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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>
41 lines
938 B
C
41 lines
938 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
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*
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* (C) Copyright 2009
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* Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.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 <asm/io.h>
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#include <asm/arch/imx-regs.h>
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/*
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* Reset the cpu by setting up the watchdog timer and let it time out
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*/
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void reset_cpu(void)
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{
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struct wdog_regs *regs = (struct wdog_regs *)IMX_WDT_BASE;
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/* Disable watchdog and set Time-Out field to 0 */
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writew(0x0000, ®s->wcr);
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/* Write Service Sequence */
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writew(0x5555, ®s->wsr);
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writew(0xAAAA, ®s->wsr);
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/* Enable watchdog */
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writew(WCR_WDE, ®s->wcr);
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while (1);
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/*NOTREACHED*/
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}
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