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Commit 38f2e377 authored by Chao Xie's avatar Chao Xie Committed by Haojian Zhuang
Browse files

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: default avatarChao Xie <xiechao.mail@gmail.com>
Signed-off-by: default avatarHaojian Zhuang <haojian.zhuang@gmail.com>
parent fa79b8d6

arch/arm/include/asm/hardware/cache-tauros2.h

+4 −1
Original line number Diff line number Diff line
@@ -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);

arch/arm/mm/cache-tauros2.c

+27 −17
Original line number Diff line number Diff line
@@ -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) {