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https://github.com/AsahiLinux/u-boot
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a2ac2b964b
This converts the following to Kconfig: CONFIG_SKIP_LOWLEVEL_INIT CONFIG_SKIP_LOWLEVEL_INIT_ONLY In order to do this, we need to introduce SPL and TPL variants of these options so that we can clearly disable these options only in SPL in some cases, and both instances in other cases. Signed-off-by: Tom Rini <trini@konsulko.com>
126 lines
2.5 KiB
C
126 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Freescale Semiconductor, Inc.
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*
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* The file use ls102xa/timer.c as a reference.
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*/
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#include <common.h>
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#include <init.h>
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#include <time.h>
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#include <asm/global_data.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/sys_proto.h>
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#include <asm/mach-imx/syscounter.h>
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#include <linux/delay.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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#if !CONFIG_IS_ENABLED(SKIP_LOWLEVEL_INIT)
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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 val, freq;
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freq = CONFIG_SC_TIMER_CLK;
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asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
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writel(freq, &sctr->cntfid0);
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/* Enable system counter */
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val = readl(&sctr->cntcr);
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val &= ~(SC_CNTCR_FREQ0 | SC_CNTCR_FREQ1);
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val |= SC_CNTCR_FREQ0 | SC_CNTCR_ENABLE | SC_CNTCR_HDBG;
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writel(val, &sctr->cntcr);
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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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#endif
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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 volatile("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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ulong get_timer(ulong base)
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{
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return tick_to_time(get_ticks()) - base;
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}
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void __udelay(unsigned long usec)
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{
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unsigned long long tmp;
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ulong tmo;
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tmo = us_to_tick(usec);
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tmp = get_ticks() + tmo; /* get current timestamp */
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while (get_ticks() < tmp) /* loop till event */
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/*NOP*/;
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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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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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