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qemu/include/sysemu/device_tree.h
Paolo Bonzini 1935b7ead1 kconfig: allow compiling out QEMU device tree code per target 
Introduce a new Kconfig symbol, CONFIG_DEVICE_TREE, that specifies whether
to include the common device tree code in system/device_tree.c and to
link to libfdt.  For now, include it unconditionally if libfdt is
available.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-05-10 15:45:15 +02:00

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/*
* Header with function prototypes to help device tree manipulation using
* libfdt. It also provides functions to read entries from device tree proc
* interface.
*
* Copyright 2008 IBM Corporation.
* Authors: Jerone Young <jyoung5@us.ibm.com>
* Hollis Blanchard <hollisb@us.ibm.com>
*
* This work is licensed under the GNU GPL license version 2 or later.
*
*/
#ifndef DEVICE_TREE_H
#define DEVICE_TREE_H
void *create_device_tree(int *sizep);
void *load_device_tree(const char *filename_path, int *sizep);
#ifdef CONFIG_LINUX
/**
* load_device_tree_from_sysfs: reads the device tree information in the
* /proc/device-tree directory and return the corresponding binary blob
* buffer pointer. Asserts in case of error.
*/
void *load_device_tree_from_sysfs(void);
#endif
/**
* qemu_fdt_node_path: return the paths of nodes matching a given
* name and compat string
* @fdt: pointer to the dt blob
* @name: node name
* @compat: compatibility string
* @errp: handle to an error object
*
* returns a newly allocated NULL-terminated array of node paths.
* Use g_strfreev() to free it. If one or more nodes were found, the
* array contains the path of each node and the last element equals to
* NULL. If there is no error but no matching node was found, the
* returned array contains a single element equal to NULL. If an error
* was encountered when parsing the blob, the function returns NULL
*
* @name may be NULL to wildcard names and only match compatibility
* strings.
*/
char **qemu_fdt_node_path(void *fdt, const char *name, const char *compat,
Error **errp);
/**
* qemu_fdt_node_unit_path: return the paths of nodes matching a given
* node-name, ie. node-name and node-name@unit-address
* @fdt: pointer to the dt blob
* @name: node name
* @errp: handle to an error object
*
* returns a newly allocated NULL-terminated array of node paths.
* Use g_strfreev() to free it. If one or more nodes were found, the
* array contains the path of each node and the last element equals to
* NULL. If there is no error but no matching node was found, the
* returned array contains a single element equal to NULL. If an error
* was encountered when parsing the blob, the function returns NULL
*/
char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp);
int qemu_fdt_setprop(void *fdt, const char *node_path,
const char *property, const void *val, int size);
int qemu_fdt_setprop_cell(void *fdt, const char *node_path,
const char *property, uint32_t val);
int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
const char *property, uint64_t val);
int qemu_fdt_setprop_string(void *fdt, const char *node_path,
const char *property, const char *string);
/**
* qemu_fdt_setprop_string_array: set a string array property
*
* @fdt: pointer to the dt blob
* @name: node name
* @prop: property array
* @array: pointer to an array of string pointers
* @len: length of array
*
* assigns a string array to a property. This function converts and
* array of strings to a sequential string with \0 separators before
* setting the property.
*/
int qemu_fdt_setprop_string_array(void *fdt, const char *node_path,
const char *prop, char **array, int len);
int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
const char *property,
const char *target_node_path);
/**
* qemu_fdt_getprop: retrieve the value of a given property
* @fdt: pointer to the device tree blob
* @node_path: node path
* @property: name of the property to find
* @lenp: fdt error if any or length of the property on success
* @errp: handle to an error object
*
* returns a pointer to the property on success and NULL on failure
*/
const void *qemu_fdt_getprop(void *fdt, const char *node_path,
const char *property, int *lenp,
Error **errp);
/**
* qemu_fdt_getprop_cell: retrieve the value of a given 4 byte property
* @fdt: pointer to the device tree blob
* @node_path: node path
* @property: name of the property to find
* @lenp: fdt error if any or -EINVAL if the property size is different from
* 4 bytes, or 4 (expected length of the property) upon success.
