git.zerfleddert.de Git - rsbs2/blob - bmc/chassis.c

   1 #include <avr/io.h>
   2 #include <stdio.h>
   3
   4 #include "chassis.h"
   5
   6 #ifdef __AVR_ATmega16__
   7 #define CHASSISPORT B
   8 #define POWER_PIN 0
   9 #define RESET_PIN 1
  10 #define ACTIVE_LOW
  11 #else
  12 #error "Please add chassis power/reset-PIN information for this chip"
  13 #endif
  14
  15 #define __CPORT(port) PORT##port
  16 #define _CPORT(port) __CPORT(port)
  17 #define CPORT _CPORT(CHASSISPORT)
  18
  19 #define __CDDR(port) DDR##port
  20 #define _CDDR(port) __CDDR(port)
  21 #define CDDR _CDDR(CHASSISPORT)
  22
  23 static void chassis_set_pins(uint8_t pins, uint8_t state);
  24
  25 void chassis_init()
  26 {
  27         chassis_set_pins((1<<POWER_PIN) | (1<<RESET_PIN), 0);
  28         CDDR |= ((1<<POWER_PIN) | (1<<RESET_PIN));
  29 }
  30
  31 static void chassis_set_pins(uint8_t pins, uint8_t state)
  32 {
  33 #ifdef ACTIVE_LOW
  34         state = !state;
  35 #endif
  36
  37         if(state) {
  38                 CPORT |= pins;
  39         } else {
  40                 CPORT &= ~pins;
  41         }
  42 }
  43
  44 static void chassis_power(int msec)
  45 {
  46         volatile int i;
  47
  48         chassis_set_pins((1<<POWER_PIN), 1);
  49
  50         /* FIXME */
  51         for(i = 0; i < (msec<<2); i++);
  52
  53         chassis_set_pins((1<<POWER_PIN), 0);
  54 }
  55
  56 static void chassis_reset(int msec)
  57 {
  58         volatile int i;
  59
  60         chassis_set_pins((1<<RESET_PIN), 1);
  61
  62         /* FIXME */
  63         for(i = 0; i < (msec<<2); i++);
  64
  65         chassis_set_pins((1<<RESET_PIN), 0);
  66 }
  67
  68 void chassis_control(unsigned char action)
  69 {
  70 #ifdef DEBUG
  71         printf("Chassis control 0x%02x\n", action);
  72 #endif
  73
  74         switch(action) {
  75                 case CHASSIS_ACTION_POWER_DOWN:
  76                         chassis_power(5000);
  77                         break;
  78
  79                 case CHASSIS_ACTION_POWER_UP:
  80                         chassis_power(500);
  81                         break;
  82
  83                 case CHASSIS_ACTION_HARD_RESET:
  84                         chassis_reset(500);
  85                         break;
  86
  87                 default:
  88 #ifdef DEBUG
  89                         printf("Unimplemented chassis action 0x%02x\n", action);
  90 #endif
  91                         break;
  92         }
  93 }