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![Simon Glass](/assets/img/avatar_default.png)
Add functions to add addresses in the device tree using ofnode references. Signed-off-by: Simon Glass <sjg@chromium.org>
579 lines
17 KiB
C
579 lines
17 KiB
C
/*
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* Copyright (c) 2017 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _DM_OFNODE_H
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#define _DM_OFNODE_H
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/* TODO(sjg@chromium.org): Drop fdtdec.h include */
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#include <fdtdec.h>
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#include <dm/of.h>
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/* Enable checks to protect against invalid calls */
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#undef OF_CHECKS
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/**
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* ofnode - reference to a device tree node
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*
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* This union can hold either a straightforward pointer to a struct device_node
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* in the live device tree, or an offset within the flat device tree. In the
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* latter case, the pointer value is just the integer offset within the flat DT.
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*
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* Thus we can reference nodes in both the live tree (once available) and the
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* flat tree (until then). Functions are available to translate between an
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* ofnode and either an offset or a struct device_node *.
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*
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* The reference can also hold a null offset, in which case the pointer value
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* here is NULL. This corresponds to a struct device_node * value of
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* NULL, or an offset of -1.
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*
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* There is no ambiguity as to whether ofnode holds an offset or a node
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* pointer: when the live tree is active it holds a node pointer, otherwise it
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* holds an offset. The value itself does not need to be unique and in theory
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* the same value could point to a valid device node or a valid offset. We
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* could arrange for a unique value to be used (e.g. by making the pointer
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* point to an offset within the flat device tree in the case of an offset) but
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* this increases code size slightly due to the subtraction. Since it offers no
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* real benefit, the approach described here seems best.
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*
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* For now these points use constant types, since we don't allow writing
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* the DT.
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*
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* @np: Pointer to device node, used for live tree
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* @flat_ptr: Pointer into flat device tree, used for flat tree. Note that this
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* is not a really a pointer to a node: it is an offset value. See above.
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*/
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typedef union ofnode_union {
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const struct device_node *np; /* will be used for future live tree */
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long of_offset;
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} ofnode;
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struct ofnode_phandle_args {
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ofnode node;
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int args_count;
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uint32_t args[OF_MAX_PHANDLE_ARGS];
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};
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/**
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* _ofnode_to_np() - convert an ofnode to a live DT node pointer
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*
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* This cannot be called if the reference contains an offset.
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*
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* @node: Reference containing struct device_node * (possibly invalid)
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* @return pointer to device node (can be NULL)
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*/
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static inline const struct device_node *ofnode_to_np(ofnode node)
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{
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#ifdef OF_CHECKS
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if (!of_live_active())
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return NULL;
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#endif
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return node.np;
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}
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/**
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* ofnode_to_offset() - convert an ofnode to a flat DT offset
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*
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* This cannot be called if the reference contains a node pointer.
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*
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* @node: Reference containing offset (possibly invalid)
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* @return DT offset (can be -1)
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*/
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static inline int ofnode_to_offset(ofnode node)
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{
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#ifdef OF_CHECKS
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if (of_live_active())
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return -1;
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#endif
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return node.of_offset;
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}
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/**
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* ofnode_valid() - check if an ofnode is valid
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*
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* @return true if the reference contains a valid ofnode, false if it is NULL
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*/
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static inline bool ofnode_valid(ofnode node)
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{
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if (of_live_active())
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return node.np != NULL;
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else
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return node.of_offset != -1;
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}
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/**
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* offset_to_ofnode() - convert a DT offset to an ofnode
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*
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* @of_offset: DT offset (either valid, or -1)
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* @return reference to the associated DT offset
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*/
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static inline ofnode offset_to_ofnode(int of_offset)
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{
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ofnode node;
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if (of_live_active())
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node.np = NULL;
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else
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node.of_offset = of_offset;
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return node;
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}
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/**
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* np_to_ofnode() - convert a node pointer to an ofnode
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*
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* @np: Live node pointer (can be NULL)
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* @return reference to the associated node pointer
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*/
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static inline ofnode np_to_ofnode(const struct device_node *np)
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{
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ofnode node;
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node.np = np;
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return node;
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}
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/**
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* ofnode_is_np() - check if a reference is a node pointer
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*
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* This function associated that if there is a valid live tree then all
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* references will use it. This is because using the flat DT when the live tree
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* is valid is not permitted.
