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![Grant Likely](/assets/img/avatar_default.png)
The device tree structure is composed of two lists; the 'allnodes' list which is a singly linked list containing every node in the tree, and the child->parent structure where each parent node has a singly linked list of children. All of the data in the allnodes list can be easily reproduced with the parent-child lists, so of_allnodes is actually unnecessary. Remove it entirely which saves a bit of memory and simplifies the data structure quite a lot. Signed-off-by: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <robh@kernel.org> Cc: Gaurav Minocha <gaurav.minocha.os@gmail.com> Cc: Pantelis Antoniou <pantelis@pantelis.antoniou@konsulko.com>
245 lines
5.7 KiB
C
245 lines
5.7 KiB
C
/* pdt.c: OF PROM device tree support code.
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
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* {engebret|bergner}@us.ibm.com
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*
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* Adapted for sparc by David S. Miller davem@davemloft.net
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* Adapted for multiple architectures by Andres Salomon <dilinger@queued.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_pdt.h>
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static struct of_pdt_ops *of_pdt_prom_ops __initdata;
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void __initdata (*of_pdt_build_more)(struct device_node *dp);
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#if defined(CONFIG_SPARC)
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unsigned int of_pdt_unique_id __initdata;
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#define of_pdt_incr_unique_id(p) do { \
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(p)->unique_id = of_pdt_unique_id++; \
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} while (0)
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static char * __init of_pdt_build_full_name(struct device_node *dp)
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{
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int len, ourlen, plen;
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char *n;
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dp->path_component_name = build_path_component(dp);
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plen = strlen(dp->parent->full_name);
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ourlen = strlen(dp->path_component_name);
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len = ourlen + plen + 2;
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n = prom_early_alloc(len);
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strcpy(n, dp->parent->full_name);
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if (!of_node_is_root(dp->parent)) {
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strcpy(n + plen, "/");
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plen++;
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}
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strcpy(n + plen, dp->path_component_name);
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return n;
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}
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#else /* CONFIG_SPARC */
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static inline void of_pdt_incr_unique_id(void *p) { }
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static inline void irq_trans_init(struct device_node *dp) { }
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static char * __init of_pdt_build_full_name(struct device_node *dp)
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{
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static int failsafe_id = 0; /* for generating unique names on failure */
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char *buf;
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int len;
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if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len))
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goto failsafe;
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buf = prom_early_alloc(len + 1);
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if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len))
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goto failsafe;
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return buf;
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failsafe:
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buf = prom_early_alloc(strlen(dp->parent->full_name) +
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strlen(dp->name) + 16);
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sprintf(buf, "%s/%s@unknown%i",
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of_node_is_root(dp->parent) ? "" : dp->parent->full_name,
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dp->name, failsafe_id++);
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pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf);
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return buf;
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}
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#endif /* !CONFIG_SPARC */
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static struct property * __init of_pdt_build_one_prop(phandle node, char *prev,
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char *special_name,
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void *special_val,
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int special_len)
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{
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static struct property *tmp = NULL;
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struct property *p;
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int err;
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if (tmp) {
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p = tmp;
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memset(p, 0, sizeof(*p) + 32);
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tmp = NULL;
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} else {
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p = prom_early_alloc(sizeof(struct property) + 32);
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of_pdt_incr_unique_id(p);
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}
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p->name = (char *) (p + 1);
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if (special_name) {
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strcpy(p->name, special_name);
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p->length = special_len;
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p->value = prom_early_alloc(special_len);
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memcpy(p->value, special_val, special_len);
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} else {
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err = of_pdt_prom_ops->nextprop(node, prev, p->name);
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if (err) {
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tmp = p;
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return NULL;
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}
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p->length = of_pdt_prom_ops->getproplen(node, p->name);
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if (p->length <= 0) {
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p->length = 0;
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} else {
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int len;
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p->value = prom_early_alloc(p->length + 1);
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len = of_pdt_prom_ops->getproperty(node, p->name,
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p->value, p->length);
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if (len <= 0)
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p->length = 0;
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((unsigned char *)p->value)[p->length] = '\0';
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}
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}
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return p;
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}
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static struct property * __init of_pdt_build_prop_list(phandle node)
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{
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struct property *head, *tail;
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head = tail = of_pdt_build_one_prop(node, NULL,
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".node", &node, sizeof(node));
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tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0);
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tail = tail->next;
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while(tail) {
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tail->next = of_pdt_build_one_prop(node, tail->name,
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NULL, NULL, 0);
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tail = tail->next;
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}
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return head;
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}
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static char * __init of_pdt_get_one_property(phandle node, const char *name)
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{
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char *buf = "<NULL>";
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int len;
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len = of_pdt_prom_ops->getproplen(node, name);
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if (len > 0) {
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buf = prom_early_alloc(len);
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len = of_pdt_prom_ops->getproperty(node, name, buf, len);
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}
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return buf;
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}
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static struct device_node * __init of_pdt_create_node(phandle node,
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struct device_node *parent)
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{
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struct device_node *dp;
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if (!node)
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return NULL;
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dp = prom_early_alloc(sizeof(*dp));
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of_node_init(dp);
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of_pdt_incr_unique_id(dp);
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dp->parent = parent;
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dp->name = of_pdt_get_one_property(node, "name");
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dp->type = of_pdt_get_one_property(node, "device_type");
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dp->phandle = node;
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dp->properties = of_pdt_build_prop_list(node);
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irq_trans_init(dp);
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return dp;
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}
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static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
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phandle node)
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{
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struct device_node *ret = NULL, *prev_sibling = NULL;
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struct device_node *dp;
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while (1) {
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dp = of_pdt_create_node(node, parent);
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if (!dp)
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break;
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if (prev_sibling)
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prev_sibling->sibling = dp;
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if (!ret)
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ret = dp;
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prev_sibling = dp;
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dp->full_name = of_pdt_build_full_name(dp);
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dp->child = of_pdt_build_tree(dp, of_pdt_prom_ops->getchild(node));
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if (of_pdt_build_more)
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of_pdt_build_more(dp);
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node = of_pdt_prom_ops->getsibling(node);
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}
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return ret;
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}
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static void * __init kernel_tree_alloc(u64 size, u64 align)
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{
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return prom_early_alloc(size);
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}
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void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
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{
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BUG_ON(!ops);
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of_pdt_prom_ops = ops;
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of_root = of_pdt_create_node(root_node, NULL);
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#if defined(CONFIG_SPARC)
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of_root->path_component_name = "";
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#endif
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of_root->full_name = "/";
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of_root->child = of_pdt_build_tree(of_root,
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of_pdt_prom_ops->getchild(of_root->phandle));
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/* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
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of_alias_scan(kernel_tree_alloc);
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}
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