diff options
| author | Nathan Lynch <ntl@pobox.com> | 2008-12-10 15:46:04 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-12-21 04:21:14 +0100 |
| commit | e523f723d69cde44e10116d7f49b277da0c6702c (patch) | |
| tree | dc6443159ddfe4965264593c9f493f927e8b1d52 /arch | |
| parent | of/gpio: Implement of_gpio_count() (diff) | |
| download | linux-e523f723d69cde44e10116d7f49b277da0c6702c.tar.xz linux-e523f723d69cde44e10116d7f49b277da0c6702c.zip | |
powerpc: Add of_find_next_cache_node()
We have more than one piece of code that looks up cache nodes manually
using the "l2-cache" property. Add a common helper routine which does
this and handles ePAPR's "next-level-cache" property as well as
powermac.
Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/prom.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 31 |
2 files changed, 34 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h index eb3bd2e1c7f6..6ff04185d2aa 100644 --- a/arch/powerpc/include/asm/prom.h +++ b/arch/powerpc/include/asm/prom.h @@ -253,6 +253,9 @@ extern void kdump_move_device_tree(void); /* CPU OF node matching */ struct device_node *of_get_cpu_node(int cpu, unsigned int *thread); +/* cache lookup */ +struct device_node *of_find_next_cache_node(struct device_node *np); + /* Get the MAC address */ extern const void *of_get_mac_address(struct device_node *np); diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 3a2dc7e6586a..d8266dd61dda 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -1271,6 +1271,37 @@ struct device_node *of_find_node_by_phandle(phandle handle) EXPORT_SYMBOL(of_find_node_by_phandle); /** + * of_find_next_cache_node - Find a node's subsidiary cache + * @np: node of type "cpu" or "cache" + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. Caller should hold a reference + * to np. + */ +struct device_node *of_find_next_cache_node(struct device_node *np) +{ + struct device_node *child; + const phandle *handle; + + handle = of_get_property(np, "l2-cache", NULL); + if (!handle) + handle = of_get_property(np, "next-level-cache", NULL); + + if (handle) + return of_find_node_by_phandle(*handle); + + /* OF on pmac has nodes instead of properties named "l2-cache" + * beneath CPU nodes. + */ + if (!strcmp(np->type, "cpu")) + for_each_child_of_node(np, child) + if (!strcmp(child->type, "cache")) + return child; + + return NULL; +} + +/** * of_find_all_nodes - Get next node in global list * @prev: Previous node or NULL to start iteration * of_node_put() will be called on it |