6ab3d5624e
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/*
|
|
* linux/arch/sh/stboards/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 ST40STB1 HARP and compatible code.
|
|
*/
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/harp/harp.h>
|
|
|
|
/* Harp: Flash LD10 (front pannel) connected to EPLD (IC8) */
|
|
/* Overdrive: Flash LD1 (front panel) connected to EPLD (IC4) */
|
|
/* Works for HARP and overdrive */
|
|
static void mach_led(int position, int value)
|
|
{
|
|
if (value) {
|
|
ctrl_outl(EPLD_LED_ON, EPLD_LED);
|
|
} else {
|
|
ctrl_outl(EPLD_LED_OFF, EPLD_LED);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_HEARTBEAT
|
|
|
|
#include <linux/sched.h>
|
|
|
|
/* acts like an actual heart beat -- ie thump-thump-pause... */
|
|
void heartbeat_harp(void)
|
|
{
|
|
static unsigned cnt = 0, period = 0, dist = 0;
|
|
|
|
if (cnt == 0 || cnt == dist)
|
|
mach_led( -1, 1);
|
|
else if (cnt == 7 || cnt == dist+7)
|
|
mach_led( -1, 0);
|
|
|
|
if (++cnt > period) {
|
|
cnt = 0;
|
|
/* The hyperbolic function below modifies the heartbeat period
|
|
* length in dependency of the current (5min) load. It goes
|
|
* through the points f(0)=126, f(1)=86, f(5)=51,
|
|
* f(inf)->30. */
|
|
period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
|
|
dist = period / 4;
|
|
}
|
|
}
|
|
#endif
|