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#include <asm/cacheflush.h>
15
16#define CCR_CACHE_SNM	0x40000		/* Hardware-assisted synonym avoidance */
17#define CCR_CACHE_IBE	0x1000000	/* ICBI broadcast */
18
19void __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}