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led_7751se.c
Package: linux-2.4.20.tar.gz [view]
Upload User: jlfgdled
Upload Date: 2013-04-10
Package Size: 33168k
Code Size: 1k
Category:
Linux-Unix program
Development Platform:
Unix_Linux
- /*
- * linux/arch/sh/kernel/led_se.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 <asm/hitachi_7751se.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);
- }
- }
- #ifdef CONFIG_HEARTBEAT
- #include <linux/sched.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);
- }
- #endif /* CONFIG_HEARTBEAT */