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      1 /* $NetBSD: i8259_common.c,v 1.7 2012/02/01 09:54:03 matt Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tim Rightnour
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: i8259_common.c,v 1.7 2012/02/01 09:54:03 matt Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/kernel.h>
     37 #include <sys/intr.h>
     38 
     39 #include <uvm/uvm_extern.h>
     40 
     41 #include <machine/pio.h>
     42 
     43 #include <powerpc/pic/picvar.h>
     44 
     45 #include <dev/isa/isareg.h>
     46 #include <dev/isa/isavar.h>
     47 
     48 void
     49 i8259_initialize(void)
     50 {
     51 	isa_outb(IO_ICU1, 0x11);		/* program device, four bytes */
     52 	isa_outb(IO_ICU1+1, 0);			/* starting at this vector */
     53 	isa_outb(IO_ICU1+1, 1 << IRQ_SLAVE);	/* slave on line 2 */
     54 	isa_outb(IO_ICU1+1, 1);			/* 8086 mode */
     55 	isa_outb(IO_ICU1+1, 0xff);		/* leave interrupts masked */
     56 
     57 	isa_outb(IO_ICU2, 0x11);		/* program device, four bytes */
     58 	isa_outb(IO_ICU2+1, 8);			/* starting at this vector */
     59 	isa_outb(IO_ICU2+1, IRQ_SLAVE);
     60 	isa_outb(IO_ICU2+1, 1);			/* 8086 mode */
     61 	isa_outb(IO_ICU2+1, 0xff);		/* leave interrupts masked */
     62 }
     63 
     64 void
     65 i8259_enable_irq(struct pic_ops *pic, int irq, int type)
     66 {
     67 	struct i8259_ops *i8259 = (struct i8259_ops *)pic;
     68 
     69 	i8259->irqs |= 1 << irq;
     70 	if (i8259->irqs >= 0x100) /* IRQS >= 8 in use? */
     71 		i8259->irqs |= 1 << IRQ_SLAVE;
     72 
     73 	i8259->enable_mask = ~i8259->irqs;
     74 	isa_outb(IO_ICU1+1, i8259->enable_mask);
     75 	isa_outb(IO_ICU2+1, i8259->enable_mask >> 8);
     76 }
     77 
     78 void
     79 i8259_disable_irq(struct pic_ops *pic, int irq)
     80 {
     81 	struct i8259_ops *i8259 = (struct i8259_ops *)pic;
     82 	uint32_t mask = 1 << irq;
     83 
     84 	i8259->enable_mask |= mask;
     85 	isa_outb(IO_ICU1+1, i8259->enable_mask);
     86 	isa_outb(IO_ICU2+1, i8259->enable_mask >> 8);
     87 }
     88 
     89 void
     90 i8259_ack_irq(struct pic_ops *pic, int irq)
     91 {
     92 	if (irq < 8) {
     93 		isa_outb(IO_ICU1, 0xe0 | irq);
     94 	} else {
     95 		isa_outb(IO_ICU2, 0xe0 | (irq & 7));
     96 		isa_outb(IO_ICU1, 0xe0 | IRQ_SLAVE);
     97 	}
     98 }
     99 
    100 int
    101 i8259_get_irq(struct pic_ops *pic, int mode)
    102 {
    103 	int irq;
    104 
    105 	isa_outb(IO_ICU1, 0x0c);
    106 	irq = isa_inb(IO_ICU1) & 0x07;
    107 	if (irq == IRQ_SLAVE) {
    108 		isa_outb(IO_ICU2, 0x0c);
    109 		irq = (isa_inb(IO_ICU2) & 0x07) + 8;
    110 	}
    111 
    112 	if (irq == 0 && mode == PIC_GET_IRQ)
    113 		return 255;
    114 	if (irq == 7 && mode == PIC_GET_RECHECK)
    115 		return 255;
    116 
    117 	return irq;
    118 }
    119