its contents as a |
| * byte array of given length. The property must have at least enough data |
| * for the array (count bytes). It may have more, but this will be ignored. |
| * The data is not copied. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param count number of array elements |
| * @return pointer to byte array if found, or NULL if the property is not |
| * found or there is not enough data |
| */ |
| const u8 *fdtdec_locate_byte_array(const void *blob, int node, |
| const char *prop_name, int count); |
| |
| /** |
| * Look up a property in a node which contains a memory region address and |
| * size. Then return a pointer to this address. |
| * |
| * The property must hold one address with a length. This is only tested on |
| * 32-bit machines. |
| * |
| * @param blob FDT blob |
| * @param node node to examine |
| * @param prop_name name of property to find |
| * @param basep Returns base address of region |
| * @param size Returns size of region |
| * @return 0 if ok, -1 on error (property not found) |
| */ |
| int fdtdec_decode_region(const void *blob, int node, const char *prop_name, |
| fdt_addr_t *basep, fdt_size_t *sizep); |
| |
| /** |
| * Obtain an indexed resource from a device property. |
| * |
| * @param fdt FDT blob |
| * @param node node to examine |
| * @param property name of the property to parse |
| * @param index index of the resource to retrieve |
| * @param res returns the resource |
| * @return 0 if ok, negative on error |
| */ |
| int fdt_get_resource(const void *fdt, int node, const char *property, |
| unsigned int index, struct fdt_resource *res); |
| |
| /** |
| * Obtain a named resource from a device property. |
| * |
| * Look up the index of the name in a list of strings and return the resource |
| * at that index. |
| * |
| * @param fdt FDT blob |
| * @param node node to examine |
| * @param property name of the property to parse |
| * @param prop_names name of the property containing the list of names |
| * @param name the name of the entry to look up |
| * @param res returns the resource |
| */ |
| int fdt_get_named_resource(const void *fdt, int node, const char *property, |
| const char *prop_names, const char *name, |
| struct fdt_resource *res); |
| |
| /** |
| * Decode a named region within a memory bank of a given type. |
| * |
| * This function handles selection of a memory region. The region is |
| * specified as an offset/size within a particular type of memory. |
| * |
| * The properties used are: |
| * |
| * <mem_type>-memory<suffix> for the name of the memory bank |
| * <mem_type>-offset<suffix> for the offset in that bank |
| * |
| * The property value must have an offset and a size. The function checks |
| * that the region is entirely within the memory bank.5 |
| * |
| * @param blob FDT blob |
| * @param node Node containing the properties (-1 for /config) |
| * @param mem_type Type of memory to use, which is a name, such as |
| * "u-boot" or "kernel". |
| * @param suffix String to append to the memory/offset |
| * property names |
| * @param basep Returns base of region |
| * @param sizep Returns size of region |
| * @return 0 if OK, -ive on error |
| */ |
| int fdtdec_decode_memory_region(const void *blob, int node, |
| const char *mem_type, const char *suffix, |
| fdt_addr_t *basep, fdt_size_t *sizep); |
| |
| /* Display timings from linux include/video/display_timing.h */ |
| enum display_flags { |
| DISPLAY_FLAGS_HSYNC_LOW = 1 << 0, |
| DISPLAY_FLAGS_HSYNC_HIGH = 1 << 1, |
| DISPLAY_FLAGS_VSYNC_LOW = 1 << 2, |
| DISPLAY_FLAGS_VSYNC_HIGH = 1 << 3, |
| |
| /* data enable flag */ |
| DISPLAY_FLAGS_DE_LOW = 1 << 4, |
| DISPLAY_FLAGS_DE_HIGH = 1 << 5, |
| /* drive data on pos. edge */ |
| DISPLAY_FLAGS_PIXDATA_POSEDGE = 1 << 6, |
| /* drive data on neg. edge */ |
| DISPLAY_FLAGS_PIXDATA_NEGEDGE = 1 << 7, |
| DISPLAY_FLAGS_INTERLACED = 1 << 8, |
| DISPLAY_FLAGS_DOUBLESCAN = 1 << 9, |
| DISPLAY_FLAGS_DOUBLECLK = 1 << 10, |
| }; |
| |
| /* |
