52 lines
968 B
C
52 lines
968 B
C
/*
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* linux/arch/sh/boards/se/7751/led.c
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*
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* Copyright (C) 2000 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 Solution Engine specific LED code.
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*/
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#include <linux/sched.h>
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#include <asm/se7751.h>
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/* Cycle the LED's in the clasic Knightrider/Sun pattern */
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void heartbeat_7751se(void)
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{
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static unsigned int cnt = 0, period = 0;
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volatile unsigned short* p = (volatile unsigned short*)PA_LED;
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static unsigned bit = 0, up = 1;
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cnt += 1;
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if (cnt < period) {
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return;
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}
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cnt = 0;
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/* Go through the points (roughly!):
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* f(0)=10, f(1)=16, f(2)=20, f(5)=35,f(inf)->110
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*/
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period = 110 - ( (300<<FSHIFT)/
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((avenrun[0]/5) + (3<<FSHIFT)) );
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if (up) {
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if (bit == 7) {
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bit--;
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up=0;
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} else {
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bit ++;
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}
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} else {
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if (bit == 0) {
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bit++;
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up=1;
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} else {
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bit--;
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}
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}
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*p = 1<<(bit+8);
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}
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