u-boot/arch/arm/cpu/arm926ejs/spear/reset.c
Harald Seiler 35b65dd8ef reset: Remove addr parameter from reset_cpu()
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>
2021-03-02 14:03:02 -05:00

39 lines
818 B
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2009
* Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
*/
#include <common.h>
#include <cpu_func.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <asm/arch/spr_syscntl.h>
#include <linux/delay.h>
void reset_cpu(void)
{
struct syscntl_regs *syscntl_regs_p =
(struct syscntl_regs *)CONFIG_SPEAR_SYSCNTLBASE;
printf("System is going to reboot ...\n");
/*
* This 1 second delay will allow the above message
* to be printed before reset
*/
udelay((1000 * 1000));
/* Going into slow mode before resetting SOC */
writel(0x02, &syscntl_regs_p->scctrl);
/*
* Writing any value to the system status register will
* reset the SoC
*/
writel(0x00, &syscntl_regs_p->scsysstat);
/* system will restart */
while (1)
;
}