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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>
28 lines
642 B
C
28 lines
642 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2013 Broadcom Corporation.
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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/sysmap.h>
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#define EN_MASK 0x08000000 /* Enable timer */
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#define SRSTEN_MASK 0x04000000 /* Enable soft reset */
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#define CLKS_SHIFT 20 /* Clock period shift */
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#define LD_SHIFT 0 /* Reload value shift */
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void reset_cpu(void)
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{
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/*
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* Set WD enable, RST enable,
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* 3.9 msec clock period (8), reload value (8*3.9ms)
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*/
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u32 reg = EN_MASK + SRSTEN_MASK + (8 << CLKS_SHIFT) + (8 << LD_SHIFT);
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writel(reg, SECWD2_BASE_ADDR);
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while (1)
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; /* loop forever till reset */
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}
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