* @errp: handle to an error object
*
* returns the property value on success
*/
uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
const char *property, int *lenp,
Error **errp);
uint32_t qemu_fdt_get_phandle(void *fdt, const char *path);
uint32_t qemu_fdt_alloc_phandle(void *fdt);
int qemu_fdt_nop_node(void *fdt, const char *node_path);
int qemu_fdt_add_subnode(void *fdt, const char *name);
int qemu_fdt_add_path(void *fdt, const char *path);
#define qemu_fdt_setprop_cells(fdt, node_path, property, ...) \
do { \
uint32_t qdt_tmp[] = { __VA_ARGS__ }; \
for (unsigned i_ = 0; i_ < ARRAY_SIZE(qdt_tmp); i_++) { \
qdt_tmp[i_] = cpu_to_be32(qdt_tmp[i_]); \
} \
qemu_fdt_setprop(fdt, node_path, property, qdt_tmp, \
sizeof(qdt_tmp)); \
} while (0)
void qemu_fdt_dumpdtb(void *fdt, int size);
/**
* qemu_fdt_setprop_sized_cells_from_array:
* @fdt: device tree blob
* @node_path: node to set property on
* @property: property to set
* @numvalues: number of values
* @values: array of number-of-cells, value pairs
*
* Set the specified property on the specified node in the device tree
* to be an array of cells. The values of the cells are specified via
* the values list, which alternates between "number of cells used by
* this value" and "value".
* number-of-cells must be either 1 or 2 (other values will result in
* an error being returned). If a value is too large to fit in the
* number of cells specified for it, an error is returned.
*
* This function is useful because device tree nodes often have cell arrays
* which are either lists of addresses or lists of address,size tuples, but
* the number of cells used for each element vary depending on the
* #address-cells and #size-cells properties of their parent node.
* If you know all your cell elements are one cell wide you can use the
* simpler qemu_fdt_setprop_cells(). If you're not setting up the
* array programmatically, qemu_fdt_setprop_sized_cells may be more
* convenient.
*
* Return value: 0 on success, <0 on error.
*/
int qemu_fdt_setprop_sized_cells_from_array(void *fdt,
const char *node_path,
const char *property,
int numvalues,
uint64_t *values);
/**
* qemu_fdt_setprop_sized_cells:
* @fdt: device tree blob
* @node_path: node to set property on
* @property: property to set
* @...: list of number-of-cells, value pairs
*
* Set the specified property on the specified node in the device tree
* to be an array of cells. The values of the cells are specified via
* the variable arguments, which alternates between "number of cells
* used by this value" and "value".
*
* This is a convenience wrapper for the function
* qemu_fdt_setprop_sized_cells_from_array().
*
* Return value: 0 on success, <0 on error.
*/
#define qemu_fdt_setprop_sized_cells(fdt, node_path, property, ...) \
({ \
uint64_t qdt_tmp[] = { __VA_ARGS__ }; \
qemu_fdt_setprop_sized_cells_from_array(fdt, node_path, \
property, \
ARRAY_SIZE(qdt_tmp) / 2, \
qdt_tmp); \
})
/**
* qemu_fdt_randomize_seeds:
* @fdt: device tree blob
*
* Re-randomize all "rng-seed" properties with new seeds.
*/
void qemu_fdt_randomize_seeds(void *fdt);
#define FDT_PCI_RANGE_RELOCATABLE 0x80000000
#define FDT_PCI_RANGE_PREFETCHABLE 0x40000000
#define FDT_PCI_RANGE_ALIASED 0x20000000
#define FDT_PCI_RANGE_TYPE_MASK 0x03000000
#define FDT_PCI_RANGE_MMIO_64BIT 0x03000000
#define FDT_PCI_RANGE_MMIO 0x02000000
#define FDT_PCI_RANGE_IOPORT 0x01000000
#define FDT_PCI_RANGE_CONFIG 0x00000000
#endif /* DEVICE_TREE_H */
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