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/*
* Copyright 2013 Freescale Semiconductor, Inc.
*
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#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);
}
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