115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
/*
|
|
* (C) Copyright 2014
|
|
* Vikas Manocha, ST Micoelectronics, vikas.manocha@st.com.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch-stv0991/hardware.h>
|
|
#include <asm/arch-stv0991/stv0991_cgu.h>
|
|
#include <asm/arch-stv0991/stv0991_gpt.h>
|
|
|
|
static struct stv0991_cgu_regs *const stv0991_cgu_regs = \
|
|
(struct stv0991_cgu_regs *) (CGU_BASE_ADDR);
|
|
|
|
#define READ_TIMER() (readl(&gpt1_regs_ptr->cnt) & GPT_FREE_RUNNING)
|
|
#define GPT_RESOLUTION (CONFIG_STV0991_HZ_CLOCK / CONFIG_STV0991_HZ)
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
#define timestamp gd->arch.tbl
|
|
#define lastdec gd->arch.lastinc
|
|
|
|
int timer_init(void)
|
|
{
|
|
/* Timer1 clock configuration */
|
|
writel(TIMER1_CLK_CFG, &stv0991_cgu_regs->tim_freq);
|
|
writel(readl(&stv0991_cgu_regs->cgu_enable_2) |
|
|
TIMER1_CLK_EN, &stv0991_cgu_regs->cgu_enable_2);
|
|
|
|
/* Stop the timer */
|
|
writel(readl(&gpt1_regs_ptr->cr1) & ~GPT_CR1_CEN, &gpt1_regs_ptr->cr1);
|
|
writel(GPT_PRESCALER_128, &gpt1_regs_ptr->psc);
|
|
/* Configure timer for auto-reload */
|
|
writel(readl(&gpt1_regs_ptr->cr1) | GPT_MODE_AUTO_RELOAD,
|
|
&gpt1_regs_ptr->cr1);
|
|
|
|
/* load value for free running */
|
|
writel(GPT_FREE_RUNNING, &gpt1_regs_ptr->arr);
|
|
|
|
/* start timer */
|
|
writel(readl(&gpt1_regs_ptr->cr1) | GPT_CR1_CEN,
|
|
&gpt1_regs_ptr->cr1);
|
|
|
|
/* Reset the timer */
|
|
lastdec = READ_TIMER();
|
|
timestamp = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* timer without interrupts
|
|
*/
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return (get_timer_masked() / GPT_RESOLUTION) - base;
|
|
}
|
|
|
|
void __udelay(unsigned long usec)
|
|
{
|
|
ulong tmo;
|
|
ulong start = get_timer_masked();
|
|
ulong tenudelcnt = CONFIG_STV0991_HZ_CLOCK / (1000 * 100);
|
|
ulong rndoff;
|
|
|
|
rndoff = (usec % 10) ? 1 : 0;
|
|
|
|
/* tenudelcnt timer tick gives 10 microsecconds delay */
|
|
tmo = ((usec / 10) + rndoff) * tenudelcnt;
|
|
|
|
while ((ulong) (get_timer_masked() - start) < tmo)
|
|
;
|
|
}
|
|
|
|
ulong get_timer_masked(void)
|
|
{
|
|
ulong now = READ_TIMER();
|
|
|
|
if (now >= lastdec) {
|
|
/* normal mode */
|
|
timestamp += now - lastdec;
|
|
} else {
|
|
/* we have an overflow ... */
|
|
timestamp += now + GPT_FREE_RUNNING - lastdec;
|
|
}
|
|
lastdec = now;
|
|
|
|
return timestamp;
|
|
}
|
|
|
|
void udelay_masked(unsigned long usec)
|
|
{
|
|
return udelay(usec);
|
|
}
|
|
|
|
/*
|
|
* 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_STV0991_HZ;
|
|
}
|