mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/*
|
|
* Copyright 2013 Freescale Semiconductor, Inc.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <div64.h>
|
|
#include <asm/arch/imx-regs.h>
|
|
#include <asm/arch/clock.h>
|
|
|
|
static struct pit_reg *cur_pit = (struct pit_reg *)PIT_BASE_ADDR;
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
#define TIMER_LOAD_VAL 0xffffffff
|
|
|
|
static inline unsigned long long tick_to_time(unsigned long long tick)
|
|
{
|
|
tick *= CONFIG_SYS_HZ;
|
|
do_div(tick, mxc_get_clock(MXC_IPG_CLK));
|
|
|
|
return tick;
|
|
}
|
|
|
|
static inline unsigned long long us_to_tick(unsigned long long usec)
|
|
{
|
|
usec = usec * mxc_get_clock(MXC_IPG_CLK) + 999999;
|
|
do_div(usec, 1000000);
|
|
|
|
return usec;
|
|
}
|
|
|
|
int timer_init(void)
|
|
{
|
|
__raw_writel(0, &cur_pit->mcr);
|
|
|
|
__raw_writel(TIMER_LOAD_VAL, &cur_pit->ldval1);
|
|
__raw_writel(0, &cur_pit->tctrl1);
|
|
__raw_writel(1, &cur_pit->tctrl1);
|
|
|
|
gd->arch.tbl = 0;
|
|
gd->arch.tbu = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long long get_ticks(void)
|
|
{
|
|
ulong now = TIMER_LOAD_VAL - __raw_readl(&cur_pit->cval1);
|
|
|
|
/* increment tbu if tbl has rolled over */
|
|
if (now < gd->arch.tbl)
|
|
gd->arch.tbu++;
|
|
gd->arch.tbl = now;
|
|
|
|
return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
|
|
}
|
|
|
|
ulong get_timer_masked(void)
|
|
{
|
|
return tick_to_time(get_ticks());
|
|
}
|
|
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return get_timer_masked() - base;
|
|
}
|
|
|
|
/* delay x useconds AND preserve advance timstamp value */
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
unsigned long long start;
|
|
ulong tmo;
|
|
|
|
start = get_ticks(); /* get current timestamp */
|
|
tmo = us_to_tick(usec); /* convert usecs to ticks */
|
|
while ((get_ticks() - start) < tmo)
|
|
; /* loop till time has passed */
|
|
}
|
|
|
|
/*
|
|
* 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 mxc_get_clock(MXC_IPG_CLK);
|
|
}
|