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https://github.com/brain-hackers/u-boot-brain
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b644d3e932
usec2ticks() function has been defined for ARMv8 which will be used by SEC Driver. Signed-off-by: Aneesh Bansal <aneesh.bansal@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com>
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/*
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* (C) Copyright 2013
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* David Feng <fenghua@phytium.com.cn>
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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 <command.h>
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#include <asm/system.h>
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/*
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* Generic timer implementation of get_tbclk()
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*/
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unsigned long get_tbclk(void)
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{
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unsigned long cntfrq;
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asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq));
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return cntfrq;
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}
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/*
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* Generic timer implementation of timer_read_counter()
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*/
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unsigned long timer_read_counter(void)
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{
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unsigned long cntpct;
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#ifdef CONFIG_SYS_FSL_ERRATUM_A008585
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/* This erratum number needs to be confirmed to match ARM document */
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unsigned long temp;
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#endif
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isb();
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asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
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#ifdef CONFIG_SYS_FSL_ERRATUM_A008585
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asm volatile("mrs %0, cntpct_el0" : "=r" (temp));
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while (temp != cntpct) {
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asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
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asm volatile("mrs %0, cntpct_el0" : "=r" (temp));
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}
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#endif
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return cntpct;
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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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return ticks;
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}
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