70 lines
1.2 KiB
C
70 lines
1.2 KiB
C
/*
|
|
* linux/arch/sh/boards/se/7300/led.c
|
|
*
|
|
* Derived from linux/arch/sh/boards/se/770x/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/config.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/mach/se7300.h>
|
|
|
|
static void
|
|
mach_led(int position, int value)
|
|
{
|
|
volatile unsigned short *p = (volatile unsigned short *) PA_LED;
|
|
|
|
if (value) {
|
|
*p |= (1 << 8);
|
|
} else {
|
|
*p &= ~(1 << 8);
|
|
}
|
|
}
|
|
|
|
|
|
/* Cycle the LED's in the clasic Knightrider/Sun pattern */
|
|
void
|
|
heartbeat_7300se(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);
|
|
|
|
}
|
|
|