tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}