| /* |
| * 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 <linux/config.h> |
| #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 |
