arch/sh/boards/renesas/rts7751r2d/led.c

   1 /*
   2  * linux/arch/sh/kernel/led_rts7751r2d.c
   3  *
   4  * Copyright (C) Atom Create Engineering Co., Ltd.
   5  *
   6  * May be copied or modified under the terms of GNU General Public
   7  * License.  See linux/COPYING for more information.
   8  *
   9  * This file contains Renesas Technology Sales RTS7751R2D specific LED code.
  10  */
  11
  12 #include <linux/config.h>
  13 #include <asm/io.h>
  14 #include <asm/rts7751r2d/rts7751r2d.h>
  15
  16 extern unsigned int debug_counter;
  17
  18 #ifdef CONFIG_HEARTBEAT
  19
  20 #include <linux/sched.h>
  21
  22 /* Cycle the LED's in the clasic Knightriger/Sun pattern */
  23 void heartbeat_rts7751r2d(void)
  24 {
  25         static unsigned int cnt = 0, period = 0;
  26         volatile unsigned short *p = (volatile unsigned short *)PA_OUTPORT;
  27         static unsigned bit = 0, up = 1;
  28
  29         cnt += 1;
  30         if (cnt < period)
  31                 return;
  32
  33         cnt = 0;
  34
  35         /* Go through the points (roughly!):
  36          * f(0)=10, f(1)=16, f(2)=20, f(5)=35, f(int)->110
  37          */
  38         period = 110 - ((300 << FSHIFT)/((avenrun[0]/5) + (3<<FSHIFT)));
  39
  40         *p = 1 << bit;
  41         if (up)
  42                 if (bit == 7) {
  43                         bit--;
  44                         up = 0;
  45                 } else
  46                         bit++;
  47         else if (bit == 0)
  48                 up = 1;
  49         else
  50                 bit--;
  51 }
  52 #endif /* CONFIG_HEARTBEAT */
  53
  54 void rts7751r2d_led(unsigned short value)
  55 {
  56         ctrl_outw(value, PA_OUTPORT);
  57 }
  58
  59 void debug_led_disp(void)
  60 {
  61         unsigned short value;
  62
  63         value = (unsigned short)debug_counter++;
  64         rts7751r2d_led(value);
  65         if (value == 0xff)
  66                 debug_counter = 0;
  67 }