mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 13:14:27 +00:00
6180ea7e66
The interruption support had be removed for ARM architecture and the function get_timer_masked() is no more used except in some the timer.c files. This patch clean each timer.c which implement this function and remove the associated prototype in u-boot-arm.h For timer.c, I don't verify if the weak version of get_timer (in lib/time.c) can be used Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Cirrus Logic EP93xx timer support.
|
|
*
|
|
* Copyright (C) 2009, 2010 Matthias Kaehlcke <matthias@kaehlcke.net>
|
|
*
|
|
* Copyright (C) 2004, 2005
|
|
* Cory T. Tusar, Videon Central, Inc., <ctusar@videon-central.com>
|
|
*
|
|
* Based on the original intr.c Cirrus Logic EP93xx Rev D. interrupt support,
|
|
* author unknown.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <linux/types.h>
|
|
#include <asm/arch/ep93xx.h>
|
|
#include <asm/io.h>
|
|
#include <div64.h>
|
|
|
|
#define TIMER_CLKSEL (1 << 3)
|
|
#define TIMER_ENABLE (1 << 7)
|
|
|
|
#define TIMER_FREQ 508469 /* ticks / second */
|
|
#define TIMER_MAX_VAL 0xFFFFFFFF
|
|
|
|
static struct ep93xx_timer
|
|
{
|
|
unsigned long long ticks;
|
|
unsigned long last_read;
|
|
} timer;
|
|
|
|
static inline unsigned long long usecs_to_ticks(unsigned long usecs)
|
|
{
|
|
unsigned long long ticks = (unsigned long long)usecs * TIMER_FREQ;
|
|
do_div(ticks, 1000 * 1000);
|
|
|
|
return ticks;
|
|
}
|
|
|
|
static inline void read_timer(void)
|
|
{
|
|
struct timer_regs *timer_regs = (struct timer_regs *)TIMER_BASE;
|
|
const unsigned long now = TIMER_MAX_VAL - readl(&timer_regs->timer3.value);
|
|
|
|
if (now >= timer.last_read)
|
|
timer.ticks += now - timer.last_read;
|
|
else
|
|
/* an overflow occurred */
|
|
timer.ticks += TIMER_MAX_VAL - timer.last_read + now;
|
|
|
|
timer.last_read = now;
|
|
}
|
|
|
|
/*
|
|
* Get the number of ticks (in CONFIG_SYS_HZ resolution)
|
|
*/
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
unsigned long long sys_ticks;
|
|
|
|
read_timer();
|
|
|
|
sys_ticks = timer.ticks * CONFIG_SYS_HZ;
|
|
do_div(sys_ticks, TIMER_FREQ);
|
|
|
|
return sys_ticks;
|
|
}
|
|
|
|
unsigned long get_timer(unsigned long base)
|
|
{
|
|
return get_ticks() - base;
|
|
}
|
|
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
unsigned long long target;
|
|
|
|
read_timer();
|
|
|
|
target = timer.ticks + usecs_to_ticks(usec);
|
|
|
|
while (timer.ticks < target)
|
|
read_timer();
|
|
}
|
|
|
|
int timer_init(void)
|
|
{
|
|
struct timer_regs *timer_regs = (struct timer_regs *)TIMER_BASE;
|
|
|
|
/* use timer 3 with 508KHz and free running, not enabled now */
|
|
writel(TIMER_CLKSEL, &timer_regs->timer3.control);
|
|
|
|
/* set initial timer value */
|
|
writel(TIMER_MAX_VAL, &timer_regs->timer3.load);
|
|
|
|
/* Enable the timer */
|
|
writel(TIMER_ENABLE | TIMER_CLKSEL,
|
|
&timer_regs->timer3.control);
|
|
|
|
/* Reset the timer */
|
|
read_timer();
|
|
timer.ticks = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function is derived from PowerPC code (timebase clock frequency).
|
|
* On ARM it returns the number of timer ticks per second.
|
|
*/
|
|
unsigned long get_tbclk(void)
|
|
{
|
|
return CONFIG_SYS_HZ;
|
|
}
|