mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
cba4b1809f
c2dd0d4554
added dcache_enable()
to board_init_r(). This enables d-cache for all ARM boards.
As a result some of the arm boards that are not cache-ready
are broken. Revert this change and allow platform code to
take the decision on d-cache enabling.
Also add some documentation for cache usage in ARM.
Signed-off-by: Aneesh V <aneesh@ti.com>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/*
|
|
* (C) Copyright 2002
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
/* for now: just dummy functions to satisfy the linker */
|
|
|
|
#include <common.h>
|
|
|
|
void __flush_cache(unsigned long start, unsigned long size)
|
|
{
|
|
#if defined(CONFIG_OMAP2420) || defined(CONFIG_ARM1136)
|
|
void arm1136_cache_flush(void);
|
|
|
|
arm1136_cache_flush();
|
|
#endif
|
|
#ifdef CONFIG_ARM926EJS
|
|
/* test and clean, page 2-23 of arm926ejs manual */
|
|
asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
|
|
/* disable write buffer as well (page 2-22) */
|
|
asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
|
|
#endif
|
|
return;
|
|
}
|
|
void flush_cache(unsigned long start, unsigned long size)
|
|
__attribute__((weak, alias("__flush_cache")));
|
|
|
|
/*
|
|
* Default implementation:
|
|
* do a range flush for the entire range
|
|
*/
|
|
void __flush_dcache_all(void)
|
|
{
|
|
flush_cache(0, ~0);
|
|
}
|
|
void flush_dcache_all(void)
|
|
__attribute__((weak, alias("__flush_dcache_all")));
|
|
|
|
|
|
/*
|
|
* Default implementation of enable_caches()
|
|
* Real implementation should be in platform code
|
|
*/
|
|
void __enable_caches(void)
|
|
{
|
|
puts("WARNING: Caches not enabled\n");
|
|
}
|
|
void enable_caches(void)
|
|
__attribute__((weak, alias("__enable_caches")));
|