1 files changed, 276 insertions, 0 deletions
diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c
new file mode 100644
index 00000000000..28295d0a50f
--- /dev/null
+++ b/drivers/of/pdt.c
@@ -0,0 +1,276 @@
+/* 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>
+#include <asm/prom.h>
+
+static struct of_pdt_ops *of_pdt_prom_ops __initdata;
+
+void __initdata (*of_pdt_build_more)(struct device_node *dp,
+		struct device_node ***nextp);
+
+#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 inline const char *of_pdt_node_name(struct device_node *dp)
+{
+	return dp->path_component_name;
+}
+
+#else
+
+static inline void of_pdt_incr_unique_id(void *p) { }
+static inline void irq_trans_init(struct device_node *dp) { }
+
+static inline const char *of_pdt_node_name(struct device_node *dp)
+{
+	return dp->name;
+}
+
+#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 char * __init of_pdt_try_pkg2path(phandle node)
+{
+	char *res, *buf = NULL;
+	int len;
+
+	if (!of_pdt_prom_ops->pkg2path)
+		return NULL;
+
+	if (of_pdt_prom_ops->pkg2path(node, buf, 0, &len))
+		return NULL;
+	buf = prom_early_alloc(len + 1);
+	if (of_pdt_prom_ops->pkg2path(node, buf, len, &len)) {
+		pr_err("%s: package-to-path failed\n", __func__);
+		return NULL;
+	}
+
+	res = strrchr(buf, '/');
+	if (!res) {
+		pr_err("%s: couldn't find / in %s\n", __func__, buf);
+		return NULL;
+	}
+	return res+1;
+}
+
+/*
+ * When fetching the node's name, first try using package-to-path; if
+ * that fails (either because the arch hasn't supplied a PROM callback,
+ * or some other random failure), fall back to just looking at the node's
+ * 'name' property.
+ */
+static char * __init of_pdt_build_name(phandle node)
+{
+	char *buf;
+
+	buf = of_pdt_try_pkg2path(node);
+	if (!buf)
+		buf = of_pdt_get_one_property(node, "name");
+
+	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_pdt_incr_unique_id(dp);
+	dp->parent = parent;
+
+	kref_init(&dp->kref);
+
+	dp->name = of_pdt_build_name(node);
+	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 char * __init of_pdt_build_full_name(struct device_node *dp)
+{
+	int len, ourlen, plen;
+	char *n;
+
+	plen = strlen(dp->parent->full_name);
+	ourlen = strlen(of_pdt_node_name(dp));
+	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, of_pdt_node_name(dp));
+
+	return n;
+}
+
+static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
+						   phandle node,
+						   struct device_node ***nextp)
+{
+	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;
+
+		*(*nextp) = dp;
+		*nextp = &dp->allnext;
+
+#if defined(CONFIG_SPARC)
+		dp->path_component_name = build_path_component(dp);
+#endif
+		dp->full_name = of_pdt_build_full_name(dp);
+
+		dp->child = of_pdt_build_tree(dp,
+				of_pdt_prom_ops->getchild(node), nextp);
+
+		if (of_pdt_build_more)
+			of_pdt_build_more(dp, nextp);
+
+		node = of_pdt_prom_ops->getsibling(node);
+	}
+
+	return ret;
+}
+
+void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
+{
+	struct device_node **nextp;
+
+	BUG_ON(!ops);
+	of_pdt_prom_ops = ops;
+
+	allnodes = of_pdt_create_node(root_node, NULL);
+#if defined(CONFIG_SPARC)
+	allnodes->path_component_name = "";
+#endif
+	allnodes->full_name = "/";
+
+	nextp = &allnodes->allnext;
+	allnodes->child = of_pdt_build_tree(allnodes,
+			of_pdt_prom_ops->getchild(allnodes->phandle), &nextp);
+}