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 #include <asm/cacheflush.h> 15 16 #define CCR_CACHE_SNM 0x40000 /* Hardware-assisted synonym avoidance */ 17 #define CCR_CACHE_IBE 0x1000000 /* ICBI broadcast */ 18 19 void __init shx3_cache_init(void) 20 { 21 unsigned int ccr; 22 23 ccr = __raw_readl(SH_CCR); 24 25 /* 26 * If we've got cache aliases, resolve them in hardware. 27 */ 28 if (boot_cpu_data.dcache.n_aliases || boot_cpu_data.icache.n_aliases) { 29 ccr |= CCR_CACHE_SNM; 30 31 boot_cpu_data.icache.n_aliases = 0; 32 boot_cpu_data.dcache.n_aliases = 0; 33 34 pr_info("Enabling hardware synonym avoidance\n"); 35 } 36 37 #ifdef CONFIG_SMP 38 /* 39 * Broadcast I-cache block invalidations by default. 40 */ 41 ccr |= CCR_CACHE_IBE; 42 #endif 43 44 writel_uncached(ccr, SH_CCR); 45 } 46