1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
29  * PIC driver for the 8259A Master and Slave PICs in PC/AT machines.
67 #define	SLAVE	1  macro
69 #define	IMEN_MASK(ai)		(IRQ_MASK((ai)->at_irq))
93 #define	IRQ(ap, ai)	((ap)->at_irqbase + (ai)->at_irq)
149 static void i8259_init(struct atpic *pic, int slave);
181 	KASSERT(isrc->is_pic == &atpics[MASTER].at_pic,  in _atpic_eoi_master()
189  * The data sheet says no auto-EOI on slave, but it sometimes works.
196 	KASSERT(isrc->is_pic == &atpics[SLAVE].at_pic,  in _atpic_eoi_slave()
199 	outb(atpics[SLAVE].at_ioaddr, OCW2_EOI);  in _atpic_eoi_slave()
217 	 * use mixed mode.  The "accidental" use could otherwise occur on  in atpic_register_sources()
222 	 * IRQ0 via mixed mode, but now we don't use mixed mode at all.  in atpic_register_sources()
224 	 * To avoid the slave not register sources after the master  in atpic_register_sources()
238 		intr_register_source(&ai->at_intsrc);  in atpic_register_sources()
246 	struct atpic *ap = (struct atpic *)isrc->is_pic;  in atpic_enable_source()
249 	if (ap->at_imen & IMEN_MASK(ai)) {  in atpic_enable_source()
250 		ap->at_imen &= ~IMEN_MASK(ai);  in atpic_enable_source()
251 		outb(ap->at_ioaddr + ICU_IMR_OFFSET, ap->at_imen);  in atpic_enable_source()
260 	struct atpic *ap = (struct atpic *)isrc->is_pic;  in atpic_disable_source()
263 	if (ai->at_trigger != INTR_TRIGGER_EDGE) {  in atpic_disable_source()
264 		ap->at_imen |= IMEN_MASK(ai);  in atpic_disable_source()
265 		outb(ap->at_ioaddr + ICU_IMR_OFFSET, ap->at_imen);  in atpic_disable_source()
274 		if (isrc->is_pic == &atpics[MASTER].at_pic)  in atpic_disable_source()
317 	struct atpic *ap = (struct atpic *)isrc->is_pic;  in atpic_vector()
326 	struct atpic *ap = (struct atpic *)isrc->is_pic;  in atpic_source_pending()
328 	return (inb(ap->at_ioaddr) & IMEN_MASK(ai));  in atpic_source_pending()
336 	i8259_init(ap, ap == &atpics[SLAVE]);  in atpic_resume()
337 	if (ap == &atpics[SLAVE] && elcr_found)  in atpic_resume()
364 	if (ai->at_trigger == trig)  in atpic_config_intr()
392 	ai->at_trigger = trig;  in atpic_config_intr()
409 i8259_init(struct atpic *pic, int slave)  in i8259_init()  argument
415 	outb(pic->at_ioaddr, ICW1_RESET | ICW1_IC4);  in i8259_init()
416 	imr_addr = pic->at_ioaddr + ICU_IMR_OFFSET;  in i8259_init()
419 	outb(imr_addr, pic->at_intbase);  in i8259_init()
422 	 * Setup slave links.  For the master pic, indicate what line  in i8259_init()
423 	 * the slave is configured on.  For the slave indicate  in i8259_init()
426 	if (slave)  in i8259_init()
431 	/* Set mode. */  in i8259_init()
432 	if (slave)  in i8259_init()
438 	outb(imr_addr, pic->at_imen);  in i8259_init()
441 	outb(pic->at_ioaddr, OCW3_SEL | OCW3_RR);  in i8259_init()
443 	/* OCW2_L1 sets priority order to 3-7, 0-2 (com2 first). */  in i8259_init()
444 	if (!slave)  in i8259_init()
445 		outb(pic->at_ioaddr, OCW2_R | OCW2_SL | OCW2_L1);  in i8259_init()
458 	i8259_init(&atpics[SLAVE], 1);  in atpic_startup()
461 	/* Install low-level interrupt handlers for all of our IRQs. */  in atpic_startup()
465 		ai->at_intsrc.is_count = &ai->at_count;  in atpic_startup()
466 		ai->at_intsrc.is_straycount = &ai->at_straycount;  in atpic_startup()
467 		setidt(((struct atpic *)ai->at_intsrc.is_pic)->at_intbase +  in atpic_startup()
468 		    ai->at_irq, pti ? ai->at_intr_pti : ai->at_intr, SDT_ATPIC,  in atpic_startup()
485 			ai->at_trigger = elcr_read_trigger(i);  in atpic_startup()
494 				ai->at_trigger = INTR_TRIGGER_EDGE;  in atpic_startup()
497 				ai->at_trigger = INTR_TRIGGER_LEVEL;  in atpic_startup()
536 	if (isrc->is_event == NULL && (vector == 7 || vector == 15)) {  in atpic_handle_intr()
543 		port = ((struct atpic *)isrc->is_pic)->at_ioaddr;  in atpic_handle_intr()