mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-26 12:59:43 +09:00
ba3da7348a
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Heiko Schocher <hs@denx.de>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/*
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* (C) Copyright 2000, 2001
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* Wolfgang Denk, DENX Software Engineering, wd@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 <asm/io.h>
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/* ------------------------------------------------------------------------- */
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/*
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* This function is intended for SHORT delays only.
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* It will overflow at around 10 seconds @ 400MHz,
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* or 20 seconds @ 200MHz.
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*/
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unsigned long usec2ticks(unsigned long usec)
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{
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ulong ticks;
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if (usec < 1000) {
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ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
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} else {
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ticks = ((usec / 10) * (get_tbclk() / 100000));
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}
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return (ticks);
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}
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/* ------------------------------------------------------------------------- */
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/*
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* We implement the delay by converting the delay (the number of
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* microseconds to wait) into a number of time base ticks; then we
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* watch the time base until it has incremented by that amount.
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*/
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void __udelay(unsigned long usec)
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{
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ulong ticks = usec2ticks (usec);
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wait_ticks (ticks);
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}
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/* ------------------------------------------------------------------------- */
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#ifndef CONFIG_NAND_SPL
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unsigned long ticks2usec(unsigned long ticks)
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{
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ulong tbclk = get_tbclk();
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/* usec = ticks * 1000000 / tbclk
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* Multiplication would overflow at ~4.2e3 ticks,
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* so we break it up into
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* usec = ( ( ticks * 1000) / tbclk ) * 1000;
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*/
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ticks *= 1000L;
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ticks /= tbclk;
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ticks *= 1000L;
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return ((ulong)ticks);
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}
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#endif
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/* ------------------------------------------------------------------------- */
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int timer_init(void)
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{
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unsigned long temp;
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#if defined(CONFIG_8xx)
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immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
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/* unlock */
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out_be32(&immap->im_sitk.sitk_tbk, KAPWR_KEY);
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#endif
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/* reset */
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asm volatile("li %0,0 ; mttbu %0 ; mttbl %0;"
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: "=&r"(temp) );
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#if defined(CONFIG_8xx)
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/* enable */
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setbits_be16(&immap->im_sit.sit_tbscr, TBSCR_TBE);
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#endif
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return (0);
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}
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/* ------------------------------------------------------------------------- */
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