mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-01 00:49:43 +00:00
60d1ea94ea
timer.c used static data and are called before relocation. Move all static variables into global_data structure. Also cleanup timer.c from unused stubs and make it truly use 64 bit tick values. Remove reset_timer_masked() get_timer_masked() reference: arch/arm/cpu/arm926ejs/at91/timer.c Based on Reinhard Meyer <u-boot@emk-elektronik.de>'s patches5dca710a3dcfff263f41Signed-off-by: Po-Yu Chuang <ratbert@faraday-tech.com> Tested-by: Macpaul Lin <macpaul@gmail.com>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/*
|
|
* (C) Copyright 2009 Faraday Technology
|
|
* Po-Yu Chuang <ratbert@faraday-tech.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <div64.h>
|
|
#include <asm/io.h>
|
|
#include <faraday/ftpmu010.h>
|
|
#include <faraday/fttmr010.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
#define TIMER_CLOCK 32768
|
|
#define TIMER_LOAD_VAL 0xffffffff
|
|
|
|
static inline unsigned long long tick_to_time(unsigned long long tick)
|
|
{
|
|
tick *= CONFIG_SYS_HZ;
|
|
do_div(tick, gd->timer_rate_hz);
|
|
|
|
return tick;
|
|
}
|
|
|
|
static inline unsigned long long usec_to_tick(unsigned long long usec)
|
|
{
|
|
usec *= gd->timer_rate_hz;
|
|
do_div(usec, 1000000);
|
|
|
|
return usec;
|
|
}
|
|
|
|
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);
|
|
|
|
/* use 32768Hz oscillator for RTC, WDT, TIMER */
|
|
ftpmu010_32768osc_enable();
|
|
|
|
/* 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);
|
|
cr |= FTTMR010_TM3_CLOCK; /* use external clock */
|
|
cr |= FTTMR010_TM3_ENABLE;
|
|
writel(cr, &tmr->cr);
|
|
|
|
gd->timer_rate_hz = TIMER_CLOCK;
|
|
gd->tbu = gd->tbl = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get the current 64 bit timer tick count
|
|
*/
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
|
|
ulong now = TIMER_LOAD_VAL - readl(&tmr->timer3_counter);
|
|
|
|
/* increment tbu if tbl has rolled over */
|
|
if (now < gd->tbl)
|
|
gd->tbu++;
|
|
gd->tbl = now;
|
|
return (((unsigned long long)gd->tbu) << 32) | gd->tbl;
|
|
}
|
|
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
unsigned long long start;
|
|
ulong tmo;
|
|
|
|
start = get_ticks(); /* get current timestamp */
|
|
tmo = usec_to_tick(usec); /* convert usecs to ticks */
|
|
while ((get_ticks() - start) < tmo)
|
|
; /* loop till time has passed */
|
|
}
|
|
|
|
/*
|
|
* get_timer(base) can be used to check for timeouts or
|
|
* to measure elasped time relative to an event:
|
|
*
|
|
* ulong start_time = get_timer(0) sets start_time to the current
|
|
* time value.
|
|
* get_timer(start_time) returns the time elapsed since then.
|
|
*
|
|
* The time is used in CONFIG_SYS_HZ units!
|
|
*/
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return tick_to_time(get_ticks()) - base;
|
|
}
|
|
|
|
/*
|
|
* Return the number of timer ticks per second.
|
|
*/
|
|
ulong get_tbclk(void)
|
|
{
|
|
return gd->timer_rate_hz;
|
|
}
|