blob: bd1149f46d08d00d0ec186be923e9f8b899a0391 [file] [log] [blame]
/* 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>
/*
* Support for 64bit fdt addresses.
* This can be used not only for 64bit SoCs, but also
* for large address extensions on 32bit SoCs.
* Note that fdt data is always big
* endian even on a litle endian machine.
*/
#define FDT_SIZE_T_NONE (-1U)
#ifdef CONFIG_FDT_64BIT
typedef u64 fdt_addr_t;
typedef u64 fdt_size_t;
#define FDT_ADDR_T_NONE ((ulong)(-1))
#define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
#define fdt_size_to_cpu(reg) be64_to_cpu(reg)
#define cpu_to_fdt_addr(reg) cpu_to_be64(reg)
#define cpu_to_fdt_size(reg) cpu_to_be64(reg)
typedef fdt64_t fdt_val_t;
#else
typedef u32 fdt_addr_t;
typedef u32 fdt_size_t;
#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)
#define cpu_to_fdt_addr(reg) cpu_to_be32(reg)
#define cpu_to_fdt_size(reg) cpu_to_be32(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;
};
struct bd_info;
/**
* enum fdt_source_t - indicates where the devicetree came from
*
* These are listed in approximate order of desirability after FDTSRC_NONE
*
* @FDTSRC_SEPARATE: Appended to U-Boot. This is the normal approach if U-Boot
* is the only firmware being booted
* @FDTSRC_FIT: Found in a multi-dtb FIT. This should be used when U-Boot must
* select a devicetree from many options
* @FDTSRC_BOARD: Located by custom board code. This should only be used when
* the prior stage does not support FDTSRC_PASSAGE
* @FDTSRC_EMBED: Embedded into U-Boot executable. This should onyl be used when
* U-Boot is packaged as an ELF file, e.g. for debugging purposes
* @FDTSRC_ENV: Provided by the fdtcontroladdr environment variable. This should
* be used for debugging/development only
* @FDTSRC_NONE: No devicetree at all
*/
enum fdt_source_t {
FDTSRC_SEPARATE,
FDTSRC_FIT,
FDTSRC_BOARD,
FDTSRC_EMBED,
FDTSRC_ENV,
};
/*
* 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;
};
extern u8 __dtb_dt_begin[]; /* embedded device tree blob */
extern u8 __dtb_dt_spl_begin[]; /* embedded device tree blob for SPL/TPL */
/* Get a pointer to the embedded devicetree, if there is one, else NULL */
static inline u8 *dtb_dt_embedded(void)
{
#ifdef CONFIG_OF_EMBED
# ifdef CONFIG_SPL_BUILD
return __dtb_dt_spl_begin;
# else
return __dtb_dt_begin;
# endif
#else
return NULL;
#endif
}
/**
* 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_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_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */
COMPAT_SAMSUNG_EXYNOS_SYSMMU, /* Exynos sysmmu */
COMPAT_INTEL_MICROCODE, /* Intel microcode update */
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_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_ALTERA_SOCFPGA_CLK_INIT, /* SOCFPGA Arria 10 clk init */
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 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(const struct udevice *dev, struct fdt_pci_addr *addr,
u32 *bar);
/**
* Look at the bus range property of a device node and return the pci bus
* range for this node.
* The property must hold one fdt_pci_addr with a length.
* @param blob FDT blob
* @param node node to examine
* @param res the resource structure to return the bus range
* Return: 0 if ok, negative on error
*/
int fdtdec_get_pci_bus_range(const void *blob, int node,
struct fdt_resource *res);
/**
* 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);
/**
* 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 the highest alias number for susbystem.
*
* It parses all aliases and find out highest recorded alias for subsystem.
* Aliases are of the form <base><num> where <num> is the sequence number.
*
* @param blob Device tree blob (if NULL, then error is returned)
* @param base Base name for alias susbystem (before the number)
*
* Return: 0 highest alias ID, -1 if not found
*/
int fdtdec_get_alias_highest_id(const void *blob, const char *base);
/**
* 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 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);
/**
* 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);
/* 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_mem_size_base() - decode and setup gd->ram_size and
* gd->ram_start
*
* Decode the /memory 'reg' property to determine the size and start of the
* first memory bank, populate the global data with the size and start 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 and start
* address instead of hard coding the value in the case where the memory size
* and start address cannot be detected automatically.
*
* Return: 0 if OK, -EINVAL if the /memory node or reg property is missing or
* invalid
*/
int fdtdec_setup_mem_size_base(void);
/**
* fdtdec_setup_mem_size_base_lowest() - decode and setup gd->ram_size and
* gd->ram_start by lowest available memory base
*
* Decode the /memory 'reg' property to determine the lowest start of the memory
* bank bank and populate the global data with it.
