u-boot/arch/arm/cpu/armv7/cpu.c
Sjoerd Simons 81b0618ddf arm: Turn of d-cache before i-cache
Booting the kernel fails on RK3288 (and probably other rockchip SoCs)
when the i-cache is disabled/flushed before d-cache.

I have not investigated whether this is due to U-Boot hanging or whether
it's very early in the linux boot, but following the approach of the
various rockchip U-Boot forks (first disable d-cache then i-cache) makes
things work.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
2015-09-02 21:28:25 -06:00

84 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);
}