/*
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* Copyright 2014 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/immap_ls102xa.h>
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#include <asm/arch/clock.h>
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DECLARE_GLOBAL_DATA_PTR;
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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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return ticks;
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}
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static inline unsigned long long tick_to_time(unsigned long long tick)
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{
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unsigned long freq;
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asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
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tick *= CONFIG_SYS_HZ;
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do_div(tick, freq);
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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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unsigned long freq;
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asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
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usec = usec * freq + 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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struct sctr_regs *sctr = (struct sctr_regs *)SCTR_BASE_ADDR;
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unsigned long ctrl, freq;
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unsigned long long val;
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/* Enable System Counter */
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writel(SYS_COUNTER_CTRL_ENABLE, &sctr->cntcr);
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freq = COUNTER_FREQUENCY;
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asm("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
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/* Set PL1 Physical Timer Ctrl */
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ctrl = ARCH_TIMER_CTRL_ENABLE;
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asm("mcr p15, 0, %0, c14, c2, 1" : : "r" (ctrl));
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/* Set PL1 Physical Comp Value */
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val = TIMER_COMP_VAL;
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asm("mcrr p15, 2, %Q0, %R0, c14" : : "r" (val));
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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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unsigned long long now;
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asm("mrrc p15, 0, %Q0, %R0, c14" : "=r" (now));
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gd->arch.tbl = (unsigned long)(now & 0xffffffff);
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gd->arch.tbu = (unsigned long)(now >> 32);
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return now;
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}
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unsigned long 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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unsigned long 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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unsigned long 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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unsigned long get_tbclk(void)
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{
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unsigned long freq;
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asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
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return freq;
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}
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