*
* This function should be called from a boards dram_init(). This helper
* function allows for boards to query the device tree for DRAM size and start
* address instead of hard coding the value in the case where the memory size
* and start address cannot be detected automatically.
*
* Return: 0 if OK, -EINVAL if the /memory node or reg property is missing or
* invalid
*/
int fdtdec_setup_mem_size_base_lowest(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);
/**
* fdtdec_set_ethernet_mac_address() - set MAC address for default interface
*
* Looks up the default interface via the "ethernet" alias (in the /aliases
* node) and stores the given MAC in its "local-mac-address" property. This
* is useful on platforms that store the MAC address in a custom location.
* Board code can call this in the late init stage to make sure that the
* interface device tree node has the right MAC address configured for the
* Ethernet uclass to pick it up.
*
* Typically the FDT passed into this function will be U-Boot's control DTB.
* Given that a lot of code may be holding offsets to various nodes in that
* tree, this code will only set the "local-mac-address" property in-place,
* which means that it needs to exist and have space for the 6-byte address.
* This ensures that the operation is non-destructive and does not invalidate
* offsets that other drivers may be using.
*
* @param fdt FDT blob
* @param mac buffer containing the MAC address to set
* @param size size of MAC address
* Return: 0 on success or a negative error code on failure
*/
int fdtdec_set_ethernet_mac_address(void *fdt, const u8 *mac, size_t size);
/**
* fdtdec_set_phandle() - sets the phandle of a given node
*
* @param blob FDT blob
* @param node offset in the FDT blob of the node whose phandle is to
* be set
* @param phandle phandle to set for the given node
* Return: 0 on success or a negative error code on failure
*/
static inline int fdtdec_set_phandle(void *blob, int node, uint32_t phandle)
{
return fdt_setprop_u32(blob, node, "phandle", phandle);
}
/* add "no-map" property */
#define FDTDEC_RESERVED_MEMORY_NO_MAP (1 << 0)
/**
* fdtdec_add_reserved_memory() - add or find a reserved-memory node
*
* If a reserved-memory node already exists for the given carveout, a phandle
* for that node will be returned. Otherwise a new node will be created and a
* phandle corresponding to it will be returned.
*
* See Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
* for details on how to use reserved memory regions.
*
* As an example, consider the following code snippet:
*
* struct fdt_memory fb = {
* .start = 0x92cb3000,
* .end = 0x934b2fff,
* };
* uint32_t phandle;
*
* fdtdec_add_reserved_memory(fdt, "framebuffer", &fb, NULL, 0, &phandle,
* 0);
*
* This results in the following subnode being added to the top-level
* /reserved-memory node:
*
* reserved-memory {
* #address-cells = <0x00000002>;
* #size-cells = <0x00000002>;
* ranges;
*
* framebuffer@92cb3000 {
* reg = <0x00000000 0x92cb3000 0x00000000 0x00800000>;
* phandle = <0x0000004d>;
* };
* };
*
* If the top-level /reserved-memory node does not exist, it will be created.
* The phandle returned from the function call can be used to reference this
* reserved memory region from other nodes.
*
* See fdtdec_set_carveout() for a more elaborate example.
*
* @param blob FDT blob
* @param basename base name of the node to create
* @param carveout information about the carveout region
* @param compatibles list of compatible strings for the carveout region
* @param count number of compatible strings for the carveout region
* @param phandlep return location for the phandle of the carveout region
* can be NULL if no phandle should be added
* @param flags bitmask of flags to set for the carveout region
* Return: 0 on success or a negative error code on failure
*/
int fdtdec_add_reserved_memory(void *blob, const char *basename,
const struct fdt_memory *carveout,
const char **compatibles, unsigned int count,
uint32_t *phandlep, unsigned long flags);
/**
* fdtdec_get_carveout() - reads a carveout from an FDT
*
* Reads information about a carveout region from an FDT. The carveout is a
* referenced by its phandle that is read from a given property in a given
* node.
*
* @param blob FDT blob
* @param node name of a node
* @param prop_name name of the property in the given node that contains
* the phandle for the carveout
* @param index index of the phandle for which to read the carveout
* @param carveout return location for the carveout information
* @param name return location for the carveout name
* @param compatiblesp return location for compatible strings
* @param countp return location for the number of compatible strings
* @param flags return location for the flags of the carveout
* Return: 0 on success or a negative error code on failure
*/
int fdtdec_get_carveout(const void *blob, const char *node,
const char *prop_name, unsigned int index,
struct fdt_memory *carveout, const char **name,
const char ***compatiblesp, unsigned int *countp,
unsigned long *flags);
/**
* fdtdec_set_carveout() - sets a carveout region for a given node
*
* Sets a carveout region for a given node. If a reserved-memory node already
* exists for the carveout, the phandle for that node will be reused. If no
* such node exists, a new one will be created and a phandle to it stored in
* a specified property of the given node.
