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https://github.com/AsahiLinux/u-boot
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38 lines
1,013 B
C
38 lines
1,013 B
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2019 Stephan Gerhold <stephan@gerhold.net>
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <asm/armv7.h>
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#include <asm/pl310.h>
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#define PL310_WAY_MASK 0xff
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#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
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void enable_caches(void)
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{
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/* Enable D-cache. I-cache is already enabled in start.S */
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dcache_enable();
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}
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#endif
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#ifdef CONFIG_SYS_L2_PL310
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void v7_outer_cache_disable(void)
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{
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struct pl310_regs *const pl310 = (struct pl310_regs *)CONFIG_SYS_PL310_BASE;
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/*
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* Linux expects the L2 cache to be turned off by the bootloader.
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* Otherwise, it fails very early (shortly after decompressing the kernel).
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*
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* On U8500, the L2 cache can be only turned on/off from the secure world.
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* Instead, prevent usage of the L2 cache by locking all ways.
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* The kernel needs to unlock them to make the L2 cache work again.
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*/
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writel(PL310_WAY_MASK, &pl310->pl310_lockdown_dbase);
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writel(PL310_WAY_MASK, &pl310->pl310_lockdown_ibase);
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}
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#endif
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