97c38f8c27
We already have a qemu_devtree_setprop_cells() which sets a dtb property to an array of cells whose values are specified by varargs. However for the fairly common case of setting a property to a list of addresses or of address,size pairs the number of cells used by each element in the list depends on the parent's #address-cells and #size-cells properties. To make this easier we provide an analogous qemu_devtree_setprop_sized_cells() macro which allows the number of cells used by each element to be specified. This is implemented using an underlying qemu_devtree_setprop_sized_cells_from_array() function which takes the values and sizes as an array; this may also be directly useful for cases where the cell contents are constructed programmatically. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Message-id: 1373977512-28932-2-git-send-email-peter.maydell@linaro.org
114 lines
5.3 KiB
C
114 lines
5.3 KiB
C
/*
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* Header with function prototypes to help device tree manipulation using
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* libfdt. It also provides functions to read entries from device tree proc
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* interface.
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*
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* Copyright 2008 IBM Corporation.
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* Authors: Jerone Young <jyoung5@us.ibm.com>
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* Hollis Blanchard <hollisb@us.ibm.com>
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*
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* This work is licensed under the GNU GPL license version 2 or later.
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*
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*/
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#ifndef __DEVICE_TREE_H__
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#define __DEVICE_TREE_H__
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void *create_device_tree(int *sizep);
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void *load_device_tree(const char *filename_path, int *sizep);
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int qemu_devtree_setprop(void *fdt, const char *node_path,
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const char *property, const void *val_array, int size);
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int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
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const char *property, uint32_t val);
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int qemu_devtree_setprop_u64(void *fdt, const char *node_path,
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const char *property, uint64_t val);
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int qemu_devtree_setprop_string(void *fdt, const char *node_path,
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const char *property, const char *string);
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int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
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const char *property,
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const char *target_node_path);
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const void *qemu_devtree_getprop(void *fdt, const char *node_path,
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const char *property, int *lenp);
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uint32_t qemu_devtree_getprop_cell(void *fdt, const char *node_path,
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const char *property);
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uint32_t qemu_devtree_get_phandle(void *fdt, const char *path);
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uint32_t qemu_devtree_alloc_phandle(void *fdt);
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int qemu_devtree_nop_node(void *fdt, const char *node_path);
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int qemu_devtree_add_subnode(void *fdt, const char *name);
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#define qemu_devtree_setprop_cells(fdt, node_path, property, ...) \
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do { \
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uint32_t qdt_tmp[] = { __VA_ARGS__ }; \
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int i; \
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\
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for (i = 0; i < ARRAY_SIZE(qdt_tmp); i++) { \
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qdt_tmp[i] = cpu_to_be32(qdt_tmp[i]); \
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} \
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qemu_devtree_setprop(fdt, node_path, property, qdt_tmp, \
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sizeof(qdt_tmp)); \
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} while (0)
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void qemu_devtree_dumpdtb(void *fdt, int size);
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/**
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* qemu_devtree_setprop_sized_cells_from_array:
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* @fdt: device tree blob
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* @node_path: node to set property on
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* @property: property to set
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* @numvalues: number of values
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* @values: array of number-of-cells, value pairs
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*
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* Set the specified property on the specified node in the device tree
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* to be an array of cells. The values of the cells are specified via
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* the values list, which alternates between "number of cells used by
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* this value" and "value".
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* number-of-cells must be either 1 or 2 (other values will result in
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* an error being returned). If a value is too large to fit in the
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* number of cells specified for it, an error is returned.
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*
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* This function is useful because device tree nodes often have cell arrays
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* which are either lists of addresses or lists of address,size tuples, but
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* the number of cells used for each element vary depending on the
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* #address-cells and #size-cells properties of their parent node.
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* If you know all your cell elements are one cell wide you can use the
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* simpler qemu_devtree_setprop_cells(). If you're not setting up the
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* array programmatically, qemu_devtree_setprop_sized_cells may be more
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* convenient.
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*
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* Return value: 0 on success, <0 on error.
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*/
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int qemu_devtree_setprop_sized_cells_from_array(void *fdt,
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const char *node_path,
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const char *property,
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int numvalues,
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uint64_t *values);
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/**
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* qemu_devtree_setprop_sized_cells:
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* @fdt: device tree blob
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* @node_path: node to set property on
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* @property: property to set
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* @...: list of number-of-cells, value pairs
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*
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* Set the specified property on the specified node in the device tree
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* to be an array of cells. The values of the cells are specified via
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* the variable arguments, which alternates between "number of cells
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* used by this value" and "value".
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*
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* This is a convenience wrapper for the function
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* qemu_devtree_setprop_sized_cells_from_array().
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*
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* Return value: 0 on success, <0 on error.
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*/
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#define qemu_devtree_setprop_sized_cells(fdt, node_path, property, ...) \
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({ \
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uint64_t qdt_tmp[] = { __VA_ARGS__ }; \
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qemu_devtree_setprop_sized_cells_from_array(fdt, node_path, \
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property, \
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ARRAY_SIZE(qdt_tmp) / 2, \
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qdt_tmp); \
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})
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#endif /* __DEVICE_TREE_H__ */
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