mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-06 10:57:46 +00:00
Merge branch 'devicetree/next' of git://git.secretlab.ca/git/linux-2.6
* 'devicetree/next' of git://git.secretlab.ca/git/linux-2.6: dt: add of_alias_scan and of_alias_get_id
This commit is contained in:
commit
27665ffa22
4 changed files with 141 additions and 2 deletions
|
@ -17,14 +17,39 @@
|
|||
* as published by the Free Software Foundation; either version
|
||||
* 2 of the License, or (at your option) any later version.
|
||||
*/
|
||||
#include <linux/ctype.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/proc_fs.h>
|
||||
|
||||
/**
|
||||
* struct alias_prop - Alias property in 'aliases' node
|
||||
* @link: List node to link the structure in aliases_lookup list
|
||||
* @alias: Alias property name
|
||||
* @np: Pointer to device_node that the alias stands for
|
||||
* @id: Index value from end of alias name
|
||||
* @stem: Alias string without the index
|
||||
*
|
||||
* The structure represents one alias property of 'aliases' node as
|
||||
* an entry in aliases_lookup list.
|
||||
*/
|
||||
struct alias_prop {
|
||||
struct list_head link;
|
||||
const char *alias;
|
||||
struct device_node *np;
|
||||
int id;
|
||||
char stem[0];
|
||||
};
|
||||
|
||||
static LIST_HEAD(aliases_lookup);
|
||||
|
||||
struct device_node *allnodes;
|
||||
struct device_node *of_chosen;
|
||||
struct device_node *of_aliases;
|
||||
|
||||
static DEFINE_MUTEX(of_aliases_mutex);
|
||||
|
||||
/* use when traversing tree through the allnext, child, sibling,
|
||||
* or parent members of struct device_node.
|
||||
|
@ -988,3 +1013,108 @@ void of_detach_node(struct device_node *np)
|
|||
}
|
||||
#endif /* defined(CONFIG_OF_DYNAMIC) */
|
||||
|
||||
static void of_alias_add(struct alias_prop *ap, struct device_node *np,
|
||||
int id, const char *stem, int stem_len)
|
||||
{
|
||||
ap->id = id;
|
||||
ap->np = np;
|
||||
strncpy(ap->stem, stem, stem_len);
|
||||
ap->stem[stem_len] = 0;
|
||||
list_add_tail(&ap->link, &aliases_lookup);
|
||||
pr_debug("adding DT alias:%s: stem=%s id=%i node=%s\n",
|
||||
ap->alias, ap->stem, ap->id, np ? np->full_name : NULL);
|
||||
}
|
||||
|
||||
/**
|
||||
* of_alias_scan() - Scan all properties of 'aliases' node
|
||||
*
|
||||
* The function scans all the properties of 'aliases' node and populate
|
||||
* the global lookup table with the properties. It returns the
|
||||
* number of alias_prop found, or error code in error case.
|
||||
*/
|
||||
__init void of_alias_scan(void)
|
||||
{
|
||||
struct property *pp;
|
||||
|
||||
if (!of_aliases)
|
||||
return;
|
||||
|
||||
for_each_property(pp, of_aliases->properties) {
|
||||
const char *start = pp->name;
|
||||
const char *end = start + strlen(start);
|
||||
struct device_node *np;
|
||||
struct alias_prop *ap;
|
||||
int id, len;
|
||||
|
||||
/* Skip those we do not want to proceed */
|
||||
if (!strcmp(pp->name, "name") ||
|
||||
!strcmp(pp->name, "phandle") ||
|
||||
!strcmp(pp->name, "linux,phandle"))
|
||||
continue;
|
||||
|
||||
np = of_find_node_by_path(pp->value);
|
||||
if (!np)
|
||||
continue;
|
||||
|
||||
/* walk alias backwards to extract the id and 'stem' string */
|
||||
while (isdigit(*(end-1)) && end > start)
|
||||
end--;
|
||||
len = end - start;
|
||||
id = strlen(end) ? simple_strtoul(end, NULL, 10) : -1;
|
||||
|
||||
/* Allocate an alias_prop with enough space for the stem */
|
||||
ap = early_init_dt_alloc_memory_arch(sizeof(*ap) + len + 1, 4);
|
||||
if (!ap)
|
||||
continue;
|
||||
ap->alias = start;
|
||||
of_alias_add(ap, np, id, start, len);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* of_alias_get_id() - Get alias id for the given device_node
|
||||
* @np: Pointer to the given device_node
|
||||
* @stem: Alias stem of the given device_node
|
||||
*
|
||||
* The function travels the lookup table to get alias id for the given
|
||||
* device_node and alias stem. It returns the alias id if find it.
