LXR linux/arch/sh/mm/cache-shx3.c

   1/*
   2 * arch/sh/mm/cache-shx3.c - SH-X3 optimized cache ops
   3 *
   4 * Copyright (C) 2010  Paul Mundt
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10#include <linux/init.h>
  11#include <linux/kernel.h>
  12#include <linux/io.h>
  13#include <asm/cache.h>
  14
  15#define CCR_CACHE_SNM   0x40000         /* Hardware-assisted synonym avoidance */
  16#define CCR_CACHE_IBE   0x1000000       /* ICBI broadcast */
  17
  18void __init shx3_cache_init(void)
  19{
  20        unsigned int ccr;
  21
  22        ccr = __raw_readl(SH_CCR);
  23
  24        /*
  25         * If we've got cache aliases, resolve them in hardware.
  26         */
  27        if (boot_cpu_data.dcache.n_aliases || boot_cpu_data.icache.n_aliases) {
  28                ccr |= CCR_CACHE_SNM;
  29
  30                boot_cpu_data.icache.n_aliases = 0;
  31                boot_cpu_data.dcache.n_aliases = 0;
  32
  33                pr_info("Enabling hardware synonym avoidance\n");
  34        }
  35
  36#ifdef CONFIG_SMP
  37        /*
  38         * Broadcast I-cache block invalidations by default.
  39         */
  40        ccr |= CCR_CACHE_IBE;
  41#endif
  42
  43        writel_uncached(ccr, SH_CCR);
  44}
  45