*
* As an example, consider the following code snippet:
*
* const char *node = "/host1x@50000000/dc@54240000";
* struct fdt_memory fb = {
* .start = 0x92cb3000,
* .end = 0x934b2fff,
* };
*
* fdtdec_set_carveout(fdt, node, "memory-region", 0, "framebuffer", NULL,
* 0, &fb, 0);
*
* dc@54200000 is a display controller and was set up by the bootloader to
* scan out the framebuffer specified by "fb". This would cause the following
* reserved memory region to be added:
*
* reserved-memory {
* #address-cells = <0x00000002>;
* #size-cells = <0x00000002>;
* ranges;
*
* framebuffer@92cb3000 {
* reg = <0x00000000 0x92cb3000 0x00000000 0x00800000>;
* phandle = <0x0000004d>;
* };
* };
*
* A "memory-region" property will also be added to the node referenced by the
* offset parameter.
*
* host1x@50000000 {
* ...
*
* dc@54240000 {
* ...
* memory-region = <0x0000004d>;
* ...
* };
*
* ...
* };
*
* @param blob FDT blob
* @param node name of the node to add the carveout to
* @param prop_name name of the property in which to store the phandle of
* the carveout
* @param index index of the phandle to store
* @param carveout information about the carveout to add
* @param name base name of the reserved-memory node to create
* @param compatibles compatible strings to set for the carveout
* @param count number of compatible strings
* @param flags bitmask of flags to set for the carveout
* Return: 0 on success or a negative error code on failure
*/
int fdtdec_set_carveout(void *blob, const char *node, const char *prop_name,
unsigned int index, const struct fdt_memory *carveout,
const char *name, const char **compatibles,
unsigned int count, unsigned long flags);
/**
* Set up the device tree ready for use
*/
int fdtdec_setup(void);
/**
* Perform board-specific early DT adjustments
*/
int fdtdec_board_setup(const void *fdt_blob);
/**
* fdtdec_resetup() - Set up the device tree again
*
* The main difference with fdtdec_setup() is that it returns if the fdt has
* changed because a better match has been found.
* This is typically used for boards that rely on a DM driver to detect the
* board type. This function sould be called by the board code after the stuff
* needed by board_fit_config_name_match() to operate porperly is available.
* If this functions signals that a rescan is necessary, the board code must
* unbind all the drivers using dm_uninit() and then rescan the DT with
* dm_init_and_scan().
*
* @param rescan Returns a flag indicating that fdt has changed and rescanning
* the fdt is required
*
* Return: 0 if OK, -ve on error
*/
int fdtdec_resetup(int *rescan);
/**
* Board-specific FDT initialization. Returns the address to a device tree blob.
*
* Called when CONFIG_OF_BOARD is defined.
*
* The existing devicetree is available at gd->fdt_blob
*
* @err internal error code if we fail to setup a DTB
* @returns new devicetree blob pointer
*/
void *board_fdt_blob_setup(int *err);
/*
* Decode the size of memory
*
* RAM size is normally set in a /memory node and consists of a list of
* (base, size) cells in the 'reg' property. This information is used to
* determine the total available memory as well as the address and size
* of each bank.
*
* Optionally the memory configuration can vary depending on a board id,
* typically read from strapping resistors or an EEPROM on the board.
*
* Finally, memory size can be detected (within certain limits) by probing
* the available memory. It is safe to do so within the limits provides by
* the board's device tree information. This makes it possible to produce
* boards with different memory sizes, where the device tree specifies the
* maximum memory configuration, and the smaller memory configuration is
* probed.
*
* This function decodes that information, returning the memory base address,
* size and bank information. See the memory.txt binding for full
* documentation.
*
* @param blob Device tree blob
* @param area Name of node to check (NULL means "/memory")
* @param board_id Board ID to look up
* @param basep Returns base address of first memory bank (NULL to
* ignore)
* @param sizep Returns total memory size (NULL to ignore)
* @param bd Updated with the memory bank information (NULL to skip)
* Return: 0 if OK, -ve on error
*/
int fdtdec_decode_ram_size(const void *blob, const char *area, int board_id,
phys_addr_t *basep, phys_size_t *sizep,
struct bd_info *bd);
/**
* fdtdec_get_srcname() - Get the name of where the devicetree comes from
*
* Return: source name
*/
const char *fdtdec_get_srcname(void);
#endif