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/*
* linux/arch/sh/boards/se/7751/led.c
*
* Copyright (C) 2000 Stuart Menefy <stuart.menefy@st.com>
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
* This file contains Solution Engine specific LED code.
*/
#include <linux/sched.h>
#include <asm/se7751.h>
/* Cycle the LED's in the clasic Knightrider/Sun pattern */
void heartbeat_7751se(void)
{
static unsigned int cnt = 0, period = 0;
volatile unsigned short* p = (volatile unsigned short*)PA_LED;
static unsigned bit = 0, up = 1;
cnt += 1;
if (cnt < period) {
return;
}
cnt = 0;
/* Go through the points (roughly!):
* f(0)=10, f(1)=16, f(2)=20, f(5)=35,f(inf)->110
*/
period = 110 - ( (300<<FSHIFT)/
((avenrun[0]/5) + (3<<FSHIFT)) );
if (up) {
if (bit == 7) {
bit--;
up=0;
} else {
bit ++;
}
} else {
if (bit == 0) {
bit++;
up=1;
} else {
bit--;
}
}
*p = 1<<(bit+8);
}
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