u-boot/arch/arm/cpu/arm920t/imx/timer.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

100 lines
1.9 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
*/
#include <common.h>
#include <cpu_func.h>
#include <time.h>
#if defined (CONFIG_IMX)
#include <asm/arch/imx-regs.h>
#include <linux/delay.h>
int timer_init (void)
{
int i;
/* setup GP Timer 1 */
TCTL1 = TCTL_SWR;
for ( i=0; i<100; i++) TCTL1 = 0; /* We have no udelay by now */
TPRER1 = get_PERCLK1() / 1000000; /* 1 MHz */
TCTL1 |= TCTL_FRR | (1<<1); /* Freerun Mode, PERCLK1 input */
/* Reset the timer */
TCTL1 &= ~TCTL_TEN;
TCTL1 |= TCTL_TEN; /* Enable timer */
return (0);
}
/*
* timer without interrupts
*/
static ulong get_timer_masked (void)
{
return TCN1;
}
ulong get_timer (ulong base)
{
return get_timer_masked() - base;
}
void __udelay(unsigned long usec)
{
ulong endtime = get_timer_masked() + usec;
signed long diff;
do {
ulong now = get_timer_masked ();
diff = endtime - now;
} while (diff >= 0);
}
/*
* This function is derived from PowerPC code (read timebase as long long).
* On ARM it just returns the timer value.
*/
unsigned long long get_ticks(void)
{
return get_timer(0);
}
/*
* This function is derived from PowerPC code (timebase clock frequency).
* On ARM it returns the number of timer ticks per second.
*/
ulong get_tbclk(void)
{
return CONFIG_SYS_HZ;
}
/*
* Reset the cpu by setting up the watchdog timer and let him time out
*/
void reset_cpu(void)
{
/* Disable watchdog and set Time-Out field to 0 */
WCR = 0x00000000;
/* Write Service Sequence */
WSR = 0x00005555;
WSR = 0x0000AAAA;
/* Enable watchdog */
WCR = 0x00000001;
while (1);
/*NOTREACHED*/
}
#endif /* defined (CONFIG_IMX) */