85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
/*
|
|
* (C) Copyright 2008 Texas Insturments
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/*
|
|
* CPU specific code
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <asm/system.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/armv7.h>
|
|
#include <linux/compiler.h>
|
|
|
|
void __weak cpu_cache_initialization(void){}
|
|
|
|
int cleanup_before_linux_select(int flags)
|
|
{
|
|
/*
|
|
* this function is called just before we call linux
|
|
* it prepares the processor for linux
|
|
*
|
|
* we turn off caches etc ...
|
|
*/
|
|
#ifndef CONFIG_SPL_BUILD
|
|
disable_interrupts();
|
|
#endif
|
|
|
|
if (flags & CBL_DISABLE_CACHES) {
|
|
/*
|
|
* turn off D-cache
|
|
* dcache_disable() in turn flushes the d-cache and disables MMU
|
|
*/
|
|
dcache_disable();
|
|
v7_outer_cache_disable();
|
|
|
|
/*
|
|
* After D-cache is flushed and before it is disabled there may
|
|
* be some new valid entries brought into the cache. We are
|
|
* sure that these lines are not dirty and will not affect our
|
|
* execution. (because unwinding the call-stack and setting a
|
|
* bit in CP15 SCTRL is all we did during this. We have not
|
|
* pushed anything on to the stack. Neither have we affected
|
|
* any static data) So just invalidate the entire d-cache again
|
|
* to avoid coherency problems for kernel
|
|
*/
|
|
invalidate_dcache_all();
|
|
|
|
icache_disable();
|
|
invalidate_icache_all();
|
|
} else {
|
|
/*
|
|
* Turn off I-cache and invalidate it
|
|
*/
|
|
icache_disable();
|
|
invalidate_icache_all();
|
|
|
|
flush_dcache_all();
|
|
invalidate_icache_all();
|
|
icache_enable();
|
|
}
|
|
|
|
/*
|
|
* Some CPU need more cache attention before starting the kernel.
|
|
*/
|
|
cpu_cache_initialization();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cleanup_before_linux(void)
|
|
{
|
|
return cleanup_before_linux_select(CBL_ALL);
|
|
}
|