arch/sh/boards/superh/microdev/led.c

   1 /*
   2  * linux/arch/sh/boards/superh/microdev/led.c
   3  *
   4  * Copyright (C) 2002 Stuart Menefy <stuart.menefy@st.com>
   5  * Copyright (C) 2003 Richard Curnow (Richard.Curnow@superh.com)
   6  *
   7  * May be copied or modified under the terms of the GNU General Public
   8  * License.  See linux/COPYING for more information.
   9  *
  10  */
  11
  12 #include <asm/io.h>
  13
  14 #define LED_REGISTER 0xa6104d20
  15
  16 static void mach_led_d9(int value)
  17 {
  18         unsigned long reg;
  19         reg = ctrl_inl(LED_REGISTER);
  20         reg &= ~1;
  21         reg |= (value & 1);
  22         ctrl_outl(reg, LED_REGISTER);
  23         return;
  24 }
  25
  26 static void mach_led_d10(int value)
  27 {
  28         unsigned long reg;
  29         reg = ctrl_inl(LED_REGISTER);
  30         reg &= ~2;
  31         reg |= ((value & 1) << 1);
  32         ctrl_outl(reg, LED_REGISTER);
  33         return;
  34 }
  35
  36
  37 #ifdef CONFIG_HEARTBEAT
  38 #include <linux/sched.h>
  39
  40 static unsigned char banner_table[] = {
  41         0x11, 0x01, 0x11, 0x01, 0x11, 0x03,
  42         0x11, 0x01, 0x11, 0x01, 0x13, 0x03,
  43         0x11, 0x01, 0x13, 0x01, 0x13, 0x01, 0x11, 0x03,
  44         0x11, 0x03,
  45         0x11, 0x01, 0x13, 0x01, 0x11, 0x03,
  46         0x11, 0x01, 0x11, 0x01, 0x11, 0x01, 0x11, 0x07,
  47         0x13, 0x01, 0x13, 0x03,
  48         0x11, 0x01, 0x11, 0x03,
  49         0x13, 0x01, 0x11, 0x01, 0x13, 0x01, 0x11, 0x03,
  50         0x11, 0x01, 0x13, 0x01, 0x11, 0x03,
  51         0x13, 0x01, 0x13, 0x01, 0x13, 0x03,
  52         0x13, 0x01, 0x11, 0x01, 0x11, 0x03,
  53         0x11, 0x03,
  54         0x11, 0x01, 0x11, 0x01, 0x11, 0x01, 0x13, 0x07,
  55         0xff
  56 };
  57
  58 static void banner(void)
  59 {
  60         static int pos = 0;
  61         static int count = 0;
  62
  63         if (count) {
  64                 count--;
  65         } else {
  66                 int val = banner_table[pos];
  67                 if (val == 0xff) {
  68                         pos = 0;
  69                         val = banner_table[pos];
  70                 }
  71                 pos++;
  72                 mach_led_d10((val >> 4) & 1);
  73                 count = 10 * (val & 0xf);
  74         }
  75 }
  76
  77 /* From heartbeat_harp in the stboards directory */
  78 /* acts like an actual heart beat -- ie thump-thump-pause... */
  79 void microdev_heartbeat(void)
  80 {
  81         static unsigned cnt = 0, period = 0, dist = 0;
  82
  83         if (cnt == 0 || cnt == dist)
  84                 mach_led_d9(1);
  85         else if (cnt == 7 || cnt == dist+7)
  86                 mach_led_d9(0);
  87
  88         if (++cnt > period) {
  89                 cnt = 0;
  90                 /* The hyperbolic function below modifies the heartbeat period
  91                  * length in dependency of the current (5min) load. It goes
  92                  * through the points f(0)=126, f(1)=86, f(5)=51,
  93                  * f(inf)->30. */
  94                 period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
  95                 dist = period / 4;
  96         }
  97
  98         banner();
  99 }
 100
 101 #endif