cache-sh2.c

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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(CCR);
    ccr |= CCR_CACHE_INVALIDATE;
    __raw_writel(ccr, 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;
}