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led.c

/*
 * 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

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