1 files changed, 276 insertions, 0 deletions

diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c
new file mode 100644
index 000000000000..28295d0a50f6
--- /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);
+}