/* 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); }