1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
84 TUNABLE_INT("hw.i8254.freq", &i8254_freq);
111 static int timer0_period = -2;
141 	if (i8254_timecounter && sc->period != 0) {  in clkintr()
153 	if (sc->et.et_active && sc->mode != MODE_STOP)  in clkintr()
154 		sc->et.et_event_cb(&sc->et, sc->et.et_arg);  in clkintr()
167 		return (-1);  in timer_spkr_acquire()
173 	 * knew the rate.  Use of splclock() limits glitches to 10-100us,  in timer_spkr_acquire()
188 		return (-1);  in timer_spkr_release()
197 timer_spkr_setfreq(int freq)  in timer_spkr_setfreq()  argument
200 	freq = i8254_freq / freq;  in timer_spkr_setfreq()
202 	outb(TIMER_CNTR2, freq & 0xff);  in timer_spkr_setfreq()
203 	outb(TIMER_CNTR2, freq >> 8);  in timer_spkr_setfreq()
214 	/* Select timer0 and latch counter value. */  in getit()
265 	n -= 0;			/* XXX actually guess no initial overhead */  in i8254_delay()
279 		ticks_left = ((u_int)n * 39099 + (1 << 15) - 1) >> 15;  in i8254_delay()
282 		 * Don't bother using fixed point, although gcc-2.7.2  in i8254_delay()
294 			tick = prev_tick - 1;  in i8254_delay()
303 		delta = prev_tick - tick;  in i8254_delay()
316 		ticks_left -= delta;  in i8254_delay()
336 			new_count = -1;  in set_i8254_freq()
344 	timer0_period = (mode == MODE_PERIODIC) ? new_count : -1;  in set_i8254_freq()
345 	switch (mode) {  in set_i8254_freq()
385 	timer0_period = -2;  in i8254_restore()
389 		set_i8254_freq(attimer_sc->mode, attimer_sc->period);  in i8254_restore()
440 	u_int freq;  in sysctl_machdep_i8254_freq()  local
446 	freq = i8254_freq;  in sysctl_machdep_i8254_freq()
447 	error = sysctl_handle_int(oidp, &freq, 0, req);  in sysctl_machdep_i8254_freq()
448 	if (error == 0 && req->newptr != NULL) {  in sysctl_machdep_i8254_freq()
449 		i8254_freq = freq;  in sysctl_machdep_i8254_freq()
451 			set_i8254_freq(attimer_sc->mode, attimer_sc->period);  in sysctl_machdep_i8254_freq()
452 			attimer_sc->tc.tc_frequency = freq;  in sysctl_machdep_i8254_freq()
468 	device_t dev = (device_t)tc->tc_priv;  in i8254_get_timecount()
474 	if (sc->period == 0)  in i8254_get_timecount()
475 		return (i8254_max_count - getit());  in i8254_get_timecount()
484 	/* Select timer0 and latch counter value. */  in i8254_get_timecount()
489 	count = i8254_max_count - ((high << 8) | low);  in i8254_get_timecount()
507 	device_t dev = (device_t)et->et_priv;  in attimer_start()
511 		sc->mode = MODE_PERIODIC;  in attimer_start()
512 		sc->period = period;  in attimer_start()
514 		sc->mode = MODE_ONESHOT;  in attimer_start()
515 		sc->period = first;  in attimer_start()
517 	if (!sc->intr_en) {  in attimer_start()
518 		i8254_intsrc->is_pic->pic_enable_source(i8254_intsrc);  in attimer_start()
519 		sc->intr_en = 1;  in attimer_start()
521 	set_i8254_freq(sc->mode, sc->period);  in attimer_start()
528 	device_t dev = (device_t)et->et_priv;  in attimer_stop()
531 	sc->mode = MODE_STOP;  in attimer_stop()
532 	sc->period = 0;  in attimer_stop()
533 	set_i8254_freq(sc->mode, sc->period);  in attimer_stop()
552 	/* ENOENT means no PnP-ID, device is hinted. */  in attimer_probe()
569 	if (!(sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT,  in attimer_attach()
570 	    &sc->port_rid, IO_TIMER1, IO_TIMER1 + 3, 4, RF_ACTIVE)))  in attimer_attach()
574 		i8254_pending = i8254_intsrc->is_pic->pic_source_pending;  in attimer_attach()
579 		sc->tc.tc_get_timecount = i8254_get_timecount;  in attimer_attach()
580 		sc->tc.tc_counter_mask = 0xffff;  in attimer_attach()
581 		sc->tc.tc_frequency = i8254_freq;  in attimer_attach()
582 		sc->tc.tc_name = "i8254";  in attimer_attach()
583 		sc->tc.tc_quality = 0;  in attimer_attach()
584 		sc->tc.tc_priv = dev;  in attimer_attach()
585 		tc_init(&sc->tc);  in attimer_attach()
589 	    	sc->intr_rid = 0;  in attimer_attach()
590 		while (bus_get_resource(dev, SYS_RES_IRQ, sc->intr_rid,  in attimer_attach()
592 			sc->intr_rid++;  in attimer_attach()
593 		if (!(sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,  in attimer_attach()
594 		    &sc->intr_rid, 0, 0, 1, RF_ACTIVE))) {  in attimer_attach()
599 		i8254_intsrc->is_handlers++;  in attimer_attach()
600 		if ((bus_setup_intr(dev, sc->intr_res,  in attimer_attach()
603 		    sc, &sc->intr_handler))) {  in attimer_attach()
605 			i8254_intsrc->is_handlers--;  in attimer_attach()
608 		i8254_intsrc->is_handlers--;  in attimer_attach()
609 		i8254_intsrc->is_pic->pic_enable_intr(i8254_intsrc);  in attimer_attach()
610 		sc->et.et_name = "i8254";  in attimer_attach()
611 		sc->et.et_flags = ET_FLAGS_PERIODIC;  in attimer_attach()
613 			sc->et.et_flags |= ET_FLAGS_ONESHOT;  in attimer_attach()
614 		sc->et.et_quality = 100;  in attimer_attach()
615 		sc->et.et_frequency = i8254_freq;  in attimer_attach()
616 		sc->et.et_min_period = (0x0002LLU << 32) / i8254_freq;  in attimer_attach()
617 		sc->et.et_max_period = (0xfffeLLU << 32) / i8254_freq;  in attimer_attach()
618 		sc->et.et_start = attimer_start;  in attimer_attach()
619 		sc->et.et_stop = attimer_stop;  in attimer_attach()
620 		sc->et.et_priv = dev;  in attimer_attach()
621 		et_register(&sc->et);  in attimer_attach()