-#include "libfdt_env.h"
-
-#include <fdt.h>
-#include <libfdt.h>
-
-#include "libfdt_internal.h"
-
-/**
- * overlay_get_target_phandle - retrieves the target phandle of a fragment
- * @fdto: pointer to the device tree overlay blob
- * @fragment: node offset of the fragment in the overlay
- *
- * overlay_get_target_phandle() retrieves the target phandle of an
- * overlay fragment when that fragment uses a phandle (target
- * property) instead of a path (target-path property).
- *
- * returns:
- * the phandle pointed by the target property
- * 0, if the phandle was not found
- * -1, if the phandle was malformed
- */
-static uint32_t overlay_get_target_phandle(const void *fdto, int fragment)
-{
- const uint32_t *val;
- int len;
-
- val = fdt_getprop(fdto, fragment, "target", &len);
- if (!val)
- return 0;
-
- if ((*val == (uint32_t)-1) || (len != sizeof(*val)))
- return (uint32_t)-1;
-
- return fdt32_to_cpu(*val);
-}
-
-/**
- * overlay_get_target - retrieves the target phandle of a fragment
- * @fdt: Base device tree blob
- * @fdto: Device tree overlay blob
- * @fragment: node offset of the fragment in the overlay
- *
- * overlay_get_target() retrieves the target phandle in the base
- * device tree of a fragment, no matter how the actual targetting is
- * done (through a phandle or a path)
- *
- * returns:
- * the targetted node offset in the base device tree
- * Negative error code on error
- */
-static int overlay_get_target(const void *fdt, const void *fdto,
- int fragment)
-{
- uint32_t phandle;
- const char *path;
-
- /* Try first to do a phandle based lookup */
- phandle = overlay_get_target_phandle(fdto, fragment);
- if (phandle == (uint32_t)-1)
- return -FDT_ERR_BADPHANDLE;
-
- if (phandle)
- return fdt_node_offset_by_phandle(fdt, phandle);
-
- /* And then a path based lookup */
- path = fdt_getprop(fdto, fragment, "target-path", NULL);
- if (!path)
- return -FDT_ERR_NOTFOUND;
-
- return fdt_path_offset(fdt, path);
-}
-
-/**
- * overlay_phandle_add_offset - Increases a phandle by an offset
- * @fdt: Base device tree blob
- * @node: Device tree overlay blob
- * @name: Name of the property to modify (phandle or linux,phandle)
- * @delta: offset to apply
- *
- * overlay_phandle_add_offset() increments a node phandle by a given
- * offset.
- *
- * returns:
- * 0 on success.
- * Negative error code on error
- */
-static int overlay_phandle_add_offset(void *fdt, int node,
- const char *name, uint32_t delta)
-{
- const uint32_t *val;
- uint32_t adj_val;
- int len;
-
- val = fdt_getprop(fdt, node, name, &len);
- if (!val)
- return len;
-
- if (len != sizeof(*val))
- return -FDT_ERR_BADSTRUCTURE;
-
- adj_val = fdt32_to_cpu(*val);
- if ((adj_val + delta) < adj_val)
- return -FDT_ERR_BADPHANDLE;
-
- adj_val += delta;
- return fdt_setprop_inplace_u32(fdt, node, name, adj_val);
-}
-
-/**
- * overlay_adjust_node_phandles - Offsets the phandles of a node
- * @fdto: Device tree overlay blob
- * @node: Offset of the node we want to adjust
- * @delta: Offset to shift the phandles of
- *
- * overlay_adjust_node_phandles() adds a constant to all the phandles
- * of a given node. This is mainly use as part of the overlay
- * application process, when we want to update all the overlay
- * phandles to not conflict with the overlays of the base device tree.
- *
- * returns:
- * 0 on success
- * Negative error code on failure
- */
-static int overlay_adjust_node_phandles(void *fdto, int node,
- uint32_t delta)
-{
- bool found = false;
- int child;
- int ret;
-
- ret = overlay_phandle_add_offset(fdto, node, "phandle", delta);
- if (ret && ret != -FDT_ERR_NOTFOUND)
- return ret;
-
- if (!ret)
- found = true;
-
- ret = overlay_phandle_add_offset(fdto, node, "linux,phandle", delta);
- if (ret && ret != -FDT_ERR_NOTFOUND)
- return ret;
-
- /*
- * If neither phandle nor linux,phandle have been found return
- * an error.
