93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
/*
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* (C) Copyright 2007, 2012 Freescale Semiconductor, Inc.
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* TsiChung Liew (Tsi-Chung.Liew@freescale.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/timer.h>
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#include <asm/immap.h>
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#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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static ulong timestamp;
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#if defined(CONFIG_SLTTMR)
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#ifndef CONFIG_SYS_UDELAY_BASE
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# error "uDelay base not defined!"
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#endif
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#if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK)
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# error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!"
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#endif
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extern void dtimer_intr_setup(void);
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void __udelay(unsigned long usec)
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{
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slt_t *timerp = (slt_t *) (CONFIG_SYS_UDELAY_BASE);
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u32 now, freq;
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/* 1 us period */
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freq = CONFIG_SYS_TIMER_PRESCALER;
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/* Disable */
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out_be32(&timerp->cr, 0);
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out_be32(&timerp->tcnt, usec * freq);
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out_be32(&timerp->cr, SLT_CR_TEN);
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now = in_be32(&timerp->cnt);
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while (now != 0)
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now = in_be32(&timerp->cnt);
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setbits_be32(&timerp->sr, SLT_SR_ST);
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out_be32(&timerp->cr, 0);
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}
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void dtimer_interrupt(void *not_used)
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{
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slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE);
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/* check for timer interrupt asserted */
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if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
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setbits_be32(&timerp->sr, SLT_SR_ST);
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timestamp++;
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return;
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}
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}
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int timer_init(void)
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{
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slt_t *timerp = (slt_t *) (CONFIG_SYS_TMR_BASE);
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timestamp = 0;
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/* disable timer */
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out_be32(&timerp->cr, 0);
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out_be32(&timerp->tcnt, 0);
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/* clear status */
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out_be32(&timerp->sr, SLT_SR_BE | SLT_SR_ST);
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/* initialize and enable timer interrupt */
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irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
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/* Interrupt every ms */
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out_be32(&timerp->tcnt, 1000 * CONFIG_SYS_TIMER_PRESCALER);
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dtimer_intr_setup();
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/* set a period of 1us, set timer mode to restart and
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enable timer and interrupt */
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out_be32(&timerp->cr, SLT_CR_RUN | SLT_CR_IEN | SLT_CR_TEN);
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return 0;
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}
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ulong get_timer(ulong base)
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{
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return (timestamp - base);
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}
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#endif /* CONFIG_SLTTMR */
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