[rsbs2] / bmc / chassis.c

#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdio.h>

#include "chassis.h"

#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 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/256)/1000)-1;

	TCCR0 = ((1<<WGM01) | (1<<CS02)); /* CTC, Prescaler 256 */
	TIMSK |= (1<<OCIE0);

}

static void chassis_set_pins(uint8_t pins, uint8_t state)
{
#ifdef ACTIVE_LOW
	state = !state;
#endif

	if(state) {
		CPORT |= pins;
	} else {
		CPORT &= ~pins;
	}
}

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)
{
#ifdef DEBUG
	printf("Chassis control 0x%02x\n", action);
#endif

	switch(action) {
		case CHASSIS_ACTION_POWER_DOWN:
			chassis_power(5000);
			break;

		case CHASSIS_ACTION_POWER_UP:
			chassis_power(500);
			break;

		case CHASSIS_ACTION_HARD_RESET:
			chassis_reset(500);
			break;

		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);
	}
	if (reset_cnt) {
		reset_cnt--;

		if (!reset_cnt)
			chassis_set_pins((1<<RESET_PIN), 0);
	}
}
Commit	Line	Data
da7751cb	1	#include <avr/io.h>
93402c2c	2	#include <avr/interrupt.h>
da7751cb MG	3	#include <stdio.h>
	4
	5	#include "chassis.h"
	6
19d56e39 MG	7	#ifdef __AVR_ATmega16__
	8	#define CHASSISPORT B
	9	#define POWER_PIN 0
	10	#define RESET_PIN 1
	11	#define ACTIVE_LOW
	12	#else
	13	#error "Please add chassis power/reset-PIN information for this chip"
	14	#endif
	15
	16	#define __CPORT(port) PORT##port
	17	#define _CPORT(port) __CPORT(port)
	18	#define CPORT _CPORT(CHASSISPORT)
	19
	20	#define __CDDR(port) DDR##port
	21	#define _CDDR(port) __CDDR(port)
	22	#define CDDR _CDDR(CHASSISPORT)
	23
93402c2c MG	24	static volatile int power_cnt = 0;
	25	static volatile int reset_cnt = 0;
	26
19d56e39 MG	27	static void chassis_set_pins(uint8_t pins, uint8_t state);
19d56e39 MG	28
da7751cb MG	29	void chassis_init()
da7751cb MG	30	{
19d56e39 MG	31	chassis_set_pins((1<<POWER_PIN) \| (1<<RESET_PIN), 0);
19d56e39 MG	32	CDDR \|= ((1<<POWER_PIN) \| (1<<RESET_PIN));
93402c2c MG	33
	34	/* About 1ms */
	35	OCR0 = ((F_CPU/256)/1000)-1;
	36
	37	TCCR0 = ((1<<WGM01) \| (1<<CS02)); /* CTC, Prescaler 256 */
	38	TIMSK \|= (1<<OCIE0);
	39
19d56e39 MG	40	}
	41
	42	static void chassis_set_pins(uint8_t pins, uint8_t state)
	43	{
	44	#ifdef ACTIVE_LOW
	45	state = !state;
	46	#endif
	47
	48	if(state) {
	49	CPORT \|= pins;
	50	} else {
	51	CPORT &= ~pins;
	52	}
	53	}
	54
	55	static void chassis_power(int msec)
	56	{
93402c2c	57	uint8_t old_SREG = SREG;
19d56e39 MG	58
	59	chassis_set_pins((1<<POWER_PIN), 1);
	60
93402c2c MG	61	cli();
	62	if (!power_cnt)
	63	power_cnt = msec;
	64	SREG = old_SREG;
19d56e39 MG	65	}
	66
	67	static void chassis_reset(int msec)
	68	{
93402c2c	69	uint8_t old_SREG = SREG;
19d56e39 MG	70
	71	chassis_set_pins((1<<RESET_PIN), 1);
	72
93402c2c MG	73	cli();
	74	if (!reset_cnt)
	75	reset_cnt = msec;
	76	SREG = old_SREG;
da7751cb MG	77	}
	78
	79	void chassis_control(unsigned char action)
	80	{
	81	#ifdef DEBUG
	82	printf("Chassis control 0x%02x\n", action);
	83	#endif
	84
	85	switch(action) {
	86	case CHASSIS_ACTION_POWER_DOWN:
19d56e39	87	chassis_power(5000);
da7751cb MG	88	break;
	89
	90	case CHASSIS_ACTION_POWER_UP:
19d56e39	91	chassis_power(500);
da7751cb MG	92	break;
	93
	94	case CHASSIS_ACTION_HARD_RESET:
19d56e39	95	chassis_reset(500);
da7751cb MG	96	break;
	97
	98	default:
f9d5c6e0	99	#ifdef DEBUG
da7751cb	100	printf("Unimplemented chassis action 0x%02x\n", action);
f9d5c6e0	101	#endif
da7751cb MG	102	break;
	103	}
	104	}
93402c2c MG	105
	106	ISR(TIMER0_COMP_vect)
	107	{
	108	if (power_cnt) {
	109	power_cnt--;
	110
	111	if (!power_cnt)
	112	chassis_set_pins((1<<POWER_PIN), 0);
	113	}
	114	if (reset_cnt) {
	115	reset_cnt--;
	116
	117	if (!reset_cnt)
	118	chassis_set_pins((1<<RESET_PIN), 0);
	119	}
	120	}