49 lines
813 B
C
49 lines
813 B
C
|
/*
|
||
|
|
* linux/arch/sh/boards/sh03/led.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2004 Saito.K Interface Corporation.
|
||
|
|
*
|
||
|
|
* This file contains Interface CTP/PCI-SH03 specific LED code.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/sched.h>
|
||
|
|
|
||
|
|
/* Cycle the LED's in the clasic Knightrider/Sun pattern */
|
||
|
|
void heartbeat_sh03(void)
|
||
|
|
{
|
||
|
|
static unsigned int cnt = 0, period = 0;
|
||
|
|
volatile unsigned char* p = (volatile unsigned char*)0xa0800000;
|
||
|
|
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;
|
||
|
|
|
||
|
|
}
|