mirror of
https://github.com/AsahiLinux/u-boot
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e6500f86a6
Move the timer code from interrupts.c into timer.c . Eliminate the installation of timer interrupt handler, which is no longer used. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
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* Scott McNutt <smcnutt@psyent.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/nios2.h>
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#include <asm/types.h>
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#include <asm/io.h>
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struct nios_timer {
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u32 status; /* Timer status reg */
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u32 control; /* Timer control reg */
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u32 periodl; /* Timeout period low */
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u32 periodh; /* Timeout period high */
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u32 snapl; /* Snapshot low */
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u32 snaph; /* Snapshot high */
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};
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/* status register */
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#define NIOS_TIMER_TO (1 << 0) /* Timeout */
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#define NIOS_TIMER_RUN (1 << 1) /* Timer running */
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/* control register */
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#define NIOS_TIMER_ITO (1 << 0) /* Timeout interrupt enable */
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#define NIOS_TIMER_CONT (1 << 1) /* Continuous mode */
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#define NIOS_TIMER_START (1 << 2) /* Start timer */
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#define NIOS_TIMER_STOP (1 << 3) /* Stop timer */
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/*************************************************************************/
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unsigned long notrace timer_read_counter(void)
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{
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struct nios_timer *tmr = (struct nios_timer *)CONFIG_SYS_TIMER_BASE;
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u32 val;
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/* Trigger update */
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writel(0x0, &tmr->snapl);
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/* Read timer value */
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val = readl(&tmr->snapl) & 0xffff;
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val |= (readl(&tmr->snaph) & 0xffff) << 16;
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return ~val;
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}
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int timer_init(void)
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{
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struct nios_timer *tmr = (struct nios_timer *)CONFIG_SYS_TIMER_BASE;
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writel(0, &tmr->status);
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writel(0, &tmr->control);
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writel(NIOS_TIMER_STOP, &tmr->control);
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writel(0xffff, &tmr->periodl);
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writel(0xffff, &tmr->periodh);
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writel(NIOS_TIMER_CONT | NIOS_TIMER_START, &tmr->control);
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return 0;
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}
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