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*
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* @node: reference to check (possibly invalid)
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* @return true if the reference is a live node pointer, false if it is a DT
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* offset
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*/
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static inline bool ofnode_is_np(ofnode node)
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{
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#ifdef OF_CHECKS
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/*
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* Check our assumption that flat tree offsets are not used when a
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* live tree is in use.
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*/
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assert(!ofnode_valid(node) ||
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(of_live_active() ? _ofnode_to_np(node)
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: _ofnode_to_np(node)));
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#endif
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return of_live_active() && ofnode_valid(node);
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}
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/**
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* ofnode_equal() - check if two references are equal
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*
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* @return true if equal, else false
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*/
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static inline bool ofnode_equal(ofnode ref1, ofnode ref2)
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{
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/* We only need to compare the contents */
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return ref1.of_offset == ref2.of_offset;
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}
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/**
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* ofnode_null() - Obtain a null ofnode
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*
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* This returns an ofnode which points to no node. It works both with the flat
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* tree and livetree.
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*/
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static inline ofnode ofnode_null(void)
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{
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ofnode node;
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if (of_live_active())
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node.np = NULL;
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else
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node.of_offset = -1;
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return node;
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}
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/**
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* ofnode_read_u32() - Read a 32-bit integer from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @outp: place to put value (if found)
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* @return 0 if OK, -ve on error
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*/
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int ofnode_read_u32(ofnode node, const char *propname, u32 *outp);
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/**
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* ofnode_read_s32() - Read a 32-bit integer from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @outp: place to put value (if found)
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* @return 0 if OK, -ve on error
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*/
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static inline int ofnode_read_s32(ofnode node, const char *propname,
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s32 *out_value)
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{
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return ofnode_read_u32(node, propname, (u32 *)out_value);
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}
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/**
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* ofnode_read_u32_default() - Read a 32-bit integer from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @def: default value to return if the property has no value
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* @return property value, or @def if not found
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*/
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int ofnode_read_u32_default(ofnode ref, const char *propname, u32 def);
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/**
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* ofnode_read_s32_default() - Read a 32-bit integer from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read from
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* @def: default value to return if the property has no value
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* @return property value, or @def if not found
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*/
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int ofnode_read_s32_default(ofnode node, const char *propname, s32 def);
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/**
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* ofnode_read_string() - Read a string from a property
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*
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* @ref: valid node reference to read property from
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* @propname: name of the property to read
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* @return string from property value, or NULL if there is no such property
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*/
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const char *ofnode_read_string(ofnode node, const char *propname);
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/**
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* ofnode_read_u32_array() - Find and read an array of 32 bit integers
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*
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* @node: valid node reference to read property from
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* @propname: name of the property to read
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* @out_values: pointer to return value, modified only if return value is 0
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* @sz: number of array elements to read
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*
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* Search for a property in a device node and read 32-bit value(s) from
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* it. Returns 0 on success, -EINVAL if the property does not exist,
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* -ENODATA if property does not have a value, and -EOVERFLOW if the
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* property data isn't large enough.
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*
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* The out_values is modified only if a valid u32 value can be decoded.
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*/
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int ofnode_read_u32_array(ofnode node, const char *propname,
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u32 *out_values, size_t sz);
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/**
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* ofnode_read_bool() - read a boolean value from a property
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*
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* @node: valid node reference to read property from
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* @propname: name of property to read
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* @return true if property is present (meaning true), false if not present
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*/
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bool ofnode_read_bool(ofnode node, const char *propname);
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/**
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* ofnode_find_subnode() - find a named subnode of a parent node
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*
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* @node: valid reference to parent node
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* @subnode_name: name of subnode to find
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* @return reference to subnode (which can be invalid if there is no such
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* subnode)
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*/
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ofnode ofnode_find_subnode(ofnode node, const char *subnode_name);
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/**
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* ofnode_first_subnode() - find the first subnode of a parent node
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*
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* @node: valid reference to a valid parent node
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* @return reference to the first subnode (which can be invalid if the parent
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* node has no subnodes)
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*/
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ofnode ofnode_first_subnode(ofnode node);
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/**
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* ofnode_next_subnode() - find the next sibling of a subnode
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*
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* @node: valid reference to previous node (sibling)
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* @return reference to the next subnode (which can be invalid if the node
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* has no more siblings)
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*/
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ofnode ofnode_next_subnode(ofnode node);
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/**
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* ofnode_get_name() - get the name of a node
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*
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* @node: valid node to look up
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* @return name or node
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*/
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const char *ofnode_get_name(ofnode node);
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/**
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* ofnode_read_size() - read the size of a property
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*
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* @node: node to check
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* @propname: property to check
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* @return size of property if present, or -EINVAL if not
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*/
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int ofnode_read_size(ofnode node, const char *propname);
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/**
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* ofnode_get_addr_index() - get an address from a node
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*
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* This reads the register address from a node
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*
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* @node: node to read from
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* @index: Index of address to read (0 for first)
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* @return address, or FDT_ADDR_T_NONE if not present or invalid
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*/
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phys_addr_t ofnode_get_addr_index(ofnode node, int index);
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/**
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* ofnode_get_addr() - get an address from a node
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*
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* This reads the register address from a node
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*
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* @node: node to read from
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* @return address, or FDT_ADDR_T_NONE if not present or invalid
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*/
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phys_addr_t ofnode_get_addr(ofnode node);
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/**
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* ofnode_stringlist_search() - find a string in a string list and return index
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*
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* Note that it is possible for this function to succeed on property values
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* that are not NUL-terminated. That's because the function will stop after
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* finding the first occurrence of @string. This can for example happen with
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* small-valued cell properties, such as #address-cells, when searching for
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* the empty string.
