u-boot/arch/arm/mach-omap2/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

102 lines
2.3 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2008
* Texas Instruments
*
* Richard Woodruff <r-woodruff2@ti.com>
* Syed Moahmmed Khasim <khasim@ti.com>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
* Alex Zuepke <azu@sysgo.de>
*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/clock.h>
DECLARE_GLOBAL_DATA_PTR;
static struct gptimer *timer_base = (struct gptimer *)CONFIG_SYS_TIMERBASE;
/*
* Nothing really to do with interrupts, just starts up a counter.
*/
#define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
#define TIMER_OVERFLOW_VAL 0xffffffff
#define TIMER_LOAD_VAL 0
int timer_init(void)
{
/* start the counter ticking up, reload value on overflow */
writel(TIMER_LOAD_VAL, &timer_base->tldr);
/* enable timer */
writel((CONFIG_SYS_PTV << 2) | TCLR_PRE | TCLR_AR | TCLR_ST,
&timer_base->tclr);
return 0;
}
/*
* timer without interrupts
*/
ulong get_timer(ulong base)
{
return get_timer_masked() - base;
}
/* delay x useconds */
void __udelay(unsigned long usec)
{
long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
unsigned long now, last = readl(&timer_base->tcrr);
while (tmo > 0) {
now = readl(&timer_base->tcrr);
if (last > now) /* count up timer overflow */
tmo -= TIMER_OVERFLOW_VAL - last + now + 1;
else
tmo -= now - last;
last = now;
}
}
ulong get_timer_masked(void)
{
/* current tick value */
ulong now = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
if (now >= gd->arch.lastinc) { /* normal mode (non roll) */
/* move stamp fordward with absoulte diff ticks */
gd->arch.tbl += (now - gd->arch.lastinc);
} else { /* we have rollover of incrementer */
gd->arch.tbl += ((TIMER_OVERFLOW_VAL / (TIMER_CLOCK /
CONFIG_SYS_HZ)) - gd->arch.lastinc) + now;
}
gd->arch.lastinc = now;
return gd->arch.tbl;
}
/*
* 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;
}