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ARM: cache: add dt support for tauros2 cache

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Signed-off-by: Chao Xie <xiechao.mail@gmail.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
This commit is contained in:
Chao Xie 2012-07-31 14:13:14 +08:00 committed by Haojian Zhuang
parent 5cc5815795
commit c2b7e05c75
2 changed files with 51 additions and 1 deletions
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17
Documentation/devicetree/bindings/arm/mrvl/tauros2.txt Normal file
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@ -0,0 +1,17 @@
* Marvell Tauros2 Cache
Required properties:
- compatible : Should be "marvell,tauros2-cache".
- marvell,tauros2-cache-features : Specify the features supported for the
tauros2 cache.
The features including
CACHE_TAUROS2_PREFETCH_ON (1 << 0)
CACHE_TAUROS2_LINEFILL_BURST8 (1 << 1)
The definition can be found at
arch/arm/include/asm/hardware/cache-tauros2.h
Example:
L2: l2-cache {
compatible = "marvell,tauros2-cache";
marvell,tauros2-cache-features = <0x3>;
};

35
arch/arm/mm/cache-tauros2.c
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@ -15,6 +15,8 @@
*/ */
#include <linux/init.h> #include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/cacheflush.h> #include <asm/cacheflush.h>
#include <asm/cp15.h> #include <asm/cp15.h>
#include <asm/cputype.h> #include <asm/cputype.h>
@ -198,7 +200,7 @@ static void enable_extra_feature(unsigned int features)
write_extra_features(u); write_extra_features(u);
} }
void __init tauros2_init(unsigned int features) static void __init tauros2_internal_init(unsigned int features)
{ {
char *mode = NULL; char *mode = NULL;
@ -294,3 +296,34 @@ void __init tauros2_init(unsigned int features)
printk(KERN_INFO "Tauros2: L2 cache support initialised " printk(KERN_INFO "Tauros2: L2 cache support initialised "
"in %s mode.\n", mode); "in %s mode.\n", mode);
} }
#ifdef CONFIG_OF
static const struct of_device_id tauros2_ids[] __initconst = {
{ .compatible = "marvell,tauros2-cache"},
{}
};
#endif
void __init tauros2_init(unsigned int features)
{
#ifdef CONFIG_OF
struct device_node *node;
int ret;
unsigned int f;
node = of_find_matching_node(NULL, tauros2_ids);
if (!node) {
pr_info("Not found marvell,tauros2-cache, disable it\n");
return;
}
ret = of_property_read_u32(node, "marvell,tauros2-cache-features", &f);
if (ret) {
pr_info("Not found marvell,tauros-cache-features property, "
"disable extra features\n");
features = 0;
} else
features = f;
#endif
tauros2_internal_init(features);
}