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https://github.com/AsahiLinux/u-boot
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4098d2061f
Data cache memory needs to be disabled before handing over control to linux kernel. This patch populates the cleanup_before_linux stub. Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/*
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* (C) Copyright 2010,2011
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* Vladimir Khusainov, Emcraft Systems, vlad@emcraft.com
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*
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* (C) Copyright 2015
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* Kamil Lulko, <kamil.lulko@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/armv7m.h>
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/*
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* This is called right before passing control to
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* the Linux kernel point.
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*/
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int cleanup_before_linux(void)
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{
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/*
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* this function is called just before we call linux
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* it prepares the processor for linux
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*
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* disable interrupt and turn off caches etc ...
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*/
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disable_interrupts();
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/*
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* turn off D-cache
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* dcache_disable() in turn flushes the d-cache
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* MPU is still enabled & can't be disabled as the u-boot
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* code might be running in sdram which by default is not
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* executable area.
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*/
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dcache_disable();
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/* invalidate to make sure no cache line gets dirty between
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* dcache flushing and disabling dcache */
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invalidate_dcache_all();
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return 0;
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}
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/*
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* Perform the low-level reset.
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*/
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void reset_cpu(ulong addr)
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{
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/*
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* Perform reset but keep priority group unchanged.
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*/
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writel((V7M_AIRCR_VECTKEY << V7M_AIRCR_VECTKEY_SHIFT)
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| (V7M_SCB->aircr & V7M_AIRCR_PRIGROUP_MSK)
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| V7M_AIRCR_SYSRESET, &V7M_SCB->aircr);
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}
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