mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
8ce5f84157
Now that all users of device_node.type pointer have been removed in favor of accessor functions, we can remove it. Cc: Frank Rowand <frowand.list@gmail.com> Cc: devicetree@vger.kernel.org Signed-off-by: Rob Herring <robh@kernel.org>
214 lines
4.8 KiB
C
214 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/* 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>
|
|
*/
|
|
|
|
#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;
|
|
|
|
#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)
|
|
{
|
|
return build_path_component(dp);
|
|
}
|
|
|
|
#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 */
|
|
const char *name;
|
|
char path[256];
|
|
char *buf;
|
|
int len;
|
|
|
|
if (!of_pdt_prom_ops->pkg2path(dp->phandle, path, sizeof(path), &len)) {
|
|
name = kbasename(path);
|
|
buf = prom_early_alloc(strlen(name) + 1);
|
|
strcpy(buf, name);
|
|
return buf;
|
|
}
|
|
|
|
name = of_get_property(dp, "name", &len);
|
|
buf = prom_early_alloc(len + 16);
|
|
sprintf(buf, "%s@unknown%i", 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->phandle = node;
|
|
|
|
dp->properties = of_pdt_build_prop_list(node);
|
|
|
|
dp->full_name = of_pdt_build_full_name(dp);
|
|
|
|
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->child = of_pdt_build_tree(dp, of_pdt_prom_ops->getchild(node));
|
|
|
|
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);
|
|
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);
|
|
}
|