u-boot/arch/arm/cpu/armv7/vf610/timer.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

89 lines
1.8 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2013 Freescale Semiconductor, Inc.
*/
#include <common.h>
#include <asm/io.h>
#include <div64.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>
static struct pit_reg *cur_pit = (struct pit_reg *)PIT_BASE_ADDR;
DECLARE_GLOBAL_DATA_PTR;
#define TIMER_LOAD_VAL 0xffffffff
static inline unsigned long long tick_to_time(unsigned long long tick)
{
tick *= CONFIG_SYS_HZ;
do_div(tick, mxc_get_clock(MXC_IPG_CLK));
return tick;
}
static inline unsigned long long us_to_tick(unsigned long long usec)
{
usec = usec * mxc_get_clock(MXC_IPG_CLK) + 999999;
do_div(usec, 1000000);
return usec;
}
int timer_init(void)
{
__raw_writel(0, &cur_pit->mcr);
__raw_writel(TIMER_LOAD_VAL, &cur_pit->ldval1);
__raw_writel(0, &cur_pit->tctrl1);
__raw_writel(1, &cur_pit->tctrl1);
gd->arch.tbl = 0;
gd->arch.tbu = 0;
return 0;
}
unsigned long long get_ticks(void)
{
ulong now = TIMER_LOAD_VAL - __raw_readl(&cur_pit->cval1);
/* increment tbu if tbl has rolled over */
if (now < gd->arch.tbl)
gd->arch.tbu++;
gd->arch.tbl = now;
return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
}
ulong get_timer_masked(void)
{
return tick_to_time(get_ticks());
}
ulong get_timer(ulong base)
{
return get_timer_masked() - base;
}
/* delay x useconds AND preserve advance timstamp value */
void __udelay(unsigned long usec)
{
unsigned long long start;
ulong tmo;
start = get_ticks(); /* get current timestamp */
tmo = us_to_tick(usec); /* convert usecs to ticks */
while ((get_ticks() - start) < tmo)
; /* loop till time has passed */
}
/*
* 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 mxc_get_clock(MXC_IPG_CLK);
}