- */
- if (!found && !ret)
- return ret;
-
- fdt_for_each_subnode(fdto, child, node)
- overlay_adjust_node_phandles(fdto, child, delta);
-
- return 0;
-}
-
-/**
- * overlay_adjust_local_phandles - Adjust the phandles of a whole overlay
- * @fdto: Device tree overlay blob
- * @delta: Offset to shift the phandles of
- *
- * overlay_adjust_local_phandles() adds a constant to all the
- * phandles of an overlay. This is mainly use as part of the overlay
- * application process, when we want to update all the overlay
- * phandles to not conflict with the overlays of the base device tree.
- *
- * returns:
- * 0 on success
- * Negative error code on failure
- */
-static int overlay_adjust_local_phandles(void *fdto, uint32_t delta)
-{
- /*
- * Start adjusting the phandles from the overlay root
- */
- return overlay_adjust_node_phandles(fdto, 0, delta);
-}
-
-/**
- * overlay_update_local_node_references - Adjust the overlay references
- * @fdto: Device tree overlay blob
- * @tree_node: Node offset of the node to operate on
- * @fixup_node: Node offset of the matching local fixups node
- * @delta: Offset to shift the phandles of
- *
- * overlay_update_local_nodes_references() update the phandles
- * pointing to a node within the device tree overlay by adding a
- * constant delta.
- *
- * This is mainly used as part of a device tree application process,
- * where you want the device tree overlays phandles to not conflict
- * with the ones from the base device tree before merging them.
- *
- * returns:
- * 0 on success
- * Negative error code on failure
- */
-static int overlay_update_local_node_references(void *fdto,
- int tree_node,
- int fixup_node,
- uint32_t delta)
-{
- int fixup_prop;
- int fixup_child;
- int ret;
-
- fdt_for_each_property_offset(fixup_prop, fdto, fixup_node) {
- const unsigned char *fixup_val, *tree_val;
- const char *name;
- int fixup_len;
- int tree_len;
- int i;
-
- fixup_val = fdt_getprop_by_offset(fdto, fixup_prop,
- &name, &fixup_len);
- if (!fixup_val)
- return fixup_len;
-
- tree_val = fdt_getprop(fdto, tree_node, name, &tree_len);
- if (!tree_val)
- return tree_len;
-
- for (i = 0; i < fixup_len; i += sizeof(uint32_t)) {
- uint32_t adj_val, index;
-
- index = *(uint32_t *)(fixup_val + i);
- index = fdt32_to_cpu(index);
-
- /*
- * phandles to fixup can be unaligned.
- *
- * Use a memcpy for the architectures that do
- * not support unaligned accesses.
- */
- memcpy(&adj_val, tree_val + index, sizeof(uint32_t));
-
- adj_val = fdt32_to_cpu(adj_val);
- adj_val += delta;
- adj_val = cpu_to_fdt32(adj_val);
-
- ret = fdt_setprop_inplace_namelen_partial(fdto,
- tree_node,
- name,
- strlen(name),
- index,
- &adj_val,
- sizeof(adj_val));
- if (ret)
- return ret;
- }
- }
-
- fdt_for_each_subnode(fdto, fixup_child, fixup_node) {
- const char *fixup_child_name = fdt_get_name(fdto, fixup_child,
- NULL);
- int tree_child;
-
- tree_child = fdt_subnode_offset(fdto, tree_node,
- fixup_child_name);
- if (tree_child < 0)
- return tree_child;
-
- ret = overlay_update_local_node_references(fdto,
- tree_child,
- fixup_child,
- delta);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
-/**
- * overlay_update_local_references - Adjust the overlay references
- * @fdto: Device tree overlay blob
- * @delta: Offset to shift the phandles of
- *
- * overlay_update_local_references() update all the phandles pointing
- * to a node within the device tree overlay by adding a constant
- * delta to not conflict with the base overlay.
- *
- * This is mainly used as part of a device tree application process,
- * where you want the device tree overlays phandles to not conflict
- * with the ones from the base device tree before merging them.
