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-rw-r--r--arch/sh/mm/cache-shx3.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/sh/mm/cache-shx3.c b/arch/sh/mm/cache-shx3.c
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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(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, CCR);
44}