/*
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* Copyright 2013 Freescale Semiconductor, Inc.
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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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#include <div64.h>
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#include <asm/arch/imx-regs.h>
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#include <asm/arch/clock.h>
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static struct pit_reg *cur_pit = (struct pit_reg *)PIT_BASE_ADDR;
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DECLARE_GLOBAL_DATA_PTR;
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#define TIMER_LOAD_VAL 0xffffffff
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static inline unsigned long long tick_to_time(unsigned long long tick)
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{
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tick *= CONFIG_SYS_HZ;
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do_div(tick, mxc_get_clock(MXC_IPG_CLK));
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return tick;
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}
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static inline unsigned long long us_to_tick(unsigned long long usec)
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{
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usec = usec * mxc_get_clock(MXC_IPG_CLK) + 999999;
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do_div(usec, 1000000);
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return usec;
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}
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int timer_init(void)
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{
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__raw_writel(0, &cur_pit->mcr);
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__raw_writel(TIMER_LOAD_VAL, &cur_pit->ldval1);
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__raw_writel(0, &cur_pit->tctrl1);
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__raw_writel(1, &cur_pit->tctrl1);
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gd->arch.tbl = 0;
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gd->arch.tbu = 0;
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return 0;
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}
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unsigned long long get_ticks(void)
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{
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ulong now = TIMER_LOAD_VAL - __raw_readl(&cur_pit->cval1);
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/* increment tbu if tbl has rolled over */
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if (now < gd->arch.tbl)
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gd->arch.tbu++;
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gd->arch.tbl = now;
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return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
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}
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ulong get_timer_masked(void)
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{
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return tick_to_time(get_ticks());
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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 timstamp value */
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void __udelay(unsigned long usec)
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{
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unsigned long long start;
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ulong tmo;
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start = get_ticks(); /* get current timestamp */
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tmo = us_to_tick(usec); /* convert usecs to ticks */
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while ((get_ticks() - start) < tmo)
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; /* loop till time has passed */
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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 mxc_get_clock(MXC_IPG_CLK);
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}
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