103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
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/*
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* linux/arch/sh/kernel/led_microdev.c
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*
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* Copyright (C) 2002 Stuart Menefy <stuart.menefy@st.com>
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* Copyright (C) 2003 Richard Curnow (Richard.Curnow@superh.com)
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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*/
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#include <linux/config.h>
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#include <asm/io.h>
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#define LED_REGISTER 0xa6104d20
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static void mach_led_d9(int value)
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{
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unsigned long reg;
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reg = ctrl_inl(LED_REGISTER);
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reg &= ~1;
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reg |= (value & 1);
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ctrl_outl(reg, LED_REGISTER);
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return;
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}
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static void mach_led_d10(int value)
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{
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unsigned long reg;
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reg = ctrl_inl(LED_REGISTER);
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reg &= ~2;
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reg |= ((value & 1) << 1);
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ctrl_outl(reg, LED_REGISTER);
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return;
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}
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#ifdef CONFIG_HEARTBEAT
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#include <linux/sched.h>
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static unsigned char banner_table[] = {
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0x11, 0x01, 0x11, 0x01, 0x11, 0x03,
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0x11, 0x01, 0x11, 0x01, 0x13, 0x03,
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0x11, 0x01, 0x13, 0x01, 0x13, 0x01, 0x11, 0x03,
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0x11, 0x03,
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0x11, 0x01, 0x13, 0x01, 0x11, 0x03,
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0x11, 0x01, 0x11, 0x01, 0x11, 0x01, 0x11, 0x07,
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0x13, 0x01, 0x13, 0x03,
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0x11, 0x01, 0x11, 0x03,
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0x13, 0x01, 0x11, 0x01, 0x13, 0x01, 0x11, 0x03,
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0x11, 0x01, 0x13, 0x01, 0x11, 0x03,
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0x13, 0x01, 0x13, 0x01, 0x13, 0x03,
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0x13, 0x01, 0x11, 0x01, 0x11, 0x03,
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0x11, 0x03,
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0x11, 0x01, 0x11, 0x01, 0x11, 0x01, 0x13, 0x07,
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0xff
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};
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static void banner(void)
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{
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static int pos = 0;
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static int count = 0;
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if (count) {
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count--;
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} else {
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int val = banner_table[pos];
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if (val == 0xff) {
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pos = 0;
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val = banner_table[pos];
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}
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pos++;
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mach_led_d10((val >> 4) & 1);
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count = 10 * (val & 0xf);
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}
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}
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/* From heartbeat_harp in the stboards directory */
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/* acts like an actual heart beat -- ie thump-thump-pause... */
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void microdev_heartbeat(void)
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{
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static unsigned cnt = 0, period = 0, dist = 0;
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if (cnt == 0 || cnt == dist)
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mach_led_d9(1);
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else if (cnt == 7 || cnt == dist+7)
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mach_led_d9(0);
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if (++cnt > period) {
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cnt = 0;
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/* The hyperbolic function below modifies the heartbeat period
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* length in dependency of the current (5min) load. It goes
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* through the points f(0)=126, f(1)=86, f(5)=51,
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* f(inf)->30. */
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period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
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dist = period / 4;
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}
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banner();
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}
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#endif
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