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60 lines
1.3 KiB
60 lines
1.3 KiB
20 years ago
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/*
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* linux/arch/sh/overdrive/led.c
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*
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* Copyright (C) 1999 Stuart Menefy <stuart.menefy@st.com>
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* This file contains an Overdrive specific LED feature.
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*/
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#include <linux/config.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/overdrive/overdrive.h>
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static void mach_led(int position, int value)
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{
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unsigned long flags;
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unsigned long reg;
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local_irq_save(flags);
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reg = readl(OVERDRIVE_CTRL);
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if (value) {
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reg |= (1<<3);
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} else {
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reg &= ~(1<<3);
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}
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writel(reg, OVERDRIVE_CTRL);
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local_irq_restore(flags);
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}
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#ifdef CONFIG_HEARTBEAT
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#include <linux/sched.h>
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/* acts like an actual heart beat -- ie thump-thump-pause... */
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void heartbeat_od(void)
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{
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static unsigned cnt = 0, period = 0, dist = 0;
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if (cnt == 0 || cnt == dist)
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mach_led( -1, 1);
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else if (cnt == 7 || cnt == dist+7)
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mach_led( -1, 0);
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if (++cnt > period) {
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cnt = 0;
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/* The hyperbolic function below modifies the heartbeat period
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* length in dependency of the current (5min) load. It goes
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* through the points f(0)=126, f(1)=86, f(5)=51,
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* f(inf)->30. */
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period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
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dist = period / 4;
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}
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}
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#endif /* CONFIG_HEARTBEAT */
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