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/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/nios2.h>
#include <asm/types.h>
#include <asm/io.h>
struct nios_timer {
u32 status; /* Timer status reg */
u32 control; /* Timer control reg */
u32 periodl; /* Timeout period low */
u32 periodh; /* Timeout period high */
u32 snapl; /* Snapshot low */
u32 snaph; /* Snapshot high */
};
/* status register */
#define NIOS_TIMER_TO (1 << 0) /* Timeout */
#define NIOS_TIMER_RUN (1 << 1) /* Timer running */
/* control register */
#define NIOS_TIMER_ITO (1 << 0) /* Timeout interrupt enable */
#define NIOS_TIMER_CONT (1 << 1) /* Continuous mode */
#define NIOS_TIMER_START (1 << 2) /* Start timer */
#define NIOS_TIMER_STOP (1 << 3) /* Stop timer */
/*************************************************************************/
unsigned long notrace timer_read_counter(void)
{
struct nios_timer *tmr = (struct nios_timer *)CONFIG_SYS_TIMER_BASE;
u32 val;
/* Trigger update */
writel(0x0, &tmr->snapl);
/* Read timer value */
val = readl(&tmr->snapl) & 0xffff;
val |= (readl(&tmr->snaph) & 0xffff) << 16;
return ~val;
}
int timer_init(void)
{
struct nios_timer *tmr = (struct nios_timer *)CONFIG_SYS_TIMER_BASE;
writel(0, &tmr->status);
writel(0, &tmr->control);
writel(NIOS_TIMER_STOP, &tmr->control);
writel(0xffff, &tmr->periodl);
writel(0xffff, &tmr->periodh);
writel(NIOS_TIMER_CONT | NIOS_TIMER_START, &tmr->control);
return 0;
}
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