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https://github.com/brain-hackers/u-boot-brain
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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>
33 lines
885 B
C
33 lines
885 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Processor reset using WDT.
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*
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* Copyright (C) 2012 Dmitry Bondar <bond@inmys.ru>
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* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.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/io.h>
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#include <asm/arch/timer_defs.h>
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#include <asm/arch/hardware.h>
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void reset_cpu(void)
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{
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struct davinci_timer *const wdttimer =
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(struct davinci_timer *)DAVINCI_WDOG_BASE;
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writel(0x08, &wdttimer->tgcr);
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writel(readl(&wdttimer->tgcr) | 0x03, &wdttimer->tgcr);
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writel(0, &wdttimer->tim12);
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writel(0, &wdttimer->tim34);
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writel(0, &wdttimer->prd12);
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writel(0, &wdttimer->prd34);
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writel(readl(&wdttimer->tcr) | 0x40, &wdttimer->tcr);
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writel(readl(&wdttimer->wdtcr) | 0x4000, &wdttimer->wdtcr);
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writel(0xa5c64000, &wdttimer->wdtcr);
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writel(0xda7e4000, &wdttimer->wdtcr);
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writel(0x4000, &wdttimer->wdtcr);
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while (1)
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/*nothing*/;
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}
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