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*
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* @node: node to check
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* @propname: name of the property containing the string list
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* @string: string to look up in the string list
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*
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* @return:
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* the index of the string in the list of strings
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* -ENODATA if the property is not found
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* -EINVAL on some other error
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*/
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int ofnode_stringlist_search(ofnode node, const char *propname,
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const char *string);
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/**
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* fdt_stringlist_get() - obtain the string at a given index in a string list
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*
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* Note that this will successfully extract strings from properties with
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* non-NUL-terminated values. For example on small-valued cell properties
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* this function will return the empty string.
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*
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* If non-NULL, the length of the string (on success) or a negative error-code
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* (on failure) will be stored in the integer pointer to by lenp.
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*
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* @node: node to check
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* @propname: name of the property containing the string list
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* @index: index of the string to return
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* @lenp: return location for the string length or an error code on failure
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*
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* @return:
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* length of string, if found or -ve error value if not found
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*/
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int ofnode_read_string_index(ofnode node, const char *propname, int index,
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const char **outp);
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/**
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* ofnode_parse_phandle_with_args() - Find a node pointed by phandle in a list
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*
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* This function is useful to parse lists of phandles and their arguments.
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* Returns 0 on success and fills out_args, on error returns appropriate
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* errno value.
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*
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* Caller is responsible to call of_node_put() on the returned out_args->np
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* pointer.
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*
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* Example:
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*
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* phandle1: node1 {
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* #list-cells = <2>;
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* }
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*
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* phandle2: node2 {
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* #list-cells = <1>;
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* }
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*
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* node3 {
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* list = <&phandle1 1 2 &phandle2 3>;
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* }
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*
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* To get a device_node of the `node2' node you may call this:
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* ofnode_parse_phandle_with_args(node3, "list", "#list-cells", 0, 1, &args);
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*
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* @node: device tree node containing a list
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* @list_name: property name that contains a list
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* @cells_name: property name that specifies phandles' arguments count
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* @cells_count: Cell count to use if @cells_name is NULL
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* @index: index of a phandle to parse out
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* @out_args: optional pointer to output arguments structure (will be filled)
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* @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
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* @list_name does not exist, -EINVAL if a phandle was not found,
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* @cells_name could not be found, the arguments were truncated or there
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* were too many arguments.
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*/
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int ofnode_parse_phandle_with_args(ofnode node, const char *list_name,
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const char *cells_name, int cell_count,
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int index,
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struct ofnode_phandle_args *out_args);
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/**
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* ofnode_path() - find a node by full path
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*
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* @path: Full path to node, e.g. "/bus/spi@1"
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* @return reference to the node found. Use ofnode_valid() to check if it exists
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*/
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ofnode ofnode_path(const char *path);
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/**
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* ofnode_get_chosen_prop() - get the value of a chosen property
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*
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* This looks for a property within the /chosen node and returns its value
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*
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* @propname: Property name to look for
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*/
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const char *ofnode_get_chosen_prop(const char *propname);
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/**
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* ofnode_get_chosen_node() - get the chosen node
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*
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* @return the chosen node if present, else ofnode_null()
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*/
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ofnode ofnode_get_chosen_node(const char *name);
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struct display_timing;
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/**
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* ofnode_decode_display_timing() - decode display timings
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*
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* Decode display timings from the supplied 'display-timings' node.
