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[J-linux.git] / 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 #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 }
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