/*
* linux/arch/sh/boards/superh/microdev/led.c
*
* Copyright (C) 2002 Stuart Menefy <stuart.menefy@st.com>
* Copyright (C) 2003 Richard Curnow (Richard.Curnow@superh.com)
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
*/
#include <asm/io.h>
#define LED_REGISTER 0xa6104d20
static void mach_led_d9(int value)
{
unsigned long reg;
reg = ctrl_inl(LED_REGISTER);
reg &= ~1;
reg |= (value & 1);
ctrl_outl(reg, LED_REGISTER);
return;
}
static void mach_led_d10(int value)
{
unsigned long reg;
reg = ctrl_inl(LED_REGISTER);
reg &= ~2;
reg |= ((value & 1) << 1);
ctrl_outl(reg, LED_REGISTER);
return;
}
#ifdef CONFIG_HEARTBEAT
#include <linux/sched.h>
static unsigned char banner_table[] = {
0x11, 0x01, 0x11, 0x01, 0x11, 0x03,
0x11, 0x01, 0x11, 0x01, 0x13, 0x03,
0x11, 0x01, 0x13, 0x01, 0x13, 0x01, 0x11, 0x03,
0x11, 0x03,
0x11, 0x01, 0x13, 0x01, 0x11, 0x03,
0x11, 0x01, 0x11, 0x01, 0x11, 0x01, 0x11, 0x07,
0x13, 0x01, 0x13, 0x03,
0x11, 0x01, 0x11, 0x03,
0x13, 0x01, 0x11, 0x01, 0x13, 0x01, 0x11, 0x03,
0x11, 0x01, 0x13, 0x01, 0x11, 0x03,
0x13, 0x01, 0x13, 0x01, 0x13, 0x03,
0x13, 0x01, 0x11, 0x01, 0x11, 0x03,
0x11, 0x03,
0x11, 0x01, 0x11, 0x01, 0x11, 0x01, 0x13, 0x07,
0xff
};
static void banner(void)
{
static int pos = 0;
static int count = 0;
if (count) {
count--;
} else {
int val = banner_table[pos];
if (val == 0xff) {
pos = 0;
val = banner_table[pos];
}
pos++;
mach_led_d10((val >> 4) & 1);
count = 10 * (val & 0xf);
}
}
/* From heartbeat_harp in the stboards directory */
/* acts like an actual heart beat -- ie thump-thump-pause... */
void microdev_heartbeat(void)
{
static unsigned cnt = 0, period = 0, dist = 0;
if (cnt == 0 || cnt == dist)
mach_led_d9(1);
else if (cnt == 7 || cnt == dist+7)
mach_led_d9(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;
}
banner();
}
#endif