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* See doc/device-tree-bindings/video/display-timing.txt for binding
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* information.
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*
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* @node 'display-timing' node containing the timing subnodes
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* @index Index number to read (0=first timing subnode)
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* @config Place to put timings
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* @return 0 if OK, -FDT_ERR_NOTFOUND if not found
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*/
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int ofnode_decode_display_timing(ofnode node, int index,
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struct display_timing *config);
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/**
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* ofnode_read_prop()- - read a node property
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*
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* @node: node to read
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* @propname: property to read
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* @lenp: place to put length on success
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* @return pointer to property, or NULL if not found
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*/
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const u32 *ofnode_read_prop(ofnode node, const char *propname, int *lenp);
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/**
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* ofnode_is_available() - check if a node is marked available
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*
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* @node: node to check
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* @return true if node's 'status' property is "okay" (or is missing)
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*/
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bool ofnode_is_available(ofnode node);
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/**
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* ofnode_get_addr_size() - get address and size from a property
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*
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* This does no address translation. It simply reads an property that contains
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* an address and a size value, one after the other.
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*
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* @node: node to read from
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* @propname: property to read
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* @sizep: place to put size value (on success)
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* @return address value, or FDT_ADDR_T_NONE on error
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*/
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phys_addr_t ofnode_get_addr_size(ofnode node, const char *propname,
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phys_size_t *sizep);
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/**
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* ofnode_read_u8_array_ptr() - find an 8-bit array
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*
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* Look up a property in a node and return a pointer to its contents as a
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* byte array of given length. The property must have at least enough data
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* for the array (count bytes). It may have more, but this will be ignored.
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* The data is not copied.
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*
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* @node node to examine
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* @propname name of property to find
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* @sz number of array elements
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|
* @return pointer to byte array if found, or NULL if the property is not
|
|
* found or there is not enough data
|
|
*/
|
|
const uint8_t *ofnode_read_u8_array_ptr(ofnode node, const char *propname,
|
|
size_t sz);
|
|
|
|
/**
|
|
* ofnode_read_pci_addr() - look up a PCI address
|
|
*
|
|
* 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.
|
|
*
|
|
* @node node to examine
|
|
* @type pci address type (FDT_PCI_SPACE_xxx)
|
|
* @propname name of property to find
|
|
* @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 ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
|
|
const char *propname, struct fdt_pci_addr *addr);
|
|
|
|
/**
|
|
* ofnode_read_addr_cells() - Get the number of address cells for a node
|
|
*
|
|
* This walks back up the tree to find the closest #address-cells property
|
|
* which controls the given node.
|
|
*
|
|
* @node: Node to check
|
|
* @return number of address cells this node uses
|
|
*/
|
|
int ofnode_read_addr_cells(ofnode node);
|
|
|
|
/**
|
|
* ofnode_read_size_cells() - Get the number of size cells for a node
|
|
*
|
|
* This walks back up the tree to find the closest #size-cells property
|
|
* which controls the given node.
|
|
*
|
|
* @node: Node to check
|
|
* @return number of size cells this node uses
|
|
*/
|
|
int ofnode_read_size_cells(ofnode node);
|
|
|
|
/**
|
|
* ofnode_pre_reloc() - check if a node should be bound before relocation
|
|
*
|
|
* Device tree nodes can be marked as needing-to-be-bound in the loader stages
|
|
* via special device tree properties.
|
|
*
|
|
* Before relocation this function can be used to check if nodes are required
|
|
* in either SPL or TPL stages.
|
|
*
|
|
* After relocation and jumping into the real U-Boot binary it is possible to
|
|
* determine if a node was bound in one of SPL/TPL stages.
|
|
*
|
|
* There are 3 settings currently in use
|
|
* -
|
|
* - u-boot,dm-pre-reloc: legacy and indicates any of TPL or SPL
|
|
* Existing platforms only use it to indicate nodes needed in
|
|
* SPL. Should probably be replaced by u-boot,dm-spl for
|
|
* new platforms.
|
|
*
|
|
* @node: node to check
|
|
* @eturns true if node is needed in SPL/TL, false otherwise
|
|
*/
|
|
bool ofnode_pre_reloc(ofnode node);
|
|
|
|
#endif
|