mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-19 03:03:22 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
128 lines
2.5 KiB
C
128 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2014 Freescale Semiconductor, Inc.
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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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