dm: core: Add livetree access functions
Add a basic assortment of functions to access the live device tree. These
come from Linux v4.9 and are modified for U-Boot to the minimum extent
possible. While these functions are now very stable in Linux, it will be
possible to merge in fixes if needed.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/of_access.c b/drivers/core/of_access.c
new file mode 100644
index 0000000..94ef3cc
--- /dev/null
+++ b/drivers/core/of_access.c
@@ -0,0 +1,735 @@
+/*
+ * Originally from Linux v4.9
+ * Paul Mackerras August 1996.
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
+ * {engebret|bergner}@us.ibm.com
+ *
+ * Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net
+ *
+ * Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and
+ * Grant Likely.
+ *
+ * Modified for U-Boot
+ * Copyright (c) 2017 Google, Inc
+ *
+ * This file follows drivers/of/base.c with functions in the same order as the
+ * Linux version.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <libfdt.h>
+#include <dm/of_access.h>
+#include <linux/ctype.h>
+#include <linux/err.h>
+#include <linux/ioport.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* list of struct alias_prop aliases */
+LIST_HEAD(aliases_lookup);
+
+/* "/aliaes" node */
+static struct device_node *of_aliases;
+
+/* "/chosen" node */
+static struct device_node *of_chosen;
+
+/* node pointed to by the stdout-path alias */
+static struct device_node *of_stdout;
+
+/* pointer to options given after the alias (separated by :) or NULL if none */
+static const char *of_stdout_options;
+
+/**
+ * struct alias_prop - Alias property in 'aliases' node
+ *
+ * The structure represents one alias property of 'aliases' node as
+ * an entry in aliases_lookup list.
+ *
+ * @link: List node to link the structure in aliases_lookup list
+ * @alias: Alias property name
+ * @np: Pointer to device_node that the alias stands for
+ * @id: Index value from end of alias name
+ * @stem: Alias string without the index
+ */
+struct alias_prop {
+ struct list_head link;
+ const char *alias;
+ struct device_node *np;
+ int id;
+ char stem[0];
+};
+
+int of_n_addr_cells(const struct device_node *np)
+{
+ const __be32 *ip;
+
+ do {
+ if (np->parent)
+ np = np->parent;
+ ip = of_get_property(np, "#address-cells", NULL);
+ if (ip)
+ return be32_to_cpup(ip);
+ } while (np->parent);
+
+ /* No #address-cells property for the root node */
+ return OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
+}
+
+int of_n_size_cells(const struct device_node *np)
+{
+ const __be32 *ip;
+
+ do {
+ if (np->parent)
+ np = np->parent;
+ ip = of_get_property(np, "#size-cells", NULL);
+ if (ip)
+ return be32_to_cpup(ip);
+ } while (np->parent);
+
+ /* No #size-cells property for the root node */
+ return OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
+}
+
+struct property *of_find_property(const struct device_node *np,
+ const char *name, int *lenp)
+{
+ struct property *pp;
+
+ if (!np)
+ return NULL;
+
+ for (pp = np->properties; pp; pp = pp->next) {
+ if (strcmp(pp->name, name) == 0) {
+ if (lenp)
+ *lenp = pp->length;
+ break;
+ }
+ }
+ if (!pp && lenp)
+ *lenp = -FDT_ERR_NOTFOUND;
+
+ return pp;
+}
+
+struct device_node *of_find_all_nodes(struct device_node *prev)
+{
+ struct device_node *np;
+
+ if (!prev) {
+ np = gd->of_root;
+ } else if (prev->child) {
+ np = prev->child;
+ } else {
+ /*
+ * Walk back up looking for a sibling, or the end of the
+ * structure
+ */
+ np = prev;
+ while (np->parent && !np->sibling)
+ np = np->parent;
