153 lines
4.0 KiB
C
153 lines
4.0 KiB
C
/*
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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 2002-2004
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* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
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*
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* (C) Copyright 2004
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* Philippe Robin, ARM Ltd. <philippe.robin@arm.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/io.h>
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#define TIMER_CLOCK (CONFIG_SYS_CLK_FREQ / (2 << CONFIG_SYS_PTV))
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#define TIMER_LOAD_VAL 0xffffffff
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/* macro to read the 32 bit timer */
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#define READ_TIMER readl(CONFIG_SYS_TIMERBASE+8) \
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/ (TIMER_CLOCK / CONFIG_SYS_HZ)
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DECLARE_GLOBAL_DATA_PTR;
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#define timestamp gd->arch.tbl
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#define lastdec gd->arch.lastinc
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int timer_init (void)
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{
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int32_t val;
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/* Start the decrementer ticking down from 0xffffffff */
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*((int32_t *) (CONFIG_SYS_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL;
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val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CONFIG_SYS_PTV << MPUTIM_PTV_BIT);
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*((int32_t *) (CONFIG_SYS_TIMERBASE + CNTL_TIMER)) = val;
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/* init the timestamp and lastdec value */
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reset_timer_masked();
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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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ulong tmo, tmp;
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if(usec >= 1000){ /* if "big" number, spread normalization to seconds */
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tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
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tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */
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tmo /= 1000; /* finish normalize. */
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}else{ /* else small number, don't kill it prior to HZ multiply */
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tmo = usec * CONFIG_SYS_HZ;
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tmo /= (1000*1000);
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}
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tmp = get_timer (0); /* get current timestamp */
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if( (tmo + tmp + 1) < tmp ) /* if setting this fordward will roll time stamp */
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reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastdec value */
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else
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tmo += tmp; /* else, set advancing stamp wake up time */
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while (get_timer_masked () < tmo)/* loop till event */
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/*NOP*/;
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}
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void reset_timer_masked (void)
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{
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/* reset time */
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lastdec = READ_TIMER; /* capure current decrementer value time */
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timestamp = 0; /* start "advancing" time stamp from 0 */
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}
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ulong get_timer_masked (void)
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{
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ulong now = READ_TIMER; /* current tick value */
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if (lastdec >= now) { /* normal mode (non roll) */
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/* normal mode */
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timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */
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} else { /* we have overflow of the count down timer */
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/* nts = ts + ld + (TLV - now)
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* ts=old stamp, ld=time that passed before passing through -1
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* (TLV-now) amount of time after passing though -1
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* nts = new "advancing time stamp"...it could also roll and cause problems.
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*/
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timestamp += lastdec + (TIMER_LOAD_VAL / (TIMER_CLOCK /
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CONFIG_SYS_HZ)) - now;
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}
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lastdec = now;
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return timestamp;
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}
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/* waits specified delay value and resets timestamp */
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void udelay_masked (unsigned long usec)
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{
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ulong tmo;
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ulong endtime;
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signed long diff;
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if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
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tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
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tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */
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tmo /= 1000; /* finish normalize. */
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} else { /* else small number, don't kill it prior to HZ multiply */
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tmo = usec * CONFIG_SYS_HZ;
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tmo /= (1000*1000);
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}
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endtime = get_timer_masked () + tmo;
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do {
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ulong now = get_timer_masked ();
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diff = endtime - now;
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} while (diff >= 0);
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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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