X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/rsbs2/blobdiff_plain/da7751cb0539c2ecb03ff66d05904626052e06e3..5bece6bf8c66ade0960290b6fe75623da7968e09:/bmc/chassis.c

diff --git a/bmc/chassis.c b/bmc/chassis.c
index 5bdad1f..29541f2 100644
--- a/bmc/chassis.c
+++ b/bmc/chassis.c
@@ -1,37 +1,147 @@
 #include <avr/io.h>
+#include <avr/interrupt.h>
 #include <stdio.h>
 
+#include "config.h"
 #include "chassis.h"
 
-#define DEBUG
+#ifdef __AVR_ATmega16__
+#define CHASSISPORT B
+#define POWER_PIN 0
+#define RESET_PIN 1
+#define ACTIVE_LOW
+#else
+#error "Please add chassis power/reset-PIN information for this chip"
+#endif
+
+#define __CPORT(port) PORT##port
+#define _CPORT(port) __CPORT(port)
+#define CPORT _CPORT(CHASSISPORT)
+
+#define __CDDR(port) DDR##port
+#define _CDDR(port) __CDDR(port)
+#define CDDR _CDDR(CHASSISPORT)
+
+static volatile int power_cnt = 0;
+static volatile int reset_cnt = 0;
+static volatile int power_cycle = 0;
+
+static void chassis_set_pins(uint8_t pins, uint8_t state);
 
 void chassis_init()
 {
-	DDRB = 0xff;
-	PORTB = 0xff;
+	chassis_set_pins((1<<POWER_PIN) | (1<<RESET_PIN), 0);
+
+	/* About 1ms */
+	OCR0 = ((F_CPU/64)/1000) - 1;
+
+	TCCR0 = ((1<<WGM01) | (1<<CS01) | (1<<CS00)); /* CTC, Prescaler 64 */
+	TIMSK |= (1<<OCIE0);
+
+}
+
+/* gracefully transition between tri-state and active */
+static void chassis_set_pins(uint8_t pins, uint8_t state)
+{
+	if(state) {
+		/* active */
+#ifndef ACTIVE_LOW
+		/* Pull UPs for a short moment... */
+		CPORT |= pins;
+#endif
+		CDDR |= pins;
+#ifdef ACTIVE_LOW
+		CPORT &= ~pins;
+#endif
+	} else {
+#ifdef ACTIVE_LOW
+		CPORT &= ~pins; /* NoOp... */
+#endif
+		CDDR &= ~pins;
+#ifndef ACTIVE_LOW
+		CPORT &= ~pins;
+#endif
+	}
+}
+
+static void chassis_power(int msec)
+{
+	uint8_t old_SREG = SREG;
+
+	chassis_set_pins((1<<POWER_PIN), 1);
+
+	cli();
+	if (!power_cnt)
+		power_cnt = msec;
+	SREG = old_SREG;
+}
+
+static void chassis_reset(int msec)
+{
+	uint8_t old_SREG = SREG;
+
+	chassis_set_pins((1<<RESET_PIN), 1);
+
+	cli();
+	if (!reset_cnt)
+		reset_cnt = msec;
+	SREG = old_SREG;
 }
 
 void chassis_control(unsigned char action)
 {
+	uint8_t old_SREG = SREG;
+
 #ifdef DEBUG
 	printf("Chassis control 0x%02x\n", action);
 #endif
 
 	switch(action) {
 		case CHASSIS_ACTION_POWER_DOWN:
-			PORTB=0xff;
+			chassis_power(POWERDOWN_TIME_MS);
 			break;
 
 		case CHASSIS_ACTION_POWER_UP:
-			PORTB=0x00;
+			chassis_power(POWERUP_TIME_MS);
 			break;
 
 		case CHASSIS_ACTION_HARD_RESET:
-			PORTB=0x55;
+			chassis_reset(RESET_TIME_MS);
 			break;
 
+		case CHASSIS_ACTION_POWER_CYCLE:
+			cli();
+			power_cycle = POWER_CYCLE_PAUSE_MS;
+			SREG = old_SREG;
+			chassis_power(POWERDOWN_TIME_MS);
+
 		default:
+#ifdef DEBUG
 			printf("Unimplemented chassis action 0x%02x\n", action);
+#endif
 			break;
 	}
 }
+
+ISR(TIMER0_COMP_vect)
+{
+	if (power_cnt) {
+		power_cnt--;
+
+		if (!power_cnt)
+			chassis_set_pins((1<<POWER_PIN), 0);
+	} else if (power_cycle) {
+		power_cycle--;
+
+		if (!power_cycle) {
+			chassis_set_pins((1<<POWER_PIN), 1);
+			power_cnt = POWERUP_TIME_MS;
+		}
+	}
+	if (reset_cnt) {
+		reset_cnt--;
+
+		if (!reset_cnt)
+			chassis_set_pins((1<<RESET_PIN), 0);
+	}
+}