|
||||
* If not, dynamically creates one in the lookup table and returns it,
|
||||
* or returns error code if fail to create.
|
||||
*/
|
||||
int of_alias_get_id(struct device_node *np, const char *stem)
|
||||
{
|
||||
struct alias_prop *app;
|
||||
int id = 0;
|
||||
bool found = false;
|
||||
|
||||
mutex_lock(&of_aliases_mutex);
|
||||
list_for_each_entry(app, &aliases_lookup, link) {
|
||||
if (strcmp(app->stem, stem) != 0)
|
||||
continue;
|
||||
|
||||
if (np == app->np) {
|
||||
found = true;
|
||||
id = app->id;
|
||||
break;
|
||||
}
|
||||
|
||||
if (id <= app->id)
|
||||
id = app->id + 1;
|
||||
}
|
||||
|
||||
/* If an id is not found, then allocate a new one */
|
||||
if (!found) {
|
||||
app = kzalloc(sizeof(*app) + strlen(stem) + 1, 4);
|
||||
if (!app) {
|
||||
id = -ENODEV;
|
||||
goto out;
|
||||
}
|
||||
of_alias_add(app, np, id, stem, strlen(stem));
|
||||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&of_aliases_mutex);
|
||||
|
||||
return id;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_alias_get_id);
|
||||
|
|
|
@ -707,10 +707,12 @@ void __init unflatten_device_tree(void)
|
|||
__unflatten_device_tree(initial_boot_params, &allnodes,
|
||||
early_init_dt_alloc_memory_arch);
|
||||
|
||||
/* Get pointer to OF "/chosen" node for use everywhere */
|
||||
/* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
|
||||
of_chosen = of_find_node_by_path("/chosen");
|
||||
if (of_chosen == NULL)
|
||||
of_chosen = of_find_node_by_path("/chosen@0");
|
||||
of_aliases = of_find_node_by_path("/aliases");
|
||||
of_alias_scan();
|
||||
}
|
||||
|
||||
#endif /* CONFIG_OF_EARLY_FLATTREE */
|
||||
|
|
|
@ -68,6 +68,7 @@ struct device_node {
|
|||
/* Pointer for first entry in chain of all nodes. */
|
||||
extern struct device_node *allnodes;
|
||||
extern struct device_node *of_chosen;
|
||||
extern struct device_node *of_aliases;
|
||||
extern rwlock_t devtree_lock;
|
||||
|
||||
static inline bool of_have_populated_dt(void)
|
||||
|
@ -209,6 +210,9 @@ extern int of_device_is_available(const struct device_node *device);
|
|||
extern const void *of_get_property(const struct device_node *node,
|
||||
const char *name,
|
||||
int *lenp);
|
||||
#define for_each_property(pp, properties) \
|
||||
for (pp = properties; pp != NULL; pp = pp->next)
|
||||
|
||||
extern int of_n_addr_cells(struct device_node *np);
|
||||
extern int of_n_size_cells(struct device_node *np);
|
||||
extern const struct of_device_id *of_match_node(
|
||||
|
@ -221,6 +225,10 @@ extern int of_parse_phandles_with_args(struct device_node *np,
|
|||
const char *list_name, const char *cells_name, int index,
|
||||
struct device_node **out_node, const void **out_args);
|
||||
|
||||
extern void *early_init_dt_alloc_memory_arch(u64 size, u64 align);
|
||||
extern void of_alias_scan(void);
|
||||
extern int of_alias_get_id(struct device_node *np, const char *stem);
|
||||
|
||||
extern int of_machine_is_compatible(const char *compat);
|
||||
|
||||
extern int prom_add_property(struct device_node* np, struct property* prop);
|
||||
|
|
|
@ -97,7 +97,6 @@ extern void early_init_dt_check_for_initrd(unsigned long node);
|
|||
extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
|
||||
int depth, void *data);
|
||||
extern void early_init_dt_add_memory_arch(u64 base, u64 size);
|
||||
extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
|
||||
extern u64 dt_mem_next_cell(int s, __be32 **cellp);
|
||||
|
||||
/*
|
||||
|
|
Loading…
Reference in a new issue