mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-21 02:33:07 +00:00
c05ed00afb
Move this uncommon header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2002
|
|
* Lineo, Inc. <www.lineo.com>
|
|
* Bernhard Kuhn <bkuhn@lineo.com>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Alex Zuepke <azu@sysgo.de>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <init.h>
|
|
#include <time.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/arch/hardware.h>
|
|
#include <asm/arch/at91_tc.h>
|
|
#include <asm/arch/clk.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* the number of clocks per CONFIG_SYS_HZ */
|
|
#define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ)
|
|
|
|
int timer_init(void)
|
|
{
|
|
at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
|
|
|
|
at91_periph_clk_enable(ATMEL_ID_TC0);
|
|
|
|
writel(0, &tc->bcr);
|
|
writel(AT91_TC_BMR_TC0XC0S_NONE | AT91_TC_BMR_TC1XC1S_NONE |
|
|
AT91_TC_BMR_TC2XC2S_NONE , &tc->bmr);
|
|
|
|
writel(AT91_TC_CCR_CLKDIS, &tc->tc[0].ccr);
|
|
/* set to MCLK/2 and restart the timer
|
|
when the value in TC_RC is reached */
|
|
writel(AT91_TC_CMR_TCCLKS_CLOCK1 | AT91_TC_CMR_CPCTRG, &tc->tc[0].cmr);
|
|
|
|
writel(0xFFFFFFFF, &tc->tc[0].idr); /* disable interrupts */
|
|
writel(TIMER_LOAD_VAL, &tc->tc[0].rc);
|
|
|
|
writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr);
|
|
gd->arch.lastinc = 0;
|
|
gd->arch.tbl = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* timer without interrupts
|
|
*/
|
|
ulong get_timer_raw(void)
|
|
{
|
|
at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
|
|
u32 now;
|
|
|
|
now = readl(&tc->tc[0].cv) & 0x0000ffff;
|
|
|
|
if (now >= gd->arch.lastinc) {
|
|
/* normal mode */
|
|
gd->arch.tbl += now - gd->arch.lastinc;
|
|
} else {
|
|
/* we have an overflow ... */
|
|
gd->arch.tbl += now + TIMER_LOAD_VAL - gd->arch.lastinc;
|
|
}
|
|
gd->arch.lastinc = now;
|
|
|
|
return gd->arch.tbl;
|
|
}
|
|
|
|
static ulong get_timer_masked(void)
|
|
{
|
|
return get_timer_raw()/TIMER_LOAD_VAL;
|
|
}
|
|
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return get_timer_masked() - base;
|
|
}
|
|
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
u32 tmo;
|
|
u32 endtime;
|
|
signed long diff;
|
|
|
|
tmo = CONFIG_SYS_HZ_CLOCK / 1000;
|
|
tmo *= usec;
|
|
tmo /= 1000;
|
|
|
|
endtime = get_timer_raw() + tmo;
|
|
|
|
do {
|
|
u32 now = get_timer_raw();
|
|
diff = endtime - now;
|
|
} while (diff >= 0);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|