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i8259_common.c revision 1.2.12.1 
      1 /* $NetBSD: i8259_common.c,v 1.2.12.1 2007/12/13 05:05:21 yamt 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: i8259_common.c,v 1.2.12.1 2007/12/13 05:05:21 yamt Exp $");
     41 
     42 #include <sys/param.h>
     43 #include <sys/malloc.h>
     44 #include <sys/kernel.h>
     45 
     46 #include <uvm/uvm_extern.h>
     47 
     48 #include <machine/pio.h>
     49 #include <machine/intr.h>
     50 
     51 #include <arch/powerpc/pic/picvar.h>
     52 
     53 #include <dev/isa/isareg.h>
     54 #include <dev/isa/isavar.h>
     55 
     56 void
     57 i8259_initialize(void)
     58 {
     59 	isa_outb(IO_ICU1, 0x11);		/* program device, four bytes */
     60 	isa_outb(IO_ICU1+1, 0);			/* starting at this vector */
     61 	isa_outb(IO_ICU1+1, 1 << IRQ_SLAVE);	/* slave on line 2 */
     62 	isa_outb(IO_ICU1+1, 1);			/* 8086 mode */
     63 	isa_outb(IO_ICU1+1, 0xff);		/* leave interrupts masked */
     64 
     65 	isa_outb(IO_ICU2, 0x11);		/* program device, four bytes */
     66 	isa_outb(IO_ICU2+1, 8);			/* starting at this vector */
     67 	isa_outb(IO_ICU2+1, IRQ_SLAVE);
     68 	isa_outb(IO_ICU2+1, 1);			/* 8086 mode */
     69 	isa_outb(IO_ICU2+1, 0xff);		/* leave interrupts masked */
     70 }
     71 
     72 void
     73 i8259_enable_irq(struct pic_ops *pic, int irq, int type)
     74 {
     75 	struct i8259_ops *i8259 = (struct i8259_ops *)pic;
     76 
     77 	i8259->irqs |= 1 << irq;
     78 	if (i8259->irqs >= 0x100) /* IRQS >= 8 in use? */
     79 		i8259->irqs |= 1 << IRQ_SLAVE;
     80 
     81 	i8259->enable_mask = ~i8259->irqs;
     82 	isa_outb(IO_ICU1+1, i8259->enable_mask);
     83 	isa_outb(IO_ICU2+1, i8259->enable_mask >> 8);
     84 }
     85 
     86 void
     87 i8259_disable_irq(struct pic_ops *pic, int irq)
     88 {
     89 	struct i8259_ops *i8259 = (struct i8259_ops *)pic;
     90 	uint32_t mask = 1 << irq;
     91 
     92 	i8259->enable_mask |= mask;
     93 	isa_outb(IO_ICU1+1, i8259->enable_mask);
     94 	isa_outb(IO_ICU2+1, i8259->enable_mask >> 8);
     95 }
     96 
     97 void
     98 i8259_ack_irq(struct pic_ops *pic, int irq)
     99 {
    100 	if (irq < 8) {
    101 		isa_outb(IO_ICU1, 0xe0 | irq);
    102 	} else {
    103 		isa_outb(IO_ICU2, 0xe0 | (irq & 7));
    104 		isa_outb(IO_ICU1, 0xe0 | IRQ_SLAVE);
    105 	}
    106 }
    107 
    108 int
    109 i8259_get_irq(struct pic_ops *pic, int mode)
    110 {
    111 	int irq;
    112 
    113 	isa_outb(IO_ICU1, 0x0c);
    114 	irq = isa_inb(IO_ICU1) & 0x07;
    115 	if (irq == IRQ_SLAVE) {
    116 		isa_outb(IO_ICU2, 0x0c);
    117 		irq = (isa_inb(IO_ICU2) & 0x07) + 8;
    118 	}
    119 
    120 	if (irq == 0 && mode == PIC_GET_IRQ)
    121 		return 255;
    122 	if (irq == 7 && mode == PIC_GET_RECHECK)
    123 		return 255;
    124 
    125 	return irq;
    126 }
    127