+ np = np->sibling; /* Might be null at the end of the tree */
+ }
+
+ return np;
+}
+
+const void *of_get_property(const struct device_node *np, const char *name,
+ int *lenp)
+{
+ struct property *pp = of_find_property(np, name, lenp);
+
+ return pp ? pp->value : NULL;
+}
+
+static const char *of_prop_next_string(struct property *prop, const char *cur)
+{
+ const void *curv = cur;
+
+ if (!prop)
+ return NULL;
+
+ if (!cur)
+ return prop->value;
+
+ curv += strlen(cur) + 1;
+ if (curv >= prop->value + prop->length)
+ return NULL;
+
+ return curv;
+}
+
+int of_device_is_compatible(const struct device_node *device,
+ const char *compat, const char *type,
+ const char *name)
+{
+ struct property *prop;
+ const char *cp;
+ int index = 0, score = 0;
+
+ /* Compatible match has highest priority */
+ if (compat && compat[0]) {
+ prop = of_find_property(device, "compatible", NULL);
+ for (cp = of_prop_next_string(prop, NULL); cp;
+ cp = of_prop_next_string(prop, cp), index++) {
+ if (of_compat_cmp(cp, compat, strlen(compat)) == 0) {
+ score = INT_MAX/2 - (index << 2);
+ break;
+ }
+ }
+ if (!score)
+ return 0;
+ }
+
+ /* Matching type is better than matching name */
+ if (type && type[0]) {
+ if (!device->type || of_node_cmp(type, device->type))
+ return 0;
+ score += 2;
+ }
+
+ /* Matching name is a bit better than not */
+ if (name && name[0]) {
+ if (!device->name || of_node_cmp(name, device->name))
+ return 0;
+ score++;
+ }
+
+ return score;
+}
+
+bool of_device_is_available(const struct device_node *device)
+{
+ const char *status;
+ int statlen;
+
+ if (!device)
+ return false;
+
+ status = of_get_property(device, "status", &statlen);
+ if (status == NULL)
+ return true;
+
+ if (statlen > 0) {
+ if (!strcmp(status, "okay"))
+ return true;
+ }
+
+ return false;
+}
+
+struct device_node *of_get_parent(const struct device_node *node)
+{
+ const struct device_node *np;
+
+ if (!node)
+ return NULL;
+
+ np = of_node_get(node->parent);
+
+ return (struct device_node *)np;
+}
+
+static struct device_node *__of_get_next_child(const struct device_node *node,
+ struct device_node *prev)
+{
+ struct device_node *next;
+
+ if (!node)
+ return NULL;
+
+ next = prev ? prev->sibling : node->child;
+ for (; next; next = next->sibling)
+ if (of_node_get(next))
+ break;
+ of_node_put(prev);
+ return next;
+}
+
+#define __for_each_child_of_node(parent, child) \
+ for (child = __of_get_next_child(parent, NULL); child != NULL; \
+ child = __of_get_next_child(parent, child))
+
+static struct device_node *__of_find_node_by_path(struct device_node *parent,
+ const char *path)
+{
+ struct device_node *child;
+ int len;
+
+ len = strcspn(path, "/:");
+ if (!len)
+ return NULL;
+
+ __for_each_child_of_node(parent, child) {
+ const char *name = strrchr(child->full_name, '/');
+
+ name++;
+ if (strncmp(path, name, len) == 0 && (strlen(name) == len))
+ return child;
+ }
+ return NULL;
+}
+
+#define for_each_property_of_node(dn, pp) \
+ for (pp = dn->properties; pp != NULL; pp = pp->next)
+
+struct device_node *of_find_node_opts_by_path(const char *path,
+ const char **opts)
+{
+ struct device_node *np = NULL;
+ struct property *pp;
+ const char *separator = strchr(path, ':');
+
+ if (opts)
+ *opts = separator ? separator + 1 : NULL;
+
+ if (strcmp(path, "/") == 0)
+ return of_node_get(gd->of_root);
+
+ /* The path could begin with an alias */
+ if (*path != '/') {
+ int len;
+ const char *p = separator;
+
+ if (!p)
+ p = strchrnul(path, '/');
+ len = p - path;
+
+ /* of_aliases must not be NULL */
