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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright 2014 Freescale Semiconductor, Inc.
- */
- #include <common.h>
- #include <init.h>
- #include <time.h>
- #include <asm/global_data.h>
- #include <asm/io.h>
- #include <div64.h>
- #include <asm/arch/immap_ls102xa.h>
- #include <asm/arch/clock.h>
- #include <linux/delay.h>
- DECLARE_GLOBAL_DATA_PTR;
- /*
- * This function is intended for SHORT delays only.
- * It will overflow at around 10 seconds @ 400MHz,
- * or 20 seconds @ 200MHz.
- */
- unsigned long usec2ticks(unsigned long usec)
- {
- ulong ticks;
- if (usec < 1000)
- ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
- else
- ticks = ((usec / 10) * (get_tbclk() / 100000));
- return ticks;
- }
- static inline unsigned long long tick_to_time(unsigned long long tick)
- {
- unsigned long freq;
- asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
- tick *= CONFIG_SYS_HZ;
- do_div(tick, freq);
- return tick;
- }
- static inline unsigned long long us_to_tick(unsigned long long usec)
- {
- unsigned long freq;
- asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
- usec = usec * freq + 999999;
- do_div(usec, 1000000);
- return usec;
- }
- int timer_init(void)
- {
- struct sctr_regs *sctr = (struct sctr_regs *)SCTR_BASE_ADDR;
- unsigned long ctrl, freq;
- unsigned long long val;
- /* Enable System Counter */
- writel(SYS_COUNTER_CTRL_ENABLE, &sctr->cntcr);
- freq = COUNTER_FREQUENCY;
- asm("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
- /* Set PL1 Physical Timer Ctrl */
- ctrl = ARCH_TIMER_CTRL_ENABLE;
- asm("mcr p15, 0, %0, c14, c2, 1" : : "r" (ctrl));
- /* Set PL1 Physical Comp Value */
- val = TIMER_COMP_VAL;
- asm("mcrr p15, 2, %Q0, %R0, c14" : : "r" (val));
- gd->arch.tbl = 0;
- gd->arch.tbu = 0;
- return 0;
- }
- unsigned long long get_ticks(void)
- {
- unsigned long long now;
- asm("mrrc p15, 0, %Q0, %R0, c14" : "=r" (now));
- gd->arch.tbl = (unsigned long)(now & 0xffffffff);
- gd->arch.tbu = (unsigned long)(now >> 32);
- return now;
- }
- unsigned long get_timer(ulong base)
- {
- return tick_to_time(get_ticks()) - base;
- }
- /* delay x useconds and preserve advance timstamp value */
- void __udelay(unsigned long usec)
- {
- unsigned long long start;
- unsigned long tmo;
- start = get_ticks(); /* get current timestamp */
- tmo = us_to_tick(usec); /* convert usecs to ticks */
- while ((get_ticks() - start) < tmo)
- ; /* loop till time has passed */
- }
- /*
- * This function is derived from PowerPC code (timebase clock frequency).
- * On ARM it returns the number of timer ticks per second.
- */
- unsigned long get_tbclk(void)
- {
- unsigned long freq;
- asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));
- return freq;
- }
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