cache.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2019 Stephan Gerhold <stephan@gerhold.net>
*/
#include <common.h>
#include <cpu_func.h>
#include <asm/armv7.h>
#include <asm/pl310.h>
#define PL310_WAY_MASK 0xff
#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
void enable_caches(void)
{
/* Enable D-cache. I-cache is already enabled in start.S */
dcache_enable();
}
#endif
#ifdef CONFIG_SYS_L2_PL310
void v7_outer_cache_disable(void)
{
struct pl310_regs *const pl310 = (struct pl310_regs *)CONFIG_SYS_PL310_BASE;
/*
* Linux expects the L2 cache to be turned off by the bootloader.
* Otherwise, it fails very early (shortly after decompressing the kernel).
*
* On U8500, the L2 cache can be only turned on/off from the secure world.
* Instead, prevent usage of the L2 cache by locking all ways.
* The kernel needs to unlock them to make the L2 cache work again.
*/
writel(PL310_WAY_MASK, &pl310->pl310_lockdown_dbase);
writel(PL310_WAY_MASK, &pl310->pl310_lockdown_ibase);
}
#endif