+ if (!of_aliases)
+ return NULL;
+
+ for_each_property_of_node(of_aliases, pp) {
+ if (strlen(pp->name) == len && !strncmp(pp->name, path,
+ len)) {
+ np = of_find_node_by_path(pp->value);
+ break;
+ }
+ }
+ if (!np)
+ return NULL;
+ path = p;
+ }
+
+ /* Step down the tree matching path components */
+ if (!np)
+ np = of_node_get(gd->of_root);
+ while (np && *path == '/') {
+ struct device_node *tmp = np;
+
+ path++; /* Increment past '/' delimiter */
+ np = __of_find_node_by_path(np, path);
+ of_node_put(tmp);
+ path = strchrnul(path, '/');
+ if (separator && separator < path)
+ break;
+ }
+
+ return np;
+}
+
+struct device_node *of_find_compatible_node(struct device_node *from,
+ const char *type, const char *compatible)
+{
+ struct device_node *np;
+
+ for_each_of_allnodes_from(from, np)
+ if (of_device_is_compatible(np, compatible, type, NULL) &&
+ of_node_get(np))
+ break;
+ of_node_put(from);
+
+ return np;
+}
+
+struct device_node *of_find_node_by_phandle(phandle handle)
+{
+ struct device_node *np;
+
+ if (!handle)
+ return NULL;
+
+ for_each_of_allnodes(np)
+ if (np->phandle == handle)
+ break;
+ (void)of_node_get(np);
+
+ return np;
+}
+
+/**
+ * of_find_property_value_of_size() - find property of given size
+ *
+ * Search for a property in a device node and validate the requested size.
+ *
+ * @np: device node from which the property value is to be read.
+ * @propname: name of the property to be searched.
+ * @len: requested length of property value
+ *
+ * @return the property value on success, -EINVAL if the property does not
+ * exist, -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ */
+static void *of_find_property_value_of_size(const struct device_node *np,
+ const char *propname, u32 len)
+{
+ struct property *prop = of_find_property(np, propname, NULL);
+
+ if (!prop)
+ return ERR_PTR(-EINVAL);
+ if (!prop->value)
+ return ERR_PTR(-ENODATA);
+ if (len > prop->length)
+ return ERR_PTR(-EOVERFLOW);
+
+ return prop->value;
+}
+
+int of_read_u32(const struct device_node *np, const char *propname, u32 *outp)
+{
+ const __be32 *val;
+
+ debug("%s: %s: ", __func__, propname);
+ if (!np)
+ return -EINVAL;
+ val = of_find_property_value_of_size(np, propname, sizeof(*outp));
+ if (IS_ERR(val)) {
+ debug("(not found)\n");
+ return PTR_ERR(val);
+ }
+
+ *outp = be32_to_cpup(val);
+ debug("%#x (%d)\n", *outp, *outp);
+
+ return 0;
+}
+
+int of_read_u32_array(const struct device_node *np, const char *propname,
+ u32 *out_values, size_t sz)
+{
+ const __be32 *val;
+
+ debug("%s: %s: ", __func__, propname);
+ val = of_find_property_value_of_size(np, propname,
+ sz * sizeof(*out_values));
+
+ if (IS_ERR(val))
+ return PTR_ERR(val);
+
+ debug("size %zd\n", sz);
+ while (sz--)
+ *out_values++ = be32_to_cpup(val++);
+
+ return 0;
+}
+
+int of_property_match_string(const struct device_node *np, const char *propname,
+ const char *string)
+{
+ const struct property *prop = of_find_property(np, propname, NULL);
+ size_t l;
+ int i;
+ const char *p, *end;
+
+ if (!prop)
+ return -EINVAL;
+ if (!prop->value)
+ return -ENODATA;
+
+ p = prop->value;
+ end = p + prop->length;
+
+ for (i = 0; p < end; i++, p += l) {
+ l = strnlen(p, end - p) + 1;
+ if (p + l > end)
+ return -EILSEQ;
+ debug("comparing %s with %s\n", string, p);
+ if (strcmp(string, p) == 0)
+ return i; /* Found it; return index */
+ }
+ return -ENODATA;
+}
+
+/**
+ * of_property_read_string_helper() - Utility helper for parsing string properties
+ * @np: device node from which the property value is to be read.
