105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
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* (C) Copyright 2009
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* 2N Telekomunikace, <www.2n.cz>
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*
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* (C) Copyright 2003
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* Texas Instruments, <www.ti.com>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
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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 <arm925t.h>
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#include <configs/omap1510.h>
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#include <asm/io.h>
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#define TIMER_LOAD_VAL 0xffffffff
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#define TIMER_CLOCK (CONFIG_SYS_CLK_FREQ / (2 << CONFIG_SYS_PTV))
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static uint32_t timestamp;
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static uint32_t lastdec;
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/* nothing really to do with interrupts, just starts up a counter. */
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int timer_init (void)
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{
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/* Start the decrementer ticking down from 0xffffffff */
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__raw_writel(TIMER_LOAD_VAL, CONFIG_SYS_TIMERBASE + LOAD_TIM);
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__raw_writel(MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE |
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(CONFIG_SYS_PTV << MPUTIM_PTV_BIT),
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CONFIG_SYS_TIMERBASE + CNTL_TIMER);
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/* init the timestamp and lastdec value */
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lastdec = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM) /
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(TIMER_CLOCK / CONFIG_SYS_HZ);
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timestamp = 0; /* start "advancing" time stamp from 0 */
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return 0;
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}
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/*
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* timer without interrupts
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*/
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ulong get_timer (ulong base)
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{
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return get_timer_masked () - base;
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}
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/* delay x useconds AND preserve advance timestamp value */
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void __udelay (unsigned long usec)
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{
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int32_t tmo = usec * (TIMER_CLOCK / 1000) / 1000;
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uint32_t now, last = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
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while (tmo > 0) {
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now = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM);
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if (last < now) /* count down timer underflow */
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tmo -= TIMER_LOAD_VAL - now + last;
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else
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tmo -= last - now;
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last = now;
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}
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}
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ulong get_timer_masked (void)
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{
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uint32_t now = __raw_readl(CONFIG_SYS_TIMERBASE + READ_TIM) /
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(TIMER_CLOCK / CONFIG_SYS_HZ);
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if (lastdec < now) /* count down timer underflow */
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timestamp += TIMER_LOAD_VAL / (TIMER_CLOCK / CONFIG_SYS_HZ) -
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now + lastdec;
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else
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timestamp += lastdec - now;
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lastdec = now;
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return timestamp;
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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ulong get_tbclk (void)
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{
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return CONFIG_SYS_HZ;
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}
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