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https://github.com/AsahiLinux/u-boot
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35b65dd8ef
Historically, the reset_cpu() function had an `addr` parameter which was meant to pass in an address of the reset vector location, where the CPU should reset to. This feature is no longer used anywhere in U-Boot as all reset_cpu() implementations now ignore the passed value. Generic code has been added which always calls reset_cpu() with `0` which means this feature can no longer be used easily anyway. Over time, many implementations seem to have "misunderstood" the existence of this parameter as a way to customize/parameterize the reset (e.g. COLD vs WARM resets). As this is not properly supported, the code will almost always not do what it is intended to (because all call-sites just call reset_cpu() with 0). To avoid confusion and to clean up the codebase from unused left-overs of the past, remove the `addr` parameter entirely. Code which intends to support different kinds of resets should be rewritten as a sysreset driver instead. This transformation was done with the following coccinelle patch: @@ expression argvalue; @@ - reset_cpu(argvalue) + reset_cpu() @@ identifier argname; type argtype; @@ - reset_cpu(argtype argname) + reset_cpu(void) { ... } Signed-off-by: Harald Seiler <hws@denx.de> Reviewed-by: Simon Glass <sjg@chromium.org>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#include <common.h>
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#include <cpu_func.h>
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#include <irq_func.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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icache_disable();
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invalidate_icache_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(void)
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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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