u-boot/arch/m68k/lib/time.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

195 lines
4.2 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2003 Josef Baumgartner <josef.baumgartner@telex.de>
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#include <common.h>
#include <asm/timer.h>
#include <asm/immap.h>
#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
static volatile ulong timestamp = 0;
#ifndef CONFIG_SYS_WATCHDOG_FREQ
#define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
#endif
#if defined(CONFIG_MCFTMR)
#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)
{
volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_UDELAY_BASE);
uint start, now, tmp;
while (usec > 0) {
if (usec > 65000)
tmp = 65000;
else
tmp = usec;
usec = usec - tmp;
/* Set up TIMER 3 as timebase clock */
timerp->tmr = DTIM_DTMR_RST_RST;
timerp->tcn = 0;
/* set period to 1 us */
timerp->tmr =
CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | DTIM_DTMR_FRR |
DTIM_DTMR_RST_EN;
start = now = timerp->tcn;
while (now < start + tmp)
now = timerp->tcn;
}
}
void dtimer_interrupt(void *not_used)
{
volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
/* check for timer interrupt asserted */
if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF);
timestamp++;
#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) {
WATCHDOG_RESET ();
}
#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
return;
}
}
int timer_init(void)
{
volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
timestamp = 0;
timerp->tcn = 0;
timerp->trr = 0;
/* Set up TIMER 4 as clock */
timerp->tmr = DTIM_DTMR_RST_RST;
/* initialize and enable timer interrupt */
irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
timerp->tcn = 0;
timerp->trr = 1000; /* Interrupt every ms */
dtimer_intr_setup();
/* set a period of 1us, set timer mode to restart and enable timer and interrupt */
timerp->tmr = CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 |
DTIM_DTMR_FRR | DTIM_DTMR_ORRI | DTIM_DTMR_RST_EN;
return 0;
}
ulong get_timer(ulong base)
{
return (timestamp - base);
}
#endif /* CONFIG_MCFTMR */
#if defined(CONFIG_MCFPIT)
#if !defined(CONFIG_SYS_PIT_BASE)
# error "CONFIG_SYS_PIT_BASE not defined!"
#endif
static unsigned short lastinc;
void __udelay(unsigned long usec)
{
volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_UDELAY_BASE);
uint tmp;
while (usec > 0) {
if (usec > 65000)
tmp = 65000;
else
tmp = usec;
usec = usec - tmp;
/* Set up TIMER 3 as timebase clock */
timerp->pcsr = PIT_PCSR_OVW;
timerp->pmr = 0;
/* set period to 1 us */
timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN;
timerp->pmr = tmp;
while (timerp->pcntr > 0) ;
}
}
void timer_init(void)
{
volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE);
timestamp = 0;
/* Set up TIMER 4 as poll clock */
timerp->pcsr = PIT_PCSR_OVW;
timerp->pmr = lastinc = 0;
timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN;
return 0;
}
ulong get_timer(ulong base)
{
unsigned short now, diff;
volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE);
now = timerp->pcntr;
diff = -(now - lastinc);
timestamp += diff;
lastinc = now;
return timestamp - base;
}
void wait_ticks(unsigned long ticks)
{
u32 start = get_timer(0);
while (get_timer(start) < ticks) ;
}
#endif /* CONFIG_MCFPIT */
/*
* This function is derived from PowerPC code (read timebase as long long).
* On M68K it just returns the timer value.
*/
unsigned long long get_ticks(void)
{
return get_timer(0);
}
unsigned long usec2ticks(unsigned long usec)
{
return get_timer(usec);
}
/*
* This function is derived from PowerPC code (timebase clock frequency).
* On M68K it returns the number of timer ticks per second.
*/
ulong get_tbclk(void)
{
return CONFIG_SYS_HZ;
}