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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 commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2008
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* Texas Instruments
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*
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* Richard Woodruff <r-woodruff2@ti.com>
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* Syed Moahmmed Khasim <khasim@ti.com>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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* Alex Zuepke <azu@sysgo.de>
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*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
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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 <asm/arch/cpu.h>
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#include <asm/arch/clock.h>
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#include <asm/omap_common.h>
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#include <linux/delay.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct gptimer *timer_base = (struct gptimer *)CFG_SYS_TIMERBASE;
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static ulong get_timer_masked(void);
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/*
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* Nothing really to do with interrupts, just starts up a counter.
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*/
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#define TIMER_CLOCK (V_SCLK / (2 << SYS_PTV))
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#define TIMER_OVERFLOW_VAL 0xffffffff
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#define TIMER_LOAD_VAL 0
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int timer_init(void)
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{
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/* start the counter ticking up, reload value on overflow */
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writel(TIMER_LOAD_VAL, &timer_base->tldr);
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/* enable timer */
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writel((SYS_PTV << 2) | TCLR_PRE | TCLR_AR | TCLR_ST,
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&timer_base->tclr);
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return 0;
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}
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/*
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* timer without interrupts
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*/
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ulong 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 */
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void __udelay(unsigned long usec)
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{
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long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
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unsigned long now, last = readl(&timer_base->tcrr);
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while (tmo > 0) {
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now = readl(&timer_base->tcrr);
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if (last > now) /* count up timer overflow */
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tmo -= TIMER_OVERFLOW_VAL - last + now + 1;
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else
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tmo -= now - last;
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last = now;
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}
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}
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static ulong get_timer_masked(void)
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{
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/* current tick value */
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ulong now = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
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if (now >= gd->arch.lastinc) { /* normal mode (non roll) */
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/* move stamp fordward with absoulte diff ticks */
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gd->arch.tbl += (now - gd->arch.lastinc);
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} else { /* we have rollover of incrementer */
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gd->arch.tbl += ((TIMER_OVERFLOW_VAL / (TIMER_CLOCK /
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CONFIG_SYS_HZ)) - gd->arch.lastinc) + now;
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}
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gd->arch.lastinc = now;
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return gd->arch.tbl;
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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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 CONFIG_SYS_HZ;
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}
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