cache-shx3.c

Go to the documentation of this file.

/*
 * arch/sh/mm/cache-shx3.c - SH-X3 optimized cache ops
 *
 * Copyright (C) 2010  Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <asm/cache.h>

#define CCR_CACHE_SNM   0x40000     /* Hardware-assisted synonym avoidance */
#define CCR_CACHE_IBE   0x1000000   /* ICBI broadcast */

void __init shx3_cache_init(void)
{
    unsigned int ccr;

    ccr = __raw_readl(CCR);

    /*
     * If we've got cache aliases, resolve them in hardware.
     */
    if (boot_cpu_data.dcache.n_aliases || boot_cpu_data.icache.n_aliases) {
        ccr |= CCR_CACHE_SNM;

        boot_cpu_data.icache.n_aliases = 0;
        boot_cpu_data.dcache.n_aliases = 0;

        pr_info("Enabling hardware synonym avoidance\n");
    }

#ifdef CONFIG_SMP
    /*
     * Broadcast I-cache block invalidations by default.
     */
    ccr |= CCR_CACHE_IBE;
#endif

    writel_uncached(ccr, CCR);
}