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/*
* arch/sh/mm/cache-sh2.c
*
* Copyright (C) 2002 Paul Mundt
* Copyright (C) 2008 Yoshinori Sato
*
* Released under the terms of the GNU GPL v2.0.
*/
#include <linux/init.h>
#include <linux/mm.h>
#include <asm/cache.h>
#include <asm/addrspace.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
static void sh2__flush_wback_region(void *start, int size)
{
unsigned long v;
unsigned long begin, end;
begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
& ~(L1_CACHE_BYTES-1);
for (v = begin; v < end; v+=L1_CACHE_BYTES) {
unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0);
int way;
for (way = 0; way < 4; way++) {
unsigned long data = __raw_readl(addr | (way << 12));
if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
data &= ~SH_CACHE_UPDATED;
__raw_writel(data, addr | (way << 12));
}
}
}
}
static void sh2__flush_purge_region(void *start, int size)
{
unsigned long v;
unsigned long begin, end;
begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
& ~(L1_CACHE_BYTES-1);
for (v = begin; v < end; v+=L1_CACHE_BYTES)
__raw_writel((v & CACHE_PHYSADDR_MASK),
CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
}
static void sh2__flush_invalidate_region(void *start, int size)
{
#ifdef CONFIG_CACHE_WRITEBACK
/*
* SH-2 does not support individual line invalidation, only a
* global invalidate.
*/
unsigned long ccr;
unsigned long flags;
local_irq_save(flags);
jump_to_uncached();
ccr = __raw_readl(SH_CCR);
ccr |= CCR_CACHE_INVALIDATE;
__raw_writel(ccr, SH_CCR);
back_to_cached();
local_irq_restore(flags);
#else
unsigned long v;
unsigned long begin, end;
begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
& ~(L1_CACHE_BYTES-1);
for (v = begin; v < end; v+=L1_CACHE_BYTES)
__raw_writel((v & CACHE_PHYSADDR_MASK),
CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
#endif
}
void __init sh2_cache_init(void)
{
__flush_wback_region = sh2__flush_wback_region;
__flush_purge_region = sh2__flush_purge_region;
__flush_invalidate_region = sh2__flush_invalidate_region;
}
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