| * A single signal can be specified via a range of minimal and maximal values |
| * with a typical value, that lies somewhere inbetween. |
| */ |
| struct timing_entry { |
| u32 min; |
| u32 typ; |
| u32 max; |
| }; |
| |
| /* |
| * Single "mode" entry. This describes one set of signal timings a display can |
| * have in one setting. This struct can later be converted to struct videomode |
| * (see include/video/videomode.h). As each timing_entry can be defined as a |
| * range, one struct display_timing may become multiple struct videomodes. |
| * |
| * Example: hsync active high, vsync active low |
| * |
| * Active Video |
| * Video ______________________XXXXXXXXXXXXXXXXXXXXXX_____________________ |
| * |<- sync ->|<- back ->|<----- active ----->|<- front ->|<- sync.. |
| * | | porch | | porch | |
| * |
| * HSync _|¯¯¯¯¯¯¯¯¯¯|___________________________________________|¯¯¯¯¯¯¯¯¯ |
| * |
| * VSync ¯|__________|¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|_________ |
| */ |
| struct display_timing { |
| struct timing_entry pixelclock; |
| |
| struct timing_entry hactive; /* hor. active video */ |
| struct timing_entry hfront_porch; /* hor. front porch */ |
| struct timing_entry hback_porch; /* hor. back porch */ |
| struct timing_entry hsync_len; /* hor. sync len */ |
| |
| struct timing_entry vactive; /* ver. active video */ |
| struct timing_entry vfront_porch; /* ver. front porch */ |
| struct timing_entry vback_porch; /* ver. back porch */ |
| struct timing_entry vsync_len; /* ver. sync len */ |
| |
| enum display_flags flags; /* display flags */ |
| bool hdmi_monitor; /* is hdmi monitor? */ |
| }; |
| |
| /** |
| * fdtdec_decode_display_timing() - decode display timings |
| * |
| * Decode display timings from the supplied 'display-timings' node. |
| * See doc/device-tree-bindings/video/display-timing.txt for binding |
| * information. |
| * |
| * @param blob FDT blob |
| * @param node 'display-timing' node containing the timing subnodes |
| * @param index Index number to read (0=first timing subnode) |
| * @param config Place to put timings |
| * @return 0 if OK, -FDT_ERR_NOTFOUND if not found |
| */ |
| int fdtdec_decode_display_timing(const void *blob, int node, int index, |
| struct display_timing *config); |
| |
| /** |
| * fdtdec_setup_memory_size() - decode and setup gd->ram_size |
| * |
| * Decode the /memory 'reg' property to determine the size of the first memory |
| * bank, populate the global data with the size of the first bank of memory. |
| * |
| * This function should be called from a boards dram_init(). This helper |
| * function allows for boards to query the device tree for DRAM size instead of |
| * hard coding the value in the case where the memory size cannot be detected |
| * automatically. |
| * |
| * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or |
| * invalid |
| */ |
| int fdtdec_setup_memory_size(void); |
| |
| /** |
| * fdtdec_setup_memory_banksize() - decode and populate gd->bd->bi_dram |
| * |
| * Decode the /memory 'reg' property to determine the address and size of the |
| * memory banks. Use this data to populate the global data board info with the |
| * phys address and size of memory banks. |
| * |
| * This function should be called from a boards dram_init_banksize(). This |
| * helper function allows for boards to query the device tree for memory bank |
| * information instead of hard coding the information in cases where it cannot |
| * be detected automatically. |
| * |
| * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or |
| * invalid |
| */ |
| int fdtdec_setup_memory_banksize(void); |
| |
| /** |
| * Set up the device tree ready for use |
| */ |
| int fdtdec_setup(void); |
| |
| /** |
| * Board-specific FDT initialization. Returns the address to a device tree blob. |
| * Called when CONFIG_OF_BOARD is defined, or if CONFIG_OF_SEPARATE is defined |
| * and the board implements it. |
| */ |
| void *board_fdt_blob_setup(void); |
| |
| #endif |