mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-13 14:46:21 +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>
168 lines
3.8 KiB
C
168 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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*
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* (C) Copyright 2002
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* David Mueller, ELSOFT AG, <d.mueller@elsoft.ch>
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*
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* (C) Copyright 2003
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* Texas Instruments, <www.ti.com>
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* Kshitij Gupta <Kshitij@ti.com>
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*
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* (C) Copyright 2004
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* ARM Ltd.
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* Philippe Robin, <philippe.robin@arm.com>
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*/
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#include <common.h>
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#include <div64.h>
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#ifdef CONFIG_ARCH_CINTEGRATOR
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#define DIV_CLOCK_INIT 1
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#define TIMER_LOAD_VAL 0xFFFFFFFFL
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#else
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#define DIV_CLOCK_INIT 256
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#define TIMER_LOAD_VAL 0x0000FFFFL
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#endif
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/* The Integrator/CP timer1 is clocked at 1MHz
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* can be divided by 16 or 256
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* and can be set up as a 32-bit timer
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*/
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/* U-Boot expects a 32 bit timer, running at CONFIG_SYS_HZ */
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/* Keep total timer count to avoid losing decrements < div_timer */
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static unsigned long long total_count = 0;
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static unsigned long long lastdec; /* Timer reading at last call */
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/* Divisor applied to timer clock */
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static unsigned long long div_clock = DIV_CLOCK_INIT;
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static unsigned long long div_timer = 1; /* Divisor to convert timer reading
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* change to U-Boot ticks
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*/
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/* CONFIG_SYS_HZ = CONFIG_SYS_HZ_CLOCK/(div_clock * div_timer) */
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static ulong timestamp; /* U-Boot ticks since startup */
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#define READ_TIMER (*(volatile ulong *)(CONFIG_SYS_TIMERBASE+4))
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/* all function return values in U-Boot ticks i.e. (1/CONFIG_SYS_HZ) sec
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* - unless otherwise stated
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*/
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/* starts up a counter
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* - the Integrator/CP timer can be set up to issue an interrupt */
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int timer_init (void)
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{
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/* Load timer with initial value */
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*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 0) = TIMER_LOAD_VAL;
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#ifdef CONFIG_ARCH_CINTEGRATOR
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/* Set timer to be
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* enabled 1
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* periodic 1
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* no interrupts 0
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* X 0
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* divider 1 00 == less rounding error
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* 32 bit 1
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* wrapping 0
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*/
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*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) = 0x000000C2;
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#else
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/* Set timer to be
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* enabled 1
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* free-running 0
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* XX 00
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* divider 256 10
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* XX 00
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*/
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*(volatile ulong *)(CONFIG_SYS_TIMERBASE + 8) = 0x00000088;
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#endif
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/* init the timestamp */
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total_count = 0ULL;
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/* capure current decrementer value */
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lastdec = READ_TIMER;
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/* start "advancing" time stamp from 0 */
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timestamp = 0L;
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div_timer = CONFIG_SYS_HZ_CLOCK;
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do_div(div_timer, CONFIG_SYS_HZ);
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do_div(div_timer, div_clock);
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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_ticks)
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{
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return get_timer_masked () - base_ticks;
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}
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/* delay usec useconds */
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void __udelay (unsigned long usec)
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{
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ulong tmo, tmp;
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/* Convert to U-Boot ticks */
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tmo = usec * CONFIG_SYS_HZ;
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tmo /= (1000000L);
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tmp = get_timer_masked(); /* get current timestamp */
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tmo += tmp; /* form target timestamp */
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while (get_timer_masked () < tmo) {/* loop till event */
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/*NOP*/;
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}
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}
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/* converts the timer reading to U-Boot ticks */
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/* the timestamp is the number of ticks since reset */
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ulong get_timer_masked (void)
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{
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/* get current count */
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unsigned long long now = READ_TIMER;
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if(now > lastdec) {
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/* Must have wrapped */
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total_count += lastdec + TIMER_LOAD_VAL + 1 - now;
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} else {
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total_count += lastdec - now;
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}
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lastdec = now;
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/* Reuse "now" */
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now = total_count;
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do_div(now, div_timer);
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timestamp = now;
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return timestamp;
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}
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/* waits specified delay value and resets timestamp */
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void udelay_masked (unsigned long usec)
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{
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udelay(usec);
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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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* Return the timebase clock frequency
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* i.e. how often the timer decrements
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*/
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ulong get_tbclk (void)
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{
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unsigned long long tmp = CONFIG_SYS_HZ_CLOCK;
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do_div(tmp, div_clock);
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return tmp;
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}
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