- *
- * returns:
- * 0 on success
- * Negative error code on failure
- */
-static int overlay_update_local_references(void *fdto, uint32_t delta)
-{
- int fixups;
-
- fixups = fdt_path_offset(fdto, "/__local_fixups__");
- if (fixups < 0) {
- /* There's no local phandles to adjust, bail out */
- if (fixups == -FDT_ERR_NOTFOUND)
- return 0;
-
- return fixups;
- }
-
- /*
- * Update our local references from the root of the tree
- */
- return overlay_update_local_node_references(fdto, 0, fixups,
- delta);
-}
-
-/**
- * overlay_fixup_one_phandle - Set an overlay phandle to the base one
- * @fdt: Base Device Tree blob
- * @fdto: Device tree overlay blob
- * @symbols_off: Node offset of the symbols node in the base device tree
- * @path: Path to a node holding a phandle in the overlay
- * @path_len: number of path characters to consider
- * @name: Name of the property holding the phandle reference in the overlay
- * @name_len: number of name characters to consider
- * @index: Index in the overlay property where the phandle is stored
- * @label: Label of the node referenced by the phandle
- *
- * overlay_fixup_one_phandle() resolves an overlay phandle pointing to
- * a node in the base device tree.
- *
- * This is part of the device tree overlay application process, when
- * you want all the phandles in the overlay to point to the actual
- * base dt nodes.
- *
- * returns:
- * 0 on success
- * Negative error code on failure
- */
-static int overlay_fixup_one_phandle(void *fdt, void *fdto,
- int symbols_off,
- const char *path, uint32_t path_len,
- const char *name, uint32_t name_len,
- int index, const char *label)
-{
- const char *symbol_path;
- uint32_t phandle;
- int symbol_off, fixup_off;
- int prop_len;
-
- symbol_path = fdt_getprop(fdt, symbols_off, label,
- &prop_len);
- if (!symbol_path)
- return -FDT_ERR_NOTFOUND;
-
- symbol_off = fdt_path_offset(fdt, symbol_path);
- if (symbol_off < 0)
- return symbol_off;
-
- phandle = fdt_get_phandle(fdt, symbol_off);
- if (!phandle)
- return -FDT_ERR_NOTFOUND;
-
- fixup_off = fdt_path_offset_namelen(fdto, path, path_len);
- if (fixup_off < 0)
- return fixup_off;
-
- phandle = cpu_to_fdt32(phandle);
- return fdt_setprop_inplace_namelen_partial(fdto, fixup_off,
- name, name_len, index,
- &phandle, sizeof(phandle));
-};
-
-/**
- * overlay_fixup_phandle - Set an overlay phandle to the base one
- * @fdt: Base Device Tree blob
- * @fdto: Device tree overlay blob
- * @symbols_off: Node offset of the symbols node in the base device tree
- * @property: Property offset in the overlay holding the list of fixups
- *
- * overlay_fixup_phandle() resolves all the overlay phandles pointed
- * to in a __local_fixup__ property, and updates them to match the
- * phandles in use in the base device tree.
- *
- * This is part of the device tree overlay application process, when
- * you want all the phandles in the overlay to point to the actual
- * base dt nodes.
- *
- * returns:
- * 0 on success
- * Negative error code on failure
- */
-static int overlay_fixup_phandle(void *fdt, void *fdto, int symbols_off,
- int property)
-{
- const char *value;
- const char *label;
- int len;
-
- value = fdt_getprop_by_offset(fdto, property,
- &label, &len);
- if (!value)
- return len;
-
- do {
- const char *prop_string = value;
- const char *path, *name;
- uint32_t prop_len = strlen(value);
- uint32_t path_len, name_len;
- char *sep, *endptr;
- int index;
- int ret;
-
- path = prop_string;
- sep = memchr(prop_string, ':', prop_len);
- if (*sep != ':')
- return -FDT_ERR_BADSTRUCTURE;
- path_len = sep - path;
-
- name = sep + 1;
- sep = memchr(name, ':', prop_len);
- if (*sep != ':')
- return -FDT_ERR_BADSTRUCTURE;
- name_len = sep - name;
-
- index = strtoul(sep + 1, &endptr, 10);
- if ((*endptr != '\0') || (endptr <= (sep + 1)))
- return -FDT_ERR_BADSTRUCTURE;
-
- len -= prop_len + 1;
- value += prop_len + 1;
-
- ret = overlay_fixup_one_phandle(fdt, fdto, symbols_off,
- path, path_len, name, name_len,
- index, label);
- if (ret)
- return ret;
- } while (len > 0);
-
- return 0;
-}
-
-/**
- * overlay_fixup_phandles - Resolve the overlay phandles to the base
- * device tree
- * @fdt: Base Device Tree blob
- * @fdto: Device tree overlay blob
- *
- * overlay_fixup_phandles() resolves all the overlay phandles pointing
- * to nodes in the base device tree.
- *
- * This is one of the steps of the device tree overlay application
- * process, when you want all the phandles in the overlay to point to
- * the actual base dt nodes.
