arch/arm/cpu/arm926ejs/cache.c

/*
 * (C) Copyright 2011
 * Ilya Yanok, EmCraft Systems
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc.
 */
#include <linux/types.h>
#include <common.h>

#ifndef CONFIG_SYS_DCACHE_OFF

#ifndef CONFIG_SYS_CACHELINE_SIZE
#define CONFIG_SYS_CACHELINE_SIZE	32
#endif

void invalidate_dcache_all(void)
{
	asm volatile("mcr p15, 0, %0, c7, c6, 0\n" : : "r"(0));
}

void flush_dcache_all(void)
{
	asm volatile(
		"0:"
		"mrc p15, 0, r15, c7, c14, 3\n"
		"bne 0b\n"
		"mcr p15, 0, %0, c7, c10, 4\n"
		 : : "r"(0) : "memory"
	);
}

static int check_cache_range(unsigned long start, unsigned long stop)
{
	int ok = 1;

	if (start & (CONFIG_SYS_CACHELINE_SIZE - 1))
		ok = 0;

	if (stop & (CONFIG_SYS_CACHELINE_SIZE - 1))
		ok = 0;

	if (!ok)
		debug("CACHE: Misaligned operation at range [%08lx, %08lx]\n",
			start, stop);

	return ok;
}

void invalidate_dcache_range(unsigned long start, unsigned long stop)
{
	if (!check_cache_range(start, stop))
		return;

	while (start < stop) {
		asm volatile("mcr p15, 0, %0, c7, c6, 1\n" : : "r"(start));
		start += CONFIG_SYS_CACHELINE_SIZE;
	}
}

void flush_dcache_range(unsigned long start, unsigned long stop)
{
	if (!check_cache_range(start, stop))
		return;

	while (start < stop) {
		asm volatile("mcr p15, 0, %0, c7, c14, 1\n" : : "r"(start));
		start += CONFIG_SYS_CACHELINE_SIZE;
	}

	asm volatile("mcr p15, 0, %0, c7, c10, 4\n" : : "r"(0));
}

void flush_cache(unsigned long start, unsigned long size)
{
	flush_dcache_range(start, start + size);
}
#else /* #ifndef CONFIG_SYS_DCACHE_OFF */
void invalidate_dcache_all(void)
{
}

void flush_dcache_all(void)
{
}

void invalidate_dcache_range(unsigned long start, unsigned long stop)
{
}

void flush_dcache_range(unsigned long start, unsigned long stop)
{
}

void flush_cache(unsigned long start, unsigned long size)
{
}
#endif /* #ifndef CONFIG_SYS_DCACHE_OFF */

/*
 * Stub implementations for l2 cache operations
 */
void __l2_cache_disable(void) {}

void l2_cache_disable(void)
	__attribute__((weak, alias("__l2_cache_disable")));