dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

ARM: cache: add extra feature enable for tauros2 

The extra feature may be used by SOCs are prefetch, burst8,
write buffer coalesce

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 14:13:12 +08:00 committed by Haojian Zhuang
parent fa79b8d6a2
commit 38f2e37724
2 changed files with 31 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/arm/include/asm/hardware/cache-tauros2.h
View File

@ -8,4 +8,7 @@
* warranty of any kind, whether express or implied.
*/
extern void __init tauros2_init(void);
#define CACHE_TAUROS2_PREFETCH_ON (1 << 0)
#define CACHE_TAUROS2_LINEFILL_BURST8 (1 << 1)
extern void __init tauros2_init(unsigned int features);

44
arch/arm/mm/cache-tauros2.c
View File

@ -145,21 +145,6 @@ static inline void __init write_extra_features(u32 u)
__asm__("mcr p15, 1, %0, c15, c1, 0" : : "r" (u));
}
static void __init disable_l2_prefetch(void)
{
u32 u;
/*
* Read the CPU Extra Features register and verify that the
* Disable L2 Prefetch bit is set.
*/
u = read_extra_features();
if (!(u & 0x01000000)) {
printk(KERN_INFO "Tauros2: Disabling L2 prefetch.\n");
write_extra_features(u | 0x01000000);
}
}
static inline int __init cpuid_scheme(void)
{
return !!((processor_id & 0x000f0000) == 0x000f0000);
@ -188,11 +173,36 @@ static inline void __init write_actlr(u32 actlr)
__asm__("mcr p15, 0, %0, c1, c0, 1\n" : : "r" (actlr));
}
void __init tauros2_init(void)
static void enable_extra_feature(unsigned int features)
{
u32 u;
u = read_extra_features();
if (features & CACHE_TAUROS2_PREFETCH_ON)
u &= ~0x01000000;
else
u |= 0x01000000;
printk(KERN_INFO "Tauros2: %s L2 prefetch.\n",
(features & CACHE_TAUROS2_PREFETCH_ON)
? "Enabling" : "Disabling");
if (features & CACHE_TAUROS2_LINEFILL_BURST8)
u |= 0x00100000;
else
u &= ~0x00100000;
printk(KERN_INFO "Tauros2: %s line fill burt8.\n",
(features & CACHE_TAUROS2_LINEFILL_BURST8)
? "Enabling" : "Disabling");
write_extra_features(u);
}
void __init tauros2_init(unsigned int features)
{
char *mode = NULL;
disable_l2_prefetch();
enable_extra_feature(features);
#ifdef CONFIG_CPU_32v5
if ((processor_id & 0xff0f0000) == 0x56050000) {