- *
- * returns:
- * 0 on success
- * Negative error code on failure
- */
-static int overlay_fixup_phandles(void *fdt, void *fdto)
-{
- int fixups_off, symbols_off;
- int property;
-
- symbols_off = fdt_path_offset(fdt, "/__symbols__");
- fixups_off = fdt_path_offset(fdto, "/__fixups__");
-
- fdt_for_each_property_offset(property, fdto, fixups_off) {
- int ret;
-
- ret = overlay_fixup_phandle(fdt, fdto, symbols_off, property);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
-/**
- * overlay_apply_node - Merge an overlay fragment into the base device tree
- * @fdt: Base Device Tree blob
- * @target: Node offset in the base device tree to apply the fragment to
- * @fdto: Device tree overlay blob
- * @fragment: Node offset in the overlay holding the changes to merge
- *
- * overlay_apply_node() merges an overlay fragment into a target base
- * device tree node pointed.
- *
- * This is part of the final step in the device tree overlay
- * application process, when all the phandles have been adjusted and
- * resolved and you just have to merge overlay into the base device
- * tree.
- *
- * returns:
- * 0 on success
- * Negative error code on failure
- */
-static int overlay_apply_node(void *fdt, int target,
- void *fdto, int fragment)
-{
- int property;
- int node;
-
- fdt_for_each_property_offset(property, fdto, fragment) {
- const char *name;
- const void *prop;
- int prop_len;
- int ret;
-
- prop = fdt_getprop_by_offset(fdto, property, &name,
- &prop_len);
- if (prop_len == -FDT_ERR_NOTFOUND)
- return -FDT_ERR_INTERNAL;
- if (prop_len < 0)
- return prop_len;
-
- ret = fdt_setprop(fdt, target, name, prop, prop_len);
- if (ret)
- return ret;
- }
-
- fdt_for_each_subnode(fdto, node, fragment) {
- const char *name = fdt_get_name(fdto, node, NULL);
- int nnode;
- int ret;
-
- nnode = fdt_add_subnode(fdt, target, name);
- if (nnode == -FDT_ERR_EXISTS)
- nnode = fdt_subnode_offset(fdt, target, name);
-
- if (nnode < 0)
- return nnode;
-
- ret = overlay_apply_node(fdt, nnode, fdto, node);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
-/**
- * overlay_merge - Merge an overlay into its base device tree
- * @fdt: Base Device Tree blob
- * @fdto: Device tree overlay blob
- *
- * overlay_merge() merges an overlay into its base device tree.
- *
- * This is the final step in the device tree overlay application
- * process, when all the phandles have been adjusted and resolved and
- * you just have to merge overlay into the base device tree.
- *
- * returns:
- * 0 on success
- * Negative error code on failure
- */
-static int overlay_merge(void *dt, void *dto)
-{
- int fragment;
-
- fdt_for_each_subnode(dto, fragment, 0) {
- int overlay;
- int target;
- int ret;
-
- target = overlay_get_target(dt, dto, fragment);
- if (target < 0)
- continue;
-
- overlay = fdt_subnode_offset(dto, fragment, "__overlay__");
- if (overlay < 0)
- return overlay;
-
- ret = overlay_apply_node(dt, target, dto, overlay);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
-int fdt_overlay_apply(void *fdt, void *fdto)
-{
- uint32_t delta = fdt_get_max_phandle(fdt) + 1;
- int ret;
-
- FDT_CHECK_HEADER(fdt);
- FDT_CHECK_HEADER(fdto);
-
- ret = overlay_adjust_local_phandles(fdto, delta);
- if (ret)
- goto err;
-
- ret = overlay_update_local_references(fdto, delta);
- if (ret)
- goto err;
-
- ret = overlay_fixup_phandles(fdt, fdto);
- if (ret)
- goto err;
-
- ret = overlay_merge(fdt, fdto);
- if (ret)
- goto err;
-
- /*
- * The overlay has been damaged, erase its magic.
- */
- fdt_set_magic(fdto, ~0);
-
- return 0;
-
-err:
- /*
- * The overlay might have been damaged, erase its magic.
- */
- fdt_set_magic(fdto, ~0);
-
- /*
- * The base device tree might have been damaged, erase its
- * magic.
- */
- fdt_set_magic(fdt, ~0);
-
- return ret;
-}
+#include <linux/libfdt_env.h>
+#include "../../scripts/dtc/libfdt/fdt_overlay.c"
projects / oweals / u-boot.git / blobdiff