X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/rsbs2/blobdiff_plain/19d56e392f87341e7abb26639e9b257aa78d4c92..adc673c160ccdab692adbb59b9ddbf10bae8b206:/bmc/chassis.c

diff --git a/bmc/chassis.c b/bmc/chassis.c
index 1b6822e..29541f2 100644
--- a/bmc/chassis.c
+++ b/bmc/chassis.c
@@ -1,6 +1,8 @@
 #include <avr/io.h>
+#include <avr/interrupt.h>
 #include <stdio.h>
 
+#include "config.h"
 #include "chassis.h"
 
 #ifdef __AVR_ATmega16__
@@ -20,70 +22,99 @@
 #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()
 {
 	chassis_set_pins((1<<POWER_PIN) | (1<<RESET_PIN), 0);
-	CDDR |= ((1<<POWER_PIN) | (1<<RESET_PIN));
+
+	/* 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)
 {
-#ifdef ACTIVE_LOW
-	state = !state;
-#endif
-
 	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)
 {
-	volatile int i;
+	uint8_t old_SREG = SREG;
 
 	chassis_set_pins((1<<POWER_PIN), 1);
 
-	/* FIXME */
-	for(i = 0; i < (msec<<2); i++);
-
-	chassis_set_pins((1<<POWER_PIN), 0);
+	cli();
+	if (!power_cnt)
+		power_cnt = msec;
+	SREG = old_SREG;
 }
 
 static void chassis_reset(int msec)
 {
-	volatile int i;
+	uint8_t old_SREG = SREG;
 
 	chassis_set_pins((1<<RESET_PIN), 1);
 
-	/* FIXME */
-	for(i = 0; i < (msec<<2); i++);
-
-	chassis_set_pins((1<<RESET_PIN), 0);
+	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:
-			chassis_power(5000);
+			chassis_power(POWERDOWN_TIME_MS);
 			break;
 
 		case CHASSIS_ACTION_POWER_UP:
-			chassis_power(500);
+			chassis_power(POWERUP_TIME_MS);
 			break;
 
 		case CHASSIS_ACTION_HARD_RESET:
-			chassis_reset(500);
+			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);
@@ -91,3 +122,26 @@ void chassis_control(unsigned char action)
 			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);
+	}
+}