mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-14 22:23:56 +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>
192 lines
4.2 KiB
C
192 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2009 Faraday Technology
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* Po-Yu Chuang <ratbert@faraday-tech.com>
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*
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* Copyright (C) 2011 Andes Technology Corporation
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* Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
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* Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
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*/
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#ifndef CONFIG_TIMER
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#include <common.h>
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#include <asm/io.h>
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#include <faraday/fttmr010.h>
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static ulong timestamp;
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static ulong lastdec;
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int timer_init(void)
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{
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struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
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unsigned int cr;
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debug("%s()\n", __func__);
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/* disable timers */
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writel(0, &tmr->cr);
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#ifdef CONFIG_FTTMR010_EXT_CLK
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/* use 32768Hz oscillator for RTC, WDT, TIMER */
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ftpmu010_32768osc_enable();
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#endif
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/* setup timer */
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writel(TIMER_LOAD_VAL, &tmr->timer3_load);
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writel(TIMER_LOAD_VAL, &tmr->timer3_counter);
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writel(0, &tmr->timer3_match1);
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writel(0, &tmr->timer3_match2);
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/* we don't want timer to issue interrupts */
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writel(FTTMR010_TM3_MATCH1 |
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FTTMR010_TM3_MATCH2 |
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FTTMR010_TM3_OVERFLOW,
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&tmr->interrupt_mask);
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cr = readl(&tmr->cr);
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#ifdef CONFIG_FTTMR010_EXT_CLK
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cr |= FTTMR010_TM3_CLOCK; /* use external clock */
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#endif
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cr |= FTTMR010_TM3_ENABLE;
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writel(cr, &tmr->cr);
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/* init the timestamp and lastdec value */
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reset_timer_masked();
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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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/*
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* reset time
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*/
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void reset_timer_masked(void)
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{
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struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
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/* capure current decrementer value time */
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#ifdef CONFIG_FTTMR010_EXT_CLK
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lastdec = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
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#else
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lastdec = readl(&tmr->timer3_counter) /
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(CONFIG_SYS_CLK_FREQ / 2 / CONFIG_SYS_HZ);
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#endif
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timestamp = 0; /* start "advancing" time stamp from 0 */
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debug("%s(): lastdec = %lx\n", __func__, lastdec);
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}
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void reset_timer(void)
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{
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debug("%s()\n", __func__);
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reset_timer_masked();
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}
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/*
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* return timer ticks
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*/
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ulong get_timer_masked(void)
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{
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struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
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/* current tick value */
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#ifdef CONFIG_FTTMR010_EXT_CLK
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ulong now = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
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#else
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ulong now = readl(&tmr->timer3_counter) /
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(CONFIG_SYS_CLK_FREQ / 2 / CONFIG_SYS_HZ);
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#endif
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debug("%s(): now = %lx, lastdec = %lx\n", __func__, now, lastdec);
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if (lastdec >= now) {
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/*
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* normal mode (non roll)
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* move stamp fordward with absoulte diff ticks
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*/
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timestamp += lastdec - now;
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} else {
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/*
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* we have overflow of the count down timer
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*
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* nts = ts + ld + (TLV - now)
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* ts=old stamp, ld=time that passed before passing through -1
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* (TLV-now) amount of time after passing though -1
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* nts = new "advancing time stamp"...it could also roll and
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* cause problems.
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*/
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timestamp += lastdec + TIMER_LOAD_VAL - now;
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}
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lastdec = now;
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debug("%s() returns %lx\n", __func__, timestamp);
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return timestamp;
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}
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/*
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* return difference between timer ticks and base
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*/
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ulong get_timer(ulong base)
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{
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debug("%s(%lx)\n", __func__, base);
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return get_timer_masked() - base;
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}
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void set_timer(ulong t)
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{
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debug("%s(%lx)\n", __func__, t);
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timestamp = t;
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}
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/* delay x useconds AND preserve advance timestamp value */
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void __udelay(unsigned long usec)
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{
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struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
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#ifdef CONFIG_FTTMR010_EXT_CLK
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long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
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#else
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long tmo = usec * ((CONFIG_SYS_CLK_FREQ / 2) / 1000) / 1000;
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#endif
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unsigned long now, last = readl(&tmr->timer3_counter);
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debug("%s(%lu)\n", __func__, usec);
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while (tmo > 0) {
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now = readl(&tmr->timer3_counter);
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if (now > last) /* count down timer overflow */
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tmo -= TIMER_LOAD_VAL + last - now;
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else
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tmo -= last - now;
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last = now;
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}
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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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debug("%s()\n", __func__);
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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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debug("%s()\n", __func__);
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#ifdef CONFIG_FTTMR010_EXT_CLK
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return CONFIG_SYS_HZ;
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#else
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return CONFIG_SYS_CLK_FREQ;
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#endif
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}
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#endif /* CONFIG_TIMER */
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