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i8259_common.c revision 1.5 
      1 /* $NetBSD: i8259_common.c,v 1.5 2011/06/18 06:41:43 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 1.5 2011/06/18 06:41:43 matt Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/malloc.h>
     37 #include <sys/kernel.h>
     38 #include <sys/intr.h>
     39 
     40 #include <uvm/uvm_extern.h>
     41 
     42 #include <machine/pio.h>
     43 
     44 #include <arch/powerpc/pic/picvar.h>
     45 
     46 #include <dev/isa/isareg.h>
     47 #include <dev/isa/isavar.h>
     48 
     49 void
     50 i8259_initialize(void)
     51 {
     52 	isa_outb(IO_ICU1, 0x11);		/* program device, four bytes */
     53 	isa_outb(IO_ICU1+1, 0);			/* starting at this vector */
     54 	isa_outb(IO_ICU1+1, 1 << IRQ_SLAVE);	/* slave on line 2 */
     55 	isa_outb(IO_ICU1+1, 1);			/* 8086 mode */
     56 	isa_outb(IO_ICU1+1, 0xff);		/* leave interrupts masked */
     57 
     58 	isa_outb(IO_ICU2, 0x11);		/* program device, four bytes */
     59 	isa_outb(IO_ICU2+1, 8);			/* starting at this vector */
     60 	isa_outb(IO_ICU2+1, IRQ_SLAVE);
     61 	isa_outb(IO_ICU2+1, 1);			/* 8086 mode */
     62 	isa_outb(IO_ICU2+1, 0xff);		/* leave interrupts masked */
     63 }
     64 
     65 void
     66 i8259_enable_irq(struct pic_ops *pic, int irq, int type)
     67 {
     68 	struct i8259_ops *i8259 = (struct i8259_ops *)pic;
     69 
     70 	i8259->irqs |= 1 << irq;
     71 	if (i8259->irqs >= 0x100) /* IRQS >= 8 in use? */
     72 		i8259->irqs |= 1 << IRQ_SLAVE;
     73 
     74 	i8259->enable_mask = ~i8259->irqs;
     75 	isa_outb(IO_ICU1+1, i8259->enable_mask);
     76 	isa_outb(IO_ICU2+1, i8259->enable_mask >> 8);
     77 }
     78 
     79 void
     80 i8259_disable_irq(struct pic_ops *pic, int irq)
     81 {
     82 	struct i8259_ops *i8259 = (struct i8259_ops *)pic;
     83 	uint32_t mask = 1 << irq;
     84 
     85 	i8259->enable_mask |= mask;
     86 	isa_outb(IO_ICU1+1, i8259->enable_mask);
     87 	isa_outb(IO_ICU2+1, i8259->enable_mask >> 8);
     88 }
     89 
     90 void
     91 i8259_ack_irq(struct pic_ops *pic, int irq)
     92 {
     93 	if (irq < 8) {
     94 		isa_outb(IO_ICU1, 0xe0 | irq);
     95 	} else {
     96 		isa_outb(IO_ICU2, 0xe0 | (irq & 7));
     97 		isa_outb(IO_ICU1, 0xe0 | IRQ_SLAVE);
     98 	}
     99 }
    100 
    101 int
    102 i8259_get_irq(struct pic_ops *pic, int mode)
    103 {
    104 	int irq;
    105 
    106 	isa_outb(IO_ICU1, 0x0c);
    107 	irq = isa_inb(IO_ICU1) & 0x07;
    108 	if (irq == IRQ_SLAVE) {
    109 		isa_outb(IO_ICU2, 0x0c);
    110 		irq = (isa_inb(IO_ICU2) & 0x07) + 8;
    111 	}
    112 
    113 	if (irq == 0 && mode == PIC_GET_IRQ)
    114 		return 255;
    115 	if (irq == 7 && mode == PIC_GET_RECHECK)
    116 		return 255;
    117 
    118 	return irq;
    119 }
    120