| /* |
| * 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 <asm/se7751/se7751.h> |
| #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); |
| |
| } |