+ * @propname: name of the property to be searched.
+ * @out_strs: output array of string pointers.
+ * @sz: number of array elements to read.
+ * @skip: Number of strings to skip over at beginning of list.
+ *
+ * Don't call this function directly. It is a utility helper for the
+ * of_property_read_string*() family of functions.
+ */
+int of_property_read_string_helper(const struct device_node *np,
+ const char *propname, const char **out_strs,
+ size_t sz, int skip)
+{
+ const struct property *prop = of_find_property(np, propname, NULL);
+ int l = 0, i = 0;
+ const char *p, *end;
+
+ if (!prop)
+ return -EINVAL;
+ if (!prop->value)
+ return -ENODATA;
+ p = prop->value;
+ end = p + prop->length;
+
+ for (i = 0; p < end && (!out_strs || i < skip + sz); i++, p += l) {
+ l = strnlen(p, end - p) + 1;
+ if (p + l > end)
+ return -EILSEQ;
+ if (out_strs && i >= skip)
+ *out_strs++ = p;
+ }
+ i -= skip;
+ return i <= 0 ? -ENODATA : i;
+}
+
+static int __of_parse_phandle_with_args(const struct device_node *np,
+ const char *list_name,
+ const char *cells_name,
+ int cell_count, int index,
+ struct of_phandle_args *out_args)
+{
+ const __be32 *list, *list_end;
+ int rc = 0, cur_index = 0;
+ uint32_t count = 0;
+ struct device_node *node = NULL;
+ phandle phandle;
+ int size;
+
+ /* Retrieve the phandle list property */
+ list = of_get_property(np, list_name, &size);
+ if (!list)
+ return -ENOENT;
+ list_end = list + size / sizeof(*list);
+
+ /* Loop over the phandles until all the requested entry is found */
+ while (list < list_end) {
+ rc = -EINVAL;
+ count = 0;
+
+ /*
+ * If phandle is 0, then it is an empty entry with no
+ * arguments. Skip forward to the next entry.
+ */
+ phandle = be32_to_cpup(list++);
+ if (phandle) {
+ /*
+ * Find the provider node and parse the #*-cells
+ * property to determine the argument length.
+ *
+ * This is not needed if the cell count is hard-coded
+ * (i.e. cells_name not set, but cell_count is set),
+ * except when we're going to return the found node
+ * below.
+ */
+ if (cells_name || cur_index == index) {
+ node = of_find_node_by_phandle(phandle);
+ if (!node) {
+ debug("%s: could not find phandle\n",
+ np->full_name);
+ goto err;
+ }
+ }
+
+ if (cells_name) {
+ if (of_read_u32(node, cells_name, &count)) {
+ debug("%s: could not get %s for %s\n",
+ np->full_name, cells_name,
+ node->full_name);
+ goto err;
+ }
+ } else {
+ count = cell_count;
+ }
+
+ /*
+ * Make sure that the arguments actually fit in the
+ * remaining property data length
+ */
+ if (list + count > list_end) {
+ debug("%s: arguments longer than property\n",
+ np->full_name);
+ goto err;
+ }
+ }
+
+ /*
+ * All of the error cases above bail out of the loop, so at
+ * this point, the parsing is successful. If the requested
+ * index matches, then fill the out_args structure and return,
+ * or return -ENOENT for an empty entry.
