--- /dev/null
+/* pdt.c: OF PROM device tree support code.
+ *
+ * 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 by David S. Miller davem@davemloft.net
+ * Adapted for multiple architectures by Andres Salomon <dilinger@queued.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_pdt.h>
+
+static struct of_pdt_ops *of_pdt_prom_ops __initdata;
+
+void __initdata (*of_pdt_build_more)(struct device_node *dp);
+
+#if defined(CONFIG_SPARC)
+unsigned int of_pdt_unique_id __initdata;
+
+#define of_pdt_incr_unique_id(p) do { \
+ (p)->unique_id = of_pdt_unique_id++; \
+} while (0)
+
+static char * __init of_pdt_build_full_name(struct device_node *dp)
+{
+ int len, ourlen, plen;
+ char *n;
+
+ dp->path_component_name = build_path_component(dp);
+
+ plen = strlen(dp->parent->full_name);
+ ourlen = strlen(dp->path_component_name);
+ len = ourlen + plen + 2;
+
+ n = prom_early_alloc(len);
+ strcpy(n, dp->parent->full_name);
+ if (!of_node_is_root(dp->parent)) {
+ strcpy(n + plen, "/");
+ plen++;
+ }
+ strcpy(n + plen, dp->path_component_name);
+
+ return n;
+}
+
+#else /* CONFIG_SPARC */
+
+static inline void of_pdt_incr_unique_id(void *p) { }
+static inline void irq_trans_init(struct device_node *dp) { }
+
+static char * __init of_pdt_build_full_name(struct device_node *dp)
+{
+ static int failsafe_id = 0; /* for generating unique names on failure */
+ char *buf;
+ int len;
+
+ if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len))
+ goto failsafe;
+
+ buf = prom_early_alloc(len + 1);
+ if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len))
+ goto failsafe;
+ return buf;
+
+ failsafe:
+ buf = prom_early_alloc(strlen(dp->parent->full_name) +
+ strlen(dp->name) + 16);
+ sprintf(buf, "%s/%s@unknown%i",
+ of_node_is_root(dp->parent) ? "" : dp->parent->full_name,
+ dp->name, failsafe_id++);
+ pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf);
+ return buf;
+}
+
+#endif /* !CONFIG_SPARC */
+
+static struct property * __init of_pdt_build_one_prop(phandle node, char *prev,
+ char *special_name,
+ void *special_val,
+ int special_len)
+{
+ static struct property *tmp = NULL;
+ struct property *p;
+ int err;
+
+ if (tmp) {
+ p = tmp;
+ memset(p, 0, sizeof(*p) + 32);
+ tmp = NULL;
+ } else {
+ p = prom_early_alloc(sizeof(struct property) + 32);
+ of_pdt_incr_unique_id(p);
+ }
+
+ p->name = (char *) (p + 1);
+ if (special_name) {
+ strcpy(p->name, special_name);
+ p->length = special_len;
+ p->value = prom_early_alloc(special_len);
+ memcpy(p->value, special_val, special_len);
+ } else {
+ err = of_pdt_prom_ops->nextprop(node, prev, p->name);
+ if (err) {
+ tmp = p;
+ return NULL;
+ }
+ p->length = of_pdt_prom_ops->getproplen(node, p->name);
+ if (p->length <= 0) {
+ p->length = 0;
+ } else {
+ int len;
+
+ p->value = prom_early_alloc(p->length + 1);
+ len = of_pdt_prom_ops->getproperty(node, p->name,
+ p->value, p->length);
+ if (len <= 0)
+ p->length = 0;
+ ((unsigned char *)p->value)[p->length] = '\0';
+ }
+ }
+ return p;
+}
+
+static struct property * __init of_pdt_build_prop_list(phandle node)
+{
+ struct property *head, *tail;
+
+ head = tail = of_pdt_build_one_prop(node, NULL,
+ ".node", &node, sizeof(node));
+
+ tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0);
+ tail = tail->next;
+ while(tail) {
+ tail->next = of_pdt_build_one_prop(node, tail->name,
+ NULL, NULL, 0);
+ tail = tail->next;
+ }
+
+ return head;
+}
+
+static char * __init of_pdt_get_one_property(phandle node, const char *name)
+{
+ char *buf = "<NULL>";
+ int len;
+
+ len = of_pdt_prom_ops->getproplen(node, name);
+ if (len > 0) {
+ buf = prom_early_alloc(len);
+ len = of_pdt_prom_ops->getproperty(node, name, buf, len);
+ }
+
+ return buf;
+}
+
+static struct device_node * __init of_pdt_create_node(phandle node,
+ struct device_node *parent)
+{
+ struct device_node *dp;
+
+ if (!node)
+ return NULL;
+
+ dp = prom_early_alloc(sizeof(*dp));
+ of_node_init(dp);
+ of_pdt_incr_unique_id(dp);
+ dp->parent = parent;
+
+ dp->name = of_pdt_get_one_property(node, "name");
+ dp->type = of_pdt_get_one_property(node, "device_type");
+ dp->phandle = node;
+
+ dp->properties = of_pdt_build_prop_list(node);
+
+ irq_trans_init(dp);
+
+ return dp;
+}
+
+static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
+ phandle node)
+{
+ struct device_node *ret = NULL, *prev_sibling = NULL;
+ struct device_node *dp;
+
+ while (1) {
+ dp = of_pdt_create_node(node, parent);
+ if (!dp)
+ break;
+
+ if (prev_sibling)
+ prev_sibling->sibling = dp;
+
+ if (!ret)
+ ret = dp;
+ prev_sibling = dp;
+
+ dp->full_name = of_pdt_build_full_name(dp);
+
+ dp->child = of_pdt_build_tree(dp, of_pdt_prom_ops->getchild(node));
+
+ if (of_pdt_build_more)
+ of_pdt_build_more(dp);
+
+ node = of_pdt_prom_ops->getsibling(node);
+ }
+
+ return ret;
+}
+
+static void * __init kernel_tree_alloc(u64 size, u64 align)
+{
+ return prom_early_alloc(size);
+}
+
+void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
+{
+ BUG_ON(!ops);
+ of_pdt_prom_ops = ops;
+
+ of_root = of_pdt_create_node(root_node, NULL);
+#if defined(CONFIG_SPARC)
+ of_root->path_component_name = "";
+#endif
+ of_root->full_name = "/";
+
+ of_root->child = of_pdt_build_tree(of_root,
+ of_pdt_prom_ops->getchild(of_root->phandle));
+
+ /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
+ of_alias_scan(kernel_tree_alloc);
+}
Code Review / kvmfornfv.git / blobdiff