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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2013 Freescale Semiconductor, Inc.
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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/clock.h>
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#include <linux/delay.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(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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/* 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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