+ */
+ rc = -ENOENT;
+ if (cur_index == index) {
+ if (!phandle)
+ goto err;
+
+ if (out_args) {
+ int i;
+ if (WARN_ON(count > OF_MAX_PHANDLE_ARGS))
+ count = OF_MAX_PHANDLE_ARGS;
+ out_args->np = node;
+ out_args->args_count = count;
+ for (i = 0; i < count; i++)
+ out_args->args[i] =
+ be32_to_cpup(list++);
+ } else {
+ of_node_put(node);
+ }
+
+ /* Found it! return success */
+ return 0;
+ }
+
+ of_node_put(node);
+ node = NULL;
+ list += count;
+ cur_index++;
+ }
+
+ /*
+ * Unlock node before returning result; will be one of:
+ * -ENOENT : index is for empty phandle
+ * -EINVAL : parsing error on data
+ * [1..n] : Number of phandle (count mode; when index = -1)
+ */
+ rc = index < 0 ? cur_index : -ENOENT;
+ err:
+ if (node)
+ of_node_put(node);
+ return rc;
+}
+
+struct device_node *of_parse_phandle(const struct device_node *np,
+ const char *phandle_name, int index)
+{
+ struct of_phandle_args args;
+
+ if (index < 0)
+ return NULL;
+
+ if (__of_parse_phandle_with_args(np, phandle_name, NULL, 0, index,
+ &args))
+ return NULL;
+
+ return args.np;
+}
+
+int of_parse_phandle_with_args(const struct device_node *np,
+ const char *list_name, const char *cells_name,
+ int index, struct of_phandle_args *out_args)
+{
+ if (index < 0)
+ return -EINVAL;
+
+ return __of_parse_phandle_with_args(np, list_name, cells_name, 0,
+ index, out_args);
+}
+
+static void of_alias_add(struct alias_prop *ap, struct device_node *np,
+ int id, const char *stem, int stem_len)
+{
+ ap->np = np;
+ ap->id = id;
+ strncpy(ap->stem, stem, stem_len);
+ ap->stem[stem_len] = 0;
+ list_add_tail(&ap->link, &aliases_lookup);
+ debug("adding DT alias:%s: stem=%s id=%i node=%s\n",
+ ap->alias, ap->stem, ap->id, of_node_full_name(np));
+}
+
+int of_alias_scan(void)
+{
+ struct property *pp;
+
+ of_aliases = of_find_node_by_path("/aliases");
+ of_chosen = of_find_node_by_path("/chosen");
+ if (of_chosen == NULL)
+ of_chosen = of_find_node_by_path("/chosen@0");
+
+ if (of_chosen) {
+ const char *name;
+
+ name = of_get_property(of_chosen, "stdout-path", NULL);
+ if (name)
+ of_stdout = of_find_node_opts_by_path(name,
+ &of_stdout_options);
+ }
+
+ if (!of_aliases)
+ return 0;
+
+ for_each_property_of_node(of_aliases, pp) {
+ const char *start = pp->name;
+ const char *end = start + strlen(start);
+ struct device_node *np;
+ struct alias_prop *ap;
+ ulong id;
+ int len;
+
+ /* Skip those we do not want to proceed */
+ if (!strcmp(pp->name, "name") ||
+ !strcmp(pp->name, "phandle") ||
+ !strcmp(pp->name, "linux,phandle"))
+ continue;
+
+ np = of_find_node_by_path(pp->value);
+ if (!np)
+ continue;
+
+ /*
+ * walk the alias backwards to extract the id and work out
+ * the 'stem' string
+ */
+ while (isdigit(*(end-1)) && end > start)
+ end--;
+ len = end - start;
+
+ if (strict_strtoul(end, 10, &id) < 0)
+ continue;
+
+ /* Allocate an alias_prop with enough space for the stem */
+ ap = malloc(sizeof(*ap) + len + 1);
+ if (!ap)
+ return -ENOMEM;
+ memset(ap, 0, sizeof(*ap) + len + 1);
+ ap->alias = start;
+ of_alias_add(ap, np, id, start, len);
+ }
+
+ return 0;
+}
+
+int of_alias_get_id(const struct device_node *np, const char *stem)
+{
+ struct alias_prop *app;
+ int id = -ENODEV;
+
+ mutex_lock(&of_mutex);
+ list_for_each_entry(app, &aliases_lookup, link) {
+ if (strcmp(app->stem, stem) != 0)
+ continue;
+
+ if (np == app->np) {
+ id = app->id;
+ break;
+ }
+ }
+ mutex_unlock(&of_mutex);
+
+ return id;
+}
+
+struct device_node *of_get_stdout(void)
+{
+ return of_stdout;
+}