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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2014, STMicroelectronics - All Rights Reserved
* Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
*/
#include <common.h>
#include <init.h>
#include <time.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>
#include <linux/delay.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
static ulong get_timer_masked(void);
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)
;
}
static 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;
}
/*
* 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;
}
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