mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-27 21:43:45 +00:00
c30b7adbca
These functions do not use driver model but are fairly widely used in U-Boot. But it is not clear that they will use driver model anytime soon, so we don't want to label them as 'legacy'. Move them to a new irq_func.h header file. Avoid the name 'irq.h' since it is widely used in U-Boot already. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com>
193 lines
4.3 KiB
C
193 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2009 Faraday Technology
|
|
* Po-Yu Chuang <ratbert@faraday-tech.com>
|
|
*
|
|
* Copyright (C) 2011 Andes Technology Corporation
|
|
* Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
|
|
* Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
|
|
*/
|
|
#ifndef CONFIG_TIMER
|
|
#include <common.h>
|
|
#include <irq_func.h>
|
|
#include <time.h>
|
|
#include <asm/io.h>
|
|
#include <faraday/fttmr010.h>
|
|
|
|
static ulong timestamp;
|
|
static ulong lastdec;
|
|
|
|
int timer_init(void)
|
|
{
|
|
struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
|
|
unsigned int cr;
|
|
|
|
debug("%s()\n", __func__);
|
|
|
|
/* disable timers */
|
|
writel(0, &tmr->cr);
|
|
|
|
#ifdef CONFIG_FTTMR010_EXT_CLK
|
|
/* use 32768Hz oscillator for RTC, WDT, TIMER */
|
|
ftpmu010_32768osc_enable();
|
|
#endif
|
|
|
|
/* setup timer */
|
|
writel(TIMER_LOAD_VAL, &tmr->timer3_load);
|
|
writel(TIMER_LOAD_VAL, &tmr->timer3_counter);
|
|
writel(0, &tmr->timer3_match1);
|
|
writel(0, &tmr->timer3_match2);
|
|
|
|
/* we don't want timer to issue interrupts */
|
|
writel(FTTMR010_TM3_MATCH1 |
|
|
FTTMR010_TM3_MATCH2 |
|
|
FTTMR010_TM3_OVERFLOW,
|
|
&tmr->interrupt_mask);
|
|
|
|
cr = readl(&tmr->cr);
|
|
#ifdef CONFIG_FTTMR010_EXT_CLK
|
|
cr |= FTTMR010_TM3_CLOCK; /* use external clock */
|
|
#endif
|
|
cr |= FTTMR010_TM3_ENABLE;
|
|
writel(cr, &tmr->cr);
|
|
|
|
/* init the timestamp and lastdec value */
|
|
reset_timer_masked();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* timer without interrupts
|
|
*/
|
|
|
|
/*
|
|
* reset time
|
|
*/
|
|
void reset_timer_masked(void)
|
|
{
|
|
struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
|
|
|
|
/* capure current decrementer value time */
|
|
#ifdef CONFIG_FTTMR010_EXT_CLK
|
|
lastdec = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
|
|
#else
|
|
lastdec = readl(&tmr->timer3_counter) /
|
|
(CONFIG_SYS_CLK_FREQ / 2 / CONFIG_SYS_HZ);
|
|
#endif
|
|
timestamp = 0; /* start "advancing" time stamp from 0 */
|
|
|
|
debug("%s(): lastdec = %lx\n", __func__, lastdec);
|
|
}
|
|
|
|
void reset_timer(void)
|
|
{
|
|
debug("%s()\n", __func__);
|
|
reset_timer_masked();
|
|
}
|
|
|
|
/*
|
|
* return timer ticks
|
|
*/
|
|
ulong get_timer_masked(void)
|
|
{
|
|
struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
|
|
|
|
/* current tick value */
|
|
#ifdef CONFIG_FTTMR010_EXT_CLK
|
|
ulong now = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
|
|
#else
|
|
ulong now = readl(&tmr->timer3_counter) /
|
|
(CONFIG_SYS_CLK_FREQ / 2 / CONFIG_SYS_HZ);
|
|
#endif
|
|
|
|
debug("%s(): now = %lx, lastdec = %lx\n", __func__, now, lastdec);
|
|
|
|
if (lastdec >= now) {
|
|
/*
|
|
* normal mode (non roll)
|
|
* move stamp fordward with absoulte diff ticks
|
|
*/
|
|
timestamp += lastdec - now;
|
|
} else {
|
|
/*
|
|
* we have overflow of the count down timer
|
|
*
|
|
* nts = ts + ld + (TLV - now)
|
|
* ts=old stamp, ld=time that passed before passing through -1
|
|
* (TLV-now) amount of time after passing though -1
|
|
* nts = new "advancing time stamp"...it could also roll and
|
|
* cause problems.
|
|
*/
|
|
timestamp += lastdec + TIMER_LOAD_VAL - now;
|
|
}
|
|
|
|
lastdec = now;
|
|
|
|
debug("%s() returns %lx\n", __func__, timestamp);
|
|
|
|
return timestamp;
|
|
}
|
|
|
|
/*
|
|
* return difference between timer ticks and base
|
|
*/
|
|
ulong get_timer(ulong base)
|
|
{
|
|
debug("%s(%lx)\n", __func__, base);
|
|
return get_timer_masked() - base;
|
|
}
|
|
|
|
void set_timer(ulong t)
|
|
{
|
|
debug("%s(%lx)\n", __func__, t);
|
|
timestamp = t;
|
|
}
|
|
|
|
/* delay x useconds AND preserve advance timestamp value */
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
|
|
|
|
#ifdef CONFIG_FTTMR010_EXT_CLK
|
|
long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
|
|
#else
|
|
long tmo = usec * ((CONFIG_SYS_CLK_FREQ / 2) / 1000) / 1000;
|
|
#endif
|
|
unsigned long now, last = readl(&tmr->timer3_counter);
|
|
|
|
debug("%s(%lu)\n", __func__, usec);
|
|
while (tmo > 0) {
|
|
now = readl(&tmr->timer3_counter);
|
|
if (now > last) /* count down timer overflow */
|
|
tmo -= TIMER_LOAD_VAL + last - now;
|
|
else
|
|
tmo -= last - now;
|
|
last = now;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
debug("%s()\n", __func__);
|
|
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)
|
|
{
|
|
debug("%s()\n", __func__);
|
|
#ifdef CONFIG_FTTMR010_EXT_CLK
|
|
return CONFIG_SYS_HZ;
|
|
#else
|
|
return CONFIG_SYS_CLK_FREQ;
|
|
#endif
|
|
}
|
|
#endif /* CONFIG_TIMER */
|