/* 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); }