u-boot/arch/m68k/cpu/mcf547x_8x/slicetimer.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

91 lines
2 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2007, 2012 Freescale Semiconductor, Inc.
* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
*/
#include <common.h>
#include <asm/timer.h>
#include <asm/immap.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
static ulong timestamp;
#if defined(CONFIG_SLTTMR)
#ifndef CONFIG_SYS_UDELAY_BASE
# error "uDelay base not defined!"
#endif
#if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK)
# error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!"
#endif
extern void dtimer_intr_setup(void);
void __udelay(unsigned long usec)
{
slt_t *timerp = (slt_t *) (CONFIG_SYS_UDELAY_BASE);
u32 now, freq;
/* 1 us period */
freq = CONFIG_SYS_TIMER_PRESCALER;
/* Disable */
out_be32(&timerp->cr, 0);
out_be32(&timerp->tcnt, usec * freq);
out_be32(&timerp->cr, SLT_CR_TEN);
now = in_be32(&timerp->cnt);
while (now != 0)
now = in_be32(&timerp->cnt);
setbits_be32(&timerp->sr, SLT_SR_ST);
out_be32(&timerp->cr, 0);
}
void dtimer_interrupt(void *not_used)
{
slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE);
/* check for timer interrupt asserted */
if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
setbits_be32(&timerp->sr, SLT_SR_ST);
timestamp++;
return;
}
}
int timer_init(void)
{
slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE);
timestamp = 0;
/* disable timer */
out_be32(&timerp->cr, 0);
out_be32(&timerp->tcnt, 0);
/* clear status */
out_be32(&timerp->sr, SLT_SR_BE | SLT_SR_ST);
/* initialize and enable timer interrupt */
irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
/* Interrupt every ms */
out_be32(&timerp->tcnt, 1000 * CONFIG_SYS_TIMER_PRESCALER);
dtimer_intr_setup();
/* set a period of 1us, set timer mode to restart and
enable timer and interrupt */
out_be32(&timerp->cr, SLT_CR_RUN | SLT_CR_IEN | SLT_CR_TEN);
return 0;
}
ulong get_timer(ulong base)
{
return (timestamp - base);
}
#endif /* CONFIG_SLTTMR */